Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010-2012 Advanced Micro Devices, Inc. |
Joerg Roedel | 63ce3ae | 2015-02-04 16:12:55 +0100 | [diff] [blame] | 3 | * Author: Joerg Roedel <jroedel@suse.de> |
Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 as published |
| 7 | * by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 17 | */ |
| 18 | |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 19 | #include <linux/mmu_notifier.h> |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 20 | #include <linux/amd-iommu.h> |
| 21 | #include <linux/mm_types.h> |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 22 | #include <linux/profile.h> |
Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 23 | #include <linux/module.h> |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 24 | #include <linux/sched.h> |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 25 | #include <linux/iommu.h> |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 26 | #include <linux/wait.h> |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 27 | #include <linux/pci.h> |
| 28 | #include <linux/gfp.h> |
| 29 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 30 | #include "amd_iommu_types.h" |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 31 | #include "amd_iommu_proto.h" |
Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 32 | |
| 33 | MODULE_LICENSE("GPL v2"); |
Joerg Roedel | 63ce3ae | 2015-02-04 16:12:55 +0100 | [diff] [blame] | 34 | MODULE_AUTHOR("Joerg Roedel <jroedel@suse.de>"); |
Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 35 | |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 36 | #define MAX_DEVICES 0x10000 |
| 37 | #define PRI_QUEUE_SIZE 512 |
| 38 | |
| 39 | struct pri_queue { |
| 40 | atomic_t inflight; |
| 41 | bool finish; |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 42 | int status; |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 43 | }; |
| 44 | |
| 45 | struct pasid_state { |
| 46 | struct list_head list; /* For global state-list */ |
| 47 | atomic_t count; /* Reference count */ |
Joerg Roedel | d73a6d7 | 2014-06-20 16:14:22 +0200 | [diff] [blame] | 48 | unsigned mmu_notifier_count; /* Counting nested mmu_notifier |
Joerg Roedel | e79df31 | 2014-05-20 23:18:26 +0200 | [diff] [blame] | 49 | calls */ |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 50 | struct mm_struct *mm; /* mm_struct for the faults */ |
Joerg Roedel | ff6d0cc | 2014-07-08 12:49:50 +0200 | [diff] [blame] | 51 | struct mmu_notifier mn; /* mmu_notifier handle */ |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 52 | struct pri_queue pri[PRI_QUEUE_SIZE]; /* PRI tag states */ |
| 53 | struct device_state *device_state; /* Link to our device_state */ |
| 54 | int pasid; /* PASID index */ |
Joerg Roedel | d9e1611 | 2014-07-09 15:43:11 +0200 | [diff] [blame] | 55 | bool invalid; /* Used during setup and |
| 56 | teardown of the pasid */ |
Joerg Roedel | d73a6d7 | 2014-06-20 16:14:22 +0200 | [diff] [blame] | 57 | spinlock_t lock; /* Protect pri_queues and |
| 58 | mmu_notifer_count */ |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 59 | wait_queue_head_t wq; /* To wait for count == 0 */ |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 60 | }; |
| 61 | |
| 62 | struct device_state { |
Joerg Roedel | 741669c | 2014-05-20 23:18:23 +0200 | [diff] [blame] | 63 | struct list_head list; |
| 64 | u16 devid; |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 65 | atomic_t count; |
| 66 | struct pci_dev *pdev; |
| 67 | struct pasid_state **states; |
| 68 | struct iommu_domain *domain; |
| 69 | int pasid_levels; |
| 70 | int max_pasids; |
Joerg Roedel | 175d614 | 2011-11-28 14:36:36 +0100 | [diff] [blame] | 71 | amd_iommu_invalid_ppr_cb inv_ppr_cb; |
Joerg Roedel | bc21662 | 2011-12-07 12:24:42 +0100 | [diff] [blame] | 72 | amd_iommu_invalidate_ctx inv_ctx_cb; |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 73 | spinlock_t lock; |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 74 | wait_queue_head_t wq; |
| 75 | }; |
| 76 | |
| 77 | struct fault { |
| 78 | struct work_struct work; |
| 79 | struct device_state *dev_state; |
| 80 | struct pasid_state *state; |
| 81 | struct mm_struct *mm; |
| 82 | u64 address; |
| 83 | u16 devid; |
| 84 | u16 pasid; |
| 85 | u16 tag; |
| 86 | u16 finish; |
| 87 | u16 flags; |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 88 | }; |
| 89 | |
Joerg Roedel | 741669c | 2014-05-20 23:18:23 +0200 | [diff] [blame] | 90 | static LIST_HEAD(state_list); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 91 | static spinlock_t state_lock; |
| 92 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 93 | static struct workqueue_struct *iommu_wq; |
| 94 | |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 95 | static void free_pasid_states(struct device_state *dev_state); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 96 | |
| 97 | static u16 device_id(struct pci_dev *pdev) |
| 98 | { |
| 99 | u16 devid; |
| 100 | |
| 101 | devid = pdev->bus->number; |
| 102 | devid = (devid << 8) | pdev->devfn; |
| 103 | |
| 104 | return devid; |
| 105 | } |
| 106 | |
Joerg Roedel | b87d2d7 | 2014-05-20 23:18:22 +0200 | [diff] [blame] | 107 | static struct device_state *__get_device_state(u16 devid) |
| 108 | { |
Joerg Roedel | 741669c | 2014-05-20 23:18:23 +0200 | [diff] [blame] | 109 | struct device_state *dev_state; |
| 110 | |
| 111 | list_for_each_entry(dev_state, &state_list, list) { |
| 112 | if (dev_state->devid == devid) |
