Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007-2008 Advanced Micro Devices, Inc. |
| 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 | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 31 | #include <asm/amd_iommu_types.h> |
Joerg Roedel | c6da992 | 2008-06-26 21:28:06 +0200 | [diff] [blame] | 32 | #include <asm/amd_iommu.h> |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 33 | |
| 34 | #define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28)) |
| 35 | |
Joerg Roedel | 136f78a | 2008-07-11 17:14:27 +0200 | [diff] [blame] | 36 | #define EXIT_LOOP_COUNT 10000000 |
| 37 | |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 38 | static DEFINE_RWLOCK(amd_iommu_devtable_lock); |
| 39 | |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 40 | /* A list of preallocated protection domains */ |
| 41 | static LIST_HEAD(iommu_pd_list); |
| 42 | static DEFINE_SPINLOCK(iommu_pd_list_lock); |
| 43 | |
Joerg Roedel | 0feae53 | 2009-08-26 15:26:30 +0200 | [diff] [blame^] | 44 | /* |
| 45 | * Domain for untranslated devices - only allocated |
| 46 | * if iommu=pt passed on kernel cmd line. |
| 47 | */ |
| 48 | static struct protection_domain *pt_domain; |
| 49 | |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 50 | #ifdef CONFIG_IOMMU_API |
| 51 | static struct iommu_ops amd_iommu_ops; |
| 52 | #endif |
| 53 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 54 | /* |
| 55 | * general struct to manage commands send to an IOMMU |
| 56 | */ |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 57 | struct iommu_cmd { |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 58 | u32 data[4]; |
| 59 | }; |
| 60 | |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 61 | static int dma_ops_unity_map(struct dma_ops_domain *dma_dom, |
| 62 | struct unity_map_entry *e); |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 63 | static struct dma_ops_domain *find_protection_domain(u16 devid); |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 64 | static u64* alloc_pte(struct protection_domain *dom, |
| 65 | unsigned long address, u64 |
| 66 | **pte_page, gfp_t gfp); |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 67 | static void dma_ops_reserve_addresses(struct dma_ops_domain *dom, |
| 68 | unsigned long start_page, |
| 69 | unsigned int pages); |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 70 | |
Chris Wright | c1eee67 | 2009-05-21 00:56:58 -0700 | [diff] [blame] | 71 | #ifndef BUS_NOTIFY_UNBOUND_DRIVER |
| 72 | #define BUS_NOTIFY_UNBOUND_DRIVER 0x0005 |
| 73 | #endif |
| 74 | |
Joerg Roedel | 7f26508 | 2008-12-12 13:50:21 +0100 | [diff] [blame] | 75 | #ifdef CONFIG_AMD_IOMMU_STATS |
| 76 | |
| 77 | /* |
| 78 | * Initialization code for statistics collection |
| 79 | */ |
| 80 | |
Joerg Roedel | da49f6d | 2008-12-12 14:59:58 +0100 | [diff] [blame] | 81 | DECLARE_STATS_COUNTER(compl_wait); |
Joerg Roedel | 0f2a86f | 2008-12-12 15:05:16 +0100 | [diff] [blame] | 82 | DECLARE_STATS_COUNTER(cnt_map_single); |
Joerg Roedel | 146a691 | 2008-12-12 15:07:12 +0100 | [diff] [blame] | 83 | DECLARE_STATS_COUNTER(cnt_unmap_single); |
Joerg Roedel | d03f067a | 2008-12-12 15:09:48 +0100 | [diff] [blame] | 84 | DECLARE_STATS_COUNTER(cnt_map_sg); |
Joerg Roedel | 55877a6 | 2008-12-12 15:12:14 +0100 | [diff] [blame] | 85 | DECLARE_STATS_COUNTER(cnt_unmap_sg); |
Joerg Roedel | c8f0fb3 | 2008-12-12 15:14:21 +0100 | [diff] [blame] | 86 | DECLARE_STATS_COUNTER(cnt_alloc_coherent); |
Joerg Roedel | 5d31ee7 | 2008-12-12 15:16:38 +0100 | [diff] [blame] | 87 | DECLARE_STATS_COUNTER(cnt_free_coherent); |
Joerg Roedel | c185897 | 2008-12-12 15:42:39 +0100 | [diff] [blame] | 88 | DECLARE_STATS_COUNTER(cross_page); |
Joerg Roedel | f57d98a | 2008-12-12 15:46:29 +0100 | [diff] [blame] | 89 | DECLARE_STATS_COUNTER(domain_flush_single); |
Joerg Roedel | 18811f5 | 2008-12-12 15:48:28 +0100 | [diff] [blame] | 90 | DECLARE_STATS_COUNTER(domain_flush_all); |
Joerg Roedel | 5774f7c | 2008-12-12 15:57:30 +0100 | [diff] [blame] | 91 | DECLARE_STATS_COUNTER(alloced_io_mem); |
Joerg Roedel | 8ecaf8f | 2008-12-12 16:13:04 +0100 | [diff] [blame] | 92 | DECLARE_STATS_COUNTER(total_map_requests); |
Joerg Roedel | da49f6d | 2008-12-12 14:59:58 +0100 | [diff] [blame] | 93 | |
Joerg Roedel | 7f26508 | 2008-12-12 13:50:21 +0100 | [diff] [blame] | 94 | static struct dentry *stats_dir; |
| 95 | static struct dentry *de_isolate; |
| 96 | static struct dentry *de_fflush; |
| 97 | |
| 98 | static void amd_iommu_stats_add(struct __iommu_counter *cnt) |
| 99 | { |
| 100 | if (stats_dir == NULL) |
| 101 | return; |
| 102 | |
| 103 | cnt->dent = debugfs_create_u64(cnt->name, 0444, stats_dir, |
| 104 | &cnt->value); |
| 105 | } |
| 106 | |
| 107 | static void amd_iommu_stats_init(void) |
| 108 | { |
| 109 | stats_dir = debugfs_create_dir("amd-iommu", NULL); |
| 110 | if (stats_dir == NULL) |
| 111 | return; |
| 112 | |
| 113 | de_isolate = debugfs_create_bool("isolation", 0444, stats_dir, |
| 114 | (u32 *)&amd_iommu_isolate); |
| 115 | |
| 116 | de_fflush = debugfs_create_bool("fullflush", 0444, stats_dir, |
| 117 | (u32 *)&amd_iommu_unmap_flush); |
Joerg Roedel | da49f6d | 2008-12-12 14:59:58 +0100 | [diff] [blame] | 118 | |
| 119 | amd_iommu_stats_add(&compl_wait); |
Joerg Roedel | 0f2a86f | 2008-12-12 15:05:16 +0100 | [diff] [blame] | 120 | amd_iommu_stats_add(&cnt_map_single); |
Joerg Roedel | 146a691 | 2008-12-12 15:07:12 +0100 | [diff] [blame] | 121 | amd_iommu_stats_add(&cnt_unmap_single); |
Joerg Roedel | d03f067a | 2008-12-12 15:09:48 +0100 | [diff] [blame] | 122 | amd_iommu_stats_add(&cnt_map_sg); |
Joerg Roedel | 55877a6 | 2008-12-12 15:12:14 +0100 | [diff] [blame] | 123 | amd_iommu_stats_add(&cnt_unmap_sg); |
Joerg Roedel | c8f0fb3 | 2008-12-12 15:14:21 +0100 | [diff] [blame] | 124 | amd_iommu_stats_add(&cnt_alloc_coherent); |
Joerg Roedel | 5d31ee7 | 2008-12-12 15:16:38 +0100 | [diff] [blame] | 125 | amd_iommu_stats_add(&cnt_free_coherent); |
Joerg Roedel | c185897 | 2008-12-12 15:42:39 +0100 | [diff] [blame] | 126 | amd_iommu_stats_add(&cross_page); |
Joerg Roedel | f57d98a | 2008-12-12 15:46:29 +0100 | [diff] [blame] | 127 | amd_iommu_stats_add(&domain_flush_single); |
Joerg Roedel | 18811f5 | 2008-12-12 15:48:28 +0100 | [diff] [blame] | 128 | amd_iommu_stats_add(&domain_flush_all); |
Joerg Roedel | 5774f7c | 2008-12-12 15:57:30 +0100 | [diff] [blame] | 129 | amd_iommu_stats_add(&alloced_io_mem); |
Joerg Roedel | 8ecaf8f | 2008-12-12 16:13:04 +0100 | [diff] [blame] | 130 | amd_iommu_stats_add(&total_map_requests); |
Joerg Roedel | 7f26508 | 2008-12-12 13:50:21 +0100 | [diff] [blame] | 131 | } |
| 132 | |
| 133 | #endif |
| 134 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 135 | /* returns !0 if the IOMMU is caching non-present entries in its TLB */ |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 136 | static int iommu_has_npcache(struct amd_iommu *iommu) |
| 137 | { |
Joerg Roedel | ae9b940 | 2008-10-30 17:43:57 +0100 | [diff] [blame] | 138 | return iommu->cap & (1UL << IOMMU_CAP_NPCACHE); |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 139 | } |
| 140 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 141 | /**************************************************************************** |
| 142 | * |
Joerg Roedel | a80dc3e | 2008-09-11 16:51:41 +0200 | [diff] [blame] | 143 | * Interrupt handling functions |
| 144 | * |
| 145 | ****************************************************************************/ |
| 146 | |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 147 | static void iommu_print_event(void *__evt) |
| 148 | { |
| 149 | u32 *event = __evt; |
| 150 | int type = (event[1] >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK; |
| 151 | int devid = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK; |
| 152 | int domid = (event[1] >> EVENT_DOMID_SHIFT) & EVENT_DOMID_MASK; |
| 153 | int flags = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK; |
| 154 | u64 address = (u64)(((u64)event[3]) << 32) | event[2]; |
| 155 | |
| 156 | printk(KERN_ERR "AMD IOMMU: Event logged ["); |
| 157 | |
| 158 | switch (type) { |
| 159 | case EVENT_TYPE_ILL_DEV: |
| 160 | printk("ILLEGAL_DEV_TABLE_ENTRY device=%02x:%02x.%x " |
| 161 | "address=0x%016llx flags=0x%04x]\n", |
| 162 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 163 | address, flags); |
| 164 | break; |
| 165 | case EVENT_TYPE_IO_FAULT: |
| 166 | printk("IO_PAGE_FAULT device=%02x:%02x.%x " |
| 167 | "domain=0x%04x address=0x%016llx flags=0x%04x]\n", |
| 168 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 169 | domid, address, flags); |
| 170 | break; |
| 171 | case EVENT_TYPE_DEV_TAB_ERR: |
| 172 | printk("DEV_TAB_HARDWARE_ERROR device=%02x:%02x.%x " |
| 173 | "address=0x%016llx flags=0x%04x]\n", |
| 174 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 175 | address, flags); |
| 176 | break; |
| 177 | case EVENT_TYPE_PAGE_TAB_ERR: |
| 178 | printk("PAGE_TAB_HARDWARE_ERROR 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_ILL_CMD: |
| 184 | printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address); |
| 185 | break; |
| 186 | case EVENT_TYPE_CMD_HARD_ERR: |
| 187 | printk("COMMAND_HARDWARE_ERROR address=0x%016llx " |
| 188 | "flags=0x%04x]\n", address, flags); |
| 189 | break; |
| 190 | case EVENT_TYPE_IOTLB_INV_TO: |
| 191 | printk("IOTLB_INV_TIMEOUT device=%02x:%02x.%x " |
| 192 | "address=0x%016llx]\n", |
| 193 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 194 | address); |
| 195 | break; |
| 196 | case EVENT_TYPE_INV_DEV_REQ: |
| 197 | printk("INVALID_DEVICE_REQUEST device=%02x:%02x.%x " |
| 198 | "address=0x%016llx flags=0x%04x]\n", |
| 199 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 200 | address, flags); |
| 201 | break; |
| 202 | default: |
| 203 | printk(KERN_ERR "UNKNOWN type=0x%02x]\n", type); |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | static void iommu_poll_events(struct amd_iommu *iommu) |
| 208 | { |
| 209 | u32 head, tail; |
| 210 | unsigned long flags; |
| 211 | |
| 212 | spin_lock_irqsave(&iommu->lock, flags); |
| 213 | |
| 214 | head = readl(iommu->mmio_base + MMIO_EVT_HEAD_OFFSET); |
| 215 | tail = readl(iommu->mmio_base + MMIO_EVT_TAIL_OFFSET); |
| 216 | |
| 217 | while (head != tail) { |
| 218 | iommu_print_event(iommu->evt_buf + head); |
| 219 | head = (head + EVENT_ENTRY_SIZE) % iommu->evt_buf_size; |
| 220 | } |
| 221 | |
| 222 | writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET); |
| 223 | |
| 224 | spin_unlock_irqrestore(&iommu->lock, flags); |
| 225 | } |
| 226 | |
Joerg Roedel | a80dc3e | 2008-09-11 16:51:41 +0200 | [diff] [blame] | 227 | irqreturn_t amd_iommu_int_handler(int irq, void *data) |
| 228 | { |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 229 | struct amd_iommu *iommu; |
| 230 | |
Joerg Roedel | 3bd2217 | 2009-05-04 15:06:20 +0200 | [diff] [blame] | 231 | for_each_iommu(iommu) |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 232 | iommu_poll_events(iommu); |
| 233 | |
| 234 | return IRQ_HANDLED; |
Joerg Roedel | a80dc3e | 2008-09-11 16:51:41 +0200 | [diff] [blame] | 235 | } |
| 236 | |
| 237 | /**************************************************************************** |
| 238 | * |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 239 | * IOMMU command queuing functions |
| 240 | * |
| 241 | ****************************************************************************/ |
| 242 | |
| 243 | /* |
| 244 | * Writes the command to the IOMMUs command buffer and informs the |
| 245 | * hardware about the new command. Must be called with iommu->lock held. |
| 246 | */ |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 247 | 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] | 248 | { |
| 249 | u32 tail, head; |
| 250 | u8 *target; |
| 251 | |
| 252 | tail = readl(iommu->mmio_base + MMIO_CMD_TAIL_OFFSET); |
Jiri Kosina | 8a7c5ef | 2008-08-19 02:13:55 +0200 | [diff] [blame] | 253 | target = iommu->cmd_buf + tail; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 254 | memcpy_toio(target, cmd, sizeof(*cmd)); |
| 255 | tail = (tail + sizeof(*cmd)) % iommu->cmd_buf_size; |
| 256 | head = readl(iommu->mmio_base + MMIO_CMD_HEAD_OFFSET); |
| 257 | if (tail == head) |
| 258 | return -ENOMEM; |
| 259 | writel(tail, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET); |
| 260 | |
| 261 | return 0; |
| 262 | } |
| 263 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 264 | /* |
| 265 | * General queuing function for commands. Takes iommu->lock and calls |
| 266 | * __iommu_queue_command(). |
| 267 | */ |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 268 | 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] | 269 | { |
| 270 | unsigned long flags; |
| 271 | int ret; |
| 272 | |
| 273 | spin_lock_irqsave(&iommu->lock, flags); |
| 274 | ret = __iommu_queue_command(iommu, cmd); |
Joerg Roedel | 09ee17e | 2008-12-03 12:19:27 +0100 | [diff] [blame] | 275 | if (!ret) |
