intel-iommu: Restore DMAR_BROKEN_GFX_WA option for broken graphics drivers
[linux-2.6.git] / drivers / pci / intel-iommu.c
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) 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>
21  * Author: Fenghua Yu <fenghua.yu@intel.com>
22  */
23
24 #include <linux/init.h>
25 #include <linux/bitmap.h>
26 #include <linux/debugfs.h>
27 #include <linux/slab.h>
28 #include <linux/irq.h>
29 #include <linux/interrupt.h>
30 #include <linux/spinlock.h>
31 #include <linux/pci.h>
32 #include <linux/dmar.h>
33 #include <linux/dma-mapping.h>
34 #include <linux/mempool.h>
35 #include <linux/timer.h>
36 #include <linux/iova.h>
37 #include <linux/iommu.h>
38 #include <linux/intel-iommu.h>
39 #include <linux/sysdev.h>
40 #include <asm/cacheflush.h>
41 #include <asm/iommu.h>
42 #include "pci.h"
43
44 #define ROOT_SIZE               VTD_PAGE_SIZE
45 #define CONTEXT_SIZE            VTD_PAGE_SIZE
46
47 #define IS_GFX_DEVICE(pdev) ((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY)
48 #define IS_ISA_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA)
49
50 #define IOAPIC_RANGE_START      (0xfee00000)
51 #define IOAPIC_RANGE_END        (0xfeefffff)
52 #define IOVA_START_ADDR         (0x1000)
53
54 #define DEFAULT_DOMAIN_ADDRESS_WIDTH 48
55
56 #define MAX_AGAW_WIDTH 64
57
58 #define DOMAIN_MAX_ADDR(gaw) ((((u64)1) << gaw) - 1)
59 #define DOMAIN_MAX_PFN(gaw)  ((((u64)1) << (gaw-VTD_PAGE_SHIFT)) - 1)
60
61 #define IOVA_PFN(addr)          ((addr) >> PAGE_SHIFT)
62 #define DMA_32BIT_PFN           IOVA_PFN(DMA_BIT_MASK(32))
63 #define DMA_64BIT_PFN           IOVA_PFN(DMA_BIT_MASK(64))
64
65
66 /* VT-d pages must always be _smaller_ than MM pages. Otherwise things
67    are never going to work. */
68 static inline unsigned long dma_to_mm_pfn(unsigned long dma_pfn)
69 {
70         return dma_pfn >> (PAGE_SHIFT - VTD_PAGE_SHIFT);
71 }
72
73 static inline unsigned long mm_to_dma_pfn(unsigned long mm_pfn)
74 {
75         return mm_pfn << (PAGE_SHIFT - VTD_PAGE_SHIFT);
76 }
77 static inline unsigned long page_to_dma_pfn(struct page *pg)
78 {
79         return mm_to_dma_pfn(page_to_pfn(pg));
80 }
81 static inline unsigned long virt_to_dma_pfn(void *p)
82 {
83         return page_to_dma_pfn(virt_to_page(p));
84 }
85
86 /* global iommu list, set NULL for ignored DMAR units */
87 static struct intel_iommu **g_iommus;
88
89 static int rwbf_quirk;
90
91 /*
92  * 0: Present
93  * 1-11: Reserved
94  * 12-63: Context Ptr (12 - (haw-1))
95  * 64-127: Reserved
96  */
97 struct root_entry {
98         u64     val;
99         u64     rsvd1;
100 };
101 #define ROOT_ENTRY_NR (VTD_PAGE_SIZE/sizeof(struct root_entry))
102 static inline bool root_present(struct root_entry *root)
103 {
104         return (root->val & 1);
105 }
106 static inline void set_root_present(struct root_entry *root)
107 {
108         root->val |= 1;
109 }
110 static inline void set_root_value(struct root_entry *root, unsigned long value)
111 {
112         root->val |= value & VTD_PAGE_MASK;
113 }
114
115 static inline struct context_entry *
116 get_context_addr_from_root(struct root_entry *root)
117 {
118         return (struct context_entry *)
119                 (root_present(root)?phys_to_virt(
120                 root->val & VTD_PAGE_MASK) :
121                 NULL);
122 }
123
124 /*
125  * low 64 bits:
126  * 0: present
127  * 1: fault processing disable
128  * 2-3: translation type
129  * 12-63: address space root
130  * high 64 bits:
131  * 0-2: address width
132  * 3-6: aval
133  * 8-23: domain id
134  */
135 struct context_entry {
136         u64 lo;
137         u64 hi;
138 };
139
140 static inline bool context_present(struct context_entry *context)
141 {
142         return (context->lo & 1);
143 }
144 static inline void context_set_present(struct context_entry *context)
145 {
146         context->lo |= 1;
147 }
148
149 static inline void context_set_fault_enable(struct context_entry *context)
150 {
151         context->lo &= (((u64)-1) << 2) | 1;
152 }
153
154 static inline void context_set_translation_type(struct context_entry *context,
155                                                 unsigned long value)
156 {
157         context->lo &= (((u64)-1) << 4) | 3;
158         context->lo |= (value & 3) << 2;
159 }
160
161 static inline void context_set_address_root(struct context_entry *context,
162                                             unsigned long value)
163 {
164         context->lo |= value & VTD_PAGE_MASK;
165 }
166
167 static inline void context_set_address_width(struct context_entry *context,
168                                              unsigned long value)
169 {
170         context->hi |= value & 7;
171 }
172
173 static inline void context_set_domain_id(struct context_entry *context,
174                                          unsigned long value)
175 {
176         context->hi |= (value & ((1 << 16) - 1)) << 8;
177 }
178
179 static inline void context_clear_entry(struct context_entry *context)
180 {
181         context->lo = 0;
182         context->hi = 0;
183 }
184
185 /*
186  * 0: readable
187  * 1: writable
188  * 2-6: reserved
189  * 7: super page
190  * 8-10: available
191  * 11: snoop behavior
192  * 12-63: Host physcial address
193  */
194 struct dma_pte {
195         u64 val;
196 };
197
198 static inline void dma_clear_pte(struct dma_pte *pte)
199 {
200         pte->val = 0;
201 }
202
203 static inline void dma_set_pte_readable(struct dma_pte *pte)
204 {
205         pte->val |= DMA_PTE_READ;
206 }
207
208 static inline void dma_set_pte_writable(struct dma_pte *pte)
209 {
210         pte->val |= DMA_PTE_WRITE;
211 }
212
213 static inline void dma_set_pte_snp(struct dma_pte *pte)
214 {
215         pte->val |= DMA_PTE_SNP;
216 }
217
218 static inline void dma_set_pte_prot(struct dma_pte *pte, unsigned long prot)
219 {
220         pte->val = (pte->val & ~3) | (prot & 3);
221 }
222
223 static inline u64 dma_pte_addr(struct dma_pte *pte)
224 {
225 #ifdef CONFIG_64BIT
226         return pte->val & VTD_PAGE_MASK;
227 #else
228         /* Must have a full atomic 64-bit read */
229         return  __cmpxchg64(pte, 0ULL, 0ULL) & VTD_PAGE_MASK;
230 #endif
231 }
232
233 static inline void dma_set_pte_pfn(struct dma_pte *pte, unsigned long pfn)
234 {
235         pte->val |= (uint64_t)pfn << VTD_PAGE_SHIFT;
236 }
237
238 static inline bool dma_pte_present(struct dma_pte *pte)
239 {
240         return (pte->val & 3) != 0;
241 }
242
243 static inline int first_pte_in_page(struct dma_pte *pte)
244 {
245         return !((unsigned long)pte & ~VTD_PAGE_MASK);
246 }
247
248 /*
249  * This domain is a statically identity mapping domain.
250  *      1. This domain creats a static 1:1 mapping to all usable memory.
251  *      2. It maps to each iommu if successful.
252  *      3. Each iommu mapps to this domain if successful.
253  */
254 struct dmar_domain *si_domain;
255
256 /* devices under the same p2p bridge are owned in one domain */
257 #define DOMAIN_FLAG_P2P_MULTIPLE_DEVICES (1 << 0)
258
259 /* domain represents a virtual machine, more than one devices
260  * across iommus may be owned in one domain, e.g. kvm guest.
261  */
262 #define DOMAIN_FLAG_VIRTUAL_MACHINE     (1 << 1)
263
264 /* si_domain contains mulitple devices */
265 #define DOMAIN_FLAG_STATIC_IDENTITY     (1 << 2)
266
267 struct dmar_domain {
268         int     id;                     /* domain id */
269         unsigned long iommu_bmp;        /* bitmap of iommus this domain uses*/
270
271         struct list_head devices;       /* all devices' list */
272         struct iova_domain iovad;       /* iova's that belong to this domain */
273
274         struct dma_pte  *pgd;           /* virtual address */
275         int             gaw;            /* max guest address width */
276
277         /* adjusted guest address width, 0 is level 2 30-bit */
278         int             agaw;
279
280         int             flags;          /* flags to find out type of domain */
281
282         int             iommu_coherency;/* indicate coherency of iommu access */
283         int             iommu_snooping; /* indicate snooping control feature*/
284         int             iommu_count;    /* reference count of iommu */
285         spinlock_t      iommu_lock;     /* protect iommu set in domain */
286         u64             max_addr;       /* maximum mapped address */
287 };
288
289 /* PCI domain-device relationship */
290 struct device_domain_info {
291         struct list_head link;  /* link to domain siblings */
292         struct list_head global; /* link to global list */
293         int segment;            /* PCI domain */
294         u8 bus;                 /* PCI bus number */
295         u8 devfn;               /* PCI devfn number */
296         struct pci_dev *dev; /* it's NULL for PCIE-to-PCI bridge */
297         struct intel_iommu *iommu; /* IOMMU used by this device */
298         struct dmar_domain *domain; /* pointer to domain */
299 };
300
301 static void flush_unmaps_timeout(unsigned long data);
302
303 DEFINE_TIMER(unmap_timer,  flush_unmaps_timeout, 0, 0);
304
305 #define HIGH_WATER_MARK 250
306 struct deferred_flush_tables {
307         int next;
308         struct iova *iova[HIGH_WATER_MARK];
309         struct dmar_domain *domain[HIGH_WATER_MARK];
310 };
311
312 static struct deferred_flush_tables *deferred_flush;
313
314 /* bitmap for indexing intel_iommus */
315 static int g_num_of_iommus;
316
317 static DEFINE_SPINLOCK(async_umap_flush_lock);
318 static LIST_HEAD(unmaps_to_do);
319
320 static int timer_on;
321 static long list_size;
322
323 static void domain_remove_dev_info(struct dmar_domain *domain);
324
325 #ifdef CONFIG_DMAR_DEFAULT_ON
326 int dmar_disabled = 0;
327 #else
328 int dmar_disabled = 1;
329 #endif /*CONFIG_DMAR_DEFAULT_ON*/
330
331 static int __initdata dmar_map_gfx = 1;
332 static int dmar_forcedac;
333 static int intel_iommu_strict;
334
335 #define DUMMY_DEVICE_DOMAIN_INFO ((struct device_domain_info *)(-1))
336 static DEFINE_SPINLOCK(device_domain_lock);
337 static LIST_HEAD(device_domain_list);
338
339 static struct iommu_ops intel_iommu_ops;
340
341 static int __init intel_iommu_setup(char *str)
342 {
343         if (!str)
344                 return -EINVAL;
345         while (*str) {
346                 if (!strncmp(str, "on", 2)) {
347                         dmar_disabled = 0;
348                         printk(KERN_INFO "Intel-IOMMU: enabled\n");
349                 } else if (!strncmp(str, "off", 3)) {
350                         dmar_disabled = 1;
351                         printk(KERN_INFO "Intel-IOMMU: disabled\n");
352                 } else if (!strncmp(str, "igfx_off", 8)) {
353                         dmar_map_gfx = 0;
354                         printk(KERN_INFO
355                                 "Intel-IOMMU: disable GFX device mapping\n");
356                 } else if (!strncmp(str, "forcedac", 8)) {
357                         printk(KERN_INFO
358                                 "Intel-IOMMU: Forcing DAC for PCI devices\n");
359                         dmar_forcedac = 1;
360                 } else if (!strncmp(str, "strict", 6)) {
361                         printk(KERN_INFO
362                                 "Intel-IOMMU: disable batched IOTLB flush\n");
363                         intel_iommu_strict = 1;
364                 }
365
366                 str += strcspn(str, ",");
367                 while (*str == ',')
368                         str++;
369         }
370         return 0;
371 }
372 __setup("intel_iommu=", intel_iommu_setup);
373
374 static struct kmem_cache *iommu_domain_cache;
375 static struct kmem_cache *iommu_devinfo_cache;
376 static struct kmem_cache *iommu_iova_cache;
377
378 static inline void *iommu_kmem_cache_alloc(struct kmem_cache *cachep)
379 {
380         unsigned int flags;
381         void *vaddr;
382
383         /* trying to avoid low memory issues */
384         flags = current->flags & PF_MEMALLOC;
385         current->flags |= PF_MEMALLOC;
386         vaddr = kmem_cache_alloc(cachep, GFP_ATOMIC);
387         current->flags &= (~PF_MEMALLOC | flags);
388         return vaddr;
389 }
390
391
392 static inline void *alloc_pgtable_page(void)
393 {
394         unsigned int flags;
395         void *vaddr;
396
397         /* trying to avoid low memory issues */
398         flags = current->flags & PF_MEMALLOC;
399         current->flags |= PF_MEMALLOC;
400         vaddr = (void *)get_zeroed_page(GFP_ATOMIC);
401         current->flags &= (~PF_MEMALLOC | flags);
402         return vaddr;
403 }
404
405 static inline void free_pgtable_page(void *vaddr)
406 {
407         free_page((unsigned long)vaddr);
408 }
409
410 static inline void *alloc_domain_mem(void)
411 {
412         return iommu_kmem_cache_alloc(iommu_domain_cache);
413 }
414
415 static void free_domain_mem(void *vaddr)
416 {
417         kmem_cache_free(iommu_domain_cache, vaddr);
418 }
419
420 static inline void * alloc_devinfo_mem(void)
421 {
422         return iommu_kmem_cache_alloc(iommu_devinfo_cache);
423 }
424
425 static inline void free_devinfo_mem(void *vaddr)
426 {
427         kmem_cache_free(iommu_devinfo_cache, vaddr);
428 }
429
430 struct iova *alloc_iova_mem(void)
431 {
432         return iommu_kmem_cache_alloc(iommu_iova_cache);
433 }
434
435 void free_iova_mem(struct iova *iova)
436 {
437         kmem_cache_free(iommu_iova_cache, iova);
438 }
439
440
441 static inline int width_to_agaw(int width);
442
443 static int __iommu_calculate_agaw(struct intel_iommu *iommu, int max_gaw)
444 {
445         unsigned long sagaw;
446         int agaw = -1;
447
448         sagaw = cap_sagaw(iommu->cap);
449         for (agaw = width_to_agaw(max_gaw);
450              agaw >= 0; agaw--) {
451                 if (test_bit(agaw, &sagaw))
452                         break;
453         }
454
455         return agaw;
456 }
457
458 /*
459  * Calculate max SAGAW for each iommu.
460  */
461 int iommu_calculate_max_sagaw(struct intel_iommu *iommu)
462 {
463         return __iommu_calculate_agaw(iommu, MAX_AGAW_WIDTH);
464 }
465
466 /*
467  * calculate agaw for each iommu.
468  * "SAGAW" may be different across iommus, use a default agaw, and
469  * get a supported less agaw for iommus that don't support the default agaw.
