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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 | ||
29 | #include <linux/pci.h> | |
30 | #include <linux/dmar.h> | |
093f87d2 | 31 | #include "iova.h" |
f661197e | 32 | #include "intel-iommu.h" |
10e5247f KA |
33 | |
34 | #undef PREFIX | |
35 | #define PREFIX "DMAR:" | |
36 | ||
37 | /* No locks are needed as DMA remapping hardware unit | |
38 | * list is constructed at boot time and hotplug of | |
39 | * these units are not supported by the architecture. | |
40 | */ | |
41 | LIST_HEAD(dmar_drhd_units); | |
42 | LIST_HEAD(dmar_rmrr_units); | |
43 | ||
44 | static struct acpi_table_header * __initdata dmar_tbl; | |
45 | ||
46 | static void __init dmar_register_drhd_unit(struct dmar_drhd_unit *drhd) | |
47 | { | |
48 | /* | |
49 | * add INCLUDE_ALL at the tail, so scan the list will find it at | |
50 | * the very end. | |
51 | */ | |
52 | if (drhd->include_all) | |
53 | list_add_tail(&drhd->list, &dmar_drhd_units); | |
54 | else | |
55 | list_add(&drhd->list, &dmar_drhd_units); | |
56 | } | |
57 | ||
58 | static void __init dmar_register_rmrr_unit(struct dmar_rmrr_unit *rmrr) | |
59 | { | |
60 | list_add(&rmrr->list, &dmar_rmrr_units); | |
61 | } | |
62 | ||
63 | static int __init dmar_parse_one_dev_scope(struct acpi_dmar_device_scope *scope, | |
64 | struct pci_dev **dev, u16 segment) | |
65 | { | |
66 | struct pci_bus *bus; | |
67 | struct pci_dev *pdev = NULL; | |
68 | struct acpi_dmar_pci_path *path; | |
69 | int count; | |
70 | ||
71 | bus = pci_find_bus(segment, scope->bus); | |
72 | path = (struct acpi_dmar_pci_path *)(scope + 1); | |
73 | count = (scope->length - sizeof(struct acpi_dmar_device_scope)) | |
74 | / sizeof(struct acpi_dmar_pci_path); | |
75 | ||
76 | while (count) { | |
77 | if (pdev) | |
78 | pci_dev_put(pdev); | |
79 | /* | |
80 | * Some BIOSes list non-exist devices in DMAR table, just | |
81 | * ignore it | |
82 | */ | |
83 | if (!bus) { | |
84 | printk(KERN_WARNING | |
85 | PREFIX "Device scope bus [%d] not found\n", | |
86 | scope->bus); | |
87 | break; | |
88 | } | |
89 | pdev = pci_get_slot(bus, PCI_DEVFN(path->dev, path->fn)); | |
90 | if (!pdev) { | |
91 | printk(KERN_WARNING PREFIX | |
92 | "Device scope device [%04x:%02x:%02x.%02x] not found\n", | |
93 | segment, bus->number, path->dev, path->fn); | |
94 | break; | |
95 | } | |
96 | path ++; | |
97 | count --; | |
98 | bus = pdev->subordinate; | |
99 | } | |
100 | if (!pdev) { | |
101 | printk(KERN_WARNING PREFIX | |
102 | "Device scope device [%04x:%02x:%02x.%02x] not found\n", | |
103 | segment, scope->bus, path->dev, path->fn); | |
104 | *dev = NULL; | |
105 | return 0; | |
106 | } | |
107 | if ((scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT && \ | |
108 | pdev->subordinate) || (scope->entry_type == \ | |
109 | ACPI_DMAR_SCOPE_TYPE_BRIDGE && !pdev->subordinate)) { | |
110 | pci_dev_put(pdev); | |
111 | printk(KERN_WARNING PREFIX | |
112 | "Device scope type does not match for %s\n", | |
113 | pci_name(pdev)); | |
114 | return -EINVAL; | |
115 | } | |
116 | *dev = pdev; | |
117 | return 0; | |
118 | } | |
119 | ||
120 | static int __init dmar_parse_dev_scope(void *start, void *end, int *cnt, | |
