Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1 | /* |
| 2 | * ring buffer based function tracer |
| 3 | * |
| 4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> |
| 5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> |
| 6 | * |
| 7 | * Originally taken from the RT patch by: |
| 8 | * Arnaldo Carvalho de Melo <acme@redhat.com> |
| 9 | * |
| 10 | * Based on code from the latency_tracer, that is: |
| 11 | * Copyright (C) 2004-2006 Ingo Molnar |
| 12 | * Copyright (C) 2004 William Lee Irwin III |
| 13 | */ |
| 14 | #include <linux/utsrelease.h> |
| 15 | #include <linux/kallsyms.h> |
| 16 | #include <linux/seq_file.h> |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 17 | #include <linux/notifier.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 18 | #include <linux/debugfs.h> |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 19 | #include <linux/pagemap.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 20 | #include <linux/hardirq.h> |
| 21 | #include <linux/linkage.h> |
| 22 | #include <linux/uaccess.h> |
| 23 | #include <linux/ftrace.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/percpu.h> |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 26 | #include <linux/kdebug.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 27 | #include <linux/ctype.h> |
| 28 | #include <linux/init.h> |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 29 | #include <linux/poll.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 30 | #include <linux/gfp.h> |
| 31 | #include <linux/fs.h> |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 32 | #include <linux/kprobes.h> |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 33 | #include <linux/writeback.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 34 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 35 | #include <linux/stacktrace.h> |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 36 | #include <linux/ring_buffer.h> |
Frederic Weisbecker | 21798a8 | 2008-10-28 09:43:26 +0100 | [diff] [blame] | 37 | #include <linux/irqflags.h> |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 38 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 39 | #include "trace.h" |
| 40 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 41 | #define TRACE_BUFFER_FLAGS (RB_FL_OVERWRITE) |
| 42 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 43 | unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX; |
| 44 | unsigned long __read_mostly tracing_thresh; |
| 45 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 46 | static DEFINE_PER_CPU(local_t, ftrace_cpu_disabled); |
| 47 | |
| 48 | static inline void ftrace_disable_cpu(void) |
| 49 | { |
| 50 | preempt_disable(); |
| 51 | local_inc(&__get_cpu_var(ftrace_cpu_disabled)); |
| 52 | } |
| 53 | |
| 54 | static inline void ftrace_enable_cpu(void) |
| 55 | { |
| 56 | local_dec(&__get_cpu_var(ftrace_cpu_disabled)); |
| 57 | preempt_enable(); |
| 58 | } |
| 59 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 60 | static cpumask_t __read_mostly tracing_buffer_mask; |
| 61 | |
| 62 | #define for_each_tracing_cpu(cpu) \ |
| 63 | for_each_cpu_mask(cpu, tracing_buffer_mask) |
| 64 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 65 | static int tracing_disabled = 1; |
| 66 | |
Steven Rostedt | 944ac42 | 2008-10-23 19:26:08 -0400 | [diff] [blame] | 67 | /* |
| 68 | * ftrace_dump_on_oops - variable to dump ftrace buffer on oops |
| 69 | * |
| 70 | * If there is an oops (or kernel panic) and the ftrace_dump_on_oops |
| 71 | * is set, then ftrace_dump is called. This will output the contents |
| 72 | * of the ftrace buffers to the console. This is very useful for |
| 73 | * capturing traces that lead to crashes and outputing it to a |
| 74 | * serial console. |
| 75 | * |
| 76 | * It is default off, but you can enable it with either specifying |
| 77 | * "ftrace_dump_on_oops" in the kernel command line, or setting |
| 78 | * /proc/sys/kernel/ftrace_dump_on_oops to true. |
| 79 | */ |
| 80 | int ftrace_dump_on_oops; |
| 81 | |
Peter Zijlstra | d9e5407 | 2008-11-01 19:57:37 +0100 | [diff] [blame^] | 82 | static int tracing_set_tracer(char *buf); |
| 83 | |
| 84 | static int __init set_ftrace(char *str) |
| 85 | { |
| 86 | tracing_set_tracer(str); |
| 87 | return 1; |
| 88 | } |
| 89 | __setup("ftrace", set_ftrace); |
| 90 | |
Steven Rostedt | 944ac42 | 2008-10-23 19:26:08 -0400 | [diff] [blame] | 91 | static int __init set_ftrace_dump_on_oops(char *str) |
| 92 | { |
| 93 | ftrace_dump_on_oops = 1; |
| 94 | return 1; |
| 95 | } |
| 96 | __setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops); |
| 97 | |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 98 | long |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 99 | ns2usecs(cycle_t nsec) |
| 100 | { |
| 101 | nsec += 500; |
| 102 | do_div(nsec, 1000); |
| 103 | return nsec; |
| 104 | } |
| 105 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 106 | cycle_t ftrace_now(int cpu) |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 107 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 108 | u64 ts = ring_buffer_time_stamp(cpu); |
| 109 | ring_buffer_normalize_time_stamp(cpu, &ts); |
| 110 | return ts; |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 111 | } |
| 112 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 113 | /* |
| 114 | * The global_trace is the descriptor that holds the tracing |
| 115 | * buffers for the live tracing. For each CPU, it contains |
| 116 | * a link list of pages that will store trace entries. The |
| 117 | * page descriptor of the pages in the memory is used to hold |
| 118 | * the link list by linking the lru item in the page descriptor |
| 119 | * to each of the pages in the buffer per CPU. |
| 120 | * |
| 121 | * For each active CPU there is a data field that holds the |
| 122 | * pages for the buffer for that CPU. Each CPU has the same number |
| 123 | * of pages allocated for its buffer. |
| 124 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 125 | static struct trace_array global_trace; |
| 126 | |
| 127 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); |
| 128 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 129 | /* |
| 130 | * The max_tr is used to snapshot the global_trace when a maximum |
| 131 | * latency is reached. Some tracers will use this to store a maximum |
| 132 | * trace while it continues examining live traces. |
| 133 | * |
| 134 | * The buffers for the max_tr are set up the same as the global_trace. |
| 135 | * When a snapshot is taken, the link list of the max_tr is swapped |
| 136 | * with the link list of the global_trace and the buffers are reset for |
| 137 | * the global_trace so the tracing can continue. |
| 138 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 139 | static struct trace_array max_tr; |
| 140 | |
| 141 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); |
| 142 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 143 | /* tracer_enabled is used to toggle activation of a tracer */ |
Steven Rostedt | 26994ea | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 144 | static int tracer_enabled = 1; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 145 | |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 146 | /* function tracing enabled */ |
| 147 | int ftrace_function_enabled; |
| 148 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 149 | /* |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 150 | * trace_buf_size is the size in bytes that is allocated |
| 151 | * for a buffer. Note, the number of bytes is always rounded |
| 152 | * to page size. |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 153 | * |
| 154 | * This number is purposely set to a low number of 16384. |
| 155 | * If the dump on oops happens, it will be much appreciated |
| 156 | * to not have to wait for all that output. Anyway this can be |
| 157 | * boot time and run time configurable. |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 158 | */ |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 159 | #define TRACE_BUF_SIZE_DEFAULT 1441792UL /* 16384 * 88 (sizeof(entry)) */ |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 160 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 161 | static unsigned long trace_buf_size = TRACE_BUF_SIZE_DEFAULT; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 162 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 163 | /* trace_types holds a link list of available tracers. */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 164 | static struct tracer *trace_types __read_mostly; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 165 | |
| 166 | /* current_trace points to the tracer that is currently active */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 167 | static struct tracer *current_trace __read_mostly; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 168 | |
| 169 | /* |
| 170 | * max_tracer_type_len is used to simplify the allocating of |
| 171 | * buffers to read userspace tracer names. We keep track of |
| 172 | * the longest tracer name registered. |
| 173 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 174 | static int max_tracer_type_len; |
| 175 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 176 | /* |
| 177 | * trace_types_lock is used to protect the trace_types list. |
| 178 | * This lock is also used to keep user access serialized. |
| 179 | * Accesses from userspace will grab this lock while userspace |
| 180 | * activities happen inside the kernel. |
| 181 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 182 | static DEFINE_MUTEX(trace_types_lock); |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 183 | |
| 184 | /* trace_wait is a waitqueue for tasks blocked on trace_poll */ |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 185 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
| 186 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 187 | /* trace_flags holds iter_ctrl options */ |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 188 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT; |
| 189 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 190 | /** |
| 191 | * trace_wake_up - wake up tasks waiting for trace input |
| 192 | * |
| 193 | * Simply wakes up any task that is blocked on the trace_wait |
| 194 | * queue. These is used with trace_poll for tasks polling the trace. |
| 195 | */ |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 196 | void trace_wake_up(void) |
| 197 | { |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 198 | /* |
| 199 | * The runqueue_is_locked() can fail, but this is the best we |
| 200 | * have for now: |
| 201 | */ |
| 202 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 203 | wake_up(&trace_wait); |
| 204 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 205 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 206 | static int __init set_buf_size(char *str) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 207 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 208 | unsigned long buf_size; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 209 | int ret; |
| 210 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 211 | if (!str) |
| 212 | return 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 213 | ret = strict_strtoul(str, 0, &buf_size); |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 214 | /* nr_entries can not be zero */ |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 215 | if (ret < 0 || buf_size == 0) |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 216 | return 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 217 | trace_buf_size = buf_size; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 218 | return 1; |
| 219 | } |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 220 | __setup("trace_buf_size=", set_buf_size); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 221 | |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 222 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
| 223 | { |
| 224 | return nsecs / 1000; |
| 225 | } |
| 226 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 227 | /* |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 228 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that |
| 229 | * control the output of kernel symbols. |
| 230 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 231 | #define TRACE_ITER_SYM_MASK \ |
| 232 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) |
| 233 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 234 | /* These must match the bit postions in trace_iterator_flags */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 235 | static const char *trace_options[] = { |
| 236 | "print-parent", |
| 237 | "sym-offset", |
| 238 | "sym-addr", |
| 239 | "verbose", |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 240 | "raw", |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 241 | "hex", |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 242 | "bin", |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 243 | "block", |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 244 | "stacktrace", |
Ingo Molnar | 4ac3ba4 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 245 | "sched-tree", |
Peter Zijlstra | f09ce57 | 2008-09-04 10:24:14 +0200 | [diff] [blame] | 246 | "ftrace_printk", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 247 | NULL |
| 248 | }; |
| 249 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 250 | /* |
| 251 | * ftrace_max_lock is used to protect the swapping of buffers |
| 252 | * when taking a max snapshot. The buffers themselves are |
| 253 | * protected by per_cpu spinlocks. But the action of the swap |
| 254 | * needs its own lock. |
| 255 | * |
| 256 | * This is defined as a raw_spinlock_t in order to help |
| 257 | * with performance when lockdep debugging is enabled. |
| 258 | */ |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 259 | static raw_spinlock_t ftrace_max_lock = |
| 260 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 261 | |
| 262 | /* |
| 263 | * Copy the new maximum trace into the separate maximum-trace |
| 264 | * structure. (this way the maximum trace is permanently saved, |
| 265 | * for later retrieval via /debugfs/tracing/latency_trace) |
| 266 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 267 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 268 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 269 | { |
| 270 | struct trace_array_cpu *data = tr->data[cpu]; |
| 271 | |
| 272 | max_tr.cpu = cpu; |
| 273 | max_tr.time_start = data->preempt_timestamp; |
| 274 | |
| 275 | data = max_tr.data[cpu]; |
| 276 | data->saved_latency = tracing_max_latency; |
| 277 | |
| 278 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); |
| 279 | data->pid = tsk->pid; |
| 280 | data->uid = tsk->uid; |
| 281 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; |
| 282 | data->policy = tsk->policy; |
| 283 | data->rt_priority = tsk->rt_priority; |
| 284 | |
| 285 | /* record this tasks comm */ |
| 286 | tracing_record_cmdline(current); |
| 287 | } |
| 288 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 289 | /** |
| 290 | * trace_seq_printf - sequence printing of trace information |
| 291 | * @s: trace sequence descriptor |
| 292 | * @fmt: printf format string |
| 293 | * |
| 294 | * The tracer may use either sequence operations or its own |
| 295 | * copy to user routines. To simplify formating of a trace |
| 296 | * trace_seq_printf is used to store strings into a special |
| 297 | * buffer (@s). Then the output may be either used by |
| 298 | * the sequencer or pulled into another buffer. |
| 299 | */ |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 300 | int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 301 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
| 302 | { |
| 303 | int len = (PAGE_SIZE - 1) - s->len; |
| 304 | va_list ap; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 305 | int ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 306 | |
| 307 | if (!len) |
| 308 | return 0; |
| 309 | |
| 310 | va_start(ap, fmt); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 311 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 312 | va_end(ap); |
| 313 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 314 | /* If we can't write it all, don't bother writing anything */ |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 315 | if (ret >= len) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 316 | return 0; |
| 317 | |
| 318 | s->len += ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 319 | |
| 320 | return len; |
| 321 | } |
| 322 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 323 | /** |
| 324 | * trace_seq_puts - trace sequence printing of simple string |
| 325 | * @s: trace sequence descriptor |
| 326 | * @str: simple string to record |
| 327 | * |
| 328 | * The tracer may use either the sequence operations or its own |
| 329 | * copy to user routines. This function records a simple string |
| 330 | * into a special buffer (@s) for later retrieval by a sequencer |
| 331 | * or other mechanism. |
| 332 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 333 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 334 | trace_seq_puts(struct trace_seq *s, const char *str) |
| 335 | { |
| 336 | int len = strlen(str); |
| 337 | |
| 338 | if (len > ((PAGE_SIZE - 1) - s->len)) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 339 | return 0; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 340 | |
| 341 | memcpy(s->buffer + s->len, str, len); |
| 342 | s->len += len; |
| 343 | |
| 344 | return len; |
| 345 | } |
| 346 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 347 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 348 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
| 349 | { |
| 350 | if (s->len >= (PAGE_SIZE - 1)) |
| 351 | return 0; |
| 352 | |
| 353 | s->buffer[s->len++] = c; |
| 354 | |
| 355 | return 1; |
| 356 | } |
| 357 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 358 | static int |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 359 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
| 360 | { |
| 361 | if (len > ((PAGE_SIZE - 1) - s->len)) |
| 362 | return 0; |
| 363 | |
| 364 | memcpy(s->buffer + s->len, mem, len); |
| 365 | s->len += len; |
| 366 | |
| 367 | return len; |
| 368 | } |
| 369 | |
Harvey Harrison | ad0a3b6 | 2008-10-08 17:44:55 -0700 | [diff] [blame] | 370 | #define MAX_MEMHEX_BYTES 8 |
| 371 | #define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1) |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 372 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 373 | static int |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 374 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
| 375 | { |
| 376 | unsigned char hex[HEX_CHARS]; |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 377 | unsigned char *data = mem; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 378 | int i, j; |
