Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 1 | /* |
Joerg Roedel | bf3118c | 2009-11-20 13:39:19 +0100 | [diff] [blame] | 2 | * Copyright (C) 2007-2009 Advanced Micro Devices, Inc. |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 3 | * Author: Joerg Roedel <joerg.roedel@amd.com> |
| 4 | * Leo Duran <leo.duran@amd.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License version 2 as published |
| 8 | * by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | |
| 20 | #include <linux/pci.h> |
| 21 | #include <linux/gfp.h> |
| 22 | #include <linux/bitops.h> |
Joerg Roedel | 7f26508 | 2008-12-12 13:50:21 +0100 | [diff] [blame] | 23 | #include <linux/debugfs.h> |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 24 | #include <linux/scatterlist.h> |
FUJITA Tomonori | 5149136 | 2009-01-05 23:47:25 +0900 | [diff] [blame] | 25 | #include <linux/dma-mapping.h> |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 26 | #include <linux/iommu-helper.h> |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 27 | #include <linux/iommu.h> |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 28 | #include <asm/proto.h> |
FUJITA Tomonori | 46a7fa2 | 2008-07-11 10:23:42 +0900 | [diff] [blame] | 29 | #include <asm/iommu.h> |
Joerg Roedel | 1d9b16d | 2008-11-27 18:39:15 +0100 | [diff] [blame] | 30 | #include <asm/gart.h> |
Joerg Roedel | 6a9401a | 2009-11-20 13:22:21 +0100 | [diff] [blame] | 31 | #include <asm/amd_iommu_proto.h> |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 32 | #include <asm/amd_iommu_types.h> |
Joerg Roedel | c6da992 | 2008-06-26 21:28:06 +0200 | [diff] [blame] | 33 | #include <asm/amd_iommu.h> |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 34 | |
| 35 | #define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28)) |
| 36 | |
Joerg Roedel | 136f78a | 2008-07-11 17:14:27 +0200 | [diff] [blame] | 37 | #define EXIT_LOOP_COUNT 10000000 |
| 38 | |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 39 | static DEFINE_RWLOCK(amd_iommu_devtable_lock); |
| 40 | |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 41 | /* A list of preallocated protection domains */ |
| 42 | static LIST_HEAD(iommu_pd_list); |
| 43 | static DEFINE_SPINLOCK(iommu_pd_list_lock); |
| 44 | |
Joerg Roedel | 0feae53 | 2009-08-26 15:26:30 +0200 | [diff] [blame] | 45 | /* |
| 46 | * Domain for untranslated devices - only allocated |
| 47 | * if iommu=pt passed on kernel cmd line. |
| 48 | */ |
| 49 | static struct protection_domain *pt_domain; |
| 50 | |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 51 | static struct iommu_ops amd_iommu_ops; |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 52 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 53 | /* |
| 54 | * general struct to manage commands send to an IOMMU |
| 55 | */ |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 56 | struct iommu_cmd { |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 57 | u32 data[4]; |
| 58 | }; |
| 59 | |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 60 | static int dma_ops_unity_map(struct dma_ops_domain *dma_dom, |
| 61 | struct unity_map_entry *e); |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 62 | static u64 *alloc_pte(struct protection_domain *domain, |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 63 | unsigned long address, int end_lvl, |
| 64 | u64 **pte_page, gfp_t gfp); |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 65 | static void dma_ops_reserve_addresses(struct dma_ops_domain *dom, |
| 66 | unsigned long start_page, |
| 67 | unsigned int pages); |
Joerg Roedel | a345b23 | 2009-09-03 15:01:43 +0200 | [diff] [blame] | 68 | static void reset_iommu_command_buffer(struct amd_iommu *iommu); |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 69 | static u64 *fetch_pte(struct protection_domain *domain, |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 70 | unsigned long address, int map_size); |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 71 | static void update_domain(struct protection_domain *domain); |
Chris Wright | c1eee67 | 2009-05-21 00:56:58 -0700 | [diff] [blame] | 72 | |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 73 | /**************************************************************************** |
| 74 | * |
| 75 | * Helper functions |
| 76 | * |
| 77 | ****************************************************************************/ |
| 78 | |
| 79 | static inline u16 get_device_id(struct device *dev) |
| 80 | { |
| 81 | struct pci_dev *pdev = to_pci_dev(dev); |
| 82 | |
| 83 | return calc_devid(pdev->bus->number, pdev->devfn); |
| 84 | } |
| 85 | |
Joerg Roedel | 71c7098 | 2009-11-24 16:43:06 +0100 | [diff] [blame] | 86 | /* |
| 87 | * In this function the list of preallocated protection domains is traversed to |
| 88 | * find the domain for a specific device |
| 89 | */ |
| 90 | static struct dma_ops_domain *find_protection_domain(u16 devid) |
| 91 | { |
| 92 | struct dma_ops_domain *entry, *ret = NULL; |
| 93 | unsigned long flags; |
| 94 | u16 alias = amd_iommu_alias_table[devid]; |
| 95 | |
| 96 | if (list_empty(&iommu_pd_list)) |
| 97 | return NULL; |
| 98 | |
| 99 | spin_lock_irqsave(&iommu_pd_list_lock, flags); |
| 100 | |
| 101 | list_for_each_entry(entry, &iommu_pd_list, list) { |
| 102 | if (entry->target_dev == devid || |
| 103 | entry->target_dev == alias) { |
| 104 | ret = entry; |
| 105 | break; |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | spin_unlock_irqrestore(&iommu_pd_list_lock, flags); |
| 110 | |
| 111 | return ret; |
| 112 | } |
| 113 | |
Joerg Roedel | 98fc5a6 | 2009-11-24 17:19:23 +0100 | [diff] [blame^] | 114 | /* |
| 115 | * This function checks if the driver got a valid device from the caller to |
| 116 | * avoid dereferencing invalid pointers. |
| 117 | */ |
| 118 | static bool check_device(struct device *dev) |
| 119 | { |
| 120 | u16 devid; |
| 121 | |
| 122 | if (!dev || !dev->dma_mask) |
| 123 | return false; |
| 124 | |
| 125 | /* No device or no PCI device */ |
| 126 | if (!dev || dev->bus != &pci_bus_type) |
| 127 | return false; |
| 128 | |
| 129 | devid = get_device_id(dev); |
| 130 | |
| 131 | /* Out of our scope? */ |
| 132 | if (devid > amd_iommu_last_bdf) |
| 133 | return false; |
| 134 | |
| 135 | if (amd_iommu_rlookup_table[devid] == NULL) |
| 136 | return false; |
| 137 | |
| 138 | return true; |
| 139 | } |
| 140 | |
Joerg Roedel | 7f26508 | 2008-12-12 13:50:21 +0100 | [diff] [blame] | 141 | #ifdef CONFIG_AMD_IOMMU_STATS |
| 142 | |
| 143 | /* |
| 144 | * Initialization code for statistics collection |
| 145 | */ |
| 146 | |
Joerg Roedel | da49f6d | 2008-12-12 14:59:58 +0100 | [diff] [blame] | 147 | DECLARE_STATS_COUNTER(compl_wait); |
Joerg Roedel | 0f2a86f | 2008-12-12 15:05:16 +0100 | [diff] [blame] | 148 | DECLARE_STATS_COUNTER(cnt_map_single); |
Joerg Roedel | 146a691 | 2008-12-12 15:07:12 +0100 | [diff] [blame] | 149 | DECLARE_STATS_COUNTER(cnt_unmap_single); |
Joerg Roedel | d03f067a | 2008-12-12 15:09:48 +0100 | [diff] [blame] | 150 | DECLARE_STATS_COUNTER(cnt_map_sg); |
Joerg Roedel | 55877a6 | 2008-12-12 15:12:14 +0100 | [diff] [blame] | 151 | DECLARE_STATS_COUNTER(cnt_unmap_sg); |
Joerg Roedel | c8f0fb3 | 2008-12-12 15:14:21 +0100 | [diff] [blame] | 152 | DECLARE_STATS_COUNTER(cnt_alloc_coherent); |
Joerg Roedel | 5d31ee7 | 2008-12-12 15:16:38 +0100 | [diff] [blame] | 153 | DECLARE_STATS_COUNTER(cnt_free_coherent); |
Joerg Roedel | c185897 | 2008-12-12 15:42:39 +0100 | [diff] [blame] | 154 | DECLARE_STATS_COUNTER(cross_page); |
Joerg Roedel | f57d98a | 2008-12-12 15:46:29 +0100 | [diff] [blame] | 155 | DECLARE_STATS_COUNTER(domain_flush_single); |
Joerg Roedel | 18811f5 | 2008-12-12 15:48:28 +0100 | [diff] [blame] | 156 | DECLARE_STATS_COUNTER(domain_flush_all); |
Joerg Roedel | 5774f7c | 2008-12-12 15:57:30 +0100 | [diff] [blame] | 157 | DECLARE_STATS_COUNTER(alloced_io_mem); |
Joerg Roedel | 8ecaf8f | 2008-12-12 16:13:04 +0100 | [diff] [blame] | 158 | DECLARE_STATS_COUNTER(total_map_requests); |
Joerg Roedel | da49f6d | 2008-12-12 14:59:58 +0100 | [diff] [blame] | 159 | |
Joerg Roedel | 7f26508 | 2008-12-12 13:50:21 +0100 | [diff] [blame] | 160 | static struct dentry *stats_dir; |
| 161 | static struct dentry *de_isolate; |
| 162 | static struct dentry *de_fflush; |
| 163 | |
| 164 | static void amd_iommu_stats_add(struct __iommu_counter *cnt) |
| 165 | { |
| 166 | if (stats_dir == NULL) |
| 167 | return; |
| 168 | |
| 169 | cnt->dent = debugfs_create_u64(cnt->name, 0444, stats_dir, |
| 170 | &cnt->value); |
| 171 | } |
| 172 | |
| 173 | static void amd_iommu_stats_init(void) |
| 174 | { |
| 175 | stats_dir = debugfs_create_dir("amd-iommu", NULL); |
| 176 | if (stats_dir == NULL) |
| 177 | return; |
| 178 | |
| 179 | de_isolate = debugfs_create_bool("isolation", 0444, stats_dir, |
| 180 | (u32 *)&amd_iommu_isolate); |
| 181 | |
| 182 | de_fflush = debugfs_create_bool("fullflush", 0444, stats_dir, |
| 183 | (u32 *)&amd_iommu_unmap_flush); |
Joerg Roedel | da49f6d | 2008-12-12 14:59:58 +0100 | [diff] [blame] | 184 | |
| 185 | amd_iommu_stats_add(&compl_wait); |
Joerg Roedel | 0f2a86f | 2008-12-12 15:05:16 +0100 | [diff] [blame] | 186 | amd_iommu_stats_add(&cnt_map_single); |
Joerg Roedel | 146a691 | 2008-12-12 15:07:12 +0100 | [diff] [blame] | 187 | amd_iommu_stats_add(&cnt_unmap_single); |
Joerg Roedel | d03f067a | 2008-12-12 15:09:48 +0100 | [diff] [blame] | 188 | amd_iommu_stats_add(&cnt_map_sg); |
Joerg Roedel | 55877a6 | 2008-12-12 15:12:14 +0100 | [diff] [blame] | 189 | amd_iommu_stats_add(&cnt_unmap_sg); |
Joerg Roedel | c8f0fb3 | 2008-12-12 15:14:21 +0100 | [diff] [blame] | 190 | amd_iommu_stats_add(&cnt_alloc_coherent); |
Joerg Roedel | 5d31ee7 | 2008-12-12 15:16:38 +0100 | [diff] [blame] | 191 | amd_iommu_stats_add(&cnt_free_coherent); |
Joerg Roedel | c185897 | 2008-12-12 15:42:39 +0100 | [diff] [blame] | 192 | amd_iommu_stats_add(&cross_page); |
Joerg Roedel | f57d98a | 2008-12-12 15:46:29 +0100 | [diff] [blame] | 193 | amd_iommu_stats_add(&domain_flush_single); |
Joerg Roedel | 18811f5 | 2008-12-12 15:48:28 +0100 | [diff] [blame] | 194 | amd_iommu_stats_add(&domain_flush_all); |
Joerg Roedel | 5774f7c | 2008-12-12 15:57:30 +0100 | [diff] [blame] | 195 | amd_iommu_stats_add(&alloced_io_mem); |
Joerg Roedel | 8ecaf8f | 2008-12-12 16:13:04 +0100 | [diff] [blame] | 196 | amd_iommu_stats_add(&total_map_requests); |
Joerg Roedel | 7f26508 | 2008-12-12 13:50:21 +0100 | [diff] [blame] | 197 | } |
| 198 | |
| 199 | #endif |
| 200 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 201 | /**************************************************************************** |
| 202 | * |
Joerg Roedel | a80dc3e | 2008-09-11 16:51:41 +0200 | [diff] [blame] | 203 | * Interrupt handling functions |
| 204 | * |
| 205 | ****************************************************************************/ |
| 206 | |
Joerg Roedel | e3e5987 | 2009-09-03 14:02:10 +0200 | [diff] [blame] | 207 | static void dump_dte_entry(u16 devid) |
| 208 | { |
| 209 | int i; |
| 210 | |
| 211 | for (i = 0; i < 8; ++i) |
| 212 | pr_err("AMD-Vi: DTE[%d]: %08x\n", i, |
| 213 | amd_iommu_dev_table[devid].data[i]); |
| 214 | } |
| 215 | |
Joerg Roedel | 945b4ac | 2009-09-03 14:25:02 +0200 | [diff] [blame] | 216 | static void dump_command(unsigned long phys_addr) |
| 217 | { |
| 218 | struct iommu_cmd *cmd = phys_to_virt(phys_addr); |
| 219 | int i; |
| 220 | |
| 221 | for (i = 0; i < 4; ++i) |
| 222 | pr_err("AMD-Vi: CMD[%d]: %08x\n", i, cmd->data[i]); |
| 223 | } |
| 224 | |
Joerg Roedel | a345b23 | 2009-09-03 15:01:43 +0200 | [diff] [blame] | 225 | static void iommu_print_event(struct amd_iommu *iommu, void *__evt) |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 226 | { |
| 227 | u32 *event = __evt; |
| 228 | int type = (event[1] >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK; |
| 229 | int devid = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK; |
| 230 | int domid = (event[1] >> EVENT_DOMID_SHIFT) & EVENT_DOMID_MASK; |
| 231 | int flags = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK; |
| 232 | u64 address = (u64)(((u64)event[3]) << 32) | event[2]; |
| 233 | |
Joerg Roedel | 4c6f40d | 2009-09-01 16:43:58 +0200 | [diff] [blame] | 234 | printk(KERN_ERR "AMD-Vi: Event logged ["); |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 235 | |
| 236 | switch (type) { |
| 237 | case EVENT_TYPE_ILL_DEV: |
| 238 | printk("ILLEGAL_DEV_TABLE_ENTRY device=%02x:%02x.%x " |
| 239 | "address=0x%016llx flags=0x%04x]\n", |
| 240 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 241 | address, flags); |
Joerg Roedel | e3e5987 | 2009-09-03 14:02:10 +0200 | [diff] [blame] | 242 | dump_dte_entry(devid); |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 243 | break; |
| 244 | case EVENT_TYPE_IO_FAULT: |
| 245 | printk("IO_PAGE_FAULT device=%02x:%02x.%x " |
| 246 | "domain=0x%04x address=0x%016llx flags=0x%04x]\n", |
| 247 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 248 | domid, address, flags); |
| 249 | break; |
| 250 | case EVENT_TYPE_DEV_TAB_ERR: |
| 251 | printk("DEV_TAB_HARDWARE_ERROR device=%02x:%02x.%x " |
| 252 | "address=0x%016llx flags=0x%04x]\n", |
| 253 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 254 | address, flags); |
| 255 | break; |
| 256 | case EVENT_TYPE_PAGE_TAB_ERR: |
| 257 | printk("PAGE_TAB_HARDWARE_ERROR device=%02x:%02x.%x " |
| 258 | "domain=0x%04x address=0x%016llx flags=0x%04x]\n", |
| 259 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 260 | domid, address, flags); |
| 261 | break; |
| 262 | case EVENT_TYPE_ILL_CMD: |
| 263 | printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address); |
Joerg Roedel | a345b23 | 2009-09-03 15:01:43 +0200 | [diff] [blame] | 264 | reset_iommu_command_buffer(iommu); |
Joerg Roedel | 945b4ac | 2009-09-03 14:25:02 +0200 | [diff] [blame] | 265 | dump_command(address); |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 266 | break; |
| 267 | case EVENT_TYPE_CMD_HARD_ERR: |
| 268 | printk("COMMAND_HARDWARE_ERROR address=0x%016llx " |
| 269 | "flags=0x%04x]\n", address, flags); |
| 270 | break; |
| 271 | case EVENT_TYPE_IOTLB_INV_TO: |
| 272 | printk("IOTLB_INV_TIMEOUT device=%02x:%02x.%x " |
| 273 | "address=0x%016llx]\n", |
| 274 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 275 | address); |
| 276 | break; |
| 277 | case EVENT_TYPE_INV_DEV_REQ: |
| 278 | printk("INVALID_DEVICE_REQUEST device=%02x:%02x.%x " |
| 279 | "address=0x%016llx flags=0x%04x]\n", |
| 280 | PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| 281 | address, flags); |
| 282 | break; |
| 283 | default: |
| 284 | printk(KERN_ERR "UNKNOWN type=0x%02x]\n", type); |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | static void iommu_poll_events(struct amd_iommu *iommu) |
| 289 | { |
| 290 | u32 head, tail; |
| 291 | unsigned long flags; |
| 292 | |
| 293 | spin_lock_irqsave(&iommu->lock, flags); |
| 294 | |
| 295 | head = readl(iommu->mmio_base + MMIO_EVT_HEAD_OFFSET); |
| 296 | tail = readl(iommu->mmio_base + MMIO_EVT_TAIL_OFFSET); |
| 297 | |
| 298 | while (head != tail) { |
Joerg Roedel | a345b23 | 2009-09-03 15:01:43 +0200 | [diff] [blame] | 299 | iommu_print_event(iommu, iommu->evt_buf + head); |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 300 | head = (head + EVENT_ENTRY_SIZE) % iommu->evt_buf_size; |
| 301 | } |
| 302 | |
| 303 | writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET); |
| 304 | |
| 305 | spin_unlock_irqrestore(&iommu->lock, flags); |
| 306 | } |
| 307 | |
Joerg Roedel | a80dc3e | 2008-09-11 16:51:41 +0200 | [diff] [blame] | 308 | irqreturn_t amd_iommu_int_handler(int irq, void *data) |
| 309 | { |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 310 | struct amd_iommu *iommu; |
| 311 | |
Joerg Roedel | 3bd2217 | 2009-05-04 15:06:20 +0200 | [diff] [blame] | 312 | for_each_iommu(iommu) |
Joerg Roedel | 90008ee | 2008-09-09 16:41:05 +0200 | [diff] [blame] | 313 | iommu_poll_events(iommu); |
