Commit | Line | Data |
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10e5247f KA |
1 | /* |
2 | * Copyright (c) 2006, Intel Corporation. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
98bcef56 | 17 | * Copyright (C) 2006-2008 Intel Corporation |
18 | * Author: Ashok Raj <ashok.raj@intel.com> | |
19 | * Author: Shaohua Li <shaohua.li@intel.com> | |
20 | * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> | |
10e5247f | 21 | * |
e61d98d8 | 22 | * This file implements early detection/parsing of Remapping Devices |
10e5247f KA |
23 | * reported to OS through BIOS via DMA remapping reporting (DMAR) ACPI |
24 | * tables. | |
e61d98d8 SS |
25 | * |
26 | * These routines are used by both DMA-remapping and Interrupt-remapping | |
10e5247f KA |
27 | */ |
28 | ||
9f10e5bf | 29 | #define pr_fmt(fmt) "DMAR: " fmt |
e9071b0b | 30 | |
10e5247f KA |
31 | #include <linux/pci.h> |
32 | #include <linux/dmar.h> | |
38717946 KA |
33 | #include <linux/iova.h> |
34 | #include <linux/intel-iommu.h> | |
fe962e90 | 35 | #include <linux/timer.h> |
0ac2491f SS |
36 | #include <linux/irq.h> |
37 | #include <linux/interrupt.h> | |
69575d38 | 38 | #include <linux/tboot.h> |
eb27cae8 | 39 | #include <linux/dmi.h> |
5a0e3ad6 | 40 | #include <linux/slab.h> |
a5459cfe | 41 | #include <linux/iommu.h> |
8a8f422d | 42 | #include <asm/irq_remapping.h> |
4db77ff3 | 43 | #include <asm/iommu_table.h> |
10e5247f | 44 | |
078e1ee2 JR |
45 | #include "irq_remapping.h" |
46 | ||
c2a0b538 JL |
47 | typedef int (*dmar_res_handler_t)(struct acpi_dmar_header *, void *); |
48 | struct dmar_res_callback { | |
49 | dmar_res_handler_t cb[ACPI_DMAR_TYPE_RESERVED]; | |
50 | void *arg[ACPI_DMAR_TYPE_RESERVED]; | |
51 | bool ignore_unhandled; | |
52 | bool print_entry; | |
53 | }; | |
54 | ||
3a5670e8 JL |
55 | /* |
56 | * Assumptions: | |
57 | * 1) The hotplug framework guarentees that DMAR unit will be hot-added | |
58 | * before IO devices managed by that unit. | |
59 | * 2) The hotplug framework guarantees that DMAR unit will be hot-removed | |
60 | * after IO devices managed by that unit. | |
61 | * 3) Hotplug events are rare. | |
62 | * | |
63 | * Locking rules for DMA and interrupt remapping related global data structures: | |
64 | * 1) Use dmar_global_lock in process context | |
65 | * 2) Use RCU in interrupt context | |
10e5247f | 66 | */ |
3a5670e8 | 67 | DECLARE_RWSEM(dmar_global_lock); |
10e5247f | 68 | LIST_HEAD(dmar_drhd_units); |
10e5247f | 69 | |
41750d31 | 70 | struct acpi_table_header * __initdata dmar_tbl; |
8e1568f3 | 71 | static acpi_size dmar_tbl_size; |
2e455289 | 72 | static int dmar_dev_scope_status = 1; |
78d8e704 | 73 | static unsigned long dmar_seq_ids[BITS_TO_LONGS(DMAR_UNITS_SUPPORTED)]; |
10e5247f | 74 | |
694835dc | 75 | static int alloc_iommu(struct dmar_drhd_unit *drhd); |
a868e6b7 | 76 | static void free_iommu(struct intel_iommu *iommu); |
694835dc | 77 | |
6b197249 | 78 | static void dmar_register_drhd_unit(struct dmar_drhd_unit *drhd) |
10e5247f KA |
79 | { |
80 | /* | |
81 | * add INCLUDE_ALL at the tail, so scan the list will find it at | |
82 | * the very end. | |
83 | */ | |
84 | if (drhd->include_all) | |
0e242612 | 85 | list_add_tail_rcu(&drhd->list, &dmar_drhd_units); |
10e5247f | 86 | else |
0e242612 | 87 | list_add_rcu(&drhd->list, &dmar_drhd_units); |
10e5247f KA |
88 | } |
89 | ||
bb3a6b78 | 90 | void *dmar_alloc_dev_scope(void *start, void *end, int *cnt) |
10e5247f KA |
91 | { |
92 | struct acpi_dmar_device_scope *scope; | |
10e5247f KA |
93 | |
94 | *cnt = 0; | |
95 | while (start < end) { | |
96 | scope = start; | |
83118b0d | 97 | if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_NAMESPACE || |
07cb52ff | 98 | scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT || |
10e5247f KA |
99 | scope->entry_type == ACPI_DMAR_SCOPE_TYPE_BRIDGE) |
100 | (*cnt)++; | |
ae3e7f3a LC |
101 | else if (scope->entry_type != ACPI_DMAR_SCOPE_TYPE_IOAPIC && |
102 | scope->entry_type != ACPI_DMAR_SCOPE_TYPE_HPET) { | |
e9071b0b | 103 | pr_warn("Unsupported device scope\n"); |
5715f0f9 | 104 | } |
10e5247f KA |
105 | start += scope->length; |
106 | } | |
107 | if (*cnt == 0) | |
bb3a6b78 JL |
108 | return NULL; |
109 | ||
832bd858 | 110 | return kcalloc(*cnt, sizeof(struct dmar_dev_scope), GFP_KERNEL); |
bb3a6b78 JL |
111 | } |
112 | ||
832bd858 | 113 | void dmar_free_dev_scope(struct dmar_dev_scope **devices, int *cnt) |
ada4d4b2 | 114 | { |
b683b230 | 115 | int i; |
832bd858 | 116 | struct device *tmp_dev; |
b683b230 | 117 | |
ada4d4b2 | 118 | if (*devices && *cnt) { |
b683b230 | 119 | for_each_active_dev_scope(*devices, *cnt, i, tmp_dev) |
832bd858 | 120 | put_device(tmp_dev); |
ada4d4b2 | 121 | kfree(*devices); |
ada4d4b2 | 122 | } |
0e242612 JL |
123 | |
124 | *devices = NULL; | |
125 | *cnt = 0; | |
ada4d4b2 JL |
126 | } |
127 | ||
59ce0515 JL |
128 | /* Optimize out kzalloc()/kfree() for normal cases */ |
129 | static char dmar_pci_notify_info_buf[64]; | |
130 | ||
131 | static struct dmar_pci_notify_info * | |
132 | dmar_alloc_pci_notify_info(struct pci_dev *dev, unsigned long event) | |
133 | { | |
134 | int level = 0; | |
135 | size_t size; | |
136 | struct pci_dev *tmp; | |
137 | struct dmar_pci_notify_info *info; | |
138 | ||
139 | BUG_ON(dev->is_virtfn); | |
140 | ||
141 | /* Only generate path[] for device addition event */ | |
142 | if (event == BUS_NOTIFY_ADD_DEVICE) | |
143 | for (tmp = dev; tmp; tmp = tmp->bus->self) | |
144 | level++; | |
145 | ||
146 | size = sizeof(*info) + level * sizeof(struct acpi_dmar_pci_path); | |
147 | if (size <= sizeof(dmar_pci_notify_info_buf)) { | |
148 | info = (struct dmar_pci_notify_info *)dmar_pci_notify_info_buf; | |
149 | } else { | |
150 | info = kzalloc(size, GFP_KERNEL); | |
151 | if (!info) { | |
152 | pr_warn("Out of memory when allocating notify_info " | |
153 | "for %s.\n", pci_name(dev)); | |
2e455289 JL |
154 | if (dmar_dev_scope_status == 0) |
155 | dmar_dev_scope_status = -ENOMEM; | |
59ce0515 JL |
156 | return NULL; |
157 | } | |
158 | } | |
159 | ||
160 | info->event = event; | |
161 | info->dev = dev; | |
162 | info->seg = pci_domain_nr(dev->bus); | |
163 | info->level = level; | |
164 | if (event == BUS_NOTIFY_ADD_DEVICE) { | |
5ae0566a JL |
165 | for (tmp = dev; tmp; tmp = tmp->bus->self) { |
166 | level--; | |
57384592 | 167 | info->path[level].bus = tmp->bus->number; |
59ce0515 JL |
168 | info->path[level].device = PCI_SLOT(tmp->devfn); |
169 | info->path[level].function = PCI_FUNC(tmp->devfn); | |
170 | if (pci_is_root_bus(tmp->bus)) | |
171 | info->bus = tmp->bus->number; | |
172 | } | |
173 | } | |
174 | ||
175 | return info; | |
176 | } | |
177 | ||
178 | static inline void dmar_free_pci_notify_info(struct dmar_pci_notify_info *info) | |
179 | { | |
180 | if ((void *)info != dmar_pci_notify_info_buf) | |
181 | kfree(info); | |
182 | } | |
183 | ||
184 | static bool dmar_match_pci_path(struct dmar_pci_notify_info *info, int bus, | |
185 | struct acpi_dmar_pci_path *path, int count) | |
186 | { | |
187 | int i; | |
188 | ||
189 | if (info->bus != bus) | |
80f7b3d1 | 190 | goto fallback; |
59ce0515 | 191 | if (info->level != count) |
80f7b3d1 | 192 | goto fallback; |
59ce0515 JL |
193 | |
194 | for (i = 0; i < count; i++) { | |
195 | if (path[i].device != info->path[i].device || | |
196 | path[i].function != info->path[i].function) | |
80f7b3d1 | 197 | goto fallback; |
59ce0515 JL |
198 | } |
199 | ||
200 | return true; | |
80f7b3d1 JR |
201 | |
202 | fallback: | |
203 | ||
204 | if (count != 1) | |
205 | return false; | |
206 | ||
207 | i = info->level - 1; | |
208 | if (bus == info->path[i].bus && | |
209 | path[0].device == info->path[i].device && | |
210 | path[0].function == info->path[i].function) { | |
211 | pr_info(FW_BUG "RMRR entry for device %02x:%02x.%x is broken - applying workaround\n", | |
212 | bus, path[0].device, path[0].function); | |
213 | return true; | |
214 | } | |
215 | ||
216 | return false; | |
59ce0515 JL |
217 | } |
218 | ||
219 | /* Return: > 0 if match found, 0 if no match found, < 0 if error happens */ | |
220 | int dmar_insert_dev_scope(struct dmar_pci_notify_info *info, | |
221 | void *start, void*end, u16 segment, | |
832bd858 DW |
222 | struct dmar_dev_scope *devices, |
223 | int devices_cnt) | |
59ce0515 JL |
224 | { |
225 | int i, level; | |
832bd858 | 226 | struct device *tmp, *dev = &info->dev->dev; |
59ce0515 JL |
227 | struct acpi_dmar_device_scope *scope; |
228 | struct acpi_dmar_pci_path *path; | |
229 | ||
230 | if (segment != info->seg) | |
231 | return 0; | |
232 | ||
233 | for (; start < end; start += scope->length) { | |
234 | scope = start; | |
235 | if (scope->entry_type != ACPI_DMAR_SCOPE_TYPE_ENDPOINT && | |
236 | scope->entry_type != ACPI_DMAR_SCOPE_TYPE_BRIDGE) | |
237 | continue; | |
238 | ||
239 | path = (struct acpi_dmar_pci_path *)(scope + 1); | |
240 | level = (scope->length - sizeof(*scope)) / sizeof(*path); | |
241 | if (!dmar_match_pci_path(info, scope->bus, path, level)) | |
242 | continue; | |
243 | ||
244 | if ((scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT) ^ | |
832bd858 | 245 | (info->dev->hdr_type == PCI_HEADER_TYPE_NORMAL)) { |
59ce0515 | 246 | pr_warn("Device scope type does not match for %s\n", |
832bd858 | 247 | pci_name(info->dev)); |
