Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 1 | /* |
Joerg Roedel | bf3118c | 2009-11-20 13:39:19 +0100 | [diff] [blame] | 2 | * Copyright (C) 2007-2009 Advanced Micro Devices, Inc. |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 3 | * Author: Joerg Roedel <joerg.roedel@amd.com> |
| 4 | * Leo Duran <leo.duran@amd.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License version 2 as published |
| 8 | * by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | |
| 20 | #include <linux/pci.h> |
| 21 | #include <linux/gfp.h> |
| 22 | #include <linux/bitops.h> |
Joerg Roedel | 7f26508 | 2008-12-12 13:50:21 +0100 | [diff] [blame] | 23 | #include <linux/debugfs.h> |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 24 | #include <linux/scatterlist.h> |
FUJITA Tomonori | 5149136 | 2009-01-05 23:47:25 +0900 | [diff] [blame] | 25 | #include <linux/dma-mapping.h> |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 26 | #include <linux/iommu-helper.h> |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 27 | #include <linux/iommu.h> |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 28 | #include <asm/proto.h> |
FUJITA Tomonori | 46a7fa2 | 2008-07-11 10:23:42 +0900 | [diff] [blame] | 29 | #include <asm/iommu.h> |
Joerg Roedel | 1d9b16d | 2008-11-27 18:39:15 +0100 | [diff] [blame] | 30 | #include <asm/gart.h> |
Joerg Roedel | 6a9401a | 2009-11-20 13:22:21 +0100 | [diff] [blame] | 31 | #include <asm/amd_iommu_proto.h> |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 32 | #include <asm/amd_iommu_types.h> |
Joerg Roedel | c6da992 | 2008-06-26 21:28:06 +0200 | [diff] [blame] | 33 | #include <asm/amd_iommu.h> |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 34 | |
| 35 | #define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28)) |
| 36 | |
Joerg Roedel | 136f78a | 2008-07-11 17:14:27 +0200 | [diff] [blame] | 37 | #define EXIT_LOOP_COUNT 10000000 |
| 38 | |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 39 | static DEFINE_RWLOCK(amd_iommu_devtable_lock); |
| 40 | |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 41 | /* A list of preallocated protection domains */ |
| 42 | static LIST_HEAD(iommu_pd_list); |
| 43 | static DEFINE_SPINLOCK(iommu_pd_list_lock); |
| 44 | |
Joerg Roedel | 0feae53 | 2009-08-26 15:26:30 +0200 | [diff] [blame] | 45 | /* |
| 46 | * Domain for untranslated devices - only allocated |
| 47 | * if iommu=pt passed on kernel cmd line. |
| 48 | */ |
| 49 | static struct protection_domain *pt_domain; |
| 50 | |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 51 | static struct iommu_ops amd_iommu_ops; |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 52 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 53 | /* |
| 54 | * general struct to manage commands send to an IOMMU |
| 55 | */ |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 56 | struct iommu_cmd { |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 57 | u32 data[4]; |
| 58 | }; |
| 59 | |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 60 | static int dma_ops_unity_map(struct dma_ops_domain *dma_dom, |
| 61 | struct unity_map_entry *e); |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 62 | static struct dma_ops_domain *find_protection_domain(u16 devid); |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 63 | static u64 *alloc_pte(struct protection_domain *domain, |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 64 | unsigned long address, int end_lvl, |
| 65 | u64 **pte_page, gfp_t gfp); |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 66 | static void dma_ops_reserve_addresses(struct dma_ops_domain *dom, |
| 67 | unsigned long start_page, |
| 68 | unsigned int pages); |
Joerg Roedel | a345b23 | 2009-09-03 15:01:43 +0200 | [diff] [blame] | 69 | static void reset_iommu_command_buffer(struct amd_iommu *iommu); |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 70 | static u64 *fetch_pte(struct protection_domain *domain, |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 71 | unsigned long address, int map_size); |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 72 | static void update_domain(struct protection_domain *domain); |
Chris Wright | c1eee67 | 2009-05-21 00:56:58 -0700 | [diff] [blame] | 73 | |
Joerg Roedel | 7f26508 | 2008-12-12 13:50:21 +0100 | [diff] [blame] | 74 | #ifdef CONFIG_AMD_IOMMU_STATS |
| 75 | |
| 76 | /* |
| 77 | * Initialization code for statistics collection |
| 78 | */ |
| 79 | |
Joerg Roedel | da49f6d | 2008-12-12 14:59:58 +0100 | [diff] [blame] | 80 | DECLARE_STATS_COUNTER(compl_wait); |
Joerg Roedel | 0f2a86f | 2008-12-12 15:05:16 +0100 | [diff] [blame] | 81 | DECLARE_STATS_COUNTER(cnt_map_single); |
Joerg Roedel | 146a691 | 2008-12-12 15:07:12 +0100 | [diff] [blame] | 82 | DECLARE_STATS_COUNTER(cnt_unmap_single); |
Joerg Roedel | d03f067a | 2008-12-12 15:09:48 +0100 | [diff] [blame] | 83 | DECLARE_STATS_COUNTER(cnt_map_sg); |
Joerg Roedel | 55877a6 | 2008-12-12 15:12:14 +0100 | [diff] [blame] | 84 | DECLARE_STATS_COUNTER(cnt_unmap_sg); |
Joerg Roedel | c8f0fb3 | 2008-12-12 15:14:21 +0100 | [diff] [blame] | 85 | DECLARE_STATS_COUNTER(cnt_alloc_coherent); |
Joerg Roedel | 5d31ee7 | 2008-12-12 15:16:38 +0100 | [diff] [blame] | 86 | DECLARE_STATS_COUNTER(cnt_free_coherent); |
Joerg Roedel | c185897 | 2008-12-12 15:42:39 +0100 | [diff] [blame] | 87 | DECLARE_STATS_COUNTER(cross_page); |
Joerg Roedel | f57d98a | 2008-12-12 15:46:29 +0100 | [diff] [blame] | 88 | DECLARE_STATS_COUNTER(domain_flush_single); |
Joerg Roedel | 18811f5 | 2008-12-12 15:48:28 +0100 | [diff] [blame] | 89 | DECLARE_STATS_COUNTER(domain_flush_all); |
Joerg Roedel | 5774f7c | 2008-12-12 15:57:30 +0100 | [diff] [blame] | 90 | DECLARE_STATS_COUNTER(alloced_io_mem); |
Joerg Roedel | 8ecaf8f | 2008-12-12 16:13:04 +0100 | [diff] [blame] | 91 | DECLARE_STATS_COUNTER(total_map_requests); |
Joerg Roedel | da49f6d | 2008-12-12 14:59:58 +0100 | [diff] [blame] | 92 | |
Joerg Roedel | 7f26508 | 2008-12-12 13:50:21 +0100 | [diff] [blame] | 93 | static struct dentry *stats_dir; |
| 94 | static struct dentry *de_isolate; |
| 95 | static struct dentry *de_fflush; |
| 96 | |
| 97 | static void amd_iommu_stats_add(struct __iommu_counter *cnt) |
| 98 | { |
| 99 | if (stats_dir == NULL) |
| 100 | return; |
| 101 | |
| 102 | cnt->dent = debugfs_create_u64(cnt->name, 0444, stats_dir, |
| 103 | &cnt->value); |
| 104 | } |
| 105 | |
| 106 | static void amd_iommu_stats_init(void) |
| 107 | { |
| 108 | stats_dir = debugfs_create_dir("amd-iommu", NULL); |
| 109 | if (stats_dir == NULL) |
| 110 | return; |
| 111 | |
| 112 | de_isolate = debugfs_create_bool("isolation", 0444, stats_dir, |
| 113 | (u32 *)&amd_iommu_isolate); |
| 114 | |
| 115 | de_fflush = debugfs_create_bool("fullflush", 0444, stats_dir, |
| 116 | (u32 *)&amd_iommu_unmap_flush); |
Joerg Roedel | da49f6d | 2008-12-12 14:59:58 +0100 | [diff] [blame] | 117 | |
| 118 | amd_iommu_stats_add(&compl_wait); |
Joerg Roedel | 0f2a86f | 2008-12-12 15:05:16 +0100 | [diff] [blame] | 119 | amd_iommu_stats_add(&cnt_map_single); |
Joerg Roedel | 146a691 | 2008-12-12 15:07:12 +0100 | [diff] [blame] | 120 | amd_iommu_stats_add(&cnt_unmap_single); |
Joerg Roedel | d03f067a | 2008-12-12 15:09:48 +0100 | [diff] [blame] | 121 | amd_iommu_stats_add(&cnt_map_sg); |
Joerg Roedel | 55877a6 | 2008-12-12 15:12:14 +0100 | [diff] [blame] | 122 | amd_iommu_stats_add(&cnt_unmap_sg); |
Joerg Roedel | c8f0fb3 | 2008-12-12 15:14:21 +0100 | [diff] [blame] | 123 | amd_iommu_stats_add(&cnt_alloc_coherent); |
Joerg Roedel | 5d31ee7 | 2008-12-12 15:16:38 +0100 | [diff] [blame] | 124 | amd_iommu_stats_add(&cnt_free_coherent); |
Joerg Roedel | c185897 | 2008-12-12 15:42:39 +0100 | [diff] [blame] | 125 | amd_iommu_stats_add(&cross_page); |
Joerg Roedel | f57d98a | 2008-12-12 15:46:29 +0100 | [diff] [blame] | 126 | amd_iommu_stats_add(&domain_flush_single); |
Joerg Roedel | 18811f5 | 2008-12-12 15:48:28 +0100 | [diff] [blame] | 127 | amd_iommu_stats_add(&domain_flush_all); |
Joerg Roedel | 5774f7c | 2008-12-12 15:57:30 +0100 | [diff] [blame] | 128 | amd_iommu_stats_add(&alloced_io_mem); |
Joerg Roedel | 8ecaf8f | 2008-12-12 16:13:04 +0100 | [diff] [blame] | 129 | amd_iommu_stats_add(&total_map_requests); |
Joerg Roedel | 7f26508 | 2008-12-12 13:50:21 +0100 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | #endif |
| 133 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 134 | /**************************************************************************** |
| 135 | * |
Joerg Roedel | a80dc3e | 2008-09-11 16:51:41 +0200 | [diff] [blame] | 136 | * Interrupt handling functions |
| 137 | * |
| 138 | ****************************************************************************/ |
| 139 | |
Joerg Roedel | e3e5987 | 2009-09-03 14:02:10 +0200 | [diff] [blame] | 140 | static void dump_dte_entry(u16 devid) |
| 141 | { |
| 142 | int i; |
| 143 | |
| 144 | for (i = 0; i < 8; ++i) |
| 145 | pr_err("AMD-Vi: DTE[%d]: %08x\n", i, |
| 146 | amd_iommu_dev_table[devid].data[i]); |
| 147 | } |
| 148 | |
Joerg Roedel | 945b4ac | 2009-09-03 14:25:02 +0200 | [diff] [blame] | 149 | static void dump_command(unsigned long phys_addr) |
| 150 | { |
| 151 | struct iommu_cmd *cmd = phys_to_virt(phys_addr); |
| 152 | int i; |
| 153 | |
| 154 | for (i = 0; i < 4; ++i) |
| 155 | pr_err("AMD-Vi: CMD[%d]: %08x\n", i, cmd->data[i]); |
| 156 | } |
| 157 | |
Joerg Roedel | a345b23 | 2009-09-03 15:01:43 +0200 | [diff] [blame] | 158 | static void iommu_print_event(struct amd_iommu *iommu, void *__evt) |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 159 | { |
| 160 | u32 *event = __evt; |
| 161 | int type = (event[1] >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK; |
| 162 | int devid = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK; |
| 163 | int domid = (event[1] >> EVENT_DOMID_SHIFT) & EVENT_DOMID_MASK; |
| 164 | int flags = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK; |
| 165 | u64 address = (u64)(((u64)event[3]) << 32) | event[2]; |
| 166 | |
Joerg Roedel | 4c6f40d | 2009-09-01 16:43:58 +0200 | [diff] [blame] | 167 | printk(KERN_ERR "AMD-Vi: Event logged ["); |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 168 | |
| 169 | switch (type) { |
| 170 | case EVENT_TYPE_ILL_DEV: |
| 171 | printk("ILLEGAL_DEV_TABLE_ENTRY device=%02x:%02x.%x " |
| 172 | "address=0x%016llx flags=0x%04x]\n", |
| 173 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 174 | address, flags); |
Joerg Roedel | e3e5987 | 2009-09-03 14:02:10 +0200 | [diff] [blame] | 175 | dump_dte_entry(devid); |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 176 | break; |
| 177 | case EVENT_TYPE_IO_FAULT: |
| 178 | printk("IO_PAGE_FAULT device=%02x:%02x.%x " |
| 179 | "domain=0x%04x address=0x%016llx flags=0x%04x]\n", |
| 180 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 181 | domid, address, flags); |
| 182 | break; |
| 183 | case EVENT_TYPE_DEV_TAB_ERR: |
| 184 | printk("DEV_TAB_HARDWARE_ERROR device=%02x:%02x.%x " |
| 185 | "address=0x%016llx flags=0x%04x]\n", |
| 186 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 187 | address, flags); |
| 188 | break; |
| 189 | case EVENT_TYPE_PAGE_TAB_ERR: |
| 190 | printk("PAGE_TAB_HARDWARE_ERROR device=%02x:%02x.%x " |
| 191 | "domain=0x%04x address=0x%016llx flags=0x%04x]\n", |
| 192 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 193 | domid, address, flags); |
| 194 | break; |
| 195 | case EVENT_TYPE_ILL_CMD: |
| 196 | printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address); |
Joerg Roedel | a345b23 | 2009-09-03 15:01:43 +0200 | [diff] [blame] | 197 | reset_iommu_command_buffer(iommu); |
Joerg Roedel | 945b4ac | 2009-09-03 14:25:02 +0200 | [diff] [blame] | 198 | dump_command(address); |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 199 | break; |
| 200 | case EVENT_TYPE_CMD_HARD_ERR: |
| 201 | printk("COMMAND_HARDWARE_ERROR address=0x%016llx " |
| 202 | "flags=0x%04x]\n", address, flags); |
| 203 | break; |
| 204 | case EVENT_TYPE_IOTLB_INV_TO: |
| 205 | printk("IOTLB_INV_TIMEOUT device=%02x:%02x.%x " |
| 206 | "address=0x%016llx]\n", |
| 207 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 208 | address); |
| 209 | break; |
| 210 | case EVENT_TYPE_INV_DEV_REQ: |
| 211 | printk("INVALID_DEVICE_REQUEST device=%02x:%02x.%x " |
| 212 | "address=0x%016llx flags=0x%04x]\n", |
| 213 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 214 | address, flags); |
| 215 | break; |
| 216 | default: |
| 217 | printk(KERN_ERR "UNKNOWN type=0x%02x]\n", type); |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | static void iommu_poll_events(struct amd_iommu *iommu) |
| 222 | { |
| 223 | u32 head, tail; |
| 224 | unsigned long flags; |
| 225 | |
| 226 | spin_lock_irqsave(&iommu->lock, flags); |
| 227 | |
| 228 | head = readl(iommu->mmio_base + MMIO_EVT_HEAD_OFFSET); |
| 229 | tail = readl(iommu->mmio_base + MMIO_EVT_TAIL_OFFSET); |
| 230 | |
| 231 | while (head != tail) { |
Joerg Roedel | a345b23 | 2009-09-03 15:01:43 +0200 | [diff] [blame] | 232 | iommu_print_event(iommu, iommu->evt_buf + head); |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 233 | head = (head + EVENT_ENTRY_SIZE) % iommu->evt_buf_size; |
| 234 | } |
| 235 | |
| 236 | writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET); |
| 237 | |
| 238 | spin_unlock_irqrestore(&iommu->lock, flags); |
| 239 | } |
| 240 | |
Joerg Roedel | a80dc3e | 2008-09-11 16:51:41 +0200 | [diff] [blame] | 241 | irqreturn_t amd_iommu_int_handler(int irq, void *data) |
| 242 | { |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 243 | struct amd_iommu *iommu; |
| 244 | |
Joerg Roedel | 3bd2217 | 2009-05-04 15:06:20 +0200 | [diff] [blame] | 245 | for_each_iommu(iommu) |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 246 | iommu_poll_events(iommu); |
| 247 | |
| 248 | return IRQ_HANDLED; |
Joerg Roedel | a80dc3e | 2008-09-11 16:51:41 +0200 | [diff] [blame] | 249 | } |
| 250 | |
| 251 | /**************************************************************************** |
| 252 | * |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 253 | * IOMMU command queuing functions |
| 254 | * |
| 255 | ****************************************************************************/ |
| 256 | |
| 257 | /* |
| 258 | * Writes the command to the IOMMUs command buffer and informs the |
| 259 | * hardware about the new command. Must be called with iommu->lock held. |
| 260 | */ |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 261 | static int __iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd) |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 262 | { |
| 263 | u32 tail, head; |
| 264 | u8 *target; |
| 265 | |
| 266 | tail = readl(iommu->mmio_base + MMIO_CMD_TAIL_OFFSET); |
Jiri Kosina | 8a7c5ef | 2008-08-19 02:13:55 +0200 | [diff] [blame] | 267 | target = iommu->cmd_buf + tail; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 268 | memcpy_toio(target, cmd, sizeof(*cmd)); |
| 269 | tail = (tail + sizeof(*cmd)) % iommu->cmd_buf_size; |
| 270 | head = readl(iommu->mmio_base + MMIO_CMD_HEAD_OFFSET); |
| 271 | if (tail == head) |
| 272 | return -ENOMEM; |
| 273 | writel(tail, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET); |
| 274 | |
| 275 | return 0; |
| 276 | } |
| 277 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 278 | /* |
| 279 | * General queuing function for commands. Takes iommu->lock and calls |
| 280 | * __iommu_queue_command(). |
| 281 | */ |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 282 | static int iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd) |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 283 | { |
