Thomas Gleixner | 4505153 | 2019-05-29 16:57:47 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (C) 2010-2012 Advanced Micro Devices, Inc. |
Joerg Roedel | 63ce3ae | 2015-02-04 16:12:55 +0100 | [diff] [blame] | 4 | * Author: Joerg Roedel <jroedel@suse.de> |
Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 5 | */ |
| 6 | |
Joerg Roedel | 101fa03 | 2018-11-27 16:22:31 +0100 | [diff] [blame] | 7 | #define pr_fmt(fmt) "AMD-Vi: " fmt |
| 8 | |
Xiyu Yang via iommu | 8bc5482 | 2021-07-19 16:32:58 +0800 | [diff] [blame] | 9 | #include <linux/refcount.h> |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 10 | #include <linux/mmu_notifier.h> |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 11 | #include <linux/amd-iommu.h> |
| 12 | #include <linux/mm_types.h> |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 13 | #include <linux/profile.h> |
Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 14 | #include <linux/module.h> |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 15 | #include <linux/sched.h> |
Ingo Molnar | 6e84f31 | 2017-02-08 18:51:29 +0100 | [diff] [blame] | 16 | #include <linux/sched/mm.h> |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 17 | #include <linux/wait.h> |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 18 | #include <linux/pci.h> |
| 19 | #include <linux/gfp.h> |
Tom Lendacky | e9d1d2b | 2021-09-08 17:58:39 -0500 | [diff] [blame] | 20 | #include <linux/cc_platform.h> |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 21 | |
Joerg Roedel | 786dfe4 | 2020-05-27 13:53:11 +0200 | [diff] [blame] | 22 | #include "amd_iommu.h" |
Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 23 | |
| 24 | MODULE_LICENSE("GPL v2"); |
Joerg Roedel | 63ce3ae | 2015-02-04 16:12:55 +0100 | [diff] [blame] | 25 | MODULE_AUTHOR("Joerg Roedel <jroedel@suse.de>"); |
Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 26 | |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 27 | #define PRI_QUEUE_SIZE 512 |
| 28 | |
| 29 | struct pri_queue { |
| 30 | atomic_t inflight; |
| 31 | bool finish; |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 32 | int status; |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 33 | }; |
| 34 | |
| 35 | struct pasid_state { |
| 36 | struct list_head list; /* For global state-list */ |
Xiyu Yang via iommu | 8bc5482 | 2021-07-19 16:32:58 +0800 | [diff] [blame] | 37 | refcount_t count; /* Reference count */ |
Joerg Roedel | d73a6d7 | 2014-06-20 16:14:22 +0200 | [diff] [blame] | 38 | unsigned mmu_notifier_count; /* Counting nested mmu_notifier |
Joerg Roedel | e79df31 | 2014-05-20 23:18:26 +0200 | [diff] [blame] | 39 | calls */ |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 40 | struct mm_struct *mm; /* mm_struct for the faults */ |
Joerg Roedel | ff6d0cc | 2014-07-08 12:49:50 +0200 | [diff] [blame] | 41 | struct mmu_notifier mn; /* mmu_notifier handle */ |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 42 | struct pri_queue pri[PRI_QUEUE_SIZE]; /* PRI tag states */ |
| 43 | struct device_state *device_state; /* Link to our device_state */ |
Fenghua Yu | c7b6bac | 2020-09-15 09:30:05 -0700 | [diff] [blame] | 44 | u32 pasid; /* PASID index */ |
Joerg Roedel | d9e1611 | 2014-07-09 15:43:11 +0200 | [diff] [blame] | 45 | bool invalid; /* Used during setup and |
| 46 | teardown of the pasid */ |
Joerg Roedel | d73a6d7 | 2014-06-20 16:14:22 +0200 | [diff] [blame] | 47 | spinlock_t lock; /* Protect pri_queues and |
| 48 | mmu_notifer_count */ |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 49 | wait_queue_head_t wq; /* To wait for count == 0 */ |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 50 | }; |
| 51 | |
| 52 | struct device_state { |
Joerg Roedel | 741669c | 2014-05-20 23:18:23 +0200 | [diff] [blame] | 53 | struct list_head list; |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 54 | u32 sbdf; |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 55 | atomic_t count; |
| 56 | struct pci_dev *pdev; |
| 57 | struct pasid_state **states; |
| 58 | struct iommu_domain *domain; |
| 59 | int pasid_levels; |
| 60 | int max_pasids; |
Joerg Roedel | 175d614 | 2011-11-28 14:36:36 +0100 | [diff] [blame] | 61 | amd_iommu_invalid_ppr_cb inv_ppr_cb; |
Joerg Roedel | bc21662 | 2011-12-07 12:24:42 +0100 | [diff] [blame] | 62 | amd_iommu_invalidate_ctx inv_ctx_cb; |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 63 | spinlock_t lock; |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 64 | wait_queue_head_t wq; |
| 65 | }; |
| 66 | |
| 67 | struct fault { |
| 68 | struct work_struct work; |
| 69 | struct device_state *dev_state; |
| 70 | struct pasid_state *state; |
| 71 | struct mm_struct *mm; |
| 72 | u64 address; |
Fenghua Yu | c7b6bac | 2020-09-15 09:30:05 -0700 | [diff] [blame] | 73 | u32 pasid; |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 74 | u16 tag; |
| 75 | u16 finish; |
| 76 | u16 flags; |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 77 | }; |
| 78 | |
Joerg Roedel | 741669c | 2014-05-20 23:18:23 +0200 | [diff] [blame] | 79 | static LIST_HEAD(state_list); |
Zheng Yongjun | 106650f | 2020-12-28 21:51:12 +0800 | [diff] [blame] | 80 | static DEFINE_SPINLOCK(state_lock); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 81 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 82 | static struct workqueue_struct *iommu_wq; |
| 83 | |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 84 | static void free_pasid_states(struct device_state *dev_state); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 85 | |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 86 | static struct device_state *__get_device_state(u32 sbdf) |
Joerg Roedel | b87d2d7 | 2014-05-20 23:18:22 +0200 | [diff] [blame] | 87 | { |
Joerg Roedel | 741669c | 2014-05-20 23:18:23 +0200 | [diff] [blame] | 88 | struct device_state *dev_state; |
| 89 | |
| 90 | list_for_each_entry(dev_state, &state_list, list) { |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 91 | if (dev_state->sbdf == sbdf) |
Joerg Roedel | 741669c | 2014-05-20 23:18:23 +0200 | [diff] [blame] | 92 | return dev_state; |
| 93 | } |
| 94 | |
| 95 | return NULL; |
Joerg Roedel | b87d2d7 | 2014-05-20 23:18:22 +0200 | [diff] [blame] | 96 | } |