| 113 | return dev_state; |
| 114 | } |
| 115 | |
| 116 | return NULL; |
Joerg Roedel | b87d2d7 | 2014-05-20 23:18:22 +0200 | [diff] [blame] | 117 | } |
| 118 | |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 119 | static struct device_state *get_device_state(u16 devid) |
| 120 | { |
| 121 | struct device_state *dev_state; |
| 122 | unsigned long flags; |
| 123 | |
| 124 | spin_lock_irqsave(&state_lock, flags); |
Joerg Roedel | b87d2d7 | 2014-05-20 23:18:22 +0200 | [diff] [blame] | 125 | dev_state = __get_device_state(devid); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 126 | if (dev_state != NULL) |
| 127 | atomic_inc(&dev_state->count); |
| 128 | spin_unlock_irqrestore(&state_lock, flags); |
| 129 | |
| 130 | return dev_state; |
| 131 | } |
| 132 | |
| 133 | static void free_device_state(struct device_state *dev_state) |
| 134 | { |
Joerg Roedel | 55c99a4 | 2015-07-28 16:58:47 +0200 | [diff] [blame] | 135 | struct iommu_group *group; |
| 136 | |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 137 | /* |
| 138 | * First detach device from domain - No more PRI requests will arrive |
| 139 | * from that device after it is unbound from the IOMMUv2 domain. |
| 140 | */ |
Joerg Roedel | 55c99a4 | 2015-07-28 16:58:47 +0200 | [diff] [blame] | 141 | group = iommu_group_get(&dev_state->pdev->dev); |
| 142 | if (WARN_ON(!group)) |
| 143 | return; |
| 144 | |
| 145 | iommu_detach_group(dev_state->domain, group); |
| 146 | |
| 147 | iommu_group_put(group); |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 148 | |
| 149 | /* Everything is down now, free the IOMMUv2 domain */ |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 150 | iommu_domain_free(dev_state->domain); |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 151 | |
| 152 | /* Finally get rid of the device-state */ |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 153 | kfree(dev_state); |
| 154 | } |
| 155 | |
| 156 | static void put_device_state(struct device_state *dev_state) |
| 157 | { |
| 158 | if (atomic_dec_and_test(&dev_state->count)) |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 159 | wake_up(&dev_state->wq); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 160 | } |
| 161 | |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 162 | /* Must be called under dev_state->lock */ |
| 163 | static struct pasid_state **__get_pasid_state_ptr(struct device_state *dev_state, |
| 164 | int pasid, bool alloc) |
| 165 | { |
| 166 | struct pasid_state **root, **ptr; |
| 167 | int level, index; |
| 168 | |
| 169 | level = dev_state->pasid_levels; |
| 170 | root = dev_state->states; |
| 171 | |
| 172 | while (true) { |
| 173 | |
| 174 | index = (pasid >> (9 * level)) & 0x1ff; |
| 175 | ptr = &root[index]; |
| 176 | |
| 177 | if (level == 0) |
| 178 | break; |
| 179 | |
| 180 | if (*ptr == NULL) { |
| 181 | if (!alloc) |
| 182 | return NULL; |
| 183 | |
| 184 | *ptr = (void *)get_zeroed_page(GFP_ATOMIC); |
| 185 | if (*ptr == NULL) |
| 186 | return NULL; |
| 187 | } |
| 188 | |
| 189 | root = (struct pasid_state **)*ptr; |
| 190 | level -= 1; |
| 191 | } |
| 192 | |
| 193 | return ptr; |
| 194 | } |
| 195 | |
| 196 | static int set_pasid_state(struct device_state *dev_state, |
| 197 | struct pasid_state *pasid_state, |
| 198 | int pasid) |
| 199 | { |
| 200 | struct pasid_state **ptr; |
| 201 | unsigned long flags; |
| 202 | int ret; |
| 203 | |
| 204 | spin_lock_irqsave(&dev_state->lock, flags); |
| 205 | ptr = __get_pasid_state_ptr(dev_state, pasid, true); |
| 206 | |
| 207 | ret = -ENOMEM; |
| 208 | if (ptr == NULL) |
| 209 | goto out_unlock; |
| 210 | |
| 211 | ret = -ENOMEM; |
| 212 | if (*ptr != NULL) |
| 213 | goto out_unlock; |
| 214 | |
| 215 | *ptr = pasid_state; |
| 216 | |
| 217 | ret = 0; |
| 218 | |
| 219 | out_unlock: |
| 220 | spin_unlock_irqrestore(&dev_state->lock, flags); |
| 221 | |
| 222 | return ret; |
| 223 | } |
| 224 | |
| 225 | static void clear_pasid_state(struct device_state *dev_state, int pasid) |
| 226 | { |
| 227 | struct pasid_state **ptr; |
| 228 | unsigned long flags; |
| 229 | |
| 230 | spin_lock_irqsave(&dev_state->lock, flags); |
| 231 | ptr = __get_pasid_state_ptr(dev_state, pasid, true); |
| 232 | |
| 233 | if (ptr == NULL) |
| 234 | goto out_unlock; |
| 235 | |
| 236 | *ptr = NULL; |
| 237 | |
| 238 | out_unlock: |
| 239 | spin_unlock_irqrestore(&dev_state->lock, flags); |
| 240 | } |
| 241 | |
| 242 | static struct pasid_state *get_pasid_state(struct device_state *dev_state, |
| 243 | int pasid) |
| 244 | { |
| 245 | struct pasid_state **ptr, *ret = NULL; |
| 246 | unsigned long flags; |
| 247 | |
| 248 | spin_lock_irqsave(&dev_state->lock, flags); |
| 249 | ptr = __get_pasid_state_ptr(dev_state, pasid, false); |
| 250 | |
| 251 | if (ptr == NULL) |
| 252 | goto out_unlock; |
| 253 | |
| 254 | ret = *ptr; |
| 255 | if (ret) |
| 256 | atomic_inc(&ret->count); |
| 257 | |
| 258 | out_unlock: |
| 259 | spin_unlock_irqrestore(&dev_state->lock, flags); |
| 260 | |
| 261 | return ret; |
| 262 | } |
| 263 | |
| 264 | static void free_pasid_state(struct pasid_state *pasid_state) |
| 265 | { |
| 266 | kfree(pasid_state); |
| 267 | } |
| 268 | |
| 269 | static void put_pasid_state(struct pasid_state *pasid_state) |
| 270 | { |
Oded Gabbay | 1c51099 | 2014-11-10 12:21:39 +0200 | [diff] [blame] | 271 | if (atomic_dec_and_test(&pasid_state->count)) |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 272 | wake_up(&pasid_state->wq); |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 273 | } |