| 314 | |
| 315 | return IRQ_HANDLED; |
Joerg Roedel | a80dc3e | 2008-09-11 16:51:41 +0200 | [diff] [blame] | 316 | } |
| 317 | |
| 318 | /**************************************************************************** |
| 319 | * |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 320 | * IOMMU command queuing functions |
| 321 | * |
| 322 | ****************************************************************************/ |
| 323 | |
| 324 | /* |
| 325 | * Writes the command to the IOMMUs command buffer and informs the |
| 326 | * hardware about the new command. Must be called with iommu->lock held. |
| 327 | */ |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 328 | 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] | 329 | { |
| 330 | u32 tail, head; |
| 331 | u8 *target; |
| 332 | |
| 333 | tail = readl(iommu->mmio_base + MMIO_CMD_TAIL_OFFSET); |
Jiri Kosina | 8a7c5ef | 2008-08-19 02:13:55 +0200 | [diff] [blame] | 334 | target = iommu->cmd_buf + tail; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 335 | memcpy_toio(target, cmd, sizeof(*cmd)); |
| 336 | tail = (tail + sizeof(*cmd)) % iommu->cmd_buf_size; |
| 337 | head = readl(iommu->mmio_base + MMIO_CMD_HEAD_OFFSET); |
| 338 | if (tail == head) |
| 339 | return -ENOMEM; |
| 340 | writel(tail, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET); |
| 341 | |
| 342 | return 0; |
| 343 | } |
| 344 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 345 | /* |
| 346 | * General queuing function for commands. Takes iommu->lock and calls |
| 347 | * __iommu_queue_command(). |
| 348 | */ |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 349 | 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] | 350 | { |
| 351 | unsigned long flags; |
| 352 | int ret; |
| 353 | |
| 354 | spin_lock_irqsave(&iommu->lock, flags); |
| 355 | ret = __iommu_queue_command(iommu, cmd); |
Joerg Roedel | 09ee17e | 2008-12-03 12:19:27 +0100 | [diff] [blame] | 356 | if (!ret) |
Joerg Roedel | 0cfd7aa | 2008-12-10 19:58:00 +0100 | [diff] [blame] | 357 | iommu->need_sync = true; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 358 | spin_unlock_irqrestore(&iommu->lock, flags); |
| 359 | |
| 360 | return ret; |
| 361 | } |
| 362 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 363 | /* |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 364 | * This function waits until an IOMMU has completed a completion |
| 365 | * wait command |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 366 | */ |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 367 | static void __iommu_wait_for_completion(struct amd_iommu *iommu) |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 368 | { |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 369 | int ready = 0; |
Joerg Roedel | 519c31b | 2008-08-14 19:55:15 +0200 | [diff] [blame] | 370 | unsigned status = 0; |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 371 | unsigned long i = 0; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 372 | |
Joerg Roedel | da49f6d | 2008-12-12 14:59:58 +0100 | [diff] [blame] | 373 | INC_STATS_COUNTER(compl_wait); |
| 374 | |
Joerg Roedel | 136f78a | 2008-07-11 17:14:27 +0200 | [diff] [blame] | 375 | while (!ready && (i < EXIT_LOOP_COUNT)) { |
| 376 | ++i; |
Joerg Roedel | 519c31b | 2008-08-14 19:55:15 +0200 | [diff] [blame] | 377 | /* wait for the bit to become one */ |
| 378 | status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET); |
| 379 | ready = status & MMIO_STATUS_COM_WAIT_INT_MASK; |
Joerg Roedel | 136f78a | 2008-07-11 17:14:27 +0200 | [diff] [blame] | 380 | } |
| 381 | |
Joerg Roedel | 519c31b | 2008-08-14 19:55:15 +0200 | [diff] [blame] | 382 | /* set bit back to zero */ |
| 383 | status &= ~MMIO_STATUS_COM_WAIT_INT_MASK; |
| 384 | writel(status, iommu->mmio_base + MMIO_STATUS_OFFSET); |
| 385 | |
Joerg Roedel | 6a1eddd | 2009-09-03 15:15:10 +0200 | [diff] [blame] | 386 | if (unlikely(i == EXIT_LOOP_COUNT)) { |
| 387 | spin_unlock(&iommu->lock); |
| 388 | reset_iommu_command_buffer(iommu); |
| 389 | spin_lock(&iommu->lock); |
| 390 | } |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 391 | } |
| 392 | |
| 393 | /* |
| 394 | * This function queues a completion wait command into the command |
| 395 | * buffer of an IOMMU |
| 396 | */ |
| 397 | static int __iommu_completion_wait(struct amd_iommu *iommu) |
| 398 | { |
| 399 | struct iommu_cmd cmd; |
| 400 | |
| 401 | memset(&cmd, 0, sizeof(cmd)); |
| 402 | cmd.data[0] = CMD_COMPL_WAIT_INT_MASK; |
| 403 | CMD_SET_TYPE(&cmd, CMD_COMPL_WAIT); |
| 404 | |
| 405 | return __iommu_queue_command(iommu, &cmd); |
| 406 | } |
| 407 | |
| 408 | /* |
| 409 | * This function is called whenever we need to ensure that the IOMMU has |
| 410 | * completed execution of all commands we sent. It sends a |
| 411 | * COMPLETION_WAIT command and waits for it to finish. The IOMMU informs |
| 412 | * us about that by writing a value to a physical address we pass with |
| 413 | * the command. |
| 414 | */ |
| 415 | static int iommu_completion_wait(struct amd_iommu *iommu) |
| 416 | { |
| 417 | int ret = 0; |
| 418 | unsigned long flags; |
| 419 | |
| 420 | spin_lock_irqsave(&iommu->lock, flags); |
| 421 | |
| 422 | if (!iommu->need_sync) |
| 423 | goto out; |
| 424 | |
| 425 | ret = __iommu_completion_wait(iommu); |
| 426 | |
Joerg Roedel | 0cfd7aa | 2008-12-10 19:58:00 +0100 | [diff] [blame] | 427 | iommu->need_sync = false; |
Joerg Roedel | 8d20196 | 2008-12-02 20:34:41 +0100 | [diff] [blame] | 428 | |
| 429 | if (ret) |
| 430 | goto out; |
| 431 | |
| 432 | __iommu_wait_for_completion(iommu); |
Joerg Roedel | 84df817 | 2008-12-17 16:36:44 +0100 | [diff] [blame] | 433 | |
Joerg Roedel | 7e4f88d | 2008-09-17 14:19:15 +0200 | [diff] [blame] | 434 | out: |
| 435 | spin_unlock_irqrestore(&iommu->lock, flags); |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 436 | |
| 437 | return 0; |
| 438 | } |
| 439 | |
Joerg Roedel | 0518a3a | 2009-11-20 16:00:05 +0100 | [diff] [blame] | 440 | static void iommu_flush_complete(struct protection_domain *domain) |
| 441 | { |
| 442 | int i; |
| 443 | |
| 444 | for (i = 0; i < amd_iommus_present; ++i) { |
| 445 | if (!domain->dev_iommu[i]) |
| 446 | continue; |
| 447 | |
| 448 | /* |
| 449 | * Devices of this domain are behind this IOMMU |
| 450 | * We need to wait for completion of all commands. |
| 451 | */ |
| 452 | iommu_completion_wait(amd_iommus[i]); |
| 453 | } |
| 454 | } |
| 455 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 456 | /* |
| 457 | * Command send function for invalidating a device table entry |
| 458 | */ |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 459 | static int iommu_queue_inv_dev_entry(struct amd_iommu *iommu, u16 devid) |
| 460 | { |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 461 | struct iommu_cmd cmd; |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 462 | int ret; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 463 | |
| 464 | BUG_ON(iommu == NULL); |
| 465 | |
| 466 | memset(&cmd, 0, sizeof(cmd)); |
| 467 | CMD_SET_TYPE(&cmd, CMD_INV_DEV_ENTRY); |
| 468 | cmd.data[0] = devid; |
| 469 | |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 470 | ret = iommu_queue_command(iommu, &cmd); |
| 471 | |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 472 | return ret; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 473 | } |
| 474 | |
Joerg Roedel | 237b6f3 | 2008-12-02 20:54:37 +0100 | [diff] [blame] | 475 | static void __iommu_build_inv_iommu_pages(struct iommu_cmd *cmd, u64 address, |
| 476 | u16 domid, int pde, int s) |
| 477 | { |
| 478 | memset(cmd, 0, sizeof(*cmd)); |
| 479 | address &= PAGE_MASK; |
| 480 | CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES); |
| 481 | cmd->data[1] |= domid; |
| 482 | cmd->data[2] = lower_32_bits(address); |
| 483 | cmd->data[3] = upper_32_bits(address); |
| 484 | if (s) /* size bit - we flush more than one 4kb page */ |
| 485 | cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK; |
| 486 | if (pde) /* PDE bit - we wan't flush everything not only the PTEs */ |
| 487 | cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK; |
| 488 | } |
| 489 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 490 | /* |
| 491 | * Generic command send function for invalidaing TLB entries |
| 492 | */ |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 493 | static int iommu_queue_inv_iommu_pages(struct amd_iommu *iommu, |
| 494 | u64 address, u16 domid, int pde, int s) |
| 495 | { |
Joerg Roedel | d644953 | 2008-07-11 17:14:28 +0200 | [diff] [blame] | 496 | struct iommu_cmd cmd; |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 497 | int ret; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 498 | |
Joerg Roedel | 237b6f3 | 2008-12-02 20:54:37 +0100 | [diff] [blame] | 499 | __iommu_build_inv_iommu_pages(&cmd, address, domid, pde, s); |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 500 | |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 501 | ret = iommu_queue_command(iommu, &cmd); |
| 502 | |
Joerg Roedel | ee2fa74 | 2008-09-17 13:47:25 +0200 | [diff] [blame] | 503 | return ret; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 504 | } |
| 505 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 506 | /* |
| 507 | * TLB invalidation function which is called from the mapping functions. |
| 508 | * It invalidates a single PTE if the range to flush is within a single |
| 509 | * page. Otherwise it flushes the whole TLB of the IOMMU. |
| 510 | */ |
Joerg Roedel | 6de8ad9 | 2009-11-23 18:30:32 +0100 | [diff] [blame] | 511 | static void __iommu_flush_pages(struct protection_domain *domain, |
| 512 | u64 address, size_t size, int pde) |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 513 | { |
Joerg Roedel | 6de8ad9 | 2009-11-23 18:30:32 +0100 | [diff] [blame] | 514 | int s = 0, i; |
Joerg Roedel | dcd1e92 | 2009-11-20 15:30:58 +0100 | [diff] [blame] | 515 | unsigned long pages = iommu_num_pages(address, size, PAGE_SIZE); |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 516 | |
| 517 | address &= PAGE_MASK; |
| 518 | |
Joerg Roedel | 999ba41 | 2008-07-03 19:35:08 +0200 | [diff] [blame] | 519 | if (pages > 1) { |
| 520 | /* |
| 521 | * If we have to flush more than one page, flush all |
| 522 | * TLB entries for this domain |
| 523 | */ |
| 524 | address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS; |
| 525 | s = 1; |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 526 | } |
| 527 | |
Joerg Roedel | 999ba41 | 2008-07-03 19:35:08 +0200 | [diff] [blame] | 528 | |
Joerg Roedel | 6de8ad9 | 2009-11-23 18:30:32 +0100 | [diff] [blame] | 529 | for (i = 0; i < amd_iommus_present; ++i) { |
| 530 | if (!domain->dev_iommu[i]) |
| 531 | continue; |
| 532 | |
| 533 | /* |
| 534 | * Devices of this domain are behind this IOMMU |
| 535 | * We need a TLB flush |
| 536 | */ |
| 537 | iommu_queue_inv_iommu_pages(amd_iommus[i], address, |
| 538 | domain->id, pde, s); |
| 539 | } |
| 540 | |
| 541 | return; |
| 542 | } |
| 543 | |
| 544 | static void iommu_flush_pages(struct protection_domain *domain, |
| 545 | u64 address, size_t size) |
| 546 | { |
| 547 | __iommu_flush_pages(domain, address, size, 0); |
Joerg Roedel | a19ae1e | 2008-06-26 21:27:55 +0200 | [diff] [blame] | 548 | } |
Joerg Roedel | b6c0271 | 2008-06-26 21:27:53 +0200 | [diff] [blame] | 549 | |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 550 | /* Flush the whole IO/TLB for a given protection domain */ |
Joerg Roedel | dcd1e92 | 2009-11-20 15:30:58 +0100 | [diff] [blame] | 551 | static void iommu_flush_tlb(struct protection_domain *domain) |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 552 | { |
Joerg Roedel | dcd1e92 | 2009-11-20 15:30:58 +0100 | [diff] [blame] | 553 | __iommu_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 0); |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 554 | } |
| 555 | |
Chris Wright | 42a49f9 | 2009-06-15 15:42:00 +0200 | [diff] [blame] | 556 | /* Flush the whole IO/TLB for a given protection domain - including PDE */ |
Joerg Roedel | dcd1e92 | 2009-11-20 15:30:58 +0100 | [diff] [blame] | 557 | static void iommu_flush_tlb_pde(struct protection_domain *domain) |
Chris Wright | 42a49f9 | 2009-06-15 15:42:00 +0200 | [diff] [blame] | 558 | { |
Joerg Roedel | dcd1e92 | 2009-11-20 15:30:58 +0100 | [diff] [blame] | 559 | __iommu_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 1); |
Chris Wright | 42a49f9 | 2009-06-15 15:42:00 +0200 | [diff] [blame] | 560 | } |
| 561 | |
Joerg Roedel | 43f4960 | 2008-12-02 21:01:12 +0100 | [diff] [blame] | 562 | /* |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 563 | * This function flushes all domains that have devices on the given IOMMU |
Joerg Roedel | 43f4960 | 2008-12-02 21:01:12 +0100 | [diff] [blame] | 564 | */ |
Joerg Roedel | e394d72 | 2009-09-03 15:28:33 +0200 | [diff] [blame] | 565 | static void flush_all_domains_on_iommu(struct amd_iommu *iommu) |
Joerg Roedel | bfd1be1 | 2009-05-05 15:33:57 +0200 | [diff] [blame] | 566 | { |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 567 | u64 address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS; |
| 568 | struct protection_domain *domain; |
| 569 | unsigned long flags; |
Joerg Roedel | bfd1be1 | 2009-05-05 15:33:57 +0200 | [diff] [blame] | 570 | |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 571 | spin_lock_irqsave(&amd_iommu_pd_lock, flags); |
| 572 | |
| 573 | list_for_each_entry(domain, &amd_iommu_pd_list, list) { |
| 574 | if (domain->dev_iommu[iommu->index] == 0) |
Joerg Roedel | bfd1be1 | 2009-05-05 15:33:57 +0200 | [diff] [blame] | 575 | continue; |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 576 | |
| 577 | spin_lock(&domain->lock); |
| 578 | iommu_queue_inv_iommu_pages(iommu, address, domain->id, 1, 1); |
| 579 | iommu_flush_complete(domain); |
| 580 | spin_unlock(&domain->lock); |
Joerg Roedel | bfd1be1 | 2009-05-05 15:33:57 +0200 | [diff] [blame] | 581 | } |
Joerg Roedel | e394d72 | 2009-09-03 15:28:33 +0200 | [diff] [blame] | 582 | |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 583 | spin_unlock_irqrestore(&amd_iommu_pd_lock, flags); |
Joerg Roedel | e394d72 | 2009-09-03 15:28:33 +0200 | [diff] [blame] | 584 | } |
| 585 | |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 586 | /* |
| 587 | * This function uses heavy locking and may disable irqs for some time. But |
| 588 | * this is no issue because it is only called during resume. |
| 589 | */ |
Joerg Roedel | e394d72 | 2009-09-03 15:28:33 +0200 | [diff] [blame] | 590 | void amd_iommu_flush_all_domains(void) |
| 591 | { |
Joerg Roedel | e330666 | 2009-11-20 16:48:58 +0100 | [diff] [blame] | 592 | struct protection_domain *domain; |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 593 | unsigned long flags; |
| 594 | |
| 595 | spin_lock_irqsave(&amd_iommu_pd_lock, flags); |
Joerg Roedel | e394d72 | 2009-09-03 15:28:33 +0200 | [diff] [blame] | 596 | |
Joerg Roedel | e330666 | 2009-11-20 16:48:58 +0100 | [diff] [blame] | 597 | list_for_each_entry(domain, &amd_iommu_pd_list, list) { |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 598 | spin_lock(&domain->lock); |
Joerg Roedel | e330666 | 2009-11-20 16:48:58 +0100 | [diff] [blame] | 599 | iommu_flush_tlb_pde(domain); |
| 600 | iommu_flush_complete(domain); |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 601 | spin_unlock(&domain->lock); |
Joerg Roedel | e330666 | 2009-11-20 16:48:58 +0100 | [diff] [blame] | 602 | } |
Joerg Roedel | 09b4280 | 2009-11-20 17:02:44 +0100 | [diff] [blame] | 603 | |
| 604 | spin_unlock_irqrestore(&amd_iommu_pd_lock, flags); |
Joerg Roedel | bfd1be1 | 2009-05-05 15:33:57 +0200 | [diff] [blame] | 605 | } |
| 606 | |
Joerg Roedel | d586d78 | 2009-09-03 15:39:23 +0200 | [diff] [blame] | 607 | static void flush_all_devices_for_iommu(struct amd_iommu *iommu) |
| 608 | { |
| 609 | int i; |
| 610 | |
| 611 | for (i = 0; i <= amd_iommu_last_bdf; ++i) { |
| 612 | if (iommu != amd_iommu_rlookup_table[i]) |