| 97 | |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 98 | static struct device_state *get_device_state(u32 sbdf) |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 99 | { |
| 100 | struct device_state *dev_state; |
| 101 | unsigned long flags; |
| 102 | |
| 103 | spin_lock_irqsave(&state_lock, flags); |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 104 | dev_state = __get_device_state(sbdf); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 105 | if (dev_state != NULL) |
| 106 | atomic_inc(&dev_state->count); |
| 107 | spin_unlock_irqrestore(&state_lock, flags); |
| 108 | |
| 109 | return dev_state; |
| 110 | } |
| 111 | |
| 112 | static void free_device_state(struct device_state *dev_state) |
| 113 | { |
Joerg Roedel | 55c99a4 | 2015-07-28 16:58:47 +0200 | [diff] [blame] | 114 | struct iommu_group *group; |
| 115 | |
Suravee Suthikulpanit | 9f968fc | 2022-03-01 14:26:26 +0530 | [diff] [blame] | 116 | /* Get rid of any remaining pasid states */ |
| 117 | free_pasid_states(dev_state); |
| 118 | |
| 119 | /* |
| 120 | * Wait until the last reference is dropped before freeing |
| 121 | * the device state. |
| 122 | */ |
| 123 | wait_event(dev_state->wq, !atomic_read(&dev_state->count)); |
| 124 | |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 125 | /* |
| 126 | * First detach device from domain - No more PRI requests will arrive |
| 127 | * from that device after it is unbound from the IOMMUv2 domain. |
| 128 | */ |
Joerg Roedel | 55c99a4 | 2015-07-28 16:58:47 +0200 | [diff] [blame] | 129 | group = iommu_group_get(&dev_state->pdev->dev); |
| 130 | if (WARN_ON(!group)) |
| 131 | return; |
| 132 | |
| 133 | iommu_detach_group(dev_state->domain, group); |
| 134 | |
| 135 | iommu_group_put(group); |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 136 | |
| 137 | /* Everything is down now, free the IOMMUv2 domain */ |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 138 | iommu_domain_free(dev_state->domain); |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 139 | |
| 140 | /* Finally get rid of the device-state */ |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 141 | kfree(dev_state); |
| 142 | } |
| 143 | |
| 144 | static void put_device_state(struct device_state *dev_state) |
| 145 | { |
| 146 | if (atomic_dec_and_test(&dev_state->count)) |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 147 | wake_up(&dev_state->wq); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 148 | } |
| 149 | |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 150 | /* Must be called under dev_state->lock */ |
| 151 | static struct pasid_state **__get_pasid_state_ptr(struct device_state *dev_state, |
Fenghua Yu | c7b6bac | 2020-09-15 09:30:05 -0700 | [diff] [blame] | 152 | u32 pasid, bool alloc) |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 153 | { |
| 154 | struct pasid_state **root, **ptr; |
| 155 | int level, index; |
| 156 | |
| 157 | level = dev_state->pasid_levels; |
| 158 | root = dev_state->states; |
| 159 | |
| 160 | while (true) { |
| 161 | |
| 162 | index = (pasid >> (9 * level)) & 0x1ff; |
| 163 | ptr = &root[index]; |
| 164 | |
| 165 | if (level == 0) |
| 166 | break; |
| 167 | |
| 168 | if (*ptr == NULL) { |
| 169 | if (!alloc) |
| 170 | return NULL; |
| 171 | |
| 172 | *ptr = (void *)get_zeroed_page(GFP_ATOMIC); |
| 173 | if (*ptr == NULL) |
| 174 | return NULL; |
| 175 | } |
| 176 | |
| 177 | root = (struct pasid_state **)*ptr; |
| 178 | level -= 1; |
| 179 | } |
| 180 | |
| 181 | return ptr; |
| 182 | } |
| 183 | |
| 184 | static int set_pasid_state(struct device_state *dev_state, |
| 185 | struct pasid_state *pasid_state, |
Fenghua Yu | c7b6bac | 2020-09-15 09:30:05 -0700 | [diff] [blame] | 186 | u32 pasid) |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 187 | { |
| 188 | struct pasid_state **ptr; |
| 189 | unsigned long flags; |
| 190 | int ret; |
| 191 | |
| 192 | spin_lock_irqsave(&dev_state->lock, flags); |
| 193 | ptr = __get_pasid_state_ptr(dev_state, pasid, true); |
| 194 | |
| 195 | ret = -ENOMEM; |
| 196 | if (ptr == NULL) |
| 197 | goto out_unlock; |
| 198 | |
| 199 | ret = -ENOMEM; |
| 200 | if (*ptr != NULL) |
| 201 | goto out_unlock; |
| 202 | |
| 203 | *ptr = pasid_state; |
| 204 | |
| 205 | ret = 0; |
| 206 | |
| 207 | out_unlock: |
| 208 | spin_unlock_irqrestore(&dev_state->lock, flags); |
| 209 | |
| 210 | return ret; |
| 211 | } |
| 212 | |
Fenghua Yu | c7b6bac | 2020-09-15 09:30:05 -0700 | [diff] [blame] | 213 | static void clear_pasid_state(struct device_state *dev_state, u32 pasid) |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 214 | { |
| 215 | struct pasid_state **ptr; |
| 216 | unsigned long flags; |
| 217 | |
| 218 | spin_lock_irqsave(&dev_state->lock, flags); |
| 219 | ptr = __get_pasid_state_ptr(dev_state, pasid, true); |
| 220 | |
| 221 | if (ptr == NULL) |
| 222 | goto out_unlock; |
| 223 | |
| 224 | *ptr = NULL; |
| 225 | |
| 226 | out_unlock: |
| 227 | spin_unlock_irqrestore(&dev_state->lock, flags); |
| 228 | } |
| 229 | |
| 230 | static struct pasid_state *get_pasid_state(struct device_state *dev_state, |
Fenghua Yu | c7b6bac | 2020-09-15 09:30:05 -0700 | [diff] [blame] | 231 | u32 pasid) |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 232 | { |
| 233 | struct pasid_state **ptr, *ret = NULL; |
| 234 | unsigned long flags; |
| 235 | |
| 236 | spin_lock_irqsave(&dev_state->lock, flags); |
| 237 | ptr = __get_pasid_state_ptr(dev_state, pasid, false); |
| 238 | |
| 239 | if (ptr == NULL) |
| 240 | goto out_unlock; |
| 241 | |
| 242 | ret = *ptr; |
| 243 | if (ret) |
Xiyu Yang via iommu | 8bc5482 | 2021-07-19 16:32:58 +0800 | [diff] [blame] | 244 | refcount_inc(&ret->count); |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 245 | |
| 246 | out_unlock: |
| 247 | spin_unlock_irqrestore(&dev_state->lock, flags); |
| 248 | |
| 249 | return ret; |
| 250 | } |
| 251 | |
| 252 | static void free_pasid_state(struct pasid_state *pasid_state) |
| 253 | { |
| 254 | kfree(pasid_state); |
| 255 | } |
| 256 | |
| 257 | static void put_pasid_state(struct pasid_state *pasid_state) |
| 258 | { |