| 284 | unsigned long flags; |
| 285 | int ret; |
| 286 | |
| 287 | spin_lock_irqsave(&iommu->lock, flags); |
| 288 | ret = __iommu_queue_command(iommu, cmd); |
Joerg Roedel | 09ee17e | 2008-12-03 12:19:27 +0100 | [diff] [blame] | 289 | if (!ret) |
Joerg Roedel | 0cfd7aa | 2008-12-10 19:58:00 +0100 | [diff] [blame] | 290 | iommu->need_sync = true; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 291 | spin_unlock_irqrestore(&iommu->lock, flags); |
| 292 | |
| 293 | return ret; |
| 294 | } |
| 295 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 296 | /* |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 297 | * This function waits until an IOMMU has completed a completion |
| 298 | * wait command |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 299 | */ |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 300 | static void __iommu_wait_for_completion(struct amd_iommu *iommu) |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 301 | { |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 302 | int ready = 0; |
Joerg Roedel | 519c31b | 2008-08-14 19:55:15 +0200 | [diff] [blame] | 303 | unsigned status = 0; |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 304 | unsigned long i = 0; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 305 | |
Joerg Roedel | da49f6d | 2008-12-12 14:59:58 +0100 | [diff] [blame] | 306 | INC_STATS_COUNTER(compl_wait); |
| 307 | |
Joerg Roedel | 136f78a | 2008-07-11 17:14:27 +0200 | [diff] [blame] | 308 | while (!ready && (i < EXIT_LOOP_COUNT)) { |
| 309 | ++i; |
Joerg Roedel | 519c31b | 2008-08-14 19:55:15 +0200 | [diff] [blame] | 310 | /* wait for the bit to become one */ |
| 311 | status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET); |
| 312 | ready = status & MMIO_STATUS_COM_WAIT_INT_MASK; |
Joerg Roedel | 136f78a | 2008-07-11 17:14:27 +0200 | [diff] [blame] | 313 | } |
| 314 | |
Joerg Roedel | 519c31b | 2008-08-14 19:55:15 +0200 | [diff] [blame] | 315 | /* set bit back to zero */ |
| 316 | status &= ~MMIO_STATUS_COM_WAIT_INT_MASK; |
| 317 | writel(status, iommu->mmio_base + MMIO_STATUS_OFFSET); |
| 318 | |
Joerg Roedel | 6a1eddd | 2009-09-03 15:15:10 +0200 | [diff] [blame] | 319 | if (unlikely(i == EXIT_LOOP_COUNT)) { |
| 320 | spin_unlock(&iommu->lock); |
| 321 | reset_iommu_command_buffer(iommu); |
| 322 | spin_lock(&iommu->lock); |
| 323 | } |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 324 | } |
| 325 | |
| 326 | /* |
| 327 | * This function queues a completion wait command into the command |
| 328 | * buffer of an IOMMU |
| 329 | */ |
| 330 | static int __iommu_completion_wait(struct amd_iommu *iommu) |
| 331 | { |
| 332 | struct iommu_cmd cmd; |
| 333 | |
| 334 | memset(&cmd, 0, sizeof(cmd)); |
| 335 | cmd.data[0] = CMD_COMPL_WAIT_INT_MASK; |
| 336 | CMD_SET_TYPE(&cmd, CMD_COMPL_WAIT); |
| 337 | |
| 338 | return __iommu_queue_command(iommu, &cmd); |
| 339 | } |
| 340 | |
| 341 | /* |
| 342 | * This function is called whenever we need to ensure that the IOMMU has |
| 343 | * completed execution of all commands we sent. It sends a |
| 344 | * COMPLETION_WAIT command and waits for it to finish. The IOMMU informs |
| 345 | * us about that by writing a value to a physical address we pass with |
| 346 | * the command. |
| 347 | */ |
| 348 | static int iommu_completion_wait(struct amd_iommu *iommu) |
| 349 | { |
| 350 | int ret = 0; |
| 351 | unsigned long flags; |
| 352 | |
| 353 | spin_lock_irqsave(&iommu->lock, flags); |
| 354 | |
| 355 | if (!iommu->need_sync) |
| 356 | goto out; |
| 357 | |
| 358 | ret = __iommu_completion_wait(iommu); |
| 359 | |
Joerg Roedel | 0cfd7aa | 2008-12-10 19:58:00 +0100 | [diff] [blame] | 360 | iommu->need_sync = false; |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 361 | |
| 362 | if (ret) |
| 363 | goto out; |
| 364 | |
| 365 | __iommu_wait_for_completion(iommu); |
Joerg Roedel | 84df817 | 2008-12-17 16:36:44 +0100 | [diff] [blame] | 366 | |
Joerg Roedel | 7e4f88d | 2008-09-17 14:19:15 +0200 | [diff] [blame] | 367 | out: |
| 368 | spin_unlock_irqrestore(&iommu->lock, flags); |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 369 | |
| 370 | return 0; |
| 371 | } |
| 372 | |
Joerg Roedel | 0518a3a | 2009-11-20 16:00:05 +0100 | [diff] [blame] | 373 | static void iommu_flush_complete(struct protection_domain *domain) |
| 374 | { |
| 375 | int i; |
| 376 | |
| 377 | for (i = 0; i < amd_iommus_present; ++i) { |
| 378 | if (!domain->dev_iommu[i]) |
| 379 | continue; |
| 380 | |
| 381 | /* |
| 382 | * Devices of this domain are behind this IOMMU |
| 383 | * We need to wait for completion of all commands. |
| 384 | */ |
| 385 | iommu_completion_wait(amd_iommus[i]); |
| 386 | } |
| 387 | } |
| 388 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 389 | /* |
| 390 | * Command send function for invalidating a device table entry |
| 391 | */ |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 392 | static int iommu_queue_inv_dev_entry(struct amd_iommu *iommu, u16 devid) |
| 393 | { |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 394 | struct iommu_cmd cmd; |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 395 | int ret; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 396 | |
| 397 | BUG_ON(iommu == NULL); |
| 398 | |
| 399 | memset(&cmd, 0, sizeof(cmd)); |
| 400 | CMD_SET_TYPE(&cmd, CMD_INV_DEV_ENTRY); |
| 401 | cmd.data[0] = devid; |
| 402 | |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 403 | ret = iommu_queue_command(iommu, &cmd); |
| 404 | |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 405 | return ret; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 406 | } |
| 407 | |
Joerg Roedel | 237b6f3 | 2008-12-02 20:54:37 +0100 | [diff] [blame] | 408 | static void __iommu_build_inv_iommu_pages(struct iommu_cmd *cmd, u64 address, |
| 409 | u16 domid, int pde, int s) |
| 410 | { |
| 411 | memset(cmd, 0, sizeof(*cmd)); |
| 412 | address &= PAGE_MASK; |
| 413 | CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES); |
| 414 | cmd->data[1] |= domid; |
| 415 | cmd->data[2] = lower_32_bits(address); |
| 416 | cmd->data[3] = upper_32_bits(address); |
| 417 | if (s) /* size bit - we flush more than one 4kb page */ |
| 418 | cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK; |
| 419 | if (pde) /* PDE bit - we wan't flush everything not only the PTEs */ |
| 420 | cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK; |
| 421 | } |
| 422 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 423 | /* |
| 424 | * Generic command send function for invalidaing TLB entries |
| 425 | */ |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 426 | static int iommu_queue_inv_iommu_pages(struct amd_iommu *iommu, |
| 427 | u64 address, u16 domid, int pde, int s) |
| 428 | { |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 429 | struct iommu_cmd cmd; |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 430 | int ret; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 431 | |
Joerg Roedel | 237b6f3 | 2008-12-02 20:54:37 +0100 | [diff] [blame] | 432 | __iommu_build_inv_iommu_pages(&cmd, address, domid, pde, s); |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 433 | |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 434 | ret = iommu_queue_command(iommu, &cmd); |
| 435 | |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 436 | return ret; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 437 | } |
| 438 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 439 | /* |
| 440 | * TLB invalidation function which is called from the mapping functions. |
| 441 | * It invalidates a single PTE if the range to flush is within a single |
| 442 | * page. Otherwise it flushes the whole TLB of the IOMMU. |
| 443 | */ |
Joerg Roedel | 6de8ad9 | 2009-11-23 18:30:32 +0100 | [diff] [blame] | 444 | static void __iommu_flush_pages(struct protection_domain *domain, |
| 445 | u64 address, size_t size, int pde) |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 446 | { |
Joerg Roedel | 6de8ad9 | 2009-11-23 18:30:32 +0100 | [diff] [blame] | 447 | int s = 0, i; |
Joerg Roedel | dcd1e92 | 2009-11-20 15:30:58 +0100 | [diff] [blame] | 448 | unsigned long pages = iommu_num_pages(address, size, PAGE_SIZE); |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 449 | |
| 450 | address &= PAGE_MASK; |
| 451 | |
Joerg Roedel | 999ba41 | 2008-07-03 19:35:08 +0200 | [diff] [blame] | 452 | if (pages > 1) { |
| 453 | /* |
| 454 | * If we have to flush more than one page, flush all |
| 455 | * TLB entries for this domain |
| 456 | */ |
| 457 | address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS; |
| 458 | s = 1; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 459 | } |
| 460 | |
Joerg Roedel | 999ba41 | 2008-07-03 19:35:08 +0200 | [diff] [blame] | 461 | |
Joerg Roedel | 6de8ad9 | 2009-11-23 18:30:32 +0100 | [diff] [blame] | 462 | for (i = 0; i < amd_iommus_present; ++i) { |
| 463 | if (!domain->dev_iommu[i]) |
| 464 | continue; |
| 465 | |
| 466 | /* |
| 467 | * Devices of this domain are behind this IOMMU |
| 468 | * We need a TLB flush |
| 469 | */ |
| 470 | iommu_queue_inv_iommu_pages(amd_iommus[i], address, |
| 471 | domain->id, pde, s); |
| 472 | } |
| 473 | |
| 474 | return; |
| 475 | } |
| 476 | |
| 477 | static void iommu_flush_pages(struct protection_domain *domain, |
| 478 | u64 address, size_t size) |
| 479 | { |
| 480 | __iommu_flush_pages(domain, address, size, 0); |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 481 | } |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 482 | |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 483 | /* Flush the whole IO/TLB for a given protection domain */ |
Joerg Roedel | dcd1e92 | 2009-11-20 15:30:58 +0100 | [diff] [blame] | 484 | static void iommu_flush_tlb(struct protection_domain *domain) |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 485 | { |
Joerg Roedel | dcd1e92 | 2009-11-20 15:30:58 +0100 | [diff] [blame] | 486 | __iommu_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 0); |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 487 | } |
| 488 | |
Chris Wright | 42a49f9 | 2009-06-15 15:42:00 +0200 | [diff] [blame] | 489 | /* Flush the whole IO/TLB for a given protection domain - including PDE */ |
Joerg Roedel | dcd1e92 | 2009-11-20 15:30:58 +0100 | [diff] [blame] | 490 | static void iommu_flush_tlb_pde(struct protection_domain *domain) |
Chris Wright | 42a49f9 | 2009-06-15 15:42:00 +0200 | [diff] [blame] | 491 | { |
Joerg Roedel | dcd1e92 | 2009-11-20 15:30:58 +0100 | [diff] [blame] | 492 | __iommu_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 1); |
Chris Wright | 42a49f9 | 2009-06-15 15:42:00 +0200 | [diff] [blame] | 493 | } |
| 494 | |
Joerg Roedel | 43f4960 | 2008-12-02 21:01:12 +0100 | [diff] [blame] | 495 | /* |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 496 | * This function flushes all domains that have devices on the given IOMMU |
Joerg Roedel | 43f4960 | 2008-12-02 21:01:12 +0100 | [diff] [blame] | 497 | */ |
Joerg Roedel | e394d72 | 2009-09-03 15:28:33 +0200 | [diff] [blame] | 498 | static void flush_all_domains_on_iommu(struct amd_iommu *iommu) |
Joerg Roedel | bfd1be1 | 2009-05-05 15:33:57 +0200 | [diff] [blame] | 499 | { |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 500 | u64 address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS; |
| 501 | struct protection_domain *domain; |
| 502 | unsigned long flags; |
Joerg Roedel | bfd1be1 | 2009-05-05 15:33:57 +0200 | [diff] [blame] | 503 | |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 504 | spin_lock_irqsave(&amd_iommu_pd_lock, flags); |
| 505 | |
| 506 | list_for_each_entry(domain, &amd_iommu_pd_list, list) { |
| 507 | if (domain->dev_iommu[iommu->index] == 0) |
Joerg Roedel | bfd1be1 | 2009-05-05 15:33:57 +0200 | [diff] [blame] | 508 | continue; |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 509 | |
| 510 | spin_lock(&domain->lock); |
| 511 | iommu_queue_inv_iommu_pages(iommu, address, domain->id, 1, 1); |
| 512 | iommu_flush_complete(domain); |
| 513 | spin_unlock(&domain->lock); |
Joerg Roedel | bfd1be1 | 2009-05-05 15:33:57 +0200 | [diff] [blame] | 514 | } |
Joerg Roedel | e394d72 | 2009-09-03 15:28:33 +0200 | [diff] [blame] | 515 | |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 516 | spin_unlock_irqrestore(&amd_iommu_pd_lock, flags); |
Joerg Roedel | e394d72 | 2009-09-03 15:28:33 +0200 | [diff] [blame] | 517 | } |
| 518 | |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 519 | /* |
| 520 | * This function uses heavy locking and may disable irqs for some time. But |
| 521 | * this is no issue because it is only called during resume. |
| 522 | */ |
Joerg Roedel | e394d72 | 2009-09-03 15:28:33 +0200 | [diff] [blame] | 523 | void amd_iommu_flush_all_domains(void) |
| 524 | { |
Joerg Roedel | e330666 | 2009-11-20 16:48:58 +0100 | [diff] [blame] | 525 | struct protection_domain *domain; |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 526 | unsigned long flags; |
| 527 | |
| 528 | spin_lock_irqsave(&amd_iommu_pd_lock, flags); |
Joerg Roedel | e394d72 | 2009-09-03 15:28:33 +0200 | [diff] [blame] | 529 | |
Joerg Roedel | e330666 | 2009-11-20 16:48:58 +0100 | [diff] [blame] | 530 | list_for_each_entry(domain, &amd_iommu_pd_list, list) { |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 531 | spin_lock(&domain->lock); |
Joerg Roedel | e330666 | 2009-11-20 16:48:58 +0100 | [diff] [blame] | 532 | iommu_flush_tlb_pde(domain); |
| 533 | iommu_flush_complete(domain); |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 534 | spin_unlock(&domain->lock); |
Joerg Roedel | e330666 | 2009-11-20 16:48:58 +0100 | [diff] [blame] | 535 | } |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 536 | |
| 537 | spin_unlock_irqrestore(&amd_iommu_pd_lock, flags); |
Joerg Roedel | bfd1be1 | 2009-05-05 15:33:57 +0200 | [diff] [blame] | 538 | } |
| 539 | |
Joerg Roedel | d586d78 | 2009-09-03 15:39:23 +0200 | [diff] [blame] | 540 | static void flush_all_devices_for_iommu(struct amd_iommu *iommu) |
| 541 | { |
| 542 | int i; |
| 543 | |
| 544 | for (i = 0; i <= amd_iommu_last_bdf; ++i) { |
| 545 | if (iommu != amd_iommu_rlookup_table[i]) |
| 546 | continue; |
| 547 | |
| 548 | iommu_queue_inv_dev_entry(iommu, i); |
| 549 | iommu_completion_wait(iommu); |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 550 | } |
| 551 | } |
| 552 | |
Joerg Roedel | 6a0dbcb | 2009-09-02 15:41:59 +0200 | [diff] [blame] | 553 | static void flush_devices_by_domain(struct protection_domain *domain) |
Joerg Roedel | 7d7a110 | 2009-05-05 15:48:10 +0200 | [diff] [blame] | 554 | { |
| 555 | struct amd_iommu *iommu; |
| 556 | int i; |
| 557 | |
| 558 | for (i = 0; i <= amd_iommu_last_bdf; ++i) { |
Joerg Roedel | 6a0dbcb | 2009-09-02 15:41:59 +0200 | [diff] [blame] | 559 | if ((domain == NULL && amd_iommu_pd_table[i] == NULL) || |
| 560 | (amd_iommu_pd_table[i] != domain)) |
Joerg Roedel | 7d7a110 | 2009-05-05 15:48:10 +0200 | [diff] [blame] | 561 | continue; |
| 562 | |
| 563 | iommu = amd_iommu_rlookup_table[i]; |
| 564 | if (!iommu) |
| 565 | continue; |
| 566 | |
| 567 | iommu_queue_inv_dev_entry(iommu, i); |
| 568 | iommu_completion_wait(iommu); |
| 569 | } |
| 570 | } |
| 571 | |
Joerg Roedel | a345b23 | 2009-09-03 15:01:43 +0200 | [diff] [blame] | 572 | static void reset_iommu_command_buffer(struct amd_iommu *iommu) |
| 573 | { |
| 574 | pr_err("AMD-Vi: Resetting IOMMU command buffer\n"); |
| 575 | |
Joerg Roedel | b26e81b | 2009-09-03 15:08:09 +0200 | [diff] [blame] | 576 | if (iommu->reset_in_progress) |
