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ba395927 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> | |
ba395927 KA |
21 | */ |
22 | ||
23 | #include <linux/init.h> | |
24 | #include <linux/bitmap.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/irq.h> | |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/sysdev.h> | |
29 | #include <linux/spinlock.h> | |
30 | #include <linux/pci.h> | |
31 | #include <linux/dmar.h> | |
32 | #include <linux/dma-mapping.h> | |
33 | #include <linux/mempool.h> | |
34 | #include "iova.h" | |
35 | #include "intel-iommu.h" | |
36 | #include <asm/proto.h> /* force_iommu in this header in x86-64*/ | |
37 | #include <asm/cacheflush.h> | |
395624fc | 38 | #include <asm/gart.h> |
ba395927 KA |
39 | #include "pci.h" |
40 | ||
41 | #define IS_GFX_DEVICE(pdev) ((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY) | |
42 | #define IS_ISA_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA) | |
43 | ||
44 | #define IOAPIC_RANGE_START (0xfee00000) | |
45 | #define IOAPIC_RANGE_END (0xfeefffff) | |
46 | #define IOVA_START_ADDR (0x1000) | |
47 | ||
48 | #define DEFAULT_DOMAIN_ADDRESS_WIDTH 48 | |
49 | ||
50 | #define DMAR_OPERATION_TIMEOUT (HZ*60) /* 1m */ | |
51 | ||
52 | #define DOMAIN_MAX_ADDR(gaw) ((((u64)1) << gaw) - 1) | |
53 | ||
54 | static void domain_remove_dev_info(struct dmar_domain *domain); | |
55 | ||
56 | static int dmar_disabled; | |
57 | static int __initdata dmar_map_gfx = 1; | |
7d3b03ce | 58 | static int dmar_forcedac; |
ba395927 KA |
59 | |
60 | #define DUMMY_DEVICE_DOMAIN_INFO ((struct device_domain_info *)(-1)) | |
61 | static DEFINE_SPINLOCK(device_domain_lock); | |
62 | static LIST_HEAD(device_domain_list); | |
63 | ||
64 | static int __init intel_iommu_setup(char *str) | |
65 | { | |
66 | if (!str) | |
67 | return -EINVAL; | |
68 | while (*str) { | |
69 | if (!strncmp(str, "off", 3)) { | |
70 | dmar_disabled = 1; | |
71 | printk(KERN_INFO"Intel-IOMMU: disabled\n"); | |
72 | } else if (!strncmp(str, "igfx_off", 8)) { | |
73 | dmar_map_gfx = 0; | |
74 | printk(KERN_INFO | |
75 | "Intel-IOMMU: disable GFX device mapping\n"); | |
7d3b03ce KA |
76 | } else if (!strncmp(str, "forcedac", 8)) { |
77 | printk (KERN_INFO | |
78 | "Intel-IOMMU: Forcing DAC for PCI devices\n"); | |
79 | dmar_forcedac = 1; | |
ba395927 KA |
80 | } |
81 | ||
82 | str += strcspn(str, ","); | |
83 | while (*str == ',') | |
84 | str++; | |
85 | } | |
86 | return 0; | |
87 | } | |
88 | __setup("intel_iommu=", intel_iommu_setup); | |
89 | ||
90 | static struct kmem_cache *iommu_domain_cache; | |
91 | static struct kmem_cache *iommu_devinfo_cache; | |
92 | static struct kmem_cache *iommu_iova_cache; | |
93 | ||
eb3fa7cb KA |
94 | static inline void *iommu_kmem_cache_alloc(struct kmem_cache *cachep) |
95 | { | |
96 | unsigned int flags; | |
97 | void *vaddr; | |
98 | ||
99 | /* trying to avoid low memory issues */ | |
100 | flags = current->flags & PF_MEMALLOC; | |
101 | current->flags |= PF_MEMALLOC; | |
102 | vaddr = kmem_cache_alloc(cachep, GFP_ATOMIC); | |
103 | current->flags &= (~PF_MEMALLOC | flags); | |
104 | return vaddr; | |
105 | } | |
106 | ||
107 | ||
ba395927 KA |
108 | static inline void *alloc_pgtable_page(void) |
109 | { | |
eb3fa7cb KA |
110 | unsigned int flags; |
111 | void *vaddr; | |
112 | ||
113 | /* trying to avoid low memory issues */ | |
114 | flags = current->flags & PF_MEMALLOC; | |
115 | current->flags |= PF_MEMALLOC; | |
116 | vaddr = (void *)get_zeroed_page(GFP_ATOMIC); | |
117 | current->flags &= (~PF_MEMALLOC | flags); | |
118 | return vaddr; | |
ba395927 KA |
119 | } |
120 | ||
121 | static inline void free_pgtable_page(void *vaddr) | |
122 | { | |
123 | free_page((unsigned long)vaddr); | |
124 | } | |
125 | ||
126 | static inline void *alloc_domain_mem(void) | |
127 | { | |
eb3fa7cb | 128 | return iommu_kmem_cache_alloc(iommu_domain_cache); |
ba395927 KA |
129 | } |
130 | ||
131 | static inline void free_domain_mem(void *vaddr) | |
132 | { | |
133 | kmem_cache_free(iommu_domain_cache, vaddr); | |
134 | } | |
135 | ||
136 | static inline void * alloc_devinfo_mem(void) | |
137 | { | |
eb3fa7cb | 138 | return iommu_kmem_cache_alloc(iommu_devinfo_cache); |
ba395927 KA |
139 | } |
140 | ||
141 | static inline void free_devinfo_mem(void *vaddr) | |
142 | { | |
143 | kmem_cache_free(iommu_devinfo_cache, vaddr); | |
144 | } | |
145 | ||
146 | struct iova *alloc_iova_mem(void) | |
147 | { | |
eb3fa7cb | 148 | return iommu_kmem_cache_alloc(iommu_iova_cache); |
ba395927 KA |
149 | } |
150 | ||
151 | void free_iova_mem(struct iova *iova) | |
152 | { | |
153 | kmem_cache_free(iommu_iova_cache, iova); | |
154 | } | |
155 | ||
156 | static inline void __iommu_flush_cache( | |
157 | struct intel_iommu *iommu, void *addr, int size) | |
158 | { | |
159 | if (!ecap_coherent(iommu->ecap)) | |
160 | clflush_cache_range(addr, size); | |
161 | } | |
162 | ||
163 | /* Gets context entry for a given bus and devfn */ | |
164 | static struct context_entry * device_to_context_entry(struct intel_iommu *iommu, | |
165 | u8 bus, u8 devfn) | |
166 | { | |
167 | struct root_entry *root; | |
168 | struct context_entry *context; | |
169 | unsigned long phy_addr; | |
170 | unsigned long flags; | |
171 | ||
172 | spin_lock_irqsave(&iommu->lock, flags); | |
173 | root = &iommu->root_entry[bus]; | |
174 | context = get_context_addr_from_root(root); | |
175 | if (!context) { | |
176 | context = (struct context_entry *)alloc_pgtable_page(); | |
177 | if (!context) { | |
178 | spin_unlock_irqrestore(&iommu->lock, flags); | |
179 | return NULL; | |
180 | } | |
181 | __iommu_flush_cache(iommu, (void *)context, PAGE_SIZE_4K); | |
182 | phy_addr = virt_to_phys((void *)context); | |
183 | set_root_value(root, phy_addr); | |
184 | set_root_present(root); | |
185 | __iommu_flush_cache(iommu, root, sizeof(*root)); | |
186 | } | |
187 | spin_unlock_irqrestore(&iommu->lock, flags); | |
188 | return &context[devfn]; | |
189 | } | |
190 | ||
191 | static int device_context_mapped(struct intel_iommu *iommu, u8 bus, u8 devfn) | |
192 | { | |
193 | struct root_entry *root; | |
194 | struct context_entry *context; | |
195 | int ret; | |
196 | unsigned long flags; | |
197 | ||
198 | spin_lock_irqsave(&iommu->lock, flags); | |
199 | root = &iommu->root_entry[bus]; | |
200 | context = get_context_addr_from_root(root); | |
201 | if (!context) { | |
202 | ret = 0; | |
203 | goto out; | |
204 | } | |
205 | ret = context_present(context[devfn]); | |
206 | out: | |
207 | spin_unlock_irqrestore(&iommu->lock, flags); | |
208 | return ret; | |
209 | } | |
210 | ||
211 | static void clear_context_table(struct intel_iommu *iommu, u8 bus, u8 devfn) | |
212 | { | |
213 | struct root_entry *root; | |
214 | struct context_entry *context; | |
215 | unsigned long flags; | |
216 | ||
217 | spin_lock_irqsave(&iommu->lock, flags); | |
218 | root = &iommu->root_entry[bus]; | |
219 | context = get_context_addr_from_root(root); | |
220 | if (context) { | |
221 | context_clear_entry(context[devfn]); | |
222 | __iommu_flush_cache(iommu, &context[devfn], \ | |
223 | sizeof(*context)); | |
224 | } | |
225 | spin_unlock_irqrestore(&iommu->lock, flags); | |
226 | } | |
227 | ||
228 | static void free_context_table(struct intel_iommu *iommu) | |
229 | { | |
230 | struct root_entry *root; | |
231 | int i; | |
232 | unsigned long flags; | |
233 | struct context_entry *context; | |
234 | ||
235 | spin_lock_irqsave(&iommu->lock, flags); | |
236 | if (!iommu->root_entry) { | |
237 | goto out; | |
238 | } | |
239 | for (i = 0; i < ROOT_ENTRY_NR; i++) { | |
240 | root = &iommu->root_entry[i]; | |
241 | context = get_context_addr_from_root(root); | |
242 | if (context) | |
243 | free_pgtable_page(context); | |
244 | } | |
245 | free_pgtable_page(iommu->root_entry); | |
246 | iommu->root_entry = NULL; | |
247 | out: | |
248 | spin_unlock_irqrestore(&iommu->lock, flags); | |
249 | } | |
250 | ||
251 | /* page table handling */ | |
252 | #define LEVEL_STRIDE (9) | |
253 | #define LEVEL_MASK (((u64)1 << LEVEL_STRIDE) - 1) | |
254 | ||
255 | static inline int agaw_to_level(int agaw) | |
256 | { | |
257 | return agaw + 2; | |
258 | } | |
259 | ||
260 | static inline int agaw_to_width(int agaw) | |
261 | { | |
262 | return 30 + agaw * LEVEL_STRIDE; | |
263 | ||
264 | } | |
265 | ||
266 | static inline int width_to_agaw(int width) | |
267 | { | |
268 | return (width - 30) / LEVEL_STRIDE; | |
269 | } | |
270 | ||
271 | static inline unsigned int level_to_offset_bits(int level) | |
272 | { | |
273 | return (12 + (level - 1) * LEVEL_STRIDE); | |
274 | } | |
275 | ||
276 | static inline int address_level_offset(u64 addr, int level) | |
277 | { | |
278 | return ((addr >> level_to_offset_bits(level)) & LEVEL_MASK); | |
279 | } | |
280 | ||
281 | static inline u64 level_mask(int level) | |
282 | { | |
283 | return ((u64)-1 << level_to_offset_bits(level)); | |
284 | } | |
285 | ||
286 | static inline u64 level_size(int level) | |
287 | { | |
288 | return ((u64)1 << level_to_offset_bits(level)); | |
289 | } | |
290 | ||
291 | static inline u64 align_to_level(u64 addr, int level) | |
292 | { | |
293 | return ((addr + level_size(level) - 1) & level_mask(level)); | |
294 | } | |
295 | ||
296 | static struct dma_pte * addr_to_dma_pte(struct dmar_domain *domain, u64 addr) | |
297 | { | |
298 | int addr_width = agaw_to_width(domain->agaw); | |
299 | struct dma_pte *parent, *pte = NULL; | |
300 | int level = agaw_to_level(domain->agaw); | |
301 | int offset; | |
302 | unsigned long flags; | |
303 | ||
304 | BUG_ON(!domain->pgd); | |
305 | ||
306 | addr &= (((u64)1) << addr_width) - 1; | |
307 | parent = domain->pgd; | |
308 | ||
309 | spin_lock_irqsave(&domain->mapping_lock, flags); | |
310 | while (level > 0) { | |
