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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 | * | |
17 | * Copyright (C) Ashok Raj <ashok.raj@intel.com> | |
18 | * Copyright (C) Shaohua Li <shaohua.li@intel.com> | |
19 | * Copyright (C) Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> | |
20 | */ | |
21 | ||
22 | #include <linux/init.h> | |
23 | #include <linux/bitmap.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/irq.h> | |
26 | #include <linux/interrupt.h> | |
27 | #include <linux/sysdev.h> | |
28 | #include <linux/spinlock.h> | |
29 | #include <linux/pci.h> | |
30 | #include <linux/dmar.h> | |
31 | #include <linux/dma-mapping.h> | |
32 | #include <linux/mempool.h> | |
33 | #include "iova.h" | |
34 | #include "intel-iommu.h" | |
35 | #include <asm/proto.h> /* force_iommu in this header in x86-64*/ | |
36 | #include <asm/cacheflush.h> | |
37 | #include <asm/iommu.h> | |
38 | #include "pci.h" | |
39 | ||
40 | #define IS_GFX_DEVICE(pdev) ((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY) | |
41 | #define IS_ISA_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA) | |
42 | ||
43 | #define IOAPIC_RANGE_START (0xfee00000) | |
44 | #define IOAPIC_RANGE_END (0xfeefffff) | |
45 | #define IOVA_START_ADDR (0x1000) | |
46 | ||
47 | #define DEFAULT_DOMAIN_ADDRESS_WIDTH 48 | |
48 | ||
49 | #define DMAR_OPERATION_TIMEOUT (HZ*60) /* 1m */ | |
50 | ||
51 | #define DOMAIN_MAX_ADDR(gaw) ((((u64)1) << gaw) - 1) | |
52 | ||
53 | static void domain_remove_dev_info(struct dmar_domain *domain); | |
54 | ||
55 | static int dmar_disabled; | |
56 | static int __initdata dmar_map_gfx = 1; | |
57 | ||
58 | #define DUMMY_DEVICE_DOMAIN_INFO ((struct device_domain_info *)(-1)) | |
59 | static DEFINE_SPINLOCK(device_domain_lock); | |
60 | static LIST_HEAD(device_domain_list); | |
61 | ||
62 | static int __init intel_iommu_setup(char *str) | |
63 | { | |
64 | if (!str) | |
65 | return -EINVAL; | |
66 | while (*str) { | |
67 | if (!strncmp(str, "off", 3)) { | |
68 | dmar_disabled = 1; | |
69 | printk(KERN_INFO"Intel-IOMMU: disabled\n"); | |
70 | } else if (!strncmp(str, "igfx_off", 8)) { | |
71 | dmar_map_gfx = 0; | |
72 | printk(KERN_INFO | |
73 | "Intel-IOMMU: disable GFX device mapping\n"); | |
74 | } | |
75 | ||
76 | str += strcspn(str, ","); | |
77 | while (*str == ',') | |
78 | str++; | |
79 | } | |
80 | return 0; | |
81 | } | |
82 | __setup("intel_iommu=", intel_iommu_setup); | |
83 | ||
84 | static struct kmem_cache *iommu_domain_cache; | |
85 | static struct kmem_cache *iommu_devinfo_cache; | |
86 | static struct kmem_cache *iommu_iova_cache; | |
87 | ||
88 | static inline void *alloc_pgtable_page(void) | |
89 | { | |
90 | return (void *)get_zeroed_page(GFP_ATOMIC); | |
91 | } | |
92 | ||
93 | static inline void free_pgtable_page(void *vaddr) | |
94 | { | |
95 | free_page((unsigned long)vaddr); | |
96 | } | |
97 | ||
98 | static inline void *alloc_domain_mem(void) | |
99 | { | |
100 | return kmem_cache_alloc(iommu_domain_cache, GFP_ATOMIC); | |
101 | } | |
102 | ||
103 | static inline void free_domain_mem(void *vaddr) | |
104 | { | |
105 | kmem_cache_free(iommu_domain_cache, vaddr); | |
106 | } | |
107 | ||
108 | static inline void * alloc_devinfo_mem(void) | |
109 | { | |
110 | return kmem_cache_alloc(iommu_devinfo_cache, GFP_ATOMIC); | |
111 | } | |
112 | ||
113 | static inline void free_devinfo_mem(void *vaddr) | |
114 | { | |
115 | kmem_cache_free(iommu_devinfo_cache, vaddr); | |
116 | } | |
117 | ||
118 | struct iova *alloc_iova_mem(void) | |
119 | { | |
120 | return kmem_cache_alloc(iommu_iova_cache, GFP_ATOMIC); | |
121 | } | |
122 | ||
123 | void free_iova_mem(struct iova *iova) | |
124 | { | |
125 | kmem_cache_free(iommu_iova_cache, iova); | |
126 | } | |
127 | ||
128 | static inline void __iommu_flush_cache( | |
129 | struct intel_iommu *iommu, void *addr, int size) | |
130 | { | |
131 | if (!ecap_coherent(iommu->ecap)) | |
132 | clflush_cache_range(addr, size); | |
133 | } | |
134 | ||
135 | /* Gets context entry for a given bus and devfn */ | |
136 | static struct context_entry * device_to_context_entry(struct intel_iommu *iommu, | |
137 | u8 bus, u8 devfn) | |
138 | { | |
139 | struct root_entry *root; | |
140 | struct context_entry *context; | |
141 | unsigned long phy_addr; | |
142 | unsigned long flags; | |
143 | ||
144 | spin_lock_irqsave(&iommu->lock, flags); | |
145 | root = &iommu->root_entry[bus]; | |
146 | context = get_context_addr_from_root(root); | |
147 | if (!context) { | |
148 | context = (struct context_entry *)alloc_pgtable_page(); | |
149 | if (!context) { | |
150 | spin_unlock_irqrestore(&iommu->lock, flags); | |
151 | return NULL; | |
152 | } | |
153 | __iommu_flush_cache(iommu, (void *)context, PAGE_SIZE_4K); | |
154 | phy_addr = virt_to_phys((void *)context); | |
155 | set_root_value(root, phy_addr); | |
156 | set_root_present(root); | |
157 | __iommu_flush_cache(iommu, root, sizeof(*root)); | |
158 | } | |
159 | spin_unlock_irqrestore(&iommu->lock, flags); | |
160 | return &context[devfn]; | |
161 | } | |
162 | ||
163 | static int device_context_mapped(struct intel_iommu *iommu, u8 bus, u8 devfn) | |
164 | { | |
165 | struct root_entry *root; | |
166 | struct context_entry *context; | |
167 | int ret; | |
168 | unsigned long flags; | |
169 | ||
170 | spin_lock_irqsave(&iommu->lock, flags); | |
171 | root = &iommu->root_entry[bus]; | |
172 | context = get_context_addr_from_root(root); | |
173 | if (!context) { | |
174 | ret = 0; | |
175 | goto out; | |
176 | } | |
177 | ret = context_present(context[devfn]); | |
178 | out: | |
179 | spin_unlock_irqrestore(&iommu->lock, flags); | |
180 | return ret; | |
181 | } | |
182 | ||
183 | static void clear_context_table(struct intel_iommu *iommu, u8 bus, u8 devfn) | |
184 | { | |
185 | struct root_entry *root; | |
186 | struct context_entry *context; | |
187 | unsigned long flags; | |
188 | ||
189 | spin_lock_irqsave(&iommu->lock, flags); | |
190 | root = &iommu->root_entry[bus]; | |
191 | context = get_context_addr_from_root(root); | |
192 | if (context) { | |
193 | context_clear_entry(context[devfn]); | |
194 | __iommu_flush_cache(iommu, &context[devfn], \ | |
195 | sizeof(*context)); | |
196 | } | |
197 | spin_unlock_irqrestore(&iommu->lock, flags); | |
198 | } | |
199 | ||
200 | static void free_context_table(struct intel_iommu *iommu) | |
201 | { | |
202 | struct root_entry *root; | |
203 | int i; | |
204 | unsigned long flags; | |
205 | struct context_entry *context; | |
206 | ||
207 | spin_lock_irqsave(&iommu->lock, flags); | |
208 | if (!iommu->root_entry) { | |
209 | goto out; | |
210 | } | |
211 | for (i = 0; i < ROOT_ENTRY_NR; i++) { | |
212 | root = &iommu->root_entry[i]; | |
213 | context = get_context_addr_from_root(root); | |
214 | if (context) | |
215 | free_pgtable_page(context); | |
216 | } | |
217 | free_pgtable_page(iommu->root_entry); | |
218 | iommu->root_entry = NULL; | |
219 | out: | |
220 | spin_unlock_irqrestore(&iommu->lock, flags); | |
221 | } | |
222 | ||
223 | /* page table handling */ | |
224 | #define LEVEL_STRIDE (9) | |
225 | #define LEVEL_MASK (((u64)1 << LEVEL_STRIDE) - 1) | |
226 | ||
227 | static inline int agaw_to_level(int agaw) | |
228 | { | |
229 | return agaw + 2; | |
230 | } | |
231 | ||
232 | static inline int agaw_to_width(int agaw) | |
233 | { | |
234 | return 30 + agaw * LEVEL_STRIDE; | |
235 | ||
236 | } | |
237 | ||
238 | static inline int width_to_agaw(int width) | |
239 | { | |
240 | return (width - 30) / LEVEL_STRIDE; | |
241 | } | |
242 | ||
243 | static inline unsigned int level_to_offset_bits(int level) | |
244 | { | |
245 | return (12 + (level - 1) * LEVEL_STRIDE); | |
246 | } | |
247 | ||
248 | static inline int address_level_offset(u64 addr, int level) | |
249 | { | |
250 | return ((addr >> level_to_offset_bits(level)) & LEVEL_MASK); | |
251 | } | |
252 | ||
253 | static inline u64 level_mask(int level) | |
254 | { | |
255 | return ((u64)-1 << level_to_offset_bits(level)); | |
256 | } | |
257 | ||
258 | static inline u64 level_size(int level) | |
259 | { | |
260 | return ((u64)1 << level_to_offset_bits(level)); | |