Xiyu Yang via iommu | 8bc5482 | 2021-07-19 16:32:58 +0800 | [diff] [blame] | 259 | if (refcount_dec_and_test(&pasid_state->count)) |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 260 | wake_up(&pasid_state->wq); |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 261 | } |
| 262 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 263 | static void put_pasid_state_wait(struct pasid_state *pasid_state) |
| 264 | { |
Xiyu Yang via iommu | 8bc5482 | 2021-07-19 16:32:58 +0800 | [diff] [blame] | 265 | refcount_dec(&pasid_state->count); |
| 266 | wait_event(pasid_state->wq, !refcount_read(&pasid_state->count)); |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 267 | free_pasid_state(pasid_state); |
| 268 | } |
| 269 | |
Joerg Roedel | 61feb43 | 2014-07-08 14:19:35 +0200 | [diff] [blame] | 270 | static void unbind_pasid(struct pasid_state *pasid_state) |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 271 | { |
| 272 | struct iommu_domain *domain; |
| 273 | |
| 274 | domain = pasid_state->device_state->domain; |
| 275 | |
Joerg Roedel | 53d340e | 2014-07-08 15:01:43 +0200 | [diff] [blame] | 276 | /* |
| 277 | * Mark pasid_state as invalid, no more faults will we added to the |
| 278 | * work queue after this is visible everywhere. |
| 279 | */ |
| 280 | pasid_state->invalid = true; |
| 281 | |
| 282 | /* Make sure this is visible */ |
| 283 | smp_wmb(); |
| 284 | |
| 285 | /* After this the device/pasid can't access the mm anymore */ |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 286 | amd_iommu_domain_clear_gcr3(domain, pasid_state->pasid); |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 287 | |
| 288 | /* Make sure no more pending faults are in the queue */ |
| 289 | flush_workqueue(iommu_wq); |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 290 | } |
| 291 | |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 292 | static void free_pasid_states_level1(struct pasid_state **tbl) |
| 293 | { |
| 294 | int i; |
| 295 | |
| 296 | for (i = 0; i < 512; ++i) { |
| 297 | if (tbl[i] == NULL) |
| 298 | continue; |
| 299 | |
| 300 | free_page((unsigned long)tbl[i]); |
| 301 | } |
| 302 | } |
| 303 | |
| 304 | static void free_pasid_states_level2(struct pasid_state **tbl) |
| 305 | { |
| 306 | struct pasid_state **ptr; |
| 307 | int i; |
| 308 | |
| 309 | for (i = 0; i < 512; ++i) { |
| 310 | if (tbl[i] == NULL) |
| 311 | continue; |
| 312 | |
| 313 | ptr = (struct pasid_state **)tbl[i]; |
| 314 | free_pasid_states_level1(ptr); |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | static void free_pasid_states(struct device_state *dev_state) |
| 319 | { |
| 320 | struct pasid_state *pasid_state; |
| 321 | int i; |
| 322 | |
| 323 | for (i = 0; i < dev_state->max_pasids; ++i) { |
| 324 | pasid_state = get_pasid_state(dev_state, i); |
| 325 | if (pasid_state == NULL) |
| 326 | continue; |
| 327 | |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 328 | put_pasid_state(pasid_state); |
Joerg Roedel | a40d4c6 | 2014-05-20 23:18:24 +0200 | [diff] [blame] | 329 | |
| 330 | /* |
| 331 | * This will call the mn_release function and |
| 332 | * unbind the PASID |
| 333 | */ |
| 334 | mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm); |
Joerg Roedel | c5db16a | 2014-07-08 14:15:45 +0200 | [diff] [blame] | 335 | |
| 336 | put_pasid_state_wait(pasid_state); /* Reference taken in |
Joerg Roedel | daff2f9 | 2014-07-30 16:04:40 +0200 | [diff] [blame] | 337 | amd_iommu_bind_pasid */ |
Joerg Roedel | 75058a3 | 2014-07-30 16:04:39 +0200 | [diff] [blame] | 338 | |
| 339 | /* Drop reference taken in amd_iommu_bind_pasid */ |
| 340 | put_device_state(dev_state); |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 341 | } |
| 342 | |
| 343 | if (dev_state->pasid_levels == 2) |
| 344 | free_pasid_states_level2(dev_state->states); |
| 345 | else if (dev_state->pasid_levels == 1) |
| 346 | free_pasid_states_level1(dev_state->states); |
Joerg Roedel | 23d3a98 | 2015-08-13 11:15:13 +0200 | [diff] [blame] | 347 | else |
| 348 | BUG_ON(dev_state->pasid_levels != 0); |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 349 | |
| 350 | free_page((unsigned long)dev_state->states); |
| 351 | } |
| 352 | |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 353 | static struct pasid_state *mn_to_state(struct mmu_notifier *mn) |
| 354 | { |
| 355 | return container_of(mn, struct pasid_state, mn); |
| 356 | } |
| 357 | |
Joerg Roedel | e7cc3dd | 2014-11-13 13:46:09 +1100 | [diff] [blame] | 358 | static void mn_invalidate_range(struct mmu_notifier *mn, |
| 359 | struct mm_struct *mm, |
| 360 | unsigned long start, unsigned long end) |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 361 | { |
| 362 | struct pasid_state *pasid_state; |
| 363 | struct device_state *dev_state; |
| 364 | |
| 365 | pasid_state = mn_to_state(mn); |
| 366 | dev_state = pasid_state->device_state; |
| 367 | |
Joerg Roedel | e7cc3dd | 2014-11-13 13:46:09 +1100 | [diff] [blame] | 368 | if ((start ^ (end - 1)) < PAGE_SIZE) |
| 369 | amd_iommu_flush_page(dev_state->domain, pasid_state->pasid, |
| 370 | start); |
| 371 | else |
| 372 | amd_iommu_flush_tlb(dev_state->domain, pasid_state->pasid); |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 373 | } |
| 374 | |
Joerg Roedel | a40d4c6 | 2014-05-20 23:18:24 +0200 | [diff] [blame] | 375 | static void mn_release(struct mmu_notifier *mn, struct mm_struct *mm) |
| 376 | { |
| 377 | struct pasid_state *pasid_state; |
| 378 | struct device_state *dev_state; |
Joerg Roedel | d9e1611 | 2014-07-09 15:43:11 +0200 | [diff] [blame] | 379 | bool run_inv_ctx_cb; |
Joerg Roedel | a40d4c6 | 2014-05-20 23:18:24 +0200 | [diff] [blame] | 380 | |
| 381 | might_sleep(); |
| 382 | |
Joerg Roedel | d9e1611 | 2014-07-09 15:43:11 +0200 | [diff] [blame] | 383 | pasid_state = mn_to_state(mn); |
| 384 | dev_state = pasid_state->device_state; |
| 385 | run_inv_ctx_cb = !pasid_state->invalid; |
Joerg Roedel | a40d4c6 | 2014-05-20 23:18:24 +0200 | [diff] [blame] | 386 | |
Dan Carpenter | 940f700d | 2015-02-20 13:52:01 +0300 | [diff] [blame] | 387 | if (run_inv_ctx_cb && dev_state->inv_ctx_cb) |
Joerg Roedel | a40d4c6 | 2014-05-20 23:18:24 +0200 | [diff] [blame] | 388 | dev_state->inv_ctx_cb(dev_state->pdev, pasid_state->pasid); |
| 389 | |