| 274 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 275 | static void put_pasid_state_wait(struct pasid_state *pasid_state) |
| 276 | { |
Oded Gabbay | 1bf1b43 | 2015-04-16 17:08:44 +0300 | [diff] [blame] | 277 | atomic_dec(&pasid_state->count); |
Joerg Roedel | a1bec06 | 2015-02-04 15:50:38 +0100 | [diff] [blame] | 278 | wait_event(pasid_state->wq, !atomic_read(&pasid_state->count)); |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 279 | free_pasid_state(pasid_state); |
| 280 | } |
| 281 | |
Joerg Roedel | 61feb43 | 2014-07-08 14:19:35 +0200 | [diff] [blame] | 282 | static void unbind_pasid(struct pasid_state *pasid_state) |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 283 | { |
| 284 | struct iommu_domain *domain; |
| 285 | |
| 286 | domain = pasid_state->device_state->domain; |
| 287 | |
Joerg Roedel | 53d340e | 2014-07-08 15:01:43 +0200 | [diff] [blame] | 288 | /* |
| 289 | * Mark pasid_state as invalid, no more faults will we added to the |
| 290 | * work queue after this is visible everywhere. |
| 291 | */ |
| 292 | pasid_state->invalid = true; |
| 293 | |
| 294 | /* Make sure this is visible */ |
| 295 | smp_wmb(); |
| 296 | |
| 297 | /* After this the device/pasid can't access the mm anymore */ |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 298 | amd_iommu_domain_clear_gcr3(domain, pasid_state->pasid); |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 299 | |
| 300 | /* Make sure no more pending faults are in the queue */ |
| 301 | flush_workqueue(iommu_wq); |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 302 | } |
| 303 | |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 304 | static void free_pasid_states_level1(struct pasid_state **tbl) |
| 305 | { |
| 306 | int i; |
| 307 | |
| 308 | for (i = 0; i < 512; ++i) { |
| 309 | if (tbl[i] == NULL) |
| 310 | continue; |
| 311 | |
| 312 | free_page((unsigned long)tbl[i]); |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | static void free_pasid_states_level2(struct pasid_state **tbl) |
| 317 | { |
| 318 | struct pasid_state **ptr; |
| 319 | int i; |
| 320 | |
| 321 | for (i = 0; i < 512; ++i) { |
| 322 | if (tbl[i] == NULL) |
| 323 | continue; |
| 324 | |
| 325 | ptr = (struct pasid_state **)tbl[i]; |
| 326 | free_pasid_states_level1(ptr); |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | static void free_pasid_states(struct device_state *dev_state) |
| 331 | { |
| 332 | struct pasid_state *pasid_state; |
| 333 | int i; |
| 334 | |
| 335 | for (i = 0; i < dev_state->max_pasids; ++i) { |
| 336 | pasid_state = get_pasid_state(dev_state, i); |
| 337 | if (pasid_state == NULL) |
| 338 | continue; |
| 339 | |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 340 | put_pasid_state(pasid_state); |
Joerg Roedel | a40d4c6 | 2014-05-20 23:18:24 +0200 | [diff] [blame] | 341 | |
| 342 | /* |
| 343 | * This will call the mn_release function and |
| 344 | * unbind the PASID |
| 345 | */ |
| 346 | mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm); |
Joerg Roedel | c5db16a | 2014-07-08 14:15:45 +0200 | [diff] [blame] | 347 | |
| 348 | put_pasid_state_wait(pasid_state); /* Reference taken in |
Joerg Roedel | daff2f9 | 2014-07-30 16:04:40 +0200 | [diff] [blame] | 349 | amd_iommu_bind_pasid */ |
Joerg Roedel | 75058a3 | 2014-07-30 16:04:39 +0200 | [diff] [blame] | 350 | |
| 351 | /* Drop reference taken in amd_iommu_bind_pasid */ |
| 352 | put_device_state(dev_state); |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 353 | } |
| 354 | |
| 355 | if (dev_state->pasid_levels == 2) |
| 356 | free_pasid_states_level2(dev_state->states); |
| 357 | else if (dev_state->pasid_levels == 1) |
| 358 | free_pasid_states_level1(dev_state->states); |
Joerg Roedel | 23d3a98 | 2015-08-13 11:15:13 +0200 | [diff] [blame] | 359 | else |
| 360 | BUG_ON(dev_state->pasid_levels != 0); |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 361 | |
| 362 | free_page((unsigned long)dev_state->states); |
| 363 | } |
| 364 | |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 365 | static struct pasid_state *mn_to_state(struct mmu_notifier *mn) |
| 366 | { |
| 367 | return container_of(mn, struct pasid_state, mn); |
| 368 | } |
| 369 | |
| 370 | static void __mn_flush_page(struct mmu_notifier *mn, |
| 371 | unsigned long address) |
| 372 | { |
| 373 | struct pasid_state *pasid_state; |
| 374 | struct device_state *dev_state; |
| 375 | |
| 376 | pasid_state = mn_to_state(mn); |
| 377 | dev_state = pasid_state->device_state; |
| 378 | |
| 379 | amd_iommu_flush_page(dev_state->domain, pasid_state->pasid, address); |
| 380 | } |
| 381 | |
| 382 | static int mn_clear_flush_young(struct mmu_notifier *mn, |
| 383 | struct mm_struct *mm, |
Andres Lagar-Cavilla | 5712846 | 2014-09-22 14:54:42 -0700 | [diff] [blame] | 384 | unsigned long start, |
| 385 | unsigned long end) |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 386 | { |
Andres Lagar-Cavilla | 5712846 | 2014-09-22 14:54:42 -0700 | [diff] [blame] | 387 | for (; start < end; start += PAGE_SIZE) |
| 388 | __mn_flush_page(mn, start); |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 389 | |
| 390 | return 0; |
| 391 | } |
| 392 | |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 393 | static void mn_invalidate_page(struct mmu_notifier *mn, |
| 394 | struct mm_struct *mm, |
| 395 | unsigned long address) |
| 396 | { |
| 397 | __mn_flush_page(mn, address); |
| 398 | } |
| 399 | |
Joerg Roedel | e7cc3dd | 2014-11-13 13:46:09 +1100 | [diff] [blame] | 400 | static void mn_invalidate_range(struct mmu_notifier *mn, |