| 577 | panic("AMD-Vi: ILLEGAL_COMMAND_ERROR while resetting command buffer\n"); |
| 578 | |
| 579 | iommu->reset_in_progress = true; |
| 580 | |
Joerg Roedel | a345b23 | 2009-09-03 15:01:43 +0200 | [diff] [blame] | 581 | amd_iommu_reset_cmd_buffer(iommu); |
| 582 | flush_all_devices_for_iommu(iommu); |
| 583 | flush_all_domains_on_iommu(iommu); |
Joerg Roedel | b26e81b | 2009-09-03 15:08:09 +0200 | [diff] [blame] | 584 | |
| 585 | iommu->reset_in_progress = false; |
Joerg Roedel | a345b23 | 2009-09-03 15:01:43 +0200 | [diff] [blame] | 586 | } |
| 587 | |
Joerg Roedel | 6a0dbcb | 2009-09-02 15:41:59 +0200 | [diff] [blame] | 588 | void amd_iommu_flush_all_devices(void) |
| 589 | { |
| 590 | flush_devices_by_domain(NULL); |
| 591 | } |
| 592 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 593 | /**************************************************************************** |
| 594 | * |
| 595 | * The functions below are used the create the page table mappings for |
| 596 | * unity mapped regions. |
| 597 | * |
| 598 | ****************************************************************************/ |
| 599 | |
| 600 | /* |
| 601 | * Generic mapping functions. It maps a physical address into a DMA |
| 602 | * address space. It allocates the page table pages if necessary. |
| 603 | * In the future it can be extended to a generic mapping function |
| 604 | * supporting all features of AMD IOMMU page tables like level skipping |
| 605 | * and full 64 bit address spaces. |
| 606 | */ |
Joerg Roedel | 38e817f | 2008-12-02 17:27:52 +0100 | [diff] [blame] | 607 | static int iommu_map_page(struct protection_domain *dom, |
| 608 | unsigned long bus_addr, |
| 609 | unsigned long phys_addr, |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 610 | int prot, |
| 611 | int map_size) |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 612 | { |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 613 | u64 __pte, *pte; |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 614 | |
| 615 | bus_addr = PAGE_ALIGN(bus_addr); |
Joerg Roedel | bb9d4ff | 2008-12-04 15:59:48 +0100 | [diff] [blame] | 616 | phys_addr = PAGE_ALIGN(phys_addr); |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 617 | |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 618 | BUG_ON(!PM_ALIGNED(map_size, bus_addr)); |
| 619 | BUG_ON(!PM_ALIGNED(map_size, phys_addr)); |
| 620 | |
Joerg Roedel | bad1cac | 2009-09-02 16:52:23 +0200 | [diff] [blame] | 621 | if (!(prot & IOMMU_PROT_MASK)) |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 622 | return -EINVAL; |
| 623 | |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 624 | pte = alloc_pte(dom, bus_addr, map_size, NULL, GFP_KERNEL); |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 625 | |
| 626 | if (IOMMU_PTE_PRESENT(*pte)) |
| 627 | return -EBUSY; |
| 628 | |
| 629 | __pte = phys_addr | IOMMU_PTE_P; |
| 630 | if (prot & IOMMU_PROT_IR) |
| 631 | __pte |= IOMMU_PTE_IR; |
| 632 | if (prot & IOMMU_PROT_IW) |
| 633 | __pte |= IOMMU_PTE_IW; |
| 634 | |
| 635 | *pte = __pte; |
| 636 | |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 637 | update_domain(dom); |
| 638 | |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 639 | return 0; |
| 640 | } |
| 641 | |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 642 | static void iommu_unmap_page(struct protection_domain *dom, |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 643 | unsigned long bus_addr, int map_size) |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 644 | { |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 645 | u64 *pte = fetch_pte(dom, bus_addr, map_size); |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 646 | |
Joerg Roedel | 38a76ee | 2009-09-02 17:02:47 +0200 | [diff] [blame] | 647 | if (pte) |
| 648 | *pte = 0; |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 649 | } |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 650 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 651 | /* |
| 652 | * This function checks if a specific unity mapping entry is needed for |
| 653 | * this specific IOMMU. |
| 654 | */ |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 655 | static int iommu_for_unity_map(struct amd_iommu *iommu, |
| 656 | struct unity_map_entry *entry) |
| 657 | { |
| 658 | u16 bdf, i; |
| 659 | |
| 660 | for (i = entry->devid_start; i <= entry->devid_end; ++i) { |
| 661 | bdf = amd_iommu_alias_table[i]; |
| 662 | if (amd_iommu_rlookup_table[bdf] == iommu) |
| 663 | return 1; |
| 664 | } |
| 665 | |
| 666 | return 0; |
| 667 | } |
| 668 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 669 | /* |
| 670 | * Init the unity mappings for a specific IOMMU in the system |
| 671 | * |
| 672 | * Basically iterates over all unity mapping entries and applies them to |
| 673 | * the default domain DMA of that IOMMU if necessary. |
| 674 | */ |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 675 | static int iommu_init_unity_mappings(struct amd_iommu *iommu) |
| 676 | { |
| 677 | struct unity_map_entry *entry; |
| 678 | int ret; |
| 679 | |
| 680 | list_for_each_entry(entry, &amd_iommu_unity_map, list) { |
| 681 | if (!iommu_for_unity_map(iommu, entry)) |
| 682 | continue; |
| 683 | ret = dma_ops_unity_map(iommu->default_dom, entry); |
| 684 | if (ret) |
| 685 | return ret; |
| 686 | } |
| 687 | |
| 688 | return 0; |
| 689 | } |
| 690 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 691 | /* |
| 692 | * This function actually applies the mapping to the page table of the |
| 693 | * dma_ops domain. |
| 694 | */ |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 695 | static int dma_ops_unity_map(struct dma_ops_domain *dma_dom, |
| 696 | struct unity_map_entry *e) |
| 697 | { |
| 698 | u64 addr; |
| 699 | int ret; |
| 700 | |
| 701 | for (addr = e->address_start; addr < e->address_end; |
| 702 | addr += PAGE_SIZE) { |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 703 | ret = iommu_map_page(&dma_dom->domain, addr, addr, e->prot, |
| 704 | PM_MAP_4k); |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 705 | if (ret) |
| 706 | return ret; |
| 707 | /* |
| 708 | * if unity mapping is in aperture range mark the page |
| 709 | * as allocated in the aperture |
| 710 | */ |
| 711 | if (addr < dma_dom->aperture_size) |
Joerg Roedel | c323956 | 2009-05-12 10:56:44 +0200 | [diff] [blame] | 712 | __set_bit(addr >> PAGE_SHIFT, |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 713 | dma_dom->aperture[0]->bitmap); |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 714 | } |
| 715 | |
| 716 | return 0; |
| 717 | } |
| 718 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 719 | /* |
| 720 | * Inits the unity mappings required for a specific device |
| 721 | */ |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 722 | static int init_unity_mappings_for_device(struct dma_ops_domain *dma_dom, |
| 723 | u16 devid) |
| 724 | { |
| 725 | struct unity_map_entry *e; |
| 726 | int ret; |
| 727 | |
| 728 | list_for_each_entry(e, &amd_iommu_unity_map, list) { |
| 729 | if (!(devid >= e->devid_start && devid <= e->devid_end)) |
| 730 | continue; |
| 731 | ret = dma_ops_unity_map(dma_dom, e); |
| 732 | if (ret) |
| 733 | return ret; |
| 734 | } |
| 735 | |
| 736 | return 0; |
| 737 | } |
| 738 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 739 | /**************************************************************************** |
| 740 | * |
| 741 | * The next functions belong to the address allocator for the dma_ops |
| 742 | * interface functions. They work like the allocators in the other IOMMU |
| 743 | * drivers. Its basically a bitmap which marks the allocated pages in |
| 744 | * the aperture. Maybe it could be enhanced in the future to a more |
| 745 | * efficient allocator. |
| 746 | * |
| 747 | ****************************************************************************/ |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 748 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 749 | /* |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 750 | * The address allocator core functions. |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 751 | * |
| 752 | * called with domain->lock held |
| 753 | */ |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 754 | |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 755 | /* |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 756 | * This function checks if there is a PTE for a given dma address. If |
| 757 | * there is one, it returns the pointer to it. |
| 758 | */ |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 759 | static u64 *fetch_pte(struct protection_domain *domain, |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 760 | unsigned long address, int map_size) |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 761 | { |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 762 | int level; |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 763 | u64 *pte; |
| 764 | |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 765 | level = domain->mode - 1; |
| 766 | pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)]; |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 767 | |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 768 | while (level > map_size) { |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 769 | if (!IOMMU_PTE_PRESENT(*pte)) |
| 770 | return NULL; |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 771 | |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 772 | level -= 1; |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 773 | |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 774 | pte = IOMMU_PTE_PAGE(*pte); |
| 775 | pte = &pte[PM_LEVEL_INDEX(level, address)]; |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 776 | |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 777 | if ((PM_PTE_LEVEL(*pte) == 0) && level != map_size) { |
| 778 | pte = NULL; |
| 779 | break; |
| 780 | } |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 781 | } |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 782 | |
| 783 | return pte; |
| 784 | } |
| 785 | |
| 786 | /* |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 787 | * This function is used to add a new aperture range to an existing |
| 788 | * aperture in case of dma_ops domain allocation or address allocation |
| 789 | * failure. |
| 790 | */ |
Joerg Roedel | 576175c | 2009-11-23 19:08:46 +0100 | [diff] [blame] | 791 | static int alloc_new_range(struct dma_ops_domain *dma_dom, |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 792 | bool populate, gfp_t gfp) |
| 793 | { |
| 794 | int index = dma_dom->aperture_size >> APERTURE_RANGE_SHIFT; |
Joerg Roedel | 576175c | 2009-11-23 19:08:46 +0100 | [diff] [blame] | 795 | struct amd_iommu *iommu; |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 796 | int i; |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 797 | |
Joerg Roedel | f5e9705 | 2009-05-22 12:31:53 +0200 | [diff] [blame] | 798 | #ifdef CONFIG_IOMMU_STRESS |
| 799 | populate = false; |
| 800 | #endif |
| 801 | |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 802 | if (index >= APERTURE_MAX_RANGES) |
| 803 | return -ENOMEM; |
| 804 | |
| 805 | dma_dom->aperture[index] = kzalloc(sizeof(struct aperture_range), gfp); |
| 806 | if (!dma_dom->aperture[index]) |
| 807 | return -ENOMEM; |
| 808 | |
| 809 | dma_dom->aperture[index]->bitmap = (void *)get_zeroed_page(gfp); |
| 810 | if (!dma_dom->aperture[index]->bitmap) |
| 811 | goto out_free; |
| 812 | |
| 813 | dma_dom->aperture[index]->offset = dma_dom->aperture_size; |
| 814 | |
| 815 | if (populate) { |
| 816 | unsigned long address = dma_dom->aperture_size; |
| 817 | int i, num_ptes = APERTURE_RANGE_PAGES / 512; |
| 818 | u64 *pte, *pte_page; |
| 819 | |
| 820 | for (i = 0; i < num_ptes; ++i) { |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 821 | pte = alloc_pte(&dma_dom->domain, address, PM_MAP_4k, |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 822 | &pte_page, gfp); |
| 823 | if (!pte) |
| 824 | goto out_free; |
| 825 | |
| 826 | dma_dom->aperture[index]->pte_pages[i] = pte_page; |
| 827 | |
| 828 | address += APERTURE_RANGE_SIZE / 64; |
| 829 | } |
| 830 | } |
| 831 | |
| 832 | dma_dom->aperture_size += APERTURE_RANGE_SIZE; |
| 833 | |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 834 | /* Intialize the exclusion range if necessary */ |
Joerg Roedel | 576175c | 2009-11-23 19:08:46 +0100 | [diff] [blame] | 835 | for_each_iommu(iommu) { |
| 836 | if (iommu->exclusion_start && |
| 837 | iommu->exclusion_start >= dma_dom->aperture[index]->offset |
| 838 | && iommu->exclusion_start < dma_dom->aperture_size) { |
| 839 | unsigned long startpage; |
| 840 | int pages = iommu_num_pages(iommu->exclusion_start, |
| 841 | iommu->exclusion_length, |
| 842 | PAGE_SIZE); |
| 843 | startpage = iommu->exclusion_start >> PAGE_SHIFT; |
| 844 | dma_ops_reserve_addresses(dma_dom, startpage, pages); |
| 845 | } |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 846 | } |
| 847 | |
| 848 | /* |
| 849 | * Check for areas already mapped as present in the new aperture |
| 850 | * range and mark those pages as reserved in the allocator. Such |
| 851 | * mappings may already exist as a result of requested unity |
| 852 | * mappings for devices. |
| 853 | */ |
| 854 | for (i = dma_dom->aperture[index]->offset; |
| 855 | i < dma_dom->aperture_size; |
| 856 | i += PAGE_SIZE) { |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 857 | u64 *pte = fetch_pte(&dma_dom->domain, i, PM_MAP_4k); |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 858 | if (!pte || !IOMMU_PTE_PRESENT(*pte)) |
| 859 | continue; |
| 860 | |
| 861 | dma_ops_reserve_addresses(dma_dom, i << PAGE_SHIFT, 1); |
| 862 | } |
| 863 | |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 864 | update_domain(&dma_dom->domain); |
| 865 | |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 866 | return 0; |
| 867 | |
| 868 | out_free: |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 869 | update_domain(&dma_dom->domain); |
| 870 | |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 871 | free_page((unsigned long)dma_dom->aperture[index]->bitmap); |
| 872 | |
| 873 | kfree(dma_dom->aperture[index]); |
| 874 | dma_dom->aperture[index] = NULL; |
| 875 | |
| 876 | return -ENOMEM; |
| 877 | } |
| 878 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 879 | static unsigned long dma_ops_area_alloc(struct device *dev, |
| 880 | struct dma_ops_domain *dom, |
| 881 | unsigned int pages, |
| 882 | unsigned long align_mask, |
| 883 | u64 dma_mask, |
| 884 | unsigned long start) |
| 885 | { |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 886 | unsigned long next_bit = dom->next_address % APERTURE_RANGE_SIZE; |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 887 | int max_index = dom->aperture_size >> APERTURE_RANGE_SHIFT; |
| 888 | int i = start >> APERTURE_RANGE_SHIFT; |
| 889 | unsigned long boundary_size; |
| 890 | unsigned long address = -1; |
| 891 | unsigned long limit; |
| 892 | |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 893 | next_bit >>= PAGE_SHIFT; |
| 894 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 895 | boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1, |
| 896 | PAGE_SIZE) >> PAGE_SHIFT; |
| 897 | |
| 898 | for (;i < max_index; ++i) { |
| 899 | unsigned long offset = dom->aperture[i]->offset >> PAGE_SHIFT; |
| 900 | |
| 901 | if (dom->aperture[i]->offset >= dma_mask) |
| 902 | break; |