Joerg Roedel | 61feb43 | 2014-07-08 14:19:35 +0200 | [diff] [blame] | 390 | unbind_pasid(pasid_state); |
Joerg Roedel | a40d4c6 | 2014-05-20 23:18:24 +0200 | [diff] [blame] | 391 | } |
| 392 | |
Julia Lawall | 759ce23 | 2015-11-29 23:02:50 +0100 | [diff] [blame] | 393 | static const struct mmu_notifier_ops iommu_mn = { |
Joerg Roedel | a40d4c6 | 2014-05-20 23:18:24 +0200 | [diff] [blame] | 394 | .release = mn_release, |
Joerg Roedel | e7cc3dd | 2014-11-13 13:46:09 +1100 | [diff] [blame] | 395 | .invalidate_range = mn_invalidate_range, |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 396 | }; |
| 397 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 398 | static void set_pri_tag_status(struct pasid_state *pasid_state, |
| 399 | u16 tag, int status) |
| 400 | { |
| 401 | unsigned long flags; |
| 402 | |
| 403 | spin_lock_irqsave(&pasid_state->lock, flags); |
| 404 | pasid_state->pri[tag].status = status; |
| 405 | spin_unlock_irqrestore(&pasid_state->lock, flags); |
| 406 | } |
| 407 | |
| 408 | static void finish_pri_tag(struct device_state *dev_state, |
| 409 | struct pasid_state *pasid_state, |
| 410 | u16 tag) |
| 411 | { |
| 412 | unsigned long flags; |
| 413 | |
| 414 | spin_lock_irqsave(&pasid_state->lock, flags); |
| 415 | if (atomic_dec_and_test(&pasid_state->pri[tag].inflight) && |
| 416 | pasid_state->pri[tag].finish) { |
| 417 | amd_iommu_complete_ppr(dev_state->pdev, pasid_state->pasid, |
| 418 | pasid_state->pri[tag].status, tag); |
| 419 | pasid_state->pri[tag].finish = false; |
| 420 | pasid_state->pri[tag].status = PPR_SUCCESS; |
| 421 | } |
| 422 | spin_unlock_irqrestore(&pasid_state->lock, flags); |
| 423 | } |
| 424 | |
Jesse Barnes | 9dc00f4 | 2014-12-12 16:55:30 -0800 | [diff] [blame] | 425 | static void handle_fault_error(struct fault *fault) |
| 426 | { |
| 427 | int status; |
| 428 | |
| 429 | if (!fault->dev_state->inv_ppr_cb) { |
| 430 | set_pri_tag_status(fault->state, fault->tag, PPR_INVALID); |
| 431 | return; |
| 432 | } |
| 433 | |
| 434 | status = fault->dev_state->inv_ppr_cb(fault->dev_state->pdev, |
| 435 | fault->pasid, |
| 436 | fault->address, |
| 437 | fault->flags); |
| 438 | switch (status) { |
| 439 | case AMD_IOMMU_INV_PRI_RSP_SUCCESS: |
| 440 | set_pri_tag_status(fault->state, fault->tag, PPR_SUCCESS); |
| 441 | break; |
| 442 | case AMD_IOMMU_INV_PRI_RSP_INVALID: |
| 443 | set_pri_tag_status(fault->state, fault->tag, PPR_INVALID); |
| 444 | break; |
| 445 | case AMD_IOMMU_INV_PRI_RSP_FAIL: |
| 446 | set_pri_tag_status(fault->state, fault->tag, PPR_FAILURE); |
| 447 | break; |
| 448 | default: |
| 449 | BUG(); |
| 450 | } |
| 451 | } |
| 452 | |
Joerg Roedel | 7b5cc1a | 2015-11-17 16:11:36 +0100 | [diff] [blame] | 453 | static bool access_error(struct vm_area_struct *vma, struct fault *fault) |
| 454 | { |
| 455 | unsigned long requested = 0; |
| 456 | |
| 457 | if (fault->flags & PPR_FAULT_EXEC) |
| 458 | requested |= VM_EXEC; |
| 459 | |
| 460 | if (fault->flags & PPR_FAULT_READ) |
| 461 | requested |= VM_READ; |
| 462 | |
| 463 | if (fault->flags & PPR_FAULT_WRITE) |
| 464 | requested |= VM_WRITE; |
| 465 | |
| 466 | return (requested & ~vma->vm_flags) != 0; |
| 467 | } |
| 468 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 469 | static void do_fault(struct work_struct *work) |
| 470 | { |
| 471 | struct fault *fault = container_of(work, struct fault, work); |
Jesse Barnes | 9dc00f4 | 2014-12-12 16:55:30 -0800 | [diff] [blame] | 472 | struct vm_area_struct *vma; |
Souptick Joarder | 50a7ca3 | 2018-08-17 15:44:47 -0700 | [diff] [blame] | 473 | vm_fault_t ret = VM_FAULT_ERROR; |
Joerg Roedel | 43c0ea2 | 2015-11-17 16:11:37 +0100 | [diff] [blame] | 474 | unsigned int flags = 0; |
| 475 | struct mm_struct *mm; |
Jesse Barnes | 9dc00f4 | 2014-12-12 16:55:30 -0800 | [diff] [blame] | 476 | u64 address; |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 477 | |
Jesse Barnes | 9dc00f4 | 2014-12-12 16:55:30 -0800 | [diff] [blame] | 478 | mm = fault->state->mm; |
| 479 | address = fault->address; |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 480 | |
Joerg Roedel | 43c0ea2 | 2015-11-17 16:11:37 +0100 | [diff] [blame] | 481 | if (fault->flags & PPR_FAULT_USER) |
| 482 | flags |= FAULT_FLAG_USER; |
| 483 | if (fault->flags & PPR_FAULT_WRITE) |
| 484 | flags |= FAULT_FLAG_WRITE; |
Dave Hansen | 1b2ee12 | 2016-02-12 13:02:21 -0800 | [diff] [blame] | 485 | flags |= FAULT_FLAG_REMOTE; |
Joerg Roedel | 43c0ea2 | 2015-11-17 16:11:37 +0100 | [diff] [blame] | 486 | |
Michel Lespinasse | d8ed45c | 2020-06-08 21:33:25 -0700 | [diff] [blame] | 487 | mmap_read_lock(mm); |
Jesse Barnes | 9dc00f4 | 2014-12-12 16:55:30 -0800 | [diff] [blame] | 488 | vma = find_extend_vma(mm, address); |
Joerg Roedel | 492e745 | 2015-11-17 16:11:38 +0100 | [diff] [blame] | 489 | if (!vma || address < vma->vm_start) |
Jesse Barnes | 9dc00f4 | 2014-12-12 16:55:30 -0800 | [diff] [blame] | 490 | /* failed to get a vma in the right range */ |
Jesse Barnes | 9dc00f4 | 2014-12-12 16:55:30 -0800 | [diff] [blame] | 491 | goto out; |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 492 | |
Joerg Roedel | 7b5cc1a | 2015-11-17 16:11:36 +0100 | [diff] [blame] | 493 | /* Check if we have the right permissions on the vma */ |
Joerg Roedel | 492e745 | 2015-11-17 16:11:38 +0100 | [diff] [blame] | 494 | if (access_error(vma, fault)) |
Jay Cornwall | d14f6fc | 2015-09-16 14:10:03 -0500 | [diff] [blame] | 495 | goto out; |
Jay Cornwall | d14f6fc | 2015-09-16 14:10:03 -0500 | [diff] [blame] | 496 | |
Peter Xu | bce617e | 2020-08-11 18:37:44 -0700 | [diff] [blame] | 497 | ret = handle_mm_fault(vma, address, flags, NULL); |
Jesse Barnes | 9dc00f4 | 2014-12-12 16:55:30 -0800 | [diff] [blame] | 498 | out: |
Michel Lespinasse | d8ed45c | 2020-06-08 21:33:25 -0700 | [diff] [blame] | 499 | mmap_read_unlock(mm); |
Joerg Roedel | 492e745 | 2015-11-17 16:11:38 +0100 | [diff] [blame] | 500 | |
| 501 | if (ret & VM_FAULT_ERROR) |
| 502 | /* failed to service fault */ |
| 503 | handle_fault_error(fault); |
| 504 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 505 | finish_pri_tag(fault->dev_state, fault->state, fault->tag); |
| 506 | |
| 507 | put_pasid_state(fault->state); |
| 508 | |
| 509 | kfree(fault); |
| 510 | } |