59ce0515 JL |
248 | return -EINVAL; |
249 | } | |
250 | ||
251 | for_each_dev_scope(devices, devices_cnt, i, tmp) | |
252 | if (tmp == NULL) { | |
832bd858 DW |
253 | devices[i].bus = info->dev->bus->number; |
254 | devices[i].devfn = info->dev->devfn; | |
255 | rcu_assign_pointer(devices[i].dev, | |
256 | get_device(dev)); | |
59ce0515 JL |
257 | return 1; |
258 | } | |
259 | BUG_ON(i >= devices_cnt); | |
260 | } | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
265 | int dmar_remove_dev_scope(struct dmar_pci_notify_info *info, u16 segment, | |
832bd858 | 266 | struct dmar_dev_scope *devices, int count) |
59ce0515 JL |
267 | { |
268 | int index; | |
832bd858 | 269 | struct device *tmp; |
59ce0515 JL |
270 | |
271 | if (info->seg != segment) | |
272 | return 0; | |
273 | ||
274 | for_each_active_dev_scope(devices, count, index, tmp) | |
832bd858 | 275 | if (tmp == &info->dev->dev) { |
eecbad7d | 276 | RCU_INIT_POINTER(devices[index].dev, NULL); |
59ce0515 | 277 | synchronize_rcu(); |
832bd858 | 278 | put_device(tmp); |
59ce0515 JL |
279 | return 1; |
280 | } | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
285 | static int dmar_pci_bus_add_dev(struct dmar_pci_notify_info *info) | |
286 | { | |
287 | int ret = 0; | |
288 | struct dmar_drhd_unit *dmaru; | |
289 | struct acpi_dmar_hardware_unit *drhd; | |
290 | ||
291 | for_each_drhd_unit(dmaru) { | |
292 | if (dmaru->include_all) | |
293 | continue; | |
294 | ||
295 | drhd = container_of(dmaru->hdr, | |
296 | struct acpi_dmar_hardware_unit, header); | |
297 | ret = dmar_insert_dev_scope(info, (void *)(drhd + 1), | |
298 | ((void *)drhd) + drhd->header.length, | |
299 | dmaru->segment, | |
300 | dmaru->devices, dmaru->devices_cnt); | |
301 | if (ret != 0) | |
302 | break; | |
303 | } | |
304 | if (ret >= 0) | |
305 | ret = dmar_iommu_notify_scope_dev(info); | |
2e455289 JL |
306 | if (ret < 0 && dmar_dev_scope_status == 0) |
307 | dmar_dev_scope_status = ret; | |
59ce0515 JL |
308 | |
309 | return ret; | |
310 | } | |
311 | ||
312 | static void dmar_pci_bus_del_dev(struct dmar_pci_notify_info *info) | |
313 | { | |
314 | struct dmar_drhd_unit *dmaru; | |
315 | ||
316 | for_each_drhd_unit(dmaru) | |
317 | if (dmar_remove_dev_scope(info, dmaru->segment, | |
318 | dmaru->devices, dmaru->devices_cnt)) | |
319 | break; | |
320 | dmar_iommu_notify_scope_dev(info); | |
321 | } | |
322 | ||
323 | static int dmar_pci_bus_notifier(struct notifier_block *nb, | |
324 | unsigned long action, void *data) | |
325 | { | |
326 | struct pci_dev *pdev = to_pci_dev(data); | |
327 | struct dmar_pci_notify_info *info; | |
328 | ||
329 | /* Only care about add/remove events for physical functions */ | |
330 | if (pdev->is_virtfn) | |
331 | return NOTIFY_DONE; | |
e6a8c9b3 JR |
332 | if (action != BUS_NOTIFY_ADD_DEVICE && |
333 | action != BUS_NOTIFY_REMOVED_DEVICE) | |
59ce0515 JL |
334 | return NOTIFY_DONE; |
335 | ||
336 | info = dmar_alloc_pci_notify_info(pdev, action); | |
337 | if (!info) | |
338 | return NOTIFY_DONE; | |
339 | ||
340 | down_write(&dmar_global_lock); | |
341 | if (action == BUS_NOTIFY_ADD_DEVICE) | |
342 | dmar_pci_bus_add_dev(info); | |
e6a8c9b3 | 343 | else if (action == BUS_NOTIFY_REMOVED_DEVICE) |
59ce0515 JL |
344 | dmar_pci_bus_del_dev(info); |
345 | up_write(&dmar_global_lock); | |
346 | ||
347 | dmar_free_pci_notify_info(info); | |
348 | ||
349 | return NOTIFY_OK; | |
350 | } | |
351 | ||
352 | static struct notifier_block dmar_pci_bus_nb = { | |
353 | .notifier_call = dmar_pci_bus_notifier, | |
354 | .priority = INT_MIN, | |
355 | }; | |
356 | ||
6b197249 JL |
357 | static struct dmar_drhd_unit * |
358 | dmar_find_dmaru(struct acpi_dmar_hardware_unit *drhd) | |
359 | { | |
360 | struct dmar_drhd_unit *dmaru; | |
361 | ||
362 | list_for_each_entry_rcu(dmaru, &dmar_drhd_units, list) | |
363 | if (dmaru->segment == drhd->segment && | |
364 | dmaru->reg_base_addr == drhd->address) | |
365 | return dmaru; | |
366 | ||
367 | return NULL; | |
368 | } | |
369 | ||
10e5247f KA |
370 | /** |
371 | * dmar_parse_one_drhd - parses exactly one DMA remapping hardware definition | |
372 | * structure which uniquely represent one DMA remapping hardware unit | |
373 | * present in the platform | |
374 | */ | |
6b197249 | 375 | static int dmar_parse_one_drhd(struct acpi_dmar_header *header, void *arg) |
10e5247f KA |
376 | { |
377 | struct acpi_dmar_hardware_unit *drhd; | |
378 | struct dmar_drhd_unit *dmaru; | |
379 | int ret = 0; | |
10e5247f | 380 | |
e523b38e | 381 | drhd = (struct acpi_dmar_hardware_unit *)header; |
6b197249 JL |
382 | dmaru = dmar_find_dmaru(drhd); |
383 | if (dmaru) | |
384 | goto out; | |
385 | ||
386 | dmaru = kzalloc(sizeof(*dmaru) + header->length, GFP_KERNEL); | |
10e5247f KA |
387 | if (!dmaru) |
388 | return -ENOMEM; | |
389 | ||
6b197249 JL |
390 | /* |
391 | * If header is allocated from slab by ACPI _DSM method, we need to | |
392 | * copy the content because the memory buffer will be freed on return. | |
393 | */ | |
394 | dmaru->hdr = (void *)(dmaru + 1); | |
395 | memcpy(dmaru->hdr, header, header->length); | |
10e5247f | 396 | dmaru->reg_base_addr = drhd->address; |
276dbf99 | 397 | dmaru->segment = drhd->segment; |
10e5247f | 398 | dmaru->include_all = drhd->flags & 0x1; /* BIT0: INCLUDE_ALL */ |
07cb52ff DW |
399 | dmaru->devices = dmar_alloc_dev_scope((void *)(drhd + 1), |
400 | ((void *)drhd) + drhd->header.length, | |
401 | &dmaru->devices_cnt); | |
402 | if (dmaru->devices_cnt && dmaru->devices == NULL) { | |
403 | kfree(dmaru); | |
404 | return -ENOMEM; | |
2e455289 | 405 | } |
10e5247f | 406 | |
1886e8a9 SS |
407 | ret = alloc_iommu(dmaru); |
408 | if (ret) { | |
07cb52ff DW |
409 | dmar_free_dev_scope(&dmaru->devices, |
410 | &dmaru->devices_cnt); | |
1886e8a9 SS |
411 | kfree(dmaru); |
412 | return ret; | |
413 | } | |
414 | dmar_register_drhd_unit(dmaru); | |
c2a0b538 | 415 | |
6b197249 | 416 | out: |
c2a0b538 JL |
417 | if (arg) |
418 | (*(int *)arg)++; | |
419 | ||
1886e8a9 SS |
420 | return 0; |
421 | } | |
422 | ||
a868e6b7 JL |
423 | static void dmar_free_drhd(struct dmar_drhd_unit *dmaru) |
424 | { | |
425 | if (dmaru->devices && dmaru->devices_cnt) | |
426 | dmar_free_dev_scope(&dmaru->devices, &dmaru->devices_cnt); | |
427 | if (dmaru->iommu) | |
428 | free_iommu(dmaru->iommu); | |
429 | kfree(dmaru); | |
430 | } | |
431 | ||
c2a0b538 JL |
432 | static int __init dmar_parse_one_andd(struct acpi_dmar_header *header, |
433 | void *arg) | |
e625b4a9 DW |
434 | { |
435 | struct acpi_dmar_andd *andd = (void *)header; | |
436 | ||
437 | /* Check for NUL termination within the designated length */ | |
83118b0d | 438 | if (strnlen(andd->device_name, header->length - 8) == header->length - 8) { |
e625b4a9 DW |
439 | WARN_TAINT(1, TAINT_FIRMWARE_WORKAROUND, |
440 | "Your BIOS is broken; ANDD object name is not NUL-terminated\n" | |
441 | "BIOS vendor: %s; Ver: %s; Product Version: %s\n", | |
442 | dmi_get_system_info(DMI_BIOS_VENDOR), | |
443 | dmi_get_system_info(DMI_BIOS_VERSION), | |
444 | dmi_get_system_info(DMI_PRODUCT_VERSION)); | |
445 | return -EINVAL; | |
446 | } | |
447 | pr_info("ANDD device: %x name: %s\n", andd->device_number, | |
83118b0d | 448 | andd->device_name); |
e625b4a9 DW |
449 | |
450 | return 0; | |
451 | } | |
452 | ||
aa697079 | 453 | #ifdef CONFIG_ACPI_NUMA |
6b197249 | 454 | static int dmar_parse_one_rhsa(struct acpi_dmar_header *header, void *arg) |
ee34b32d SS |
455 | { |
456 | struct acpi_dmar_rhsa *rhsa; | |
457 | struct dmar_drhd_unit *drhd; | |
458 | ||
459 | rhsa = (struct acpi_dmar_rhsa *)header; | |
aa697079 | 460 | for_each_drhd_unit(drhd) { |
ee34b32d SS |
461 | if (drhd->reg_base_addr == rhsa->base_address) { |
462 | int node = acpi_map_pxm_to_node(rhsa->proximity_domain); | |
463 | ||
464 | if (!node_online(node)) | |
465 | node = -1; | |
466 | drhd->iommu->node = node; | |
aa697079 DW |
467 | return 0; |
468 | } | |
ee34b32d | 469 | } |
fd0c8894 BH |
470 | WARN_TAINT( |
471 | 1, TAINT_FIRMWARE_WORKAROUND, | |
472 | "Your BIOS is broken; RHSA refers to non-existent DMAR unit at %llx\n" | |
473 | "BIOS vendor: %s; Ver: %s; Product Version: %s\n", | |
474 | drhd->reg_base_addr, | |
475 | dmi_get_system_info(DMI_BIOS_VENDOR), | |
476 | dmi_get_system_info(DMI_BIOS_VERSION), | |
477 | dmi_get_system_info(DMI_PRODUCT_VERSION)); | |
ee34b32d | 478 | |
aa697079 | 479 | return 0; |
ee34b32d | 480 | } |
c2a0b538 JL |
481 | #else |
482 | #define dmar_parse_one_rhsa dmar_res_noop | |
aa697079 | 483 | #endif |
ee34b32d | 484 | |
10e5247f KA |
485 | static void __init |
486 | dmar_table_print_dmar_entry(struct acpi_dmar_header *header) | |
487 | { | |
488 | struct acpi_dmar_hardware_unit *drhd; | |
489 | struct acpi_dmar_reserved_memory *rmrr; | |
aa5d2b51 | 490 | struct acpi_dmar_atsr *atsr; |
17b60977 | 491 | struct acpi_dmar_rhsa *rhsa; |
10e5247f KA |
492 | |
493 | switch (header->type) { | |
494 | case ACPI_DMAR_TYPE_HARDWARE_UNIT: | |
aa5d2b51 YZ |
495 | drhd = container_of(header, struct acpi_dmar_hardware_unit, |
496 | header); | |
e9071b0b | 497 | pr_info("DRHD base: %#016Lx flags: %#x\n", |
aa5d2b51 | 498 | (unsigned long long)drhd->address, drhd->flags); |
10e5247f KA |
499 | break; |
500 | case ACPI_DMAR_TYPE_RESERVED_MEMORY: | |