261 | } | |
262 | ||
263 | static inline u64 align_to_level(u64 addr, int level) | |
264 | { | |
265 | return ((addr + level_size(level) - 1) & level_mask(level)); | |
266 | } | |
267 | ||
268 | static struct dma_pte * addr_to_dma_pte(struct dmar_domain *domain, u64 addr) | |
269 | { | |
270 | int addr_width = agaw_to_width(domain->agaw); | |
271 | struct dma_pte *parent, *pte = NULL; | |
272 | int level = agaw_to_level(domain->agaw); | |
273 | int offset; | |
274 | unsigned long flags; | |
275 | ||
276 | BUG_ON(!domain->pgd); | |
277 | ||
278 | addr &= (((u64)1) << addr_width) - 1; | |
279 | parent = domain->pgd; | |
280 | ||
281 | spin_lock_irqsave(&domain->mapping_lock, flags); | |
282 | while (level > 0) { | |
283 | void *tmp_page; | |
284 | ||
285 | offset = address_level_offset(addr, level); | |
286 | pte = &parent[offset]; | |
287 | if (level == 1) | |
288 | break; | |
289 | ||
290 | if (!dma_pte_present(*pte)) { | |
291 | tmp_page = alloc_pgtable_page(); | |
292 | ||
293 | if (!tmp_page) { | |
294 | spin_unlock_irqrestore(&domain->mapping_lock, | |
295 | flags); | |
296 | return NULL; | |
297 | } | |
298 | __iommu_flush_cache(domain->iommu, tmp_page, | |
299 | PAGE_SIZE_4K); | |
300 | dma_set_pte_addr(*pte, virt_to_phys(tmp_page)); | |
301 | /* | |
302 | * high level table always sets r/w, last level page | |
303 | * table control read/write | |
304 | */ | |
305 | dma_set_pte_readable(*pte); | |
306 | dma_set_pte_writable(*pte); | |
307 | __iommu_flush_cache(domain->iommu, pte, sizeof(*pte)); | |
308 | } | |
309 | parent = phys_to_virt(dma_pte_addr(*pte)); | |
310 | level--; | |
311 | } | |
312 | ||
313 | spin_unlock_irqrestore(&domain->mapping_lock, flags); | |
314 | return pte; | |
315 | } | |
316 | ||
317 | /* return address's pte at specific level */ | |
318 | static struct dma_pte *dma_addr_level_pte(struct dmar_domain *domain, u64 addr, | |
319 | int level) | |
320 | { | |
321 | struct dma_pte *parent, *pte = NULL; | |
322 | int total = agaw_to_level(domain->agaw); | |
323 | int offset; | |
324 | ||
325 | parent = domain->pgd; | |
326 | while (level <= total) { | |
327 | offset = address_level_offset(addr, total); | |
328 | pte = &parent[offset]; | |
329 | if (level == total) | |
330 | return pte; | |
331 | ||
332 | if (!dma_pte_present(*pte)) | |
333 | break; | |
334 | parent = phys_to_virt(dma_pte_addr(*pte)); | |
335 | total--; | |
336 | } | |
337 | return NULL; | |
338 | } | |
339 | ||
340 | /* clear one page's page table */ | |
341 | static void dma_pte_clear_one(struct dmar_domain *domain, u64 addr) | |
342 | { | |
343 | struct dma_pte *pte = NULL; | |
344 | ||
345 | /* get last level pte */ | |
346 | pte = dma_addr_level_pte(domain, addr, 1); | |
347 | ||
348 | if (pte) { | |
349 | dma_clear_pte(*pte); | |
350 | __iommu_flush_cache(domain->iommu, pte, sizeof(*pte)); | |
351 | } | |
352 | } | |
353 | ||
354 | /* clear last level pte, a tlb flush should be followed */ | |
355 | static void dma_pte_clear_range(struct dmar_domain *domain, u64 start, u64 end) | |
356 | { | |
357 | int addr_width = agaw_to_width(domain->agaw); | |
358 | ||
359 | start &= (((u64)1) << addr_width) - 1; | |
360 | end &= (((u64)1) << addr_width) - 1; | |
361 | /* in case it's partial page */ | |
362 | start = PAGE_ALIGN_4K(start); | |
363 | end &= PAGE_MASK_4K; | |
364 | ||
365 | /* we don't need lock here, nobody else touches the iova range */ | |
366 | while (start < end) { | |
367 | dma_pte_clear_one(domain, start); | |
368 | start += PAGE_SIZE_4K; | |
369 | } | |
370 | } | |
371 | ||
372 | /* free page table pages. last level pte should already be cleared */ | |
373 | static void dma_pte_free_pagetable(struct dmar_domain *domain, | |
374 | u64 start, u64 end) | |
375 | { | |
376 | int addr_width = agaw_to_width(domain->agaw); | |
377 | struct dma_pte *pte; | |
378 | int total = agaw_to_level(domain->agaw); | |
379 | int level; | |
380 | u64 tmp; | |
381 | ||
382 | start &= (((u64)1) << addr_width) - 1; | |
383 | end &= (((u64)1) << addr_width) - 1; | |
384 | ||
385 | /* we don't need lock here, nobody else touches the iova range */ | |
386 | level = 2; | |
387 | while (level <= total) { | |
388 | tmp = align_to_level(start, level); | |
389 | if (tmp >= end || (tmp + level_size(level) > end)) | |
390 | return; | |
391 | ||
392 | while (tmp < end) { | |
393 | pte = dma_addr_level_pte(domain, tmp, level); | |
394 | if (pte) { | |
395 | free_pgtable_page( | |
396 | phys_to_virt(dma_pte_addr(*pte))); | |
397 | dma_clear_pte(*pte); | |
398 | __iommu_flush_cache(domain->iommu, | |
399 | pte, sizeof(*pte)); | |
400 | } | |
401 | tmp += level_size(level); | |
402 | } | |
403 | level++; | |
404 | } | |
405 | /* free pgd */ | |
406 | if (start == 0 && end >= ((((u64)1) << addr_width) - 1)) { | |
407 | free_pgtable_page(domain->pgd); | |
408 | domain->pgd = NULL; | |
409 | } | |
410 | } | |
411 | ||
412 | /* iommu handling */ | |
413 | static int iommu_alloc_root_entry(struct intel_iommu *iommu) | |
414 | { | |
415 | struct root_entry *root; | |
416 | unsigned long flags; | |
417 | ||
418 | root = (struct root_entry *)alloc_pgtable_page(); | |
419 | if (!root) | |
420 | return -ENOMEM; | |
421 | ||
422 | __iommu_flush_cache(iommu, root, PAGE_SIZE_4K); | |
423 | ||
424 | spin_lock_irqsave(&iommu->lock, flags); | |
425 | iommu->root_entry = root; | |
426 | spin_unlock_irqrestore(&iommu->lock, flags); | |
427 | ||
428 | return 0; | |
429 | } | |
430 | ||
431 | #define IOMMU_WAIT_OP(iommu, offset, op, cond, sts) \ | |
432 | {\ | |
433 | unsigned long start_time = jiffies;\ | |
434 | while (1) {\ | |
435 | sts = op (iommu->reg + offset);\ | |
436 | if (cond)\ | |
437 | break;\ | |
438 | if (time_after(jiffies, start_time + DMAR_OPERATION_TIMEOUT))\ | |
439 | panic("DMAR hardware is malfunctioning\n");\ | |
440 | cpu_relax();\ | |
441 | }\ | |
442 | } | |
443 | ||
444 | static void iommu_set_root_entry(struct intel_iommu *iommu) | |
445 | { | |
446 | void *addr; | |
447 | u32 cmd, sts; | |
448 | unsigned long flag; | |
449 | ||
450 | addr = iommu->root_entry; | |
451 | ||
452 | spin_lock_irqsave(&iommu->register_lock, flag); | |
453 | dmar_writeq(iommu->reg + DMAR_RTADDR_REG, virt_to_phys(addr)); | |
454 | ||
455 | cmd = iommu->gcmd | DMA_GCMD_SRTP; | |
456 | writel(cmd, iommu->reg + DMAR_GCMD_REG); | |
457 | ||
458 | /* Make sure hardware complete it */ | |
459 | IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, | |
460 | readl, (sts & DMA_GSTS_RTPS), sts); | |
461 | ||
462 | spin_unlock_irqrestore(&iommu->register_lock, flag); | |
463 | } | |
464 | ||
465 | static void iommu_flush_write_buffer(struct intel_iommu *iommu) | |
466 | { | |
467 | u32 val; | |
468 | unsigned long flag; | |
469 | ||
470 | if (!cap_rwbf(iommu->cap)) | |
471 | return; | |
472 | val = iommu->gcmd | DMA_GCMD_WBF; | |
473 | ||
474 | spin_lock_irqsave(&iommu->register_lock, flag); | |
475 | writel(val, iommu->reg + DMAR_GCMD_REG); | |
476 | ||
477 | /* Make sure hardware complete it */ | |
478 | IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, | |
479 | readl, (!(val & DMA_GSTS_WBFS)), val); | |
480 | ||
481 | spin_unlock_irqrestore(&iommu->register_lock, flag); | |
482 | } | |
483 | ||
484 | /* return value determine if we need a write buffer flush */ | |
485 | static int __iommu_flush_context(struct intel_iommu *iommu, | |
486 | u16 did, u16 source_id, u8 function_mask, u64 type, | |
487 | int non_present_entry_flush) | |
488 | { | |
489 | u64 val = 0; | |
490 | unsigned long flag; | |
491 | ||
492 | /* | |
493 | * In the non-present entry flush case, if hardware doesn't cache | |
494 | * non-present entry we do nothing and if hardware cache non-present | |
495 | * entry, we flush entries of domain 0 (the domain id is used to cache | |
496 | * any non-present entries) | |
497 | */ | |
498 | if (non_present_entry_flush) { | |
499 | if (!cap_caching_mode(iommu->cap)) | |
500 | return 1; | |
501 | else | |
502 | did = 0; | |
503 | } | |
504 | ||
505 | switch (type) { | |
506 | case DMA_CCMD_GLOBAL_INVL: | |
507 | val = DMA_CCMD_GLOBAL_INVL; | |
508 | break; | |
509 | case DMA_CCMD_DOMAIN_INVL: | |