| 613 | continue; |
| 614 | |
| 615 | iommu_queue_inv_dev_entry(iommu, i); |
| 616 | iommu_completion_wait(iommu); |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 617 | } |
| 618 | } |
| 619 | |
Joerg Roedel | 6a0dbcb | 2009-09-02 15:41:59 +0200 | [diff] [blame] | 620 | static void flush_devices_by_domain(struct protection_domain *domain) |
Joerg Roedel | 7d7a110 | 2009-05-05 15:48:10 +0200 | [diff] [blame] | 621 | { |
| 622 | struct amd_iommu *iommu; |
| 623 | int i; |
| 624 | |
| 625 | for (i = 0; i <= amd_iommu_last_bdf; ++i) { |
Joerg Roedel | 6a0dbcb | 2009-09-02 15:41:59 +0200 | [diff] [blame] | 626 | if ((domain == NULL && amd_iommu_pd_table[i] == NULL) || |
| 627 | (amd_iommu_pd_table[i] != domain)) |
Joerg Roedel | 7d7a110 | 2009-05-05 15:48:10 +0200 | [diff] [blame] | 628 | continue; |
| 629 | |
| 630 | iommu = amd_iommu_rlookup_table[i]; |
| 631 | if (!iommu) |
| 632 | continue; |
| 633 | |
| 634 | iommu_queue_inv_dev_entry(iommu, i); |
| 635 | iommu_completion_wait(iommu); |
| 636 | } |
| 637 | } |
| 638 | |
Joerg Roedel | a345b23 | 2009-09-03 15:01:43 +0200 | [diff] [blame] | 639 | static void reset_iommu_command_buffer(struct amd_iommu *iommu) |
| 640 | { |
| 641 | pr_err("AMD-Vi: Resetting IOMMU command buffer\n"); |
| 642 | |
Joerg Roedel | b26e81b | 2009-09-03 15:08:09 +0200 | [diff] [blame] | 643 | if (iommu->reset_in_progress) |
| 644 | panic("AMD-Vi: ILLEGAL_COMMAND_ERROR while resetting command buffer\n"); |
| 645 | |
| 646 | iommu->reset_in_progress = true; |
| 647 | |
Joerg Roedel | a345b23 | 2009-09-03 15:01:43 +0200 | [diff] [blame] | 648 | amd_iommu_reset_cmd_buffer(iommu); |
| 649 | flush_all_devices_for_iommu(iommu); |
| 650 | flush_all_domains_on_iommu(iommu); |
Joerg Roedel | b26e81b | 2009-09-03 15:08:09 +0200 | [diff] [blame] | 651 | |
| 652 | iommu->reset_in_progress = false; |
Joerg Roedel | a345b23 | 2009-09-03 15:01:43 +0200 | [diff] [blame] | 653 | } |
| 654 | |
Joerg Roedel | 6a0dbcb | 2009-09-02 15:41:59 +0200 | [diff] [blame] | 655 | void amd_iommu_flush_all_devices(void) |
| 656 | { |
| 657 | flush_devices_by_domain(NULL); |
| 658 | } |
| 659 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 660 | /**************************************************************************** |
| 661 | * |
| 662 | * The functions below are used the create the page table mappings for |
| 663 | * unity mapped regions. |
| 664 | * |
| 665 | ****************************************************************************/ |
| 666 | |
| 667 | /* |
| 668 | * Generic mapping functions. It maps a physical address into a DMA |
| 669 | * address space. It allocates the page table pages if necessary. |
| 670 | * In the future it can be extended to a generic mapping function |
| 671 | * supporting all features of AMD IOMMU page tables like level skipping |
| 672 | * and full 64 bit address spaces. |
| 673 | */ |
Joerg Roedel | 38e817f | 2008-12-02 17:27:52 +0100 | [diff] [blame] | 674 | static int iommu_map_page(struct protection_domain *dom, |
| 675 | unsigned long bus_addr, |
| 676 | unsigned long phys_addr, |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 677 | int prot, |
| 678 | int map_size) |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 679 | { |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 680 | u64 __pte, *pte; |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 681 | |
| 682 | bus_addr = PAGE_ALIGN(bus_addr); |
Joerg Roedel | bb9d4ff | 2008-12-04 15:59:48 +0100 | [diff] [blame] | 683 | phys_addr = PAGE_ALIGN(phys_addr); |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 684 | |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 685 | BUG_ON(!PM_ALIGNED(map_size, bus_addr)); |
| 686 | BUG_ON(!PM_ALIGNED(map_size, phys_addr)); |
| 687 | |
Joerg Roedel | bad1cac | 2009-09-02 16:52:23 +0200 | [diff] [blame] | 688 | if (!(prot & IOMMU_PROT_MASK)) |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 689 | return -EINVAL; |
| 690 | |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 691 | pte = alloc_pte(dom, bus_addr, map_size, NULL, GFP_KERNEL); |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 692 | |
| 693 | if (IOMMU_PTE_PRESENT(*pte)) |
| 694 | return -EBUSY; |
| 695 | |
| 696 | __pte = phys_addr | IOMMU_PTE_P; |
| 697 | if (prot & IOMMU_PROT_IR) |
| 698 | __pte |= IOMMU_PTE_IR; |
| 699 | if (prot & IOMMU_PROT_IW) |
| 700 | __pte |= IOMMU_PTE_IW; |
| 701 | |
| 702 | *pte = __pte; |
| 703 | |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 704 | update_domain(dom); |
| 705 | |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 706 | return 0; |
| 707 | } |
| 708 | |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 709 | static void iommu_unmap_page(struct protection_domain *dom, |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 710 | unsigned long bus_addr, int map_size) |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 711 | { |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 712 | u64 *pte = fetch_pte(dom, bus_addr, map_size); |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 713 | |
Joerg Roedel | 38a76ee | 2009-09-02 17:02:47 +0200 | [diff] [blame] | 714 | if (pte) |
| 715 | *pte = 0; |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 716 | } |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 717 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 718 | /* |
| 719 | * This function checks if a specific unity mapping entry is needed for |
| 720 | * this specific IOMMU. |
| 721 | */ |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 722 | static int iommu_for_unity_map(struct amd_iommu *iommu, |
| 723 | struct unity_map_entry *entry) |
| 724 | { |
| 725 | u16 bdf, i; |
| 726 | |
| 727 | for (i = entry->devid_start; i <= entry->devid_end; ++i) { |
| 728 | bdf = amd_iommu_alias_table[i]; |
| 729 | if (amd_iommu_rlookup_table[bdf] == iommu) |
| 730 | return 1; |
| 731 | } |
| 732 | |
| 733 | return 0; |
| 734 | } |
| 735 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 736 | /* |
| 737 | * Init the unity mappings for a specific IOMMU in the system |
| 738 | * |
| 739 | * Basically iterates over all unity mapping entries and applies them to |
| 740 | * the default domain DMA of that IOMMU if necessary. |
| 741 | */ |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 742 | static int iommu_init_unity_mappings(struct amd_iommu *iommu) |
| 743 | { |
| 744 | struct unity_map_entry *entry; |
| 745 | int ret; |
| 746 | |
| 747 | list_for_each_entry(entry, &amd_iommu_unity_map, list) { |
| 748 | if (!iommu_for_unity_map(iommu, entry)) |
| 749 | continue; |
| 750 | ret = dma_ops_unity_map(iommu->default_dom, entry); |
| 751 | if (ret) |
| 752 | return ret; |
| 753 | } |
| 754 | |
| 755 | return 0; |
| 756 | } |
| 757 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 758 | /* |
| 759 | * This function actually applies the mapping to the page table of the |
| 760 | * dma_ops domain. |
| 761 | */ |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 762 | static int dma_ops_unity_map(struct dma_ops_domain *dma_dom, |
| 763 | struct unity_map_entry *e) |
| 764 | { |
| 765 | u64 addr; |
| 766 | int ret; |
| 767 | |
| 768 | for (addr = e->address_start; addr < e->address_end; |
| 769 | addr += PAGE_SIZE) { |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 770 | ret = iommu_map_page(&dma_dom->domain, addr, addr, e->prot, |
| 771 | PM_MAP_4k); |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 772 | if (ret) |
| 773 | return ret; |
| 774 | /* |
| 775 | * if unity mapping is in aperture range mark the page |
| 776 | * as allocated in the aperture |
| 777 | */ |
| 778 | if (addr < dma_dom->aperture_size) |
Joerg Roedel | c323956 | 2009-05-12 10:56:44 +0200 | [diff] [blame] | 779 | __set_bit(addr >> PAGE_SHIFT, |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 780 | dma_dom->aperture[0]->bitmap); |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 781 | } |
| 782 | |
| 783 | return 0; |
| 784 | } |
| 785 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 786 | /* |
| 787 | * Inits the unity mappings required for a specific device |
| 788 | */ |
Joerg Roedel | bd0e521 | 2008-06-26 21:27:56 +0200 | [diff] [blame] | 789 | static int init_unity_mappings_for_device(struct dma_ops_domain *dma_dom, |
| 790 | u16 devid) |
| 791 | { |
| 792 | struct unity_map_entry *e; |
| 793 | int ret; |
| 794 | |
| 795 | list_for_each_entry(e, &amd_iommu_unity_map, list) { |
| 796 | if (!(devid >= e->devid_start && devid <= e->devid_end)) |
| 797 | continue; |
| 798 | ret = dma_ops_unity_map(dma_dom, e); |
| 799 | if (ret) |
| 800 | return ret; |
| 801 | } |
| 802 | |
| 803 | return 0; |
| 804 | } |
| 805 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 806 | /**************************************************************************** |
| 807 | * |
| 808 | * The next functions belong to the address allocator for the dma_ops |
| 809 | * interface functions. They work like the allocators in the other IOMMU |
| 810 | * drivers. Its basically a bitmap which marks the allocated pages in |
| 811 | * the aperture. Maybe it could be enhanced in the future to a more |
| 812 | * efficient allocator. |
| 813 | * |
| 814 | ****************************************************************************/ |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 815 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 816 | /* |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 817 | * The address allocator core functions. |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 818 | * |
| 819 | * called with domain->lock held |
| 820 | */ |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 821 | |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 822 | /* |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 823 | * This function checks if there is a PTE for a given dma address. If |
| 824 | * there is one, it returns the pointer to it. |
| 825 | */ |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 826 | static u64 *fetch_pte(struct protection_domain *domain, |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 827 | unsigned long address, int map_size) |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 828 | { |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 829 | int level; |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 830 | u64 *pte; |
| 831 | |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 832 | level = domain->mode - 1; |
| 833 | pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)]; |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 834 | |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 835 | while (level > map_size) { |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 836 | if (!IOMMU_PTE_PRESENT(*pte)) |
| 837 | return NULL; |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 838 | |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 839 | level -= 1; |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 840 | |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 841 | pte = IOMMU_PTE_PAGE(*pte); |
| 842 | pte = &pte[PM_LEVEL_INDEX(level, address)]; |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 843 | |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 844 | if ((PM_PTE_LEVEL(*pte) == 0) && level != map_size) { |
| 845 | pte = NULL; |
| 846 | break; |
| 847 | } |
Joerg Roedel | 9355a08 | 2009-09-02 14:24:08 +0200 | [diff] [blame] | 848 | } |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 849 | |
| 850 | return pte; |
| 851 | } |
| 852 | |
| 853 | /* |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 854 | * This function is used to add a new aperture range to an existing |
| 855 | * aperture in case of dma_ops domain allocation or address allocation |
| 856 | * failure. |
| 857 | */ |
Joerg Roedel | 576175c | 2009-11-23 19:08:46 +0100 | [diff] [blame] | 858 | static int alloc_new_range(struct dma_ops_domain *dma_dom, |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 859 | bool populate, gfp_t gfp) |
| 860 | { |
| 861 | int index = dma_dom->aperture_size >> APERTURE_RANGE_SHIFT; |
Joerg Roedel | 576175c | 2009-11-23 19:08:46 +0100 | [diff] [blame] | 862 | struct amd_iommu *iommu; |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 863 | int i; |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 864 | |
Joerg Roedel | f5e9705 | 2009-05-22 12:31:53 +0200 | [diff] [blame] | 865 | #ifdef CONFIG_IOMMU_STRESS |
| 866 | populate = false; |
| 867 | #endif |
| 868 | |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 869 | if (index >= APERTURE_MAX_RANGES) |
| 870 | return -ENOMEM; |
| 871 | |
| 872 | dma_dom->aperture[index] = kzalloc(sizeof(struct aperture_range), gfp); |
| 873 | if (!dma_dom->aperture[index]) |
| 874 | return -ENOMEM; |
| 875 | |
| 876 | dma_dom->aperture[index]->bitmap = (void *)get_zeroed_page(gfp); |
| 877 | if (!dma_dom->aperture[index]->bitmap) |
| 878 | goto out_free; |
| 879 | |
| 880 | dma_dom->aperture[index]->offset = dma_dom->aperture_size; |
| 881 | |
| 882 | if (populate) { |
| 883 | unsigned long address = dma_dom->aperture_size; |
| 884 | int i, num_ptes = APERTURE_RANGE_PAGES / 512; |
| 885 | u64 *pte, *pte_page; |
| 886 | |
| 887 | for (i = 0; i < num_ptes; ++i) { |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 888 | pte = alloc_pte(&dma_dom->domain, address, PM_MAP_4k, |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 889 | &pte_page, gfp); |
| 890 | if (!pte) |
| 891 | goto out_free; |
| 892 | |
| 893 | dma_dom->aperture[index]->pte_pages[i] = pte_page; |
| 894 | |
| 895 | address += APERTURE_RANGE_SIZE / 64; |
| 896 | } |
| 897 | } |
| 898 | |
| 899 | dma_dom->aperture_size += APERTURE_RANGE_SIZE; |
| 900 | |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 901 | /* Intialize the exclusion range if necessary */ |
Joerg Roedel | 576175c | 2009-11-23 19:08:46 +0100 | [diff] [blame] | 902 | for_each_iommu(iommu) { |
| 903 | if (iommu->exclusion_start && |
| 904 | iommu->exclusion_start >= dma_dom->aperture[index]->offset |
| 905 | && iommu->exclusion_start < dma_dom->aperture_size) { |
| 906 | unsigned long startpage; |
| 907 | int pages = iommu_num_pages(iommu->exclusion_start, |
| 908 | iommu->exclusion_length, |
| 909 | PAGE_SIZE); |
| 910 | startpage = iommu->exclusion_start >> PAGE_SHIFT; |
| 911 | dma_ops_reserve_addresses(dma_dom, startpage, pages); |
| 912 | } |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 913 | } |
| 914 | |
| 915 | /* |
| 916 | * Check for areas already mapped as present in the new aperture |
| 917 | * range and mark those pages as reserved in the allocator. Such |
| 918 | * mappings may already exist as a result of requested unity |
| 919 | * mappings for devices. |
| 920 | */ |
| 921 | for (i = dma_dom->aperture[index]->offset; |
| 922 | i < dma_dom->aperture_size; |
| 923 | i += PAGE_SIZE) { |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 924 | u64 *pte = fetch_pte(&dma_dom->domain, i, PM_MAP_4k); |
Joerg Roedel | 00cd122 | 2009-05-19 09:52:40 +0200 | [diff] [blame] | 925 | if (!pte || !IOMMU_PTE_PRESENT(*pte)) |
| 926 | continue; |
| 927 | |
| 928 | dma_ops_reserve_addresses(dma_dom, i << PAGE_SHIFT, 1); |
| 929 | } |
| 930 | |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 931 | update_domain(&dma_dom->domain); |
| 932 | |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 933 | return 0; |
| 934 | |
| 935 | out_free: |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 936 | update_domain(&dma_dom->domain); |
| 937 | |
Joerg Roedel | 9cabe89 | 2009-05-18 16:38:55 +0200 | [diff] [blame] | 938 | free_page((unsigned long)dma_dom->aperture[index]->bitmap); |
| 939 | |
| 940 | kfree(dma_dom->aperture[index]); |
| 941 | dma_dom->aperture[index] = NULL; |
| 942 | |
| 943 | return -ENOMEM; |
| 944 | } |
| 945 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 946 | static unsigned long dma_ops_area_alloc(struct device *dev, |