aa5d2b51 YZ |
501 | rmrr = container_of(header, struct acpi_dmar_reserved_memory, |
502 | header); | |
e9071b0b | 503 | pr_info("RMRR base: %#016Lx end: %#016Lx\n", |
5b6985ce FY |
504 | (unsigned long long)rmrr->base_address, |
505 | (unsigned long long)rmrr->end_address); | |
10e5247f | 506 | break; |
83118b0d | 507 | case ACPI_DMAR_TYPE_ROOT_ATS: |
aa5d2b51 | 508 | atsr = container_of(header, struct acpi_dmar_atsr, header); |
e9071b0b | 509 | pr_info("ATSR flags: %#x\n", atsr->flags); |
aa5d2b51 | 510 | break; |
83118b0d | 511 | case ACPI_DMAR_TYPE_HARDWARE_AFFINITY: |
17b60977 | 512 | rhsa = container_of(header, struct acpi_dmar_rhsa, header); |
e9071b0b | 513 | pr_info("RHSA base: %#016Lx proximity domain: %#x\n", |
17b60977 RD |
514 | (unsigned long long)rhsa->base_address, |
515 | rhsa->proximity_domain); | |
516 | break; | |
83118b0d | 517 | case ACPI_DMAR_TYPE_NAMESPACE: |
e625b4a9 DW |
518 | /* We don't print this here because we need to sanity-check |
519 | it first. So print it in dmar_parse_one_andd() instead. */ | |
520 | break; | |
10e5247f KA |
521 | } |
522 | } | |
523 | ||
f6dd5c31 YL |
524 | /** |
525 | * dmar_table_detect - checks to see if the platform supports DMAR devices | |
526 | */ | |
527 | static int __init dmar_table_detect(void) | |
528 | { | |
529 | acpi_status status = AE_OK; | |
530 | ||
531 | /* if we could find DMAR table, then there are DMAR devices */ | |
8e1568f3 YL |
532 | status = acpi_get_table_with_size(ACPI_SIG_DMAR, 0, |
533 | (struct acpi_table_header **)&dmar_tbl, | |
534 | &dmar_tbl_size); | |
f6dd5c31 YL |
535 | |
536 | if (ACPI_SUCCESS(status) && !dmar_tbl) { | |
e9071b0b | 537 | pr_warn("Unable to map DMAR\n"); |
f6dd5c31 YL |
538 | status = AE_NOT_FOUND; |
539 | } | |
540 | ||
541 | return (ACPI_SUCCESS(status) ? 1 : 0); | |
542 | } | |
aaa9d1dd | 543 | |
c2a0b538 JL |
544 | static int dmar_walk_remapping_entries(struct acpi_dmar_header *start, |
545 | size_t len, struct dmar_res_callback *cb) | |
546 | { | |
547 | int ret = 0; | |
548 | struct acpi_dmar_header *iter, *next; | |
549 | struct acpi_dmar_header *end = ((void *)start) + len; | |
550 | ||
551 | for (iter = start; iter < end && ret == 0; iter = next) { | |
552 | next = (void *)iter + iter->length; | |
553 | if (iter->length == 0) { | |
554 | /* Avoid looping forever on bad ACPI tables */ | |
555 | pr_debug(FW_BUG "Invalid 0-length structure\n"); | |
556 | break; | |
557 | } else if (next > end) { | |
558 | /* Avoid passing table end */ | |
9f10e5bf | 559 | pr_warn(FW_BUG "Record passes table end\n"); |
c2a0b538 JL |
560 | ret = -EINVAL; |
561 | break; | |
562 | } | |
563 | ||
564 | if (cb->print_entry) | |
565 | dmar_table_print_dmar_entry(iter); | |
566 | ||
567 | if (iter->type >= ACPI_DMAR_TYPE_RESERVED) { | |
568 | /* continue for forward compatibility */ | |
569 | pr_debug("Unknown DMAR structure type %d\n", | |
570 | iter->type); | |
571 | } else if (cb->cb[iter->type]) { | |
572 | ret = cb->cb[iter->type](iter, cb->arg[iter->type]); | |
573 | } else if (!cb->ignore_unhandled) { | |
574 | pr_warn("No handler for DMAR structure type %d\n", | |
575 | iter->type); | |
576 | ret = -EINVAL; | |
577 | } | |
578 | } | |
579 | ||
580 | return ret; | |
581 | } | |
582 | ||
583 | static inline int dmar_walk_dmar_table(struct acpi_table_dmar *dmar, | |
584 | struct dmar_res_callback *cb) | |
585 | { | |
586 | return dmar_walk_remapping_entries((void *)(dmar + 1), | |
587 | dmar->header.length - sizeof(*dmar), cb); | |
588 | } | |
589 | ||
10e5247f KA |
590 | /** |
591 | * parse_dmar_table - parses the DMA reporting table | |
592 | */ | |
593 | static int __init | |
594 | parse_dmar_table(void) | |
595 | { | |
596 | struct acpi_table_dmar *dmar; | |
10e5247f | 597 | int ret = 0; |
7cef3347 | 598 | int drhd_count = 0; |
c2a0b538 JL |
599 | struct dmar_res_callback cb = { |
600 | .print_entry = true, | |
601 | .ignore_unhandled = true, | |
602 | .arg[ACPI_DMAR_TYPE_HARDWARE_UNIT] = &drhd_count, | |
603 | .cb[ACPI_DMAR_TYPE_HARDWARE_UNIT] = &dmar_parse_one_drhd, | |
604 | .cb[ACPI_DMAR_TYPE_RESERVED_MEMORY] = &dmar_parse_one_rmrr, | |
605 | .cb[ACPI_DMAR_TYPE_ROOT_ATS] = &dmar_parse_one_atsr, | |
606 | .cb[ACPI_DMAR_TYPE_HARDWARE_AFFINITY] = &dmar_parse_one_rhsa, | |
607 | .cb[ACPI_DMAR_TYPE_NAMESPACE] = &dmar_parse_one_andd, | |
608 | }; | |
10e5247f | 609 | |
f6dd5c31 YL |
610 | /* |
611 | * Do it again, earlier dmar_tbl mapping could be mapped with | |
612 | * fixed map. | |
613 | */ | |
614 | dmar_table_detect(); | |
615 | ||
a59b50e9 JC |
616 | /* |
617 | * ACPI tables may not be DMA protected by tboot, so use DMAR copy | |
618 | * SINIT saved in SinitMleData in TXT heap (which is DMA protected) | |
619 | */ | |
620 | dmar_tbl = tboot_get_dmar_table(dmar_tbl); | |
621 | ||
10e5247f KA |
622 | dmar = (struct acpi_table_dmar *)dmar_tbl; |
623 | if (!dmar) | |
624 | return -ENODEV; | |
625 | ||
5b6985ce | 626 | if (dmar->width < PAGE_SHIFT - 1) { |
e9071b0b | 627 | pr_warn("Invalid DMAR haw\n"); |
10e5247f KA |
628 | return -EINVAL; |
629 | } | |
630 | ||
e9071b0b | 631 | pr_info("Host address width %d\n", dmar->width + 1); |
c2a0b538 JL |
632 | ret = dmar_walk_dmar_table(dmar, &cb); |
633 | if (ret == 0 && drhd_count == 0) | |
7cef3347 | 634 | pr_warn(FW_BUG "No DRHD structure found in DMAR table\n"); |
c2a0b538 | 635 | |
10e5247f KA |
636 | return ret; |
637 | } | |
638 | ||
832bd858 DW |
639 | static int dmar_pci_device_match(struct dmar_dev_scope devices[], |
640 | int cnt, struct pci_dev *dev) | |
e61d98d8 SS |
641 | { |
642 | int index; | |
832bd858 | 643 | struct device *tmp; |
e61d98d8 SS |
644 | |
645 | while (dev) { | |
b683b230 | 646 | for_each_active_dev_scope(devices, cnt, index, tmp) |
832bd858 | 647 | if (dev_is_pci(tmp) && dev == to_pci_dev(tmp)) |
e61d98d8 SS |
648 | return 1; |
649 | ||
650 | /* Check our parent */ | |
651 | dev = dev->bus->self; | |
652 | } | |
653 | ||
654 | return 0; | |
655 | } | |
656 | ||
657 | struct dmar_drhd_unit * | |
658 | dmar_find_matched_drhd_unit(struct pci_dev *dev) | |
659 | { | |
0e242612 | 660 | struct dmar_drhd_unit *dmaru; |
2e824f79 YZ |
661 | struct acpi_dmar_hardware_unit *drhd; |
662 | ||
dda56549 Y |
663 | dev = pci_physfn(dev); |
664 | ||
0e242612 | 665 | rcu_read_lock(); |
8b161f0e | 666 | for_each_drhd_unit(dmaru) { |
2e824f79 YZ |
667 | drhd = container_of(dmaru->hdr, |
668 | struct acpi_dmar_hardware_unit, | |
669 | header); | |
670 | ||
671 | if (dmaru->include_all && | |
672 | drhd->segment == pci_domain_nr(dev->bus)) | |
0e242612 | 673 | goto out; |
e61d98d8 | 674 | |
2e824f79 YZ |
675 | if (dmar_pci_device_match(dmaru->devices, |
676 | dmaru->devices_cnt, dev)) | |
0e242612 | 677 | goto out; |
e61d98d8 | 678 | } |
0e242612 JL |
679 | dmaru = NULL; |
680 | out: | |
681 | rcu_read_unlock(); | |
e61d98d8 | 682 | |
0e242612 | 683 | return dmaru; |
e61d98d8 SS |
684 | } |
685 | ||
ed40356b DW |
686 | static void __init dmar_acpi_insert_dev_scope(u8 device_number, |
687 | struct acpi_device *adev) | |
688 | { | |
689 | struct dmar_drhd_unit *dmaru; | |
690 | struct acpi_dmar_hardware_unit *drhd; | |
691 | struct acpi_dmar_device_scope *scope; | |
692 | struct device *tmp; | |
693 | int i; | |
694 | struct acpi_dmar_pci_path *path; | |
695 | ||
696 | for_each_drhd_unit(dmaru) { | |
697 | drhd = container_of(dmaru->hdr, | |
698 | struct acpi_dmar_hardware_unit, | |
699 | header); | |
700 | ||
701 | for (scope = (void *)(drhd + 1); | |
702 | (unsigned long)scope < ((unsigned long)drhd) + drhd->header.length; | |
703 | scope = ((void *)scope) + scope->length) { | |
83118b0d | 704 | if (scope->entry_type != ACPI_DMAR_SCOPE_TYPE_NAMESPACE) |
ed40356b DW |
705 | continue; |
706 | if (scope->enumeration_id != device_number) | |
707 | continue; | |
708 | ||
709 | path = (void *)(scope + 1); | |
710 | pr_info("ACPI device \"%s\" under DMAR at %llx as %02x:%02x.%d\n", | |
711 | dev_name(&adev->dev), dmaru->reg_base_addr, | |
712 | scope->bus, path->device, path->function); | |
713 | for_each_dev_scope(dmaru->devices, dmaru->devices_cnt, i, tmp) | |
714 | if (tmp == NULL) { | |
715 | dmaru->devices[i].bus = scope->bus; | |
716 | dmaru->devices[i].devfn = PCI_DEVFN(path->device, | |
717 | path->function); | |
718 | rcu_assign_pointer(dmaru->devices[i].dev, | |
719 | get_device(&adev->dev)); | |
720 | return; | |
721 | } | |
722 | BUG_ON(i >= dmaru->devices_cnt); | |
723 | } | |
724 | } | |
725 | pr_warn("No IOMMU scope found for ANDD enumeration ID %d (%s)\n", | |
726 | device_number, dev_name(&adev->dev)); | |
727 | } | |
728 | ||
729 | static int __init dmar_acpi_dev_scope_init(void) | |
730 | { | |
11f1a776 JR |
731 | struct acpi_dmar_andd *andd; |
732 | ||
733 | if (dmar_tbl == NULL) | |
734 | return -ENODEV; | |
735 | ||
7713ec06 DW |
736 | for (andd = (void *)dmar_tbl + sizeof(struct acpi_table_dmar); |
737 | ((unsigned long)andd) < ((unsigned long)dmar_tbl) + dmar_tbl->length; | |
738 | andd = ((void *)andd) + andd->header.length) { | |
83118b0d | 739 | if (andd->header.type == ACPI_DMAR_TYPE_NAMESPACE) { |
ed40356b DW |
740 | acpi_handle h; |
741 | struct acpi_device *adev; | |
742 | ||
743 | if (!ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, | |
83118b0d | 744 | andd->device_name, |
ed40356b DW |