| 903 | |
| 904 | limit = iommu_device_max_index(APERTURE_RANGE_PAGES, offset, |
| 905 | dma_mask >> PAGE_SHIFT); |
| 906 | |
| 907 | address = iommu_area_alloc(dom->aperture[i]->bitmap, |
| 908 | limit, next_bit, pages, 0, |
| 909 | boundary_size, align_mask); |
| 910 | if (address != -1) { |
| 911 | address = dom->aperture[i]->offset + |
| 912 | (address << PAGE_SHIFT); |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 913 | dom->next_address = address + (pages << PAGE_SHIFT); |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 914 | break; |
| 915 | } |
| 916 | |
| 917 | next_bit = 0; |
| 918 | } |
| 919 | |
| 920 | return address; |
| 921 | } |
| 922 | |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 923 | static unsigned long dma_ops_alloc_addresses(struct device *dev, |
| 924 | struct dma_ops_domain *dom, |
Joerg Roedel | 6d4f343f | 2008-09-04 19:18:02 +0200 | [diff] [blame] | 925 | unsigned int pages, |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 926 | unsigned long align_mask, |
| 927 | u64 dma_mask) |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 928 | { |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 929 | unsigned long address; |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 930 | |
Joerg Roedel | fe16f08 | 2009-05-22 12:27:53 +0200 | [diff] [blame] | 931 | #ifdef CONFIG_IOMMU_STRESS |
| 932 | dom->next_address = 0; |
| 933 | dom->need_flush = true; |
| 934 | #endif |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 935 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 936 | address = dma_ops_area_alloc(dev, dom, pages, align_mask, |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 937 | dma_mask, dom->next_address); |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 938 | |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 939 | if (address == -1) { |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 940 | dom->next_address = 0; |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 941 | address = dma_ops_area_alloc(dev, dom, pages, align_mask, |
| 942 | dma_mask, 0); |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 943 | dom->need_flush = true; |
| 944 | } |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 945 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 946 | if (unlikely(address == -1)) |
FUJITA Tomonori | 8fd524b | 2009-11-15 21:19:53 +0900 | [diff] [blame] | 947 | address = DMA_ERROR_CODE; |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 948 | |
| 949 | WARN_ON((address + (PAGE_SIZE*pages)) > dom->aperture_size); |
| 950 | |
| 951 | return address; |
| 952 | } |
| 953 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 954 | /* |
| 955 | * The address free function. |
| 956 | * |
| 957 | * called with domain->lock held |
| 958 | */ |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 959 | static void dma_ops_free_addresses(struct dma_ops_domain *dom, |
| 960 | unsigned long address, |
| 961 | unsigned int pages) |
| 962 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 963 | unsigned i = address >> APERTURE_RANGE_SHIFT; |
| 964 | struct aperture_range *range = dom->aperture[i]; |
Joerg Roedel | 80be308 | 2008-11-06 14:59:05 +0100 | [diff] [blame] | 965 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 966 | BUG_ON(i >= APERTURE_MAX_RANGES || range == NULL); |
| 967 | |
Joerg Roedel | 47bccd6 | 2009-05-22 12:40:54 +0200 | [diff] [blame] | 968 | #ifdef CONFIG_IOMMU_STRESS |
| 969 | if (i < 4) |
| 970 | return; |
| 971 | #endif |
| 972 | |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 973 | if (address >= dom->next_address) |
Joerg Roedel | 80be308 | 2008-11-06 14:59:05 +0100 | [diff] [blame] | 974 | dom->need_flush = true; |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 975 | |
| 976 | address = (address % APERTURE_RANGE_SIZE) >> PAGE_SHIFT; |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 977 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 978 | iommu_area_free(range->bitmap, address, pages); |
| 979 | |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 980 | } |
| 981 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 982 | /**************************************************************************** |
| 983 | * |
| 984 | * The next functions belong to the domain allocation. A domain is |
| 985 | * allocated for every IOMMU as the default domain. If device isolation |
| 986 | * is enabled, every device get its own domain. The most important thing |
| 987 | * about domains is the page table mapping the DMA address space they |
| 988 | * contain. |
| 989 | * |
| 990 | ****************************************************************************/ |
| 991 | |
Joerg Roedel | aeb26f5 | 2009-11-20 16:44:01 +0100 | [diff] [blame] | 992 | /* |
| 993 | * This function adds a protection domain to the global protection domain list |
| 994 | */ |
| 995 | static void add_domain_to_list(struct protection_domain *domain) |
| 996 | { |
| 997 | unsigned long flags; |
| 998 | |
| 999 | spin_lock_irqsave(&amd_iommu_pd_lock, flags); |
| 1000 | list_add(&domain->list, &amd_iommu_pd_list); |
| 1001 | spin_unlock_irqrestore(&amd_iommu_pd_lock, flags); |
| 1002 | } |
| 1003 | |
| 1004 | /* |
| 1005 | * This function removes a protection domain to the global |
| 1006 | * protection domain list |
| 1007 | */ |
| 1008 | static void del_domain_from_list(struct protection_domain *domain) |
| 1009 | { |
| 1010 | unsigned long flags; |
| 1011 | |
| 1012 | spin_lock_irqsave(&amd_iommu_pd_lock, flags); |
| 1013 | list_del(&domain->list); |
| 1014 | spin_unlock_irqrestore(&amd_iommu_pd_lock, flags); |
| 1015 | } |
| 1016 | |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1017 | static u16 domain_id_alloc(void) |
| 1018 | { |
| 1019 | unsigned long flags; |
| 1020 | int id; |
| 1021 | |
| 1022 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 1023 | id = find_first_zero_bit(amd_iommu_pd_alloc_bitmap, MAX_DOMAIN_ID); |
| 1024 | BUG_ON(id == 0); |
| 1025 | if (id > 0 && id < MAX_DOMAIN_ID) |
| 1026 | __set_bit(id, amd_iommu_pd_alloc_bitmap); |
| 1027 | else |
| 1028 | id = 0; |
| 1029 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 1030 | |
| 1031 | return id; |
| 1032 | } |
| 1033 | |
Joerg Roedel | a2acfb7 | 2008-12-02 18:28:53 +0100 | [diff] [blame] | 1034 | static void domain_id_free(int id) |
| 1035 | { |
| 1036 | unsigned long flags; |
| 1037 | |
| 1038 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 1039 | if (id > 0 && id < MAX_DOMAIN_ID) |
| 1040 | __clear_bit(id, amd_iommu_pd_alloc_bitmap); |
| 1041 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 1042 | } |
Joerg Roedel | a2acfb7 | 2008-12-02 18:28:53 +0100 | [diff] [blame] | 1043 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1044 | /* |
| 1045 | * Used to reserve address ranges in the aperture (e.g. for exclusion |
| 1046 | * ranges. |
| 1047 | */ |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1048 | static void dma_ops_reserve_addresses(struct dma_ops_domain *dom, |
| 1049 | unsigned long start_page, |
| 1050 | unsigned int pages) |
| 1051 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1052 | unsigned int i, last_page = dom->aperture_size >> PAGE_SHIFT; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1053 | |
| 1054 | if (start_page + pages > last_page) |
| 1055 | pages = last_page - start_page; |
| 1056 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1057 | for (i = start_page; i < start_page + pages; ++i) { |
| 1058 | int index = i / APERTURE_RANGE_PAGES; |
| 1059 | int page = i % APERTURE_RANGE_PAGES; |
| 1060 | __set_bit(page, dom->aperture[index]->bitmap); |
| 1061 | } |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1062 | } |
| 1063 | |
Joerg Roedel | 86db2e5 | 2008-12-02 18:20:21 +0100 | [diff] [blame] | 1064 | static void free_pagetable(struct protection_domain *domain) |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1065 | { |
| 1066 | int i, j; |
| 1067 | u64 *p1, *p2, *p3; |
| 1068 | |
Joerg Roedel | 86db2e5 | 2008-12-02 18:20:21 +0100 | [diff] [blame] | 1069 | p1 = domain->pt_root; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1070 | |
| 1071 | if (!p1) |
| 1072 | return; |
| 1073 | |
| 1074 | for (i = 0; i < 512; ++i) { |
| 1075 | if (!IOMMU_PTE_PRESENT(p1[i])) |
| 1076 | continue; |
| 1077 | |
| 1078 | p2 = IOMMU_PTE_PAGE(p1[i]); |
Joerg Roedel | 3cc3d84 | 2008-12-04 16:44:31 +0100 | [diff] [blame] | 1079 | for (j = 0; j < 512; ++j) { |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1080 | if (!IOMMU_PTE_PRESENT(p2[j])) |
| 1081 | continue; |
| 1082 | p3 = IOMMU_PTE_PAGE(p2[j]); |
| 1083 | free_page((unsigned long)p3); |
| 1084 | } |
| 1085 | |
| 1086 | free_page((unsigned long)p2); |
| 1087 | } |
| 1088 | |
| 1089 | free_page((unsigned long)p1); |
Joerg Roedel | 86db2e5 | 2008-12-02 18:20:21 +0100 | [diff] [blame] | 1090 | |
| 1091 | domain->pt_root = NULL; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1092 | } |
| 1093 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1094 | /* |
| 1095 | * Free a domain, only used if something went wrong in the |
| 1096 | * allocation path and we need to free an already allocated page table |
| 1097 | */ |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1098 | static void dma_ops_domain_free(struct dma_ops_domain *dom) |
| 1099 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1100 | int i; |
| 1101 | |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1102 | if (!dom) |
| 1103 | return; |
| 1104 | |
Joerg Roedel | aeb26f5 | 2009-11-20 16:44:01 +0100 | [diff] [blame] | 1105 | del_domain_from_list(&dom->domain); |
| 1106 | |
Joerg Roedel | 86db2e5 | 2008-12-02 18:20:21 +0100 | [diff] [blame] | 1107 | free_pagetable(&dom->domain); |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1108 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1109 | for (i = 0; i < APERTURE_MAX_RANGES; ++i) { |
| 1110 | if (!dom->aperture[i]) |
| 1111 | continue; |
| 1112 | free_page((unsigned long)dom->aperture[i]->bitmap); |
| 1113 | kfree(dom->aperture[i]); |
| 1114 | } |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1115 | |
| 1116 | kfree(dom); |
| 1117 | } |
| 1118 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1119 | /* |
| 1120 | * Allocates a new protection domain usable for the dma_ops functions. |
| 1121 | * It also intializes the page table and the address allocator data |
| 1122 | * structures required for the dma_ops interface |
| 1123 | */ |
Joerg Roedel | d9cfed9 | 2009-05-19 12:16:29 +0200 | [diff] [blame] | 1124 | static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu) |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1125 | { |
| 1126 | struct dma_ops_domain *dma_dom; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1127 | |
| 1128 | dma_dom = kzalloc(sizeof(struct dma_ops_domain), GFP_KERNEL); |
| 1129 | if (!dma_dom) |
| 1130 | return NULL; |
| 1131 | |
| 1132 | spin_lock_init(&dma_dom->domain.lock); |
| 1133 | |
| 1134 | dma_dom->domain.id = domain_id_alloc(); |
| 1135 | if (dma_dom->domain.id == 0) |
| 1136 | goto free_dma_dom; |
Joerg Roedel | 8f7a017 | 2009-09-02 16:55:24 +0200 | [diff] [blame] | 1137 | dma_dom->domain.mode = PAGE_MODE_2_LEVEL; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1138 | dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL); |
Joerg Roedel | 9fdb19d | 2008-12-02 17:46:25 +0100 | [diff] [blame] | 1139 | dma_dom->domain.flags = PD_DMA_OPS_MASK; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1140 | dma_dom->domain.priv = dma_dom; |
| 1141 | if (!dma_dom->domain.pt_root) |
| 1142 | goto free_dma_dom; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1143 | |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 1144 | dma_dom->need_flush = false; |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 1145 | dma_dom->target_dev = 0xffff; |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 1146 | |
Joerg Roedel | aeb26f5 | 2009-11-20 16:44:01 +0100 | [diff] [blame] | 1147 | add_domain_to_list(&dma_dom->domain); |
| 1148 | |
Joerg Roedel | 576175c | 2009-11-23 19:08:46 +0100 | [diff] [blame] | 1149 | if (alloc_new_range(dma_dom, true, GFP_KERNEL)) |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1150 | goto free_dma_dom; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1151 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1152 | /* |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1153 | * mark the first page as allocated so we never return 0 as |
| 1154 | * a valid dma-address. So we can use 0 as error value |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1155 | */ |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1156 | dma_dom->aperture[0]->bitmap[0] = 1; |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 1157 | dma_dom->next_address = 0; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1158 | |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1159 | |
| 1160 | return dma_dom; |
| 1161 | |
| 1162 | free_dma_dom: |
| 1163 | dma_ops_domain_free(dma_dom); |
| 1164 | |
| 1165 | return NULL; |
| 1166 | } |
| 1167 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1168 | /* |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1169 | * little helper function to check whether a given protection domain is a |
| 1170 | * dma_ops domain |
| 1171 | */ |
| 1172 | static bool dma_ops_domain(struct protection_domain *domain) |
| 1173 | { |
| 1174 | return domain->flags & PD_DMA_OPS_MASK; |
| 1175 | } |
| 1176 | |
| 1177 | /* |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1178 | * Find out the protection domain structure for a given PCI device. This |
| 1179 | * will give us the pointer to the page table root for example. |
| 1180 | */ |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1181 | static struct protection_domain *domain_for_device(u16 devid) |
| 1182 | { |
| 1183 | struct protection_domain *dom; |
| 1184 | unsigned long flags; |
| 1185 | |
| 1186 | read_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 1187 | dom = amd_iommu_pd_table[devid]; |
| 1188 | read_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 1189 | |
| 1190 | return dom; |
| 1191 | } |
| 1192 | |
Joerg Roedel | 407d733 | 2009-09-02 16:07:00 +0200 | [diff] [blame] | 1193 | static void set_dte_entry(u16 devid, struct protection_domain *domain) |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1194 | { |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1195 | u64 pte_root = virt_to_phys(domain->pt_root); |
Joerg Roedel | 863c74e | 2008-12-02 17:56:36 +0100 | [diff] [blame] | 1196 | |
Joerg Roedel | 38ddf41 | 2008-09-11 10:38:32 +0200 | [diff] [blame] | 1197 | pte_root |= (domain->mode & DEV_ENTRY_MODE_MASK) |
| 1198 | << DEV_ENTRY_MODE_SHIFT; |
| 1199 | pte_root |= IOMMU_PTE_IR | IOMMU_PTE_IW | IOMMU_PTE_P | IOMMU_PTE_TV; |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1200 | |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1201 | amd_iommu_dev_table[devid].data[2] = domain->id; |
Joerg Roedel | aa879ff | 2009-08-31 16:01:48 +0200 | [diff] [blame] | 1202 | amd_iommu_dev_table[devid].data[1] = upper_32_bits(pte_root); |
| 1203 | amd_iommu_dev_table[devid].data[0] = lower_32_bits(pte_root); |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1204 | |
| 1205 | amd_iommu_pd_table[devid] = domain; |
Joerg Roedel | 2b681fa | 2009-09-03 17:14:57 +0200 | [diff] [blame] | 1206 | } |
| 1207 | |
| 1208 | /* |
| 1209 | * If a device is not yet associated with a domain, this function does |
| 1210 | * assigns it visible for the hardware |