Joerg Roedel | 0cfd7aa | 2008-12-10 19:58:00 +0100 | [diff] [blame] | 276 | iommu->need_sync = true; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 277 | spin_unlock_irqrestore(&iommu->lock, flags); |
| 278 | |
| 279 | return ret; |
| 280 | } |
| 281 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 282 | /* |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 283 | * This function waits until an IOMMU has completed a completion |
| 284 | * wait command |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 285 | */ |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 286 | static void __iommu_wait_for_completion(struct amd_iommu *iommu) |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 287 | { |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 288 | int ready = 0; |
Joerg Roedel | 519c31b | 2008-08-14 19:55:15 +0200 | [diff] [blame] | 289 | unsigned status = 0; |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 290 | unsigned long i = 0; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 291 | |
Joerg Roedel | da49f6d | 2008-12-12 14:59:58 +0100 | [diff] [blame] | 292 | INC_STATS_COUNTER(compl_wait); |
| 293 | |
Joerg Roedel | 136f78a | 2008-07-11 17:14:27 +0200 | [diff] [blame] | 294 | while (!ready && (i < EXIT_LOOP_COUNT)) { |
| 295 | ++i; |
Joerg Roedel | 519c31b | 2008-08-14 19:55:15 +0200 | [diff] [blame] | 296 | /* wait for the bit to become one */ |
| 297 | status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET); |
| 298 | ready = status & MMIO_STATUS_COM_WAIT_INT_MASK; |
Joerg Roedel | 136f78a | 2008-07-11 17:14:27 +0200 | [diff] [blame] | 299 | } |
| 300 | |
Joerg Roedel | 519c31b | 2008-08-14 19:55:15 +0200 | [diff] [blame] | 301 | /* set bit back to zero */ |
| 302 | status &= ~MMIO_STATUS_COM_WAIT_INT_MASK; |
| 303 | writel(status, iommu->mmio_base + MMIO_STATUS_OFFSET); |
| 304 | |
Joerg Roedel | 84df817 | 2008-12-17 16:36:44 +0100 | [diff] [blame] | 305 | if (unlikely(i == EXIT_LOOP_COUNT)) |
| 306 | panic("AMD IOMMU: Completion wait loop failed\n"); |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 307 | } |
| 308 | |
| 309 | /* |
| 310 | * This function queues a completion wait command into the command |
| 311 | * buffer of an IOMMU |
| 312 | */ |
| 313 | static int __iommu_completion_wait(struct amd_iommu *iommu) |
| 314 | { |
| 315 | struct iommu_cmd cmd; |
| 316 | |
| 317 | memset(&cmd, 0, sizeof(cmd)); |
| 318 | cmd.data[0] = CMD_COMPL_WAIT_INT_MASK; |
| 319 | CMD_SET_TYPE(&cmd, CMD_COMPL_WAIT); |
| 320 | |
| 321 | return __iommu_queue_command(iommu, &cmd); |
| 322 | } |
| 323 | |
| 324 | /* |
| 325 | * This function is called whenever we need to ensure that the IOMMU has |
| 326 | * completed execution of all commands we sent. It sends a |
| 327 | * COMPLETION_WAIT command and waits for it to finish. The IOMMU informs |
| 328 | * us about that by writing a value to a physical address we pass with |
| 329 | * the command. |
| 330 | */ |
| 331 | static int iommu_completion_wait(struct amd_iommu *iommu) |
| 332 | { |
| 333 | int ret = 0; |
| 334 | unsigned long flags; |
| 335 | |
| 336 | spin_lock_irqsave(&iommu->lock, flags); |
| 337 | |
| 338 | if (!iommu->need_sync) |
| 339 | goto out; |
| 340 | |
| 341 | ret = __iommu_completion_wait(iommu); |
| 342 | |
Joerg Roedel | 0cfd7aa | 2008-12-10 19:58:00 +0100 | [diff] [blame] | 343 | iommu->need_sync = false; |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 344 | |
| 345 | if (ret) |
| 346 | goto out; |
| 347 | |
| 348 | __iommu_wait_for_completion(iommu); |
Joerg Roedel | 84df817 | 2008-12-17 16:36:44 +0100 | [diff] [blame] | 349 | |
Joerg Roedel | 7e4f88d | 2008-09-17 14:19:15 +0200 | [diff] [blame] | 350 | out: |
| 351 | spin_unlock_irqrestore(&iommu->lock, flags); |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 352 | |
| 353 | return 0; |
| 354 | } |
| 355 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 356 | /* |
| 357 | * Command send function for invalidating a device table entry |
| 358 | */ |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 359 | static int iommu_queue_inv_dev_entry(struct amd_iommu *iommu, u16 devid) |
| 360 | { |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 361 | struct iommu_cmd cmd; |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 362 | int ret; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 363 | |
| 364 | BUG_ON(iommu == NULL); |
| 365 | |
| 366 | memset(&cmd, 0, sizeof(cmd)); |
| 367 | CMD_SET_TYPE(&cmd, CMD_INV_DEV_ENTRY); |
| 368 | cmd.data[0] = devid; |
| 369 | |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 370 | ret = iommu_queue_command(iommu, &cmd); |
| 371 | |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 372 | return ret; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 373 | } |
| 374 | |
Joerg Roedel | 237b6f3 | 2008-12-02 20:54:37 +0100 | [diff] [blame] | 375 | static void __iommu_build_inv_iommu_pages(struct iommu_cmd *cmd, u64 address, |
| 376 | u16 domid, int pde, int s) |
| 377 | { |
| 378 | memset(cmd, 0, sizeof(*cmd)); |
| 379 | address &= PAGE_MASK; |
| 380 | CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES); |
| 381 | cmd->data[1] |= domid; |
| 382 | cmd->data[2] = lower_32_bits(address); |
| 383 | cmd->data[3] = upper_32_bits(address); |
| 384 | if (s) /* size bit - we flush more than one 4kb page */ |
| 385 | cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK; |
| 386 | if (pde) /* PDE bit - we wan't flush everything not only the PTEs */ |
| 387 | cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK; |
| 388 | } |
| 389 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 390 | /* |
| 391 | * Generic command send function for invalidaing TLB entries |
| 392 | */ |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 393 | static int iommu_queue_inv_iommu_pages(struct amd_iommu *iommu, |
| 394 | u64 address, u16 domid, int pde, int s) |
| 395 | { |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 396 | struct iommu_cmd cmd; |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 397 | int ret; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 398 | |
Joerg Roedel | 237b6f3 | 2008-12-02 20:54:37 +0100 | [diff] [blame] | 399 | __iommu_build_inv_iommu_pages(&cmd, address, domid, pde, s); |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 400 | |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 401 | ret = iommu_queue_command(iommu, &cmd); |
| 402 | |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 403 | return ret; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 404 | } |
| 405 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 406 | /* |
| 407 | * TLB invalidation function which is called from the mapping functions. |
| 408 | * It invalidates a single PTE if the range to flush is within a single |
| 409 | * page. Otherwise it flushes the whole TLB of the IOMMU. |
| 410 | */ |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 411 | static int iommu_flush_pages(struct amd_iommu *iommu, u16 domid, |
| 412 | u64 address, size_t size) |
| 413 | { |
Joerg Roedel | 999ba41 | 2008-07-03 19:35:08 +0200 | [diff] [blame] | 414 | int s = 0; |
Joerg Roedel | e3c449f | 2008-10-15 22:02:11 -0700 | [diff] [blame] | 415 | unsigned pages = iommu_num_pages(address, size, PAGE_SIZE); |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 416 | |
| 417 | address &= PAGE_MASK; |
| 418 | |
Joerg Roedel | 999ba41 | 2008-07-03 19:35:08 +0200 | [diff] [blame] | 419 | if (pages > 1) { |
| 420 | /* |
| 421 | * If we have to flush more than one page, flush all |
| 422 | * TLB entries for this domain |
| 423 | */ |
| 424 | address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS; |
| 425 | s = 1; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 426 | } |
| 427 | |
Joerg Roedel | 999ba41 | 2008-07-03 19:35:08 +0200 | [diff] [blame] | 428 | iommu_queue_inv_iommu_pages(iommu, address, domid, 0, s); |
| 429 | |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 430 | return 0; |
| 431 | } |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 432 | |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 433 | /* Flush the whole IO/TLB for a given protection domain */ |
| 434 | static void iommu_flush_tlb(struct amd_iommu *iommu, u16 domid) |
| 435 | { |
| 436 | u64 address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS; |
| 437 | |
Joerg Roedel | f57d98a | 2008-12-12 15:46:29 +0100 | [diff] [blame] | 438 | INC_STATS_COUNTER(domain_flush_single); |
| 439 | |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 440 | iommu_queue_inv_iommu_pages(iommu, address, domid, 0, 1); |
| 441 | } |
| 442 | |
Chris Wright | 42a49f9 | 2009-06-15 15:42:00 +0200 | [diff] [blame] | 443 | /* Flush the whole IO/TLB for a given protection domain - including PDE */ |
| 444 | static void iommu_flush_tlb_pde(struct amd_iommu *iommu, u16 domid) |
| 445 | { |
| 446 | u64 address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS; |
| 447 | |
| 448 | INC_STATS_COUNTER(domain_flush_single); |
| 449 | |
| 450 | iommu_queue_inv_iommu_pages(iommu, address, domid, 1, 1); |
| 451 | } |
| 452 | |
Joerg Roedel | 43f4960 | 2008-12-02 21:01:12 +0100 | [diff] [blame] | 453 | /* |
| 454 | * This function is used to flush the IO/TLB for a given protection domain |
| 455 | * on every IOMMU in the system |
| 456 | */ |
| 457 | static void iommu_flush_domain(u16 domid) |
| 458 | { |
| 459 | unsigned long flags; |
| 460 | struct amd_iommu *iommu; |
| 461 | struct iommu_cmd cmd; |
| 462 | |
Joerg Roedel | 18811f5 | 2008-12-12 15:48:28 +0100 | [diff] [blame] | 463 | INC_STATS_COUNTER(domain_flush_all); |
| 464 | |
Joerg Roedel | 43f4960 | 2008-12-02 21:01:12 +0100 | [diff] [blame] | 465 | __iommu_build_inv_iommu_pages(&cmd, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, |
| 466 | domid, 1, 1); |
| 467 | |
Joerg Roedel | 3bd2217 | 2009-05-04 15:06:20 +0200 | [diff] [blame] | 468 | for_each_iommu(iommu) { |
Joerg Roedel | 43f4960 | 2008-12-02 21:01:12 +0100 | [diff] [blame] | 469 | spin_lock_irqsave(&iommu->lock, flags); |
| 470 | __iommu_queue_command(iommu, &cmd); |
| 471 | __iommu_completion_wait(iommu); |
| 472 | __iommu_wait_for_completion(iommu); |
| 473 | spin_unlock_irqrestore(&iommu->lock, flags); |
| 474 | } |
| 475 | } |
Joerg Roedel | 43f4960 | 2008-12-02 21:01:12 +0100 | [diff] [blame] | 476 | |
Joerg Roedel | bfd1be1 | 2009-05-05 15:33:57 +0200 | [diff] [blame] | 477 | void amd_iommu_flush_all_domains(void) |
| 478 | { |
| 479 | int i; |
| 480 | |
| 481 | for (i = 1; i < MAX_DOMAIN_ID; ++i) { |
| 482 | if (!test_bit(i, amd_iommu_pd_alloc_bitmap)) |
| 483 | continue; |
| 484 | iommu_flush_domain(i); |
| 485 | } |
| 486 | } |
| 487 | |
Joerg Roedel | 7d7a110 | 2009-05-05 15:48:10 +0200 | [diff] [blame] | 488 | void amd_iommu_flush_all_devices(void) |
| 489 | { |
| 490 | struct amd_iommu *iommu; |
| 491 | int i; |
| 492 | |
| 493 | for (i = 0; i <= amd_iommu_last_bdf; ++i) { |
| 494 | if (amd_iommu_pd_table[i] == NULL) |
| 495 | continue; |
| 496 | |
| 497 | iommu = amd_iommu_rlookup_table[i]; |
| 498 | if (!iommu) |
| 499 | continue; |
| 500 | |
| 501 | iommu_queue_inv_dev_entry(iommu, i); |
| 502 | iommu_completion_wait(iommu); |
| 503 | } |
| 504 | } |
| 505 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 506 | /**************************************************************************** |
| 507 | * |
| 508 | * The functions below are used the create the page table mappings for |
| 509 | * unity mapped regions. |
| 510 | * |
| 511 | ****************************************************************************/ |
| 512 | |
| 513 | /* |
| 514 | * Generic mapping functions. It maps a physical address into a DMA |
| 515 | * address space. It allocates the page table pages if necessary. |
| 516 | * In the future it can be extended to a generic mapping function |
| 517 | * supporting all features of AMD IOMMU page tables like level skipping |
| 518 | * and full 64 bit address spaces. |
| 519 | */ |
Joerg Roedel | 38e817f | 2008-12-02 17:27:52 +0100 | [diff] [blame] | 520 | static int iommu_map_page(struct protection_domain *dom, |
| 521 | unsigned long bus_addr, |
| 522 | unsigned long phys_addr, |
| 523 | int prot) |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 524 | { |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 525 | u64 __pte, *pte; |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 526 | |
| 527 | bus_addr = PAGE_ALIGN(bus_addr); |
Joerg Roedel | bb9d4ff | 2008-12-04 15:59:48 +0100 | [diff] [blame] | 528 | phys_addr = PAGE_ALIGN(phys_addr); |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 529 | |
| 530 | /* only support 512GB address spaces for now */ |
| 531 | if (bus_addr > IOMMU_MAP_SIZE_L3 || !(prot & IOMMU_PROT_MASK)) |
| 532 | return -EINVAL; |
| 533 | |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 534 | pte = alloc_pte(dom, bus_addr, NULL, GFP_KERNEL); |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 535 | |
| 536 | if (IOMMU_PTE_PRESENT(*pte)) |
| 537 | return -EBUSY; |
| 538 | |
