intel-iommu: include linux/dmi.h to use dmi_ routines
[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 <linux/dmi.h>
41 #include <asm/cacheflush.h>
42 #include <asm/iommu.h>
43 #include "pci.h"
44
45 #define ROOT_SIZE               VTD_PAGE_SIZE
46 #define CONTEXT_SIZE            VTD_PAGE_SIZE
47
48 #define IS_GFX_DEVICE(pdev) ((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY)
49 #define IS_ISA_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA)
50
51 #define IOAPIC_RANGE_START      (0xfee00000)
52 #define IOAPIC_RANGE_END        (0xfeefffff)
53 #define IOVA_START_ADDR         (0x1000)
54
55 #define DEFAULT_DOMAIN_ADDRESS_WIDTH 48
56
57 #define MAX_AGAW_WIDTH 64
58
59 #define DOMAIN_MAX_ADDR(gaw) ((((u64)1) << gaw) - 1)
60 #define DOMAIN_MAX_PFN(gaw)  ((((u64)1) << (gaw-VTD_PAGE_SHIFT)) - 1)
61
62 #define IOVA_PFN(addr)          ((addr) >> PAGE_SHIFT)
63 #define DMA_32BIT_PFN           IOVA_PFN(DMA_BIT_MASK(32))
64 #define DMA_64BIT_PFN           IOVA_PFN(DMA_BIT_MASK(64))
65
66
67 /* VT-d pages must always be _smaller_ than MM pages. Otherwise things
68    are never going to work. */
69 static inline unsigned long dma_to_mm_pfn(unsigned long dma_pfn)
70 {
71         return dma_pfn >> (PAGE_SHIFT - VTD_PAGE_SHIFT);
72 }
73
74 static inline unsigned long mm_to_dma_pfn(unsigned long mm_pfn)
75 {
76         return mm_pfn << (PAGE_SHIFT - VTD_PAGE_SHIFT);
77 }
78 static inline unsigned long page_to_dma_pfn(struct page *pg)
79 {
80         return mm_to_dma_pfn(page_to_pfn(pg));
81 }
82 static inline unsigned long virt_to_dma_pfn(void *p)
83 {
84         return page_to_dma_pfn(virt_to_page(p));
85 }
86
87 /* global iommu list, set NULL for ignored DMAR units */
88 static struct intel_iommu **g_iommus;
89
90 static int rwbf_quirk;
91
92 /*
93  * 0: Present
94  * 1-11: Reserved
95  * 12-63: Context Ptr (12 - (haw-1))
96  * 64-127: Reserved
97  */
98 struct root_entry {
99         u64     val;
100         u64     rsvd1;
101 };
102 #define ROOT_ENTRY_NR (VTD_PAGE_SIZE/sizeof(struct root_entry))
103 static inline bool root_present(struct root_entry *root)
104 {
105         return (root->val & 1);
106 }
107 static inline void set_root_present(struct root_entry *root)
108 {
109         root->val |= 1;
110 }
111 static inline void set_root_value(struct root_entry *root, unsigned long value)
112 {
113         root->val |= value & VTD_PAGE_MASK;
114 }
115
116 static inline struct context_entry *
117 get_context_addr_from_root(struct root_entry *root)
118 {
119         return (struct context_entry *)
120                 (root_present(root)?phys_to_virt(
121                 root->val & VTD_PAGE_MASK) :
122                 NULL);
123 }
124
125 /*
126  * low 64 bits:
127  * 0: present
128  * 1: fault processing disable
129  * 2-3: translation type
130  * 12-63: address space root
131  * high 64 bits:
132  * 0-2: address width
133  * 3-6: aval
134  * 8-23: domain id
135  */
136 struct context_entry {
137         u64 lo;
138         u64 hi;
139 };
140
141 static inline bool context_present(struct context_entry *context)
142 {
143         return (context->lo & 1);
144 }
145 static inline void context_set_present(struct context_entry *context)
146 {
147         context->lo |= 1;
148 }
149
150 static inline void context_set_fault_enable(struct context_entry *context)
151 {
152         context->lo &= (((u64)-1) << 2) | 1;
153 }
154
155 static inline void context_set_translation_type(struct context_entry *context,
156                                                 unsigned long value)
157 {
158         context->lo &= (((u64)-1) << 4) | 3;
159         context->lo |= (value & 3) << 2;
160 }
161
162 static inline void context_set_address_root(struct context_entry *context,
163                                             unsigned long value)
164 {
165         context->lo |= value & VTD_PAGE_MASK;
166 }
167
168 static inline void context_set_address_width(struct context_entry *context,
169                                              unsigned long value)
170 {
171         context->hi |= value & 7;
172 }
173
174 static inline void context_set_domain_id(struct context_entry *context,
175                                          unsigned long value)
176 {
177         context->hi |= (value & ((1 << 16) - 1)) << 8;
178 }
179
180 static inline void context_clear_entry(struct context_entry *context)
181 {
182         context->lo = 0;
183         context->hi = 0;
184 }
185
186 /*
187  * 0: readable
188  * 1: writable
189  * 2-6: reserved
190  * 7: super page
191  * 8-10: available
192  * 11: snoop behavior
193  * 12-63: Host physcial address
194  */
195 struct dma_pte {
196         u64 val;
197 };
198
199 static inline void dma_clear_pte(struct dma_pte *pte)
200 {
201         pte->val = 0;
202 }
203
204 static inline void dma_set_pte_readable(struct dma_pte *pte)
205 {
206         pte->val |= DMA_PTE_READ;
207 }
208
209 static inline void dma_set_pte_writable(struct dma_pte *pte)
210 {
211         pte->val |= DMA_PTE_WRITE;
212 }
213
214 static inline void dma_set_pte_snp(struct dma_pte *pte)
215 {
216         pte->val |= DMA_PTE_SNP;
217 }
218
219 static inline void dma_set_pte_prot(struct dma_pte *pte, unsigned long prot)
220 {
221         pte->val = (pte->val & ~3) | (prot & 3);
222 }
223
224 static inline u64 dma_pte_addr(struct dma_pte *pte)
225 {
226 #ifdef CONFIG_64BIT
227         return pte->val & VTD_PAGE_MASK;
228 #else
229         /* Must have a full atomic 64-bit read */
230         return  __cmpxchg64(pte, 0ULL, 0ULL) & VTD_PAGE_MASK;
231 #endif
232 }
233
234 static inline void dma_set_pte_pfn(struct dma_pte *pte, unsigned long pfn)
235 {
236         pte->val |= (uint64_t)pfn << VTD_PAGE_SHIFT;
237 }
238
239 static inline bool dma_pte_present(struct dma_pte *pte)
240 {
241         return (pte->val & 3) != 0;
242 }
243
244 static inline int first_pte_in_page(struct dma_pte *pte)
245 {
246         return !((unsigned long)pte & ~VTD_PAGE_MASK);
247 }
248
249 /*
250  * This domain is a statically identity mapping domain.
251  *      1. This domain creats a static 1:1 mapping to all usable memory.
252  *      2. It maps to each iommu if successful.
253  *      3. Each iommu mapps to this domain if successful.
254  */
255 static struct dmar_domain *si_domain;
256 static int hw_pass_through = 1;
257
258 /* devices under the same p2p bridge are owned in one domain */
259 #define DOMAIN_FLAG_P2P_MULTIPLE_DEVICES (1 << 0)
260
261 /* domain represents a virtual machine, more than one devices
262  * across iommus may be owned in one domain, e.g. kvm guest.
263  */
264 #define DOMAIN_FLAG_VIRTUAL_MACHINE     (1 << 1)
265
266 /* si_domain contains mulitple devices */
267 #define DOMAIN_FLAG_STATIC_IDENTITY     (1 << 2)
268
269 struct dmar_domain {
270         int     id;                     /* domain id */
271         unsigned long iommu_bmp;        /* bitmap of iommus this domain uses*/
272
273         struct list_head devices;       /* all devices' list */
274         struct iova_domain iovad;       /* iova's that belong to this domain */
275
276         struct dma_pte  *pgd;           /* virtual address */
277         int             gaw;            /* max guest address width */
278
279         /* adjusted guest address width, 0 is level 2 30-bit */
280         int             agaw;
281
282         int             flags;          /* flags to find out type of domain */
283
284         int             iommu_coherency;/* indicate coherency of iommu access */
285         int             iommu_snooping; /* indicate snooping control feature*/
286         int             iommu_count;    /* reference count of iommu */
287         spinlock_t      iommu_lock;     /* protect iommu set in domain */
288         u64             max_addr;       /* maximum mapped address */
289 };
290
291 /* PCI domain-device relationship */
292 struct device_domain_info {
293         struct list_head link;  /* link to domain siblings */
294         struct list_head global; /* link to global list */
295         int segment;            /* PCI domain */
296         u8 bus;                 /* PCI bus number */
297         u8 devfn;               /* PCI devfn number */
298         struct pci_dev *dev; /* it's NULL for PCIE-to-PCI bridge */
299         struct intel_iommu *iommu; /* IOMMU used by this device */
300         struct dmar_domain *domain; /* pointer to domain */
301 };
302
303 static void flush_unmaps_timeout(unsigned long data);
304
305 DEFINE_TIMER(unmap_timer,  flush_unmaps_timeout, 0, 0);
306
307 #define HIGH_WATER_MARK 250
308 struct deferred_flush_tables {
309         int next;
310         struct iova *iova[HIGH_WATER_MARK];
311         struct dmar_domain *domain[HIGH_WATER_MARK];
312 };
313
314 static struct deferred_flush_tables *deferred_flush;
315
316 /* bitmap for indexing intel_iommus */
317 static int g_num_of_iommus;
318
319 static DEFINE_SPINLOCK(async_umap_flush_lock);
320 static LIST_HEAD(unmaps_to_do);
321
322 static int timer_on;
323 static long list_size;
324
325 static void domain_remove_dev_info(struct dmar_domain *domain);
326
327 #ifdef CONFIG_DMAR_DEFAULT_ON
328 int dmar_disabled = 0;
329 #else
330 int dmar_disabled = 1;
331 #endif /*CONFIG_DMAR_DEFAULT_ON*/
332
333 static int __initdata dmar_map_gfx = 1;
334 static int dmar_forcedac;
335 static int intel_iommu_strict;
336
337 #define DUMMY_DEVICE_DOMAIN_INFO ((struct device_domain_info *)(-1))
338 static DEFINE_SPINLOCK(device_domain_lock);
339 static LIST_HEAD(device_domain_list);
340
341 static struct iommu_ops intel_iommu_ops;
342
343 static int __init intel_iommu_setup(char *str)
344 {
345         if (!str)
346                 return -EINVAL;
347         while (*str) {
348                 if (!strncmp(str, "on", 2)) {
349                         dmar_disabled = 0;
350                         printk(KERN_INFO "Intel-IOMMU: enabled\n");
351                 } else if (!strncmp(str, "off", 3)) {
352                         dmar_disabled = 1;
353                         printk(KERN_INFO "Intel-IOMMU: disabled\n");
354                 } else if (!strncmp(str, "igfx_off", 8)) {
355                         dmar_map_gfx = 0;
356                         printk(KERN_INFO
357                                 "Intel-IOMMU: disable GFX device mapping\n");
358                 } else if (!strncmp(str, "forcedac", 8)) {
359                         printk(KERN_INFO
360                                 "Intel-IOMMU: Forcing DAC for PCI devices\n");
361                         dmar_forcedac = 1;
362                 } else if (!strncmp(str, "strict", 6)) {
363                         printk(KERN_INFO
364                                 "Intel-IOMMU: disable batched IOTLB flush\n");
365                         intel_iommu_strict = 1;
366                 }
367
368                 str += strcspn(str, ",");
369                 while (*str == ',')
370                         str++;
371         }
372         return 0;
373 }
374 __setup("intel_iommu=", intel_iommu_setup);
375
376 static struct kmem_cache *iommu_domain_cache;
377 static struct kmem_cache *iommu_devinfo_cache;
378 static struct kmem_cache *iommu_iova_cache;
379
380 static inline void *iommu_kmem_cache_alloc(struct kmem_cache *cachep)
381 {
382         unsigned int flags;
383         void *vaddr;
384
385         /* trying to avoid low memory issues */
386         flags = current->flags & PF_MEMALLOC;
387         current->flags |= PF_MEMALLOC;
388         vaddr = kmem_cache_alloc(cachep, GFP_ATOMIC);
389         current->flags &= (~PF_MEMALLOC | flags);
390         return vaddr;
391 }
392
393
394 static inline void *alloc_pgtable_page(void)
395 {
396         unsigned int flags;
397         void *vaddr;
398
399         /* trying to avoid low memory issues */
400         flags = current->flags & PF_MEMALLOC;
401         current->flags |= PF_MEMALLOC;
402         vaddr = (void *)get_zeroed_page(GFP_ATOMIC);
403         current->flags &= (~PF_MEMALLOC | flags);
404         return vaddr;
405 }
406
407 static inline void free_pgtable_page(void *vaddr)
408 {
409         free_page((unsigned long)vaddr);
410 }
411
412 static inline void *alloc_domain_mem(void)
413 {
414         return iommu_kmem_cache_alloc(iommu_domain_cache);
415 }
416
417 static void free_domain_mem(void *vaddr)
418 {
419         kmem_cache_free(iommu_domain_cache, vaddr);
420 }
421
422 static inline void * alloc_devinfo_mem(void)
423 {
424         return iommu_kmem_cache_alloc(iommu_devinfo_cache);
425 }
426
427 static inline void free_devinfo_mem(void *vaddr)
428 {
429         kmem_cache_free(iommu_devinfo_cache, vaddr);
430 }
431
432 struct iova *alloc_iova_mem(void)
433 {
434         return iommu_kmem_cache_alloc(iommu_iova_cache);
435 }
436
437 void free_iova_mem(struct iova *iova)
438 {
439         kmem_cache_free(iommu_iova_cache, iova);
440 }
441
442
443 static inline int width_to_agaw(int width);
444
445 static int __iommu_calculate_agaw(struct intel_iommu *iommu, int max_gaw)
446 {
447         unsigned long sagaw;
448         int agaw = -1;
449
450         sagaw = cap_sagaw(iommu->cap);
451         for (agaw = width_to_agaw(max_gaw);
452              agaw >= 0; agaw--) {
453                 if (test_bit(agaw, &sagaw))
454                         break;
455         }
456
457         return agaw;
458 }
459
460 /*
461  * Calculate max SAGAW for each iommu.
