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 | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 44 | #ifdef CONFIG_IOMMU_API |
| 45 | static struct iommu_ops amd_iommu_ops; |
| 46 | #endif |
| 47 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 48 | /* |
| 49 | * general struct to manage commands send to an IOMMU |
| 50 | */ |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 51 | struct iommu_cmd { |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 52 | u32 data[4]; |
| 53 | }; |
| 54 | |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 55 | static int dma_ops_unity_map(struct dma_ops_domain *dma_dom, |
| 56 | struct unity_map_entry *e); |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 57 | static struct dma_ops_domain *find_protection_domain(u16 devid); |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 58 | static u64 *alloc_pte(struct protection_domain *domain, |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame^] | 59 | unsigned long address, int end_lvl, |
| 60 | u64 **pte_page, gfp_t gfp); |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 61 | static void dma_ops_reserve_addresses(struct dma_ops_domain *dom, |
| 62 | unsigned long start_page, |
| 63 | unsigned int pages); |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 64 | static u64 *fetch_pte(struct protection_domain *domain, |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 65 | unsigned long address, int map_size); |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 66 | static void update_domain(struct protection_domain *domain); |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 67 | |
Chris Wright | c1eee67 | 2009-05-21 00:56:58 -0700 | [diff] [blame] | 68 | #ifndef BUS_NOTIFY_UNBOUND_DRIVER |
| 69 | #define BUS_NOTIFY_UNBOUND_DRIVER 0x0005 |
| 70 | #endif |
| 71 | |
Joerg Roedel | 7f26508 | 2008-12-12 13:50:21 +0100 | [diff] [blame] | 72 | #ifdef CONFIG_AMD_IOMMU_STATS |
| 73 | |
| 74 | /* |
| 75 | * Initialization code for statistics collection |
| 76 | */ |
| 77 | |
Joerg Roedel | da49f6d | 2008-12-12 14:59:58 +0100 | [diff] [blame] | 78 | DECLARE_STATS_COUNTER(compl_wait); |
Joerg Roedel | 0f2a86f | 2008-12-12 15:05:16 +0100 | [diff] [blame] | 79 | DECLARE_STATS_COUNTER(cnt_map_single); |
Joerg Roedel | 146a691 | 2008-12-12 15:07:12 +0100 | [diff] [blame] | 80 | DECLARE_STATS_COUNTER(cnt_unmap_single); |
Joerg Roedel | d03f067a | 2008-12-12 15:09:48 +0100 | [diff] [blame] | 81 | DECLARE_STATS_COUNTER(cnt_map_sg); |
Joerg Roedel | 55877a6 | 2008-12-12 15:12:14 +0100 | [diff] [blame] | 82 | DECLARE_STATS_COUNTER(cnt_unmap_sg); |
Joerg Roedel | c8f0fb3 | 2008-12-12 15:14:21 +0100 | [diff] [blame] | 83 | DECLARE_STATS_COUNTER(cnt_alloc_coherent); |
Joerg Roedel | 5d31ee7 | 2008-12-12 15:16:38 +0100 | [diff] [blame] | 84 | DECLARE_STATS_COUNTER(cnt_free_coherent); |
Joerg Roedel | c185897 | 2008-12-12 15:42:39 +0100 | [diff] [blame] | 85 | DECLARE_STATS_COUNTER(cross_page); |
Joerg Roedel | f57d98a | 2008-12-12 15:46:29 +0100 | [diff] [blame] | 86 | DECLARE_STATS_COUNTER(domain_flush_single); |
Joerg Roedel | 18811f5 | 2008-12-12 15:48:28 +0100 | [diff] [blame] | 87 | DECLARE_STATS_COUNTER(domain_flush_all); |
Joerg Roedel | 5774f7c | 2008-12-12 15:57:30 +0100 | [diff] [blame] | 88 | DECLARE_STATS_COUNTER(alloced_io_mem); |
Joerg Roedel | 8ecaf8f | 2008-12-12 16:13:04 +0100 | [diff] [blame] | 89 | DECLARE_STATS_COUNTER(total_map_requests); |
Joerg Roedel | da49f6d | 2008-12-12 14:59:58 +0100 | [diff] [blame] | 90 | |
Joerg Roedel | 7f26508 | 2008-12-12 13:50:21 +0100 | [diff] [blame] | 91 | static struct dentry *stats_dir; |
| 92 | static struct dentry *de_isolate; |
| 93 | static struct dentry *de_fflush; |
| 94 | |
| 95 | static void amd_iommu_stats_add(struct __iommu_counter *cnt) |
| 96 | { |
| 97 | if (stats_dir == NULL) |
| 98 | return; |
| 99 | |
| 100 | cnt->dent = debugfs_create_u64(cnt->name, 0444, stats_dir, |
| 101 | &cnt->value); |
| 102 | } |
| 103 | |
| 104 | static void amd_iommu_stats_init(void) |
| 105 | { |
| 106 | stats_dir = debugfs_create_dir("amd-iommu", NULL); |
| 107 | if (stats_dir == NULL) |
| 108 | return; |
| 109 | |
| 110 | de_isolate = debugfs_create_bool("isolation", 0444, stats_dir, |
| 111 | (u32 *)&amd_iommu_isolate); |
| 112 | |
| 113 | de_fflush = debugfs_create_bool("fullflush", 0444, stats_dir, |
| 114 | (u32 *)&amd_iommu_unmap_flush); |
Joerg Roedel | da49f6d | 2008-12-12 14:59:58 +0100 | [diff] [blame] | 115 | |
| 116 | amd_iommu_stats_add(&compl_wait); |
Joerg Roedel | 0f2a86f | 2008-12-12 15:05:16 +0100 | [diff] [blame] | 117 | amd_iommu_stats_add(&cnt_map_single); |
Joerg Roedel | 146a691 | 2008-12-12 15:07:12 +0100 | [diff] [blame] | 118 | amd_iommu_stats_add(&cnt_unmap_single); |
Joerg Roedel | d03f067a | 2008-12-12 15:09:48 +0100 | [diff] [blame] | 119 | amd_iommu_stats_add(&cnt_map_sg); |
Joerg Roedel | 55877a6 | 2008-12-12 15:12:14 +0100 | [diff] [blame] | 120 | amd_iommu_stats_add(&cnt_unmap_sg); |
Joerg Roedel | c8f0fb3 | 2008-12-12 15:14:21 +0100 | [diff] [blame] | 121 | amd_iommu_stats_add(&cnt_alloc_coherent); |
Joerg Roedel | 5d31ee7 | 2008-12-12 15:16:38 +0100 | [diff] [blame] | 122 | amd_iommu_stats_add(&cnt_free_coherent); |
Joerg Roedel | c185897 | 2008-12-12 15:42:39 +0100 | [diff] [blame] | 123 | amd_iommu_stats_add(&cross_page); |
Joerg Roedel | f57d98a | 2008-12-12 15:46:29 +0100 | [diff] [blame] | 124 | amd_iommu_stats_add(&domain_flush_single); |
Joerg Roedel | 18811f5 | 2008-12-12 15:48:28 +0100 | [diff] [blame] | 125 | amd_iommu_stats_add(&domain_flush_all); |
Joerg Roedel | 5774f7c | 2008-12-12 15:57:30 +0100 | [diff] [blame] | 126 | amd_iommu_stats_add(&alloced_io_mem); |
Joerg Roedel | 8ecaf8f | 2008-12-12 16:13:04 +0100 | [diff] [blame] | 127 | amd_iommu_stats_add(&total_map_requests); |
Joerg Roedel | 7f26508 | 2008-12-12 13:50:21 +0100 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | #endif |
| 131 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 132 | /* 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] | 133 | static int iommu_has_npcache(struct amd_iommu *iommu) |
| 134 | { |
Joerg Roedel | ae9b940 | 2008-10-30 17:43:57 +0100 | [diff] [blame] | 135 | return iommu->cap & (1UL << IOMMU_CAP_NPCACHE); |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 136 | } |
| 137 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 138 | /**************************************************************************** |
| 139 | * |
Joerg Roedel | a80dc3e | 2008-09-11 16:51:41 +0200 | [diff] [blame] | 140 | * Interrupt handling functions |
| 141 | * |
| 142 | ****************************************************************************/ |
| 143 | |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 144 | static void iommu_print_event(void *__evt) |
| 145 | { |
| 146 | u32 *event = __evt; |
| 147 | int type = (event[1] >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK; |
| 148 | int devid = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK; |
| 149 | int domid = (event[1] >> EVENT_DOMID_SHIFT) & EVENT_DOMID_MASK; |
| 150 | int flags = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK; |
| 151 | u64 address = (u64)(((u64)event[3]) << 32) | event[2]; |
| 152 | |
| 153 | printk(KERN_ERR "AMD IOMMU: Event logged ["); |
| 154 | |
| 155 | switch (type) { |
| 156 | case EVENT_TYPE_ILL_DEV: |
| 157 | printk("ILLEGAL_DEV_TABLE_ENTRY device=%02x:%02x.%x " |
| 158 | "address=0x%016llx flags=0x%04x]\n", |
| 159 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 160 | address, flags); |
| 161 | break; |
| 162 | case EVENT_TYPE_IO_FAULT: |
| 163 | printk("IO_PAGE_FAULT device=%02x:%02x.%x " |
| 164 | "domain=0x%04x address=0x%016llx flags=0x%04x]\n", |
| 165 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 166 | domid, address, flags); |
| 167 | break; |
| 168 | case EVENT_TYPE_DEV_TAB_ERR: |
| 169 | printk("DEV_TAB_HARDWARE_ERROR device=%02x:%02x.%x " |
| 170 | "address=0x%016llx flags=0x%04x]\n", |
| 171 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 172 | address, flags); |
| 173 | break; |
| 174 | case EVENT_TYPE_PAGE_TAB_ERR: |
| 175 | printk("PAGE_TAB_HARDWARE_ERROR device=%02x:%02x.%x " |
| 176 | "domain=0x%04x address=0x%016llx flags=0x%04x]\n", |
| 177 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 178 | domid, address, flags); |
| 179 | break; |
| 180 | case EVENT_TYPE_ILL_CMD: |
| 181 | printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address); |
| 182 | break; |
| 183 | case EVENT_TYPE_CMD_HARD_ERR: |
| 184 | printk("COMMAND_HARDWARE_ERROR address=0x%016llx " |
| 185 | "flags=0x%04x]\n", address, flags); |
| 186 | break; |
| 187 | case EVENT_TYPE_IOTLB_INV_TO: |
| 188 | printk("IOTLB_INV_TIMEOUT device=%02x:%02x.%x " |
| 189 | "address=0x%016llx]\n", |
| 190 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 191 | address); |
| 192 | break; |
| 193 | case EVENT_TYPE_INV_DEV_REQ: |
| 194 | printk("INVALID_DEVICE_REQUEST device=%02x:%02x.%x " |
| 195 | "address=0x%016llx flags=0x%04x]\n", |
| 196 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 197 | address, flags); |
| 198 | break; |
| 199 | default: |
| 200 | printk(KERN_ERR "UNKNOWN type=0x%02x]\n", type); |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | static void iommu_poll_events(struct amd_iommu *iommu) |
| 205 | { |
| 206 | u32 head, tail; |
| 207 | unsigned long flags; |
| 208 | |
| 209 | spin_lock_irqsave(&iommu->lock, flags); |
| 210 | |
| 211 | head = readl(iommu->mmio_base + MMIO_EVT_HEAD_OFFSET); |
| 212 | tail = readl(iommu->mmio_base + MMIO_EVT_TAIL_OFFSET); |
| 213 | |
| 214 | while (head != tail) { |
| 215 | iommu_print_event(iommu->evt_buf + head); |
| 216 | head = (head + EVENT_ENTRY_SIZE) % iommu->evt_buf_size; |
| 217 | } |
| 218 | |
| 219 | writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET); |
| 220 | |
| 221 | spin_unlock_irqrestore(&iommu->lock, flags); |
| 222 | } |
| 223 | |
Joerg Roedel | a80dc3e | 2008-09-11 16:51:41 +0200 | [diff] [blame] | 224 | irqreturn_t amd_iommu_int_handler(int irq, void *data) |
| 225 | { |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 226 | struct amd_iommu *iommu; |
| 227 | |
Joerg Roedel | 3bd2217 | 2009-05-04 15:06:20 +0200 | [diff] [blame] | 228 | for_each_iommu(iommu) |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 229 | iommu_poll_events(iommu); |
| 230 | |
| 231 | return IRQ_HANDLED; |
Joerg Roedel | a80dc3e | 2008-09-11 16:51:41 +0200 | [diff] [blame] | 232 | } |
| 233 | |
| 234 | /**************************************************************************** |
| 235 | * |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 236 | * IOMMU command queuing functions |
| 237 | * |
| 238 | ****************************************************************************/ |
| 239 | |
| 240 | /* |
| 241 | * Writes the command to the IOMMUs command buffer and informs the |
| 242 | * hardware about the new command. Must be called with iommu->lock held. |
| 243 | */ |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 244 | 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] | 245 | { |
| 246 | u32 tail, head; |
| 247 | u8 *target; |
| 248 | |
| 249 | tail = readl(iommu->mmio_base + MMIO_CMD_TAIL_OFFSET); |
Jiri Kosina | 8a7c5ef | 2008-08-19 02:13:55 +0200 | [diff] [blame] | 250 | target = iommu->cmd_buf + tail; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 251 | memcpy_toio(target, cmd, sizeof(*cmd)); |
| 252 | tail = (tail + sizeof(*cmd)) % iommu->cmd_buf_size; |
| 253 | head = readl(iommu->mmio_base + MMIO_CMD_HEAD_OFFSET); |
| 254 | if (tail == head) |
| 255 | return -ENOMEM; |
| 256 | writel(tail, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET); |
| 257 | |
| 258 | return 0; |
| 259 | } |
| 260 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 261 | /* |
| 262 | * General queuing function for commands. Takes iommu->lock and calls |
| 263 | * __iommu_queue_command(). |
| 264 | */ |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 265 | 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] | 266 | { |
| 267 | unsigned long flags; |
| 268 | int ret; |
| 269 | |
| 270 | spin_lock_irqsave(&iommu->lock, flags); |
| 271 | ret = __iommu_queue_command(iommu, cmd); |
Joerg Roedel | 09ee17e | 2008-12-03 12:19:27 +0100 | [diff] [blame] | 272 | if (!ret) |
Joerg Roedel | 0cfd7aa | 2008-12-10 19:58:00 +0100 | [diff] [blame] | 273 | iommu->need_sync = true; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 274 | spin_unlock_irqrestore(&iommu->lock, flags); |
| 275 | |
| 276 | return ret; |
| 277 | } |
| 278 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 279 | /* |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 280 | * This function waits until an IOMMU has completed a completion |
| 281 | * wait command |
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 | static void __iommu_wait_for_completion(struct amd_iommu *iommu) |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 284 | { |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 285 | int ready = 0; |
Joerg Roedel | 519c31b | 2008-08-14 19:55:15 +0200 | [diff] [blame] | 286 | unsigned status = 0; |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 287 | unsigned long i = 0; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 288 | |