| 401 | struct mm_struct *mm, |
| 402 | unsigned long start, unsigned long end) |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 403 | { |
| 404 | struct pasid_state *pasid_state; |
| 405 | struct device_state *dev_state; |
| 406 | |
| 407 | pasid_state = mn_to_state(mn); |
| 408 | dev_state = pasid_state->device_state; |
| 409 | |
Joerg Roedel | e7cc3dd | 2014-11-13 13:46:09 +1100 | [diff] [blame] | 410 | if ((start ^ (end - 1)) < PAGE_SIZE) |
| 411 | amd_iommu_flush_page(dev_state->domain, pasid_state->pasid, |
| 412 | start); |
| 413 | else |
| 414 | amd_iommu_flush_tlb(dev_state->domain, pasid_state->pasid); |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 415 | } |
| 416 | |
Joerg Roedel | a40d4c6 | 2014-05-20 23:18:24 +0200 | [diff] [blame] | 417 | static void mn_release(struct mmu_notifier *mn, struct mm_struct *mm) |
| 418 | { |
| 419 | struct pasid_state *pasid_state; |
| 420 | struct device_state *dev_state; |
Joerg Roedel | d9e1611 | 2014-07-09 15:43:11 +0200 | [diff] [blame] | 421 | bool run_inv_ctx_cb; |
Joerg Roedel | a40d4c6 | 2014-05-20 23:18:24 +0200 | [diff] [blame] | 422 | |
| 423 | might_sleep(); |
| 424 | |
Joerg Roedel | d9e1611 | 2014-07-09 15:43:11 +0200 | [diff] [blame] | 425 | pasid_state = mn_to_state(mn); |
| 426 | dev_state = pasid_state->device_state; |
| 427 | run_inv_ctx_cb = !pasid_state->invalid; |
Joerg Roedel | a40d4c6 | 2014-05-20 23:18:24 +0200 | [diff] [blame] | 428 | |
Dan Carpenter | 940f700 | 2015-02-20 13:52:01 +0300 | [diff] [blame] | 429 | if (run_inv_ctx_cb && dev_state->inv_ctx_cb) |
Joerg Roedel | a40d4c6 | 2014-05-20 23:18:24 +0200 | [diff] [blame] | 430 | dev_state->inv_ctx_cb(dev_state->pdev, pasid_state->pasid); |
| 431 | |
Joerg Roedel | 61feb43 | 2014-07-08 14:19:35 +0200 | [diff] [blame] | 432 | unbind_pasid(pasid_state); |
Joerg Roedel | a40d4c6 | 2014-05-20 23:18:24 +0200 | [diff] [blame] | 433 | } |
| 434 | |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 435 | static struct mmu_notifier_ops iommu_mn = { |
Joerg Roedel | a40d4c6 | 2014-05-20 23:18:24 +0200 | [diff] [blame] | 436 | .release = mn_release, |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 437 | .clear_flush_young = mn_clear_flush_young, |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 438 | .invalidate_page = mn_invalidate_page, |
Joerg Roedel | e7cc3dd | 2014-11-13 13:46:09 +1100 | [diff] [blame] | 439 | .invalidate_range = mn_invalidate_range, |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 440 | }; |
| 441 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 442 | static void set_pri_tag_status(struct pasid_state *pasid_state, |
| 443 | u16 tag, int status) |
| 444 | { |
| 445 | unsigned long flags; |
| 446 | |
| 447 | spin_lock_irqsave(&pasid_state->lock, flags); |
| 448 | pasid_state->pri[tag].status = status; |
| 449 | spin_unlock_irqrestore(&pasid_state->lock, flags); |
| 450 | } |
| 451 | |
| 452 | static void finish_pri_tag(struct device_state *dev_state, |
| 453 | struct pasid_state *pasid_state, |
| 454 | u16 tag) |
| 455 | { |
| 456 | unsigned long flags; |
| 457 | |
| 458 | spin_lock_irqsave(&pasid_state->lock, flags); |
| 459 | if (atomic_dec_and_test(&pasid_state->pri[tag].inflight) && |
| 460 | pasid_state->pri[tag].finish) { |
| 461 | amd_iommu_complete_ppr(dev_state->pdev, pasid_state->pasid, |
| 462 | pasid_state->pri[tag].status, tag); |
| 463 | pasid_state->pri[tag].finish = false; |
| 464 | pasid_state->pri[tag].status = PPR_SUCCESS; |
| 465 | } |
| 466 | spin_unlock_irqrestore(&pasid_state->lock, flags); |
| 467 | } |
| 468 | |
Jesse Barnes | 9dc00f4 | 2014-12-12 16:55:30 -0800 | [diff] [blame] | 469 | static void handle_fault_error(struct fault *fault) |
| 470 | { |
| 471 | int status; |
| 472 | |
| 473 | if (!fault->dev_state->inv_ppr_cb) { |
| 474 | set_pri_tag_status(fault->state, fault->tag, PPR_INVALID); |
| 475 | return; |
| 476 | } |
| 477 | |
| 478 | status = fault->dev_state->inv_ppr_cb(fault->dev_state->pdev, |
| 479 | fault->pasid, |
| 480 | fault->address, |
| 481 | fault->flags); |
| 482 | switch (status) { |
| 483 | case AMD_IOMMU_INV_PRI_RSP_SUCCESS: |
| 484 | set_pri_tag_status(fault->state, fault->tag, PPR_SUCCESS); |
| 485 | break; |
| 486 | case AMD_IOMMU_INV_PRI_RSP_INVALID: |
| 487 | set_pri_tag_status(fault->state, fault->tag, PPR_INVALID); |
| 488 | break; |
| 489 | case AMD_IOMMU_INV_PRI_RSP_FAIL: |
| 490 | set_pri_tag_status(fault->state, fault->tag, PPR_FAILURE); |
| 491 | break; |
| 492 | default: |
| 493 | BUG(); |
| 494 | } |
| 495 | } |
| 496 | |
Joerg Roedel | 7b5cc1a | 2015-11-17 16:11:36 +0100 | [diff] [blame] | 497 | static bool access_error(struct vm_area_struct *vma, struct fault *fault) |
| 498 | { |
| 499 | unsigned long requested = 0; |
| 500 | |
| 501 | if (fault->flags & PPR_FAULT_EXEC) |
| 502 | requested |= VM_EXEC; |
| 503 | |
| 504 | if (fault->flags & PPR_FAULT_READ) |
| 505 | requested |= VM_READ; |
| 506 | |
| 507 | if (fault->flags & PPR_FAULT_WRITE) |
| 508 | requested |= VM_WRITE; |
| 509 | |
| 510 | return (requested & ~vma->vm_flags) != 0; |
| 511 | } |
| 512 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 513 | static void do_fault(struct work_struct *work) |
| 514 | { |
| 515 | struct fault *fault = container_of(work, struct fault, work); |
Jesse Barnes | 9dc00f4 | 2014-12-12 16:55:30 -0800 | [diff] [blame] | 516 | struct vm_area_struct *vma; |
Joerg Roedel | 492e745 | 2015-11-17 16:11:38 +0100 | [diff] [blame^] | 517 | int ret = VM_FAULT_ERROR; |