462  */
463 int iommu_calculate_max_sagaw(struct intel_iommu *iommu)
464 {
465         return __iommu_calculate_agaw(iommu, MAX_AGAW_WIDTH);
466 }
467
468 /*
469  * calculate agaw for each iommu.
470  * "SAGAW" may be different across iommus, use a default agaw, and
471  * get a supported less agaw for iommus that don't support the default agaw.
472  */
473 int iommu_calculate_agaw(struct intel_iommu *iommu)
474 {
475         return __iommu_calculate_agaw(iommu, DEFAULT_DOMAIN_ADDRESS_WIDTH);
476 }
477
478 /* This functionin only returns single iommu in a domain */
479 static struct intel_iommu *domain_get_iommu(struct dmar_domain *domain)
480 {
481         int iommu_id;
482
483         /* si_domain and vm domain should not get here. */
484         BUG_ON(domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE);
485         BUG_ON(domain->flags & DOMAIN_FLAG_STATIC_IDENTITY);
486
487         iommu_id = find_first_bit(&domain->iommu_bmp, g_num_of_iommus);
488         if (iommu_id < 0 || iommu_id >= g_num_of_iommus)
489                 return NULL;
490
491         return g_iommus[iommu_id];
492 }
493
494 static void domain_update_iommu_coherency(struct dmar_domain *domain)
495 {
496         int i;
497
498         domain->iommu_coherency = 1;
499
500         i = find_first_bit(&domain->iommu_bmp, g_num_of_iommus);
501         for (; i < g_num_of_iommus; ) {
502                 if (!ecap_coherent(g_iommus[i]->ecap)) {
503                         domain->iommu_coherency = 0;
504                         break;
505                 }
506                 i = find_next_bit(&domain->iommu_bmp, g_num_of_iommus, i+1);
507         }
508 }
509
510 static void domain_update_iommu_snooping(struct dmar_domain *domain)
511 {
512         int i;
513
514         domain->iommu_snooping = 1;
515
516         i = find_first_bit(&domain->iommu_bmp, g_num_of_iommus);
517         for (; i < g_num_of_iommus; ) {
518                 if (!ecap_sc_support(g_iommus[i]->ecap)) {
519                         domain->iommu_snooping = 0;
520                         break;
521                 }
522                 i = find_next_bit(&domain->iommu_bmp, g_num_of_iommus, i+1);
523         }
524 }
525
526 /* Some capabilities may be different across iommus */
527 static void domain_update_iommu_cap(struct dmar_domain *domain)
528 {
529         domain_update_iommu_coherency(domain);
530         domain_update_iommu_snooping(domain);
531 }
532
533 static struct intel_iommu *device_to_iommu(int segment, u8 bus, u8 devfn)
534 {
535         struct dmar_drhd_unit *drhd = NULL;
536         int i;
537
538         for_each_drhd_unit(drhd) {
539                 if (drhd->ignored)
540                         continue;
541                 if (segment != drhd->segment)
542                         continue;
543
544                 for (i = 0; i < drhd->devices_cnt; i++) {
545                         if (drhd->devices[i] &&
546                             drhd->devices[i]->bus->number == bus &&
547                             drhd->devices[i]->devfn == devfn)
548                                 return drhd->iommu;
549                         if (drhd->devices[i] &&
550                             drhd->devices[i]->subordinate &&
551                             drhd->devices[i]->subordinate->number <= bus &&
552                             drhd->devices[i]->subordinate->subordinate >= bus)
553                                 return drhd->iommu;
554                 }
555
556                 if (drhd->include_all)
557                         return drhd->iommu;
558         }
559
560         return NULL;
561 }
562
563 static void domain_flush_cache(struct dmar_domain *domain,
564                                void *addr, int size)
565 {
566         if (!domain->iommu_coherency)
567                 clflush_cache_range(addr, size);
568 }
569
570 /* Gets context entry for a given bus and devfn */
571 static struct context_entry * device_to_context_entry(struct intel_iommu *iommu,
572                 u8 bus, u8 devfn)
573 {
574         struct root_entry *root;
575         struct context_entry *context;
576         unsigned long phy_addr;
577         unsigned long flags;
578
579         spin_lock_irqsave(&iommu->lock, flags);
580         root = &iommu->root_entry[bus];
581         context = get_context_addr_from_root(root);
582         if (!context) {
583                 context = (struct context_entry *)alloc_pgtable_page();
584                 if (!context) {
585                         spin_unlock_irqrestore(&iommu->lock, flags);
586                         return NULL;
587                 }
588                 __iommu_flush_cache(iommu, (void *)context, CONTEXT_SIZE);
589                 phy_addr = virt_to_phys((void *)context);
590                 set_root_value(root, phy_addr);
591                 set_root_present(root);
592                 __iommu_flush_cache(iommu, root, sizeof(*root));
593         }
594         spin_unlock_irqrestore(&iommu->lock, flags);
595         return &context[devfn];
596 }
597
598 static int device_context_mapped(struct intel_iommu *iommu, u8 bus, u8 devfn)
599 {
600         struct root_entry *root;
601         struct context_entry *context;
602         int ret;
603         unsigned long flags;
604
605         spin_lock_irqsave(&iommu->lock, flags);
606         root = &iommu->root_entry[bus];
607         context = get_context_addr_from_root(root);
608         if (!context) {
609                 ret = 0;
610                 goto out;
611         }
612         ret = context_present(&context[devfn]);
613 out:
614         spin_unlock_irqrestore(&iommu->lock, flags);
615         return ret;
616 }
617
618 static void clear_context_table(struct intel_iommu *iommu, u8 bus, u8 devfn)
619 {
620         struct root_entry *root;
621         struct context_entry *context;
622         unsigned long flags;
623
624         spin_lock_irqsave(&iommu->lock, flags);
625         root = &iommu->root_entry[bus];
626         context = get_context_addr_from_root(root);
627         if (context) {
628                 context_clear_entry(&context[devfn]);
629                 __iommu_flush_cache(iommu, &context[devfn], \
630                         sizeof(*context));
631         }
632         spin_unlock_irqrestore(&iommu->lock, flags);
633 }
634
635 static void free_context_table(struct intel_iommu *iommu)
636 {
637         struct root_entry *root;
638         int i;
639         unsigned long flags;
640         struct context_entry *context;
641
642         spin_lock_irqsave(&iommu->lock, flags);
643         if (!iommu->root_entry) {
644                 goto out;
645         }
646         for (i = 0; i < ROOT_ENTRY_NR; i++) {
647                 root = &iommu->root_entry[i];
648                 context = get_context_addr_from_root(root);
649                 if (context)
650                         free_pgtable_page(context);
651         }
652         free_pgtable_page(iommu->root_entry);
653         iommu->root_entry = NULL;
654 out:
655         spin_unlock_irqrestore(&iommu->lock, flags);
656 }
657
658 /* page table handling */
659 #define LEVEL_STRIDE            (9)
660 #define LEVEL_MASK              (((u64)1 << LEVEL_STRIDE) - 1)
661
662 static inline int agaw_to_level(int agaw)
663 {
664         return agaw + 2;
665 }
666
667 static inline int agaw_to_width(int agaw)
668 {
669         return 30 + agaw * LEVEL_STRIDE;
670
671 }
672
673 static inline int width_to_agaw(int width)
674 {
675         return (width - 30) / LEVEL_STRIDE;
676 }
677
678 static inline unsigned int level_to_offset_bits(int level)
679 {
680         return (level - 1) * LEVEL_STRIDE;
681 }
682
683 static inline int pfn_level_offset(unsigned long pfn, int level)
684 {
685         return (pfn >> level_to_offset_bits(level)) & LEVEL_MASK;
686 }
687
688 static inline unsigned long level_mask(int level)
689 {
690         return -1UL << level_to_offset_bits(level);
691 }
692
693 static inline unsigned long level_size(int level)
694 {
695         return 1UL << level_to_offset_bits(level);
696 }
697
698 static inline unsigned long align_to_level(unsigned long pfn, int level)
699 {
700         return (pfn + level_size(level) - 1) & level_mask(level);
701 }
702
703 static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain,
704                                       unsigned long pfn)
705 {
706         int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT;
707         struct dma_pte *parent, *pte = NULL;
708         int level = agaw_to_level(domain->agaw);
709         int offset;
710
711         BUG_ON(!domain->pgd);
712         BUG_ON(addr_width < BITS_PER_LONG && pfn >> addr_width);
713         parent = domain->pgd;
714
715         while (level > 0) {
716                 void *tmp_page;
717
718                 offset = pfn_level_offset(pfn, level);
719                 pte = &parent[offset];
720                 if (level == 1)
721                         break;
722
723                 if (!dma_pte_present(pte)) {
724                         uint64_t pteval;
725
726                         tmp_page = alloc_pgtable_page();
727
728                         if (!tmp_page)
729                                 return NULL;
730
731                         domain_flush_cache(domain, tmp_page, VTD_PAGE_SIZE);
732                         pteval = (virt_to_dma_pfn(tmp_page) << VTD_PAGE_SHIFT) | DMA_PTE_READ | DMA_PTE_WRITE;
733                         if (cmpxchg64(&pte->val, 0ULL, pteval)) {
734                                 /* Someone else set it while we were thinking; use theirs. */
735                                 free_pgtable_page(tmp_page);
736                         } else {
737                                 dma_pte_addr(pte);
738                                 domain_flush_cache(domain, pte, sizeof(*pte));
739                         }
740                 }
741                 parent = phys_to_virt(dma_pte_addr(pte));
742                 level--;
743         }
744
745         return pte;
746 }
747
748 /* return address's pte at specific level */
749 static struct dma_pte *dma_pfn_level_pte(struct dmar_domain *domain,
750                                          unsigned long pfn,
751                                          int level)
752 {
753         struct dma_pte *parent, *pte = NULL;
754         int total = agaw_to_level(domain->agaw);
755         int offset;
756
757         parent = domain->pgd;
758         while (level <= total) {
759                 offset = pfn_level_offset(pfn, total);
760                 pte = &parent[offset];
761                 if (level == total)
762                         return pte;
763
764                 if (!dma_pte_present(pte))
765                         break;
766                 parent = phys_to_virt(dma_pte_addr(pte));
767                 total--;
768         }
769         return NULL;
770 }
771
772 /* clear last level pte, a tlb flush should be followed */
773 static void dma_pte_clear_range(struct dmar_domain *domain,
774                                 unsigned long start_pfn,
775                                 unsigned long last_pfn)
776 {
777         int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT;
778         struct dma_pte *first_pte, *pte;
779
780         BUG_ON(addr_width < BITS_PER_LONG && start_pfn >> addr_width);
781         BUG_ON(addr_width < BITS_PER_LONG && last_pfn >> addr_width);
782
783         /* we don't need lock here; nobody else touches the iova range */
784         while (start_pfn <= last_pfn) {
785                 first_pte = pte = dma_pfn_level_pte(domain, start_pfn, 1);
786                 if (!pte) {
787                         start_pfn = align_to_level(start_pfn + 1, 2);
788                         continue;
789                 }
790                 do { 
791                         dma_clear_pte(pte);
792                         start_pfn++;
793                         pte++;
794                 } while (start_pfn <= last_pfn && !first_pte_in_page(pte));
795
796                 domain_flush_cache(domain, first_pte,
797                                    (void *)pte - (void *)first_pte);
798         }
799 }
800
801 /* free page table pages. last level pte should already be cleared */
802 static void dma_pte_free_pagetable(struct dmar_domain *domain,
803                                    unsigned long start_pfn,
804                                    unsigned long last_pfn)
805 {
806         int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT;
807         struct dma_pte *first_pte, *pte;
808         int total = agaw_to_level(domain->agaw);
809         int level;
810         unsigned long tmp;
811
812         BUG_ON(addr_width < BITS_PER_LONG && start_pfn >> addr_width);
813         BUG_ON(addr_width < BITS_PER_LONG && last_pfn >> addr_width);
814
815         /* We don't need lock here; nobody else touches the iova range */
816         level = 2;
817         while (level <= total) {
818                 tmp = align_to_level(start_pfn, level);
819
820                 /* If we can't even clear one PTE at this level, we're done */
821                 if (tmp + level_size(level) - 1 > last_pfn)
822                         return;
823
824                 while (tmp + level_size(level) - 1 <= last_pfn) {
825                         first_pte = pte = dma_pfn_level_pte(domain, tmp, level);
826                         if (!pte) {