| 1211 | */ |
| 1212 | static void __attach_device(struct amd_iommu *iommu, |
| 1213 | struct protection_domain *domain, |
| 1214 | u16 devid) |
| 1215 | { |
| 1216 | /* lock domain */ |
| 1217 | spin_lock(&domain->lock); |
| 1218 | |
| 1219 | /* update DTE entry */ |
| 1220 | set_dte_entry(devid, domain); |
Joerg Roedel | eba6ac6 | 2009-09-01 12:07:08 +0200 | [diff] [blame] | 1221 | |
Joerg Roedel | c459611 | 2009-11-20 14:57:32 +0100 | [diff] [blame] | 1222 | /* Do reference counting */ |
| 1223 | domain->dev_iommu[iommu->index] += 1; |
| 1224 | domain->dev_cnt += 1; |
Joerg Roedel | eba6ac6 | 2009-09-01 12:07:08 +0200 | [diff] [blame] | 1225 | |
| 1226 | /* ready */ |
| 1227 | spin_unlock(&domain->lock); |
Joerg Roedel | 0feae53 | 2009-08-26 15:26:30 +0200 | [diff] [blame] | 1228 | } |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1229 | |
Joerg Roedel | 407d733 | 2009-09-02 16:07:00 +0200 | [diff] [blame] | 1230 | /* |
| 1231 | * If a device is not yet associated with a domain, this function does |
| 1232 | * assigns it visible for the hardware |
| 1233 | */ |
Joerg Roedel | 0feae53 | 2009-08-26 15:26:30 +0200 | [diff] [blame] | 1234 | static void attach_device(struct amd_iommu *iommu, |
| 1235 | struct protection_domain *domain, |
| 1236 | u16 devid) |
| 1237 | { |
Joerg Roedel | eba6ac6 | 2009-09-01 12:07:08 +0200 | [diff] [blame] | 1238 | unsigned long flags; |
| 1239 | |
| 1240 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
Joerg Roedel | 0feae53 | 2009-08-26 15:26:30 +0200 | [diff] [blame] | 1241 | __attach_device(iommu, domain, devid); |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1242 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 1243 | |
Joerg Roedel | 0feae53 | 2009-08-26 15:26:30 +0200 | [diff] [blame] | 1244 | /* |
| 1245 | * We might boot into a crash-kernel here. The crashed kernel |
| 1246 | * left the caches in the IOMMU dirty. So we have to flush |
| 1247 | * here to evict all dirty stuff. |
| 1248 | */ |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1249 | iommu_queue_inv_dev_entry(iommu, devid); |
Joerg Roedel | dcd1e92 | 2009-11-20 15:30:58 +0100 | [diff] [blame] | 1250 | iommu_flush_tlb_pde(domain); |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1251 | } |
| 1252 | |
Joerg Roedel | 355bf55 | 2008-12-08 12:02:41 +0100 | [diff] [blame] | 1253 | /* |
| 1254 | * Removes a device from a protection domain (unlocked) |
| 1255 | */ |
| 1256 | static void __detach_device(struct protection_domain *domain, u16 devid) |
| 1257 | { |
Joerg Roedel | c459611 | 2009-11-20 14:57:32 +0100 | [diff] [blame] | 1258 | struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; |
| 1259 | |
| 1260 | BUG_ON(!iommu); |
Joerg Roedel | 355bf55 | 2008-12-08 12:02:41 +0100 | [diff] [blame] | 1261 | |
| 1262 | /* lock domain */ |
| 1263 | spin_lock(&domain->lock); |
| 1264 | |
| 1265 | /* remove domain from the lookup table */ |
| 1266 | amd_iommu_pd_table[devid] = NULL; |
| 1267 | |
| 1268 | /* remove entry from the device table seen by the hardware */ |
| 1269 | amd_iommu_dev_table[devid].data[0] = IOMMU_PTE_P | IOMMU_PTE_TV; |
| 1270 | amd_iommu_dev_table[devid].data[1] = 0; |
| 1271 | amd_iommu_dev_table[devid].data[2] = 0; |
| 1272 | |
Joerg Roedel | c5cca14 | 2009-10-09 18:31:20 +0200 | [diff] [blame] | 1273 | amd_iommu_apply_erratum_63(devid); |
| 1274 | |
Joerg Roedel | c459611 | 2009-11-20 14:57:32 +0100 | [diff] [blame] | 1275 | /* decrease reference counters */ |
| 1276 | domain->dev_iommu[iommu->index] -= 1; |
| 1277 | domain->dev_cnt -= 1; |
Joerg Roedel | 355bf55 | 2008-12-08 12:02:41 +0100 | [diff] [blame] | 1278 | |
| 1279 | /* ready */ |
| 1280 | spin_unlock(&domain->lock); |
Joerg Roedel | 21129f7 | 2009-09-01 11:59:42 +0200 | [diff] [blame] | 1281 | |
| 1282 | /* |
| 1283 | * If we run in passthrough mode the device must be assigned to the |
| 1284 | * passthrough domain if it is detached from any other domain |
| 1285 | */ |
| 1286 | if (iommu_pass_through) { |
| 1287 | struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; |
| 1288 | __attach_device(iommu, pt_domain, devid); |
| 1289 | } |
Joerg Roedel | 355bf55 | 2008-12-08 12:02:41 +0100 | [diff] [blame] | 1290 | } |
| 1291 | |
| 1292 | /* |
| 1293 | * Removes a device from a protection domain (with devtable_lock held) |
| 1294 | */ |
| 1295 | static void detach_device(struct protection_domain *domain, u16 devid) |
| 1296 | { |
| 1297 | unsigned long flags; |
| 1298 | |
| 1299 | /* lock device table */ |
| 1300 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 1301 | __detach_device(domain, devid); |
| 1302 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 1303 | } |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1304 | |
| 1305 | static int device_change_notifier(struct notifier_block *nb, |
| 1306 | unsigned long action, void *data) |
| 1307 | { |
| 1308 | struct device *dev = data; |
| 1309 | struct pci_dev *pdev = to_pci_dev(dev); |
| 1310 | u16 devid = calc_devid(pdev->bus->number, pdev->devfn); |
| 1311 | struct protection_domain *domain; |
| 1312 | struct dma_ops_domain *dma_domain; |
| 1313 | struct amd_iommu *iommu; |
Joerg Roedel | 1ac4cbb | 2008-12-10 19:33:26 +0100 | [diff] [blame] | 1314 | unsigned long flags; |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1315 | |
| 1316 | if (devid > amd_iommu_last_bdf) |
| 1317 | goto out; |
| 1318 | |
| 1319 | devid = amd_iommu_alias_table[devid]; |
| 1320 | |
| 1321 | iommu = amd_iommu_rlookup_table[devid]; |
| 1322 | if (iommu == NULL) |
| 1323 | goto out; |
| 1324 | |
| 1325 | domain = domain_for_device(devid); |
| 1326 | |
| 1327 | if (domain && !dma_ops_domain(domain)) |
| 1328 | WARN_ONCE(1, "AMD IOMMU WARNING: device %s already bound " |
| 1329 | "to a non-dma-ops domain\n", dev_name(dev)); |
| 1330 | |
| 1331 | switch (action) { |
Chris Wright | c1eee67 | 2009-05-21 00:56:58 -0700 | [diff] [blame] | 1332 | case BUS_NOTIFY_UNBOUND_DRIVER: |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1333 | if (!domain) |
| 1334 | goto out; |
Joerg Roedel | a1ca331 | 2009-09-01 12:22:22 +0200 | [diff] [blame] | 1335 | if (iommu_pass_through) |
| 1336 | break; |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1337 | detach_device(domain, devid); |
| 1338 | break; |
Joerg Roedel | 1ac4cbb | 2008-12-10 19:33:26 +0100 | [diff] [blame] | 1339 | case BUS_NOTIFY_ADD_DEVICE: |
| 1340 | /* allocate a protection domain if a device is added */ |
| 1341 | dma_domain = find_protection_domain(devid); |
| 1342 | if (dma_domain) |
| 1343 | goto out; |
Joerg Roedel | d9cfed9 | 2009-05-19 12:16:29 +0200 | [diff] [blame] | 1344 | dma_domain = dma_ops_domain_alloc(iommu); |
Joerg Roedel | 1ac4cbb | 2008-12-10 19:33:26 +0100 | [diff] [blame] | 1345 | if (!dma_domain) |
| 1346 | goto out; |
| 1347 | dma_domain->target_dev = devid; |
| 1348 | |
| 1349 | spin_lock_irqsave(&iommu_pd_list_lock, flags); |
| 1350 | list_add_tail(&dma_domain->list, &iommu_pd_list); |
| 1351 | spin_unlock_irqrestore(&iommu_pd_list_lock, flags); |
| 1352 | |
| 1353 | break; |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1354 | default: |
| 1355 | goto out; |
| 1356 | } |
| 1357 | |
| 1358 | iommu_queue_inv_dev_entry(iommu, devid); |
| 1359 | iommu_completion_wait(iommu); |
| 1360 | |
| 1361 | out: |
| 1362 | return 0; |
| 1363 | } |
| 1364 | |
Jaswinder Singh Rajput | b25ae67 | 2009-07-01 19:53:14 +0530 | [diff] [blame] | 1365 | static struct notifier_block device_nb = { |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1366 | .notifier_call = device_change_notifier, |
| 1367 | }; |
Joerg Roedel | 355bf55 | 2008-12-08 12:02:41 +0100 | [diff] [blame] | 1368 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1369 | /***************************************************************************** |
| 1370 | * |
| 1371 | * The next functions belong to the dma_ops mapping/unmapping code. |
| 1372 | * |
| 1373 | *****************************************************************************/ |
| 1374 | |
| 1375 | /* |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1376 | * This function checks if the driver got a valid device from the caller to |
| 1377 | * avoid dereferencing invalid pointers. |
| 1378 | */ |
| 1379 | static bool check_device(struct device *dev) |
| 1380 | { |
Joerg Roedel | 420aef8 | 2009-11-23 16:14:57 +0100 | [diff] [blame] | 1381 | u16 bdf; |
| 1382 | struct pci_dev *pcidev; |
| 1383 | |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1384 | if (!dev || !dev->dma_mask) |
| 1385 | return false; |
| 1386 | |
Joerg Roedel | 420aef8 | 2009-11-23 16:14:57 +0100 | [diff] [blame] | 1387 | /* No device or no PCI device */ |
| 1388 | if (!dev || dev->bus != &pci_bus_type) |
| 1389 | return false; |
| 1390 | |
| 1391 | pcidev = to_pci_dev(dev); |
| 1392 | |
| 1393 | bdf = calc_devid(pcidev->bus->number, pcidev->devfn); |
| 1394 | |
| 1395 | /* Out of our scope? */ |
| 1396 | if (bdf > amd_iommu_last_bdf) |
| 1397 | return false; |
| 1398 | |
| 1399 | if (amd_iommu_rlookup_table[bdf] == NULL) |
| 1400 | return false; |
| 1401 | |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1402 | return true; |
| 1403 | } |
| 1404 | |
| 1405 | /* |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 1406 | * In this function the list of preallocated protection domains is traversed to |
| 1407 | * find the domain for a specific device |
| 1408 | */ |
| 1409 | static struct dma_ops_domain *find_protection_domain(u16 devid) |
| 1410 | { |
| 1411 | struct dma_ops_domain *entry, *ret = NULL; |
| 1412 | unsigned long flags; |
| 1413 | |
| 1414 | if (list_empty(&iommu_pd_list)) |
| 1415 | return NULL; |
| 1416 | |
| 1417 | spin_lock_irqsave(&iommu_pd_list_lock, flags); |
| 1418 | |
| 1419 | list_for_each_entry(entry, &iommu_pd_list, list) { |
| 1420 | if (entry->target_dev == devid) { |
| 1421 | ret = entry; |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 1422 | break; |
| 1423 | } |
| 1424 | } |
| 1425 | |
| 1426 | spin_unlock_irqrestore(&iommu_pd_list_lock, flags); |
| 1427 | |
| 1428 | return ret; |
| 1429 | } |
| 1430 | |
| 1431 | /* |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1432 | * In the dma_ops path we only have the struct device. This function |
| 1433 | * finds the corresponding IOMMU, the protection domain and the |
| 1434 | * requestor id for a given device. |
| 1435 | * If the device is not yet associated with a domain this is also done |
| 1436 | * in this function. |
| 1437 | */ |
Joerg Roedel | f99c0f1 | 2009-11-23 16:52:56 +0100 | [diff] [blame] | 1438 | static bool get_device_resources(struct device *dev, |
Joerg Roedel | f99c0f1 | 2009-11-23 16:52:56 +0100 | [diff] [blame] | 1439 | struct protection_domain **domain, |
| 1440 | u16 *bdf) |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1441 | { |
| 1442 | struct dma_ops_domain *dma_dom; |
Joerg Roedel | f3be07d | 2009-11-23 19:43:14 +0100 | [diff] [blame^] | 1443 | struct amd_iommu *iommu; |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1444 | struct pci_dev *pcidev; |
| 1445 | u16 _bdf; |
| 1446 | |
Joerg Roedel | f99c0f1 | 2009-11-23 16:52:56 +0100 | [diff] [blame] | 1447 | if (!check_device(dev)) |
| 1448 | return false; |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1449 | |
Joerg Roedel | f99c0f1 | 2009-11-23 16:52:56 +0100 | [diff] [blame] | 1450 | pcidev = to_pci_dev(dev); |
| 1451 | _bdf = calc_devid(pcidev->bus->number, pcidev->devfn); |
| 1452 | *bdf = amd_iommu_alias_table[_bdf]; |
Joerg Roedel | f3be07d | 2009-11-23 19:43:14 +0100 | [diff] [blame^] | 1453 | iommu = amd_iommu_rlookup_table[*bdf]; |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1454 | *domain = domain_for_device(*bdf); |
Joerg Roedel | f99c0f1 | 2009-11-23 16:52:56 +0100 | [diff] [blame] | 1455 | |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1456 | if (*domain == NULL) { |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 1457 | dma_dom = find_protection_domain(*bdf); |
| 1458 | if (!dma_dom) |
Joerg Roedel | f3be07d | 2009-11-23 19:43:14 +0100 | [diff] [blame^] | 1459 | dma_dom = iommu->default_dom; |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1460 | *domain = &dma_dom->domain; |
Joerg Roedel | f3be07d | 2009-11-23 19:43:14 +0100 | [diff] [blame^] | 1461 | attach_device(iommu, *domain, *bdf); |
Joerg Roedel | e9a22a1 | 2009-06-09 12:00:37 +0200 | [diff] [blame] | 1462 | DUMP_printk("Using protection domain %d for device %s\n", |
| 1463 | (*domain)->id, dev_name(dev)); |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1464 | } |
| 1465 | |
Joerg Roedel | f91ba19 | 2008-11-25 12:56:12 +0100 | [diff] [blame] | 1466 | if (domain_for_device(_bdf) == NULL) |
Joerg Roedel | f3be07d | 2009-11-23 19:43:14 +0100 | [diff] [blame^] | 1467 | attach_device(iommu, *domain, _bdf); |
Joerg Roedel | f91ba19 | 2008-11-25 12:56:12 +0100 | [diff] [blame] | 1468 | |
Joerg Roedel | f99c0f1 | 2009-11-23 16:52:56 +0100 | [diff] [blame] | 1469 | return true; |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1470 | } |
| 1471 | |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 1472 | static void update_device_table(struct protection_domain *domain) |
| 1473 | { |
Joerg Roedel | 2b681fa | 2009-09-03 17:14:57 +0200 | [diff] [blame] | 1474 | unsigned long flags; |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 1475 | int i; |
| 1476 | |
| 1477 | for (i = 0; i <= amd_iommu_last_bdf; ++i) { |
| 1478 | if (amd_iommu_pd_table[i] != domain) |
| 1479 | continue; |
Joerg Roedel | 2b681fa | 2009-09-03 17:14:57 +0200 | [diff] [blame] | 1480 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 1481 | set_dte_entry(i, domain); |
Joerg Roedel | 2b681fa | 2009-09-03 17:14:57 +0200 | [diff] [blame] | 1482 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 1483 | } |
| 1484 | } |
| 1485 | |
| 1486 | static void update_domain(struct protection_domain *domain) |
| 1487 | { |
| 1488 | if (!domain->updated) |
| 1489 | return; |
| 1490 | |
| 1491 | update_device_table(domain); |
| 1492 | flush_devices_by_domain(domain); |
Joerg Roedel | 601367d | 2009-11-20 16:08:55 +0100 | [diff] [blame] | 1493 | iommu_flush_tlb_pde(domain); |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 1494 | |
| 1495 | domain->updated = false; |
| 1496 | } |
| 1497 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1498 | /* |
Joerg Roedel | 50020fb | 2009-09-02 15:38:40 +0200 | [diff] [blame] | 1499 | * This function is used to add another level to an IO page table. Adding |
| 1500 | * another level increases the size of the address space by 9 bits to a size up |
| 1501 | * to 64 bits. |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1502 | */ |
Joerg Roedel | 50020fb | 2009-09-02 15:38:40 +0200 | [diff] [blame] | 1503 | static bool increase_address_space(struct protection_domain *domain, |
| 1504 | gfp_t gfp) |
| 1505 | { |
| 1506 | u64 *pte; |
| 1507 | |
| 1508 | if (domain->mode == PAGE_MODE_6_LEVEL) |
| 1509 | /* address space already 64 bit large */ |
| 1510 | return false; |
| 1511 | |
| 1512 | pte = (void *)get_zeroed_page(gfp); |
| 1513 | if (!pte) |
| 1514 | return false; |
| 1515 | |
| 1516 | *pte = PM_LEVEL_PDE(domain->mode, |
| 1517 | virt_to_phys(domain->pt_root)); |
| 1518 | domain->pt_root = pte; |
| 1519 | domain->mode += 1; |
| 1520 | domain->updated = true; |
| 1521 | |
| 1522 | return true; |
| 1523 | } |
| 1524 | |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 1525 | static u64 *alloc_pte(struct protection_domain *domain, |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 1526 | unsigned long address, |