Joerg Roedel | da49f6d | 2008-12-12 14:59:58 +0100 | [diff] [blame] | 289 | INC_STATS_COUNTER(compl_wait); |
| 290 | |
Joerg Roedel | 136f78a | 2008-07-11 17:14:27 +0200 | [diff] [blame] | 291 | while (!ready && (i < EXIT_LOOP_COUNT)) { |
| 292 | ++i; |
Joerg Roedel | 519c31b | 2008-08-14 19:55:15 +0200 | [diff] [blame] | 293 | /* wait for the bit to become one */ |
| 294 | status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET); |
| 295 | ready = status & MMIO_STATUS_COM_WAIT_INT_MASK; |
Joerg Roedel | 136f78a | 2008-07-11 17:14:27 +0200 | [diff] [blame] | 296 | } |
| 297 | |
Joerg Roedel | 519c31b | 2008-08-14 19:55:15 +0200 | [diff] [blame] | 298 | /* set bit back to zero */ |
| 299 | status &= ~MMIO_STATUS_COM_WAIT_INT_MASK; |
| 300 | writel(status, iommu->mmio_base + MMIO_STATUS_OFFSET); |
| 301 | |
Joerg Roedel | 84df817 | 2008-12-17 16:36:44 +0100 | [diff] [blame] | 302 | if (unlikely(i == EXIT_LOOP_COUNT)) |
| 303 | panic("AMD IOMMU: Completion wait loop failed\n"); |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 304 | } |
| 305 | |
| 306 | /* |
| 307 | * This function queues a completion wait command into the command |
| 308 | * buffer of an IOMMU |
| 309 | */ |
| 310 | static int __iommu_completion_wait(struct amd_iommu *iommu) |
| 311 | { |
| 312 | struct iommu_cmd cmd; |
| 313 | |
| 314 | memset(&cmd, 0, sizeof(cmd)); |
| 315 | cmd.data[0] = CMD_COMPL_WAIT_INT_MASK; |
| 316 | CMD_SET_TYPE(&cmd, CMD_COMPL_WAIT); |
| 317 | |
| 318 | return __iommu_queue_command(iommu, &cmd); |
| 319 | } |
| 320 | |
| 321 | /* |
| 322 | * This function is called whenever we need to ensure that the IOMMU has |
| 323 | * completed execution of all commands we sent. It sends a |
| 324 | * COMPLETION_WAIT command and waits for it to finish. The IOMMU informs |
| 325 | * us about that by writing a value to a physical address we pass with |
| 326 | * the command. |
| 327 | */ |
| 328 | static int iommu_completion_wait(struct amd_iommu *iommu) |
| 329 | { |
| 330 | int ret = 0; |
| 331 | unsigned long flags; |
| 332 | |
| 333 | spin_lock_irqsave(&iommu->lock, flags); |
| 334 | |
| 335 | if (!iommu->need_sync) |
| 336 | goto out; |
| 337 | |
| 338 | ret = __iommu_completion_wait(iommu); |
| 339 | |
Joerg Roedel | 0cfd7aa | 2008-12-10 19:58:00 +0100 | [diff] [blame] | 340 | iommu->need_sync = false; |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 341 | |
| 342 | if (ret) |
| 343 | goto out; |
| 344 | |
| 345 | __iommu_wait_for_completion(iommu); |
Joerg Roedel | 84df817 | 2008-12-17 16:36:44 +0100 | [diff] [blame] | 346 | |
Joerg Roedel | 7e4f88d | 2008-09-17 14:19:15 +0200 | [diff] [blame] | 347 | out: |
| 348 | spin_unlock_irqrestore(&iommu->lock, flags); |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 349 | |
| 350 | return 0; |
| 351 | } |
| 352 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 353 | /* |
| 354 | * Command send function for invalidating a device table entry |
| 355 | */ |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 356 | static int iommu_queue_inv_dev_entry(struct amd_iommu *iommu, u16 devid) |
| 357 | { |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 358 | struct iommu_cmd cmd; |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 359 | int ret; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 360 | |
| 361 | BUG_ON(iommu == NULL); |
| 362 | |
| 363 | memset(&cmd, 0, sizeof(cmd)); |
| 364 | CMD_SET_TYPE(&cmd, CMD_INV_DEV_ENTRY); |
| 365 | cmd.data[0] = devid; |
| 366 | |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 367 | ret = iommu_queue_command(iommu, &cmd); |
| 368 | |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 369 | return ret; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 370 | } |
| 371 | |
Joerg Roedel | 237b6f3 | 2008-12-02 20:54:37 +0100 | [diff] [blame] | 372 | static void __iommu_build_inv_iommu_pages(struct iommu_cmd *cmd, u64 address, |
| 373 | u16 domid, int pde, int s) |
| 374 | { |
| 375 | memset(cmd, 0, sizeof(*cmd)); |
| 376 | address &= PAGE_MASK; |
| 377 | CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES); |
| 378 | cmd->data[1] |= domid; |
| 379 | cmd->data[2] = lower_32_bits(address); |
| 380 | cmd->data[3] = upper_32_bits(address); |
| 381 | if (s) /* size bit - we flush more than one 4kb page */ |
| 382 | cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK; |
| 383 | if (pde) /* PDE bit - we wan't flush everything not only the PTEs */ |
| 384 | cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK; |
| 385 | } |
| 386 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 387 | /* |
| 388 | * Generic command send function for invalidaing TLB entries |
| 389 | */ |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 390 | static int iommu_queue_inv_iommu_pages(struct amd_iommu *iommu, |
| 391 | u64 address, u16 domid, int pde, int s) |
| 392 | { |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 393 | struct iommu_cmd cmd; |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 394 | int ret; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 395 | |
Joerg Roedel | 237b6f3 | 2008-12-02 20:54:37 +0100 | [diff] [blame] | 396 | __iommu_build_inv_iommu_pages(&cmd, address, domid, pde, s); |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 397 | |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 398 | ret = iommu_queue_command(iommu, &cmd); |
| 399 | |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 400 | return ret; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 401 | } |
| 402 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 403 | /* |
| 404 | * TLB invalidation function which is called from the mapping functions. |
| 405 | * It invalidates a single PTE if the range to flush is within a single |
| 406 | * page. Otherwise it flushes the whole TLB of the IOMMU. |
| 407 | */ |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 408 | static int iommu_flush_pages(struct amd_iommu *iommu, u16 domid, |
| 409 | u64 address, size_t size) |
| 410 | { |
Joerg Roedel | 999ba41 | 2008-07-03 19:35:08 +0200 | [diff] [blame] | 411 | int s = 0; |
Joerg Roedel | e3c449f | 2008-10-15 22:02:11 -0700 | [diff] [blame] | 412 | unsigned pages = iommu_num_pages(address, size, PAGE_SIZE); |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 413 | |
| 414 | address &= PAGE_MASK; |
| 415 | |
Joerg Roedel | 999ba41 | 2008-07-03 19:35:08 +0200 | [diff] [blame] | 416 | if (pages > 1) { |
| 417 | /* |
| 418 | * If we have to flush more than one page, flush all |
| 419 | * TLB entries for this domain |
| 420 | */ |
| 421 | address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS; |
| 422 | s = 1; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 423 | } |
| 424 | |
Joerg Roedel | 999ba41 | 2008-07-03 19:35:08 +0200 | [diff] [blame] | 425 | iommu_queue_inv_iommu_pages(iommu, address, domid, 0, s); |
| 426 | |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 427 | return 0; |
| 428 | } |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 429 | |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 430 | /* Flush the whole IO/TLB for a given protection domain */ |
| 431 | static void iommu_flush_tlb(struct amd_iommu *iommu, u16 domid) |
| 432 | { |
| 433 | u64 address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS; |
| 434 | |
Joerg Roedel | f57d98a | 2008-12-12 15:46:29 +0100 | [diff] [blame] | 435 | INC_STATS_COUNTER(domain_flush_single); |
| 436 | |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 437 | iommu_queue_inv_iommu_pages(iommu, address, domid, 0, 1); |
| 438 | } |
| 439 | |
Chris Wright | 42a49f9 | 2009-06-15 15:42:00 +0200 | [diff] [blame] | 440 | /* Flush the whole IO/TLB for a given protection domain - including PDE */ |
| 441 | static void iommu_flush_tlb_pde(struct amd_iommu *iommu, u16 domid) |
| 442 | { |
| 443 | u64 address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS; |
| 444 | |
| 445 | INC_STATS_COUNTER(domain_flush_single); |
| 446 | |
| 447 | iommu_queue_inv_iommu_pages(iommu, address, domid, 1, 1); |
| 448 | } |
| 449 | |
Joerg Roedel | 43f4960 | 2008-12-02 21:01:12 +0100 | [diff] [blame] | 450 | /* |
| 451 | * This function is used to flush the IO/TLB for a given protection domain |
| 452 | * on every IOMMU in the system |
| 453 | */ |
| 454 | static void iommu_flush_domain(u16 domid) |
| 455 | { |
| 456 | unsigned long flags; |
| 457 | struct amd_iommu *iommu; |
| 458 | struct iommu_cmd cmd; |
| 459 | |
Joerg Roedel | 18811f5 | 2008-12-12 15:48:28 +0100 | [diff] [blame] | 460 | INC_STATS_COUNTER(domain_flush_all); |
| 461 | |
Joerg Roedel | 43f4960 | 2008-12-02 21:01:12 +0100 | [diff] [blame] | 462 | __iommu_build_inv_iommu_pages(&cmd, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, |
| 463 | domid, 1, 1); |
| 464 | |
Joerg Roedel | 3bd2217 | 2009-05-04 15:06:20 +0200 | [diff] [blame] | 465 | for_each_iommu(iommu) { |
Joerg Roedel | 43f4960 | 2008-12-02 21:01:12 +0100 | [diff] [blame] | 466 | spin_lock_irqsave(&iommu->lock, flags); |
| 467 | __iommu_queue_command(iommu, &cmd); |
| 468 | __iommu_completion_wait(iommu); |
| 469 | __iommu_wait_for_completion(iommu); |
| 470 | spin_unlock_irqrestore(&iommu->lock, flags); |
| 471 | } |
| 472 | } |
Joerg Roedel | 43f4960 | 2008-12-02 21:01:12 +0100 | [diff] [blame] | 473 | |
Joerg Roedel | bfd1be1 | 2009-05-05 15:33:57 +0200 | [diff] [blame] | 474 | void amd_iommu_flush_all_domains(void) |
| 475 | { |
| 476 | int i; |
| 477 | |
| 478 | for (i = 1; i < MAX_DOMAIN_ID; ++i) { |
| 479 | if (!test_bit(i, amd_iommu_pd_alloc_bitmap)) |
| 480 | continue; |
| 481 | iommu_flush_domain(i); |
| 482 | } |
| 483 | } |
| 484 | |
Joerg Roedel | 6a0dbcb | 2009-09-02 15:41:59 +0200 | [diff] [blame] | 485 | static void flush_devices_by_domain(struct protection_domain *domain) |
Joerg Roedel | 7d7a110 | 2009-05-05 15:48:10 +0200 | [diff] [blame] | 486 | { |
| 487 | struct amd_iommu *iommu; |
| 488 | int i; |
| 489 | |
| 490 | for (i = 0; i <= amd_iommu_last_bdf; ++i) { |
Joerg Roedel | 6a0dbcb | 2009-09-02 15:41:59 +0200 | [diff] [blame] | 491 | if ((domain == NULL && amd_iommu_pd_table[i] == NULL) || |
| 492 | (amd_iommu_pd_table[i] != domain)) |
Joerg Roedel | 7d7a110 | 2009-05-05 15:48:10 +0200 | [diff] [blame] | 493 | continue; |
| 494 | |
| 495 | iommu = amd_iommu_rlookup_table[i]; |
| 496 | if (!iommu) |
| 497 | continue; |
| 498 | |
| 499 | iommu_queue_inv_dev_entry(iommu, i); |
| 500 | iommu_completion_wait(iommu); |
| 501 | } |
| 502 | } |
| 503 | |
Joerg Roedel | 6a0dbcb | 2009-09-02 15:41:59 +0200 | [diff] [blame] | 504 | void amd_iommu_flush_all_devices(void) |
| 505 | { |
| 506 | flush_devices_by_domain(NULL); |
| 507 | } |
| 508 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 509 | /**************************************************************************** |
| 510 | * |
| 511 | * The functions below are used the create the page table mappings for |
| 512 | * unity mapped regions. |
| 513 | * |
| 514 | ****************************************************************************/ |
| 515 | |
| 516 | /* |
| 517 | * Generic mapping functions. It maps a physical address into a DMA |
| 518 | * address space. It allocates the page table pages if necessary. |
| 519 | * In the future it can be extended to a generic mapping function |
| 520 | * supporting all features of AMD IOMMU page tables like level skipping |
| 521 | * and full 64 bit address spaces. |
| 522 | */ |
Joerg Roedel | 38e817f | 2008-12-02 17:27:52 +0100 | [diff] [blame] | 523 | static int iommu_map_page(struct protection_domain *dom, |
| 524 | unsigned long bus_addr, |
| 525 | unsigned long phys_addr, |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame^] | 526 | int prot, |
| 527 | int map_size) |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 528 | { |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 529 | u64 __pte, *pte; |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 530 | |
| 531 | bus_addr = PAGE_ALIGN(bus_addr); |
Joerg Roedel | bb9d4ff | 2008-12-04 15:59:48 +0100 | [diff] [blame] | 532 | phys_addr = PAGE_ALIGN(phys_addr); |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 533 | |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame^] | 534 | BUG_ON(!PM_ALIGNED(map_size, bus_addr)); |
| 535 | BUG_ON(!PM_ALIGNED(map_size, phys_addr)); |
| 536 | |
Joerg Roedel | bad1cac | 2009-09-02 16:52:23 +0200 | [diff] [blame] | 537 | if (!(prot & IOMMU_PROT_MASK)) |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 538 | return -EINVAL; |
| 539 | |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame^] | 540 | pte = alloc_pte(dom, bus_addr, map_size, NULL, GFP_KERNEL); |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 541 | |
| 542 | if (IOMMU_PTE_PRESENT(*pte)) |
| 543 | return -EBUSY; |
| 544 | |
| 545 | __pte = phys_addr | IOMMU_PTE_P; |
| 546 | if (prot & IOMMU_PROT_IR) |
| 547 | __pte |= IOMMU_PTE_IR; |
| 548 | if (prot & IOMMU_PROT_IW) |
| 549 | __pte |= IOMMU_PTE_IW; |
| 550 | |
| 551 | *pte = __pte; |
| 552 | |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 553 | update_domain(dom); |