827                                 tmp = align_to_level(tmp + 1, level + 1);
828                                 continue;
829                         }
830                         do {
831                                 if (dma_pte_present(pte)) {
832                                         free_pgtable_page(phys_to_virt(dma_pte_addr(pte)));
833                                         dma_clear_pte(pte);
834                                 }
835                                 pte++;
836                                 tmp += level_size(level);
837                         } while (!first_pte_in_page(pte) &&
838                                  tmp + level_size(level) - 1 <= last_pfn);
839
840                         domain_flush_cache(domain, first_pte,
841                                            (void *)pte - (void *)first_pte);
842                         
843                 }
844                 level++;
845         }
846         /* free pgd */
847         if (start_pfn == 0 && last_pfn == DOMAIN_MAX_PFN(domain->gaw)) {
848                 free_pgtable_page(domain->pgd);
849                 domain->pgd = NULL;
850         }
851 }
852
853 /* iommu handling */
854 static int iommu_alloc_root_entry(struct intel_iommu *iommu)
855 {
856         struct root_entry *root;
857         unsigned long flags;
858
859         root = (struct root_entry *)alloc_pgtable_page();
860         if (!root)
861                 return -ENOMEM;
862
863         __iommu_flush_cache(iommu, root, ROOT_SIZE);
864
865         spin_lock_irqsave(&iommu->lock, flags);
866         iommu->root_entry = root;
867         spin_unlock_irqrestore(&iommu->lock, flags);
868
869         return 0;
870 }
871
872 static void iommu_set_root_entry(struct intel_iommu *iommu)
873 {
874         void *addr;
875         u32 sts;
876         unsigned long flag;
877
878         addr = iommu->root_entry;
879
880         spin_lock_irqsave(&iommu->register_lock, flag);
881         dmar_writeq(iommu->reg + DMAR_RTADDR_REG, virt_to_phys(addr));
882
883         writel(iommu->gcmd | DMA_GCMD_SRTP, iommu->reg + DMAR_GCMD_REG);
884
885         /* Make sure hardware complete it */
886         IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
887                       readl, (sts & DMA_GSTS_RTPS), sts);
888
889         spin_unlock_irqrestore(&iommu->register_lock, flag);
890 }
891
892 static void iommu_flush_write_buffer(struct intel_iommu *iommu)
893 {
894         u32 val;
895         unsigned long flag;
896
897         if (!rwbf_quirk && !cap_rwbf(iommu->cap))
898                 return;
899
900         spin_lock_irqsave(&iommu->register_lock, flag);
901         writel(iommu->gcmd | DMA_GCMD_WBF, iommu->reg + DMAR_GCMD_REG);
902
903         /* Make sure hardware complete it */
904         IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
905                       readl, (!(val & DMA_GSTS_WBFS)), val);
906
907         spin_unlock_irqrestore(&iommu->register_lock, flag);
908 }
909
910 /* return value determine if we need a write buffer flush */
911 static void __iommu_flush_context(struct intel_iommu *iommu,
912                                   u16 did, u16 source_id, u8 function_mask,
913                                   u64 type)
914 {
915         u64 val = 0;
916         unsigned long flag;
917
918         switch (type) {
919         case DMA_CCMD_GLOBAL_INVL:
920                 val = DMA_CCMD_GLOBAL_INVL;
921                 break;
922         case DMA_CCMD_DOMAIN_INVL:
923                 val = DMA_CCMD_DOMAIN_INVL|DMA_CCMD_DID(did);
924                 break;
925         case DMA_CCMD_DEVICE_INVL:
926                 val = DMA_CCMD_DEVICE_INVL|DMA_CCMD_DID(did)
927                         | DMA_CCMD_SID(source_id) | DMA_CCMD_FM(function_mask);
928                 break;
929         default:
930                 BUG();
931         }
932         val |= DMA_CCMD_ICC;
933
934         spin_lock_irqsave(&iommu->register_lock, flag);
935         dmar_writeq(iommu->reg + DMAR_CCMD_REG, val);
936
937         /* Make sure hardware complete it */
938         IOMMU_WAIT_OP(iommu, DMAR_CCMD_REG,
939                 dmar_readq, (!(val & DMA_CCMD_ICC)), val);
940
941         spin_unlock_irqrestore(&iommu->register_lock, flag);
942 }
943
944 /* return value determine if we need a write buffer flush */
945 static void __iommu_flush_iotlb(struct intel_iommu *iommu, u16 did,
946                                 u64 addr, unsigned int size_order, u64 type)
947 {
948         int tlb_offset = ecap_iotlb_offset(iommu->ecap);
949         u64 val = 0, val_iva = 0;
950         unsigned long flag;
951
952         switch (type) {
953         case DMA_TLB_GLOBAL_FLUSH:
954                 /* global flush doesn't need set IVA_REG */
955                 val = DMA_TLB_GLOBAL_FLUSH|DMA_TLB_IVT;
956                 break;
957         case DMA_TLB_DSI_FLUSH:
958                 val = DMA_TLB_DSI_FLUSH|DMA_TLB_IVT|DMA_TLB_DID(did);
959                 break;
960         case DMA_TLB_PSI_FLUSH:
961                 val = DMA_TLB_PSI_FLUSH|DMA_TLB_IVT|DMA_TLB_DID(did);
962                 /* Note: always flush non-leaf currently */
963                 val_iva = size_order | addr;
964                 break;
965         default:
966                 BUG();
967         }
968         /* Note: set drain read/write */
969 #if 0
970         /*
971          * This is probably to be super secure.. Looks like we can
972          * ignore it without any impact.
973          */
974         if (cap_read_drain(iommu->cap))
975                 val |= DMA_TLB_READ_DRAIN;
976 #endif
977         if (cap_write_drain(iommu->cap))
978                 val |= DMA_TLB_WRITE_DRAIN;
979
980         spin_lock_irqsave(&iommu->register_lock, flag);
981         /* Note: Only uses first TLB reg currently */
982         if (val_iva)
983                 dmar_writeq(iommu->reg + tlb_offset, val_iva);
984         dmar_writeq(iommu->reg + tlb_offset + 8, val);
985
986         /* Make sure hardware complete it */
987         IOMMU_WAIT_OP(iommu, tlb_offset + 8,
988                 dmar_readq, (!(val & DMA_TLB_IVT)), val);
989
990         spin_unlock_irqrestore(&iommu->register_lock, flag);
991
992         /* check IOTLB invalidation granularity */
993         if (DMA_TLB_IAIG(val) == 0)
994                 printk(KERN_ERR"IOMMU: flush IOTLB failed\n");
995         if (DMA_TLB_IAIG(val) != DMA_TLB_IIRG(type))
996                 pr_debug("IOMMU: tlb flush request %Lx, actual %Lx\n",
997                         (unsigned long long)DMA_TLB_IIRG(type),
998                         (unsigned long long)DMA_TLB_IAIG(val));
999 }
1000
1001 static struct device_domain_info *iommu_support_dev_iotlb(
1002         struct dmar_domain *domain, int segment, u8 bus, u8 devfn)
1003 {
1004         int found = 0;
1005         unsigned long flags;
1006         struct device_domain_info *info;
1007         struct intel_iommu *iommu = device_to_iommu(segment, bus, devfn);
1008
1009         if (!ecap_dev_iotlb_support(iommu->ecap))
1010                 return NULL;
1011
1012         if (!iommu->qi)
1013                 return NULL;
1014
1015         spin_lock_irqsave(&device_domain_lock, flags);
1016         list_for_each_entry(info, &domain->devices, link)
1017                 if (info->bus == bus && info->devfn == devfn) {
1018                         found = 1;
1019                         break;
1020                 }
1021         spin_unlock_irqrestore(&device_domain_lock, flags);
1022
1023         if (!found || !info->dev)
1024                 return NULL;
1025
1026         if (!pci_find_ext_capability(info->dev, PCI_EXT_CAP_ID_ATS))
1027                 return NULL;
1028
1029         if (!dmar_find_matched_atsr_unit(info->dev))
1030                 return NULL;
1031
1032         info->iommu = iommu;
1033
1034         return info;
1035 }
1036
1037 static void iommu_enable_dev_iotlb(struct device_domain_info *info)
1038 {
1039         if (!info)
1040                 return;
1041
1042         pci_enable_ats(info->dev, VTD_PAGE_SHIFT);
1043 }
1044
1045 static void iommu_disable_dev_iotlb(struct device_domain_info *info)
1046 {
1047         if (!info->dev || !pci_ats_enabled(info->dev))
1048                 return;
1049
1050         pci_disable_ats(info->dev);
1051 }
1052
1053 static void iommu_flush_dev_iotlb(struct dmar_domain *domain,
1054                                   u64 addr, unsigned mask)
1055 {
1056         u16 sid, qdep;
1057         unsigned long flags;
1058         struct device_domain_info *info;
1059
1060         spin_lock_irqsave(&device_domain_lock, flags);
1061         list_for_each_entry(info, &domain->devices, link) {
1062                 if (!info->dev || !pci_ats_enabled(info->dev))
1063                         continue;
1064
1065                 sid = info->bus << 8 | info->devfn;
1066                 qdep = pci_ats_queue_depth(info->dev);
1067                 qi_flush_dev_iotlb(info->iommu, sid, qdep, addr, mask);
1068         }
1069         spin_unlock_irqrestore(&device_domain_lock, flags);
1070 }
1071
1072 static void iommu_flush_iotlb_psi(struct intel_iommu *iommu, u16 did,
1073                                   unsigned long pfn, unsigned int pages)
1074 {
1075         unsigned int mask = ilog2(__roundup_pow_of_two(pages));
1076         uint64_t addr = (uint64_t)pfn << VTD_PAGE_SHIFT;
1077
1078         BUG_ON(pages == 0);
1079
1080         /*
1081          * Fallback to domain selective flush if no PSI support or the size is
1082          * too big.
1083          * PSI requires page size to be 2 ^ x, and the base address is naturally
1084          * aligned to the size
1085          */
1086         if (!cap_pgsel_inv(iommu->cap) || mask > cap_max_amask_val(iommu->cap))
1087                 iommu->flush.flush_iotlb(iommu, did, 0, 0,
1088                                                 DMA_TLB_DSI_FLUSH);
1089         else
1090                 iommu->flush.flush_iotlb(iommu, did, addr, mask,
1091                                                 DMA_TLB_PSI_FLUSH);
1092
1093         /*
1094          * In caching mode, domain ID 0 is reserved for non-present to present
1095          * mapping flush. Device IOTLB doesn't need to be flushed in this case.
1096          */
1097         if (!cap_caching_mode(iommu->cap) || did)
1098                 iommu_flush_dev_iotlb(iommu->domains[did], addr, mask);
1099 }
1100
1101 static void iommu_disable_protect_mem_regions(struct intel_iommu *iommu)
1102 {
1103         u32 pmen;
1104         unsigned long flags;
1105
1106         spin_lock_irqsave(&iommu->register_lock, flags);
1107         pmen = readl(iommu->reg + DMAR_PMEN_REG);
1108         pmen &= ~DMA_PMEN_EPM;
1109         writel(pmen, iommu->reg + DMAR_PMEN_REG);
1110
1111         /* wait for the protected region status bit to clear */
1112         IOMMU_WAIT_OP(iommu, DMAR_PMEN_REG,
1113                 readl, !(pmen & DMA_PMEN_PRS), pmen);
1114
1115         spin_unlock_irqrestore(&iommu->register_lock, flags);
1116 }
1117
1118 static int iommu_enable_translation(struct intel_iommu *iommu)
1119 {
1120         u32 sts;
1121         unsigned long flags;
1122
1123         spin_lock_irqsave(&iommu->register_lock, flags);
1124         iommu->gcmd |= DMA_GCMD_TE;
1125         writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
1126
1127         /* Make sure hardware complete it */
1128         IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
1129                       readl, (sts & DMA_GSTS_TES), sts);
1130
1131         spin_unlock_irqrestore(&iommu->register_lock, flags);
1132         return 0;
1133 }
1134
1135 static int iommu_disable_translation(struct intel_iommu *iommu)
1136 {
1137         u32 sts;
1138         unsigned long flag;
1139
1140         spin_lock_irqsave(&iommu->register_lock, flag);
1141         iommu->gcmd &= ~DMA_GCMD_TE;
1142         writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
1143
1144         /* Make sure hardware complete it */
1145         IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
1146                       readl, (!(sts & DMA_GSTS_TES)), sts);
1147
1148         spin_unlock_irqrestore(&iommu->register_lock, flag);
1149         return 0;
1150 }
1151
1152
1153 static int iommu_init_domains(struct intel_iommu *iommu)
1154 {
1155         unsigned long ndomains;
1156         unsigned long nlongs;
1157
1158         ndomains = cap_ndoms(iommu->cap);
1159         pr_debug("Number of Domains supportd <%ld>\n", ndomains);
1160         nlongs = BITS_TO_LONGS(ndomains);
1161
1162         spin_lock_init(&iommu->lock);
1163
1164         /* TBD: there might be 64K domains,
1165          * consider other allocation for future chip
1166          */
1167         iommu->domain_ids = kcalloc(nlongs, sizeof(unsigned long), GFP_KERNEL);
1168         if (!iommu->domain_ids) {
1169                 printk(KERN_ERR "Allocating domain id array failed\n");
1170                 return -ENOMEM;
1171         }
1172         iommu->domains = kcalloc(ndomains, sizeof(struct dmar_domain *),
1173                         GFP_KERNEL);
1174         if (!iommu->domains) {
1175                 printk(KERN_ERR "Allocating domain array failed\n");
1176                 return -ENOMEM;
1177         }
1178
1179         /*
1180          * if Caching mode is set, then invalid translations are tagged
1181          * with domainid 0. Hence we need to pre-allocate it.
