Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 1 | #undef DEBUG |
| 2 | |
| 3 | /* |
| 4 | * ARM performance counter support. |
| 5 | * |
| 6 | * Copyright (C) 2009 picoChip Designs, Ltd., Jamie Iles |
Will Deacon | 43eab87 | 2010-11-13 19:04:32 +0000 | [diff] [blame] | 7 | * Copyright (C) 2010 ARM Ltd., Will Deacon <will.deacon@arm.com> |
Jean PIHET | 796d129 | 2010-01-26 18:51:05 +0100 | [diff] [blame] | 8 | * |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 9 | * This code is based on the sparc64 perf event code, which is in turn based |
| 10 | * on the x86 code. Callchain code is based on the ARM OProfile backtrace |
| 11 | * code. |
| 12 | */ |
| 13 | #define pr_fmt(fmt) "hw perfevents: " fmt |
| 14 | |
| 15 | #include <linux/interrupt.h> |
| 16 | #include <linux/kernel.h> |
Will Deacon | 181193f | 2010-04-30 11:32:44 +0100 | [diff] [blame] | 17 | #include <linux/module.h> |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 18 | #include <linux/perf_event.h> |
Will Deacon | 49c006b | 2010-04-29 17:13:24 +0100 | [diff] [blame] | 19 | #include <linux/platform_device.h> |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 20 | #include <linux/spinlock.h> |
| 21 | #include <linux/uaccess.h> |
| 22 | |
| 23 | #include <asm/cputype.h> |
| 24 | #include <asm/irq.h> |
| 25 | #include <asm/irq_regs.h> |
| 26 | #include <asm/pmu.h> |
| 27 | #include <asm/stacktrace.h> |
| 28 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 29 | /* |
Will Deacon | ecf5a89 | 2011-07-19 22:43:28 +0100 | [diff] [blame] | 30 | * ARMv6 supports a maximum of 3 events, starting from index 0. If we add |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 31 | * another platform that supports more, we need to increase this to be the |
| 32 | * largest of all platforms. |
Jean PIHET | 796d129 | 2010-01-26 18:51:05 +0100 | [diff] [blame] | 33 | * |
| 34 | * ARMv7 supports up to 32 events: |
| 35 | * cycle counter CCNT + 31 events counters CNT0..30. |
| 36 | * Cortex-A8 has 1+4 counters, Cortex-A9 has 1+6 counters. |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 37 | */ |
Will Deacon | ecf5a89 | 2011-07-19 22:43:28 +0100 | [diff] [blame] | 38 | #define ARMPMU_MAX_HWEVENTS 32 |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 39 | |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 40 | /* The events for a given PMU register set. */ |
| 41 | struct pmu_hw_events { |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 42 | /* |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 43 | * The events that are active on the PMU for the given index. |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 44 | */ |
Mark Rutland | 3fc2c83 | 2011-06-24 11:30:59 +0100 | [diff] [blame] | 45 | struct perf_event **events; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 46 | |
| 47 | /* |
| 48 | * A 1 bit for an index indicates that the counter is being used for |
| 49 | * an event. A 0 means that the counter can be used. |
| 50 | */ |
Mark Rutland | 3fc2c83 | 2011-06-24 11:30:59 +0100 | [diff] [blame] | 51 | unsigned long *used_mask; |
Mark Rutland | 0f78d2d | 2011-04-28 10:17:04 +0100 | [diff] [blame] | 52 | |
| 53 | /* |
| 54 | * Hardware lock to serialize accesses to PMU registers. Needed for the |
| 55 | * read/modify/write sequences. |
| 56 | */ |
| 57 | raw_spinlock_t pmu_lock; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 58 | }; |
Mark Rutland | 3fc2c83 | 2011-06-24 11:30:59 +0100 | [diff] [blame] | 59 | |
| 60 | static DEFINE_PER_CPU(struct perf_event * [ARMPMU_MAX_HWEVENTS], hw_events); |
| 61 | static DEFINE_PER_CPU(unsigned long [BITS_TO_LONGS(ARMPMU_MAX_HWEVENTS)], used_mask); |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 62 | static DEFINE_PER_CPU(struct pmu_hw_events, cpu_hw_events); |
Will Deacon | 181193f | 2010-04-30 11:32:44 +0100 | [diff] [blame] | 63 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 64 | struct arm_pmu { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 65 | struct pmu pmu; |
Will Deacon | 181193f | 2010-04-30 11:32:44 +0100 | [diff] [blame] | 66 | enum arm_perf_pmu_ids id; |
Mark Rutland | 7ae18a5 | 2011-06-06 10:37:50 +0100 | [diff] [blame] | 67 | enum arm_pmu_type type; |
Will Deacon | 0b390e2 | 2011-07-27 15:18:59 +0100 | [diff] [blame] | 68 | cpumask_t active_irqs; |
Will Deacon | 6299483 | 2010-11-13 18:45:27 +0000 | [diff] [blame] | 69 | const char *name; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 70 | irqreturn_t (*handle_irq)(int irq_num, void *dev); |
| 71 | void (*enable)(struct hw_perf_event *evt, int idx); |
| 72 | void (*disable)(struct hw_perf_event *evt, int idx); |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 73 | int (*get_event_idx)(struct pmu_hw_events *hw_events, |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 74 | struct hw_perf_event *hwc); |
Will Deacon | 05d22fd | 2011-07-19 11:57:30 +0100 | [diff] [blame] | 75 | int (*set_event_filter)(struct hw_perf_event *evt, |
| 76 | struct perf_event_attr *attr); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 77 | u32 (*read_counter)(int idx); |
| 78 | void (*write_counter)(int idx, u32 val); |
| 79 | void (*start)(void); |
| 80 | void (*stop)(void); |
Will Deacon | 574b69c | 2011-03-25 13:13:34 +0100 | [diff] [blame] | 81 | void (*reset)(void *); |
Mark Rutland | e1f431b | 2011-04-28 15:47:10 +0100 | [diff] [blame] | 82 | int (*map_event)(struct perf_event *event); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 83 | int num_events; |
Mark Rutland | 03b7898 | 2011-04-27 11:20:11 +0100 | [diff] [blame] | 84 | atomic_t active_events; |
| 85 | struct mutex reserve_mutex; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 86 | u64 max_period; |
Mark Rutland | a9356a0 | 2011-05-04 09:23:15 +0100 | [diff] [blame] | 87 | struct platform_device *plat_device; |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 88 | struct pmu_hw_events *(*get_hw_events)(void); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 89 | }; |