| 1527 | int end_lvl, |
| 1528 | u64 **pte_page, |
| 1529 | gfp_t gfp) |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1530 | { |
| 1531 | u64 *pte, *page; |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 1532 | int level; |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1533 | |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 1534 | while (address > PM_LEVEL_SIZE(domain->mode)) |
| 1535 | increase_address_space(domain, gfp); |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1536 | |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 1537 | level = domain->mode - 1; |
| 1538 | pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)]; |
| 1539 | |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 1540 | while (level > end_lvl) { |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 1541 | if (!IOMMU_PTE_PRESENT(*pte)) { |
| 1542 | page = (u64 *)get_zeroed_page(gfp); |
| 1543 | if (!page) |
| 1544 | return NULL; |
| 1545 | *pte = PM_LEVEL_PDE(level, virt_to_phys(page)); |
| 1546 | } |
| 1547 | |
| 1548 | level -= 1; |
| 1549 | |
| 1550 | pte = IOMMU_PTE_PAGE(*pte); |
| 1551 | |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 1552 | if (pte_page && level == end_lvl) |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 1553 | *pte_page = pte; |
| 1554 | |
| 1555 | pte = &pte[PM_LEVEL_INDEX(level, address)]; |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1556 | } |
| 1557 | |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1558 | return pte; |
| 1559 | } |
| 1560 | |
| 1561 | /* |
| 1562 | * This function fetches the PTE for a given address in the aperture |
| 1563 | */ |
| 1564 | static u64* dma_ops_get_pte(struct dma_ops_domain *dom, |
| 1565 | unsigned long address) |
| 1566 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1567 | struct aperture_range *aperture; |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1568 | u64 *pte, *pte_page; |
| 1569 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1570 | aperture = dom->aperture[APERTURE_RANGE_INDEX(address)]; |
| 1571 | if (!aperture) |
| 1572 | return NULL; |
| 1573 | |
| 1574 | pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)]; |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1575 | if (!pte) { |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 1576 | pte = alloc_pte(&dom->domain, address, PM_MAP_4k, &pte_page, |
| 1577 | GFP_ATOMIC); |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1578 | aperture->pte_pages[APERTURE_PAGE_INDEX(address)] = pte_page; |
| 1579 | } else |
Joerg Roedel | 8c8c143 | 2009-09-02 17:30:00 +0200 | [diff] [blame] | 1580 | pte += PM_LEVEL_INDEX(0, address); |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1581 | |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 1582 | update_domain(&dom->domain); |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1583 | |
| 1584 | return pte; |
| 1585 | } |
| 1586 | |
| 1587 | /* |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1588 | * This is the generic map function. It maps one 4kb page at paddr to |
| 1589 | * the given address in the DMA address space for the domain. |
| 1590 | */ |
Joerg Roedel | 680525e | 2009-11-23 18:44:42 +0100 | [diff] [blame] | 1591 | static dma_addr_t dma_ops_domain_map(struct dma_ops_domain *dom, |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1592 | unsigned long address, |
| 1593 | phys_addr_t paddr, |
| 1594 | int direction) |
| 1595 | { |
| 1596 | u64 *pte, __pte; |
| 1597 | |
| 1598 | WARN_ON(address > dom->aperture_size); |
| 1599 | |
| 1600 | paddr &= PAGE_MASK; |
| 1601 | |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1602 | pte = dma_ops_get_pte(dom, address); |
Joerg Roedel | 53812c1 | 2009-05-12 12:17:38 +0200 | [diff] [blame] | 1603 | if (!pte) |
FUJITA Tomonori | 8fd524b | 2009-11-15 21:19:53 +0900 | [diff] [blame] | 1604 | return DMA_ERROR_CODE; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1605 | |
| 1606 | __pte = paddr | IOMMU_PTE_P | IOMMU_PTE_FC; |
| 1607 | |
| 1608 | if (direction == DMA_TO_DEVICE) |
| 1609 | __pte |= IOMMU_PTE_IR; |
| 1610 | else if (direction == DMA_FROM_DEVICE) |
| 1611 | __pte |= IOMMU_PTE_IW; |
| 1612 | else if (direction == DMA_BIDIRECTIONAL) |
| 1613 | __pte |= IOMMU_PTE_IR | IOMMU_PTE_IW; |
| 1614 | |
| 1615 | WARN_ON(*pte); |
| 1616 | |
| 1617 | *pte = __pte; |
| 1618 | |
| 1619 | return (dma_addr_t)address; |
| 1620 | } |
| 1621 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1622 | /* |
| 1623 | * The generic unmapping function for on page in the DMA address space. |
| 1624 | */ |
Joerg Roedel | 680525e | 2009-11-23 18:44:42 +0100 | [diff] [blame] | 1625 | static void dma_ops_domain_unmap(struct dma_ops_domain *dom, |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1626 | unsigned long address) |
| 1627 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1628 | struct aperture_range *aperture; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1629 | u64 *pte; |
| 1630 | |
| 1631 | if (address >= dom->aperture_size) |
| 1632 | return; |
| 1633 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1634 | aperture = dom->aperture[APERTURE_RANGE_INDEX(address)]; |
| 1635 | if (!aperture) |
| 1636 | return; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1637 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1638 | pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)]; |
| 1639 | if (!pte) |
| 1640 | return; |
| 1641 | |
Joerg Roedel | 8c8c143 | 2009-09-02 17:30:00 +0200 | [diff] [blame] | 1642 | pte += PM_LEVEL_INDEX(0, address); |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1643 | |
| 1644 | WARN_ON(!*pte); |
| 1645 | |
| 1646 | *pte = 0ULL; |
| 1647 | } |
| 1648 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1649 | /* |
| 1650 | * This function contains common code for mapping of a physically |
Joerg Roedel | 24f8116 | 2008-12-08 14:25:39 +0100 | [diff] [blame] | 1651 | * contiguous memory region into DMA address space. It is used by all |
| 1652 | * mapping functions provided with this IOMMU driver. |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1653 | * Must be called with the domain lock held. |
| 1654 | */ |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1655 | static dma_addr_t __map_single(struct device *dev, |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1656 | struct dma_ops_domain *dma_dom, |
| 1657 | phys_addr_t paddr, |
| 1658 | size_t size, |
Joerg Roedel | 6d4f343f | 2008-09-04 19:18:02 +0200 | [diff] [blame] | 1659 | int dir, |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1660 | bool align, |
| 1661 | u64 dma_mask) |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1662 | { |
| 1663 | dma_addr_t offset = paddr & ~PAGE_MASK; |
Joerg Roedel | 53812c1 | 2009-05-12 12:17:38 +0200 | [diff] [blame] | 1664 | dma_addr_t address, start, ret; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1665 | unsigned int pages; |
Joerg Roedel | 6d4f343f | 2008-09-04 19:18:02 +0200 | [diff] [blame] | 1666 | unsigned long align_mask = 0; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1667 | int i; |
| 1668 | |
Joerg Roedel | e3c449f | 2008-10-15 22:02:11 -0700 | [diff] [blame] | 1669 | pages = iommu_num_pages(paddr, size, PAGE_SIZE); |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1670 | paddr &= PAGE_MASK; |
| 1671 | |
Joerg Roedel | 8ecaf8f | 2008-12-12 16:13:04 +0100 | [diff] [blame] | 1672 | INC_STATS_COUNTER(total_map_requests); |
| 1673 | |
Joerg Roedel | c185897 | 2008-12-12 15:42:39 +0100 | [diff] [blame] | 1674 | if (pages > 1) |
| 1675 | INC_STATS_COUNTER(cross_page); |
| 1676 | |
Joerg Roedel | 6d4f343f | 2008-09-04 19:18:02 +0200 | [diff] [blame] | 1677 | if (align) |
| 1678 | align_mask = (1UL << get_order(size)) - 1; |
| 1679 | |
Joerg Roedel | 11b8388 | 2009-05-19 10:23:15 +0200 | [diff] [blame] | 1680 | retry: |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1681 | address = dma_ops_alloc_addresses(dev, dma_dom, pages, align_mask, |
| 1682 | dma_mask); |
FUJITA Tomonori | 8fd524b | 2009-11-15 21:19:53 +0900 | [diff] [blame] | 1683 | if (unlikely(address == DMA_ERROR_CODE)) { |
Joerg Roedel | 11b8388 | 2009-05-19 10:23:15 +0200 | [diff] [blame] | 1684 | /* |
| 1685 | * setting next_address here will let the address |
| 1686 | * allocator only scan the new allocated range in the |
| 1687 | * first run. This is a small optimization. |
| 1688 | */ |
| 1689 | dma_dom->next_address = dma_dom->aperture_size; |
| 1690 | |
Joerg Roedel | 576175c | 2009-11-23 19:08:46 +0100 | [diff] [blame] | 1691 | if (alloc_new_range(dma_dom, false, GFP_ATOMIC)) |
Joerg Roedel | 11b8388 | 2009-05-19 10:23:15 +0200 | [diff] [blame] | 1692 | goto out; |
| 1693 | |
| 1694 | /* |
| 1695 | * aperture was sucessfully enlarged by 128 MB, try |
| 1696 | * allocation again |
| 1697 | */ |
| 1698 | goto retry; |
| 1699 | } |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1700 | |
| 1701 | start = address; |
| 1702 | for (i = 0; i < pages; ++i) { |
Joerg Roedel | 680525e | 2009-11-23 18:44:42 +0100 | [diff] [blame] | 1703 | ret = dma_ops_domain_map(dma_dom, start, paddr, dir); |
FUJITA Tomonori | 8fd524b | 2009-11-15 21:19:53 +0900 | [diff] [blame] | 1704 | if (ret == DMA_ERROR_CODE) |
Joerg Roedel | 53812c1 | 2009-05-12 12:17:38 +0200 | [diff] [blame] | 1705 | goto out_unmap; |
| 1706 | |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1707 | paddr += PAGE_SIZE; |
| 1708 | start += PAGE_SIZE; |
| 1709 | } |
| 1710 | address += offset; |
| 1711 | |
Joerg Roedel | 5774f7c | 2008-12-12 15:57:30 +0100 | [diff] [blame] | 1712 | ADD_STATS_COUNTER(alloced_io_mem, size); |
| 1713 | |
FUJITA Tomonori | afa9fdc | 2008-09-20 01:23:30 +0900 | [diff] [blame] | 1714 | if (unlikely(dma_dom->need_flush && !amd_iommu_unmap_flush)) { |
Joerg Roedel | dcd1e92 | 2009-11-20 15:30:58 +0100 | [diff] [blame] | 1715 | iommu_flush_tlb(&dma_dom->domain); |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 1716 | dma_dom->need_flush = false; |
Joerg Roedel | 318afd4 | 2009-11-23 18:32:38 +0100 | [diff] [blame] | 1717 | } else if (unlikely(amd_iommu_np_cache)) |
Joerg Roedel | 6de8ad9 | 2009-11-23 18:30:32 +0100 | [diff] [blame] | 1718 | iommu_flush_pages(&dma_dom->domain, address, size); |
Joerg Roedel | 270cab24 | 2008-09-04 15:49:46 +0200 | [diff] [blame] | 1719 | |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1720 | out: |
| 1721 | return address; |
Joerg Roedel | 53812c1 | 2009-05-12 12:17:38 +0200 | [diff] [blame] | 1722 | |
| 1723 | out_unmap: |
| 1724 | |
| 1725 | for (--i; i >= 0; --i) { |
| 1726 | start -= PAGE_SIZE; |
Joerg Roedel | 680525e | 2009-11-23 18:44:42 +0100 | [diff] [blame] | 1727 | dma_ops_domain_unmap(dma_dom, start); |
Joerg Roedel | 53812c1 | 2009-05-12 12:17:38 +0200 | [diff] [blame] | 1728 | } |
| 1729 | |
| 1730 | dma_ops_free_addresses(dma_dom, address, pages); |
| 1731 | |
FUJITA Tomonori | 8fd524b | 2009-11-15 21:19:53 +0900 | [diff] [blame] | 1732 | return DMA_ERROR_CODE; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1733 | } |
| 1734 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1735 | /* |
| 1736 | * Does the reverse of the __map_single function. Must be called with |
| 1737 | * the domain lock held too |
| 1738 | */ |
Joerg Roedel | cd8c82e | 2009-11-23 19:33:56 +0100 | [diff] [blame] | 1739 | static void __unmap_single(struct dma_ops_domain *dma_dom, |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1740 | dma_addr_t dma_addr, |
| 1741 | size_t size, |
| 1742 | int dir) |
| 1743 | { |
| 1744 | dma_addr_t i, start; |
| 1745 | unsigned int pages; |
| 1746 | |
FUJITA Tomonori | 8fd524b | 2009-11-15 21:19:53 +0900 | [diff] [blame] | 1747 | if ((dma_addr == DMA_ERROR_CODE) || |
Joerg Roedel | b8d9905 | 2008-12-08 14:40:26 +0100 | [diff] [blame] | 1748 | (dma_addr + size > dma_dom->aperture_size)) |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1749 | return; |
| 1750 | |
Joerg Roedel | e3c449f | 2008-10-15 22:02:11 -0700 | [diff] [blame] | 1751 | pages = iommu_num_pages(dma_addr, size, PAGE_SIZE); |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1752 | dma_addr &= PAGE_MASK; |
| 1753 | start = dma_addr; |
| 1754 | |
| 1755 | for (i = 0; i < pages; ++i) { |
Joerg Roedel | 680525e | 2009-11-23 18:44:42 +0100 | [diff] [blame] | 1756 | dma_ops_domain_unmap(dma_dom, start); |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1757 | start += PAGE_SIZE; |
| 1758 | } |
| 1759 | |
Joerg Roedel | 5774f7c | 2008-12-12 15:57:30 +0100 | [diff] [blame] | 1760 | SUB_STATS_COUNTER(alloced_io_mem, size); |
| 1761 | |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1762 | dma_ops_free_addresses(dma_dom, dma_addr, pages); |
Joerg Roedel | 270cab24 | 2008-09-04 15:49:46 +0200 | [diff] [blame] | 1763 | |
Joerg Roedel | 80be308 | 2008-11-06 14:59:05 +0100 | [diff] [blame] | 1764 | if (amd_iommu_unmap_flush || dma_dom->need_flush) { |
Joerg Roedel | 6de8ad9 | 2009-11-23 18:30:32 +0100 | [diff] [blame] | 1765 | iommu_flush_pages(&dma_dom->domain, dma_addr, size); |
Joerg Roedel | 80be308 | 2008-11-06 14:59:05 +0100 | [diff] [blame] | 1766 | dma_dom->need_flush = false; |
| 1767 | } |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1768 | } |
| 1769 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1770 | /* |
| 1771 | * The exported map_single function for dma_ops. |
| 1772 | */ |
FUJITA Tomonori | 5149136 | 2009-01-05 23:47:25 +0900 | [diff] [blame] | 1773 | static dma_addr_t map_page(struct device *dev, struct page *page, |
| 1774 | unsigned long offset, size_t size, |
| 1775 | enum dma_data_direction dir, |
| 1776 | struct dma_attrs *attrs) |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1777 | { |
| 1778 | unsigned long flags; |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1779 | struct protection_domain *domain; |
| 1780 | u16 devid; |
| 1781 | dma_addr_t addr; |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1782 | u64 dma_mask; |
FUJITA Tomonori | 5149136 | 2009-01-05 23:47:25 +0900 | [diff] [blame] | 1783 | phys_addr_t paddr = page_to_phys(page) + offset; |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1784 | |
Joerg Roedel | 0f2a86f | 2008-12-12 15:05:16 +0100 | [diff] [blame] | 1785 | INC_STATS_COUNTER(cnt_map_single); |
| 1786 | |
Joerg Roedel | f3be07d | 2009-11-23 19:43:14 +0100 | [diff] [blame^] | 1787 | if (!get_device_resources(dev, &domain, &devid)) |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1788 | /* device not handled by any AMD IOMMU */ |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1789 | return (dma_addr_t)paddr; |
| 1790 | |
Joerg Roedel | f99c0f1 | 2009-11-23 16:52:56 +0100 | [diff] [blame] | 1791 | dma_mask = *dev->dma_mask; |
| 1792 | |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1793 | if (!dma_ops_domain(domain)) |
FUJITA Tomonori | 8fd524b | 2009-11-15 21:19:53 +0900 | [diff] [blame] | 1794 | return DMA_ERROR_CODE; |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1795 | |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1796 | spin_lock_irqsave(&domain->lock, flags); |
Joerg Roedel | cd8c82e | 2009-11-23 19:33:56 +0100 | [diff] [blame] | 1797 | addr = __map_single(dev, domain->priv, paddr, size, dir, false, |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1798 | dma_mask); |
FUJITA Tomonori | 8fd524b | 2009-11-15 21:19:53 +0900 | [diff] [blame] | 1799 | if (addr == DMA_ERROR_CODE) |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1800 | goto out; |
| 1801 | |
Joerg Roedel | 0518a3a | 2009-11-20 16:00:05 +0100 | [diff] [blame] | 1802 | iommu_flush_complete(domain); |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1803 | |