470  */
471 int iommu_calculate_agaw(struct intel_iommu *iommu)
472 {
473         return __iommu_calculate_agaw(iommu, DEFAULT_DOMAIN_ADDRESS_WIDTH);
474 }
475
476 /* This functionin only returns single iommu in a domain */
477 static struct intel_iommu *domain_get_iommu(struct dmar_domain *domain)
478 {
479         int iommu_id;
480
481         /* si_domain and vm domain should not get here. */
482         BUG_ON(domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE);
483         BUG_ON(domain->flags & DOMAIN_FLAG_STATIC_IDENTITY);
484
485         iommu_id = find_first_bit(&domain->iommu_bmp, g_num_of_iommus);
486         if (iommu_id < 0 || iommu_id >= g_num_of_iommus)
487                 return NULL;
488
489         return g_iommus[iommu_id];
490 }
491
492 static void domain_update_iommu_coherency(struct dmar_domain *domain)
493 {
494         int i;
495
496         domain->iommu_coherency = 1;
497
498         i = find_first_bit(&domain->iommu_bmp, g_num_of_iommus);
499         for (; i < g_num_of_iommus; ) {
500                 if (!ecap_coherent(g_iommus[i]->ecap)) {
501                         domain->iommu_coherency = 0;
502                         break;
503                 }
504                 i = find_next_bit(&domain->iommu_bmp, g_num_of_iommus, i+1);
505         }
506 }
507
508 static void domain_update_iommu_snooping(struct dmar_domain *domain)
509 {
510         int i;
511
512         domain->iommu_snooping = 1;
513
514         i = find_first_bit(&domain->iommu_bmp, g_num_of_iommus);
515         for (; i < g_num_of_iommus; ) {
516                 if (!ecap_sc_support(g_iommus[i]->ecap)) {
517                         domain->iommu_snooping = 0;
518                         break;
519                 }
520                 i = find_next_bit(&domain->iommu_bmp, g_num_of_iommus, i+1);
521         }
522 }
523
524 /* Some capabilities may be different across iommus */
525 static void domain_update_iommu_cap(struct dmar_domain *domain)
526 {
527         domain_update_iommu_coherency(domain);
528         domain_update_iommu_snooping(domain);
529 }
530
531 static struct intel_iommu *device_to_iommu(int segment, u8 bus, u8 devfn)
532 {
533         struct dmar_drhd_unit *drhd = NULL;
534         int i;
535
536         for_each_drhd_unit(drhd) {
537                 if (drhd->ignored)
538                         continue;
539                 if (segment != drhd->segment)
540                         continue;
541
542                 for (i = 0; i < drhd->devices_cnt; i++) {
543                         if (drhd->devices[i] &&
544                             drhd->devices[i]->bus->number == bus &&
545                             drhd->devices[i]->devfn == devfn)
546                                 return drhd->iommu;
547                         if (drhd->devices[i] &&
548                             drhd->devices[i]->subordinate &&
549                             drhd->devices[i]->subordinate->number <= bus &&
550                             drhd->devices[i]->subordinate->subordinate >= bus)
551                                 return drhd->iommu;
552                 }
553
554                 if (drhd->include_all)
555                         return drhd->iommu;
556         }
557
558         return NULL;
559 }
560
561 static void domain_flush_cache(struct dmar_domain *domain,
562                                void *addr, int size)
563 {
564         if (!domain->iommu_coherency)
565                 clflush_cache_range(addr, size);
566 }
567
568 /* Gets context entry for a given bus and devfn */
569 static struct context_entry * device_to_context_entry(struct intel_iommu *iommu,
570                 u8 bus, u8 devfn)
571 {
572         struct root_entry *root;
573         struct context_entry *context;
574         unsigned long phy_addr;
575         unsigned long flags;
576
577         spin_lock_irqsave(&iommu->lock, flags);
578         root = &iommu->root_entry[bus];
579         context = get_context_addr_from_root(root);
580         if (!context) {
581                 context = (struct context_entry *)alloc_pgtable_page();
582                 if (!context) {
583                         spin_unlock_irqrestore(&iommu->lock, flags);
584                         return NULL;
585                 }
586                 __iommu_flush_cache(iommu, (void *)context, CONTEXT_SIZE);
587                 phy_addr = virt_to_phys((void *)context);
588                 set_root_value(root, phy_addr);
589                 set_root_present(root);
590                 __iommu_flush_cache(iommu, root, sizeof(*root));
591         }
592         spin_unlock_irqrestore(&iommu->lock, flags);
593         return &context[devfn];
594 }
595
596 static int device_context_mapped(struct intel_iommu *iommu, u8 bus, u8 devfn)
597 {
598         struct root_entry *root;
599         struct context_entry *context;
600         int ret;
601         unsigned long flags;
602
603         spin_lock_irqsave(&iommu->lock, flags);
604         root = &iommu->root_entry[bus];
605         context = get_context_addr_from_root(root);
606         if (!context) {
607                 ret = 0;
608                 goto out;
609         }
610         ret = context_present(&context[devfn]);
611 out:
612         spin_unlock_irqrestore(&iommu->lock, flags);
613         return ret;
614 }
615
616 static void clear_context_table(struct intel_iommu *iommu, u8 bus, u8 devfn)
617 {
618         struct root_entry *root;
619         struct context_entry *context;
620         unsigned long flags;
621
622         spin_lock_irqsave(&iommu->lock, flags);
623         root = &iommu->root_entry[bus];
624         context = get_context_addr_from_root(root);
625         if (context) {
626                 context_clear_entry(&context[devfn]);
627                 __iommu_flush_cache(iommu, &context[devfn], \
628                         sizeof(*context));
629         }
630         spin_unlock_irqrestore(&iommu->lock, flags);
631 }
632
633 static void free_context_table(struct intel_iommu *iommu)
634 {
635         struct root_entry *root;
636         int i;
637         unsigned long flags;
638         struct context_entry *context;
639
640         spin_lock_irqsave(&iommu->lock, flags);
641         if (!iommu->root_entry) {
642                 goto out;
643         }
644         for (i = 0; i < ROOT_ENTRY_NR; i++) {
645                 root = &iommu->root_entry[i];
646                 context = get_context_addr_from_root(root);
647                 if (context)
648                         free_pgtable_page(context);
649         }
650         free_pgtable_page(iommu->root_entry);
651         iommu->root_entry = NULL;
652 out:
653         spin_unlock_irqrestore(&iommu->lock, flags);
654 }
655
656 /* page table handling */
657 #define LEVEL_STRIDE            (9)
658 #define LEVEL_MASK              (((u64)1 << LEVEL_STRIDE) - 1)
659
660 static inline int agaw_to_level(int agaw)
661 {
662         return agaw + 2;
663 }
664
665 static inline int agaw_to_width(int agaw)
666 {
667         return 30 + agaw * LEVEL_STRIDE;
668
669 }
670
671 static inline int width_to_agaw(int width)
672 {
673         return (width - 30) / LEVEL_STRIDE;
674 }
675
676 static inline unsigned int level_to_offset_bits(int level)
677 {
678         return (level - 1) * LEVEL_STRIDE;
679 }
680
681 static inline int pfn_level_offset(unsigned long pfn, int level)
682 {
683         return (pfn >> level_to_offset_bits(level)) & LEVEL_MASK;
684 }
685
686 static inline unsigned long level_mask(int level)
687 {
688         return -1UL << level_to_offset_bits(level);
689 }
690
691 static inline unsigned long level_size(int level)
692 {
693         return 1UL << level_to_offset_bits(level);
694 }
695
696 static inline unsigned long align_to_level(unsigned long pfn, int level)
697 {
698         return (pfn + level_size(level) - 1) & level_mask(level);
699 }
700
701 static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain,
702                                       unsigned long pfn)
703 {
704         int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT;
705         struct dma_pte *parent, *pte = NULL;
706         int level = agaw_to_level(domain->agaw);
707         int offset;
708
709         BUG_ON(!domain->pgd);
710         BUG_ON(addr_width < BITS_PER_LONG && pfn >> addr_width);
711         parent = domain->pgd;
712
713         while (level > 0) {
714                 void *tmp_page;
715
716                 offset = pfn_level_offset(pfn, level);
717                 pte = &parent[offset];
718                 if (level == 1)
719                         break;
720
721                 if (!dma_pte_present(pte)) {
722                         uint64_t pteval;
723
724                         tmp_page = alloc_pgtable_page();
725
726                         if (!tmp_page)
727                                 return NULL;
728
729                         domain_flush_cache(domain, tmp_page, VTD_PAGE_SIZE);
730                         pteval = (virt_to_dma_pfn(tmp_page) << VTD_PAGE_SHIFT) | DMA_PTE_READ | DMA_PTE_WRITE;
731                         if (cmpxchg64(&pte->val, 0ULL, pteval)) {
732                                 /* Someone else set it while we were thinking; use theirs. */
733                                 free_pgtable_page(tmp_page);
734                         } else {
735                                 dma_pte_addr(pte);
736                                 domain_flush_cache(domain, pte, sizeof(*pte));
737                         }
738                 }
739                 parent = phys_to_virt(dma_pte_addr(pte));
740                 level--;
741         }
742
743         return pte;
744 }
745
746 /* return address's pte at specific level */
747 static struct dma_pte *dma_pfn_level_pte(struct dmar_domain *domain,
748                                          unsigned long pfn,
749                                          int level)
750 {
751         struct dma_pte *parent, *pte = NULL;
752         int total = agaw_to_level(domain->agaw);
753         int offset;
754
755         parent = domain->pgd;
756         while (level <= total) {
757                 offset = pfn_level_offset(pfn, total);
758                 pte = &parent[offset];
759                 if (level == total)
760                         return pte;
761
762                 if (!dma_pte_present(pte))
763                         break;
764                 parent = phys_to_virt(dma_pte_addr(pte));
765                 total--;
766         }
767         return NULL;
768 }
769
770 /* clear last level pte, a tlb flush should be followed */
771 static void dma_pte_clear_range(struct dmar_domain *domain,
772                                 unsigned long start_pfn,
773                                 unsigned long last_pfn)
774 {
775         int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT;
776         struct dma_pte *first_pte, *pte;
777
778         BUG_ON(addr_width < BITS_PER_LONG && start_pfn >> addr_width);
779         BUG_ON(addr_width < BITS_PER_LONG && last_pfn >> addr_width);
780
781         /* we don't need lock here; nobody else touches the iova range */
782         while (start_pfn <= last_pfn) {
783                 first_pte = pte = dma_pfn_level_pte(domain, start_pfn, 1);
784                 if (!pte) {
785                         start_pfn = align_to_level(start_pfn + 1, 2);
786                         continue;
787                 }
788                 do { 
789                         dma_clear_pte(pte);
790                         start_pfn++;
791                         pte++;
792                 } while (start_pfn <= last_pfn && !first_pte_in_page(pte));
793
794                 domain_flush_cache(domain, first_pte,
795                                    (void *)pte - (void *)first_pte);
796         }
797 }
798
799 /* free page table pages. last level pte should already be cleared */
800 static void dma_pte_free_pagetable(struct dmar_domain *domain,
801                                    unsigned long start_pfn,
802                                    unsigned long last_pfn)
803 {
804         int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT;
805         struct dma_pte *first_pte, *pte;
806         int total = agaw_to_level(domain->agaw);
807         int level;
808         unsigned long tmp;
809
810         BUG_ON(addr_width < BITS_PER_LONG && start_pfn >> addr_width);
811         BUG_ON(addr_width < BITS_PER_LONG && last_pfn >> addr_width);
812
813         /* We don't need lock here; nobody else touches the iova range */
814         level = 2;
815         while (level <= total) {
816                 tmp = align_to_level(start_pfn, level);
817
818                 /* If we can't even clear one PTE at this level, we're done */
819                 if (tmp + level_size(level) - 1 > last_pfn)
820                         return;
821
822                 while (tmp + level_size(level) - 1 <= last_pfn) {
823                         first_pte = pte = dma_pfn_level_pte(domain, tmp, level);
824                         if (!pte) {
825                                 tmp = align_to_level(tmp + 1, level + 1);
826                                 continue;
827                         }
828                         do {
829                                 if (dma_pte_present(pte)) {
830                                         free_pgtable_page(phys_to_virt(dma_pte_addr(pte)));
831                                         dma_clear_pte(pte);
832                                 }
833                                 pte++;
834                                 tmp += level_size(level);
835                         } while (!first_pte_in_page(pte) &&
836                                  tmp + level_size(level) - 1 <= last_pfn);
837
838                         domain_flush_cache(domain, first_pte,
839                                            (void *)pte - (void *)first_pte);
840                         
841                 }
842                 level++;
843         }
844         /* free pgd */
845         if (start_pfn == 0 && last_pfn == DOMAIN_MAX_PFN(domain->gaw)) {
846                 free_pgtable_page(domain->pgd);
847                 domain->pgd = NULL;
848         }
849 }
850
851 /* iommu handling */
852 static int iommu_alloc_root_entry(struct intel_iommu *iommu)
853 {
854         struct root_entry *root;
855         unsigned long flags;
856
857         root = (struct root_entry *)alloc_pgtable_page();
858         if (!root)
859                 return -ENOMEM;
860
861         __iommu_flush_cache(iommu, root, ROOT_SIZE);
862
863         spin_lock_irqsave(&iommu->lock, flags);
864         iommu->root_entry = root;
865         spin_unlock_irqrestore(&iommu->lock, flags);
866
867         return 0;
868 }
869
870 static void iommu_set_root_entry(struct intel_iommu *iommu)
871 {
872         void *addr;
873         u32 sts;
874         unsigned long flag;
875
876         addr = iommu->root_entry;
877
878         spin_lock_irqsave(&iommu->register_lock, flag);
879         dmar_writeq(iommu->reg + DMAR_RTADDR_REG, virt_to_phys(addr));
880
881         writel(iommu->gcmd | DMA_GCMD_SRTP, iommu->reg + DMAR_GCMD_REG);
882
883         /* Make sure hardware complete it */
884         IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
885                       readl, (sts & DMA_GSTS_RTPS), sts);
886
887         spin_unlock_irqrestore(&iommu->register_lock, flag);
888 }
889
890 static void iommu_flush_write_buffer(struct intel_iommu *iommu)
891 {
892         u32 val;
893         unsigned long flag;
894
895         if (!rwbf_quirk && !cap_rwbf(iommu->cap))
896                 return;
897
898         spin_lock_irqsave(&iommu->register_lock, flag);
899         writel(iommu->gcmd | DMA_GCMD_WBF, iommu->reg + DMAR_GCMD_REG);
900
901         /* Make sure hardware complete it */
902         IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
903                       readl, (!(val & DMA_GSTS_WBFS)), val);
904
905         spin_unlock_irqrestore(&iommu->register_lock, flag);
906 }
907
908 /* return value determine if we need a write buffer flush */
909 static void __iommu_flush_context(struct intel_iommu *iommu,
910                                   u16 did, u16 source_id, u8 function_mask,
911                                   u64 type)
912 {
913         u64 val = 0;
914         unsigned long flag;
915
916         switch (type) {
917         case DMA_CCMD_GLOBAL_INVL:
918                 val = DMA_CCMD_GLOBAL_INVL;
919                 break;
920         case DMA_CCMD_DOMAIN_INVL:
921                 val = DMA_CCMD_DOMAIN_INVL|DMA_CCMD_DID(did);
922                 break;
923         case DMA_CCMD_DEVICE_INVL:
924                 val = DMA_CCMD_DEVICE_INVL|DMA_CCMD_DID(did)
925                         | DMA_CCMD_SID(source_id) | DMA_CCMD_FM(function_mask);
926                 break;
927         default:
928                 BUG();
929         }
930         val |= DMA_CCMD_ICC;
931
932         spin_lock_irqsave(&iommu->register_lock, flag);
933         dmar_writeq(iommu->reg + DMAR_CCMD_REG, val);
934
935         /* Make sure hardware complete it */
936         IOMMU_WAIT_OP(iommu, DMAR_CCMD_REG,
937                 dmar_readq, (!(val & DMA_CCMD_ICC)), val);
938
939         spin_unlock_irqrestore(&iommu->register_lock, flag);
940 }
941
942 /* return value determine if we need a write buffer flush */
943 static void __iommu_flush_iotlb(struct intel_iommu *iommu, u16 did,
944                                 u64 addr, unsigned int size_order, u64 type)
945 {
946         int tlb_offset = ecap_iotlb_offset(iommu->ecap);
947         u64 val = 0, val_iva = 0;
948         unsigned long flag;
949
950         switch (type) {
951         case DMA_TLB_GLOBAL_FLUSH:
952                 /* global flush doesn't need set IVA_REG */
953                 val = DMA_TLB_GLOBAL_FLUSH|DMA_TLB_IVT;
954                 break;
955         case DMA_TLB_DSI_FLUSH:
956                 val = DMA_TLB_DSI_FLUSH|DMA_TLB_IVT|DMA_TLB_DID(did);
957                 break;
958         case DMA_TLB_PSI_FLUSH:
959                 val = DMA_TLB_PSI_FLUSH|DMA_TLB_IVT|DMA_TLB_DID(did);
960                 /* Note: always flush non-leaf currently */
961                 val_iva = size_order | addr;
962                 break;
963         default:
964                 BUG();
965         }
966         /* Note: set drain read/write */
967 #if 0
968         /*
969          * This is probably to be super secure.. Looks like we can
970          * ignore it without any impact.