| 379 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 380 | #ifdef __BIG_ENDIAN |
| 381 | for (i = 0, j = 0; i < len; i++) { |
| 382 | #else |
| 383 | for (i = len-1, j = 0; i >= 0; i--) { |
| 384 | #endif |
Harvey Harrison | 2fbc474 | 2008-10-08 16:51:49 -0700 | [diff] [blame] | 385 | hex[j++] = hex_asc_hi(data[i]); |
| 386 | hex[j++] = hex_asc_lo(data[i]); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 387 | } |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 388 | hex[j++] = ' '; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 389 | |
| 390 | return trace_seq_putmem(s, hex, j); |
| 391 | } |
| 392 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 393 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 394 | trace_seq_reset(struct trace_seq *s) |
| 395 | { |
| 396 | s->len = 0; |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 397 | s->readpos = 0; |
| 398 | } |
| 399 | |
| 400 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) |
| 401 | { |
| 402 | int len; |
| 403 | int ret; |
| 404 | |
| 405 | if (s->len <= s->readpos) |
| 406 | return -EBUSY; |
| 407 | |
| 408 | len = s->len - s->readpos; |
| 409 | if (cnt > len) |
| 410 | cnt = len; |
| 411 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); |
| 412 | if (ret) |
| 413 | return -EFAULT; |
| 414 | |
| 415 | s->readpos += len; |
| 416 | return cnt; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 417 | } |
| 418 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 419 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 420 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
| 421 | { |
| 422 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; |
| 423 | |
| 424 | s->buffer[len] = 0; |
| 425 | seq_puts(m, s->buffer); |
| 426 | |
| 427 | trace_seq_reset(s); |
| 428 | } |
| 429 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 430 | /** |
| 431 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr |
| 432 | * @tr: tracer |
| 433 | * @tsk: the task with the latency |
| 434 | * @cpu: The cpu that initiated the trace. |
| 435 | * |
| 436 | * Flip the buffers between the @tr and the max_tr and record information |
| 437 | * about which task was the cause of this latency. |
| 438 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 439 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 440 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 441 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 442 | struct ring_buffer *buf = tr->buffer; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 443 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 444 | WARN_ON_ONCE(!irqs_disabled()); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 445 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 446 | |
| 447 | tr->buffer = max_tr.buffer; |
| 448 | max_tr.buffer = buf; |
| 449 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 450 | ftrace_disable_cpu(); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 451 | ring_buffer_reset(tr->buffer); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 452 | ftrace_enable_cpu(); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 453 | |
| 454 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 455 | __raw_spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 456 | } |
| 457 | |
| 458 | /** |
| 459 | * update_max_tr_single - only copy one trace over, and reset the rest |
| 460 | * @tr - tracer |
| 461 | * @tsk - task with the latency |
| 462 | * @cpu - the cpu of the buffer to copy. |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 463 | * |
| 464 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 465 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 466 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 467 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 468 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 469 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 470 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 471 | WARN_ON_ONCE(!irqs_disabled()); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 472 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 473 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 474 | ftrace_disable_cpu(); |
| 475 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 476 | ring_buffer_reset(max_tr.buffer); |
| 477 | ret = ring_buffer_swap_cpu(max_tr.buffer, tr->buffer, cpu); |
| 478 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 479 | ftrace_enable_cpu(); |
| 480 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 481 | WARN_ON_ONCE(ret); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 482 | |
| 483 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 484 | __raw_spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 485 | } |
| 486 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 487 | /** |
| 488 | * register_tracer - register a tracer with the ftrace system. |
| 489 | * @type - the plugin for the tracer |
| 490 | * |
| 491 | * Register a new plugin tracer. |
| 492 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 493 | int register_tracer(struct tracer *type) |
| 494 | { |
| 495 | struct tracer *t; |
| 496 | int len; |
| 497 | int ret = 0; |
| 498 | |
| 499 | if (!type->name) { |
| 500 | pr_info("Tracer must have a name\n"); |
| 501 | return -1; |
| 502 | } |
| 503 | |
| 504 | mutex_lock(&trace_types_lock); |
| 505 | for (t = trace_types; t; t = t->next) { |
| 506 | if (strcmp(type->name, t->name) == 0) { |
| 507 | /* already found */ |
| 508 | pr_info("Trace %s already registered\n", |
| 509 | type->name); |
| 510 | ret = -1; |
| 511 | goto out; |
| 512 | } |
| 513 | } |
| 514 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 515 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 516 | if (type->selftest) { |
| 517 | struct tracer *saved_tracer = current_trace; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 518 | struct trace_array *tr = &global_trace; |
| 519 | int saved_ctrl = tr->ctrl; |
| 520 | int i; |
| 521 | /* |
| 522 | * Run a selftest on this tracer. |
| 523 | * Here we reset the trace buffer, and set the current |
| 524 | * tracer to be this tracer. The tracer can then run some |
| 525 | * internal tracing to verify that everything is in order. |
| 526 | * If we fail, we do not register this tracer. |
| 527 | */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 528 | for_each_tracing_cpu(i) { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 529 | tracing_reset(tr, i); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 530 | } |
| 531 | current_trace = type; |
| 532 | tr->ctrl = 0; |
| 533 | /* the test is responsible for initializing and enabling */ |
| 534 | pr_info("Testing tracer %s: ", type->name); |
| 535 | ret = type->selftest(type, tr); |
| 536 | /* the test is responsible for resetting too */ |
| 537 | current_trace = saved_tracer; |
| 538 | tr->ctrl = saved_ctrl; |
| 539 | if (ret) { |
| 540 | printk(KERN_CONT "FAILED!\n"); |
| 541 | goto out; |
| 542 | } |
Steven Rostedt | 1d4db00 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 543 | /* Only reset on passing, to avoid touching corrupted buffers */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 544 | for_each_tracing_cpu(i) { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 545 | tracing_reset(tr, i); |
Steven Rostedt | 1d4db00 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 546 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 547 | printk(KERN_CONT "PASSED\n"); |
| 548 | } |
| 549 | #endif |
| 550 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 551 | type->next = trace_types; |
| 552 | trace_types = type; |
| 553 | len = strlen(type->name); |
| 554 | if (len > max_tracer_type_len) |
| 555 | max_tracer_type_len = len; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 556 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 557 | out: |
| 558 | mutex_unlock(&trace_types_lock); |
| 559 | |
| 560 | return ret; |
| 561 | } |
| 562 | |
| 563 | void unregister_tracer(struct tracer *type) |
| 564 | { |
| 565 | struct tracer **t; |
| 566 | int len; |
| 567 | |
| 568 | mutex_lock(&trace_types_lock); |
| 569 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 570 | if (*t == type) |
| 571 | goto found; |
| 572 | } |
| 573 | pr_info("Trace %s not registered\n", type->name); |
| 574 | goto out; |
| 575 | |
| 576 | found: |
| 577 | *t = (*t)->next; |
| 578 | if (strlen(type->name) != max_tracer_type_len) |
| 579 | goto out; |
| 580 | |
| 581 | max_tracer_type_len = 0; |
| 582 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 583 | len = strlen((*t)->name); |
| 584 | if (len > max_tracer_type_len) |
| 585 | max_tracer_type_len = len; |
| 586 | } |
| 587 | out: |
| 588 | mutex_unlock(&trace_types_lock); |
| 589 | } |
| 590 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 591 | void tracing_reset(struct trace_array *tr, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 592 | { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 593 | ftrace_disable_cpu(); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 594 | ring_buffer_reset_cpu(tr->buffer, cpu); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 595 | ftrace_enable_cpu(); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 596 | } |
| 597 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 598 | #define SAVED_CMDLINES 128 |
| 599 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; |
| 600 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; |
| 601 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; |
| 602 | static int cmdline_idx; |
| 603 | static DEFINE_SPINLOCK(trace_cmdline_lock); |
Steven Rostedt | 25b0b44 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 604 | |
Steven Rostedt | 25b0b44 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 605 | /* temporary disable recording */ |
| 606 | atomic_t trace_record_cmdline_disabled __read_mostly; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 607 | |
| 608 | static void trace_init_cmdlines(void) |
| 609 | { |
| 610 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); |
| 611 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); |
| 612 | cmdline_idx = 0; |
| 613 | } |
| 614 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 615 | void trace_stop_cmdline_recording(void); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 616 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 617 | static void trace_save_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 618 | { |
| 619 | unsigned map; |
| 620 | unsigned idx; |
| 621 | |
| 622 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) |
| 623 | return; |
| 624 | |
| 625 | /* |
| 626 | * It's not the end of the world if we don't get |
| 627 | * the lock, but we also don't want to spin |
| 628 | * nor do we want to disable interrupts, |
| 629 | * so if we miss here, then better luck next time. |
| 630 | */ |
| 631 | if (!spin_trylock(&trace_cmdline_lock)) |
| 632 | return; |
| 633 | |
| 634 | idx = map_pid_to_cmdline[tsk->pid]; |
| 635 | if (idx >= SAVED_CMDLINES) { |
| 636 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; |
| 637 | |
| 638 | map = map_cmdline_to_pid[idx]; |
| 639 | if (map <= PID_MAX_DEFAULT) |
| 640 | map_pid_to_cmdline[map] = (unsigned)-1; |
| 641 | |
| 642 | map_pid_to_cmdline[tsk->pid] = idx; |
| 643 | |
| 644 | cmdline_idx = idx; |
| 645 | } |
| 646 | |
| 647 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); |
| 648 | |
| 649 | spin_unlock(&trace_cmdline_lock); |
| 650 | } |
| 651 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 652 | static char *trace_find_cmdline(int pid) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 653 | { |
| 654 | char *cmdline = "<...>"; |
| 655 | unsigned map; |
| 656 | |
| 657 | if (!pid) |
| 658 | return "<idle>"; |
| 659 | |
| 660 | if (pid > PID_MAX_DEFAULT) |
| 661 | goto out; |
| 662 | |
| 663 | map = map_pid_to_cmdline[pid]; |
| 664 | if (map >= SAVED_CMDLINES) |
| 665 | goto out; |
| 666 | |
| 667 | cmdline = saved_cmdlines[map]; |
| 668 | |
| 669 | out: |
| 670 | return cmdline; |
| 671 | } |
| 672 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 673 | void tracing_record_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 674 | { |
| 675 | if (atomic_read(&trace_record_cmdline_disabled)) |
| 676 | return; |
| 677 | |
| 678 | trace_save_cmdline(tsk); |
| 679 | } |
| 680 | |
Pekka Paalanen | 45dcd8b | 2008-09-16 21:56:41 +0300 | [diff] [blame] | 681 | void |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 682 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags, |
| 683 | int pc) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 684 | { |
| 685 | struct task_struct *tsk = current; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 686 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 687 | entry->preempt_count = pc & 0xff; |
| 688 | entry->pid = (tsk) ? tsk->pid : 0; |
| 689 | entry->flags = |
Steven Rostedt | 9244489 | 2008-10-24 09:42:59 -0400 | [diff] [blame] | 690 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 691 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
Steven Rostedt | 9244489 | 2008-10-24 09:42:59 -0400 | [diff] [blame] | 692 | #else |
| 693 | TRACE_FLAG_IRQS_NOSUPPORT | |
| 694 | #endif |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 695 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
| 696 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | |
| 697 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); |
| 698 | } |
| 699 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 700 | void |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 701 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 702 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
| 703 | int pc) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 704 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 705 | struct ring_buffer_event *event; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 706 | struct ftrace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 707 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 708 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 709 | /* If we are reading the ring buffer, don't trace */ |
| 710 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) |
| 711 | return; |
| 712 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 713 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 714 | &irq_flags); |
| 715 | if (!event) |
| 716 | return; |
| 717 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 718 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 719 | entry->ent.type = TRACE_FN; |
| 720 | entry->ip = ip; |
| 721 | entry->parent_ip = parent_ip; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 722 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 723 | } |
| 724 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 725 | void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 726 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 727 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
| 728 | int pc) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 729 | { |
| 730 | if (likely(!atomic_read(&data->disabled))) |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 731 | trace_function(tr, data, ip, parent_ip, flags, pc); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 732 | } |
| 733 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 734 | static void ftrace_trace_stack(struct trace_array *tr, |
| 735 | struct trace_array_cpu *data, |
| 736 | unsigned long flags, |
| 737 | int skip, int pc) |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 738 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 739 | struct ring_buffer_event *event; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 740 | struct stack_entry *entry; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 741 | struct stack_trace trace; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 742 | unsigned long irq_flags; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 743 | |
| 744 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) |
| 745 | return; |
| 746 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 747 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 748 | &irq_flags); |
| 749 | if (!event) |
| 750 | return; |
| 751 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 752 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 753 | entry->ent.type = TRACE_STACK; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 754 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 755 | memset(&entry->caller, 0, sizeof(entry->caller)); |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 756 | |
| 757 | trace.nr_entries = 0; |
| 758 | trace.max_entries = FTRACE_STACK_ENTRIES; |
| 759 | trace.skip = skip; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 760 | trace.entries = entry->caller; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 761 | |
| 762 | save_stack_trace(&trace); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 763 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 764 | } |
| 765 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 766 | void __trace_stack(struct trace_array *tr, |
| 767 | struct trace_array_cpu *data, |
| 768 | unsigned long flags, |
| 769 | int skip) |
| 770 | { |
| 771 | ftrace_trace_stack(tr, data, flags, skip, preempt_count()); |
| 772 | } |
| 773 | |
| 774 | static void |
| 775 | ftrace_trace_special(void *__tr, void *__data, |
| 776 | unsigned long arg1, unsigned long arg2, unsigned long arg3, |
| 777 | int pc) |
Ingo Molnar | a4feb83 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 778 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 779 | struct ring_buffer_event *event; |
Ingo Molnar | a4feb83 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 780 | struct trace_array_cpu *data = __data; |
| 781 | struct trace_array *tr = __tr; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 782 | struct special_entry *entry; |
Ingo Molnar | a4feb83 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 783 | unsigned long irq_flags; |
| 784 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 785 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 786 | &irq_flags); |
| 787 | if (!event) |
| 788 | return; |
| 789 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 790 | tracing_generic_entry_update(&entry->ent, 0, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 791 | entry->ent.type = TRACE_SPECIAL; |
| 792 | entry->arg1 = arg1; |
| 793 | entry->arg2 = arg2; |
| 794 | entry->arg3 = arg3; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 795 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 796 | ftrace_trace_stack(tr, data, irq_flags, 4, pc); |
Ingo Molnar | a4feb83 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 797 | |
| 798 | trace_wake_up(); |
| 799 | } |
| 800 | |
| 801 | void |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 802 | __trace_special(void *__tr, void *__data, |