121 | struct pci_dev ***devices, u16 segment) | |
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)++; | |
134 | else | |
135 | printk(KERN_WARNING PREFIX | |
136 | "Unsupported device scope\n"); | |
137 | start += scope->length; | |
138 | } | |
139 | if (*cnt == 0) | |
140 | return 0; | |
141 | ||
142 | *devices = kcalloc(*cnt, sizeof(struct pci_dev *), GFP_KERNEL); | |
143 | if (!*devices) | |
144 | return -ENOMEM; | |
145 | ||
146 | start = tmp; | |
147 | index = 0; | |
148 | while (start < end) { | |
149 | scope = start; | |
150 | if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT || | |
151 | scope->entry_type == ACPI_DMAR_SCOPE_TYPE_BRIDGE) { | |
152 | ret = dmar_parse_one_dev_scope(scope, | |
153 | &(*devices)[index], segment); | |
154 | if (ret) { | |
155 | kfree(*devices); | |
156 | return ret; | |
157 | } | |
158 | index ++; | |
159 | } | |
160 | start += scope->length; | |
161 | } | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
166 | /** | |
167 | * dmar_parse_one_drhd - parses exactly one DMA remapping hardware definition | |
168 | * structure which uniquely represent one DMA remapping hardware unit | |
169 | * present in the platform | |
170 | */ | |
171 | static int __init | |
172 | dmar_parse_one_drhd(struct acpi_dmar_header *header) | |
173 | { | |
174 | struct acpi_dmar_hardware_unit *drhd; | |
175 | struct dmar_drhd_unit *dmaru; | |
176 | int ret = 0; | |
177 | static int include_all; | |
178 | ||
179 | dmaru = kzalloc(sizeof(*dmaru), GFP_KERNEL); | |
180 | if (!dmaru) | |
181 | return -ENOMEM; | |
182 | ||
183 | drhd = (struct acpi_dmar_hardware_unit *)header; | |
184 | dmaru->reg_base_addr = drhd->address; | |
185 | dmaru->include_all = drhd->flags & 0x1; /* BIT0: INCLUDE_ALL */ | |
186 | ||
187 | if (!dmaru->include_all) | |
188 | ret = dmar_parse_dev_scope((void *)(drhd + 1), | |
189 | ((void *)drhd) + header->length, | |
190 | &dmaru->devices_cnt, &dmaru->devices, | |
191 | drhd->segment); | |
192 | else { | |
193 | /* Only allow one INCLUDE_ALL */ | |
194 | if (include_all) { | |
195 | printk(KERN_WARNING PREFIX "Only one INCLUDE_ALL " | |
196 | "device scope is allowed\n"); | |
197 | ret = -EINVAL; | |
198 | } | |
199 | include_all = 1; | |
200 | } | |
201 | ||
202 | if (ret || (dmaru->devices_cnt == 0 && !dmaru->include_all)) | |
203 | kfree(dmaru); | |
204 | else | |
205 | dmar_register_drhd_unit(dmaru); | |
206 | return ret; | |
207 | } | |
208 | ||
209 | static int __init | |
210 | dmar_parse_one_rmrr(struct acpi_dmar_header *header) | |
211 | { | |
212 | struct acpi_dmar_reserved_memory *rmrr; | |
213 | struct dmar_rmrr_unit *rmrru; | |
214 | int ret = 0; | |
215 | ||
216 | rmrru = kzalloc(sizeof(*rmrru), GFP_KERNEL); | |
217 | if (!rmrru) | |
218 | return -ENOMEM; | |
219 | ||
220 | rmrr = (struct acpi_dmar_reserved_memory *)header; | |
221 | rmrru->base_address = rmrr->base_address; | |
222 | rmrru->end_address = rmrr->end_address; | |
223 | ret = dmar_parse_dev_scope((void *)(rmrr + 1), | |
224 | ((void *)rmrr) + header->length, | |
225 | &rmrru->devices_cnt, &rmrru->devices, rmrr->segment); | |
226 | ||
227 | if (ret || (rmrru->devices_cnt == 0)) | |