| 1804 | out: |
| 1805 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1806 | |
| 1807 | return addr; |
| 1808 | } |
| 1809 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1810 | /* |
| 1811 | * The exported unmap_single function for dma_ops. |
| 1812 | */ |
FUJITA Tomonori | 5149136 | 2009-01-05 23:47:25 +0900 | [diff] [blame] | 1813 | static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size, |
| 1814 | enum dma_data_direction dir, struct dma_attrs *attrs) |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1815 | { |
| 1816 | unsigned long flags; |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1817 | struct protection_domain *domain; |
| 1818 | u16 devid; |
| 1819 | |
Joerg Roedel | 146a691 | 2008-12-12 15:07:12 +0100 | [diff] [blame] | 1820 | INC_STATS_COUNTER(cnt_unmap_single); |
| 1821 | |
Joerg Roedel | f3be07d | 2009-11-23 19:43:14 +0100 | [diff] [blame^] | 1822 | if (!get_device_resources(dev, &domain, &devid)) |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1823 | /* device not handled by any AMD IOMMU */ |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1824 | return; |
| 1825 | |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1826 | if (!dma_ops_domain(domain)) |
| 1827 | return; |
| 1828 | |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1829 | spin_lock_irqsave(&domain->lock, flags); |
| 1830 | |
Joerg Roedel | cd8c82e | 2009-11-23 19:33:56 +0100 | [diff] [blame] | 1831 | __unmap_single(domain->priv, dma_addr, size, dir); |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1832 | |
Joerg Roedel | 0518a3a | 2009-11-20 16:00:05 +0100 | [diff] [blame] | 1833 | iommu_flush_complete(domain); |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1834 | |
| 1835 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1836 | } |
| 1837 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1838 | /* |
| 1839 | * This is a special map_sg function which is used if we should map a |
| 1840 | * device which is not handled by an AMD IOMMU in the system. |
| 1841 | */ |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1842 | static int map_sg_no_iommu(struct device *dev, struct scatterlist *sglist, |
| 1843 | int nelems, int dir) |
| 1844 | { |
| 1845 | struct scatterlist *s; |
| 1846 | int i; |
| 1847 | |
| 1848 | for_each_sg(sglist, s, nelems, i) { |
| 1849 | s->dma_address = (dma_addr_t)sg_phys(s); |
| 1850 | s->dma_length = s->length; |
| 1851 | } |
| 1852 | |
| 1853 | return nelems; |
| 1854 | } |
| 1855 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1856 | /* |
| 1857 | * The exported map_sg function for dma_ops (handles scatter-gather |
| 1858 | * lists). |
| 1859 | */ |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1860 | static int map_sg(struct device *dev, struct scatterlist *sglist, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 1861 | int nelems, enum dma_data_direction dir, |
| 1862 | struct dma_attrs *attrs) |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1863 | { |
| 1864 | unsigned long flags; |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1865 | struct protection_domain *domain; |
| 1866 | u16 devid; |
| 1867 | int i; |
| 1868 | struct scatterlist *s; |
| 1869 | phys_addr_t paddr; |
| 1870 | int mapped_elems = 0; |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1871 | u64 dma_mask; |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1872 | |
Joerg Roedel | d03f067a | 2008-12-12 15:09:48 +0100 | [diff] [blame] | 1873 | INC_STATS_COUNTER(cnt_map_sg); |
| 1874 | |
Joerg Roedel | f3be07d | 2009-11-23 19:43:14 +0100 | [diff] [blame^] | 1875 | if (!get_device_resources(dev, &domain, &devid)) |
Joerg Roedel | f99c0f1 | 2009-11-23 16:52:56 +0100 | [diff] [blame] | 1876 | return map_sg_no_iommu(dev, sglist, nelems, dir); |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1877 | |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1878 | dma_mask = *dev->dma_mask; |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1879 | |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1880 | if (!dma_ops_domain(domain)) |
| 1881 | return 0; |
| 1882 | |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1883 | spin_lock_irqsave(&domain->lock, flags); |
| 1884 | |
| 1885 | for_each_sg(sglist, s, nelems, i) { |
| 1886 | paddr = sg_phys(s); |
| 1887 | |
Joerg Roedel | cd8c82e | 2009-11-23 19:33:56 +0100 | [diff] [blame] | 1888 | s->dma_address = __map_single(dev, domain->priv, |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1889 | paddr, s->length, dir, false, |
| 1890 | dma_mask); |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1891 | |
| 1892 | if (s->dma_address) { |
| 1893 | s->dma_length = s->length; |
| 1894 | mapped_elems++; |
| 1895 | } else |
| 1896 | goto unmap; |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1897 | } |
| 1898 | |
Joerg Roedel | 0518a3a | 2009-11-20 16:00:05 +0100 | [diff] [blame] | 1899 | iommu_flush_complete(domain); |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1900 | |
| 1901 | out: |
| 1902 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1903 | |
| 1904 | return mapped_elems; |
| 1905 | unmap: |
| 1906 | for_each_sg(sglist, s, mapped_elems, i) { |
| 1907 | if (s->dma_address) |
Joerg Roedel | cd8c82e | 2009-11-23 19:33:56 +0100 | [diff] [blame] | 1908 | __unmap_single(domain->priv, s->dma_address, |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1909 | s->dma_length, dir); |
| 1910 | s->dma_address = s->dma_length = 0; |
| 1911 | } |
| 1912 | |
| 1913 | mapped_elems = 0; |
| 1914 | |
| 1915 | goto out; |
| 1916 | } |
| 1917 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1918 | /* |
| 1919 | * The exported map_sg function for dma_ops (handles scatter-gather |
| 1920 | * lists). |
| 1921 | */ |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1922 | static void unmap_sg(struct device *dev, struct scatterlist *sglist, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 1923 | int nelems, enum dma_data_direction dir, |
| 1924 | struct dma_attrs *attrs) |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1925 | { |
| 1926 | unsigned long flags; |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1927 | struct protection_domain *domain; |
| 1928 | struct scatterlist *s; |
| 1929 | u16 devid; |
| 1930 | int i; |
| 1931 | |
Joerg Roedel | 55877a6 | 2008-12-12 15:12:14 +0100 | [diff] [blame] | 1932 | INC_STATS_COUNTER(cnt_unmap_sg); |
| 1933 | |
Joerg Roedel | f3be07d | 2009-11-23 19:43:14 +0100 | [diff] [blame^] | 1934 | if (!get_device_resources(dev, &domain, &devid)) |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1935 | return; |
| 1936 | |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1937 | if (!dma_ops_domain(domain)) |
| 1938 | return; |
| 1939 | |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1940 | spin_lock_irqsave(&domain->lock, flags); |
| 1941 | |
| 1942 | for_each_sg(sglist, s, nelems, i) { |
Joerg Roedel | cd8c82e | 2009-11-23 19:33:56 +0100 | [diff] [blame] | 1943 | __unmap_single(domain->priv, s->dma_address, |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1944 | s->dma_length, dir); |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1945 | s->dma_address = s->dma_length = 0; |
| 1946 | } |
| 1947 | |
Joerg Roedel | 0518a3a | 2009-11-20 16:00:05 +0100 | [diff] [blame] | 1948 | iommu_flush_complete(domain); |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1949 | |
| 1950 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1951 | } |
| 1952 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1953 | /* |
| 1954 | * The exported alloc_coherent function for dma_ops. |
| 1955 | */ |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1956 | static void *alloc_coherent(struct device *dev, size_t size, |
| 1957 | dma_addr_t *dma_addr, gfp_t flag) |
| 1958 | { |
| 1959 | unsigned long flags; |
| 1960 | void *virt_addr; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1961 | struct protection_domain *domain; |
| 1962 | u16 devid; |
| 1963 | phys_addr_t paddr; |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1964 | u64 dma_mask = dev->coherent_dma_mask; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1965 | |
Joerg Roedel | c8f0fb3 | 2008-12-12 15:14:21 +0100 | [diff] [blame] | 1966 | INC_STATS_COUNTER(cnt_alloc_coherent); |
| 1967 | |
Joerg Roedel | f3be07d | 2009-11-23 19:43:14 +0100 | [diff] [blame^] | 1968 | if (!get_device_resources(dev, &domain, &devid)) { |
Joerg Roedel | f99c0f1 | 2009-11-23 16:52:56 +0100 | [diff] [blame] | 1969 | virt_addr = (void *)__get_free_pages(flag, get_order(size)); |
| 1970 | *dma_addr = __pa(virt_addr); |
| 1971 | return virt_addr; |
| 1972 | } |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1973 | |
Joerg Roedel | f99c0f1 | 2009-11-23 16:52:56 +0100 | [diff] [blame] | 1974 | dma_mask = dev->coherent_dma_mask; |
| 1975 | flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32); |
| 1976 | flag |= __GFP_ZERO; |
FUJITA Tomonori | 13d9fea | 2008-09-10 20:19:40 +0900 | [diff] [blame] | 1977 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1978 | virt_addr = (void *)__get_free_pages(flag, get_order(size)); |
| 1979 | if (!virt_addr) |
Jaswinder Singh Rajput | b25ae67 | 2009-07-01 19:53:14 +0530 | [diff] [blame] | 1980 | return NULL; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1981 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1982 | paddr = virt_to_phys(virt_addr); |
| 1983 | |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1984 | if (!dma_ops_domain(domain)) |
| 1985 | goto out_free; |
| 1986 | |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1987 | if (!dma_mask) |
| 1988 | dma_mask = *dev->dma_mask; |
| 1989 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1990 | spin_lock_irqsave(&domain->lock, flags); |
| 1991 | |
Joerg Roedel | cd8c82e | 2009-11-23 19:33:56 +0100 | [diff] [blame] | 1992 | *dma_addr = __map_single(dev, domain->priv, paddr, |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1993 | size, DMA_BIDIRECTIONAL, true, dma_mask); |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1994 | |
FUJITA Tomonori | 8fd524b | 2009-11-15 21:19:53 +0900 | [diff] [blame] | 1995 | if (*dma_addr == DMA_ERROR_CODE) { |
Jiri Slaby | 367d04c | 2009-05-28 09:54:48 +0200 | [diff] [blame] | 1996 | spin_unlock_irqrestore(&domain->lock, flags); |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1997 | goto out_free; |
Jiri Slaby | 367d04c | 2009-05-28 09:54:48 +0200 | [diff] [blame] | 1998 | } |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1999 | |
Joerg Roedel | 0518a3a | 2009-11-20 16:00:05 +0100 | [diff] [blame] | 2000 | iommu_flush_complete(domain); |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2001 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2002 | spin_unlock_irqrestore(&domain->lock, flags); |
| 2003 | |
| 2004 | return virt_addr; |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 2005 | |
| 2006 | out_free: |
| 2007 | |
| 2008 | free_pages((unsigned long)virt_addr, get_order(size)); |
| 2009 | |
| 2010 | return NULL; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2011 | } |
| 2012 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 2013 | /* |
| 2014 | * The exported free_coherent function for dma_ops. |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 2015 | */ |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2016 | static void free_coherent(struct device *dev, size_t size, |
| 2017 | void *virt_addr, dma_addr_t dma_addr) |
| 2018 | { |
| 2019 | unsigned long flags; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2020 | struct protection_domain *domain; |
| 2021 | u16 devid; |
| 2022 | |
Joerg Roedel | 5d31ee7 | 2008-12-12 15:16:38 +0100 | [diff] [blame] | 2023 | INC_STATS_COUNTER(cnt_free_coherent); |
| 2024 | |
Joerg Roedel | f3be07d | 2009-11-23 19:43:14 +0100 | [diff] [blame^] | 2025 | if (!get_device_resources(dev, &domain, &devid)) |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2026 | goto free_mem; |
| 2027 | |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 2028 | if (!dma_ops_domain(domain)) |
| 2029 | goto free_mem; |
| 2030 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2031 | spin_lock_irqsave(&domain->lock, flags); |
| 2032 | |
Joerg Roedel | cd8c82e | 2009-11-23 19:33:56 +0100 | [diff] [blame] | 2033 | __unmap_single(domain->priv, dma_addr, size, DMA_BIDIRECTIONAL); |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2034 | |
Joerg Roedel | 0518a3a | 2009-11-20 16:00:05 +0100 | [diff] [blame] | 2035 | iommu_flush_complete(domain); |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2036 | |
| 2037 | spin_unlock_irqrestore(&domain->lock, flags); |
| 2038 | |
| 2039 | free_mem: |
| 2040 | free_pages((unsigned long)virt_addr, get_order(size)); |
| 2041 | } |
| 2042 | |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 2043 | /* |
Joerg Roedel | b39ba6a | 2008-09-09 18:40:46 +0200 | [diff] [blame] | 2044 | * This function is called by the DMA layer to find out if we can handle a |
| 2045 | * particular device. It is part of the dma_ops. |
| 2046 | */ |
| 2047 | static int amd_iommu_dma_supported(struct device *dev, u64 mask) |
| 2048 | { |
Joerg Roedel | 420aef8 | 2009-11-23 16:14:57 +0100 | [diff] [blame] | 2049 | return check_device(dev); |
Joerg Roedel | b39ba6a | 2008-09-09 18:40:46 +0200 | [diff] [blame] | 2050 | } |
| 2051 | |
| 2052 | /* |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 2053 | * The function for pre-allocating protection domains. |
| 2054 | * |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 2055 | * If the driver core informs the DMA layer if a driver grabs a device |
| 2056 | * we don't need to preallocate the protection domains anymore. |
| 2057 | * For now we have to. |
| 2058 | */ |
Jaswinder Singh Rajput | 0e93dd8 | 2008-12-29 21:45:22 +0530 | [diff] [blame] | 2059 | static void prealloc_protection_domains(void) |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 2060 | { |
| 2061 | struct pci_dev *dev = NULL; |
| 2062 | struct dma_ops_domain *dma_dom; |
| 2063 | struct amd_iommu *iommu; |
Joerg Roedel | be83129 | 2009-11-23 12:50:00 +0100 | [diff] [blame] | 2064 | u16 devid, __devid; |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 2065 | |
| 2066 | while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { |
Joerg Roedel | be83129 | 2009-11-23 12:50:00 +0100 | [diff] [blame] | 2067 | __devid = devid = calc_devid(dev->bus->number, dev->devfn); |
Joerg Roedel | 3a61ec3 | 2008-07-25 13:07:50 +0200 | [diff] [blame] | 2068 | if (devid > amd_iommu_last_bdf) |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 2069 | continue; |
| 2070 | devid = amd_iommu_alias_table[devid]; |
| 2071 | if (domain_for_device(devid)) |
| 2072 | continue; |
| 2073 | iommu = amd_iommu_rlookup_table[devid]; |
| 2074 | if (!iommu) |
| 2075 | continue; |
Joerg Roedel | d9cfed9 | 2009-05-19 12:16:29 +0200 | [diff] [blame] | 2076 | dma_dom = dma_ops_domain_alloc(iommu); |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 2077 | if (!dma_dom) |
| 2078 | continue; |
| 2079 | init_unity_mappings_for_device(dma_dom, devid); |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 2080 | dma_dom->target_dev = devid; |
| 2081 | |
Joerg Roedel | be83129 | 2009-11-23 12:50:00 +0100 | [diff] [blame] | 2082 | attach_device(iommu, &dma_dom->domain, devid); |
| 2083 | if (__devid != devid) |
| 2084 | attach_device(iommu, &dma_dom->domain, __devid); |
