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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 | ||
e9071b0b DD |
29 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt /* has to precede printk.h */ |
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> |
8a8f422d | 41 | #include <asm/irq_remapping.h> |
4db77ff3 | 42 | #include <asm/iommu_table.h> |
10e5247f | 43 | |
078e1ee2 JR |
44 | #include "irq_remapping.h" |
45 | ||
10e5247f KA |
46 | /* No locks are needed as DMA remapping hardware unit |
47 | * list is constructed at boot time and hotplug of | |
48 | * these units are not supported by the architecture. | |
49 | */ | |
50 | LIST_HEAD(dmar_drhd_units); | |
10e5247f | 51 | |
41750d31 | 52 | struct acpi_table_header * __initdata dmar_tbl; |
8e1568f3 | 53 | static acpi_size dmar_tbl_size; |
10e5247f | 54 | |
694835dc | 55 | static int alloc_iommu(struct dmar_drhd_unit *drhd); |
a868e6b7 | 56 | static void free_iommu(struct intel_iommu *iommu); |
694835dc | 57 | |
10e5247f KA |
58 | static void __init dmar_register_drhd_unit(struct dmar_drhd_unit *drhd) |
59 | { | |
60 | /* | |
61 | * add INCLUDE_ALL at the tail, so scan the list will find it at | |
62 | * the very end. | |
63 | */ | |
64 | if (drhd->include_all) | |
65 | list_add_tail(&drhd->list, &dmar_drhd_units); | |
66 | else | |
67 | list_add(&drhd->list, &dmar_drhd_units); | |
68 | } | |
69 | ||
10e5247f KA |
70 | static int __init dmar_parse_one_dev_scope(struct acpi_dmar_device_scope *scope, |
71 | struct pci_dev **dev, u16 segment) | |
72 | { | |
73 | struct pci_bus *bus; | |
74 | struct pci_dev *pdev = NULL; | |
75 | struct acpi_dmar_pci_path *path; | |
76 | int count; | |
77 | ||
78 | bus = pci_find_bus(segment, scope->bus); | |
79 | path = (struct acpi_dmar_pci_path *)(scope + 1); | |
80 | count = (scope->length - sizeof(struct acpi_dmar_device_scope)) | |
81 | / sizeof(struct acpi_dmar_pci_path); | |
82 | ||
83 | while (count) { | |
84 | if (pdev) | |
85 | pci_dev_put(pdev); | |
86 | /* | |
87 | * Some BIOSes list non-exist devices in DMAR table, just | |
88 | * ignore it | |
89 | */ | |
90 | if (!bus) { | |
e9071b0b | 91 | pr_warn("Device scope bus [%d] not found\n", scope->bus); |
10e5247f KA |
92 | break; |
93 | } | |
fa5f508f | 94 | pdev = pci_get_slot(bus, PCI_DEVFN(path->device, path->function)); |
10e5247f | 95 | if (!pdev) { |
e9071b0b | 96 | /* warning will be printed below */ |
10e5247f KA |
97 | break; |
98 | } | |
99 | path ++; | |
100 | count --; | |
101 | bus = pdev->subordinate; | |
102 | } | |
103 | if (!pdev) { | |
e9071b0b | 104 | pr_warn("Device scope device [%04x:%02x:%02x.%02x] not found\n", |
fa5f508f | 105 | segment, scope->bus, path->device, path->function); |
10e5247f KA |
106 | return 0; |
107 | } | |
108 | if ((scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT && \ | |
109 | pdev->subordinate) || (scope->entry_type == \ | |
110 | ACPI_DMAR_SCOPE_TYPE_BRIDGE && !pdev->subordinate)) { | |
111 | pci_dev_put(pdev); | |
e9071b0b DD |
112 | pr_warn("Device scope type does not match for %s\n", |
113 | pci_name(pdev)); | |
10e5247f KA |
114 | return -EINVAL; |
115 | } | |
116 | *dev = pdev; | |
117 | return 0; | |
118 | } | |
119 | ||
318fe7df SS |
120 | int __init dmar_parse_dev_scope(void *start, void *end, int *cnt, |
121 | struct pci_dev ***devices, u16 segment) | |
10e5247f KA |
122 | { |
123 | struct acpi_dmar_device_scope *scope; | |
124 | void * tmp = start; | |
125 | int index; | |
126 | int ret; | |
127 | ||
128 | *cnt = 0; | |
129 | while (start < end) { | |
130 | scope = start; | |
131 | if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT || | |
132 | scope->entry_type == ACPI_DMAR_SCOPE_TYPE_BRIDGE) | |
133 | (*cnt)++; | |
ae3e7f3a LC |
134 | else if (scope->entry_type != ACPI_DMAR_SCOPE_TYPE_IOAPIC && |
135 | scope->entry_type != ACPI_DMAR_SCOPE_TYPE_HPET) { | |
e9071b0b | 136 | pr_warn("Unsupported device scope\n"); |
5715f0f9 | 137 | } |
10e5247f KA |
138 | start += scope->length; |
139 | } | |
140 | if (*cnt == 0) | |
141 | return 0; | |
142 | ||
143 | *devices = kcalloc(*cnt, sizeof(struct pci_dev *), GFP_KERNEL); | |
144 | if (!*devices) | |
145 | return -ENOMEM; | |
146 | ||
147 | start = tmp; | |
148 | index = 0; | |
149 | while (start < end) { | |
150 | scope = start; | |
151 | if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT || | |
152 | scope->entry_type == ACPI_DMAR_SCOPE_TYPE_BRIDGE) { | |
153 | ret = dmar_parse_one_dev_scope(scope, | |
154 | &(*devices)[index], segment); | |
155 | if (ret) { | |
ada4d4b2 | 156 | dmar_free_dev_scope(devices, cnt); |
10e5247f KA |
157 | return ret; |
158 | } | |
159 | index ++; | |
160 | } | |
161 | start += scope->length; | |
162 | } | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
ada4d4b2 JL |
167 | void dmar_free_dev_scope(struct pci_dev ***devices, int *cnt) |
168 | { | |
169 | if (*devices && *cnt) { | |
170 | while (--*cnt >= 0) | |
171 | pci_dev_put((*devices)[*cnt]); | |
172 | kfree(*devices); | |
173 | *devices = NULL; | |
174 | *cnt = 0; | |
175 | } | |
176 | } | |
177 | ||
10e5247f KA |
178 | /** |
179 | * dmar_parse_one_drhd - parses exactly one DMA remapping hardware definition | |
180 | * structure which uniquely represent one DMA remapping hardware unit | |
181 | * present in the platform | |
182 | */ | |
183 | static int __init | |
184 | dmar_parse_one_drhd(struct acpi_dmar_header *header) | |
185 | { | |
186 | struct acpi_dmar_hardware_unit *drhd; | |
187 | struct dmar_drhd_unit *dmaru; | |
188 | int ret = 0; | |
10e5247f | 189 | |
e523b38e | 190 | drhd = (struct acpi_dmar_hardware_unit *)header; |
10e5247f KA |
191 | dmaru = kzalloc(sizeof(*dmaru), GFP_KERNEL); |
192 | if (!dmaru) | |
193 | return -ENOMEM; | |
194 | ||
1886e8a9 | 195 | dmaru->hdr = header; |
10e5247f | 196 | dmaru->reg_base_addr = drhd->address; |
276dbf99 | 197 | dmaru->segment = drhd->segment; |
10e5247f KA |
198 | dmaru->include_all = drhd->flags & 0x1; /* BIT0: INCLUDE_ALL */ |
199 | ||
1886e8a9 SS |
200 | ret = alloc_iommu(dmaru); |
201 | if (ret) { | |
202 | kfree(dmaru); | |
203 | return ret; | |
204 | } | |
205 | dmar_register_drhd_unit(dmaru); | |