228 | kfree(rmrru); | |
229 | else | |
230 | dmar_register_rmrr_unit(rmrru); | |
231 | return ret; | |
232 | } | |
233 | ||
234 | static void __init | |
235 | dmar_table_print_dmar_entry(struct acpi_dmar_header *header) | |
236 | { | |
237 | struct acpi_dmar_hardware_unit *drhd; | |
238 | struct acpi_dmar_reserved_memory *rmrr; | |
239 | ||
240 | switch (header->type) { | |
241 | case ACPI_DMAR_TYPE_HARDWARE_UNIT: | |
242 | drhd = (struct acpi_dmar_hardware_unit *)header; | |
243 | printk (KERN_INFO PREFIX | |
244 | "DRHD (flags: 0x%08x)base: 0x%016Lx\n", | |
245 | drhd->flags, drhd->address); | |
246 | break; | |
247 | case ACPI_DMAR_TYPE_RESERVED_MEMORY: | |
248 | rmrr = (struct acpi_dmar_reserved_memory *)header; | |
249 | ||
250 | printk (KERN_INFO PREFIX | |
251 | "RMRR base: 0x%016Lx end: 0x%016Lx\n", | |
252 | rmrr->base_address, rmrr->end_address); | |
253 | break; | |
254 | } | |
255 | } | |
256 | ||
257 | /** | |
258 | * parse_dmar_table - parses the DMA reporting table | |
259 | */ | |
260 | static int __init | |
261 | parse_dmar_table(void) | |
262 | { | |
263 | struct acpi_table_dmar *dmar; | |
264 | struct acpi_dmar_header *entry_header; | |
265 | int ret = 0; | |
266 | ||
267 | dmar = (struct acpi_table_dmar *)dmar_tbl; | |
268 | if (!dmar) | |
269 | return -ENODEV; | |
270 | ||
093f87d2 FY |
271 | if (dmar->width < PAGE_SHIFT_4K - 1) { |
272 | printk(KERN_WARNING PREFIX "Invalid DMAR haw\n"); | |
10e5247f KA |
273 | return -EINVAL; |
274 | } | |
275 | ||
276 | printk (KERN_INFO PREFIX "Host address width %d\n", | |
277 | dmar->width + 1); | |
278 | ||
279 | entry_header = (struct acpi_dmar_header *)(dmar + 1); | |
280 | while (((unsigned long)entry_header) < | |
281 | (((unsigned long)dmar) + dmar_tbl->length)) { | |
282 | dmar_table_print_dmar_entry(entry_header); | |
283 | ||
284 | switch (entry_header->type) { | |
285 | case ACPI_DMAR_TYPE_HARDWARE_UNIT: | |
286 | ret = dmar_parse_one_drhd(entry_header); | |
287 | break; | |
288 | case ACPI_DMAR_TYPE_RESERVED_MEMORY: | |
289 | ret = dmar_parse_one_rmrr(entry_header); | |
290 | break; | |
291 | default: | |
292 | printk(KERN_WARNING PREFIX | |
293 | "Unknown DMAR structure type\n"); | |
294 | ret = 0; /* for forward compatibility */ | |
295 | break; | |
296 | } | |
297 | if (ret) | |
298 | break; | |
299 | ||
300 | entry_header = ((void *)entry_header + entry_header->length); | |
301 | } | |
302 | return ret; | |
303 | } | |
304 | ||
e61d98d8 SS |
305 | int dmar_pci_device_match(struct pci_dev *devices[], int cnt, |
306 | struct pci_dev *dev) | |
307 | { | |
308 | int index; | |
309 | ||
310 | while (dev) { | |
311 | for (index = 0; index < cnt; index++) | |
312 | if (dev == devices[index]) | |
313 | return 1; | |
314 | ||
315 | /* Check our parent */ | |
316 | dev = dev->bus->self; | |
317 | } | |
318 | ||
319 | return 0; | |
320 | } | |
321 | ||
322 | struct dmar_drhd_unit * | |
323 | dmar_find_matched_drhd_unit(struct pci_dev *dev) | |
324 | { | |
325 | struct dmar_drhd_unit *drhd = NULL; | |
326 | ||
327 | list_for_each_entry(drhd, &dmar_drhd_units, list) { | |
328 | if (drhd->include_all || dmar_pci_device_match(drhd->devices, | |