510 | val = DMA_CCMD_DOMAIN_INVL|DMA_CCMD_DID(did); | |
511 | break; | |
512 | case DMA_CCMD_DEVICE_INVL: | |
513 | val = DMA_CCMD_DEVICE_INVL|DMA_CCMD_DID(did) | |
514 | | DMA_CCMD_SID(source_id) | DMA_CCMD_FM(function_mask); | |
515 | break; | |
516 | default: | |
517 | BUG(); | |
518 | } | |
519 | val |= DMA_CCMD_ICC; | |
520 | ||
521 | spin_lock_irqsave(&iommu->register_lock, flag); | |
522 | dmar_writeq(iommu->reg + DMAR_CCMD_REG, val); | |
523 | ||
524 | /* Make sure hardware complete it */ | |
525 | IOMMU_WAIT_OP(iommu, DMAR_CCMD_REG, | |
526 | dmar_readq, (!(val & DMA_CCMD_ICC)), val); | |
527 | ||
528 | spin_unlock_irqrestore(&iommu->register_lock, flag); | |
529 | ||
530 | /* flush context entry will implictly flush write buffer */ | |
531 | return 0; | |
532 | } | |
533 | ||
534 | static int inline iommu_flush_context_global(struct intel_iommu *iommu, | |
535 | int non_present_entry_flush) | |
536 | { | |
537 | return __iommu_flush_context(iommu, 0, 0, 0, DMA_CCMD_GLOBAL_INVL, | |
538 | non_present_entry_flush); | |
539 | } | |
540 | ||
541 | static int inline iommu_flush_context_domain(struct intel_iommu *iommu, u16 did, | |
542 | int non_present_entry_flush) | |
543 | { | |
544 | return __iommu_flush_context(iommu, did, 0, 0, DMA_CCMD_DOMAIN_INVL, | |
545 | non_present_entry_flush); | |
546 | } | |
547 | ||
548 | static int inline iommu_flush_context_device(struct intel_iommu *iommu, | |
549 | u16 did, u16 source_id, u8 function_mask, int non_present_entry_flush) | |
550 | { | |
551 | return __iommu_flush_context(iommu, did, source_id, function_mask, | |
552 | DMA_CCMD_DEVICE_INVL, non_present_entry_flush); | |
553 | } | |
554 | ||
555 | /* return value determine if we need a write buffer flush */ | |
556 | static int __iommu_flush_iotlb(struct intel_iommu *iommu, u16 did, | |
557 | u64 addr, unsigned int size_order, u64 type, | |
558 | int non_present_entry_flush) | |
559 | { | |
560 | int tlb_offset = ecap_iotlb_offset(iommu->ecap); | |
561 | u64 val = 0, val_iva = 0; | |
562 | unsigned long flag; | |
563 | ||
564 | /* | |
565 | * In the non-present entry flush case, if hardware doesn't cache | |
566 | * non-present entry we do nothing and if hardware cache non-present | |
567 | * entry, we flush entries of domain 0 (the domain id is used to cache | |
568 | * any non-present entries) | |
569 | */ | |
570 | if (non_present_entry_flush) { | |
571 | if (!cap_caching_mode(iommu->cap)) | |
572 | return 1; | |
573 | else | |
574 | did = 0; | |
575 | } | |
576 | ||
577 | switch (type) { | |
578 | case DMA_TLB_GLOBAL_FLUSH: | |
579 | /* global flush doesn't need set IVA_REG */ | |
580 | val = DMA_TLB_GLOBAL_FLUSH|DMA_TLB_IVT; | |
581 | break; | |
582 | case DMA_TLB_DSI_FLUSH: | |
583 | val = DMA_TLB_DSI_FLUSH|DMA_TLB_IVT|DMA_TLB_DID(did); | |
584 | break; | |
585 | case DMA_TLB_PSI_FLUSH: | |
586 | val = DMA_TLB_PSI_FLUSH|DMA_TLB_IVT|DMA_TLB_DID(did); | |
587 | /* Note: always flush non-leaf currently */ | |
588 | val_iva = size_order | addr; | |
589 | break; | |
590 | default: | |
591 | BUG(); | |
592 | } | |
593 | /* Note: set drain read/write */ | |
594 | #if 0 | |
595 | /* | |
596 | * This is probably to be super secure.. Looks like we can | |
597 | * ignore it without any impact. | |
598 | */ | |
599 | if (cap_read_drain(iommu->cap)) | |
600 | val |= DMA_TLB_READ_DRAIN; | |
601 | #endif | |
602 | if (cap_write_drain(iommu->cap)) | |
603 | val |= DMA_TLB_WRITE_DRAIN; | |
604 | ||
605 | spin_lock_irqsave(&iommu->register_lock, flag); | |
606 | /* Note: Only uses first TLB reg currently */ | |
607 | if (val_iva) | |
608 | dmar_writeq(iommu->reg + tlb_offset, val_iva); | |
609 | dmar_writeq(iommu->reg + tlb_offset + 8, val); | |
610 | ||
611 | /* Make sure hardware complete it */ | |
612 | IOMMU_WAIT_OP(iommu, tlb_offset + 8, | |
613 | dmar_readq, (!(val & DMA_TLB_IVT)), val); | |
614 | ||
615 | spin_unlock_irqrestore(&iommu->register_lock, flag); | |
616 | ||
617 | /* check IOTLB invalidation granularity */ | |
618 | if (DMA_TLB_IAIG(val) == 0) | |
619 | printk(KERN_ERR"IOMMU: flush IOTLB failed\n"); | |
620 | if (DMA_TLB_IAIG(val) != DMA_TLB_IIRG(type)) | |
621 | pr_debug("IOMMU: tlb flush request %Lx, actual %Lx\n", | |
622 | DMA_TLB_IIRG(type), DMA_TLB_IAIG(val)); | |
623 | /* flush context entry will implictly flush write buffer */ | |
624 | return 0; | |
625 | } | |
626 | ||
627 | static int inline iommu_flush_iotlb_global(struct intel_iommu *iommu, | |
628 | int non_present_entry_flush) | |
629 | { | |
630 | return __iommu_flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH, | |
631 | non_present_entry_flush); | |
632 | } | |
633 | ||
634 | static int inline iommu_flush_iotlb_dsi(struct intel_iommu *iommu, u16 did, | |
635 | int non_present_entry_flush) | |
636 | { | |
637 | return __iommu_flush_iotlb(iommu, did, 0, 0, DMA_TLB_DSI_FLUSH, | |
638 | non_present_entry_flush); | |
639 | } | |
640 | ||
641 | static int iommu_get_alignment(u64 base, unsigned int size) | |
642 | { | |
643 | int t = 0; | |
644 | u64 end; | |
645 | ||
646 | end = base + size - 1; | |
647 | while (base != end) { | |
648 | t++; | |
649 | base >>= 1; | |
650 | end >>= 1; | |
651 | } | |
652 | return t; | |
653 | } | |
654 | ||
655 | static int iommu_flush_iotlb_psi(struct intel_iommu *iommu, u16 did, | |
656 | u64 addr, unsigned int pages, int non_present_entry_flush) | |
657 | { | |
658 | unsigned int align; | |
659 | ||
660 | BUG_ON(addr & (~PAGE_MASK_4K)); | |
661 | BUG_ON(pages == 0); | |
662 | ||
663 | /* Fallback to domain selective flush if no PSI support */ | |
664 | if (!cap_pgsel_inv(iommu->cap)) | |
665 | return iommu_flush_iotlb_dsi(iommu, did, | |
666 | non_present_entry_flush); | |
667 | ||
668 | /* | |
669 | * PSI requires page size to be 2 ^ x, and the base address is naturally | |
670 | * aligned to the size | |
671 | */ | |
672 | align = iommu_get_alignment(addr >> PAGE_SHIFT_4K, pages); | |
673 | /* Fallback to domain selective flush if size is too big */ | |
674 | if (align > cap_max_amask_val(iommu->cap)) | |
675 | return iommu_flush_iotlb_dsi(iommu, did, | |
676 | non_present_entry_flush); | |
677 | ||
678 | addr >>= PAGE_SHIFT_4K + align; | |
679 | addr <<= PAGE_SHIFT_4K + align; | |
680 | ||
681 | return __iommu_flush_iotlb(iommu, did, addr, align, | |
682 | DMA_TLB_PSI_FLUSH, non_present_entry_flush); | |
683 | } | |
684 | ||
685 | static int iommu_enable_translation(struct intel_iommu *iommu) | |
686 | { | |
687 | u32 sts; | |
688 | unsigned long flags; | |
689 | ||
690 | spin_lock_irqsave(&iommu->register_lock, flags); | |
691 | writel(iommu->gcmd|DMA_GCMD_TE, iommu->reg + DMAR_GCMD_REG); | |
692 | ||
693 | /* Make sure hardware complete it */ | |
694 | IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, | |
695 | readl, (sts & DMA_GSTS_TES), sts); | |
696 | ||
697 | iommu->gcmd |= DMA_GCMD_TE; | |
698 | spin_unlock_irqrestore(&iommu->register_lock, flags); | |
699 | return 0; | |
700 | } | |
701 | ||
702 | static int iommu_disable_translation(struct intel_iommu *iommu) | |
703 | { | |
704 | u32 sts; | |
705 | unsigned long flag; | |
706 | ||
707 | spin_lock_irqsave(&iommu->register_lock, flag); | |
708 | iommu->gcmd &= ~DMA_GCMD_TE; | |
709 | writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); | |
710 | ||
711 | /* Make sure hardware complete it */ | |
712 | IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, | |
713 | readl, (!(sts & DMA_GSTS_TES)), sts); | |
714 | ||
715 | spin_unlock_irqrestore(&iommu->register_lock, flag); | |
716 | return 0; | |
717 | } | |
718 | ||
719 | static int iommu_init_domains(struct intel_iommu *iommu) | |
720 | { | |
721 | unsigned long ndomains; | |
722 | unsigned long nlongs; | |
723 | ||
724 | ndomains = cap_ndoms(iommu->cap); | |
725 | pr_debug("Number of Domains supportd <%ld>\n", ndomains); | |
726 | nlongs = BITS_TO_LONGS(ndomains); | |
727 | ||
728 | /* TBD: there might be 64K domains, | |
729 | * consider other allocation for future chip | |
730 | */ | |
731 | iommu->domain_ids = kcalloc(nlongs, sizeof(unsigned long), GFP_KERNEL); | |
732 | if (!iommu->domain_ids) { | |