| 803 | unsigned long arg1, unsigned long arg2, unsigned long arg3) |
| 804 | { |
| 805 | ftrace_trace_special(__tr, __data, arg1, arg2, arg3, preempt_count()); |
| 806 | } |
| 807 | |
| 808 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 809 | tracing_sched_switch_trace(struct trace_array *tr, |
| 810 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 811 | struct task_struct *prev, |
| 812 | struct task_struct *next, |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 813 | unsigned long flags, int pc) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 814 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 815 | struct ring_buffer_event *event; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 816 | struct ctx_switch_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 817 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 818 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 819 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 820 | &irq_flags); |
| 821 | if (!event) |
| 822 | return; |
| 823 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 824 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 825 | entry->ent.type = TRACE_CTX; |
| 826 | entry->prev_pid = prev->pid; |
| 827 | entry->prev_prio = prev->prio; |
| 828 | entry->prev_state = prev->state; |
| 829 | entry->next_pid = next->pid; |
| 830 | entry->next_prio = next->prio; |
| 831 | entry->next_state = next->state; |
| 832 | entry->next_cpu = task_cpu(next); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 833 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 834 | ftrace_trace_stack(tr, data, flags, 5, pc); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 835 | } |
| 836 | |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 837 | void |
| 838 | tracing_sched_wakeup_trace(struct trace_array *tr, |
| 839 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 840 | struct task_struct *wakee, |
| 841 | struct task_struct *curr, |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 842 | unsigned long flags, int pc) |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 843 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 844 | struct ring_buffer_event *event; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 845 | struct ctx_switch_entry *entry; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 846 | unsigned long irq_flags; |
| 847 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 848 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 849 | &irq_flags); |
| 850 | if (!event) |
| 851 | return; |
| 852 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 853 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 854 | entry->ent.type = TRACE_WAKE; |
| 855 | entry->prev_pid = curr->pid; |
| 856 | entry->prev_prio = curr->prio; |
| 857 | entry->prev_state = curr->state; |
| 858 | entry->next_pid = wakee->pid; |
| 859 | entry->next_prio = wakee->prio; |
| 860 | entry->next_state = wakee->state; |
| 861 | entry->next_cpu = task_cpu(wakee); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 862 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 863 | ftrace_trace_stack(tr, data, flags, 6, pc); |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 864 | |
| 865 | trace_wake_up(); |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 866 | } |
| 867 | |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 868 | void |
| 869 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) |
| 870 | { |
| 871 | struct trace_array *tr = &global_trace; |
| 872 | struct trace_array_cpu *data; |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 873 | int cpu; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 874 | int pc; |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 875 | |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 876 | if (tracing_disabled || !tr->ctrl) |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 877 | return; |
| 878 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 879 | pc = preempt_count(); |
| 880 | preempt_disable_notrace(); |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 881 | cpu = raw_smp_processor_id(); |
| 882 | data = tr->data[cpu]; |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 883 | |
Steven Rostedt | 3ea2e6d | 2008-10-04 02:01:00 -0400 | [diff] [blame] | 884 | if (likely(!atomic_read(&data->disabled))) |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 885 | ftrace_trace_special(tr, data, arg1, arg2, arg3, pc); |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 886 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 887 | preempt_enable_notrace(); |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 888 | } |
| 889 | |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 890 | #ifdef CONFIG_FUNCTION_TRACER |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 891 | static void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 892 | function_trace_call(unsigned long ip, unsigned long parent_ip) |
| 893 | { |
| 894 | struct trace_array *tr = &global_trace; |
| 895 | struct trace_array_cpu *data; |
| 896 | unsigned long flags; |
| 897 | long disabled; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 898 | int cpu, resched; |
| 899 | int pc; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 900 | |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 901 | if (unlikely(!ftrace_function_enabled)) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 902 | return; |
| 903 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 904 | pc = preempt_count(); |
| 905 | resched = need_resched(); |
| 906 | preempt_disable_notrace(); |
| 907 | local_save_flags(flags); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 908 | cpu = raw_smp_processor_id(); |
| 909 | data = tr->data[cpu]; |
| 910 | disabled = atomic_inc_return(&data->disabled); |
| 911 | |
| 912 | if (likely(disabled == 1)) |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 913 | trace_function(tr, data, ip, parent_ip, flags, pc); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 914 | |
| 915 | atomic_dec(&data->disabled); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 916 | if (resched) |
| 917 | preempt_enable_no_resched_notrace(); |
| 918 | else |
| 919 | preempt_enable_notrace(); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 920 | } |
| 921 | |
| 922 | static struct ftrace_ops trace_ops __read_mostly = |
| 923 | { |
| 924 | .func = function_trace_call, |
| 925 | }; |
| 926 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 927 | void tracing_start_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 928 | { |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 929 | ftrace_function_enabled = 0; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 930 | register_ftrace_function(&trace_ops); |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 931 | if (tracer_enabled) |
| 932 | ftrace_function_enabled = 1; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 933 | } |
| 934 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 935 | void tracing_stop_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 936 | { |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 937 | ftrace_function_enabled = 0; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 938 | unregister_ftrace_function(&trace_ops); |
| 939 | } |
| 940 | #endif |
| 941 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 942 | enum trace_file_type { |
| 943 | TRACE_FILE_LAT_FMT = 1, |
| 944 | }; |
| 945 | |
Steven Rostedt | 5a90f57 | 2008-09-03 17:42:51 -0400 | [diff] [blame] | 946 | static void trace_iterator_increment(struct trace_iterator *iter, int cpu) |
| 947 | { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 948 | /* Don't allow ftrace to trace into the ring buffers */ |
| 949 | ftrace_disable_cpu(); |
| 950 | |
Steven Rostedt | 5a90f57 | 2008-09-03 17:42:51 -0400 | [diff] [blame] | 951 | iter->idx++; |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 952 | if (iter->buffer_iter[iter->cpu]) |
| 953 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); |
| 954 | |
| 955 | ftrace_enable_cpu(); |
Steven Rostedt | 5a90f57 | 2008-09-03 17:42:51 -0400 | [diff] [blame] | 956 | } |
| 957 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 958 | static struct trace_entry * |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 959 | peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 960 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 961 | struct ring_buffer_event *event; |
| 962 | struct ring_buffer_iter *buf_iter = iter->buffer_iter[cpu]; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 963 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 964 | /* Don't allow ftrace to trace into the ring buffers */ |
| 965 | ftrace_disable_cpu(); |
| 966 | |
| 967 | if (buf_iter) |
| 968 | event = ring_buffer_iter_peek(buf_iter, ts); |
| 969 | else |
| 970 | event = ring_buffer_peek(iter->tr->buffer, cpu, ts); |
| 971 | |
| 972 | ftrace_enable_cpu(); |
| 973 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 974 | return event ? ring_buffer_event_data(event) : NULL; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 975 | } |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 976 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 977 | static struct trace_entry * |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 978 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 979 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 980 | struct ring_buffer *buffer = iter->tr->buffer; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 981 | struct trace_entry *ent, *next = NULL; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 982 | u64 next_ts = 0, ts; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 983 | int next_cpu = -1; |
| 984 | int cpu; |
| 985 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 986 | for_each_tracing_cpu(cpu) { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 987 | |
| 988 | if (ring_buffer_empty_cpu(buffer, cpu)) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 989 | continue; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 990 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 991 | ent = peek_next_entry(iter, cpu, &ts); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 992 | |
Ingo Molnar | cdd31cd | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 993 | /* |
| 994 | * Pick the entry with the smallest timestamp: |
| 995 | */ |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 996 | if (ent && (!next || ts < next_ts)) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 997 | next = ent; |
| 998 | next_cpu = cpu; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 999 | next_ts = ts; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1000 | } |
| 1001 | } |
| 1002 | |
| 1003 | if (ent_cpu) |
| 1004 | *ent_cpu = next_cpu; |
| 1005 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1006 | if (ent_ts) |
| 1007 | *ent_ts = next_ts; |
| 1008 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1009 | return next; |
| 1010 | } |
| 1011 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1012 | /* Find the next real entry, without updating the iterator itself */ |
| 1013 | static struct trace_entry * |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1014 | find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1015 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1016 | return __find_next_entry(iter, ent_cpu, ent_ts); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1017 | } |
Ingo Molnar | 8c523a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1018 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1019 | /* Find the next real entry, and increment the iterator to the next entry */ |
| 1020 | static void *find_next_entry_inc(struct trace_iterator *iter) |
| 1021 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1022 | iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1023 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1024 | if (iter->ent) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1025 | trace_iterator_increment(iter, iter->cpu); |
| 1026 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1027 | return iter->ent ? iter : NULL; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1028 | } |
| 1029 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1030 | static void trace_consume(struct trace_iterator *iter) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1031 | { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1032 | /* Don't allow ftrace to trace into the ring buffers */ |
| 1033 | ftrace_disable_cpu(); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1034 | ring_buffer_consume(iter->tr->buffer, iter->cpu, &iter->ts); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1035 | ftrace_enable_cpu(); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1036 | } |
| 1037 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1038 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1039 | { |
| 1040 | struct trace_iterator *iter = m->private; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1041 | int i = (int)*pos; |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1042 | void *ent; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1043 | |
| 1044 | (*pos)++; |
| 1045 | |
| 1046 | /* can't go backwards */ |
| 1047 | if (iter->idx > i) |
| 1048 | return NULL; |
| 1049 | |
| 1050 | if (iter->idx < 0) |
| 1051 | ent = find_next_entry_inc(iter); |
| 1052 | else |
| 1053 | ent = iter; |
| 1054 | |
| 1055 | while (ent && iter->idx < i) |
| 1056 | ent = find_next_entry_inc(iter); |
| 1057 | |
| 1058 | iter->pos = *pos; |
| 1059 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1060 | return ent; |
| 1061 | } |
| 1062 | |
| 1063 | static void *s_start(struct seq_file *m, loff_t *pos) |
| 1064 | { |
| 1065 | struct trace_iterator *iter = m->private; |
| 1066 | void *p = NULL; |
| 1067 | loff_t l = 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1068 | int cpu; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1069 | |
| 1070 | mutex_lock(&trace_types_lock); |
| 1071 | |
Steven Rostedt | d15f57f | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 1072 | if (!current_trace || current_trace != iter->trace) { |
| 1073 | mutex_unlock(&trace_types_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1074 | return NULL; |
Steven Rostedt | d15f57f | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 1075 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1076 | |
| 1077 | atomic_inc(&trace_record_cmdline_disabled); |
| 1078 | |
| 1079 | /* let the tracer grab locks here if needed */ |
| 1080 | if (current_trace->start) |
| 1081 | current_trace->start(iter); |
| 1082 | |
| 1083 | if (*pos != iter->pos) { |
| 1084 | iter->ent = NULL; |
| 1085 | iter->cpu = 0; |
| 1086 | iter->idx = -1; |
| 1087 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1088 | ftrace_disable_cpu(); |
| 1089 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1090 | for_each_tracing_cpu(cpu) { |
| 1091 | ring_buffer_iter_reset(iter->buffer_iter[cpu]); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1092 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1093 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1094 | ftrace_enable_cpu(); |
| 1095 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1096 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
| 1097 | ; |
| 1098 | |
| 1099 | } else { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1100 | l = *pos - 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1101 | p = s_next(m, p, &l); |
| 1102 | } |
| 1103 | |
| 1104 | return p; |
| 1105 | } |
| 1106 | |
| 1107 | static void s_stop(struct seq_file *m, void *p) |
| 1108 | { |
| 1109 | struct trace_iterator *iter = m->private; |
| 1110 | |
| 1111 | atomic_dec(&trace_record_cmdline_disabled); |
| 1112 | |
| 1113 | /* let the tracer release locks here if needed */ |
| 1114 | if (current_trace && current_trace == iter->trace && iter->trace->stop) |
| 1115 | iter->trace->stop(iter); |
| 1116 | |
| 1117 | mutex_unlock(&trace_types_lock); |
| 1118 | } |
| 1119 | |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1120 | #define KRETPROBE_MSG "[unknown/kretprobe'd]" |
| 1121 | |
| 1122 | #ifdef CONFIG_KRETPROBES |
| 1123 | static inline int kretprobed(unsigned long addr) |
| 1124 | { |
| 1125 | return addr == (unsigned long)kretprobe_trampoline; |
| 1126 | } |
| 1127 | #else |
| 1128 | static inline int kretprobed(unsigned long addr) |
| 1129 | { |
| 1130 | return 0; |
| 1131 | } |
| 1132 | #endif /* CONFIG_KRETPROBES */ |
| 1133 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1134 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1135 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1136 | { |
| 1137 | #ifdef CONFIG_KALLSYMS |
| 1138 | char str[KSYM_SYMBOL_LEN]; |
| 1139 | |
| 1140 | kallsyms_lookup(address, NULL, NULL, NULL, str); |
| 1141 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1142 | return trace_seq_printf(s, fmt, str); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1143 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1144 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1145 | } |
| 1146 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1147 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1148 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
| 1149 | unsigned long address) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1150 | { |
| 1151 | #ifdef CONFIG_KALLSYMS |
| 1152 | char str[KSYM_SYMBOL_LEN]; |
| 1153 | |
| 1154 | sprint_symbol(str, address); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1155 | return trace_seq_printf(s, fmt, str); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1156 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1157 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1158 | } |
| 1159 | |
| 1160 | #ifndef CONFIG_64BIT |
| 1161 | # define IP_FMT "%08lx" |
| 1162 | #else |
| 1163 | # define IP_FMT "%016lx" |
| 1164 | #endif |
| 1165 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1166 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1167 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1168 | { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1169 | int ret; |
| 1170 | |
| 1171 | if (!ip) |
| 1172 | return trace_seq_printf(s, "0"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1173 | |
| 1174 | if (sym_flags & TRACE_ITER_SYM_OFFSET) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1175 | ret = seq_print_sym_offset(s, "%s", ip); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1176 | else |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1177 | ret = seq_print_sym_short(s, "%s", ip); |
| 1178 | |
| 1179 | if (!ret) |
| 1180 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1181 | |
| 1182 | if (sym_flags & TRACE_ITER_SYM_ADDR) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1183 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