311 | void *tmp_page; | |
312 | ||
313 | offset = address_level_offset(addr, level); | |
314 | pte = &parent[offset]; | |
315 | if (level == 1) | |
316 | break; | |
317 | ||
318 | if (!dma_pte_present(*pte)) { | |
319 | tmp_page = alloc_pgtable_page(); | |
320 | ||
321 | if (!tmp_page) { | |
322 | spin_unlock_irqrestore(&domain->mapping_lock, | |
323 | flags); | |
324 | return NULL; | |
325 | } | |
326 | __iommu_flush_cache(domain->iommu, tmp_page, | |
327 | PAGE_SIZE_4K); | |
328 | dma_set_pte_addr(*pte, virt_to_phys(tmp_page)); | |
329 | /* | |
330 | * high level table always sets r/w, last level page | |
331 | * table control read/write | |
332 | */ | |
333 | dma_set_pte_readable(*pte); | |
334 | dma_set_pte_writable(*pte); | |
335 | __iommu_flush_cache(domain->iommu, pte, sizeof(*pte)); | |
336 | } | |
337 | parent = phys_to_virt(dma_pte_addr(*pte)); | |
338 | level--; | |
339 | } | |
340 | ||
341 | spin_unlock_irqrestore(&domain->mapping_lock, flags); | |
342 | return pte; | |
343 | } | |
344 | ||
345 | /* return address's pte at specific level */ | |
346 | static struct dma_pte *dma_addr_level_pte(struct dmar_domain *domain, u64 addr, | |
347 | int level) | |
348 | { | |
349 | struct dma_pte *parent, *pte = NULL; | |
350 | int total = agaw_to_level(domain->agaw); | |
351 | int offset; | |
352 | ||
353 | parent = domain->pgd; | |
354 | while (level <= total) { | |
355 | offset = address_level_offset(addr, total); | |
356 | pte = &parent[offset]; | |
357 | if (level == total) | |
358 | return pte; | |
359 | ||
360 | if (!dma_pte_present(*pte)) | |
361 | break; | |
362 | parent = phys_to_virt(dma_pte_addr(*pte)); | |
363 | total--; | |
364 | } | |
365 | return NULL; | |
366 | } | |
367 | ||
368 | /* clear one page's page table */ | |
369 | static void dma_pte_clear_one(struct dmar_domain *domain, u64 addr) | |
370 | { | |
371 | struct dma_pte *pte = NULL; | |
372 | ||
373 | /* get last level pte */ | |
374 | pte = dma_addr_level_pte(domain, addr, 1); | |
375 | ||
376 | if (pte) { | |
377 | dma_clear_pte(*pte); | |
378 | __iommu_flush_cache(domain->iommu, pte, sizeof(*pte)); | |
379 | } | |
380 | } | |
381 | ||
382 | /* clear last level pte, a tlb flush should be followed */ | |
383 | static void dma_pte_clear_range(struct dmar_domain *domain, u64 start, u64 end) | |
384 | { | |
385 | int addr_width = agaw_to_width(domain->agaw); | |
386 | ||
387 | start &= (((u64)1) << addr_width) - 1; | |
388 | end &= (((u64)1) << addr_width) - 1; | |
389 | /* in case it's partial page */ | |
390 | start = PAGE_ALIGN_4K(start); | |
391 | end &= PAGE_MASK_4K; | |
392 | ||
393 | /* we don't need lock here, nobody else touches the iova range */ | |
394 | while (start < end) { | |
395 | dma_pte_clear_one(domain, start); | |
396 | start += PAGE_SIZE_4K; | |
397 | } | |
398 | } | |
399 | ||
400 | /* free page table pages. last level pte should already be cleared */ | |
401 | static void dma_pte_free_pagetable(struct dmar_domain *domain, | |
402 | u64 start, u64 end) | |
403 | { | |
404 | int addr_width = agaw_to_width(domain->agaw); | |
405 | struct dma_pte *pte; | |
406 | int total = agaw_to_level(domain->agaw); | |
407 | int level; | |
408 | u64 tmp; | |
409 | ||
410 | start &= (((u64)1) << addr_width) - 1; | |
411 | end &= (((u64)1) << addr_width) - 1; | |
412 | ||
413 | /* we don't need lock here, nobody else touches the iova range */ | |
414 | level = 2; | |
415 | while (level <= total) { | |
416 | tmp = align_to_level(start, level); | |
417 | if (tmp >= end || (tmp + level_size(level) > end)) | |
418 | return; | |
419 | ||
420 | while (tmp < end) { | |
421 | pte = dma_addr_level_pte(domain, tmp, level); | |
422 | if (pte) { | |
423 | free_pgtable_page( | |
424 | phys_to_virt(dma_pte_addr(*pte))); | |
425 | dma_clear_pte(*pte); | |
426 | __iommu_flush_cache(domain->iommu, | |
427 | pte, sizeof(*pte)); | |
428 | } | |
429 | tmp += level_size(level); | |
430 | } | |
431 | level++; | |
432 | } | |
433 | /* free pgd */ | |
434 | if (start == 0 && end >= ((((u64)1) << addr_width) - 1)) { | |
435 | free_pgtable_page(domain->pgd); | |
436 | domain->pgd = NULL; | |
437 | } | |
438 | } | |
439 | ||
440 | /* iommu handling */ | |
441 | static int iommu_alloc_root_entry(struct intel_iommu *iommu) | |
442 | { | |
443 | struct root_entry *root; | |
444 | unsigned long flags; | |
445 | ||
446 | root = (struct root_entry *)alloc_pgtable_page(); | |
447 | if (!root) | |
448 | return -ENOMEM; | |
449 | ||
450 | __iommu_flush_cache(iommu, root, PAGE_SIZE_4K); | |
451 | ||
452 | spin_lock_irqsave(&iommu->lock, flags); | |
453 | iommu->root_entry = root; | |
454 | spin_unlock_irqrestore(&iommu->lock, flags); | |
455 | ||
456 | return 0; | |
457 | } | |
458 | ||
459 | #define IOMMU_WAIT_OP(iommu, offset, op, cond, sts) \ | |
460 | {\ | |
461 | unsigned long start_time = jiffies;\ | |
462 | while (1) {\ | |
463 | sts = op (iommu->reg + offset);\ | |
464 | if (cond)\ | |
465 | break;\ | |
466 | if (time_after(jiffies, start_time + DMAR_OPERATION_TIMEOUT))\ | |
467 | panic("DMAR hardware is malfunctioning\n");\ | |
468 | cpu_relax();\ | |
469 | }\ | |
470 | } | |
471 | ||
472 | static void iommu_set_root_entry(struct intel_iommu *iommu) | |
473 | { | |
474 | void *addr; | |
475 | u32 cmd, sts; | |
476 | unsigned long flag; | |
477 | ||
478 | addr = iommu->root_entry; | |
479 | ||
480 | spin_lock_irqsave(&iommu->register_lock, flag); | |
481 | dmar_writeq(iommu->reg + DMAR_RTADDR_REG, virt_to_phys(addr)); | |
482 | ||
483 | cmd = iommu->gcmd | DMA_GCMD_SRTP; | |
484 | writel(cmd, iommu->reg + DMAR_GCMD_REG); | |
485 | ||
486 | /* Make sure hardware complete it */ | |
487 | IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, | |
488 | readl, (sts & DMA_GSTS_RTPS), sts); | |
489 | ||
490 | spin_unlock_irqrestore(&iommu->register_lock, flag); | |
491 | } | |
492 | ||
493 | static void iommu_flush_write_buffer(struct intel_iommu *iommu) | |
494 | { | |
495 | u32 val; | |
496 | unsigned long flag; | |
497 | ||
498 | if (!cap_rwbf(iommu->cap)) | |
499 | return; | |
500 | val = iommu->gcmd | DMA_GCMD_WBF; | |
501 | ||
502 | spin_lock_irqsave(&iommu->register_lock, flag); | |
503 | writel(val, iommu->reg + DMAR_GCMD_REG); | |
504 | ||
505 | /* Make sure hardware complete it */ | |
506 | IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, | |
507 | readl, (!(val & DMA_GSTS_WBFS)), val); | |
508 | ||
509 | spin_unlock_irqrestore(&iommu->register_lock, flag); | |
510 | } | |
511 | ||
512 | /* return value determine if we need a write buffer flush */ | |
513 | static int __iommu_flush_context(struct intel_iommu *iommu, | |
514 | u16 did, u16 source_id, u8 function_mask, u64 type, | |
515 | int non_present_entry_flush) | |
516 | { | |
517 | u64 val = 0; | |
518 | unsigned long flag; | |
519 | ||
520 | /* | |
521 | * In the non-present entry flush case, if hardware doesn't cache | |
522 | * non-present entry we do nothing and if hardware cache non-present | |
523 | * entry, we flush entries of domain 0 (the domain id is used to cache | |
524 | * any non-present entries) | |
525 | */ | |
526 | if (non_present_entry_flush) { | |
527 | if (!cap_caching_mode(iommu->cap)) | |
528 | return 1; | |
529 | else | |
530 | did = 0; | |
531 | } | |
532 | ||
533 | switch (type) { | |
534 | case DMA_CCMD_GLOBAL_INVL: | |
535 | val = DMA_CCMD_GLOBAL_INVL; | |
536 | break; | |
537 | case DMA_CCMD_DOMAIN_INVL: | |
538 | val = DMA_CCMD_DOMAIN_INVL|DMA_CCMD_DID(did); | |
539 | break; | |
540 | case DMA_CCMD_DEVICE_INVL: | |
541 | val = DMA_CCMD_DEVICE_INVL|DMA_CCMD_DID(did) | |
542 | | DMA_CCMD_SID(source_id) | DMA_CCMD_FM(function_mask); | |
543 | break; | |
544 | default: | |
545 | BUG(); | |
546 | } | |
547 | val |= DMA_CCMD_ICC; | |
548 | ||
549 | spin_lock_irqsave(&iommu->register_lock, flag); | |
550 | dmar_writeq(iommu->reg + DMAR_CCMD_REG, val); | |
551 | ||
552 | /* Make sure hardware complete it */ | |
553 | IOMMU_WAIT_OP(iommu, DMAR_CCMD_REG, | |
554 | dmar_readq, (!(val & DMA_CCMD_ICC)), val); | |
555 | ||
556 | spin_unlock_irqrestore(&iommu->register_lock, flag); | |
557 | ||
558 | /* flush context entry will implictly flush write buffer */ | |
559 | return 0; | |
560 | } | |
561 | ||
562 | static int inline iommu_flush_context_global(struct intel_iommu *iommu, | |
563 | int non_present_entry_flush) | |
564 | { | |
565 | return __iommu_flush_context(iommu, 0, 0, 0, DMA_CCMD_GLOBAL_INVL, | |
566 | non_present_entry_flush); | |
567 | } | |
568 | ||
569 | static int inline iommu_flush_context_domain(struct intel_iommu *iommu, u16 did, | |
570 | int non_present_entry_flush) | |
571 | { | |
572 | return __iommu_flush_context(iommu, did, 0, 0, DMA_CCMD_DOMAIN_INVL, | |
573 | non_present_entry_flush); | |
574 | } | |
575 | ||
576 | static int inline iommu_flush_context_device(struct intel_iommu *iommu, | |
577 | u16 did, u16 source_id, u8 function_mask, int non_present_entry_flush) | |
578 | { | |
579 | return __iommu_flush_context(iommu, did, source_id, function_mask, | |
580 | DMA_CCMD_DEVICE_INVL, non_present_entry_flush); | |
581 | } | |
582 | ||
583 | /* return value determine if we need a write buffer flush */ | |
584 | static int __iommu_flush_iotlb(struct intel_iommu *iommu, u16 did, | |
585 | u64 addr, unsigned int size_order, u64 type, | |
586 | int non_present_entry_flush) | |
587 | { | |
588 | int tlb_offset = ecap_iotlb_offset(iommu->ecap); | |
589 | u64 val = 0, val_iva = 0; | |
590 | unsigned long flag; | |
591 | ||
592 | /* | |
593 | * In the non-present entry flush case, if hardware doesn't cache | |
594 | * non-present entry we do nothing and if hardware cache non-present | |
595 | * entry, we flush entries of domain 0 (the domain id is used to cache | |
596 | * any non-present entries) | |
597 | */ | |
598 | if (non_present_entry_flush) { | |