| 539 | __pte = phys_addr | IOMMU_PTE_P; |
| 540 | if (prot & IOMMU_PROT_IR) |
| 541 | __pte |= IOMMU_PTE_IR; |
| 542 | if (prot & IOMMU_PROT_IW) |
| 543 | __pte |= IOMMU_PTE_IW; |
| 544 | |
| 545 | *pte = __pte; |
| 546 | |
| 547 | return 0; |
| 548 | } |
| 549 | |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 550 | static void iommu_unmap_page(struct protection_domain *dom, |
| 551 | unsigned long bus_addr) |
| 552 | { |
| 553 | u64 *pte; |
| 554 | |
| 555 | pte = &dom->pt_root[IOMMU_PTE_L2_INDEX(bus_addr)]; |
| 556 | |
| 557 | if (!IOMMU_PTE_PRESENT(*pte)) |
| 558 | return; |
| 559 | |
| 560 | pte = IOMMU_PTE_PAGE(*pte); |
| 561 | pte = &pte[IOMMU_PTE_L1_INDEX(bus_addr)]; |
| 562 | |
| 563 | if (!IOMMU_PTE_PRESENT(*pte)) |
| 564 | return; |
| 565 | |
| 566 | pte = IOMMU_PTE_PAGE(*pte); |
| 567 | pte = &pte[IOMMU_PTE_L1_INDEX(bus_addr)]; |
| 568 | |
| 569 | *pte = 0; |
| 570 | } |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 571 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 572 | /* |
| 573 | * This function checks if a specific unity mapping entry is needed for |
| 574 | * this specific IOMMU. |
| 575 | */ |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 576 | static int iommu_for_unity_map(struct amd_iommu *iommu, |
| 577 | struct unity_map_entry *entry) |
| 578 | { |
| 579 | u16 bdf, i; |
| 580 | |
| 581 | for (i = entry->devid_start; i <= entry->devid_end; ++i) { |
| 582 | bdf = amd_iommu_alias_table[i]; |
| 583 | if (amd_iommu_rlookup_table[bdf] == iommu) |
| 584 | return 1; |
| 585 | } |
| 586 | |
| 587 | return 0; |
| 588 | } |
| 589 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 590 | /* |
| 591 | * Init the unity mappings for a specific IOMMU in the system |
| 592 | * |
| 593 | * Basically iterates over all unity mapping entries and applies them to |
| 594 | * the default domain DMA of that IOMMU if necessary. |
| 595 | */ |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 596 | static int iommu_init_unity_mappings(struct amd_iommu *iommu) |
| 597 | { |
| 598 | struct unity_map_entry *entry; |
| 599 | int ret; |
| 600 | |
| 601 | list_for_each_entry(entry, &amd_iommu_unity_map, list) { |
| 602 | if (!iommu_for_unity_map(iommu, entry)) |
| 603 | continue; |
| 604 | ret = dma_ops_unity_map(iommu->default_dom, entry); |
| 605 | if (ret) |
| 606 | return ret; |
| 607 | } |
| 608 | |
| 609 | return 0; |
| 610 | } |
| 611 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 612 | /* |
| 613 | * This function actually applies the mapping to the page table of the |
| 614 | * dma_ops domain. |
| 615 | */ |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 616 | static int dma_ops_unity_map(struct dma_ops_domain *dma_dom, |
| 617 | struct unity_map_entry *e) |
| 618 | { |
| 619 | u64 addr; |
| 620 | int ret; |
| 621 | |
| 622 | for (addr = e->address_start; addr < e->address_end; |
| 623 | addr += PAGE_SIZE) { |
Joerg Roedel | 38e817f | 2008-12-02 17:27:52 +0100 | [diff] [blame] | 624 | ret = iommu_map_page(&dma_dom->domain, addr, addr, e->prot); |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 625 | if (ret) |
| 626 | return ret; |
| 627 | /* |
| 628 | * if unity mapping is in aperture range mark the page |
| 629 | * as allocated in the aperture |
| 630 | */ |
| 631 | if (addr < dma_dom->aperture_size) |
Joerg Roedel | c323956 | 2009-05-12 10:56:44 +0200 | [diff] [blame] | 632 | __set_bit(addr >> PAGE_SHIFT, |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 633 | dma_dom->aperture[0]->bitmap); |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 634 | } |
| 635 | |
| 636 | return 0; |
| 637 | } |
| 638 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 639 | /* |
| 640 | * Inits the unity mappings required for a specific device |
| 641 | */ |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 642 | static int init_unity_mappings_for_device(struct dma_ops_domain *dma_dom, |
| 643 | u16 devid) |
| 644 | { |
| 645 | struct unity_map_entry *e; |
| 646 | int ret; |
| 647 | |
| 648 | list_for_each_entry(e, &amd_iommu_unity_map, list) { |
| 649 | if (!(devid >= e->devid_start && devid <= e->devid_end)) |
| 650 | continue; |
| 651 | ret = dma_ops_unity_map(dma_dom, e); |
| 652 | if (ret) |
| 653 | return ret; |
| 654 | } |
| 655 | |
| 656 | return 0; |
| 657 | } |
| 658 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 659 | /**************************************************************************** |
| 660 | * |
| 661 | * The next functions belong to the address allocator for the dma_ops |
| 662 | * interface functions. They work like the allocators in the other IOMMU |
| 663 | * drivers. Its basically a bitmap which marks the allocated pages in |
| 664 | * the aperture. Maybe it could be enhanced in the future to a more |
| 665 | * efficient allocator. |
| 666 | * |
| 667 | ****************************************************************************/ |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 668 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 669 | /* |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 670 | * The address allocator core functions. |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 671 | * |
| 672 | * called with domain->lock held |
| 673 | */ |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 674 | |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 675 | /* |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 676 | * This function checks if there is a PTE for a given dma address. If |
| 677 | * there is one, it returns the pointer to it. |
| 678 | */ |
| 679 | static u64* fetch_pte(struct protection_domain *domain, |
| 680 | unsigned long address) |
| 681 | { |
| 682 | u64 *pte; |
| 683 | |
| 684 | pte = &domain->pt_root[IOMMU_PTE_L2_INDEX(address)]; |
| 685 | |
| 686 | if (!IOMMU_PTE_PRESENT(*pte)) |
| 687 | return NULL; |
| 688 | |
| 689 | pte = IOMMU_PTE_PAGE(*pte); |
| 690 | pte = &pte[IOMMU_PTE_L1_INDEX(address)]; |
| 691 | |
| 692 | if (!IOMMU_PTE_PRESENT(*pte)) |
| 693 | return NULL; |
| 694 | |
| 695 | pte = IOMMU_PTE_PAGE(*pte); |
| 696 | pte = &pte[IOMMU_PTE_L0_INDEX(address)]; |
| 697 | |
| 698 | return pte; |
| 699 | } |
| 700 | |
| 701 | /* |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 702 | * This function is used to add a new aperture range to an existing |
| 703 | * aperture in case of dma_ops domain allocation or address allocation |
| 704 | * failure. |
| 705 | */ |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 706 | static int alloc_new_range(struct amd_iommu *iommu, |
| 707 | struct dma_ops_domain *dma_dom, |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 708 | bool populate, gfp_t gfp) |
| 709 | { |
| 710 | int index = dma_dom->aperture_size >> APERTURE_RANGE_SHIFT; |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 711 | int i; |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 712 | |
Joerg Roedel | f5e9705 | 2009-05-22 12:31:53 +0200 | [diff] [blame] | 713 | #ifdef CONFIG_IOMMU_STRESS |
| 714 | populate = false; |
| 715 | #endif |
| 716 | |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 717 | if (index >= APERTURE_MAX_RANGES) |
| 718 | return -ENOMEM; |
| 719 | |
| 720 | dma_dom->aperture[index] = kzalloc(sizeof(struct aperture_range), gfp); |
| 721 | if (!dma_dom->aperture[index]) |
| 722 | return -ENOMEM; |
| 723 | |
| 724 | dma_dom->aperture[index]->bitmap = (void *)get_zeroed_page(gfp); |
| 725 | if (!dma_dom->aperture[index]->bitmap) |
| 726 | goto out_free; |
| 727 | |
| 728 | dma_dom->aperture[index]->offset = dma_dom->aperture_size; |
| 729 | |
| 730 | if (populate) { |
| 731 | unsigned long address = dma_dom->aperture_size; |
| 732 | int i, num_ptes = APERTURE_RANGE_PAGES / 512; |
| 733 | u64 *pte, *pte_page; |
| 734 | |
| 735 | for (i = 0; i < num_ptes; ++i) { |
| 736 | pte = alloc_pte(&dma_dom->domain, address, |
| 737 | &pte_page, gfp); |
| 738 | if (!pte) |
| 739 | goto out_free; |
| 740 | |
| 741 | dma_dom->aperture[index]->pte_pages[i] = pte_page; |
| 742 | |
| 743 | address += APERTURE_RANGE_SIZE / 64; |
| 744 | } |
| 745 | } |
| 746 | |
| 747 | dma_dom->aperture_size += APERTURE_RANGE_SIZE; |
| 748 | |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 749 | /* Intialize the exclusion range if necessary */ |
| 750 | if (iommu->exclusion_start && |
| 751 | iommu->exclusion_start >= dma_dom->aperture[index]->offset && |
| 752 | iommu->exclusion_start < dma_dom->aperture_size) { |
| 753 | unsigned long startpage = iommu->exclusion_start >> PAGE_SHIFT; |
| 754 | int pages = iommu_num_pages(iommu->exclusion_start, |
| 755 | iommu->exclusion_length, |
| 756 | PAGE_SIZE); |
| 757 | dma_ops_reserve_addresses(dma_dom, startpage, pages); |
| 758 | } |
| 759 | |
| 760 | /* |
| 761 | * Check for areas already mapped as present in the new aperture |
| 762 | * range and mark those pages as reserved in the allocator. Such |
| 763 | * mappings may already exist as a result of requested unity |
| 764 | * mappings for devices. |
| 765 | */ |
| 766 | for (i = dma_dom->aperture[index]->offset; |
| 767 | i < dma_dom->aperture_size; |
| 768 | i += PAGE_SIZE) { |
| 769 | u64 *pte = fetch_pte(&dma_dom->domain, i); |
| 770 | if (!pte || !IOMMU_PTE_PRESENT(*pte)) |
| 771 | continue; |
| 772 | |
| 773 | dma_ops_reserve_addresses(dma_dom, i << PAGE_SHIFT, 1); |
| 774 | } |
| 775 | |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 776 | return 0; |
| 777 | |
| 778 | out_free: |
| 779 | free_page((unsigned long)dma_dom->aperture[index]->bitmap); |
| 780 | |
| 781 | kfree(dma_dom->aperture[index]); |
| 782 | dma_dom->aperture[index] = NULL; |
| 783 | |
| 784 | return -ENOMEM; |
| 785 | } |
| 786 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 787 | static unsigned long dma_ops_area_alloc(struct device *dev, |
| 788 | struct dma_ops_domain *dom, |
| 789 | unsigned int pages, |
| 790 | unsigned long align_mask, |
| 791 | u64 dma_mask, |
| 792 | unsigned long start) |
| 793 | { |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 794 | unsigned long next_bit = dom->next_address % APERTURE_RANGE_SIZE; |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 795 | int max_index = dom->aperture_size >> APERTURE_RANGE_SHIFT; |
| 796 | int i = start >> APERTURE_RANGE_SHIFT; |
| 797 | unsigned long boundary_size; |
| 798 | unsigned long address = -1; |
| 799 | unsigned long limit; |
| 800 | |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 801 | next_bit >>= PAGE_SHIFT; |
| 802 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 803 | boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1, |
| 804 | PAGE_SIZE) >> PAGE_SHIFT; |
| 805 | |
| 806 | for (;i < max_index; ++i) { |
| 807 | unsigned long offset = dom->aperture[i]->offset >> PAGE_SHIFT; |
| 808 | |
| 809 | if (dom->aperture[i]->offset >= dma_mask) |
| 810 | break; |
| 811 | |
| 812 | limit = iommu_device_max_index(APERTURE_RANGE_PAGES, offset, |
| 813 | dma_mask >> PAGE_SHIFT); |
| 814 | |
| 815 | address = iommu_area_alloc(dom->aperture[i]->bitmap, |
| 816 | limit, next_bit, pages, 0, |
| 817 | boundary_size, align_mask); |
| 818 | if (address != -1) { |
| 819 | address = dom->aperture[i]->offset + |
| 820 | (address << PAGE_SHIFT); |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 821 | dom->next_address = address + (pages << PAGE_SHIFT); |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 822 | break; |
| 823 | } |
| 824 | |
| 825 | next_bit = 0; |
| 826 | } |
| 827 | |
| 828 | return address; |
| 829 | } |
| 830 | |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 831 | static unsigned long dma_ops_alloc_addresses(struct device *dev, |
| 832 | struct dma_ops_domain *dom, |
Joerg Roedel | 6d4f343 | 2008-09-04 19:18:02 +0200 | [diff] [blame] | 833 | unsigned int pages, |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 834 | unsigned long align_mask, |
| 835 | u64 dma_mask) |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 836 | { |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 837 | unsigned long address; |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 838 | |
Joerg Roedel | fe16f08 | 2009-05-22 12:27:53 +0200 | [diff] [blame] | 839 | #ifdef CONFIG_IOMMU_STRESS |
| 840 | dom->next_address = 0; |
| 841 | dom->need_flush = true; |
| 842 | #endif |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 843 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 844 | address = dma_ops_area_alloc(dev, dom, pages, align_mask, |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 845 | dma_mask, dom->next_address); |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 846 | |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 847 | if (address == -1) { |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 848 | dom->next_address = 0; |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 849 | address = dma_ops_area_alloc(dev, dom, pages, align_mask, |
| 850 | dma_mask, 0); |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 851 | dom->need_flush = true; |