733 | printk(KERN_ERR "Allocating domain id array failed\n"); | |
734 | return -ENOMEM; | |
735 | } | |
736 | iommu->domains = kcalloc(ndomains, sizeof(struct dmar_domain *), | |
737 | GFP_KERNEL); | |
738 | if (!iommu->domains) { | |
739 | printk(KERN_ERR "Allocating domain array failed\n"); | |
740 | kfree(iommu->domain_ids); | |
741 | return -ENOMEM; | |
742 | } | |
743 | ||
744 | /* | |
745 | * if Caching mode is set, then invalid translations are tagged | |
746 | * with domainid 0. Hence we need to pre-allocate it. | |
747 | */ | |
748 | if (cap_caching_mode(iommu->cap)) | |
749 | set_bit(0, iommu->domain_ids); | |
750 | return 0; | |
751 | } | |
752 | ||
753 | static struct intel_iommu *alloc_iommu(struct dmar_drhd_unit *drhd) | |
754 | { | |
755 | struct intel_iommu *iommu; | |
756 | int ret; | |
757 | int map_size; | |
758 | u32 ver; | |
759 | ||
760 | iommu = kzalloc(sizeof(*iommu), GFP_KERNEL); | |
761 | if (!iommu) | |
762 | return NULL; | |
763 | iommu->reg = ioremap(drhd->reg_base_addr, PAGE_SIZE_4K); | |
764 | if (!iommu->reg) { | |
765 | printk(KERN_ERR "IOMMU: can't map the region\n"); | |
766 | goto error; | |
767 | } | |
768 | iommu->cap = dmar_readq(iommu->reg + DMAR_CAP_REG); | |
769 | iommu->ecap = dmar_readq(iommu->reg + DMAR_ECAP_REG); | |
770 | ||
771 | /* the registers might be more than one page */ | |
772 | map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap), | |
773 | cap_max_fault_reg_offset(iommu->cap)); | |
774 | map_size = PAGE_ALIGN_4K(map_size); | |
775 | if (map_size > PAGE_SIZE_4K) { | |
776 | iounmap(iommu->reg); | |
777 | iommu->reg = ioremap(drhd->reg_base_addr, map_size); | |
778 | if (!iommu->reg) { | |
779 | printk(KERN_ERR "IOMMU: can't map the region\n"); | |
780 | goto error; | |
781 | } | |
782 | } | |
783 | ||
784 | ver = readl(iommu->reg + DMAR_VER_REG); | |
785 | pr_debug("IOMMU %llx: ver %d:%d cap %llx ecap %llx\n", | |
786 | drhd->reg_base_addr, DMAR_VER_MAJOR(ver), DMAR_VER_MINOR(ver), | |
787 | iommu->cap, iommu->ecap); | |
788 | ret = iommu_init_domains(iommu); | |
789 | if (ret) | |
790 | goto error_unmap; | |
791 | spin_lock_init(&iommu->lock); | |
792 | spin_lock_init(&iommu->register_lock); | |
793 | ||
794 | drhd->iommu = iommu; | |
795 | return iommu; | |
796 | error_unmap: | |
797 | iounmap(iommu->reg); | |
798 | iommu->reg = 0; | |
799 | error: | |
800 | kfree(iommu); | |
801 | return NULL; | |
802 | } | |
803 | ||
804 | static void domain_exit(struct dmar_domain *domain); | |
805 | static void free_iommu(struct intel_iommu *iommu) | |
806 | { | |
807 | struct dmar_domain *domain; | |
808 | int i; | |
809 | ||
810 | if (!iommu) | |
811 | return; | |
812 | ||
813 | i = find_first_bit(iommu->domain_ids, cap_ndoms(iommu->cap)); | |
814 | for (; i < cap_ndoms(iommu->cap); ) { | |
815 | domain = iommu->domains[i]; | |
816 | clear_bit(i, iommu->domain_ids); | |
817 | domain_exit(domain); | |
818 | i = find_next_bit(iommu->domain_ids, | |
819 | cap_ndoms(iommu->cap), i+1); | |
820 | } | |
821 | ||
822 | if (iommu->gcmd & DMA_GCMD_TE) | |
823 | iommu_disable_translation(iommu); | |
824 | ||
825 | if (iommu->irq) { | |
826 | set_irq_data(iommu->irq, NULL); | |
827 | /* This will mask the irq */ | |
828 | free_irq(iommu->irq, iommu); | |
829 | destroy_irq(iommu->irq); | |
830 | } | |
831 | ||
832 | kfree(iommu->domains); | |
833 | kfree(iommu->domain_ids); | |
834 | ||
835 | /* free context mapping */ | |
836 | free_context_table(iommu); | |
837 | ||
838 | if (iommu->reg) | |
839 | iounmap(iommu->reg); | |
840 | kfree(iommu); | |
841 | } | |
842 | ||
843 | static struct dmar_domain * iommu_alloc_domain(struct intel_iommu *iommu) | |
844 | { | |
845 | unsigned long num; | |
846 | unsigned long ndomains; | |
847 | struct dmar_domain *domain; | |
848 | unsigned long flags; | |
849 | ||
850 | domain = alloc_domain_mem(); | |
851 | if (!domain) | |
852 | return NULL; | |
853 | ||
854 | ndomains = cap_ndoms(iommu->cap); | |
855 | ||
856 | spin_lock_irqsave(&iommu->lock, flags); | |
857 | num = find_first_zero_bit(iommu->domain_ids, ndomains); | |
858 | if (num >= ndomains) { | |
859 | spin_unlock_irqrestore(&iommu->lock, flags); | |
860 | free_domain_mem(domain); | |
861 | printk(KERN_ERR "IOMMU: no free domain ids\n"); | |
862 | return NULL; | |
863 | } | |
864 | ||
865 | set_bit(num, iommu->domain_ids); | |
866 | domain->id = num; | |
867 | domain->iommu = iommu; | |
868 | iommu->domains[num] = domain; | |
869 | spin_unlock_irqrestore(&iommu->lock, flags); | |
870 | ||
871 | return domain; | |
872 | } | |
873 | ||
874 | static void iommu_free_domain(struct dmar_domain *domain) | |
875 | { | |
876 | unsigned long flags; | |
877 | ||
878 | spin_lock_irqsave(&domain->iommu->lock, flags); | |
879 | clear_bit(domain->id, domain->iommu->domain_ids); | |
880 | spin_unlock_irqrestore(&domain->iommu->lock, flags); | |
881 | } | |
882 | ||
883 | static struct iova_domain reserved_iova_list; | |
884 | ||
885 | static void dmar_init_reserved_ranges(void) | |
886 | { | |
887 | struct pci_dev *pdev = NULL; | |
888 | struct iova *iova; | |
889 | int i; | |
890 | u64 addr, size; | |
891 | ||
892 | init_iova_domain(&reserved_iova_list); | |
893 | ||
894 | /* IOAPIC ranges shouldn't be accessed by DMA */ | |
895 | iova = reserve_iova(&reserved_iova_list, IOVA_PFN(IOAPIC_RANGE_START), | |
896 | IOVA_PFN(IOAPIC_RANGE_END)); | |
897 | if (!iova) | |
898 | printk(KERN_ERR "Reserve IOAPIC range failed\n"); | |
899 | ||
900 | /* Reserve all PCI MMIO to avoid peer-to-peer access */ | |
901 | for_each_pci_dev(pdev) { | |
902 | struct resource *r; | |
903 | ||
904 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { | |
905 | r = &pdev->resource[i]; | |
906 | if (!r->flags || !(r->flags & IORESOURCE_MEM)) | |
907 | continue; | |
908 | addr = r->start; | |
909 | addr &= PAGE_MASK_4K; | |
910 | size = r->end - addr; | |
911 | size = PAGE_ALIGN_4K(size); | |
912 | iova = reserve_iova(&reserved_iova_list, IOVA_PFN(addr), | |
913 | IOVA_PFN(size + addr) - 1); | |
914 | if (!iova) | |
915 | printk(KERN_ERR "Reserve iova failed\n"); | |
916 | } | |
917 | } | |
918 | ||
919 | } | |
920 | ||
921 | static void domain_reserve_special_ranges(struct dmar_domain *domain) | |
922 | { | |
923 | copy_reserved_iova(&reserved_iova_list, &domain->iovad); | |
924 | } | |
925 | ||
926 | static inline int guestwidth_to_adjustwidth(int gaw) | |
927 | { | |
928 | int agaw; | |
929 | int r = (gaw - 12) % 9; | |
930 | ||
931 | if (r == 0) | |
932 | agaw = gaw; | |
933 | else | |
934 | agaw = gaw + 9 - r; | |
935 | if (agaw > 64) | |
936 | agaw = 64; | |
937 | return agaw; | |
938 | } | |
939 | ||
940 | static int domain_init(struct dmar_domain *domain, int guest_width) | |
941 | { | |
942 | struct intel_iommu *iommu; | |
943 | int adjust_width, agaw; | |
944 | unsigned long sagaw; | |
945 | ||
946 | init_iova_domain(&domain->iovad); | |
947 | spin_lock_init(&domain->mapping_lock); | |
948 | ||
949 | domain_reserve_special_ranges(domain); | |
950 | ||
951 | /* calculate AGAW */ | |
952 | iommu = domain->iommu; | |
953 | if (guest_width > cap_mgaw(iommu->cap)) | |
954 | guest_width = cap_mgaw(iommu->cap); | |
955 | domain->gaw = guest_width; | |
956 | adjust_width = guestwidth_to_adjustwidth(guest_width); | |
957 | agaw = width_to_agaw(adjust_width); | |
958 | sagaw = cap_sagaw(iommu->cap); | |
959 | if (!test_bit(agaw, &sagaw)) { | |
960 | /* hardware doesn't support it, choose a bigger one */ | |
961 | pr_debug("IOMMU: hardware doesn't support agaw %d\n", agaw); | |
962 | agaw = find_next_bit(&sagaw, 5, agaw); | |
963 | if (agaw >= 5) | |
964 | return -ENODEV; | |
965 | } | |
966 | domain->agaw = agaw; | |
967 | INIT_LIST_HEAD(&domain->devices); | |
968 | ||
969 | /* always allocate the top pgd */ | |
970 | domain->pgd = (struct dma_pte *)alloc_pgtable_page(); | |
971 | if (!domain->pgd) | |
972 | return -ENOMEM; | |
973 | __iommu_flush_cache(iommu, domain->pgd, PAGE_SIZE_4K); | |
974 | return 0; | |
975 | } | |
976 | ||
977 | static void domain_exit(struct dmar_domain *domain) | |
978 | { | |
979 | u64 end; | |
980 | ||
981 | /* Domain 0 is reserved, so dont process it */ | |
982 | if (!domain) | |