Joerg Roedel | 43c0ea2 | 2015-11-17 16:11:37 +0100 | [diff] [blame] | 518 | unsigned int flags = 0; |
| 519 | struct mm_struct *mm; |
Jesse Barnes | 9dc00f4 | 2014-12-12 16:55:30 -0800 | [diff] [blame] | 520 | u64 address; |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 521 | |
Jesse Barnes | 9dc00f4 | 2014-12-12 16:55:30 -0800 | [diff] [blame] | 522 | mm = fault->state->mm; |
| 523 | address = fault->address; |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 524 | |
Joerg Roedel | 43c0ea2 | 2015-11-17 16:11:37 +0100 | [diff] [blame] | 525 | if (fault->flags & PPR_FAULT_USER) |
| 526 | flags |= FAULT_FLAG_USER; |
| 527 | if (fault->flags & PPR_FAULT_WRITE) |
| 528 | flags |= FAULT_FLAG_WRITE; |
| 529 | |
Jesse Barnes | 9dc00f4 | 2014-12-12 16:55:30 -0800 | [diff] [blame] | 530 | down_read(&mm->mmap_sem); |
| 531 | vma = find_extend_vma(mm, address); |
Joerg Roedel | 492e745 | 2015-11-17 16:11:38 +0100 | [diff] [blame^] | 532 | if (!vma || address < vma->vm_start) |
Jesse Barnes | 9dc00f4 | 2014-12-12 16:55:30 -0800 | [diff] [blame] | 533 | /* failed to get a vma in the right range */ |
Jesse Barnes | 9dc00f4 | 2014-12-12 16:55:30 -0800 | [diff] [blame] | 534 | goto out; |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 535 | |
Joerg Roedel | 7b5cc1a | 2015-11-17 16:11:36 +0100 | [diff] [blame] | 536 | /* Check if we have the right permissions on the vma */ |
Joerg Roedel | 492e745 | 2015-11-17 16:11:38 +0100 | [diff] [blame^] | 537 | if (access_error(vma, fault)) |
Jay Cornwall | d14f6fc | 2015-09-16 14:10:03 -0500 | [diff] [blame] | 538 | goto out; |
Jay Cornwall | d14f6fc | 2015-09-16 14:10:03 -0500 | [diff] [blame] | 539 | |
Joerg Roedel | 43c0ea2 | 2015-11-17 16:11:37 +0100 | [diff] [blame] | 540 | ret = handle_mm_fault(mm, vma, address, flags); |
Jesse Barnes | 9dc00f4 | 2014-12-12 16:55:30 -0800 | [diff] [blame] | 541 | |
| 542 | out: |
Joerg Roedel | 492e745 | 2015-11-17 16:11:38 +0100 | [diff] [blame^] | 543 | up_read(&mm->mmap_sem); |
| 544 | |
| 545 | if (ret & VM_FAULT_ERROR) |
| 546 | /* failed to service fault */ |
| 547 | handle_fault_error(fault); |
| 548 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 549 | finish_pri_tag(fault->dev_state, fault->state, fault->tag); |
| 550 | |
| 551 | put_pasid_state(fault->state); |
| 552 | |
| 553 | kfree(fault); |
| 554 | } |
| 555 | |
| 556 | static int ppr_notifier(struct notifier_block *nb, unsigned long e, void *data) |
| 557 | { |
| 558 | struct amd_iommu_fault *iommu_fault; |
| 559 | struct pasid_state *pasid_state; |
| 560 | struct device_state *dev_state; |
| 561 | unsigned long flags; |
| 562 | struct fault *fault; |
| 563 | bool finish; |
| 564 | u16 tag; |
| 565 | int ret; |
| 566 | |
| 567 | iommu_fault = data; |
| 568 | tag = iommu_fault->tag & 0x1ff; |
| 569 | finish = (iommu_fault->tag >> 9) & 1; |
| 570 | |
| 571 | ret = NOTIFY_DONE; |
| 572 | dev_state = get_device_state(iommu_fault->device_id); |
| 573 | if (dev_state == NULL) |
| 574 | goto out; |
| 575 | |
| 576 | pasid_state = get_pasid_state(dev_state, iommu_fault->pasid); |
Joerg Roedel | 53d340e | 2014-07-08 15:01:43 +0200 | [diff] [blame] | 577 | if (pasid_state == NULL || pasid_state->invalid) { |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 578 | /* We know the device but not the PASID -> send INVALID */ |
| 579 | amd_iommu_complete_ppr(dev_state->pdev, iommu_fault->pasid, |
| 580 | PPR_INVALID, tag); |
| 581 | goto out_drop_state; |
| 582 | } |
| 583 | |
| 584 | spin_lock_irqsave(&pasid_state->lock, flags); |
| 585 | atomic_inc(&pasid_state->pri[tag].inflight); |
| 586 | if (finish) |
| 587 | pasid_state->pri[tag].finish = true; |
| 588 | spin_unlock_irqrestore(&pasid_state->lock, flags); |
| 589 | |
| 590 | fault = kzalloc(sizeof(*fault), GFP_ATOMIC); |
| 591 | if (fault == NULL) { |
| 592 | /* We are OOM - send success and let the device re-fault */ |
| 593 | finish_pri_tag(dev_state, pasid_state, tag); |
| 594 | goto out_drop_state; |
| 595 | } |
| 596 | |
| 597 | fault->dev_state = dev_state; |
| 598 | fault->address = iommu_fault->address; |
| 599 | fault->state = pasid_state; |
| 600 | fault->tag = tag; |
| 601 | fault->finish = finish; |
Alexey Skidanov | b00675b | 2014-07-08 17:30:16 +0300 | [diff] [blame] | 602 | fault->pasid = iommu_fault->pasid; |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 603 | fault->flags = iommu_fault->flags; |
| 604 | INIT_WORK(&fault->work, do_fault); |
| 605 | |
| 606 | queue_work(iommu_wq, &fault->work); |
| 607 | |
| 608 | ret = NOTIFY_OK; |
| 609 | |
| 610 | out_drop_state: |
Joerg Roedel | dc88db7 | 2014-07-08 14:55:10 +0200 | [diff] [blame] | 611 | |
| 612 | if (ret != NOTIFY_OK && pasid_state) |
| 613 | put_pasid_state(pasid_state); |
| 614 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 615 | put_device_state(dev_state); |
| 616 | |
| 617 | out: |
| 618 | return ret; |
| 619 | } |
| 620 | |
| 621 | static struct notifier_block ppr_nb = { |
| 622 | .notifier_call = ppr_notifier, |
| 623 | }; |
| 624 | |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 625 | int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid, |
| 626 | struct task_struct *task) |
| 627 | { |
| 628 | struct pasid_state *pasid_state; |
| 629 | struct device_state *dev_state; |
Joerg Roedel | f0aac63 | 2014-07-08 15:15:07 +0200 | [diff] [blame] | 630 | struct mm_struct *mm; |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 631 | u16 devid; |
| 632 | int ret; |
| 633 | |
| 634 | might_sleep(); |
| 635 | |
| 636 | if (!amd_iommu_v2_supported()) |