| 852 | } |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 853 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 854 | if (unlikely(address == -1)) |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 855 | address = bad_dma_address; |
| 856 | |
| 857 | WARN_ON((address + (PAGE_SIZE*pages)) > dom->aperture_size); |
| 858 | |
| 859 | return address; |
| 860 | } |
| 861 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 862 | /* |
| 863 | * The address free function. |
| 864 | * |
| 865 | * called with domain->lock held |
| 866 | */ |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 867 | static void dma_ops_free_addresses(struct dma_ops_domain *dom, |
| 868 | unsigned long address, |
| 869 | unsigned int pages) |
| 870 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 871 | unsigned i = address >> APERTURE_RANGE_SHIFT; |
| 872 | struct aperture_range *range = dom->aperture[i]; |
Joerg Roedel | 80be308 | 2008-11-06 14:59:05 +0100 | [diff] [blame] | 873 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 874 | BUG_ON(i >= APERTURE_MAX_RANGES || range == NULL); |
| 875 | |
Joerg Roedel | 47bccd6 | 2009-05-22 12:40:54 +0200 | [diff] [blame] | 876 | #ifdef CONFIG_IOMMU_STRESS |
| 877 | if (i < 4) |
| 878 | return; |
| 879 | #endif |
| 880 | |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 881 | if (address >= dom->next_address) |
Joerg Roedel | 80be308 | 2008-11-06 14:59:05 +0100 | [diff] [blame] | 882 | dom->need_flush = true; |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 883 | |
| 884 | address = (address % APERTURE_RANGE_SIZE) >> PAGE_SHIFT; |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 885 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 886 | iommu_area_free(range->bitmap, address, pages); |
| 887 | |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 888 | } |
| 889 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 890 | /**************************************************************************** |
| 891 | * |
| 892 | * The next functions belong to the domain allocation. A domain is |
| 893 | * allocated for every IOMMU as the default domain. If device isolation |
| 894 | * is enabled, every device get its own domain. The most important thing |
| 895 | * about domains is the page table mapping the DMA address space they |
| 896 | * contain. |
| 897 | * |
| 898 | ****************************************************************************/ |
| 899 | |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 900 | static u16 domain_id_alloc(void) |
| 901 | { |
| 902 | unsigned long flags; |
| 903 | int id; |
| 904 | |
| 905 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 906 | id = find_first_zero_bit(amd_iommu_pd_alloc_bitmap, MAX_DOMAIN_ID); |
| 907 | BUG_ON(id == 0); |
| 908 | if (id > 0 && id < MAX_DOMAIN_ID) |
| 909 | __set_bit(id, amd_iommu_pd_alloc_bitmap); |
| 910 | else |
| 911 | id = 0; |
| 912 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 913 | |
| 914 | return id; |
| 915 | } |
| 916 | |
Joerg Roedel | a2acfb7 | 2008-12-02 18:28:53 +0100 | [diff] [blame] | 917 | static void domain_id_free(int id) |
| 918 | { |
| 919 | unsigned long flags; |
| 920 | |
| 921 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 922 | if (id > 0 && id < MAX_DOMAIN_ID) |
| 923 | __clear_bit(id, amd_iommu_pd_alloc_bitmap); |
| 924 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 925 | } |
Joerg Roedel | a2acfb7 | 2008-12-02 18:28:53 +0100 | [diff] [blame] | 926 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 927 | /* |
| 928 | * Used to reserve address ranges in the aperture (e.g. for exclusion |
| 929 | * ranges. |
| 930 | */ |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 931 | static void dma_ops_reserve_addresses(struct dma_ops_domain *dom, |
| 932 | unsigned long start_page, |
| 933 | unsigned int pages) |
| 934 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 935 | unsigned int i, last_page = dom->aperture_size >> PAGE_SHIFT; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 936 | |
| 937 | if (start_page + pages > last_page) |
| 938 | pages = last_page - start_page; |
| 939 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 940 | for (i = start_page; i < start_page + pages; ++i) { |
| 941 | int index = i / APERTURE_RANGE_PAGES; |
| 942 | int page = i % APERTURE_RANGE_PAGES; |
| 943 | __set_bit(page, dom->aperture[index]->bitmap); |
| 944 | } |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 945 | } |
| 946 | |
Joerg Roedel | 86db2e5 | 2008-12-02 18:20:21 +0100 | [diff] [blame] | 947 | static void free_pagetable(struct protection_domain *domain) |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 948 | { |
| 949 | int i, j; |
| 950 | u64 *p1, *p2, *p3; |
| 951 | |
Joerg Roedel | 86db2e5 | 2008-12-02 18:20:21 +0100 | [diff] [blame] | 952 | p1 = domain->pt_root; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 953 | |
| 954 | if (!p1) |
| 955 | return; |
| 956 | |
| 957 | for (i = 0; i < 512; ++i) { |
| 958 | if (!IOMMU_PTE_PRESENT(p1[i])) |
| 959 | continue; |
| 960 | |
| 961 | p2 = IOMMU_PTE_PAGE(p1[i]); |
Joerg Roedel | 3cc3d84 | 2008-12-04 16:44:31 +0100 | [diff] [blame] | 962 | for (j = 0; j < 512; ++j) { |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 963 | if (!IOMMU_PTE_PRESENT(p2[j])) |
| 964 | continue; |
| 965 | p3 = IOMMU_PTE_PAGE(p2[j]); |
| 966 | free_page((unsigned long)p3); |
| 967 | } |
| 968 | |
| 969 | free_page((unsigned long)p2); |
| 970 | } |
| 971 | |
| 972 | free_page((unsigned long)p1); |
Joerg Roedel | 86db2e5 | 2008-12-02 18:20:21 +0100 | [diff] [blame] | 973 | |
| 974 | domain->pt_root = NULL; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 975 | } |
| 976 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 977 | /* |
| 978 | * Free a domain, only used if something went wrong in the |
| 979 | * allocation path and we need to free an already allocated page table |
| 980 | */ |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 981 | static void dma_ops_domain_free(struct dma_ops_domain *dom) |
| 982 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 983 | int i; |
| 984 | |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 985 | if (!dom) |
| 986 | return; |
| 987 | |
Joerg Roedel | 86db2e5 | 2008-12-02 18:20:21 +0100 | [diff] [blame] | 988 | free_pagetable(&dom->domain); |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 989 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 990 | for (i = 0; i < APERTURE_MAX_RANGES; ++i) { |
| 991 | if (!dom->aperture[i]) |
| 992 | continue; |
| 993 | free_page((unsigned long)dom->aperture[i]->bitmap); |
| 994 | kfree(dom->aperture[i]); |
| 995 | } |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 996 | |
| 997 | kfree(dom); |
| 998 | } |
| 999 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1000 | /* |
| 1001 | * Allocates a new protection domain usable for the dma_ops functions. |
| 1002 | * It also intializes the page table and the address allocator data |
| 1003 | * structures required for the dma_ops interface |
| 1004 | */ |
Joerg Roedel | d9cfed9 | 2009-05-19 12:16:29 +0200 | [diff] [blame] | 1005 | 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] | 1006 | { |
| 1007 | struct dma_ops_domain *dma_dom; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1008 | |
| 1009 | dma_dom = kzalloc(sizeof(struct dma_ops_domain), GFP_KERNEL); |
| 1010 | if (!dma_dom) |
| 1011 | return NULL; |
| 1012 | |
| 1013 | spin_lock_init(&dma_dom->domain.lock); |
| 1014 | |
| 1015 | dma_dom->domain.id = domain_id_alloc(); |
| 1016 | if (dma_dom->domain.id == 0) |
| 1017 | goto free_dma_dom; |
| 1018 | dma_dom->domain.mode = PAGE_MODE_3_LEVEL; |
| 1019 | dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL); |
Joerg Roedel | 9fdb19d | 2008-12-02 17:46:25 +0100 | [diff] [blame] | 1020 | dma_dom->domain.flags = PD_DMA_OPS_MASK; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1021 | dma_dom->domain.priv = dma_dom; |
| 1022 | if (!dma_dom->domain.pt_root) |
| 1023 | goto free_dma_dom; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1024 | |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 1025 | dma_dom->need_flush = false; |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 1026 | dma_dom->target_dev = 0xffff; |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 1027 | |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 1028 | if (alloc_new_range(iommu, dma_dom, true, GFP_KERNEL)) |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1029 | goto free_dma_dom; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1030 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1031 | /* |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1032 | * mark the first page as allocated so we never return 0 as |
| 1033 | * a valid dma-address. So we can use 0 as error value |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1034 | */ |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1035 | dma_dom->aperture[0]->bitmap[0] = 1; |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 1036 | dma_dom->next_address = 0; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1037 | |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1038 | |
| 1039 | return dma_dom; |
| 1040 | |
| 1041 | free_dma_dom: |
| 1042 | dma_ops_domain_free(dma_dom); |
| 1043 | |
| 1044 | return NULL; |
| 1045 | } |
| 1046 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1047 | /* |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1048 | * little helper function to check whether a given protection domain is a |
| 1049 | * dma_ops domain |
| 1050 | */ |
| 1051 | static bool dma_ops_domain(struct protection_domain *domain) |
| 1052 | { |
| 1053 | return domain->flags & PD_DMA_OPS_MASK; |
| 1054 | } |
| 1055 | |
| 1056 | /* |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1057 | * Find out the protection domain structure for a given PCI device. This |
| 1058 | * will give us the pointer to the page table root for example. |
| 1059 | */ |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1060 | static struct protection_domain *domain_for_device(u16 devid) |
| 1061 | { |
| 1062 | struct protection_domain *dom; |
| 1063 | unsigned long flags; |
| 1064 | |
| 1065 | read_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 1066 | dom = amd_iommu_pd_table[devid]; |
| 1067 | read_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 1068 | |
| 1069 | return dom; |
| 1070 | } |
| 1071 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1072 | /* |
| 1073 | * If a device is not yet associated with a domain, this function does |
| 1074 | * assigns it visible for the hardware |
| 1075 | */ |
Joerg Roedel | 0feae53 | 2009-08-26 15:26:30 +0200 | [diff] [blame^] | 1076 | static void __attach_device(struct amd_iommu *iommu, |
| 1077 | struct protection_domain *domain, |
| 1078 | u16 devid) |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1079 | { |
| 1080 | unsigned long flags; |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1081 | u64 pte_root = virt_to_phys(domain->pt_root); |
| 1082 | |
Joerg Roedel | 863c74e | 2008-12-02 17:56:36 +0100 | [diff] [blame] | 1083 | domain->dev_cnt += 1; |
| 1084 | |
Joerg Roedel | 38ddf41 | 2008-09-11 10:38:32 +0200 | [diff] [blame] | 1085 | pte_root |= (domain->mode & DEV_ENTRY_MODE_MASK) |
| 1086 | << DEV_ENTRY_MODE_SHIFT; |
| 1087 | 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] | 1088 | |
| 1089 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
Joerg Roedel | 38ddf41 | 2008-09-11 10:38:32 +0200 | [diff] [blame] | 1090 | amd_iommu_dev_table[devid].data[0] = lower_32_bits(pte_root); |
| 1091 | amd_iommu_dev_table[devid].data[1] = upper_32_bits(pte_root); |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1092 | amd_iommu_dev_table[devid].data[2] = domain->id; |
| 1093 | |
| 1094 | amd_iommu_pd_table[devid] = domain; |
| 1095 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
Joerg Roedel | 0feae53 | 2009-08-26 15:26:30 +0200 | [diff] [blame^] | 1096 | } |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1097 | |
Joerg Roedel | 0feae53 | 2009-08-26 15:26:30 +0200 | [diff] [blame^] | 1098 | static void attach_device(struct amd_iommu *iommu, |
| 1099 | struct protection_domain *domain, |
| 1100 | u16 devid) |
| 1101 | { |
| 1102 | __attach_device(iommu, domain, devid); |
| 1103 | |
| 1104 | /* |
| 1105 | * We might boot into a crash-kernel here. The crashed kernel |
| 1106 | * left the caches in the IOMMU dirty. So we have to flush |
| 1107 | * here to evict all dirty stuff. |
| 1108 | */ |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1109 | iommu_queue_inv_dev_entry(iommu, devid); |
Chris Wright | 42a49f9 | 2009-06-15 15:42:00 +0200 | [diff] [blame] | 1110 | iommu_flush_tlb_pde(iommu, domain->id); |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1111 | } |
| 1112 | |
Joerg Roedel | 355bf55 | 2008-12-08 12:02:41 +0100 | [diff] [blame] | 1113 | /* |
| 1114 | * Removes a device from a protection domain (unlocked) |