| 947 | struct dma_ops_domain *dom, |
| 948 | unsigned int pages, |
| 949 | unsigned long align_mask, |
| 950 | u64 dma_mask, |
| 951 | unsigned long start) |
| 952 | { |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 953 | unsigned long next_bit = dom->next_address % APERTURE_RANGE_SIZE; |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 954 | int max_index = dom->aperture_size >> APERTURE_RANGE_SHIFT; |
| 955 | int i = start >> APERTURE_RANGE_SHIFT; |
| 956 | unsigned long boundary_size; |
| 957 | unsigned long address = -1; |
| 958 | unsigned long limit; |
| 959 | |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 960 | next_bit >>= PAGE_SHIFT; |
| 961 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 962 | boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1, |
| 963 | PAGE_SIZE) >> PAGE_SHIFT; |
| 964 | |
| 965 | for (;i < max_index; ++i) { |
| 966 | unsigned long offset = dom->aperture[i]->offset >> PAGE_SHIFT; |
| 967 | |
| 968 | if (dom->aperture[i]->offset >= dma_mask) |
| 969 | break; |
| 970 | |
| 971 | limit = iommu_device_max_index(APERTURE_RANGE_PAGES, offset, |
| 972 | dma_mask >> PAGE_SHIFT); |
| 973 | |
| 974 | address = iommu_area_alloc(dom->aperture[i]->bitmap, |
| 975 | limit, next_bit, pages, 0, |
| 976 | boundary_size, align_mask); |
| 977 | if (address != -1) { |
| 978 | address = dom->aperture[i]->offset + |
| 979 | (address << PAGE_SHIFT); |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 980 | dom->next_address = address + (pages << PAGE_SHIFT); |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 981 | break; |
| 982 | } |
| 983 | |
| 984 | next_bit = 0; |
| 985 | } |
| 986 | |
| 987 | return address; |
| 988 | } |
| 989 | |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 990 | static unsigned long dma_ops_alloc_addresses(struct device *dev, |
| 991 | struct dma_ops_domain *dom, |
Joerg Roedel | 6d4f343 | 2008-09-04 19:18:02 +0200 | [diff] [blame] | 992 | unsigned int pages, |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 993 | unsigned long align_mask, |
| 994 | u64 dma_mask) |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 995 | { |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 996 | unsigned long address; |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 997 | |
Joerg Roedel | fe16f08 | 2009-05-22 12:27:53 +0200 | [diff] [blame] | 998 | #ifdef CONFIG_IOMMU_STRESS |
| 999 | dom->next_address = 0; |
| 1000 | dom->need_flush = true; |
| 1001 | #endif |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 1002 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1003 | address = dma_ops_area_alloc(dev, dom, pages, align_mask, |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 1004 | dma_mask, dom->next_address); |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 1005 | |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 1006 | if (address == -1) { |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 1007 | dom->next_address = 0; |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1008 | address = dma_ops_area_alloc(dev, dom, pages, align_mask, |
| 1009 | dma_mask, 0); |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 1010 | dom->need_flush = true; |
| 1011 | } |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 1012 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1013 | if (unlikely(address == -1)) |
FUJITA Tomonori | 8fd524b | 2009-11-15 21:19:53 +0900 | [diff] [blame] | 1014 | address = DMA_ERROR_CODE; |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 1015 | |
| 1016 | WARN_ON((address + (PAGE_SIZE*pages)) > dom->aperture_size); |
| 1017 | |
| 1018 | return address; |
| 1019 | } |
| 1020 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1021 | /* |
| 1022 | * The address free function. |
| 1023 | * |
| 1024 | * called with domain->lock held |
| 1025 | */ |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 1026 | static void dma_ops_free_addresses(struct dma_ops_domain *dom, |
| 1027 | unsigned long address, |
| 1028 | unsigned int pages) |
| 1029 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1030 | unsigned i = address >> APERTURE_RANGE_SHIFT; |
| 1031 | struct aperture_range *range = dom->aperture[i]; |
Joerg Roedel | 80be308 | 2008-11-06 14:59:05 +0100 | [diff] [blame] | 1032 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1033 | BUG_ON(i >= APERTURE_MAX_RANGES || range == NULL); |
| 1034 | |
Joerg Roedel | 47bccd6 | 2009-05-22 12:40:54 +0200 | [diff] [blame] | 1035 | #ifdef CONFIG_IOMMU_STRESS |
| 1036 | if (i < 4) |
| 1037 | return; |
| 1038 | #endif |
| 1039 | |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 1040 | if (address >= dom->next_address) |
Joerg Roedel | 80be308 | 2008-11-06 14:59:05 +0100 | [diff] [blame] | 1041 | dom->need_flush = true; |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1042 | |
| 1043 | address = (address % APERTURE_RANGE_SIZE) >> PAGE_SHIFT; |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 1044 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1045 | iommu_area_free(range->bitmap, address, pages); |
| 1046 | |
Joerg Roedel | d308644 | 2008-06-26 21:27:57 +0200 | [diff] [blame] | 1047 | } |
| 1048 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1049 | /**************************************************************************** |
| 1050 | * |
| 1051 | * The next functions belong to the domain allocation. A domain is |
| 1052 | * allocated for every IOMMU as the default domain. If device isolation |
| 1053 | * is enabled, every device get its own domain. The most important thing |
| 1054 | * about domains is the page table mapping the DMA address space they |
| 1055 | * contain. |
| 1056 | * |
| 1057 | ****************************************************************************/ |
| 1058 | |
Joerg Roedel | aeb26f5 | 2009-11-20 16:44:01 +0100 | [diff] [blame] | 1059 | /* |
| 1060 | * This function adds a protection domain to the global protection domain list |
| 1061 | */ |
| 1062 | static void add_domain_to_list(struct protection_domain *domain) |
| 1063 | { |
| 1064 | unsigned long flags; |
| 1065 | |
| 1066 | spin_lock_irqsave(&amd_iommu_pd_lock, flags); |
| 1067 | list_add(&domain->list, &amd_iommu_pd_list); |
| 1068 | spin_unlock_irqrestore(&amd_iommu_pd_lock, flags); |
| 1069 | } |
| 1070 | |
| 1071 | /* |
| 1072 | * This function removes a protection domain to the global |
| 1073 | * protection domain list |
| 1074 | */ |
| 1075 | static void del_domain_from_list(struct protection_domain *domain) |
| 1076 | { |
| 1077 | unsigned long flags; |
| 1078 | |
| 1079 | spin_lock_irqsave(&amd_iommu_pd_lock, flags); |
| 1080 | list_del(&domain->list); |
| 1081 | spin_unlock_irqrestore(&amd_iommu_pd_lock, flags); |
| 1082 | } |
| 1083 | |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1084 | static u16 domain_id_alloc(void) |
| 1085 | { |
| 1086 | unsigned long flags; |
| 1087 | int id; |
| 1088 | |
| 1089 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 1090 | id = find_first_zero_bit(amd_iommu_pd_alloc_bitmap, MAX_DOMAIN_ID); |
| 1091 | BUG_ON(id == 0); |
| 1092 | if (id > 0 && id < MAX_DOMAIN_ID) |
| 1093 | __set_bit(id, amd_iommu_pd_alloc_bitmap); |
| 1094 | else |
| 1095 | id = 0; |
| 1096 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 1097 | |
| 1098 | return id; |
| 1099 | } |
| 1100 | |
Joerg Roedel | a2acfb7 | 2008-12-02 18:28:53 +0100 | [diff] [blame] | 1101 | static void domain_id_free(int id) |
| 1102 | { |
| 1103 | unsigned long flags; |
| 1104 | |
| 1105 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 1106 | if (id > 0 && id < MAX_DOMAIN_ID) |
| 1107 | __clear_bit(id, amd_iommu_pd_alloc_bitmap); |
| 1108 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 1109 | } |
Joerg Roedel | a2acfb7 | 2008-12-02 18:28:53 +0100 | [diff] [blame] | 1110 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1111 | /* |
| 1112 | * Used to reserve address ranges in the aperture (e.g. for exclusion |
| 1113 | * ranges. |
| 1114 | */ |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1115 | static void dma_ops_reserve_addresses(struct dma_ops_domain *dom, |
| 1116 | unsigned long start_page, |
| 1117 | unsigned int pages) |
| 1118 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1119 | unsigned int i, last_page = dom->aperture_size >> PAGE_SHIFT; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1120 | |
| 1121 | if (start_page + pages > last_page) |
| 1122 | pages = last_page - start_page; |
| 1123 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1124 | for (i = start_page; i < start_page + pages; ++i) { |
| 1125 | int index = i / APERTURE_RANGE_PAGES; |
| 1126 | int page = i % APERTURE_RANGE_PAGES; |
| 1127 | __set_bit(page, dom->aperture[index]->bitmap); |
| 1128 | } |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1129 | } |
| 1130 | |
Joerg Roedel | 86db2e5 | 2008-12-02 18:20:21 +0100 | [diff] [blame] | 1131 | static void free_pagetable(struct protection_domain *domain) |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1132 | { |
| 1133 | int i, j; |
| 1134 | u64 *p1, *p2, *p3; |
| 1135 | |
Joerg Roedel | 86db2e5 | 2008-12-02 18:20:21 +0100 | [diff] [blame] | 1136 | p1 = domain->pt_root; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1137 | |
| 1138 | if (!p1) |
| 1139 | return; |
| 1140 | |
| 1141 | for (i = 0; i < 512; ++i) { |
| 1142 | if (!IOMMU_PTE_PRESENT(p1[i])) |
| 1143 | continue; |
| 1144 | |
| 1145 | p2 = IOMMU_PTE_PAGE(p1[i]); |
Joerg Roedel | 3cc3d84 | 2008-12-04 16:44:31 +0100 | [diff] [blame] | 1146 | for (j = 0; j < 512; ++j) { |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1147 | if (!IOMMU_PTE_PRESENT(p2[j])) |
| 1148 | continue; |
| 1149 | p3 = IOMMU_PTE_PAGE(p2[j]); |
| 1150 | free_page((unsigned long)p3); |
| 1151 | } |
| 1152 | |
| 1153 | free_page((unsigned long)p2); |
| 1154 | } |
| 1155 | |
| 1156 | free_page((unsigned long)p1); |
Joerg Roedel | 86db2e5 | 2008-12-02 18:20:21 +0100 | [diff] [blame] | 1157 | |
| 1158 | domain->pt_root = NULL; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1159 | } |
| 1160 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1161 | /* |
| 1162 | * Free a domain, only used if something went wrong in the |
| 1163 | * allocation path and we need to free an already allocated page table |
| 1164 | */ |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1165 | static void dma_ops_domain_free(struct dma_ops_domain *dom) |
| 1166 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1167 | int i; |
| 1168 | |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1169 | if (!dom) |
| 1170 | return; |
| 1171 | |
Joerg Roedel | aeb26f5 | 2009-11-20 16:44:01 +0100 | [diff] [blame] | 1172 | del_domain_from_list(&dom->domain); |
| 1173 | |
Joerg Roedel | 86db2e5 | 2008-12-02 18:20:21 +0100 | [diff] [blame] | 1174 | free_pagetable(&dom->domain); |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1175 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1176 | for (i = 0; i < APERTURE_MAX_RANGES; ++i) { |
| 1177 | if (!dom->aperture[i]) |
| 1178 | continue; |
| 1179 | free_page((unsigned long)dom->aperture[i]->bitmap); |
| 1180 | kfree(dom->aperture[i]); |
| 1181 | } |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1182 | |
| 1183 | kfree(dom); |
| 1184 | } |
| 1185 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1186 | /* |
| 1187 | * Allocates a new protection domain usable for the dma_ops functions. |
| 1188 | * It also intializes the page table and the address allocator data |
| 1189 | * structures required for the dma_ops interface |
| 1190 | */ |
Joerg Roedel | d9cfed9 | 2009-05-19 12:16:29 +0200 | [diff] [blame] | 1191 | 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] | 1192 | { |
| 1193 | struct dma_ops_domain *dma_dom; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1194 | |
| 1195 | dma_dom = kzalloc(sizeof(struct dma_ops_domain), GFP_KERNEL); |
| 1196 | if (!dma_dom) |
| 1197 | return NULL; |
| 1198 | |
| 1199 | spin_lock_init(&dma_dom->domain.lock); |
| 1200 | |
| 1201 | dma_dom->domain.id = domain_id_alloc(); |
| 1202 | if (dma_dom->domain.id == 0) |
| 1203 | goto free_dma_dom; |
Joerg Roedel | 8f7a017 | 2009-09-02 16:55:24 +0200 | [diff] [blame] | 1204 | dma_dom->domain.mode = PAGE_MODE_2_LEVEL; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1205 | dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL); |
Joerg Roedel | 9fdb19d | 2008-12-02 17:46:25 +0100 | [diff] [blame] | 1206 | dma_dom->domain.flags = PD_DMA_OPS_MASK; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1207 | dma_dom->domain.priv = dma_dom; |
| 1208 | if (!dma_dom->domain.pt_root) |
| 1209 | goto free_dma_dom; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1210 | |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 1211 | dma_dom->need_flush = false; |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 1212 | dma_dom->target_dev = 0xffff; |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 1213 | |
Joerg Roedel | aeb26f5 | 2009-11-20 16:44:01 +0100 | [diff] [blame] | 1214 | add_domain_to_list(&dma_dom->domain); |
| 1215 | |
Joerg Roedel | 576175c | 2009-11-23 19:08:46 +0100 | [diff] [blame] | 1216 | if (alloc_new_range(dma_dom, true, GFP_KERNEL)) |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1217 | goto free_dma_dom; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1218 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1219 | /* |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1220 | * mark the first page as allocated so we never return 0 as |
| 1221 | * a valid dma-address. So we can use 0 as error value |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1222 | */ |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1223 | dma_dom->aperture[0]->bitmap[0] = 1; |
Joerg Roedel | 803b8cb4 | 2009-05-18 15:32:48 +0200 | [diff] [blame] | 1224 | dma_dom->next_address = 0; |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1225 | |
Joerg Roedel | ec487d1 | 2008-06-26 21:27:58 +0200 | [diff] [blame] | 1226 | |
| 1227 | return dma_dom; |
| 1228 | |
| 1229 | free_dma_dom: |
| 1230 | dma_ops_domain_free(dma_dom); |
| 1231 | |
| 1232 | return NULL; |
| 1233 | } |
| 1234 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1235 | /* |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1236 | * little helper function to check whether a given protection domain is a |
| 1237 | * dma_ops domain |
| 1238 | */ |
| 1239 | static bool dma_ops_domain(struct protection_domain *domain) |
| 1240 | { |
| 1241 | return domain->flags & PD_DMA_OPS_MASK; |
| 1242 | } |
| 1243 | |
Joerg Roedel | 407d733 | 2009-09-02 16:07:00 +0200 | [diff] [blame] | 1244 | static void set_dte_entry(u16 devid, struct protection_domain *domain) |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1245 | { |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 1246 | struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1247 | u64 pte_root = virt_to_phys(domain->pt_root); |
Joerg Roedel | 863c74e | 2008-12-02 17:56:36 +0100 | [diff] [blame] | 1248 | |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 1249 | BUG_ON(amd_iommu_pd_table[devid] != NULL); |
| 1250 | |
Joerg Roedel | 38ddf41 | 2008-09-11 10:38:32 +0200 | [diff] [blame] | 1251 | pte_root |= (domain->mode & DEV_ENTRY_MODE_MASK) |
| 1252 | << DEV_ENTRY_MODE_SHIFT; |
| 1253 | 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] | 1254 | |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1255 | amd_iommu_dev_table[devid].data[2] = domain->id; |
Joerg Roedel | aa879ff | 2009-08-31 16:01:48 +0200 | [diff] [blame] | 1256 | amd_iommu_dev_table[devid].data[1] = upper_32_bits(pte_root); |
| 1257 | amd_iommu_dev_table[devid].data[0] = lower_32_bits(pte_root); |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1258 | |
| 1259 | amd_iommu_pd_table[devid] = domain; |
Joerg Roedel | eba6ac6 | 2009-09-01 12:07:08 +0200 | [diff] [blame] | 1260 | |