| 90 | |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 91 | #define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu)) |
| 92 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 93 | /* Set at runtime when we know what CPU type we are. */ |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 94 | static struct arm_pmu *cpu_pmu; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 95 | |
Will Deacon | 181193f | 2010-04-30 11:32:44 +0100 | [diff] [blame] | 96 | enum arm_perf_pmu_ids |
| 97 | armpmu_get_pmu_id(void) |
| 98 | { |
| 99 | int id = -ENODEV; |
| 100 | |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 101 | if (cpu_pmu != NULL) |
| 102 | id = cpu_pmu->id; |
Will Deacon | 181193f | 2010-04-30 11:32:44 +0100 | [diff] [blame] | 103 | |
| 104 | return id; |
| 105 | } |
| 106 | EXPORT_SYMBOL_GPL(armpmu_get_pmu_id); |
| 107 | |
Will Deacon | 929f519 | 2010-04-30 11:34:26 +0100 | [diff] [blame] | 108 | int |
| 109 | armpmu_get_max_events(void) |
| 110 | { |
| 111 | int max_events = 0; |
| 112 | |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 113 | if (cpu_pmu != NULL) |
| 114 | max_events = cpu_pmu->num_events; |
Will Deacon | 929f519 | 2010-04-30 11:34:26 +0100 | [diff] [blame] | 115 | |
| 116 | return max_events; |
| 117 | } |
| 118 | EXPORT_SYMBOL_GPL(armpmu_get_max_events); |
| 119 | |
Matt Fleming | 3bf101b | 2010-09-27 20:22:24 +0100 | [diff] [blame] | 120 | int perf_num_counters(void) |
| 121 | { |
| 122 | return armpmu_get_max_events(); |
| 123 | } |
| 124 | EXPORT_SYMBOL_GPL(perf_num_counters); |
| 125 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 126 | #define HW_OP_UNSUPPORTED 0xFFFF |
| 127 | |
| 128 | #define C(_x) \ |
| 129 | PERF_COUNT_HW_CACHE_##_x |
| 130 | |
| 131 | #define CACHE_OP_UNSUPPORTED 0xFFFF |
| 132 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 133 | static int |
Mark Rutland | e1f431b | 2011-04-28 15:47:10 +0100 | [diff] [blame] | 134 | armpmu_map_cache_event(const unsigned (*cache_map) |
| 135 | [PERF_COUNT_HW_CACHE_MAX] |
| 136 | [PERF_COUNT_HW_CACHE_OP_MAX] |
| 137 | [PERF_COUNT_HW_CACHE_RESULT_MAX], |
| 138 | u64 config) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 139 | { |
| 140 | unsigned int cache_type, cache_op, cache_result, ret; |
| 141 | |
| 142 | cache_type = (config >> 0) & 0xff; |
| 143 | if (cache_type >= PERF_COUNT_HW_CACHE_MAX) |
| 144 | return -EINVAL; |
| 145 | |
| 146 | cache_op = (config >> 8) & 0xff; |
| 147 | if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX) |
| 148 | return -EINVAL; |
| 149 | |
| 150 | cache_result = (config >> 16) & 0xff; |
| 151 | if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX) |
| 152 | return -EINVAL; |
| 153 | |
Mark Rutland | e1f431b | 2011-04-28 15:47:10 +0100 | [diff] [blame] | 154 | ret = (int)(*cache_map)[cache_type][cache_op][cache_result]; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 155 | |
| 156 | if (ret == CACHE_OP_UNSUPPORTED) |
| 157 | return -ENOENT; |
| 158 | |
| 159 | return ret; |
| 160 | } |
| 161 | |
| 162 | static int |
Mark Rutland | e1f431b | 2011-04-28 15:47:10 +0100 | [diff] [blame] | 163 | armpmu_map_event(const unsigned (*event_map)[PERF_COUNT_HW_MAX], u64 config) |
Will Deacon | 84fee97 | 2010-11-13 17:13:56 +0000 | [diff] [blame] | 164 | { |
Mark Rutland | e1f431b | 2011-04-28 15:47:10 +0100 | [diff] [blame] | 165 | int mapping = (*event_map)[config]; |
| 166 | return mapping == HW_OP_UNSUPPORTED ? -ENOENT : mapping; |
Will Deacon | 84fee97 | 2010-11-13 17:13:56 +0000 | [diff] [blame] | 167 | } |
| 168 | |
| 169 | static int |
Mark Rutland | e1f431b | 2011-04-28 15:47:10 +0100 | [diff] [blame] | 170 | armpmu_map_raw_event(u32 raw_event_mask, u64 config) |
Will Deacon | 84fee97 | 2010-11-13 17:13:56 +0000 | [diff] [blame] | 171 | { |
Mark Rutland | e1f431b | 2011-04-28 15:47:10 +0100 | [diff] [blame] | 172 | return (int)(config & raw_event_mask); |
| 173 | } |
| 174 | |
| 175 | static int map_cpu_event(struct perf_event *event, |
| 176 | const unsigned (*event_map)[PERF_COUNT_HW_MAX], |
| 177 | const unsigned (*cache_map) |
| 178 | [PERF_COUNT_HW_CACHE_MAX] |
| 179 | [PERF_COUNT_HW_CACHE_OP_MAX] |
| 180 | [PERF_COUNT_HW_CACHE_RESULT_MAX], |
| 181 | u32 raw_event_mask) |
| 182 | { |
| 183 | u64 config = event->attr.config; |
| 184 | |
| 185 | switch (event->attr.type) { |
| 186 | case PERF_TYPE_HARDWARE: |
| 187 | return armpmu_map_event(event_map, config); |
| 188 | case PERF_TYPE_HW_CACHE: |
| 189 | return armpmu_map_cache_event(cache_map, config); |
| 190 | case PERF_TYPE_RAW: |
| 191 | return armpmu_map_raw_event(raw_event_mask, config); |
| 192 | } |
| 193 | |
| 194 | return -ENOENT; |
Will Deacon | 84fee97 | 2010-11-13 17:13:56 +0000 | [diff] [blame] | 195 | } |
| 196 | |
| 197 | static int |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 198 | armpmu_event_set_period(struct perf_event *event, |
| 199 | struct hw_perf_event *hwc, |
| 200 | int idx) |
| 201 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 202 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 203 | s64 left = local64_read(&hwc->period_left); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 204 | s64 period = hwc->sample_period; |
| 205 | int ret = 0; |
| 206 | |
| 207 | if (unlikely(left <= -period)) { |
| 208 | left = period; |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 209 | local64_set(&hwc->period_left, left); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 210 | hwc->last_period = period; |
| 211 | ret = 1; |
| 212 | } |
| 213 | |
| 214 | if (unlikely(left <= 0)) { |
| 215 | left += period; |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 216 | local64_set(&hwc->period_left, left); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 217 | hwc->last_period = period; |
| 218 | ret = 1; |
| 219 | } |
| 220 | |