599 | if (!cap_caching_mode(iommu->cap)) | |
600 | return 1; | |
601 | else | |
602 | did = 0; | |
603 | } | |
604 | ||
605 | switch (type) { | |
606 | case DMA_TLB_GLOBAL_FLUSH: | |
607 | /* global flush doesn't need set IVA_REG */ | |
608 | val = DMA_TLB_GLOBAL_FLUSH|DMA_TLB_IVT; | |
609 | break; | |
610 | case DMA_TLB_DSI_FLUSH: | |
611 | val = DMA_TLB_DSI_FLUSH|DMA_TLB_IVT|DMA_TLB_DID(did); | |
612 | break; | |
613 | case DMA_TLB_PSI_FLUSH: | |
614 | val = DMA_TLB_PSI_FLUSH|DMA_TLB_IVT|DMA_TLB_DID(did); | |
615 | /* Note: always flush non-leaf currently */ | |
616 | val_iva = size_order | addr; | |
617 | break; | |
618 | default: | |
619 | BUG(); | |
620 | } | |
621 | /* Note: set drain read/write */ | |
622 | #if 0 | |
623 | /* | |
624 | * This is probably to be super secure.. Looks like we can | |
625 | * ignore it without any impact. | |
626 | */ | |
627 | if (cap_read_drain(iommu->cap)) | |
628 | val |= DMA_TLB_READ_DRAIN; | |
629 | #endif | |
630 | if (cap_write_drain(iommu->cap)) | |
631 | val |= DMA_TLB_WRITE_DRAIN; | |
632 | ||
633 | spin_lock_irqsave(&iommu->register_lock, flag); | |
634 | /* Note: Only uses first TLB reg currently */ | |
635 | if (val_iva) | |
636 | dmar_writeq(iommu->reg + tlb_offset, val_iva); | |
637 | dmar_writeq(iommu->reg + tlb_offset + 8, val); | |
638 | ||
639 | /* Make sure hardware complete it */ | |
640 | IOMMU_WAIT_OP(iommu, tlb_offset + 8, | |
641 | dmar_readq, (!(val & DMA_TLB_IVT)), val); | |
642 | ||
643 | spin_unlock_irqrestore(&iommu->register_lock, flag); | |
644 | ||
645 | /* check IOTLB invalidation granularity */ | |
646 | if (DMA_TLB_IAIG(val) == 0) | |
647 | printk(KERN_ERR"IOMMU: flush IOTLB failed\n"); | |
648 | if (DMA_TLB_IAIG(val) != DMA_TLB_IIRG(type)) | |
649 | pr_debug("IOMMU: tlb flush request %Lx, actual %Lx\n", | |
650 | DMA_TLB_IIRG(type), DMA_TLB_IAIG(val)); | |
651 | /* flush context entry will implictly flush write buffer */ | |
652 | return 0; | |
653 | } | |
654 | ||
655 | static int inline iommu_flush_iotlb_global(struct intel_iommu *iommu, | |
656 | int non_present_entry_flush) | |
657 | { | |
658 | return __iommu_flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH, | |
659 | non_present_entry_flush); | |
660 | } | |
661 | ||
662 | static int inline iommu_flush_iotlb_dsi(struct intel_iommu *iommu, u16 did, | |
663 | int non_present_entry_flush) | |
664 | { | |
665 | return __iommu_flush_iotlb(iommu, did, 0, 0, DMA_TLB_DSI_FLUSH, | |
666 | non_present_entry_flush); | |
667 | } | |
668 | ||
ba395927 KA |
669 | static int iommu_flush_iotlb_psi(struct intel_iommu *iommu, u16 did, |
670 | u64 addr, unsigned int pages, int non_present_entry_flush) | |
671 | { | |
f76aec76 | 672 | unsigned int mask; |
ba395927 KA |
673 | |
674 | BUG_ON(addr & (~PAGE_MASK_4K)); | |
675 | BUG_ON(pages == 0); | |
676 | ||
677 | /* Fallback to domain selective flush if no PSI support */ | |
678 | if (!cap_pgsel_inv(iommu->cap)) | |
679 | return iommu_flush_iotlb_dsi(iommu, did, | |
680 | non_present_entry_flush); | |
681 | ||
682 | /* | |
683 | * PSI requires page size to be 2 ^ x, and the base address is naturally | |
684 | * aligned to the size | |
685 | */ | |
f76aec76 | 686 | mask = ilog2(__roundup_pow_of_two(pages)); |
ba395927 | 687 | /* Fallback to domain selective flush if size is too big */ |
f76aec76 | 688 | if (mask > cap_max_amask_val(iommu->cap)) |
ba395927 KA |
689 | return iommu_flush_iotlb_dsi(iommu, did, |
690 | non_present_entry_flush); | |
691 | ||
f76aec76 | 692 | return __iommu_flush_iotlb(iommu, did, addr, mask, |
ba395927 KA |
693 | DMA_TLB_PSI_FLUSH, non_present_entry_flush); |
694 | } | |
695 | ||
f8bab735 | 696 | static void iommu_disable_protect_mem_regions(struct intel_iommu *iommu) |
697 | { | |
698 | u32 pmen; | |
699 | unsigned long flags; | |
700 | ||
701 | spin_lock_irqsave(&iommu->register_lock, flags); | |
702 | pmen = readl(iommu->reg + DMAR_PMEN_REG); | |
703 | pmen &= ~DMA_PMEN_EPM; | |
704 | writel(pmen, iommu->reg + DMAR_PMEN_REG); | |
705 | ||
706 | /* wait for the protected region status bit to clear */ | |
707 | IOMMU_WAIT_OP(iommu, DMAR_PMEN_REG, | |
708 | readl, !(pmen & DMA_PMEN_PRS), pmen); | |
709 | ||
710 | spin_unlock_irqrestore(&iommu->register_lock, flags); | |
711 | } | |
712 | ||
ba395927 KA |
713 | static int iommu_enable_translation(struct intel_iommu *iommu) |
714 | { | |
715 | u32 sts; | |
716 | unsigned long flags; | |
717 | ||
718 | spin_lock_irqsave(&iommu->register_lock, flags); | |
719 | writel(iommu->gcmd|DMA_GCMD_TE, iommu->reg + DMAR_GCMD_REG); | |
720 | ||
721 | /* Make sure hardware complete it */ | |
722 | IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, | |
723 | readl, (sts & DMA_GSTS_TES), sts); | |
724 | ||
725 | iommu->gcmd |= DMA_GCMD_TE; | |
726 | spin_unlock_irqrestore(&iommu->register_lock, flags); | |
727 | return 0; | |
728 | } | |
729 | ||
730 | static int iommu_disable_translation(struct intel_iommu *iommu) | |
731 | { | |
732 | u32 sts; | |
733 | unsigned long flag; | |
734 | ||
735 | spin_lock_irqsave(&iommu->register_lock, flag); | |
736 | iommu->gcmd &= ~DMA_GCMD_TE; | |
737 | writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); | |
738 | ||
739 | /* Make sure hardware complete it */ | |
740 | IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, | |
741 | readl, (!(sts & DMA_GSTS_TES)), sts); | |
742 | ||
743 | spin_unlock_irqrestore(&iommu->register_lock, flag); | |
744 | return 0; | |
745 | } | |
746 | ||
3460a6d9 KA |
747 | /* iommu interrupt handling. Most stuff are MSI-like. */ |
748 | ||
d94afc6c | 749 | static const char *fault_reason_strings[] = |
3460a6d9 KA |
750 | { |
751 | "Software", | |
752 | "Present bit in root entry is clear", | |
753 | "Present bit in context entry is clear", | |
754 | "Invalid context entry", | |
755 | "Access beyond MGAW", | |
756 | "PTE Write access is not set", | |
757 | "PTE Read access is not set", | |
758 | "Next page table ptr is invalid", | |
759 | "Root table address invalid", | |
760 | "Context table ptr is invalid", | |
761 | "non-zero reserved fields in RTP", | |
762 | "non-zero reserved fields in CTP", | |
763 | "non-zero reserved fields in PTE", | |
3460a6d9 | 764 | }; |
f8bab735 | 765 | #define MAX_FAULT_REASON_IDX (ARRAY_SIZE(fault_reason_strings) - 1) |
3460a6d9 | 766 | |
d94afc6c | 767 | const char *dmar_get_fault_reason(u8 fault_reason) |
3460a6d9 | 768 | { |
d94afc6c | 769 | if (fault_reason > MAX_FAULT_REASON_IDX) |
770 | return "Unknown"; | |
3460a6d9 KA |
771 | else |
772 | return fault_reason_strings[fault_reason]; | |
773 | } | |
774 | ||
775 | void dmar_msi_unmask(unsigned int irq) | |
776 | { | |
777 | struct intel_iommu *iommu = get_irq_data(irq); | |
778 | unsigned long flag; | |
779 | ||
780 | /* unmask it */ | |
781 | spin_lock_irqsave(&iommu->register_lock, flag); | |
782 | writel(0, iommu->reg + DMAR_FECTL_REG); | |
783 | /* Read a reg to force flush the post write */ | |
784 | readl(iommu->reg + DMAR_FECTL_REG); | |
785 | spin_unlock_irqrestore(&iommu->register_lock, flag); | |
786 | } | |
787 | ||
788 | void dmar_msi_mask(unsigned int irq) | |
789 | { | |
790 | unsigned long flag; | |
791 | struct intel_iommu *iommu = get_irq_data(irq); | |
792 | ||
793 | /* mask it */ | |
794 | spin_lock_irqsave(&iommu->register_lock, flag); | |
795 | writel(DMA_FECTL_IM, iommu->reg + DMAR_FECTL_REG); | |
796 | /* Read a reg to force flush the post write */ | |
797 | readl(iommu->reg + DMAR_FECTL_REG); | |
798 | spin_unlock_irqrestore(&iommu->register_lock, flag); | |
799 | } | |
800 | ||
801 | void dmar_msi_write(int irq, struct msi_msg *msg) | |
802 | { | |
803 | struct intel_iommu *iommu = get_irq_data(irq); | |
804 | unsigned long flag; | |
805 | ||
806 | spin_lock_irqsave(&iommu->register_lock, flag); | |
807 | writel(msg->data, iommu->reg + DMAR_FEDATA_REG); | |
808 | writel(msg->address_lo, iommu->reg + DMAR_FEADDR_REG); | |
809 | writel(msg->address_hi, iommu->reg + DMAR_FEUADDR_REG); | |
810 | spin_unlock_irqrestore(&iommu->register_lock, flag); | |
811 | } | |
812 | ||
813 | void dmar_msi_read(int irq, struct msi_msg *msg) | |
814 | { | |
815 | struct intel_iommu *iommu = get_irq_data(irq); | |
816 | unsigned long flag; | |
817 | ||
818 | spin_lock_irqsave(&iommu->register_lock, flag); | |
819 | msg->data = readl(iommu->reg + DMAR_FEDATA_REG); | |
820 | msg->address_lo = readl(iommu->reg + DMAR_FEADDR_REG); | |
821 | msg->address_hi = readl(iommu->reg + DMAR_FEUADDR_REG); | |
822 | spin_unlock_irqrestore(&iommu->register_lock, flag); | |
823 | } | |
824 | ||
825 | static int iommu_page_fault_do_one(struct intel_iommu *iommu, int type, | |
826 | u8 fault_reason, u16 source_id, u64 addr) | |
827 | { | |
d94afc6c | 828 | const char *reason; |
3460a6d9 KA |
829 | |
830 | reason = dmar_get_fault_reason(fault_reason); | |
831 | ||
832 | printk(KERN_ERR | |
833 | "DMAR:[%s] Request device [%02x:%02x.%d] " | |
834 | "fault addr %llx \n" | |
835 | "DMAR:[fault reason %02d] %s\n", | |
836 | (type ? "DMA Read" : "DMA Write"), | |
837 | (source_id >> 8), PCI_SLOT(source_id & 0xFF), | |
838 | PCI_FUNC(source_id & 0xFF), addr, fault_reason, reason); | |
839 | return 0; | |
840 | } | |
841 | ||
842 | #define PRIMARY_FAULT_REG_LEN (16) | |
843 | static irqreturn_t iommu_page_fault(int irq, void *dev_id) | |
844 | { | |
845 | struct intel_iommu *iommu = dev_id; | |
846 | int reg, fault_index; | |
847 | u32 fault_status; | |
848 | unsigned long flag; | |
849 | ||
850 | spin_lock_irqsave(&iommu->register_lock, flag); | |
851 | fault_status = readl(iommu->reg + DMAR_FSTS_REG); | |
852 | ||
853 | /* TBD: ignore advanced fault log currently */ | |
854 | if (!(fault_status & DMA_FSTS_PPF)) | |
855 | goto clear_overflow; | |
856 | ||
857 | fault_index = dma_fsts_fault_record_index(fault_status); | |