Joerg Roedel | c459611 | 2009-11-20 14:57:32 +0100 | [diff] [blame] | 1261 | /* Do reference counting */ |
| 1262 | domain->dev_iommu[iommu->index] += 1; |
| 1263 | domain->dev_cnt += 1; |
Joerg Roedel | eba6ac6 | 2009-09-01 12:07:08 +0200 | [diff] [blame] | 1264 | |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 1265 | /* Flush the changes DTE entry */ |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1266 | iommu_queue_inv_dev_entry(iommu, devid); |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1267 | } |
| 1268 | |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 1269 | static void clear_dte_entry(u16 devid) |
Joerg Roedel | 355bf55 | 2008-12-08 12:02:41 +0100 | [diff] [blame] | 1270 | { |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 1271 | struct protection_domain *domain = amd_iommu_pd_table[devid]; |
Joerg Roedel | c459611 | 2009-11-20 14:57:32 +0100 | [diff] [blame] | 1272 | struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; |
| 1273 | |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 1274 | BUG_ON(domain == NULL); |
Joerg Roedel | 355bf55 | 2008-12-08 12:02:41 +0100 | [diff] [blame] | 1275 | |
| 1276 | /* remove domain from the lookup table */ |
| 1277 | amd_iommu_pd_table[devid] = NULL; |
| 1278 | |
| 1279 | /* remove entry from the device table seen by the hardware */ |
| 1280 | amd_iommu_dev_table[devid].data[0] = IOMMU_PTE_P | IOMMU_PTE_TV; |
| 1281 | amd_iommu_dev_table[devid].data[1] = 0; |
| 1282 | amd_iommu_dev_table[devid].data[2] = 0; |
| 1283 | |
Joerg Roedel | c5cca14 | 2009-10-09 18:31:20 +0200 | [diff] [blame] | 1284 | amd_iommu_apply_erratum_63(devid); |
| 1285 | |
Joerg Roedel | c459611 | 2009-11-20 14:57:32 +0100 | [diff] [blame] | 1286 | /* decrease reference counters */ |
| 1287 | domain->dev_iommu[iommu->index] -= 1; |
| 1288 | domain->dev_cnt -= 1; |
Joerg Roedel | 355bf55 | 2008-12-08 12:02:41 +0100 | [diff] [blame] | 1289 | |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 1290 | iommu_queue_inv_dev_entry(iommu, devid); |
| 1291 | } |
| 1292 | |
| 1293 | /* |
| 1294 | * If a device is not yet associated with a domain, this function does |
| 1295 | * assigns it visible for the hardware |
| 1296 | */ |
| 1297 | static int __attach_device(struct device *dev, |
| 1298 | struct protection_domain *domain) |
| 1299 | { |
| 1300 | u16 devid = get_device_id(dev); |
| 1301 | u16 alias = amd_iommu_alias_table[devid]; |
| 1302 | |
| 1303 | /* lock domain */ |
| 1304 | spin_lock(&domain->lock); |
| 1305 | |
| 1306 | /* Some sanity checks */ |
| 1307 | if (amd_iommu_pd_table[alias] != NULL && |
| 1308 | amd_iommu_pd_table[alias] != domain) |
| 1309 | return -EBUSY; |
| 1310 | |
| 1311 | if (amd_iommu_pd_table[devid] != NULL && |
| 1312 | amd_iommu_pd_table[devid] != domain) |
| 1313 | return -EBUSY; |
| 1314 | |
| 1315 | /* Do real assignment */ |
| 1316 | if (alias != devid && |
| 1317 | amd_iommu_pd_table[alias] == NULL) |
| 1318 | set_dte_entry(alias, domain); |
| 1319 | |
| 1320 | if (amd_iommu_pd_table[devid] == NULL) |
| 1321 | set_dte_entry(devid, domain); |
| 1322 | |
Joerg Roedel | 355bf55 | 2008-12-08 12:02:41 +0100 | [diff] [blame] | 1323 | /* ready */ |
| 1324 | spin_unlock(&domain->lock); |
Joerg Roedel | 21129f7 | 2009-09-01 11:59:42 +0200 | [diff] [blame] | 1325 | |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 1326 | return 0; |
| 1327 | } |
| 1328 | |
| 1329 | /* |
| 1330 | * If a device is not yet associated with a domain, this function does |
| 1331 | * assigns it visible for the hardware |
| 1332 | */ |
| 1333 | static int attach_device(struct device *dev, |
| 1334 | struct protection_domain *domain) |
| 1335 | { |
| 1336 | unsigned long flags; |
| 1337 | int ret; |
| 1338 | |
| 1339 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 1340 | ret = __attach_device(dev, domain); |
| 1341 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 1342 | |
| 1343 | /* |
| 1344 | * We might boot into a crash-kernel here. The crashed kernel |
| 1345 | * left the caches in the IOMMU dirty. So we have to flush |
| 1346 | * here to evict all dirty stuff. |
| 1347 | */ |
| 1348 | iommu_flush_tlb_pde(domain); |
| 1349 | |
| 1350 | return ret; |
| 1351 | } |
| 1352 | |
| 1353 | /* |
| 1354 | * Removes a device from a protection domain (unlocked) |
| 1355 | */ |
| 1356 | static void __detach_device(struct device *dev) |
| 1357 | { |
| 1358 | u16 devid = get_device_id(dev); |
| 1359 | struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; |
| 1360 | |
| 1361 | BUG_ON(!iommu); |
| 1362 | |
| 1363 | clear_dte_entry(devid); |
| 1364 | |
Joerg Roedel | 21129f7 | 2009-09-01 11:59:42 +0200 | [diff] [blame] | 1365 | /* |
| 1366 | * If we run in passthrough mode the device must be assigned to the |
| 1367 | * passthrough domain if it is detached from any other domain |
| 1368 | */ |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 1369 | if (iommu_pass_through) |
| 1370 | __attach_device(dev, pt_domain); |
Joerg Roedel | 355bf55 | 2008-12-08 12:02:41 +0100 | [diff] [blame] | 1371 | } |
| 1372 | |
| 1373 | /* |
| 1374 | * Removes a device from a protection domain (with devtable_lock held) |
| 1375 | */ |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 1376 | static void detach_device(struct device *dev) |
Joerg Roedel | 355bf55 | 2008-12-08 12:02:41 +0100 | [diff] [blame] | 1377 | { |
| 1378 | unsigned long flags; |
| 1379 | |
| 1380 | /* lock device table */ |
| 1381 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 1382 | __detach_device(dev); |
Joerg Roedel | 355bf55 | 2008-12-08 12:02:41 +0100 | [diff] [blame] | 1383 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 1384 | } |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1385 | |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 1386 | /* |
| 1387 | * Find out the protection domain structure for a given PCI device. This |
| 1388 | * will give us the pointer to the page table root for example. |
| 1389 | */ |
| 1390 | static struct protection_domain *domain_for_device(struct device *dev) |
| 1391 | { |
| 1392 | struct protection_domain *dom; |
| 1393 | unsigned long flags; |
| 1394 | u16 devid, alias; |
| 1395 | |
| 1396 | devid = get_device_id(dev); |
| 1397 | alias = amd_iommu_alias_table[devid]; |
| 1398 | |
| 1399 | read_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 1400 | dom = amd_iommu_pd_table[devid]; |
| 1401 | if (dom == NULL && |
| 1402 | amd_iommu_pd_table[alias] != NULL) { |
| 1403 | __attach_device(dev, amd_iommu_pd_table[alias]); |
| 1404 | dom = amd_iommu_pd_table[devid]; |
| 1405 | } |
| 1406 | |
| 1407 | read_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 1408 | |
| 1409 | return dom; |
| 1410 | } |
| 1411 | |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1412 | static int device_change_notifier(struct notifier_block *nb, |
| 1413 | unsigned long action, void *data) |
| 1414 | { |
| 1415 | struct device *dev = data; |
Joerg Roedel | 98fc5a6 | 2009-11-24 17:19:23 +0100 | [diff] [blame^] | 1416 | u16 devid; |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1417 | struct protection_domain *domain; |
| 1418 | struct dma_ops_domain *dma_domain; |
| 1419 | struct amd_iommu *iommu; |
Joerg Roedel | 1ac4cbb | 2008-12-10 19:33:26 +0100 | [diff] [blame] | 1420 | unsigned long flags; |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1421 | |
Joerg Roedel | 98fc5a6 | 2009-11-24 17:19:23 +0100 | [diff] [blame^] | 1422 | if (!check_device(dev)) |
| 1423 | return 0; |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1424 | |
Joerg Roedel | 98fc5a6 | 2009-11-24 17:19:23 +0100 | [diff] [blame^] | 1425 | devid = get_device_id(dev); |
| 1426 | iommu = amd_iommu_rlookup_table[devid]; |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 1427 | domain = domain_for_device(dev); |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1428 | |
| 1429 | if (domain && !dma_ops_domain(domain)) |
| 1430 | WARN_ONCE(1, "AMD IOMMU WARNING: device %s already bound " |
| 1431 | "to a non-dma-ops domain\n", dev_name(dev)); |
| 1432 | |
| 1433 | switch (action) { |
Chris Wright | c1eee67 | 2009-05-21 00:56:58 -0700 | [diff] [blame] | 1434 | case BUS_NOTIFY_UNBOUND_DRIVER: |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1435 | if (!domain) |
| 1436 | goto out; |
Joerg Roedel | a1ca331 | 2009-09-01 12:22:22 +0200 | [diff] [blame] | 1437 | if (iommu_pass_through) |
| 1438 | break; |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 1439 | detach_device(dev); |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1440 | break; |
Joerg Roedel | 1ac4cbb | 2008-12-10 19:33:26 +0100 | [diff] [blame] | 1441 | case BUS_NOTIFY_ADD_DEVICE: |
| 1442 | /* allocate a protection domain if a device is added */ |
| 1443 | dma_domain = find_protection_domain(devid); |
| 1444 | if (dma_domain) |
| 1445 | goto out; |
Joerg Roedel | d9cfed9 | 2009-05-19 12:16:29 +0200 | [diff] [blame] | 1446 | dma_domain = dma_ops_domain_alloc(iommu); |
Joerg Roedel | 1ac4cbb | 2008-12-10 19:33:26 +0100 | [diff] [blame] | 1447 | if (!dma_domain) |
| 1448 | goto out; |
| 1449 | dma_domain->target_dev = devid; |
| 1450 | |
| 1451 | spin_lock_irqsave(&iommu_pd_list_lock, flags); |
| 1452 | list_add_tail(&dma_domain->list, &iommu_pd_list); |
| 1453 | spin_unlock_irqrestore(&iommu_pd_list_lock, flags); |
| 1454 | |
| 1455 | break; |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1456 | default: |
| 1457 | goto out; |
| 1458 | } |
| 1459 | |
| 1460 | iommu_queue_inv_dev_entry(iommu, devid); |
| 1461 | iommu_completion_wait(iommu); |
| 1462 | |
| 1463 | out: |
| 1464 | return 0; |
| 1465 | } |
| 1466 | |
Jaswinder Singh Rajput | b25ae67 | 2009-07-01 19:53:14 +0530 | [diff] [blame] | 1467 | static struct notifier_block device_nb = { |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 1468 | .notifier_call = device_change_notifier, |
| 1469 | }; |
Joerg Roedel | 355bf55 | 2008-12-08 12:02:41 +0100 | [diff] [blame] | 1470 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1471 | /***************************************************************************** |
| 1472 | * |
| 1473 | * The next functions belong to the dma_ops mapping/unmapping code. |
| 1474 | * |
| 1475 | *****************************************************************************/ |
| 1476 | |
| 1477 | /* |
| 1478 | * In the dma_ops path we only have the struct device. This function |
| 1479 | * finds the corresponding IOMMU, the protection domain and the |
| 1480 | * requestor id for a given device. |
| 1481 | * If the device is not yet associated with a domain this is also done |
| 1482 | * in this function. |
| 1483 | */ |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 1484 | static struct protection_domain *get_domain(struct device *dev) |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1485 | { |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 1486 | struct protection_domain *domain; |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1487 | struct dma_ops_domain *dma_dom; |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 1488 | u16 devid = get_device_id(dev); |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1489 | |
Joerg Roedel | f99c0f1 | 2009-11-23 16:52:56 +0100 | [diff] [blame] | 1490 | if (!check_device(dev)) |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 1491 | return ERR_PTR(-EINVAL); |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1492 | |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 1493 | domain = domain_for_device(dev); |
| 1494 | if (domain != NULL && !dma_ops_domain(domain)) |
| 1495 | return ERR_PTR(-EBUSY); |
Joerg Roedel | f99c0f1 | 2009-11-23 16:52:56 +0100 | [diff] [blame] | 1496 | |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 1497 | if (domain != NULL) |
| 1498 | return domain; |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1499 | |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 1500 | /* Device not bount yet - bind it */ |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 1501 | dma_dom = find_protection_domain(devid); |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 1502 | if (!dma_dom) |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 1503 | dma_dom = amd_iommu_rlookup_table[devid]->default_dom; |
| 1504 | attach_device(dev, &dma_dom->domain); |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 1505 | DUMP_printk("Using protection domain %d for device %s\n", |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 1506 | dma_dom->domain.id, dev_name(dev)); |
Joerg Roedel | f91ba19 | 2008-11-25 12:56:12 +0100 | [diff] [blame] | 1507 | |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 1508 | return &dma_dom->domain; |
Joerg Roedel | b20ac0d | 2008-06-26 21:27:59 +0200 | [diff] [blame] | 1509 | } |
| 1510 | |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 1511 | static void update_device_table(struct protection_domain *domain) |
| 1512 | { |
Joerg Roedel | 2b681fa | 2009-09-03 17:14:57 +0200 | [diff] [blame] | 1513 | unsigned long flags; |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 1514 | int i; |
| 1515 | |
| 1516 | for (i = 0; i <= amd_iommu_last_bdf; ++i) { |
| 1517 | if (amd_iommu_pd_table[i] != domain) |
| 1518 | continue; |
Joerg Roedel | 2b681fa | 2009-09-03 17:14:57 +0200 | [diff] [blame] | 1519 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 1520 | set_dte_entry(i, domain); |
Joerg Roedel | 2b681fa | 2009-09-03 17:14:57 +0200 | [diff] [blame] | 1521 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 1522 | } |
| 1523 | } |
| 1524 | |
| 1525 | static void update_domain(struct protection_domain *domain) |
| 1526 | { |
| 1527 | if (!domain->updated) |
| 1528 | return; |
| 1529 | |
| 1530 | update_device_table(domain); |
| 1531 | flush_devices_by_domain(domain); |
Joerg Roedel | 601367d | 2009-11-20 16:08:55 +0100 | [diff] [blame] | 1532 | iommu_flush_tlb_pde(domain); |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 1533 | |
| 1534 | domain->updated = false; |
| 1535 | } |
| 1536 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1537 | /* |
Joerg Roedel | 50020fb | 2009-09-02 15:38:40 +0200 | [diff] [blame] | 1538 | * This function is used to add another level to an IO page table. Adding |
| 1539 | * another level increases the size of the address space by 9 bits to a size up |
| 1540 | * to 64 bits. |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1541 | */ |
Joerg Roedel | 50020fb | 2009-09-02 15:38:40 +0200 | [diff] [blame] | 1542 | static bool increase_address_space(struct protection_domain *domain, |
| 1543 | gfp_t gfp) |
| 1544 | { |
| 1545 | u64 *pte; |
| 1546 | |
| 1547 | if (domain->mode == PAGE_MODE_6_LEVEL) |
| 1548 | /* address space already 64 bit large */ |
| 1549 | return false; |
| 1550 | |
| 1551 | pte = (void *)get_zeroed_page(gfp); |
| 1552 | if (!pte) |
| 1553 | return false; |
| 1554 | |
| 1555 | *pte = PM_LEVEL_PDE(domain->mode, |
| 1556 | virt_to_phys(domain->pt_root)); |
| 1557 | domain->pt_root = pte; |
| 1558 | domain->mode += 1; |
| 1559 | domain->updated = true; |
| 1560 | |
| 1561 | return true; |
| 1562 | } |
| 1563 | |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 1564 | static u64 *alloc_pte(struct protection_domain *domain, |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 1565 | unsigned long address, |
| 1566 | int end_lvl, |
| 1567 | u64 **pte_page, |
| 1568 | gfp_t gfp) |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1569 | { |
| 1570 | u64 *pte, *page; |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 1571 | int level; |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1572 | |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 1573 | while (address > PM_LEVEL_SIZE(domain->mode)) |
| 1574 | increase_address_space(domain, gfp); |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1575 | |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 1576 | level = domain->mode - 1; |
| 1577 | pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)]; |