| 221 | if (left > (s64)armpmu->max_period) |
| 222 | left = armpmu->max_period; |
| 223 | |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 224 | local64_set(&hwc->prev_count, (u64)-left); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 225 | |
| 226 | armpmu->write_counter(idx, (u64)(-left) & 0xffffffff); |
| 227 | |
| 228 | perf_event_update_userpage(event); |
| 229 | |
| 230 | return ret; |
| 231 | } |
| 232 | |
| 233 | static u64 |
| 234 | armpmu_event_update(struct perf_event *event, |
| 235 | struct hw_perf_event *hwc, |
Will Deacon | a737823 | 2011-03-25 17:12:37 +0100 | [diff] [blame] | 236 | int idx, int overflow) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 237 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 238 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Will Deacon | a737823 | 2011-03-25 17:12:37 +0100 | [diff] [blame] | 239 | u64 delta, prev_raw_count, new_raw_count; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 240 | |
| 241 | again: |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 242 | prev_raw_count = local64_read(&hwc->prev_count); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 243 | new_raw_count = armpmu->read_counter(idx); |
| 244 | |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 245 | if (local64_cmpxchg(&hwc->prev_count, prev_raw_count, |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 246 | new_raw_count) != prev_raw_count) |
| 247 | goto again; |
| 248 | |
Will Deacon | a737823 | 2011-03-25 17:12:37 +0100 | [diff] [blame] | 249 | new_raw_count &= armpmu->max_period; |
| 250 | prev_raw_count &= armpmu->max_period; |
| 251 | |
| 252 | if (overflow) |
Will Deacon | 6759788 | 2011-04-05 14:01:24 +0100 | [diff] [blame] | 253 | delta = armpmu->max_period - prev_raw_count + new_raw_count + 1; |
Will Deacon | a737823 | 2011-03-25 17:12:37 +0100 | [diff] [blame] | 254 | else |
| 255 | delta = new_raw_count - prev_raw_count; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 256 | |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 257 | local64_add(delta, &event->count); |
| 258 | local64_sub(delta, &hwc->period_left); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 259 | |
| 260 | return new_raw_count; |
| 261 | } |
| 262 | |
| 263 | static void |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 264 | armpmu_read(struct perf_event *event) |
| 265 | { |
| 266 | struct hw_perf_event *hwc = &event->hw; |
| 267 | |
| 268 | /* Don't read disabled counters! */ |
| 269 | if (hwc->idx < 0) |
| 270 | return; |
| 271 | |
Will Deacon | a737823 | 2011-03-25 17:12:37 +0100 | [diff] [blame] | 272 | armpmu_event_update(event, hwc, hwc->idx, 0); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 273 | } |
| 274 | |
| 275 | static void |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 276 | armpmu_stop(struct perf_event *event, int flags) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 277 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 278 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 279 | struct hw_perf_event *hwc = &event->hw; |
| 280 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 281 | /* |
| 282 | * ARM pmu always has to update the counter, so ignore |
| 283 | * PERF_EF_UPDATE, see comments in armpmu_start(). |
| 284 | */ |
| 285 | if (!(hwc->state & PERF_HES_STOPPED)) { |
| 286 | armpmu->disable(hwc, hwc->idx); |
| 287 | barrier(); /* why? */ |
Will Deacon | a737823 | 2011-03-25 17:12:37 +0100 | [diff] [blame] | 288 | armpmu_event_update(event, hwc, hwc->idx, 0); |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 289 | hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE; |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | static void |
| 294 | armpmu_start(struct perf_event *event, int flags) |
| 295 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 296 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 297 | struct hw_perf_event *hwc = &event->hw; |
| 298 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 299 | /* |
| 300 | * ARM pmu always has to reprogram the period, so ignore |
| 301 | * PERF_EF_RELOAD, see the comment below. |
| 302 | */ |
| 303 | if (flags & PERF_EF_RELOAD) |
| 304 | WARN_ON_ONCE(!(hwc->state & PERF_HES_UPTODATE)); |
| 305 | |
| 306 | hwc->state = 0; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 307 | /* |
| 308 | * Set the period again. Some counters can't be stopped, so when we |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 309 | * were stopped we simply disabled the IRQ source and the counter |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 310 | * may have been left counting. If we don't do this step then we may |
| 311 | * get an interrupt too soon or *way* too late if the overflow has |
| 312 | * happened since disabling. |
| 313 | */ |
| 314 | armpmu_event_set_period(event, hwc, hwc->idx); |
| 315 | armpmu->enable(hwc, hwc->idx); |
| 316 | } |
| 317 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 318 | static void |
| 319 | armpmu_del(struct perf_event *event, int flags) |
| 320 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 321 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 322 | struct pmu_hw_events *hw_events = armpmu->get_hw_events(); |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 323 | struct hw_perf_event *hwc = &event->hw; |
| 324 | int idx = hwc->idx; |
| 325 | |
| 326 | WARN_ON(idx < 0); |
| 327 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 328 | armpmu_stop(event, PERF_EF_UPDATE); |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 329 | hw_events->events[idx] = NULL; |
| 330 | clear_bit(idx, hw_events->used_mask); |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 331 | |
| 332 | perf_event_update_userpage(event); |
| 333 | } |