206 | return 0; | |
207 | } | |
208 | ||
a868e6b7 JL |
209 | static void dmar_free_drhd(struct dmar_drhd_unit *dmaru) |
210 | { | |
211 | if (dmaru->devices && dmaru->devices_cnt) | |
212 | dmar_free_dev_scope(&dmaru->devices, &dmaru->devices_cnt); | |
213 | if (dmaru->iommu) | |
214 | free_iommu(dmaru->iommu); | |
215 | kfree(dmaru); | |
216 | } | |
217 | ||
f82851a8 | 218 | static int __init dmar_parse_dev(struct dmar_drhd_unit *dmaru) |
1886e8a9 SS |
219 | { |
220 | struct acpi_dmar_hardware_unit *drhd; | |
1886e8a9 SS |
221 | |
222 | drhd = (struct acpi_dmar_hardware_unit *) dmaru->hdr; | |
223 | ||
2e824f79 YZ |
224 | if (dmaru->include_all) |
225 | return 0; | |
226 | ||
a868e6b7 JL |
227 | return dmar_parse_dev_scope((void *)(drhd + 1), |
228 | ((void *)drhd) + drhd->header.length, | |
229 | &dmaru->devices_cnt, &dmaru->devices, | |
230 | drhd->segment); | |
10e5247f KA |
231 | } |
232 | ||
aa697079 | 233 | #ifdef CONFIG_ACPI_NUMA |
ee34b32d SS |
234 | static int __init |
235 | dmar_parse_one_rhsa(struct acpi_dmar_header *header) | |
236 | { | |
237 | struct acpi_dmar_rhsa *rhsa; | |
238 | struct dmar_drhd_unit *drhd; | |
239 | ||
240 | rhsa = (struct acpi_dmar_rhsa *)header; | |
aa697079 | 241 | for_each_drhd_unit(drhd) { |
ee34b32d SS |
242 | if (drhd->reg_base_addr == rhsa->base_address) { |
243 | int node = acpi_map_pxm_to_node(rhsa->proximity_domain); | |
244 | ||
245 | if (!node_online(node)) | |
246 | node = -1; | |
247 | drhd->iommu->node = node; | |
aa697079 DW |
248 | return 0; |
249 | } | |
ee34b32d | 250 | } |
fd0c8894 BH |
251 | WARN_TAINT( |
252 | 1, TAINT_FIRMWARE_WORKAROUND, | |
253 | "Your BIOS is broken; RHSA refers to non-existent DMAR unit at %llx\n" | |
254 | "BIOS vendor: %s; Ver: %s; Product Version: %s\n", | |
255 | drhd->reg_base_addr, | |
256 | dmi_get_system_info(DMI_BIOS_VENDOR), | |
257 | dmi_get_system_info(DMI_BIOS_VERSION), | |
258 | dmi_get_system_info(DMI_PRODUCT_VERSION)); | |
ee34b32d | 259 | |
aa697079 | 260 | return 0; |
ee34b32d | 261 | } |
aa697079 | 262 | #endif |
ee34b32d | 263 | |
10e5247f KA |
264 | static void __init |
265 | dmar_table_print_dmar_entry(struct acpi_dmar_header *header) | |
266 | { | |
267 | struct acpi_dmar_hardware_unit *drhd; | |
268 | struct acpi_dmar_reserved_memory *rmrr; | |
aa5d2b51 | 269 | struct acpi_dmar_atsr *atsr; |
17b60977 | 270 | struct acpi_dmar_rhsa *rhsa; |
10e5247f KA |
271 | |
272 | switch (header->type) { | |
273 | case ACPI_DMAR_TYPE_HARDWARE_UNIT: | |
aa5d2b51 YZ |
274 | drhd = container_of(header, struct acpi_dmar_hardware_unit, |
275 | header); | |
e9071b0b | 276 | pr_info("DRHD base: %#016Lx flags: %#x\n", |
aa5d2b51 | 277 | (unsigned long long)drhd->address, drhd->flags); |
10e5247f KA |
278 | break; |
279 | case ACPI_DMAR_TYPE_RESERVED_MEMORY: | |
aa5d2b51 YZ |
280 | rmrr = container_of(header, struct acpi_dmar_reserved_memory, |
281 | header); | |
e9071b0b | 282 | pr_info("RMRR base: %#016Lx end: %#016Lx\n", |
5b6985ce FY |
283 | (unsigned long long)rmrr->base_address, |
284 | (unsigned long long)rmrr->end_address); | |
10e5247f | 285 | break; |
aa5d2b51 YZ |
286 | case ACPI_DMAR_TYPE_ATSR: |
287 | atsr = container_of(header, struct acpi_dmar_atsr, header); | |
e9071b0b | 288 | pr_info("ATSR flags: %#x\n", atsr->flags); |
aa5d2b51 | 289 | break; |
17b60977 RD |
290 | case ACPI_DMAR_HARDWARE_AFFINITY: |
291 | rhsa = container_of(header, struct acpi_dmar_rhsa, header); | |
e9071b0b | 292 | pr_info("RHSA base: %#016Lx proximity domain: %#x\n", |
17b60977 RD |
293 | (unsigned long long)rhsa->base_address, |
294 | rhsa->proximity_domain); | |
295 | break; | |
10e5247f KA |
296 | } |
297 | } | |
298 | ||
f6dd5c31 YL |
299 | /** |
300 | * dmar_table_detect - checks to see if the platform supports DMAR devices | |
301 | */ | |
302 | static int __init dmar_table_detect(void) | |
303 | { | |
304 | acpi_status status = AE_OK; | |
305 | ||
306 | /* if we could find DMAR table, then there are DMAR devices */ | |
8e1568f3 YL |
307 | status = acpi_get_table_with_size(ACPI_SIG_DMAR, 0, |
308 | (struct acpi_table_header **)&dmar_tbl, | |
309 | &dmar_tbl_size); | |
f6dd5c31 YL |
310 | |
311 | if (ACPI_SUCCESS(status) && !dmar_tbl) { | |
e9071b0b | 312 | pr_warn("Unable to map DMAR\n"); |
f6dd5c31 YL |
313 | status = AE_NOT_FOUND; |
314 | } | |
315 | ||
316 | return (ACPI_SUCCESS(status) ? 1 : 0); | |
317 | } | |
aaa9d1dd | 318 | |
10e5247f KA |
319 | /** |
320 | * parse_dmar_table - parses the DMA reporting table | |
321 | */ | |
322 | static int __init | |
323 | parse_dmar_table(void) | |
324 | { | |
325 | struct acpi_table_dmar *dmar; | |
326 | struct acpi_dmar_header *entry_header; | |
327 | int ret = 0; | |
7cef3347 | 328 | int drhd_count = 0; |
10e5247f | 329 | |
f6dd5c31 YL |
330 | /* |
331 | * Do it again, earlier dmar_tbl mapping could be mapped with | |
332 | * fixed map. | |
333 | */ | |
334 | dmar_table_detect(); | |
335 | ||
a59b50e9 JC |
336 | /* |
337 | * ACPI tables may not be DMA protected by tboot, so use DMAR copy | |
338 | * SINIT saved in SinitMleData in TXT heap (which is DMA protected) | |
339 | */ | |
340 | dmar_tbl = tboot_get_dmar_table(dmar_tbl); | |
341 | ||
10e5247f KA |
342 | dmar = (struct acpi_table_dmar *)dmar_tbl; |
343 | if (!dmar) | |
344 | return -ENODEV; | |
345 | ||
5b6985ce | 346 | if (dmar->width < PAGE_SHIFT - 1) { |
e9071b0b | 347 | pr_warn("Invalid DMAR haw\n"); |
10e5247f KA |
348 | return -EINVAL; |
349 | } | |
350 | ||
e9071b0b | 351 | pr_info("Host address width %d\n", dmar->width + 1); |
10e5247f KA |
352 | |
353 | entry_header = (struct acpi_dmar_header *)(dmar + 1); | |
354 | while (((unsigned long)entry_header) < | |
355 | (((unsigned long)dmar) + dmar_tbl->length)) { | |
084eb960 TB |
356 | /* Avoid looping forever on bad ACPI tables */ |
357 | if (entry_header->length == 0) { | |
e9071b0b | 358 | pr_warn("Invalid 0-length structure\n"); |
084eb960 TB |
359 | ret = -EINVAL; |
360 | break; | |
361 | } | |
362 | ||
10e5247f KA |
363 | dmar_table_print_dmar_entry(entry_header); |
364 | ||
365 | switch (entry_header->type) { | |
366 | case ACPI_DMAR_TYPE_HARDWARE_UNIT: | |
7cef3347 | 367 | drhd_count++; |