| 554 | |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 555 | return 0; |
| 556 | } |
| 557 | |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 558 | static void iommu_unmap_page(struct protection_domain *dom, |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 559 | unsigned long bus_addr, int map_size) |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 560 | { |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 561 | u64 *pte = fetch_pte(dom, bus_addr, map_size); |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 562 | |
Joerg Roedel | 38a76ee | 2009-09-02 17:02:47 +0200 | [diff] [blame] | 563 | if (pte) |
| 564 | *pte = 0; |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 565 | } |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 566 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 567 | /* |
| 568 | * This function checks if a specific unity mapping entry is needed for |
| 569 | * this specific IOMMU. |
| 570 | */ |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 571 | static int iommu_for_unity_map(struct amd_iommu *iommu, |
| 572 | struct unity_map_entry *entry) |
| 573 | { |
| 574 | u16 bdf, i; |
| 575 | |
| 576 | for (i = entry->devid_start; i <= entry->devid_end; ++i) { |
| 577 | bdf = amd_iommu_alias_table[i]; |
| 578 | if (amd_iommu_rlookup_table[bdf] == iommu) |
| 579 | return 1; |
| 580 | } |
| 581 | |
| 582 | return 0; |
| 583 | } |
| 584 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 585 | /* |
| 586 | * Init the unity mappings for a specific IOMMU in the system |
| 587 | * |
| 588 | * Basically iterates over all unity mapping entries and applies them to |
| 589 | * the default domain DMA of that IOMMU if necessary. |
| 590 | */ |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 591 | static int iommu_init_unity_mappings(struct amd_iommu *iommu) |
| 592 | { |
| 593 | struct unity_map_entry *entry; |
| 594 | int ret; |
| 595 | |
| 596 | list_for_each_entry(entry, &amd_iommu_unity_map, list) { |
| 597 | if (!iommu_for_unity_map(iommu, entry)) |
| 598 | continue; |
| 599 | ret = dma_ops_unity_map(iommu->default_dom, entry); |
| 600 | if (ret) |
| 601 | return ret; |
| 602 | } |
| 603 | |
| 604 | return 0; |
| 605 | } |
| 606 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 607 | /* |
| 608 | * This function actually applies the mapping to the page table of the |
| 609 | * dma_ops domain. |
| 610 | */ |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 611 | static int dma_ops_unity_map(struct dma_ops_domain *dma_dom, |
| 612 | struct unity_map_entry *e) |
| 613 | { |
| 614 | u64 addr; |
| 615 | int ret; |
| 616 | |
| 617 | for (addr = e->address_start; addr < e->address_end; |
| 618 | addr += PAGE_SIZE) { |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame^] | 619 | ret = iommu_map_page(&dma_dom->domain, addr, addr, e->prot, |
| 620 | PM_MAP_4k); |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 621 | if (ret) |
| 622 | return ret; |
| 623 | /* |
| 624 | * if unity mapping is in aperture range mark the page |
| 625 | * as allocated in the aperture |
| 626 | */ |
| 627 | if (addr < dma_dom->aperture_size) |
Joerg Roedel | c323956 | 2009-05-12 10:56:44 +0200 | [diff] [blame] | 628 | __set_bit(addr >> PAGE_SHIFT, |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 629 | dma_dom->aperture[0]->bitmap); |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 630 | } |
| 631 | |
| 632 | return 0; |
| 633 | } |
| 634 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 635 | /* |
| 636 | * Inits the unity mappings required for a specific device |
| 637 | */ |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 638 | static int init_unity_mappings_for_device(struct dma_ops_domain *dma_dom, |
| 639 | u16 devid) |
| 640 | { |
| 641 | struct unity_map_entry *e; |
| 642 | int ret; |
| 643 | |
| 644 | list_for_each_entry(e, &amd_iommu_unity_map, list) { |
| 645 | if (!(devid >= e->devid_start && devid <= e->devid_end)) |
| 646 | continue; |
| 647 | ret = dma_ops_unity_map(dma_dom, e); |
| 648 | if (ret) |
| 649 | return ret; |
| 650 | } |
| 651 | |
| 652 | return 0; |
| 653 | } |
| 654 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 655 | /**************************************************************************** |
| 656 | * |
| 657 | * The next functions belong to the address allocator for the dma_ops |
| 658 | * interface functions. They work like the allocators in the other IOMMU |
| 659 | * drivers. Its basically a bitmap which marks the allocated pages in |
| 660 | * the aperture. Maybe it could be enhanced in the future to a more |
| 661 | * efficient allocator. |
| 662 | * |
| 663 | ****************************************************************************/ |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 664 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 665 | /* |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 666 | * The address allocator core functions. |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 667 | * |
| 668 | * called with domain->lock held |
| 669 | */ |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 670 | |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 671 | /* |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 672 | * This function checks if there is a PTE for a given dma address. If |
| 673 | * there is one, it returns the pointer to it. |
| 674 | */ |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 675 | static u64 *fetch_pte(struct protection_domain *domain, |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 676 | unsigned long address, int map_size) |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 677 | { |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 678 | int level; |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 679 | u64 *pte; |
| 680 | |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 681 | level = domain->mode - 1; |
| 682 | pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)]; |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 683 | |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 684 | while (level > map_size) { |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 685 | if (!IOMMU_PTE_PRESENT(*pte)) |
| 686 | return NULL; |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 687 | |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 688 | level -= 1; |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 689 | |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 690 | pte = IOMMU_PTE_PAGE(*pte); |
| 691 | pte = &pte[PM_LEVEL_INDEX(level, address)]; |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 692 | |
| 693 | if ((PM_PTE_LEVEL(*pte) == 0) && level != map_size) { |
| 694 | pte = NULL; |
| 695 | break; |
| 696 | } |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 697 | } |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 698 | |
| 699 | return pte; |
| 700 | } |
| 701 | |
| 702 | /* |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 703 | * This function is used to add a new aperture range to an existing |
| 704 | * aperture in case of dma_ops domain allocation or address allocation |
| 705 | * failure. |
| 706 | */ |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 707 | static int alloc_new_range(struct amd_iommu *iommu, |
| 708 | struct dma_ops_domain *dma_dom, |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 709 | bool populate, gfp_t gfp) |
| 710 | { |
| 711 | int index = dma_dom->aperture_size >> APERTURE_RANGE_SHIFT; |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 712 | int i; |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 713 | |
Joerg Roedel | f5e9705 | 2009-05-22 12:31:53 +0200 | [diff] [blame] | 714 | #ifdef CONFIG_IOMMU_STRESS |
| 715 | populate = false; |
| 716 | #endif |
| 717 | |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 718 | if (index >= APERTURE_MAX_RANGES) |
| 719 | return -ENOMEM; |
| 720 | |
| 721 | dma_dom->aperture[index] = kzalloc(sizeof(struct aperture_range), gfp); |
| 722 | if (!dma_dom->aperture[index]) |
| 723 | return -ENOMEM; |
| 724 | |
| 725 | dma_dom->aperture[index]->bitmap = (void *)get_zeroed_page(gfp); |
| 726 | if (!dma_dom->aperture[index]->bitmap) |
| 727 | goto out_free; |
| 728 | |
| 729 | dma_dom->aperture[index]->offset = dma_dom->aperture_size; |
| 730 | |
| 731 | if (populate) { |
| 732 | unsigned long address = dma_dom->aperture_size; |
| 733 | int i, num_ptes = APERTURE_RANGE_PAGES / 512; |
| 734 | u64 *pte, *pte_page; |
| 735 | |
| 736 | for (i = 0; i < num_ptes; ++i) { |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame^] | 737 | pte = alloc_pte(&dma_dom->domain, address, PM_MAP_4k, |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 738 | &pte_page, gfp); |
| 739 | if (!pte) |
| 740 | goto out_free; |
| 741 | |
| 742 | dma_dom->aperture[index]->pte_pages[i] = pte_page; |
| 743 | |
| 744 | address += APERTURE_RANGE_SIZE / 64; |
| 745 | } |
| 746 | } |
| 747 | |
| 748 | dma_dom->aperture_size += APERTURE_RANGE_SIZE; |
| 749 | |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 750 | /* Intialize the exclusion range if necessary */ |
| 751 | if (iommu->exclusion_start && |
| 752 | iommu->exclusion_start >= dma_dom->aperture[index]->offset && |
| 753 | iommu->exclusion_start < dma_dom->aperture_size) { |
| 754 | unsigned long startpage = iommu->exclusion_start >> PAGE_SHIFT; |
| 755 | int pages = iommu_num_pages(iommu->exclusion_start, |
| 756 | iommu->exclusion_length, |
| 757 | PAGE_SIZE); |
| 758 | dma_ops_reserve_addresses(dma_dom, startpage, pages); |
| 759 | } |
| 760 | |
| 761 | /* |
| 762 | * Check for areas already mapped as present in the new aperture |
| 763 | * range and mark those pages as reserved in the allocator. Such |
| 764 | * mappings may already exist as a result of requested unity |
| 765 | * mappings for devices. |
| 766 | */ |
| 767 | for (i = dma_dom->aperture[index]->offset; |
| 768 | i < dma_dom->aperture_size; |
| 769 | i += PAGE_SIZE) { |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 770 | u64 *pte = fetch_pte(&dma_dom->domain, i, PM_MAP_4k); |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 771 | if (!pte || !IOMMU_PTE_PRESENT(*pte)) |
| 772 | continue; |
| 773 | |
| 774 | dma_ops_reserve_addresses(dma_dom, i << PAGE_SHIFT, 1); |
| 775 | } |
| 776 | |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 777 | update_domain(&dma_dom->domain); |
| 778 | |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 779 | return 0; |
| 780 | |
| 781 | out_free: |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 782 | update_domain(&dma_dom->domain); |
| 783 | |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 784 | free_page((unsigned long)dma_dom->aperture[index]->bitmap); |
| 785 | |
| 786 | kfree(dma_dom->aperture[index]); |
| 787 | dma_dom->aperture[index] = NULL; |
| 788 | |
| 789 | return -ENOMEM; |
| 790 | } |
| 791 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 792 | static unsigned long dma_ops_area_alloc(struct device *dev, |
| 793 | struct dma_ops_domain *dom, |
| 794 | unsigned int pages, |
| 795 | unsigned long align_mask, |
| 796 | u64 dma_mask, |
| 797 | unsigned long start) |
| 798 | { |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 799 | unsigned long next_bit = dom->next_address % APERTURE_RANGE_SIZE; |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 800 | int max_index = dom->aperture_size >> APERTURE_RANGE_SHIFT; |
| 801 | int i = start >> APERTURE_RANGE_SHIFT; |
| 802 | unsigned long boundary_size; |
| 803 | unsigned long address = -1; |
| 804 | unsigned long limit; |
| 805 | |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 806 | next_bit >>= PAGE_SHIFT; |
| 807 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 808 | boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1, |
| 809 | PAGE_SIZE) >> PAGE_SHIFT; |
| 810 | |
| 811 | for (;i < max_index; ++i) { |
| 812 | unsigned long offset = dom->aperture[i]->offset >> PAGE_SHIFT; |
| 813 | |
| 814 | if (dom->aperture[i]->offset >= dma_mask) |
| 815 | break; |
| 816 | |
| 817 | limit = iommu_device_max_index(APERTURE_RANGE_PAGES, offset, |
| 818 | dma_mask >> PAGE_SHIFT); |
| 819 | |
| 820 | address = iommu_area_alloc(dom->aperture[i]->bitmap, |
| 821 | limit, next_bit, pages, 0, |
| 822 | boundary_size, align_mask); |
| 823 | if (address != -1) { |
| 824 | address = dom->aperture[i]->offset + |
| 825 | (address << PAGE_SHIFT); |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 826 | dom->next_address = address + (pages << PAGE_SHIFT); |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 827 | break; |
| 828 | } |
| 829 | |
| 830 | next_bit = 0; |
| 831 | } |
| 832 | |
| 833 | return address; |
| 834 | } |
| 835 | |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 836 | static unsigned long dma_ops_alloc_addresses(struct device *dev, |
| 837 | struct dma_ops_domain *dom, |
Joerg Roedel | 6d4f343 | 2008-09-04 19:18:02 +0200 | [diff] [blame] | 838 | unsigned int pages, |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 839 | unsigned long align_mask, |
| 840 | u64 dma_mask) |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 841 | { |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 842 | unsigned long address; |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 843 | |