983 | return; | |
984 | ||
985 | domain_remove_dev_info(domain); | |
986 | /* destroy iovas */ | |
987 | put_iova_domain(&domain->iovad); | |
988 | end = DOMAIN_MAX_ADDR(domain->gaw); | |
989 | end = end & (~PAGE_MASK_4K); | |
990 | ||
991 | /* clear ptes */ | |
992 | dma_pte_clear_range(domain, 0, end); | |
993 | ||
994 | /* free page tables */ | |
995 | dma_pte_free_pagetable(domain, 0, end); | |
996 | ||
997 | iommu_free_domain(domain); | |
998 | free_domain_mem(domain); | |
999 | } | |
1000 | ||
1001 | static int domain_context_mapping_one(struct dmar_domain *domain, | |
1002 | u8 bus, u8 devfn) | |
1003 | { | |
1004 | struct context_entry *context; | |
1005 | struct intel_iommu *iommu = domain->iommu; | |
1006 | unsigned long flags; | |
1007 | ||
1008 | pr_debug("Set context mapping for %02x:%02x.%d\n", | |
1009 | bus, PCI_SLOT(devfn), PCI_FUNC(devfn)); | |
1010 | BUG_ON(!domain->pgd); | |
1011 | context = device_to_context_entry(iommu, bus, devfn); | |
1012 | if (!context) | |
1013 | return -ENOMEM; | |
1014 | spin_lock_irqsave(&iommu->lock, flags); | |
1015 | if (context_present(*context)) { | |
1016 | spin_unlock_irqrestore(&iommu->lock, flags); | |
1017 | return 0; | |
1018 | } | |
1019 | ||
1020 | context_set_domain_id(*context, domain->id); | |
1021 | context_set_address_width(*context, domain->agaw); | |
1022 | context_set_address_root(*context, virt_to_phys(domain->pgd)); | |
1023 | context_set_translation_type(*context, CONTEXT_TT_MULTI_LEVEL); | |
1024 | context_set_fault_enable(*context); | |
1025 | context_set_present(*context); | |
1026 | __iommu_flush_cache(iommu, context, sizeof(*context)); | |
1027 | ||
1028 | /* it's a non-present to present mapping */ | |
1029 | if (iommu_flush_context_device(iommu, domain->id, | |
1030 | (((u16)bus) << 8) | devfn, DMA_CCMD_MASK_NOBIT, 1)) | |
1031 | iommu_flush_write_buffer(iommu); | |
1032 | else | |
1033 | iommu_flush_iotlb_dsi(iommu, 0, 0); | |
1034 | spin_unlock_irqrestore(&iommu->lock, flags); | |
1035 | return 0; | |
1036 | } | |
1037 | ||
1038 | static int | |
1039 | domain_context_mapping(struct dmar_domain *domain, struct pci_dev *pdev) | |
1040 | { | |
1041 | int ret; | |
1042 | struct pci_dev *tmp, *parent; | |
1043 | ||
1044 | ret = domain_context_mapping_one(domain, pdev->bus->number, | |
1045 | pdev->devfn); | |
1046 | if (ret) | |
1047 | return ret; | |
1048 | ||
1049 | /* dependent device mapping */ | |
1050 | tmp = pci_find_upstream_pcie_bridge(pdev); | |
1051 | if (!tmp) | |
1052 | return 0; | |
1053 | /* Secondary interface's bus number and devfn 0 */ | |
1054 | parent = pdev->bus->self; | |
1055 | while (parent != tmp) { | |
1056 | ret = domain_context_mapping_one(domain, parent->bus->number, | |
1057 | parent->devfn); | |
1058 | if (ret) | |
1059 | return ret; | |
1060 | parent = parent->bus->self; | |
1061 | } | |
1062 | if (tmp->is_pcie) /* this is a PCIE-to-PCI bridge */ | |
1063 | return domain_context_mapping_one(domain, | |
1064 | tmp->subordinate->number, 0); | |
1065 | else /* this is a legacy PCI bridge */ | |
1066 | return domain_context_mapping_one(domain, | |
1067 | tmp->bus->number, tmp->devfn); | |
1068 | } | |
1069 | ||
1070 | static int domain_context_mapped(struct dmar_domain *domain, | |
1071 | struct pci_dev *pdev) | |
1072 | { | |
1073 | int ret; | |
1074 | struct pci_dev *tmp, *parent; | |
1075 | ||
1076 | ret = device_context_mapped(domain->iommu, | |
1077 | pdev->bus->number, pdev->devfn); | |
1078 | if (!ret) | |
1079 | return ret; | |
1080 | /* dependent device mapping */ | |
1081 | tmp = pci_find_upstream_pcie_bridge(pdev); | |
1082 | if (!tmp) | |
1083 | return ret; | |
1084 | /* Secondary interface's bus number and devfn 0 */ | |
1085 | parent = pdev->bus->self; | |
1086 | while (parent != tmp) { | |
1087 | ret = device_context_mapped(domain->iommu, parent->bus->number, | |
1088 | parent->devfn); | |
1089 | if (!ret) | |
1090 | return ret; | |
1091 | parent = parent->bus->self; | |
1092 | } | |
1093 | if (tmp->is_pcie) | |
1094 | return device_context_mapped(domain->iommu, | |
1095 | tmp->subordinate->number, 0); | |
1096 | else | |
1097 | return device_context_mapped(domain->iommu, | |
1098 | tmp->bus->number, tmp->devfn); | |
1099 | } | |
1100 | ||
1101 | static int | |
1102 | domain_page_mapping(struct dmar_domain *domain, dma_addr_t iova, | |
1103 | u64 hpa, size_t size, int prot) | |
1104 | { | |
1105 | u64 start_pfn, end_pfn; | |
1106 | struct dma_pte *pte; | |
1107 | int index; | |
1108 | ||
1109 | if ((prot & (DMA_PTE_READ|DMA_PTE_WRITE)) == 0) | |
1110 | return -EINVAL; | |
1111 | iova &= PAGE_MASK_4K; | |
1112 | start_pfn = ((u64)hpa) >> PAGE_SHIFT_4K; | |
1113 | end_pfn = (PAGE_ALIGN_4K(((u64)hpa) + size)) >> PAGE_SHIFT_4K; | |
1114 | index = 0; | |
1115 | while (start_pfn < end_pfn) { | |
1116 | pte = addr_to_dma_pte(domain, iova + PAGE_SIZE_4K * index); | |
1117 | if (!pte) | |
1118 | return -ENOMEM; | |
1119 | /* We don't need lock here, nobody else | |
1120 | * touches the iova range | |
1121 | */ | |
1122 | BUG_ON(dma_pte_addr(*pte)); | |
1123 | dma_set_pte_addr(*pte, start_pfn << PAGE_SHIFT_4K); | |
1124 | dma_set_pte_prot(*pte, prot); | |
1125 | __iommu_flush_cache(domain->iommu, pte, sizeof(*pte)); | |
1126 | start_pfn++; | |
1127 | index++; | |
1128 | } | |
1129 | return 0; | |
1130 | } | |
1131 | ||
1132 | static void detach_domain_for_dev(struct dmar_domain *domain, u8 bus, u8 devfn) | |
1133 | { | |
1134 | clear_context_table(domain->iommu, bus, devfn); | |
1135 | iommu_flush_context_global(domain->iommu, 0); | |
1136 | iommu_flush_iotlb_global(domain->iommu, 0); | |
1137 | } | |
1138 | ||
1139 | static void domain_remove_dev_info(struct dmar_domain *domain) | |
1140 | { | |
1141 | struct device_domain_info *info; | |
1142 | unsigned long flags; | |
1143 | ||
1144 | spin_lock_irqsave(&device_domain_lock, flags); | |
1145 | while (!list_empty(&domain->devices)) { | |
1146 | info = list_entry(domain->devices.next, | |
1147 | struct device_domain_info, link); | |
1148 | list_del(&info->link); | |
1149 | list_del(&info->global); | |
1150 | if (info->dev) | |
1151 | info->dev->sysdata = NULL; | |
1152 | spin_unlock_irqrestore(&device_domain_lock, flags); | |
1153 | ||
1154 | detach_domain_for_dev(info->domain, info->bus, info->devfn); | |
1155 | free_devinfo_mem(info); | |
1156 | ||
1157 | spin_lock_irqsave(&device_domain_lock, flags); | |
1158 | } | |
1159 | spin_unlock_irqrestore(&device_domain_lock, flags); | |
1160 | } | |
1161 | ||
1162 | /* | |
1163 | * find_domain | |
1164 | * Note: we use struct pci_dev->sysdata stores the info | |
1165 | */ | |
1166 | struct dmar_domain * | |
1167 | find_domain(struct pci_dev *pdev) | |
1168 | { | |
1169 | struct device_domain_info *info; | |
1170 | ||
1171 | /* No lock here, assumes no domain exit in normal case */ | |
1172 | info = pdev->sysdata; | |
1173 | if (info) | |
1174 | return info->domain; | |
1175 | return NULL; | |
1176 | } | |
1177 | ||
1178 | static int dmar_pci_device_match(struct pci_dev *devices[], int cnt, | |
1179 | struct pci_dev *dev) | |
1180 | { | |
1181 | int index; | |
1182 | ||
1183 | while (dev) { | |
1184 | for (index = 0; index < cnt; index ++) | |
1185 | if (dev == devices[index]) | |
1186 | return 1; | |
1187 | ||
1188 | /* Check our parent */ | |
1189 | dev = dev->bus->self; | |
1190 | } | |
1191 | ||
1192 | return 0; | |
1193 | } | |
1194 | ||
1195 | static struct dmar_drhd_unit * | |
1196 | dmar_find_matched_drhd_unit(struct pci_dev *dev) | |
1197 | { | |
1198 | struct dmar_drhd_unit *drhd = NULL; | |
1199 | ||
1200 | list_for_each_entry(drhd, &dmar_drhd_units, list) { | |
1201 | if (drhd->include_all || dmar_pci_device_match(drhd->devices, | |
1202 | drhd->devices_cnt, dev)) | |
1203 | return drhd; | |
1204 | } | |
1205 | ||
1206 | return NULL; | |
1207 | } | |
1208 | ||
1209 | /* domain is initialized */ | |
1210 | static struct dmar_domain *get_domain_for_dev(struct pci_dev *pdev, int gaw) | |
1211 | { | |
1212 | struct dmar_domain *domain, *found = NULL; | |
1213 | struct intel_iommu *iommu; | |
1214 | struct dmar_drhd_unit *drhd; | |