| 1184 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1185 | } |
| 1186 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1187 | static void print_lat_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1188 | { |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1189 | seq_puts(m, "# _------=> CPU# \n"); |
| 1190 | seq_puts(m, "# / _-----=> irqs-off \n"); |
| 1191 | seq_puts(m, "# | / _----=> need-resched \n"); |
| 1192 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); |
| 1193 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); |
| 1194 | seq_puts(m, "# |||| / \n"); |
| 1195 | seq_puts(m, "# ||||| delay \n"); |
| 1196 | seq_puts(m, "# cmd pid ||||| time | caller \n"); |
| 1197 | seq_puts(m, "# \\ / ||||| \\ | / \n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1198 | } |
| 1199 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1200 | static void print_func_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1201 | { |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1202 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
| 1203 | seq_puts(m, "# | | | | |\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1204 | } |
| 1205 | |
| 1206 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1207 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1208 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
| 1209 | { |
| 1210 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
| 1211 | struct trace_array *tr = iter->tr; |
| 1212 | struct trace_array_cpu *data = tr->data[tr->cpu]; |
| 1213 | struct tracer *type = current_trace; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1214 | unsigned long total; |
| 1215 | unsigned long entries; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1216 | const char *name = "preemption"; |
| 1217 | |
| 1218 | if (type) |
| 1219 | name = type->name; |
| 1220 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1221 | entries = ring_buffer_entries(iter->tr->buffer); |
| 1222 | total = entries + |
| 1223 | ring_buffer_overruns(iter->tr->buffer); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1224 | |
| 1225 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", |
| 1226 | name, UTS_RELEASE); |
| 1227 | seq_puts(m, "-----------------------------------" |
| 1228 | "---------------------------------\n"); |
| 1229 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" |
| 1230 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1231 | nsecs_to_usecs(data->saved_latency), |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1232 | entries, |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1233 | total, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1234 | tr->cpu, |
| 1235 | #if defined(CONFIG_PREEMPT_NONE) |
| 1236 | "server", |
| 1237 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) |
| 1238 | "desktop", |
Steven Rostedt | b5c21b4 | 2008-07-10 20:58:12 -0400 | [diff] [blame] | 1239 | #elif defined(CONFIG_PREEMPT) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1240 | "preempt", |
| 1241 | #else |
| 1242 | "unknown", |
| 1243 | #endif |
| 1244 | /* These are reserved for later use */ |
| 1245 | 0, 0, 0, 0); |
| 1246 | #ifdef CONFIG_SMP |
| 1247 | seq_printf(m, " #P:%d)\n", num_online_cpus()); |
| 1248 | #else |
| 1249 | seq_puts(m, ")\n"); |
| 1250 | #endif |
| 1251 | seq_puts(m, " -----------------\n"); |
| 1252 | seq_printf(m, " | task: %.16s-%d " |
| 1253 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", |
| 1254 | data->comm, data->pid, data->uid, data->nice, |
| 1255 | data->policy, data->rt_priority); |
| 1256 | seq_puts(m, " -----------------\n"); |
| 1257 | |
| 1258 | if (data->critical_start) { |
| 1259 | seq_puts(m, " => started at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1260 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
| 1261 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1262 | seq_puts(m, "\n => ended at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1263 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
| 1264 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1265 | seq_puts(m, "\n"); |
| 1266 | } |
| 1267 | |
| 1268 | seq_puts(m, "\n"); |
| 1269 | } |
| 1270 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1271 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1272 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1273 | { |
| 1274 | int hardirq, softirq; |
| 1275 | char *comm; |
| 1276 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1277 | comm = trace_find_cmdline(entry->pid); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1278 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1279 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1280 | trace_seq_printf(s, "%3d", cpu); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1281 | trace_seq_printf(s, "%c%c", |
Steven Rostedt | 9244489 | 2008-10-24 09:42:59 -0400 | [diff] [blame] | 1282 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : |
| 1283 | (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : '.', |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1284 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1285 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1286 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; |
| 1287 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1288 | if (hardirq && softirq) { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1289 | trace_seq_putc(s, 'H'); |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1290 | } else { |
| 1291 | if (hardirq) { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1292 | trace_seq_putc(s, 'h'); |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1293 | } else { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1294 | if (softirq) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1295 | trace_seq_putc(s, 's'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1296 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1297 | trace_seq_putc(s, '.'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1298 | } |
| 1299 | } |
| 1300 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1301 | if (entry->preempt_count) |
| 1302 | trace_seq_printf(s, "%x", entry->preempt_count); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1303 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1304 | trace_seq_puts(s, "."); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1305 | } |
| 1306 | |
| 1307 | unsigned long preempt_mark_thresh = 100; |
| 1308 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1309 | static void |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1310 | lat_print_timestamp(struct trace_seq *s, u64 abs_usecs, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1311 | unsigned long rel_usecs) |
| 1312 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1313 | trace_seq_printf(s, " %4lldus", abs_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1314 | if (rel_usecs > preempt_mark_thresh) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1315 | trace_seq_puts(s, "!: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1316 | else if (rel_usecs > 1) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1317 | trace_seq_puts(s, "+: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1318 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1319 | trace_seq_puts(s, " : "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1320 | } |
| 1321 | |
| 1322 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; |
| 1323 | |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1324 | /* |
| 1325 | * The message is supposed to contain an ending newline. |
| 1326 | * If the printing stops prematurely, try to add a newline of our own. |
| 1327 | */ |
| 1328 | void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1329 | { |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1330 | struct trace_entry *ent; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1331 | struct trace_field_cont *cont; |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1332 | bool ok = true; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1333 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1334 | ent = peek_next_entry(iter, iter->cpu, NULL); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1335 | if (!ent || ent->type != TRACE_CONT) { |
| 1336 | trace_seq_putc(s, '\n'); |
| 1337 | return; |
| 1338 | } |
| 1339 | |
| 1340 | do { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1341 | cont = (struct trace_field_cont *)ent; |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1342 | if (ok) |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1343 | ok = (trace_seq_printf(s, "%s", cont->buf) > 0); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1344 | |
| 1345 | ftrace_disable_cpu(); |
| 1346 | |
| 1347 | if (iter->buffer_iter[iter->cpu]) |
| 1348 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); |
| 1349 | else |
| 1350 | ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL); |
| 1351 | |
| 1352 | ftrace_enable_cpu(); |
| 1353 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1354 | ent = peek_next_entry(iter, iter->cpu, NULL); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1355 | } while (ent && ent->type == TRACE_CONT); |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1356 | |
| 1357 | if (!ok) |
| 1358 | trace_seq_putc(s, '\n'); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1359 | } |
| 1360 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1361 | static enum print_line_t |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1362 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1363 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1364 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1365 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1366 | struct trace_entry *next_entry; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1367 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); |
| 1368 | struct trace_entry *entry = iter->ent; |
| 1369 | unsigned long abs_usecs; |
| 1370 | unsigned long rel_usecs; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1371 | u64 next_ts; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1372 | char *comm; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1373 | int S, T; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1374 | int i; |
Ankita Garg | d17d969 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 1375 | unsigned state; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1376 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1377 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1378 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1379 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1380 | next_entry = find_next_entry(iter, NULL, &next_ts); |
| 1381 | if (!next_entry) |
| 1382 | next_ts = iter->ts; |
| 1383 | rel_usecs = ns2usecs(next_ts - iter->ts); |
| 1384 | abs_usecs = ns2usecs(iter->ts - iter->tr->time_start); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1385 | |
| 1386 | if (verbose) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1387 | comm = trace_find_cmdline(entry->pid); |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1388 | trace_seq_printf(s, "%16s %5d %3d %d %08x %08x [%08lx]" |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1389 | " %ld.%03ldms (+%ld.%03ldms): ", |
| 1390 | comm, |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1391 | entry->pid, cpu, entry->flags, |
| 1392 | entry->preempt_count, trace_idx, |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1393 | ns2usecs(iter->ts), |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1394 | abs_usecs/1000, |
| 1395 | abs_usecs % 1000, rel_usecs/1000, |
| 1396 | rel_usecs % 1000); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1397 | } else { |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1398 | lat_print_generic(s, entry, cpu); |
| 1399 | lat_print_timestamp(s, abs_usecs, rel_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1400 | } |
| 1401 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1402 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1403 | struct ftrace_entry *field; |
| 1404 | |
| 1405 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1406 | |
| 1407 | seq_print_ip_sym(s, field->ip, sym_flags); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1408 | trace_seq_puts(s, " ("); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1409 | if (kretprobed(field->parent_ip)) |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1410 | trace_seq_puts(s, KRETPROBE_MSG); |
| 1411 | else |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1412 | seq_print_ip_sym(s, field->parent_ip, sym_flags); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1413 | trace_seq_puts(s, ")\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1414 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1415 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1416 | case TRACE_CTX: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1417 | case TRACE_WAKE: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1418 | struct ctx_switch_entry *field; |
| 1419 | |
| 1420 | trace_assign_type(field, entry); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1421 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1422 | T = field->next_state < sizeof(state_to_char) ? |
| 1423 | state_to_char[field->next_state] : 'X'; |
| 1424 | |
| 1425 | state = field->prev_state ? |
| 1426 | __ffs(field->prev_state) + 1 : 0; |
Ankita Garg | d17d969 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 1427 | S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X'; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1428 | comm = trace_find_cmdline(field->next_pid); |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 1429 | trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1430 | field->prev_pid, |
| 1431 | field->prev_prio, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1432 | S, entry->type == TRACE_CTX ? "==>" : " +", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1433 | field->next_cpu, |
| 1434 | field->next_pid, |
| 1435 | field->next_prio, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1436 | T, comm); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1437 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1438 | } |
| 1439 | case TRACE_SPECIAL: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1440 | struct special_entry *field; |
| 1441 | |
| 1442 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1443 | |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1444 | trace_seq_printf(s, "# %ld %ld %ld\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1445 | field->arg1, |
| 1446 | field->arg2, |
| 1447 | field->arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1448 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1449 | } |
| 1450 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1451 | struct stack_entry *field; |
| 1452 | |
| 1453 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1454 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1455 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1456 | if (i) |
| 1457 | trace_seq_puts(s, " <= "); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1458 | seq_print_ip_sym(s, field->caller[i], sym_flags); |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1459 | } |
| 1460 | trace_seq_puts(s, "\n"); |
| 1461 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1462 | } |
| 1463 | case TRACE_PRINT: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1464 | struct print_entry *field; |
| 1465 | |
| 1466 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1467 | |
| 1468 | seq_print_ip_sym(s, field->ip, sym_flags); |
| 1469 | trace_seq_printf(s, ": %s", field->buf); |
| 1470 | if (entry->flags & TRACE_FLAG_CONT) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1471 | trace_seq_print_cont(s, iter); |
| 1472 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1473 | } |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1474 | default: |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1475 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1476 | } |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1477 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1478 | } |
| 1479 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1480 | static enum print_line_t print_trace_fmt(struct trace_iterator *iter) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1481 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1482 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1483 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1484 | struct trace_entry *entry; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1485 | unsigned long usec_rem; |
| 1486 | unsigned long long t; |
| 1487 | unsigned long secs; |
| 1488 | char *comm; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1489 | int ret; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1490 | int S, T; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1491 | int i; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1492 | |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1493 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1494 | |
| 1495 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1496 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1497 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1498 | comm = trace_find_cmdline(iter->ent->pid); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1499 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1500 | t = ns2usecs(iter->ts); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1501 | usec_rem = do_div(t, 1000000ULL); |
| 1502 | secs = (unsigned long)t; |
| 1503 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1504 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1505 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1506 | return TRACE_TYPE_PARTIAL_LINE; |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1507 | ret = trace_seq_printf(s, "[%03d] ", iter->cpu); |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1508 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1509 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1510 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); |
| 1511 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1512 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1513 | |
| 1514 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1515 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1516 | struct ftrace_entry *field; |
| 1517 | |
| 1518 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1519 | |
| 1520 | ret = seq_print_ip_sym(s, field->ip, sym_flags); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1521 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1522 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1523 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1524 | field->parent_ip) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1525 | ret = trace_seq_printf(s, " <-"); |