| 1115 | */ |
| 1116 | static void __detach_device(struct protection_domain *domain, u16 devid) |
| 1117 | { |
| 1118 | |
| 1119 | /* lock domain */ |
| 1120 | spin_lock(&domain->lock); |
| 1121 | |
| 1122 | /* remove domain from the lookup table */ |
| 1123 | amd_iommu_pd_table[devid] = NULL; |
| 1124 | |
| 1125 | /* remove entry from the device table seen by the hardware */ |
| 1126 | amd_iommu_dev_table[devid].data[0] = IOMMU_PTE_P | IOMMU_PTE_TV; |
| 1127 | amd_iommu_dev_table[devid].data[1] = 0; |
| 1128 | amd_iommu_dev_table[devid].data[2] = 0; |
| 1129 | |
| 1130 | /* decrease reference counter */ |
| 1131 | domain->dev_cnt -= 1; |
| 1132 | |
| 1133 | /* ready */ |
| 1134 | spin_unlock(&domain->lock); |
| 1135 | } |
| 1136 | |
| 1137 | /* |
| 1138 | * Removes a device from a protection domain (with devtable_lock held) |
| 1139 | */ |
| 1140 | static void detach_device(struct protection_domain *domain, u16 devid) |
| 1141 | { |
| 1142 | unsigned long flags; |
| 1143 | |
| 1144 | /* lock device table */ |
| 1145 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 1146 | __detach_device(domain, devid); |
| 1147 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 1148 | } |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1149 | |
| 1150 | static int device_change_notifier(struct notifier_block *nb, |
| 1151 | unsigned long action, void *data) |
| 1152 | { |
| 1153 | struct device *dev = data; |
| 1154 | struct pci_dev *pdev = to_pci_dev(dev); |
| 1155 | u16 devid = calc_devid(pdev->bus->number, pdev->devfn); |
| 1156 | struct protection_domain *domain; |
| 1157 | struct dma_ops_domain *dma_domain; |
| 1158 | struct amd_iommu *iommu; |
Joerg Roedel | 1ac4cbb | 2008-12-10 19:33:26 +0100 | [diff] [blame] | 1159 | unsigned long flags; |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1160 | |
| 1161 | if (devid > amd_iommu_last_bdf) |
| 1162 | goto out; |
| 1163 | |
| 1164 | devid = amd_iommu_alias_table[devid]; |
| 1165 | |
| 1166 | iommu = amd_iommu_rlookup_table[devid]; |
| 1167 | if (iommu == NULL) |
| 1168 | goto out; |
| 1169 | |
| 1170 | domain = domain_for_device(devid); |
| 1171 | |
| 1172 | if (domain && !dma_ops_domain(domain)) |
| 1173 | WARN_ONCE(1, "AMD IOMMU WARNING: device %s already bound " |
| 1174 | "to a non-dma-ops domain\n", dev_name(dev)); |
| 1175 | |
| 1176 | switch (action) { |
Chris Wright | c1eee67 | 2009-05-21 00:56:58 -0700 | [diff] [blame] | 1177 | case BUS_NOTIFY_UNBOUND_DRIVER: |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1178 | if (!domain) |
| 1179 | goto out; |
| 1180 | detach_device(domain, devid); |
| 1181 | break; |
Joerg Roedel | 1ac4cbb | 2008-12-10 19:33:26 +0100 | [diff] [blame] | 1182 | case BUS_NOTIFY_ADD_DEVICE: |
| 1183 | /* allocate a protection domain if a device is added */ |
| 1184 | dma_domain = find_protection_domain(devid); |
| 1185 | if (dma_domain) |
| 1186 | goto out; |
Joerg Roedel | d9cfed9 | 2009-05-19 12:16:29 +0200 | [diff] [blame] | 1187 | dma_domain = dma_ops_domain_alloc(iommu); |
Joerg Roedel | 1ac4cbb | 2008-12-10 19:33:26 +0100 | [diff] [blame] | 1188 | if (!dma_domain) |
| 1189 | goto out; |
| 1190 | dma_domain->target_dev = devid; |
| 1191 | |
| 1192 | spin_lock_irqsave(&iommu_pd_list_lock, flags); |
| 1193 | list_add_tail(&dma_domain->list, &iommu_pd_list); |
| 1194 | spin_unlock_irqrestore(&iommu_pd_list_lock, flags); |
| 1195 | |
| 1196 | break; |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1197 | default: |
| 1198 | goto out; |
| 1199 | } |
| 1200 | |
| 1201 | iommu_queue_inv_dev_entry(iommu, devid); |
| 1202 | iommu_completion_wait(iommu); |
| 1203 | |
| 1204 | out: |
| 1205 | return 0; |
| 1206 | } |
| 1207 | |
Jaswinder Singh Rajput | b25ae67 | 2009-07-01 19:53:14 +0530 | [diff] [blame] | 1208 | static struct notifier_block device_nb = { |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1209 | .notifier_call = device_change_notifier, |
| 1210 | }; |
Joerg Roedel | 355bf55 | 2008-12-08 12:02:41 +0100 | [diff] [blame] | 1211 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1212 | /***************************************************************************** |
| 1213 | * |
| 1214 | * The next functions belong to the dma_ops mapping/unmapping code. |
| 1215 | * |
| 1216 | *****************************************************************************/ |
| 1217 | |
| 1218 | /* |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1219 | * This function checks if the driver got a valid device from the caller to |
| 1220 | * avoid dereferencing invalid pointers. |
| 1221 | */ |
| 1222 | static bool check_device(struct device *dev) |
| 1223 | { |
| 1224 | if (!dev || !dev->dma_mask) |
| 1225 | return false; |
| 1226 | |
| 1227 | return true; |
| 1228 | } |
| 1229 | |
| 1230 | /* |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 1231 | * In this function the list of preallocated protection domains is traversed to |
| 1232 | * find the domain for a specific device |
| 1233 | */ |
| 1234 | static struct dma_ops_domain *find_protection_domain(u16 devid) |
| 1235 | { |
| 1236 | struct dma_ops_domain *entry, *ret = NULL; |
| 1237 | unsigned long flags; |
| 1238 | |
| 1239 | if (list_empty(&iommu_pd_list)) |
| 1240 | return NULL; |
| 1241 | |
| 1242 | spin_lock_irqsave(&iommu_pd_list_lock, flags); |
| 1243 | |
| 1244 | list_for_each_entry(entry, &iommu_pd_list, list) { |
| 1245 | if (entry->target_dev == devid) { |
| 1246 | ret = entry; |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 1247 | break; |
| 1248 | } |
| 1249 | } |
| 1250 | |
| 1251 | spin_unlock_irqrestore(&iommu_pd_list_lock, flags); |
| 1252 | |
| 1253 | return ret; |
| 1254 | } |
| 1255 | |
| 1256 | /* |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1257 | * In the dma_ops path we only have the struct device. This function |
| 1258 | * finds the corresponding IOMMU, the protection domain and the |
| 1259 | * requestor id for a given device. |
| 1260 | * If the device is not yet associated with a domain this is also done |
| 1261 | * in this function. |
| 1262 | */ |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1263 | static int get_device_resources(struct device *dev, |
| 1264 | struct amd_iommu **iommu, |
| 1265 | struct protection_domain **domain, |
| 1266 | u16 *bdf) |
| 1267 | { |
| 1268 | struct dma_ops_domain *dma_dom; |
| 1269 | struct pci_dev *pcidev; |
| 1270 | u16 _bdf; |
| 1271 | |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1272 | *iommu = NULL; |
| 1273 | *domain = NULL; |
| 1274 | *bdf = 0xffff; |
| 1275 | |
| 1276 | if (dev->bus != &pci_bus_type) |
| 1277 | return 0; |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1278 | |
| 1279 | pcidev = to_pci_dev(dev); |
Joerg Roedel | d591b0a | 2008-07-11 17:14:35 +0200 | [diff] [blame] | 1280 | _bdf = calc_devid(pcidev->bus->number, pcidev->devfn); |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1281 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1282 | /* device not translated by any IOMMU in the system? */ |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1283 | if (_bdf > amd_iommu_last_bdf) |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1284 | return 0; |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1285 | |
| 1286 | *bdf = amd_iommu_alias_table[_bdf]; |
| 1287 | |
| 1288 | *iommu = amd_iommu_rlookup_table[*bdf]; |
| 1289 | if (*iommu == NULL) |
| 1290 | return 0; |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1291 | *domain = domain_for_device(*bdf); |
| 1292 | if (*domain == NULL) { |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 1293 | dma_dom = find_protection_domain(*bdf); |
| 1294 | if (!dma_dom) |
| 1295 | dma_dom = (*iommu)->default_dom; |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1296 | *domain = &dma_dom->domain; |
Joerg Roedel | f1179dc | 2008-12-10 14:39:51 +0100 | [diff] [blame] | 1297 | attach_device(*iommu, *domain, *bdf); |
Joerg Roedel | e9a22a1 | 2009-06-09 12:00:37 +0200 | [diff] [blame] | 1298 | DUMP_printk("Using protection domain %d for device %s\n", |
| 1299 | (*domain)->id, dev_name(dev)); |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1300 | } |
| 1301 | |
Joerg Roedel | f91ba19 | 2008-11-25 12:56:12 +0100 | [diff] [blame] | 1302 | if (domain_for_device(_bdf) == NULL) |
Joerg Roedel | f1179dc | 2008-12-10 14:39:51 +0100 | [diff] [blame] | 1303 | attach_device(*iommu, *domain, _bdf); |
Joerg Roedel | f91ba19 | 2008-11-25 12:56:12 +0100 | [diff] [blame] | 1304 | |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1305 | return 1; |
| 1306 | } |
| 1307 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1308 | /* |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1309 | * If the pte_page is not yet allocated this function is called |
| 1310 | */ |
| 1311 | static u64* alloc_pte(struct protection_domain *dom, |
| 1312 | unsigned long address, u64 **pte_page, gfp_t gfp) |
| 1313 | { |
| 1314 | u64 *pte, *page; |
| 1315 | |
| 1316 | pte = &dom->pt_root[IOMMU_PTE_L2_INDEX(address)]; |
| 1317 | |
| 1318 | if (!IOMMU_PTE_PRESENT(*pte)) { |
| 1319 | page = (u64 *)get_zeroed_page(gfp); |
| 1320 | if (!page) |
| 1321 | return NULL; |
| 1322 | *pte = IOMMU_L2_PDE(virt_to_phys(page)); |
| 1323 | } |
| 1324 | |
| 1325 | pte = IOMMU_PTE_PAGE(*pte); |
| 1326 | pte = &pte[IOMMU_PTE_L1_INDEX(address)]; |
| 1327 | |
| 1328 | if (!IOMMU_PTE_PRESENT(*pte)) { |
| 1329 | page = (u64 *)get_zeroed_page(gfp); |
| 1330 | if (!page) |
| 1331 | return NULL; |
| 1332 | *pte = IOMMU_L1_PDE(virt_to_phys(page)); |
| 1333 | } |
| 1334 | |
| 1335 | pte = IOMMU_PTE_PAGE(*pte); |
| 1336 | |
| 1337 | if (pte_page) |
| 1338 | *pte_page = pte; |
| 1339 | |
| 1340 | pte = &pte[IOMMU_PTE_L0_INDEX(address)]; |
| 1341 | |
| 1342 | return pte; |
| 1343 | } |
| 1344 | |
| 1345 | /* |
| 1346 | * This function fetches the PTE for a given address in the aperture |
| 1347 | */ |
| 1348 | static u64* dma_ops_get_pte(struct dma_ops_domain *dom, |
| 1349 | unsigned long address) |
| 1350 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1351 | struct aperture_range *aperture; |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1352 | u64 *pte, *pte_page; |
| 1353 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1354 | aperture = dom->aperture[APERTURE_RANGE_INDEX(address)]; |
| 1355 | if (!aperture) |
| 1356 | return NULL; |
| 1357 | |
| 1358 | pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)]; |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1359 | if (!pte) { |
| 1360 | pte = alloc_pte(&dom->domain, address, &pte_page, GFP_ATOMIC); |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1361 | aperture->pte_pages[APERTURE_PAGE_INDEX(address)] = pte_page; |
| 1362 | } else |
| 1363 | pte += IOMMU_PTE_L0_INDEX(address); |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1364 | |
| 1365 | return pte; |
| 1366 | } |
| 1367 | |
| 1368 | /* |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1369 | * This is the generic map function. It maps one 4kb page at paddr to |
| 1370 | * the given address in the DMA address space for the domain. |
| 1371 | */ |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1372 | static dma_addr_t dma_ops_domain_map(struct amd_iommu *iommu, |
| 1373 | struct dma_ops_domain *dom, |
| 1374 | unsigned long address, |
| 1375 | phys_addr_t paddr, |
| 1376 | int direction) |
| 1377 | { |
| 1378 | u64 *pte, __pte; |
| 1379 | |
| 1380 | WARN_ON(address > dom->aperture_size); |
| 1381 | |
| 1382 | paddr &= PAGE_MASK; |
| 1383 | |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1384 | pte = dma_ops_get_pte(dom, address); |
Joerg Roedel | 53812c1 | 2009-05-12 12:17:38 +0200 | [diff] [blame] | 1385 | if (!pte) |
| 1386 | return bad_dma_address; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1387 | |
| 1388 | __pte = paddr | IOMMU_PTE_P | IOMMU_PTE_FC; |
| 1389 | |
| 1390 | if (direction == DMA_TO_DEVICE) |
| 1391 | __pte |= IOMMU_PTE_IR; |
| 1392 | else if (direction == DMA_FROM_DEVICE) |
| 1393 | __pte |= IOMMU_PTE_IW; |
| 1394 | else if (direction == DMA_BIDIRECTIONAL) |
| 1395 | __pte |= IOMMU_PTE_IR | IOMMU_PTE_IW; |
| 1396 | |
| 1397 | WARN_ON(*pte); |
| 1398 | |
| 1399 | *pte = __pte; |
| 1400 | |
| 1401 | return (dma_addr_t)address; |
| 1402 | } |
| 1403 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1404 | /* |
| 1405 | * The generic unmapping function for on page in the DMA address space. |
| 1406 | */ |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1407 | static void dma_ops_domain_unmap(struct amd_iommu *iommu, |
| 1408 | struct dma_ops_domain *dom, |
| 1409 | unsigned long address) |
| 1410 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1411 | struct aperture_range *aperture; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1412 | u64 *pte; |
| 1413 | |
| 1414 | if (address >= dom->aperture_size) |
| 1415 | return; |
| 1416 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1417 | aperture = dom->aperture[APERTURE_RANGE_INDEX(address)]; |