| 511 | |
| 512 | static int ppr_notifier(struct notifier_block *nb, unsigned long e, void *data) |
| 513 | { |
| 514 | struct amd_iommu_fault *iommu_fault; |
| 515 | struct pasid_state *pasid_state; |
| 516 | struct device_state *dev_state; |
Joerg Roedel | fb1b6955 | 2020-05-27 13:53:05 +0200 | [diff] [blame] | 517 | struct pci_dev *pdev = NULL; |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 518 | unsigned long flags; |
| 519 | struct fault *fault; |
| 520 | bool finish; |
Vasant Hegde | 214a05c | 2022-07-06 17:08:25 +0530 | [diff] [blame] | 521 | u16 tag, devid, seg_id; |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 522 | int ret; |
| 523 | |
| 524 | iommu_fault = data; |
| 525 | tag = iommu_fault->tag & 0x1ff; |
| 526 | finish = (iommu_fault->tag >> 9) & 1; |
| 527 | |
Vasant Hegde | 214a05c | 2022-07-06 17:08:25 +0530 | [diff] [blame] | 528 | seg_id = PCI_SBDF_TO_SEGID(iommu_fault->sbdf); |
| 529 | devid = PCI_SBDF_TO_DEVID(iommu_fault->sbdf); |
| 530 | pdev = pci_get_domain_bus_and_slot(seg_id, PCI_BUS_NUM(devid), |
Sinan Kaya | d5bf0f4 | 2017-12-19 00:37:47 -0500 | [diff] [blame] | 531 | devid & 0xff); |
Baoquan He | daae2d2 | 2017-08-09 16:33:43 +0800 | [diff] [blame] | 532 | if (!pdev) |
| 533 | return -ENODEV; |
Joerg Roedel | fb1b6955 | 2020-05-27 13:53:05 +0200 | [diff] [blame] | 534 | |
| 535 | ret = NOTIFY_DONE; |
Baoquan He | daae2d2 | 2017-08-09 16:33:43 +0800 | [diff] [blame] | 536 | |
| 537 | /* In kdump kernel pci dev is not initialized yet -> send INVALID */ |
Lu Baolu | 41bb23e | 2022-02-16 10:52:48 +0800 | [diff] [blame] | 538 | if (amd_iommu_is_attach_deferred(&pdev->dev)) { |
Baoquan He | daae2d2 | 2017-08-09 16:33:43 +0800 | [diff] [blame] | 539 | amd_iommu_complete_ppr(pdev, iommu_fault->pasid, |
| 540 | PPR_INVALID, tag); |
| 541 | goto out; |
| 542 | } |
| 543 | |
Vasant Hegde | 214a05c | 2022-07-06 17:08:25 +0530 | [diff] [blame] | 544 | dev_state = get_device_state(iommu_fault->sbdf); |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 545 | if (dev_state == NULL) |
| 546 | goto out; |
| 547 | |
| 548 | pasid_state = get_pasid_state(dev_state, iommu_fault->pasid); |
Joerg Roedel | 53d340e | 2014-07-08 15:01:43 +0200 | [diff] [blame] | 549 | if (pasid_state == NULL || pasid_state->invalid) { |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 550 | /* We know the device but not the PASID -> send INVALID */ |
| 551 | amd_iommu_complete_ppr(dev_state->pdev, iommu_fault->pasid, |
| 552 | PPR_INVALID, tag); |
| 553 | goto out_drop_state; |
| 554 | } |
| 555 | |
| 556 | spin_lock_irqsave(&pasid_state->lock, flags); |
| 557 | atomic_inc(&pasid_state->pri[tag].inflight); |
| 558 | if (finish) |
| 559 | pasid_state->pri[tag].finish = true; |
| 560 | spin_unlock_irqrestore(&pasid_state->lock, flags); |
| 561 | |
| 562 | fault = kzalloc(sizeof(*fault), GFP_ATOMIC); |
| 563 | if (fault == NULL) { |
| 564 | /* We are OOM - send success and let the device re-fault */ |
| 565 | finish_pri_tag(dev_state, pasid_state, tag); |
| 566 | goto out_drop_state; |
| 567 | } |
| 568 | |
| 569 | fault->dev_state = dev_state; |
| 570 | fault->address = iommu_fault->address; |
| 571 | fault->state = pasid_state; |
| 572 | fault->tag = tag; |
| 573 | fault->finish = finish; |
Alexey Skidanov | b00675b | 2014-07-08 17:30:16 +0300 | [diff] [blame] | 574 | fault->pasid = iommu_fault->pasid; |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 575 | fault->flags = iommu_fault->flags; |
| 576 | INIT_WORK(&fault->work, do_fault); |
| 577 | |
| 578 | queue_work(iommu_wq, &fault->work); |
| 579 | |
| 580 | ret = NOTIFY_OK; |
| 581 | |
| 582 | out_drop_state: |
Joerg Roedel | dc88db7 | 2014-07-08 14:55:10 +0200 | [diff] [blame] | 583 | |
| 584 | if (ret != NOTIFY_OK && pasid_state) |
| 585 | put_pasid_state(pasid_state); |
| 586 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 587 | put_device_state(dev_state); |
| 588 | |
| 589 | out: |
Yang Yingliang | 6cf0981 | 2022-11-18 17:36:04 +0800 | [diff] [blame] | 590 | pci_dev_put(pdev); |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 591 | return ret; |
| 592 | } |
| 593 | |
| 594 | static struct notifier_block ppr_nb = { |
| 595 | .notifier_call = ppr_notifier, |
| 596 | }; |
| 597 | |
Fenghua Yu | c7b6bac | 2020-09-15 09:30:05 -0700 | [diff] [blame] | 598 | int amd_iommu_bind_pasid(struct pci_dev *pdev, u32 pasid, |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 599 | struct task_struct *task) |
| 600 | { |
| 601 | struct pasid_state *pasid_state; |
| 602 | struct device_state *dev_state; |
Joerg Roedel | f0aac63 | 2014-07-08 15:15:07 +0200 | [diff] [blame] | 603 | struct mm_struct *mm; |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 604 | u32 sbdf; |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 605 | int ret; |
| 606 | |
| 607 | might_sleep(); |
| 608 | |
| 609 | if (!amd_iommu_v2_supported()) |
| 610 | return -ENODEV; |
| 611 | |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 612 | sbdf = get_pci_sbdf_id(pdev); |
| 613 | dev_state = get_device_state(sbdf); |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 614 | |
| 615 | if (dev_state == NULL) |
| 616 | return -EINVAL; |
| 617 | |
| 618 | ret = -EINVAL; |
Fenghua Yu | c7b6bac | 2020-09-15 09:30:05 -0700 | [diff] [blame] | 619 | if (pasid >= dev_state->max_pasids) |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 620 | goto out; |
| 621 | |
| 622 | ret = -ENOMEM; |
| 623 | pasid_state = kzalloc(sizeof(*pasid_state), GFP_KERNEL); |
| 624 | if (pasid_state == NULL) |
| 625 | goto out; |
| 626 | |
Joerg Roedel | f0aac63 | 2014-07-08 15:15:07 +0200 | [diff] [blame] | 627 | |
Xiyu Yang via iommu | 8bc5482 | 2021-07-19 16:32:58 +0800 | [diff] [blame] | 628 | refcount_set(&pasid_state->count, 1); |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 629 | init_waitqueue_head(&pasid_state->wq); |
Joerg Roedel | 2c13d47 | 2012-07-19 10:56:10 +0200 | [diff] [blame] | 630 | spin_lock_init(&pasid_state->lock); |
| 631 | |
Joerg Roedel | f0aac63 | 2014-07-08 15:15:07 +0200 | [diff] [blame] | 632 | mm = get_task_mm(task); |
Joerg Roedel | f0aac63 | 2014-07-08 15:15:07 +0200 | [diff] [blame] | 633 | pasid_state->mm = mm; |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 634 | pasid_state->device_state = dev_state; |