| 2085 | |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 2086 | list_add_tail(&dma_dom->list, &iommu_pd_list); |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 2087 | } |
| 2088 | } |
| 2089 | |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 2090 | static struct dma_map_ops amd_iommu_dma_ops = { |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2091 | .alloc_coherent = alloc_coherent, |
| 2092 | .free_coherent = free_coherent, |
FUJITA Tomonori | 5149136 | 2009-01-05 23:47:25 +0900 | [diff] [blame] | 2093 | .map_page = map_page, |
| 2094 | .unmap_page = unmap_page, |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2095 | .map_sg = map_sg, |
| 2096 | .unmap_sg = unmap_sg, |
Joerg Roedel | b39ba6a | 2008-09-09 18:40:46 +0200 | [diff] [blame] | 2097 | .dma_supported = amd_iommu_dma_supported, |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2098 | }; |
| 2099 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 2100 | /* |
| 2101 | * The function which clues the AMD IOMMU driver into dma_ops. |
| 2102 | */ |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2103 | int __init amd_iommu_init_dma_ops(void) |
| 2104 | { |
| 2105 | struct amd_iommu *iommu; |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2106 | int ret; |
| 2107 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 2108 | /* |
| 2109 | * first allocate a default protection domain for every IOMMU we |
| 2110 | * found in the system. Devices not assigned to any other |
| 2111 | * protection domain will be assigned to the default one. |
| 2112 | */ |
Joerg Roedel | 3bd2217 | 2009-05-04 15:06:20 +0200 | [diff] [blame] | 2113 | for_each_iommu(iommu) { |
Joerg Roedel | d9cfed9 | 2009-05-19 12:16:29 +0200 | [diff] [blame] | 2114 | iommu->default_dom = dma_ops_domain_alloc(iommu); |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2115 | if (iommu->default_dom == NULL) |
| 2116 | return -ENOMEM; |
Joerg Roedel | e2dc14a | 2008-12-10 18:48:59 +0100 | [diff] [blame] | 2117 | iommu->default_dom->domain.flags |= PD_DEFAULT_MASK; |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2118 | ret = iommu_init_unity_mappings(iommu); |
| 2119 | if (ret) |
| 2120 | goto free_domains; |
| 2121 | } |
| 2122 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 2123 | /* |
| 2124 | * If device isolation is enabled, pre-allocate the protection |
| 2125 | * domains for each device. |
| 2126 | */ |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2127 | if (amd_iommu_isolate) |
| 2128 | prealloc_protection_domains(); |
| 2129 | |
| 2130 | iommu_detected = 1; |
FUJITA Tomonori | 75f1cdf | 2009-11-10 19:46:20 +0900 | [diff] [blame] | 2131 | swiotlb = 0; |
Ingo Molnar | 92af4e2 | 2008-06-27 10:48:16 +0200 | [diff] [blame] | 2132 | #ifdef CONFIG_GART_IOMMU |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2133 | gart_iommu_aperture_disabled = 1; |
| 2134 | gart_iommu_aperture = 0; |
Ingo Molnar | 92af4e2 | 2008-06-27 10:48:16 +0200 | [diff] [blame] | 2135 | #endif |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2136 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 2137 | /* Make the driver finally visible to the drivers */ |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2138 | dma_ops = &amd_iommu_dma_ops; |
| 2139 | |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 2140 | register_iommu(&amd_iommu_ops); |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 2141 | |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 2142 | bus_register_notifier(&pci_bus_type, &device_nb); |
| 2143 | |
Joerg Roedel | 7f26508 | 2008-12-12 13:50:21 +0100 | [diff] [blame] | 2144 | amd_iommu_stats_init(); |
| 2145 | |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2146 | return 0; |
| 2147 | |
| 2148 | free_domains: |
| 2149 | |
Joerg Roedel | 3bd2217 | 2009-05-04 15:06:20 +0200 | [diff] [blame] | 2150 | for_each_iommu(iommu) { |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2151 | if (iommu->default_dom) |
| 2152 | dma_ops_domain_free(iommu->default_dom); |
| 2153 | } |
| 2154 | |
| 2155 | return ret; |
| 2156 | } |
Joerg Roedel | 6d98cd8 | 2008-12-08 12:05:55 +0100 | [diff] [blame] | 2157 | |
| 2158 | /***************************************************************************** |
| 2159 | * |
| 2160 | * The following functions belong to the exported interface of AMD IOMMU |
| 2161 | * |
| 2162 | * This interface allows access to lower level functions of the IOMMU |
| 2163 | * like protection domain handling and assignement of devices to domains |
| 2164 | * which is not possible with the dma_ops interface. |
| 2165 | * |
| 2166 | *****************************************************************************/ |
| 2167 | |
Joerg Roedel | 6d98cd8 | 2008-12-08 12:05:55 +0100 | [diff] [blame] | 2168 | static void cleanup_domain(struct protection_domain *domain) |
| 2169 | { |
| 2170 | unsigned long flags; |
| 2171 | u16 devid; |
| 2172 | |
| 2173 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 2174 | |
| 2175 | for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) |
| 2176 | if (amd_iommu_pd_table[devid] == domain) |
| 2177 | __detach_device(domain, devid); |
| 2178 | |
| 2179 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 2180 | } |
| 2181 | |
Joerg Roedel | 2650815 | 2009-08-26 16:52:40 +0200 | [diff] [blame] | 2182 | static void protection_domain_free(struct protection_domain *domain) |
| 2183 | { |
| 2184 | if (!domain) |
| 2185 | return; |
| 2186 | |
Joerg Roedel | aeb26f5 | 2009-11-20 16:44:01 +0100 | [diff] [blame] | 2187 | del_domain_from_list(domain); |
| 2188 | |
Joerg Roedel | 2650815 | 2009-08-26 16:52:40 +0200 | [diff] [blame] | 2189 | if (domain->id) |
| 2190 | domain_id_free(domain->id); |
| 2191 | |
| 2192 | kfree(domain); |
| 2193 | } |
| 2194 | |
| 2195 | static struct protection_domain *protection_domain_alloc(void) |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 2196 | { |
| 2197 | struct protection_domain *domain; |
| 2198 | |
| 2199 | domain = kzalloc(sizeof(*domain), GFP_KERNEL); |
| 2200 | if (!domain) |
Joerg Roedel | 2650815 | 2009-08-26 16:52:40 +0200 | [diff] [blame] | 2201 | return NULL; |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 2202 | |
| 2203 | spin_lock_init(&domain->lock); |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 2204 | domain->id = domain_id_alloc(); |
| 2205 | if (!domain->id) |
Joerg Roedel | 2650815 | 2009-08-26 16:52:40 +0200 | [diff] [blame] | 2206 | goto out_err; |
| 2207 | |
Joerg Roedel | aeb26f5 | 2009-11-20 16:44:01 +0100 | [diff] [blame] | 2208 | add_domain_to_list(domain); |
| 2209 | |
Joerg Roedel | 2650815 | 2009-08-26 16:52:40 +0200 | [diff] [blame] | 2210 | return domain; |
| 2211 | |
| 2212 | out_err: |
| 2213 | kfree(domain); |
| 2214 | |
| 2215 | return NULL; |
| 2216 | } |
| 2217 | |
| 2218 | static int amd_iommu_domain_init(struct iommu_domain *dom) |
| 2219 | { |
| 2220 | struct protection_domain *domain; |
| 2221 | |
| 2222 | domain = protection_domain_alloc(); |
| 2223 | if (!domain) |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 2224 | goto out_free; |
Joerg Roedel | 2650815 | 2009-08-26 16:52:40 +0200 | [diff] [blame] | 2225 | |
| 2226 | domain->mode = PAGE_MODE_3_LEVEL; |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 2227 | domain->pt_root = (void *)get_zeroed_page(GFP_KERNEL); |
| 2228 | if (!domain->pt_root) |
| 2229 | goto out_free; |
| 2230 | |
| 2231 | dom->priv = domain; |
| 2232 | |
| 2233 | return 0; |
| 2234 | |
| 2235 | out_free: |
Joerg Roedel | 2650815 | 2009-08-26 16:52:40 +0200 | [diff] [blame] | 2236 | protection_domain_free(domain); |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 2237 | |
| 2238 | return -ENOMEM; |
| 2239 | } |
| 2240 | |
Joerg Roedel | 98383fc | 2008-12-02 18:34:12 +0100 | [diff] [blame] | 2241 | static void amd_iommu_domain_destroy(struct iommu_domain *dom) |
| 2242 | { |
| 2243 | struct protection_domain *domain = dom->priv; |
| 2244 | |
| 2245 | if (!domain) |
| 2246 | return; |
| 2247 | |
| 2248 | if (domain->dev_cnt > 0) |
| 2249 | cleanup_domain(domain); |
| 2250 | |
| 2251 | BUG_ON(domain->dev_cnt != 0); |
| 2252 | |
| 2253 | free_pagetable(domain); |
| 2254 | |
| 2255 | domain_id_free(domain->id); |
| 2256 | |
| 2257 | kfree(domain); |
| 2258 | |
| 2259 | dom->priv = NULL; |
| 2260 | } |
| 2261 | |
Joerg Roedel | 684f288 | 2008-12-08 12:07:44 +0100 | [diff] [blame] | 2262 | static void amd_iommu_detach_device(struct iommu_domain *dom, |
| 2263 | struct device *dev) |
| 2264 | { |
| 2265 | struct protection_domain *domain = dom->priv; |
| 2266 | struct amd_iommu *iommu; |
| 2267 | struct pci_dev *pdev; |
| 2268 | u16 devid; |
| 2269 | |
| 2270 | if (dev->bus != &pci_bus_type) |
| 2271 | return; |
| 2272 | |
| 2273 | pdev = to_pci_dev(dev); |
| 2274 | |
| 2275 | devid = calc_devid(pdev->bus->number, pdev->devfn); |
| 2276 | |
| 2277 | if (devid > 0) |
| 2278 | detach_device(domain, devid); |
| 2279 | |
| 2280 | iommu = amd_iommu_rlookup_table[devid]; |
| 2281 | if (!iommu) |
| 2282 | return; |
| 2283 | |
| 2284 | iommu_queue_inv_dev_entry(iommu, devid); |
| 2285 | iommu_completion_wait(iommu); |
| 2286 | } |
| 2287 | |
Joerg Roedel | 0110606 | 2008-12-02 19:34:11 +0100 | [diff] [blame] | 2288 | static int amd_iommu_attach_device(struct iommu_domain *dom, |
| 2289 | struct device *dev) |
| 2290 | { |
| 2291 | struct protection_domain *domain = dom->priv; |
| 2292 | struct protection_domain *old_domain; |
| 2293 | struct amd_iommu *iommu; |
| 2294 | struct pci_dev *pdev; |
| 2295 | u16 devid; |
| 2296 | |
| 2297 | if (dev->bus != &pci_bus_type) |
| 2298 | return -EINVAL; |
| 2299 | |
| 2300 | pdev = to_pci_dev(dev); |
| 2301 | |
| 2302 | devid = calc_devid(pdev->bus->number, pdev->devfn); |
| 2303 | |
| 2304 | if (devid >= amd_iommu_last_bdf || |
| 2305 | devid != amd_iommu_alias_table[devid]) |
| 2306 | return -EINVAL; |
| 2307 | |
| 2308 | iommu = amd_iommu_rlookup_table[devid]; |
| 2309 | if (!iommu) |
| 2310 | return -EINVAL; |
| 2311 | |
| 2312 | old_domain = domain_for_device(devid); |
| 2313 | if (old_domain) |
Joerg Roedel | 71ff3bc | 2009-06-08 13:47:33 -0700 | [diff] [blame] | 2314 | detach_device(old_domain, devid); |
Joerg Roedel | 0110606 | 2008-12-02 19:34:11 +0100 | [diff] [blame] | 2315 | |
| 2316 | attach_device(iommu, domain, devid); |
| 2317 | |
| 2318 | iommu_completion_wait(iommu); |
| 2319 | |
| 2320 | return 0; |
| 2321 | } |
| 2322 | |
Joerg Roedel | c6229ca | 2008-12-02 19:48:43 +0100 | [diff] [blame] | 2323 | static int amd_iommu_map_range(struct iommu_domain *dom, |
| 2324 | unsigned long iova, phys_addr_t paddr, |
| 2325 | size_t size, int iommu_prot) |
| 2326 | { |
| 2327 | struct protection_domain *domain = dom->priv; |
| 2328 | unsigned long i, npages = iommu_num_pages(paddr, size, PAGE_SIZE); |
| 2329 | int prot = 0; |
| 2330 | int ret; |
| 2331 | |
| 2332 | if (iommu_prot & IOMMU_READ) |
| 2333 | prot |= IOMMU_PROT_IR; |
| 2334 | if (iommu_prot & IOMMU_WRITE) |
| 2335 | prot |= IOMMU_PROT_IW; |
| 2336 | |
| 2337 | iova &= PAGE_MASK; |
| 2338 | paddr &= PAGE_MASK; |
| 2339 | |
| 2340 | for (i = 0; i < npages; ++i) { |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 2341 | ret = iommu_map_page(domain, iova, paddr, prot, PM_MAP_4k); |
Joerg Roedel | c6229ca | 2008-12-02 19:48:43 +0100 | [diff] [blame] | 2342 | if (ret) |
| 2343 | return ret; |
| 2344 | |
| 2345 | iova += PAGE_SIZE; |
| 2346 | paddr += PAGE_SIZE; |
| 2347 | } |
| 2348 | |
| 2349 | return 0; |
| 2350 | } |
| 2351 | |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 2352 | static void amd_iommu_unmap_range(struct iommu_domain *dom, |
| 2353 | unsigned long iova, size_t size) |
| 2354 | { |
| 2355 | |
| 2356 | struct protection_domain *domain = dom->priv; |
| 2357 | unsigned long i, npages = iommu_num_pages(iova, size, PAGE_SIZE); |
| 2358 | |
| 2359 | iova &= PAGE_MASK; |
| 2360 | |
| 2361 | for (i = 0; i < npages; ++i) { |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 2362 | iommu_unmap_page(domain, iova, PM_MAP_4k); |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 2363 | iova += PAGE_SIZE; |
| 2364 | } |
| 2365 | |
Joerg Roedel | 601367d | 2009-11-20 16:08:55 +0100 | [diff] [blame] | 2366 | iommu_flush_tlb_pde(domain); |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 2367 | } |
| 2368 | |
Joerg Roedel | 645c4c8 | 2008-12-02 20:05:50 +0100 | [diff] [blame] | 2369 | static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom, |
| 2370 | unsigned long iova) |
| 2371 | { |
| 2372 | struct protection_domain *domain = dom->priv; |
| 2373 | unsigned long offset = iova & ~PAGE_MASK; |
| 2374 | phys_addr_t paddr; |
| 2375 | u64 *pte; |
| 2376 | |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 2377 | pte = fetch_pte(domain, iova, PM_MAP_4k); |
Joerg Roedel | 645c4c8 | 2008-12-02 20:05:50 +0100 | [diff] [blame] | 2378 | |
Joerg Roedel | a6d41a4 | 2009-09-02 17:08:55 +0200 | [diff] [blame] | 2379 | if (!pte || !IOMMU_PTE_PRESENT(*pte)) |
Joerg Roedel | 645c4c8 | 2008-12-02 20:05:50 +0100 | [diff] [blame] | 2380 | return 0; |
| 2381 | |
| 2382 | paddr = *pte & IOMMU_PAGE_MASK; |
| 2383 | paddr |= offset; |
| 2384 | |
| 2385 | return paddr; |
| 2386 | } |
| 2387 | |
Sheng Yang | dbb9fd8 | 2009-03-18 15:33:06 +0800 | [diff] [blame] | 2388 | static int amd_iommu_domain_has_cap(struct iommu_domain *domain, |
| 2389 | unsigned long cap) |
| 2390 | { |
| 2391 | return 0; |
| 2392 | } |
| 2393 | |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 2394 | static struct iommu_ops amd_iommu_ops = { |
| 2395 | .domain_init = amd_iommu_domain_init, |
| 2396 | .domain_destroy = amd_iommu_domain_destroy, |
| 2397 | .attach_dev = amd_iommu_attach_device, |
| 2398 | .detach_dev = amd_iommu_detach_device, |
| 2399 | .map = amd_iommu_map_range, |
| 2400 | .unmap = amd_iommu_unmap_range, |
| 2401 | .iova_to_phys = amd_iommu_iova_to_phys, |
Sheng Yang | dbb9fd8 | 2009-03-18 15:33:06 +0800 | [diff] [blame] | 2402 | .domain_has_cap = amd_iommu_domain_has_cap, |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 2403 | }; |
| 2404 | |
Joerg Roedel | 0feae53 | 2009-08-26 15:26:30 +0200 | [diff] [blame] | 2405 | /***************************************************************************** |
| 2406 | * |
| 2407 | * The next functions do a basic initialization of IOMMU for pass through |
| 2408 | * mode |
| 2409 | * |
| 2410 | * In passthrough mode the IOMMU is initialized and enabled but not used for |
| 2411 | * DMA-API translation. |
| 2412 | * |
| 2413 | *****************************************************************************/ |
| 2414 | |
| 2415 | int __init amd_iommu_init_passthrough(void) |
| 2416 | { |
| 2417 | struct pci_dev *dev = NULL; |
| 2418 | u16 devid, devid2; |
| 2419 | |
| 2420 | /* allocate passthroug domain */ |
| 2421 | pt_domain = protection_domain_alloc(); |
| 2422 | if (!pt_domain) |
| 2423 | return -ENOMEM; |
| 2424 | |
| 2425 | pt_domain->mode |= PAGE_MODE_NONE; |
| 2426 | |
| 2427 | while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { |
| 2428 | struct amd_iommu *iommu; |
| 2429 | |
| 2430 | devid = calc_devid(dev->bus->number, dev->devfn); |
| 2431 | if (devid > amd_iommu_last_bdf) |
| 2432 | continue; |
| 2433 | |
| 2434 | devid2 = amd_iommu_alias_table[devid]; |
| 2435 | |
| 2436 | iommu = amd_iommu_rlookup_table[devid2]; |
| 2437 | if (!iommu) |
| 2438 | continue; |
| 2439 | |
| 2440 | __attach_device(iommu, pt_domain, devid); |
| 2441 | __attach_device(iommu, pt_domain, devid2); |
| 2442 | } |
| 2443 | |
| 2444 | pr_info("AMD-Vi: Initialized for Passthrough Mode\n"); |
| 2445 | |
| 2446 | return 0; |
| 2447 | } |