858 | reg = cap_fault_reg_offset(iommu->cap); | |
859 | while (1) { | |
860 | u8 fault_reason; | |
861 | u16 source_id; | |
862 | u64 guest_addr; | |
863 | int type; | |
864 | u32 data; | |
865 | ||
866 | /* highest 32 bits */ | |
867 | data = readl(iommu->reg + reg + | |
868 | fault_index * PRIMARY_FAULT_REG_LEN + 12); | |
869 | if (!(data & DMA_FRCD_F)) | |
870 | break; | |
871 | ||
872 | fault_reason = dma_frcd_fault_reason(data); | |
873 | type = dma_frcd_type(data); | |
874 | ||
875 | data = readl(iommu->reg + reg + | |
876 | fault_index * PRIMARY_FAULT_REG_LEN + 8); | |
877 | source_id = dma_frcd_source_id(data); | |
878 | ||
879 | guest_addr = dmar_readq(iommu->reg + reg + | |
880 | fault_index * PRIMARY_FAULT_REG_LEN); | |
881 | guest_addr = dma_frcd_page_addr(guest_addr); | |
882 | /* clear the fault */ | |
883 | writel(DMA_FRCD_F, iommu->reg + reg + | |
884 | fault_index * PRIMARY_FAULT_REG_LEN + 12); | |
885 | ||
886 | spin_unlock_irqrestore(&iommu->register_lock, flag); | |
887 | ||
888 | iommu_page_fault_do_one(iommu, type, fault_reason, | |
889 | source_id, guest_addr); | |
890 | ||
891 | fault_index++; | |
892 | if (fault_index > cap_num_fault_regs(iommu->cap)) | |
893 | fault_index = 0; | |
894 | spin_lock_irqsave(&iommu->register_lock, flag); | |
895 | } | |
896 | clear_overflow: | |
897 | /* clear primary fault overflow */ | |
898 | fault_status = readl(iommu->reg + DMAR_FSTS_REG); | |
899 | if (fault_status & DMA_FSTS_PFO) | |
900 | writel(DMA_FSTS_PFO, iommu->reg + DMAR_FSTS_REG); | |
901 | ||
902 | spin_unlock_irqrestore(&iommu->register_lock, flag); | |
903 | return IRQ_HANDLED; | |
904 | } | |
905 | ||
906 | int dmar_set_interrupt(struct intel_iommu *iommu) | |
907 | { | |
908 | int irq, ret; | |
909 | ||
910 | irq = create_irq(); | |
911 | if (!irq) { | |
912 | printk(KERN_ERR "IOMMU: no free vectors\n"); | |
913 | return -EINVAL; | |
914 | } | |
915 | ||
916 | set_irq_data(irq, iommu); | |
917 | iommu->irq = irq; | |
918 | ||
919 | ret = arch_setup_dmar_msi(irq); | |
920 | if (ret) { | |
921 | set_irq_data(irq, NULL); | |
922 | iommu->irq = 0; | |
923 | destroy_irq(irq); | |
924 | return 0; | |
925 | } | |
926 | ||
927 | /* Force fault register is cleared */ | |
928 | iommu_page_fault(irq, iommu); | |
929 | ||
930 | ret = request_irq(irq, iommu_page_fault, 0, iommu->name, iommu); | |
931 | if (ret) | |
932 | printk(KERN_ERR "IOMMU: can't request irq\n"); | |
933 | return ret; | |
934 | } | |
935 | ||
ba395927 KA |
936 | static int iommu_init_domains(struct intel_iommu *iommu) |
937 | { | |
938 | unsigned long ndomains; | |
939 | unsigned long nlongs; | |
940 | ||
941 | ndomains = cap_ndoms(iommu->cap); | |
942 | pr_debug("Number of Domains supportd <%ld>\n", ndomains); | |
943 | nlongs = BITS_TO_LONGS(ndomains); | |
944 | ||
945 | /* TBD: there might be 64K domains, | |
946 | * consider other allocation for future chip | |
947 | */ | |
948 | iommu->domain_ids = kcalloc(nlongs, sizeof(unsigned long), GFP_KERNEL); | |
949 | if (!iommu->domain_ids) { | |
950 | printk(KERN_ERR "Allocating domain id array failed\n"); | |
951 | return -ENOMEM; | |
952 | } | |
953 | iommu->domains = kcalloc(ndomains, sizeof(struct dmar_domain *), | |
954 | GFP_KERNEL); | |
955 | if (!iommu->domains) { | |
956 | printk(KERN_ERR "Allocating domain array failed\n"); | |
957 | kfree(iommu->domain_ids); | |
958 | return -ENOMEM; | |
959 | } | |
960 | ||
961 | /* | |
962 | * if Caching mode is set, then invalid translations are tagged | |
963 | * with domainid 0. Hence we need to pre-allocate it. | |
964 | */ | |
965 | if (cap_caching_mode(iommu->cap)) | |
966 | set_bit(0, iommu->domain_ids); | |
967 | return 0; | |
968 | } | |
969 | ||
970 | static struct intel_iommu *alloc_iommu(struct dmar_drhd_unit *drhd) | |
971 | { | |
972 | struct intel_iommu *iommu; | |
973 | int ret; | |
974 | int map_size; | |
975 | u32 ver; | |
976 | ||
977 | iommu = kzalloc(sizeof(*iommu), GFP_KERNEL); | |
978 | if (!iommu) | |
979 | return NULL; | |
980 | iommu->reg = ioremap(drhd->reg_base_addr, PAGE_SIZE_4K); | |
981 | if (!iommu->reg) { | |
982 | printk(KERN_ERR "IOMMU: can't map the region\n"); | |
983 | goto error; | |
984 | } | |
985 | iommu->cap = dmar_readq(iommu->reg + DMAR_CAP_REG); | |
986 | iommu->ecap = dmar_readq(iommu->reg + DMAR_ECAP_REG); | |
987 | ||
988 | /* the registers might be more than one page */ | |
989 | map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap), | |
990 | cap_max_fault_reg_offset(iommu->cap)); | |
991 | map_size = PAGE_ALIGN_4K(map_size); | |
992 | if (map_size > PAGE_SIZE_4K) { | |
993 | iounmap(iommu->reg); | |
994 | iommu->reg = ioremap(drhd->reg_base_addr, map_size); | |
995 | if (!iommu->reg) { | |
996 | printk(KERN_ERR "IOMMU: can't map the region\n"); | |
997 | goto error; | |
998 | } | |
999 | } | |
1000 | ||
1001 | ver = readl(iommu->reg + DMAR_VER_REG); | |
1002 | pr_debug("IOMMU %llx: ver %d:%d cap %llx ecap %llx\n", | |
1003 | drhd->reg_base_addr, DMAR_VER_MAJOR(ver), DMAR_VER_MINOR(ver), | |
1004 | iommu->cap, iommu->ecap); | |
1005 | ret = iommu_init_domains(iommu); | |
1006 | if (ret) | |
1007 | goto error_unmap; | |
1008 | spin_lock_init(&iommu->lock); | |
1009 | spin_lock_init(&iommu->register_lock); | |
1010 | ||
1011 | drhd->iommu = iommu; | |
1012 | return iommu; | |
1013 | error_unmap: | |
1014 | iounmap(iommu->reg); | |
ba395927 KA |
1015 | error: |
1016 | kfree(iommu); | |
1017 | return NULL; | |
1018 | } | |
1019 | ||
1020 | static void domain_exit(struct dmar_domain *domain); | |
1021 | static void free_iommu(struct intel_iommu *iommu) | |
1022 | { | |
1023 | struct dmar_domain *domain; | |
1024 | int i; | |
1025 | ||
1026 | if (!iommu) | |
1027 | return; | |
1028 | ||
1029 | i = find_first_bit(iommu->domain_ids, cap_ndoms(iommu->cap)); | |
1030 | for (; i < cap_ndoms(iommu->cap); ) { | |
1031 | domain = iommu->domains[i]; | |
1032 | clear_bit(i, iommu->domain_ids); | |
1033 | domain_exit(domain); | |
1034 | i = find_next_bit(iommu->domain_ids, | |
1035 | cap_ndoms(iommu->cap), i+1); | |
1036 | } | |
1037 | ||
1038 | if (iommu->gcmd & DMA_GCMD_TE) | |
1039 | iommu_disable_translation(iommu); | |
1040 | ||
1041 | if (iommu->irq) { | |
1042 | set_irq_data(iommu->irq, NULL); | |
1043 | /* This will mask the irq */ | |
1044 | free_irq(iommu->irq, iommu); | |
1045 | destroy_irq(iommu->irq); | |
1046 | } | |
1047 | ||
1048 | kfree(iommu->domains); | |
1049 | kfree(iommu->domain_ids); | |
1050 | ||
1051 | /* free context mapping */ | |
1052 | free_context_table(iommu); | |
1053 | ||
1054 | if (iommu->reg) | |
1055 | iounmap(iommu->reg); | |
1056 | kfree(iommu); | |
1057 | } | |
1058 | ||
1059 | static struct dmar_domain * iommu_alloc_domain(struct intel_iommu *iommu) | |
1060 | { | |
1061 | unsigned long num; | |
1062 | unsigned long ndomains; | |
1063 | struct dmar_domain *domain; | |
1064 | unsigned long flags; | |
1065 | ||
1066 | domain = alloc_domain_mem(); | |
1067 | if (!domain) | |
1068 | return NULL; | |
1069 | ||
1070 | ndomains = cap_ndoms(iommu->cap); | |
1071 | ||
1072 | spin_lock_irqsave(&iommu->lock, flags); | |
1073 | num = find_first_zero_bit(iommu->domain_ids, ndomains); | |
1074 | if (num >= ndomains) { | |
1075 | spin_unlock_irqrestore(&iommu->lock, flags); | |
1076 | free_domain_mem(domain); | |
1077 | printk(KERN_ERR "IOMMU: no free domain ids\n"); | |
1078 | return NULL; | |
1079 | } | |
1080 | ||
1081 | set_bit(num, iommu->domain_ids); | |
1082 | domain->id = num; | |
1083 | domain->iommu = iommu; | |
1084 | iommu->domains[num] = domain; | |
1085 | spin_unlock_irqrestore(&iommu->lock, flags); | |
1086 | ||
1087 | return domain; | |
1088 | } | |
1089 | ||
1090 | static void iommu_free_domain(struct dmar_domain *domain) | |
1091 | { | |
1092 | unsigned long flags; | |
1093 | ||
1094 | spin_lock_irqsave(&domain->iommu->lock, flags); | |
1095 | clear_bit(domain->id, domain->iommu->domain_ids); | |
1096 | spin_unlock_irqrestore(&domain->iommu->lock, flags); | |
1097 | } | |
1098 | ||
1099 | static struct iova_domain reserved_iova_list; | |
1100 | ||
1101 | static void dmar_init_reserved_ranges(void) | |
1102 | { | |
1103 | struct pci_dev *pdev = NULL; | |
1104 | struct iova *iova; | |
1105 | int i; | |
1106 | u64 addr, size; | |
1107 | ||
f661197e | 1108 | init_iova_domain(&reserved_iova_list, DMA_32BIT_PFN); |
ba395927 KA |
1109 | |
1110 | /* IOAPIC ranges shouldn't be accessed by DMA */ | |
1111 | iova = reserve_iova(&reserved_iova_list, IOVA_PFN(IOAPIC_RANGE_START), | |
1112 | IOVA_PFN(IOAPIC_RANGE_END)); | |
1113 | if (!iova) | |
1114 | printk(KERN_ERR "Reserve IOAPIC range failed\n"); | |
1115 | ||
1116 | /* Reserve all PCI MMIO to avoid peer-to-peer access */ | |
1117 | for_each_pci_dev(pdev) { | |
1118 | struct resource *r; | |
1119 | ||
1120 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { | |
1121 | r = &pdev->resource[i]; | |
1122 | if (!r->flags || !(r->flags & IORESOURCE_MEM)) | |
1123 | continue; | |
1124 | addr = r->start; | |
1125 | addr &= PAGE_MASK_4K; | |
1126 | size = r->end - addr; | |
1127 | size = PAGE_ALIGN_4K(size); | |
1128 | iova = reserve_iova(&reserved_iova_list, IOVA_PFN(addr), | |
1129 | IOVA_PFN(size + addr) - 1); | |
1130 | if (!iova) | |
1131 | printk(KERN_ERR "Reserve iova failed\n"); | |
1132 | } | |
1133 | } | |
1134 | ||
1135 | } | |
1136 | ||
1137 | static void domain_reserve_special_ranges(struct dmar_domain *domain) | |
1138 | { | |
1139 | copy_reserved_iova(&reserved_iova_list, &domain->iovad); | |
1140 | } | |
1141 | ||
1142 | static inline int guestwidth_to_adjustwidth(int gaw) | |
1143 | { | |
1144 | int agaw; | |
1145 | int r = (gaw - 12) % 9; | |
1146 | ||
1147 | if (r == 0) | |
1148 | agaw = gaw; | |
1149 | else | |
1150 | agaw = gaw + 9 - r; | |