| 1578 | |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 1579 | while (level > end_lvl) { |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 1580 | if (!IOMMU_PTE_PRESENT(*pte)) { |
| 1581 | page = (u64 *)get_zeroed_page(gfp); |
| 1582 | if (!page) |
| 1583 | return NULL; |
| 1584 | *pte = PM_LEVEL_PDE(level, virt_to_phys(page)); |
| 1585 | } |
| 1586 | |
| 1587 | level -= 1; |
| 1588 | |
| 1589 | pte = IOMMU_PTE_PAGE(*pte); |
| 1590 | |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 1591 | if (pte_page && level == end_lvl) |
Joerg Roedel | 8bc3e12 | 2009-09-02 16:48:40 +0200 | [diff] [blame] | 1592 | *pte_page = pte; |
| 1593 | |
| 1594 | pte = &pte[PM_LEVEL_INDEX(level, address)]; |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1595 | } |
| 1596 | |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1597 | return pte; |
| 1598 | } |
| 1599 | |
| 1600 | /* |
| 1601 | * This function fetches the PTE for a given address in the aperture |
| 1602 | */ |
| 1603 | static u64* dma_ops_get_pte(struct dma_ops_domain *dom, |
| 1604 | unsigned long address) |
| 1605 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1606 | struct aperture_range *aperture; |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1607 | u64 *pte, *pte_page; |
| 1608 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1609 | aperture = dom->aperture[APERTURE_RANGE_INDEX(address)]; |
| 1610 | if (!aperture) |
| 1611 | return NULL; |
| 1612 | |
| 1613 | pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)]; |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1614 | if (!pte) { |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 1615 | pte = alloc_pte(&dom->domain, address, PM_MAP_4k, &pte_page, |
| 1616 | GFP_ATOMIC); |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1617 | aperture->pte_pages[APERTURE_PAGE_INDEX(address)] = pte_page; |
| 1618 | } else |
Joerg Roedel | 8c8c143 | 2009-09-02 17:30:00 +0200 | [diff] [blame] | 1619 | pte += PM_LEVEL_INDEX(0, address); |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1620 | |
Joerg Roedel | 04bfdd8 | 2009-09-02 16:00:23 +0200 | [diff] [blame] | 1621 | update_domain(&dom->domain); |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1622 | |
| 1623 | return pte; |
| 1624 | } |
| 1625 | |
| 1626 | /* |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1627 | * This is the generic map function. It maps one 4kb page at paddr to |
| 1628 | * the given address in the DMA address space for the domain. |
| 1629 | */ |
Joerg Roedel | 680525e | 2009-11-23 18:44:42 +0100 | [diff] [blame] | 1630 | static dma_addr_t dma_ops_domain_map(struct dma_ops_domain *dom, |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1631 | unsigned long address, |
| 1632 | phys_addr_t paddr, |
| 1633 | int direction) |
| 1634 | { |
| 1635 | u64 *pte, __pte; |
| 1636 | |
| 1637 | WARN_ON(address > dom->aperture_size); |
| 1638 | |
| 1639 | paddr &= PAGE_MASK; |
| 1640 | |
Joerg Roedel | 8bda309 | 2009-05-12 12:02:46 +0200 | [diff] [blame] | 1641 | pte = dma_ops_get_pte(dom, address); |
Joerg Roedel | 53812c1 | 2009-05-12 12:17:38 +0200 | [diff] [blame] | 1642 | if (!pte) |
FUJITA Tomonori | 8fd524b | 2009-11-15 21:19:53 +0900 | [diff] [blame] | 1643 | return DMA_ERROR_CODE; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1644 | |
| 1645 | __pte = paddr | IOMMU_PTE_P | IOMMU_PTE_FC; |
| 1646 | |
| 1647 | if (direction == DMA_TO_DEVICE) |
| 1648 | __pte |= IOMMU_PTE_IR; |
| 1649 | else if (direction == DMA_FROM_DEVICE) |
| 1650 | __pte |= IOMMU_PTE_IW; |
| 1651 | else if (direction == DMA_BIDIRECTIONAL) |
| 1652 | __pte |= IOMMU_PTE_IR | IOMMU_PTE_IW; |
| 1653 | |
| 1654 | WARN_ON(*pte); |
| 1655 | |
| 1656 | *pte = __pte; |
| 1657 | |
| 1658 | return (dma_addr_t)address; |
| 1659 | } |
| 1660 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1661 | /* |
| 1662 | * The generic unmapping function for on page in the DMA address space. |
| 1663 | */ |
Joerg Roedel | 680525e | 2009-11-23 18:44:42 +0100 | [diff] [blame] | 1664 | static void dma_ops_domain_unmap(struct dma_ops_domain *dom, |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1665 | unsigned long address) |
| 1666 | { |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1667 | struct aperture_range *aperture; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1668 | u64 *pte; |
| 1669 | |
| 1670 | if (address >= dom->aperture_size) |
| 1671 | return; |
| 1672 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1673 | aperture = dom->aperture[APERTURE_RANGE_INDEX(address)]; |
| 1674 | if (!aperture) |
| 1675 | return; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1676 | |
Joerg Roedel | 384de72 | 2009-05-15 12:30:05 +0200 | [diff] [blame] | 1677 | pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)]; |
| 1678 | if (!pte) |
| 1679 | return; |
| 1680 | |
Joerg Roedel | 8c8c143 | 2009-09-02 17:30:00 +0200 | [diff] [blame] | 1681 | pte += PM_LEVEL_INDEX(0, address); |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1682 | |
| 1683 | WARN_ON(!*pte); |
| 1684 | |
| 1685 | *pte = 0ULL; |
| 1686 | } |
| 1687 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1688 | /* |
| 1689 | * This function contains common code for mapping of a physically |
Joerg Roedel | 24f8116 | 2008-12-08 14:25:39 +0100 | [diff] [blame] | 1690 | * contiguous memory region into DMA address space. It is used by all |
| 1691 | * mapping functions provided with this IOMMU driver. |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1692 | * Must be called with the domain lock held. |
| 1693 | */ |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1694 | static dma_addr_t __map_single(struct device *dev, |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1695 | struct dma_ops_domain *dma_dom, |
| 1696 | phys_addr_t paddr, |
| 1697 | size_t size, |
Joerg Roedel | 6d4f343 | 2008-09-04 19:18:02 +0200 | [diff] [blame] | 1698 | int dir, |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1699 | bool align, |
| 1700 | u64 dma_mask) |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1701 | { |
| 1702 | dma_addr_t offset = paddr & ~PAGE_MASK; |
Joerg Roedel | 53812c1 | 2009-05-12 12:17:38 +0200 | [diff] [blame] | 1703 | dma_addr_t address, start, ret; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1704 | unsigned int pages; |
Joerg Roedel | 6d4f343 | 2008-09-04 19:18:02 +0200 | [diff] [blame] | 1705 | unsigned long align_mask = 0; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1706 | int i; |
| 1707 | |
Joerg Roedel | e3c449f | 2008-10-15 22:02:11 -0700 | [diff] [blame] | 1708 | pages = iommu_num_pages(paddr, size, PAGE_SIZE); |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1709 | paddr &= PAGE_MASK; |
| 1710 | |
Joerg Roedel | 8ecaf8f | 2008-12-12 16:13:04 +0100 | [diff] [blame] | 1711 | INC_STATS_COUNTER(total_map_requests); |
| 1712 | |
Joerg Roedel | c185897 | 2008-12-12 15:42:39 +0100 | [diff] [blame] | 1713 | if (pages > 1) |
| 1714 | INC_STATS_COUNTER(cross_page); |
| 1715 | |
Joerg Roedel | 6d4f343 | 2008-09-04 19:18:02 +0200 | [diff] [blame] | 1716 | if (align) |
| 1717 | align_mask = (1UL << get_order(size)) - 1; |
| 1718 | |
Joerg Roedel | 11b8388 | 2009-05-19 10:23:15 +0200 | [diff] [blame] | 1719 | retry: |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1720 | address = dma_ops_alloc_addresses(dev, dma_dom, pages, align_mask, |
| 1721 | dma_mask); |
FUJITA Tomonori | 8fd524b | 2009-11-15 21:19:53 +0900 | [diff] [blame] | 1722 | if (unlikely(address == DMA_ERROR_CODE)) { |
Joerg Roedel | 11b8388 | 2009-05-19 10:23:15 +0200 | [diff] [blame] | 1723 | /* |
| 1724 | * setting next_address here will let the address |
| 1725 | * allocator only scan the new allocated range in the |
| 1726 | * first run. This is a small optimization. |
| 1727 | */ |
| 1728 | dma_dom->next_address = dma_dom->aperture_size; |
| 1729 | |
Joerg Roedel | 576175c | 2009-11-23 19:08:46 +0100 | [diff] [blame] | 1730 | if (alloc_new_range(dma_dom, false, GFP_ATOMIC)) |
Joerg Roedel | 11b8388 | 2009-05-19 10:23:15 +0200 | [diff] [blame] | 1731 | goto out; |
| 1732 | |
| 1733 | /* |
| 1734 | * aperture was sucessfully enlarged by 128 MB, try |
| 1735 | * allocation again |
| 1736 | */ |
| 1737 | goto retry; |
| 1738 | } |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1739 | |
| 1740 | start = address; |
| 1741 | for (i = 0; i < pages; ++i) { |
Joerg Roedel | 680525e | 2009-11-23 18:44:42 +0100 | [diff] [blame] | 1742 | ret = dma_ops_domain_map(dma_dom, start, paddr, dir); |
FUJITA Tomonori | 8fd524b | 2009-11-15 21:19:53 +0900 | [diff] [blame] | 1743 | if (ret == DMA_ERROR_CODE) |
Joerg Roedel | 53812c1 | 2009-05-12 12:17:38 +0200 | [diff] [blame] | 1744 | goto out_unmap; |
| 1745 | |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1746 | paddr += PAGE_SIZE; |
| 1747 | start += PAGE_SIZE; |
| 1748 | } |
| 1749 | address += offset; |
| 1750 | |
Joerg Roedel | 5774f7c | 2008-12-12 15:57:30 +0100 | [diff] [blame] | 1751 | ADD_STATS_COUNTER(alloced_io_mem, size); |
| 1752 | |
FUJITA Tomonori | afa9fdc | 2008-09-20 01:23:30 +0900 | [diff] [blame] | 1753 | if (unlikely(dma_dom->need_flush && !amd_iommu_unmap_flush)) { |
Joerg Roedel | dcd1e92 | 2009-11-20 15:30:58 +0100 | [diff] [blame] | 1754 | iommu_flush_tlb(&dma_dom->domain); |
Joerg Roedel | 1c65577 | 2008-09-04 18:40:05 +0200 | [diff] [blame] | 1755 | dma_dom->need_flush = false; |
Joerg Roedel | 318afd4 | 2009-11-23 18:32:38 +0100 | [diff] [blame] | 1756 | } else if (unlikely(amd_iommu_np_cache)) |
Joerg Roedel | 6de8ad9 | 2009-11-23 18:30:32 +0100 | [diff] [blame] | 1757 | iommu_flush_pages(&dma_dom->domain, address, size); |
Joerg Roedel | 270cab24 | 2008-09-04 15:49:46 +0200 | [diff] [blame] | 1758 | |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1759 | out: |
| 1760 | return address; |
Joerg Roedel | 53812c1 | 2009-05-12 12:17:38 +0200 | [diff] [blame] | 1761 | |
| 1762 | out_unmap: |
| 1763 | |
| 1764 | for (--i; i >= 0; --i) { |
| 1765 | start -= PAGE_SIZE; |
Joerg Roedel | 680525e | 2009-11-23 18:44:42 +0100 | [diff] [blame] | 1766 | dma_ops_domain_unmap(dma_dom, start); |
Joerg Roedel | 53812c1 | 2009-05-12 12:17:38 +0200 | [diff] [blame] | 1767 | } |
| 1768 | |
| 1769 | dma_ops_free_addresses(dma_dom, address, pages); |
| 1770 | |
FUJITA Tomonori | 8fd524b | 2009-11-15 21:19:53 +0900 | [diff] [blame] | 1771 | return DMA_ERROR_CODE; |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1772 | } |
| 1773 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1774 | /* |
| 1775 | * Does the reverse of the __map_single function. Must be called with |
| 1776 | * the domain lock held too |
| 1777 | */ |
Joerg Roedel | cd8c82e | 2009-11-23 19:33:56 +0100 | [diff] [blame] | 1778 | static void __unmap_single(struct dma_ops_domain *dma_dom, |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1779 | dma_addr_t dma_addr, |
| 1780 | size_t size, |
| 1781 | int dir) |
| 1782 | { |
| 1783 | dma_addr_t i, start; |
| 1784 | unsigned int pages; |
| 1785 | |
FUJITA Tomonori | 8fd524b | 2009-11-15 21:19:53 +0900 | [diff] [blame] | 1786 | if ((dma_addr == DMA_ERROR_CODE) || |
Joerg Roedel | b8d9905 | 2008-12-08 14:40:26 +0100 | [diff] [blame] | 1787 | (dma_addr + size > dma_dom->aperture_size)) |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1788 | return; |
| 1789 | |
Joerg Roedel | e3c449f | 2008-10-15 22:02:11 -0700 | [diff] [blame] | 1790 | pages = iommu_num_pages(dma_addr, size, PAGE_SIZE); |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1791 | dma_addr &= PAGE_MASK; |
| 1792 | start = dma_addr; |
| 1793 | |
| 1794 | for (i = 0; i < pages; ++i) { |
Joerg Roedel | 680525e | 2009-11-23 18:44:42 +0100 | [diff] [blame] | 1795 | dma_ops_domain_unmap(dma_dom, start); |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1796 | start += PAGE_SIZE; |
| 1797 | } |
| 1798 | |
Joerg Roedel | 5774f7c | 2008-12-12 15:57:30 +0100 | [diff] [blame] | 1799 | SUB_STATS_COUNTER(alloced_io_mem, size); |
| 1800 | |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1801 | dma_ops_free_addresses(dma_dom, dma_addr, pages); |
Joerg Roedel | 270cab24 | 2008-09-04 15:49:46 +0200 | [diff] [blame] | 1802 | |
Joerg Roedel | 80be308 | 2008-11-06 14:59:05 +0100 | [diff] [blame] | 1803 | if (amd_iommu_unmap_flush || dma_dom->need_flush) { |
Joerg Roedel | 6de8ad9 | 2009-11-23 18:30:32 +0100 | [diff] [blame] | 1804 | iommu_flush_pages(&dma_dom->domain, dma_addr, size); |
Joerg Roedel | 80be308 | 2008-11-06 14:59:05 +0100 | [diff] [blame] | 1805 | dma_dom->need_flush = false; |
| 1806 | } |
Joerg Roedel | cb76c32 | 2008-06-26 21:28:00 +0200 | [diff] [blame] | 1807 | } |
| 1808 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1809 | /* |
| 1810 | * The exported map_single function for dma_ops. |
| 1811 | */ |
FUJITA Tomonori | 5149136 | 2009-01-05 23:47:25 +0900 | [diff] [blame] | 1812 | static dma_addr_t map_page(struct device *dev, struct page *page, |
| 1813 | unsigned long offset, size_t size, |
| 1814 | enum dma_data_direction dir, |
| 1815 | struct dma_attrs *attrs) |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1816 | { |
| 1817 | unsigned long flags; |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1818 | struct protection_domain *domain; |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1819 | dma_addr_t addr; |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1820 | u64 dma_mask; |
FUJITA Tomonori | 5149136 | 2009-01-05 23:47:25 +0900 | [diff] [blame] | 1821 | phys_addr_t paddr = page_to_phys(page) + offset; |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1822 | |
Joerg Roedel | 0f2a86f | 2008-12-12 15:05:16 +0100 | [diff] [blame] | 1823 | INC_STATS_COUNTER(cnt_map_single); |
| 1824 | |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 1825 | domain = get_domain(dev); |
| 1826 | if (PTR_ERR(domain) == -EINVAL) |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1827 | return (dma_addr_t)paddr; |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 1828 | else if (IS_ERR(domain)) |
| 1829 | return DMA_ERROR_CODE; |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1830 | |
Joerg Roedel | f99c0f1 | 2009-11-23 16:52:56 +0100 | [diff] [blame] | 1831 | dma_mask = *dev->dma_mask; |
| 1832 | |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1833 | spin_lock_irqsave(&domain->lock, flags); |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 1834 | |
Joerg Roedel | cd8c82e | 2009-11-23 19:33:56 +0100 | [diff] [blame] | 1835 | addr = __map_single(dev, domain->priv, paddr, size, dir, false, |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1836 | dma_mask); |
FUJITA Tomonori | 8fd524b | 2009-11-15 21:19:53 +0900 | [diff] [blame] | 1837 | if (addr == DMA_ERROR_CODE) |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1838 | goto out; |
| 1839 | |
Joerg Roedel | 0518a3a | 2009-11-20 16:00:05 +0100 | [diff] [blame] | 1840 | iommu_flush_complete(domain); |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1841 | |
| 1842 | out: |
| 1843 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1844 | |
| 1845 | return addr; |
| 1846 | } |
| 1847 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1848 | /* |
| 1849 | * The exported unmap_single function for dma_ops. |
| 1850 | */ |
FUJITA Tomonori | 5149136 | 2009-01-05 23:47:25 +0900 | [diff] [blame] | 1851 | static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size, |
| 1852 | enum dma_data_direction dir, struct dma_attrs *attrs) |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1853 | { |
| 1854 | unsigned long flags; |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1855 | struct protection_domain *domain; |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1856 | |
Joerg Roedel | 146a691 | 2008-12-12 15:07:12 +0100 | [diff] [blame] | 1857 | INC_STATS_COUNTER(cnt_unmap_single); |
| 1858 | |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 1859 | domain = get_domain(dev); |
| 1860 | if (IS_ERR(domain)) |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1861 | return; |