10e5247f KA |
368 | ret = dmar_parse_one_drhd(entry_header); |
369 | break; | |
370 | case ACPI_DMAR_TYPE_RESERVED_MEMORY: | |
371 | ret = dmar_parse_one_rmrr(entry_header); | |
aa5d2b51 YZ |
372 | break; |
373 | case ACPI_DMAR_TYPE_ATSR: | |
aa5d2b51 | 374 | ret = dmar_parse_one_atsr(entry_header); |
10e5247f | 375 | break; |
17b60977 | 376 | case ACPI_DMAR_HARDWARE_AFFINITY: |
aa697079 | 377 | #ifdef CONFIG_ACPI_NUMA |
ee34b32d | 378 | ret = dmar_parse_one_rhsa(entry_header); |
aa697079 | 379 | #endif |
17b60977 | 380 | break; |
10e5247f | 381 | default: |
e9071b0b | 382 | pr_warn("Unknown DMAR structure type %d\n", |
4de75cf9 | 383 | entry_header->type); |
10e5247f KA |
384 | ret = 0; /* for forward compatibility */ |
385 | break; | |
386 | } | |
387 | if (ret) | |
388 | break; | |
389 | ||
390 | entry_header = ((void *)entry_header + entry_header->length); | |
391 | } | |
7cef3347 LZH |
392 | if (drhd_count == 0) |
393 | pr_warn(FW_BUG "No DRHD structure found in DMAR table\n"); | |
10e5247f KA |
394 | return ret; |
395 | } | |
396 | ||
dda56549 | 397 | static int dmar_pci_device_match(struct pci_dev *devices[], int cnt, |
e61d98d8 SS |
398 | struct pci_dev *dev) |
399 | { | |
400 | int index; | |
401 | ||
402 | while (dev) { | |
403 | for (index = 0; index < cnt; index++) | |
404 | if (dev == devices[index]) | |
405 | return 1; | |
406 | ||
407 | /* Check our parent */ | |
408 | dev = dev->bus->self; | |
409 | } | |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
414 | struct dmar_drhd_unit * | |
415 | dmar_find_matched_drhd_unit(struct pci_dev *dev) | |
416 | { | |
2e824f79 YZ |
417 | struct dmar_drhd_unit *dmaru = NULL; |
418 | struct acpi_dmar_hardware_unit *drhd; | |
419 | ||
dda56549 Y |
420 | dev = pci_physfn(dev); |
421 | ||
8b161f0e | 422 | for_each_drhd_unit(dmaru) { |
2e824f79 YZ |
423 | drhd = container_of(dmaru->hdr, |
424 | struct acpi_dmar_hardware_unit, | |
425 | header); | |
426 | ||
427 | if (dmaru->include_all && | |
428 | drhd->segment == pci_domain_nr(dev->bus)) | |
429 | return dmaru; | |
e61d98d8 | 430 | |
2e824f79 YZ |
431 | if (dmar_pci_device_match(dmaru->devices, |
432 | dmaru->devices_cnt, dev)) | |
433 | return dmaru; | |
e61d98d8 SS |
434 | } |
435 | ||
436 | return NULL; | |
437 | } | |
438 | ||
1886e8a9 SS |
439 | int __init dmar_dev_scope_init(void) |
440 | { | |
c2c7286a | 441 | static int dmar_dev_scope_initialized; |
a868e6b7 | 442 | struct dmar_drhd_unit *drhd; |
1886e8a9 SS |
443 | int ret = -ENODEV; |
444 | ||
c2c7286a SS |
445 | if (dmar_dev_scope_initialized) |
446 | return dmar_dev_scope_initialized; | |
447 | ||
318fe7df SS |
448 | if (list_empty(&dmar_drhd_units)) |
449 | goto fail; | |
450 | ||
a868e6b7 | 451 | list_for_each_entry(drhd, &dmar_drhd_units, list) { |
1886e8a9 SS |
452 | ret = dmar_parse_dev(drhd); |
453 | if (ret) | |
c2c7286a | 454 | goto fail; |
1886e8a9 SS |
455 | } |
456 | ||
318fe7df SS |
457 | ret = dmar_parse_rmrr_atsr_dev(); |
458 | if (ret) | |
459 | goto fail; | |
1886e8a9 | 460 | |
c2c7286a SS |
461 | dmar_dev_scope_initialized = 1; |
462 | return 0; | |
463 | ||
464 | fail: | |
465 | dmar_dev_scope_initialized = ret; | |
1886e8a9 SS |
466 | return ret; |
467 | } | |
468 | ||
10e5247f KA |
469 | |
470 | int __init dmar_table_init(void) | |
471 | { | |
1886e8a9 | 472 | static int dmar_table_initialized; |
093f87d2 FY |
473 | int ret; |
474 | ||
1886e8a9 SS |
475 | if (dmar_table_initialized) |
476 | return 0; | |
477 | ||
478 | dmar_table_initialized = 1; | |
479 | ||
093f87d2 FY |
480 | ret = parse_dmar_table(); |
481 | if (ret) { | |
1886e8a9 | 482 | if (ret != -ENODEV) |
e9071b0b | 483 | pr_info("parse DMAR table failure.\n"); |
093f87d2 FY |
484 | return ret; |
485 | } | |
486 | ||
10e5247f | 487 | if (list_empty(&dmar_drhd_units)) { |
e9071b0b | 488 | pr_info("No DMAR devices found\n"); |
10e5247f KA |
489 | return -ENODEV; |
490 | } | |
093f87d2 | 491 | |
10e5247f KA |
492 | return 0; |
493 | } | |
494 | ||
3a8663ee BH |
495 | static void warn_invalid_dmar(u64 addr, const char *message) |
496 | { | |
fd0c8894 BH |
497 | WARN_TAINT_ONCE( |
498 | 1, TAINT_FIRMWARE_WORKAROUND, | |
499 | "Your BIOS is broken; DMAR reported at address %llx%s!\n" | |
500 | "BIOS vendor: %s; Ver: %s; Product Version: %s\n", | |
501 | addr, message, | |
502 | dmi_get_system_info(DMI_BIOS_VENDOR), | |
503 | dmi_get_system_info(DMI_BIOS_VERSION), | |
504 | dmi_get_system_info(DMI_PRODUCT_VERSION)); | |
3a8663ee | 505 | } |
6ecbf01c | 506 | |
21004dcd | 507 | static int __init check_zero_address(void) |
86cf898e DW |
508 | { |
509 | struct acpi_table_dmar *dmar; | |
510 | struct acpi_dmar_header *entry_header; | |
511 | struct acpi_dmar_hardware_unit *drhd; | |
512 | ||
513 | dmar = (struct acpi_table_dmar *)dmar_tbl; | |
514 | entry_header = (struct acpi_dmar_header *)(dmar + 1); | |
515 | ||
516 | while (((unsigned long)entry_header) < | |
517 | (((unsigned long)dmar) + dmar_tbl->length)) { | |
518 | /* Avoid looping forever on bad ACPI tables */ | |
519 | if (entry_header->length == 0) { | |
e9071b0b | 520 | pr_warn("Invalid 0-length structure\n"); |
86cf898e DW |
521 | return 0; |
522 | } | |
523 | ||
524 | if (entry_header->type == ACPI_DMAR_TYPE_HARDWARE_UNIT) { | |
2c992208 CW |
525 | void __iomem *addr; |
526 | u64 cap, ecap; | |
527 | ||
86cf898e DW |
528 | drhd = (void *)entry_header; |
529 | if (!drhd->address) { | |
3a8663ee | 530 | warn_invalid_dmar(0, ""); |
2c992208 CW |
531 | goto failed; |
532 | } | |
533 | ||
534 | addr = early_ioremap(drhd->address, VTD_PAGE_SIZE); | |
535 | if (!addr ) { | |
536 | printk("IOMMU: can't validate: %llx\n", drhd->address); | |
537 | goto failed; | |
538 | } | |
539 | cap = dmar_readq(addr + DMAR_CAP_REG); | |
540 | ecap = dmar_readq(addr + DMAR_ECAP_REG); | |
541 | early_iounmap(addr, VTD_PAGE_SIZE); | |
542 | if (cap == (uint64_t)-1 && ecap == (uint64_t)-1) { | |
3a8663ee BH |
543 | warn_invalid_dmar(drhd->address, |
544 | " returns all ones"); | |
2c992208 | 545 | goto failed; |
86cf898e | 546 | } |
86cf898e DW |
547 | } |
548 | ||
549 | entry_header = ((void *)entry_header + entry_header->length); | |
550 | } | |
551 | return 1; | |