1182          */
1183         if (cap_caching_mode(iommu->cap))
1184                 set_bit(0, iommu->domain_ids);
1185         return 0;
1186 }
1187
1188
1189 static void domain_exit(struct dmar_domain *domain);
1190 static void vm_domain_exit(struct dmar_domain *domain);
1191
1192 void free_dmar_iommu(struct intel_iommu *iommu)
1193 {
1194         struct dmar_domain *domain;
1195         int i;
1196         unsigned long flags;
1197
1198         if ((iommu->domains) && (iommu->domain_ids)) {
1199                 i = find_first_bit(iommu->domain_ids, cap_ndoms(iommu->cap));
1200                 for (; i < cap_ndoms(iommu->cap); ) {
1201                         domain = iommu->domains[i];
1202                         clear_bit(i, iommu->domain_ids);
1203
1204                         spin_lock_irqsave(&domain->iommu_lock, flags);
1205                         if (--domain->iommu_count == 0) {
1206                                 if (domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE)
1207                                         vm_domain_exit(domain);
1208                                 else
1209                                         domain_exit(domain);
1210                         }
1211                         spin_unlock_irqrestore(&domain->iommu_lock, flags);
1212
1213                         i = find_next_bit(iommu->domain_ids,
1214                                 cap_ndoms(iommu->cap), i+1);
1215                 }
1216         }
1217
1218         if (iommu->gcmd & DMA_GCMD_TE)
1219                 iommu_disable_translation(iommu);
1220
1221         if (iommu->irq) {
1222                 set_irq_data(iommu->irq, NULL);
1223                 /* This will mask the irq */
1224                 free_irq(iommu->irq, iommu);
1225                 destroy_irq(iommu->irq);
1226         }
1227
1228         kfree(iommu->domains);
1229         kfree(iommu->domain_ids);
1230
1231         g_iommus[iommu->seq_id] = NULL;
1232
1233         /* if all iommus are freed, free g_iommus */
1234         for (i = 0; i < g_num_of_iommus; i++) {
1235                 if (g_iommus[i])
1236                         break;
1237         }
1238
1239         if (i == g_num_of_iommus)
1240                 kfree(g_iommus);
1241
1242         /* free context mapping */
1243         free_context_table(iommu);
1244 }
1245
1246 static struct dmar_domain *alloc_domain(void)
1247 {
1248         struct dmar_domain *domain;
1249
1250         domain = alloc_domain_mem();
1251         if (!domain)
1252                 return NULL;
1253
1254         memset(&domain->iommu_bmp, 0, sizeof(unsigned long));
1255         domain->flags = 0;
1256
1257         return domain;
1258 }
1259
1260 static int iommu_attach_domain(struct dmar_domain *domain,
1261                                struct intel_iommu *iommu)
1262 {
1263         int num;
1264         unsigned long ndomains;
1265         unsigned long flags;
1266
1267         ndomains = cap_ndoms(iommu->cap);
1268
1269         spin_lock_irqsave(&iommu->lock, flags);
1270
1271         num = find_first_zero_bit(iommu->domain_ids, ndomains);
1272         if (num >= ndomains) {
1273                 spin_unlock_irqrestore(&iommu->lock, flags);
1274                 printk(KERN_ERR "IOMMU: no free domain ids\n");
1275                 return -ENOMEM;
1276         }
1277
1278         domain->id = num;
1279         set_bit(num, iommu->domain_ids);
1280         set_bit(iommu->seq_id, &domain->iommu_bmp);
1281         iommu->domains[num] = domain;
1282         spin_unlock_irqrestore(&iommu->lock, flags);
1283
1284         return 0;
1285 }
1286
1287 static void iommu_detach_domain(struct dmar_domain *domain,
1288                                 struct intel_iommu *iommu)
1289 {
1290         unsigned long flags;
1291         int num, ndomains;
1292         int found = 0;
1293
1294         spin_lock_irqsave(&iommu->lock, flags);
1295         ndomains = cap_ndoms(iommu->cap);
1296         num = find_first_bit(iommu->domain_ids, ndomains);
1297         for (; num < ndomains; ) {
1298                 if (iommu->domains[num] == domain) {
1299                         found = 1;
1300                         break;
1301                 }
1302                 num = find_next_bit(iommu->domain_ids,
1303                                     cap_ndoms(iommu->cap), num+1);
1304         }
1305
1306         if (found) {
1307                 clear_bit(num, iommu->domain_ids);
1308                 clear_bit(iommu->seq_id, &domain->iommu_bmp);
1309                 iommu->domains[num] = NULL;
1310         }
1311         spin_unlock_irqrestore(&iommu->lock, flags);
1312 }
1313
1314 static struct iova_domain reserved_iova_list;
1315 static struct lock_class_key reserved_rbtree_key;
1316
1317 static void dmar_init_reserved_ranges(void)
1318 {
1319         struct pci_dev *pdev = NULL;
1320         struct iova *iova;
1321         int i;
1322
1323         init_iova_domain(&reserved_iova_list, DMA_32BIT_PFN);
1324
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                         iommu->domains[num] = domain;
1509                         id = num;
1510                 }
1511
1512                 /* Skip top levels of page tables for
1513                  * iommu which has less agaw than default.
1514                  */
1515                 for (agaw = domain->agaw; agaw != iommu->agaw; agaw--) {
1516                         pgd = phys_to_virt(dma_pte_addr(pgd));
1517                         if (!dma_pte_present(pgd)) {
1518                                 spin_unlock_irqrestore(&iommu->lock, flags);
1519                                 return -ENOMEM;
1520                         }
1521                 }
1522         }
1523
1524         context_set_domain_id(context, id);
1525
1526         if (translation != CONTEXT_TT_PASS_THROUGH) {
1527                 info = iommu_support_dev_iotlb(domain, segment, bus, devfn);
1528                 translation = info ? CONTEXT_TT_DEV_IOTLB :
1529                                      CONTEXT_TT_MULTI_LEVEL;
1530         }
1531         /*
1532          * In pass through mode, AW must be programmed to indicate the largest
1533          * AGAW value supported by hardware. And ASR is ignored by hardware.
1534          */
1535         if (unlikely(translation == CONTEXT_TT_PASS_THROUGH))
1536                 context_set_address_width(context, iommu->msagaw);
1537         else {
1538                 context_set_address_root(context, virt_to_phys(pgd));
1539                 context_set_address_width(context, iommu->agaw);
1540         }
1541
1542         context_set_translation_type(context, translation);
1543         context_set_fault_enable(context);
1544         context_set_present(context);
1545         domain_flush_cache(domain, context, sizeof(*context));
1546
1547         /*
1548          * It's a non-present to present mapping. If hardware doesn't cache
1549          * non-present entry we only need to flush the write-buffer. If the
1550          * _does_ cache non-present entries, then it does so in the special
1551          * domain #0, which we have to flush:
1552          */
1553         if (cap_caching_mode(iommu->cap)) {
1554                 iommu->flush.flush_context(iommu, 0,
1555                                            (((u16)bus) << 8) | devfn,
1556                                            DMA_CCMD_MASK_NOBIT,
1557                                            DMA_CCMD_DEVICE_INVL);
1558                 iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_DSI_FLUSH);
1559         } else {
1560                 iommu_flush_write_buffer(iommu);
1561         }
1562         iommu_enable_dev_iotlb(info);
1563         spin_unlock_irqrestore(&iommu->lock, flags);
1564
1565         spin_lock_irqsave(&domain->iommu_lock, flags);
1566         if (!test_and_set_bit(iommu->seq_id, &domain->iommu_bmp)) {
1567                 domain->iommu_count++;
1568                 domain_update_iommu_cap(domain);
1569         }
1570         spin_unlock_irqrestore(&domain->iommu_lock, flags);
1571         return 0;
1572 }
1573
1574 static int
1575 domain_context_mapping(struct dmar_domain *domain, struct pci_dev *pdev,
1576                         int translation)
1577 {
1578         int ret;
1579         struct pci_dev *tmp, *parent;
1580
1581         ret = domain_context_mapping_one(domain, pci_domain_nr(pdev->bus),
1582                                          pdev->bus->number, pdev->devfn,
1583                                          translation);
1584         if (ret)
1585                 return ret;
1586
1587         /* dependent device mapping */
1588         tmp = pci_find_upstream_pcie_bridge(pdev);
1589         if (!tmp)
1590                 return 0;
1591         /* Secondary interface's bus number and devfn 0 */
1592         parent = pdev->bus->self;
1593         while (parent != tmp) {
1594                 ret = domain_context_mapping_one(domain,
1595                                                  pci_domain_nr(parent->bus),
1596                                                  parent->bus->number,
1597                                                  parent->devfn, translation);
1598                 if (ret)
1599                         return ret;
1600                 parent = parent->bus->self;
1601         }
1602         if (tmp->is_pcie) /* this is a PCIE-to-PCI bridge */
1603                 return domain_context_mapping_one(domain,
1604                                         pci_domain_nr(tmp->subordinate),
1605                                         tmp->subordinate->number, 0,
1606                                         translation);
1607         else /* this is a legacy PCI bridge */
1608                 return domain_context_mapping_one(domain,
1609                                                   pci_domain_nr(tmp->bus),
1610                                                   tmp->bus->number,
1611                                                   tmp->devfn,
1612                                                   translation);
1613 }
1614
1615 static int domain_context_mapped(struct pci_dev *pdev)
1616 {
1617         int ret;
1618         struct pci_dev *tmp, *parent;
1619         struct intel_iommu *iommu;
1620
1621         iommu = device_to_iommu(pci_domain_nr(pdev->bus), pdev->bus->number,
1622                                 pdev->devfn);
1623         if (!iommu)
1624                 return -ENODEV;
1625
1626         ret = device_context_mapped(iommu, pdev->bus->number, pdev->devfn);
1627         if (!ret)
1628                 return ret;
1629         /* dependent device mapping */
1630         tmp = pci_find_upstream_pcie_bridge(pdev);
1631         if (!tmp)
1632                 return ret;
1633         /* Secondary interface's bus number and devfn 0 */
1634         parent = pdev->bus->self;
1635         while (parent != tmp) {
1636                 ret = device_context_mapped(iommu, parent->bus->number,
1637                                             parent->devfn);
1638                 if (!ret)
1639                         return ret;
1640                 parent = parent->bus->self;
1641         }
1642         if (tmp->is_pcie)
1643                 return device_context_mapped(iommu, tmp->subordinate->number,
1644                                              0);
1645         else
1646                 return device_context_mapped(iommu, tmp->bus->number,
1647                                              tmp->devfn);
1648 }
1649
1650 /* Returns a number of VTD pages, but aligned to MM page size */
1651 static inline unsigned long aligned_nrpages(unsigned long host_addr,
1652                                             size_t size)
1653 {
1654         host_addr &= ~PAGE_MASK;
1655         return PAGE_ALIGN(host_addr + size) >> VTD_PAGE_SHIFT;
1656 }
1657
1658 static int __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
1659                             struct scatterlist *sg, unsigned long phys_pfn,
1660                             unsigned long nr_pages, int prot)
1661 {
1662         struct dma_pte *first_pte = NULL, *pte = NULL;
1663         phys_addr_t uninitialized_var(pteval);
1664         int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT;
1665         unsigned long sg_res;
1666
1667         BUG_ON(addr_width < BITS_PER_LONG && (iov_pfn + nr_pages - 1) >> addr_width);
1668
1669         if ((prot & (DMA_PTE_READ|DMA_PTE_WRITE)) == 0)
1670                 return -EINVAL;
1671
1672         prot &= DMA_PTE_READ | DMA_PTE_WRITE | DMA_PTE_SNP;
1673
1674         if (sg)
1675                 sg_res = 0;
1676         else {
1677                 sg_res = nr_pages + 1;
1678                 pteval = ((phys_addr_t)phys_pfn << VTD_PAGE_SHIFT) | prot;
1679         }
1680
1681         while (nr_pages--) {
1682                 uint64_t tmp;
1683
1684                 if (!sg_res) {
1685                         sg_res = aligned_nrpages(sg->offset, sg->length);
1686                         sg->dma_address = ((dma_addr_t)iov_pfn << VTD_PAGE_SHIFT) + sg->offset;
1687                         sg->dma_length = sg->length;
1688                         pteval = page_to_phys(sg_page(sg)) | prot;
1689                 }