745 | &h))) { |
746 | pr_err("Failed to find handle for ACPI object %s\n", | |
83118b0d | 747 | andd->device_name); |
ed40356b DW |
748 | continue; |
749 | } | |
c0df975f | 750 | if (acpi_bus_get_device(h, &adev)) { |
ed40356b | 751 | pr_err("Failed to get device for ACPI object %s\n", |
83118b0d | 752 | andd->device_name); |
ed40356b DW |
753 | continue; |
754 | } | |
755 | dmar_acpi_insert_dev_scope(andd->device_number, adev); | |
756 | } | |
ed40356b DW |
757 | } |
758 | return 0; | |
759 | } | |
760 | ||
1886e8a9 SS |
761 | int __init dmar_dev_scope_init(void) |
762 | { | |
2e455289 JL |
763 | struct pci_dev *dev = NULL; |
764 | struct dmar_pci_notify_info *info; | |
1886e8a9 | 765 | |
2e455289 JL |
766 | if (dmar_dev_scope_status != 1) |
767 | return dmar_dev_scope_status; | |
c2c7286a | 768 | |
2e455289 JL |
769 | if (list_empty(&dmar_drhd_units)) { |
770 | dmar_dev_scope_status = -ENODEV; | |
771 | } else { | |
772 | dmar_dev_scope_status = 0; | |
773 | ||
63b42624 DW |
774 | dmar_acpi_dev_scope_init(); |
775 | ||
2e455289 JL |
776 | for_each_pci_dev(dev) { |
777 | if (dev->is_virtfn) | |
778 | continue; | |
779 | ||
780 | info = dmar_alloc_pci_notify_info(dev, | |
781 | BUS_NOTIFY_ADD_DEVICE); | |
782 | if (!info) { | |
783 | return dmar_dev_scope_status; | |
784 | } else { | |
785 | dmar_pci_bus_add_dev(info); | |
786 | dmar_free_pci_notify_info(info); | |
787 | } | |
788 | } | |
318fe7df | 789 | |
2e455289 | 790 | bus_register_notifier(&pci_bus_type, &dmar_pci_bus_nb); |
1886e8a9 SS |
791 | } |
792 | ||
2e455289 | 793 | return dmar_dev_scope_status; |
1886e8a9 SS |
794 | } |
795 | ||
10e5247f KA |
796 | |
797 | int __init dmar_table_init(void) | |
798 | { | |
1886e8a9 | 799 | static int dmar_table_initialized; |
093f87d2 FY |
800 | int ret; |
801 | ||
cc05301f JL |
802 | if (dmar_table_initialized == 0) { |
803 | ret = parse_dmar_table(); | |
804 | if (ret < 0) { | |
805 | if (ret != -ENODEV) | |
9f10e5bf | 806 | pr_info("Parse DMAR table failure.\n"); |
cc05301f JL |
807 | } else if (list_empty(&dmar_drhd_units)) { |
808 | pr_info("No DMAR devices found\n"); | |
809 | ret = -ENODEV; | |
810 | } | |
093f87d2 | 811 | |
cc05301f JL |
812 | if (ret < 0) |
813 | dmar_table_initialized = ret; | |
814 | else | |
815 | dmar_table_initialized = 1; | |
10e5247f | 816 | } |
093f87d2 | 817 | |
cc05301f | 818 | return dmar_table_initialized < 0 ? dmar_table_initialized : 0; |
10e5247f KA |
819 | } |
820 | ||
3a8663ee BH |
821 | static void warn_invalid_dmar(u64 addr, const char *message) |
822 | { | |
fd0c8894 BH |
823 | WARN_TAINT_ONCE( |
824 | 1, TAINT_FIRMWARE_WORKAROUND, | |
825 | "Your BIOS is broken; DMAR reported at address %llx%s!\n" | |
826 | "BIOS vendor: %s; Ver: %s; Product Version: %s\n", | |
827 | addr, message, | |
828 | dmi_get_system_info(DMI_BIOS_VENDOR), | |
829 | dmi_get_system_info(DMI_BIOS_VERSION), | |
830 | dmi_get_system_info(DMI_PRODUCT_VERSION)); | |
3a8663ee | 831 | } |
6ecbf01c | 832 | |
c2a0b538 JL |
833 | static int __ref |
834 | dmar_validate_one_drhd(struct acpi_dmar_header *entry, void *arg) | |
86cf898e | 835 | { |
86cf898e | 836 | struct acpi_dmar_hardware_unit *drhd; |
c2a0b538 JL |
837 | void __iomem *addr; |
838 | u64 cap, ecap; | |
86cf898e | 839 | |
c2a0b538 JL |
840 | drhd = (void *)entry; |
841 | if (!drhd->address) { | |
842 | warn_invalid_dmar(0, ""); | |
843 | return -EINVAL; | |
844 | } | |
2c992208 | 845 | |
6b197249 JL |
846 | if (arg) |
847 | addr = ioremap(drhd->address, VTD_PAGE_SIZE); | |
848 | else | |
849 | addr = early_ioremap(drhd->address, VTD_PAGE_SIZE); | |
c2a0b538 | 850 | if (!addr) { |
9f10e5bf | 851 | pr_warn("Can't validate DRHD address: %llx\n", drhd->address); |
c2a0b538 JL |
852 | return -EINVAL; |
853 | } | |
6b197249 | 854 | |
c2a0b538 JL |
855 | cap = dmar_readq(addr + DMAR_CAP_REG); |
856 | ecap = dmar_readq(addr + DMAR_ECAP_REG); | |
6b197249 JL |
857 | |
858 | if (arg) | |
859 | iounmap(addr); | |
860 | else | |
861 | early_iounmap(addr, VTD_PAGE_SIZE); | |
86cf898e | 862 | |
c2a0b538 JL |
863 | if (cap == (uint64_t)-1 && ecap == (uint64_t)-1) { |
864 | warn_invalid_dmar(drhd->address, " returns all ones"); | |
865 | return -EINVAL; | |
86cf898e | 866 | } |
2c992208 | 867 | |
2c992208 | 868 | return 0; |
86cf898e DW |
869 | } |
870 | ||
480125ba | 871 | int __init detect_intel_iommu(void) |
2ae21010 SS |
872 | { |
873 | int ret; | |
c2a0b538 JL |
874 | struct dmar_res_callback validate_drhd_cb = { |
875 | .cb[ACPI_DMAR_TYPE_HARDWARE_UNIT] = &dmar_validate_one_drhd, | |
876 | .ignore_unhandled = true, | |
877 | }; | |
2ae21010 | 878 | |
3a5670e8 | 879 | down_write(&dmar_global_lock); |
f6dd5c31 | 880 | ret = dmar_table_detect(); |
86cf898e | 881 | if (ret) |
c2a0b538 JL |
882 | ret = !dmar_walk_dmar_table((struct acpi_table_dmar *)dmar_tbl, |
883 | &validate_drhd_cb); | |
884 | if (ret && !no_iommu && !iommu_detected && !dmar_disabled) { | |
885 | iommu_detected = 1; | |
886 | /* Make sure ACS will be enabled */ | |
887 | pci_request_acs(); | |
888 | } | |
f5d1b97b | 889 | |
9d5ce73a | 890 | #ifdef CONFIG_X86 |
c2a0b538 JL |
891 | if (ret) |
892 | x86_init.iommu.iommu_init = intel_iommu_init; | |
2ae21010 | 893 | #endif |
c2a0b538 | 894 | |
b707cb02 | 895 | early_acpi_os_unmap_memory((void __iomem *)dmar_tbl, dmar_tbl_size); |
f6dd5c31 | 896 | dmar_tbl = NULL; |
3a5670e8 | 897 | up_write(&dmar_global_lock); |
480125ba | 898 | |
4db77ff3 | 899 | return ret ? 1 : -ENODEV; |
2ae21010 SS |
900 | } |
901 | ||
902 | ||
6f5cf521 DD |
903 | static void unmap_iommu(struct intel_iommu *iommu) |
904 | { | |
905 | iounmap(iommu->reg); | |
906 | release_mem_region(iommu->reg_phys, iommu->reg_size); | |
907 | } | |
908 | ||
909 | /** | |
910 | * map_iommu: map the iommu's registers | |
911 | * @iommu: the iommu to map | |
912 | * @phys_addr: the physical address of the base resgister | |
e9071b0b | 913 | * |
6f5cf521 | 914 | * Memory map the iommu's registers. Start w/ a single page, and |
e9071b0b | 915 | * possibly expand if that turns out to be insufficent. |
6f5cf521 DD |
916 | */ |
917 | static int map_iommu(struct intel_iommu *iommu, u64 phys_addr) | |
918 | { | |
919 | int map_size, err=0; | |
920 | ||
921 | iommu->reg_phys = phys_addr; | |
922 | iommu->reg_size = VTD_PAGE_SIZE; | |
923 | ||
924 | if (!request_mem_region(iommu->reg_phys, iommu->reg_size, iommu->name)) { | |
9f10e5bf | 925 | pr_err("Can't reserve memory\n"); |
6f5cf521 DD |
926 | err = -EBUSY; |
927 | goto out; | |
928 | } | |
929 | ||
930 | iommu->reg = ioremap(iommu->reg_phys, iommu->reg_size); | |
931 | if (!iommu->reg) { | |
9f10e5bf | 932 | pr_err("Can't map the region\n"); |
6f5cf521 DD |
933 | err = -ENOMEM; |
934 | goto release; | |
935 | } | |
936 | ||
937 | iommu->cap = dmar_readq(iommu->reg + DMAR_CAP_REG); | |
938 | iommu->ecap = dmar_readq(iommu->reg + DMAR_ECAP_REG); | |
939 | ||
940 | if (iommu->cap == (uint64_t)-1 && iommu->ecap == (uint64_t)-1) { | |
941 | err = -EINVAL; | |
942 | warn_invalid_dmar(phys_addr, " returns all ones"); | |
943 | goto unmap; | |
944 | } | |
945 | ||
946 | /* the registers might be more than one page */ | |
947 | map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap), | |
948 | cap_max_fault_reg_offset(iommu->cap)); | |
949 | map_size = VTD_PAGE_ALIGN(map_size); | |
950 | if (map_size > iommu->reg_size) { | |
951 | iounmap(iommu->reg); | |
952 | release_mem_region(iommu->reg_phys, iommu->reg_size); | |
953 | iommu->reg_size = map_size; | |
954 | if (!request_mem_region(iommu->reg_phys, iommu->reg_size, | |
955 | iommu->name)) { | |
9f10e5bf | 956 | pr_err("Can't reserve memory\n"); |
6f5cf521 DD |
957 | err = -EBUSY; |
958 | goto out; | |
959 | } | |
960 | iommu->reg = ioremap(iommu->reg_phys, iommu->reg_size); | |
961 | if (!iommu->reg) { | |
9f10e5bf | 962 | pr_err("Can't map the region\n"); |
6f5cf521 DD |
963 | err = -ENOMEM; |
964 | goto release; | |
965 | } | |
966 | } | |
967 | err = 0; | |
968 | goto out; | |
969 | ||
970 | unmap: | |
971 | iounmap(iommu->reg); | |
972 | release: | |
973 | release_mem_region(iommu->reg_phys, iommu->reg_size); | |
974 | out: | |
975 | return err; | |
976 | } | |
977 | ||
78d8e704 JL |
978 | static int dmar_alloc_seq_id(struct intel_iommu *iommu) |
979 | { | |
980 | iommu->seq_id = find_first_zero_bit(dmar_seq_ids, | |
981 | DMAR_UNITS_SUPPORTED); | |
982 | if (iommu->seq_id >= DMAR_UNITS_SUPPORTED) { | |
983 | iommu->seq_id = -1; | |
984 | } else { | |
985 | set_bit(iommu->seq_id, dmar_seq_ids); | |
986 | sprintf(iommu->name, "dmar%d", iommu->seq_id); | |
987 | } | |
988 | ||
989 | return iommu->seq_id; | |
990 | } | |
991 | ||
992 | static void dmar_free_seq_id(struct intel_iommu *iommu) | |
993 | { | |
994 | if (iommu->seq_id >= 0) { | |
995 | clear_bit(iommu->seq_id, dmar_seq_ids); | |
996 | iommu->seq_id = -1; | |
997 | } | |
998 | } | |
999 | ||
694835dc | 1000 | static int alloc_iommu(struct dmar_drhd_unit *drhd) |
e61d98d8 | 1001 | { |
c42d9f32 | 1002 | struct intel_iommu *iommu; |
3a93c841 | 1003 | u32 ver, sts; |
43f7392b | 1004 | int agaw = 0; |
4ed0d3e6 | 1005 | int msagaw = 0; |
6f5cf521 | 1006 | int err; |
c42d9f32 | 1007 | |
6ecbf01c | 1008 | if (!drhd->reg_base_addr) { |
3a8663ee | 1009 | warn_invalid_dmar(0, ""); |
6ecbf01c DW |
1010 | return -EINVAL; |