2c992208 CW |
552 | |
553 | failed: | |
2c992208 | 554 | return 0; |
86cf898e DW |
555 | } |
556 | ||
480125ba | 557 | int __init detect_intel_iommu(void) |
2ae21010 SS |
558 | { |
559 | int ret; | |
560 | ||
f6dd5c31 | 561 | ret = dmar_table_detect(); |
86cf898e DW |
562 | if (ret) |
563 | ret = check_zero_address(); | |
2ae21010 | 564 | { |
11bd04f6 | 565 | if (ret && !no_iommu && !iommu_detected && !dmar_disabled) { |
2ae21010 | 566 | iommu_detected = 1; |
5d990b62 CW |
567 | /* Make sure ACS will be enabled */ |
568 | pci_request_acs(); | |
569 | } | |
f5d1b97b | 570 | |
9d5ce73a FT |
571 | #ifdef CONFIG_X86 |
572 | if (ret) | |
573 | x86_init.iommu.iommu_init = intel_iommu_init; | |
2ae21010 | 574 | #endif |
cacd4213 | 575 | } |
8e1568f3 | 576 | early_acpi_os_unmap_memory(dmar_tbl, dmar_tbl_size); |
f6dd5c31 | 577 | dmar_tbl = NULL; |
480125ba | 578 | |
4db77ff3 | 579 | return ret ? 1 : -ENODEV; |
2ae21010 SS |
580 | } |
581 | ||
582 | ||
6f5cf521 DD |
583 | static void unmap_iommu(struct intel_iommu *iommu) |
584 | { | |
585 | iounmap(iommu->reg); | |
586 | release_mem_region(iommu->reg_phys, iommu->reg_size); | |
587 | } | |
588 | ||
589 | /** | |
590 | * map_iommu: map the iommu's registers | |
591 | * @iommu: the iommu to map | |
592 | * @phys_addr: the physical address of the base resgister | |
e9071b0b | 593 | * |
6f5cf521 | 594 | * Memory map the iommu's registers. Start w/ a single page, and |
e9071b0b | 595 | * possibly expand if that turns out to be insufficent. |
6f5cf521 DD |
596 | */ |
597 | static int map_iommu(struct intel_iommu *iommu, u64 phys_addr) | |
598 | { | |
599 | int map_size, err=0; | |
600 | ||
601 | iommu->reg_phys = phys_addr; | |
602 | iommu->reg_size = VTD_PAGE_SIZE; | |
603 | ||
604 | if (!request_mem_region(iommu->reg_phys, iommu->reg_size, iommu->name)) { | |
605 | pr_err("IOMMU: can't reserve memory\n"); | |
606 | err = -EBUSY; | |
607 | goto out; | |
608 | } | |
609 | ||
610 | iommu->reg = ioremap(iommu->reg_phys, iommu->reg_size); | |
611 | if (!iommu->reg) { | |
612 | pr_err("IOMMU: can't map the region\n"); | |
613 | err = -ENOMEM; | |
614 | goto release; | |
615 | } | |
616 | ||
617 | iommu->cap = dmar_readq(iommu->reg + DMAR_CAP_REG); | |
618 | iommu->ecap = dmar_readq(iommu->reg + DMAR_ECAP_REG); | |
619 | ||
620 | if (iommu->cap == (uint64_t)-1 && iommu->ecap == (uint64_t)-1) { | |
621 | err = -EINVAL; | |
622 | warn_invalid_dmar(phys_addr, " returns all ones"); | |
623 | goto unmap; | |
624 | } | |
625 | ||
626 | /* the registers might be more than one page */ | |
627 | map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap), | |
628 | cap_max_fault_reg_offset(iommu->cap)); | |
629 | map_size = VTD_PAGE_ALIGN(map_size); | |
630 | if (map_size > iommu->reg_size) { | |
631 | iounmap(iommu->reg); | |
632 | release_mem_region(iommu->reg_phys, iommu->reg_size); | |
633 | iommu->reg_size = map_size; | |
634 | if (!request_mem_region(iommu->reg_phys, iommu->reg_size, | |
635 | iommu->name)) { | |
636 | pr_err("IOMMU: can't reserve memory\n"); | |
637 | err = -EBUSY; | |
638 | goto out; | |
639 | } | |
640 | iommu->reg = ioremap(iommu->reg_phys, iommu->reg_size); | |
641 | if (!iommu->reg) { | |
642 | pr_err("IOMMU: can't map the region\n"); | |
643 | err = -ENOMEM; | |
644 | goto release; | |
645 | } | |
646 | } | |
647 | err = 0; | |
648 | goto out; | |
649 | ||
650 | unmap: | |
651 | iounmap(iommu->reg); | |
652 | release: | |
653 | release_mem_region(iommu->reg_phys, iommu->reg_size); | |
654 | out: | |
655 | return err; | |
656 | } | |
657 | ||
694835dc | 658 | static int alloc_iommu(struct dmar_drhd_unit *drhd) |
e61d98d8 | 659 | { |
c42d9f32 | 660 | struct intel_iommu *iommu; |
3a93c841 | 661 | u32 ver, sts; |
c42d9f32 | 662 | static int iommu_allocated = 0; |
43f7392b | 663 | int agaw = 0; |
4ed0d3e6 | 664 | int msagaw = 0; |
6f5cf521 | 665 | int err; |
c42d9f32 | 666 | |
6ecbf01c | 667 | if (!drhd->reg_base_addr) { |
3a8663ee | 668 | warn_invalid_dmar(0, ""); |
6ecbf01c DW |
669 | return -EINVAL; |
670 | } | |
671 | ||
c42d9f32 SS |
672 | iommu = kzalloc(sizeof(*iommu), GFP_KERNEL); |
673 | if (!iommu) | |
1886e8a9 | 674 | return -ENOMEM; |
c42d9f32 SS |
675 | |
676 | iommu->seq_id = iommu_allocated++; | |
9d783ba0 | 677 | sprintf (iommu->name, "dmar%d", iommu->seq_id); |
e61d98d8 | 678 | |
6f5cf521 DD |
679 | err = map_iommu(iommu, drhd->reg_base_addr); |
680 | if (err) { | |
681 | pr_err("IOMMU: failed to map %s\n", iommu->name); | |
e61d98d8 SS |
682 | goto error; |
683 | } | |
0815565a | 684 | |
6f5cf521 | 685 | err = -EINVAL; |
1b573683 WH |
686 | agaw = iommu_calculate_agaw(iommu); |
687 | if (agaw < 0) { | |
bf947fcb DD |
688 | pr_err("Cannot get a valid agaw for iommu (seq_id = %d)\n", |
689 | iommu->seq_id); | |
0815565a | 690 | goto err_unmap; |
4ed0d3e6 FY |
691 | } |
692 | msagaw = iommu_calculate_max_sagaw(iommu); | |
693 | if (msagaw < 0) { | |
bf947fcb | 694 | pr_err("Cannot get a valid max agaw for iommu (seq_id = %d)\n", |
1b573683 | 695 | iommu->seq_id); |
0815565a | 696 | goto err_unmap; |
1b573683 WH |
697 | } |
698 | iommu->agaw = agaw; | |
4ed0d3e6 | 699 | iommu->msagaw = msagaw; |
1b573683 | 700 | |
ee34b32d SS |
701 | iommu->node = -1; |
702 | ||
e61d98d8 | 703 | ver = readl(iommu->reg + DMAR_VER_REG); |
680a7524 YL |
704 | pr_info("IOMMU %d: reg_base_addr %llx ver %d:%d cap %llx ecap %llx\n", |
705 | iommu->seq_id, | |
5b6985ce FY |
706 | (unsigned long long)drhd->reg_base_addr, |
707 | DMAR_VER_MAJOR(ver), DMAR_VER_MINOR(ver), | |
708 | (unsigned long long)iommu->cap, | |
709 | (unsigned long long)iommu->ecap); | |
e61d98d8 | 710 | |
3a93c841 TI |
711 | /* Reflect status in gcmd */ |
712 | sts = readl(iommu->reg + DMAR_GSTS_REG); | |
713 | if (sts & DMA_GSTS_IRES) | |
714 | iommu->gcmd |= DMA_GCMD_IRE; | |
715 | if (sts & DMA_GSTS_TES) | |
716 | iommu->gcmd |= DMA_GCMD_TE; | |
717 | if (sts & DMA_GSTS_QIES) | |
718 | iommu->gcmd |= DMA_GCMD_QIE; | |
719 | ||
1f5b3c3f | 720 | raw_spin_lock_init(&iommu->register_lock); |
e61d98d8 SS |
721 | |
722 | drhd->iommu = iommu; | |
1886e8a9 | 723 | return 0; |
0815565a DW |
724 | |
725 | err_unmap: | |