971          */
972         if (cap_read_drain(iommu->cap))
973                 val |= DMA_TLB_READ_DRAIN;
974 #endif
975         if (cap_write_drain(iommu->cap))
976                 val |= DMA_TLB_WRITE_DRAIN;
977
978         spin_lock_irqsave(&iommu->register_lock, flag);
979         /* Note: Only uses first TLB reg currently */
980         if (val_iva)
981                 dmar_writeq(iommu->reg + tlb_offset, val_iva);
982         dmar_writeq(iommu->reg + tlb_offset + 8, val);
983
984         /* Make sure hardware complete it */
985         IOMMU_WAIT_OP(iommu, tlb_offset + 8,
986                 dmar_readq, (!(val & DMA_TLB_IVT)), val);
987
988         spin_unlock_irqrestore(&iommu->register_lock, flag);
989
990         /* check IOTLB invalidation granularity */
991         if (DMA_TLB_IAIG(val) == 0)
992                 printk(KERN_ERR"IOMMU: flush IOTLB failed\n");
993         if (DMA_TLB_IAIG(val) != DMA_TLB_IIRG(type))
994                 pr_debug("IOMMU: tlb flush request %Lx, actual %Lx\n",
995                         (unsigned long long)DMA_TLB_IIRG(type),
996                         (unsigned long long)DMA_TLB_IAIG(val));
997 }
998
999 static struct device_domain_info *iommu_support_dev_iotlb(
1000         struct dmar_domain *domain, int segment, u8 bus, u8 devfn)
1001 {
1002         int found = 0;
1003         unsigned long flags;
1004         struct device_domain_info *info;
1005         struct intel_iommu *iommu = device_to_iommu(segment, bus, devfn);
1006
1007         if (!ecap_dev_iotlb_support(iommu->ecap))
1008                 return NULL;
1009
1010         if (!iommu->qi)
1011                 return NULL;
1012
1013         spin_lock_irqsave(&device_domain_lock, flags);
1014         list_for_each_entry(info, &domain->devices, link)
1015                 if (info->bus == bus && info->devfn == devfn) {
1016                         found = 1;
1017                         break;
1018                 }
1019         spin_unlock_irqrestore(&device_domain_lock, flags);
1020
1021         if (!found || !info->dev)
1022                 return NULL;
1023
1024         if (!pci_find_ext_capability(info->dev, PCI_EXT_CAP_ID_ATS))
1025                 return NULL;
1026
1027         if (!dmar_find_matched_atsr_unit(info->dev))
1028                 return NULL;
1029
1030         info->iommu = iommu;
1031
1032         return info;
1033 }
1034
1035 static void iommu_enable_dev_iotlb(struct device_domain_info *info)
1036 {
1037         if (!info)
1038                 return;
1039
1040         pci_enable_ats(info->dev, VTD_PAGE_SHIFT);
1041 }
1042
1043 static void iommu_disable_dev_iotlb(struct device_domain_info *info)
1044 {
1045         if (!info->dev || !pci_ats_enabled(info->dev))
1046                 return;
1047
1048         pci_disable_ats(info->dev);
1049 }
1050
1051 static void iommu_flush_dev_iotlb(struct dmar_domain *domain,
1052                                   u64 addr, unsigned mask)
1053 {
1054         u16 sid, qdep;
1055         unsigned long flags;
1056         struct device_domain_info *info;
1057
1058         spin_lock_irqsave(&device_domain_lock, flags);
1059         list_for_each_entry(info, &domain->devices, link) {
1060                 if (!info->dev || !pci_ats_enabled(info->dev))
1061                         continue;
1062
1063                 sid = info->bus << 8 | info->devfn;
1064                 qdep = pci_ats_queue_depth(info->dev);
1065                 qi_flush_dev_iotlb(info->iommu, sid, qdep, addr, mask);
1066         }
1067         spin_unlock_irqrestore(&device_domain_lock, flags);
1068 }
1069
1070 static void iommu_flush_iotlb_psi(struct intel_iommu *iommu, u16 did,
1071                                   unsigned long pfn, unsigned int pages)
1072 {
1073         unsigned int mask = ilog2(__roundup_pow_of_two(pages));
1074         uint64_t addr = (uint64_t)pfn << VTD_PAGE_SHIFT;
1075
1076         BUG_ON(pages == 0);
1077
1078         /*
1079          * Fallback to domain selective flush if no PSI support or the size is
1080          * too big.
1081          * PSI requires page size to be 2 ^ x, and the base address is naturally
1082          * aligned to the size
1083          */
1084         if (!cap_pgsel_inv(iommu->cap) || mask > cap_max_amask_val(iommu->cap))
1085                 iommu->flush.flush_iotlb(iommu, did, 0, 0,
1086                                                 DMA_TLB_DSI_FLUSH);
1087         else
1088                 iommu->flush.flush_iotlb(iommu, did, addr, mask,
1089                                                 DMA_TLB_PSI_FLUSH);
1090
1091         /*
1092          * In caching mode, domain ID 0 is reserved for non-present to present
1093          * mapping flush. Device IOTLB doesn't need to be flushed in this case.
1094          */
1095         if (!cap_caching_mode(iommu->cap) || did)
1096                 iommu_flush_dev_iotlb(iommu->domains[did], addr, mask);
1097 }
1098
1099 static void iommu_disable_protect_mem_regions(struct intel_iommu *iommu)
1100 {
1101         u32 pmen;
1102         unsigned long flags;
1103
1104         spin_lock_irqsave(&iommu->register_lock, flags);
1105         pmen = readl(iommu->reg + DMAR_PMEN_REG);
1106         pmen &= ~DMA_PMEN_EPM;
1107         writel(pmen, iommu->reg + DMAR_PMEN_REG);
1108
1109         /* wait for the protected region status bit to clear */
1110         IOMMU_WAIT_OP(iommu, DMAR_PMEN_REG,
1111                 readl, !(pmen & DMA_PMEN_PRS), pmen);
1112
1113         spin_unlock_irqrestore(&iommu->register_lock, flags);
1114 }
1115
1116 static int iommu_enable_translation(struct intel_iommu *iommu)
1117 {
1118         u32 sts;
1119         unsigned long flags;
1120
1121         spin_lock_irqsave(&iommu->register_lock, flags);
1122         iommu->gcmd |= DMA_GCMD_TE;
1123         writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
1124
1125         /* Make sure hardware complete it */
1126         IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
1127                       readl, (sts & DMA_GSTS_TES), sts);
1128
1129         spin_unlock_irqrestore(&iommu->register_lock, flags);
1130         return 0;
1131 }
1132
1133 static int iommu_disable_translation(struct intel_iommu *iommu)
1134 {
1135         u32 sts;
1136         unsigned long flag;
1137
1138         spin_lock_irqsave(&iommu->register_lock, flag);
1139         iommu->gcmd &= ~DMA_GCMD_TE;
1140         writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
1141
1142         /* Make sure hardware complete it */
1143         IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
1144                       readl, (!(sts & DMA_GSTS_TES)), sts);
1145
1146         spin_unlock_irqrestore(&iommu->register_lock, flag);
1147         return 0;
1148 }
1149
1150
1151 static int iommu_init_domains(struct intel_iommu *iommu)
1152 {
1153         unsigned long ndomains;
1154         unsigned long nlongs;
1155
1156         ndomains = cap_ndoms(iommu->cap);
1157         pr_debug("Number of Domains supportd <%ld>\n", ndomains);
1158         nlongs = BITS_TO_LONGS(ndomains);
1159
1160         /* TBD: there might be 64K domains,
1161          * consider other allocation for future chip
1162          */
1163         iommu->domain_ids = kcalloc(nlongs, sizeof(unsigned long), GFP_KERNEL);
1164         if (!iommu->domain_ids) {
1165                 printk(KERN_ERR "Allocating domain id array failed\n");
1166                 return -ENOMEM;
1167         }
1168         iommu->domains = kcalloc(ndomains, sizeof(struct dmar_domain *),
1169                         GFP_KERNEL);
1170         if (!iommu->domains) {
1171                 printk(KERN_ERR "Allocating domain array failed\n");
1172                 kfree(iommu->domain_ids);
1173                 return -ENOMEM;
1174         }
1175
1176         spin_lock_init(&iommu->lock);
1177
1178         /*
1179          * if Caching mode is set, then invalid translations are tagged
1180          * with domainid 0. Hence we need to pre-allocate it.
1181          */
1182         if (cap_caching_mode(iommu->cap))
1183                 set_bit(0, iommu->domain_ids);
1184         return 0;
1185 }
1186
1187
1188 static void domain_exit(struct dmar_domain *domain);
1189 static void vm_domain_exit(struct dmar_domain *domain);
1190
1191 void free_dmar_iommu(struct intel_iommu *iommu)
1192 {
1193         struct dmar_domain *domain;
1194         int i;
1195         unsigned long flags;
1196
1197         i = find_first_bit(iommu->domain_ids, cap_ndoms(iommu->cap));
1198         for (; i < cap_ndoms(iommu->cap); ) {
1199                 domain = iommu->domains[i];
1200                 clear_bit(i, iommu->domain_ids);
1201
1202                 spin_lock_irqsave(&domain->iommu_lock, flags);
1203                 if (--domain->iommu_count == 0) {
1204                         if (domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE)
1205                                 vm_domain_exit(domain);
1206                         else
1207                                 domain_exit(domain);
1208                 }
1209                 spin_unlock_irqrestore(&domain->iommu_lock, flags);
1210
1211                 i = find_next_bit(iommu->domain_ids,
1212                         cap_ndoms(iommu->cap), i+1);
1213         }
1214
1215         if (iommu->gcmd & DMA_GCMD_TE)
1216                 iommu_disable_translation(iommu);
1217
1218         if (iommu->irq) {
1219                 set_irq_data(iommu->irq, NULL);
1220                 /* This will mask the irq */
1221                 free_irq(iommu->irq, iommu);
1222                 destroy_irq(iommu->irq);
1223         }
1224
1225         kfree(iommu->domains);
1226         kfree(iommu->domain_ids);
1227
1228         g_iommus[iommu->seq_id] = NULL;
1229
1230         /* if all iommus are freed, free g_iommus */
1231         for (i = 0; i < g_num_of_iommus; i++) {
1232                 if (g_iommus[i])
1233                         break;
1234         }
1235
1236         if (i == g_num_of_iommus)
1237                 kfree(g_iommus);
1238
1239         /* free context mapping */
1240         free_context_table(iommu);
1241 }
1242
1243 static struct dmar_domain *alloc_domain(void)
1244 {
1245         struct dmar_domain *domain;
1246
1247         domain = alloc_domain_mem();
1248         if (!domain)
1249                 return NULL;
1250
1251         memset(&domain->iommu_bmp, 0, sizeof(unsigned long));
1252         domain->flags = 0;
1253
1254         return domain;
1255 }
1256
1257 static int iommu_attach_domain(struct dmar_domain *domain,
1258                                struct intel_iommu *iommu)
1259 {
1260         int num;
1261         unsigned long ndomains;
1262         unsigned long flags;
1263
1264         ndomains = cap_ndoms(iommu->cap);
1265
1266         spin_lock_irqsave(&iommu->lock, flags);
1267
1268         num = find_first_zero_bit(iommu->domain_ids, ndomains);
1269         if (num >= ndomains) {
1270                 spin_unlock_irqrestore(&iommu->lock, flags);
1271                 printk(KERN_ERR "IOMMU: no free domain ids\n");
1272                 return -ENOMEM;
1273         }
1274
1275         domain->id = num;
1276         set_bit(num, iommu->domain_ids);
1277         set_bit(iommu->seq_id, &domain->iommu_bmp);
1278         iommu->domains[num] = domain;
1279         spin_unlock_irqrestore(&iommu->lock, flags);
1280
1281         return 0;
1282 }
1283
1284 static void iommu_detach_domain(struct dmar_domain *domain,
1285                                 struct intel_iommu *iommu)
1286 {
1287         unsigned long flags;
1288         int num, ndomains;
1289         int found = 0;
1290
1291         spin_lock_irqsave(&iommu->lock, flags);
1292         ndomains = cap_ndoms(iommu->cap);
1293         num = find_first_bit(iommu->domain_ids, ndomains);
1294         for (; num < ndomains; ) {
1295                 if (iommu->domains[num] == domain) {
1296                         found = 1;
1297                         break;
1298                 }
1299                 num = find_next_bit(iommu->domain_ids,
1300                                     cap_ndoms(iommu->cap), num+1);
1301         }
1302
1303         if (found) {
1304                 clear_bit(num, iommu->domain_ids);
1305                 clear_bit(iommu->seq_id, &domain->iommu_bmp);
1306                 iommu->domains[num] = NULL;
1307         }
1308         spin_unlock_irqrestore(&iommu->lock, flags);
1309 }
1310
1311 static struct iova_domain reserved_iova_list;
1312 static struct lock_class_key reserved_alloc_key;
1313 static struct lock_class_key reserved_rbtree_key;
1314
1315 static void dmar_init_reserved_ranges(void)
1316 {
1317         struct pci_dev *pdev = NULL;
1318         struct iova *iova;
1319         int i;
1320
1321         init_iova_domain(&reserved_iova_list, DMA_32BIT_PFN);
1322
1323         lockdep_set_class(&reserved_iova_list.iova_alloc_lock,
1324                 &reserved_alloc_key);
1325         lockdep_set_class(&reserved_iova_list.iova_rbtree_lock,
1326                 &reserved_rbtree_key);
1327
1328         /* IOAPIC ranges shouldn't be accessed by DMA */
1329         iova = reserve_iova(&reserved_iova_list, IOVA_PFN(IOAPIC_RANGE_START),
1330                 IOVA_PFN(IOAPIC_RANGE_END));
1331         if (!iova)
1332                 printk(KERN_ERR "Reserve IOAPIC range failed\n");
1333
1334         /* Reserve all PCI MMIO to avoid peer-to-peer access */
1335         for_each_pci_dev(pdev) {
1336                 struct resource *r;
1337
1338                 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
1339                         r = &pdev->resource[i];
1340                         if (!r->flags || !(r->flags & IORESOURCE_MEM))
1341                                 continue;
1342                         iova = reserve_iova(&reserved_iova_list,
1343                                             IOVA_PFN(r->start),
1344                                             IOVA_PFN(r->end));
1345                         if (!iova)
1346                                 printk(KERN_ERR "Reserve iova failed\n");
1347                 }
1348         }
1349
1350 }
1351
1352 static void domain_reserve_special_ranges(struct dmar_domain *domain)
1353 {
1354         copy_reserved_iova(&reserved_iova_list, &domain->iovad);
1355 }
1356
1357 static inline int guestwidth_to_adjustwidth(int gaw)
1358 {
1359         int agaw;
1360         int r = (gaw - 12) % 9;
1361
1362         if (r == 0)
1363                 agaw = gaw;
1364         else
1365                 agaw = gaw + 9 - r;
1366         if (agaw > 64)
1367                 agaw = 64;
1368         return agaw;
1369 }
1370
1371 static int domain_init(struct dmar_domain *domain, int guest_width)
1372 {
1373         struct intel_iommu *iommu;
1374         int adjust_width, agaw;
1375         unsigned long sagaw;
1376
1377         init_iova_domain(&domain->iovad, DMA_32BIT_PFN);
1378         spin_lock_init(&domain->iommu_lock);
1379
1380         domain_reserve_special_ranges(domain);
1381
1382         /* calculate AGAW */
1383         iommu = domain_get_iommu(domain);
1384         if (guest_width > cap_mgaw(iommu->cap))
1385                 guest_width = cap_mgaw(iommu->cap);
1386         domain->gaw = guest_width;
1387         adjust_width = guestwidth_to_adjustwidth(guest_width);
1388         agaw = width_to_agaw(adjust_width);
1389         sagaw = cap_sagaw(iommu->cap);
1390         if (!test_bit(agaw, &sagaw)) {
1391                 /* hardware doesn't support it, choose a bigger one */
1392                 pr_debug("IOMMU: hardware doesn't support agaw %d\n", agaw);
1393                 agaw = find_next_bit(&sagaw, 5, agaw);
1394                 if (agaw >= 5)
1395                         return -ENODEV;
1396         }
1397         domain->agaw = agaw;
1398         INIT_LIST_HEAD(&domain->devices);
1399
1400         if (ecap_coherent(iommu->ecap))
1401                 domain->iommu_coherency = 1;
1402         else
1403                 domain->iommu_coherency = 0;
1404
1405         if (ecap_sc_support(iommu->ecap))
1406                 domain->iommu_snooping = 1;
1407         else
1408                 domain->iommu_snooping = 0;
1409
1410         domain->iommu_count = 1;
1411
1412         /* always allocate the top pgd */
1413         domain->pgd = (struct dma_pte *)alloc_pgtable_page();
1414         if (!domain->pgd)
1415                 return -ENOMEM;
1416         __iommu_flush_cache(iommu, domain->pgd, PAGE_SIZE);
1417         return 0;
1418 }
1419
1420 static void domain_exit(struct dmar_domain *domain)
1421 {
1422         struct dmar_drhd_unit *drhd;
1423         struct intel_iommu *iommu;
1424
1425         /* Domain 0 is reserved, so dont process it */
1426         if (!domain)
1427                 return;
1428
1429         domain_remove_dev_info(domain);
1430         /* destroy iovas */
1431         put_iova_domain(&domain->iovad);
1432
1433         /* clear ptes */
1434         dma_pte_clear_range(domain, 0, DOMAIN_MAX_PFN(domain->gaw));
1435
1436         /* free page tables */
1437         dma_pte_free_pagetable(domain, 0, DOMAIN_MAX_PFN(domain->gaw));
1438
1439         for_each_active_iommu(iommu, drhd)
1440                 if (test_bit(iommu->seq_id, &domain->iommu_bmp))
1441                         iommu_detach_domain(domain, iommu);
1442
1443         free_domain_mem(domain);
1444 }
1445
1446 static int domain_context_mapping_one(struct dmar_domain *domain, int segment,
1447                                  u8 bus, u8 devfn, int translation)
1448 {
1449         struct context_entry *context;
1450         unsigned long flags;
1451         struct intel_iommu *iommu;
1452         struct dma_pte *pgd;
1453         unsigned long num;
1454         unsigned long ndomains;
1455         int id;
1456         int agaw;
1457         struct device_domain_info *info = NULL;
1458
1459         pr_debug("Set context mapping for %02x:%02x.%d\n",
1460                 bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
1461
1462         BUG_ON(!domain->pgd);
1463         BUG_ON(translation != CONTEXT_TT_PASS_THROUGH &&
1464                translation != CONTEXT_TT_MULTI_LEVEL);
1465
1466         iommu = device_to_iommu(segment, bus, devfn);
1467         if (!iommu)
1468                 return -ENODEV;
1469
1470         context = device_to_context_entry(iommu, bus, devfn);
1471         if (!context)
1472                 return -ENOMEM;
1473         spin_lock_irqsave(&iommu->lock, flags);
1474         if (context_present(context)) {
1475                 spin_unlock_irqrestore(&iommu->lock, flags);
1476                 return 0;
1477         }
1478
1479         id = domain->id;
1480         pgd = domain->pgd;
1481
1482         if (domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE ||
1483             domain->flags & DOMAIN_FLAG_STATIC_IDENTITY) {
1484                 int found = 0;
1485
1486                 /* find an available domain id for this device in iommu */
1487                 ndomains = cap_ndoms(iommu->cap);
1488                 num = find_first_bit(iommu->domain_ids, ndomains);
1489                 for (; num < ndomains; ) {
1490                         if (iommu->domains[num] == domain) {
1491                                 id = num;
1492                                 found = 1;
1493                                 break;
1494                         }
1495                         num = find_next_bit(iommu->domain_ids,
1496                                             cap_ndoms(iommu->cap), num+1);
1497                 }
1498
1499                 if (found == 0) {
1500                         num = find_first_zero_bit(iommu->domain_ids, ndomains);
1501                         if (num >= ndomains) {
1502                                 spin_unlock_irqrestore(&iommu->lock, flags);
1503                                 printk(KERN_ERR "IOMMU: no free domain ids\n");
1504                                 return -EFAULT;
1505                         }
1506
1507                         set_bit(num, iommu->domain_ids);
1508                         set_bit(iommu->seq_id, &domain->iommu_bmp);
1509                         iommu->domains[num] = domain;
1510                         id = num;
1511                 }
1512
1513                 /* Skip top levels of page tables for
1514                  * iommu which has less agaw than default.