1215 | struct device_domain_info *info, *tmp; | |
1216 | struct pci_dev *dev_tmp; | |
1217 | unsigned long flags; | |
1218 | int bus = 0, devfn = 0; | |
1219 | ||
1220 | domain = find_domain(pdev); | |
1221 | if (domain) | |
1222 | return domain; | |
1223 | ||
1224 | dev_tmp = pci_find_upstream_pcie_bridge(pdev); | |
1225 | if (dev_tmp) { | |
1226 | if (dev_tmp->is_pcie) { | |
1227 | bus = dev_tmp->subordinate->number; | |
1228 | devfn = 0; | |
1229 | } else { | |
1230 | bus = dev_tmp->bus->number; | |
1231 | devfn = dev_tmp->devfn; | |
1232 | } | |
1233 | spin_lock_irqsave(&device_domain_lock, flags); | |
1234 | list_for_each_entry(info, &device_domain_list, global) { | |
1235 | if (info->bus == bus && info->devfn == devfn) { | |
1236 | found = info->domain; | |
1237 | break; | |
1238 | } | |
1239 | } | |
1240 | spin_unlock_irqrestore(&device_domain_lock, flags); | |
1241 | /* pcie-pci bridge already has a domain, uses it */ | |
1242 | if (found) { | |
1243 | domain = found; | |
1244 | goto found_domain; | |
1245 | } | |
1246 | } | |
1247 | ||
1248 | /* Allocate new domain for the device */ | |
1249 | drhd = dmar_find_matched_drhd_unit(pdev); | |
1250 | if (!drhd) { | |
1251 | printk(KERN_ERR "IOMMU: can't find DMAR for device %s\n", | |
1252 | pci_name(pdev)); | |
1253 | return NULL; | |
1254 | } | |
1255 | iommu = drhd->iommu; | |
1256 | ||
1257 | domain = iommu_alloc_domain(iommu); | |
1258 | if (!domain) | |
1259 | goto error; | |
1260 | ||
1261 | if (domain_init(domain, gaw)) { | |
1262 | domain_exit(domain); | |
1263 | goto error; | |
1264 | } | |
1265 | ||
1266 | /* register pcie-to-pci device */ | |
1267 | if (dev_tmp) { | |
1268 | info = alloc_devinfo_mem(); | |
1269 | if (!info) { | |
1270 | domain_exit(domain); | |
1271 | goto error; | |
1272 | } | |
1273 | info->bus = bus; | |
1274 | info->devfn = devfn; | |
1275 | info->dev = NULL; | |
1276 | info->domain = domain; | |
1277 | /* This domain is shared by devices under p2p bridge */ | |
1278 | domain->flags |= DOMAIN_FLAG_MULTIPLE_DEVICES; | |
1279 | ||
1280 | /* pcie-to-pci bridge already has a domain, uses it */ | |
1281 | found = NULL; | |
1282 | spin_lock_irqsave(&device_domain_lock, flags); | |
1283 | list_for_each_entry(tmp, &device_domain_list, global) { | |
1284 | if (tmp->bus == bus && tmp->devfn == devfn) { | |
1285 | found = tmp->domain; | |
1286 | break; | |
1287 | } | |
1288 | } | |
1289 | if (found) { | |
1290 | free_devinfo_mem(info); | |
1291 | domain_exit(domain); | |
1292 | domain = found; | |
1293 | } else { | |
1294 | list_add(&info->link, &domain->devices); | |
1295 | list_add(&info->global, &device_domain_list); | |
1296 | } | |
1297 | spin_unlock_irqrestore(&device_domain_lock, flags); | |
1298 | } | |
1299 | ||
1300 | found_domain: | |
1301 | info = alloc_devinfo_mem(); | |
1302 | if (!info) | |
1303 | goto error; | |
1304 | info->bus = pdev->bus->number; | |
1305 | info->devfn = pdev->devfn; | |
1306 | info->dev = pdev; | |
1307 | info->domain = domain; | |
1308 | spin_lock_irqsave(&device_domain_lock, flags); | |
1309 | /* somebody is fast */ | |
1310 | found = find_domain(pdev); | |
1311 | if (found != NULL) { | |
1312 | spin_unlock_irqrestore(&device_domain_lock, flags); | |
1313 | if (found != domain) { | |
1314 | domain_exit(domain); | |
1315 | domain = found; | |
1316 | } | |
1317 | free_devinfo_mem(info); | |
1318 | return domain; | |
1319 | } | |
1320 | list_add(&info->link, &domain->devices); | |
1321 | list_add(&info->global, &device_domain_list); | |
1322 | pdev->sysdata = info; | |
1323 | spin_unlock_irqrestore(&device_domain_lock, flags); | |
1324 | return domain; | |
1325 | error: | |
1326 | /* recheck it here, maybe others set it */ | |
1327 | return find_domain(pdev); | |
1328 | } | |
1329 | ||
1330 | static int iommu_prepare_identity_map(struct pci_dev *pdev, u64 start, u64 end) | |
1331 | { | |
1332 | struct dmar_domain *domain; | |
1333 | unsigned long size; | |
1334 | u64 base; | |
1335 | int ret; | |
1336 | ||
1337 | printk(KERN_INFO | |
1338 | "IOMMU: Setting identity map for device %s [0x%Lx - 0x%Lx]\n", | |
1339 | pci_name(pdev), start, end); | |
1340 | /* page table init */ | |
1341 | domain = get_domain_for_dev(pdev, DEFAULT_DOMAIN_ADDRESS_WIDTH); | |
1342 | if (!domain) | |
1343 | return -ENOMEM; | |
1344 | ||
1345 | /* The address might not be aligned */ | |
1346 | base = start & PAGE_MASK_4K; | |
1347 | size = end - base; | |
1348 | size = PAGE_ALIGN_4K(size); | |
1349 | if (!reserve_iova(&domain->iovad, IOVA_PFN(base), | |
1350 | IOVA_PFN(base + size) - 1)) { | |
1351 | printk(KERN_ERR "IOMMU: reserve iova failed\n"); | |
1352 | ret = -ENOMEM; | |
1353 | goto error; | |
1354 | } | |
1355 | ||
1356 | pr_debug("Mapping reserved region %lx@%llx for %s\n", | |
1357 | size, base, pci_name(pdev)); | |
1358 | /* | |
1359 | * RMRR range might have overlap with physical memory range, | |
1360 | * clear it first | |
1361 | */ | |
1362 | dma_pte_clear_range(domain, base, base + size); | |
1363 | ||
1364 | ret = domain_page_mapping(domain, base, base, size, | |
1365 | DMA_PTE_READ|DMA_PTE_WRITE); | |
1366 | if (ret) | |
1367 | goto error; | |
1368 | ||
1369 | /* context entry init */ | |
1370 | ret = domain_context_mapping(domain, pdev); | |
1371 | if (!ret) | |
1372 | return 0; | |
1373 | error: | |
1374 | domain_exit(domain); | |
1375 | return ret; | |
1376 | ||
1377 | } | |
1378 | ||
1379 | static inline int iommu_prepare_rmrr_dev(struct dmar_rmrr_unit *rmrr, | |
1380 | struct pci_dev *pdev) | |
1381 | { | |
1382 | if (pdev->sysdata == DUMMY_DEVICE_DOMAIN_INFO) | |
1383 | return 0; | |
1384 | return iommu_prepare_identity_map(pdev, rmrr->base_address, | |
1385 | rmrr->end_address + 1); | |
1386 | } | |
1387 | ||
1388 | int __init init_dmars(void) | |
1389 | { | |
1390 | struct dmar_drhd_unit *drhd; | |
1391 | struct dmar_rmrr_unit *rmrr; | |
1392 | struct pci_dev *pdev; | |
1393 | struct intel_iommu *iommu; | |
1394 | int ret, unit = 0; | |
1395 | ||
1396 | /* | |
1397 | * for each drhd | |
1398 | * allocate root | |
1399 | * initialize and program root entry to not present | |
1400 | * endfor | |
1401 | */ | |
1402 | for_each_drhd_unit(drhd) { | |
1403 | if (drhd->ignored) | |
1404 | continue; | |
1405 | iommu = alloc_iommu(drhd); | |
1406 | if (!iommu) { | |
1407 | ret = -ENOMEM; | |
1408 | goto error; | |
1409 | } | |
1410 | ||
1411 | /* | |
1412 | * TBD: | |
1413 | * we could share the same root & context tables | |
1414 | * amoung all IOMMU's. Need to Split it later. | |
1415 | */ | |
1416 | ret = iommu_alloc_root_entry(iommu); | |
1417 | if (ret) { | |
1418 | printk(KERN_ERR "IOMMU: allocate root entry failed\n"); | |
1419 | goto error; | |
1420 | } | |
1421 | } | |
1422 | ||
1423 | /* | |
1424 | * For each rmrr | |
1425 | * for each dev attached to rmrr | |
1426 | * do | |
1427 | * locate drhd for dev, alloc domain for dev | |
1428 | * allocate free domain | |
1429 | * allocate page table entries for rmrr | |
1430 | * if context not allocated for bus | |
1431 | * allocate and init context | |
1432 | * set present in root table for this bus | |
1433 | * init context with domain, translation etc | |
1434 | * endfor | |
1435 | * endfor | |
1436 | */ | |
1437 | for_each_rmrr_units(rmrr) { | |
1438 | int i; | |
1439 | for (i = 0; i < rmrr->devices_cnt; i++) { | |
1440 | pdev = rmrr->devices[i]; | |
1441 | /* some BIOS lists non-exist devices in DMAR table */ | |
1442 | if (!pdev) | |
1443 | continue; | |
1444 | ret = iommu_prepare_rmrr_dev(rmrr, pdev); | |
1445 | if (ret) | |
1446 | printk(KERN_ERR | |
1447 | "IOMMU: mapping reserved region failed\n"); | |
1448 | } | |
1449 | } | |
1450 | ||
1451 | /* | |
1452 | * for each drhd | |
1453 | * enable fault log | |
1454 | * global invalidate context cache | |
1455 | * global invalidate iotlb | |
1456 | * enable translation | |
1457 | */ | |
1458 | for_each_drhd_unit(drhd) { | |
1459 | if (drhd->ignored) | |
1460 | continue; | |
1461 | iommu = drhd->iommu; | |
1462 | sprintf (iommu->name, "dmar%d", unit++); | |
1463 | ||
1464 | iommu_flush_write_buffer(iommu); | |
1465 | ||
1466 | iommu_set_root_entry(iommu); | |
1467 | ||