1690                 if (!pte) {
1691                         first_pte = pte = pfn_to_dma_pte(domain, iov_pfn);
1692                         if (!pte)
1693                                 return -ENOMEM;
1694                 }
1695                 /* We don't need lock here, nobody else
1696                  * touches the iova range
1697                  */
1698                 tmp = cmpxchg64_local(&pte->val, 0ULL, pteval);
1699                 if (tmp) {
1700                         static int dumps = 5;
1701                         printk(KERN_CRIT "ERROR: DMA PTE for vPFN 0x%lx already set (to %llx not %llx)\n",
1702                                iov_pfn, tmp, (unsigned long long)pteval);
1703                         if (dumps) {
1704                                 dumps--;
1705                                 debug_dma_dump_mappings(NULL);
1706                         }
1707                         WARN_ON(1);
1708                 }
1709                 pte++;
1710                 if (!nr_pages || first_pte_in_page(pte)) {
1711                         domain_flush_cache(domain, first_pte,
1712                                            (void *)pte - (void *)first_pte);
1713                         pte = NULL;
1714                 }
1715                 iov_pfn++;
1716                 pteval += VTD_PAGE_SIZE;
1717                 sg_res--;
1718                 if (!sg_res)
1719                         sg = sg_next(sg);
1720         }
1721         return 0;
1722 }
1723
1724 static inline int domain_sg_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
1725                                     struct scatterlist *sg, unsigned long nr_pages,
1726                                     int prot)
1727 {
1728         return __domain_mapping(domain, iov_pfn, sg, 0, nr_pages, prot);
1729 }
1730
1731 static inline int domain_pfn_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
1732                                      unsigned long phys_pfn, unsigned long nr_pages,
1733                                      int prot)
1734 {
1735         return __domain_mapping(domain, iov_pfn, NULL, phys_pfn, nr_pages, prot);
1736 }
1737
1738 static void iommu_detach_dev(struct intel_iommu *iommu, u8 bus, u8 devfn)
1739 {
1740         if (!iommu)
1741                 return;
1742
1743         clear_context_table(iommu, bus, devfn);
1744         iommu->flush.flush_context(iommu, 0, 0, 0,
1745                                            DMA_CCMD_GLOBAL_INVL);
1746         iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
1747 }
1748
1749 static void domain_remove_dev_info(struct dmar_domain *domain)
1750 {
1751         struct device_domain_info *info;
1752         unsigned long flags;
1753         struct intel_iommu *iommu;
1754
1755         spin_lock_irqsave(&device_domain_lock, flags);
1756         while (!list_empty(&domain->devices)) {
1757                 info = list_entry(domain->devices.next,
1758                         struct device_domain_info, link);
1759                 list_del(&info->link);
1760                 list_del(&info->global);
1761                 if (info->dev)
1762                         info->dev->dev.archdata.iommu = NULL;
1763                 spin_unlock_irqrestore(&device_domain_lock, flags);
1764
1765                 iommu_disable_dev_iotlb(info);
1766                 iommu = device_to_iommu(info->segment, info->bus, info->devfn);
1767                 iommu_detach_dev(iommu, info->bus, info->devfn);
1768                 free_devinfo_mem(info);
1769
1770                 spin_lock_irqsave(&device_domain_lock, flags);
1771         }
1772         spin_unlock_irqrestore(&device_domain_lock, flags);
1773 }
1774
1775 /*
1776  * find_domain
1777  * Note: we use struct pci_dev->dev.archdata.iommu stores the info
1778  */
1779 static struct dmar_domain *
1780 find_domain(struct pci_dev *pdev)
1781 {
1782         struct device_domain_info *info;
1783
1784         /* No lock here, assumes no domain exit in normal case */
1785         info = pdev->dev.archdata.iommu;
1786         if (info)
1787                 return info->domain;
1788         return NULL;
1789 }
1790
1791 /* domain is initialized */
1792 static struct dmar_domain *get_domain_for_dev(struct pci_dev *pdev, int gaw)
1793 {
1794         struct dmar_domain *domain, *found = NULL;
1795         struct intel_iommu *iommu;
1796         struct dmar_drhd_unit *drhd;
1797         struct device_domain_info *info, *tmp;
1798         struct pci_dev *dev_tmp;
1799         unsigned long flags;
1800         int bus = 0, devfn = 0;
1801         int segment;
1802         int ret;
1803
1804         domain = find_domain(pdev);
1805         if (domain)
1806                 return domain;
1807
1808         segment = pci_domain_nr(pdev->bus);
1809
1810         dev_tmp = pci_find_upstream_pcie_bridge(pdev);
1811         if (dev_tmp) {
1812                 if (dev_tmp->is_pcie) {
1813                         bus = dev_tmp->subordinate->number;
1814                         devfn = 0;
1815                 } else {
1816                         bus = dev_tmp->bus->number;
1817                         devfn = dev_tmp->devfn;
1818                 }
1819                 spin_lock_irqsave(&device_domain_lock, flags);
1820                 list_for_each_entry(info, &device_domain_list, global) {
1821                         if (info->segment == segment &&
1822                             info->bus == bus && info->devfn == devfn) {
1823                                 found = info->domain;
1824                                 break;
1825                         }
1826                 }
1827                 spin_unlock_irqrestore(&device_domain_lock, flags);
1828                 /* pcie-pci bridge already has a domain, uses it */
1829                 if (found) {
1830                         domain = found;
1831                         goto found_domain;
1832                 }
1833         }
1834
1835         domain = alloc_domain();
1836         if (!domain)
1837                 goto error;
1838
1839         /* Allocate new domain for the device */
1840         drhd = dmar_find_matched_drhd_unit(pdev);
1841         if (!drhd) {
1842                 printk(KERN_ERR "IOMMU: can't find DMAR for device %s\n",
1843                         pci_name(pdev));
1844                 return NULL;
1845         }
1846         iommu = drhd->iommu;
1847
1848         ret = iommu_attach_domain(domain, iommu);
1849         if (ret) {
1850                 domain_exit(domain);
1851                 goto error;
1852         }
1853
1854         if (domain_init(domain, gaw)) {
1855                 domain_exit(domain);
1856                 goto error;
1857         }
1858
1859         /* register pcie-to-pci device */
1860         if (dev_tmp) {
1861                 info = alloc_devinfo_mem();
1862                 if (!info) {
1863                         domain_exit(domain);
1864                         goto error;
1865                 }
1866                 info->segment = segment;
1867                 info->bus = bus;
1868                 info->devfn = devfn;
1869                 info->dev = NULL;
1870                 info->domain = domain;
1871                 /* This domain is shared by devices under p2p bridge */
1872                 domain->flags |= DOMAIN_FLAG_P2P_MULTIPLE_DEVICES;
1873
1874                 /* pcie-to-pci bridge already has a domain, uses it */
1875                 found = NULL;
1876                 spin_lock_irqsave(&device_domain_lock, flags);
1877                 list_for_each_entry(tmp, &device_domain_list, global) {
1878                         if (tmp->segment == segment &&
1879                             tmp->bus == bus && tmp->devfn == devfn) {
1880                                 found = tmp->domain;
1881                                 break;
1882                         }
1883                 }
1884                 if (found) {
1885                         free_devinfo_mem(info);
1886                         domain_exit(domain);
1887                         domain = found;
1888                 } else {
1889                         list_add(&info->link, &domain->devices);
1890                         list_add(&info->global, &device_domain_list);
1891                 }
1892                 spin_unlock_irqrestore(&device_domain_lock, flags);
1893         }
1894
1895 found_domain:
1896         info = alloc_devinfo_mem();
1897         if (!info)
1898                 goto error;
1899         info->segment = segment;
1900         info->bus = pdev->bus->number;
1901         info->devfn = pdev->devfn;
1902         info->dev = pdev;
1903         info->domain = domain;
1904         spin_lock_irqsave(&device_domain_lock, flags);
1905         /* somebody is fast */
1906         found = find_domain(pdev);
1907         if (found != NULL) {
1908                 spin_unlock_irqrestore(&device_domain_lock, flags);
1909                 if (found != domain) {
1910                         domain_exit(domain);
1911                         domain = found;
1912                 }
1913                 free_devinfo_mem(info);
1914                 return domain;
1915         }
1916         list_add(&info->link, &domain->devices);
1917         list_add(&info->global, &device_domain_list);
1918         pdev->dev.archdata.iommu = info;
1919         spin_unlock_irqrestore(&device_domain_lock, flags);
1920         return domain;
1921 error:
1922         /* recheck it here, maybe others set it */
1923         return find_domain(pdev);
1924 }
1925
1926 static int iommu_identity_mapping;
1927
1928 static int iommu_domain_identity_map(struct dmar_domain *domain,
1929                                      unsigned long long start,
1930                                      unsigned long long end)
1931 {
1932         unsigned long first_vpfn = start >> VTD_PAGE_SHIFT;
1933         unsigned long last_vpfn = end >> VTD_PAGE_SHIFT;
1934
1935         if (!reserve_iova(&domain->iovad, dma_to_mm_pfn(first_vpfn),
1936                           dma_to_mm_pfn(last_vpfn))) {
1937                 printk(KERN_ERR "IOMMU: reserve iova failed\n");
1938                 return -ENOMEM;
1939         }
1940
1941         pr_debug("Mapping reserved region %llx-%llx for domain %d\n",
1942                  start, end, domain->id);
1943         /*
1944          * RMRR range might have overlap with physical memory range,
1945          * clear it first
1946          */
1947         dma_pte_clear_range(domain, first_vpfn, last_vpfn);
1948
1949         return domain_pfn_mapping(domain, first_vpfn, first_vpfn,
1950                                   last_vpfn - first_vpfn + 1,
1951                                   DMA_PTE_READ|DMA_PTE_WRITE);
1952 }
1953
1954 static int iommu_prepare_identity_map(struct pci_dev *pdev,
1955                                       unsigned long long start,
1956                                       unsigned long long end)
1957 {
1958         struct dmar_domain *domain;
1959         int ret;
1960
1961         domain = get_domain_for_dev(pdev, DEFAULT_DOMAIN_ADDRESS_WIDTH);
1962         if (!domain)
1963                 return -ENOMEM;
1964
1965         /* For _hardware_ passthrough, don't bother. But for software
1966            passthrough, we do it anyway -- it may indicate a memory
1967            range which is reserved in E820, so which didn't get set
1968            up to start with in si_domain */
1969         if (domain == si_domain && hw_pass_through) {
1970                 printk("Ignoring identity map for HW passthrough device %s [0x%Lx - 0x%Lx]\n",
1971                        pci_name(pdev), start, end);
1972                 return 0;
1973         }
1974
1975         printk(KERN_INFO
1976                "IOMMU: Setting identity map for device %s [0x%Lx - 0x%Lx]\n",
1977                pci_name(pdev), start, end);
1978         
1979         if (end >> agaw_to_width(domain->agaw)) {
1980                 WARN(1, "Your BIOS is broken; RMRR exceeds permitted address width (%d bits)\n"
1981                      "BIOS vendor: %s; Ver: %s; Product Version: %s\n",
1982                      agaw_to_width(domain->agaw),
1983                      dmi_get_system_info(DMI_BIOS_VENDOR),
1984                      dmi_get_system_info(DMI_BIOS_VERSION),
1985                      dmi_get_system_info(DMI_PRODUCT_VERSION));
1986                 ret = -EIO;
1987                 goto error;
1988         }
1989
1990         ret = iommu_domain_identity_map(domain, start, end);
1991         if (ret)
1992                 goto error;
1993
1994         /* context entry init */
1995         ret = domain_context_mapping(domain, pdev, CONTEXT_TT_MULTI_LEVEL);
1996         if (ret)
1997                 goto error;
1998
1999         return 0;
2000
2001  error:
2002         domain_exit(domain);
2003         return ret;
2004 }
2005
2006 static inline int iommu_prepare_rmrr_dev(struct dmar_rmrr_unit *rmrr,
2007         struct pci_dev *pdev)
2008 {
2009         if (pdev->dev.archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO)
2010                 return 0;
2011         return iommu_prepare_identity_map(pdev, rmrr->base_address,
2012                 rmrr->end_address + 1);