1151 | if (agaw > 64) | |
1152 | agaw = 64; | |
1153 | return agaw; | |
1154 | } | |
1155 | ||
1156 | static int domain_init(struct dmar_domain *domain, int guest_width) | |
1157 | { | |
1158 | struct intel_iommu *iommu; | |
1159 | int adjust_width, agaw; | |
1160 | unsigned long sagaw; | |
1161 | ||
f661197e | 1162 | init_iova_domain(&domain->iovad, DMA_32BIT_PFN); |
ba395927 KA |
1163 | spin_lock_init(&domain->mapping_lock); |
1164 | ||
1165 | domain_reserve_special_ranges(domain); | |
1166 | ||
1167 | /* calculate AGAW */ | |
1168 | iommu = domain->iommu; | |
1169 | if (guest_width > cap_mgaw(iommu->cap)) | |
1170 | guest_width = cap_mgaw(iommu->cap); | |
1171 | domain->gaw = guest_width; | |
1172 | adjust_width = guestwidth_to_adjustwidth(guest_width); | |
1173 | agaw = width_to_agaw(adjust_width); | |
1174 | sagaw = cap_sagaw(iommu->cap); | |
1175 | if (!test_bit(agaw, &sagaw)) { | |
1176 | /* hardware doesn't support it, choose a bigger one */ | |
1177 | pr_debug("IOMMU: hardware doesn't support agaw %d\n", agaw); | |
1178 | agaw = find_next_bit(&sagaw, 5, agaw); | |
1179 | if (agaw >= 5) | |
1180 | return -ENODEV; | |
1181 | } | |
1182 | domain->agaw = agaw; | |
1183 | INIT_LIST_HEAD(&domain->devices); | |
1184 | ||
1185 | /* always allocate the top pgd */ | |
1186 | domain->pgd = (struct dma_pte *)alloc_pgtable_page(); | |
1187 | if (!domain->pgd) | |
1188 | return -ENOMEM; | |
1189 | __iommu_flush_cache(iommu, domain->pgd, PAGE_SIZE_4K); | |
1190 | return 0; | |
1191 | } | |
1192 | ||
1193 | static void domain_exit(struct dmar_domain *domain) | |
1194 | { | |
1195 | u64 end; | |
1196 | ||
1197 | /* Domain 0 is reserved, so dont process it */ | |
1198 | if (!domain) | |
1199 | return; | |
1200 | ||
1201 | domain_remove_dev_info(domain); | |
1202 | /* destroy iovas */ | |
1203 | put_iova_domain(&domain->iovad); | |
1204 | end = DOMAIN_MAX_ADDR(domain->gaw); | |
1205 | end = end & (~PAGE_MASK_4K); | |
1206 | ||
1207 | /* clear ptes */ | |
1208 | dma_pte_clear_range(domain, 0, end); | |
1209 | ||
1210 | /* free page tables */ | |
1211 | dma_pte_free_pagetable(domain, 0, end); | |
1212 | ||
1213 | iommu_free_domain(domain); | |
1214 | free_domain_mem(domain); | |
1215 | } | |
1216 | ||
1217 | static int domain_context_mapping_one(struct dmar_domain *domain, | |
1218 | u8 bus, u8 devfn) | |
1219 | { | |
1220 | struct context_entry *context; | |
1221 | struct intel_iommu *iommu = domain->iommu; | |
1222 | unsigned long flags; | |
1223 | ||
1224 | pr_debug("Set context mapping for %02x:%02x.%d\n", | |
1225 | bus, PCI_SLOT(devfn), PCI_FUNC(devfn)); | |
1226 | BUG_ON(!domain->pgd); | |
1227 | context = device_to_context_entry(iommu, bus, devfn); | |
1228 | if (!context) | |
1229 | return -ENOMEM; | |
1230 | spin_lock_irqsave(&iommu->lock, flags); | |
1231 | if (context_present(*context)) { | |
1232 | spin_unlock_irqrestore(&iommu->lock, flags); | |
1233 | return 0; | |
1234 | } | |
1235 | ||
1236 | context_set_domain_id(*context, domain->id); | |
1237 | context_set_address_width(*context, domain->agaw); | |
1238 | context_set_address_root(*context, virt_to_phys(domain->pgd)); | |
1239 | context_set_translation_type(*context, CONTEXT_TT_MULTI_LEVEL); | |
1240 | context_set_fault_enable(*context); | |
1241 | context_set_present(*context); | |
1242 | __iommu_flush_cache(iommu, context, sizeof(*context)); | |
1243 | ||
1244 | /* it's a non-present to present mapping */ | |
1245 | if (iommu_flush_context_device(iommu, domain->id, | |
1246 | (((u16)bus) << 8) | devfn, DMA_CCMD_MASK_NOBIT, 1)) | |
1247 | iommu_flush_write_buffer(iommu); | |
1248 | else | |
1249 | iommu_flush_iotlb_dsi(iommu, 0, 0); | |
1250 | spin_unlock_irqrestore(&iommu->lock, flags); | |
1251 | return 0; | |
1252 | } | |
1253 | ||
1254 | static int | |
1255 | domain_context_mapping(struct dmar_domain *domain, struct pci_dev *pdev) | |
1256 | { | |
1257 | int ret; | |
1258 | struct pci_dev *tmp, *parent; | |
1259 | ||
1260 | ret = domain_context_mapping_one(domain, pdev->bus->number, | |
1261 | pdev->devfn); | |
1262 | if (ret) | |
1263 | return ret; | |
1264 | ||
1265 | /* dependent device mapping */ | |
1266 | tmp = pci_find_upstream_pcie_bridge(pdev); | |
1267 | if (!tmp) | |
1268 | return 0; | |
1269 | /* Secondary interface's bus number and devfn 0 */ | |
1270 | parent = pdev->bus->self; | |
1271 | while (parent != tmp) { | |
1272 | ret = domain_context_mapping_one(domain, parent->bus->number, | |
1273 | parent->devfn); | |
1274 | if (ret) | |
1275 | return ret; | |
1276 | parent = parent->bus->self; | |
1277 | } | |
1278 | if (tmp->is_pcie) /* this is a PCIE-to-PCI bridge */ | |
1279 | return domain_context_mapping_one(domain, | |
1280 | tmp->subordinate->number, 0); | |
1281 | else /* this is a legacy PCI bridge */ | |
1282 | return domain_context_mapping_one(domain, | |
1283 | tmp->bus->number, tmp->devfn); | |
1284 | } | |
1285 | ||
1286 | static int domain_context_mapped(struct dmar_domain *domain, | |
1287 | struct pci_dev *pdev) | |
1288 | { | |
1289 | int ret; | |
1290 | struct pci_dev *tmp, *parent; | |
1291 | ||
1292 | ret = device_context_mapped(domain->iommu, | |
1293 | pdev->bus->number, pdev->devfn); | |
1294 | if (!ret) | |
1295 | return ret; | |
1296 | /* dependent device mapping */ | |
1297 | tmp = pci_find_upstream_pcie_bridge(pdev); | |
1298 | if (!tmp) | |
1299 | return ret; | |
1300 | /* Secondary interface's bus number and devfn 0 */ | |
1301 | parent = pdev->bus->self; | |
1302 | while (parent != tmp) { | |
1303 | ret = device_context_mapped(domain->iommu, parent->bus->number, | |
1304 | parent->devfn); | |
1305 | if (!ret) | |
1306 | return ret; | |
1307 | parent = parent->bus->self; | |
1308 | } | |
1309 | if (tmp->is_pcie) | |
1310 | return device_context_mapped(domain->iommu, | |
1311 | tmp->subordinate->number, 0); | |
1312 | else | |
1313 | return device_context_mapped(domain->iommu, | |
1314 | tmp->bus->number, tmp->devfn); | |
1315 | } | |
1316 | ||
1317 | static int | |
1318 | domain_page_mapping(struct dmar_domain *domain, dma_addr_t iova, | |
1319 | u64 hpa, size_t size, int prot) | |
1320 | { | |
1321 | u64 start_pfn, end_pfn; | |
1322 | struct dma_pte *pte; | |
1323 | int index; | |
1324 | ||
1325 | if ((prot & (DMA_PTE_READ|DMA_PTE_WRITE)) == 0) | |
1326 | return -EINVAL; | |
1327 | iova &= PAGE_MASK_4K; | |
1328 | start_pfn = ((u64)hpa) >> PAGE_SHIFT_4K; | |
1329 | end_pfn = (PAGE_ALIGN_4K(((u64)hpa) + size)) >> PAGE_SHIFT_4K; | |
1330 | index = 0; | |
1331 | while (start_pfn < end_pfn) { | |
1332 | pte = addr_to_dma_pte(domain, iova + PAGE_SIZE_4K * index); | |
1333 | if (!pte) | |
1334 | return -ENOMEM; | |
1335 | /* We don't need lock here, nobody else | |
1336 | * touches the iova range | |
1337 | */ | |
1338 | BUG_ON(dma_pte_addr(*pte)); | |
1339 | dma_set_pte_addr(*pte, start_pfn << PAGE_SHIFT_4K); | |
1340 | dma_set_pte_prot(*pte, prot); | |
1341 | __iommu_flush_cache(domain->iommu, pte, sizeof(*pte)); | |
1342 | start_pfn++; | |
1343 | index++; | |
1344 | } | |
1345 | return 0; | |
1346 | } | |
1347 | ||
1348 | static void detach_domain_for_dev(struct dmar_domain *domain, u8 bus, u8 devfn) | |
1349 | { | |
1350 | clear_context_table(domain->iommu, bus, devfn); | |
1351 | iommu_flush_context_global(domain->iommu, 0); | |
1352 | iommu_flush_iotlb_global(domain->iommu, 0); | |
1353 | } | |
1354 | ||
1355 | static void domain_remove_dev_info(struct dmar_domain *domain) | |
1356 | { | |
1357 | struct device_domain_info *info; | |
1358 | unsigned long flags; | |
1359 | ||
1360 | spin_lock_irqsave(&device_domain_lock, flags); | |
1361 | while (!list_empty(&domain->devices)) { | |
1362 | info = list_entry(domain->devices.next, | |
1363 | struct device_domain_info, link); | |
1364 | list_del(&info->link); | |
1365 | list_del(&info->global); | |
1366 | if (info->dev) | |
358dd8ac | 1367 | info->dev->dev.archdata.iommu = NULL; |
ba395927 KA |
1368 | spin_unlock_irqrestore(&device_domain_lock, flags); |
1369 | ||
1370 | detach_domain_for_dev(info->domain, info->bus, info->devfn); | |
1371 | free_devinfo_mem(info); | |
1372 | ||
1373 | spin_lock_irqsave(&device_domain_lock, flags); | |
1374 | } | |
1375 | spin_unlock_irqrestore(&device_domain_lock, flags); | |
1376 | } | |
1377 | ||
1378 | /* | |
1379 | * find_domain | |
358dd8ac | 1380 | * Note: we use struct pci_dev->dev.archdata.iommu stores the info |
ba395927 KA |
1381 | */ |
1382 | struct dmar_domain * | |
1383 | find_domain(struct pci_dev *pdev) | |
1384 | { | |
1385 | struct device_domain_info *info; | |
1386 | ||
1387 | /* No lock here, assumes no domain exit in normal case */ | |
358dd8ac | 1388 | info = pdev->dev.archdata.iommu; |
ba395927 KA |
1389 | if (info) |
1390 | return info->domain; | |
1391 | return NULL; | |
1392 | } | |
1393 | ||
1394 | static int dmar_pci_device_match(struct pci_dev *devices[], int cnt, | |
1395 | struct pci_dev *dev) | |
1396 | { | |
1397 | int index; | |
1398 | ||
1399 | while (dev) { | |
1400 | for (index = 0; index < cnt; index ++) | |
1401 | if (dev == devices[index]) | |
1402 | return 1; | |
1403 | ||
1404 | /* Check our parent */ | |
1405 | dev = dev->bus->self; | |
1406 | } | |
1407 | ||
1408 | return 0; | |
1409 | } | |
1410 | ||
1411 | static struct dmar_drhd_unit * | |
1412 | dmar_find_matched_drhd_unit(struct pci_dev *dev) | |
1413 | { | |
1414 | struct dmar_drhd_unit *drhd = NULL; | |
1415 | ||
1416 | list_for_each_entry(drhd, &dmar_drhd_units, list) { | |
1417 | if (drhd->include_all || dmar_pci_device_match(drhd->devices, | |
1418 | drhd->devices_cnt, dev)) | |
1419 | return drhd; | |
1420 | } | |
1421 | ||
1422 | return NULL; | |
1423 | } | |
1424 | ||
1425 | /* domain is initialized */ | |
1426 | static struct dmar_domain *get_domain_for_dev(struct pci_dev *pdev, int gaw) | |