Joerg Roedel | fe16f08 | 2009-05-22 12:27:53 +0200 | [diff] [blame] | 844 | #ifdef CONFIG_IOMMU_STRESS |
| 845 | dom->next_address = 0; |
| 846 | dom->need_flush = true; |
| 847 | #endif |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 848 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 849 | address = dma_ops_area_alloc(dev, dom, pages, align_mask, |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 850 | dma_mask, dom->next_address); |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 851 | |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 852 | if (address == -1) { |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 853 | dom->next_address = 0; |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 854 | address = dma_ops_area_alloc(dev, dom, pages, align_mask, |
| 855 | dma_mask, 0); |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 856 | dom->need_flush = true; |
| 857 | } |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 858 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 859 | if (unlikely(address == -1)) |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 860 | address = bad_dma_address; |
| 861 | |
| 862 | WARN_ON((address + (PAGE_SIZE*pages)) > dom->aperture_size); |
| 863 | |
| 864 | return address; |
| 865 | } |
| 866 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 867 | /* |
| 868 | * The address free function. |
| 869 | * |
| 870 | * called with domain->lock held |
| 871 | */ |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 872 | static void dma_ops_free_addresses(struct dma_ops_domain *dom, |
| 873 | unsigned long address, |
| 874 | unsigned int pages) |
| 875 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 876 | unsigned i = address >> APERTURE_RANGE_SHIFT; |
| 877 | struct aperture_range *range = dom->aperture[i]; |
Joerg Roedel | 80be308 | 2008-11-06 14:59:05 +0100 | [diff] [blame] | 878 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 879 | BUG_ON(i >= APERTURE_MAX_RANGES || range == NULL); |
| 880 | |
Joerg Roedel | 47bccd6 | 2009-05-22 12:40:54 +0200 | [diff] [blame] | 881 | #ifdef CONFIG_IOMMU_STRESS |
| 882 | if (i < 4) |
| 883 | return; |
| 884 | #endif |
| 885 | |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 886 | if (address >= dom->next_address) |
Joerg Roedel | 80be308 | 2008-11-06 14:59:05 +0100 | [diff] [blame] | 887 | dom->need_flush = true; |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 888 | |
| 889 | address = (address % APERTURE_RANGE_SIZE) >> PAGE_SHIFT; |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 890 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 891 | iommu_area_free(range->bitmap, address, pages); |
| 892 | |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 893 | } |
| 894 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 895 | /**************************************************************************** |
| 896 | * |
| 897 | * The next functions belong to the domain allocation. A domain is |
| 898 | * allocated for every IOMMU as the default domain. If device isolation |
| 899 | * is enabled, every device get its own domain. The most important thing |
| 900 | * about domains is the page table mapping the DMA address space they |
| 901 | * contain. |
| 902 | * |
| 903 | ****************************************************************************/ |
| 904 | |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 905 | static u16 domain_id_alloc(void) |
| 906 | { |
| 907 | unsigned long flags; |
| 908 | int id; |
| 909 | |
| 910 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 911 | id = find_first_zero_bit(amd_iommu_pd_alloc_bitmap, MAX_DOMAIN_ID); |
| 912 | BUG_ON(id == 0); |
| 913 | if (id > 0 && id < MAX_DOMAIN_ID) |
| 914 | __set_bit(id, amd_iommu_pd_alloc_bitmap); |
| 915 | else |
| 916 | id = 0; |
| 917 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 918 | |
| 919 | return id; |
| 920 | } |
| 921 | |
Joerg Roedel | a2acfb7 | 2008-12-02 18:28:53 +0100 | [diff] [blame] | 922 | static void domain_id_free(int id) |
| 923 | { |
| 924 | unsigned long flags; |
| 925 | |
| 926 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 927 | if (id > 0 && id < MAX_DOMAIN_ID) |
| 928 | __clear_bit(id, amd_iommu_pd_alloc_bitmap); |
| 929 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 930 | } |
Joerg Roedel | a2acfb7 | 2008-12-02 18:28:53 +0100 | [diff] [blame] | 931 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 932 | /* |
| 933 | * Used to reserve address ranges in the aperture (e.g. for exclusion |
| 934 | * ranges. |
| 935 | */ |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 936 | static void dma_ops_reserve_addresses(struct dma_ops_domain *dom, |
| 937 | unsigned long start_page, |
| 938 | unsigned int pages) |
| 939 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 940 | unsigned int i, last_page = dom->aperture_size >> PAGE_SHIFT; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 941 | |
| 942 | if (start_page + pages > last_page) |
| 943 | pages = last_page - start_page; |
| 944 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 945 | for (i = start_page; i < start_page + pages; ++i) { |
| 946 | int index = i / APERTURE_RANGE_PAGES; |
| 947 | int page = i % APERTURE_RANGE_PAGES; |
| 948 | __set_bit(page, dom->aperture[index]->bitmap); |
| 949 | } |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 950 | } |
| 951 | |
Joerg Roedel | 86db2e5 | 2008-12-02 18:20:21 +0100 | [diff] [blame] | 952 | static void free_pagetable(struct protection_domain *domain) |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 953 | { |
| 954 | int i, j; |
| 955 | u64 *p1, *p2, *p3; |
| 956 | |
Joerg Roedel | 86db2e5 | 2008-12-02 18:20:21 +0100 | [diff] [blame] | 957 | p1 = domain->pt_root; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 958 | |
| 959 | if (!p1) |
| 960 | return; |
| 961 | |
| 962 | for (i = 0; i < 512; ++i) { |
| 963 | if (!IOMMU_PTE_PRESENT(p1[i])) |
| 964 | continue; |
| 965 | |
| 966 | p2 = IOMMU_PTE_PAGE(p1[i]); |
Joerg Roedel | 3cc3d84 | 2008-12-04 16:44:31 +0100 | [diff] [blame] | 967 | for (j = 0; j < 512; ++j) { |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 968 | if (!IOMMU_PTE_PRESENT(p2[j])) |
| 969 | continue; |
| 970 | p3 = IOMMU_PTE_PAGE(p2[j]); |
| 971 | free_page((unsigned long)p3); |
| 972 | } |
| 973 | |
| 974 | free_page((unsigned long)p2); |
| 975 | } |
| 976 | |
| 977 | free_page((unsigned long)p1); |
Joerg Roedel | 86db2e5 | 2008-12-02 18:20:21 +0100 | [diff] [blame] | 978 | |
| 979 | domain->pt_root = NULL; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 980 | } |
| 981 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 982 | /* |
| 983 | * Free a domain, only used if something went wrong in the |
| 984 | * allocation path and we need to free an already allocated page table |
| 985 | */ |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 986 | static void dma_ops_domain_free(struct dma_ops_domain *dom) |
| 987 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 988 | int i; |
| 989 | |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 990 | if (!dom) |
| 991 | return; |
| 992 | |
Joerg Roedel | 86db2e5 | 2008-12-02 18:20:21 +0100 | [diff] [blame] | 993 | free_pagetable(&dom->domain); |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 994 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 995 | for (i = 0; i < APERTURE_MAX_RANGES; ++i) { |
| 996 | if (!dom->aperture[i]) |
| 997 | continue; |
| 998 | free_page((unsigned long)dom->aperture[i]->bitmap); |
| 999 | kfree(dom->aperture[i]); |
| 1000 | } |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1001 | |
| 1002 | kfree(dom); |
| 1003 | } |
| 1004 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1005 | /* |
| 1006 | * Allocates a new protection domain usable for the dma_ops functions. |
| 1007 | * It also intializes the page table and the address allocator data |
| 1008 | * structures required for the dma_ops interface |
| 1009 | */ |
Joerg Roedel | d9cfed9 | 2009-05-19 12:16:29 +0200 | [diff] [blame] | 1010 | 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] | 1011 | { |
| 1012 | struct dma_ops_domain *dma_dom; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1013 | |
| 1014 | dma_dom = kzalloc(sizeof(struct dma_ops_domain), GFP_KERNEL); |
| 1015 | if (!dma_dom) |
| 1016 | return NULL; |
| 1017 | |
| 1018 | spin_lock_init(&dma_dom->domain.lock); |
| 1019 | |
| 1020 | dma_dom->domain.id = domain_id_alloc(); |
| 1021 | if (dma_dom->domain.id == 0) |
| 1022 | goto free_dma_dom; |
Joerg Roedel | 8f7a017 | 2009-09-02 16:55:24 +0200 | [diff] [blame] | 1023 | dma_dom->domain.mode = PAGE_MODE_2_LEVEL; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1024 | dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL); |
Joerg Roedel | 9fdb19d | 2008-12-02 17:46:25 +0100 | [diff] [blame] | 1025 | dma_dom->domain.flags = PD_DMA_OPS_MASK; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1026 | dma_dom->domain.priv = dma_dom; |
| 1027 | if (!dma_dom->domain.pt_root) |
| 1028 | goto free_dma_dom; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1029 | |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 1030 | dma_dom->need_flush = false; |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 1031 | dma_dom->target_dev = 0xffff; |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 1032 | |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 1033 | if (alloc_new_range(iommu, dma_dom, true, GFP_KERNEL)) |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1034 | goto free_dma_dom; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1035 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1036 | /* |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1037 | * mark the first page as allocated so we never return 0 as |
| 1038 | * a valid dma-address. So we can use 0 as error value |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1039 | */ |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1040 | dma_dom->aperture[0]->bitmap[0] = 1; |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 1041 | dma_dom->next_address = 0; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1042 | |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1043 | |
| 1044 | return dma_dom; |
| 1045 | |
| 1046 | free_dma_dom: |
| 1047 | dma_ops_domain_free(dma_dom); |
| 1048 | |
| 1049 | return NULL; |
| 1050 | } |
| 1051 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1052 | /* |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1053 | * little helper function to check whether a given protection domain is a |
| 1054 | * dma_ops domain |
| 1055 | */ |
| 1056 | static bool dma_ops_domain(struct protection_domain *domain) |
| 1057 | { |
| 1058 | return domain->flags & PD_DMA_OPS_MASK; |
| 1059 | } |
| 1060 | |
| 1061 | /* |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1062 | * Find out the protection domain structure for a given PCI device. This |
| 1063 | * will give us the pointer to the page table root for example. |
| 1064 | */ |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1065 | static struct protection_domain *domain_for_device(u16 devid) |
| 1066 | { |
| 1067 | struct protection_domain *dom; |
| 1068 | unsigned long flags; |
| 1069 | |
| 1070 | read_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 1071 | dom = amd_iommu_pd_table[devid]; |
| 1072 | read_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 1073 | |
| 1074 | return dom; |
| 1075 | } |
| 1076 | |
Joerg Roedel | 407d733 | 2009-09-02 16:07:00 +0200 | [diff] [blame] | 1077 | static void set_dte_entry(u16 devid, struct protection_domain *domain) |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1078 | { |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1079 | u64 pte_root = virt_to_phys(domain->pt_root); |
Joerg Roedel | 407d733 | 2009-09-02 16:07:00 +0200 | [diff] [blame] | 1080 | unsigned long flags; |
Joerg Roedel | 863c74e | 2008-12-02 17:56:36 +0100 | [diff] [blame] | 1081 | |
Joerg Roedel | 38ddf41 | 2008-09-11 10:38:32 +0200 | [diff] [blame] | 1082 | pte_root |= (domain->mode & DEV_ENTRY_MODE_MASK) |
| 1083 | << DEV_ENTRY_MODE_SHIFT; |
| 1084 | 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] | 1085 | |
| 1086 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
Joerg Roedel | 38ddf41 | 2008-09-11 10:38:32 +0200 | [diff] [blame] | 1087 | amd_iommu_dev_table[devid].data[0] = lower_32_bits(pte_root); |
| 1088 | amd_iommu_dev_table[devid].data[1] = upper_32_bits(pte_root); |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1089 | amd_iommu_dev_table[devid].data[2] = domain->id; |
| 1090 | |
| 1091 | amd_iommu_pd_table[devid] = domain; |
| 1092 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
Joerg Roedel | 407d733 | 2009-09-02 16:07:00 +0200 | [diff] [blame] | 1093 | } |
| 1094 | |
| 1095 | /* |
| 1096 | * If a device is not yet associated with a domain, this function does |
| 1097 | * assigns it visible for the hardware |
| 1098 | */ |
| 1099 | static void attach_device(struct amd_iommu *iommu, |
| 1100 | struct protection_domain *domain, |
| 1101 | u16 devid) |