| 635 | pasid_state->pasid = pasid; |
Joerg Roedel | d9e1611 | 2014-07-09 15:43:11 +0200 | [diff] [blame] | 636 | pasid_state->invalid = true; /* Mark as valid only if we are |
| 637 | done with setting up the pasid */ |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 638 | pasid_state->mn.ops = &iommu_mn; |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 639 | |
| 640 | if (pasid_state->mm == NULL) |
| 641 | goto out_free; |
| 642 | |
Denis Arefev | b09b567 | 2022-11-18 13:42:52 +0300 | [diff] [blame] | 643 | ret = mmu_notifier_register(&pasid_state->mn, mm); |
| 644 | if (ret) |
| 645 | goto out_free; |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 646 | |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 647 | ret = set_pasid_state(dev_state, pasid_state, pasid); |
| 648 | if (ret) |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 649 | goto out_unregister; |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 650 | |
| 651 | ret = amd_iommu_domain_set_gcr3(dev_state->domain, pasid, |
| 652 | __pa(pasid_state->mm->pgd)); |
| 653 | if (ret) |
| 654 | goto out_clear_state; |
| 655 | |
Joerg Roedel | d9e1611 | 2014-07-09 15:43:11 +0200 | [diff] [blame] | 656 | /* Now we are ready to handle faults */ |
| 657 | pasid_state->invalid = false; |
| 658 | |
Joerg Roedel | f0aac63 | 2014-07-08 15:15:07 +0200 | [diff] [blame] | 659 | /* |
| 660 | * Drop the reference to the mm_struct here. We rely on the |
| 661 | * mmu_notifier release call-back to inform us when the mm |
| 662 | * is going away. |
| 663 | */ |
| 664 | mmput(mm); |
| 665 | |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 666 | return 0; |
| 667 | |
| 668 | out_clear_state: |
| 669 | clear_pasid_state(dev_state, pasid); |
| 670 | |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 671 | out_unregister: |
Joerg Roedel | f0aac63 | 2014-07-08 15:15:07 +0200 | [diff] [blame] | 672 | mmu_notifier_unregister(&pasid_state->mn, mm); |
Pan Bian | 73dbd4a | 2017-04-23 18:23:21 +0800 | [diff] [blame] | 673 | mmput(mm); |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 674 | |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 675 | out_free: |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 676 | free_pasid_state(pasid_state); |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 677 | |
| 678 | out: |
| 679 | put_device_state(dev_state); |
| 680 | |
| 681 | return ret; |
| 682 | } |
| 683 | EXPORT_SYMBOL(amd_iommu_bind_pasid); |
| 684 | |
Fenghua Yu | c7b6bac | 2020-09-15 09:30:05 -0700 | [diff] [blame] | 685 | void amd_iommu_unbind_pasid(struct pci_dev *pdev, u32 pasid) |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 686 | { |
Joerg Roedel | a40d4c6 | 2014-05-20 23:18:24 +0200 | [diff] [blame] | 687 | struct pasid_state *pasid_state; |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 688 | struct device_state *dev_state; |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 689 | u32 sbdf; |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 690 | |
| 691 | might_sleep(); |
| 692 | |
| 693 | if (!amd_iommu_v2_supported()) |
| 694 | return; |
| 695 | |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 696 | sbdf = get_pci_sbdf_id(pdev); |
| 697 | dev_state = get_device_state(sbdf); |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 698 | if (dev_state == NULL) |
| 699 | return; |
| 700 | |
Fenghua Yu | c7b6bac | 2020-09-15 09:30:05 -0700 | [diff] [blame] | 701 | if (pasid >= dev_state->max_pasids) |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 702 | goto out; |
| 703 | |
Joerg Roedel | a40d4c6 | 2014-05-20 23:18:24 +0200 | [diff] [blame] | 704 | pasid_state = get_pasid_state(dev_state, pasid); |
| 705 | if (pasid_state == NULL) |
| 706 | goto out; |
| 707 | /* |
| 708 | * Drop reference taken here. We are safe because we still hold |
| 709 | * the reference taken in the amd_iommu_bind_pasid function. |
| 710 | */ |
| 711 | put_pasid_state(pasid_state); |
| 712 | |
Joerg Roedel | 53d340e | 2014-07-08 15:01:43 +0200 | [diff] [blame] | 713 | /* Clear the pasid state so that the pasid can be re-used */ |
| 714 | clear_pasid_state(dev_state, pasid_state->pasid); |
| 715 | |
Joerg Roedel | f0aac63 | 2014-07-08 15:15:07 +0200 | [diff] [blame] | 716 | /* |
Joerg Roedel | fcaa960 | 2014-07-30 16:04:37 +0200 | [diff] [blame] | 717 | * Call mmu_notifier_unregister to drop our reference |
| 718 | * to pasid_state->mm |
Joerg Roedel | f0aac63 | 2014-07-08 15:15:07 +0200 | [diff] [blame] | 719 | */ |
Joerg Roedel | fcaa960 | 2014-07-30 16:04:37 +0200 | [diff] [blame] | 720 | mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm); |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 721 | |
Joerg Roedel | c5db16a | 2014-07-08 14:15:45 +0200 | [diff] [blame] | 722 | put_pasid_state_wait(pasid_state); /* Reference taken in |
Joerg Roedel | daff2f9 | 2014-07-30 16:04:40 +0200 | [diff] [blame] | 723 | amd_iommu_bind_pasid */ |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 724 | out: |
Joerg Roedel | 75058a3 | 2014-07-30 16:04:39 +0200 | [diff] [blame] | 725 | /* Drop reference taken in this function */ |
| 726 | put_device_state(dev_state); |
| 727 | |
| 728 | /* Drop reference taken in amd_iommu_bind_pasid */ |
Joerg Roedel | 2d5503b | 2011-11-24 10:41:57 +0100 | [diff] [blame] | 729 | put_device_state(dev_state); |
| 730 | } |
| 731 | EXPORT_SYMBOL(amd_iommu_unbind_pasid); |
| 732 | |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 733 | int amd_iommu_init_device(struct pci_dev *pdev, int pasids) |
| 734 | { |
| 735 | struct device_state *dev_state; |
Joerg Roedel | 55c99a4 | 2015-07-28 16:58:47 +0200 | [diff] [blame] | 736 | struct iommu_group *group; |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 737 | unsigned long flags; |
| 738 | int ret, tmp; |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 739 | u32 sbdf; |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 740 | |
| 741 | might_sleep(); |
| 742 | |
Joerg Roedel | 2822e58 | 2020-08-24 12:54:15 +0200 | [diff] [blame] | 743 | /* |
| 744 | * When memory encryption is active the device is likely not in a |