| 637 | return -ENODEV; |
| 638 | |
| 639 | devid = device_id(pdev); |
| 640 | dev_state = get_device_state(devid); |
| 641 | |
| 642 | if (dev_state == NULL) |
| 643 | return -EINVAL; |
| 644 | |
| 645 | ret = -EINVAL; |
| 646 | if (pasid < 0 || pasid >= dev_state->max_pasids) |
| 647 | goto out; |
| 648 | |
| 649 | ret = -ENOMEM; |
| 650 | pasid_state = kzalloc(sizeof(*pasid_state), GFP_KERNEL); |
| 651 | if (pasid_state == NULL) |
| 652 | goto out; |
| 653 | |
Joerg Roedel | f0aac63 | 2014-07-08 15:15:07 +0200 | [diff] [blame] | 654 | |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 655 | atomic_set(&pasid_state->count, 1); |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 656 | init_waitqueue_head(&pasid_state->wq); |
Joerg Roedel | 2c13d47 | 2012-07-19 10:56:10 +0200 | [diff] [blame] | 657 | spin_lock_init(&pasid_state->lock); |
| 658 | |
Joerg Roedel | f0aac63 | 2014-07-08 15:15:07 +0200 | [diff] [blame] | 659 | mm = get_task_mm(task); |
Joerg Roedel | f0aac63 | 2014-07-08 15:15:07 +0200 | [diff] [blame] | 660 | pasid_state->mm = mm; |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 661 | pasid_state->device_state = dev_state; |
| 662 | pasid_state->pasid = pasid; |
Joerg Roedel | d9e1611 | 2014-07-09 15:43:11 +0200 | [diff] [blame] | 663 | pasid_state->invalid = true; /* Mark as valid only if we are |
| 664 | done with setting up the pasid */ |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 665 | pasid_state->mn.ops = &iommu_mn; |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 666 | |
| 667 | if (pasid_state->mm == NULL) |
| 668 | goto out_free; |
| 669 | |
Joerg Roedel | f0aac63 | 2014-07-08 15:15:07 +0200 | [diff] [blame] | 670 | mmu_notifier_register(&pasid_state->mn, mm); |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 671 | |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 672 | ret = set_pasid_state(dev_state, pasid_state, pasid); |
| 673 | if (ret) |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 674 | goto out_unregister; |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 675 | |
| 676 | ret = amd_iommu_domain_set_gcr3(dev_state->domain, pasid, |
| 677 | __pa(pasid_state->mm->pgd)); |
| 678 | if (ret) |
| 679 | goto out_clear_state; |
| 680 | |
Joerg Roedel | d9e1611 | 2014-07-09 15:43:11 +0200 | [diff] [blame] | 681 | /* Now we are ready to handle faults */ |
| 682 | pasid_state->invalid = false; |
| 683 | |
Joerg Roedel | f0aac63 | 2014-07-08 15:15:07 +0200 | [diff] [blame] | 684 | /* |
| 685 | * Drop the reference to the mm_struct here. We rely on the |
| 686 | * mmu_notifier release call-back to inform us when the mm |
| 687 | * is going away. |
| 688 | */ |
| 689 | mmput(mm); |
| 690 | |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 691 | return 0; |
| 692 | |
| 693 | out_clear_state: |
| 694 | clear_pasid_state(dev_state, pasid); |
| 695 | |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 696 | out_unregister: |
Joerg Roedel | f0aac63 | 2014-07-08 15:15:07 +0200 | [diff] [blame] | 697 | mmu_notifier_unregister(&pasid_state->mn, mm); |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 698 | |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 699 | out_free: |
Joerg Roedel | f0aac63 | 2014-07-08 15:15:07 +0200 | [diff] [blame] | 700 | mmput(mm); |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 701 | free_pasid_state(pasid_state); |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 702 | |
| 703 | out: |
| 704 | put_device_state(dev_state); |
| 705 | |
| 706 | return ret; |
| 707 | } |
| 708 | EXPORT_SYMBOL(amd_iommu_bind_pasid); |
| 709 | |
| 710 | void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid) |
| 711 | { |
Joerg Roedel | a40d4c6 | 2014-05-20 23:18:24 +0200 | [diff] [blame] | 712 | struct pasid_state *pasid_state; |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 713 | struct device_state *dev_state; |
| 714 | u16 devid; |
| 715 | |
| 716 | might_sleep(); |
| 717 | |
| 718 | if (!amd_iommu_v2_supported()) |
| 719 | return; |
| 720 | |
| 721 | devid = device_id(pdev); |
| 722 | dev_state = get_device_state(devid); |
| 723 | if (dev_state == NULL) |
| 724 | return; |
| 725 | |
| 726 | if (pasid < 0 || pasid >= dev_state->max_pasids) |
| 727 | goto out; |
| 728 | |
Joerg Roedel | a40d4c6 | 2014-05-20 23:18:24 +0200 | [diff] [blame] | 729 | pasid_state = get_pasid_state(dev_state, pasid); |
| 730 | if (pasid_state == NULL) |
| 731 | goto out; |
| 732 | /* |
| 733 | * Drop reference taken here. We are safe because we still hold |
| 734 | * the reference taken in the amd_iommu_bind_pasid function. |
| 735 | */ |
| 736 | put_pasid_state(pasid_state); |
| 737 | |
Joerg Roedel | 53d340e | 2014-07-08 15:01:43 +0200 | [diff] [blame] | 738 | /* Clear the pasid state so that the pasid can be re-used */ |
| 739 | clear_pasid_state(dev_state, pasid_state->pasid); |
| 740 | |
Joerg Roedel | f0aac63 | 2014-07-08 15:15:07 +0200 | [diff] [blame] | 741 | /* |
Joerg Roedel | fcaa960 | 2014-07-30 16:04:37 +0200 | [diff] [blame] | 742 | * Call mmu_notifier_unregister to drop our reference |
| 743 | * to pasid_state->mm |
Joerg Roedel | f0aac63 | 2014-07-08 15:15:07 +0200 | [diff] [blame] | 744 | */ |
Joerg Roedel | fcaa960 | 2014-07-30 16:04:37 +0200 | [diff] [blame] | 745 | mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm); |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 746 | |
Joerg Roedel | c5db16a | 2014-07-08 14:15:45 +0200 | [diff] [blame] | 747 | put_pasid_state_wait(pasid_state); /* Reference taken in |