| 334 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 335 | static int |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 336 | armpmu_add(struct perf_event *event, int flags) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 337 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 338 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 339 | struct pmu_hw_events *hw_events = armpmu->get_hw_events(); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 340 | struct hw_perf_event *hwc = &event->hw; |
| 341 | int idx; |
| 342 | int err = 0; |
| 343 | |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 344 | perf_pmu_disable(event->pmu); |
Peter Zijlstra | 24cd7f5 | 2010-06-11 17:32:03 +0200 | [diff] [blame] | 345 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 346 | /* If we don't have a space for the counter then finish early. */ |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 347 | idx = armpmu->get_event_idx(hw_events, hwc); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 348 | if (idx < 0) { |
| 349 | err = idx; |
| 350 | goto out; |
| 351 | } |
| 352 | |
| 353 | /* |
| 354 | * If there is an event in the counter we are going to use then make |
| 355 | * sure it is disabled. |
| 356 | */ |
| 357 | event->hw.idx = idx; |
| 358 | armpmu->disable(hwc, idx); |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 359 | hw_events->events[idx] = event; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 360 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 361 | hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE; |
| 362 | if (flags & PERF_EF_START) |
| 363 | armpmu_start(event, PERF_EF_RELOAD); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 364 | |
| 365 | /* Propagate our changes to the userspace mapping. */ |
| 366 | perf_event_update_userpage(event); |
| 367 | |
| 368 | out: |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 369 | perf_pmu_enable(event->pmu); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 370 | return err; |
| 371 | } |
| 372 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 373 | static int |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 374 | validate_event(struct pmu_hw_events *hw_events, |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 375 | struct perf_event *event) |
| 376 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 377 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 378 | struct hw_perf_event fake_event = event->hw; |
Mark Rutland | 7b9f72c | 2011-04-27 16:22:21 +0100 | [diff] [blame] | 379 | struct pmu *leader_pmu = event->group_leader->pmu; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 380 | |
Mark Rutland | 7b9f72c | 2011-04-27 16:22:21 +0100 | [diff] [blame] | 381 | if (event->pmu != leader_pmu || event->state <= PERF_EVENT_STATE_OFF) |
Will Deacon | 65b4711 | 2010-09-02 09:32:08 +0100 | [diff] [blame] | 382 | return 1; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 383 | |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 384 | return armpmu->get_event_idx(hw_events, &fake_event) >= 0; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 385 | } |
| 386 | |
| 387 | static int |
| 388 | validate_group(struct perf_event *event) |
| 389 | { |
| 390 | struct perf_event *sibling, *leader = event->group_leader; |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 391 | struct pmu_hw_events fake_pmu; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 392 | |
| 393 | memset(&fake_pmu, 0, sizeof(fake_pmu)); |
| 394 | |
| 395 | if (!validate_event(&fake_pmu, leader)) |
| 396 | return -ENOSPC; |
| 397 | |
| 398 | list_for_each_entry(sibling, &leader->sibling_list, group_entry) { |
| 399 | if (!validate_event(&fake_pmu, sibling)) |
| 400 | return -ENOSPC; |
| 401 | } |
| 402 | |
| 403 | if (!validate_event(&fake_pmu, event)) |
| 404 | return -ENOSPC; |
| 405 | |
| 406 | return 0; |
| 407 | } |
| 408 | |
Rabin Vincent | 0e25a5c | 2011-02-08 09:24:36 +0530 | [diff] [blame] | 409 | static irqreturn_t armpmu_platform_irq(int irq, void *dev) |
| 410 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 411 | struct arm_pmu *armpmu = (struct arm_pmu *) dev; |
Mark Rutland | a9356a0 | 2011-05-04 09:23:15 +0100 | [diff] [blame] | 412 | struct platform_device *plat_device = armpmu->plat_device; |
| 413 | struct arm_pmu_platdata *plat = dev_get_platdata(&plat_device->dev); |
Rabin Vincent | 0e25a5c | 2011-02-08 09:24:36 +0530 | [diff] [blame] | 414 | |
| 415 | return plat->handle_irq(irq, dev, armpmu->handle_irq); |
| 416 | } |
| 417 | |
Will Deacon | 0b390e2 | 2011-07-27 15:18:59 +0100 | [diff] [blame] | 418 | static void |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 419 | armpmu_release_hardware(struct arm_pmu *armpmu) |
Will Deacon | 0b390e2 | 2011-07-27 15:18:59 +0100 | [diff] [blame] | 420 | { |
| 421 | int i, irq, irqs; |
Mark Rutland | a9356a0 | 2011-05-04 09:23:15 +0100 | [diff] [blame] | 422 | struct platform_device *pmu_device = armpmu->plat_device; |
Will Deacon | 0b390e2 | 2011-07-27 15:18:59 +0100 | [diff] [blame] | 423 | |
| 424 | irqs = min(pmu_device->num_resources, num_possible_cpus()); |
| 425 | |
| 426 | for (i = 0; i < irqs; ++i) { |
| 427 | if (!cpumask_test_and_clear_cpu(i, &armpmu->active_irqs)) |
| 428 | continue; |
| 429 | irq = platform_get_irq(pmu_device, i); |
| 430 | if (irq >= 0) |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 431 | free_irq(irq, armpmu); |
Will Deacon | 0b390e2 | 2011-07-27 15:18:59 +0100 | [diff] [blame] | 432 | } |
| 433 | |
Mark Rutland | 7ae18a5 | 2011-06-06 10:37:50 +0100 | [diff] [blame] | 434 | release_pmu(armpmu->type); |
Will Deacon | 0b390e2 | 2011-07-27 15:18:59 +0100 | [diff] [blame] | 435 | } |
| 436 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 437 | static int |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 438 | armpmu_reserve_hardware(struct arm_pmu *armpmu) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 439 | { |
Rabin Vincent | 0e25a5c | 2011-02-08 09:24:36 +0530 | [diff] [blame] | 440 | struct arm_pmu_platdata *plat; |