1515                  */
1516                 for (agaw = domain->agaw; agaw != iommu->agaw; agaw--) {
1517                         pgd = phys_to_virt(dma_pte_addr(pgd));
1518                         if (!dma_pte_present(pgd)) {
1519                                 spin_unlock_irqrestore(&iommu->lock, flags);
1520                                 return -ENOMEM;
1521                         }
1522                 }
1523         }
1524
1525         context_set_domain_id(context, id);
1526
1527         if (translation != CONTEXT_TT_PASS_THROUGH) {
1528                 info = iommu_support_dev_iotlb(domain, segment, bus, devfn);
1529                 translation = info ? CONTEXT_TT_DEV_IOTLB :
1530                                      CONTEXT_TT_MULTI_LEVEL;
1531         }
1532         /*
1533          * In pass through mode, AW must be programmed to indicate the largest
1534          * AGAW value supported by hardware. And ASR is ignored by hardware.
1535          */
1536         if (unlikely(translation == CONTEXT_TT_PASS_THROUGH))
1537                 context_set_address_width(context, iommu->msagaw);
1538         else {
1539                 context_set_address_root(context, virt_to_phys(pgd));
1540                 context_set_address_width(context, iommu->agaw);
1541         }
1542
1543         context_set_translation_type(context, translation);
1544         context_set_fault_enable(context);
1545         context_set_present(context);
1546         domain_flush_cache(domain, context, sizeof(*context));
1547
1548         /*
1549          * It's a non-present to present mapping. If hardware doesn't cache
1550          * non-present entry we only need to flush the write-buffer. If the
1551          * _does_ cache non-present entries, then it does so in the special
1552          * domain #0, which we have to flush:
1553          */
1554         if (cap_caching_mode(iommu->cap)) {
1555                 iommu->flush.flush_context(iommu, 0,
1556                                            (((u16)bus) << 8) | devfn,
1557                                            DMA_CCMD_MASK_NOBIT,
1558                                            DMA_CCMD_DEVICE_INVL);
1559                 iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_DSI_FLUSH);
1560         } else {
1561                 iommu_flush_write_buffer(iommu);
1562         }
1563         iommu_enable_dev_iotlb(info);
1564         spin_unlock_irqrestore(&iommu->lock, flags);
1565
1566         spin_lock_irqsave(&domain->iommu_lock, flags);
1567         if (!test_and_set_bit(iommu->seq_id, &domain->iommu_bmp)) {
1568                 domain->iommu_count++;
1569                 domain_update_iommu_cap(domain);
1570         }
1571         spin_unlock_irqrestore(&domain->iommu_lock, flags);
1572         return 0;
1573 }
1574
1575 static int
1576 domain_context_mapping(struct dmar_domain *domain, struct pci_dev *pdev,
1577                         int translation)
1578 {
1579         int ret;
1580         struct pci_dev *tmp, *parent;
1581
1582         ret = domain_context_mapping_one(domain, pci_domain_nr(pdev->bus),
1583                                          pdev->bus->number, pdev->devfn,
1584                                          translation);
1585         if (ret)
1586                 return ret;
1587
1588         /* dependent device mapping */
1589         tmp = pci_find_upstream_pcie_bridge(pdev);
1590         if (!tmp)
1591                 return 0;
1592         /* Secondary interface's bus number and devfn 0 */
1593         parent = pdev->bus->self;
1594         while (parent != tmp) {
1595                 ret = domain_context_mapping_one(domain,
1596                                                  pci_domain_nr(parent->bus),
1597                                                  parent->bus->number,
1598                                                  parent->devfn, translation);
1599                 if (ret)
1600                         return ret;
1601                 parent = parent->bus->self;
1602         }
1603         if (tmp->is_pcie) /* this is a PCIE-to-PCI bridge */
1604                 return domain_context_mapping_one(domain,
1605                                         pci_domain_nr(tmp->subordinate),
1606                                         tmp->subordinate->number, 0,
1607                                         translation);
1608         else /* this is a legacy PCI bridge */
1609                 return domain_context_mapping_one(domain,
1610                                                   pci_domain_nr(tmp->bus),
1611                                                   tmp->bus->number,
1612                                                   tmp->devfn,
1613                                                   translation);
1614 }
1615
1616 static int domain_context_mapped(struct pci_dev *pdev)
1617 {
1618         int ret;
1619         struct pci_dev *tmp, *parent;
1620         struct intel_iommu *iommu;
1621
1622         iommu = device_to_iommu(pci_domain_nr(pdev->bus), pdev->bus->number,
1623                                 pdev->devfn);
1624         if (!iommu)
1625                 return -ENODEV;
1626
1627         ret = device_context_mapped(iommu, pdev->bus->number, pdev->devfn);
1628         if (!ret)
1629                 return ret;
1630         /* dependent device mapping */
1631         tmp = pci_find_upstream_pcie_bridge(pdev);
1632         if (!tmp)
1633                 return ret;
1634         /* Secondary interface's bus number and devfn 0 */
1635         parent = pdev->bus->self;
1636         while (parent != tmp) {
1637                 ret = device_context_mapped(iommu, parent->bus->number,
1638                                             parent->devfn);
1639                 if (!ret)
1640                         return ret;
1641                 parent = parent->bus->self;
1642         }
1643         if (tmp->is_pcie)
1644                 return device_context_mapped(iommu, tmp->subordinate->number,
1645                                              0);
1646         else
1647                 return device_context_mapped(iommu, tmp->bus->number,
1648                                              tmp->devfn);
1649 }
1650
1651 static int __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
1652                             struct scatterlist *sg, unsigned long phys_pfn,
1653                             unsigned long nr_pages, int prot)
1654 {
1655         struct dma_pte *first_pte = NULL, *pte = NULL;
1656         phys_addr_t uninitialized_var(pteval);
1657         int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT;
1658         unsigned long sg_res;
1659
1660         BUG_ON(addr_width < BITS_PER_LONG && (iov_pfn + nr_pages - 1) >> addr_width);
1661
1662         if ((prot & (DMA_PTE_READ|DMA_PTE_WRITE)) == 0)
1663                 return -EINVAL;
1664
1665         prot &= DMA_PTE_READ | DMA_PTE_WRITE | DMA_PTE_SNP;
1666
1667         if (sg)
1668                 sg_res = 0;
1669         else {
1670                 sg_res = nr_pages + 1;
1671                 pteval = ((phys_addr_t)phys_pfn << VTD_PAGE_SHIFT) | prot;
1672         }
1673
1674         while (nr_pages--) {
1675                 uint64_t tmp;
1676
1677                 if (!sg_res) {
1678                         sg_res = (sg->offset + sg->length + VTD_PAGE_SIZE - 1) >> VTD_PAGE_SHIFT;
1679                         sg->dma_address = ((dma_addr_t)iov_pfn << VTD_PAGE_SHIFT) + sg->offset;
1680                         sg->dma_length = sg->length;
1681                         pteval = page_to_phys(sg_page(sg)) | prot;
1682                 }
1683                 if (!pte) {
1684                         first_pte = pte = pfn_to_dma_pte(domain, iov_pfn);
1685                         if (!pte)
1686                                 return -ENOMEM;
1687                 }
1688                 /* We don't need lock here, nobody else
1689                  * touches the iova range
1690                  */
1691                 tmp = cmpxchg64_local(&pte->val, 0ULL, pteval);
1692                 if (tmp) {
1693                         static int dumps = 5;
1694                         printk(KERN_CRIT "ERROR: DMA PTE for vPFN 0x%lx already set (to %llx not %llx)\n",
1695                                iov_pfn, tmp, (unsigned long long)pteval);
1696                         if (dumps) {
1697                                 dumps--;
1698                                 debug_dma_dump_mappings(NULL);
1699                         }
1700                         WARN_ON(1);
1701                 }
1702                 pte++;
1703                 if (!nr_pages || first_pte_in_page(pte)) {
1704                         domain_flush_cache(domain, first_pte,
1705                                            (void *)pte - (void *)first_pte);
1706                         pte = NULL;
1707                 }
1708                 iov_pfn++;
1709                 pteval += VTD_PAGE_SIZE;
1710                 sg_res--;
1711                 if (!sg_res)
1712                         sg = sg_next(sg);
1713         }
1714         return 0;
1715 }
1716
1717 static inline int domain_sg_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
1718                                     struct scatterlist *sg, unsigned long nr_pages,
1719                                     int prot)
1720 {
1721         return __domain_mapping(domain, iov_pfn, sg, 0, nr_pages, prot);
1722 }
1723
1724 static inline int domain_pfn_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
1725                                      unsigned long phys_pfn, unsigned long nr_pages,
1726                                      int prot)
1727 {
1728         return __domain_mapping(domain, iov_pfn, NULL, phys_pfn, nr_pages, prot);
1729 }
1730
1731 static void iommu_detach_dev(struct intel_iommu *iommu, u8 bus, u8 devfn)
1732 {
1733         if (!iommu)
1734                 return;
1735
1736         clear_context_table(iommu, bus, devfn);
1737         iommu->flush.flush_context(iommu, 0, 0, 0,
1738                                            DMA_CCMD_GLOBAL_INVL);
1739         iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
1740 }
1741
1742 static void domain_remove_dev_info(struct dmar_domain *domain)
1743 {
1744         struct device_domain_info *info;
1745         unsigned long flags;
1746         struct intel_iommu *iommu;
1747
1748         spin_lock_irqsave(&device_domain_lock, flags);
1749         while (!list_empty(&domain->devices)) {
1750                 info = list_entry(domain->devices.next,
1751                         struct device_domain_info, link);
1752                 list_del(&info->link);
1753                 list_del(&info->global);
1754                 if (info->dev)
1755                         info->dev->dev.archdata.iommu = NULL;
1756                 spin_unlock_irqrestore(&device_domain_lock, flags);
1757
1758                 iommu_disable_dev_iotlb(info);
1759                 iommu = device_to_iommu(info->segment, info->bus, info->devfn);
1760                 iommu_detach_dev(iommu, info->bus, info->devfn);
1761                 free_devinfo_mem(info);
1762
1763                 spin_lock_irqsave(&device_domain_lock, flags);
1764         }
1765         spin_unlock_irqrestore(&device_domain_lock, flags);
1766 }
1767
1768 /*
1769  * find_domain
1770  * Note: we use struct pci_dev->dev.archdata.iommu stores the info
1771  */
1772 static struct dmar_domain *
1773 find_domain(struct pci_dev *pdev)
1774 {
1775         struct device_domain_info *info;
1776
1777         /* No lock here, assumes no domain exit in normal case */
1778         info = pdev->dev.archdata.iommu;
1779         if (info)
1780                 return info->domain;
1781         return NULL;
1782 }
1783
1784 /* domain is initialized */
1785 static struct dmar_domain *get_domain_for_dev(struct pci_dev *pdev, int gaw)
1786 {
1787         struct dmar_domain *domain, *found = NULL;
1788         struct intel_iommu *iommu;
1789         struct dmar_drhd_unit *drhd;
1790         struct device_domain_info *info, *tmp;
1791         struct pci_dev *dev_tmp;
1792         unsigned long flags;
1793         int bus = 0, devfn = 0;
1794         int segment;
1795         int ret;
1796
1797         domain = find_domain(pdev);
1798         if (domain)
1799                 return domain;
1800
1801         segment = pci_domain_nr(pdev->bus);
1802
1803         dev_tmp = pci_find_upstream_pcie_bridge(pdev);
1804         if (dev_tmp) {
1805                 if (dev_tmp->is_pcie) {
1806                         bus = dev_tmp->subordinate->number;
1807                         devfn = 0;
1808                 } else {
1809                         bus = dev_tmp->bus->number;
1810                         devfn = dev_tmp->devfn;
1811                 }
1812                 spin_lock_irqsave(&device_domain_lock, flags);
1813                 list_for_each_entry(info, &device_domain_list, global) {
1814                         if (info->segment == segment &&
1815                             info->bus == bus && info->devfn == devfn) {
1816                                 found = info->domain;
1817                                 break;
1818                         }
1819                 }
1820                 spin_unlock_irqrestore(&device_domain_lock, flags);
1821                 /* pcie-pci bridge already has a domain, uses it */
1822                 if (found) {
1823                         domain = found;
1824                         goto found_domain;
1825                 }
1826         }
1827
1828         domain = alloc_domain();
1829         if (!domain)
1830                 goto error;
1831
1832         /* Allocate new domain for the device */
1833         drhd = dmar_find_matched_drhd_unit(pdev);
1834         if (!drhd) {
1835                 printk(KERN_ERR "IOMMU: can't find DMAR for device %s\n",
1836                         pci_name(pdev));
1837                 return NULL;
1838         }
1839         iommu = drhd->iommu;
1840
1841         ret = iommu_attach_domain(domain, iommu);
1842         if (ret) {
1843                 domain_exit(domain);
1844                 goto error;
1845         }
1846
1847         if (domain_init(domain, gaw)) {
1848                 domain_exit(domain);
1849                 goto error;
1850         }
1851
1852         /* register pcie-to-pci device */
1853         if (dev_tmp) {
1854                 info = alloc_devinfo_mem();
1855                 if (!info) {
1856                         domain_exit(domain);
1857                         goto error;
1858                 }
1859                 info->segment = segment;
1860                 info->bus = bus;
1861                 info->devfn = devfn;
1862                 info->dev = NULL;
1863                 info->domain = domain;
1864                 /* This domain is shared by devices under p2p bridge */
1865                 domain->flags |= DOMAIN_FLAG_P2P_MULTIPLE_DEVICES;
1866
1867                 /* pcie-to-pci bridge already has a domain, uses it */
1868                 found = NULL;
1869                 spin_lock_irqsave(&device_domain_lock, flags);
1870                 list_for_each_entry(tmp, &device_domain_list, global) {
1871                         if (tmp->segment == segment &&
1872                             tmp->bus == bus && tmp->devfn == devfn) {
1873                                 found = tmp->domain;
1874                                 break;
1875                         }