| 1102 | { |
| 1103 | /* set the DTE entry */ |
| 1104 | set_dte_entry(devid, domain); |
| 1105 | |
| 1106 | /* increase reference counter */ |
| 1107 | domain->dev_cnt += 1; |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1108 | |
Chris Wright | 42a49f9 | 2009-06-15 15:42:00 +0200 | [diff] [blame] | 1109 | /* |
| 1110 | * We might boot into a crash-kernel here. The crashed kernel |
| 1111 | * left the caches in the IOMMU dirty. So we have to flush |
| 1112 | * here to evict all dirty stuff. |
| 1113 | */ |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1114 | iommu_queue_inv_dev_entry(iommu, devid); |
Chris Wright | 42a49f9 | 2009-06-15 15:42:00 +0200 | [diff] [blame] | 1115 | iommu_flush_tlb_pde(iommu, domain->id); |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1116 | } |
| 1117 | |
Joerg Roedel | 355bf55 | 2008-12-08 12:02:41 +0100 | [diff] [blame] | 1118 | /* |
| 1119 | * Removes a device from a protection domain (unlocked) |
| 1120 | */ |
| 1121 | static void __detach_device(struct protection_domain *domain, u16 devid) |
| 1122 | { |
| 1123 | |
| 1124 | /* lock domain */ |
| 1125 | spin_lock(&domain->lock); |
| 1126 | |
| 1127 | /* remove domain from the lookup table */ |
| 1128 | amd_iommu_pd_table[devid] = NULL; |
| 1129 | |
| 1130 | /* remove entry from the device table seen by the hardware */ |
| 1131 | amd_iommu_dev_table[devid].data[0] = IOMMU_PTE_P | IOMMU_PTE_TV; |
| 1132 | amd_iommu_dev_table[devid].data[1] = 0; |
| 1133 | amd_iommu_dev_table[devid].data[2] = 0; |
| 1134 | |
| 1135 | /* decrease reference counter */ |
| 1136 | domain->dev_cnt -= 1; |
| 1137 | |
| 1138 | /* ready */ |
| 1139 | spin_unlock(&domain->lock); |
| 1140 | } |
| 1141 | |
| 1142 | /* |
| 1143 | * Removes a device from a protection domain (with devtable_lock held) |
| 1144 | */ |
| 1145 | static void detach_device(struct protection_domain *domain, u16 devid) |
| 1146 | { |
| 1147 | unsigned long flags; |
| 1148 | |
| 1149 | /* lock device table */ |
| 1150 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 1151 | __detach_device(domain, devid); |
| 1152 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 1153 | } |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1154 | |
| 1155 | static int device_change_notifier(struct notifier_block *nb, |
| 1156 | unsigned long action, void *data) |
| 1157 | { |
| 1158 | struct device *dev = data; |
| 1159 | struct pci_dev *pdev = to_pci_dev(dev); |
| 1160 | u16 devid = calc_devid(pdev->bus->number, pdev->devfn); |
| 1161 | struct protection_domain *domain; |
| 1162 | struct dma_ops_domain *dma_domain; |
| 1163 | struct amd_iommu *iommu; |
Joerg Roedel | 1ac4cbb | 2008-12-10 19:33:26 +0100 | [diff] [blame] | 1164 | unsigned long flags; |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1165 | |
| 1166 | if (devid > amd_iommu_last_bdf) |
| 1167 | goto out; |
| 1168 | |
| 1169 | devid = amd_iommu_alias_table[devid]; |
| 1170 | |
| 1171 | iommu = amd_iommu_rlookup_table[devid]; |
| 1172 | if (iommu == NULL) |
| 1173 | goto out; |
| 1174 | |
| 1175 | domain = domain_for_device(devid); |
| 1176 | |
| 1177 | if (domain && !dma_ops_domain(domain)) |
| 1178 | WARN_ONCE(1, "AMD IOMMU WARNING: device %s already bound " |
| 1179 | "to a non-dma-ops domain\n", dev_name(dev)); |
| 1180 | |
| 1181 | switch (action) { |
Chris Wright | c1eee67 | 2009-05-21 00:56:58 -0700 | [diff] [blame] | 1182 | case BUS_NOTIFY_UNBOUND_DRIVER: |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1183 | if (!domain) |
| 1184 | goto out; |
| 1185 | detach_device(domain, devid); |
| 1186 | break; |
Joerg Roedel | 1ac4cbb | 2008-12-10 19:33:26 +0100 | [diff] [blame] | 1187 | case BUS_NOTIFY_ADD_DEVICE: |
| 1188 | /* allocate a protection domain if a device is added */ |
| 1189 | dma_domain = find_protection_domain(devid); |
| 1190 | if (dma_domain) |
| 1191 | goto out; |
Joerg Roedel | d9cfed9 | 2009-05-19 12:16:29 +0200 | [diff] [blame] | 1192 | dma_domain = dma_ops_domain_alloc(iommu); |
Joerg Roedel | 1ac4cbb | 2008-12-10 19:33:26 +0100 | [diff] [blame] | 1193 | if (!dma_domain) |
| 1194 | goto out; |
| 1195 | dma_domain->target_dev = devid; |
| 1196 | |
| 1197 | spin_lock_irqsave(&iommu_pd_list_lock, flags); |
| 1198 | list_add_tail(&dma_domain->list, &iommu_pd_list); |
| 1199 | spin_unlock_irqrestore(&iommu_pd_list_lock, flags); |
| 1200 | |
| 1201 | break; |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1202 | default: |
| 1203 | goto out; |
| 1204 | } |
| 1205 | |
| 1206 | iommu_queue_inv_dev_entry(iommu, devid); |
| 1207 | iommu_completion_wait(iommu); |
| 1208 | |
| 1209 | out: |
| 1210 | return 0; |
| 1211 | } |
| 1212 | |
Jaswinder Singh Rajput | b25ae67 | 2009-07-01 19:53:14 +0530 | [diff] [blame] | 1213 | static struct notifier_block device_nb = { |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1214 | .notifier_call = device_change_notifier, |
| 1215 | }; |
Joerg Roedel | 355bf55 | 2008-12-08 12:02:41 +0100 | [diff] [blame] | 1216 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1217 | /***************************************************************************** |
| 1218 | * |
| 1219 | * The next functions belong to the dma_ops mapping/unmapping code. |
| 1220 | * |
| 1221 | *****************************************************************************/ |
| 1222 | |
| 1223 | /* |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1224 | * This function checks if the driver got a valid device from the caller to |
| 1225 | * avoid dereferencing invalid pointers. |
| 1226 | */ |
| 1227 | static bool check_device(struct device *dev) |
| 1228 | { |
| 1229 | if (!dev || !dev->dma_mask) |
| 1230 | return false; |
| 1231 | |
| 1232 | return true; |
| 1233 | } |
| 1234 | |
| 1235 | /* |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 1236 | * In this function the list of preallocated protection domains is traversed to |
| 1237 | * find the domain for a specific device |
| 1238 | */ |
| 1239 | static struct dma_ops_domain *find_protection_domain(u16 devid) |
| 1240 | { |
| 1241 | struct dma_ops_domain *entry, *ret = NULL; |
| 1242 | unsigned long flags; |
| 1243 | |
| 1244 | if (list_empty(&iommu_pd_list)) |
| 1245 | return NULL; |
| 1246 | |
| 1247 | spin_lock_irqsave(&iommu_pd_list_lock, flags); |
| 1248 | |
| 1249 | list_for_each_entry(entry, &iommu_pd_list, list) { |
| 1250 | if (entry->target_dev == devid) { |
| 1251 | ret = entry; |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 1252 | break; |
| 1253 | } |
| 1254 | } |
| 1255 | |
| 1256 | spin_unlock_irqrestore(&iommu_pd_list_lock, flags); |
| 1257 | |
| 1258 | return ret; |
| 1259 | } |
| 1260 | |
| 1261 | /* |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1262 | * In the dma_ops path we only have the struct device. This function |
| 1263 | * finds the corresponding IOMMU, the protection domain and the |
| 1264 | * requestor id for a given device. |
| 1265 | * If the device is not yet associated with a domain this is also done |
| 1266 | * in this function. |
| 1267 | */ |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1268 | static int get_device_resources(struct device *dev, |
| 1269 | struct amd_iommu **iommu, |
| 1270 | struct protection_domain **domain, |
| 1271 | u16 *bdf) |
| 1272 | { |
| 1273 | struct dma_ops_domain *dma_dom; |
| 1274 | struct pci_dev *pcidev; |
| 1275 | u16 _bdf; |
| 1276 | |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1277 | *iommu = NULL; |
| 1278 | *domain = NULL; |
| 1279 | *bdf = 0xffff; |
| 1280 | |
| 1281 | if (dev->bus != &pci_bus_type) |
| 1282 | return 0; |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1283 | |
| 1284 | pcidev = to_pci_dev(dev); |
Joerg Roedel | d591b0a | 2008-07-11 17:14:35 +0200 | [diff] [blame] | 1285 | _bdf = calc_devid(pcidev->bus->number, pcidev->devfn); |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1286 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1287 | /* device not translated by any IOMMU in the system? */ |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1288 | if (_bdf > amd_iommu_last_bdf) |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1289 | return 0; |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1290 | |
| 1291 | *bdf = amd_iommu_alias_table[_bdf]; |
| 1292 | |
| 1293 | *iommu = amd_iommu_rlookup_table[*bdf]; |
| 1294 | if (*iommu == NULL) |
| 1295 | return 0; |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1296 | *domain = domain_for_device(*bdf); |
| 1297 | if (*domain == NULL) { |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 1298 | dma_dom = find_protection_domain(*bdf); |
| 1299 | if (!dma_dom) |
| 1300 | dma_dom = (*iommu)->default_dom; |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1301 | *domain = &dma_dom->domain; |
Joerg Roedel | f1179dc | 2008-12-10 14:39:51 +0100 | [diff] [blame] | 1302 | attach_device(*iommu, *domain, *bdf); |
Joerg Roedel | e9a22a1 | 2009-06-09 12:00:37 +0200 | [diff] [blame] | 1303 | DUMP_printk("Using protection domain %d for device %s\n", |
| 1304 | (*domain)->id, dev_name(dev)); |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1305 | } |
| 1306 | |
Joerg Roedel | f91ba19 | 2008-11-25 12:56:12 +0100 | [diff] [blame] | 1307 | if (domain_for_device(_bdf) == NULL) |
Joerg Roedel | f1179dc | 2008-12-10 14:39:51 +0100 | [diff] [blame] | 1308 | attach_device(*iommu, *domain, _bdf); |
Joerg Roedel | f91ba19 | 2008-11-25 12:56:12 +0100 | [diff] [blame] | 1309 | |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1310 | return 1; |
| 1311 | } |
| 1312 | |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 1313 | static void update_device_table(struct protection_domain *domain) |
| 1314 | { |
| 1315 | int i; |
| 1316 | |
| 1317 | for (i = 0; i <= amd_iommu_last_bdf; ++i) { |
| 1318 | if (amd_iommu_pd_table[i] != domain) |
| 1319 | continue; |
| 1320 | set_dte_entry(i, domain); |
| 1321 | } |
| 1322 | } |
| 1323 | |
| 1324 | static void update_domain(struct protection_domain *domain) |
| 1325 | { |
| 1326 | if (!domain->updated) |
| 1327 | return; |
| 1328 | |
| 1329 | update_device_table(domain); |
| 1330 | flush_devices_by_domain(domain); |
| 1331 | iommu_flush_domain(domain->id); |
| 1332 | |
| 1333 | domain->updated = false; |
| 1334 | } |
| 1335 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1336 | /* |
Joerg Roedel | 50020fb | 2009-09-02 15:38:40 +0200 | [diff] [blame] | 1337 | * This function is used to add another level to an IO page table. Adding |
| 1338 | * another level increases the size of the address space by 9 bits to a size up |
| 1339 | * to 64 bits. |
| 1340 | */ |
| 1341 | static bool increase_address_space(struct protection_domain *domain, |
| 1342 | gfp_t gfp) |
| 1343 | { |
| 1344 | u64 *pte; |
| 1345 | |
| 1346 | if (domain->mode == PAGE_MODE_6_LEVEL) |
| 1347 | /* address space already 64 bit large */ |
| 1348 | return false; |
| 1349 | |
| 1350 | pte = (void *)get_zeroed_page(gfp); |
| 1351 | if (!pte) |
| 1352 | return false; |
| 1353 | |
| 1354 | *pte = PM_LEVEL_PDE(domain->mode, |
| 1355 | virt_to_phys(domain->pt_root)); |
| 1356 | domain->pt_root = pte; |
| 1357 | domain->mode += 1; |
| 1358 | domain->updated = true; |
| 1359 | |
| 1360 | return true; |
| 1361 | } |
| 1362 | |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 1363 | static u64 *alloc_pte(struct protection_domain *domain, |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame^] | 1364 | unsigned long address, |
| 1365 | int end_lvl, |
| 1366 | u64 **pte_page, |
| 1367 | gfp_t gfp) |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1368 | { |
| 1369 | u64 *pte, *page; |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 1370 | int level; |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1371 | |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 1372 | while (address > PM_LEVEL_SIZE(domain->mode)) |
| 1373 | increase_address_space(domain, gfp); |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1374 | |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 1375 | level = domain->mode - 1; |
| 1376 | pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)]; |
| 1377 | |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame^] | 1378 | while (level > end_lvl) { |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 1379 | if (!IOMMU_PTE_PRESENT(*pte)) { |
| 1380 | page = (u64 *)get_zeroed_page(gfp); |
| 1381 | if (!page) |
| 1382 | return NULL; |
| 1383 | *pte = PM_LEVEL_PDE(level, virt_to_phys(page)); |
| 1384 | } |
| 1385 | |
| 1386 | level -= 1; |
| 1387 | |
| 1388 | pte = IOMMU_PTE_PAGE(*pte); |
| 1389 | |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame^] | 1390 | if (pte_page && level == end_lvl) |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 1391 | *pte_page = pte; |
| 1392 | |
| 1393 | pte = &pte[PM_LEVEL_INDEX(level, address)]; |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1394 | } |
| 1395 | |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1396 | return pte; |
| 1397 | } |
| 1398 | |
| 1399 | /* |
| 1400 | * This function fetches the PTE for a given address in the aperture |
| 1401 | */ |
| 1402 | static u64* dma_ops_get_pte(struct dma_ops_domain *dom, |
| 1403 | unsigned long address) |