1427 | { | |
1428 | struct dmar_domain *domain, *found = NULL; | |
1429 | struct intel_iommu *iommu; | |
1430 | struct dmar_drhd_unit *drhd; | |
1431 | struct device_domain_info *info, *tmp; | |
1432 | struct pci_dev *dev_tmp; | |
1433 | unsigned long flags; | |
1434 | int bus = 0, devfn = 0; | |
1435 | ||
1436 | domain = find_domain(pdev); | |
1437 | if (domain) | |
1438 | return domain; | |
1439 | ||
1440 | dev_tmp = pci_find_upstream_pcie_bridge(pdev); | |
1441 | if (dev_tmp) { | |
1442 | if (dev_tmp->is_pcie) { | |
1443 | bus = dev_tmp->subordinate->number; | |
1444 | devfn = 0; | |
1445 | } else { | |
1446 | bus = dev_tmp->bus->number; | |
1447 | devfn = dev_tmp->devfn; | |
1448 | } | |
1449 | spin_lock_irqsave(&device_domain_lock, flags); | |
1450 | list_for_each_entry(info, &device_domain_list, global) { | |
1451 | if (info->bus == bus && info->devfn == devfn) { | |
1452 | found = info->domain; | |
1453 | break; | |
1454 | } | |
1455 | } | |
1456 | spin_unlock_irqrestore(&device_domain_lock, flags); | |
1457 | /* pcie-pci bridge already has a domain, uses it */ | |
1458 | if (found) { | |
1459 | domain = found; | |
1460 | goto found_domain; | |
1461 | } | |
1462 | } | |
1463 | ||
1464 | /* Allocate new domain for the device */ | |
1465 | drhd = dmar_find_matched_drhd_unit(pdev); | |
1466 | if (!drhd) { | |
1467 | printk(KERN_ERR "IOMMU: can't find DMAR for device %s\n", | |
1468 | pci_name(pdev)); | |
1469 | return NULL; | |
1470 | } | |
1471 | iommu = drhd->iommu; | |
1472 | ||
1473 | domain = iommu_alloc_domain(iommu); | |
1474 | if (!domain) | |
1475 | goto error; | |
1476 | ||
1477 | if (domain_init(domain, gaw)) { | |
1478 | domain_exit(domain); | |
1479 | goto error; | |
1480 | } | |
1481 | ||
1482 | /* register pcie-to-pci device */ | |
1483 | if (dev_tmp) { | |
1484 | info = alloc_devinfo_mem(); | |
1485 | if (!info) { | |
1486 | domain_exit(domain); | |
1487 | goto error; | |
1488 | } | |
1489 | info->bus = bus; | |
1490 | info->devfn = devfn; | |
1491 | info->dev = NULL; | |
1492 | info->domain = domain; | |
1493 | /* This domain is shared by devices under p2p bridge */ | |
1494 | domain->flags |= DOMAIN_FLAG_MULTIPLE_DEVICES; | |
1495 | ||
1496 | /* pcie-to-pci bridge already has a domain, uses it */ | |
1497 | found = NULL; | |
1498 | spin_lock_irqsave(&device_domain_lock, flags); | |
1499 | list_for_each_entry(tmp, &device_domain_list, global) { | |
1500 | if (tmp->bus == bus && tmp->devfn == devfn) { | |
1501 | found = tmp->domain; | |
1502 | break; | |
1503 | } | |
1504 | } | |
1505 | if (found) { | |
1506 | free_devinfo_mem(info); | |
1507 | domain_exit(domain); | |
1508 | domain = found; | |
1509 | } else { | |
1510 | list_add(&info->link, &domain->devices); | |
1511 | list_add(&info->global, &device_domain_list); | |
1512 | } | |
1513 | spin_unlock_irqrestore(&device_domain_lock, flags); | |
1514 | } | |
1515 | ||
1516 | found_domain: | |
1517 | info = alloc_devinfo_mem(); | |
1518 | if (!info) | |
1519 | goto error; | |
1520 | info->bus = pdev->bus->number; | |
1521 | info->devfn = pdev->devfn; | |
1522 | info->dev = pdev; | |
1523 | info->domain = domain; | |
1524 | spin_lock_irqsave(&device_domain_lock, flags); | |
1525 | /* somebody is fast */ | |
1526 | found = find_domain(pdev); | |
1527 | if (found != NULL) { | |
1528 | spin_unlock_irqrestore(&device_domain_lock, flags); | |
1529 | if (found != domain) { | |
1530 | domain_exit(domain); | |
1531 | domain = found; | |
1532 | } | |
1533 | free_devinfo_mem(info); | |
1534 | return domain; | |
1535 | } | |
1536 | list_add(&info->link, &domain->devices); | |
1537 | list_add(&info->global, &device_domain_list); | |
358dd8ac | 1538 | pdev->dev.archdata.iommu = info; |
ba395927 KA |
1539 | spin_unlock_irqrestore(&device_domain_lock, flags); |
1540 | return domain; | |
1541 | error: | |
1542 | /* recheck it here, maybe others set it */ | |
1543 | return find_domain(pdev); | |
1544 | } | |
1545 | ||
1546 | static int iommu_prepare_identity_map(struct pci_dev *pdev, u64 start, u64 end) | |
1547 | { | |
1548 | struct dmar_domain *domain; | |
1549 | unsigned long size; | |
1550 | u64 base; | |
1551 | int ret; | |
1552 | ||
1553 | printk(KERN_INFO | |
1554 | "IOMMU: Setting identity map for device %s [0x%Lx - 0x%Lx]\n", | |
1555 | pci_name(pdev), start, end); | |
1556 | /* page table init */ | |
1557 | domain = get_domain_for_dev(pdev, DEFAULT_DOMAIN_ADDRESS_WIDTH); | |
1558 | if (!domain) | |
1559 | return -ENOMEM; | |
1560 | ||
1561 | /* The address might not be aligned */ | |
1562 | base = start & PAGE_MASK_4K; | |
1563 | size = end - base; | |
1564 | size = PAGE_ALIGN_4K(size); | |
1565 | if (!reserve_iova(&domain->iovad, IOVA_PFN(base), | |
1566 | IOVA_PFN(base + size) - 1)) { | |
1567 | printk(KERN_ERR "IOMMU: reserve iova failed\n"); | |
1568 | ret = -ENOMEM; | |
1569 | goto error; | |
1570 | } | |
1571 | ||
1572 | pr_debug("Mapping reserved region %lx@%llx for %s\n", | |
1573 | size, base, pci_name(pdev)); | |
1574 | /* | |
1575 | * RMRR range might have overlap with physical memory range, | |
1576 | * clear it first | |
1577 | */ | |
1578 | dma_pte_clear_range(domain, base, base + size); | |
1579 | ||
1580 | ret = domain_page_mapping(domain, base, base, size, | |
1581 | DMA_PTE_READ|DMA_PTE_WRITE); | |
1582 | if (ret) | |
1583 | goto error; | |
1584 | ||
1585 | /* context entry init */ | |
1586 | ret = domain_context_mapping(domain, pdev); | |
1587 | if (!ret) | |
1588 | return 0; | |
1589 | error: | |
1590 | domain_exit(domain); | |
1591 | return ret; | |
1592 | ||
1593 | } | |
1594 | ||
1595 | static inline int iommu_prepare_rmrr_dev(struct dmar_rmrr_unit *rmrr, | |
1596 | struct pci_dev *pdev) | |
1597 | { | |
358dd8ac | 1598 | if (pdev->dev.archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO) |
ba395927 KA |
1599 | return 0; |
1600 | return iommu_prepare_identity_map(pdev, rmrr->base_address, | |
1601 | rmrr->end_address + 1); | |
1602 | } | |
1603 | ||
e820482c KA |
1604 | #ifdef CONFIG_DMAR_GFX_WA |
1605 | extern int arch_get_ram_range(int slot, u64 *addr, u64 *size); | |
1606 | static void __init iommu_prepare_gfx_mapping(void) | |
1607 | { | |
1608 | struct pci_dev *pdev = NULL; | |
1609 | u64 base, size; | |
1610 | int slot; | |
1611 | int ret; | |
1612 | ||
1613 | for_each_pci_dev(pdev) { | |
358dd8ac | 1614 | if (pdev->dev.archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO || |
e820482c KA |
1615 | !IS_GFX_DEVICE(pdev)) |
1616 | continue; | |
1617 | printk(KERN_INFO "IOMMU: gfx device %s 1-1 mapping\n", | |
1618 | pci_name(pdev)); | |
1619 | slot = arch_get_ram_range(0, &base, &size); | |
1620 | while (slot >= 0) { | |
1621 | ret = iommu_prepare_identity_map(pdev, | |
1622 | base, base + size); | |
1623 | if (ret) | |
1624 | goto error; | |
1625 | slot = arch_get_ram_range(slot, &base, &size); | |
1626 | } | |
1627 | continue; | |
1628 | error: | |
1629 | printk(KERN_ERR "IOMMU: mapping reserved region failed\n"); | |
1630 | } | |
1631 | } | |
1632 | #endif | |
1633 | ||
49a0429e KA |
1634 | #ifdef CONFIG_DMAR_FLOPPY_WA |
1635 | static inline void iommu_prepare_isa(void) | |
1636 | { | |
1637 | struct pci_dev *pdev; | |
1638 | int ret; | |
1639 | ||
1640 | pdev = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, NULL); | |
1641 | if (!pdev) | |
1642 | return; | |
1643 | ||
1644 | printk(KERN_INFO "IOMMU: Prepare 0-16M unity mapping for LPC\n"); | |
1645 | ret = iommu_prepare_identity_map(pdev, 0, 16*1024*1024); | |
1646 | ||
1647 | if (ret) | |
1648 | printk("IOMMU: Failed to create 0-64M identity map, " | |
1649 | "floppy might not work\n"); | |
1650 | ||
1651 | } | |
1652 | #else | |
1653 | static inline void iommu_prepare_isa(void) | |
1654 | { | |
1655 | return; | |
1656 | } | |
1657 | #endif /* !CONFIG_DMAR_FLPY_WA */ | |
1658 | ||
ba395927 KA |
1659 | int __init init_dmars(void) |
1660 | { | |
1661 | struct dmar_drhd_unit *drhd; | |
1662 | struct dmar_rmrr_unit *rmrr; | |
1663 | struct pci_dev *pdev; | |
1664 | struct intel_iommu *iommu; | |
1665 | int ret, unit = 0; | |
1666 | ||
1667 | /* | |
1668 | * for each drhd | |
1669 | * allocate root | |
1670 | * initialize and program root entry to not present | |
1671 | * endfor | |
1672 | */ | |
1673 | for_each_drhd_unit(drhd) { | |
1674 | if (drhd->ignored) | |
1675 | continue; | |
1676 | iommu = alloc_iommu(drhd); | |
1677 | if (!iommu) { | |
1678 | ret = -ENOMEM; | |
1679 | goto error; | |
1680 | } | |
1681 | ||
1682 | /* | |
1683 | * TBD: | |
1684 | * we could share the same root & context tables | |
1685 | * amoung all IOMMU's. Need to Split it later. | |
1686 | */ | |
1687 | ret = iommu_alloc_root_entry(iommu); | |
1688 | if (ret) { | |
1689 | printk(KERN_ERR "IOMMU: allocate root entry failed\n"); | |
1690 | goto error; | |
1691 | } | |
1692 | } | |
1693 | ||
1694 | /* | |
1695 | * For each rmrr | |
1696 | * for each dev attached to rmrr | |
1697 | * do | |
1698 | * locate drhd for dev, alloc domain for dev | |
1699 | * allocate free domain | |
1700 | * allocate page table entries for rmrr | |
1701 | * if context not allocated for bus | |
1702 | * allocate and init context | |
1703 | * set present in root table for this bus | |
1704 | * init context with domain, translation etc | |
1705 | * endfor | |
1706 | * endfor | |
1707 | */ | |
1708 | for_each_rmrr_units(rmrr) { | |
1709 | int i; | |
1710 | for (i = 0; i < rmrr->devices_cnt; i++) { | |
1711 | pdev = rmrr->devices[i]; | |
1712 | /* some BIOS lists non-exist devices in DMAR table */ | |
1713 | if (!pdev) | |
1714 | continue; | |
1715 | ret = iommu_prepare_rmrr_dev(rmrr, pdev); | |
1716 | if (ret) | |
1717 | printk(KERN_ERR | |
1718 | "IOMMU: mapping reserved region failed\n"); | |
1719 | } | |
1720 | } | |
1721 | ||
e820482c KA |
1722 | iommu_prepare_gfx_mapping(); |