1876                 }
1877                 if (found) {
1878                         free_devinfo_mem(info);
1879                         domain_exit(domain);
1880                         domain = found;
1881                 } else {
1882                         list_add(&info->link, &domain->devices);
1883                         list_add(&info->global, &device_domain_list);
1884                 }
1885                 spin_unlock_irqrestore(&device_domain_lock, flags);
1886         }
1887
1888 found_domain:
1889         info = alloc_devinfo_mem();
1890         if (!info)
1891                 goto error;
1892         info->segment = segment;
1893         info->bus = pdev->bus->number;
1894         info->devfn = pdev->devfn;
1895         info->dev = pdev;
1896         info->domain = domain;
1897         spin_lock_irqsave(&device_domain_lock, flags);
1898         /* somebody is fast */
1899         found = find_domain(pdev);
1900         if (found != NULL) {
1901                 spin_unlock_irqrestore(&device_domain_lock, flags);
1902                 if (found != domain) {
1903                         domain_exit(domain);
1904                         domain = found;
1905                 }
1906                 free_devinfo_mem(info);
1907                 return domain;
1908         }
1909         list_add(&info->link, &domain->devices);
1910         list_add(&info->global, &device_domain_list);
1911         pdev->dev.archdata.iommu = info;
1912         spin_unlock_irqrestore(&device_domain_lock, flags);
1913         return domain;
1914 error:
1915         /* recheck it here, maybe others set it */
1916         return find_domain(pdev);
1917 }
1918
1919 static int iommu_identity_mapping;
1920
1921 static int iommu_domain_identity_map(struct dmar_domain *domain,
1922                                      unsigned long long start,
1923                                      unsigned long long end)
1924 {
1925         unsigned long first_vpfn = start >> VTD_PAGE_SHIFT;
1926         unsigned long last_vpfn = end >> VTD_PAGE_SHIFT;
1927
1928         if (!reserve_iova(&domain->iovad, dma_to_mm_pfn(first_vpfn),
1929                           dma_to_mm_pfn(last_vpfn))) {
1930                 printk(KERN_ERR "IOMMU: reserve iova failed\n");
1931                 return -ENOMEM;
1932         }
1933
1934         pr_debug("Mapping reserved region %llx-%llx for domain %d\n",
1935                  start, end, domain->id);
1936         /*
1937          * RMRR range might have overlap with physical memory range,
1938          * clear it first
1939          */
1940         dma_pte_clear_range(domain, first_vpfn, last_vpfn);
1941
1942         return domain_pfn_mapping(domain, first_vpfn, first_vpfn,
1943                                   last_vpfn - first_vpfn + 1,
1944                                   DMA_PTE_READ|DMA_PTE_WRITE);
1945 }
1946
1947 static int iommu_prepare_identity_map(struct pci_dev *pdev,
1948                                       unsigned long long start,
1949                                       unsigned long long end)
1950 {
1951         struct dmar_domain *domain;
1952         int ret;
1953
1954         printk(KERN_INFO
1955                "IOMMU: Setting identity map for device %s [0x%Lx - 0x%Lx]\n",
1956                pci_name(pdev), start, end);
1957
1958         domain = get_domain_for_dev(pdev, DEFAULT_DOMAIN_ADDRESS_WIDTH);
1959         if (!domain)
1960                 return -ENOMEM;
1961
1962         ret = iommu_domain_identity_map(domain, start, end);
1963         if (ret)
1964                 goto error;
1965
1966         /* context entry init */
1967         ret = domain_context_mapping(domain, pdev, CONTEXT_TT_MULTI_LEVEL);
1968         if (ret)
1969                 goto error;
1970
1971         return 0;
1972
1973  error:
1974         domain_exit(domain);
1975         return ret;
1976 }
1977
1978 static inline int iommu_prepare_rmrr_dev(struct dmar_rmrr_unit *rmrr,
1979         struct pci_dev *pdev)
1980 {
1981         if (pdev->dev.archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO)
1982                 return 0;
1983         return iommu_prepare_identity_map(pdev, rmrr->base_address,
1984                 rmrr->end_address + 1);
1985 }
1986
1987 #ifdef CONFIG_DMAR_FLOPPY_WA
1988 static inline void iommu_prepare_isa(void)
1989 {
1990         struct pci_dev *pdev;
1991         int ret;
1992
1993         pdev = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, NULL);
1994         if (!pdev)
1995                 return;
1996
1997         printk(KERN_INFO "IOMMU: Prepare 0-16MiB unity mapping for LPC\n");
1998         ret = iommu_prepare_identity_map(pdev, 0, 16*1024*1024);
1999
2000         if (ret)
2001                 printk(KERN_ERR "IOMMU: Failed to create 0-16MiB identity map; "
2002                        "floppy might not work\n");
2003
2004 }
2005 #else
2006 static inline void iommu_prepare_isa(void)
2007 {
2008         return;
2009 }
2010 #endif /* !CONFIG_DMAR_FLPY_WA */
2011
2012 /* Initialize each context entry as pass through.*/
2013 static int __init init_context_pass_through(void)
2014 {
2015         struct pci_dev *pdev = NULL;
2016         struct dmar_domain *domain;
2017         int ret;
2018
2019         for_each_pci_dev(pdev) {
2020                 domain = get_domain_for_dev(pdev, DEFAULT_DOMAIN_ADDRESS_WIDTH);
2021                 ret = domain_context_mapping(domain, pdev,
2022                                              CONTEXT_TT_PASS_THROUGH);
2023                 if (ret)
2024                         return ret;
2025         }
2026         return 0;
2027 }
2028
2029 static int md_domain_init(struct dmar_domain *domain, int guest_width);
2030
2031 static int __init si_domain_work_fn(unsigned long start_pfn,
2032                                     unsigned long end_pfn, void *datax)
2033 {
2034         int *ret = datax;
2035
2036         *ret = iommu_domain_identity_map(si_domain,
2037                                          (uint64_t)start_pfn << PAGE_SHIFT,
2038                                          (uint64_t)end_pfn << PAGE_SHIFT);
2039         return *ret;
2040
2041 }
2042
2043 static int si_domain_init(void)
2044 {
2045         struct dmar_drhd_unit *drhd;
2046         struct intel_iommu *iommu;
2047         int nid, ret = 0;
2048
2049         si_domain = alloc_domain();
2050         if (!si_domain)
2051                 return -EFAULT;
2052
2053         pr_debug("Identity mapping domain is domain %d\n", si_domain->id);
2054
2055         for_each_active_iommu(iommu, drhd) {
2056                 ret = iommu_attach_domain(si_domain, iommu);
2057                 if (ret) {
2058                         domain_exit(si_domain);
2059                         return -EFAULT;
2060                 }
2061         }
2062
2063         if (md_domain_init(si_domain, DEFAULT_DOMAIN_ADDRESS_WIDTH)) {
2064                 domain_exit(si_domain);
2065                 return -EFAULT;
2066         }
2067
2068         si_domain->flags = DOMAIN_FLAG_STATIC_IDENTITY;
2069
2070         for_each_online_node(nid) {
2071                 work_with_active_regions(nid, si_domain_work_fn, &ret);
2072                 if (ret)
2073                         return ret;
2074         }
2075
2076         return 0;
2077 }
2078
2079 static void domain_remove_one_dev_info(struct dmar_domain *domain,
2080                                           struct pci_dev *pdev);
2081 static int identity_mapping(struct pci_dev *pdev)
2082 {
2083         struct device_domain_info *info;
2084
2085         if (likely(!iommu_identity_mapping))
2086                 return 0;
2087
2088
2089         list_for_each_entry(info, &si_domain->devices, link)
2090                 if (info->dev == pdev)
2091                         return 1;
2092         return 0;
2093 }
2094
2095 static int domain_add_dev_info(struct dmar_domain *domain,
2096                                   struct pci_dev *pdev)
2097 {
2098         struct device_domain_info *info;
2099         unsigned long flags;
2100
2101         info = alloc_devinfo_mem();
2102         if (!info)
2103                 return -ENOMEM;
2104
2105         info->segment = pci_domain_nr(pdev->bus);
2106         info->bus = pdev->bus->number;
2107         info->devfn = pdev->devfn;
2108         info->dev = pdev;
2109         info->domain = domain;
2110
2111         spin_lock_irqsave(&device_domain_lock, flags);
2112         list_add(&info->link, &domain->devices);
2113         list_add(&info->global, &device_domain_list);
2114         pdev->dev.archdata.iommu = info;
2115         spin_unlock_irqrestore(&device_domain_lock, flags);
2116
2117         return 0;
2118 }
2119
2120 static int iommu_prepare_static_identity_mapping(void)
2121 {
2122         struct pci_dev *pdev = NULL;
2123         int ret;
2124
2125         ret = si_domain_init();
2126         if (ret)
2127                 return -EFAULT;
2128
2129         for_each_pci_dev(pdev) {
2130                 if (iommu_identity_mapping == 1 || IS_GFX_DEVICE(pdev)) {
2131                         printk(KERN_INFO "IOMMU: identity mapping for device %s\n",
2132                                pci_name(pdev));
2133
2134                         ret = domain_context_mapping(si_domain, pdev,
2135                                                      CONTEXT_TT_MULTI_LEVEL);
2136                         if (ret)
2137                                 return ret;
2138                         ret = domain_add_dev_info(si_domain, pdev);
2139                         if (ret)
2140                                 return ret;
2141                 }
2142         }
2143
2144         return 0;
2145 }
2146
2147 int __init init_dmars(void)
2148 {
2149         struct dmar_drhd_unit *drhd;
2150         struct dmar_rmrr_unit *rmrr;
2151         struct pci_dev *pdev;
2152         struct intel_iommu *iommu;
2153         int i, ret;
2154         int pass_through = 1;
2155
2156         /*
2157          * In case pass through can not be enabled, iommu tries to use identity
2158          * mapping.
2159          */
2160         if (iommu_pass_through)
2161                 iommu_identity_mapping = 1;
2162
2163         /*
2164          * for each drhd
2165          *    allocate root
2166          *    initialize and program root entry to not present
2167          * endfor
2168          */
2169         for_each_drhd_unit(drhd) {
2170                 g_num_of_iommus++;
2171                 /*
2172                  * lock not needed as this is only incremented in the single
2173                  * threaded kernel __init code path all other access are read
2174                  * only
2175                  */
2176         }
2177
2178         g_iommus = kcalloc(g_num_of_iommus, sizeof(struct intel_iommu *),
2179                         GFP_KERNEL);
2180         if (!g_iommus) {
2181                 printk(KERN_ERR "Allocating global iommu array failed\n");
2182                 ret = -ENOMEM;
2183                 goto error;
2184         }
2185
2186         deferred_flush = kzalloc(g_num_of_iommus *
2187                 sizeof(struct deferred_flush_tables), GFP_KERNEL);
2188         if (!deferred_flush) {
2189                 kfree(g_iommus);
2190                 ret = -ENOMEM;
2191                 goto error;
2192         }
2193
2194         for_each_drhd_unit(drhd) {
2195                 if (drhd->ignored)
2196                         continue;
2197
2198                 iommu = drhd->iommu;
2199                 g_iommus[iommu->seq_id] = iommu;
2200
2201                 ret = iommu_init_domains(iommu);
2202                 if (ret)
2203                         goto error;
2204
2205                 /*
2206                  * TBD:
2207                  * we could share the same root & context tables
2208                  * amoung all IOMMU's. Need to Split it later.
2209                  */
2210                 ret = iommu_alloc_root_entry(iommu);
2211                 if (ret) {
2212                         printk(KERN_ERR "IOMMU: allocate root entry failed\n");
2213                         goto error;
2214                 }
2215                 if (!ecap_pass_through(iommu->ecap))
2216                         pass_through = 0;
2217         }
2218         if (iommu_pass_through)
2219                 if (!pass_through) {
2220                         printk(KERN_INFO
2221                                "Pass Through is not supported by hardware.\n");
2222                         iommu_pass_through = 0;
2223                 }
2224
2225         /*
2226          * Start from the sane iommu hardware state.
2227          */
2228         for_each_drhd_unit(drhd) {
2229                 if (drhd->ignored)
2230                         continue;
2231
2232                 iommu = drhd->iommu;
2233
2234                 /*
2235                  * If the queued invalidation is already initialized by us
2236                  * (for example, while enabling interrupt-remapping) then
2237                  * we got the things already rolling from a sane state.
2238                  */
2239                 if (iommu->qi)
2240                         continue;
2241
2242                 /*
2243                  * Clear any previous faults.
2244                  */
2245                 dmar_fault(-1, iommu);
2246                 /*
2247                  * Disable queued invalidation if supported and already enabled
2248                  * before OS handover.
2249                  */
2250                 dmar_disable_qi(iommu);
2251         }
2252
2253         for_each_drhd_unit(drhd) {
2254                 if (drhd->ignored)
2255                         continue;
2256
2257                 iommu = drhd->iommu;
2258
2259                 if (dmar_enable_qi(iommu)) {
2260                         /*
2261                          * Queued Invalidate not enabled, use Register Based
2262                          * Invalidate
2263                          */
2264                         iommu->flush.flush_context = __iommu_flush_context;
2265                         iommu->flush.flush_iotlb = __iommu_flush_iotlb;
2266                         printk(KERN_INFO "IOMMU 0x%Lx: using Register based "
2267                                "invalidation\n",
2268                                (unsigned long long)drhd->reg_base_addr);
2269                 } else {
2270                         iommu->flush.flush_context = qi_flush_context;
2271                         iommu->flush.flush_iotlb = qi_flush_iotlb;
2272                         printk(KERN_INFO "IOMMU 0x%Lx: using Queued "
2273                                "invalidation\n",
2274                                (unsigned long long)drhd->reg_base_addr);
2275                 }
2276         }
2277
2278         /*
2279          * If pass through is set and enabled, context entries of all pci
2280          * devices are intialized by pass through translation type.
2281          */
2282         if (iommu_pass_through) {
2283                 ret = init_context_pass_through();
2284                 if (ret) {
2285                         printk(KERN_ERR "IOMMU: Pass through init failed.\n");
2286                         iommu_pass_through = 0;
2287                 }
2288         }
2289
2290         /*
2291          * If pass through is not set or not enabled, setup context entries for
2292          * identity mappings for rmrr, gfx, and isa and may fall back to static
2293          * identity mapping if iommu_identity_mapping is set.