| 1526 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1527 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1528 | if (kretprobed(field->parent_ip)) |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1529 | ret = trace_seq_puts(s, KRETPROBE_MSG); |
| 1530 | else |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1531 | ret = seq_print_ip_sym(s, |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1532 | field->parent_ip, |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1533 | sym_flags); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1534 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1535 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1536 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1537 | ret = trace_seq_printf(s, "\n"); |
| 1538 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1539 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1540 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1541 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1542 | case TRACE_CTX: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1543 | case TRACE_WAKE: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1544 | struct ctx_switch_entry *field; |
| 1545 | |
| 1546 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1547 | |
| 1548 | S = field->prev_state < sizeof(state_to_char) ? |
| 1549 | state_to_char[field->prev_state] : 'X'; |
| 1550 | T = field->next_state < sizeof(state_to_char) ? |
| 1551 | state_to_char[field->next_state] : 'X'; |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 1552 | ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1553 | field->prev_pid, |
| 1554 | field->prev_prio, |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1555 | S, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1556 | entry->type == TRACE_CTX ? "==>" : " +", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1557 | field->next_cpu, |
| 1558 | field->next_pid, |
| 1559 | field->next_prio, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1560 | T); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1561 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1562 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1563 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1564 | } |
| 1565 | case TRACE_SPECIAL: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1566 | struct special_entry *field; |
| 1567 | |
| 1568 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1569 | |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1570 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1571 | field->arg1, |
| 1572 | field->arg2, |
| 1573 | field->arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1574 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1575 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1576 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1577 | } |
| 1578 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1579 | struct stack_entry *field; |
| 1580 | |
| 1581 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1582 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1583 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1584 | if (i) { |
| 1585 | ret = trace_seq_puts(s, " <= "); |
| 1586 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1587 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1588 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1589 | ret = seq_print_ip_sym(s, field->caller[i], |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1590 | sym_flags); |
| 1591 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1592 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1593 | } |
| 1594 | ret = trace_seq_puts(s, "\n"); |
| 1595 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1596 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1597 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1598 | } |
| 1599 | case TRACE_PRINT: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1600 | struct print_entry *field; |
| 1601 | |
| 1602 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1603 | |
| 1604 | seq_print_ip_sym(s, field->ip, sym_flags); |
| 1605 | trace_seq_printf(s, ": %s", field->buf); |
| 1606 | if (entry->flags & TRACE_FLAG_CONT) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1607 | trace_seq_print_cont(s, iter); |
| 1608 | break; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1609 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1610 | } |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1611 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1612 | } |
| 1613 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1614 | static enum print_line_t print_raw_fmt(struct trace_iterator *iter) |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1615 | { |
| 1616 | struct trace_seq *s = &iter->seq; |
| 1617 | struct trace_entry *entry; |
| 1618 | int ret; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1619 | int S, T; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1620 | |
| 1621 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1622 | |
| 1623 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1624 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1625 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1626 | ret = trace_seq_printf(s, "%d %d %llu ", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1627 | entry->pid, iter->cpu, iter->ts); |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1628 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1629 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1630 | |
| 1631 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1632 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1633 | struct ftrace_entry *field; |
| 1634 | |
| 1635 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1636 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1637 | ret = trace_seq_printf(s, "%x %x\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1638 | field->ip, |
| 1639 | field->parent_ip); |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1640 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1641 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1642 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1643 | } |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1644 | case TRACE_CTX: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1645 | case TRACE_WAKE: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1646 | struct ctx_switch_entry *field; |
| 1647 | |
| 1648 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1649 | |
| 1650 | S = field->prev_state < sizeof(state_to_char) ? |
| 1651 | state_to_char[field->prev_state] : 'X'; |
| 1652 | T = field->next_state < sizeof(state_to_char) ? |
| 1653 | state_to_char[field->next_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1654 | if (entry->type == TRACE_WAKE) |
| 1655 | S = '+'; |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 1656 | ret = trace_seq_printf(s, "%d %d %c %d %d %d %c\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1657 | field->prev_pid, |
| 1658 | field->prev_prio, |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1659 | S, |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1660 | field->next_cpu, |
| 1661 | field->next_pid, |
| 1662 | field->next_prio, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1663 | T); |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1664 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1665 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1666 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1667 | } |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1668 | case TRACE_SPECIAL: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1669 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1670 | struct special_entry *field; |
| 1671 | |
| 1672 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1673 | |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1674 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1675 | field->arg1, |
| 1676 | field->arg2, |
| 1677 | field->arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1678 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1679 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1680 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1681 | } |
| 1682 | case TRACE_PRINT: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1683 | struct print_entry *field; |
| 1684 | |
| 1685 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1686 | |
| 1687 | trace_seq_printf(s, "# %lx %s", field->ip, field->buf); |
| 1688 | if (entry->flags & TRACE_FLAG_CONT) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1689 | trace_seq_print_cont(s, iter); |
| 1690 | break; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1691 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1692 | } |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1693 | return TRACE_TYPE_HANDLED; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1694 | } |
| 1695 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1696 | #define SEQ_PUT_FIELD_RET(s, x) \ |
| 1697 | do { \ |
| 1698 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ |
| 1699 | return 0; \ |
| 1700 | } while (0) |
| 1701 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1702 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
| 1703 | do { \ |
Harvey Harrison | ad0a3b6 | 2008-10-08 17:44:55 -0700 | [diff] [blame] | 1704 | BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES); \ |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1705 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ |
| 1706 | return 0; \ |
| 1707 | } while (0) |
| 1708 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1709 | static enum print_line_t print_hex_fmt(struct trace_iterator *iter) |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1710 | { |
| 1711 | struct trace_seq *s = &iter->seq; |
| 1712 | unsigned char newline = '\n'; |
| 1713 | struct trace_entry *entry; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1714 | int S, T; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1715 | |
| 1716 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1717 | |
| 1718 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1719 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1720 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1721 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1722 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1723 | SEQ_PUT_HEX_FIELD_RET(s, iter->ts); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1724 | |
| 1725 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1726 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1727 | struct ftrace_entry *field; |
| 1728 | |
| 1729 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1730 | |
| 1731 | SEQ_PUT_HEX_FIELD_RET(s, field->ip); |
| 1732 | SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1733 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1734 | } |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1735 | case TRACE_CTX: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1736 | case TRACE_WAKE: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1737 | struct ctx_switch_entry *field; |
| 1738 | |
| 1739 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1740 | |
| 1741 | S = field->prev_state < sizeof(state_to_char) ? |
| 1742 | state_to_char[field->prev_state] : 'X'; |
| 1743 | T = field->next_state < sizeof(state_to_char) ? |
| 1744 | state_to_char[field->next_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1745 | if (entry->type == TRACE_WAKE) |
| 1746 | S = '+'; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1747 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid); |
| 1748 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1749 | SEQ_PUT_HEX_FIELD_RET(s, S); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1750 | SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu); |
| 1751 | SEQ_PUT_HEX_FIELD_RET(s, field->next_pid); |
| 1752 | SEQ_PUT_HEX_FIELD_RET(s, field->next_prio); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1753 | SEQ_PUT_HEX_FIELD_RET(s, T); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1754 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1755 | } |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1756 | case TRACE_SPECIAL: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1757 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1758 | struct special_entry *field; |
| 1759 | |
| 1760 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1761 | |
| 1762 | SEQ_PUT_HEX_FIELD_RET(s, field->arg1); |
| 1763 | SEQ_PUT_HEX_FIELD_RET(s, field->arg2); |
| 1764 | SEQ_PUT_HEX_FIELD_RET(s, field->arg3); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1765 | break; |
| 1766 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1767 | } |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1768 | SEQ_PUT_FIELD_RET(s, newline); |
| 1769 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1770 | return TRACE_TYPE_HANDLED; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1771 | } |
| 1772 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1773 | static enum print_line_t print_bin_fmt(struct trace_iterator *iter) |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1774 | { |
| 1775 | struct trace_seq *s = &iter->seq; |
| 1776 | struct trace_entry *entry; |
| 1777 | |
| 1778 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1779 | |
| 1780 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1781 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1782 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1783 | SEQ_PUT_FIELD_RET(s, entry->pid); |
| 1784 | SEQ_PUT_FIELD_RET(s, iter->cpu); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1785 | SEQ_PUT_FIELD_RET(s, iter->ts); |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1786 | |
| 1787 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1788 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1789 | struct ftrace_entry *field; |
| 1790 | |
| 1791 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1792 | |
| 1793 | SEQ_PUT_FIELD_RET(s, field->ip); |
| 1794 | SEQ_PUT_FIELD_RET(s, field->parent_ip); |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1795 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1796 | } |
| 1797 | case TRACE_CTX: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1798 | struct ctx_switch_entry *field; |
| 1799 | |
| 1800 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1801 | |
| 1802 | SEQ_PUT_FIELD_RET(s, field->prev_pid); |
| 1803 | SEQ_PUT_FIELD_RET(s, field->prev_prio); |
| 1804 | SEQ_PUT_FIELD_RET(s, field->prev_state); |
| 1805 | SEQ_PUT_FIELD_RET(s, field->next_pid); |
| 1806 | SEQ_PUT_FIELD_RET(s, field->next_prio); |
| 1807 | SEQ_PUT_FIELD_RET(s, field->next_state); |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1808 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1809 | } |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1810 | case TRACE_SPECIAL: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1811 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1812 | struct special_entry *field; |
| 1813 | |
| 1814 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1815 | |
| 1816 | SEQ_PUT_FIELD_RET(s, field->arg1); |
| 1817 | SEQ_PUT_FIELD_RET(s, field->arg2); |
| 1818 | SEQ_PUT_FIELD_RET(s, field->arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1819 | break; |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1820 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1821 | } |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1822 | return 1; |
| 1823 | } |
| 1824 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1825 | static int trace_empty(struct trace_iterator *iter) |
| 1826 | { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1827 | int cpu; |
| 1828 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1829 | for_each_tracing_cpu(cpu) { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1830 | if (iter->buffer_iter[cpu]) { |
| 1831 | if (!ring_buffer_iter_empty(iter->buffer_iter[cpu])) |
| 1832 | return 0; |
| 1833 | } else { |
| 1834 | if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu)) |
| 1835 | return 0; |
| 1836 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1837 | } |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1838 | |
Frederic Weisbecker | 797d371 | 2008-09-30 18:13:45 +0200 | [diff] [blame] | 1839 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1840 | } |
| 1841 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1842 | static enum print_line_t print_trace_line(struct trace_iterator *iter) |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1843 | { |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1844 | enum print_line_t ret; |
| 1845 | |
| 1846 | if (iter->trace && iter->trace->print_line) { |
| 1847 | ret = iter->trace->print_line(iter); |
| 1848 | if (ret != TRACE_TYPE_UNHANDLED) |
| 1849 | return ret; |
| 1850 | } |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 1851 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1852 | if (trace_flags & TRACE_ITER_BIN) |
| 1853 | return print_bin_fmt(iter); |
| 1854 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1855 | if (trace_flags & TRACE_ITER_HEX) |
| 1856 | return print_hex_fmt(iter); |
| 1857 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1858 | if (trace_flags & TRACE_ITER_RAW) |
| 1859 | return print_raw_fmt(iter); |
| 1860 | |
| 1861 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) |
| 1862 | return print_lat_fmt(iter, iter->idx, iter->cpu); |
| 1863 | |
| 1864 | return print_trace_fmt(iter); |
| 1865 | } |
| 1866 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1867 | static int s_show(struct seq_file *m, void *v) |
| 1868 | { |
| 1869 | struct trace_iterator *iter = v; |
| 1870 | |
| 1871 | if (iter->ent == NULL) { |
| 1872 | if (iter->tr) { |
| 1873 | seq_printf(m, "# tracer: %s\n", iter->trace->name); |
| 1874 | seq_puts(m, "#\n"); |
| 1875 | } |
| 1876 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { |
| 1877 | /* print nothing if the buffers are empty */ |
| 1878 | if (trace_empty(iter)) |
| 1879 | return 0; |
| 1880 | print_trace_header(m, iter); |
| 1881 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1882 | print_lat_help_header(m); |
| 1883 | } else { |
| 1884 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1885 | print_func_help_header(m); |
| 1886 | } |
| 1887 | } else { |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1888 | print_trace_line(iter); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1889 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1890 | } |
| 1891 | |
| 1892 | return 0; |
| 1893 | } |
| 1894 | |
| 1895 | static struct seq_operations tracer_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1896 | .start = s_start, |