1011 | } | |
1012 | ||
c42d9f32 SS |
1013 | iommu = kzalloc(sizeof(*iommu), GFP_KERNEL); |
1014 | if (!iommu) | |
1886e8a9 | 1015 | return -ENOMEM; |
c42d9f32 | 1016 | |
78d8e704 | 1017 | if (dmar_alloc_seq_id(iommu) < 0) { |
9f10e5bf | 1018 | pr_err("Failed to allocate seq_id\n"); |
78d8e704 JL |
1019 | err = -ENOSPC; |
1020 | goto error; | |
1021 | } | |
e61d98d8 | 1022 | |
6f5cf521 DD |
1023 | err = map_iommu(iommu, drhd->reg_base_addr); |
1024 | if (err) { | |
9f10e5bf | 1025 | pr_err("Failed to map %s\n", iommu->name); |
78d8e704 | 1026 | goto error_free_seq_id; |
e61d98d8 | 1027 | } |
0815565a | 1028 | |
6f5cf521 | 1029 | err = -EINVAL; |
1b573683 WH |
1030 | agaw = iommu_calculate_agaw(iommu); |
1031 | if (agaw < 0) { | |
bf947fcb DD |
1032 | pr_err("Cannot get a valid agaw for iommu (seq_id = %d)\n", |
1033 | iommu->seq_id); | |
0815565a | 1034 | goto err_unmap; |
4ed0d3e6 FY |
1035 | } |
1036 | msagaw = iommu_calculate_max_sagaw(iommu); | |
1037 | if (msagaw < 0) { | |
bf947fcb | 1038 | pr_err("Cannot get a valid max agaw for iommu (seq_id = %d)\n", |
1b573683 | 1039 | iommu->seq_id); |
0815565a | 1040 | goto err_unmap; |
1b573683 WH |
1041 | } |
1042 | iommu->agaw = agaw; | |
4ed0d3e6 | 1043 | iommu->msagaw = msagaw; |
67ccac41 | 1044 | iommu->segment = drhd->segment; |
1b573683 | 1045 | |
ee34b32d SS |
1046 | iommu->node = -1; |
1047 | ||
e61d98d8 | 1048 | ver = readl(iommu->reg + DMAR_VER_REG); |
9f10e5bf JR |
1049 | pr_info("%s: reg_base_addr %llx ver %d:%d cap %llx ecap %llx\n", |
1050 | iommu->name, | |
5b6985ce FY |
1051 | (unsigned long long)drhd->reg_base_addr, |
1052 | DMAR_VER_MAJOR(ver), DMAR_VER_MINOR(ver), | |
1053 | (unsigned long long)iommu->cap, | |
1054 | (unsigned long long)iommu->ecap); | |
e61d98d8 | 1055 | |
3a93c841 TI |
1056 | /* Reflect status in gcmd */ |
1057 | sts = readl(iommu->reg + DMAR_GSTS_REG); | |
1058 | if (sts & DMA_GSTS_IRES) | |
1059 | iommu->gcmd |= DMA_GCMD_IRE; | |
1060 | if (sts & DMA_GSTS_TES) | |
1061 | iommu->gcmd |= DMA_GCMD_TE; | |
1062 | if (sts & DMA_GSTS_QIES) | |
1063 | iommu->gcmd |= DMA_GCMD_QIE; | |
1064 | ||
1f5b3c3f | 1065 | raw_spin_lock_init(&iommu->register_lock); |
e61d98d8 | 1066 | |
bc847454 | 1067 | if (intel_iommu_enabled) { |
a5459cfe AW |
1068 | iommu->iommu_dev = iommu_device_create(NULL, iommu, |
1069 | intel_iommu_groups, | |
2439d4aa | 1070 | "%s", iommu->name); |
a5459cfe | 1071 | |
bc847454 JR |
1072 | if (IS_ERR(iommu->iommu_dev)) { |
1073 | err = PTR_ERR(iommu->iommu_dev); | |
1074 | goto err_unmap; | |
1075 | } | |
59203379 NK |
1076 | } |
1077 | ||
bc847454 JR |
1078 | drhd->iommu = iommu; |
1079 | ||
1886e8a9 | 1080 | return 0; |
0815565a | 1081 | |
78d8e704 | 1082 | err_unmap: |
6f5cf521 | 1083 | unmap_iommu(iommu); |
78d8e704 JL |
1084 | error_free_seq_id: |
1085 | dmar_free_seq_id(iommu); | |
1086 | error: | |
e61d98d8 | 1087 | kfree(iommu); |
6f5cf521 | 1088 | return err; |
e61d98d8 SS |
1089 | } |
1090 | ||
a868e6b7 | 1091 | static void free_iommu(struct intel_iommu *iommu) |
e61d98d8 | 1092 | { |
a5459cfe AW |
1093 | iommu_device_destroy(iommu->iommu_dev); |
1094 | ||
a868e6b7 | 1095 | if (iommu->irq) { |
1208225c DW |
1096 | if (iommu->pr_irq) { |
1097 | free_irq(iommu->pr_irq, iommu); | |
1098 | dmar_free_hwirq(iommu->pr_irq); | |
1099 | iommu->pr_irq = 0; | |
1100 | } | |
a868e6b7 | 1101 | free_irq(iommu->irq, iommu); |
a553b142 | 1102 | dmar_free_hwirq(iommu->irq); |
34742db8 | 1103 | iommu->irq = 0; |
a868e6b7 | 1104 | } |
e61d98d8 | 1105 | |
a84da70b JL |
1106 | if (iommu->qi) { |
1107 | free_page((unsigned long)iommu->qi->desc); | |
1108 | kfree(iommu->qi->desc_status); | |
1109 | kfree(iommu->qi); | |
1110 | } | |
1111 | ||
e61d98d8 | 1112 | if (iommu->reg) |
6f5cf521 DD |
1113 | unmap_iommu(iommu); |
1114 | ||
78d8e704 | 1115 | dmar_free_seq_id(iommu); |
e61d98d8 SS |
1116 | kfree(iommu); |
1117 | } | |
fe962e90 SS |
1118 | |
1119 | /* | |
1120 | * Reclaim all the submitted descriptors which have completed its work. | |
1121 | */ | |
1122 | static inline void reclaim_free_desc(struct q_inval *qi) | |
1123 | { | |
6ba6c3a4 YZ |
1124 | while (qi->desc_status[qi->free_tail] == QI_DONE || |
1125 | qi->desc_status[qi->free_tail] == QI_ABORT) { | |
fe962e90 SS |
1126 | qi->desc_status[qi->free_tail] = QI_FREE; |
1127 | qi->free_tail = (qi->free_tail + 1) % QI_LENGTH; | |
1128 | qi->free_cnt++; | |
1129 | } | |
1130 | } | |
1131 | ||
704126ad YZ |
1132 | static int qi_check_fault(struct intel_iommu *iommu, int index) |
1133 | { | |
1134 | u32 fault; | |
6ba6c3a4 | 1135 | int head, tail; |
704126ad YZ |
1136 | struct q_inval *qi = iommu->qi; |
1137 | int wait_index = (index + 1) % QI_LENGTH; | |
1138 | ||
6ba6c3a4 YZ |
1139 | if (qi->desc_status[wait_index] == QI_ABORT) |
1140 | return -EAGAIN; | |
1141 | ||
704126ad YZ |
1142 | fault = readl(iommu->reg + DMAR_FSTS_REG); |
1143 | ||
1144 | /* | |
1145 | * If IQE happens, the head points to the descriptor associated | |
1146 | * with the error. No new descriptors are fetched until the IQE | |
1147 | * is cleared. | |
1148 | */ | |
1149 | if (fault & DMA_FSTS_IQE) { | |
1150 | head = readl(iommu->reg + DMAR_IQH_REG); | |
6ba6c3a4 | 1151 | if ((head >> DMAR_IQ_SHIFT) == index) { |
bf947fcb | 1152 | pr_err("VT-d detected invalid descriptor: " |
6ba6c3a4 YZ |
1153 | "low=%llx, high=%llx\n", |
1154 | (unsigned long long)qi->desc[index].low, | |
1155 | (unsigned long long)qi->desc[index].high); | |
704126ad YZ |
1156 | memcpy(&qi->desc[index], &qi->desc[wait_index], |
1157 | sizeof(struct qi_desc)); | |
1158 | __iommu_flush_cache(iommu, &qi->desc[index], | |
1159 | sizeof(struct qi_desc)); | |
1160 | writel(DMA_FSTS_IQE, iommu->reg + DMAR_FSTS_REG); | |
1161 | return -EINVAL; | |
1162 | } | |
1163 | } | |
1164 | ||
6ba6c3a4 YZ |
1165 | /* |
1166 | * If ITE happens, all pending wait_desc commands are aborted. | |
1167 | * No new descriptors are fetched until the ITE is cleared. | |
1168 | */ | |
1169 | if (fault & DMA_FSTS_ITE) { | |
1170 | head = readl(iommu->reg + DMAR_IQH_REG); | |
1171 | head = ((head >> DMAR_IQ_SHIFT) - 1 + QI_LENGTH) % QI_LENGTH; | |
1172 | head |= 1; | |
1173 | tail = readl(iommu->reg + DMAR_IQT_REG); | |
1174 | tail = ((tail >> DMAR_IQ_SHIFT) - 1 + QI_LENGTH) % QI_LENGTH; | |
1175 | ||
1176 | writel(DMA_FSTS_ITE, iommu->reg + DMAR_FSTS_REG); | |
1177 | ||
1178 | do { | |
1179 | if (qi->desc_status[head] == QI_IN_USE) | |
1180 | qi->desc_status[head] = QI_ABORT; | |
1181 | head = (head - 2 + QI_LENGTH) % QI_LENGTH; | |
1182 | } while (head != tail); | |
1183 | ||
1184 | if (qi->desc_status[wait_index] == QI_ABORT) | |
1185 | return -EAGAIN; | |
1186 | } | |
1187 | ||
1188 | if (fault & DMA_FSTS_ICE) | |
1189 | writel(DMA_FSTS_ICE, iommu->reg + DMAR_FSTS_REG); | |
1190 | ||
704126ad YZ |
1191 | return 0; |
1192 | } | |
1193 | ||
fe962e90 SS |
1194 | /* |
1195 | * Submit the queued invalidation descriptor to the remapping | |
1196 | * hardware unit and wait for its completion. | |
1197 | */ | |
704126ad | 1198 | int qi_submit_sync(struct qi_desc *desc, struct intel_iommu *iommu) |
fe962e90 | 1199 | { |
6ba6c3a4 | 1200 | int rc; |
fe962e90 SS |
1201 | struct q_inval *qi = iommu->qi; |
1202 | struct qi_desc *hw, wait_desc; | |
1203 | int wait_index, index; | |
1204 | unsigned long flags; | |
1205 | ||
1206 | if (!qi) | |
704126ad | 1207 | return 0; |
fe962e90 SS |
1208 | |
1209 | hw = qi->desc; | |
1210 | ||
6ba6c3a4 YZ |
1211 | restart: |
1212 | rc = 0; | |
1213 | ||
3b8f4048 | 1214 | raw_spin_lock_irqsave(&qi->q_lock, flags); |
fe962e90 | 1215 | while (qi->free_cnt < 3) { |
3b8f4048 | 1216 | raw_spin_unlock_irqrestore(&qi->q_lock, flags); |
fe962e90 | 1217 | cpu_relax(); |
3b8f4048 | 1218 | raw_spin_lock_irqsave(&qi->q_lock, flags); |
fe962e90 SS |
1219 | } |
1220 | ||
1221 | index = qi->free_head; | |
1222 | wait_index = (index + 1) % QI_LENGTH; | |
1223 | ||
1224 | qi->desc_status[index] = qi->desc_status[wait_index] = QI_IN_USE; | |
1225 | ||
1226 | hw[index] = *desc; | |
1227 | ||
704126ad YZ |
1228 | wait_desc.low = QI_IWD_STATUS_DATA(QI_DONE) | |
1229 | QI_IWD_STATUS_WRITE | QI_IWD_TYPE; | |
fe962e90 SS |
1230 | wait_desc.high = virt_to_phys(&qi->desc_status[wait_index]); |
1231 | ||
1232 | hw[wait_index] = wait_desc; | |
1233 | ||
1234 | __iommu_flush_cache(iommu, &hw[index], sizeof(struct qi_desc)); | |
1235 | __iommu_flush_cache(iommu, &hw[wait_index], sizeof(struct qi_desc)); | |
1236 | ||
1237 | qi->free_head = (qi->free_head + 2) % QI_LENGTH; | |
1238 | qi->free_cnt -= 2; | |
1239 | ||
fe962e90 SS |
1240 | /* |
1241 | * update the HW tail register indicating the presence of | |
1242 | * new descriptors. | |
1243 | */ | |
6ba6c3a4 | 1244 | writel(qi->free_head << DMAR_IQ_SHIFT, iommu->reg + DMAR_IQT_REG); |
fe962e90 SS |
1245 | |
1246 | while (qi->desc_status[wait_index] != QI_DONE) { | |
f05810c9 SS |
1247 | /* |
1248 | * We will leave the interrupts disabled, to prevent interrupt | |
1249 | * context to queue another cmd while a cmd is already submitted | |
1250 | * and waiting for completion on this cpu. This is to avoid | |
1251 | * a deadlock where the interrupt context can wait indefinitely | |
1252 | * for free slots in the queue. | |
1253 | */ | |
704126ad YZ |
1254 | rc = qi_check_fault(iommu, index); |