2013 }
2014
2015 #ifdef CONFIG_DMAR_FLOPPY_WA
2016 static inline void iommu_prepare_isa(void)
2017 {
2018         struct pci_dev *pdev;
2019         int ret;
2020
2021         pdev = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, NULL);
2022         if (!pdev)
2023                 return;
2024
2025         printk(KERN_INFO "IOMMU: Prepare 0-16MiB unity mapping for LPC\n");
2026         ret = iommu_prepare_identity_map(pdev, 0, 16*1024*1024);
2027
2028         if (ret)
2029                 printk(KERN_ERR "IOMMU: Failed to create 0-16MiB identity map; "
2030                        "floppy might not work\n");
2031
2032 }
2033 #else
2034 static inline void iommu_prepare_isa(void)
2035 {
2036         return;
2037 }
2038 #endif /* !CONFIG_DMAR_FLPY_WA */
2039
2040 static int md_domain_init(struct dmar_domain *domain, int guest_width);
2041
2042 static int __init si_domain_work_fn(unsigned long start_pfn,
2043                                     unsigned long end_pfn, void *datax)
2044 {
2045         int *ret = datax;
2046
2047         *ret = iommu_domain_identity_map(si_domain,
2048                                          (uint64_t)start_pfn << PAGE_SHIFT,
2049                                          (uint64_t)end_pfn << PAGE_SHIFT);
2050         return *ret;
2051
2052 }
2053
2054 static int __init si_domain_init(int hw)
2055 {
2056         struct dmar_drhd_unit *drhd;
2057         struct intel_iommu *iommu;
2058         int nid, ret = 0;
2059
2060         si_domain = alloc_domain();
2061         if (!si_domain)
2062                 return -EFAULT;
2063
2064         pr_debug("Identity mapping domain is domain %d\n", si_domain->id);
2065
2066         for_each_active_iommu(iommu, drhd) {
2067                 ret = iommu_attach_domain(si_domain, iommu);
2068                 if (ret) {
2069                         domain_exit(si_domain);
2070                         return -EFAULT;
2071                 }
2072         }
2073
2074         if (md_domain_init(si_domain, DEFAULT_DOMAIN_ADDRESS_WIDTH)) {
2075                 domain_exit(si_domain);
2076                 return -EFAULT;
2077         }
2078
2079         si_domain->flags = DOMAIN_FLAG_STATIC_IDENTITY;
2080
2081         if (hw)
2082                 return 0;
2083
2084         for_each_online_node(nid) {
2085                 work_with_active_regions(nid, si_domain_work_fn, &ret);
2086                 if (ret)
2087                         return ret;
2088         }
2089
2090         return 0;
2091 }
2092
2093 static void domain_remove_one_dev_info(struct dmar_domain *domain,
2094                                           struct pci_dev *pdev);
2095 static int identity_mapping(struct pci_dev *pdev)
2096 {
2097         struct device_domain_info *info;
2098
2099         if (likely(!iommu_identity_mapping))
2100                 return 0;
2101
2102
2103         list_for_each_entry(info, &si_domain->devices, link)
2104                 if (info->dev == pdev)
2105                         return 1;
2106         return 0;
2107 }
2108
2109 static int domain_add_dev_info(struct dmar_domain *domain,
2110                                struct pci_dev *pdev,
2111                                int translation)
2112 {
2113         struct device_domain_info *info;
2114         unsigned long flags;
2115         int ret;
2116
2117         info = alloc_devinfo_mem();
2118         if (!info)
2119                 return -ENOMEM;
2120
2121         ret = domain_context_mapping(domain, pdev, translation);
2122         if (ret) {
2123                 free_devinfo_mem(info);
2124                 return ret;
2125         }
2126
2127         info->segment = pci_domain_nr(pdev->bus);
2128         info->bus = pdev->bus->number;
2129         info->devfn = pdev->devfn;
2130         info->dev = pdev;
2131         info->domain = domain;
2132
2133         spin_lock_irqsave(&device_domain_lock, flags);
2134         list_add(&info->link, &domain->devices);
2135         list_add(&info->global, &device_domain_list);
2136         pdev->dev.archdata.iommu = info;
2137         spin_unlock_irqrestore(&device_domain_lock, flags);
2138
2139         return 0;
2140 }
2141
2142 static int iommu_should_identity_map(struct pci_dev *pdev, int startup)
2143 {
2144         if (iommu_identity_mapping == 2)
2145                 return IS_GFX_DEVICE(pdev);
2146
2147         /*
2148          * We want to start off with all devices in the 1:1 domain, and
2149          * take them out later if we find they can't access all of memory.
2150          *
2151          * However, we can't do this for PCI devices behind bridges,
2152          * because all PCI devices behind the same bridge will end up
2153          * with the same source-id on their transactions.
2154          *
2155          * Practically speaking, we can't change things around for these
2156          * devices at run-time, because we can't be sure there'll be no
2157          * DMA transactions in flight for any of their siblings.
2158          * 
2159          * So PCI devices (unless they're on the root bus) as well as
2160          * their parent PCI-PCI or PCIe-PCI bridges must be left _out_ of
2161          * the 1:1 domain, just in _case_ one of their siblings turns out
2162          * not to be able to map all of memory.
2163          */
2164         if (!pdev->is_pcie) {
2165                 if (!pci_is_root_bus(pdev->bus))
2166                         return 0;
2167                 if (pdev->class >> 8 == PCI_CLASS_BRIDGE_PCI)
2168                         return 0;
2169         } else if (pdev->pcie_type == PCI_EXP_TYPE_PCI_BRIDGE)
2170                 return 0;
2171
2172         /* 
2173          * At boot time, we don't yet know if devices will be 64-bit capable.
2174          * Assume that they will -- if they turn out not to be, then we can 
2175          * take them out of the 1:1 domain later.
2176          */
2177         if (!startup)
2178                 return pdev->dma_mask > DMA_BIT_MASK(32);
2179
2180         return 1;
2181 }
2182
2183 static int __init iommu_prepare_static_identity_mapping(int hw)
2184 {
2185         struct pci_dev *pdev = NULL;
2186         int ret;
2187
2188         ret = si_domain_init(hw);
2189         if (ret)
2190                 return -EFAULT;
2191
2192         for_each_pci_dev(pdev) {
2193                 if (iommu_should_identity_map(pdev, 1)) {
2194                         printk(KERN_INFO "IOMMU: %s identity mapping for device %s\n",
2195                                hw ? "hardware" : "software", pci_name(pdev));
2196
2197                         ret = domain_add_dev_info(si_domain, pdev,
2198                                                      hw ? CONTEXT_TT_PASS_THROUGH :
2199                                                      CONTEXT_TT_MULTI_LEVEL);
2200                         if (ret)
2201                                 return ret;
2202                 }
2203         }
2204
2205         return 0;
2206 }
2207
2208 int __init init_dmars(void)
2209 {
2210         struct dmar_drhd_unit *drhd;
2211         struct dmar_rmrr_unit *rmrr;
2212         struct pci_dev *pdev;
2213         struct intel_iommu *iommu;
2214         int i, ret;
2215
2216         /*
2217          * for each drhd
2218          *    allocate root
2219          *    initialize and program root entry to not present
2220          * endfor
2221          */
2222         for_each_drhd_unit(drhd) {
2223                 g_num_of_iommus++;
2224                 /*
2225                  * lock not needed as this is only incremented in the single
2226                  * threaded kernel __init code path all other access are read
2227                  * only
2228                  */
2229         }
2230
2231         g_iommus = kcalloc(g_num_of_iommus, sizeof(struct intel_iommu *),
2232                         GFP_KERNEL);
2233         if (!g_iommus) {
2234                 printk(KERN_ERR "Allocating global iommu array failed\n");
2235                 ret = -ENOMEM;
2236                 goto error;
2237         }
2238
2239         deferred_flush = kzalloc(g_num_of_iommus *
2240                 sizeof(struct deferred_flush_tables), GFP_KERNEL);
2241         if (!deferred_flush) {
2242                 ret = -ENOMEM;
2243                 goto error;
2244         }
2245
2246         for_each_drhd_unit(drhd) {
2247                 if (drhd->ignored)
2248                         continue;
2249
2250                 iommu = drhd->iommu;
2251                 g_iommus[iommu->seq_id] = iommu;
2252
2253                 ret = iommu_init_domains(iommu);
2254                 if (ret)
2255                         goto error;
2256
2257                 /*
2258                  * TBD:
2259                  * we could share the same root & context tables
2260                  * amoung all IOMMU's. Need to Split it later.
2261                  */
2262                 ret = iommu_alloc_root_entry(iommu);
2263                 if (ret) {
2264                         printk(KERN_ERR "IOMMU: allocate root entry failed\n");
2265                         goto error;
2266                 }
2267                 if (!ecap_pass_through(iommu->ecap))
2268                         hw_pass_through = 0;
2269         }
2270
2271         /*
2272          * Start from the sane iommu hardware state.
2273          */
2274         for_each_drhd_unit(drhd) {
2275                 if (drhd->ignored)
2276                         continue;
2277
2278                 iommu = drhd->iommu;
2279
2280                 /*
2281                  * If the queued invalidation is already initialized by us
2282                  * (for example, while enabling interrupt-remapping) then
2283                  * we got the things already rolling from a sane state.
2284                  */
2285                 if (iommu->qi)
2286                         continue;
2287
2288                 /*
2289                  * Clear any previous faults.
2290                  */
2291                 dmar_fault(-1, iommu);
2292                 /*
2293                  * Disable queued invalidation if supported and already enabled
2294                  * before OS handover.
2295                  */
2296                 dmar_disable_qi(iommu);
2297         }
2298
2299         for_each_drhd_unit(drhd) {
2300                 if (drhd->ignored)
2301                         continue;
2302
2303                 iommu = drhd->iommu;
2304
2305                 if (dmar_enable_qi(iommu)) {
2306                         /*
2307                          * Queued Invalidate not enabled, use Register Based
2308                          * Invalidate
2309                          */
2310                         iommu->flush.flush_context = __iommu_flush_context;
2311                         iommu->flush.flush_iotlb = __iommu_flush_iotlb;
2312                         printk(KERN_INFO "IOMMU 0x%Lx: using Register based "
2313                                "invalidation\n",
2314                                (unsigned long long)drhd->reg_base_addr);
2315                 } else {
2316                         iommu->flush.flush_context = qi_flush_context;
2317                         iommu->flush.flush_iotlb = qi_flush_iotlb;
2318                         printk(KERN_INFO "IOMMU 0x%Lx: using Queued "
2319                                "invalidation\n",
2320                                (unsigned long long)drhd->reg_base_addr);
2321                 }
2322         }
2323
2324         if (iommu_pass_through)
2325                 iommu_identity_mapping = 1;
2326 #ifdef CONFIG_DMAR_BROKEN_GFX_WA
2327         else
2328                 iommu_identity_mapping = 2;
2329 #endif
2330         /*
2331          * If pass through is not set or not enabled, setup context entries for
2332          * identity mappings for rmrr, gfx, and isa and may fall back to static
2333          * identity mapping if iommu_identity_mapping is set.
2334          */
2335         if (iommu_identity_mapping) {
2336                 ret = iommu_prepare_static_identity_mapping(hw_pass_through);
2337                 if (ret) {
2338                         printk(KERN_CRIT "Failed to setup IOMMU pass-through\n");
2339                         goto error;
2340                 }
2341         }
2342         /*
2343          * For each rmrr
2344          *   for each dev attached to rmrr
2345          *   do
2346          *     locate drhd for dev, alloc domain for dev
2347          *     allocate free domain
2348          *     allocate page table entries for rmrr
2349          *     if context not allocated for bus
2350          *           allocate and init context
2351          *           set present in root table for this bus
2352          *     init context with domain, translation etc
2353          *    endfor
2354          * endfor
2355          */
2356         printk(KERN_INFO "IOMMU: Setting RMRR:\n");
2357         for_each_rmrr_units(rmrr) {
2358                 for (i = 0; i < rmrr->devices_cnt; i++) {
2359                         pdev = rmrr->devices[i];
2360                         /*
2361                          * some BIOS lists non-exist devices in DMAR
2362                          * table.