1468 | iommu_flush_context_global(iommu, 0); | |
1469 | iommu_flush_iotlb_global(iommu, 0); | |
1470 | ||
1471 | ret = iommu_enable_translation(iommu); | |
1472 | if (ret) | |
1473 | goto error; | |
1474 | } | |
1475 | ||
1476 | return 0; | |
1477 | error: | |
1478 | for_each_drhd_unit(drhd) { | |
1479 | if (drhd->ignored) | |
1480 | continue; | |
1481 | iommu = drhd->iommu; | |
1482 | free_iommu(iommu); | |
1483 | } | |
1484 | return ret; | |
1485 | } | |
1486 | ||
1487 | static inline u64 aligned_size(u64 host_addr, size_t size) | |
1488 | { | |
1489 | u64 addr; | |
1490 | addr = (host_addr & (~PAGE_MASK_4K)) + size; | |
1491 | return PAGE_ALIGN_4K(addr); | |
1492 | } | |
1493 | ||
1494 | struct iova * | |
1495 | iommu_alloc_iova(struct dmar_domain *domain, void *host_addr, size_t size, | |
1496 | u64 start, u64 end) | |
1497 | { | |
1498 | u64 start_addr; | |
1499 | struct iova *piova; | |
1500 | ||
1501 | /* Make sure it's in range */ | |
1502 | if ((start > DOMAIN_MAX_ADDR(domain->gaw)) || end < start) | |
1503 | return NULL; | |
1504 | ||
1505 | end = min_t(u64, DOMAIN_MAX_ADDR(domain->gaw), end); | |
1506 | start_addr = PAGE_ALIGN_4K(start); | |
1507 | size = aligned_size((u64)host_addr, size); | |
1508 | if (!size || (start_addr + size > end)) | |
1509 | return NULL; | |
1510 | ||
1511 | piova = alloc_iova(&domain->iovad, | |
1512 | size >> PAGE_SHIFT_4K, IOVA_PFN(end)); | |
1513 | ||
1514 | return piova; | |
1515 | } | |
1516 | ||
1517 | static dma_addr_t __intel_map_single(struct device *dev, void *addr, | |
1518 | size_t size, int dir, u64 *flush_addr, unsigned int *flush_size) | |
1519 | { | |
1520 | struct dmar_domain *domain; | |
1521 | struct pci_dev *pdev = to_pci_dev(dev); | |
1522 | int ret; | |
1523 | int prot = 0; | |
1524 | struct iova *iova = NULL; | |
1525 | u64 start_addr; | |
1526 | ||
1527 | addr = (void *)virt_to_phys(addr); | |
1528 | ||
1529 | domain = get_domain_for_dev(pdev, | |
1530 | DEFAULT_DOMAIN_ADDRESS_WIDTH); | |
1531 | if (!domain) { | |
1532 | printk(KERN_ERR | |
1533 | "Allocating domain for %s failed", pci_name(pdev)); | |
1534 | return 0; | |
1535 | } | |
1536 | ||
1537 | start_addr = IOVA_START_ADDR; | |
1538 | ||
1539 | if (pdev->dma_mask <= DMA_32BIT_MASK) { | |
1540 | iova = iommu_alloc_iova(domain, addr, size, start_addr, | |
1541 | pdev->dma_mask); | |
1542 | } else { | |
1543 | /* | |
1544 | * First try to allocate an io virtual address in | |
1545 | * DMA_32BIT_MASK and if that fails then try allocating | |
1546 | * from higer range | |
1547 | */ | |
1548 | iova = iommu_alloc_iova(domain, addr, size, start_addr, | |
1549 | DMA_32BIT_MASK); | |
1550 | if (!iova) | |
1551 | iova = iommu_alloc_iova(domain, addr, size, start_addr, | |
1552 | pdev->dma_mask); | |
1553 | } | |
1554 | ||
1555 | if (!iova) { | |
1556 | printk(KERN_ERR"Allocating iova for %s failed", pci_name(pdev)); | |
1557 | return 0; | |
1558 | } | |
1559 | ||
1560 | /* make sure context mapping is ok */ | |
1561 | if (unlikely(!domain_context_mapped(domain, pdev))) { | |
1562 | ret = domain_context_mapping(domain, pdev); | |
1563 | if (ret) | |
1564 | goto error; | |
1565 | } | |
1566 | ||
1567 | /* | |
1568 | * Check if DMAR supports zero-length reads on write only | |
1569 | * mappings.. | |
1570 | */ | |
1571 | if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL || \ | |
1572 | !cap_zlr(domain->iommu->cap)) | |
1573 | prot |= DMA_PTE_READ; | |
1574 | if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) | |
1575 | prot |= DMA_PTE_WRITE; | |
1576 | /* | |
1577 | * addr - (addr + size) might be partial page, we should map the whole | |
1578 | * page. Note: if two part of one page are separately mapped, we | |
1579 | * might have two guest_addr mapping to the same host addr, but this | |
1580 | * is not a big problem | |
1581 | */ | |
1582 | ret = domain_page_mapping(domain, iova->pfn_lo << PAGE_SHIFT_4K, | |
1583 | ((u64)addr) & PAGE_MASK_4K, | |
1584 | (iova->pfn_hi - iova->pfn_lo + 1) << PAGE_SHIFT_4K, prot); | |
1585 | if (ret) | |
1586 | goto error; | |
1587 | ||
1588 | pr_debug("Device %s request: %lx@%llx mapping: %lx@%llx, dir %d\n", | |
1589 | pci_name(pdev), size, (u64)addr, | |
1590 | (iova->pfn_hi - iova->pfn_lo + 1) << PAGE_SHIFT_4K, | |
1591 | (u64)(iova->pfn_lo << PAGE_SHIFT_4K), dir); | |
1592 | ||
1593 | *flush_addr = iova->pfn_lo << PAGE_SHIFT_4K; | |
1594 | *flush_size = (iova->pfn_hi - iova->pfn_lo + 1) << PAGE_SHIFT_4K; | |
1595 | return (iova->pfn_lo << PAGE_SHIFT_4K) + ((u64)addr & (~PAGE_MASK_4K)); | |
1596 | error: | |
1597 | __free_iova(&domain->iovad, iova); | |
1598 | printk(KERN_ERR"Device %s request: %lx@%llx dir %d --- failed\n", | |
1599 | pci_name(pdev), size, (u64)addr, dir); | |
1600 | return 0; | |
1601 | } | |
1602 | ||
1603 | static dma_addr_t intel_map_single(struct device *hwdev, void *addr, | |
1604 | size_t size, int dir) | |
1605 | { | |
1606 | struct pci_dev *pdev = to_pci_dev(hwdev); | |
1607 | dma_addr_t ret; | |
1608 | struct dmar_domain *domain; | |
1609 | u64 flush_addr; | |
1610 | unsigned int flush_size; | |
1611 | ||
1612 | BUG_ON(dir == DMA_NONE); | |
1613 | if (pdev->sysdata == DUMMY_DEVICE_DOMAIN_INFO) | |
1614 | return virt_to_bus(addr); | |
1615 | ||
1616 | ret = __intel_map_single(hwdev, addr, size, | |
1617 | dir, &flush_addr, &flush_size); | |
1618 | if (ret) { | |
1619 | domain = find_domain(pdev); | |
1620 | /* it's a non-present to present mapping */ | |
1621 | if (iommu_flush_iotlb_psi(domain->iommu, domain->id, | |
1622 | flush_addr, flush_size >> PAGE_SHIFT_4K, 1)) | |
1623 | iommu_flush_write_buffer(domain->iommu); | |
1624 | } | |
1625 | return ret; | |
1626 | } | |
1627 | ||
1628 | static void __intel_unmap_single(struct device *dev, dma_addr_t dev_addr, | |
1629 | size_t size, int dir, u64 *flush_addr, unsigned int *flush_size) | |
1630 | { | |
1631 | struct dmar_domain *domain; | |
1632 | struct pci_dev *pdev = to_pci_dev(dev); | |
1633 | struct iova *iova; | |
1634 | ||
1635 | domain = find_domain(pdev); | |
1636 | BUG_ON(!domain); | |
1637 | ||
1638 | iova = find_iova(&domain->iovad, IOVA_PFN(dev_addr)); | |
1639 | if (!iova) { | |
1640 | *flush_size = 0; | |
1641 | return; | |
1642 | } | |
1643 | pr_debug("Device %s unmapping: %lx@%llx\n", | |
1644 | pci_name(pdev), | |
1645 | (iova->pfn_hi - iova->pfn_lo + 1) << PAGE_SHIFT_4K, | |
1646 | (u64)(iova->pfn_lo << PAGE_SHIFT_4K)); | |
1647 | ||
1648 | *flush_addr = iova->pfn_lo << PAGE_SHIFT_4K; | |
1649 | *flush_size = (iova->pfn_hi - iova->pfn_lo + 1) << PAGE_SHIFT_4K; | |
1650 | /* clear the whole page, not just dev_addr - (dev_addr + size) */ | |
1651 | dma_pte_clear_range(domain, *flush_addr, *flush_addr + *flush_size); | |
1652 | /* free page tables */ | |
1653 | dma_pte_free_pagetable(domain, *flush_addr, *flush_addr + *flush_size); | |
1654 | /* free iova */ | |
1655 | __free_iova(&domain->iovad, iova); | |
1656 | } | |
1657 | ||
1658 | static void intel_unmap_single(struct device *dev, dma_addr_t dev_addr, | |
1659 | size_t size, int dir) | |
1660 | { | |
1661 | struct pci_dev *pdev = to_pci_dev(dev); | |
1662 | struct dmar_domain *domain; | |
1663 | u64 flush_addr; | |
1664 | unsigned int flush_size; | |
1665 | ||
1666 | if (pdev->sysdata == DUMMY_DEVICE_DOMAIN_INFO) | |
1667 | return; | |
1668 | ||
1669 | domain = find_domain(pdev); | |
1670 | __intel_unmap_single(dev, dev_addr, size, | |
1671 | dir, &flush_addr, &flush_size); | |
1672 | if (flush_size == 0) | |
1673 | return; | |
1674 | if (iommu_flush_iotlb_psi(domain->iommu, domain->id, flush_addr, | |
1675 | flush_size >> PAGE_SHIFT_4K, 0)) | |
1676 | iommu_flush_write_buffer(domain->iommu); | |
1677 | } | |
1678 | ||
1679 | static void * intel_alloc_coherent(struct device *hwdev, size_t size, | |
1680 | dma_addr_t *dma_handle, gfp_t flags) | |
1681 | { | |
1682 | void *vaddr; | |
1683 | int order; | |
1684 | ||
1685 | size = PAGE_ALIGN_4K(size); | |
1686 | order = get_order(size); | |
1687 | flags &= ~(GFP_DMA | GFP_DMA32); | |
1688 | ||
1689 | vaddr = (void *)__get_free_pages(flags, order); | |
1690 | if (!vaddr) | |
1691 | return NULL; | |
1692 | memset(vaddr, 0, size); | |