| 1862 | |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1863 | spin_lock_irqsave(&domain->lock, flags); |
| 1864 | |
Joerg Roedel | cd8c82e | 2009-11-23 19:33:56 +0100 | [diff] [blame] | 1865 | __unmap_single(domain->priv, dma_addr, size, dir); |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1866 | |
Joerg Roedel | 0518a3a | 2009-11-20 16:00:05 +0100 | [diff] [blame] | 1867 | iommu_flush_complete(domain); |
Joerg Roedel | 4da70b9 | 2008-06-26 21:28:01 +0200 | [diff] [blame] | 1868 | |
| 1869 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1870 | } |
| 1871 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1872 | /* |
| 1873 | * This is a special map_sg function which is used if we should map a |
| 1874 | * device which is not handled by an AMD IOMMU in the system. |
| 1875 | */ |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1876 | static int map_sg_no_iommu(struct device *dev, struct scatterlist *sglist, |
| 1877 | int nelems, int dir) |
| 1878 | { |
| 1879 | struct scatterlist *s; |
| 1880 | int i; |
| 1881 | |
| 1882 | for_each_sg(sglist, s, nelems, i) { |
| 1883 | s->dma_address = (dma_addr_t)sg_phys(s); |
| 1884 | s->dma_length = s->length; |
| 1885 | } |
| 1886 | |
| 1887 | return nelems; |
| 1888 | } |
| 1889 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1890 | /* |
| 1891 | * The exported map_sg function for dma_ops (handles scatter-gather |
| 1892 | * lists). |
| 1893 | */ |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1894 | static int map_sg(struct device *dev, struct scatterlist *sglist, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 1895 | int nelems, enum dma_data_direction dir, |
| 1896 | struct dma_attrs *attrs) |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1897 | { |
| 1898 | unsigned long flags; |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1899 | struct protection_domain *domain; |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1900 | int i; |
| 1901 | struct scatterlist *s; |
| 1902 | phys_addr_t paddr; |
| 1903 | int mapped_elems = 0; |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1904 | u64 dma_mask; |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1905 | |
Joerg Roedel | d03f067a | 2008-12-12 15:09:48 +0100 | [diff] [blame] | 1906 | INC_STATS_COUNTER(cnt_map_sg); |
| 1907 | |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 1908 | domain = get_domain(dev); |
| 1909 | if (PTR_ERR(domain) == -EINVAL) |
Joerg Roedel | f99c0f1 | 2009-11-23 16:52:56 +0100 | [diff] [blame] | 1910 | return map_sg_no_iommu(dev, sglist, nelems, dir); |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 1911 | else if (IS_ERR(domain)) |
| 1912 | return 0; |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 1913 | |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1914 | dma_mask = *dev->dma_mask; |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1915 | |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1916 | spin_lock_irqsave(&domain->lock, flags); |
| 1917 | |
| 1918 | for_each_sg(sglist, s, nelems, i) { |
| 1919 | paddr = sg_phys(s); |
| 1920 | |
Joerg Roedel | cd8c82e | 2009-11-23 19:33:56 +0100 | [diff] [blame] | 1921 | s->dma_address = __map_single(dev, domain->priv, |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1922 | paddr, s->length, dir, false, |
| 1923 | dma_mask); |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1924 | |
| 1925 | if (s->dma_address) { |
| 1926 | s->dma_length = s->length; |
| 1927 | mapped_elems++; |
| 1928 | } else |
| 1929 | goto unmap; |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1930 | } |
| 1931 | |
Joerg Roedel | 0518a3a | 2009-11-20 16:00:05 +0100 | [diff] [blame] | 1932 | iommu_flush_complete(domain); |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1933 | |
| 1934 | out: |
| 1935 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1936 | |
| 1937 | return mapped_elems; |
| 1938 | unmap: |
| 1939 | for_each_sg(sglist, s, mapped_elems, i) { |
| 1940 | if (s->dma_address) |
Joerg Roedel | cd8c82e | 2009-11-23 19:33:56 +0100 | [diff] [blame] | 1941 | __unmap_single(domain->priv, s->dma_address, |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1942 | s->dma_length, dir); |
| 1943 | s->dma_address = s->dma_length = 0; |
| 1944 | } |
| 1945 | |
| 1946 | mapped_elems = 0; |
| 1947 | |
| 1948 | goto out; |
| 1949 | } |
| 1950 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1951 | /* |
| 1952 | * The exported map_sg function for dma_ops (handles scatter-gather |
| 1953 | * lists). |
| 1954 | */ |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1955 | static void unmap_sg(struct device *dev, struct scatterlist *sglist, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 1956 | int nelems, enum dma_data_direction dir, |
| 1957 | struct dma_attrs *attrs) |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1958 | { |
| 1959 | unsigned long flags; |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1960 | struct protection_domain *domain; |
| 1961 | struct scatterlist *s; |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1962 | int i; |
| 1963 | |
Joerg Roedel | 55877a6 | 2008-12-12 15:12:14 +0100 | [diff] [blame] | 1964 | INC_STATS_COUNTER(cnt_unmap_sg); |
| 1965 | |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 1966 | domain = get_domain(dev); |
| 1967 | if (IS_ERR(domain)) |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 1968 | return; |
| 1969 | |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1970 | spin_lock_irqsave(&domain->lock, flags); |
| 1971 | |
| 1972 | for_each_sg(sglist, s, nelems, i) { |
Joerg Roedel | cd8c82e | 2009-11-23 19:33:56 +0100 | [diff] [blame] | 1973 | __unmap_single(domain->priv, s->dma_address, |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1974 | s->dma_length, dir); |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1975 | s->dma_address = s->dma_length = 0; |
| 1976 | } |
| 1977 | |
Joerg Roedel | 0518a3a | 2009-11-20 16:00:05 +0100 | [diff] [blame] | 1978 | iommu_flush_complete(domain); |
Joerg Roedel | 65b050a | 2008-06-26 21:28:02 +0200 | [diff] [blame] | 1979 | |
| 1980 | spin_unlock_irqrestore(&domain->lock, flags); |
| 1981 | } |
| 1982 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 1983 | /* |
| 1984 | * The exported alloc_coherent function for dma_ops. |
| 1985 | */ |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1986 | static void *alloc_coherent(struct device *dev, size_t size, |
| 1987 | dma_addr_t *dma_addr, gfp_t flag) |
| 1988 | { |
| 1989 | unsigned long flags; |
| 1990 | void *virt_addr; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1991 | struct protection_domain *domain; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1992 | phys_addr_t paddr; |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 1993 | u64 dma_mask = dev->coherent_dma_mask; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 1994 | |
Joerg Roedel | c8f0fb3 | 2008-12-12 15:14:21 +0100 | [diff] [blame] | 1995 | INC_STATS_COUNTER(cnt_alloc_coherent); |
| 1996 | |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 1997 | domain = get_domain(dev); |
| 1998 | if (PTR_ERR(domain) == -EINVAL) { |
Joerg Roedel | f99c0f1 | 2009-11-23 16:52:56 +0100 | [diff] [blame] | 1999 | virt_addr = (void *)__get_free_pages(flag, get_order(size)); |
| 2000 | *dma_addr = __pa(virt_addr); |
| 2001 | return virt_addr; |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 2002 | } else if (IS_ERR(domain)) |
| 2003 | return NULL; |
Joerg Roedel | dbcc112 | 2008-09-04 15:04:26 +0200 | [diff] [blame] | 2004 | |
Joerg Roedel | f99c0f1 | 2009-11-23 16:52:56 +0100 | [diff] [blame] | 2005 | dma_mask = dev->coherent_dma_mask; |
| 2006 | flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32); |
| 2007 | flag |= __GFP_ZERO; |
FUJITA Tomonori | 13d9fea | 2008-09-10 20:19:40 +0900 | [diff] [blame] | 2008 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2009 | virt_addr = (void *)__get_free_pages(flag, get_order(size)); |
| 2010 | if (!virt_addr) |
Jaswinder Singh Rajput | b25ae67 | 2009-07-01 19:53:14 +0530 | [diff] [blame] | 2011 | return NULL; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2012 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2013 | paddr = virt_to_phys(virt_addr); |
| 2014 | |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 2015 | if (!dma_mask) |
| 2016 | dma_mask = *dev->dma_mask; |
| 2017 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2018 | spin_lock_irqsave(&domain->lock, flags); |
| 2019 | |
Joerg Roedel | cd8c82e | 2009-11-23 19:33:56 +0100 | [diff] [blame] | 2020 | *dma_addr = __map_single(dev, domain->priv, paddr, |
Joerg Roedel | 832a90c | 2008-09-18 15:54:23 +0200 | [diff] [blame] | 2021 | size, DMA_BIDIRECTIONAL, true, dma_mask); |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2022 | |
FUJITA Tomonori | 8fd524b | 2009-11-15 21:19:53 +0900 | [diff] [blame] | 2023 | if (*dma_addr == DMA_ERROR_CODE) { |
Jiri Slaby | 367d04c | 2009-05-28 09:54:48 +0200 | [diff] [blame] | 2024 | spin_unlock_irqrestore(&domain->lock, flags); |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 2025 | goto out_free; |
Jiri Slaby | 367d04c | 2009-05-28 09:54:48 +0200 | [diff] [blame] | 2026 | } |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2027 | |
Joerg Roedel | 0518a3a | 2009-11-20 16:00:05 +0100 | [diff] [blame] | 2028 | iommu_flush_complete(domain); |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2029 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2030 | spin_unlock_irqrestore(&domain->lock, flags); |
| 2031 | |
| 2032 | return virt_addr; |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 2033 | |
| 2034 | out_free: |
| 2035 | |
| 2036 | free_pages((unsigned long)virt_addr, get_order(size)); |
| 2037 | |
| 2038 | return NULL; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2039 | } |
| 2040 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 2041 | /* |
| 2042 | * The exported free_coherent function for dma_ops. |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 2043 | */ |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2044 | static void free_coherent(struct device *dev, size_t size, |
| 2045 | void *virt_addr, dma_addr_t dma_addr) |
| 2046 | { |
| 2047 | unsigned long flags; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2048 | struct protection_domain *domain; |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2049 | |
Joerg Roedel | 5d31ee7 | 2008-12-12 15:16:38 +0100 | [diff] [blame] | 2050 | INC_STATS_COUNTER(cnt_free_coherent); |
| 2051 | |
Joerg Roedel | 94f6d19 | 2009-11-24 16:40:02 +0100 | [diff] [blame] | 2052 | domain = get_domain(dev); |
| 2053 | if (IS_ERR(domain)) |
Joerg Roedel | 5b28df6 | 2008-12-02 17:49:42 +0100 | [diff] [blame] | 2054 | goto free_mem; |
| 2055 | |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2056 | spin_lock_irqsave(&domain->lock, flags); |
| 2057 | |
Joerg Roedel | cd8c82e | 2009-11-23 19:33:56 +0100 | [diff] [blame] | 2058 | __unmap_single(domain->priv, dma_addr, size, DMA_BIDIRECTIONAL); |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2059 | |
Joerg Roedel | 0518a3a | 2009-11-20 16:00:05 +0100 | [diff] [blame] | 2060 | iommu_flush_complete(domain); |
Joerg Roedel | 5d8b53c | 2008-06-26 21:28:03 +0200 | [diff] [blame] | 2061 | |
| 2062 | spin_unlock_irqrestore(&domain->lock, flags); |
| 2063 | |
| 2064 | free_mem: |
| 2065 | free_pages((unsigned long)virt_addr, get_order(size)); |
| 2066 | } |
| 2067 | |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 2068 | /* |
Joerg Roedel | b39ba6a | 2008-09-09 18:40:46 +0200 | [diff] [blame] | 2069 | * This function is called by the DMA layer to find out if we can handle a |
| 2070 | * particular device. It is part of the dma_ops. |
| 2071 | */ |
| 2072 | static int amd_iommu_dma_supported(struct device *dev, u64 mask) |
| 2073 | { |
Joerg Roedel | 420aef8 | 2009-11-23 16:14:57 +0100 | [diff] [blame] | 2074 | return check_device(dev); |
Joerg Roedel | b39ba6a | 2008-09-09 18:40:46 +0200 | [diff] [blame] | 2075 | } |
| 2076 | |
| 2077 | /* |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 2078 | * The function for pre-allocating protection domains. |
| 2079 | * |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 2080 | * If the driver core informs the DMA layer if a driver grabs a device |
| 2081 | * we don't need to preallocate the protection domains anymore. |
| 2082 | * For now we have to. |
| 2083 | */ |
Jaswinder Singh Rajput | 0e93dd8 | 2008-12-29 21:45:22 +0530 | [diff] [blame] | 2084 | static void prealloc_protection_domains(void) |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 2085 | { |
| 2086 | struct pci_dev *dev = NULL; |
| 2087 | struct dma_ops_domain *dma_dom; |
| 2088 | struct amd_iommu *iommu; |
Joerg Roedel | 98fc5a6 | 2009-11-24 17:19:23 +0100 | [diff] [blame^] | 2089 | u16 devid; |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 2090 | |
| 2091 | while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { |
Joerg Roedel | 98fc5a6 | 2009-11-24 17:19:23 +0100 | [diff] [blame^] | 2092 | |
| 2093 | /* Do we handle this device? */ |
| 2094 | if (!check_device(&dev->dev)) |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 2095 | continue; |
Joerg Roedel | 98fc5a6 | 2009-11-24 17:19:23 +0100 | [diff] [blame^] | 2096 | |
| 2097 | /* Is there already any domain for it? */ |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 2098 | if (domain_for_device(&dev->dev)) |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 2099 | continue; |
Joerg Roedel | 98fc5a6 | 2009-11-24 17:19:23 +0100 | [diff] [blame^] | 2100 | |
| 2101 | devid = get_device_id(&dev->dev); |
| 2102 | |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 2103 | iommu = amd_iommu_rlookup_table[devid]; |
| 2104 | if (!iommu) |
| 2105 | continue; |
Joerg Roedel | d9cfed9 | 2009-05-19 12:16:29 +0200 | [diff] [blame] | 2106 | dma_dom = dma_ops_domain_alloc(iommu); |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 2107 | if (!dma_dom) |
| 2108 | continue; |
| 2109 | init_unity_mappings_for_device(dma_dom, devid); |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 2110 | dma_dom->target_dev = devid; |
| 2111 | |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 2112 | attach_device(&dev->dev, &dma_dom->domain); |
Joerg Roedel | be83129 | 2009-11-23 12:50:00 +0100 | [diff] [blame] | 2113 | |
Joerg Roedel | bd60b73 | 2008-09-11 10:24:48 +0200 | [diff] [blame] | 2114 | list_add_tail(&dma_dom->list, &iommu_pd_list); |
Joerg Roedel | c432f3d | 2008-06-26 21:28:04 +0200 | [diff] [blame] | 2115 | } |
| 2116 | } |
| 2117 | |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 2118 | static struct dma_map_ops amd_iommu_dma_ops = { |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2119 | .alloc_coherent = alloc_coherent, |
| 2120 | .free_coherent = free_coherent, |
FUJITA Tomonori | 5149136 | 2009-01-05 23:47:25 +0900 | [diff] [blame] | 2121 | .map_page = map_page, |
| 2122 | .unmap_page = unmap_page, |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2123 | .map_sg = map_sg, |
| 2124 | .unmap_sg = unmap_sg, |
Joerg Roedel | b39ba6a | 2008-09-09 18:40:46 +0200 | [diff] [blame] | 2125 | .dma_supported = amd_iommu_dma_supported, |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2126 | }; |
| 2127 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 2128 | /* |
| 2129 | * The function which clues the AMD IOMMU driver into dma_ops. |
| 2130 | */ |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2131 | int __init amd_iommu_init_dma_ops(void) |
| 2132 | { |
| 2133 | struct amd_iommu *iommu; |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2134 | int ret; |
| 2135 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 2136 | /* |
| 2137 | * first allocate a default protection domain for every IOMMU we |
| 2138 | * found in the system. Devices not assigned to any other |