| 1418 | if (!aperture) |
| 1419 | return; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1420 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1421 | pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)]; |
| 1422 | if (!pte) |
| 1423 | return; |
| 1424 | |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1425 | pte += IOMMU_PTE_L0_INDEX(address); |
| 1426 | |
| 1427 | WARN_ON(!*pte); |
| 1428 | |
| 1429 | *pte = 0ULL; |
| 1430 | } |
| 1431 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1432 | /* |
| 1433 | * This function contains common code for mapping of a physically |
Joerg Roedel | 24f8116 | 2008-12-08 14:25:39 +0100 | [diff] [blame] | 1434 | * contiguous memory region into DMA address space. It is used by all |
| 1435 | * mapping functions provided with this IOMMU driver. |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1436 | * Must be called with the domain lock held. |
| 1437 | */ |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1438 | static dma_addr_t __map_single(struct device *dev, |
| 1439 | struct amd_iommu *iommu, |
| 1440 | struct dma_ops_domain *dma_dom, |
| 1441 | phys_addr_t paddr, |
| 1442 | size_t size, |
Joerg Roedel | 6d4f343 | 2008-09-04 19:18:02 +0200 | [diff] [blame] | 1443 | int dir, |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1444 | bool align, |
| 1445 | u64 dma_mask) |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1446 | { |
| 1447 | dma_addr_t offset = paddr & ~PAGE_MASK; |
Joerg Roedel | 53812c1 | 2009-05-12 12:17:38 +0200 | [diff] [blame] | 1448 | dma_addr_t address, start, ret; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1449 | unsigned int pages; |
Joerg Roedel | 6d4f343 | 2008-09-04 19:18:02 +0200 | [diff] [blame] | 1450 | unsigned long align_mask = 0; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1451 | int i; |
| 1452 | |
Joerg Roedel | e3c449f | 2008-10-15 22:02:11 -0700 | [diff] [blame] | 1453 | pages = iommu_num_pages(paddr, size, PAGE_SIZE); |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1454 | paddr &= PAGE_MASK; |
| 1455 | |
Joerg Roedel | 8ecaf8f | 2008-12-12 16:13:04 +0100 | [diff] [blame] | 1456 | INC_STATS_COUNTER(total_map_requests); |
| 1457 | |
Joerg Roedel | c185897 | 2008-12-12 15:42:39 +0100 | [diff] [blame] | 1458 | if (pages > 1) |
| 1459 | INC_STATS_COUNTER(cross_page); |
| 1460 | |
Joerg Roedel | 6d4f343 | 2008-09-04 19:18:02 +0200 | [diff] [blame] | 1461 | if (align) |
| 1462 | align_mask = (1UL << get_order(size)) - 1; |
| 1463 | |
Joerg Roedel | 11b8388 | 2009-05-19 10:23:15 +0200 | [diff] [blame] | 1464 | retry: |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1465 | address = dma_ops_alloc_addresses(dev, dma_dom, pages, align_mask, |
| 1466 | dma_mask); |
Joerg Roedel | 11b8388 | 2009-05-19 10:23:15 +0200 | [diff] [blame] | 1467 | if (unlikely(address == bad_dma_address)) { |
| 1468 | /* |
| 1469 | * setting next_address here will let the address |
| 1470 | * allocator only scan the new allocated range in the |
| 1471 | * first run. This is a small optimization. |
| 1472 | */ |
| 1473 | dma_dom->next_address = dma_dom->aperture_size; |
| 1474 | |
| 1475 | if (alloc_new_range(iommu, dma_dom, false, GFP_ATOMIC)) |
| 1476 | goto out; |
| 1477 | |
| 1478 | /* |
| 1479 | * aperture was sucessfully enlarged by 128 MB, try |
| 1480 | * allocation again |
| 1481 | */ |
| 1482 | goto retry; |
| 1483 | } |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1484 | |
| 1485 | start = address; |
| 1486 | for (i = 0; i < pages; ++i) { |
Joerg Roedel | 53812c1 | 2009-05-12 12:17:38 +0200 | [diff] [blame] | 1487 | ret = dma_ops_domain_map(iommu, dma_dom, start, paddr, dir); |
| 1488 | if (ret == bad_dma_address) |
| 1489 | goto out_unmap; |
| 1490 | |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1491 | paddr += PAGE_SIZE; |
| 1492 | start += PAGE_SIZE; |
| 1493 | } |
| 1494 | address += offset; |
| 1495 | |
Joerg Roedel | 5774f7c | 2008-12-12 15:57:30 +0100 | [diff] [blame] | 1496 | ADD_STATS_COUNTER(alloced_io_mem, size); |
| 1497 | |
FUJITA Tomonori | afa9fdc | 2008-09-20 01:23:30 +0900 | [diff] [blame] | 1498 | if (unlikely(dma_dom->need_flush && !amd_iommu_unmap_flush)) { |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 1499 | iommu_flush_tlb(iommu, dma_dom->domain.id); |
| 1500 | dma_dom->need_flush = false; |
| 1501 | } else if (unlikely(iommu_has_npcache(iommu))) |
Joerg Roedel | 270cab24 | 2008-09-04 15:49:46 +0200 | [diff] [blame] | 1502 | iommu_flush_pages(iommu, dma_dom->domain.id, address, size); |
| 1503 | |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1504 | out: |
| 1505 | return address; |
Joerg Roedel | 53812c1 | 2009-05-12 12:17:38 +0200 | [diff] [blame] | 1506 | |
| 1507 | out_unmap: |
| 1508 | |
| 1509 | for (--i; i >= 0; --i) { |
| 1510 | start -= PAGE_SIZE; |
| 1511 | dma_ops_domain_unmap(iommu, dma_dom, start); |
| 1512 | } |
| 1513 | |
| 1514 | dma_ops_free_addresses(dma_dom, address, pages); |
| 1515 | |
| 1516 | return bad_dma_address; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1517 | } |
| 1518 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1519 | /* |
| 1520 | * Does the reverse of the __map_single function. Must be called with |
| 1521 | * the domain lock held too |
| 1522 | */ |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1523 | static void __unmap_single(struct amd_iommu *iommu, |
| 1524 | struct dma_ops_domain *dma_dom, |
| 1525 | dma_addr_t dma_addr, |
| 1526 | size_t size, |
| 1527 | int dir) |
| 1528 | { |
| 1529 | dma_addr_t i, start; |
| 1530 | unsigned int pages; |
| 1531 | |
Joerg Roedel | b8d9905 | 2008-12-08 14:40:26 +0100 | [diff] [blame] | 1532 | if ((dma_addr == bad_dma_address) || |
| 1533 | (dma_addr + size > dma_dom->aperture_size)) |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1534 | return; |
| 1535 | |
Joerg Roedel | e3c449f | 2008-10-15 22:02:11 -0700 | [diff] [blame] | 1536 | pages = iommu_num_pages(dma_addr, size, PAGE_SIZE); |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1537 | dma_addr &= PAGE_MASK; |
| 1538 | start = dma_addr; |
| 1539 | |
| 1540 | for (i = 0; i < pages; ++i) { |
| 1541 | dma_ops_domain_unmap(iommu, dma_dom, start); |
| 1542 | start += PAGE_SIZE; |
| 1543 | } |
| 1544 | |
Joerg Roedel | 5774f7c | 2008-12-12 15:57:30 +0100 | [diff] [blame] | 1545 | SUB_STATS_COUNTER(alloced_io_mem, size); |
| 1546 | |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1547 | dma_ops_free_addresses(dma_dom, dma_addr, pages); |
Joerg Roedel | 270cab24 | 2008-09-04 15:49:46 +0200 | [diff] [blame] | 1548 | |
Joerg Roedel | 80be308 | 2008-11-06 14:59:05 +0100 | [diff] [blame] | 1549 | if (amd_iommu_unmap_flush || dma_dom->need_flush) { |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 1550 | iommu_flush_pages(iommu, dma_dom->domain.id, dma_addr, size); |
Joerg Roedel | 80be308 | 2008-11-06 14:59:05 +0100 | [diff] [blame] | 1551 | dma_dom->need_flush = false; |
| 1552 | } |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1553 | } |
| 1554 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1555 | /* |
| 1556 | * The exported map_single function for dma_ops. |
| 1557 | */ |
FUJITA Tomonori | 5149136 | 2009-01-05 23:47:25 +0900 | [diff] [blame] | 1558 | static dma_addr_t map_page(struct device *dev, struct page *page, |
| 1559 | unsigned long offset, size_t size, |
| 1560 | enum dma_data_direction dir, |
| 1561 | struct dma_attrs *attrs) |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1562 | { |
| 1563 | unsigned long flags; |
| 1564 | struct amd_iommu *iommu; |
| 1565 | struct protection_domain *domain; |
| 1566 | u16 devid; |
| 1567 | dma_addr_t addr; |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1568 | u64 dma_mask; |
FUJITA Tomonori | 5149136 | 2009-01-05 23:47:25 +0900 | [diff] [blame] | 1569 | phys_addr_t paddr = page_to_phys(page) + offset; |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1570 | |
Joerg Roedel | 0f2a86f | 2008-12-12 15:05:16 +0100 | [diff] [blame] | 1571 | INC_STATS_COUNTER(cnt_map_single); |
| 1572 | |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1573 | if (!check_device(dev)) |
| 1574 | return bad_dma_address; |
| 1575 | |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1576 | dma_mask = *dev->dma_mask; |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1577 | |
| 1578 | get_device_resources(dev, &iommu, &domain, &devid); |
| 1579 | |
| 1580 | if (iommu == NULL || domain == NULL) |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1581 | /* device not handled by any AMD IOMMU */ |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1582 | return (dma_addr_t)paddr; |
| 1583 | |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1584 | if (!dma_ops_domain(domain)) |
| 1585 | return bad_dma_address; |
| 1586 | |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1587 | spin_lock_irqsave(&domain->lock, flags); |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1588 | addr = __map_single(dev, iommu, domain->priv, paddr, size, dir, false, |
| 1589 | dma_mask); |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1590 | if (addr == bad_dma_address) |
| 1591 | goto out; |
| 1592 | |
Joerg Roedel | 09ee17e | 2008-12-03 12:19:27 +0100 | [diff] [blame] | 1593 | iommu_completion_wait(iommu); |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1594 | |
| 1595 | out: |
| 1596 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1597 | |
| 1598 | return addr; |
| 1599 | } |
| 1600 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1601 | /* |
| 1602 | * The exported unmap_single function for dma_ops. |
| 1603 | */ |
FUJITA Tomonori | 5149136 | 2009-01-05 23:47:25 +0900 | [diff] [blame] | 1604 | static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size, |
| 1605 | enum dma_data_direction dir, struct dma_attrs *attrs) |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1606 | { |
| 1607 | unsigned long flags; |
| 1608 | struct amd_iommu *iommu; |
| 1609 | struct protection_domain *domain; |
| 1610 | u16 devid; |
| 1611 | |
Joerg Roedel | 146a691 | 2008-12-12 15:07:12 +0100 | [diff] [blame] | 1612 | INC_STATS_COUNTER(cnt_unmap_single); |
| 1613 | |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1614 | if (!check_device(dev) || |
| 1615 | !get_device_resources(dev, &iommu, &domain, &devid)) |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1616 | /* device not handled by any AMD IOMMU */ |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1617 | return; |
| 1618 | |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1619 | if (!dma_ops_domain(domain)) |
| 1620 | return; |
| 1621 | |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1622 | spin_lock_irqsave(&domain->lock, flags); |
| 1623 | |
| 1624 | __unmap_single(iommu, domain->priv, dma_addr, size, dir); |
| 1625 | |
Joerg Roedel | 09ee17e | 2008-12-03 12:19:27 +0100 | [diff] [blame] | 1626 | iommu_completion_wait(iommu); |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1627 | |
| 1628 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1629 | } |
| 1630 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1631 | /* |
| 1632 | * This is a special map_sg function which is used if we should map a |
| 1633 | * device which is not handled by an AMD IOMMU in the system. |
| 1634 | */ |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1635 | static int map_sg_no_iommu(struct device *dev, struct scatterlist *sglist, |
| 1636 | int nelems, int dir) |
| 1637 | { |
| 1638 | struct scatterlist *s; |
| 1639 | int i; |
| 1640 | |
| 1641 | for_each_sg(sglist, s, nelems, i) { |
| 1642 | s->dma_address = (dma_addr_t)sg_phys(s); |
| 1643 | s->dma_length = s->length; |
| 1644 | } |
| 1645 | |
| 1646 | return nelems; |
| 1647 | } |
| 1648 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1649 | /* |
| 1650 | * The exported map_sg function for dma_ops (handles scatter-gather |
| 1651 | * lists). |
| 1652 | */ |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1653 | static int map_sg(struct device *dev, struct scatterlist *sglist, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 1654 | int nelems, enum dma_data_direction dir, |
| 1655 | struct dma_attrs *attrs) |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1656 | { |
| 1657 | unsigned long flags; |
| 1658 | struct amd_iommu *iommu; |
| 1659 | struct protection_domain *domain; |
| 1660 | u16 devid; |
| 1661 | int i; |
| 1662 | struct scatterlist *s; |
| 1663 | phys_addr_t paddr; |
| 1664 | int mapped_elems = 0; |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1665 | u64 dma_mask; |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1666 | |
Joerg Roedel | d03f067a | 2008-12-12 15:09:48 +0100 | [diff] [blame] | 1667 | INC_STATS_COUNTER(cnt_map_sg); |
| 1668 | |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1669 | if (!check_device(dev)) |
| 1670 | return 0; |
| 1671 | |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1672 | dma_mask = *dev->dma_mask; |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1673 | |