2363                          */
2364                         if (!pdev)
2365                                 continue;
2366                         ret = iommu_prepare_rmrr_dev(rmrr, pdev);
2367                         if (ret)
2368                                 printk(KERN_ERR
2369                                        "IOMMU: mapping reserved region failed\n");
2370                 }
2371         }
2372
2373         iommu_prepare_isa();
2374
2375         /*
2376          * for each drhd
2377          *   enable fault log
2378          *   global invalidate context cache
2379          *   global invalidate iotlb
2380          *   enable translation
2381          */
2382         for_each_drhd_unit(drhd) {
2383                 if (drhd->ignored)
2384                         continue;
2385                 iommu = drhd->iommu;
2386
2387                 iommu_flush_write_buffer(iommu);
2388
2389                 ret = dmar_set_interrupt(iommu);
2390                 if (ret)
2391                         goto error;
2392
2393                 iommu_set_root_entry(iommu);
2394
2395                 iommu->flush.flush_context(iommu, 0, 0, 0, DMA_CCMD_GLOBAL_INVL);
2396                 iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
2397                 iommu_disable_protect_mem_regions(iommu);
2398
2399                 ret = iommu_enable_translation(iommu);
2400                 if (ret)
2401                         goto error;
2402         }
2403
2404         return 0;
2405 error:
2406         for_each_drhd_unit(drhd) {
2407                 if (drhd->ignored)
2408                         continue;
2409                 iommu = drhd->iommu;
2410                 free_iommu(iommu);
2411         }
2412         kfree(g_iommus);
2413         return ret;
2414 }
2415
2416 /* This takes a number of _MM_ pages, not VTD pages */
2417 static struct iova *intel_alloc_iova(struct device *dev,
2418                                      struct dmar_domain *domain,
2419                                      unsigned long nrpages, uint64_t dma_mask)
2420 {
2421         struct pci_dev *pdev = to_pci_dev(dev);
2422         struct iova *iova = NULL;
2423
2424         /* Restrict dma_mask to the width that the iommu can handle */
2425         dma_mask = min_t(uint64_t, DOMAIN_MAX_ADDR(domain->gaw), dma_mask);
2426
2427         if (!dmar_forcedac && dma_mask > DMA_BIT_MASK(32)) {
2428                 /*
2429                  * First try to allocate an io virtual address in
2430                  * DMA_BIT_MASK(32) and if that fails then try allocating
2431                  * from higher range
2432                  */
2433                 iova = alloc_iova(&domain->iovad, nrpages,
2434                                   IOVA_PFN(DMA_BIT_MASK(32)), 1);
2435                 if (iova)
2436                         return iova;
2437         }
2438         iova = alloc_iova(&domain->iovad, nrpages, IOVA_PFN(dma_mask), 1);
2439         if (unlikely(!iova)) {
2440                 printk(KERN_ERR "Allocating %ld-page iova for %s failed",
2441                        nrpages, pci_name(pdev));
2442                 return NULL;
2443         }
2444
2445         return iova;
2446 }
2447
2448 static struct dmar_domain *__get_valid_domain_for_dev(struct pci_dev *pdev)
2449 {
2450         struct dmar_domain *domain;
2451         int ret;
2452
2453         domain = get_domain_for_dev(pdev,
2454                         DEFAULT_DOMAIN_ADDRESS_WIDTH);
2455         if (!domain) {
2456                 printk(KERN_ERR
2457                         "Allocating domain for %s failed", pci_name(pdev));
2458                 return NULL;
2459         }
2460
2461         /* make sure context mapping is ok */
2462         if (unlikely(!domain_context_mapped(pdev))) {
2463                 ret = domain_context_mapping(domain, pdev,
2464                                              CONTEXT_TT_MULTI_LEVEL);
2465                 if (ret) {
2466                         printk(KERN_ERR
2467                                 "Domain context map for %s failed",
2468                                 pci_name(pdev));
2469                         return NULL;
2470                 }
2471         }
2472
2473         return domain;
2474 }
2475
2476 static inline struct dmar_domain *get_valid_domain_for_dev(struct pci_dev *dev)
2477 {
2478         struct device_domain_info *info;
2479
2480         /* No lock here, assumes no domain exit in normal case */
2481         info = dev->dev.archdata.iommu;
2482         if (likely(info))
2483                 return info->domain;
2484
2485         return __get_valid_domain_for_dev(dev);
2486 }
2487
2488 static int iommu_dummy(struct pci_dev *pdev)
2489 {
2490         return pdev->dev.archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO;
2491 }
2492
2493 /* Check if the pdev needs to go through non-identity map and unmap process.*/
2494 static int iommu_no_mapping(struct device *dev)
2495 {
2496         struct pci_dev *pdev;
2497         int found;
2498
2499         if (unlikely(dev->bus != &pci_bus_type))
2500                 return 1;
2501
2502         pdev = to_pci_dev(dev);
2503         if (iommu_dummy(pdev))
2504                 return 1;
2505
2506         if (!iommu_identity_mapping)
2507                 return 0;
2508
2509         found = identity_mapping(pdev);
2510         if (found) {
2511                 if (iommu_should_identity_map(pdev, 0))
2512                         return 1;
2513                 else {
2514                         /*
2515                          * 32 bit DMA is removed from si_domain and fall back
2516                          * to non-identity mapping.
2517                          */
2518                         domain_remove_one_dev_info(si_domain, pdev);
2519                         printk(KERN_INFO "32bit %s uses non-identity mapping\n",
2520                                pci_name(pdev));
2521                         return 0;
2522                 }
2523         } else {
2524                 /*
2525                  * In case of a detached 64 bit DMA device from vm, the device
2526                  * is put into si_domain for identity mapping.
2527                  */
2528                 if (iommu_should_identity_map(pdev, 0)) {
2529                         int ret;
2530                         ret = domain_add_dev_info(si_domain, pdev,
2531                                                   hw_pass_through ?
2532                                                   CONTEXT_TT_PASS_THROUGH :
2533                                                   CONTEXT_TT_MULTI_LEVEL);
2534                         if (!ret) {
2535                                 printk(KERN_INFO "64bit %s uses identity mapping\n",
2536                                        pci_name(pdev));
2537                                 return 1;
2538                         }
2539                 }
2540         }
2541
2542         return 0;
2543 }
2544
2545 static dma_addr_t __intel_map_single(struct device *hwdev, phys_addr_t paddr,
2546                                      size_t size, int dir, u64 dma_mask)
2547 {
2548         struct pci_dev *pdev = to_pci_dev(hwdev);
2549         struct dmar_domain *domain;
2550         phys_addr_t start_paddr;
2551         struct iova *iova;
2552         int prot = 0;
2553         int ret;
2554         struct intel_iommu *iommu;
2555         unsigned long paddr_pfn = paddr >> PAGE_SHIFT;
2556
2557         BUG_ON(dir == DMA_NONE);
2558
2559         if (iommu_no_mapping(hwdev))
2560                 return paddr;
2561
2562         domain = get_valid_domain_for_dev(pdev);
2563         if (!domain)
2564                 return 0;
2565
2566         iommu = domain_get_iommu(domain);
2567         size = aligned_nrpages(paddr, size);
2568
2569         iova = intel_alloc_iova(hwdev, domain, dma_to_mm_pfn(size),
2570                                 pdev->dma_mask);
2571         if (!iova)
2572                 goto error;
2573
2574         /*
2575          * Check if DMAR supports zero-length reads on write only
2576          * mappings..
2577          */
2578         if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL || \
2579                         !cap_zlr(iommu->cap))
2580                 prot |= DMA_PTE_READ;
2581         if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)
2582                 prot |= DMA_PTE_WRITE;
2583         /*
2584          * paddr - (paddr + size) might be partial page, we should map the whole
2585          * page.  Note: if two part of one page are separately mapped, we
2586          * might have two guest_addr mapping to the same host paddr, but this
2587          * is not a big problem
2588          */
2589         ret = domain_pfn_mapping(domain, mm_to_dma_pfn(iova->pfn_lo),
2590                                  mm_to_dma_pfn(paddr_pfn), size, prot);
2591         if (ret)
2592                 goto error;
2593
2594         /* it's a non-present to present mapping. Only flush if caching mode */
2595         if (cap_caching_mode(iommu->cap))
2596                 iommu_flush_iotlb_psi(iommu, 0, mm_to_dma_pfn(iova->pfn_lo), size);
2597         else
2598                 iommu_flush_write_buffer(iommu);
2599
2600         start_paddr = (phys_addr_t)iova->pfn_lo << PAGE_SHIFT;
2601         start_paddr += paddr & ~PAGE_MASK;
2602         return start_paddr;
2603
2604 error:
2605         if (iova)
2606                 __free_iova(&domain->iovad, iova);
2607         printk(KERN_ERR"Device %s request: %zx@%llx dir %d --- failed\n",
2608                 pci_name(pdev), size, (unsigned long long)paddr, dir);
2609         return 0;
2610 }
2611
2612 static dma_addr_t intel_map_page(struct device *dev, struct page *page,
2613                                  unsigned long offset, size_t size,
2614                                  enum dma_data_direction dir,
2615                                  struct dma_attrs *attrs)
2616 {
2617         return __intel_map_single(dev, page_to_phys(page) + offset, size,
2618                                   dir, to_pci_dev(dev)->dma_mask);
2619 }
2620
2621 static void flush_unmaps(void)
2622 {
2623         int i, j;
2624
2625         timer_on = 0;
2626
2627         /* just flush them all */
2628         for (i = 0; i < g_num_of_iommus; i++) {
2629                 struct intel_iommu *iommu = g_iommus[i];
2630                 if (!iommu)
2631                         continue;
2632
2633                 if (!deferred_flush[i].next)
2634                         continue;
2635
2636                 iommu->flush.flush_iotlb(iommu, 0, 0, 0,
2637                                          DMA_TLB_GLOBAL_FLUSH);
2638                 for (j = 0; j < deferred_flush[i].next; j++) {
2639                         unsigned long mask;
2640                         struct iova *iova = deferred_flush[i].iova[j];
2641
2642                         mask = (iova->pfn_hi - iova->pfn_lo + 1) << PAGE_SHIFT;
2643                         mask = ilog2(mask >> VTD_PAGE_SHIFT);
2644                         iommu_flush_dev_iotlb(deferred_flush[i].domain[j],
2645                                         iova->pfn_lo << PAGE_SHIFT, mask);
2646                         __free_iova(&deferred_flush[i].domain[j]->iovad, iova);
2647                 }
2648                 deferred_flush[i].next = 0;
2649         }
2650
2651         list_size = 0;
2652 }
2653
2654 static void flush_unmaps_timeout(unsigned long data)
2655 {
2656         unsigned long flags;
2657
2658         spin_lock_irqsave(&async_umap_flush_lock, flags);
2659         flush_unmaps();
2660         spin_unlock_irqrestore(&async_umap_flush_lock, flags);
2661 }
2662
2663 static void add_unmap(struct dmar_domain *dom, struct iova *iova)
2664 {
2665         unsigned long flags;
2666         int next, iommu_id;
2667         struct intel_iommu *iommu;
2668
2669         spin_lock_irqsave(&async_umap_flush_lock, flags);
2670         if (list_size == HIGH_WATER_MARK)
2671                 flush_unmaps();
2672
2673         iommu = domain_get_iommu(dom);
2674         iommu_id = iommu->seq_id;
2675
2676         next = deferred_flush[iommu_id].next;
2677         deferred_flush[iommu_id].domain[next] = dom;
2678         deferred_flush[iommu_id].iova[next] = iova;
2679         deferred_flush[iommu_id].next++;
2680
2681         if (!timer_on) {
2682                 mod_timer(&unmap_timer, jiffies + msecs_to_jiffies(10));
2683                 timer_on = 1;
2684         }
2685         list_size++;
2686         spin_unlock_irqrestore(&async_umap_flush_lock, flags);
2687 }
2688
2689 static void intel_unmap_page(struct device *dev, dma_addr_t dev_addr,
2690                              size_t size, enum dma_data_direction dir,
2691                              struct dma_attrs *attrs)
2692 {
2693         struct pci_dev *pdev = to_pci_dev(dev);
2694         struct dmar_domain *domain;
2695         unsigned long start_pfn, last_pfn;
2696         struct iova *iova;
2697         struct intel_iommu *iommu;
2698
2699         if (iommu_no_mapping(dev))
2700                 return;
2701
2702         domain = find_domain(pdev);
2703         BUG_ON(!domain);
2704
2705         iommu = domain_get_iommu(domain);
2706
2707         iova = find_iova(&domain->iovad, IOVA_PFN(dev_addr));
2708         if (WARN_ONCE(!iova, "Driver unmaps unmatched page at PFN %llx\n",
2709                       (unsigned long long)dev_addr))
2710                 return;
2711
2712         start_pfn = mm_to_dma_pfn(iova->pfn_lo);
2713         last_pfn = mm_to_dma_pfn(iova->pfn_hi + 1) - 1;
2714
2715         pr_debug("Device %s unmapping: pfn %lx-%lx\n",
2716                  pci_name(pdev), start_pfn, last_pfn);
2717
2718         /*  clear the whole page */
2719         dma_pte_clear_range(domain, start_pfn, last_pfn);
2720
2721         /* free page tables */
2722         dma_pte_free_pagetable(domain, start_pfn, last_pfn);
2723
2724         if (intel_iommu_strict) {
2725                 iommu_flush_iotlb_psi(iommu, domain->id, start_pfn,
2726                                       last_pfn - start_pfn + 1);
2727                 /* free iova */
2728                 __free_iova(&domain->iovad, iova);
2729         } else {
2730                 add_unmap(domain, iova);
2731                 /*
2732                  * queue up the release of the unmap to save the 1/6th of the
2733                  * cpu used up by the iotlb flush operation...