| 1897 | .next = s_next, |
| 1898 | .stop = s_stop, |
| 1899 | .show = s_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1900 | }; |
| 1901 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1902 | static struct trace_iterator * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1903 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
| 1904 | { |
| 1905 | struct trace_iterator *iter; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1906 | struct seq_file *m; |
| 1907 | int cpu; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1908 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1909 | if (tracing_disabled) { |
| 1910 | *ret = -ENODEV; |
| 1911 | return NULL; |
| 1912 | } |
| 1913 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1914 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 1915 | if (!iter) { |
| 1916 | *ret = -ENOMEM; |
| 1917 | goto out; |
| 1918 | } |
| 1919 | |
| 1920 | mutex_lock(&trace_types_lock); |
| 1921 | if (current_trace && current_trace->print_max) |
| 1922 | iter->tr = &max_tr; |
| 1923 | else |
| 1924 | iter->tr = inode->i_private; |
| 1925 | iter->trace = current_trace; |
| 1926 | iter->pos = -1; |
| 1927 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1928 | for_each_tracing_cpu(cpu) { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1929 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1930 | iter->buffer_iter[cpu] = |
| 1931 | ring_buffer_read_start(iter->tr->buffer, cpu); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1932 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1933 | if (!iter->buffer_iter[cpu]) |
| 1934 | goto fail_buffer; |
| 1935 | } |
| 1936 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1937 | /* TODO stop tracer */ |
| 1938 | *ret = seq_open(file, &tracer_seq_ops); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1939 | if (*ret) |
| 1940 | goto fail_buffer; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1941 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1942 | m = file->private_data; |
| 1943 | m->private = iter; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1944 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1945 | /* stop the trace while dumping */ |
| 1946 | if (iter->tr->ctrl) { |
| 1947 | tracer_enabled = 0; |
| 1948 | ftrace_function_enabled = 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1949 | } |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1950 | |
| 1951 | if (iter->trace && iter->trace->open) |
| 1952 | iter->trace->open(iter); |
| 1953 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1954 | mutex_unlock(&trace_types_lock); |
| 1955 | |
| 1956 | out: |
| 1957 | return iter; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1958 | |
| 1959 | fail_buffer: |
| 1960 | for_each_tracing_cpu(cpu) { |
| 1961 | if (iter->buffer_iter[cpu]) |
| 1962 | ring_buffer_read_finish(iter->buffer_iter[cpu]); |
| 1963 | } |
| 1964 | mutex_unlock(&trace_types_lock); |
| 1965 | |
| 1966 | return ERR_PTR(-ENOMEM); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1967 | } |
| 1968 | |
| 1969 | int tracing_open_generic(struct inode *inode, struct file *filp) |
| 1970 | { |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1971 | if (tracing_disabled) |
| 1972 | return -ENODEV; |
| 1973 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1974 | filp->private_data = inode->i_private; |
| 1975 | return 0; |
| 1976 | } |
| 1977 | |
| 1978 | int tracing_release(struct inode *inode, struct file *file) |
| 1979 | { |
| 1980 | struct seq_file *m = (struct seq_file *)file->private_data; |
| 1981 | struct trace_iterator *iter = m->private; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1982 | int cpu; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1983 | |
| 1984 | mutex_lock(&trace_types_lock); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1985 | for_each_tracing_cpu(cpu) { |
| 1986 | if (iter->buffer_iter[cpu]) |
| 1987 | ring_buffer_read_finish(iter->buffer_iter[cpu]); |
| 1988 | } |
| 1989 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1990 | if (iter->trace && iter->trace->close) |
| 1991 | iter->trace->close(iter); |
| 1992 | |
| 1993 | /* reenable tracing if it was previously enabled */ |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 1994 | if (iter->tr->ctrl) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1995 | tracer_enabled = 1; |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 1996 | /* |
| 1997 | * It is safe to enable function tracing even if it |
| 1998 | * isn't used |
| 1999 | */ |
| 2000 | ftrace_function_enabled = 1; |
| 2001 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2002 | mutex_unlock(&trace_types_lock); |
| 2003 | |
| 2004 | seq_release(inode, file); |
| 2005 | kfree(iter); |
| 2006 | return 0; |
| 2007 | } |
| 2008 | |
| 2009 | static int tracing_open(struct inode *inode, struct file *file) |
| 2010 | { |
| 2011 | int ret; |
| 2012 | |
| 2013 | __tracing_open(inode, file, &ret); |
| 2014 | |
| 2015 | return ret; |
| 2016 | } |
| 2017 | |
| 2018 | static int tracing_lt_open(struct inode *inode, struct file *file) |
| 2019 | { |
| 2020 | struct trace_iterator *iter; |
| 2021 | int ret; |
| 2022 | |
| 2023 | iter = __tracing_open(inode, file, &ret); |
| 2024 | |
| 2025 | if (!ret) |
| 2026 | iter->iter_flags |= TRACE_FILE_LAT_FMT; |
| 2027 | |
| 2028 | return ret; |
| 2029 | } |
| 2030 | |
| 2031 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 2032 | static void * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2033 | t_next(struct seq_file *m, void *v, loff_t *pos) |
| 2034 | { |
| 2035 | struct tracer *t = m->private; |
| 2036 | |
| 2037 | (*pos)++; |
| 2038 | |
| 2039 | if (t) |
| 2040 | t = t->next; |
| 2041 | |
| 2042 | m->private = t; |
| 2043 | |
| 2044 | return t; |
| 2045 | } |
| 2046 | |
| 2047 | static void *t_start(struct seq_file *m, loff_t *pos) |
| 2048 | { |
| 2049 | struct tracer *t = m->private; |
| 2050 | loff_t l = 0; |
| 2051 | |
| 2052 | mutex_lock(&trace_types_lock); |
| 2053 | for (; t && l < *pos; t = t_next(m, t, &l)) |
| 2054 | ; |
| 2055 | |
| 2056 | return t; |
| 2057 | } |
| 2058 | |
| 2059 | static void t_stop(struct seq_file *m, void *p) |
| 2060 | { |
| 2061 | mutex_unlock(&trace_types_lock); |
| 2062 | } |
| 2063 | |
| 2064 | static int t_show(struct seq_file *m, void *v) |
| 2065 | { |
| 2066 | struct tracer *t = v; |
| 2067 | |
| 2068 | if (!t) |
| 2069 | return 0; |
| 2070 | |
| 2071 | seq_printf(m, "%s", t->name); |
| 2072 | if (t->next) |
| 2073 | seq_putc(m, ' '); |
| 2074 | else |
| 2075 | seq_putc(m, '\n'); |
| 2076 | |
| 2077 | return 0; |
| 2078 | } |
| 2079 | |
| 2080 | static struct seq_operations show_traces_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2081 | .start = t_start, |
| 2082 | .next = t_next, |
| 2083 | .stop = t_stop, |
| 2084 | .show = t_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2085 | }; |
| 2086 | |
| 2087 | static int show_traces_open(struct inode *inode, struct file *file) |
| 2088 | { |
| 2089 | int ret; |
| 2090 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2091 | if (tracing_disabled) |
| 2092 | return -ENODEV; |
| 2093 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2094 | ret = seq_open(file, &show_traces_seq_ops); |
| 2095 | if (!ret) { |
| 2096 | struct seq_file *m = file->private_data; |
| 2097 | m->private = trace_types; |
| 2098 | } |
| 2099 | |
| 2100 | return ret; |
| 2101 | } |
| 2102 | |
| 2103 | static struct file_operations tracing_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2104 | .open = tracing_open, |
| 2105 | .read = seq_read, |
| 2106 | .llseek = seq_lseek, |
| 2107 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2108 | }; |
| 2109 | |
| 2110 | static struct file_operations tracing_lt_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2111 | .open = tracing_lt_open, |
| 2112 | .read = seq_read, |
| 2113 | .llseek = seq_lseek, |
| 2114 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2115 | }; |
| 2116 | |
| 2117 | static struct file_operations show_traces_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2118 | .open = show_traces_open, |
| 2119 | .read = seq_read, |
| 2120 | .release = seq_release, |
| 2121 | }; |
| 2122 | |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2123 | /* |
| 2124 | * Only trace on a CPU if the bitmask is set: |
| 2125 | */ |
| 2126 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; |
| 2127 | |
| 2128 | /* |
| 2129 | * When tracing/tracing_cpu_mask is modified then this holds |
| 2130 | * the new bitmask we are about to install: |
| 2131 | */ |
| 2132 | static cpumask_t tracing_cpumask_new; |
| 2133 | |
| 2134 | /* |
| 2135 | * The tracer itself will not take this lock, but still we want |
| 2136 | * to provide a consistent cpumask to user-space: |
| 2137 | */ |
| 2138 | static DEFINE_MUTEX(tracing_cpumask_update_lock); |
| 2139 | |
| 2140 | /* |
| 2141 | * Temporary storage for the character representation of the |
| 2142 | * CPU bitmask (and one more byte for the newline): |
| 2143 | */ |
| 2144 | static char mask_str[NR_CPUS + 1]; |
| 2145 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2146 | static ssize_t |
| 2147 | tracing_cpumask_read(struct file *filp, char __user *ubuf, |
| 2148 | size_t count, loff_t *ppos) |
| 2149 | { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2150 | int len; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2151 | |
| 2152 | mutex_lock(&tracing_cpumask_update_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2153 | |
| 2154 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); |
| 2155 | if (count - len < 2) { |
| 2156 | count = -EINVAL; |
| 2157 | goto out_err; |
| 2158 | } |
| 2159 | len += sprintf(mask_str + len, "\n"); |
| 2160 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); |
| 2161 | |
| 2162 | out_err: |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2163 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2164 | |
| 2165 | return count; |
| 2166 | } |
| 2167 | |
| 2168 | static ssize_t |
| 2169 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, |
| 2170 | size_t count, loff_t *ppos) |
| 2171 | { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2172 | int err, cpu; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2173 | |
| 2174 | mutex_lock(&tracing_cpumask_update_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2175 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
| 2176 | if (err) |
| 2177 | goto err_unlock; |
| 2178 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2179 | raw_local_irq_disable(); |
| 2180 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2181 | for_each_tracing_cpu(cpu) { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2182 | /* |
| 2183 | * Increase/decrease the disabled counter if we are |
| 2184 | * about to flip a bit in the cpumask: |
| 2185 | */ |
| 2186 | if (cpu_isset(cpu, tracing_cpumask) && |
| 2187 | !cpu_isset(cpu, tracing_cpumask_new)) { |
| 2188 | atomic_inc(&global_trace.data[cpu]->disabled); |
| 2189 | } |
| 2190 | if (!cpu_isset(cpu, tracing_cpumask) && |
| 2191 | cpu_isset(cpu, tracing_cpumask_new)) { |
| 2192 | atomic_dec(&global_trace.data[cpu]->disabled); |
| 2193 | } |
| 2194 | } |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2195 | __raw_spin_unlock(&ftrace_max_lock); |
| 2196 | raw_local_irq_enable(); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2197 | |
| 2198 | tracing_cpumask = tracing_cpumask_new; |
| 2199 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2200 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2201 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2202 | return count; |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2203 | |
| 2204 | err_unlock: |
| 2205 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2206 | |
| 2207 | return err; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2208 | } |
| 2209 | |
| 2210 | static struct file_operations tracing_cpumask_fops = { |
| 2211 | .open = tracing_open_generic, |
| 2212 | .read = tracing_cpumask_read, |
| 2213 | .write = tracing_cpumask_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2214 | }; |
| 2215 | |
| 2216 | static ssize_t |
| 2217 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, |
| 2218 | size_t cnt, loff_t *ppos) |
| 2219 | { |
| 2220 | char *buf; |
| 2221 | int r = 0; |
| 2222 | int len = 0; |
| 2223 | int i; |
| 2224 | |
| 2225 | /* calulate max size */ |
| 2226 | for (i = 0; trace_options[i]; i++) { |
| 2227 | len += strlen(trace_options[i]); |
| 2228 | len += 3; /* "no" and space */ |
| 2229 | } |
| 2230 | |
| 2231 | /* +2 for \n and \0 */ |
| 2232 | buf = kmalloc(len + 2, GFP_KERNEL); |
| 2233 | if (!buf) |
| 2234 | return -ENOMEM; |
| 2235 | |
| 2236 | for (i = 0; trace_options[i]; i++) { |
| 2237 | if (trace_flags & (1 << i)) |
| 2238 | r += sprintf(buf + r, "%s ", trace_options[i]); |
| 2239 | else |
| 2240 | r += sprintf(buf + r, "no%s ", trace_options[i]); |
| 2241 | } |
| 2242 | |
| 2243 | r += sprintf(buf + r, "\n"); |
| 2244 | WARN_ON(r >= len + 2); |
| 2245 | |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2246 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2247 | |
| 2248 | kfree(buf); |
| 2249 | |
| 2250 | return r; |
| 2251 | } |
| 2252 | |
| 2253 | static ssize_t |
| 2254 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, |
| 2255 | size_t cnt, loff_t *ppos) |
| 2256 | { |
| 2257 | char buf[64]; |
| 2258 | char *cmp = buf; |
| 2259 | int neg = 0; |
| 2260 | int i; |
| 2261 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2262 | if (cnt >= sizeof(buf)) |
| 2263 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2264 | |
| 2265 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2266 | return -EFAULT; |
| 2267 | |
| 2268 | buf[cnt] = 0; |
| 2269 | |
| 2270 | if (strncmp(buf, "no", 2) == 0) { |
| 2271 | neg = 1; |
| 2272 | cmp += 2; |
| 2273 | } |
| 2274 | |
| 2275 | for (i = 0; trace_options[i]; i++) { |
| 2276 | int len = strlen(trace_options[i]); |
| 2277 | |
| 2278 | if (strncmp(cmp, trace_options[i], len) == 0) { |
| 2279 | if (neg) |
| 2280 | trace_flags &= ~(1 << i); |
| 2281 | else |
| 2282 | trace_flags |= (1 << i); |
| 2283 | break; |
| 2284 | } |
| 2285 | } |
Ingo Molnar | 442e544 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 2286 | /* |
| 2287 | * If no option could be set, return an error: |
| 2288 | */ |
| 2289 | if (!trace_options[i]) |
| 2290 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2291 | |
| 2292 | filp->f_pos += cnt; |
| 2293 | |
| 2294 | return cnt; |
| 2295 | } |
| 2296 | |
| 2297 | static struct file_operations tracing_iter_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2298 | .open = tracing_open_generic, |
| 2299 | .read = tracing_iter_ctrl_read, |
| 2300 | .write = tracing_iter_ctrl_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2301 | }; |
| 2302 | |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2303 | static const char readme_msg[] = |
| 2304 | "tracing mini-HOWTO:\n\n" |
| 2305 | "# mkdir /debug\n" |
| 2306 | "# mount -t debugfs nodev /debug\n\n" |
| 2307 | "# cat /debug/tracing/available_tracers\n" |
| 2308 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" |
| 2309 | "# cat /debug/tracing/current_tracer\n" |
| 2310 | "none\n" |
| 2311 | "# echo sched_switch > /debug/tracing/current_tracer\n" |
| 2312 | "# cat /debug/tracing/current_tracer\n" |
| 2313 | "sched_switch\n" |
| 2314 | "# cat /debug/tracing/iter_ctrl\n" |
| 2315 | "noprint-parent nosym-offset nosym-addr noverbose\n" |
| 2316 | "# echo print-parent > /debug/tracing/iter_ctrl\n" |
| 2317 | "# echo 1 > /debug/tracing/tracing_enabled\n" |
| 2318 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" |
| 2319 | "echo 0 > /debug/tracing/tracing_enabled\n" |
| 2320 | ; |
| 2321 | |
| 2322 | static ssize_t |
| 2323 | tracing_readme_read(struct file *filp, char __user *ubuf, |
| 2324 | size_t cnt, loff_t *ppos) |
| 2325 | { |
| 2326 | return simple_read_from_buffer(ubuf, cnt, ppos, |
| 2327 | readme_msg, strlen(readme_msg)); |
| 2328 | } |
| 2329 | |
| 2330 | static struct file_operations tracing_readme_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2331 | .open = tracing_open_generic, |
| 2332 | .read = tracing_readme_read, |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2333 | }; |
| 2334 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2335 | static ssize_t |
| 2336 | tracing_ctrl_read(struct file *filp, char __user *ubuf, |
| 2337 | size_t cnt, loff_t *ppos) |
| 2338 | { |
| 2339 | struct trace_array *tr = filp->private_data; |
| 2340 | char buf[64]; |
| 2341 | int r; |
| 2342 | |
| 2343 | r = sprintf(buf, "%ld\n", tr->ctrl); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2344 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2345 | } |
| 2346 | |
| 2347 | static ssize_t |
| 2348 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, |
| 2349 | size_t cnt, loff_t *ppos) |
| 2350 | { |
| 2351 | struct trace_array *tr = filp->private_data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2352 | char buf[64]; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2353 | long val; |
| 2354 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2355 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2356 | if (cnt >= sizeof(buf)) |
| 2357 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2358 | |
| 2359 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2360 | return -EFAULT; |
| 2361 | |
| 2362 | buf[cnt] = 0; |
| 2363 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2364 | ret = strict_strtoul(buf, 10, &val); |
| 2365 | if (ret < 0) |
| 2366 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2367 | |
| 2368 | val = !!val; |
| 2369 | |
| 2370 | mutex_lock(&trace_types_lock); |
| 2371 | if (tr->ctrl ^ val) { |
| 2372 | if (val) |
| 2373 | tracer_enabled = 1; |
| 2374 | else |
| 2375 | tracer_enabled = 0; |
| 2376 | |
| 2377 | tr->ctrl = val; |
| 2378 | |
| 2379 | if (current_trace && current_trace->ctrl_update) |
| 2380 | current_trace->ctrl_update(tr); |
| 2381 | } |
| 2382 | mutex_unlock(&trace_types_lock); |
| 2383 | |
| 2384 | filp->f_pos += cnt; |
| 2385 | |
| 2386 | return cnt; |
| 2387 | } |
| 2388 | |
| 2389 | static ssize_t |
| 2390 | tracing_set_trace_read(struct file *filp, char __user *ubuf, |
| 2391 | size_t cnt, loff_t *ppos) |
| 2392 | { |
| 2393 | char buf[max_tracer_type_len+2]; |
| 2394 | int r; |
| 2395 | |
| 2396 | mutex_lock(&trace_types_lock); |
| 2397 | if (current_trace) |
| 2398 | r = sprintf(buf, "%s\n", current_trace->name); |
| 2399 | else |
| 2400 | r = sprintf(buf, "\n"); |
| 2401 | mutex_unlock(&trace_types_lock); |
| 2402 | |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2403 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2404 | } |
| 2405 | |
Peter Zijlstra | d9e5407 | 2008-11-01 19:57:37 +0100 | [diff] [blame^] | 2406 | static int tracing_set_tracer(char *buf) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2407 | { |
| 2408 | struct trace_array *tr = &global_trace; |
| 2409 | struct tracer *t; |