6f5cf521 | 726 | unmap_iommu(iommu); |
0815565a | 727 | error: |
e61d98d8 | 728 | kfree(iommu); |
6f5cf521 | 729 | return err; |
e61d98d8 SS |
730 | } |
731 | ||
a868e6b7 | 732 | static void free_iommu(struct intel_iommu *iommu) |
e61d98d8 | 733 | { |
a868e6b7 JL |
734 | if (iommu->irq) { |
735 | free_irq(iommu->irq, iommu); | |
736 | irq_set_handler_data(iommu->irq, NULL); | |
737 | destroy_irq(iommu->irq); | |
738 | } | |
e61d98d8 SS |
739 | |
740 | if (iommu->reg) | |
6f5cf521 DD |
741 | unmap_iommu(iommu); |
742 | ||
e61d98d8 SS |
743 | kfree(iommu); |
744 | } | |
fe962e90 SS |
745 | |
746 | /* | |
747 | * Reclaim all the submitted descriptors which have completed its work. | |
748 | */ | |
749 | static inline void reclaim_free_desc(struct q_inval *qi) | |
750 | { | |
6ba6c3a4 YZ |
751 | while (qi->desc_status[qi->free_tail] == QI_DONE || |
752 | qi->desc_status[qi->free_tail] == QI_ABORT) { | |
fe962e90 SS |
753 | qi->desc_status[qi->free_tail] = QI_FREE; |
754 | qi->free_tail = (qi->free_tail + 1) % QI_LENGTH; | |
755 | qi->free_cnt++; | |
756 | } | |
757 | } | |
758 | ||
704126ad YZ |
759 | static int qi_check_fault(struct intel_iommu *iommu, int index) |
760 | { | |
761 | u32 fault; | |
6ba6c3a4 | 762 | int head, tail; |
704126ad YZ |
763 | struct q_inval *qi = iommu->qi; |
764 | int wait_index = (index + 1) % QI_LENGTH; | |
765 | ||
6ba6c3a4 YZ |
766 | if (qi->desc_status[wait_index] == QI_ABORT) |
767 | return -EAGAIN; | |
768 | ||
704126ad YZ |
769 | fault = readl(iommu->reg + DMAR_FSTS_REG); |
770 | ||
771 | /* | |
772 | * If IQE happens, the head points to the descriptor associated | |
773 | * with the error. No new descriptors are fetched until the IQE | |
774 | * is cleared. | |
775 | */ | |
776 | if (fault & DMA_FSTS_IQE) { | |
777 | head = readl(iommu->reg + DMAR_IQH_REG); | |
6ba6c3a4 | 778 | if ((head >> DMAR_IQ_SHIFT) == index) { |
bf947fcb | 779 | pr_err("VT-d detected invalid descriptor: " |
6ba6c3a4 YZ |
780 | "low=%llx, high=%llx\n", |
781 | (unsigned long long)qi->desc[index].low, | |
782 | (unsigned long long)qi->desc[index].high); | |
704126ad YZ |
783 | memcpy(&qi->desc[index], &qi->desc[wait_index], |
784 | sizeof(struct qi_desc)); | |
785 | __iommu_flush_cache(iommu, &qi->desc[index], | |
786 | sizeof(struct qi_desc)); | |
787 | writel(DMA_FSTS_IQE, iommu->reg + DMAR_FSTS_REG); | |
788 | return -EINVAL; | |
789 | } | |
790 | } | |
791 | ||
6ba6c3a4 YZ |
792 | /* |
793 | * If ITE happens, all pending wait_desc commands are aborted. | |
794 | * No new descriptors are fetched until the ITE is cleared. | |
795 | */ | |
796 | if (fault & DMA_FSTS_ITE) { | |
797 | head = readl(iommu->reg + DMAR_IQH_REG); | |
798 | head = ((head >> DMAR_IQ_SHIFT) - 1 + QI_LENGTH) % QI_LENGTH; | |
799 | head |= 1; | |
800 | tail = readl(iommu->reg + DMAR_IQT_REG); | |
801 | tail = ((tail >> DMAR_IQ_SHIFT) - 1 + QI_LENGTH) % QI_LENGTH; | |
802 | ||
803 | writel(DMA_FSTS_ITE, iommu->reg + DMAR_FSTS_REG); | |
804 | ||
805 | do { | |
806 | if (qi->desc_status[head] == QI_IN_USE) | |
807 | qi->desc_status[head] = QI_ABORT; | |
808 | head = (head - 2 + QI_LENGTH) % QI_LENGTH; | |
809 | } while (head != tail); | |
810 | ||
811 | if (qi->desc_status[wait_index] == QI_ABORT) | |
812 | return -EAGAIN; | |
813 | } | |
814 | ||
815 | if (fault & DMA_FSTS_ICE) | |
816 | writel(DMA_FSTS_ICE, iommu->reg + DMAR_FSTS_REG); | |
817 | ||
704126ad YZ |
818 | return 0; |
819 | } | |
820 | ||
fe962e90 SS |
821 | /* |
822 | * Submit the queued invalidation descriptor to the remapping | |
823 | * hardware unit and wait for its completion. | |
824 | */ | |
704126ad | 825 | int qi_submit_sync(struct qi_desc *desc, struct intel_iommu *iommu) |
fe962e90 | 826 | { |
6ba6c3a4 | 827 | int rc; |
fe962e90 SS |
828 | struct q_inval *qi = iommu->qi; |
829 | struct qi_desc *hw, wait_desc; | |
830 | int wait_index, index; | |
831 | unsigned long flags; | |
832 | ||
833 | if (!qi) | |
704126ad | 834 | return 0; |
fe962e90 SS |
835 | |
836 | hw = qi->desc; | |
837 | ||
6ba6c3a4 YZ |
838 | restart: |
839 | rc = 0; | |
840 | ||
3b8f4048 | 841 | raw_spin_lock_irqsave(&qi->q_lock, flags); |
fe962e90 | 842 | while (qi->free_cnt < 3) { |
3b8f4048 | 843 | raw_spin_unlock_irqrestore(&qi->q_lock, flags); |
fe962e90 | 844 | cpu_relax(); |
3b8f4048 | 845 | raw_spin_lock_irqsave(&qi->q_lock, flags); |
fe962e90 SS |
846 | } |
847 | ||
848 | index = qi->free_head; | |
849 | wait_index = (index + 1) % QI_LENGTH; | |
850 | ||
851 | qi->desc_status[index] = qi->desc_status[wait_index] = QI_IN_USE; | |
852 | ||
853 | hw[index] = *desc; | |
854 | ||
704126ad YZ |
855 | wait_desc.low = QI_IWD_STATUS_DATA(QI_DONE) | |
856 | QI_IWD_STATUS_WRITE | QI_IWD_TYPE; | |
fe962e90 SS |
857 | wait_desc.high = virt_to_phys(&qi->desc_status[wait_index]); |
858 | ||
859 | hw[wait_index] = wait_desc; | |
860 | ||
861 | __iommu_flush_cache(iommu, &hw[index], sizeof(struct qi_desc)); | |
862 | __iommu_flush_cache(iommu, &hw[wait_index], sizeof(struct qi_desc)); | |
863 | ||
864 | qi->free_head = (qi->free_head + 2) % QI_LENGTH; | |
865 | qi->free_cnt -= 2; | |
866 | ||
fe962e90 SS |
867 | /* |
868 | * update the HW tail register indicating the presence of | |
869 | * new descriptors. | |
870 | */ | |
6ba6c3a4 | 871 | writel(qi->free_head << DMAR_IQ_SHIFT, iommu->reg + DMAR_IQT_REG); |
fe962e90 SS |
872 | |
873 | while (qi->desc_status[wait_index] != QI_DONE) { | |
f05810c9 SS |
874 | /* |
875 | * We will leave the interrupts disabled, to prevent interrupt | |
876 | * context to queue another cmd while a cmd is already submitted | |
877 | * and waiting for completion on this cpu. This is to avoid | |
878 | * a deadlock where the interrupt context can wait indefinitely | |
879 | * for free slots in the queue. | |
880 | */ | |
704126ad YZ |
881 | rc = qi_check_fault(iommu, index); |
882 | if (rc) | |
6ba6c3a4 | 883 | break; |
704126ad | 884 | |
3b8f4048 | 885 | raw_spin_unlock(&qi->q_lock); |
fe962e90 | 886 | cpu_relax(); |
3b8f4048 | 887 | raw_spin_lock(&qi->q_lock); |
fe962e90 | 888 | } |
6ba6c3a4 YZ |
889 | |
890 | qi->desc_status[index] = QI_DONE; | |
fe962e90 SS |
891 | |
892 | reclaim_free_desc(qi); | |