| 1404 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1405 | struct aperture_range *aperture; |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1406 | u64 *pte, *pte_page; |
| 1407 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1408 | aperture = dom->aperture[APERTURE_RANGE_INDEX(address)]; |
| 1409 | if (!aperture) |
| 1410 | return NULL; |
| 1411 | |
| 1412 | pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)]; |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1413 | if (!pte) { |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame^] | 1414 | pte = alloc_pte(&dom->domain, address, PM_MAP_4k, &pte_page, |
| 1415 | GFP_ATOMIC); |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1416 | aperture->pte_pages[APERTURE_PAGE_INDEX(address)] = pte_page; |
| 1417 | } else |
Joerg Roedel | 8c8c143 | 2009-09-02 17:30:00 +0200 | [diff] [blame] | 1418 | pte += PM_LEVEL_INDEX(0, address); |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1419 | |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 1420 | update_domain(&dom->domain); |
| 1421 | |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1422 | return pte; |
| 1423 | } |
| 1424 | |
| 1425 | /* |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1426 | * This is the generic map function. It maps one 4kb page at paddr to |
| 1427 | * the given address in the DMA address space for the domain. |
| 1428 | */ |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1429 | static dma_addr_t dma_ops_domain_map(struct amd_iommu *iommu, |
| 1430 | struct dma_ops_domain *dom, |
| 1431 | unsigned long address, |
| 1432 | phys_addr_t paddr, |
| 1433 | int direction) |
| 1434 | { |
| 1435 | u64 *pte, __pte; |
| 1436 | |
| 1437 | WARN_ON(address > dom->aperture_size); |
| 1438 | |
| 1439 | paddr &= PAGE_MASK; |
| 1440 | |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1441 | pte = dma_ops_get_pte(dom, address); |
Joerg Roedel | 53812c1 | 2009-05-12 12:17:38 +0200 | [diff] [blame] | 1442 | if (!pte) |
| 1443 | return bad_dma_address; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1444 | |
| 1445 | __pte = paddr | IOMMU_PTE_P | IOMMU_PTE_FC; |
| 1446 | |
| 1447 | if (direction == DMA_TO_DEVICE) |
| 1448 | __pte |= IOMMU_PTE_IR; |
| 1449 | else if (direction == DMA_FROM_DEVICE) |
| 1450 | __pte |= IOMMU_PTE_IW; |
| 1451 | else if (direction == DMA_BIDIRECTIONAL) |
| 1452 | __pte |= IOMMU_PTE_IR | IOMMU_PTE_IW; |
| 1453 | |
| 1454 | WARN_ON(*pte); |
| 1455 | |
| 1456 | *pte = __pte; |
| 1457 | |
| 1458 | return (dma_addr_t)address; |
| 1459 | } |
| 1460 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1461 | /* |
| 1462 | * The generic unmapping function for on page in the DMA address space. |
| 1463 | */ |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1464 | static void dma_ops_domain_unmap(struct amd_iommu *iommu, |
| 1465 | struct dma_ops_domain *dom, |
| 1466 | unsigned long address) |
| 1467 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1468 | struct aperture_range *aperture; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1469 | u64 *pte; |
| 1470 | |
| 1471 | if (address >= dom->aperture_size) |
| 1472 | return; |
| 1473 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1474 | aperture = dom->aperture[APERTURE_RANGE_INDEX(address)]; |
| 1475 | if (!aperture) |
| 1476 | return; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1477 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1478 | pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)]; |
| 1479 | if (!pte) |
| 1480 | return; |
| 1481 | |
Joerg Roedel | 8c8c143 | 2009-09-02 17:30:00 +0200 | [diff] [blame] | 1482 | pte += PM_LEVEL_INDEX(0, address); |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1483 | |
| 1484 | WARN_ON(!*pte); |
| 1485 | |
| 1486 | *pte = 0ULL; |
| 1487 | } |
| 1488 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1489 | /* |
| 1490 | * This function contains common code for mapping of a physically |
Joerg Roedel | 24f8116 | 2008-12-08 14:25:39 +0100 | [diff] [blame] | 1491 | * contiguous memory region into DMA address space. It is used by all |
| 1492 | * mapping functions provided with this IOMMU driver. |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1493 | * Must be called with the domain lock held. |
| 1494 | */ |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1495 | static dma_addr_t __map_single(struct device *dev, |
| 1496 | struct amd_iommu *iommu, |
| 1497 | struct dma_ops_domain *dma_dom, |
| 1498 | phys_addr_t paddr, |
| 1499 | size_t size, |
Joerg Roedel | 6d4f343 | 2008-09-04 19:18:02 +0200 | [diff] [blame] | 1500 | int dir, |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1501 | bool align, |
| 1502 | u64 dma_mask) |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1503 | { |
| 1504 | dma_addr_t offset = paddr & ~PAGE_MASK; |
Joerg Roedel | 53812c1 | 2009-05-12 12:17:38 +0200 | [diff] [blame] | 1505 | dma_addr_t address, start, ret; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1506 | unsigned int pages; |
Joerg Roedel | 6d4f343 | 2008-09-04 19:18:02 +0200 | [diff] [blame] | 1507 | unsigned long align_mask = 0; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1508 | int i; |
| 1509 | |
Joerg Roedel | e3c449f | 2008-10-15 22:02:11 -0700 | [diff] [blame] | 1510 | pages = iommu_num_pages(paddr, size, PAGE_SIZE); |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1511 | paddr &= PAGE_MASK; |
| 1512 | |
Joerg Roedel | 8ecaf8f | 2008-12-12 16:13:04 +0100 | [diff] [blame] | 1513 | INC_STATS_COUNTER(total_map_requests); |
| 1514 | |
Joerg Roedel | c185897 | 2008-12-12 15:42:39 +0100 | [diff] [blame] | 1515 | if (pages > 1) |
| 1516 | INC_STATS_COUNTER(cross_page); |
| 1517 | |
Joerg Roedel | 6d4f343 | 2008-09-04 19:18:02 +0200 | [diff] [blame] | 1518 | if (align) |
| 1519 | align_mask = (1UL << get_order(size)) - 1; |
| 1520 | |
Joerg Roedel | 11b8388 | 2009-05-19 10:23:15 +0200 | [diff] [blame] | 1521 | retry: |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1522 | address = dma_ops_alloc_addresses(dev, dma_dom, pages, align_mask, |
| 1523 | dma_mask); |
Joerg Roedel | 11b8388 | 2009-05-19 10:23:15 +0200 | [diff] [blame] | 1524 | if (unlikely(address == bad_dma_address)) { |
| 1525 | /* |
| 1526 | * setting next_address here will let the address |
| 1527 | * allocator only scan the new allocated range in the |
| 1528 | * first run. This is a small optimization. |
| 1529 | */ |
| 1530 | dma_dom->next_address = dma_dom->aperture_size; |
| 1531 | |
| 1532 | if (alloc_new_range(iommu, dma_dom, false, GFP_ATOMIC)) |
| 1533 | goto out; |
| 1534 | |
| 1535 | /* |
| 1536 | * aperture was sucessfully enlarged by 128 MB, try |
| 1537 | * allocation again |
| 1538 | */ |
| 1539 | goto retry; |
| 1540 | } |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1541 | |
| 1542 | start = address; |
| 1543 | for (i = 0; i < pages; ++i) { |
Joerg Roedel | 53812c1 | 2009-05-12 12:17:38 +0200 | [diff] [blame] | 1544 | ret = dma_ops_domain_map(iommu, dma_dom, start, paddr, dir); |
| 1545 | if (ret == bad_dma_address) |
| 1546 | goto out_unmap; |
| 1547 | |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1548 | paddr += PAGE_SIZE; |
| 1549 | start += PAGE_SIZE; |
| 1550 | } |
| 1551 | address += offset; |
| 1552 | |
Joerg Roedel | 5774f7c | 2008-12-12 15:57:30 +0100 | [diff] [blame] | 1553 | ADD_STATS_COUNTER(alloced_io_mem, size); |
| 1554 | |
FUJITA Tomonori | afa9fdc | 2008-09-20 01:23:30 +0900 | [diff] [blame] | 1555 | if (unlikely(dma_dom->need_flush && !amd_iommu_unmap_flush)) { |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 1556 | iommu_flush_tlb(iommu, dma_dom->domain.id); |
| 1557 | dma_dom->need_flush = false; |
| 1558 | } else if (unlikely(iommu_has_npcache(iommu))) |
Joerg Roedel | 270cab24 | 2008-09-04 15:49:46 +0200 | [diff] [blame] | 1559 | iommu_flush_pages(iommu, dma_dom->domain.id, address, size); |
| 1560 | |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1561 | out: |
| 1562 | return address; |
Joerg Roedel | 53812c1 | 2009-05-12 12:17:38 +0200 | [diff] [blame] | 1563 | |
| 1564 | out_unmap: |
| 1565 | |
| 1566 | for (--i; i >= 0; --i) { |
| 1567 | start -= PAGE_SIZE; |
| 1568 | dma_ops_domain_unmap(iommu, dma_dom, start); |
| 1569 | } |
| 1570 | |
| 1571 | dma_ops_free_addresses(dma_dom, address, pages); |
| 1572 | |
| 1573 | return bad_dma_address; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1574 | } |
| 1575 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1576 | /* |
| 1577 | * Does the reverse of the __map_single function. Must be called with |
| 1578 | * the domain lock held too |
| 1579 | */ |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1580 | static void __unmap_single(struct amd_iommu *iommu, |
| 1581 | struct dma_ops_domain *dma_dom, |
| 1582 | dma_addr_t dma_addr, |
| 1583 | size_t size, |
| 1584 | int dir) |
| 1585 | { |
| 1586 | dma_addr_t i, start; |
| 1587 | unsigned int pages; |
| 1588 | |
Joerg Roedel | b8d9905 | 2008-12-08 14:40:26 +0100 | [diff] [blame] | 1589 | if ((dma_addr == bad_dma_address) || |
| 1590 | (dma_addr + size > dma_dom->aperture_size)) |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1591 | return; |
| 1592 | |
Joerg Roedel | e3c449f | 2008-10-15 22:02:11 -0700 | [diff] [blame] | 1593 | pages = iommu_num_pages(dma_addr, size, PAGE_SIZE); |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1594 | dma_addr &= PAGE_MASK; |
| 1595 | start = dma_addr; |
| 1596 | |
| 1597 | for (i = 0; i < pages; ++i) { |
| 1598 | dma_ops_domain_unmap(iommu, dma_dom, start); |
| 1599 | start += PAGE_SIZE; |
| 1600 | } |
| 1601 | |
Joerg Roedel | 5774f7c | 2008-12-12 15:57:30 +0100 | [diff] [blame] | 1602 | SUB_STATS_COUNTER(alloced_io_mem, size); |
| 1603 | |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1604 | dma_ops_free_addresses(dma_dom, dma_addr, pages); |
Joerg Roedel | 270cab24 | 2008-09-04 15:49:46 +0200 | [diff] [blame] | 1605 | |
Joerg Roedel | 80be308 | 2008-11-06 14:59:05 +0100 | [diff] [blame] | 1606 | if (amd_iommu_unmap_flush || dma_dom->need_flush) { |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 1607 | iommu_flush_pages(iommu, dma_dom->domain.id, dma_addr, size); |
Joerg Roedel | 80be308 | 2008-11-06 14:59:05 +0100 | [diff] [blame] | 1608 | dma_dom->need_flush = false; |
| 1609 | } |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1610 | } |
| 1611 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1612 | /* |
| 1613 | * The exported map_single function for dma_ops. |
| 1614 | */ |
FUJITA Tomonori | 5149136 | 2009-01-05 23:47:25 +0900 | [diff] [blame] | 1615 | static dma_addr_t map_page(struct device *dev, struct page *page, |
| 1616 | unsigned long offset, size_t size, |
| 1617 | enum dma_data_direction dir, |
| 1618 | struct dma_attrs *attrs) |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1619 | { |
| 1620 | unsigned long flags; |
| 1621 | struct amd_iommu *iommu; |
| 1622 | struct protection_domain *domain; |
| 1623 | u16 devid; |
| 1624 | dma_addr_t addr; |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1625 | u64 dma_mask; |
FUJITA Tomonori | 5149136 | 2009-01-05 23:47:25 +0900 | [diff] [blame] | 1626 | phys_addr_t paddr = page_to_phys(page) + offset; |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1627 | |
Joerg Roedel | 0f2a86f | 2008-12-12 15:05:16 +0100 | [diff] [blame] | 1628 | INC_STATS_COUNTER(cnt_map_single); |
| 1629 | |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1630 | if (!check_device(dev)) |
| 1631 | return bad_dma_address; |
| 1632 | |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1633 | dma_mask = *dev->dma_mask; |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1634 | |
| 1635 | get_device_resources(dev, &iommu, &domain, &devid); |
| 1636 | |
| 1637 | if (iommu == NULL || domain == NULL) |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1638 | /* device not handled by any AMD IOMMU */ |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1639 | return (dma_addr_t)paddr; |
| 1640 | |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1641 | if (!dma_ops_domain(domain)) |
| 1642 | return bad_dma_address; |
| 1643 | |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1644 | spin_lock_irqsave(&domain->lock, flags); |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1645 | addr = __map_single(dev, iommu, domain->priv, paddr, size, dir, false, |
| 1646 | dma_mask); |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1647 | if (addr == bad_dma_address) |
| 1648 | goto out; |
| 1649 | |
Joerg Roedel | 09ee17e | 2008-12-03 12:19:27 +0100 | [diff] [blame] | 1650 | iommu_completion_wait(iommu); |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1651 | |
| 1652 | out: |
| 1653 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1654 | |
| 1655 | return addr; |
| 1656 | } |
| 1657 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1658 | /* |
| 1659 | * The exported unmap_single function for dma_ops. |
| 1660 | */ |
FUJITA Tomonori | 5149136 | 2009-01-05 23:47:25 +0900 | [diff] [blame] | 1661 | static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size, |
| 1662 | enum dma_data_direction dir, struct dma_attrs *attrs) |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1663 | { |