| 441 | irq_handler_t handle_irq; |
Will Deacon | b0e8959 | 2011-07-26 22:10:28 +0100 | [diff] [blame] | 442 | int i, err, irq, irqs; |
Mark Rutland | a9356a0 | 2011-05-04 09:23:15 +0100 | [diff] [blame] | 443 | struct platform_device *pmu_device = armpmu->plat_device; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 444 | |
Mark Rutland | 7ae18a5 | 2011-06-06 10:37:50 +0100 | [diff] [blame] | 445 | err = reserve_pmu(armpmu->type); |
Will Deacon | b0e8959 | 2011-07-26 22:10:28 +0100 | [diff] [blame] | 446 | if (err) { |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 447 | pr_warning("unable to reserve pmu\n"); |
Will Deacon | b0e8959 | 2011-07-26 22:10:28 +0100 | [diff] [blame] | 448 | return err; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 449 | } |
| 450 | |
Rabin Vincent | 0e25a5c | 2011-02-08 09:24:36 +0530 | [diff] [blame] | 451 | plat = dev_get_platdata(&pmu_device->dev); |
| 452 | if (plat && plat->handle_irq) |
| 453 | handle_irq = armpmu_platform_irq; |
| 454 | else |
| 455 | handle_irq = armpmu->handle_irq; |
| 456 | |
Will Deacon | 0b390e2 | 2011-07-27 15:18:59 +0100 | [diff] [blame] | 457 | irqs = min(pmu_device->num_resources, num_possible_cpus()); |
Will Deacon | b0e8959 | 2011-07-26 22:10:28 +0100 | [diff] [blame] | 458 | if (irqs < 1) { |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 459 | pr_err("no irqs for PMUs defined\n"); |
| 460 | return -ENODEV; |
| 461 | } |
| 462 | |
Will Deacon | b0e8959 | 2011-07-26 22:10:28 +0100 | [diff] [blame] | 463 | for (i = 0; i < irqs; ++i) { |
Will Deacon | 0b390e2 | 2011-07-27 15:18:59 +0100 | [diff] [blame] | 464 | err = 0; |
Will Deacon | 49c006b | 2010-04-29 17:13:24 +0100 | [diff] [blame] | 465 | irq = platform_get_irq(pmu_device, i); |
| 466 | if (irq < 0) |
| 467 | continue; |
| 468 | |
Will Deacon | b0e8959 | 2011-07-26 22:10:28 +0100 | [diff] [blame] | 469 | /* |
| 470 | * If we have a single PMU interrupt that we can't shift, |
| 471 | * assume that we're running on a uniprocessor machine and |
Will Deacon | 0b390e2 | 2011-07-27 15:18:59 +0100 | [diff] [blame] | 472 | * continue. Otherwise, continue without this interrupt. |
Will Deacon | b0e8959 | 2011-07-26 22:10:28 +0100 | [diff] [blame] | 473 | */ |
Will Deacon | 0b390e2 | 2011-07-27 15:18:59 +0100 | [diff] [blame] | 474 | if (irq_set_affinity(irq, cpumask_of(i)) && irqs > 1) { |
| 475 | pr_warning("unable to set irq affinity (irq=%d, cpu=%u)\n", |
| 476 | irq, i); |
| 477 | continue; |
Will Deacon | b0e8959 | 2011-07-26 22:10:28 +0100 | [diff] [blame] | 478 | } |
| 479 | |
Rabin Vincent | 0e25a5c | 2011-02-08 09:24:36 +0530 | [diff] [blame] | 480 | err = request_irq(irq, handle_irq, |
Will Deacon | ddee87f | 2010-02-25 15:04:14 +0100 | [diff] [blame] | 481 | IRQF_DISABLED | IRQF_NOBALANCING, |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 482 | "arm-pmu", armpmu); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 483 | if (err) { |
Will Deacon | b0e8959 | 2011-07-26 22:10:28 +0100 | [diff] [blame] | 484 | pr_err("unable to request IRQ%d for ARM PMU counters\n", |
| 485 | irq); |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 486 | armpmu_release_hardware(armpmu); |
Will Deacon | 0b390e2 | 2011-07-27 15:18:59 +0100 | [diff] [blame] | 487 | return err; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 488 | } |
Will Deacon | 0b390e2 | 2011-07-27 15:18:59 +0100 | [diff] [blame] | 489 | |
| 490 | cpumask_set_cpu(i, &armpmu->active_irqs); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 491 | } |
| 492 | |
Will Deacon | 0b390e2 | 2011-07-27 15:18:59 +0100 | [diff] [blame] | 493 | return 0; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 494 | } |
| 495 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 496 | static void |
| 497 | hw_perf_event_destroy(struct perf_event *event) |
| 498 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 499 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Mark Rutland | 03b7898 | 2011-04-27 11:20:11 +0100 | [diff] [blame] | 500 | atomic_t *active_events = &armpmu->active_events; |
| 501 | struct mutex *pmu_reserve_mutex = &armpmu->reserve_mutex; |
| 502 | |
| 503 | if (atomic_dec_and_mutex_lock(active_events, pmu_reserve_mutex)) { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 504 | armpmu_release_hardware(armpmu); |
Mark Rutland | 03b7898 | 2011-04-27 11:20:11 +0100 | [diff] [blame] | 505 | mutex_unlock(pmu_reserve_mutex); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 506 | } |
| 507 | } |
| 508 | |
| 509 | static int |
Will Deacon | 05d22fd | 2011-07-19 11:57:30 +0100 | [diff] [blame] | 510 | event_requires_mode_exclusion(struct perf_event_attr *attr) |
| 511 | { |
| 512 | return attr->exclude_idle || attr->exclude_user || |
| 513 | attr->exclude_kernel || attr->exclude_hv; |
| 514 | } |
| 515 | |
| 516 | static int |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 517 | __hw_perf_event_init(struct perf_event *event) |
| 518 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 519 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 520 | struct hw_perf_event *hwc = &event->hw; |
| 521 | int mapping, err; |
| 522 | |
Mark Rutland | e1f431b | 2011-04-28 15:47:10 +0100 | [diff] [blame] | 523 | mapping = armpmu->map_event(event); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 524 | |
| 525 | if (mapping < 0) { |
| 526 | pr_debug("event %x:%llx not supported\n", event->attr.type, |
| 527 | event->attr.config); |
| 528 | return mapping; |
| 529 | } |
| 530 | |
| 531 | /* |
Will Deacon | 05d22fd | 2011-07-19 11:57:30 +0100 | [diff] [blame] | 532 | * We don't assign an index until we actually place the event onto |
| 533 | * hardware. Use -1 to signify that we haven't decided where to put it |
| 534 | * yet. For SMP systems, each core has it's own PMU so we can't do any |
| 535 | * clever allocation or constraints checking at this point. |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 536 | */ |