Peter Zijlstra | d9e5407 | 2008-11-01 19:57:37 +0100 | [diff] [blame^] | 2410 | int ret = 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2411 | |
| 2412 | mutex_lock(&trace_types_lock); |
| 2413 | for (t = trace_types; t; t = t->next) { |
| 2414 | if (strcmp(t->name, buf) == 0) |
| 2415 | break; |
| 2416 | } |
Frederic Weisbecker | c2931e0 | 2008-10-04 22:04:44 +0200 | [diff] [blame] | 2417 | if (!t) { |
| 2418 | ret = -EINVAL; |
| 2419 | goto out; |
| 2420 | } |
| 2421 | if (t == current_trace) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2422 | goto out; |
| 2423 | |
| 2424 | if (current_trace && current_trace->reset) |
| 2425 | current_trace->reset(tr); |
| 2426 | |
| 2427 | current_trace = t; |
| 2428 | if (t->init) |
| 2429 | t->init(tr); |
| 2430 | |
| 2431 | out: |
| 2432 | mutex_unlock(&trace_types_lock); |
| 2433 | |
Peter Zijlstra | d9e5407 | 2008-11-01 19:57:37 +0100 | [diff] [blame^] | 2434 | return ret; |
| 2435 | } |
| 2436 | |
| 2437 | static ssize_t |
| 2438 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, |
| 2439 | size_t cnt, loff_t *ppos) |
| 2440 | { |
| 2441 | char buf[max_tracer_type_len+1]; |
| 2442 | int i; |
| 2443 | size_t ret; |
| 2444 | |
| 2445 | if (cnt > max_tracer_type_len) |
| 2446 | cnt = max_tracer_type_len; |
| 2447 | |
| 2448 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2449 | return -EFAULT; |
| 2450 | |
| 2451 | buf[cnt] = 0; |
| 2452 | |
| 2453 | /* strip ending whitespace. */ |
| 2454 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) |
| 2455 | buf[i] = 0; |
| 2456 | |
| 2457 | ret = tracing_set_tracer(buf); |
| 2458 | if (!ret) |
| 2459 | ret = cnt; |
| 2460 | |
Steven Rostedt | 60063a6 | 2008-10-28 10:44:24 -0400 | [diff] [blame] | 2461 | if (ret > 0) |
| 2462 | filp->f_pos += ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2463 | |
Frederic Weisbecker | c2931e0 | 2008-10-04 22:04:44 +0200 | [diff] [blame] | 2464 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2465 | } |
| 2466 | |
| 2467 | static ssize_t |
| 2468 | tracing_max_lat_read(struct file *filp, char __user *ubuf, |
| 2469 | size_t cnt, loff_t *ppos) |
| 2470 | { |
| 2471 | unsigned long *ptr = filp->private_data; |
| 2472 | char buf[64]; |
| 2473 | int r; |
| 2474 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2475 | r = snprintf(buf, sizeof(buf), "%ld\n", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2476 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2477 | if (r > sizeof(buf)) |
| 2478 | r = sizeof(buf); |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2479 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2480 | } |
| 2481 | |
| 2482 | static ssize_t |
| 2483 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, |
| 2484 | size_t cnt, loff_t *ppos) |
| 2485 | { |
| 2486 | long *ptr = filp->private_data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2487 | char buf[64]; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2488 | long val; |
| 2489 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2490 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2491 | if (cnt >= sizeof(buf)) |
| 2492 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2493 | |
| 2494 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2495 | return -EFAULT; |
| 2496 | |
| 2497 | buf[cnt] = 0; |
| 2498 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2499 | ret = strict_strtoul(buf, 10, &val); |
| 2500 | if (ret < 0) |
| 2501 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2502 | |
| 2503 | *ptr = val * 1000; |
| 2504 | |
| 2505 | return cnt; |
| 2506 | } |
| 2507 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2508 | static atomic_t tracing_reader; |
| 2509 | |
| 2510 | static int tracing_open_pipe(struct inode *inode, struct file *filp) |
| 2511 | { |
| 2512 | struct trace_iterator *iter; |
| 2513 | |
| 2514 | if (tracing_disabled) |
| 2515 | return -ENODEV; |
| 2516 | |
| 2517 | /* We only allow for reader of the pipe */ |
| 2518 | if (atomic_inc_return(&tracing_reader) != 1) { |
| 2519 | atomic_dec(&tracing_reader); |
| 2520 | return -EBUSY; |
| 2521 | } |
| 2522 | |
| 2523 | /* create a buffer to store the information to pass to userspace */ |
| 2524 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 2525 | if (!iter) |
| 2526 | return -ENOMEM; |
| 2527 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2528 | mutex_lock(&trace_types_lock); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2529 | iter->tr = &global_trace; |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 2530 | iter->trace = current_trace; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2531 | filp->private_data = iter; |
| 2532 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2533 | if (iter->trace->pipe_open) |
| 2534 | iter->trace->pipe_open(iter); |
| 2535 | mutex_unlock(&trace_types_lock); |
| 2536 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2537 | return 0; |
| 2538 | } |
| 2539 | |
| 2540 | static int tracing_release_pipe(struct inode *inode, struct file *file) |
| 2541 | { |
| 2542 | struct trace_iterator *iter = file->private_data; |
| 2543 | |
| 2544 | kfree(iter); |
| 2545 | atomic_dec(&tracing_reader); |
| 2546 | |
| 2547 | return 0; |
| 2548 | } |
| 2549 | |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2550 | static unsigned int |
| 2551 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) |
| 2552 | { |
| 2553 | struct trace_iterator *iter = filp->private_data; |
| 2554 | |
| 2555 | if (trace_flags & TRACE_ITER_BLOCK) { |
| 2556 | /* |
| 2557 | * Always select as readable when in blocking mode |
| 2558 | */ |
| 2559 | return POLLIN | POLLRDNORM; |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2560 | } else { |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2561 | if (!trace_empty(iter)) |
| 2562 | return POLLIN | POLLRDNORM; |
| 2563 | poll_wait(filp, &trace_wait, poll_table); |
| 2564 | if (!trace_empty(iter)) |
| 2565 | return POLLIN | POLLRDNORM; |
| 2566 | |
| 2567 | return 0; |
| 2568 | } |
| 2569 | } |
| 2570 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2571 | /* |
| 2572 | * Consumer reader. |
| 2573 | */ |
| 2574 | static ssize_t |
| 2575 | tracing_read_pipe(struct file *filp, char __user *ubuf, |
| 2576 | size_t cnt, loff_t *ppos) |
| 2577 | { |
| 2578 | struct trace_iterator *iter = filp->private_data; |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2579 | ssize_t sret; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2580 | |
| 2581 | /* return any leftover data */ |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2582 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
| 2583 | if (sret != -EBUSY) |
| 2584 | return sret; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2585 | |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2586 | trace_seq_reset(&iter->seq); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2587 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2588 | mutex_lock(&trace_types_lock); |
| 2589 | if (iter->trace->read) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2590 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); |
| 2591 | if (sret) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2592 | goto out; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2593 | } |
| 2594 | |
Pekka Paalanen | 9ff4b97 | 2008-09-29 20:23:48 +0200 | [diff] [blame] | 2595 | waitagain: |
| 2596 | sret = 0; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2597 | while (trace_empty(iter)) { |
Steven Rostedt | 2dc8f09 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2598 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2599 | if ((filp->f_flags & O_NONBLOCK)) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2600 | sret = -EAGAIN; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2601 | goto out; |
| 2602 | } |
Steven Rostedt | 2dc8f09 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2603 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2604 | /* |
| 2605 | * This is a make-shift waitqueue. The reason we don't use |
| 2606 | * an actual wait queue is because: |
| 2607 | * 1) we only ever have one waiter |
| 2608 | * 2) the tracing, traces all functions, we don't want |
| 2609 | * the overhead of calling wake_up and friends |
| 2610 | * (and tracing them too) |
| 2611 | * Anyway, this is really very primitive wakeup. |
| 2612 | */ |
| 2613 | set_current_state(TASK_INTERRUPTIBLE); |
| 2614 | iter->tr->waiter = current; |
| 2615 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2616 | mutex_unlock(&trace_types_lock); |
| 2617 | |
Ingo Molnar | 9fe068e | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2618 | /* sleep for 100 msecs, and try again. */ |
| 2619 | schedule_timeout(HZ/10); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2620 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2621 | mutex_lock(&trace_types_lock); |
| 2622 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2623 | iter->tr->waiter = NULL; |
| 2624 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2625 | if (signal_pending(current)) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2626 | sret = -EINTR; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2627 | goto out; |
| 2628 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2629 | |
Steven Rostedt | 8452799 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2630 | if (iter->trace != current_trace) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2631 | goto out; |
Steven Rostedt | 8452799 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2632 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2633 | /* |
| 2634 | * We block until we read something and tracing is disabled. |
| 2635 | * We still block if tracing is disabled, but we have never |
| 2636 | * read anything. This allows a user to cat this file, and |
| 2637 | * then enable tracing. But after we have read something, |
| 2638 | * we give an EOF when tracing is again disabled. |
| 2639 | * |
| 2640 | * iter->pos will be 0 if we haven't read anything. |
| 2641 | */ |
| 2642 | if (!tracer_enabled && iter->pos) |
| 2643 | break; |
| 2644 | |
| 2645 | continue; |
| 2646 | } |
| 2647 | |
| 2648 | /* stop when tracing is finished */ |
| 2649 | if (trace_empty(iter)) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2650 | goto out; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2651 | |
| 2652 | if (cnt >= PAGE_SIZE) |
| 2653 | cnt = PAGE_SIZE - 1; |
| 2654 | |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2655 | /* reset all but tr, trace, and overruns */ |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2656 | memset(&iter->seq, 0, |
| 2657 | sizeof(struct trace_iterator) - |
| 2658 | offsetof(struct trace_iterator, seq)); |
Steven Rostedt | 4823ed7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2659 | iter->pos = -1; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2660 | |
Steven Rostedt | 088b1e4 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2661 | while (find_next_entry_inc(iter) != NULL) { |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 2662 | enum print_line_t ret; |
Steven Rostedt | 088b1e4 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2663 | int len = iter->seq.len; |
| 2664 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2665 | ret = print_trace_line(iter); |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 2666 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
Steven Rostedt | 088b1e4 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2667 | /* don't print partial lines */ |
| 2668 | iter->seq.len = len; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2669 | break; |
Steven Rostedt | 088b1e4 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2670 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2671 | |
| 2672 | trace_consume(iter); |
| 2673 | |
| 2674 | if (iter->seq.len >= cnt) |
| 2675 | break; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2676 | } |
| 2677 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2678 | /* Now copy what we have to the user */ |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2679 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
| 2680 | if (iter->seq.readpos >= iter->seq.len) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2681 | trace_seq_reset(&iter->seq); |
Pekka Paalanen | 9ff4b97 | 2008-09-29 20:23:48 +0200 | [diff] [blame] | 2682 | |
| 2683 | /* |
| 2684 | * If there was nothing to send to user, inspite of consuming trace |
| 2685 | * entries, go back to wait for more entries. |
| 2686 | */ |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2687 | if (sret == -EBUSY) |
Pekka Paalanen | 9ff4b97 | 2008-09-29 20:23:48 +0200 | [diff] [blame] | 2688 | goto waitagain; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2689 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2690 | out: |
| 2691 | mutex_unlock(&trace_types_lock); |
| 2692 | |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2693 | return sret; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2694 | } |
| 2695 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2696 | static ssize_t |
| 2697 | tracing_entries_read(struct file *filp, char __user *ubuf, |
| 2698 | size_t cnt, loff_t *ppos) |
| 2699 | { |
| 2700 | struct trace_array *tr = filp->private_data; |
| 2701 | char buf[64]; |
| 2702 | int r; |
| 2703 | |
| 2704 | r = sprintf(buf, "%lu\n", tr->entries); |
| 2705 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
| 2706 | } |
| 2707 | |
| 2708 | static ssize_t |
| 2709 | tracing_entries_write(struct file *filp, const char __user *ubuf, |
| 2710 | size_t cnt, loff_t *ppos) |
| 2711 | { |
| 2712 | unsigned long val; |
| 2713 | char buf[64]; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2714 | int ret; |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 2715 | struct trace_array *tr = filp->private_data; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2716 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2717 | if (cnt >= sizeof(buf)) |
| 2718 | return -EINVAL; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2719 | |
| 2720 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2721 | return -EFAULT; |
| 2722 | |
| 2723 | buf[cnt] = 0; |
| 2724 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2725 | ret = strict_strtoul(buf, 10, &val); |
| 2726 | if (ret < 0) |
| 2727 | return ret; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2728 | |
| 2729 | /* must have at least 1 entry */ |
| 2730 | if (!val) |
| 2731 | return -EINVAL; |
| 2732 | |
| 2733 | mutex_lock(&trace_types_lock); |
| 2734 | |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 2735 | if (tr->ctrl) { |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2736 | cnt = -EBUSY; |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 2737 | pr_info("ftrace: please disable tracing" |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2738 | " before modifying buffer size\n"); |
| 2739 | goto out; |
| 2740 | } |
| 2741 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2742 | if (val != global_trace.entries) { |
| 2743 | ret = ring_buffer_resize(global_trace.buffer, val); |
| 2744 | if (ret < 0) { |
| 2745 | cnt = ret; |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 2746 | goto out; |
| 2747 | } |
| 2748 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2749 | ret = ring_buffer_resize(max_tr.buffer, val); |
| 2750 | if (ret < 0) { |
| 2751 | int r; |
| 2752 | cnt = ret; |
| 2753 | r = ring_buffer_resize(global_trace.buffer, |
| 2754 | global_trace.entries); |
| 2755 | if (r < 0) { |
| 2756 | /* AARGH! We are left with different |
| 2757 | * size max buffer!!!! */ |
| 2758 | WARN_ON(1); |
| 2759 | tracing_disabled = 1; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2760 | } |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2761 | goto out; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2762 | } |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 2763 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2764 | global_trace.entries = val; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2765 | } |
| 2766 | |
| 2767 | filp->f_pos += cnt; |
| 2768 | |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 2769 | /* If check pages failed, return ENOMEM */ |
| 2770 | if (tracing_disabled) |
| 2771 | cnt = -ENOMEM; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2772 | out: |
| 2773 | max_tr.entries = global_trace.entries; |
| 2774 | mutex_unlock(&trace_types_lock); |
| 2775 | |
| 2776 | return cnt; |
| 2777 | } |
| 2778 | |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 2779 | static int mark_printk(const char *fmt, ...) |
| 2780 | { |
| 2781 | int ret; |
| 2782 | va_list args; |
| 2783 | va_start(args, fmt); |
| 2784 | ret = trace_vprintk(0, fmt, args); |
| 2785 | va_end(args); |
| 2786 | return ret; |
| 2787 | } |
| 2788 | |
| 2789 | static ssize_t |
| 2790 | tracing_mark_write(struct file *filp, const char __user *ubuf, |
| 2791 | size_t cnt, loff_t *fpos) |
| 2792 | { |
| 2793 | char *buf; |
| 2794 | char *end; |
| 2795 | struct trace_array *tr = &global_trace; |
| 2796 | |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 2797 | if (!tr->ctrl || tracing_disabled) |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 2798 | return -EINVAL; |
| 2799 | |
| 2800 | if (cnt > TRACE_BUF_SIZE) |
| 2801 | cnt = TRACE_BUF_SIZE; |
| 2802 | |
| 2803 | buf = kmalloc(cnt + 1, GFP_KERNEL); |
| 2804 | if (buf == NULL) |
| 2805 | return -ENOMEM; |
| 2806 | |
| 2807 | if (copy_from_user(buf, ubuf, cnt)) { |
| 2808 | kfree(buf); |
| 2809 | return -EFAULT; |
| 2810 | } |
| 2811 | |
| 2812 | /* Cut from the first nil or newline. */ |
| 2813 | buf[cnt] = '\0'; |
| 2814 | end = strchr(buf, '\n'); |
| 2815 | if (end) |
| 2816 | *end = '\0'; |
| 2817 | |
| 2818 | cnt = mark_printk("%s\n", buf); |
| 2819 | kfree(buf); |
| 2820 | *fpos += cnt; |
| 2821 | |
| 2822 | return cnt; |
| 2823 | } |
| 2824 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2825 | static struct file_operations tracing_max_lat_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2826 | .open = tracing_open_generic, |
| 2827 | .read = tracing_max_lat_read, |
| 2828 | .write = tracing_max_lat_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2829 | }; |
| 2830 | |
| 2831 | static struct file_operations tracing_ctrl_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2832 | .open = tracing_open_generic, |
| 2833 | .read = tracing_ctrl_read, |
| 2834 | .write = tracing_ctrl_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2835 | }; |
| 2836 | |
| 2837 | static struct file_operations set_tracer_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2838 | .open = tracing_open_generic, |
| 2839 | .read = tracing_set_trace_read, |
| 2840 | .write = tracing_set_trace_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2841 | }; |