| 1674 | get_device_resources(dev, &iommu, &domain, &devid); |
| 1675 | |
| 1676 | if (!iommu || !domain) |
| 1677 | return map_sg_no_iommu(dev, sglist, nelems, dir); |
| 1678 | |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1679 | if (!dma_ops_domain(domain)) |
| 1680 | return 0; |
| 1681 | |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1682 | spin_lock_irqsave(&domain->lock, flags); |
| 1683 | |
| 1684 | for_each_sg(sglist, s, nelems, i) { |
| 1685 | paddr = sg_phys(s); |
| 1686 | |
| 1687 | s->dma_address = __map_single(dev, iommu, domain->priv, |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1688 | paddr, s->length, dir, false, |
| 1689 | dma_mask); |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1690 | |
| 1691 | if (s->dma_address) { |
| 1692 | s->dma_length = s->length; |
| 1693 | mapped_elems++; |
| 1694 | } else |
| 1695 | goto unmap; |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1696 | } |
| 1697 | |
Joerg Roedel | 09ee17e | 2008-12-03 12:19:27 +0100 | [diff] [blame] | 1698 | iommu_completion_wait(iommu); |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1699 | |
| 1700 | out: |
| 1701 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1702 | |
| 1703 | return mapped_elems; |
| 1704 | unmap: |
| 1705 | for_each_sg(sglist, s, mapped_elems, i) { |
| 1706 | if (s->dma_address) |
| 1707 | __unmap_single(iommu, domain->priv, s->dma_address, |
| 1708 | s->dma_length, dir); |
| 1709 | s->dma_address = s->dma_length = 0; |
| 1710 | } |
| 1711 | |
| 1712 | mapped_elems = 0; |
| 1713 | |
| 1714 | goto out; |
| 1715 | } |
| 1716 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1717 | /* |
| 1718 | * The exported map_sg function for dma_ops (handles scatter-gather |
| 1719 | * lists). |
| 1720 | */ |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1721 | static void unmap_sg(struct device *dev, struct scatterlist *sglist, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 1722 | int nelems, enum dma_data_direction dir, |
| 1723 | struct dma_attrs *attrs) |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1724 | { |
| 1725 | unsigned long flags; |
| 1726 | struct amd_iommu *iommu; |
| 1727 | struct protection_domain *domain; |
| 1728 | struct scatterlist *s; |
| 1729 | u16 devid; |
| 1730 | int i; |
| 1731 | |
Joerg Roedel | 55877a6 | 2008-12-12 15:12:14 +0100 | [diff] [blame] | 1732 | INC_STATS_COUNTER(cnt_unmap_sg); |
| 1733 | |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1734 | if (!check_device(dev) || |
| 1735 | !get_device_resources(dev, &iommu, &domain, &devid)) |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1736 | return; |
| 1737 | |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1738 | if (!dma_ops_domain(domain)) |
| 1739 | return; |
| 1740 | |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1741 | spin_lock_irqsave(&domain->lock, flags); |
| 1742 | |
| 1743 | for_each_sg(sglist, s, nelems, i) { |
| 1744 | __unmap_single(iommu, domain->priv, s->dma_address, |
| 1745 | s->dma_length, dir); |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1746 | s->dma_address = s->dma_length = 0; |
| 1747 | } |
| 1748 | |
Joerg Roedel | 09ee17e | 2008-12-03 12:19:27 +0100 | [diff] [blame] | 1749 | iommu_completion_wait(iommu); |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1750 | |
| 1751 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1752 | } |
| 1753 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1754 | /* |
| 1755 | * The exported alloc_coherent function for dma_ops. |
| 1756 | */ |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1757 | static void *alloc_coherent(struct device *dev, size_t size, |
| 1758 | dma_addr_t *dma_addr, gfp_t flag) |
| 1759 | { |
| 1760 | unsigned long flags; |
| 1761 | void *virt_addr; |
| 1762 | struct amd_iommu *iommu; |
| 1763 | struct protection_domain *domain; |
| 1764 | u16 devid; |
| 1765 | phys_addr_t paddr; |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1766 | u64 dma_mask = dev->coherent_dma_mask; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1767 | |
Joerg Roedel | c8f0fb3 | 2008-12-12 15:14:21 +0100 | [diff] [blame] | 1768 | INC_STATS_COUNTER(cnt_alloc_coherent); |
| 1769 | |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1770 | if (!check_device(dev)) |
| 1771 | return NULL; |
| 1772 | |
FUJITA Tomonori | 13d9fea | 2008-09-10 20:19:40 +0900 | [diff] [blame] | 1773 | if (!get_device_resources(dev, &iommu, &domain, &devid)) |
| 1774 | flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32); |
| 1775 | |
Joerg Roedel | c97ac53 | 2008-09-11 10:59:15 +0200 | [diff] [blame] | 1776 | flag |= __GFP_ZERO; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1777 | virt_addr = (void *)__get_free_pages(flag, get_order(size)); |
| 1778 | if (!virt_addr) |
Jaswinder Singh Rajput | b25ae67 | 2009-07-01 19:53:14 +0530 | [diff] [blame] | 1779 | return NULL; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1780 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1781 | paddr = virt_to_phys(virt_addr); |
| 1782 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1783 | if (!iommu || !domain) { |
| 1784 | *dma_addr = (dma_addr_t)paddr; |
| 1785 | return virt_addr; |
| 1786 | } |
| 1787 | |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1788 | if (!dma_ops_domain(domain)) |
| 1789 | goto out_free; |
| 1790 | |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1791 | if (!dma_mask) |
| 1792 | dma_mask = *dev->dma_mask; |
| 1793 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1794 | spin_lock_irqsave(&domain->lock, flags); |
| 1795 | |
| 1796 | *dma_addr = __map_single(dev, iommu, domain->priv, paddr, |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1797 | size, DMA_BIDIRECTIONAL, true, dma_mask); |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1798 | |
Jiri Slaby | 367d04c | 2009-05-28 09:54:48 +0200 | [diff] [blame] | 1799 | if (*dma_addr == bad_dma_address) { |
| 1800 | spin_unlock_irqrestore(&domain->lock, flags); |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1801 | goto out_free; |
Jiri Slaby | 367d04c | 2009-05-28 09:54:48 +0200 | [diff] [blame] | 1802 | } |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1803 | |
Joerg Roedel | 09ee17e | 2008-12-03 12:19:27 +0100 | [diff] [blame] | 1804 | iommu_completion_wait(iommu); |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1805 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1806 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1807 | |
| 1808 | return virt_addr; |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1809 | |
| 1810 | out_free: |
| 1811 | |
| 1812 | free_pages((unsigned long)virt_addr, get_order(size)); |
| 1813 | |
| 1814 | return NULL; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1815 | } |
| 1816 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1817 | /* |
| 1818 | * The exported free_coherent function for dma_ops. |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1819 | */ |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1820 | static void free_coherent(struct device *dev, size_t size, |
| 1821 | void *virt_addr, dma_addr_t dma_addr) |
| 1822 | { |
| 1823 | unsigned long flags; |
| 1824 | struct amd_iommu *iommu; |
| 1825 | struct protection_domain *domain; |
| 1826 | u16 devid; |
| 1827 | |
Joerg Roedel | 5d31ee7 | 2008-12-12 15:16:38 +0100 | [diff] [blame] | 1828 | INC_STATS_COUNTER(cnt_free_coherent); |
| 1829 | |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1830 | if (!check_device(dev)) |
| 1831 | return; |
| 1832 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1833 | get_device_resources(dev, &iommu, &domain, &devid); |
| 1834 | |
| 1835 | if (!iommu || !domain) |
| 1836 | goto free_mem; |
| 1837 | |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1838 | if (!dma_ops_domain(domain)) |
| 1839 | goto free_mem; |
| 1840 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1841 | spin_lock_irqsave(&domain->lock, flags); |
| 1842 | |
| 1843 | __unmap_single(iommu, domain->priv, dma_addr, size, DMA_BIDIRECTIONAL); |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1844 | |
Joerg Roedel | 09ee17e | 2008-12-03 12:19:27 +0100 | [diff] [blame] | 1845 | iommu_completion_wait(iommu); |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1846 | |
| 1847 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1848 | |
| 1849 | free_mem: |
| 1850 | free_pages((unsigned long)virt_addr, get_order(size)); |
| 1851 | } |
| 1852 | |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 1853 | /* |
Joerg Roedel | b39ba6a | 2008-09-09 18:40:46 +0200 | [diff] [blame] | 1854 | * This function is called by the DMA layer to find out if we can handle a |
| 1855 | * particular device. It is part of the dma_ops. |
| 1856 | */ |
| 1857 | static int amd_iommu_dma_supported(struct device *dev, u64 mask) |
| 1858 | { |
| 1859 | u16 bdf; |
| 1860 | struct pci_dev *pcidev; |
| 1861 | |
| 1862 | /* No device or no PCI device */ |
| 1863 | if (!dev || dev->bus != &pci_bus_type) |
| 1864 | return 0; |
| 1865 | |
| 1866 | pcidev = to_pci_dev(dev); |
| 1867 | |
| 1868 | bdf = calc_devid(pcidev->bus->number, pcidev->devfn); |
| 1869 | |
| 1870 | /* Out of our scope? */ |
| 1871 | if (bdf > amd_iommu_last_bdf) |
| 1872 | return 0; |
| 1873 | |
| 1874 | return 1; |
| 1875 | } |
| 1876 | |
| 1877 | /* |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1878 | * The function for pre-allocating protection domains. |
| 1879 | * |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 1880 | * If the driver core informs the DMA layer if a driver grabs a device |
| 1881 | * we don't need to preallocate the protection domains anymore. |
| 1882 | * For now we have to. |
| 1883 | */ |
Jaswinder Singh Rajput | 0e93dd8 | 2008-12-29 21:45:22 +0530 | [diff] [blame] | 1884 | static void prealloc_protection_domains(void) |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 1885 | { |
| 1886 | struct pci_dev *dev = NULL; |
| 1887 | struct dma_ops_domain *dma_dom; |
| 1888 | struct amd_iommu *iommu; |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 1889 | u16 devid; |
| 1890 | |
| 1891 | while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { |
Joerg Roedel | edcb34d | 2008-12-10 20:01:45 +0100 | [diff] [blame] | 1892 | devid = calc_devid(dev->bus->number, dev->devfn); |
Joerg Roedel | 3a61ec3 | 2008-07-25 13:07:50 +0200 | [diff] [blame] | 1893 | if (devid > amd_iommu_last_bdf) |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 1894 | continue; |
| 1895 | devid = amd_iommu_alias_table[devid]; |
| 1896 | if (domain_for_device(devid)) |
| 1897 | continue; |
| 1898 | iommu = amd_iommu_rlookup_table[devid]; |
| 1899 | if (!iommu) |
| 1900 | continue; |
Joerg Roedel | d9cfed9 | 2009-05-19 12:16:29 +0200 | [diff] [blame] | 1901 | dma_dom = dma_ops_domain_alloc(iommu); |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 1902 | if (!dma_dom) |
| 1903 | continue; |
| 1904 | init_unity_mappings_for_device(dma_dom, devid); |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 1905 | dma_dom->target_dev = devid; |
| 1906 | |
| 1907 | list_add_tail(&dma_dom->list, &iommu_pd_list); |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 1908 | } |
| 1909 | } |
| 1910 | |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 1911 | static struct dma_map_ops amd_iommu_dma_ops = { |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1912 | .alloc_coherent = alloc_coherent, |
| 1913 | .free_coherent = free_coherent, |
FUJITA Tomonori | 5149136 | 2009-01-05 23:47:25 +0900 | [diff] [blame] | 1914 | .map_page = map_page, |
| 1915 | .unmap_page = unmap_page, |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1916 | .map_sg = map_sg, |
| 1917 | .unmap_sg = unmap_sg, |
Joerg Roedel | b39ba6a | 2008-09-09 18:40:46 +0200 | [diff] [blame] | 1918 | .dma_supported = amd_iommu_dma_supported, |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1919 | }; |
| 1920 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1921 | /* |
| 1922 | * The function which clues the AMD IOMMU driver into dma_ops. |
| 1923 | */ |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1924 | int __init amd_iommu_init_dma_ops(void) |
| 1925 | { |
| 1926 | struct amd_iommu *iommu; |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1927 | int ret; |
| 1928 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1929 | /* |
| 1930 | * first allocate a default protection domain for every IOMMU we |
| 1931 | * found in the system. Devices not assigned to any other |
| 1932 | * protection domain will be assigned to the default one. |
| 1933 | */ |
Joerg Roedel | 3bd2217 | 2009-05-04 15:06:20 +0200 | [diff] [blame] | 1934 | for_each_iommu(iommu) { |
Joerg Roedel | d9cfed9 | 2009-05-19 12:16:29 +0200 | [diff] [blame] | 1935 | iommu->default_dom = dma_ops_domain_alloc(iommu); |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1936 | if (iommu->default_dom == NULL) |
| 1937 | return -ENOMEM; |