Will Deacon | 05d22fd | 2011-07-19 11:57:30 +0100 | [diff] [blame] | 537 | hwc->idx = -1; |
| 538 | hwc->config_base = 0; |
| 539 | hwc->config = 0; |
| 540 | hwc->event_base = 0; |
| 541 | |
| 542 | /* |
| 543 | * Check whether we need to exclude the counter from certain modes. |
| 544 | */ |
| 545 | if ((!armpmu->set_event_filter || |
| 546 | armpmu->set_event_filter(hwc, &event->attr)) && |
| 547 | event_requires_mode_exclusion(&event->attr)) { |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 548 | pr_debug("ARM performance counters do not support " |
| 549 | "mode exclusion\n"); |
| 550 | return -EPERM; |
| 551 | } |
| 552 | |
| 553 | /* |
Will Deacon | 05d22fd | 2011-07-19 11:57:30 +0100 | [diff] [blame] | 554 | * Store the event encoding into the config_base field. |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 555 | */ |
Will Deacon | 05d22fd | 2011-07-19 11:57:30 +0100 | [diff] [blame] | 556 | hwc->config_base |= (unsigned long)mapping; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 557 | |
| 558 | if (!hwc->sample_period) { |
| 559 | hwc->sample_period = armpmu->max_period; |
| 560 | hwc->last_period = hwc->sample_period; |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 561 | local64_set(&hwc->period_left, hwc->sample_period); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 562 | } |
| 563 | |
| 564 | err = 0; |
| 565 | if (event->group_leader != event) { |
| 566 | err = validate_group(event); |
| 567 | if (err) |
| 568 | return -EINVAL; |
| 569 | } |
| 570 | |
| 571 | return err; |
| 572 | } |
| 573 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 574 | static int armpmu_event_init(struct perf_event *event) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 575 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 576 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 577 | int err = 0; |
Mark Rutland | 03b7898 | 2011-04-27 11:20:11 +0100 | [diff] [blame] | 578 | atomic_t *active_events = &armpmu->active_events; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 579 | |
Mark Rutland | e1f431b | 2011-04-28 15:47:10 +0100 | [diff] [blame] | 580 | if (armpmu->map_event(event) == -ENOENT) |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 581 | return -ENOENT; |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 582 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 583 | event->destroy = hw_perf_event_destroy; |
| 584 | |
Mark Rutland | 03b7898 | 2011-04-27 11:20:11 +0100 | [diff] [blame] | 585 | if (!atomic_inc_not_zero(active_events)) { |
| 586 | mutex_lock(&armpmu->reserve_mutex); |
| 587 | if (atomic_read(active_events) == 0) |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 588 | err = armpmu_reserve_hardware(armpmu); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 589 | |
| 590 | if (!err) |
Mark Rutland | 03b7898 | 2011-04-27 11:20:11 +0100 | [diff] [blame] | 591 | atomic_inc(active_events); |
| 592 | mutex_unlock(&armpmu->reserve_mutex); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 593 | } |
| 594 | |
| 595 | if (err) |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 596 | return err; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 597 | |
| 598 | err = __hw_perf_event_init(event); |
| 599 | if (err) |
| 600 | hw_perf_event_destroy(event); |
| 601 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 602 | return err; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 603 | } |
| 604 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 605 | static void armpmu_enable(struct pmu *pmu) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 606 | { |
| 607 | /* Enable all of the perf events on hardware. */ |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 608 | struct arm_pmu *armpmu = to_arm_pmu(pmu); |
Will Deacon | f4f3843 | 2011-07-01 14:38:12 +0100 | [diff] [blame] | 609 | int idx, enabled = 0; |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 610 | struct pmu_hw_events *hw_events = armpmu->get_hw_events(); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 611 | |
Will Deacon | ecf5a89 | 2011-07-19 22:43:28 +0100 | [diff] [blame] | 612 | for (idx = 0; idx < armpmu->num_events; ++idx) { |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 613 | struct perf_event *event = hw_events->events[idx]; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 614 | |
| 615 | if (!event) |
| 616 | continue; |
| 617 | |
| 618 | armpmu->enable(&event->hw, idx); |
Will Deacon | f4f3843 | 2011-07-01 14:38:12 +0100 | [diff] [blame] | 619 | enabled = 1; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 620 | } |
| 621 | |
Will Deacon | f4f3843 | 2011-07-01 14:38:12 +0100 | [diff] [blame] | 622 | if (enabled) |
| 623 | armpmu->start(); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 624 | } |
| 625 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 626 | static void armpmu_disable(struct pmu *pmu) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 627 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 628 | struct arm_pmu *armpmu = to_arm_pmu(pmu); |
Mark Rutland | 4895715 | 2011-04-27 10:31:51 +0100 | [diff] [blame] | 629 | armpmu->stop(); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 630 | } |
| 631 | |
Mark Rutland | 03b7898 | 2011-04-27 11:20:11 +0100 | [diff] [blame] | 632 | static void __init armpmu_init(struct arm_pmu *armpmu) |
| 633 | { |
| 634 | atomic_set(&armpmu->active_events, 0); |
| 635 | mutex_init(&armpmu->reserve_mutex); |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 636 | |
| 637 | armpmu->pmu = (struct pmu) { |
| 638 | .pmu_enable = armpmu_enable, |
| 639 | .pmu_disable = armpmu_disable, |
| 640 | .event_init = armpmu_event_init, |
| 641 | .add = armpmu_add, |
| 642 | .del = armpmu_del, |
| 643 | .start = armpmu_start, |
| 644 | .stop = armpmu_stop, |
| 645 | .read = armpmu_read, |
| 646 | }; |