2294          */
2295         if (!iommu_pass_through) {
2296 #ifdef CONFIG_DMAR_BROKEN_GFX_WA
2297                 if (!iommu_identity_mapping)
2298                         iommu_identity_mapping = 2;
2299 #endif
2300                 if (iommu_identity_mapping)
2301                         iommu_prepare_static_identity_mapping();
2302                 /*
2303                  * For each rmrr
2304                  *   for each dev attached to rmrr
2305                  *   do
2306                  *     locate drhd for dev, alloc domain for dev
2307                  *     allocate free domain
2308                  *     allocate page table entries for rmrr
2309                  *     if context not allocated for bus
2310                  *           allocate and init context
2311                  *           set present in root table for this bus
2312                  *     init context with domain, translation etc
2313                  *    endfor
2314                  * endfor
2315                  */
2316                 printk(KERN_INFO "IOMMU: Setting RMRR:\n");
2317                 for_each_rmrr_units(rmrr) {
2318                         for (i = 0; i < rmrr->devices_cnt; i++) {
2319                                 pdev = rmrr->devices[i];
2320                                 /*
2321                                  * some BIOS lists non-exist devices in DMAR
2322                                  * table.
2323                                  */
2324                                 if (!pdev)
2325                                         continue;
2326                                 ret = iommu_prepare_rmrr_dev(rmrr, pdev);
2327                                 if (ret)
2328                                         printk(KERN_ERR
2329                                  "IOMMU: mapping reserved region failed\n");
2330                         }
2331                 }
2332
2333                 iommu_prepare_isa();
2334         }
2335
2336         /*
2337          * for each drhd
2338          *   enable fault log
2339          *   global invalidate context cache
2340          *   global invalidate iotlb
2341          *   enable translation
2342          */
2343         for_each_drhd_unit(drhd) {
2344                 if (drhd->ignored)
2345                         continue;
2346                 iommu = drhd->iommu;
2347
2348                 iommu_flush_write_buffer(iommu);
2349
2350                 ret = dmar_set_interrupt(iommu);
2351                 if (ret)
2352                         goto error;
2353
2354                 iommu_set_root_entry(iommu);
2355
2356                 iommu->flush.flush_context(iommu, 0, 0, 0, DMA_CCMD_GLOBAL_INVL);
2357                 iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
2358                 iommu_disable_protect_mem_regions(iommu);
2359
2360                 ret = iommu_enable_translation(iommu);
2361                 if (ret)
2362                         goto error;
2363         }
2364
2365         return 0;
2366 error:
2367         for_each_drhd_unit(drhd) {
2368                 if (drhd->ignored)
2369                         continue;
2370                 iommu = drhd->iommu;
2371                 free_iommu(iommu);
2372         }
2373         kfree(g_iommus);
2374         return ret;
2375 }
2376
2377 /* Returns a number of VTD pages, but aligned to MM page size */
2378 static inline unsigned long aligned_nrpages(unsigned long host_addr,
2379                                             size_t size)
2380 {
2381         host_addr &= ~PAGE_MASK;
2382         return PAGE_ALIGN(host_addr + size) >> VTD_PAGE_SHIFT;
2383 }
2384
2385 /* This takes a number of _MM_ pages, not VTD pages */
2386 static struct iova *intel_alloc_iova(struct device *dev,
2387                                      struct dmar_domain *domain,
2388                                      unsigned long nrpages, uint64_t dma_mask)
2389 {
2390         struct pci_dev *pdev = to_pci_dev(dev);
2391         struct iova *iova = NULL;
2392
2393         /* Restrict dma_mask to the width that the iommu can handle */
2394         dma_mask = min_t(uint64_t, DOMAIN_MAX_ADDR(domain->gaw), dma_mask);
2395
2396         if (!dmar_forcedac && dma_mask > DMA_BIT_MASK(32)) {
2397                 /*
2398                  * First try to allocate an io virtual address in
2399                  * DMA_BIT_MASK(32) and if that fails then try allocating
2400                  * from higher range
2401                  */
2402                 iova = alloc_iova(&domain->iovad, nrpages,
2403                                   IOVA_PFN(DMA_BIT_MASK(32)), 1);
2404                 if (iova)
2405                         return iova;
2406         }
2407         iova = alloc_iova(&domain->iovad, nrpages, IOVA_PFN(dma_mask), 1);
2408         if (unlikely(!iova)) {
2409                 printk(KERN_ERR "Allocating %ld-page iova for %s failed",
2410                        nrpages, pci_name(pdev));
2411                 return NULL;
2412         }
2413
2414         return iova;
2415 }
2416
2417 static struct dmar_domain *
2418 get_valid_domain_for_dev(struct pci_dev *pdev)
2419 {
2420         struct dmar_domain *domain;
2421         int ret;
2422
2423         domain = get_domain_for_dev(pdev,
2424                         DEFAULT_DOMAIN_ADDRESS_WIDTH);
2425         if (!domain) {
2426                 printk(KERN_ERR
2427                         "Allocating domain for %s failed", pci_name(pdev));
2428                 return NULL;
2429         }
2430
2431         /* make sure context mapping is ok */
2432         if (unlikely(!domain_context_mapped(pdev))) {
2433                 ret = domain_context_mapping(domain, pdev,
2434                                              CONTEXT_TT_MULTI_LEVEL);
2435                 if (ret) {
2436                         printk(KERN_ERR
2437                                 "Domain context map for %s failed",
2438                                 pci_name(pdev));
2439                         return NULL;
2440                 }
2441         }
2442
2443         return domain;
2444 }
2445
2446 static int iommu_dummy(struct pci_dev *pdev)
2447 {
2448         return pdev->dev.archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO;
2449 }
2450
2451 static int iommu_should_identity_map(struct pci_dev *pdev)
2452 {
2453         if (iommu_identity_mapping == 2)
2454                 return IS_GFX_DEVICE(pdev);
2455         else
2456                 return pdev->dma_mask > DMA_BIT_MASK(32);
2457 }
2458
2459 /* Check if the pdev needs to go through non-identity map and unmap process.*/
2460 static int iommu_no_mapping(struct pci_dev *pdev)
2461 {
2462         int found;
2463
2464         if (iommu_dummy(pdev))
2465                 return 1;
2466
2467         if (!iommu_identity_mapping)
2468                 return 0;
2469
2470         found = identity_mapping(pdev);
2471         if (found) {
2472                 if (iommu_should_identity_map(pdev))
2473                         return 1;
2474                 else {
2475                         /*
2476                          * 32 bit DMA is removed from si_domain and fall back
2477                          * to non-identity mapping.
2478                          */
2479                         domain_remove_one_dev_info(si_domain, pdev);
2480                         printk(KERN_INFO "32bit %s uses non-identity mapping\n",
2481                                pci_name(pdev));
2482                         return 0;
2483                 }
2484         } else {
2485                 /*
2486                  * In case of a detached 64 bit DMA device from vm, the device
2487                  * is put into si_domain for identity mapping.
2488                  */
2489                 if (iommu_should_identity_map(pdev)) {
2490                         int ret;
2491                         ret = domain_add_dev_info(si_domain, pdev);
2492                         if (ret)
2493                                 return 0;
2494                         ret = domain_context_mapping(si_domain, pdev, CONTEXT_TT_MULTI_LEVEL);
2495                         if (!ret) {
2496                                 printk(KERN_INFO "64bit %s uses identity mapping\n",
2497                                        pci_name(pdev));
2498                                 return 1;
2499                         }
2500                 }
2501         }
2502
2503         return 0;
2504 }
2505
2506 static dma_addr_t __intel_map_single(struct device *hwdev, phys_addr_t paddr,
2507                                      size_t size, int dir, u64 dma_mask)
2508 {
2509         struct pci_dev *pdev = to_pci_dev(hwdev);
2510         struct dmar_domain *domain;
2511         phys_addr_t start_paddr;
2512         struct iova *iova;
2513         int prot = 0;
2514         int ret;
2515         struct intel_iommu *iommu;
2516
2517         BUG_ON(dir == DMA_NONE);
2518
2519         if (iommu_no_mapping(pdev))
2520                 return paddr;
2521
2522         domain = get_valid_domain_for_dev(pdev);
2523         if (!domain)
2524                 return 0;
2525
2526         iommu = domain_get_iommu(domain);
2527         size = aligned_nrpages(paddr, size);
2528
2529         iova = intel_alloc_iova(hwdev, domain, dma_to_mm_pfn(size),
2530                                 pdev->dma_mask);
2531         if (!iova)
2532                 goto error;
2533
2534         /*
2535          * Check if DMAR supports zero-length reads on write only
2536          * mappings..
2537          */
2538         if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL || \
2539                         !cap_zlr(iommu->cap))
2540                 prot |= DMA_PTE_READ;
2541         if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)
2542                 prot |= DMA_PTE_WRITE;
2543         /*
2544          * paddr - (paddr + size) might be partial page, we should map the whole
2545          * page.  Note: if two part of one page are separately mapped, we
2546          * might have two guest_addr mapping to the same host paddr, but this
2547          * is not a big problem
2548          */
2549         ret = domain_pfn_mapping(domain, mm_to_dma_pfn(iova->pfn_lo),
2550                                  paddr >> VTD_PAGE_SHIFT, size, prot);
2551         if (ret)
2552                 goto error;
2553
2554         /* it's a non-present to present mapping. Only flush if caching mode */
2555         if (cap_caching_mode(iommu->cap))
2556                 iommu_flush_iotlb_psi(iommu, 0, mm_to_dma_pfn(iova->pfn_lo), size);
2557         else
2558                 iommu_flush_write_buffer(iommu);
2559
2560         start_paddr = (phys_addr_t)iova->pfn_lo << PAGE_SHIFT;
2561         start_paddr += paddr & ~PAGE_MASK;
2562         return start_paddr;
2563
2564 error:
2565         if (iova)
2566                 __free_iova(&domain->iovad, iova);
2567         printk(KERN_ERR"Device %s request: %zx@%llx dir %d --- failed\n",
2568                 pci_name(pdev), size, (unsigned long long)paddr, dir);
2569         return 0;
2570 }
2571
2572 static dma_addr_t intel_map_page(struct device *dev, struct page *page,
2573                                  unsigned long offset, size_t size,
2574                                  enum dma_data_direction dir,
2575                                  struct dma_attrs *attrs)
2576 {
2577         return __intel_map_single(dev, page_to_phys(page) + offset, size,
2578                                   dir, to_pci_dev(dev)->dma_mask);
2579 }
2580
2581 static void flush_unmaps(void)
2582 {
2583         int i, j;
2584
2585         timer_on = 0;
2586
2587         /* just flush them all */
2588         for (i = 0; i < g_num_of_iommus; i++) {
2589                 struct intel_iommu *iommu = g_iommus[i];
2590                 if (!iommu)
2591                         continue;
2592
2593                 if (!deferred_flush[i].next)
2594                         continue;
2595
2596                 iommu->flush.flush_iotlb(iommu, 0, 0, 0,
2597                                          DMA_TLB_GLOBAL_FLUSH);
2598                 for (j = 0; j < deferred_flush[i].next; j++) {
2599                         unsigned long mask;
2600                         struct iova *iova = deferred_flush[i].iova[j];
2601
2602                         mask = (iova->pfn_hi - iova->pfn_lo + 1) << PAGE_SHIFT;
2603                         mask = ilog2(mask >> VTD_PAGE_SHIFT);
2604                         iommu_flush_dev_iotlb(deferred_flush[i].domain[j],
2605                                         iova->pfn_lo << PAGE_SHIFT, mask);
2606                         __free_iova(&deferred_flush[i].domain[j]->iovad, iova);
2607                 }
2608                 deferred_flush[i].next = 0;
2609         }
2610
2611         list_size = 0;
2612 }
2613
2614 static void flush_unmaps_timeout(unsigned long data)
2615 {
2616         unsigned long flags;
2617
2618         spin_lock_irqsave(&async_umap_flush_lock, flags);
2619         flush_unmaps();
2620         spin_unlock_irqrestore(&async_umap_flush_lock, flags);
2621 }
2622
2623 static void add_unmap(struct dmar_domain *dom, struct iova *iova)
2624 {
2625         unsigned long flags;
2626         int next, iommu_id;
2627         struct intel_iommu *iommu;
2628
2629         spin_lock_irqsave(&async_umap_flush_lock, flags);
2630         if (list_size == HIGH_WATER_MARK)
2631                 flush_unmaps();
2632
2633         iommu = domain_get_iommu(dom);
2634         iommu_id = iommu->seq_id;
2635
2636         next = deferred_flush[iommu_id].next;
2637         deferred_flush[iommu_id].domain[next] = dom;
2638         deferred_flush[iommu_id].iova[next] = iova;
2639         deferred_flush[iommu_id].next++;
2640
2641         if (!timer_on) {
2642                 mod_timer(&unmap_timer, jiffies + msecs_to_jiffies(10));
2643                 timer_on = 1;
2644         }
2645         list_size++;
2646         spin_unlock_irqrestore(&async_umap_flush_lock, flags);
2647 }
2648
2649 static void intel_unmap_page(struct device *dev, dma_addr_t dev_addr,
2650                              size_t size, enum dma_data_direction dir,
2651                              struct dma_attrs *attrs)
2652 {
2653         struct pci_dev *pdev = to_pci_dev(dev);
2654         struct dmar_domain *domain;
2655         unsigned long start_pfn, last_pfn;
2656         struct iova *iova;
2657         struct intel_iommu *iommu;
2658
2659         if (iommu_no_mapping(pdev))
2660                 return;
2661
2662         domain = find_domain(pdev);
2663         BUG_ON(!domain);
2664
2665         iommu = domain_get_iommu(domain);
2666
2667         iova = find_iova(&domain->iovad, IOVA_PFN(dev_addr));
2668         if (WARN_ONCE(!iova, "Driver unmaps unmatched page at PFN %llx\n",
2669                       (unsigned long long)dev_addr))
2670                 return;
2671
2672         start_pfn = mm_to_dma_pfn(iova->pfn_lo);
2673         last_pfn = mm_to_dma_pfn(iova->pfn_hi + 1) - 1;
2674
2675         pr_debug("Device %s unmapping: pfn %lx-%lx\n",
2676                  pci_name(pdev), start_pfn, last_pfn);
2677
2678         /*  clear the whole page */
2679         dma_pte_clear_range(domain, start_pfn, last_pfn);
2680
2681         /* free page tables */
2682         dma_pte_free_pagetable(domain, start_pfn, last_pfn);
2683
2684         if (intel_iommu_strict) {
2685                 iommu_flush_iotlb_psi(iommu, domain->id, start_pfn,
2686                                       last_pfn - start_pfn + 1);
2687                 /* free iova */
2688                 __free_iova(&domain->iovad, iova);
2689         } else {
2690                 add_unmap(domain, iova);
2691                 /*
2692                  * queue up the release of the unmap to save the 1/6th of the
2693                  * cpu used up by the iotlb flush operation...