| 2139 | * protection domain will be assigned to the default one. |
| 2140 | */ |
Joerg Roedel | 3bd2217 | 2009-05-04 15:06:20 +0200 | [diff] [blame] | 2141 | for_each_iommu(iommu) { |
Joerg Roedel | d9cfed9 | 2009-05-19 12:16:29 +0200 | [diff] [blame] | 2142 | iommu->default_dom = dma_ops_domain_alloc(iommu); |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2143 | if (iommu->default_dom == NULL) |
| 2144 | return -ENOMEM; |
Joerg Roedel | e2dc14a | 2008-12-10 18:48:59 +0100 | [diff] [blame] | 2145 | iommu->default_dom->domain.flags |= PD_DEFAULT_MASK; |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2146 | ret = iommu_init_unity_mappings(iommu); |
| 2147 | if (ret) |
| 2148 | goto free_domains; |
| 2149 | } |
| 2150 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 2151 | /* |
| 2152 | * If device isolation is enabled, pre-allocate the protection |
| 2153 | * domains for each device. |
| 2154 | */ |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2155 | if (amd_iommu_isolate) |
| 2156 | prealloc_protection_domains(); |
| 2157 | |
| 2158 | iommu_detected = 1; |
FUJITA Tomonori | 75f1cdf | 2009-11-10 19:46:20 +0900 | [diff] [blame] | 2159 | swiotlb = 0; |
Ingo Molnar | 92af4e2 | 2008-06-27 10:48:16 +0200 | [diff] [blame] | 2160 | #ifdef CONFIG_GART_IOMMU |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2161 | gart_iommu_aperture_disabled = 1; |
| 2162 | gart_iommu_aperture = 0; |
Ingo Molnar | 92af4e2 | 2008-06-27 10:48:16 +0200 | [diff] [blame] | 2163 | #endif |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2164 | |
Joerg Roedel | 431b2a2 | 2008-07-11 17:14:22 +0200 | [diff] [blame] | 2165 | /* Make the driver finally visible to the drivers */ |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2166 | dma_ops = &amd_iommu_dma_ops; |
| 2167 | |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 2168 | register_iommu(&amd_iommu_ops); |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 2169 | |
Joerg Roedel | e275a2a | 2008-12-10 18:27:25 +0100 | [diff] [blame] | 2170 | bus_register_notifier(&pci_bus_type, &device_nb); |
| 2171 | |
Joerg Roedel | 7f26508 | 2008-12-12 13:50:21 +0100 | [diff] [blame] | 2172 | amd_iommu_stats_init(); |
| 2173 | |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2174 | return 0; |
| 2175 | |
| 2176 | free_domains: |
| 2177 | |
Joerg Roedel | 3bd2217 | 2009-05-04 15:06:20 +0200 | [diff] [blame] | 2178 | for_each_iommu(iommu) { |
Joerg Roedel | 6631ee9 | 2008-06-26 21:28:05 +0200 | [diff] [blame] | 2179 | if (iommu->default_dom) |
| 2180 | dma_ops_domain_free(iommu->default_dom); |
| 2181 | } |
| 2182 | |
| 2183 | return ret; |
| 2184 | } |
Joerg Roedel | 6d98cd8 | 2008-12-08 12:05:55 +0100 | [diff] [blame] | 2185 | |
| 2186 | /***************************************************************************** |
| 2187 | * |
| 2188 | * The following functions belong to the exported interface of AMD IOMMU |
| 2189 | * |
| 2190 | * This interface allows access to lower level functions of the IOMMU |
| 2191 | * like protection domain handling and assignement of devices to domains |
| 2192 | * which is not possible with the dma_ops interface. |
| 2193 | * |
| 2194 | *****************************************************************************/ |
| 2195 | |
Joerg Roedel | 6d98cd8 | 2008-12-08 12:05:55 +0100 | [diff] [blame] | 2196 | static void cleanup_domain(struct protection_domain *domain) |
| 2197 | { |
| 2198 | unsigned long flags; |
| 2199 | u16 devid; |
| 2200 | |
| 2201 | write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 2202 | |
| 2203 | for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) |
| 2204 | if (amd_iommu_pd_table[devid] == domain) |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 2205 | clear_dte_entry(devid); |
Joerg Roedel | 6d98cd8 | 2008-12-08 12:05:55 +0100 | [diff] [blame] | 2206 | |
| 2207 | write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| 2208 | } |
| 2209 | |
Joerg Roedel | 2650815 | 2009-08-26 16:52:40 +0200 | [diff] [blame] | 2210 | static void protection_domain_free(struct protection_domain *domain) |
| 2211 | { |
| 2212 | if (!domain) |
| 2213 | return; |
| 2214 | |
Joerg Roedel | aeb26f5 | 2009-11-20 16:44:01 +0100 | [diff] [blame] | 2215 | del_domain_from_list(domain); |
| 2216 | |
Joerg Roedel | 2650815 | 2009-08-26 16:52:40 +0200 | [diff] [blame] | 2217 | if (domain->id) |
| 2218 | domain_id_free(domain->id); |
| 2219 | |
| 2220 | kfree(domain); |
| 2221 | } |
| 2222 | |
| 2223 | static struct protection_domain *protection_domain_alloc(void) |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 2224 | { |
| 2225 | struct protection_domain *domain; |
| 2226 | |
| 2227 | domain = kzalloc(sizeof(*domain), GFP_KERNEL); |
| 2228 | if (!domain) |
Joerg Roedel | 2650815 | 2009-08-26 16:52:40 +0200 | [diff] [blame] | 2229 | return NULL; |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 2230 | |
| 2231 | spin_lock_init(&domain->lock); |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 2232 | domain->id = domain_id_alloc(); |
| 2233 | if (!domain->id) |
Joerg Roedel | 2650815 | 2009-08-26 16:52:40 +0200 | [diff] [blame] | 2234 | goto out_err; |
| 2235 | |
Joerg Roedel | aeb26f5 | 2009-11-20 16:44:01 +0100 | [diff] [blame] | 2236 | add_domain_to_list(domain); |
| 2237 | |
Joerg Roedel | 2650815 | 2009-08-26 16:52:40 +0200 | [diff] [blame] | 2238 | return domain; |
| 2239 | |
| 2240 | out_err: |
| 2241 | kfree(domain); |
| 2242 | |
| 2243 | return NULL; |
| 2244 | } |
| 2245 | |
| 2246 | static int amd_iommu_domain_init(struct iommu_domain *dom) |
| 2247 | { |
| 2248 | struct protection_domain *domain; |
| 2249 | |
| 2250 | domain = protection_domain_alloc(); |
| 2251 | if (!domain) |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 2252 | goto out_free; |
Joerg Roedel | 2650815 | 2009-08-26 16:52:40 +0200 | [diff] [blame] | 2253 | |
| 2254 | domain->mode = PAGE_MODE_3_LEVEL; |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 2255 | domain->pt_root = (void *)get_zeroed_page(GFP_KERNEL); |
| 2256 | if (!domain->pt_root) |
| 2257 | goto out_free; |
| 2258 | |
| 2259 | dom->priv = domain; |
| 2260 | |
| 2261 | return 0; |
| 2262 | |
| 2263 | out_free: |
Joerg Roedel | 2650815 | 2009-08-26 16:52:40 +0200 | [diff] [blame] | 2264 | protection_domain_free(domain); |
Joerg Roedel | c156e34 | 2008-12-02 18:13:27 +0100 | [diff] [blame] | 2265 | |
| 2266 | return -ENOMEM; |
| 2267 | } |
| 2268 | |
Joerg Roedel | 98383fc | 2008-12-02 18:34:12 +0100 | [diff] [blame] | 2269 | static void amd_iommu_domain_destroy(struct iommu_domain *dom) |
| 2270 | { |
| 2271 | struct protection_domain *domain = dom->priv; |
| 2272 | |
| 2273 | if (!domain) |
| 2274 | return; |
| 2275 | |
| 2276 | if (domain->dev_cnt > 0) |
| 2277 | cleanup_domain(domain); |
| 2278 | |
| 2279 | BUG_ON(domain->dev_cnt != 0); |
| 2280 | |
| 2281 | free_pagetable(domain); |
| 2282 | |
| 2283 | domain_id_free(domain->id); |
| 2284 | |
| 2285 | kfree(domain); |
| 2286 | |
| 2287 | dom->priv = NULL; |
| 2288 | } |
| 2289 | |
Joerg Roedel | 684f288 | 2008-12-08 12:07:44 +0100 | [diff] [blame] | 2290 | static void amd_iommu_detach_device(struct iommu_domain *dom, |
| 2291 | struct device *dev) |
| 2292 | { |
Joerg Roedel | 684f288 | 2008-12-08 12:07:44 +0100 | [diff] [blame] | 2293 | struct amd_iommu *iommu; |
Joerg Roedel | 684f288 | 2008-12-08 12:07:44 +0100 | [diff] [blame] | 2294 | u16 devid; |
| 2295 | |
Joerg Roedel | 98fc5a6 | 2009-11-24 17:19:23 +0100 | [diff] [blame^] | 2296 | if (!check_device(dev)) |
Joerg Roedel | 684f288 | 2008-12-08 12:07:44 +0100 | [diff] [blame] | 2297 | return; |
| 2298 | |
Joerg Roedel | 98fc5a6 | 2009-11-24 17:19:23 +0100 | [diff] [blame^] | 2299 | devid = get_device_id(dev); |
Joerg Roedel | 684f288 | 2008-12-08 12:07:44 +0100 | [diff] [blame] | 2300 | |
Joerg Roedel | 98fc5a6 | 2009-11-24 17:19:23 +0100 | [diff] [blame^] | 2301 | if (amd_iommu_pd_table[devid] != NULL) |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 2302 | detach_device(dev); |
Joerg Roedel | 684f288 | 2008-12-08 12:07:44 +0100 | [diff] [blame] | 2303 | |
| 2304 | iommu = amd_iommu_rlookup_table[devid]; |
| 2305 | if (!iommu) |
| 2306 | return; |
| 2307 | |
| 2308 | iommu_queue_inv_dev_entry(iommu, devid); |
| 2309 | iommu_completion_wait(iommu); |
| 2310 | } |
| 2311 | |
Joerg Roedel | 0110606 | 2008-12-02 19:34:11 +0100 | [diff] [blame] | 2312 | static int amd_iommu_attach_device(struct iommu_domain *dom, |
| 2313 | struct device *dev) |
| 2314 | { |
| 2315 | struct protection_domain *domain = dom->priv; |
| 2316 | struct protection_domain *old_domain; |
| 2317 | struct amd_iommu *iommu; |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 2318 | int ret; |
Joerg Roedel | 0110606 | 2008-12-02 19:34:11 +0100 | [diff] [blame] | 2319 | u16 devid; |
| 2320 | |
Joerg Roedel | 98fc5a6 | 2009-11-24 17:19:23 +0100 | [diff] [blame^] | 2321 | if (!check_device(dev)) |
Joerg Roedel | 0110606 | 2008-12-02 19:34:11 +0100 | [diff] [blame] | 2322 | return -EINVAL; |
| 2323 | |
Joerg Roedel | 98fc5a6 | 2009-11-24 17:19:23 +0100 | [diff] [blame^] | 2324 | devid = get_device_id(dev); |
Joerg Roedel | 0110606 | 2008-12-02 19:34:11 +0100 | [diff] [blame] | 2325 | |
| 2326 | iommu = amd_iommu_rlookup_table[devid]; |
| 2327 | if (!iommu) |
| 2328 | return -EINVAL; |
| 2329 | |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 2330 | old_domain = amd_iommu_pd_table[devid]; |
Joerg Roedel | 0110606 | 2008-12-02 19:34:11 +0100 | [diff] [blame] | 2331 | if (old_domain) |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 2332 | detach_device(dev); |
Joerg Roedel | 0110606 | 2008-12-02 19:34:11 +0100 | [diff] [blame] | 2333 | |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 2334 | ret = attach_device(dev, domain); |
Joerg Roedel | 0110606 | 2008-12-02 19:34:11 +0100 | [diff] [blame] | 2335 | |
| 2336 | iommu_completion_wait(iommu); |
| 2337 | |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 2338 | return ret; |
Joerg Roedel | 0110606 | 2008-12-02 19:34:11 +0100 | [diff] [blame] | 2339 | } |
| 2340 | |
Joerg Roedel | c6229ca | 2008-12-02 19:48:43 +0100 | [diff] [blame] | 2341 | static int amd_iommu_map_range(struct iommu_domain *dom, |
| 2342 | unsigned long iova, phys_addr_t paddr, |
| 2343 | size_t size, int iommu_prot) |
| 2344 | { |
| 2345 | struct protection_domain *domain = dom->priv; |
| 2346 | unsigned long i, npages = iommu_num_pages(paddr, size, PAGE_SIZE); |
| 2347 | int prot = 0; |
| 2348 | int ret; |
| 2349 | |
| 2350 | if (iommu_prot & IOMMU_READ) |
| 2351 | prot |= IOMMU_PROT_IR; |
| 2352 | if (iommu_prot & IOMMU_WRITE) |
| 2353 | prot |= IOMMU_PROT_IW; |
| 2354 | |
| 2355 | iova &= PAGE_MASK; |
| 2356 | paddr &= PAGE_MASK; |
| 2357 | |
| 2358 | for (i = 0; i < npages; ++i) { |
Joerg Roedel | abdc5eb | 2009-09-03 11:33:51 +0200 | [diff] [blame] | 2359 | ret = iommu_map_page(domain, iova, paddr, prot, PM_MAP_4k); |
Joerg Roedel | c6229ca | 2008-12-02 19:48:43 +0100 | [diff] [blame] | 2360 | if (ret) |
| 2361 | return ret; |
| 2362 | |
| 2363 | iova += PAGE_SIZE; |
| 2364 | paddr += PAGE_SIZE; |
| 2365 | } |
| 2366 | |
| 2367 | return 0; |
| 2368 | } |
| 2369 | |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 2370 | static void amd_iommu_unmap_range(struct iommu_domain *dom, |
| 2371 | unsigned long iova, size_t size) |
| 2372 | { |
| 2373 | |
| 2374 | struct protection_domain *domain = dom->priv; |
| 2375 | unsigned long i, npages = iommu_num_pages(iova, size, PAGE_SIZE); |
| 2376 | |
| 2377 | iova &= PAGE_MASK; |
| 2378 | |
| 2379 | for (i = 0; i < npages; ++i) { |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 2380 | iommu_unmap_page(domain, iova, PM_MAP_4k); |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 2381 | iova += PAGE_SIZE; |
| 2382 | } |
| 2383 | |
Joerg Roedel | 601367d | 2009-11-20 16:08:55 +0100 | [diff] [blame] | 2384 | iommu_flush_tlb_pde(domain); |
Joerg Roedel | eb74ff6 | 2008-12-02 19:59:10 +0100 | [diff] [blame] | 2385 | } |
| 2386 | |
Joerg Roedel | 645c4c8 | 2008-12-02 20:05:50 +0100 | [diff] [blame] | 2387 | static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom, |
| 2388 | unsigned long iova) |
| 2389 | { |
| 2390 | struct protection_domain *domain = dom->priv; |
| 2391 | unsigned long offset = iova & ~PAGE_MASK; |
| 2392 | phys_addr_t paddr; |
| 2393 | u64 *pte; |
| 2394 | |
Joerg Roedel | a6b256b | 2009-09-03 12:21:31 +0200 | [diff] [blame] | 2395 | pte = fetch_pte(domain, iova, PM_MAP_4k); |
Joerg Roedel | 645c4c8 | 2008-12-02 20:05:50 +0100 | [diff] [blame] | 2396 | |
Joerg Roedel | a6d41a4 | 2009-09-02 17:08:55 +0200 | [diff] [blame] | 2397 | if (!pte || !IOMMU_PTE_PRESENT(*pte)) |
Joerg Roedel | 645c4c8 | 2008-12-02 20:05:50 +0100 | [diff] [blame] | 2398 | return 0; |
| 2399 | |
| 2400 | paddr = *pte & IOMMU_PAGE_MASK; |
| 2401 | paddr |= offset; |
| 2402 | |
| 2403 | return paddr; |
| 2404 | } |
| 2405 | |
Sheng Yang | dbb9fd8 | 2009-03-18 15:33:06 +0800 | [diff] [blame] | 2406 | static int amd_iommu_domain_has_cap(struct iommu_domain *domain, |
| 2407 | unsigned long cap) |
| 2408 | { |
| 2409 | return 0; |
| 2410 | } |
| 2411 | |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 2412 | static struct iommu_ops amd_iommu_ops = { |
| 2413 | .domain_init = amd_iommu_domain_init, |
| 2414 | .domain_destroy = amd_iommu_domain_destroy, |
| 2415 | .attach_dev = amd_iommu_attach_device, |
| 2416 | .detach_dev = amd_iommu_detach_device, |
| 2417 | .map = amd_iommu_map_range, |
| 2418 | .unmap = amd_iommu_unmap_range, |
| 2419 | .iova_to_phys = amd_iommu_iova_to_phys, |
Sheng Yang | dbb9fd8 | 2009-03-18 15:33:06 +0800 | [diff] [blame] | 2420 | .domain_has_cap = amd_iommu_domain_has_cap, |
Joerg Roedel | 26961ef | 2008-12-03 17:00:17 +0100 | [diff] [blame] | 2421 | }; |
| 2422 | |
Joerg Roedel | 0feae53 | 2009-08-26 15:26:30 +0200 | [diff] [blame] | 2423 | /***************************************************************************** |
| 2424 | * |
| 2425 | * The next functions do a basic initialization of IOMMU for pass through |
| 2426 | * mode |
| 2427 | * |
| 2428 | * In passthrough mode the IOMMU is initialized and enabled but not used for |
| 2429 | * DMA-API translation. |
| 2430 | * |
| 2431 | *****************************************************************************/ |
| 2432 | |
| 2433 | int __init amd_iommu_init_passthrough(void) |
| 2434 | { |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 2435 | struct amd_iommu *iommu; |
Joerg Roedel | 0feae53 | 2009-08-26 15:26:30 +0200 | [diff] [blame] | 2436 | struct pci_dev *dev = NULL; |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 2437 | u16 devid; |
Joerg Roedel | 0feae53 | 2009-08-26 15:26:30 +0200 | [diff] [blame] | 2438 | |
| 2439 | /* allocate passthroug domain */ |
| 2440 | pt_domain = protection_domain_alloc(); |
| 2441 | if (!pt_domain) |
| 2442 | return -ENOMEM; |
| 2443 | |
| 2444 | pt_domain->mode |= PAGE_MODE_NONE; |
| 2445 | |
| 2446 | while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { |
Joerg Roedel | 0feae53 | 2009-08-26 15:26:30 +0200 | [diff] [blame] | 2447 | |
Joerg Roedel | 98fc5a6 | 2009-11-24 17:19:23 +0100 | [diff] [blame^] | 2448 | if (!check_device(&dev->dev)) |
Joerg Roedel | 0feae53 | 2009-08-26 15:26:30 +0200 | [diff] [blame] | 2449 | continue; |
| 2450 | |
Joerg Roedel | 98fc5a6 | 2009-11-24 17:19:23 +0100 | [diff] [blame^] | 2451 | devid = get_device_id(&dev->dev); |
| 2452 | |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 2453 | iommu = amd_iommu_rlookup_table[devid]; |
Joerg Roedel | 0feae53 | 2009-08-26 15:26:30 +0200 | [diff] [blame] | 2454 | if (!iommu) |
| 2455 | continue; |
| 2456 | |
Joerg Roedel | 15898bb | 2009-11-24 15:39:42 +0100 | [diff] [blame] | 2457 | attach_device(&dev->dev, pt_domain); |
Joerg Roedel | 0feae53 | 2009-08-26 15:26:30 +0200 | [diff] [blame] | 2458 | } |
| 2459 | |
| 2460 | pr_info("AMD-Vi: Initialized for Passthrough Mode\n"); |
| 2461 | |
| 2462 | return 0; |
| 2463 | } |