1723 | ||
49a0429e KA |
1724 | iommu_prepare_isa(); |
1725 | ||
ba395927 KA |
1726 | /* |
1727 | * for each drhd | |
1728 | * enable fault log | |
1729 | * global invalidate context cache | |
1730 | * global invalidate iotlb | |
1731 | * enable translation | |
1732 | */ | |
1733 | for_each_drhd_unit(drhd) { | |
1734 | if (drhd->ignored) | |
1735 | continue; | |
1736 | iommu = drhd->iommu; | |
1737 | sprintf (iommu->name, "dmar%d", unit++); | |
1738 | ||
1739 | iommu_flush_write_buffer(iommu); | |
1740 | ||
3460a6d9 KA |
1741 | ret = dmar_set_interrupt(iommu); |
1742 | if (ret) | |
1743 | goto error; | |
1744 | ||
ba395927 KA |
1745 | iommu_set_root_entry(iommu); |
1746 | ||
1747 | iommu_flush_context_global(iommu, 0); | |
1748 | iommu_flush_iotlb_global(iommu, 0); | |
1749 | ||
f8bab735 | 1750 | iommu_disable_protect_mem_regions(iommu); |
1751 | ||
ba395927 KA |
1752 | ret = iommu_enable_translation(iommu); |
1753 | if (ret) | |
1754 | goto error; | |
1755 | } | |
1756 | ||
1757 | return 0; | |
1758 | error: | |
1759 | for_each_drhd_unit(drhd) { | |
1760 | if (drhd->ignored) | |
1761 | continue; | |
1762 | iommu = drhd->iommu; | |
1763 | free_iommu(iommu); | |
1764 | } | |
1765 | return ret; | |
1766 | } | |
1767 | ||
1768 | static inline u64 aligned_size(u64 host_addr, size_t size) | |
1769 | { | |
1770 | u64 addr; | |
1771 | addr = (host_addr & (~PAGE_MASK_4K)) + size; | |
1772 | return PAGE_ALIGN_4K(addr); | |
1773 | } | |
1774 | ||
1775 | struct iova * | |
f76aec76 | 1776 | iommu_alloc_iova(struct dmar_domain *domain, size_t size, u64 end) |
ba395927 | 1777 | { |
ba395927 KA |
1778 | struct iova *piova; |
1779 | ||
1780 | /* Make sure it's in range */ | |
ba395927 | 1781 | end = min_t(u64, DOMAIN_MAX_ADDR(domain->gaw), end); |
f76aec76 | 1782 | if (!size || (IOVA_START_ADDR + size > end)) |
ba395927 KA |
1783 | return NULL; |
1784 | ||
1785 | piova = alloc_iova(&domain->iovad, | |
f76aec76 | 1786 | size >> PAGE_SHIFT_4K, IOVA_PFN(end), 1); |
ba395927 KA |
1787 | return piova; |
1788 | } | |
1789 | ||
f76aec76 KA |
1790 | static struct iova * |
1791 | __intel_alloc_iova(struct device *dev, struct dmar_domain *domain, | |
1792 | size_t size) | |
ba395927 | 1793 | { |
ba395927 | 1794 | struct pci_dev *pdev = to_pci_dev(dev); |
ba395927 | 1795 | struct iova *iova = NULL; |
ba395927 | 1796 | |
7d3b03ce | 1797 | if ((pdev->dma_mask <= DMA_32BIT_MASK) || (dmar_forcedac)) { |
f76aec76 | 1798 | iova = iommu_alloc_iova(domain, size, pdev->dma_mask); |
ba395927 KA |
1799 | } else { |
1800 | /* | |
1801 | * First try to allocate an io virtual address in | |
1802 | * DMA_32BIT_MASK and if that fails then try allocating | |
3609801e | 1803 | * from higher range |
ba395927 | 1804 | */ |
f76aec76 | 1805 | iova = iommu_alloc_iova(domain, size, DMA_32BIT_MASK); |
ba395927 | 1806 | if (!iova) |
f76aec76 | 1807 | iova = iommu_alloc_iova(domain, size, pdev->dma_mask); |
ba395927 KA |
1808 | } |
1809 | ||
1810 | if (!iova) { | |
1811 | printk(KERN_ERR"Allocating iova for %s failed", pci_name(pdev)); | |
f76aec76 KA |
1812 | return NULL; |
1813 | } | |
1814 | ||
1815 | return iova; | |
1816 | } | |
1817 | ||
1818 | static struct dmar_domain * | |
1819 | get_valid_domain_for_dev(struct pci_dev *pdev) | |
1820 | { | |
1821 | struct dmar_domain *domain; | |
1822 | int ret; | |
1823 | ||
1824 | domain = get_domain_for_dev(pdev, | |
1825 | DEFAULT_DOMAIN_ADDRESS_WIDTH); | |
1826 | if (!domain) { | |
1827 | printk(KERN_ERR | |
1828 | "Allocating domain for %s failed", pci_name(pdev)); | |
4fe05bbc | 1829 | return NULL; |
ba395927 KA |
1830 | } |
1831 | ||
1832 | /* make sure context mapping is ok */ | |
1833 | if (unlikely(!domain_context_mapped(domain, pdev))) { | |
1834 | ret = domain_context_mapping(domain, pdev); | |
f76aec76 KA |
1835 | if (ret) { |
1836 | printk(KERN_ERR | |
1837 | "Domain context map for %s failed", | |
1838 | pci_name(pdev)); | |
4fe05bbc | 1839 | return NULL; |
f76aec76 | 1840 | } |
ba395927 KA |
1841 | } |
1842 | ||
f76aec76 KA |
1843 | return domain; |
1844 | } | |
1845 | ||
1846 | static dma_addr_t intel_map_single(struct device *hwdev, void *addr, | |
1847 | size_t size, int dir) | |
1848 | { | |
1849 | struct pci_dev *pdev = to_pci_dev(hwdev); | |
1850 | int ret; | |
1851 | struct dmar_domain *domain; | |
1852 | unsigned long start_addr; | |
1853 | struct iova *iova; | |
1854 | int prot = 0; | |
1855 | ||
1856 | BUG_ON(dir == DMA_NONE); | |
358dd8ac | 1857 | if (pdev->dev.archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO) |
f76aec76 KA |
1858 | return virt_to_bus(addr); |
1859 | ||
1860 | domain = get_valid_domain_for_dev(pdev); | |
1861 | if (!domain) | |
1862 | return 0; | |
1863 | ||
1864 | addr = (void *)virt_to_phys(addr); | |
1865 | size = aligned_size((u64)addr, size); | |
1866 | ||
1867 | iova = __intel_alloc_iova(hwdev, domain, size); | |
1868 | if (!iova) | |
1869 | goto error; | |
1870 | ||
1871 | start_addr = iova->pfn_lo << PAGE_SHIFT_4K; | |
1872 | ||
ba395927 KA |
1873 | /* |
1874 | * Check if DMAR supports zero-length reads on write only | |
1875 | * mappings.. | |
1876 | */ | |
1877 | if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL || \ | |
1878 | !cap_zlr(domain->iommu->cap)) | |
1879 | prot |= DMA_PTE_READ; | |
1880 | if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) | |
1881 | prot |= DMA_PTE_WRITE; | |
1882 | /* | |
1883 | * addr - (addr + size) might be partial page, we should map the whole | |
1884 | * page. Note: if two part of one page are separately mapped, we | |
1885 | * might have two guest_addr mapping to the same host addr, but this | |
1886 | * is not a big problem | |
1887 | */ | |
f76aec76 KA |
1888 | ret = domain_page_mapping(domain, start_addr, |
1889 | ((u64)addr) & PAGE_MASK_4K, size, prot); | |
ba395927 KA |
1890 | if (ret) |
1891 | goto error; | |
1892 | ||
1893 | pr_debug("Device %s request: %lx@%llx mapping: %lx@%llx, dir %d\n", | |
1894 | pci_name(pdev), size, (u64)addr, | |
f76aec76 KA |
1895 | size, (u64)start_addr, dir); |
1896 | ||
1897 | /* it's a non-present to present mapping */ | |
1898 | ret = iommu_flush_iotlb_psi(domain->iommu, domain->id, | |
1899 | start_addr, size >> PAGE_SHIFT_4K, 1); | |
1900 | if (ret) | |
1901 | iommu_flush_write_buffer(domain->iommu); | |
1902 | ||
1903 | return (start_addr + ((u64)addr & (~PAGE_MASK_4K))); | |
ba395927 | 1904 | |
ba395927 | 1905 | error: |
f76aec76 KA |
1906 | if (iova) |
1907 | __free_iova(&domain->iovad, iova); | |
ba395927 KA |
1908 | printk(KERN_ERR"Device %s request: %lx@%llx dir %d --- failed\n", |
1909 | pci_name(pdev), size, (u64)addr, dir); | |
1910 | return 0; | |
1911 | } | |
1912 | ||
f76aec76 | 1913 | static void intel_unmap_single(struct device *dev, dma_addr_t dev_addr, |
ba395927 KA |
1914 | size_t size, int dir) |
1915 | { | |
ba395927 | 1916 | struct pci_dev *pdev = to_pci_dev(dev); |
f76aec76 KA |
1917 | struct dmar_domain *domain; |
1918 | unsigned long start_addr; | |
ba395927 KA |
1919 | struct iova *iova; |
1920 | ||
358dd8ac | 1921 | if (pdev->dev.archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO) |
f76aec76 | 1922 | return; |
ba395927 KA |
1923 | domain = find_domain(pdev); |
1924 | BUG_ON(!domain); | |
1925 | ||
1926 | iova = find_iova(&domain->iovad, IOVA_PFN(dev_addr)); | |
f76aec76 | 1927 | if (!iova) |
ba395927 | 1928 | return; |
ba395927 | 1929 | |
f76aec76 KA |
1930 | start_addr = iova->pfn_lo << PAGE_SHIFT_4K; |
1931 | size = aligned_size((u64)dev_addr, size); | |
ba395927 | 1932 | |
f76aec76 KA |
1933 | pr_debug("Device %s unmapping: %lx@%llx\n", |
1934 | pci_name(pdev), size, (u64)start_addr); | |
ba395927 | 1935 | |
f76aec76 KA |
1936 | /* clear the whole page */ |
1937 | dma_pte_clear_range(domain, start_addr, start_addr + size); | |
1938 | /* free page tables */ | |
1939 | dma_pte_free_pagetable(domain, start_addr, start_addr + size); | |
1940 | ||
1941 | if (iommu_flush_iotlb_psi(domain->iommu, domain->id, start_addr, | |
1942 | size >> PAGE_SHIFT_4K, 0)) | |
ba395927 | 1943 | iommu_flush_write_buffer(domain->iommu); |
f76aec76 KA |
1944 | |
1945 | /* free iova */ | |
1946 | __free_iova(&domain->iovad, iova); | |
ba395927 KA |
1947 | } |
1948 | ||
1949 | static void * intel_alloc_coherent(struct device *hwdev, size_t size, | |
1950 | dma_addr_t *dma_handle, gfp_t flags) | |
1951 | { | |
1952 | void *vaddr; | |
1953 | int order; | |
1954 | ||
1955 | size = PAGE_ALIGN_4K(size); | |
1956 | order = get_order(size); | |
1957 | flags &= ~(GFP_DMA | GFP_DMA32); | |
1958 | ||
1959 | vaddr = (void *)__get_free_pages(flags, order); | |
1960 | if (!vaddr) | |
1961 | return NULL; | |
1962 | memset(vaddr, 0, size); | |
1963 | ||
1964 | *dma_handle = intel_map_single(hwdev, vaddr, size, DMA_BIDIRECTIONAL); | |
1965 | if (*dma_handle) | |
1966 | return vaddr; | |
1967 | free_pages((unsigned long)vaddr, order); | |
1968 | return NULL; | |
1969 | } | |
1970 | ||
1971 | static void intel_free_coherent(struct device *hwdev, size_t size, | |
1972 | void *vaddr, dma_addr_t dma_handle) | |
1973 | { | |
1974 | int order; | |
1975 | ||
1976 | size = PAGE_ALIGN_4K(size); | |
1977 | order = get_order(size); | |
1978 | ||
1979 | intel_unmap_single(hwdev, dma_handle, size, DMA_BIDIRECTIONAL); | |
1980 | free_pages((unsigned long)vaddr, order); | |
1981 | } | |
1982 | ||
12d4d40e | 1983 | #define SG_ENT_VIRT_ADDRESS(sg) (sg_virt((sg))) |
c03ab37c | 1984 | static void intel_unmap_sg(struct device *hwdev, struct scatterlist *sglist, |
ba395927 KA |
1985 | int nelems, int dir) |
1986 | { | |
1987 | int i; | |
1988 | struct pci_dev *pdev = to_pci_dev(hwdev); | |
1989 | struct dmar_domain *domain; | |
f76aec76 KA |
1990 | unsigned long start_addr; |
1991 | struct iova *iova; | |
1992 | size_t size = 0; | |
1993 | void *addr; | |