1693 | ||
1694 | *dma_handle = intel_map_single(hwdev, vaddr, size, DMA_BIDIRECTIONAL); | |
1695 | if (*dma_handle) | |
1696 | return vaddr; | |
1697 | free_pages((unsigned long)vaddr, order); | |
1698 | return NULL; | |
1699 | } | |
1700 | ||
1701 | static void intel_free_coherent(struct device *hwdev, size_t size, | |
1702 | void *vaddr, dma_addr_t dma_handle) | |
1703 | { | |
1704 | int order; | |
1705 | ||
1706 | size = PAGE_ALIGN_4K(size); | |
1707 | order = get_order(size); | |
1708 | ||
1709 | intel_unmap_single(hwdev, dma_handle, size, DMA_BIDIRECTIONAL); | |
1710 | free_pages((unsigned long)vaddr, order); | |
1711 | } | |
1712 | ||
1713 | static void intel_unmap_sg(struct device *hwdev, struct scatterlist *sg, | |
1714 | int nelems, int dir) | |
1715 | { | |
1716 | int i; | |
1717 | struct pci_dev *pdev = to_pci_dev(hwdev); | |
1718 | struct dmar_domain *domain; | |
1719 | u64 flush_addr; | |
1720 | unsigned int flush_size; | |
1721 | ||
1722 | if (pdev->sysdata == DUMMY_DEVICE_DOMAIN_INFO) | |
1723 | return; | |
1724 | ||
1725 | domain = find_domain(pdev); | |
1726 | for (i = 0; i < nelems; i++, sg++) | |
1727 | __intel_unmap_single(hwdev, sg->dma_address, | |
1728 | sg->dma_length, dir, &flush_addr, &flush_size); | |
1729 | ||
1730 | if (iommu_flush_iotlb_dsi(domain->iommu, domain->id, 0)) | |
1731 | iommu_flush_write_buffer(domain->iommu); | |
1732 | } | |
1733 | ||
1734 | #define SG_ENT_VIRT_ADDRESS(sg) (page_address((sg)->page) + (sg)->offset) | |
1735 | static int intel_nontranslate_map_sg(struct device *hddev, | |
1736 | struct scatterlist *sg, int nelems, int dir) | |
1737 | { | |
1738 | int i; | |
1739 | ||
1740 | for (i = 0; i < nelems; i++) { | |
1741 | struct scatterlist *s = &sg[i]; | |
1742 | BUG_ON(!s->page); | |
1743 | s->dma_address = virt_to_bus(SG_ENT_VIRT_ADDRESS(s)); | |
1744 | s->dma_length = s->length; | |
1745 | } | |
1746 | return nelems; | |
1747 | } | |
1748 | ||
1749 | static int intel_map_sg(struct device *hwdev, struct scatterlist *sg, | |
1750 | int nelems, int dir) | |
1751 | { | |
1752 | void *addr; | |
1753 | int i; | |
1754 | dma_addr_t dma_handle; | |
1755 | struct pci_dev *pdev = to_pci_dev(hwdev); | |
1756 | struct dmar_domain *domain; | |
1757 | u64 flush_addr; | |
1758 | unsigned int flush_size; | |
1759 | ||
1760 | BUG_ON(dir == DMA_NONE); | |
1761 | if (pdev->sysdata == DUMMY_DEVICE_DOMAIN_INFO) | |
1762 | return intel_nontranslate_map_sg(hwdev, sg, nelems, dir); | |
1763 | ||
1764 | for (i = 0; i < nelems; i++, sg++) { | |
1765 | addr = SG_ENT_VIRT_ADDRESS(sg); | |
1766 | dma_handle = __intel_map_single(hwdev, addr, | |
1767 | sg->length, dir, &flush_addr, &flush_size); | |
1768 | if (!dma_handle) { | |
1769 | intel_unmap_sg(hwdev, sg - i, i, dir); | |
1770 | sg[0].dma_length = 0; | |
1771 | return 0; | |
1772 | } | |
1773 | sg->dma_address = dma_handle; | |
1774 | sg->dma_length = sg->length; | |
1775 | } | |
1776 | ||
1777 | domain = find_domain(pdev); | |
1778 | ||
1779 | /* it's a non-present to present mapping */ | |
1780 | if (iommu_flush_iotlb_dsi(domain->iommu, domain->id, 1)) | |
1781 | iommu_flush_write_buffer(domain->iommu); | |
1782 | return nelems; | |
1783 | } | |
1784 | ||
1785 | static struct dma_mapping_ops intel_dma_ops = { | |
1786 | .alloc_coherent = intel_alloc_coherent, | |
1787 | .free_coherent = intel_free_coherent, | |
1788 | .map_single = intel_map_single, | |
1789 | .unmap_single = intel_unmap_single, | |
1790 | .map_sg = intel_map_sg, | |
1791 | .unmap_sg = intel_unmap_sg, | |
1792 | }; | |
1793 | ||
1794 | static inline int iommu_domain_cache_init(void) | |
1795 | { | |
1796 | int ret = 0; | |
1797 | ||
1798 | iommu_domain_cache = kmem_cache_create("iommu_domain", | |
1799 | sizeof(struct dmar_domain), | |
1800 | 0, | |
1801 | SLAB_HWCACHE_ALIGN, | |
1802 | ||
1803 | NULL); | |
1804 | if (!iommu_domain_cache) { | |
1805 | printk(KERN_ERR "Couldn't create iommu_domain cache\n"); | |
1806 | ret = -ENOMEM; | |
1807 | } | |
1808 | ||
1809 | return ret; | |
1810 | } | |
1811 | ||
1812 | static inline int iommu_devinfo_cache_init(void) | |
1813 | { | |
1814 | int ret = 0; | |
1815 | ||
1816 | iommu_devinfo_cache = kmem_cache_create("iommu_devinfo", | |
1817 | sizeof(struct device_domain_info), | |
1818 | 0, | |
1819 | SLAB_HWCACHE_ALIGN, | |
1820 | ||
1821 | NULL); | |
1822 | if (!iommu_devinfo_cache) { | |
1823 | printk(KERN_ERR "Couldn't create devinfo cache\n"); | |
1824 | ret = -ENOMEM; | |
1825 | } | |
1826 | ||
1827 | return ret; | |
1828 | } | |
1829 | ||
1830 | static inline int iommu_iova_cache_init(void) | |
1831 | { | |
1832 | int ret = 0; | |
1833 | ||
1834 | iommu_iova_cache = kmem_cache_create("iommu_iova", | |
1835 | sizeof(struct iova), | |
1836 | 0, | |
1837 | SLAB_HWCACHE_ALIGN, | |
1838 | ||
1839 | NULL); | |
1840 | if (!iommu_iova_cache) { | |
1841 | printk(KERN_ERR "Couldn't create iova cache\n"); | |
1842 | ret = -ENOMEM; | |
1843 | } | |
1844 | ||
1845 | return ret; | |
1846 | } | |
1847 | ||
1848 | static int __init iommu_init_mempool(void) | |
1849 | { | |
1850 | int ret; | |
1851 | ret = iommu_iova_cache_init(); | |
1852 | if (ret) | |
1853 | return ret; | |
1854 | ||
1855 | ret = iommu_domain_cache_init(); | |
1856 | if (ret) | |
1857 | goto domain_error; | |
1858 | ||
1859 | ret = iommu_devinfo_cache_init(); | |
1860 | if (!ret) | |
1861 | return ret; | |
1862 | ||
1863 | kmem_cache_destroy(iommu_domain_cache); | |
1864 | domain_error: | |
1865 | kmem_cache_destroy(iommu_iova_cache); | |
1866 | ||
1867 | return -ENOMEM; | |
1868 | } | |
1869 | ||
1870 | static void __init iommu_exit_mempool(void) | |
1871 | { | |
1872 | kmem_cache_destroy(iommu_devinfo_cache); | |
1873 | kmem_cache_destroy(iommu_domain_cache); | |
1874 | kmem_cache_destroy(iommu_iova_cache); | |
1875 | ||
1876 | } | |
1877 | ||
1878 | void __init detect_intel_iommu(void) | |
1879 | { | |
1880 | if (swiotlb || no_iommu || iommu_detected || dmar_disabled) | |
1881 | return; | |
1882 | if (early_dmar_detect()) { | |
1883 | iommu_detected = 1; | |
1884 | } | |
1885 | } | |
1886 | ||
1887 | static void __init init_no_remapping_devices(void) | |
1888 | { | |
1889 | struct dmar_drhd_unit *drhd; | |
1890 | ||
1891 | for_each_drhd_unit(drhd) { | |
1892 | if (!drhd->include_all) { | |
1893 | int i; | |
1894 | for (i = 0; i < drhd->devices_cnt; i++) | |
1895 | if (drhd->devices[i] != NULL) | |
1896 | break; | |
1897 | /* ignore DMAR unit if no pci devices exist */ | |
1898 | if (i == drhd->devices_cnt) | |
1899 | drhd->ignored = 1; | |
1900 | } | |
1901 | } | |
1902 | ||
1903 | if (dmar_map_gfx) | |
1904 | return; | |
1905 | ||
1906 | for_each_drhd_unit(drhd) { | |
1907 | int i; | |
1908 | if (drhd->ignored || drhd->include_all) | |
1909 | continue; | |
1910 | ||
1911 | for (i = 0; i < drhd->devices_cnt; i++) | |
1912 | if (drhd->devices[i] && | |
1913 | !IS_GFX_DEVICE(drhd->devices[i])) | |
1914 | break; | |
1915 | ||
1916 | if (i < drhd->devices_cnt) | |
1917 | continue; | |
1918 | ||
1919 | /* bypass IOMMU if it is just for gfx devices */ | |
1920 | drhd->ignored = 1; | |
1921 | for (i = 0; i < drhd->devices_cnt; i++) { | |
1922 | if (!drhd->devices[i]) | |
1923 | continue; | |
1924 | drhd->devices[i]->sysdata = DUMMY_DEVICE_DOMAIN_INFO; | |
1925 | } | |
1926 | } | |
1927 | } | |
1928 | ||
1929 | int __init intel_iommu_init(void) | |
1930 | { | |
1931 | int ret = 0; | |
1932 | ||
1933 | if (no_iommu || swiotlb || dmar_disabled) | |
1934 | return -ENODEV; | |
1935 | ||
1936 | if (dmar_table_init()) | |
1937 | return -ENODEV; | |
1938 | ||
1939 | iommu_init_mempool(); | |
1940 | dmar_init_reserved_ranges(); | |
1941 | ||
1942 | init_no_remapping_devices(); | |
1943 | ||
1944 | ret = init_dmars(); | |
1945 | if (ret) { | |
1946 | printk(KERN_ERR "IOMMU: dmar init failed\n"); | |
1947 | put_iova_domain(&reserved_iova_list); | |
1948 | iommu_exit_mempool(); | |
1949 | return ret; | |
1950 | } | |
1951 | printk(KERN_INFO | |
1952 | "PCI-DMA: Intel(R) Virtualization Technology for Directed I/O\n"); | |
1953 | ||
1954 | force_iommu = 1; | |
1955 | dma_ops = &intel_dma_ops; | |
1956 | return 0; | |
1957 | } |