2694                  */
2695         }
2696 }
2697
2698 static void intel_unmap_single(struct device *dev, dma_addr_t dev_addr, size_t size,
2699                                int dir)
2700 {
2701         intel_unmap_page(dev, dev_addr, size, dir, NULL);
2702 }
2703
2704 static void *intel_alloc_coherent(struct device *hwdev, size_t size,
2705                                   dma_addr_t *dma_handle, gfp_t flags)
2706 {
2707         void *vaddr;
2708         int order;
2709
2710         size = PAGE_ALIGN(size);
2711         order = get_order(size);
2712         flags &= ~(GFP_DMA | GFP_DMA32);
2713
2714         vaddr = (void *)__get_free_pages(flags, order);
2715         if (!vaddr)
2716                 return NULL;
2717         memset(vaddr, 0, size);
2718
2719         *dma_handle = __intel_map_single(hwdev, virt_to_bus(vaddr), size,
2720                                          DMA_BIDIRECTIONAL,
2721                                          hwdev->coherent_dma_mask);
2722         if (*dma_handle)
2723                 return vaddr;
2724         free_pages((unsigned long)vaddr, order);
2725         return NULL;
2726 }
2727
2728 static void intel_free_coherent(struct device *hwdev, size_t size, void *vaddr,
2729                                 dma_addr_t dma_handle)
2730 {
2731         int order;
2732
2733         size = PAGE_ALIGN(size);
2734         order = get_order(size);
2735
2736         intel_unmap_single(hwdev, dma_handle, size, DMA_BIDIRECTIONAL);
2737         free_pages((unsigned long)vaddr, order);
2738 }
2739
2740 static void intel_unmap_sg(struct device *hwdev, struct scatterlist *sglist,
2741                            int nelems, enum dma_data_direction dir,
2742                            struct dma_attrs *attrs)
2743 {
2744         struct pci_dev *pdev = to_pci_dev(hwdev);
2745         struct dmar_domain *domain;
2746         unsigned long start_pfn, last_pfn;
2747         struct iova *iova;
2748         struct intel_iommu *iommu;
2749
2750         if (iommu_no_mapping(pdev))
2751                 return;
2752
2753         domain = find_domain(pdev);
2754         BUG_ON(!domain);
2755
2756         iommu = domain_get_iommu(domain);
2757
2758         iova = find_iova(&domain->iovad, IOVA_PFN(sglist[0].dma_address));
2759         if (WARN_ONCE(!iova, "Driver unmaps unmatched sglist at PFN %llx\n",
2760                       (unsigned long long)sglist[0].dma_address))
2761                 return;
2762
2763         start_pfn = mm_to_dma_pfn(iova->pfn_lo);
2764         last_pfn = mm_to_dma_pfn(iova->pfn_hi + 1) - 1;
2765
2766         /*  clear the whole page */
2767         dma_pte_clear_range(domain, start_pfn, last_pfn);
2768
2769         /* free page tables */
2770         dma_pte_free_pagetable(domain, start_pfn, last_pfn);
2771
2772         iommu_flush_iotlb_psi(iommu, domain->id, start_pfn,
2773                               (last_pfn - start_pfn + 1));
2774
2775         /* free iova */
2776         __free_iova(&domain->iovad, iova);
2777 }
2778
2779 static int intel_nontranslate_map_sg(struct device *hddev,
2780         struct scatterlist *sglist, int nelems, int dir)
2781 {
2782         int i;
2783         struct scatterlist *sg;
2784
2785         for_each_sg(sglist, sg, nelems, i) {
2786                 BUG_ON(!sg_page(sg));
2787                 sg->dma_address = page_to_phys(sg_page(sg)) + sg->offset;
2788                 sg->dma_length = sg->length;
2789         }
2790         return nelems;
2791 }
2792
2793 static int intel_map_sg(struct device *hwdev, struct scatterlist *sglist, int nelems,
2794                         enum dma_data_direction dir, struct dma_attrs *attrs)
2795 {
2796         int i;
2797         struct pci_dev *pdev = to_pci_dev(hwdev);
2798         struct dmar_domain *domain;
2799         size_t size = 0;
2800         int prot = 0;
2801         size_t offset_pfn = 0;
2802         struct iova *iova = NULL;
2803         int ret;
2804         struct scatterlist *sg;
2805         unsigned long start_vpfn;
2806         struct intel_iommu *iommu;
2807
2808         BUG_ON(dir == DMA_NONE);
2809         if (iommu_no_mapping(pdev))
2810                 return intel_nontranslate_map_sg(hwdev, sglist, nelems, dir);
2811
2812         domain = get_valid_domain_for_dev(pdev);
2813         if (!domain)
2814                 return 0;
2815
2816         iommu = domain_get_iommu(domain);
2817
2818         for_each_sg(sglist, sg, nelems, i)
2819                 size += aligned_nrpages(sg->offset, sg->length);
2820
2821         iova = intel_alloc_iova(hwdev, domain, dma_to_mm_pfn(size),
2822                                 pdev->dma_mask);
2823         if (!iova) {
2824                 sglist->dma_length = 0;
2825                 return 0;
2826         }
2827
2828         /*
2829          * Check if DMAR supports zero-length reads on write only
2830          * mappings..
2831          */
2832         if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL || \
2833                         !cap_zlr(iommu->cap))
2834                 prot |= DMA_PTE_READ;
2835         if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)
2836                 prot |= DMA_PTE_WRITE;
2837
2838         start_vpfn = mm_to_dma_pfn(iova->pfn_lo);
2839
2840         ret = domain_sg_mapping(domain, start_vpfn, sglist, mm_to_dma_pfn(size), prot);
2841         if (unlikely(ret)) {
2842                 /*  clear the page */
2843                 dma_pte_clear_range(domain, start_vpfn,
2844                                     start_vpfn + size - 1);
2845                 /* free page tables */
2846                 dma_pte_free_pagetable(domain, start_vpfn,
2847                                        start_vpfn + size - 1);
2848                 /* free iova */
2849                 __free_iova(&domain->iovad, iova);
2850                 return 0;
2851         }
2852
2853         /* it's a non-present to present mapping. Only flush if caching mode */
2854         if (cap_caching_mode(iommu->cap))
2855                 iommu_flush_iotlb_psi(iommu, 0, start_vpfn, offset_pfn);
2856         else
2857                 iommu_flush_write_buffer(iommu);
2858
2859         return nelems;
2860 }
2861
2862 static int intel_mapping_error(struct device *dev, dma_addr_t dma_addr)
2863 {
2864         return !dma_addr;
2865 }
2866
2867 struct dma_map_ops intel_dma_ops = {
2868         .alloc_coherent = intel_alloc_coherent,
2869         .free_coherent = intel_free_coherent,
2870         .map_sg = intel_map_sg,
2871         .unmap_sg = intel_unmap_sg,
2872         .map_page = intel_map_page,
2873         .unmap_page = intel_unmap_page,
2874         .mapping_error = intel_mapping_error,
2875 };
2876
2877 static inline int iommu_domain_cache_init(void)
2878 {
2879         int ret = 0;
2880
2881         iommu_domain_cache = kmem_cache_create("iommu_domain",
2882                                          sizeof(struct dmar_domain),
2883                                          0,
2884                                          SLAB_HWCACHE_ALIGN,
2885
2886                                          NULL);
2887         if (!iommu_domain_cache) {
2888                 printk(KERN_ERR "Couldn't create iommu_domain cache\n");
2889                 ret = -ENOMEM;
2890         }
2891
2892         return ret;
2893 }
2894
2895 static inline int iommu_devinfo_cache_init(void)
2896 {
2897         int ret = 0;
2898
2899         iommu_devinfo_cache = kmem_cache_create("iommu_devinfo",
2900                                          sizeof(struct device_domain_info),
2901                                          0,
2902                                          SLAB_HWCACHE_ALIGN,
2903                                          NULL);
2904         if (!iommu_devinfo_cache) {
2905                 printk(KERN_ERR "Couldn't create devinfo cache\n");
2906                 ret = -ENOMEM;
2907         }
2908
2909         return ret;
2910 }
2911
2912 static inline int iommu_iova_cache_init(void)
2913 {
2914         int ret = 0;
2915
2916         iommu_iova_cache = kmem_cache_create("iommu_iova",
2917                                          sizeof(struct iova),
2918                                          0,
2919                                          SLAB_HWCACHE_ALIGN,
2920                                          NULL);
2921         if (!iommu_iova_cache) {
2922                 printk(KERN_ERR "Couldn't create iova cache\n");
2923                 ret = -ENOMEM;
2924         }
2925
2926         return ret;
2927 }
2928
2929 static int __init iommu_init_mempool(void)
2930 {
2931         int ret;
2932         ret = iommu_iova_cache_init();
2933         if (ret)
2934                 return ret;
2935
2936         ret = iommu_domain_cache_init();
2937         if (ret)
2938                 goto domain_error;
2939
2940         ret = iommu_devinfo_cache_init();
2941         if (!ret)
2942                 return ret;
2943
2944         kmem_cache_destroy(iommu_domain_cache);
2945 domain_error:
2946         kmem_cache_destroy(iommu_iova_cache);
2947
2948         return -ENOMEM;
2949 }
2950
2951 static void __init iommu_exit_mempool(void)
2952 {
2953         kmem_cache_destroy(iommu_devinfo_cache);
2954         kmem_cache_destroy(iommu_domain_cache);
2955         kmem_cache_destroy(iommu_iova_cache);
2956
2957 }
2958
2959 static void __init init_no_remapping_devices(void)
2960 {
2961         struct dmar_drhd_unit *drhd;
2962
2963         for_each_drhd_unit(drhd) {
2964                 if (!drhd->include_all) {
2965                         int i;
2966                         for (i = 0; i < drhd->devices_cnt; i++)
2967                                 if (drhd->devices[i] != NULL)
2968                                         break;
2969                         /* ignore DMAR unit if no pci devices exist */
2970                         if (i == drhd->devices_cnt)
2971                                 drhd->ignored = 1;
2972                 }
2973         }
2974
2975         if (dmar_map_gfx)
2976                 return;
2977
2978         for_each_drhd_unit(drhd) {
2979                 int i;
2980                 if (drhd->ignored || drhd->include_all)
2981                         continue;
2982
2983                 for (i = 0; i < drhd->devices_cnt; i++)
2984                         if (drhd->devices[i] &&
2985                                 !IS_GFX_DEVICE(drhd->devices[i]))
2986                                 break;
2987
2988                 if (i < drhd->devices_cnt)
2989                         continue;
2990
2991                 /* bypass IOMMU if it is just for gfx devices */
2992                 drhd->ignored = 1;
2993                 for (i = 0; i < drhd->devices_cnt; i++) {
2994                         if (!drhd->devices[i])
2995                                 continue;
2996                         drhd->devices[i]->dev.archdata.iommu = DUMMY_DEVICE_DOMAIN_INFO;
2997                 }
2998         }
2999 }
3000
3001 #ifdef CONFIG_SUSPEND
3002 static int init_iommu_hw(void)
3003 {
3004         struct dmar_drhd_unit *drhd;
3005         struct intel_iommu *iommu = NULL;
3006
3007         for_each_active_iommu(iommu, drhd)
3008                 if (iommu->qi)
3009                         dmar_reenable_qi(iommu);
3010
3011         for_each_active_iommu(iommu, drhd) {
3012                 iommu_flush_write_buffer(iommu);
3013
3014                 iommu_set_root_entry(iommu);
3015
3016                 iommu->flush.flush_context(iommu, 0, 0, 0,
3017                                            DMA_CCMD_GLOBAL_INVL);
3018                 iommu->flush.flush_iotlb(iommu, 0, 0, 0,
3019                                          DMA_TLB_GLOBAL_FLUSH);
3020                 iommu_disable_protect_mem_regions(iommu);
3021                 iommu_enable_translation(iommu);
3022         }
3023
3024         return 0;
3025 }
3026
3027 static void iommu_flush_all(void)
3028 {
3029         struct dmar_drhd_unit *drhd;
3030         struct intel_iommu *iommu;
3031
3032         for_each_active_iommu(iommu, drhd) {
3033                 iommu->flush.flush_context(iommu, 0, 0, 0,
3034                                            DMA_CCMD_GLOBAL_INVL);
3035                 iommu->flush.flush_iotlb(iommu, 0, 0, 0,
3036                                          DMA_TLB_GLOBAL_FLUSH);
3037         }
3038 }
3039
3040 static int iommu_suspend(struct sys_device *dev, pm_message_t state)
3041 {
3042         struct dmar_drhd_unit *drhd;
3043         struct intel_iommu *iommu = NULL;
3044         unsigned long flag;
3045
3046         for_each_active_iommu(iommu, drhd) {
3047                 iommu->iommu_state = kzalloc(sizeof(u32) * MAX_SR_DMAR_REGS,
3048                                                  GFP_ATOMIC);
3049                 if (!iommu->iommu_state)
3050                         goto nomem;
3051         }
3052
3053         iommu_flush_all();
3054
3055         for_each_active_iommu(iommu, drhd) {
3056                 iommu_disable_translation(iommu);
3057
3058                 spin_lock_irqsave(&iommu->register_lock, flag);
3059
3060                 iommu->iommu_state[SR_DMAR_FECTL_REG] =
3061                         readl(iommu->reg + DMAR_FECTL_REG);
3062                 iommu->iommu_state[SR_DMAR_FEDATA_REG] =
3063                         readl(iommu->reg + DMAR_FEDATA_REG);
3064                 iommu->iommu_state[SR_DMAR_FEADDR_REG] =
3065                         readl(iommu->reg + DMAR_FEADDR_REG);
3066                 iommu->iommu_state[SR_DMAR_FEUADDR_REG] =
3067                         readl(iommu->reg + DMAR_FEUADDR_REG);
3068
3069                 spin_unlock_irqrestore(&iommu->register_lock, flag);
3070         }
3071         return 0;
3072
3073 nomem:
3074         for_each_active_iommu(iommu, drhd)
3075                 kfree(iommu->iommu_state);
3076
3077         return -ENOMEM;
3078 }
3079
3080 static int iommu_resume(struct sys_device *dev)
3081 {
3082         struct dmar_drhd_unit *drhd;
3083         struct intel_iommu *iommu = NULL;
3084         unsigned long flag;
3085
3086         if (init_iommu_hw()) {
3087                 WARN(1, "IOMMU setup failed, DMAR can not resume!\n");
3088                 return -EIO;
3089         }
3090
3091         for_each_active_iommu(iommu, drhd) {
3092
3093                 spin_lock_irqsave(&iommu->register_lock, flag);
3094
3095                 writel(iommu->iommu_state[SR_DMAR_FECTL_REG],
3096                         iommu->reg + DMAR_FECTL_REG);
3097                 writel(iommu->iommu_state[SR_DMAR_FEDATA_REG],
3098                         iommu->reg + DMAR_FEDATA_REG);
3099                 writel(iommu->iommu_state[SR_DMAR_FEADDR_REG],
3100                         iommu->reg + DMAR_FEADDR_REG);
3101                 writel(iommu->iommu_state[SR_DMAR_FEUADDR_REG],
3102                         iommu->reg + DMAR_FEUADDR_REG);
3103
3104                 spin_unlock_irqrestore(&iommu->register_lock, flag);
3105         }
3106
3107         for_each_active_iommu(iommu, drhd)
3108                 kfree(iommu->iommu_state);
3109
3110         return 0;
3111 }
3112
3113 static struct sysdev_class iommu_sysclass = {
3114         .name           = "iommu",
3115         .resume         = iommu_resume,
3116         .suspend        = iommu_suspend,
3117 };
3118
3119 static struct sys_device device_iommu = {
3120         .cls    = &iommu_sysclass,
3121 };
3122
3123 static int __init init_iommu_sysfs(void)
3124 {
3125         int error;
3126
3127         error = sysdev_class_register(&iommu_sysclass);
3128         if (error)
3129                 return error;
3130
3131         error = sysdev_register(&device_iommu);
3132         if (error)
3133                 sysdev_class_unregister(&iommu_sysclass);
3134
3135         return error;
3136 }
3137
3138 #else
3139 static int __init init_iommu_sysfs(void)
3140 {
3141         return 0;
3142 }
3143 #endif  /* CONFIG_PM */
3144
3145 int __init intel_iommu_init(void)
3146 {
3147         int ret = 0;
3148
3149         if (dmar_table_init())
3150                 return  -ENODEV;
3151
3152         if (dmar_dev_scope_init())
3153                 return  -ENODEV;
3154
3155         /*
3156          * Check the need for DMA-remapping initialization now.
3157          * Above initialization will also be used by Interrupt-remapping.