1255 | if (rc) | |
6ba6c3a4 | 1256 | break; |
704126ad | 1257 | |
3b8f4048 | 1258 | raw_spin_unlock(&qi->q_lock); |
fe962e90 | 1259 | cpu_relax(); |
3b8f4048 | 1260 | raw_spin_lock(&qi->q_lock); |
fe962e90 | 1261 | } |
6ba6c3a4 YZ |
1262 | |
1263 | qi->desc_status[index] = QI_DONE; | |
fe962e90 SS |
1264 | |
1265 | reclaim_free_desc(qi); | |
3b8f4048 | 1266 | raw_spin_unlock_irqrestore(&qi->q_lock, flags); |
704126ad | 1267 | |
6ba6c3a4 YZ |
1268 | if (rc == -EAGAIN) |
1269 | goto restart; | |
1270 | ||
704126ad | 1271 | return rc; |
fe962e90 SS |
1272 | } |
1273 | ||
1274 | /* | |
1275 | * Flush the global interrupt entry cache. | |
1276 | */ | |
1277 | void qi_global_iec(struct intel_iommu *iommu) | |
1278 | { | |
1279 | struct qi_desc desc; | |
1280 | ||
1281 | desc.low = QI_IEC_TYPE; | |
1282 | desc.high = 0; | |
1283 | ||
704126ad | 1284 | /* should never fail */ |
fe962e90 SS |
1285 | qi_submit_sync(&desc, iommu); |
1286 | } | |
1287 | ||
4c25a2c1 DW |
1288 | void qi_flush_context(struct intel_iommu *iommu, u16 did, u16 sid, u8 fm, |
1289 | u64 type) | |
3481f210 | 1290 | { |
3481f210 YS |
1291 | struct qi_desc desc; |
1292 | ||
3481f210 YS |
1293 | desc.low = QI_CC_FM(fm) | QI_CC_SID(sid) | QI_CC_DID(did) |
1294 | | QI_CC_GRAN(type) | QI_CC_TYPE; | |
1295 | desc.high = 0; | |
1296 | ||
4c25a2c1 | 1297 | qi_submit_sync(&desc, iommu); |
3481f210 YS |
1298 | } |
1299 | ||
1f0ef2aa DW |
1300 | void qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr, |
1301 | unsigned int size_order, u64 type) | |
3481f210 YS |
1302 | { |
1303 | u8 dw = 0, dr = 0; | |
1304 | ||
1305 | struct qi_desc desc; | |
1306 | int ih = 0; | |
1307 | ||
3481f210 YS |
1308 | if (cap_write_drain(iommu->cap)) |
1309 | dw = 1; | |
1310 | ||
1311 | if (cap_read_drain(iommu->cap)) | |
1312 | dr = 1; | |
1313 | ||
1314 | desc.low = QI_IOTLB_DID(did) | QI_IOTLB_DR(dr) | QI_IOTLB_DW(dw) | |
1315 | | QI_IOTLB_GRAN(type) | QI_IOTLB_TYPE; | |
1316 | desc.high = QI_IOTLB_ADDR(addr) | QI_IOTLB_IH(ih) | |
1317 | | QI_IOTLB_AM(size_order); | |
1318 | ||
1f0ef2aa | 1319 | qi_submit_sync(&desc, iommu); |
3481f210 YS |
1320 | } |
1321 | ||
6ba6c3a4 YZ |
1322 | void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 qdep, |
1323 | u64 addr, unsigned mask) | |
1324 | { | |
1325 | struct qi_desc desc; | |
1326 | ||
1327 | if (mask) { | |
1328 | BUG_ON(addr & ((1 << (VTD_PAGE_SHIFT + mask)) - 1)); | |
1329 | addr |= (1 << (VTD_PAGE_SHIFT + mask - 1)) - 1; | |
1330 | desc.high = QI_DEV_IOTLB_ADDR(addr) | QI_DEV_IOTLB_SIZE; | |
1331 | } else | |
1332 | desc.high = QI_DEV_IOTLB_ADDR(addr); | |
1333 | ||
1334 | if (qdep >= QI_DEV_IOTLB_MAX_INVS) | |
1335 | qdep = 0; | |
1336 | ||
1337 | desc.low = QI_DEV_IOTLB_SID(sid) | QI_DEV_IOTLB_QDEP(qdep) | | |
1338 | QI_DIOTLB_TYPE; | |
1339 | ||
1340 | qi_submit_sync(&desc, iommu); | |
1341 | } | |
1342 | ||
eba67e5d SS |
1343 | /* |
1344 | * Disable Queued Invalidation interface. | |
1345 | */ | |
1346 | void dmar_disable_qi(struct intel_iommu *iommu) | |
1347 | { | |
1348 | unsigned long flags; | |
1349 | u32 sts; | |
1350 | cycles_t start_time = get_cycles(); | |
1351 | ||
1352 | if (!ecap_qis(iommu->ecap)) | |
1353 | return; | |
1354 | ||
1f5b3c3f | 1355 | raw_spin_lock_irqsave(&iommu->register_lock, flags); |
eba67e5d | 1356 | |
fda3bec1 | 1357 | sts = readl(iommu->reg + DMAR_GSTS_REG); |
eba67e5d SS |
1358 | if (!(sts & DMA_GSTS_QIES)) |
1359 | goto end; | |
1360 | ||
1361 | /* | |
1362 | * Give a chance to HW to complete the pending invalidation requests. | |
1363 | */ | |
1364 | while ((readl(iommu->reg + DMAR_IQT_REG) != | |
1365 | readl(iommu->reg + DMAR_IQH_REG)) && | |
1366 | (DMAR_OPERATION_TIMEOUT > (get_cycles() - start_time))) | |
1367 | cpu_relax(); | |
1368 | ||
1369 | iommu->gcmd &= ~DMA_GCMD_QIE; | |
eba67e5d SS |
1370 | writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); |
1371 | ||
1372 | IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, | |
1373 | !(sts & DMA_GSTS_QIES), sts); | |
1374 | end: | |
1f5b3c3f | 1375 | raw_spin_unlock_irqrestore(&iommu->register_lock, flags); |
eba67e5d SS |
1376 | } |
1377 | ||
eb4a52bc FY |
1378 | /* |
1379 | * Enable queued invalidation. | |
1380 | */ | |
1381 | static void __dmar_enable_qi(struct intel_iommu *iommu) | |
1382 | { | |
c416daa9 | 1383 | u32 sts; |
eb4a52bc FY |
1384 | unsigned long flags; |
1385 | struct q_inval *qi = iommu->qi; | |
1386 | ||
1387 | qi->free_head = qi->free_tail = 0; | |
1388 | qi->free_cnt = QI_LENGTH; | |
1389 | ||
1f5b3c3f | 1390 | raw_spin_lock_irqsave(&iommu->register_lock, flags); |
eb4a52bc FY |
1391 | |
1392 | /* write zero to the tail reg */ | |
1393 | writel(0, iommu->reg + DMAR_IQT_REG); | |
1394 | ||
1395 | dmar_writeq(iommu->reg + DMAR_IQA_REG, virt_to_phys(qi->desc)); | |
1396 | ||
eb4a52bc | 1397 | iommu->gcmd |= DMA_GCMD_QIE; |
c416daa9 | 1398 | writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); |
eb4a52bc FY |
1399 | |
1400 | /* Make sure hardware complete it */ | |
1401 | IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, (sts & DMA_GSTS_QIES), sts); | |
1402 | ||
1f5b3c3f | 1403 | raw_spin_unlock_irqrestore(&iommu->register_lock, flags); |
eb4a52bc FY |
1404 | } |
1405 | ||
fe962e90 SS |
1406 | /* |
1407 | * Enable Queued Invalidation interface. This is a must to support | |
1408 | * interrupt-remapping. Also used by DMA-remapping, which replaces | |
1409 | * register based IOTLB invalidation. | |
1410 | */ | |
1411 | int dmar_enable_qi(struct intel_iommu *iommu) | |
1412 | { | |
fe962e90 | 1413 | struct q_inval *qi; |
751cafe3 | 1414 | struct page *desc_page; |
fe962e90 SS |
1415 | |
1416 | if (!ecap_qis(iommu->ecap)) | |
1417 | return -ENOENT; | |
1418 | ||
1419 | /* | |
1420 | * queued invalidation is already setup and enabled. | |
1421 | */ | |
1422 | if (iommu->qi) | |
1423 | return 0; | |
1424 | ||
fa4b57cc | 1425 | iommu->qi = kmalloc(sizeof(*qi), GFP_ATOMIC); |
fe962e90 SS |
1426 | if (!iommu->qi) |
1427 | return -ENOMEM; | |
1428 | ||
1429 | qi = iommu->qi; | |
1430 | ||
751cafe3 SS |
1431 | |
1432 | desc_page = alloc_pages_node(iommu->node, GFP_ATOMIC | __GFP_ZERO, 0); | |
1433 | if (!desc_page) { | |
fe962e90 | 1434 | kfree(qi); |
b707cb02 | 1435 | iommu->qi = NULL; |
fe962e90 SS |
1436 | return -ENOMEM; |
1437 | } | |
1438 | ||
751cafe3 SS |
1439 | qi->desc = page_address(desc_page); |
1440 | ||
37a40710 | 1441 | qi->desc_status = kzalloc(QI_LENGTH * sizeof(int), GFP_ATOMIC); |
fe962e90 SS |
1442 | if (!qi->desc_status) { |
1443 | free_page((unsigned long) qi->desc); | |
1444 | kfree(qi); | |
b707cb02 | 1445 | iommu->qi = NULL; |
fe962e90 SS |
1446 | return -ENOMEM; |
1447 | } | |
1448 | ||
3b8f4048 | 1449 | raw_spin_lock_init(&qi->q_lock); |
fe962e90 | 1450 | |
eb4a52bc | 1451 | __dmar_enable_qi(iommu); |
fe962e90 SS |
1452 | |
1453 | return 0; | |
1454 | } | |
0ac2491f SS |
1455 | |
1456 | /* iommu interrupt handling. Most stuff are MSI-like. */ | |
1457 | ||
9d783ba0 SS |
1458 | enum faulttype { |
1459 | DMA_REMAP, | |
1460 | INTR_REMAP, | |
1461 | UNKNOWN, | |
1462 | }; | |
1463 | ||
1464 | static const char *dma_remap_fault_reasons[] = | |
0ac2491f SS |
1465 | { |
1466 | "Software", | |
1467 | "Present bit in root entry is clear", | |
1468 | "Present bit in context entry is clear", | |
1469 | "Invalid context entry", | |
1470 | "Access beyond MGAW", | |
1471 | "PTE Write access is not set", | |
1472 | "PTE Read access is not set", | |
1473 | "Next page table ptr is invalid", | |
1474 | "Root table address invalid", | |
1475 | "Context table ptr is invalid", | |
1476 | "non-zero reserved fields in RTP", | |
1477 | "non-zero reserved fields in CTP", | |
1478 | "non-zero reserved fields in PTE", | |
4ecccd9e | 1479 | "PCE for translation request specifies blocking", |
0ac2491f | 1480 | }; |
9d783ba0 | 1481 | |
95a02e97 | 1482 | static const char *irq_remap_fault_reasons[] = |
9d783ba0 SS |
1483 | { |
1484 | "Detected reserved fields in the decoded interrupt-remapped request", | |
1485 | "Interrupt index exceeded the interrupt-remapping table size", | |
1486 | "Present field in the IRTE entry is clear", | |
1487 | "Error accessing interrupt-remapping table pointed by IRTA_REG", | |
1488 | "Detected reserved fields in the IRTE entry", | |
1489 | "Blocked a compatibility format interrupt request", | |
1490 | "Blocked an interrupt request due to source-id verification failure", | |
1491 | }; | |
1492 | ||
21004dcd | 1493 | static const char *dmar_get_fault_reason(u8 fault_reason, int *fault_type) |
0ac2491f | 1494 | { |
fefe1ed1 DC |
1495 | if (fault_reason >= 0x20 && (fault_reason - 0x20 < |
1496 | ARRAY_SIZE(irq_remap_fault_reasons))) { | |
9d783ba0 | 1497 | *fault_type = INTR_REMAP; |
95a02e97 | 1498 | return irq_remap_fault_reasons[fault_reason - 0x20]; |
9d783ba0 SS |
1499 | } else if (fault_reason < ARRAY_SIZE(dma_remap_fault_reasons)) { |
1500 | *fault_type = DMA_REMAP; | |
1501 | return dma_remap_fault_reasons[fault_reason]; | |
1502 | } else { | |
1503 | *fault_type = UNKNOWN; | |
0ac2491f | 1504 | return "Unknown"; |
9d783ba0 | 1505 | } |
0ac2491f SS |
1506 | } |
1507 | ||
1208225c DW |
1508 | |
1509 | static inline int dmar_msi_reg(struct intel_iommu *iommu, int irq) | |
1510 | { | |
1511 | if (iommu->irq == irq) | |