329 | drhd->devices_cnt, dev)) | |
330 | return drhd; | |
331 | } | |
332 | ||
333 | return NULL; | |
334 | } | |
335 | ||
10e5247f KA |
336 | |
337 | int __init dmar_table_init(void) | |
338 | { | |
339 | ||
093f87d2 FY |
340 | int ret; |
341 | ||
342 | ret = parse_dmar_table(); | |
343 | if (ret) { | |
344 | printk(KERN_INFO PREFIX "parse DMAR table failure.\n"); | |
345 | return ret; | |
346 | } | |
347 | ||
10e5247f KA |
348 | if (list_empty(&dmar_drhd_units)) { |
349 | printk(KERN_INFO PREFIX "No DMAR devices found\n"); | |
350 | return -ENODEV; | |
351 | } | |
093f87d2 FY |
352 | |
353 | if (list_empty(&dmar_rmrr_units)) { | |
354 | printk(KERN_INFO PREFIX "No RMRR found\n"); | |
355 | return -ENODEV; | |
356 | } | |
357 | ||
10e5247f KA |
358 | return 0; |
359 | } | |
360 | ||
361 | /** | |
362 | * early_dmar_detect - checks to see if the platform supports DMAR devices | |
363 | */ | |
364 | int __init early_dmar_detect(void) | |
365 | { | |
366 | acpi_status status = AE_OK; | |
367 | ||
368 | /* if we could find DMAR table, then there are DMAR devices */ | |
369 | status = acpi_get_table(ACPI_SIG_DMAR, 0, | |
370 | (struct acpi_table_header **)&dmar_tbl); | |
371 | ||
372 | if (ACPI_SUCCESS(status) && !dmar_tbl) { | |
373 | printk (KERN_WARNING PREFIX "Unable to map DMAR\n"); | |
374 | status = AE_NOT_FOUND; | |
375 | } | |
376 | ||
377 | return (ACPI_SUCCESS(status) ? 1 : 0); | |
378 | } | |
e61d98d8 SS |
379 | |
380 | struct intel_iommu *alloc_iommu(struct intel_iommu *iommu, | |
381 | struct dmar_drhd_unit *drhd) | |
382 | { | |
383 | int map_size; | |
384 | u32 ver; | |
385 | ||
386 | iommu->reg = ioremap(drhd->reg_base_addr, PAGE_SIZE_4K); | |
387 | if (!iommu->reg) { | |
388 | printk(KERN_ERR "IOMMU: can't map the region\n"); | |
389 | goto error; | |
390 | } | |
391 | iommu->cap = dmar_readq(iommu->reg + DMAR_CAP_REG); | |
392 | iommu->ecap = dmar_readq(iommu->reg + DMAR_ECAP_REG); | |
393 | ||
394 | /* the registers might be more than one page */ | |
395 | map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap), | |
396 | cap_max_fault_reg_offset(iommu->cap)); | |
397 | map_size = PAGE_ALIGN_4K(map_size); | |
398 | if (map_size > PAGE_SIZE_4K) { | |
399 | iounmap(iommu->reg); | |
400 | iommu->reg = ioremap(drhd->reg_base_addr, map_size); | |
401 | if (!iommu->reg) { | |
402 | printk(KERN_ERR "IOMMU: can't map the region\n"); | |
403 | goto error; | |
404 | } | |
405 | } | |
406 | ||
407 | ver = readl(iommu->reg + DMAR_VER_REG); | |
408 | pr_debug("IOMMU %llx: ver %d:%d cap %llx ecap %llx\n", | |
409 | drhd->reg_base_addr, DMAR_VER_MAJOR(ver), DMAR_VER_MINOR(ver), | |
410 | iommu->cap, iommu->ecap); | |
411 | ||
412 | spin_lock_init(&iommu->register_lock); | |
413 | ||
414 | drhd->iommu = iommu; | |
415 | return iommu; | |
416 | error: | |
417 | kfree(iommu); | |
418 | return NULL; | |
419 | } | |
420 | ||
421 | void free_iommu(struct intel_iommu *iommu) | |
422 | { | |
423 | if (!iommu) | |
424 | return; | |
425 | ||
426 | #ifdef CONFIG_DMAR | |
427 | free_dmar_iommu(iommu); | |
428 | #endif | |
429 | ||
430 | if (iommu->reg) | |
431 | iounmap(iommu->reg); | |
432 | kfree(iommu); | |
433 | } |