| 1664 | unsigned long flags; |
| 1665 | struct amd_iommu *iommu; |
| 1666 | struct protection_domain *domain; |
| 1667 | u16 devid; |
| 1668 | |
Joerg Roedel | 146a691 | 2008-12-12 15:07:12 +0100 | [diff] [blame] | 1669 | INC_STATS_COUNTER(cnt_unmap_single); |
| 1670 | |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1671 | if (!check_device(dev) || |
| 1672 | !get_device_resources(dev, &iommu, &domain, &devid)) |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1673 | /* device not handled by any AMD IOMMU */ |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1674 | return; |
| 1675 | |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1676 | if (!dma_ops_domain(domain)) |
| 1677 | return; |
| 1678 | |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1679 | spin_lock_irqsave(&domain->lock, flags); |
| 1680 | |
| 1681 | __unmap_single(iommu, domain->priv, dma_addr, size, dir); |
| 1682 | |
Joerg Roedel | 09ee17e | 2008-12-03 12:19:27 +0100 | [diff] [blame] | 1683 | iommu_completion_wait(iommu); |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1684 | |
| 1685 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1686 | } |
| 1687 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1688 | /* |
| 1689 | * This is a special map_sg function which is used if we should map a |
| 1690 | * device which is not handled by an AMD IOMMU in the system. |
| 1691 | */ |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1692 | static int map_sg_no_iommu(struct device *dev, struct scatterlist *sglist, |
| 1693 | int nelems, int dir) |
| 1694 | { |
| 1695 | struct scatterlist *s; |
| 1696 | int i; |
| 1697 | |
| 1698 | for_each_sg(sglist, s, nelems, i) { |
| 1699 | s->dma_address = (dma_addr_t)sg_phys(s); |
| 1700 | s->dma_length = s->length; |
| 1701 | } |
| 1702 | |
| 1703 | return nelems; |
| 1704 | } |
| 1705 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1706 | /* |
| 1707 | * The exported map_sg function for dma_ops (handles scatter-gather |
| 1708 | * lists). |
| 1709 | */ |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1710 | static int map_sg(struct device *dev, struct scatterlist *sglist, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 1711 | int nelems, enum dma_data_direction dir, |
| 1712 | struct dma_attrs *attrs) |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1713 | { |
| 1714 | unsigned long flags; |
| 1715 | struct amd_iommu *iommu; |
| 1716 | struct protection_domain *domain; |
| 1717 | u16 devid; |
| 1718 | int i; |
| 1719 | struct scatterlist *s; |
| 1720 | phys_addr_t paddr; |
| 1721 | int mapped_elems = 0; |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1722 | u64 dma_mask; |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1723 | |
Joerg Roedel | d03f067a | 2008-12-12 15:09:48 +0100 | [diff] [blame] | 1724 | INC_STATS_COUNTER(cnt_map_sg); |
| 1725 | |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1726 | if (!check_device(dev)) |
| 1727 | return 0; |
| 1728 | |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1729 | dma_mask = *dev->dma_mask; |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1730 | |
| 1731 | get_device_resources(dev, &iommu, &domain, &devid); |
| 1732 | |
| 1733 | if (!iommu || !domain) |
| 1734 | return map_sg_no_iommu(dev, sglist, nelems, dir); |
| 1735 | |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1736 | if (!dma_ops_domain(domain)) |
| 1737 | return 0; |
| 1738 | |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1739 | spin_lock_irqsave(&domain->lock, flags); |
| 1740 | |
| 1741 | for_each_sg(sglist, s, nelems, i) { |
| 1742 | paddr = sg_phys(s); |
| 1743 | |
| 1744 | s->dma_address = __map_single(dev, iommu, domain->priv, |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1745 | paddr, s->length, dir, false, |
| 1746 | dma_mask); |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1747 | |
| 1748 | if (s->dma_address) { |
| 1749 | s->dma_length = s->length; |
| 1750 | mapped_elems++; |
| 1751 | } else |
| 1752 | goto unmap; |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1753 | } |
| 1754 | |
Joerg Roedel | 09ee17e | 2008-12-03 12:19:27 +0100 | [diff] [blame] | 1755 | iommu_completion_wait(iommu); |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1756 | |
| 1757 | out: |
| 1758 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1759 | |
| 1760 | return mapped_elems; |
| 1761 | unmap: |
| 1762 | for_each_sg(sglist, s, mapped_elems, i) { |
| 1763 | if (s->dma_address) |
| 1764 | __unmap_single(iommu, domain->priv, s->dma_address, |
| 1765 | s->dma_length, dir); |
| 1766 | s->dma_address = s->dma_length = 0; |
| 1767 | } |
| 1768 | |
| 1769 | mapped_elems = 0; |
| 1770 | |
| 1771 | goto out; |
| 1772 | } |
| 1773 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1774 | /* |
| 1775 | * The exported map_sg function for dma_ops (handles scatter-gather |
| 1776 | * lists). |
| 1777 | */ |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1778 | static void unmap_sg(struct device *dev, struct scatterlist *sglist, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 1779 | int nelems, enum dma_data_direction dir, |
| 1780 | struct dma_attrs *attrs) |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1781 | { |
| 1782 | unsigned long flags; |
| 1783 | struct amd_iommu *iommu; |
| 1784 | struct protection_domain *domain; |
| 1785 | struct scatterlist *s; |
| 1786 | u16 devid; |
| 1787 | int i; |
| 1788 | |
Joerg Roedel | 55877a6 | 2008-12-12 15:12:14 +0100 | [diff] [blame] | 1789 | INC_STATS_COUNTER(cnt_unmap_sg); |
| 1790 | |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1791 | if (!check_device(dev) || |
| 1792 | !get_device_resources(dev, &iommu, &domain, &devid)) |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1793 | return; |
| 1794 | |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1795 | if (!dma_ops_domain(domain)) |
| 1796 | return; |
| 1797 | |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1798 | spin_lock_irqsave(&domain->lock, flags); |
| 1799 | |
| 1800 | for_each_sg(sglist, s, nelems, i) { |
| 1801 | __unmap_single(iommu, domain->priv, s->dma_address, |
| 1802 | s->dma_length, dir); |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1803 | s->dma_address = s->dma_length = 0; |
| 1804 | } |
| 1805 | |
Joerg Roedel | 09ee17e | 2008-12-03 12:19:27 +0100 | [diff] [blame] | 1806 | iommu_completion_wait(iommu); |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1807 | |
| 1808 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1809 | } |
| 1810 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1811 | /* |
| 1812 | * The exported alloc_coherent function for dma_ops. |
| 1813 | */ |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1814 | static void *alloc_coherent(struct device *dev, size_t size, |
| 1815 | dma_addr_t *dma_addr, gfp_t flag) |
| 1816 | { |
| 1817 | unsigned long flags; |
| 1818 | void *virt_addr; |
| 1819 | struct amd_iommu *iommu; |
| 1820 | struct protection_domain *domain; |
| 1821 | u16 devid; |
| 1822 | phys_addr_t paddr; |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1823 | u64 dma_mask = dev->coherent_dma_mask; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1824 | |
Joerg Roedel | c8f0fb3 | 2008-12-12 15:14:21 +0100 | [diff] [blame] | 1825 | INC_STATS_COUNTER(cnt_alloc_coherent); |
| 1826 | |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1827 | if (!check_device(dev)) |
| 1828 | return NULL; |
| 1829 | |
FUJITA Tomonori | 13d9fea | 2008-09-10 20:19:40 +0900 | [diff] [blame] | 1830 | if (!get_device_resources(dev, &iommu, &domain, &devid)) |
| 1831 | flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32); |
| 1832 | |
Joerg Roedel | c97ac53 | 2008-09-11 10:59:15 +0200 | [diff] [blame] | 1833 | flag |= __GFP_ZERO; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1834 | virt_addr = (void *)__get_free_pages(flag, get_order(size)); |
| 1835 | if (!virt_addr) |
Jaswinder Singh Rajput | b25ae67 | 2009-07-01 19:53:14 +0530 | [diff] [blame] | 1836 | return NULL; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1837 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1838 | paddr = virt_to_phys(virt_addr); |
| 1839 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1840 | if (!iommu || !domain) { |
| 1841 | *dma_addr = (dma_addr_t)paddr; |
| 1842 | return virt_addr; |
| 1843 | } |
| 1844 | |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1845 | if (!dma_ops_domain(domain)) |
| 1846 | goto out_free; |
| 1847 | |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1848 | if (!dma_mask) |
| 1849 | dma_mask = *dev->dma_mask; |
| 1850 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1851 | spin_lock_irqsave(&domain->lock, flags); |
| 1852 | |
| 1853 | *dma_addr = __map_single(dev, iommu, domain->priv, paddr, |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1854 | size, DMA_BIDIRECTIONAL, true, dma_mask); |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1855 | |
Jiri Slaby | 367d04c | 2009-05-28 09:54:48 +0200 | [diff] [blame] | 1856 | if (*dma_addr == bad_dma_address) { |
| 1857 | spin_unlock_irqrestore(&domain->lock, flags); |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1858 | goto out_free; |
Jiri Slaby | 367d04c | 2009-05-28 09:54:48 +0200 | [diff] [blame] | 1859 | } |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1860 | |
Joerg Roedel | 09ee17e | 2008-12-03 12:19:27 +0100 | [diff] [blame] | 1861 | iommu_completion_wait(iommu); |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1862 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1863 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1864 | |
| 1865 | return virt_addr; |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1866 | |
| 1867 | out_free: |
| 1868 | |
| 1869 | free_pages((unsigned long)virt_addr, get_order(size)); |
| 1870 | |
| 1871 | return NULL; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1872 | } |
| 1873 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1874 | /* |
| 1875 | * The exported free_coherent function for dma_ops. |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1876 | */ |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1877 | static void free_coherent(struct device *dev, size_t size, |
| 1878 | void *virt_addr, dma_addr_t dma_addr) |
| 1879 | { |
| 1880 | unsigned long flags; |
| 1881 | struct amd_iommu *iommu; |
| 1882 | struct protection_domain *domain; |
| 1883 | u16 devid; |
| 1884 | |
Joerg Roedel | 5d31ee7 | 2008-12-12 15:16:38 +0100 | [diff] [blame] | 1885 | INC_STATS_COUNTER(cnt_free_coherent); |
| 1886 | |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1887 | if (!check_device(dev)) |
| 1888 | return; |
| 1889 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1890 | get_device_resources(dev, &iommu, &domain, &devid); |
| 1891 | |
| 1892 | if (!iommu || !domain) |
| 1893 | goto free_mem; |
| 1894 | |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1895 | if (!dma_ops_domain(domain)) |
| 1896 | goto free_mem; |
| 1897 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1898 | spin_lock_irqsave(&domain->lock, flags); |
| 1899 | |
| 1900 | __unmap_single(iommu, domain->priv, dma_addr, size, DMA_BIDIRECTIONAL); |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1901 | |
Joerg Roedel | 09ee17e | 2008-12-03 12:19:27 +0100 | [diff] [blame] | 1902 | iommu_completion_wait(iommu); |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1903 | |
| 1904 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1905 | |
| 1906 | free_mem: |
| 1907 | free_pages((unsigned long)virt_addr, get_order(size)); |
| 1908 | } |
| 1909 | |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 1910 | /* |
Joerg Roedel | b39ba6a | 2008-09-09 18:40:46 +0200 | [diff] [blame] | 1911 | * This function is called by the DMA layer to find out if we can handle a |
| 1912 | * particular device. It is part of the dma_ops. |
| 1913 | */ |
| 1914 | static int amd_iommu_dma_supported(struct device *dev, u64 mask) |
| 1915 | { |
| 1916 | u16 bdf; |
| 1917 | struct pci_dev *pcidev; |
| 1918 | |
| 1919 | /* No device or no PCI device */ |
| 1920 | if (!dev || dev->bus != &pci_bus_type) |
| 1921 | return 0; |
| 1922 | |
| 1923 | pcidev = to_pci_dev(dev); |
| 1924 | |
| 1925 | bdf = calc_devid(pcidev->bus->number, pcidev->devfn); |
| 1926 | |
| 1927 | /* Out of our scope? */ |
| 1928 | if (bdf > amd_iommu_last_bdf) |
| 1929 | return 0; |
| 1930 | |
| 1931 | return 1; |
| 1932 | } |
| 1933 | |
| 1934 | /* |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1935 | * The function for pre-allocating protection domains. |
| 1936 | * |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 1937 | * If the driver core informs the DMA layer if a driver grabs a device |
| 1938 | * we don't need to preallocate the protection domains anymore. |
| 1939 | * For now we have to. |
| 1940 | */ |
Jaswinder Singh Rajput | 0e93dd8 | 2008-12-29 21:45:22 +0530 | [diff] [blame] | 1941 | static void prealloc_protection_domains(void) |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 1942 | { |
| 1943 | struct pci_dev *dev = NULL; |
| 1944 | struct dma_ops_domain *dma_dom; |