c03ab37c | 1994 | struct scatterlist *sg; |
ba395927 | 1995 | |
358dd8ac | 1996 | if (pdev->dev.archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO) |
ba395927 KA |
1997 | return; |
1998 | ||
1999 | domain = find_domain(pdev); | |
ba395927 | 2000 | |
c03ab37c | 2001 | iova = find_iova(&domain->iovad, IOVA_PFN(sglist[0].dma_address)); |
f76aec76 KA |
2002 | if (!iova) |
2003 | return; | |
c03ab37c | 2004 | for_each_sg(sglist, sg, nelems, i) { |
f76aec76 KA |
2005 | addr = SG_ENT_VIRT_ADDRESS(sg); |
2006 | size += aligned_size((u64)addr, sg->length); | |
2007 | } | |
2008 | ||
2009 | start_addr = iova->pfn_lo << PAGE_SHIFT_4K; | |
2010 | ||
2011 | /* clear the whole page */ | |
2012 | dma_pte_clear_range(domain, start_addr, start_addr + size); | |
2013 | /* free page tables */ | |
2014 | dma_pte_free_pagetable(domain, start_addr, start_addr + size); | |
2015 | ||
2016 | if (iommu_flush_iotlb_psi(domain->iommu, domain->id, start_addr, | |
2017 | size >> PAGE_SHIFT_4K, 0)) | |
ba395927 | 2018 | iommu_flush_write_buffer(domain->iommu); |
f76aec76 KA |
2019 | |
2020 | /* free iova */ | |
2021 | __free_iova(&domain->iovad, iova); | |
ba395927 KA |
2022 | } |
2023 | ||
ba395927 | 2024 | static int intel_nontranslate_map_sg(struct device *hddev, |
c03ab37c | 2025 | struct scatterlist *sglist, int nelems, int dir) |
ba395927 KA |
2026 | { |
2027 | int i; | |
c03ab37c | 2028 | struct scatterlist *sg; |
ba395927 | 2029 | |
c03ab37c | 2030 | for_each_sg(sglist, sg, nelems, i) { |
12d4d40e | 2031 | BUG_ON(!sg_page(sg)); |
c03ab37c FT |
2032 | sg->dma_address = virt_to_bus(SG_ENT_VIRT_ADDRESS(sg)); |
2033 | sg->dma_length = sg->length; | |
ba395927 KA |
2034 | } |
2035 | return nelems; | |
2036 | } | |
2037 | ||
c03ab37c FT |
2038 | static int intel_map_sg(struct device *hwdev, struct scatterlist *sglist, |
2039 | int nelems, int dir) | |
ba395927 KA |
2040 | { |
2041 | void *addr; | |
2042 | int i; | |
ba395927 KA |
2043 | struct pci_dev *pdev = to_pci_dev(hwdev); |
2044 | struct dmar_domain *domain; | |
f76aec76 KA |
2045 | size_t size = 0; |
2046 | int prot = 0; | |
2047 | size_t offset = 0; | |
2048 | struct iova *iova = NULL; | |
2049 | int ret; | |
c03ab37c | 2050 | struct scatterlist *sg; |
f76aec76 | 2051 | unsigned long start_addr; |
ba395927 KA |
2052 | |
2053 | BUG_ON(dir == DMA_NONE); | |
358dd8ac | 2054 | if (pdev->dev.archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO) |
c03ab37c | 2055 | return intel_nontranslate_map_sg(hwdev, sglist, nelems, dir); |
ba395927 | 2056 | |
f76aec76 KA |
2057 | domain = get_valid_domain_for_dev(pdev); |
2058 | if (!domain) | |
2059 | return 0; | |
2060 | ||
c03ab37c | 2061 | for_each_sg(sglist, sg, nelems, i) { |
ba395927 | 2062 | addr = SG_ENT_VIRT_ADDRESS(sg); |
f76aec76 KA |
2063 | addr = (void *)virt_to_phys(addr); |
2064 | size += aligned_size((u64)addr, sg->length); | |
2065 | } | |
2066 | ||
2067 | iova = __intel_alloc_iova(hwdev, domain, size); | |
2068 | if (!iova) { | |
c03ab37c | 2069 | sglist->dma_length = 0; |
f76aec76 KA |
2070 | return 0; |
2071 | } | |
2072 | ||
2073 | /* | |
2074 | * Check if DMAR supports zero-length reads on write only | |
2075 | * mappings.. | |
2076 | */ | |
2077 | if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL || \ | |
2078 | !cap_zlr(domain->iommu->cap)) | |
2079 | prot |= DMA_PTE_READ; | |
2080 | if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) | |
2081 | prot |= DMA_PTE_WRITE; | |
2082 | ||
2083 | start_addr = iova->pfn_lo << PAGE_SHIFT_4K; | |
2084 | offset = 0; | |
c03ab37c | 2085 | for_each_sg(sglist, sg, nelems, i) { |
f76aec76 KA |
2086 | addr = SG_ENT_VIRT_ADDRESS(sg); |
2087 | addr = (void *)virt_to_phys(addr); | |
2088 | size = aligned_size((u64)addr, sg->length); | |
2089 | ret = domain_page_mapping(domain, start_addr + offset, | |
2090 | ((u64)addr) & PAGE_MASK_4K, | |
2091 | size, prot); | |
2092 | if (ret) { | |
2093 | /* clear the page */ | |
2094 | dma_pte_clear_range(domain, start_addr, | |
2095 | start_addr + offset); | |
2096 | /* free page tables */ | |
2097 | dma_pte_free_pagetable(domain, start_addr, | |
2098 | start_addr + offset); | |
2099 | /* free iova */ | |
2100 | __free_iova(&domain->iovad, iova); | |
ba395927 KA |
2101 | return 0; |
2102 | } | |
f76aec76 KA |
2103 | sg->dma_address = start_addr + offset + |
2104 | ((u64)addr & (~PAGE_MASK_4K)); | |
ba395927 | 2105 | sg->dma_length = sg->length; |
f76aec76 | 2106 | offset += size; |
ba395927 KA |
2107 | } |
2108 | ||
ba395927 | 2109 | /* it's a non-present to present mapping */ |
f76aec76 KA |
2110 | if (iommu_flush_iotlb_psi(domain->iommu, domain->id, |
2111 | start_addr, offset >> PAGE_SHIFT_4K, 1)) | |
ba395927 KA |
2112 | iommu_flush_write_buffer(domain->iommu); |
2113 | return nelems; | |
2114 | } | |
2115 | ||
2116 | static struct dma_mapping_ops intel_dma_ops = { | |
2117 | .alloc_coherent = intel_alloc_coherent, | |
2118 | .free_coherent = intel_free_coherent, | |
2119 | .map_single = intel_map_single, | |
2120 | .unmap_single = intel_unmap_single, | |
2121 | .map_sg = intel_map_sg, | |
2122 | .unmap_sg = intel_unmap_sg, | |
2123 | }; | |
2124 | ||
2125 | static inline int iommu_domain_cache_init(void) | |
2126 | { | |
2127 | int ret = 0; | |
2128 | ||
2129 | iommu_domain_cache = kmem_cache_create("iommu_domain", | |
2130 | sizeof(struct dmar_domain), | |
2131 | 0, | |
2132 | SLAB_HWCACHE_ALIGN, | |
2133 | ||
2134 | NULL); | |
2135 | if (!iommu_domain_cache) { | |
2136 | printk(KERN_ERR "Couldn't create iommu_domain cache\n"); | |
2137 | ret = -ENOMEM; | |
2138 | } | |
2139 | ||
2140 | return ret; | |
2141 | } | |
2142 | ||
2143 | static inline int iommu_devinfo_cache_init(void) | |
2144 | { | |
2145 | int ret = 0; | |
2146 | ||
2147 | iommu_devinfo_cache = kmem_cache_create("iommu_devinfo", | |
2148 | sizeof(struct device_domain_info), | |
2149 | 0, | |
2150 | SLAB_HWCACHE_ALIGN, | |
2151 | ||
2152 | NULL); | |
2153 | if (!iommu_devinfo_cache) { | |
2154 | printk(KERN_ERR "Couldn't create devinfo cache\n"); | |
2155 | ret = -ENOMEM; | |
2156 | } | |
2157 | ||
2158 | return ret; | |
2159 | } | |
2160 | ||
2161 | static inline int iommu_iova_cache_init(void) | |
2162 | { | |
2163 | int ret = 0; | |
2164 | ||
2165 | iommu_iova_cache = kmem_cache_create("iommu_iova", | |
2166 | sizeof(struct iova), | |
2167 | 0, | |
2168 | SLAB_HWCACHE_ALIGN, | |
2169 | ||
2170 | NULL); | |
2171 | if (!iommu_iova_cache) { | |
2172 | printk(KERN_ERR "Couldn't create iova cache\n"); | |
2173 | ret = -ENOMEM; | |
2174 | } | |
2175 | ||
2176 | return ret; | |
2177 | } | |
2178 | ||
2179 | static int __init iommu_init_mempool(void) | |
2180 | { | |
2181 | int ret; | |
2182 | ret = iommu_iova_cache_init(); | |
2183 | if (ret) | |
2184 | return ret; | |
2185 | ||
2186 | ret = iommu_domain_cache_init(); | |
2187 | if (ret) | |
2188 | goto domain_error; | |
2189 | ||
2190 | ret = iommu_devinfo_cache_init(); | |
2191 | if (!ret) | |
2192 | return ret; | |
2193 | ||
2194 | kmem_cache_destroy(iommu_domain_cache); | |
2195 | domain_error: | |
2196 | kmem_cache_destroy(iommu_iova_cache); | |
2197 | ||
2198 | return -ENOMEM; | |
2199 | } | |
2200 | ||
2201 | static void __init iommu_exit_mempool(void) | |
2202 | { | |
2203 | kmem_cache_destroy(iommu_devinfo_cache); | |
2204 | kmem_cache_destroy(iommu_domain_cache); | |
2205 | kmem_cache_destroy(iommu_iova_cache); | |
2206 | ||
2207 | } | |
2208 | ||
2209 | void __init detect_intel_iommu(void) | |
2210 | { | |
2211 | if (swiotlb || no_iommu || iommu_detected || dmar_disabled) | |
2212 | return; | |
2213 | if (early_dmar_detect()) { | |
2214 | iommu_detected = 1; | |
2215 | } | |
2216 | } | |
2217 | ||
2218 | static void __init init_no_remapping_devices(void) | |
2219 | { | |
2220 | struct dmar_drhd_unit *drhd; | |
2221 | ||
2222 | for_each_drhd_unit(drhd) { | |
2223 | if (!drhd->include_all) { | |
2224 | int i; | |
2225 | for (i = 0; i < drhd->devices_cnt; i++) | |
2226 | if (drhd->devices[i] != NULL) | |
2227 | break; | |
2228 | /* ignore DMAR unit if no pci devices exist */ | |
2229 | if (i == drhd->devices_cnt) | |
2230 | drhd->ignored = 1; | |
2231 | } | |
2232 | } | |
2233 | ||
2234 | if (dmar_map_gfx) | |
2235 | return; | |
2236 | ||
2237 | for_each_drhd_unit(drhd) { | |
2238 | int i; | |
2239 | if (drhd->ignored || drhd->include_all) | |
2240 | continue; | |
2241 | ||
2242 | for (i = 0; i < drhd->devices_cnt; i++) | |
2243 | if (drhd->devices[i] && | |
2244 | !IS_GFX_DEVICE(drhd->devices[i])) | |
2245 | break; | |
2246 | ||
2247 | if (i < drhd->devices_cnt) | |
2248 | continue; | |
2249 | ||
2250 | /* bypass IOMMU if it is just for gfx devices */ | |
2251 | drhd->ignored = 1; | |
2252 | for (i = 0; i < drhd->devices_cnt; i++) { | |
2253 | if (!drhd->devices[i]) | |
2254 | continue; | |
358dd8ac | 2255 | drhd->devices[i]->dev.archdata.iommu = DUMMY_DEVICE_DOMAIN_INFO; |
ba395927 KA |
2256 | } |
2257 | } | |
2258 | } | |
2259 | ||
2260 | int __init intel_iommu_init(void) | |
2261 | { | |
2262 | int ret = 0; | |
2263 | ||
2264 | if (no_iommu || swiotlb || dmar_disabled) | |
2265 | return -ENODEV; | |
2266 | ||
2267 | if (dmar_table_init()) | |
2268 | return -ENODEV; | |
2269 | ||
2270 | iommu_init_mempool(); | |
2271 | dmar_init_reserved_ranges(); | |
2272 | ||
2273 | init_no_remapping_devices(); | |
2274 | ||
2275 | ret = init_dmars(); | |
2276 | if (ret) { | |
2277 | printk(KERN_ERR "IOMMU: dmar init failed\n"); | |
2278 | put_iova_domain(&reserved_iova_list); | |
2279 | iommu_exit_mempool(); | |
2280 | return ret; | |
2281 | } | |
2282 | printk(KERN_INFO | |
2283 | "PCI-DMA: Intel(R) Virtualization Technology for Directed I/O\n"); | |
2284 | ||
2285 | force_iommu = 1; | |
2286 | dma_ops = &intel_dma_ops; | |
2287 | return 0; | |
2288 | } | |
e820482c | 2289 |