| 745 | * direct-mapped domain. Forbid using IOMMUv2 functionality for now. |
| 746 | */ |
Tom Lendacky | e9d1d2b | 2021-09-08 17:58:39 -0500 | [diff] [blame] | 747 | if (cc_platform_has(CC_ATTR_MEM_ENCRYPT)) |
Joerg Roedel | 2822e58 | 2020-08-24 12:54:15 +0200 | [diff] [blame] | 748 | return -ENODEV; |
| 749 | |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 750 | if (!amd_iommu_v2_supported()) |
| 751 | return -ENODEV; |
| 752 | |
| 753 | if (pasids <= 0 || pasids > (PASID_MASK + 1)) |
| 754 | return -EINVAL; |
| 755 | |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 756 | sbdf = get_pci_sbdf_id(pdev); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 757 | |
| 758 | dev_state = kzalloc(sizeof(*dev_state), GFP_KERNEL); |
| 759 | if (dev_state == NULL) |
| 760 | return -ENOMEM; |
| 761 | |
| 762 | spin_lock_init(&dev_state->lock); |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 763 | init_waitqueue_head(&dev_state->wq); |
Joerg Roedel | 741669c | 2014-05-20 23:18:23 +0200 | [diff] [blame] | 764 | dev_state->pdev = pdev; |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 765 | dev_state->sbdf = sbdf; |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 766 | |
| 767 | tmp = pasids; |
| 768 | for (dev_state->pasid_levels = 0; (tmp - 1) & ~0x1ff; tmp >>= 9) |
| 769 | dev_state->pasid_levels += 1; |
| 770 | |
| 771 | atomic_set(&dev_state->count, 1); |
| 772 | dev_state->max_pasids = pasids; |
| 773 | |
| 774 | ret = -ENOMEM; |
| 775 | dev_state->states = (void *)get_zeroed_page(GFP_KERNEL); |
| 776 | if (dev_state->states == NULL) |
| 777 | goto out_free_dev_state; |
| 778 | |
| 779 | dev_state->domain = iommu_domain_alloc(&pci_bus_type); |
| 780 | if (dev_state->domain == NULL) |
| 781 | goto out_free_states; |
| 782 | |
Jason Gunthorpe | 2380f1e | 2022-09-09 16:46:31 -0300 | [diff] [blame] | 783 | /* See iommu_is_default_domain() */ |
| 784 | dev_state->domain->type = IOMMU_DOMAIN_IDENTITY; |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 785 | amd_iommu_domain_direct_map(dev_state->domain); |
| 786 | |
| 787 | ret = amd_iommu_domain_enable_v2(dev_state->domain, pasids); |
| 788 | if (ret) |
| 789 | goto out_free_domain; |
| 790 | |
Joerg Roedel | 55c99a4 | 2015-07-28 16:58:47 +0200 | [diff] [blame] | 791 | group = iommu_group_get(&pdev->dev); |
Dan Carpenter | 24c790f | 2016-11-24 14:05:44 +0300 | [diff] [blame] | 792 | if (!group) { |
| 793 | ret = -EINVAL; |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 794 | goto out_free_domain; |
Dan Carpenter | 24c790f | 2016-11-24 14:05:44 +0300 | [diff] [blame] | 795 | } |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 796 | |
Joerg Roedel | 55c99a4 | 2015-07-28 16:58:47 +0200 | [diff] [blame] | 797 | ret = iommu_attach_group(dev_state->domain, group); |
| 798 | if (ret != 0) |
| 799 | goto out_drop_group; |
| 800 | |
| 801 | iommu_group_put(group); |
| 802 | |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 803 | spin_lock_irqsave(&state_lock, flags); |
| 804 | |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 805 | if (__get_device_state(sbdf) != NULL) { |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 806 | spin_unlock_irqrestore(&state_lock, flags); |
| 807 | ret = -EBUSY; |
| 808 | goto out_free_domain; |
| 809 | } |
| 810 | |
Joerg Roedel | 741669c | 2014-05-20 23:18:23 +0200 | [diff] [blame] | 811 | list_add_tail(&dev_state->list, &state_list); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 812 | |
| 813 | spin_unlock_irqrestore(&state_lock, flags); |
| 814 | |
| 815 | return 0; |
| 816 | |
Joerg Roedel | 55c99a4 | 2015-07-28 16:58:47 +0200 | [diff] [blame] | 817 | out_drop_group: |
| 818 | iommu_group_put(group); |
| 819 | |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 820 | out_free_domain: |
| 821 | iommu_domain_free(dev_state->domain); |
| 822 | |
| 823 | out_free_states: |
| 824 | free_page((unsigned long)dev_state->states); |
| 825 | |
| 826 | out_free_dev_state: |
| 827 | kfree(dev_state); |
| 828 | |
| 829 | return ret; |
| 830 | } |
| 831 | EXPORT_SYMBOL(amd_iommu_init_device); |
| 832 | |
| 833 | void amd_iommu_free_device(struct pci_dev *pdev) |
| 834 | { |
| 835 | struct device_state *dev_state; |
| 836 | unsigned long flags; |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 837 | u32 sbdf; |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 838 | |
| 839 | if (!amd_iommu_v2_supported()) |
| 840 | return; |
| 841 | |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 842 | sbdf = get_pci_sbdf_id(pdev); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 843 | |
| 844 | spin_lock_irqsave(&state_lock, flags); |
| 845 | |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 846 | dev_state = __get_device_state(sbdf); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 847 | if (dev_state == NULL) { |
| 848 | spin_unlock_irqrestore(&state_lock, flags); |
| 849 | return; |
| 850 | } |
| 851 | |
Joerg Roedel | 741669c | 2014-05-20 23:18:23 +0200 | [diff] [blame] | 852 | list_del(&dev_state->list); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 853 | |
| 854 | spin_unlock_irqrestore(&state_lock, flags); |
| 855 | |
Peter Zijlstra | 91f65fa | 2015-02-03 13:25:51 +0100 | [diff] [blame] | 856 | put_device_state(dev_state); |
Peter Zijlstra | 91f65fa | 2015-02-03 13:25:51 +0100 | [diff] [blame] | 857 | free_device_state(dev_state); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 858 | } |
| 859 | EXPORT_SYMBOL(amd_iommu_free_device); |
| 860 | |
Joerg Roedel | 175d614 | 2011-11-28 14:36:36 +0100 | [diff] [blame] | 861 | int amd_iommu_set_invalid_ppr_cb(struct pci_dev *pdev, |
| 862 | amd_iommu_invalid_ppr_cb cb) |
| 863 | { |
| 864 | struct device_state *dev_state; |
| 865 | unsigned long flags; |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 866 | u32 sbdf; |
Joerg Roedel | 175d614 | 2011-11-28 14:36:36 +0100 | [diff] [blame] | 867 | int ret; |
| 868 | |
| 869 | if (!amd_iommu_v2_supported()) |
| 870 | return -ENODEV; |
| 871 | |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 872 | sbdf = get_pci_sbdf_id(pdev); |
Joerg Roedel | 175d614 | 2011-11-28 14:36:36 +0100 | [diff] [blame] | 873 | |
| 874 | spin_lock_irqsave(&state_lock, flags); |