| 2842 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2843 | static struct file_operations tracing_pipe_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2844 | .open = tracing_open_pipe, |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2845 | .poll = tracing_poll_pipe, |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2846 | .read = tracing_read_pipe, |
| 2847 | .release = tracing_release_pipe, |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2848 | }; |
| 2849 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2850 | static struct file_operations tracing_entries_fops = { |
| 2851 | .open = tracing_open_generic, |
| 2852 | .read = tracing_entries_read, |
| 2853 | .write = tracing_entries_write, |
| 2854 | }; |
| 2855 | |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 2856 | static struct file_operations tracing_mark_fops = { |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 2857 | .open = tracing_open_generic, |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 2858 | .write = tracing_mark_write, |
| 2859 | }; |
| 2860 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2861 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 2862 | |
| 2863 | static ssize_t |
| 2864 | tracing_read_long(struct file *filp, char __user *ubuf, |
| 2865 | size_t cnt, loff_t *ppos) |
| 2866 | { |
| 2867 | unsigned long *p = filp->private_data; |
| 2868 | char buf[64]; |
| 2869 | int r; |
| 2870 | |
| 2871 | r = sprintf(buf, "%ld\n", *p); |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2872 | |
| 2873 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2874 | } |
| 2875 | |
| 2876 | static struct file_operations tracing_read_long_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2877 | .open = tracing_open_generic, |
| 2878 | .read = tracing_read_long, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2879 | }; |
| 2880 | #endif |
| 2881 | |
| 2882 | static struct dentry *d_tracer; |
| 2883 | |
| 2884 | struct dentry *tracing_init_dentry(void) |
| 2885 | { |
| 2886 | static int once; |
| 2887 | |
| 2888 | if (d_tracer) |
| 2889 | return d_tracer; |
| 2890 | |
| 2891 | d_tracer = debugfs_create_dir("tracing", NULL); |
| 2892 | |
| 2893 | if (!d_tracer && !once) { |
| 2894 | once = 1; |
| 2895 | pr_warning("Could not create debugfs directory 'tracing'\n"); |
| 2896 | return NULL; |
| 2897 | } |
| 2898 | |
| 2899 | return d_tracer; |
| 2900 | } |
| 2901 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2902 | #ifdef CONFIG_FTRACE_SELFTEST |
| 2903 | /* Let selftest have access to static functions in this file */ |
| 2904 | #include "trace_selftest.c" |
| 2905 | #endif |
| 2906 | |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 2907 | static __init int tracer_init_debugfs(void) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2908 | { |
| 2909 | struct dentry *d_tracer; |
| 2910 | struct dentry *entry; |
| 2911 | |
| 2912 | d_tracer = tracing_init_dentry(); |
| 2913 | |
| 2914 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, |
| 2915 | &global_trace, &tracing_ctrl_fops); |
| 2916 | if (!entry) |
| 2917 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); |
| 2918 | |
| 2919 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, |
| 2920 | NULL, &tracing_iter_fops); |
| 2921 | if (!entry) |
| 2922 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); |
| 2923 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2924 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
| 2925 | NULL, &tracing_cpumask_fops); |
| 2926 | if (!entry) |
| 2927 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); |
| 2928 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2929 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
| 2930 | &global_trace, &tracing_lt_fops); |
| 2931 | if (!entry) |
| 2932 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); |
| 2933 | |
| 2934 | entry = debugfs_create_file("trace", 0444, d_tracer, |
| 2935 | &global_trace, &tracing_fops); |
| 2936 | if (!entry) |
| 2937 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2938 | |
| 2939 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, |
| 2940 | &global_trace, &show_traces_fops); |
| 2941 | if (!entry) |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 2942 | pr_warning("Could not create debugfs 'available_tracers' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2943 | |
| 2944 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, |
| 2945 | &global_trace, &set_tracer_fops); |
| 2946 | if (!entry) |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 2947 | pr_warning("Could not create debugfs 'current_tracer' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2948 | |
| 2949 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, |
| 2950 | &tracing_max_latency, |
| 2951 | &tracing_max_lat_fops); |
| 2952 | if (!entry) |
| 2953 | pr_warning("Could not create debugfs " |
| 2954 | "'tracing_max_latency' entry\n"); |
| 2955 | |
| 2956 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, |
| 2957 | &tracing_thresh, &tracing_max_lat_fops); |
| 2958 | if (!entry) |
| 2959 | pr_warning("Could not create debugfs " |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 2960 | "'tracing_thresh' entry\n"); |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2961 | entry = debugfs_create_file("README", 0644, d_tracer, |
| 2962 | NULL, &tracing_readme_fops); |
| 2963 | if (!entry) |
| 2964 | pr_warning("Could not create debugfs 'README' entry\n"); |
| 2965 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2966 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
| 2967 | NULL, &tracing_pipe_fops); |
| 2968 | if (!entry) |
| 2969 | pr_warning("Could not create debugfs " |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 2970 | "'trace_pipe' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2971 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2972 | entry = debugfs_create_file("trace_entries", 0644, d_tracer, |
| 2973 | &global_trace, &tracing_entries_fops); |
| 2974 | if (!entry) |
| 2975 | pr_warning("Could not create debugfs " |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 2976 | "'trace_entries' entry\n"); |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2977 | |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 2978 | entry = debugfs_create_file("trace_marker", 0220, d_tracer, |
| 2979 | NULL, &tracing_mark_fops); |
| 2980 | if (!entry) |
| 2981 | pr_warning("Could not create debugfs " |
| 2982 | "'trace_marker' entry\n"); |
| 2983 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2984 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 2985 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, |
| 2986 | &ftrace_update_tot_cnt, |
| 2987 | &tracing_read_long_fops); |
| 2988 | if (!entry) |
| 2989 | pr_warning("Could not create debugfs " |
| 2990 | "'dyn_ftrace_total_info' entry\n"); |
| 2991 | #endif |
Ingo Molnar | d618b3e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2992 | #ifdef CONFIG_SYSPROF_TRACER |
| 2993 | init_tracer_sysprof_debugfs(d_tracer); |
| 2994 | #endif |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 2995 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2996 | } |
| 2997 | |
Pekka Paalanen | 801fe40 | 2008-09-16 21:58:24 +0300 | [diff] [blame] | 2998 | int trace_vprintk(unsigned long ip, const char *fmt, va_list args) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 2999 | { |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3000 | static DEFINE_SPINLOCK(trace_buf_lock); |
| 3001 | static char trace_buf[TRACE_BUF_SIZE]; |
Peter Zijlstra | f09ce57 | 2008-09-04 10:24:14 +0200 | [diff] [blame] | 3002 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3003 | struct ring_buffer_event *event; |
Peter Zijlstra | f09ce57 | 2008-09-04 10:24:14 +0200 | [diff] [blame] | 3004 | struct trace_array *tr = &global_trace; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3005 | struct trace_array_cpu *data; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 3006 | struct print_entry *entry; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3007 | unsigned long flags, irq_flags; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3008 | int cpu, len = 0, size, pc; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3009 | |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 3010 | if (!tr->ctrl || tracing_disabled) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3011 | return 0; |
| 3012 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3013 | pc = preempt_count(); |
| 3014 | preempt_disable_notrace(); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3015 | cpu = raw_smp_processor_id(); |
| 3016 | data = tr->data[cpu]; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3017 | |
Steven Rostedt | 3ea2e6d | 2008-10-04 02:01:00 -0400 | [diff] [blame] | 3018 | if (unlikely(atomic_read(&data->disabled))) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3019 | goto out; |
| 3020 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3021 | spin_lock_irqsave(&trace_buf_lock, flags); |
Pekka Paalanen | 801fe40 | 2008-09-16 21:58:24 +0300 | [diff] [blame] | 3022 | len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3023 | |
| 3024 | len = min(len, TRACE_BUF_SIZE-1); |
| 3025 | trace_buf[len] = 0; |
| 3026 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 3027 | size = sizeof(*entry) + len + 1; |
| 3028 | event = ring_buffer_lock_reserve(tr->buffer, size, &irq_flags); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3029 | if (!event) |
| 3030 | goto out_unlock; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 3031 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3032 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 3033 | entry->ent.type = TRACE_PRINT; |
| 3034 | entry->ip = ip; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3035 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 3036 | memcpy(&entry->buf, trace_buf, len); |
| 3037 | entry->buf[len] = 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3038 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3039 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3040 | out_unlock: |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3041 | spin_unlock_irqrestore(&trace_buf_lock, flags); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3042 | |
| 3043 | out: |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3044 | preempt_enable_notrace(); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3045 | |
| 3046 | return len; |
| 3047 | } |
Pekka Paalanen | 801fe40 | 2008-09-16 21:58:24 +0300 | [diff] [blame] | 3048 | EXPORT_SYMBOL_GPL(trace_vprintk); |
| 3049 | |
| 3050 | int __ftrace_printk(unsigned long ip, const char *fmt, ...) |
| 3051 | { |
| 3052 | int ret; |
| 3053 | va_list ap; |
| 3054 | |
| 3055 | if (!(trace_flags & TRACE_ITER_PRINTK)) |
| 3056 | return 0; |
| 3057 | |
| 3058 | va_start(ap, fmt); |
| 3059 | ret = trace_vprintk(ip, fmt, ap); |
| 3060 | va_end(ap); |
| 3061 | return ret; |
| 3062 | } |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3063 | EXPORT_SYMBOL_GPL(__ftrace_printk); |
| 3064 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3065 | static int trace_panic_handler(struct notifier_block *this, |
| 3066 | unsigned long event, void *unused) |
| 3067 | { |
Steven Rostedt | 944ac42 | 2008-10-23 19:26:08 -0400 | [diff] [blame] | 3068 | if (ftrace_dump_on_oops) |
| 3069 | ftrace_dump(); |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3070 | return NOTIFY_OK; |
| 3071 | } |
| 3072 | |
| 3073 | static struct notifier_block trace_panic_notifier = { |
| 3074 | .notifier_call = trace_panic_handler, |
| 3075 | .next = NULL, |
| 3076 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ |
| 3077 | }; |
| 3078 | |
| 3079 | static int trace_die_handler(struct notifier_block *self, |
| 3080 | unsigned long val, |
| 3081 | void *data) |
| 3082 | { |
| 3083 | switch (val) { |
| 3084 | case DIE_OOPS: |
Steven Rostedt | 944ac42 | 2008-10-23 19:26:08 -0400 | [diff] [blame] | 3085 | if (ftrace_dump_on_oops) |
| 3086 | ftrace_dump(); |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3087 | break; |
| 3088 | default: |
| 3089 | break; |
| 3090 | } |
| 3091 | return NOTIFY_OK; |
| 3092 | } |
| 3093 | |
| 3094 | static struct notifier_block trace_die_notifier = { |
| 3095 | .notifier_call = trace_die_handler, |
| 3096 | .priority = 200 |
| 3097 | }; |
| 3098 | |
| 3099 | /* |
| 3100 | * printk is set to max of 1024, we really don't need it that big. |
| 3101 | * Nothing should be printing 1000 characters anyway. |
| 3102 | */ |
| 3103 | #define TRACE_MAX_PRINT 1000 |
| 3104 | |
| 3105 | /* |
| 3106 | * Define here KERN_TRACE so that we have one place to modify |
| 3107 | * it if we decide to change what log level the ftrace dump |
| 3108 | * should be at. |
| 3109 | */ |
| 3110 | #define KERN_TRACE KERN_INFO |
| 3111 | |
| 3112 | static void |
| 3113 | trace_printk_seq(struct trace_seq *s) |
| 3114 | { |
| 3115 | /* Probably should print a warning here. */ |
| 3116 | if (s->len >= 1000) |
| 3117 | s->len = 1000; |
| 3118 | |
| 3119 | /* should be zero ended, but we are paranoid. */ |
| 3120 | s->buffer[s->len] = 0; |
| 3121 | |
| 3122 | printk(KERN_TRACE "%s", s->buffer); |
| 3123 | |
| 3124 | trace_seq_reset(s); |
| 3125 | } |
| 3126 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3127 | void ftrace_dump(void) |
| 3128 | { |
| 3129 | static DEFINE_SPINLOCK(ftrace_dump_lock); |
| 3130 | /* use static because iter can be a bit big for the stack */ |
| 3131 | static struct trace_iterator iter; |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3132 | static cpumask_t mask; |
| 3133 | static int dump_ran; |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 3134 | unsigned long flags; |
| 3135 | int cnt = 0, cpu; |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3136 | |
| 3137 | /* only one dump */ |
| 3138 | spin_lock_irqsave(&ftrace_dump_lock, flags); |
| 3139 | if (dump_ran) |
| 3140 | goto out; |
| 3141 | |
| 3142 | dump_ran = 1; |
| 3143 | |
| 3144 | /* No turning back! */ |
Steven Rostedt | 81adbdc | 2008-10-23 09:33:02 -0400 | [diff] [blame] | 3145 | ftrace_kill(); |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3146 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 3147 | for_each_tracing_cpu(cpu) { |
| 3148 | atomic_inc(&global_trace.data[cpu]->disabled); |
| 3149 | } |
| 3150 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3151 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); |
| 3152 | |
| 3153 | iter.tr = &global_trace; |
| 3154 | iter.trace = current_trace; |
| 3155 | |
| 3156 | /* |
| 3157 | * We need to stop all tracing on all CPUS to read the |
| 3158 | * the next buffer. This is a bit expensive, but is |
| 3159 | * not done often. We fill all what we can read, |
| 3160 | * and then release the locks again. |
| 3161 | */ |
| 3162 | |
| 3163 | cpus_clear(mask); |
| 3164 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3165 | while (!trace_empty(&iter)) { |
| 3166 | |
| 3167 | if (!cnt) |
| 3168 | printk(KERN_TRACE "---------------------------------\n"); |
| 3169 | |
| 3170 | cnt++; |
| 3171 | |
| 3172 | /* reset all but tr, trace, and overruns */ |
| 3173 | memset(&iter.seq, 0, |
| 3174 | sizeof(struct trace_iterator) - |
| 3175 | offsetof(struct trace_iterator, seq)); |
| 3176 | iter.iter_flags |= TRACE_FILE_LAT_FMT; |
| 3177 | iter.pos = -1; |
| 3178 | |
| 3179 | if (find_next_entry_inc(&iter) != NULL) { |
| 3180 | print_trace_line(&iter); |
| 3181 | trace_consume(&iter); |
| 3182 | } |
| 3183 | |
| 3184 | trace_printk_seq(&iter.seq); |
| 3185 | } |
| 3186 | |
| 3187 | if (!cnt) |
| 3188 | printk(KERN_TRACE " (ftrace buffer empty)\n"); |
| 3189 | else |
| 3190 | printk(KERN_TRACE "---------------------------------\n"); |
| 3191 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3192 | out: |
| 3193 | spin_unlock_irqrestore(&ftrace_dump_lock, flags); |
| 3194 | } |
| 3195 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3196 | __init static int tracer_alloc_buffers(void) |
| 3197 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3198 | struct trace_array_cpu *data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3199 | int i; |
| 3200 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 3201 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 3202 | tracing_buffer_mask = cpu_possible_map; |
| 3203 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3204 | global_trace.buffer = ring_buffer_alloc(trace_buf_size, |
| 3205 | TRACE_BUFFER_FLAGS); |
| 3206 | if (!global_trace.buffer) { |
| 3207 | printk(KERN_ERR "tracer: failed to allocate ring buffer!\n"); |
| 3208 | WARN_ON(1); |
| 3209 | return 0; |
| 3210 | } |
| 3211 | global_trace.entries = ring_buffer_size(global_trace.buffer); |
| 3212 | |
| 3213 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 3214 | max_tr.buffer = ring_buffer_alloc(trace_buf_size, |
| 3215 | TRACE_BUFFER_FLAGS); |
| 3216 | if (!max_tr.buffer) { |
| 3217 | printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n"); |
| 3218 | WARN_ON(1); |
| 3219 | ring_buffer_free(global_trace.buffer); |
| 3220 | return 0; |
| 3221 | } |
| 3222 | max_tr.entries = ring_buffer_size(max_tr.buffer); |
| 3223 | WARN_ON(max_tr.entries != global_trace.entries); |
| 3224 | #endif |
| 3225 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3226 | /* Allocate the first page for all buffers */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 3227 | for_each_tracing_cpu(i) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3228 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3229 | max_tr.data[i] = &per_cpu(max_data, i); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3230 | } |
| 3231 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3232 | trace_init_cmdlines(); |
| 3233 | |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 3234 | register_tracer(&nop_trace); |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 3235 | #ifdef CONFIG_BOOT_TRACER |
| 3236 | register_tracer(&boot_tracer); |
| 3237 | current_trace = &boot_tracer; |
| 3238 | current_trace->init(&global_trace); |
| 3239 | #else |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 3240 | current_trace = &nop_trace; |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 3241 | #endif |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3242 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3243 | /* All seems OK, enable tracing */ |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 3244 | global_trace.ctrl = tracer_enabled; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3245 | tracing_disabled = 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3246 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3247 | atomic_notifier_chain_register(&panic_notifier_list, |
| 3248 | &trace_panic_notifier); |
| 3249 | |
| 3250 | register_die_notifier(&trace_die_notifier); |
| 3251 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3252 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3253 | } |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 3254 | early_initcall(tracer_alloc_buffers); |
| 3255 | fs_initcall(tracer_init_debugfs); |