| 647 | } |
| 648 | |
| 649 | static int __init armpmu_register(struct arm_pmu *armpmu, char *name, int type) |
| 650 | { |
| 651 | armpmu_init(armpmu); |
| 652 | return perf_pmu_register(&armpmu->pmu, name, type); |
Mark Rutland | 03b7898 | 2011-04-27 11:20:11 +0100 | [diff] [blame] | 653 | } |
| 654 | |
Will Deacon | 43eab87 | 2010-11-13 19:04:32 +0000 | [diff] [blame] | 655 | /* Include the PMU-specific implementations. */ |
| 656 | #include "perf_event_xscale.c" |
| 657 | #include "perf_event_v6.c" |
| 658 | #include "perf_event_v7.c" |
Will Deacon | 49e6a32 | 2010-04-30 11:33:33 +0100 | [diff] [blame] | 659 | |
Will Deacon | 574b69c | 2011-03-25 13:13:34 +0100 | [diff] [blame] | 660 | /* |
| 661 | * Ensure the PMU has sane values out of reset. |
| 662 | * This requires SMP to be available, so exists as a separate initcall. |
| 663 | */ |
| 664 | static int __init |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 665 | cpu_pmu_reset(void) |
Will Deacon | 574b69c | 2011-03-25 13:13:34 +0100 | [diff] [blame] | 666 | { |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 667 | if (cpu_pmu && cpu_pmu->reset) |
| 668 | return on_each_cpu(cpu_pmu->reset, NULL, 1); |
Will Deacon | 574b69c | 2011-03-25 13:13:34 +0100 | [diff] [blame] | 669 | return 0; |
| 670 | } |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 671 | arch_initcall(cpu_pmu_reset); |
Will Deacon | 574b69c | 2011-03-25 13:13:34 +0100 | [diff] [blame] | 672 | |
Will Deacon | b0e8959 | 2011-07-26 22:10:28 +0100 | [diff] [blame] | 673 | /* |
| 674 | * PMU platform driver and devicetree bindings. |
| 675 | */ |
| 676 | static struct of_device_id armpmu_of_device_ids[] = { |
| 677 | {.compatible = "arm,cortex-a9-pmu"}, |
| 678 | {.compatible = "arm,cortex-a8-pmu"}, |
| 679 | {.compatible = "arm,arm1136-pmu"}, |
| 680 | {.compatible = "arm,arm1176-pmu"}, |
| 681 | {}, |
| 682 | }; |
| 683 | |
| 684 | static struct platform_device_id armpmu_plat_device_ids[] = { |
| 685 | {.name = "arm-pmu"}, |
| 686 | {}, |
| 687 | }; |
| 688 | |
| 689 | static int __devinit armpmu_device_probe(struct platform_device *pdev) |
| 690 | { |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 691 | cpu_pmu->plat_device = pdev; |
Will Deacon | b0e8959 | 2011-07-26 22:10:28 +0100 | [diff] [blame] | 692 | return 0; |
| 693 | } |
| 694 | |
| 695 | static struct platform_driver armpmu_driver = { |
| 696 | .driver = { |
| 697 | .name = "arm-pmu", |
| 698 | .of_match_table = armpmu_of_device_ids, |
| 699 | }, |
| 700 | .probe = armpmu_device_probe, |
| 701 | .id_table = armpmu_plat_device_ids, |
| 702 | }; |
| 703 | |
| 704 | static int __init register_pmu_driver(void) |
| 705 | { |
| 706 | return platform_driver_register(&armpmu_driver); |
| 707 | } |
| 708 | device_initcall(register_pmu_driver); |
| 709 | |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 710 | static struct pmu_hw_events *armpmu_get_cpu_events(void) |
Mark Rutland | 92f701e | 2011-05-04 09:23:51 +0100 | [diff] [blame] | 711 | { |
| 712 | return &__get_cpu_var(cpu_hw_events); |
| 713 | } |
| 714 | |
| 715 | static void __init cpu_pmu_init(struct arm_pmu *armpmu) |
| 716 | { |
Mark Rutland | 0f78d2d | 2011-04-28 10:17:04 +0100 | [diff] [blame] | 717 | int cpu; |
| 718 | for_each_possible_cpu(cpu) { |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 719 | struct pmu_hw_events *events = &per_cpu(cpu_hw_events, cpu); |
Mark Rutland | 3fc2c83 | 2011-06-24 11:30:59 +0100 | [diff] [blame] | 720 | events->events = per_cpu(hw_events, cpu); |
| 721 | events->used_mask = per_cpu(used_mask, cpu); |
Mark Rutland | 0f78d2d | 2011-04-28 10:17:04 +0100 | [diff] [blame] | 722 | raw_spin_lock_init(&events->pmu_lock); |
| 723 | } |
Mark Rutland | 92f701e | 2011-05-04 09:23:51 +0100 | [diff] [blame] | 724 | armpmu->get_hw_events = armpmu_get_cpu_events; |
Mark Rutland | 7ae18a5 | 2011-06-06 10:37:50 +0100 | [diff] [blame] | 725 | armpmu->type = ARM_PMU_DEVICE_CPU; |
Mark Rutland | 92f701e | 2011-05-04 09:23:51 +0100 | [diff] [blame] | 726 | } |
| 727 | |
Will Deacon | b0e8959 | 2011-07-26 22:10:28 +0100 | [diff] [blame] | 728 | /* |
| 729 | * CPU PMU identification and registration. |
| 730 | */ |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 731 | static int __init |
| 732 | init_hw_perf_events(void) |
| 733 | { |
| 734 | unsigned long cpuid = read_cpuid_id(); |
| 735 | unsigned long implementor = (cpuid & 0xFF000000) >> 24; |
| 736 | unsigned long part_number = (cpuid & 0xFFF0); |
| 737 | |
Will Deacon | 49e6a32 | 2010-04-30 11:33:33 +0100 | [diff] [blame] | 738 | /* ARM Ltd CPUs. */ |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 739 | if (0x41 == implementor) { |
| 740 | switch (part_number) { |
| 741 | case 0xB360: /* ARM1136 */ |
| 742 | case 0xB560: /* ARM1156 */ |
| 743 | case 0xB760: /* ARM1176 */ |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 744 | cpu_pmu = armv6pmu_init(); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 745 | break; |
| 746 | case 0xB020: /* ARM11mpcore */ |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 747 | cpu_pmu = armv6mpcore_pmu_init(); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 748 | break; |
Jean PIHET | 796d129 | 2010-01-26 18:51:05 +0100 | [diff] [blame] | 749 | case 0xC080: /* Cortex-A8 */ |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 750 | cpu_pmu = armv7_a8_pmu_init(); |
Jean PIHET | 796d129 | 2010-01-26 18:51:05 +0100 | [diff] [blame] | 751 | break; |
| 752 | case 0xC090: /* Cortex-A9 */ |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 753 | cpu_pmu = armv7_a9_pmu_init(); |
Jean PIHET | 796d129 | 2010-01-26 18:51:05 +0100 | [diff] [blame] | 754 | break; |
Will Deacon | 0c205cb | 2011-06-03 17:40:15 +0100 | [diff] [blame] | 755 | case 0xC050: /* Cortex-A5 */ |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 756 | cpu_pmu = armv7_a5_pmu_init(); |
Will Deacon | 0c205cb | 2011-06-03 17:40:15 +0100 | [diff] [blame] | 757 | break; |