3b8f4048 | 893 | raw_spin_unlock_irqrestore(&qi->q_lock, flags); |
704126ad | 894 | |
6ba6c3a4 YZ |
895 | if (rc == -EAGAIN) |
896 | goto restart; | |
897 | ||
704126ad | 898 | return rc; |
fe962e90 SS |
899 | } |
900 | ||
901 | /* | |
902 | * Flush the global interrupt entry cache. | |
903 | */ | |
904 | void qi_global_iec(struct intel_iommu *iommu) | |
905 | { | |
906 | struct qi_desc desc; | |
907 | ||
908 | desc.low = QI_IEC_TYPE; | |
909 | desc.high = 0; | |
910 | ||
704126ad | 911 | /* should never fail */ |
fe962e90 SS |
912 | qi_submit_sync(&desc, iommu); |
913 | } | |
914 | ||
4c25a2c1 DW |
915 | void qi_flush_context(struct intel_iommu *iommu, u16 did, u16 sid, u8 fm, |
916 | u64 type) | |
3481f210 | 917 | { |
3481f210 YS |
918 | struct qi_desc desc; |
919 | ||
3481f210 YS |
920 | desc.low = QI_CC_FM(fm) | QI_CC_SID(sid) | QI_CC_DID(did) |
921 | | QI_CC_GRAN(type) | QI_CC_TYPE; | |
922 | desc.high = 0; | |
923 | ||
4c25a2c1 | 924 | qi_submit_sync(&desc, iommu); |
3481f210 YS |
925 | } |
926 | ||
1f0ef2aa DW |
927 | void qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr, |
928 | unsigned int size_order, u64 type) | |
3481f210 YS |
929 | { |
930 | u8 dw = 0, dr = 0; | |
931 | ||
932 | struct qi_desc desc; | |
933 | int ih = 0; | |
934 | ||
3481f210 YS |
935 | if (cap_write_drain(iommu->cap)) |
936 | dw = 1; | |
937 | ||
938 | if (cap_read_drain(iommu->cap)) | |
939 | dr = 1; | |
940 | ||
941 | desc.low = QI_IOTLB_DID(did) | QI_IOTLB_DR(dr) | QI_IOTLB_DW(dw) | |
942 | | QI_IOTLB_GRAN(type) | QI_IOTLB_TYPE; | |
943 | desc.high = QI_IOTLB_ADDR(addr) | QI_IOTLB_IH(ih) | |
944 | | QI_IOTLB_AM(size_order); | |
945 | ||
1f0ef2aa | 946 | qi_submit_sync(&desc, iommu); |
3481f210 YS |
947 | } |
948 | ||
6ba6c3a4 YZ |
949 | void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 qdep, |
950 | u64 addr, unsigned mask) | |
951 | { | |
952 | struct qi_desc desc; | |
953 | ||
954 | if (mask) { | |
955 | BUG_ON(addr & ((1 << (VTD_PAGE_SHIFT + mask)) - 1)); | |
956 | addr |= (1 << (VTD_PAGE_SHIFT + mask - 1)) - 1; | |
957 | desc.high = QI_DEV_IOTLB_ADDR(addr) | QI_DEV_IOTLB_SIZE; | |
958 | } else | |
959 | desc.high = QI_DEV_IOTLB_ADDR(addr); | |
960 | ||
961 | if (qdep >= QI_DEV_IOTLB_MAX_INVS) | |
962 | qdep = 0; | |
963 | ||
964 | desc.low = QI_DEV_IOTLB_SID(sid) | QI_DEV_IOTLB_QDEP(qdep) | | |
965 | QI_DIOTLB_TYPE; | |
966 | ||
967 | qi_submit_sync(&desc, iommu); | |
968 | } | |
969 | ||
eba67e5d SS |
970 | /* |
971 | * Disable Queued Invalidation interface. | |
972 | */ | |
973 | void dmar_disable_qi(struct intel_iommu *iommu) | |
974 | { | |
975 | unsigned long flags; | |
976 | u32 sts; | |
977 | cycles_t start_time = get_cycles(); | |
978 | ||
979 | if (!ecap_qis(iommu->ecap)) | |
980 | return; | |
981 | ||
1f5b3c3f | 982 | raw_spin_lock_irqsave(&iommu->register_lock, flags); |
eba67e5d SS |
983 | |
984 | sts = dmar_readq(iommu->reg + DMAR_GSTS_REG); | |
985 | if (!(sts & DMA_GSTS_QIES)) | |
986 | goto end; | |
987 | ||
988 | /* | |
989 | * Give a chance to HW to complete the pending invalidation requests. | |
990 | */ | |
991 | while ((readl(iommu->reg + DMAR_IQT_REG) != | |
992 | readl(iommu->reg + DMAR_IQH_REG)) && | |
993 | (DMAR_OPERATION_TIMEOUT > (get_cycles() - start_time))) | |
994 | cpu_relax(); | |
995 | ||
996 | iommu->gcmd &= ~DMA_GCMD_QIE; | |
eba67e5d SS |
997 | writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); |
998 | ||
999 | IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, | |
1000 | !(sts & DMA_GSTS_QIES), sts); | |
1001 | end: | |
1f5b3c3f | 1002 | raw_spin_unlock_irqrestore(&iommu->register_lock, flags); |
eba67e5d SS |
1003 | } |
1004 | ||
eb4a52bc FY |
1005 | /* |
1006 | * Enable queued invalidation. | |
1007 | */ | |
1008 | static void __dmar_enable_qi(struct intel_iommu *iommu) | |
1009 | { | |
c416daa9 | 1010 | u32 sts; |
eb4a52bc FY |
1011 | unsigned long flags; |
1012 | struct q_inval *qi = iommu->qi; | |
1013 | ||
1014 | qi->free_head = qi->free_tail = 0; | |
1015 | qi->free_cnt = QI_LENGTH; | |
1016 | ||
1f5b3c3f | 1017 | raw_spin_lock_irqsave(&iommu->register_lock, flags); |
eb4a52bc FY |
1018 | |
1019 | /* write zero to the tail reg */ | |
1020 | writel(0, iommu->reg + DMAR_IQT_REG); | |
1021 | ||
1022 | dmar_writeq(iommu->reg + DMAR_IQA_REG, virt_to_phys(qi->desc)); | |
1023 | ||
eb4a52bc | 1024 | iommu->gcmd |= DMA_GCMD_QIE; |
c416daa9 | 1025 | writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); |
eb4a52bc FY |
1026 | |
1027 | /* Make sure hardware complete it */ | |
1028 | IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, (sts & DMA_GSTS_QIES), sts); | |
1029 | ||
1f5b3c3f | 1030 | raw_spin_unlock_irqrestore(&iommu->register_lock, flags); |
eb4a52bc FY |
1031 | } |
1032 | ||
fe962e90 SS |
1033 | /* |
1034 | * Enable Queued Invalidation interface. This is a must to support | |
1035 | * interrupt-remapping. Also used by DMA-remapping, which replaces | |
1036 | * register based IOTLB invalidation. | |
1037 | */ | |
1038 | int dmar_enable_qi(struct intel_iommu *iommu) | |
1039 | { | |
fe962e90 | 1040 | struct q_inval *qi; |
751cafe3 | 1041 | struct page *desc_page; |
fe962e90 SS |
1042 | |
1043 | if (!ecap_qis(iommu->ecap)) | |
1044 | return -ENOENT; | |
1045 | ||
1046 | /* | |
1047 | * queued invalidation is already setup and enabled. | |
1048 | */ | |
1049 | if (iommu->qi) | |
1050 | return 0; | |
1051 | ||
fa4b57cc | 1052 | iommu->qi = kmalloc(sizeof(*qi), GFP_ATOMIC); |
fe962e90 SS |
1053 | if (!iommu->qi) |
1054 | return -ENOMEM; | |
1055 | ||
1056 | qi = iommu->qi; | |
1057 | ||
751cafe3 SS |
1058 | |
1059 | desc_page = alloc_pages_node(iommu->node, GFP_ATOMIC | __GFP_ZERO, 0); | |
1060 | if (!desc_page) { | |
fe962e90 SS |
1061 | kfree(qi); |
1062 | iommu->qi = 0; | |
1063 | return -ENOMEM; | |
1064 | } | |
1065 | ||
751cafe3 SS |
1066 | qi->desc = page_address(desc_page); |
1067 | ||
37a40710 | 1068 | qi->desc_status = kzalloc(QI_LENGTH * sizeof(int), GFP_ATOMIC); |
fe962e90 SS |
1069 | if (!qi->desc_status) { |
1070 | free_page((unsigned long) qi->desc); | |
1071 | kfree(qi); | |
1072 | iommu->qi = 0; | |
1073 | return -ENOMEM; | |
1074 | } | |
1075 | ||