1512 | return DMAR_FECTL_REG; | |
1513 | else if (iommu->pr_irq == irq) | |
1514 | return DMAR_PECTL_REG; | |
1515 | else | |
1516 | BUG(); | |
1517 | } | |
1518 | ||
5c2837fb | 1519 | void dmar_msi_unmask(struct irq_data *data) |
0ac2491f | 1520 | { |
dced35ae | 1521 | struct intel_iommu *iommu = irq_data_get_irq_handler_data(data); |
1208225c | 1522 | int reg = dmar_msi_reg(iommu, data->irq); |
0ac2491f SS |
1523 | unsigned long flag; |
1524 | ||
1525 | /* unmask it */ | |
1f5b3c3f | 1526 | raw_spin_lock_irqsave(&iommu->register_lock, flag); |
1208225c | 1527 | writel(0, iommu->reg + reg); |
0ac2491f | 1528 | /* Read a reg to force flush the post write */ |
1208225c | 1529 | readl(iommu->reg + reg); |
1f5b3c3f | 1530 | raw_spin_unlock_irqrestore(&iommu->register_lock, flag); |
0ac2491f SS |
1531 | } |
1532 | ||
5c2837fb | 1533 | void dmar_msi_mask(struct irq_data *data) |
0ac2491f | 1534 | { |
dced35ae | 1535 | struct intel_iommu *iommu = irq_data_get_irq_handler_data(data); |
1208225c DW |
1536 | int reg = dmar_msi_reg(iommu, data->irq); |
1537 | unsigned long flag; | |
0ac2491f SS |
1538 | |
1539 | /* mask it */ | |
1f5b3c3f | 1540 | raw_spin_lock_irqsave(&iommu->register_lock, flag); |
1208225c | 1541 | writel(DMA_FECTL_IM, iommu->reg + reg); |
0ac2491f | 1542 | /* Read a reg to force flush the post write */ |
1208225c | 1543 | readl(iommu->reg + reg); |
1f5b3c3f | 1544 | raw_spin_unlock_irqrestore(&iommu->register_lock, flag); |
0ac2491f SS |
1545 | } |
1546 | ||
1547 | void dmar_msi_write(int irq, struct msi_msg *msg) | |
1548 | { | |
dced35ae | 1549 | struct intel_iommu *iommu = irq_get_handler_data(irq); |
1208225c | 1550 | int reg = dmar_msi_reg(iommu, irq); |
0ac2491f SS |
1551 | unsigned long flag; |
1552 | ||
1f5b3c3f | 1553 | raw_spin_lock_irqsave(&iommu->register_lock, flag); |
1208225c DW |
1554 | writel(msg->data, iommu->reg + reg + 4); |
1555 | writel(msg->address_lo, iommu->reg + reg + 8); | |
1556 | writel(msg->address_hi, iommu->reg + reg + 12); | |
1f5b3c3f | 1557 | raw_spin_unlock_irqrestore(&iommu->register_lock, flag); |
0ac2491f SS |
1558 | } |
1559 | ||
1560 | void dmar_msi_read(int irq, struct msi_msg *msg) | |
1561 | { | |
dced35ae | 1562 | struct intel_iommu *iommu = irq_get_handler_data(irq); |
1208225c | 1563 | int reg = dmar_msi_reg(iommu, irq); |
0ac2491f SS |
1564 | unsigned long flag; |
1565 | ||
1f5b3c3f | 1566 | raw_spin_lock_irqsave(&iommu->register_lock, flag); |
1208225c DW |
1567 | msg->data = readl(iommu->reg + reg + 4); |
1568 | msg->address_lo = readl(iommu->reg + reg + 8); | |
1569 | msg->address_hi = readl(iommu->reg + reg + 12); | |
1f5b3c3f | 1570 | raw_spin_unlock_irqrestore(&iommu->register_lock, flag); |
0ac2491f SS |
1571 | } |
1572 | ||
1573 | static int dmar_fault_do_one(struct intel_iommu *iommu, int type, | |
1574 | u8 fault_reason, u16 source_id, unsigned long long addr) | |
1575 | { | |
1576 | const char *reason; | |
9d783ba0 | 1577 | int fault_type; |
0ac2491f | 1578 | |
9d783ba0 | 1579 | reason = dmar_get_fault_reason(fault_reason, &fault_type); |
0ac2491f | 1580 | |
9d783ba0 | 1581 | if (fault_type == INTR_REMAP) |
bf947fcb | 1582 | pr_err("INTR-REMAP: Request device [[%02x:%02x.%d] " |
9d783ba0 SS |
1583 | "fault index %llx\n" |
1584 | "INTR-REMAP:[fault reason %02d] %s\n", | |
1585 | (source_id >> 8), PCI_SLOT(source_id & 0xFF), | |
1586 | PCI_FUNC(source_id & 0xFF), addr >> 48, | |
1587 | fault_reason, reason); | |
1588 | else | |
bf947fcb | 1589 | pr_err("DMAR:[%s] Request device [%02x:%02x.%d] " |
9d783ba0 SS |
1590 | "fault addr %llx \n" |
1591 | "DMAR:[fault reason %02d] %s\n", | |
1592 | (type ? "DMA Read" : "DMA Write"), | |
1593 | (source_id >> 8), PCI_SLOT(source_id & 0xFF), | |
1594 | PCI_FUNC(source_id & 0xFF), addr, fault_reason, reason); | |
0ac2491f SS |
1595 | return 0; |
1596 | } | |
1597 | ||
1598 | #define PRIMARY_FAULT_REG_LEN (16) | |
1531a6a6 | 1599 | irqreturn_t dmar_fault(int irq, void *dev_id) |
0ac2491f SS |
1600 | { |
1601 | struct intel_iommu *iommu = dev_id; | |
1602 | int reg, fault_index; | |
1603 | u32 fault_status; | |
1604 | unsigned long flag; | |
1605 | ||
1f5b3c3f | 1606 | raw_spin_lock_irqsave(&iommu->register_lock, flag); |
0ac2491f | 1607 | fault_status = readl(iommu->reg + DMAR_FSTS_REG); |
9d783ba0 | 1608 | if (fault_status) |
bf947fcb | 1609 | pr_err("DRHD: handling fault status reg %x\n", fault_status); |
0ac2491f SS |
1610 | |
1611 | /* TBD: ignore advanced fault log currently */ | |
1612 | if (!(fault_status & DMA_FSTS_PPF)) | |
bd5cdad0 | 1613 | goto unlock_exit; |
0ac2491f SS |
1614 | |
1615 | fault_index = dma_fsts_fault_record_index(fault_status); | |
1616 | reg = cap_fault_reg_offset(iommu->cap); | |
1617 | while (1) { | |
1618 | u8 fault_reason; | |
1619 | u16 source_id; | |
1620 | u64 guest_addr; | |
1621 | int type; | |
1622 | u32 data; | |
1623 | ||
1624 | /* highest 32 bits */ | |
1625 | data = readl(iommu->reg + reg + | |
1626 | fault_index * PRIMARY_FAULT_REG_LEN + 12); | |
1627 | if (!(data & DMA_FRCD_F)) | |
1628 | break; | |
1629 | ||
1630 | fault_reason = dma_frcd_fault_reason(data); | |
1631 | type = dma_frcd_type(data); | |
1632 | ||
1633 | data = readl(iommu->reg + reg + | |
1634 | fault_index * PRIMARY_FAULT_REG_LEN + 8); | |
1635 | source_id = dma_frcd_source_id(data); | |
1636 | ||
1637 | guest_addr = dmar_readq(iommu->reg + reg + | |
1638 | fault_index * PRIMARY_FAULT_REG_LEN); | |
1639 | guest_addr = dma_frcd_page_addr(guest_addr); | |
1640 | /* clear the fault */ | |
1641 | writel(DMA_FRCD_F, iommu->reg + reg + | |
1642 | fault_index * PRIMARY_FAULT_REG_LEN + 12); | |
1643 | ||
1f5b3c3f | 1644 | raw_spin_unlock_irqrestore(&iommu->register_lock, flag); |
0ac2491f SS |
1645 | |
1646 | dmar_fault_do_one(iommu, type, fault_reason, | |
1647 | source_id, guest_addr); | |
1648 | ||
1649 | fault_index++; | |
8211a7b5 | 1650 | if (fault_index >= cap_num_fault_regs(iommu->cap)) |
0ac2491f | 1651 | fault_index = 0; |
1f5b3c3f | 1652 | raw_spin_lock_irqsave(&iommu->register_lock, flag); |
0ac2491f | 1653 | } |
0ac2491f | 1654 | |
bd5cdad0 LZH |
1655 | writel(DMA_FSTS_PFO | DMA_FSTS_PPF, iommu->reg + DMAR_FSTS_REG); |
1656 | ||
1657 | unlock_exit: | |
1f5b3c3f | 1658 | raw_spin_unlock_irqrestore(&iommu->register_lock, flag); |
0ac2491f SS |
1659 | return IRQ_HANDLED; |
1660 | } | |
1661 | ||
1662 | int dmar_set_interrupt(struct intel_iommu *iommu) | |
1663 | { | |
1664 | int irq, ret; | |
1665 | ||
9d783ba0 SS |
1666 | /* |
1667 | * Check if the fault interrupt is already initialized. | |
1668 | */ | |
1669 | if (iommu->irq) | |
1670 | return 0; | |
1671 | ||
34742db8 JL |
1672 | irq = dmar_alloc_hwirq(iommu->seq_id, iommu->node, iommu); |
1673 | if (irq > 0) { | |
1674 | iommu->irq = irq; | |
1675 | } else { | |
9f10e5bf | 1676 | pr_err("No free IRQ vectors\n"); |
0ac2491f SS |
1677 | return -EINVAL; |
1678 | } | |
1679 | ||
477694e7 | 1680 | ret = request_irq(irq, dmar_fault, IRQF_NO_THREAD, iommu->name, iommu); |
0ac2491f | 1681 | if (ret) |
9f10e5bf | 1682 | pr_err("Can't request irq\n"); |
0ac2491f SS |
1683 | return ret; |
1684 | } | |
9d783ba0 SS |
1685 | |
1686 | int __init enable_drhd_fault_handling(void) | |
1687 | { | |
1688 | struct dmar_drhd_unit *drhd; | |
7c919779 | 1689 | struct intel_iommu *iommu; |
9d783ba0 SS |
1690 | |
1691 | /* | |
1692 | * Enable fault control interrupt. | |
1693 | */ | |
7c919779 | 1694 | for_each_iommu(iommu, drhd) { |
bd5cdad0 | 1695 | u32 fault_status; |
7c919779 | 1696 | int ret = dmar_set_interrupt(iommu); |
9d783ba0 SS |
1697 | |
1698 | if (ret) { | |
e9071b0b | 1699 | pr_err("DRHD %Lx: failed to enable fault, interrupt, ret %d\n", |
9d783ba0 SS |
1700 | (unsigned long long)drhd->reg_base_addr, ret); |
1701 | return -1; | |
1702 | } | |
7f99d946 SS |
1703 | |
1704 | /* | |
1705 | * Clear any previous faults. | |
1706 | */ | |
1707 | dmar_fault(iommu->irq, iommu); | |
bd5cdad0 LZH |
1708 | fault_status = readl(iommu->reg + DMAR_FSTS_REG); |
1709 | writel(fault_status, iommu->reg + DMAR_FSTS_REG); | |
9d783ba0 SS |
1710 | } |
1711 | ||
1712 | return 0; | |
1713 | } | |
eb4a52bc FY |
1714 | |
1715 | /* | |
1716 | * Re-enable Queued Invalidation interface. | |
1717 | */ | |
1718 | int dmar_reenable_qi(struct intel_iommu *iommu) | |
1719 | { | |
1720 | if (!ecap_qis(iommu->ecap)) | |
1721 | return -ENOENT; | |
1722 | ||
1723 | if (!iommu->qi) | |
1724 | return -ENOENT; | |
1725 | ||
1726 | /* | |
1727 | * First disable queued invalidation. | |
1728 | */ | |
1729 | dmar_disable_qi(iommu); | |
1730 | /* | |
1731 | * Then enable queued invalidation again. Since there is no pending | |
1732 | * invalidation requests now, it's safe to re-enable queued | |
1733 | * invalidation. | |
1734 | */ | |
1735 | __dmar_enable_qi(iommu); | |
1736 | ||
1737 | return 0; | |
1738 | } | |
074835f0 YS |
1739 | |
1740 | /* | |
1741 | * Check interrupt remapping support in DMAR table description. | |
1742 | */ | |
0b8973a8 | 1743 | int __init dmar_ir_support(void) |
074835f0 YS |
1744 | { |
1745 | struct acpi_table_dmar *dmar; | |
1746 | dmar = (struct acpi_table_dmar *)dmar_tbl; | |
4f506e07 AP |
1747 | if (!dmar) |
1748 | return 0; | |
074835f0 YS |
1749 | return dmar->flags & 0x1; |
1750 | } | |
694835dc | 1751 | |
6b197249 JL |