Joerg Roedel | e2dc14a | 2008-12-10 18:48:59 +0100 | [diff] [blame] | 1938 | iommu->default_dom->domain.flags |= PD_DEFAULT_MASK; |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1939 | ret = iommu_init_unity_mappings(iommu); |
| 1940 | if (ret) |
| 1941 | goto free_domains; |
| 1942 | } |
| 1943 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1944 | /* |
| 1945 | * If device isolation is enabled, pre-allocate the protection |
| 1946 | * domains for each device. |
| 1947 | */ |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1948 | if (amd_iommu_isolate) |
| 1949 | prealloc_protection_domains(); |
| 1950 | |
| 1951 | iommu_detected = 1; |
| 1952 | force_iommu = 1; |
| 1953 | bad_dma_address = 0; |
Ingo Molnar | 92af4e2 | 2008-06-27 10:48:16 +0200 | [diff] [blame] | 1954 | #ifdef CONFIG_GART_IOMMU |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1955 | gart_iommu_aperture_disabled = 1; |
| 1956 | gart_iommu_aperture = 0; |
Ingo Molnar | 92af4e2 | 2008-06-27 10:48:16 +0200 | [diff] [blame] | 1957 | #endif |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1958 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1959 | /* Make the driver finally visible to the drivers */ |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1960 | dma_ops = &amd_iommu_dma_ops; |
| 1961 | |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 1962 | register_iommu(&amd_iommu_ops); |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 1963 | |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1964 | bus_register_notifier(&pci_bus_type, &device_nb); |
| 1965 | |
Joerg Roedel | 7f26508 | 2008-12-12 13:50:21 +0100 | [diff] [blame] | 1966 | amd_iommu_stats_init(); |
| 1967 | |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1968 | return 0; |
| 1969 | |
| 1970 | free_domains: |
| 1971 | |
Joerg Roedel | 3bd2217 | 2009-05-04 15:06:20 +0200 | [diff] [blame] | 1972 | for_each_iommu(iommu) { |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1973 | if (iommu->default_dom) |
| 1974 | dma_ops_domain_free(iommu->default_dom); |
| 1975 | } |
| 1976 | |
| 1977 | return ret; |
| 1978 | } |
Joerg Roedel | 6d98cd8 | 2008-12-08 12:05:55 +0100 | [diff] [blame] | 1979 | |
| 1980 | /***************************************************************************** |
| 1981 | * |
| 1982 | * The following functions belong to the exported interface of AMD IOMMU |
| 1983 | * |
| 1984 | * This interface allows access to lower level functions of the IOMMU |
| 1985 | * like protection domain handling and assignement of devices to domains |
| 1986 | * which is not possible with the dma_ops interface. |
| 1987 | * |
| 1988 | *****************************************************************************/ |
| 1989 | |
Joerg Roedel | 6d98cd8 | 2008-12-08 12:05:55 +0100 | [diff] [blame] | 1990 | static void cleanup_domain(struct protection_domain *domain) |
| 1991 | { |
| 1992 | unsigned long flags; |
| 1993 | u16 devid; |
| 1994 | |
| 1995 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 1996 | |
| 1997 | for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) |
| 1998 | if (amd_iommu_pd_table[devid] == domain) |
| 1999 | __detach_device(domain, devid); |
| 2000 | |
| 2001 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 2002 | } |
| 2003 | |
Joerg Roedel | 2650815 | 2009-08-26 16:52:40 +0200 | [diff] [blame] | 2004 | static void protection_domain_free(struct protection_domain *domain) |
| 2005 | { |
| 2006 | if (!domain) |
| 2007 | return; |
| 2008 | |
| 2009 | if (domain->id) |
| 2010 | domain_id_free(domain->id); |
| 2011 | |
| 2012 | kfree(domain); |
| 2013 | } |
| 2014 | |
| 2015 | static struct protection_domain *protection_domain_alloc(void) |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 2016 | { |
| 2017 | struct protection_domain *domain; |
| 2018 | |
| 2019 | domain = kzalloc(sizeof(*domain), GFP_KERNEL); |
| 2020 | if (!domain) |
Joerg Roedel | 2650815 | 2009-08-26 16:52:40 +0200 | [diff] [blame] | 2021 | return NULL; |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 2022 | |
| 2023 | spin_lock_init(&domain->lock); |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 2024 | domain->id = domain_id_alloc(); |
| 2025 | if (!domain->id) |
Joerg Roedel | 2650815 | 2009-08-26 16:52:40 +0200 | [diff] [blame] | 2026 | goto out_err; |
| 2027 | |
| 2028 | return domain; |
| 2029 | |
| 2030 | out_err: |
| 2031 | kfree(domain); |
| 2032 | |
| 2033 | return NULL; |
| 2034 | } |
| 2035 | |
| 2036 | static int amd_iommu_domain_init(struct iommu_domain *dom) |
| 2037 | { |
| 2038 | struct protection_domain *domain; |
| 2039 | |
| 2040 | domain = protection_domain_alloc(); |
| 2041 | if (!domain) |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 2042 | goto out_free; |
Joerg Roedel | 2650815 | 2009-08-26 16:52:40 +0200 | [diff] [blame] | 2043 | |
| 2044 | domain->mode = PAGE_MODE_3_LEVEL; |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 2045 | domain->pt_root = (void *)get_zeroed_page(GFP_KERNEL); |
| 2046 | if (!domain->pt_root) |
| 2047 | goto out_free; |
| 2048 | |
| 2049 | dom->priv = domain; |
| 2050 | |
| 2051 | return 0; |
| 2052 | |
| 2053 | out_free: |
Joerg Roedel | 2650815 | 2009-08-26 16:52:40 +0200 | [diff] [blame] | 2054 | protection_domain_free(domain); |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 2055 | |
| 2056 | return -ENOMEM; |
| 2057 | } |
| 2058 | |
Joerg Roedel | 98383fc | 2008-12-02 18:34:12 +0100 | [diff] [blame] | 2059 | static void amd_iommu_domain_destroy(struct iommu_domain *dom) |
| 2060 | { |
| 2061 | struct protection_domain *domain = dom->priv; |
| 2062 | |
| 2063 | if (!domain) |
| 2064 | return; |
| 2065 | |
| 2066 | if (domain->dev_cnt > 0) |
| 2067 | cleanup_domain(domain); |
| 2068 | |
| 2069 | BUG_ON(domain->dev_cnt != 0); |
| 2070 | |
| 2071 | free_pagetable(domain); |
| 2072 | |
| 2073 | domain_id_free(domain->id); |
| 2074 | |
| 2075 | kfree(domain); |
| 2076 | |
| 2077 | dom->priv = NULL; |
| 2078 | } |
| 2079 | |
Joerg Roedel | 684f288 | 2008-12-08 12:07:44 +0100 | [diff] [blame] | 2080 | static void amd_iommu_detach_device(struct iommu_domain *dom, |
| 2081 | struct device *dev) |
| 2082 | { |
| 2083 | struct protection_domain *domain = dom->priv; |
| 2084 | struct amd_iommu *iommu; |
| 2085 | struct pci_dev *pdev; |
| 2086 | u16 devid; |
| 2087 | |
| 2088 | if (dev->bus != &pci_bus_type) |
| 2089 | return; |
| 2090 | |
| 2091 | pdev = to_pci_dev(dev); |
| 2092 | |
| 2093 | devid = calc_devid(pdev->bus->number, pdev->devfn); |
| 2094 | |
| 2095 | if (devid > 0) |
| 2096 | detach_device(domain, devid); |
| 2097 | |
| 2098 | iommu = amd_iommu_rlookup_table[devid]; |
| 2099 | if (!iommu) |
| 2100 | return; |
| 2101 | |
| 2102 | iommu_queue_inv_dev_entry(iommu, devid); |
| 2103 | iommu_completion_wait(iommu); |
| 2104 | } |
| 2105 | |
Joerg Roedel | 0110606 | 2008-12-02 19:34:11 +0100 | [diff] [blame] | 2106 | static int amd_iommu_attach_device(struct iommu_domain *dom, |
| 2107 | struct device *dev) |
| 2108 | { |
| 2109 | struct protection_domain *domain = dom->priv; |
| 2110 | struct protection_domain *old_domain; |
| 2111 | struct amd_iommu *iommu; |
| 2112 | struct pci_dev *pdev; |
| 2113 | u16 devid; |
| 2114 | |
| 2115 | if (dev->bus != &pci_bus_type) |
| 2116 | return -EINVAL; |
| 2117 | |
| 2118 | pdev = to_pci_dev(dev); |
| 2119 | |
| 2120 | devid = calc_devid(pdev->bus->number, pdev->devfn); |
| 2121 | |
| 2122 | if (devid >= amd_iommu_last_bdf || |
| 2123 | devid != amd_iommu_alias_table[devid]) |
| 2124 | return -EINVAL; |
| 2125 | |
| 2126 | iommu = amd_iommu_rlookup_table[devid]; |
| 2127 | if (!iommu) |
| 2128 | return -EINVAL; |
| 2129 | |
| 2130 | old_domain = domain_for_device(devid); |
| 2131 | if (old_domain) |
Joerg Roedel | 71ff3bc | 2009-06-08 13:47:33 -0700 | [diff] [blame] | 2132 | detach_device(old_domain, devid); |
Joerg Roedel | 0110606 | 2008-12-02 19:34:11 +0100 | [diff] [blame] | 2133 | |
| 2134 | attach_device(iommu, domain, devid); |
| 2135 | |
| 2136 | iommu_completion_wait(iommu); |
| 2137 | |
| 2138 | return 0; |
| 2139 | } |
| 2140 | |
Joerg Roedel | c6229ca | 2008-12-02 19:48:43 +0100 | [diff] [blame] | 2141 | static int amd_iommu_map_range(struct iommu_domain *dom, |
| 2142 | unsigned long iova, phys_addr_t paddr, |
| 2143 | size_t size, int iommu_prot) |
| 2144 | { |
| 2145 | struct protection_domain *domain = dom->priv; |
| 2146 | unsigned long i, npages = iommu_num_pages(paddr, size, PAGE_SIZE); |
| 2147 | int prot = 0; |
| 2148 | int ret; |
| 2149 | |
| 2150 | if (iommu_prot & IOMMU_READ) |
| 2151 | prot |= IOMMU_PROT_IR; |
| 2152 | if (iommu_prot & IOMMU_WRITE) |
| 2153 | prot |= IOMMU_PROT_IW; |
| 2154 | |
| 2155 | iova &= PAGE_MASK; |
| 2156 | paddr &= PAGE_MASK; |
| 2157 | |
| 2158 | for (i = 0; i < npages; ++i) { |
| 2159 | ret = iommu_map_page(domain, iova, paddr, prot); |
| 2160 | if (ret) |
| 2161 | return ret; |
| 2162 | |
| 2163 | iova += PAGE_SIZE; |
| 2164 | paddr += PAGE_SIZE; |
| 2165 | } |
| 2166 | |
| 2167 | return 0; |
| 2168 | } |
| 2169 | |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 2170 | static void amd_iommu_unmap_range(struct iommu_domain *dom, |
| 2171 | unsigned long iova, size_t size) |
| 2172 | { |
| 2173 | |
| 2174 | struct protection_domain *domain = dom->priv; |
| 2175 | unsigned long i, npages = iommu_num_pages(iova, size, PAGE_SIZE); |
| 2176 | |
| 2177 | iova &= PAGE_MASK; |
| 2178 | |
| 2179 | for (i = 0; i < npages; ++i) { |
| 2180 | iommu_unmap_page(domain, iova); |
| 2181 | iova += PAGE_SIZE; |
| 2182 | } |
| 2183 | |
| 2184 | iommu_flush_domain(domain->id); |
| 2185 | } |
| 2186 | |
Joerg Roedel | 645c4c8 | 2008-12-02 20:05:50 +0100 | [diff] [blame] | 2187 | static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom, |
| 2188 | unsigned long iova) |
| 2189 | { |
| 2190 | struct protection_domain *domain = dom->priv; |
| 2191 | unsigned long offset = iova & ~PAGE_MASK; |
| 2192 | phys_addr_t paddr; |
| 2193 | u64 *pte; |
| 2194 | |
| 2195 | pte = &domain->pt_root[IOMMU_PTE_L2_INDEX(iova)]; |
| 2196 | |
| 2197 | if (!IOMMU_PTE_PRESENT(*pte)) |
| 2198 | return 0; |
| 2199 | |
| 2200 | pte = IOMMU_PTE_PAGE(*pte); |
| 2201 | pte = &pte[IOMMU_PTE_L1_INDEX(iova)]; |
| 2202 | |
| 2203 | if (!IOMMU_PTE_PRESENT(*pte)) |
| 2204 | return 0; |
| 2205 | |
| 2206 | pte = IOMMU_PTE_PAGE(*pte); |
| 2207 | pte = &pte[IOMMU_PTE_L0_INDEX(iova)]; |
| 2208 | |
| 2209 | if (!IOMMU_PTE_PRESENT(*pte)) |
| 2210 | return 0; |
| 2211 | |
| 2212 | paddr = *pte & IOMMU_PAGE_MASK; |
| 2213 | paddr |= offset; |
| 2214 | |
| 2215 | return paddr; |
| 2216 | } |
| 2217 | |
Sheng Yang | dbb9fd8 | 2009-03-18 15:33:06 +0800 | [diff] [blame] | 2218 | static int amd_iommu_domain_has_cap(struct iommu_domain *domain, |
| 2219 | unsigned long cap) |
| 2220 | { |
| 2221 | return 0; |
| 2222 | } |
| 2223 | |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 2224 | static struct iommu_ops amd_iommu_ops = { |
| 2225 | .domain_init = amd_iommu_domain_init, |
| 2226 | .domain_destroy = amd_iommu_domain_destroy, |
| 2227 | .attach_dev = amd_iommu_attach_device, |
| 2228 | .detach_dev = amd_iommu_detach_device, |
| 2229 | .map = amd_iommu_map_range, |
| 2230 | .unmap = amd_iommu_unmap_range, |
| 2231 | .iova_to_phys = amd_iommu_iova_to_phys, |
Sheng Yang | dbb9fd8 | 2009-03-18 15:33:06 +0800 | [diff] [blame] | 2232 | .domain_has_cap = amd_iommu_domain_has_cap, |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 2233 | }; |
| 2234 | |
Joerg Roedel | 0feae53 | 2009-08-26 15:26:30 +0200 | [diff] [blame^] | 2235 | /***************************************************************************** |
| 2236 | * |
| 2237 | * The next functions do a basic initialization of IOMMU for pass through |
| 2238 | * mode |
| 2239 | * |
| 2240 | * In passthrough mode the IOMMU is initialized and enabled but not used for |
| 2241 | * DMA-API translation. |
| 2242 | * |
| 2243 | *****************************************************************************/ |
| 2244 | |
| 2245 | int __init amd_iommu_init_passthrough(void) |
| 2246 | { |
| 2247 | struct pci_dev *dev = NULL; |
| 2248 | u16 devid, devid2; |
| 2249 | |
| 2250 | /* allocate passthroug domain */ |
| 2251 | pt_domain = protection_domain_alloc(); |
| 2252 | if (!pt_domain) |
| 2253 | return -ENOMEM; |
| 2254 | |
| 2255 | pt_domain->mode |= PAGE_MODE_NONE; |
| 2256 | |
| 2257 | while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { |
| 2258 | struct amd_iommu *iommu; |
| 2259 | |
| 2260 | devid = calc_devid(dev->bus->number, dev->devfn); |
| 2261 | if (devid > amd_iommu_last_bdf) |
| 2262 | continue; |
| 2263 | |
| 2264 | devid2 = amd_iommu_alias_table[devid]; |
| 2265 | |
| 2266 | iommu = amd_iommu_rlookup_table[devid2]; |
| 2267 | if (!iommu) |
| 2268 | continue; |
| 2269 | |
| 2270 | __attach_device(iommu, pt_domain, devid); |
| 2271 | __attach_device(iommu, pt_domain, devid2); |
| 2272 | } |
| 2273 | |
| 2274 | pr_info("AMD-Vi: Initialized for Passthrough Mode\n"); |
| 2275 | |
| 2276 | return 0; |
| 2277 | } |