| 1945 | struct amd_iommu *iommu; |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 1946 | u16 devid; |
| 1947 | |
| 1948 | 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] | 1949 | devid = calc_devid(dev->bus->number, dev->devfn); |
Joerg Roedel | 3a61ec3 | 2008-07-25 13:07:50 +0200 | [diff] [blame] | 1950 | if (devid > amd_iommu_last_bdf) |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 1951 | continue; |
| 1952 | devid = amd_iommu_alias_table[devid]; |
| 1953 | if (domain_for_device(devid)) |
| 1954 | continue; |
| 1955 | iommu = amd_iommu_rlookup_table[devid]; |
| 1956 | if (!iommu) |
| 1957 | continue; |
Joerg Roedel | d9cfed9 | 2009-05-19 12:16:29 +0200 | [diff] [blame] | 1958 | dma_dom = dma_ops_domain_alloc(iommu); |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 1959 | if (!dma_dom) |
| 1960 | continue; |
| 1961 | init_unity_mappings_for_device(dma_dom, devid); |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 1962 | dma_dom->target_dev = devid; |
| 1963 | |
| 1964 | list_add_tail(&dma_dom->list, &iommu_pd_list); |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 1965 | } |
| 1966 | } |
| 1967 | |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 1968 | static struct dma_map_ops amd_iommu_dma_ops = { |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1969 | .alloc_coherent = alloc_coherent, |
| 1970 | .free_coherent = free_coherent, |
FUJITA Tomonori | 5149136 | 2009-01-05 23:47:25 +0900 | [diff] [blame] | 1971 | .map_page = map_page, |
| 1972 | .unmap_page = unmap_page, |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1973 | .map_sg = map_sg, |
| 1974 | .unmap_sg = unmap_sg, |
Joerg Roedel | b39ba6a | 2008-09-09 18:40:46 +0200 | [diff] [blame] | 1975 | .dma_supported = amd_iommu_dma_supported, |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1976 | }; |
| 1977 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1978 | /* |
| 1979 | * The function which clues the AMD IOMMU driver into dma_ops. |
| 1980 | */ |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1981 | int __init amd_iommu_init_dma_ops(void) |
| 1982 | { |
| 1983 | struct amd_iommu *iommu; |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1984 | int ret; |
| 1985 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1986 | /* |
| 1987 | * first allocate a default protection domain for every IOMMU we |
| 1988 | * found in the system. Devices not assigned to any other |
| 1989 | * protection domain will be assigned to the default one. |
| 1990 | */ |
Joerg Roedel | 3bd2217 | 2009-05-04 15:06:20 +0200 | [diff] [blame] | 1991 | for_each_iommu(iommu) { |
Joerg Roedel | d9cfed9 | 2009-05-19 12:16:29 +0200 | [diff] [blame] | 1992 | iommu->default_dom = dma_ops_domain_alloc(iommu); |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1993 | if (iommu->default_dom == NULL) |
| 1994 | return -ENOMEM; |
Joerg Roedel | e2dc14a | 2008-12-10 18:48:59 +0100 | [diff] [blame] | 1995 | iommu->default_dom->domain.flags |= PD_DEFAULT_MASK; |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 1996 | ret = iommu_init_unity_mappings(iommu); |
| 1997 | if (ret) |
| 1998 | goto free_domains; |
| 1999 | } |
| 2000 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 2001 | /* |
| 2002 | * If device isolation is enabled, pre-allocate the protection |
| 2003 | * domains for each device. |
| 2004 | */ |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2005 | if (amd_iommu_isolate) |
| 2006 | prealloc_protection_domains(); |
| 2007 | |
| 2008 | iommu_detected = 1; |
| 2009 | force_iommu = 1; |
| 2010 | bad_dma_address = 0; |
Ingo Molnar | 92af4e2 | 2008-06-27 10:48:16 +0200 | [diff] [blame] | 2011 | #ifdef CONFIG_GART_IOMMU |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2012 | gart_iommu_aperture_disabled = 1; |
| 2013 | gart_iommu_aperture = 0; |
Ingo Molnar | 92af4e2 | 2008-06-27 10:48:16 +0200 | [diff] [blame] | 2014 | #endif |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2015 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 2016 | /* Make the driver finally visible to the drivers */ |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2017 | dma_ops = &amd_iommu_dma_ops; |
| 2018 | |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 2019 | register_iommu(&amd_iommu_ops); |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 2020 | |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 2021 | bus_register_notifier(&pci_bus_type, &device_nb); |
| 2022 | |
Joerg Roedel | 7f26508 | 2008-12-12 13:50:21 +0100 | [diff] [blame] | 2023 | amd_iommu_stats_init(); |
| 2024 | |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2025 | return 0; |
| 2026 | |
| 2027 | free_domains: |
| 2028 | |
Joerg Roedel | 3bd2217 | 2009-05-04 15:06:20 +0200 | [diff] [blame] | 2029 | for_each_iommu(iommu) { |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2030 | if (iommu->default_dom) |
| 2031 | dma_ops_domain_free(iommu->default_dom); |
| 2032 | } |
| 2033 | |
| 2034 | return ret; |
| 2035 | } |
Joerg Roedel | 6d98cd8 | 2008-12-08 12:05:55 +0100 | [diff] [blame] | 2036 | |
| 2037 | /***************************************************************************** |
| 2038 | * |
| 2039 | * The following functions belong to the exported interface of AMD IOMMU |
| 2040 | * |
| 2041 | * This interface allows access to lower level functions of the IOMMU |
| 2042 | * like protection domain handling and assignement of devices to domains |
| 2043 | * which is not possible with the dma_ops interface. |
| 2044 | * |
| 2045 | *****************************************************************************/ |
| 2046 | |
Joerg Roedel | 6d98cd8 | 2008-12-08 12:05:55 +0100 | [diff] [blame] | 2047 | static void cleanup_domain(struct protection_domain *domain) |
| 2048 | { |
| 2049 | unsigned long flags; |
| 2050 | u16 devid; |
| 2051 | |
| 2052 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 2053 | |
| 2054 | for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) |
| 2055 | if (amd_iommu_pd_table[devid] == domain) |
| 2056 | __detach_device(domain, devid); |
| 2057 | |
| 2058 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 2059 | } |
| 2060 | |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 2061 | static int amd_iommu_domain_init(struct iommu_domain *dom) |
| 2062 | { |
| 2063 | struct protection_domain *domain; |
| 2064 | |
| 2065 | domain = kzalloc(sizeof(*domain), GFP_KERNEL); |
| 2066 | if (!domain) |
| 2067 | return -ENOMEM; |
| 2068 | |
| 2069 | spin_lock_init(&domain->lock); |
| 2070 | domain->mode = PAGE_MODE_3_LEVEL; |
| 2071 | domain->id = domain_id_alloc(); |
| 2072 | if (!domain->id) |
| 2073 | goto out_free; |
| 2074 | domain->pt_root = (void *)get_zeroed_page(GFP_KERNEL); |
| 2075 | if (!domain->pt_root) |
| 2076 | goto out_free; |
| 2077 | |
| 2078 | dom->priv = domain; |
| 2079 | |
| 2080 | return 0; |
| 2081 | |
| 2082 | out_free: |
| 2083 | kfree(domain); |
| 2084 | |
| 2085 | return -ENOMEM; |
| 2086 | } |
| 2087 | |
Joerg Roedel | 98383fc | 2008-12-02 18:34:12 +0100 | [diff] [blame] | 2088 | static void amd_iommu_domain_destroy(struct iommu_domain *dom) |
| 2089 | { |
| 2090 | struct protection_domain *domain = dom->priv; |
| 2091 | |
| 2092 | if (!domain) |
| 2093 | return; |
| 2094 | |
| 2095 | if (domain->dev_cnt > 0) |
| 2096 | cleanup_domain(domain); |
| 2097 | |
| 2098 | BUG_ON(domain->dev_cnt != 0); |
| 2099 | |
| 2100 | free_pagetable(domain); |
| 2101 | |
| 2102 | domain_id_free(domain->id); |
| 2103 | |
| 2104 | kfree(domain); |
| 2105 | |
| 2106 | dom->priv = NULL; |
| 2107 | } |
| 2108 | |
Joerg Roedel | 684f288 | 2008-12-08 12:07:44 +0100 | [diff] [blame] | 2109 | static void amd_iommu_detach_device(struct iommu_domain *dom, |
| 2110 | struct device *dev) |
| 2111 | { |
| 2112 | struct protection_domain *domain = dom->priv; |
| 2113 | struct amd_iommu *iommu; |
| 2114 | struct pci_dev *pdev; |
| 2115 | u16 devid; |
| 2116 | |
| 2117 | if (dev->bus != &pci_bus_type) |
| 2118 | return; |
| 2119 | |
| 2120 | pdev = to_pci_dev(dev); |
| 2121 | |
| 2122 | devid = calc_devid(pdev->bus->number, pdev->devfn); |
| 2123 | |
| 2124 | if (devid > 0) |
| 2125 | detach_device(domain, devid); |
| 2126 | |
| 2127 | iommu = amd_iommu_rlookup_table[devid]; |
| 2128 | if (!iommu) |
| 2129 | return; |
| 2130 | |
| 2131 | iommu_queue_inv_dev_entry(iommu, devid); |
| 2132 | iommu_completion_wait(iommu); |
| 2133 | } |
| 2134 | |
Joerg Roedel | 0110606 | 2008-12-02 19:34:11 +0100 | [diff] [blame] | 2135 | static int amd_iommu_attach_device(struct iommu_domain *dom, |
| 2136 | struct device *dev) |
| 2137 | { |
| 2138 | struct protection_domain *domain = dom->priv; |
| 2139 | struct protection_domain *old_domain; |
| 2140 | struct amd_iommu *iommu; |
| 2141 | struct pci_dev *pdev; |
| 2142 | u16 devid; |
| 2143 | |
| 2144 | if (dev->bus != &pci_bus_type) |
| 2145 | return -EINVAL; |
| 2146 | |
| 2147 | pdev = to_pci_dev(dev); |
| 2148 | |
| 2149 | devid = calc_devid(pdev->bus->number, pdev->devfn); |
| 2150 | |
| 2151 | if (devid >= amd_iommu_last_bdf || |
| 2152 | devid != amd_iommu_alias_table[devid]) |
| 2153 | return -EINVAL; |
| 2154 | |
| 2155 | iommu = amd_iommu_rlookup_table[devid]; |
| 2156 | if (!iommu) |
| 2157 | return -EINVAL; |
| 2158 | |
| 2159 | old_domain = domain_for_device(devid); |
| 2160 | if (old_domain) |
Joerg Roedel | 71ff3bc | 2009-06-08 13:47:33 -0700 | [diff] [blame] | 2161 | detach_device(old_domain, devid); |
Joerg Roedel | 0110606 | 2008-12-02 19:34:11 +0100 | [diff] [blame] | 2162 | |
| 2163 | attach_device(iommu, domain, devid); |
| 2164 | |
| 2165 | iommu_completion_wait(iommu); |
| 2166 | |
| 2167 | return 0; |
| 2168 | } |
| 2169 | |
Joerg Roedel | c6229ca | 2008-12-02 19:48:43 +0100 | [diff] [blame] | 2170 | static int amd_iommu_map_range(struct iommu_domain *dom, |
| 2171 | unsigned long iova, phys_addr_t paddr, |
| 2172 | size_t size, int iommu_prot) |
| 2173 | { |
| 2174 | struct protection_domain *domain = dom->priv; |
| 2175 | unsigned long i, npages = iommu_num_pages(paddr, size, PAGE_SIZE); |
| 2176 | int prot = 0; |
| 2177 | int ret; |
| 2178 | |
| 2179 | if (iommu_prot & IOMMU_READ) |
| 2180 | prot |= IOMMU_PROT_IR; |
| 2181 | if (iommu_prot & IOMMU_WRITE) |
| 2182 | prot |= IOMMU_PROT_IW; |
| 2183 | |
| 2184 | iova &= PAGE_MASK; |
| 2185 | paddr &= PAGE_MASK; |
| 2186 | |
| 2187 | for (i = 0; i < npages; ++i) { |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame^] | 2188 | ret = iommu_map_page(domain, iova, paddr, prot, PM_MAP_4k); |
Joerg Roedel | c6229ca | 2008-12-02 19:48:43 +0100 | [diff] [blame] | 2189 | if (ret) |
| 2190 | return ret; |
| 2191 | |
| 2192 | iova += PAGE_SIZE; |
| 2193 | paddr += PAGE_SIZE; |
| 2194 | } |
| 2195 | |
| 2196 | return 0; |
| 2197 | } |
| 2198 | |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 2199 | static void amd_iommu_unmap_range(struct iommu_domain *dom, |
| 2200 | unsigned long iova, size_t size) |
| 2201 | { |
| 2202 | |
| 2203 | struct protection_domain *domain = dom->priv; |
| 2204 | unsigned long i, npages = iommu_num_pages(iova, size, PAGE_SIZE); |
| 2205 | |
| 2206 | iova &= PAGE_MASK; |
| 2207 | |
| 2208 | for (i = 0; i < npages; ++i) { |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 2209 | iommu_unmap_page(domain, iova, PM_MAP_4k); |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 2210 | iova += PAGE_SIZE; |
| 2211 | } |
| 2212 | |
| 2213 | iommu_flush_domain(domain->id); |
| 2214 | } |
| 2215 | |
Joerg Roedel | 645c4c8 | 2008-12-02 20:05:50 +0100 | [diff] [blame] | 2216 | static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom, |
| 2217 | unsigned long iova) |
| 2218 | { |
| 2219 | struct protection_domain *domain = dom->priv; |
| 2220 | unsigned long offset = iova & ~PAGE_MASK; |
| 2221 | phys_addr_t paddr; |
| 2222 | u64 *pte; |
| 2223 | |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 2224 | pte = fetch_pte(domain, iova, PM_MAP_4k); |
Joerg Roedel | 645c4c8 | 2008-12-02 20:05:50 +0100 | [diff] [blame] | 2225 | |
Joerg Roedel | a6d41a4 | 2009-09-02 17:08:55 +0200 | [diff] [blame] | 2226 | if (!pte || !IOMMU_PTE_PRESENT(*pte)) |
Joerg Roedel | 645c4c8 | 2008-12-02 20:05:50 +0100 | [diff] [blame] | 2227 | return 0; |
| 2228 | |
| 2229 | paddr = *pte & IOMMU_PAGE_MASK; |
| 2230 | paddr |= offset; |
| 2231 | |
| 2232 | return paddr; |
| 2233 | } |
| 2234 | |
Sheng Yang | dbb9fd8 | 2009-03-18 15:33:06 +0800 | [diff] [blame] | 2235 | static int amd_iommu_domain_has_cap(struct iommu_domain *domain, |
| 2236 | unsigned long cap) |
| 2237 | { |
| 2238 | return 0; |
| 2239 | } |
| 2240 | |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 2241 | static struct iommu_ops amd_iommu_ops = { |
| 2242 | .domain_init = amd_iommu_domain_init, |
| 2243 | .domain_destroy = amd_iommu_domain_destroy, |
| 2244 | .attach_dev = amd_iommu_attach_device, |
| 2245 | .detach_dev = amd_iommu_detach_device, |
| 2246 | .map = amd_iommu_map_range, |
| 2247 | .unmap = amd_iommu_unmap_range, |
| 2248 | .iova_to_phys = amd_iommu_iova_to_phys, |
Sheng Yang | dbb9fd8 | 2009-03-18 15:33:06 +0800 | [diff] [blame] | 2249 | .domain_has_cap = amd_iommu_domain_has_cap, |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 2250 | }; |
| 2251 | |