1752 | /* Check whether DMAR units are in use */ |
1753 | static inline bool dmar_in_use(void) | |
1754 | { | |
1755 | return irq_remapping_enabled || intel_iommu_enabled; | |
1756 | } | |
1757 | ||
a868e6b7 JL |
1758 | static int __init dmar_free_unused_resources(void) |
1759 | { | |
1760 | struct dmar_drhd_unit *dmaru, *dmaru_n; | |
1761 | ||
6b197249 | 1762 | if (dmar_in_use()) |
a868e6b7 JL |
1763 | return 0; |
1764 | ||
2e455289 JL |
1765 | if (dmar_dev_scope_status != 1 && !list_empty(&dmar_drhd_units)) |
1766 | bus_unregister_notifier(&pci_bus_type, &dmar_pci_bus_nb); | |
59ce0515 | 1767 | |
3a5670e8 | 1768 | down_write(&dmar_global_lock); |
a868e6b7 JL |
1769 | list_for_each_entry_safe(dmaru, dmaru_n, &dmar_drhd_units, list) { |
1770 | list_del(&dmaru->list); | |
1771 | dmar_free_drhd(dmaru); | |
1772 | } | |
3a5670e8 | 1773 | up_write(&dmar_global_lock); |
a868e6b7 JL |
1774 | |
1775 | return 0; | |
1776 | } | |
1777 | ||
1778 | late_initcall(dmar_free_unused_resources); | |
4db77ff3 | 1779 | IOMMU_INIT_POST(detect_intel_iommu); |
6b197249 JL |
1780 | |
1781 | /* | |
1782 | * DMAR Hotplug Support | |
1783 | * For more details, please refer to Intel(R) Virtualization Technology | |
1784 | * for Directed-IO Architecture Specifiction, Rev 2.2, Section 8.8 | |
1785 | * "Remapping Hardware Unit Hot Plug". | |
1786 | */ | |
1787 | static u8 dmar_hp_uuid[] = { | |
1788 | /* 0000 */ 0xA6, 0xA3, 0xC1, 0xD8, 0x9B, 0xBE, 0x9B, 0x4C, | |
1789 | /* 0008 */ 0x91, 0xBF, 0xC3, 0xCB, 0x81, 0xFC, 0x5D, 0xAF | |
1790 | }; | |
1791 | ||
1792 | /* | |
1793 | * Currently there's only one revision and BIOS will not check the revision id, | |
1794 | * so use 0 for safety. | |
1795 | */ | |
1796 | #define DMAR_DSM_REV_ID 0 | |
1797 | #define DMAR_DSM_FUNC_DRHD 1 | |
1798 | #define DMAR_DSM_FUNC_ATSR 2 | |
1799 | #define DMAR_DSM_FUNC_RHSA 3 | |
1800 | ||
1801 | static inline bool dmar_detect_dsm(acpi_handle handle, int func) | |
1802 | { | |
1803 | return acpi_check_dsm(handle, dmar_hp_uuid, DMAR_DSM_REV_ID, 1 << func); | |
1804 | } | |
1805 | ||
1806 | static int dmar_walk_dsm_resource(acpi_handle handle, int func, | |
1807 | dmar_res_handler_t handler, void *arg) | |
1808 | { | |
1809 | int ret = -ENODEV; | |
1810 | union acpi_object *obj; | |
1811 | struct acpi_dmar_header *start; | |
1812 | struct dmar_res_callback callback; | |
1813 | static int res_type[] = { | |
1814 | [DMAR_DSM_FUNC_DRHD] = ACPI_DMAR_TYPE_HARDWARE_UNIT, | |
1815 | [DMAR_DSM_FUNC_ATSR] = ACPI_DMAR_TYPE_ROOT_ATS, | |
1816 | [DMAR_DSM_FUNC_RHSA] = ACPI_DMAR_TYPE_HARDWARE_AFFINITY, | |
1817 | }; | |
1818 | ||
1819 | if (!dmar_detect_dsm(handle, func)) | |
1820 | return 0; | |
1821 | ||
1822 | obj = acpi_evaluate_dsm_typed(handle, dmar_hp_uuid, DMAR_DSM_REV_ID, | |
1823 | func, NULL, ACPI_TYPE_BUFFER); | |
1824 | if (!obj) | |
1825 | return -ENODEV; | |
1826 | ||
1827 | memset(&callback, 0, sizeof(callback)); | |
1828 | callback.cb[res_type[func]] = handler; | |
1829 | callback.arg[res_type[func]] = arg; | |
1830 | start = (struct acpi_dmar_header *)obj->buffer.pointer; | |
1831 | ret = dmar_walk_remapping_entries(start, obj->buffer.length, &callback); | |
1832 | ||
1833 | ACPI_FREE(obj); | |
1834 | ||
1835 | return ret; | |
1836 | } | |
1837 | ||
1838 | static int dmar_hp_add_drhd(struct acpi_dmar_header *header, void *arg) | |
1839 | { | |
1840 | int ret; | |
1841 | struct dmar_drhd_unit *dmaru; | |
1842 | ||
1843 | dmaru = dmar_find_dmaru((struct acpi_dmar_hardware_unit *)header); | |
1844 | if (!dmaru) | |
1845 | return -ENODEV; | |
1846 | ||
1847 | ret = dmar_ir_hotplug(dmaru, true); | |
1848 | if (ret == 0) | |
1849 | ret = dmar_iommu_hotplug(dmaru, true); | |
1850 | ||
1851 | return ret; | |
1852 | } | |
1853 | ||
1854 | static int dmar_hp_remove_drhd(struct acpi_dmar_header *header, void *arg) | |
1855 | { | |
1856 | int i, ret; | |
1857 | struct device *dev; | |
1858 | struct dmar_drhd_unit *dmaru; | |
1859 | ||
1860 | dmaru = dmar_find_dmaru((struct acpi_dmar_hardware_unit *)header); | |
1861 | if (!dmaru) | |
1862 | return 0; | |
1863 | ||
1864 | /* | |
1865 | * All PCI devices managed by this unit should have been destroyed. | |
1866 | */ | |
1867 | if (!dmaru->include_all && dmaru->devices && dmaru->devices_cnt) | |
1868 | for_each_active_dev_scope(dmaru->devices, | |
1869 | dmaru->devices_cnt, i, dev) | |
1870 | return -EBUSY; | |
1871 | ||
1872 | ret = dmar_ir_hotplug(dmaru, false); | |
1873 | if (ret == 0) | |
1874 | ret = dmar_iommu_hotplug(dmaru, false); | |
1875 | ||
1876 | return ret; | |
1877 | } | |
1878 | ||
1879 | static int dmar_hp_release_drhd(struct acpi_dmar_header *header, void *arg) | |
1880 | { | |
1881 | struct dmar_drhd_unit *dmaru; | |
1882 | ||
1883 | dmaru = dmar_find_dmaru((struct acpi_dmar_hardware_unit *)header); | |
1884 | if (dmaru) { | |
1885 | list_del_rcu(&dmaru->list); | |
1886 | synchronize_rcu(); | |
1887 | dmar_free_drhd(dmaru); | |
1888 | } | |
1889 | ||
1890 | return 0; | |
1891 | } | |
1892 | ||
1893 | static int dmar_hotplug_insert(acpi_handle handle) | |
1894 | { | |
1895 | int ret; | |
1896 | int drhd_count = 0; | |
1897 | ||
1898 | ret = dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_DRHD, | |
1899 | &dmar_validate_one_drhd, (void *)1); | |
1900 | if (ret) | |
1901 | goto out; | |
1902 | ||
1903 | ret = dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_DRHD, | |
1904 | &dmar_parse_one_drhd, (void *)&drhd_count); | |
1905 | if (ret == 0 && drhd_count == 0) { | |
1906 | pr_warn(FW_BUG "No DRHD structures in buffer returned by _DSM method\n"); | |
1907 | goto out; | |
1908 | } else if (ret) { | |
1909 | goto release_drhd; | |
1910 | } | |
1911 | ||
1912 | ret = dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_RHSA, | |
1913 | &dmar_parse_one_rhsa, NULL); | |
1914 | if (ret) | |
1915 | goto release_drhd; | |
1916 | ||
1917 | ret = dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_ATSR, | |
1918 | &dmar_parse_one_atsr, NULL); | |
1919 | if (ret) | |
1920 | goto release_atsr; | |
1921 | ||
1922 | ret = dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_DRHD, | |
1923 | &dmar_hp_add_drhd, NULL); | |
1924 | if (!ret) | |
1925 | return 0; | |
1926 | ||
1927 | dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_DRHD, | |
1928 | &dmar_hp_remove_drhd, NULL); | |
1929 | release_atsr: | |
1930 | dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_ATSR, | |
1931 | &dmar_release_one_atsr, NULL); | |
1932 | release_drhd: | |
1933 | dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_DRHD, | |
1934 | &dmar_hp_release_drhd, NULL); | |
1935 | out: | |
1936 | return ret; | |
1937 | } | |
1938 | ||
1939 | static int dmar_hotplug_remove(acpi_handle handle) | |
1940 | { | |
1941 | int ret; | |
1942 | ||
1943 | ret = dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_ATSR, | |
1944 | &dmar_check_one_atsr, NULL); | |
1945 | if (ret) | |
1946 | return ret; | |
1947 | ||
1948 | ret = dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_DRHD, | |
1949 | &dmar_hp_remove_drhd, NULL); | |
1950 | if (ret == 0) { | |
1951 | WARN_ON(dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_ATSR, | |
1952 | &dmar_release_one_atsr, NULL)); | |
1953 | WARN_ON(dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_DRHD, | |
1954 | &dmar_hp_release_drhd, NULL)); | |
1955 | } else { | |
1956 | dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_DRHD, | |
1957 | &dmar_hp_add_drhd, NULL); | |
1958 | } | |
1959 | ||
1960 | return ret; | |
1961 | } | |
1962 | ||
d35165a9 JL |
1963 | static acpi_status dmar_get_dsm_handle(acpi_handle handle, u32 lvl, |
1964 | void *context, void **retval) | |
1965 | { | |
1966 | acpi_handle *phdl = retval; | |
1967 | ||
1968 | if (dmar_detect_dsm(handle, DMAR_DSM_FUNC_DRHD)) { | |
1969 | *phdl = handle; | |
1970 | return AE_CTRL_TERMINATE; | |
1971 | } | |
1972 | ||
1973 | return AE_OK; | |
1974 | } | |
1975 | ||
6b197249 JL |
1976 | static int dmar_device_hotplug(acpi_handle handle, bool insert) |
1977 | { | |
1978 | int ret; | |
d35165a9 JL |
1979 | acpi_handle tmp = NULL; |
1980 | acpi_status status; | |
6b197249 JL |
1981 | |
1982 | if (!dmar_in_use()) | |
1983 | return 0; | |
1984 | ||
d35165a9 JL |
1985 | if (dmar_detect_dsm(handle, DMAR_DSM_FUNC_DRHD)) { |
1986 | tmp = handle; | |
1987 | } else { | |
1988 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, | |
1989 | ACPI_UINT32_MAX, | |
1990 | dmar_get_dsm_handle, | |
1991 | NULL, NULL, &tmp); | |
1992 | if (ACPI_FAILURE(status)) { | |
1993 | pr_warn("Failed to locate _DSM method.\n"); | |
1994 | return -ENXIO; | |
1995 | } | |
1996 | } | |
1997 | if (tmp == NULL) | |
6b197249 JL |
1998 | return 0; |
1999 | ||
2000 | down_write(&dmar_global_lock); | |
2001 | if (insert) | |
d35165a9 | 2002 | ret = dmar_hotplug_insert(tmp); |
6b197249 | 2003 | else |
d35165a9 | 2004 | ret = dmar_hotplug_remove(tmp); |
6b197249 JL |
2005 | up_write(&dmar_global_lock); |
2006 | ||
2007 | return ret; | |
2008 | } | |
2009 | ||
2010 | int dmar_device_add(acpi_handle handle) | |
2011 | { | |
2012 | return dmar_device_hotplug(handle, true); | |
2013 | } | |
2014 | ||
2015 | int dmar_device_remove(acpi_handle handle) | |
2016 | { | |
2017 | return dmar_device_hotplug(handle, false); | |
2018 | } |