Will Deacon | 14abd03 | 2011-01-19 14:24:38 +0000 | [diff] [blame] | 758 | case 0xC0F0: /* Cortex-A15 */ |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 759 | cpu_pmu = armv7_a15_pmu_init(); |
Will Deacon | 14abd03 | 2011-01-19 14:24:38 +0000 | [diff] [blame] | 760 | break; |
Will Deacon | 49e6a32 | 2010-04-30 11:33:33 +0100 | [diff] [blame] | 761 | } |
| 762 | /* Intel CPUs [xscale]. */ |
| 763 | } else if (0x69 == implementor) { |
| 764 | part_number = (cpuid >> 13) & 0x7; |
| 765 | switch (part_number) { |
| 766 | case 1: |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 767 | cpu_pmu = xscale1pmu_init(); |
Will Deacon | 49e6a32 | 2010-04-30 11:33:33 +0100 | [diff] [blame] | 768 | break; |
| 769 | case 2: |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 770 | cpu_pmu = xscale2pmu_init(); |
Will Deacon | 49e6a32 | 2010-04-30 11:33:33 +0100 | [diff] [blame] | 771 | break; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 772 | } |
| 773 | } |
| 774 | |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 775 | if (cpu_pmu) { |
Jean PIHET | 796d129 | 2010-01-26 18:51:05 +0100 | [diff] [blame] | 776 | pr_info("enabled with %s PMU driver, %d counters available\n", |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame^] | 777 | cpu_pmu->name, cpu_pmu->num_events); |
| 778 | cpu_pmu_init(cpu_pmu); |
| 779 | armpmu_register(cpu_pmu, "cpu", PERF_TYPE_RAW); |
Will Deacon | 49e6a32 | 2010-04-30 11:33:33 +0100 | [diff] [blame] | 780 | } else { |
| 781 | pr_info("no hardware support available\n"); |
Will Deacon | 49e6a32 | 2010-04-30 11:33:33 +0100 | [diff] [blame] | 782 | } |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 783 | |
| 784 | return 0; |
| 785 | } |
Peter Zijlstra | 004417a | 2010-11-25 18:38:29 +0100 | [diff] [blame] | 786 | early_initcall(init_hw_perf_events); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 787 | |
| 788 | /* |
| 789 | * Callchain handling code. |
| 790 | */ |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 791 | |
| 792 | /* |
| 793 | * The registers we're interested in are at the end of the variable |
| 794 | * length saved register structure. The fp points at the end of this |
| 795 | * structure so the address of this struct is: |
| 796 | * (struct frame_tail *)(xxx->fp)-1 |
| 797 | * |
| 798 | * This code has been adapted from the ARM OProfile support. |
| 799 | */ |
| 800 | struct frame_tail { |
Will Deacon | 4d6b7a7 | 2010-11-30 18:15:53 +0100 | [diff] [blame] | 801 | struct frame_tail __user *fp; |
| 802 | unsigned long sp; |
| 803 | unsigned long lr; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 804 | } __attribute__((packed)); |
| 805 | |
| 806 | /* |
| 807 | * Get the return address for a single stackframe and return a pointer to the |
| 808 | * next frame tail. |
| 809 | */ |
Will Deacon | 4d6b7a7 | 2010-11-30 18:15:53 +0100 | [diff] [blame] | 810 | static struct frame_tail __user * |
| 811 | user_backtrace(struct frame_tail __user *tail, |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 812 | struct perf_callchain_entry *entry) |
| 813 | { |
| 814 | struct frame_tail buftail; |
| 815 | |
| 816 | /* Also check accessibility of one struct frame_tail beyond */ |
| 817 | if (!access_ok(VERIFY_READ, tail, sizeof(buftail))) |
| 818 | return NULL; |
| 819 | if (__copy_from_user_inatomic(&buftail, tail, sizeof(buftail))) |
| 820 | return NULL; |
| 821 | |
Frederic Weisbecker | 70791ce | 2010-06-29 19:34:05 +0200 | [diff] [blame] | 822 | perf_callchain_store(entry, buftail.lr); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 823 | |
| 824 | /* |
| 825 | * Frame pointers should strictly progress back up the stack |
| 826 | * (towards higher addresses). |
| 827 | */ |
Rabin Vincent | cb06199 | 2011-02-09 11:35:12 +0100 | [diff] [blame] | 828 | if (tail + 1 >= buftail.fp) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 829 | return NULL; |
| 830 | |
| 831 | return buftail.fp - 1; |
| 832 | } |
| 833 | |
Frederic Weisbecker | 56962b444 | 2010-06-30 23:03:51 +0200 | [diff] [blame] | 834 | void |
| 835 | perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 836 | { |
Will Deacon | 4d6b7a7 | 2010-11-30 18:15:53 +0100 | [diff] [blame] | 837 | struct frame_tail __user *tail; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 838 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 839 | |
Will Deacon | 4d6b7a7 | 2010-11-30 18:15:53 +0100 | [diff] [blame] | 840 | tail = (struct frame_tail __user *)regs->ARM_fp - 1; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 841 | |
Sonny Rao | 860ad78 | 2011-04-18 22:12:59 +0100 | [diff] [blame] | 842 | while ((entry->nr < PERF_MAX_STACK_DEPTH) && |
| 843 | tail && !((unsigned long)tail & 0x3)) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 844 | tail = user_backtrace(tail, entry); |
| 845 | } |
| 846 | |
| 847 | /* |
| 848 | * Gets called by walk_stackframe() for every stackframe. This will be called |
| 849 | * whist unwinding the stackframe and is like a subroutine return so we use |
| 850 | * the PC. |
| 851 | */ |
| 852 | static int |
| 853 | callchain_trace(struct stackframe *fr, |
| 854 | void *data) |
| 855 | { |
| 856 | struct perf_callchain_entry *entry = data; |
Frederic Weisbecker | 70791ce | 2010-06-29 19:34:05 +0200 | [diff] [blame] | 857 | perf_callchain_store(entry, fr->pc); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 858 | return 0; |
| 859 | } |
| 860 | |
Frederic Weisbecker | 56962b444 | 2010-06-30 23:03:51 +0200 | [diff] [blame] | 861 | void |
| 862 | perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 863 | { |
| 864 | struct stackframe fr; |
| 865 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 866 | fr.fp = regs->ARM_fp; |
| 867 | fr.sp = regs->ARM_sp; |
| 868 | fr.lr = regs->ARM_lr; |
| 869 | fr.pc = regs->ARM_pc; |
| 870 | walk_stackframe(&fr, callchain_trace, entry); |
| 871 | } |