Joerg Roedel | daff2f9 | 2014-07-30 16:04:40 +0200 | [diff] [blame] | 748 | amd_iommu_bind_pasid */ |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 749 | out: |
Joerg Roedel | 75058a3 | 2014-07-30 16:04:39 +0200 | [diff] [blame] | 750 | /* Drop reference taken in this function */ |
| 751 | put_device_state(dev_state); |
| 752 | |
| 753 | /* Drop reference taken in amd_iommu_bind_pasid */ |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 754 | put_device_state(dev_state); |
| 755 | } |
| 756 | EXPORT_SYMBOL(amd_iommu_unbind_pasid); |
| 757 | |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 758 | int amd_iommu_init_device(struct pci_dev *pdev, int pasids) |
| 759 | { |
| 760 | struct device_state *dev_state; |
Joerg Roedel | 55c99a4 | 2015-07-28 16:58:47 +0200 | [diff] [blame] | 761 | struct iommu_group *group; |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 762 | unsigned long flags; |
| 763 | int ret, tmp; |
| 764 | u16 devid; |
| 765 | |
| 766 | might_sleep(); |
| 767 | |
| 768 | if (!amd_iommu_v2_supported()) |
| 769 | return -ENODEV; |
| 770 | |
| 771 | if (pasids <= 0 || pasids > (PASID_MASK + 1)) |
| 772 | return -EINVAL; |
| 773 | |
| 774 | devid = device_id(pdev); |
| 775 | |
| 776 | dev_state = kzalloc(sizeof(*dev_state), GFP_KERNEL); |
| 777 | if (dev_state == NULL) |
| 778 | return -ENOMEM; |
| 779 | |
| 780 | spin_lock_init(&dev_state->lock); |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 781 | init_waitqueue_head(&dev_state->wq); |
Joerg Roedel | 741669c | 2014-05-20 23:18:23 +0200 | [diff] [blame] | 782 | dev_state->pdev = pdev; |
| 783 | dev_state->devid = devid; |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 784 | |
| 785 | tmp = pasids; |
| 786 | for (dev_state->pasid_levels = 0; (tmp - 1) & ~0x1ff; tmp >>= 9) |
| 787 | dev_state->pasid_levels += 1; |
| 788 | |
| 789 | atomic_set(&dev_state->count, 1); |
| 790 | dev_state->max_pasids = pasids; |
| 791 | |
| 792 | ret = -ENOMEM; |
| 793 | dev_state->states = (void *)get_zeroed_page(GFP_KERNEL); |
| 794 | if (dev_state->states == NULL) |
| 795 | goto out_free_dev_state; |
| 796 | |
| 797 | dev_state->domain = iommu_domain_alloc(&pci_bus_type); |
| 798 | if (dev_state->domain == NULL) |
| 799 | goto out_free_states; |
| 800 | |
| 801 | amd_iommu_domain_direct_map(dev_state->domain); |
| 802 | |
| 803 | ret = amd_iommu_domain_enable_v2(dev_state->domain, pasids); |
| 804 | if (ret) |
| 805 | goto out_free_domain; |
| 806 | |
Joerg Roedel | 55c99a4 | 2015-07-28 16:58:47 +0200 | [diff] [blame] | 807 | group = iommu_group_get(&pdev->dev); |
| 808 | if (!group) |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 809 | goto out_free_domain; |
| 810 | |
Joerg Roedel | 55c99a4 | 2015-07-28 16:58:47 +0200 | [diff] [blame] | 811 | ret = iommu_attach_group(dev_state->domain, group); |
| 812 | if (ret != 0) |
| 813 | goto out_drop_group; |
| 814 | |
| 815 | iommu_group_put(group); |
| 816 | |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 817 | spin_lock_irqsave(&state_lock, flags); |
| 818 | |
Joerg Roedel | 741669c | 2014-05-20 23:18:23 +0200 | [diff] [blame] | 819 | if (__get_device_state(devid) != NULL) { |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 820 | spin_unlock_irqrestore(&state_lock, flags); |
| 821 | ret = -EBUSY; |
| 822 | goto out_free_domain; |
| 823 | } |
| 824 | |
Joerg Roedel | 741669c | 2014-05-20 23:18:23 +0200 | [diff] [blame] | 825 | list_add_tail(&dev_state->list, &state_list); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 826 | |
| 827 | spin_unlock_irqrestore(&state_lock, flags); |
| 828 | |
| 829 | return 0; |
| 830 | |
Joerg Roedel | 55c99a4 | 2015-07-28 16:58:47 +0200 | [diff] [blame] | 831 | out_drop_group: |
| 832 | iommu_group_put(group); |
| 833 | |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 834 | out_free_domain: |
| 835 | iommu_domain_free(dev_state->domain); |
| 836 | |
| 837 | out_free_states: |
| 838 | free_page((unsigned long)dev_state->states); |
| 839 | |
| 840 | out_free_dev_state: |
| 841 | kfree(dev_state); |
| 842 | |
| 843 | return ret; |
| 844 | } |
| 845 | EXPORT_SYMBOL(amd_iommu_init_device); |
| 846 | |
| 847 | void amd_iommu_free_device(struct pci_dev *pdev) |
| 848 | { |
| 849 | struct device_state *dev_state; |
| 850 | unsigned long flags; |
| 851 | u16 devid; |
| 852 | |
| 853 | if (!amd_iommu_v2_supported()) |
| 854 | return; |
| 855 | |
| 856 | devid = device_id(pdev); |
| 857 | |
| 858 | spin_lock_irqsave(&state_lock, flags); |
| 859 | |
Joerg Roedel | b87d2d7 | 2014-05-20 23:18:22 +0200 | [diff] [blame] | 860 | dev_state = __get_device_state(devid); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 861 | if (dev_state == NULL) { |
| 862 | spin_unlock_irqrestore(&state_lock, flags); |
| 863 | return; |
| 864 | } |
| 865 | |
Joerg Roedel | 741669c | 2014-05-20 23:18:23 +0200 | [diff] [blame] | 866 | list_del(&dev_state->list); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 867 | |
| 868 | spin_unlock_irqrestore(&state_lock, flags); |
| 869 | |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 870 | /* Get rid of any remaining pasid states */ |
| 871 | free_pasid_states(dev_state); |
| 872 | |
Peter Zijlstra | 91f65fa | 2015-02-03 13:25:51 +0100 | [diff] [blame] | 873 | put_device_state(dev_state); |
| 874 | /* |
| 875 | * Wait until the last reference is dropped before freeing |
| 876 | * the device state. |
| 877 | */ |
| 878 | wait_event(dev_state->wq, !atomic_read(&dev_state->count)); |