| 875 | |
| 876 | ret = -EINVAL; |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 877 | dev_state = __get_device_state(sbdf); |
Joerg Roedel | 175d614 | 2011-11-28 14:36:36 +0100 | [diff] [blame] | 878 | if (dev_state == NULL) |
| 879 | goto out_unlock; |
| 880 | |
| 881 | dev_state->inv_ppr_cb = cb; |
| 882 | |
| 883 | ret = 0; |
| 884 | |
| 885 | out_unlock: |
| 886 | spin_unlock_irqrestore(&state_lock, flags); |
| 887 | |
| 888 | return ret; |
| 889 | } |
| 890 | EXPORT_SYMBOL(amd_iommu_set_invalid_ppr_cb); |
| 891 | |
Joerg Roedel | bc21662 | 2011-12-07 12:24:42 +0100 | [diff] [blame] | 892 | int amd_iommu_set_invalidate_ctx_cb(struct pci_dev *pdev, |
| 893 | amd_iommu_invalidate_ctx cb) |
| 894 | { |
| 895 | struct device_state *dev_state; |
| 896 | unsigned long flags; |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 897 | u32 sbdf; |
Joerg Roedel | bc21662 | 2011-12-07 12:24:42 +0100 | [diff] [blame] | 898 | int ret; |
| 899 | |
| 900 | if (!amd_iommu_v2_supported()) |
| 901 | return -ENODEV; |
| 902 | |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 903 | sbdf = get_pci_sbdf_id(pdev); |
Joerg Roedel | bc21662 | 2011-12-07 12:24:42 +0100 | [diff] [blame] | 904 | |
| 905 | spin_lock_irqsave(&state_lock, flags); |
| 906 | |
| 907 | ret = -EINVAL; |
Vasant Hegde | 196dff7 | 2022-07-06 17:08:24 +0530 | [diff] [blame] | 908 | dev_state = __get_device_state(sbdf); |
Joerg Roedel | bc21662 | 2011-12-07 12:24:42 +0100 | [diff] [blame] | 909 | if (dev_state == NULL) |
| 910 | goto out_unlock; |
| 911 | |
| 912 | dev_state->inv_ctx_cb = cb; |
| 913 | |
| 914 | ret = 0; |
| 915 | |
| 916 | out_unlock: |
| 917 | spin_unlock_irqrestore(&state_lock, flags); |
| 918 | |
| 919 | return ret; |
| 920 | } |
| 921 | EXPORT_SYMBOL(amd_iommu_set_invalidate_ctx_cb); |
| 922 | |
Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 923 | static int __init amd_iommu_v2_init(void) |
| 924 | { |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 925 | int ret; |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 926 | |
Joerg Roedel | 474d567d | 2012-03-15 12:46:40 +0100 | [diff] [blame] | 927 | if (!amd_iommu_v2_supported()) { |
Joerg Roedel | 717e88a | 2021-11-23 11:55:07 +0100 | [diff] [blame] | 928 | pr_info("AMD IOMMUv2 functionality not available on this system - This is not a bug.\n"); |
Joerg Roedel | 474d567d | 2012-03-15 12:46:40 +0100 | [diff] [blame] | 929 | /* |
| 930 | * Load anyway to provide the symbols to other modules |
| 931 | * which may use AMD IOMMUv2 optionally. |
| 932 | */ |
| 933 | return 0; |
| 934 | } |
Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 935 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 936 | ret = -ENOMEM; |
Bhaktipriya Shridhar | cf7513e | 2016-06-18 13:58:30 +0530 | [diff] [blame] | 937 | iommu_wq = alloc_workqueue("amd_iommu_v2", WQ_MEM_RECLAIM, 0); |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 938 | if (iommu_wq == NULL) |
Joerg Roedel | 741669c | 2014-05-20 23:18:23 +0200 | [diff] [blame] | 939 | goto out; |
Joerg Roedel | 8736b2c | 2011-11-24 16:21:52 +0100 | [diff] [blame] | 940 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 941 | amd_iommu_register_ppr_notifier(&ppr_nb); |
| 942 | |
Joerg Roedel | 717e88a | 2021-11-23 11:55:07 +0100 | [diff] [blame] | 943 | pr_info("AMD IOMMUv2 loaded and initialized\n"); |
| 944 | |
Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 945 | return 0; |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 946 | |
Joerg Roedel | 741669c | 2014-05-20 23:18:23 +0200 | [diff] [blame] | 947 | out: |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 948 | return ret; |
Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 949 | } |
| 950 | |
| 951 | static void __exit amd_iommu_v2_exit(void) |
| 952 | { |
Suravee Suthikulpanit | 9f968fc | 2022-03-01 14:26:26 +0530 | [diff] [blame] | 953 | struct device_state *dev_state, *next; |
| 954 | unsigned long flags; |
Suravee Suthikulpanit | 5edde87 | 2022-03-13 21:43:21 -0500 | [diff] [blame] | 955 | LIST_HEAD(freelist); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 956 | |
Joerg Roedel | 474d567d | 2012-03-15 12:46:40 +0100 | [diff] [blame] | 957 | if (!amd_iommu_v2_supported()) |
| 958 | return; |
| 959 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 960 | amd_iommu_unregister_ppr_notifier(&ppr_nb); |
| 961 | |
| 962 | flush_workqueue(iommu_wq); |
| 963 | |
| 964 | /* |
| 965 | * The loop below might call flush_workqueue(), so call |
| 966 | * destroy_workqueue() after it |
| 967 | */ |
Suravee Suthikulpanit | 9f968fc | 2022-03-01 14:26:26 +0530 | [diff] [blame] | 968 | spin_lock_irqsave(&state_lock, flags); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 969 | |
Suravee Suthikulpanit | 9f968fc | 2022-03-01 14:26:26 +0530 | [diff] [blame] | 970 | list_for_each_entry_safe(dev_state, next, &state_list, list) { |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 971 | WARN_ON_ONCE(1); |
| 972 | |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 973 | put_device_state(dev_state); |
Suravee Suthikulpanit | 9f968fc | 2022-03-01 14:26:26 +0530 | [diff] [blame] | 974 | list_del(&dev_state->list); |
Suravee Suthikulpanit | 5edde87 | 2022-03-13 21:43:21 -0500 | [diff] [blame] | 975 | list_add_tail(&dev_state->list, &freelist); |
Joerg Roedel | ed96f22 | 2011-11-23 17:30:39 +0100 | [diff] [blame] | 976 | } |
| 977 | |
Suravee Suthikulpanit | 9f968fc | 2022-03-01 14:26:26 +0530 | [diff] [blame] | 978 | spin_unlock_irqrestore(&state_lock, flags); |
| 979 | |
Suravee Suthikulpanit | 5edde87 | 2022-03-13 21:43:21 -0500 | [diff] [blame] | 980 | /* |
| 981 | * Since free_device_state waits on the count to be zero, |
| 982 | * we need to free dev_state outside the spinlock. |
| 983 | */ |
| 984 | list_for_each_entry_safe(dev_state, next, &freelist, list) { |
| 985 | list_del(&dev_state->list); |
| 986 | free_device_state(dev_state); |
| 987 | } |
| 988 | |
Joerg Roedel | 028eeac | 2011-11-24 12:48:13 +0100 | [diff] [blame] | 989 | destroy_workqueue(iommu_wq); |
Joerg Roedel | e3c495c | 2011-11-09 12:31:15 +0100 | [diff] [blame] | 990 | } |
| 991 | |
| 992 | module_init(amd_iommu_v2_init); |
| 993 | module_exit(amd_iommu_v2_exit); |