1076 | qi->free_head = qi->free_tail = 0; | |
1077 | qi->free_cnt = QI_LENGTH; | |
1078 | ||
3b8f4048 | 1079 | raw_spin_lock_init(&qi->q_lock); |
fe962e90 | 1080 | |
eb4a52bc | 1081 | __dmar_enable_qi(iommu); |
fe962e90 SS |
1082 | |
1083 | return 0; | |
1084 | } | |
0ac2491f SS |
1085 | |
1086 | /* iommu interrupt handling. Most stuff are MSI-like. */ | |
1087 | ||
9d783ba0 SS |
1088 | enum faulttype { |
1089 | DMA_REMAP, | |
1090 | INTR_REMAP, | |
1091 | UNKNOWN, | |
1092 | }; | |
1093 | ||
1094 | static const char *dma_remap_fault_reasons[] = | |
0ac2491f SS |
1095 | { |
1096 | "Software", | |
1097 | "Present bit in root entry is clear", | |
1098 | "Present bit in context entry is clear", | |
1099 | "Invalid context entry", | |
1100 | "Access beyond MGAW", | |
1101 | "PTE Write access is not set", | |
1102 | "PTE Read access is not set", | |
1103 | "Next page table ptr is invalid", | |
1104 | "Root table address invalid", | |
1105 | "Context table ptr is invalid", | |
1106 | "non-zero reserved fields in RTP", | |
1107 | "non-zero reserved fields in CTP", | |
1108 | "non-zero reserved fields in PTE", | |
4ecccd9e | 1109 | "PCE for translation request specifies blocking", |
0ac2491f | 1110 | }; |
9d783ba0 | 1111 | |
95a02e97 | 1112 | static const char *irq_remap_fault_reasons[] = |
9d783ba0 SS |
1113 | { |
1114 | "Detected reserved fields in the decoded interrupt-remapped request", | |
1115 | "Interrupt index exceeded the interrupt-remapping table size", | |
1116 | "Present field in the IRTE entry is clear", | |
1117 | "Error accessing interrupt-remapping table pointed by IRTA_REG", | |
1118 | "Detected reserved fields in the IRTE entry", | |
1119 | "Blocked a compatibility format interrupt request", | |
1120 | "Blocked an interrupt request due to source-id verification failure", | |
1121 | }; | |
1122 | ||
21004dcd | 1123 | static const char *dmar_get_fault_reason(u8 fault_reason, int *fault_type) |
0ac2491f | 1124 | { |
fefe1ed1 DC |
1125 | if (fault_reason >= 0x20 && (fault_reason - 0x20 < |
1126 | ARRAY_SIZE(irq_remap_fault_reasons))) { | |
9d783ba0 | 1127 | *fault_type = INTR_REMAP; |
95a02e97 | 1128 | return irq_remap_fault_reasons[fault_reason - 0x20]; |
9d783ba0 SS |
1129 | } else if (fault_reason < ARRAY_SIZE(dma_remap_fault_reasons)) { |
1130 | *fault_type = DMA_REMAP; | |
1131 | return dma_remap_fault_reasons[fault_reason]; | |
1132 | } else { | |
1133 | *fault_type = UNKNOWN; | |
0ac2491f | 1134 | return "Unknown"; |
9d783ba0 | 1135 | } |
0ac2491f SS |
1136 | } |
1137 | ||
5c2837fb | 1138 | void dmar_msi_unmask(struct irq_data *data) |
0ac2491f | 1139 | { |
dced35ae | 1140 | struct intel_iommu *iommu = irq_data_get_irq_handler_data(data); |
0ac2491f SS |
1141 | unsigned long flag; |
1142 | ||
1143 | /* unmask it */ | |
1f5b3c3f | 1144 | raw_spin_lock_irqsave(&iommu->register_lock, flag); |
0ac2491f SS |
1145 | writel(0, iommu->reg + DMAR_FECTL_REG); |
1146 | /* Read a reg to force flush the post write */ | |
1147 | readl(iommu->reg + DMAR_FECTL_REG); | |
1f5b3c3f | 1148 | raw_spin_unlock_irqrestore(&iommu->register_lock, flag); |
0ac2491f SS |
1149 | } |
1150 | ||
5c2837fb | 1151 | void dmar_msi_mask(struct irq_data *data) |
0ac2491f SS |
1152 | { |
1153 | unsigned long flag; | |
dced35ae | 1154 | struct intel_iommu *iommu = irq_data_get_irq_handler_data(data); |
0ac2491f SS |
1155 | |
1156 | /* mask it */ | |
1f5b3c3f | 1157 | raw_spin_lock_irqsave(&iommu->register_lock, flag); |
0ac2491f SS |
1158 | writel(DMA_FECTL_IM, iommu->reg + DMAR_FECTL_REG); |
1159 | /* Read a reg to force flush the post write */ | |
1160 | readl(iommu->reg + DMAR_FECTL_REG); | |
1f5b3c3f | 1161 | raw_spin_unlock_irqrestore(&iommu->register_lock, flag); |
0ac2491f SS |
1162 | } |
1163 | ||
1164 | void dmar_msi_write(int irq, struct msi_msg *msg) | |
1165 | { | |
dced35ae | 1166 | struct intel_iommu *iommu = irq_get_handler_data(irq); |
0ac2491f SS |
1167 | unsigned long flag; |
1168 | ||
1f5b3c3f | 1169 | raw_spin_lock_irqsave(&iommu->register_lock, flag); |
0ac2491f SS |
1170 | writel(msg->data, iommu->reg + DMAR_FEDATA_REG); |
1171 | writel(msg->address_lo, iommu->reg + DMAR_FEADDR_REG); | |
1172 | writel(msg->address_hi, iommu->reg + DMAR_FEUADDR_REG); | |
1f5b3c3f | 1173 | raw_spin_unlock_irqrestore(&iommu->register_lock, flag); |
0ac2491f SS |
1174 | } |
1175 | ||
1176 | void dmar_msi_read(int irq, struct msi_msg *msg) | |
1177 | { | |
dced35ae | 1178 | struct intel_iommu *iommu = irq_get_handler_data(irq); |
0ac2491f SS |
1179 | unsigned long flag; |
1180 | ||
1f5b3c3f | 1181 | raw_spin_lock_irqsave(&iommu->register_lock, flag); |
0ac2491f SS |
1182 | msg->data = readl(iommu->reg + DMAR_FEDATA_REG); |
1183 | msg->address_lo = readl(iommu->reg + DMAR_FEADDR_REG); | |
1184 | msg->address_hi = readl(iommu->reg + DMAR_FEUADDR_REG); | |
1f5b3c3f | 1185 | raw_spin_unlock_irqrestore(&iommu->register_lock, flag); |
0ac2491f SS |
1186 | } |
1187 | ||
1188 | static int dmar_fault_do_one(struct intel_iommu *iommu, int type, | |
1189 | u8 fault_reason, u16 source_id, unsigned long long addr) | |
1190 | { | |
1191 | const char *reason; | |
9d783ba0 | 1192 | int fault_type; |
0ac2491f | 1193 | |
9d783ba0 | 1194 | reason = dmar_get_fault_reason(fault_reason, &fault_type); |
0ac2491f | 1195 | |
9d783ba0 | 1196 | if (fault_type == INTR_REMAP) |
bf947fcb | 1197 | pr_err("INTR-REMAP: Request device [[%02x:%02x.%d] " |
9d783ba0 SS |
1198 | "fault index %llx\n" |
1199 | "INTR-REMAP:[fault reason %02d] %s\n", | |
1200 | (source_id >> 8), PCI_SLOT(source_id & 0xFF), | |
1201 | PCI_FUNC(source_id & 0xFF), addr >> 48, | |
1202 | fault_reason, reason); | |
1203 | else | |
bf947fcb | 1204 | pr_err("DMAR:[%s] Request device [%02x:%02x.%d] " |
9d783ba0 SS |
1205 | "fault addr %llx \n" |
1206 | "DMAR:[fault reason %02d] %s\n", | |
1207 | (type ? "DMA Read" : "DMA Write"), | |
1208 | (source_id >> 8), PCI_SLOT(source_id & 0xFF), | |
1209 | PCI_FUNC(source_id & 0xFF), addr, fault_reason, reason); | |
0ac2491f SS |
1210 | return 0; |
1211 | } | |
1212 | ||
1213 | #define PRIMARY_FAULT_REG_LEN (16) | |
1531a6a6 | 1214 | irqreturn_t dmar_fault(int irq, void *dev_id) |
0ac2491f SS |