| 879 | free_device_state(dev_state); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 880 | } |
| 881 | EXPORT_SYMBOL(amd_iommu_free_device); |
| 882 | |
Joerg Roedel | 175d614 | 2011-11-28 14:36:36 +0100 | [diff] [blame] | 883 | int amd_iommu_set_invalid_ppr_cb(struct pci_dev *pdev, |
| 884 | amd_iommu_invalid_ppr_cb cb) |
| 885 | { |
| 886 | struct device_state *dev_state; |
| 887 | unsigned long flags; |
| 888 | u16 devid; |
| 889 | int ret; |
| 890 | |
| 891 | if (!amd_iommu_v2_supported()) |
| 892 | return -ENODEV; |
| 893 | |
| 894 | devid = device_id(pdev); |
| 895 | |
| 896 | spin_lock_irqsave(&state_lock, flags); |
| 897 | |
| 898 | ret = -EINVAL; |
Joerg Roedel | b87d2d7 | 2014-05-20 23:18:22 +0200 | [diff] [blame] | 899 | dev_state = __get_device_state(devid); |
Joerg Roedel | 175d614 | 2011-11-28 14:36:36 +0100 | [diff] [blame] | 900 | if (dev_state == NULL) |
| 901 | goto out_unlock; |
| 902 | |
| 903 | dev_state->inv_ppr_cb = cb; |
| 904 | |
| 905 | ret = 0; |
| 906 | |
| 907 | out_unlock: |
| 908 | spin_unlock_irqrestore(&state_lock, flags); |
| 909 | |
| 910 | return ret; |
| 911 | } |
| 912 | EXPORT_SYMBOL(amd_iommu_set_invalid_ppr_cb); |
| 913 | |
Joerg Roedel | bc21662 | 2011-12-07 12:24:42 +0100 | [diff] [blame] | 914 | int amd_iommu_set_invalidate_ctx_cb(struct pci_dev *pdev, |
| 915 | amd_iommu_invalidate_ctx cb) |
| 916 | { |
| 917 | struct device_state *dev_state; |
| 918 | unsigned long flags; |
| 919 | u16 devid; |
| 920 | int ret; |
| 921 | |
| 922 | if (!amd_iommu_v2_supported()) |
| 923 | return -ENODEV; |
| 924 | |
| 925 | devid = device_id(pdev); |
| 926 | |
| 927 | spin_lock_irqsave(&state_lock, flags); |
| 928 | |
| 929 | ret = -EINVAL; |
Joerg Roedel | b87d2d7 | 2014-05-20 23:18:22 +0200 | [diff] [blame] | 930 | dev_state = __get_device_state(devid); |
Joerg Roedel | bc21662 | 2011-12-07 12:24:42 +0100 | [diff] [blame] | 931 | if (dev_state == NULL) |
| 932 | goto out_unlock; |
| 933 | |
| 934 | dev_state->inv_ctx_cb = cb; |
| 935 | |
| 936 | ret = 0; |
| 937 | |
| 938 | out_unlock: |
| 939 | spin_unlock_irqrestore(&state_lock, flags); |
| 940 | |
| 941 | return ret; |
| 942 | } |
| 943 | EXPORT_SYMBOL(amd_iommu_set_invalidate_ctx_cb); |
| 944 | |
Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 945 | static int __init amd_iommu_v2_init(void) |
| 946 | { |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 947 | int ret; |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 948 | |
Joerg Roedel | 63ce3ae | 2015-02-04 16:12:55 +0100 | [diff] [blame] | 949 | pr_info("AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>\n"); |
Joerg Roedel | 474d567d | 2012-03-15 12:46:40 +0100 | [diff] [blame] | 950 | |
| 951 | if (!amd_iommu_v2_supported()) { |
Masanari Iida | 07db040 | 2012-07-22 02:21:32 +0900 | [diff] [blame] | 952 | pr_info("AMD IOMMUv2 functionality not available on this system\n"); |
Joerg Roedel | 474d567d | 2012-03-15 12:46:40 +0100 | [diff] [blame] | 953 | /* |
| 954 | * Load anyway to provide the symbols to other modules |
| 955 | * which may use AMD IOMMUv2 optionally. |
| 956 | */ |
| 957 | return 0; |
| 958 | } |
Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 959 | |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 960 | spin_lock_init(&state_lock); |
| 961 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 962 | ret = -ENOMEM; |
| 963 | iommu_wq = create_workqueue("amd_iommu_v2"); |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 964 | if (iommu_wq == NULL) |
Joerg Roedel | 741669c | 2014-05-20 23:18:23 +0200 | [diff] [blame] | 965 | goto out; |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 966 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 967 | amd_iommu_register_ppr_notifier(&ppr_nb); |
| 968 | |
Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 969 | return 0; |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 970 | |
Joerg Roedel | 741669c | 2014-05-20 23:18:23 +0200 | [diff] [blame] | 971 | out: |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 972 | return ret; |
Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 973 | } |
| 974 | |
| 975 | static void __exit amd_iommu_v2_exit(void) |
| 976 | { |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 977 | struct device_state *dev_state; |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 978 | int i; |
| 979 | |
Joerg Roedel | 474d567d | 2012-03-15 12:46:40 +0100 | [diff] [blame] | 980 | if (!amd_iommu_v2_supported()) |
| 981 | return; |
| 982 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 983 | amd_iommu_unregister_ppr_notifier(&ppr_nb); |
| 984 | |
| 985 | flush_workqueue(iommu_wq); |
| 986 | |
| 987 | /* |
| 988 | * The loop below might call flush_workqueue(), so call |
| 989 | * destroy_workqueue() after it |
| 990 | */ |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 991 | for (i = 0; i < MAX_DEVICES; ++i) { |
| 992 | dev_state = get_device_state(i); |
| 993 | |
| 994 | if (dev_state == NULL) |
| 995 | continue; |
| 996 | |
| 997 | WARN_ON_ONCE(1); |
| 998 | |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 999 | put_device_state(dev_state); |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 1000 | amd_iommu_free_device(dev_state->pdev); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 1001 | } |
| 1002 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 1003 | destroy_workqueue(iommu_wq); |
Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 1004 | } |
| 1005 | |
| 1006 | module_init(amd_iommu_v2_init); |
| 1007 | module_exit(amd_iommu_v2_exit); |