3158          */
3159         if (no_iommu || (swiotlb && !iommu_pass_through) || dmar_disabled)
3160                 return -ENODEV;
3161
3162         iommu_init_mempool();
3163         dmar_init_reserved_ranges();
3164
3165         init_no_remapping_devices();
3166
3167         ret = init_dmars();
3168         if (ret) {
3169                 printk(KERN_ERR "IOMMU: dmar init failed\n");
3170                 put_iova_domain(&reserved_iova_list);
3171                 iommu_exit_mempool();
3172                 return ret;
3173         }
3174         printk(KERN_INFO
3175         "PCI-DMA: Intel(R) Virtualization Technology for Directed I/O\n");
3176
3177         init_timer(&unmap_timer);
3178         force_iommu = 1;
3179
3180         if (!iommu_pass_through) {
3181                 printk(KERN_INFO
3182                        "Multi-level page-table translation for DMAR.\n");
3183                 dma_ops = &intel_dma_ops;
3184         } else
3185                 printk(KERN_INFO
3186                        "DMAR: Pass through translation for DMAR.\n");
3187
3188         init_iommu_sysfs();
3189
3190         register_iommu(&intel_iommu_ops);
3191
3192         return 0;
3193 }
3194
3195 static void iommu_detach_dependent_devices(struct intel_iommu *iommu,
3196                                            struct pci_dev *pdev)
3197 {
3198         struct pci_dev *tmp, *parent;
3199
3200         if (!iommu || !pdev)
3201                 return;
3202
3203         /* dependent device detach */
3204         tmp = pci_find_upstream_pcie_bridge(pdev);
3205         /* Secondary interface's bus number and devfn 0 */
3206         if (tmp) {
3207                 parent = pdev->bus->self;
3208                 while (parent != tmp) {
3209                         iommu_detach_dev(iommu, parent->bus->number,
3210                                          parent->devfn);
3211                         parent = parent->bus->self;
3212                 }
3213                 if (tmp->is_pcie) /* this is a PCIE-to-PCI bridge */
3214                         iommu_detach_dev(iommu,
3215                                 tmp->subordinate->number, 0);
3216                 else /* this is a legacy PCI bridge */
3217                         iommu_detach_dev(iommu, tmp->bus->number,
3218                                          tmp->devfn);
3219         }
3220 }
3221
3222 static void domain_remove_one_dev_info(struct dmar_domain *domain,
3223                                           struct pci_dev *pdev)
3224 {
3225         struct device_domain_info *info;
3226         struct intel_iommu *iommu;
3227         unsigned long flags;
3228         int found = 0;
3229         struct list_head *entry, *tmp;
3230
3231         iommu = device_to_iommu(pci_domain_nr(pdev->bus), pdev->bus->number,
3232                                 pdev->devfn);
3233         if (!iommu)
3234                 return;
3235
3236         spin_lock_irqsave(&device_domain_lock, flags);
3237         list_for_each_safe(entry, tmp, &domain->devices) {
3238                 info = list_entry(entry, struct device_domain_info, link);
3239                 /* No need to compare PCI domain; it has to be the same */
3240                 if (info->bus == pdev->bus->number &&
3241                     info->devfn == pdev->devfn) {
3242                         list_del(&info->link);
3243                         list_del(&info->global);
3244                         if (info->dev)
3245                                 info->dev->dev.archdata.iommu = NULL;
3246                         spin_unlock_irqrestore(&device_domain_lock, flags);
3247
3248                         iommu_disable_dev_iotlb(info);
3249                         iommu_detach_dev(iommu, info->bus, info->devfn);
3250                         iommu_detach_dependent_devices(iommu, pdev);
3251                         free_devinfo_mem(info);
3252
3253                         spin_lock_irqsave(&device_domain_lock, flags);
3254
3255                         if (found)
3256                                 break;
3257                         else
3258                                 continue;
3259                 }
3260
3261                 /* if there is no other devices under the same iommu
3262                  * owned by this domain, clear this iommu in iommu_bmp
3263                  * update iommu count and coherency
3264                  */
3265                 if (iommu == device_to_iommu(info->segment, info->bus,
3266                                             info->devfn))
3267                         found = 1;
3268         }
3269
3270         if (found == 0) {
3271                 unsigned long tmp_flags;
3272                 spin_lock_irqsave(&domain->iommu_lock, tmp_flags);
3273                 clear_bit(iommu->seq_id, &domain->iommu_bmp);
3274                 domain->iommu_count--;
3275                 domain_update_iommu_cap(domain);
3276                 spin_unlock_irqrestore(&domain->iommu_lock, tmp_flags);
3277         }
3278
3279         spin_unlock_irqrestore(&device_domain_lock, flags);
3280 }
3281
3282 static void vm_domain_remove_all_dev_info(struct dmar_domain *domain)
3283 {
3284         struct device_domain_info *info;
3285         struct intel_iommu *iommu;
3286         unsigned long flags1, flags2;
3287
3288         spin_lock_irqsave(&device_domain_lock, flags1);
3289         while (!list_empty(&domain->devices)) {
3290                 info = list_entry(domain->devices.next,
3291                         struct device_domain_info, link);
3292                 list_del(&info->link);
3293                 list_del(&info->global);
3294                 if (info->dev)
3295                         info->dev->dev.archdata.iommu = NULL;
3296
3297                 spin_unlock_irqrestore(&device_domain_lock, flags1);
3298
3299                 iommu_disable_dev_iotlb(info);
3300                 iommu = device_to_iommu(info->segment, info->bus, info->devfn);
3301                 iommu_detach_dev(iommu, info->bus, info->devfn);
3302                 iommu_detach_dependent_devices(iommu, info->dev);
3303
3304                 /* clear this iommu in iommu_bmp, update iommu count
3305                  * and capabilities
3306                  */
3307                 spin_lock_irqsave(&domain->iommu_lock, flags2);
3308                 if (test_and_clear_bit(iommu->seq_id,
3309                                        &domain->iommu_bmp)) {
3310                         domain->iommu_count--;
3311                         domain_update_iommu_cap(domain);
3312                 }
3313                 spin_unlock_irqrestore(&domain->iommu_lock, flags2);
3314
3315                 free_devinfo_mem(info);
3316                 spin_lock_irqsave(&device_domain_lock, flags1);
3317         }
3318         spin_unlock_irqrestore(&device_domain_lock, flags1);
3319 }
3320
3321 /* domain id for virtual machine, it won't be set in context */
3322 static unsigned long vm_domid;
3323
3324 static int vm_domain_min_agaw(struct dmar_domain *domain)
3325 {
3326         int i;
3327         int min_agaw = domain->agaw;
3328
3329         i = find_first_bit(&domain->iommu_bmp, g_num_of_iommus);
3330         for (; i < g_num_of_iommus; ) {
3331                 if (min_agaw > g_iommus[i]->agaw)
3332                         min_agaw = g_iommus[i]->agaw;
3333
3334                 i = find_next_bit(&domain->iommu_bmp, g_num_of_iommus, i+1);
3335         }
3336
3337         return min_agaw;
3338 }
3339
3340 static struct dmar_domain *iommu_alloc_vm_domain(void)
3341 {
3342         struct dmar_domain *domain;
3343
3344         domain = alloc_domain_mem();
3345         if (!domain)
3346                 return NULL;
3347
3348         domain->id = vm_domid++;
3349         memset(&domain->iommu_bmp, 0, sizeof(unsigned long));
3350         domain->flags = DOMAIN_FLAG_VIRTUAL_MACHINE;
3351
3352         return domain;
3353 }
3354
3355 static int md_domain_init(struct dmar_domain *domain, int guest_width)
3356 {
3357         int adjust_width;
3358
3359         init_iova_domain(&domain->iovad, DMA_32BIT_PFN);
3360         spin_lock_init(&domain->iommu_lock);
3361
3362         domain_reserve_special_ranges(domain);
3363
3364         /* calculate AGAW */
3365         domain->gaw = guest_width;
3366         adjust_width = guestwidth_to_adjustwidth(guest_width);
3367         domain->agaw = width_to_agaw(adjust_width);
3368
3369         INIT_LIST_HEAD(&domain->devices);
3370
3371         domain->iommu_count = 0;
3372         domain->iommu_coherency = 0;
3373         domain->max_addr = 0;
3374
3375         /* always allocate the top pgd */
3376         domain->pgd = (struct dma_pte *)alloc_pgtable_page();
3377         if (!domain->pgd)
3378                 return -ENOMEM;
3379         domain_flush_cache(domain, domain->pgd, PAGE_SIZE);
3380         return 0;
3381 }
3382
3383 static void iommu_free_vm_domain(struct dmar_domain *domain)
3384 {
3385         unsigned long flags;
3386         struct dmar_drhd_unit *drhd;
3387         struct intel_iommu *iommu;
3388         unsigned long i;
3389         unsigned long ndomains;
3390
3391         for_each_drhd_unit(drhd) {
3392                 if (drhd->ignored)
3393                         continue;
3394                 iommu = drhd->iommu;
3395
3396                 ndomains = cap_ndoms(iommu->cap);
3397                 i = find_first_bit(iommu->domain_ids, ndomains);
3398                 for (; i < ndomains; ) {
3399                         if (iommu->domains[i] == domain) {
3400                                 spin_lock_irqsave(&iommu->lock, flags);
3401                                 clear_bit(i, iommu->domain_ids);
3402                                 iommu->domains[i] = NULL;
3403                                 spin_unlock_irqrestore(&iommu->lock, flags);
3404                                 break;
3405                         }
3406                         i = find_next_bit(iommu->domain_ids, ndomains, i+1);
3407                 }
3408         }
3409 }
3410
3411 static void vm_domain_exit(struct dmar_domain *domain)
3412 {
3413         /* Domain 0 is reserved, so dont process it */
3414         if (!domain)
3415                 return;
3416
3417         vm_domain_remove_all_dev_info(domain);
3418         /* destroy iovas */
3419         put_iova_domain(&domain->iovad);
3420
3421         /* clear ptes */
3422         dma_pte_clear_range(domain, 0, DOMAIN_MAX_PFN(domain->gaw));
3423
3424         /* free page tables */
3425         dma_pte_free_pagetable(domain, 0, DOMAIN_MAX_PFN(domain->gaw));
3426
3427         iommu_free_vm_domain(domain);
3428         free_domain_mem(domain);
3429 }
3430
3431 static int intel_iommu_domain_init(struct iommu_domain *domain)
3432 {
3433         struct dmar_domain *dmar_domain;
3434
3435         dmar_domain = iommu_alloc_vm_domain();
3436         if (!dmar_domain) {
3437                 printk(KERN_ERR
3438                         "intel_iommu_domain_init: dmar_domain == NULL\n");
3439                 return -ENOMEM;
3440         }
3441         if (md_domain_init(dmar_domain, DEFAULT_DOMAIN_ADDRESS_WIDTH)) {
3442                 printk(KERN_ERR
3443                         "intel_iommu_domain_init() failed\n");
3444                 vm_domain_exit(dmar_domain);
3445                 return -ENOMEM;
3446         }
3447         domain->priv = dmar_domain;
3448
3449         return 0;
3450 }
3451
3452 static void intel_iommu_domain_destroy(struct iommu_domain *domain)
3453 {
3454         struct dmar_domain *dmar_domain = domain->priv;
3455
3456         domain->priv = NULL;
3457         vm_domain_exit(dmar_domain);
3458 }
3459
3460 static int intel_iommu_attach_device(struct iommu_domain *domain,
3461                                      struct device *dev)
3462 {
3463         struct dmar_domain *dmar_domain = domain->priv;
3464         struct pci_dev *pdev = to_pci_dev(dev);
3465         struct intel_iommu *iommu;
3466         int addr_width;
3467         u64 end;
3468         int ret;
3469
3470         /* normally pdev is not mapped */
3471         if (unlikely(domain_context_mapped(pdev))) {
3472                 struct dmar_domain *old_domain;
3473
3474                 old_domain = find_domain(pdev);
3475                 if (old_domain) {
3476                         if (dmar_domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE ||
3477                             dmar_domain->flags & DOMAIN_FLAG_STATIC_IDENTITY)
3478                                 domain_remove_one_dev_info(old_domain, pdev);
3479                         else
3480                                 domain_remove_dev_info(old_domain);
3481                 }
3482         }
3483
3484         iommu = device_to_iommu(pci_domain_nr(pdev->bus), pdev->bus->number,
3485                                 pdev->devfn);
3486         if (!iommu)
3487                 return -ENODEV;
3488
3489         /* check if this iommu agaw is sufficient for max mapped address */
3490         addr_width = agaw_to_width(iommu->agaw);
3491         end = DOMAIN_MAX_ADDR(addr_width);
3492         end = end & VTD_PAGE_MASK;
3493         if (end < dmar_domain->max_addr) {
3494                 printk(KERN_ERR "%s: iommu agaw (%d) is not "
3495                        "sufficient for the mapped address (%llx)\n",
3496                        __func__, iommu->agaw, dmar_domain->max_addr);
3497                 return -EFAULT;
3498         }
3499
3500         ret = domain_add_dev_info(dmar_domain, pdev);
3501         if (ret)
3502                 return ret;
3503
3504         ret = domain_context_mapping(dmar_domain, pdev, CONTEXT_TT_MULTI_LEVEL);
3505         return ret;
3506 }
3507
3508 static void intel_iommu_detach_device(struct iommu_domain *domain,
3509                                       struct device *dev)
3510 {
3511         struct dmar_domain *dmar_domain = domain->priv;
3512         struct pci_dev *pdev = to_pci_dev(dev);
3513
3514         domain_remove_one_dev_info(dmar_domain, pdev);
3515 }
3516
3517 static int intel_iommu_map_range(struct iommu_domain *domain,
3518                                  unsigned long iova, phys_addr_t hpa,
3519                                  size_t size, int iommu_prot)
3520 {
3521         struct dmar_domain *dmar_domain = domain->priv;
3522         u64 max_addr;
3523         int addr_width;
3524         int prot = 0;
3525         int ret;
3526
3527         if (iommu_prot & IOMMU_READ)
3528                 prot |= DMA_PTE_READ;
3529         if (iommu_prot & IOMMU_WRITE)
3530                 prot |= DMA_PTE_WRITE;
3531         if ((iommu_prot & IOMMU_CACHE) && dmar_domain->iommu_snooping)
3532                 prot |= DMA_PTE_SNP;
3533
3534         max_addr = iova + size;
3535         if (dmar_domain->max_addr < max_addr) {
3536                 int min_agaw;
3537                 u64 end;
3538
3539                 /* check if minimum agaw is sufficient for mapped address */
3540                 min_agaw = vm_domain_min_agaw(dmar_domain);
3541                 addr_width = agaw_to_width(min_agaw);
3542                 end = DOMAIN_MAX_ADDR(addr_width);
3543                 end = end & VTD_PAGE_MASK;
3544                 if (end < max_addr) {
3545                         printk(KERN_ERR "%s: iommu agaw (%d) is not "
3546                                "sufficient for the mapped address (%llx)\n",
3547                                __func__, min_agaw, max_addr);
3548                         return -EFAULT;
3549                 }
3550                 dmar_domain->max_addr = max_addr;
3551         }
3552         /* Round up size to next multiple of PAGE_SIZE, if it and
3553            the low bits of hpa would take us onto the next page */
3554         size = aligned_nrpages(hpa, size);
3555         ret = domain_pfn_mapping(dmar_domain, iova >> VTD_PAGE_SHIFT,
3556                                  hpa >> VTD_PAGE_SHIFT, size, prot);
3557         return ret;
3558 }
3559
3560 static void intel_iommu_unmap_range(struct iommu_domain *domain,
3561                                     unsigned long iova, size_t size)
3562 {
3563         struct dmar_domain *dmar_domain = domain->priv;
3564
3565         dma_pte_clear_range(dmar_domain, iova >> VTD_PAGE_SHIFT,
3566                             (iova + size - 1) >> VTD_PAGE_SHIFT);
3567
3568         if (dmar_domain->max_addr == iova + size)
3569                 dmar_domain->max_addr = iova;
3570 }
3571
3572 static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain,
3573                                             unsigned long iova)
3574 {
3575         struct dmar_domain *dmar_domain = domain->priv;
3576         struct dma_pte *pte;
3577         u64 phys = 0;
3578
3579         pte = pfn_to_dma_pte(dmar_domain, iova >> VTD_PAGE_SHIFT);
3580         if (pte)
3581                 phys = dma_pte_addr(pte);
3582
3583         return phys;
3584 }
3585
3586 static int intel_iommu_domain_has_cap(struct iommu_domain *domain,
3587                                       unsigned long cap)
3588 {
3589         struct dmar_domain *dmar_domain = domain->priv;
3590
3591         if (cap == IOMMU_CAP_CACHE_COHERENCY)
3592                 return dmar_domain->iommu_snooping;
3593
3594         return 0;
3595 }
3596
3597 static struct iommu_ops intel_iommu_ops = {
3598         .domain_init    = intel_iommu_domain_init,
3599         .domain_destroy = intel_iommu_domain_destroy,
3600         .attach_dev     = intel_iommu_attach_device,
3601         .detach_dev     = intel_iommu_detach_device,
3602         .map            = intel_iommu_map_range,
3603         .unmap          = intel_iommu_unmap_range,
3604         .iova_to_phys   = intel_iommu_iova_to_phys,
3605         .domain_has_cap = intel_iommu_domain_has_cap,
3606 };
3607
3608 static void __devinit quirk_iommu_rwbf(struct pci_dev *dev)
3609 {
3610         /*
3611          * Mobile 4 Series Chipset neglects to set RWBF capability,
3612          * but needs it:
3613          */
3614         printk(KERN_INFO "DMAR: Forcing write-buffer flush capability\n");
3615         rwbf_quirk = 1;
3616 }
3617
3618 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2a40, quirk_iommu_rwbf);