1215 | { |
1216 | struct intel_iommu *iommu = dev_id; | |
1217 | int reg, fault_index; | |
1218 | u32 fault_status; | |
1219 | unsigned long flag; | |
1220 | ||
1f5b3c3f | 1221 | raw_spin_lock_irqsave(&iommu->register_lock, flag); |
0ac2491f | 1222 | fault_status = readl(iommu->reg + DMAR_FSTS_REG); |
9d783ba0 | 1223 | if (fault_status) |
bf947fcb | 1224 | pr_err("DRHD: handling fault status reg %x\n", fault_status); |
0ac2491f SS |
1225 | |
1226 | /* TBD: ignore advanced fault log currently */ | |
1227 | if (!(fault_status & DMA_FSTS_PPF)) | |
bd5cdad0 | 1228 | goto unlock_exit; |
0ac2491f SS |
1229 | |
1230 | fault_index = dma_fsts_fault_record_index(fault_status); | |
1231 | reg = cap_fault_reg_offset(iommu->cap); | |
1232 | while (1) { | |
1233 | u8 fault_reason; | |
1234 | u16 source_id; | |
1235 | u64 guest_addr; | |
1236 | int type; | |
1237 | u32 data; | |
1238 | ||
1239 | /* highest 32 bits */ | |
1240 | data = readl(iommu->reg + reg + | |
1241 | fault_index * PRIMARY_FAULT_REG_LEN + 12); | |
1242 | if (!(data & DMA_FRCD_F)) | |
1243 | break; | |
1244 | ||
1245 | fault_reason = dma_frcd_fault_reason(data); | |
1246 | type = dma_frcd_type(data); | |
1247 | ||
1248 | data = readl(iommu->reg + reg + | |
1249 | fault_index * PRIMARY_FAULT_REG_LEN + 8); | |
1250 | source_id = dma_frcd_source_id(data); | |
1251 | ||
1252 | guest_addr = dmar_readq(iommu->reg + reg + | |
1253 | fault_index * PRIMARY_FAULT_REG_LEN); | |
1254 | guest_addr = dma_frcd_page_addr(guest_addr); | |
1255 | /* clear the fault */ | |
1256 | writel(DMA_FRCD_F, iommu->reg + reg + | |
1257 | fault_index * PRIMARY_FAULT_REG_LEN + 12); | |
1258 | ||
1f5b3c3f | 1259 | raw_spin_unlock_irqrestore(&iommu->register_lock, flag); |
0ac2491f SS |
1260 | |
1261 | dmar_fault_do_one(iommu, type, fault_reason, | |
1262 | source_id, guest_addr); | |
1263 | ||
1264 | fault_index++; | |
8211a7b5 | 1265 | if (fault_index >= cap_num_fault_regs(iommu->cap)) |
0ac2491f | 1266 | fault_index = 0; |
1f5b3c3f | 1267 | raw_spin_lock_irqsave(&iommu->register_lock, flag); |
0ac2491f | 1268 | } |
0ac2491f | 1269 | |
bd5cdad0 LZH |
1270 | writel(DMA_FSTS_PFO | DMA_FSTS_PPF, iommu->reg + DMAR_FSTS_REG); |
1271 | ||
1272 | unlock_exit: | |
1f5b3c3f | 1273 | raw_spin_unlock_irqrestore(&iommu->register_lock, flag); |
0ac2491f SS |
1274 | return IRQ_HANDLED; |
1275 | } | |
1276 | ||
1277 | int dmar_set_interrupt(struct intel_iommu *iommu) | |
1278 | { | |
1279 | int irq, ret; | |
1280 | ||
9d783ba0 SS |
1281 | /* |
1282 | * Check if the fault interrupt is already initialized. | |
1283 | */ | |
1284 | if (iommu->irq) | |
1285 | return 0; | |
1286 | ||
0ac2491f SS |
1287 | irq = create_irq(); |
1288 | if (!irq) { | |
bf947fcb | 1289 | pr_err("IOMMU: no free vectors\n"); |
0ac2491f SS |
1290 | return -EINVAL; |
1291 | } | |
1292 | ||
dced35ae | 1293 | irq_set_handler_data(irq, iommu); |
0ac2491f SS |
1294 | iommu->irq = irq; |
1295 | ||
1296 | ret = arch_setup_dmar_msi(irq); | |
1297 | if (ret) { | |
dced35ae | 1298 | irq_set_handler_data(irq, NULL); |
0ac2491f SS |
1299 | iommu->irq = 0; |
1300 | destroy_irq(irq); | |
dd726435 | 1301 | return ret; |
0ac2491f SS |
1302 | } |
1303 | ||
477694e7 | 1304 | ret = request_irq(irq, dmar_fault, IRQF_NO_THREAD, iommu->name, iommu); |
0ac2491f | 1305 | if (ret) |
bf947fcb | 1306 | pr_err("IOMMU: can't request irq\n"); |
0ac2491f SS |
1307 | return ret; |
1308 | } | |
9d783ba0 SS |
1309 | |
1310 | int __init enable_drhd_fault_handling(void) | |
1311 | { | |
1312 | struct dmar_drhd_unit *drhd; | |
7c919779 | 1313 | struct intel_iommu *iommu; |
9d783ba0 SS |
1314 | |
1315 | /* | |
1316 | * Enable fault control interrupt. | |
1317 | */ | |
7c919779 | 1318 | for_each_iommu(iommu, drhd) { |
bd5cdad0 | 1319 | u32 fault_status; |
7c919779 | 1320 | int ret = dmar_set_interrupt(iommu); |
9d783ba0 SS |
1321 | |
1322 | if (ret) { | |
e9071b0b | 1323 | pr_err("DRHD %Lx: failed to enable fault, interrupt, ret %d\n", |
9d783ba0 SS |
1324 | (unsigned long long)drhd->reg_base_addr, ret); |
1325 | return -1; | |
1326 | } | |
7f99d946 SS |
1327 | |
1328 | /* | |
1329 | * Clear any previous faults. | |
1330 | */ | |
1331 | dmar_fault(iommu->irq, iommu); | |
bd5cdad0 LZH |
1332 | fault_status = readl(iommu->reg + DMAR_FSTS_REG); |
1333 | writel(fault_status, iommu->reg + DMAR_FSTS_REG); | |
9d783ba0 SS |
1334 | } |
1335 | ||
1336 | return 0; | |
1337 | } | |
eb4a52bc FY |
1338 | |
1339 | /* | |
1340 | * Re-enable Queued Invalidation interface. | |
1341 | */ | |
1342 | int dmar_reenable_qi(struct intel_iommu *iommu) | |
1343 | { | |
1344 | if (!ecap_qis(iommu->ecap)) | |
1345 | return -ENOENT; | |
1346 | ||
1347 | if (!iommu->qi) | |
1348 | return -ENOENT; | |
1349 | ||
1350 | /* | |
1351 | * First disable queued invalidation. | |
1352 | */ | |
1353 | dmar_disable_qi(iommu); | |
1354 | /* | |
1355 | * Then enable queued invalidation again. Since there is no pending | |
1356 | * invalidation requests now, it's safe to re-enable queued | |
1357 | * invalidation. | |
1358 | */ | |
1359 | __dmar_enable_qi(iommu); | |
1360 | ||
1361 | return 0; | |
1362 | } | |
074835f0 YS |
1363 | |
1364 | /* | |
1365 | * Check interrupt remapping support in DMAR table description. | |
1366 | */ | |
0b8973a8 | 1367 | int __init dmar_ir_support(void) |
074835f0 YS |
1368 | { |
1369 | struct acpi_table_dmar *dmar; | |
1370 | dmar = (struct acpi_table_dmar *)dmar_tbl; | |
4f506e07 AP |
1371 | if (!dmar) |
1372 | return 0; | |
074835f0 YS |
1373 | return dmar->flags & 0x1; |
1374 | } | |
694835dc | 1375 | |
a868e6b7 JL |
1376 | static int __init dmar_free_unused_resources(void) |
1377 | { | |
1378 | struct dmar_drhd_unit *dmaru, *dmaru_n; | |
1379 | ||
1380 | /* DMAR units are in use */ | |
1381 | if (irq_remapping_enabled || intel_iommu_enabled) | |
1382 | return 0; | |
1383 | ||
1384 | list_for_each_entry_safe(dmaru, dmaru_n, &dmar_drhd_units, list) { | |
1385 | list_del(&dmaru->list); | |
1386 | dmar_free_drhd(dmaru); | |
1387 | } | |
1388 | ||
1389 | return 0; | |
1390 | } | |
1391 | ||
1392 | late_initcall(dmar_free_unused_resources); | |
4db77ff3 | 1393 | IOMMU_INIT_POST(detect_intel_iommu); |