2734                  */
2735         }
2736 }
2737
2738 static void *intel_alloc_coherent(struct device *hwdev, size_t size,
2739                                   dma_addr_t *dma_handle, gfp_t flags)
2740 {
2741         void *vaddr;
2742         int order;
2743
2744         size = PAGE_ALIGN(size);
2745         order = get_order(size);
2746         flags &= ~(GFP_DMA | GFP_DMA32);
2747
2748         vaddr = (void *)__get_free_pages(flags, order);
2749         if (!vaddr)
2750                 return NULL;
2751         memset(vaddr, 0, size);
2752
2753         *dma_handle = __intel_map_single(hwdev, virt_to_bus(vaddr), size,
2754                                          DMA_BIDIRECTIONAL,
2755                                          hwdev->coherent_dma_mask);
2756         if (*dma_handle)
2757                 return vaddr;
2758         free_pages((unsigned long)vaddr, order);
2759         return NULL;
2760 }
2761
2762 static void intel_free_coherent(struct device *hwdev, size_t size, void *vaddr,
2763                                 dma_addr_t dma_handle)
2764 {
2765         int order;
2766
2767         size = PAGE_ALIGN(size);
2768         order = get_order(size);
2769
2770         intel_unmap_page(hwdev, dma_handle, size, DMA_BIDIRECTIONAL, NULL);
2771         free_pages((unsigned long)vaddr, order);
2772 }
2773
2774 static void intel_unmap_sg(struct device *hwdev, struct scatterlist *sglist,
2775                            int nelems, enum dma_data_direction dir,
2776                            struct dma_attrs *attrs)
2777 {
2778         struct pci_dev *pdev = to_pci_dev(hwdev);
2779         struct dmar_domain *domain;
2780         unsigned long start_pfn, last_pfn;
2781         struct iova *iova;
2782         struct intel_iommu *iommu;
2783
2784         if (iommu_no_mapping(hwdev))
2785                 return;
2786
2787         domain = find_domain(pdev);
2788         BUG_ON(!domain);
2789
2790         iommu = domain_get_iommu(domain);
2791
2792         iova = find_iova(&domain->iovad, IOVA_PFN(sglist[0].dma_address));
2793         if (WARN_ONCE(!iova, "Driver unmaps unmatched sglist at PFN %llx\n",
2794                       (unsigned long long)sglist[0].dma_address))
2795                 return;
2796
2797         start_pfn = mm_to_dma_pfn(iova->pfn_lo);
2798         last_pfn = mm_to_dma_pfn(iova->pfn_hi + 1) - 1;
2799
2800         /*  clear the whole page */
2801         dma_pte_clear_range(domain, start_pfn, last_pfn);
2802
2803         /* free page tables */
2804         dma_pte_free_pagetable(domain, start_pfn, last_pfn);
2805
2806         if (intel_iommu_strict) {
2807                 iommu_flush_iotlb_psi(iommu, domain->id, start_pfn,
2808                                       last_pfn - start_pfn + 1);
2809                 /* free iova */
2810                 __free_iova(&domain->iovad, iova);
2811         } else {
2812                 add_unmap(domain, iova);
2813                 /*
2814                  * queue up the release of the unmap to save the 1/6th of the
2815                  * cpu used up by the iotlb flush operation...
2816                  */
2817         }
2818 }
2819
2820 static int intel_nontranslate_map_sg(struct device *hddev,
2821         struct scatterlist *sglist, int nelems, int dir)
2822 {
2823         int i;
2824         struct scatterlist *sg;
2825
2826         for_each_sg(sglist, sg, nelems, i) {
2827                 BUG_ON(!sg_page(sg));
2828                 sg->dma_address = page_to_phys(sg_page(sg)) + sg->offset;
2829                 sg->dma_length = sg->length;
2830         }
2831         return nelems;
2832 }
2833
2834 static int intel_map_sg(struct device *hwdev, struct scatterlist *sglist, int nelems,
2835                         enum dma_data_direction dir, struct dma_attrs *attrs)
2836 {
2837         int i;
2838         struct pci_dev *pdev = to_pci_dev(hwdev);
2839         struct dmar_domain *domain;
2840         size_t size = 0;
2841         int prot = 0;
2842         size_t offset_pfn = 0;
2843         struct iova *iova = NULL;
2844         int ret;
2845         struct scatterlist *sg;
2846         unsigned long start_vpfn;
2847         struct intel_iommu *iommu;
2848
2849         BUG_ON(dir == DMA_NONE);
2850         if (iommu_no_mapping(hwdev))
2851                 return intel_nontranslate_map_sg(hwdev, sglist, nelems, dir);
2852
2853         domain = get_valid_domain_for_dev(pdev);
2854         if (!domain)
2855                 return 0;
2856
2857         iommu = domain_get_iommu(domain);
2858
2859         for_each_sg(sglist, sg, nelems, i)
2860                 size += aligned_nrpages(sg->offset, sg->length);
2861
2862         iova = intel_alloc_iova(hwdev, domain, dma_to_mm_pfn(size),
2863                                 pdev->dma_mask);
2864         if (!iova) {
2865                 sglist->dma_length = 0;
2866                 return 0;
2867         }
2868
2869         /*
2870          * Check if DMAR supports zero-length reads on write only
2871          * mappings..
2872          */
2873         if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL || \
2874                         !cap_zlr(iommu->cap))
2875                 prot |= DMA_PTE_READ;
2876         if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)
2877                 prot |= DMA_PTE_WRITE;
2878
2879         start_vpfn = mm_to_dma_pfn(iova->pfn_lo);
2880
2881         ret = domain_sg_mapping(domain, start_vpfn, sglist, size, prot);
2882         if (unlikely(ret)) {
2883                 /*  clear the page */
2884                 dma_pte_clear_range(domain, start_vpfn,
2885                                     start_vpfn + size - 1);
2886                 /* free page tables */
2887                 dma_pte_free_pagetable(domain, start_vpfn,
2888                                        start_vpfn + size - 1);
2889                 /* free iova */
2890                 __free_iova(&domain->iovad, iova);
2891                 return 0;
2892         }
2893
2894         /* it's a non-present to present mapping. Only flush if caching mode */
2895         if (cap_caching_mode(iommu->cap))
2896                 iommu_flush_iotlb_psi(iommu, 0, start_vpfn, offset_pfn);
2897         else
2898                 iommu_flush_write_buffer(iommu);
2899
2900         return nelems;
2901 }
2902
2903 static int intel_mapping_error(struct device *dev, dma_addr_t dma_addr)
2904 {
2905         return !dma_addr;
2906 }
2907
2908 struct dma_map_ops intel_dma_ops = {
2909         .alloc_coherent = intel_alloc_coherent,
2910         .free_coherent = intel_free_coherent,
2911         .map_sg = intel_map_sg,
2912         .unmap_sg = intel_unmap_sg,
2913         .map_page = intel_map_page,
2914         .unmap_page = intel_unmap_page,
2915         .mapping_error = intel_mapping_error,
2916 };
2917
2918 static inline int iommu_domain_cache_init(void)
2919 {
2920         int ret = 0;
2921
2922         iommu_domain_cache = kmem_cache_create("iommu_domain",
2923                                          sizeof(struct dmar_domain),
2924                                          0,
2925                                          SLAB_HWCACHE_ALIGN,
2926
2927                                          NULL);
2928         if (!iommu_domain_cache) {
2929                 printk(KERN_ERR "Couldn't create iommu_domain cache\n");
2930                 ret = -ENOMEM;
2931         }
2932
2933         return ret;
2934 }
2935
2936 static inline int iommu_devinfo_cache_init(void)
2937 {
2938         int ret = 0;
2939
2940         iommu_devinfo_cache = kmem_cache_create("iommu_devinfo",
2941                                          sizeof(struct device_domain_info),
2942                                          0,
2943                                          SLAB_HWCACHE_ALIGN,
2944                                          NULL);
2945         if (!iommu_devinfo_cache) {
2946                 printk(KERN_ERR "Couldn't create devinfo cache\n");
2947                 ret = -ENOMEM;
2948         }
2949
2950         return ret;
2951 }
2952
2953 static inline int iommu_iova_cache_init(void)
2954 {
2955         int ret = 0;
2956
2957         iommu_iova_cache = kmem_cache_create("iommu_iova",
2958                                          sizeof(struct iova),
2959                                          0,
2960                                          SLAB_HWCACHE_ALIGN,
2961                                          NULL);
2962         if (!iommu_iova_cache) {
2963                 printk(KERN_ERR "Couldn't create iova cache\n");
2964                 ret = -ENOMEM;
2965         }
2966
2967         return ret;
2968 }
2969
2970 static int __init iommu_init_mempool(void)
2971 {
2972         int ret;
2973         ret = iommu_iova_cache_init();
2974         if (ret)
2975                 return ret;
2976
2977         ret = iommu_domain_cache_init();
2978         if (ret)
2979                 goto domain_error;
2980
2981         ret = iommu_devinfo_cache_init();
2982         if (!ret)
2983                 return ret;
2984
2985         kmem_cache_destroy(iommu_domain_cache);
2986 domain_error:
2987         kmem_cache_destroy(iommu_iova_cache);
2988
2989         return -ENOMEM;
2990 }
2991
2992 static void __init iommu_exit_mempool(void)
2993 {
2994         kmem_cache_destroy(iommu_devinfo_cache);
2995         kmem_cache_destroy(iommu_domain_cache);
2996         kmem_cache_destroy(iommu_iova_cache);
2997
2998 }
2999
3000 static void __init init_no_remapping_devices(void)
3001 {
3002         struct dmar_drhd_unit *drhd;
3003
3004         for_each_drhd_unit(drhd) {
3005                 if (!drhd->include_all) {
3006                         int i;
3007                         for (i = 0; i < drhd->devices_cnt; i++)
3008                                 if (drhd->devices[i] != NULL)
3009                                         break;
3010                         /* ignore DMAR unit if no pci devices exist */
3011                         if (i == drhd->devices_cnt)
3012                                 drhd->ignored = 1;
3013                 }
3014         }
3015
3016         if (dmar_map_gfx)
3017                 return;
3018
3019         for_each_drhd_unit(drhd) {
3020                 int i;
3021                 if (drhd->ignored || drhd->include_all)
3022                         continue;
3023
3024                 for (i = 0; i < drhd->devices_cnt; i++)
3025                         if (drhd->devices[i] &&
3026                                 !IS_GFX_DEVICE(drhd->devices[i]))
3027                                 break;
3028
3029                 if (i < drhd->devices_cnt)
3030                         continue;
3031
3032                 /* bypass IOMMU if it is just for gfx devices */
3033                 drhd->ignored = 1;
3034                 for (i = 0; i < drhd->devices_cnt; i++) {
3035                         if (!drhd->devices[i])
3036                                 continue;
3037                         drhd->devices[i]->dev.archdata.iommu = DUMMY_DEVICE_DOMAIN_INFO;
3038                 }
3039         }
3040 }
3041
3042 #ifdef CONFIG_SUSPEND
3043 static int init_iommu_hw(void)
3044 {
3045         struct dmar_drhd_unit *drhd;
3046         struct intel_iommu *iommu = NULL;
3047
3048         for_each_active_iommu(iommu, drhd)
3049                 if (iommu->qi)
3050                         dmar_reenable_qi(iommu);
3051
3052         for_each_active_iommu(iommu, drhd) {
3053                 iommu_flush_write_buffer(iommu);
3054
3055                 iommu_set_root_entry(iommu);
3056
3057                 iommu->flush.flush_context(iommu, 0, 0, 0,
3058                                            DMA_CCMD_GLOBAL_INVL);
3059                 iommu->flush.flush_iotlb(iommu, 0, 0, 0,
3060                                          DMA_TLB_GLOBAL_FLUSH);
3061                 iommu_disable_protect_mem_regions(iommu);
3062                 iommu_enable_translation(iommu);
3063         }
3064
3065         return 0;
3066 }
3067
3068 static void iommu_flush_all(void)
3069 {
3070         struct dmar_drhd_unit *drhd;
3071         struct intel_iommu *iommu;
3072
3073         for_each_active_iommu(iommu, drhd) {
3074                 iommu->flush.flush_context(iommu, 0, 0, 0,
3075                                            DMA_CCMD_GLOBAL_INVL);
3076                 iommu->flush.flush_iotlb(iommu, 0, 0, 0,
3077                                          DMA_TLB_GLOBAL_FLUSH);
3078         }
3079 }
3080
3081 static int iommu_suspend(struct sys_device *dev, pm_message_t state)
3082 {
3083         struct dmar_drhd_unit *drhd;
3084         struct intel_iommu *iommu = NULL;
3085         unsigned long flag;
3086
3087         for_each_active_iommu(iommu, drhd) {
3088                 iommu->iommu_state = kzalloc(sizeof(u32) * MAX_SR_DMAR_REGS,
3089                                                  GFP_ATOMIC);
3090                 if (!iommu->iommu_state)
3091                         goto nomem;
3092         }
3093
3094         iommu_flush_all();
3095
3096         for_each_active_iommu(iommu, drhd) {
3097                 iommu_disable_translation(iommu);
3098
3099                 spin_lock_irqsave(&iommu->register_lock, flag);
3100
3101                 iommu->iommu_state[SR_DMAR_FECTL_REG] =
3102                         readl(iommu->reg + DMAR_FECTL_REG);
3103                 iommu->iommu_state[SR_DMAR_FEDATA_REG] =
3104                         readl(iommu->reg + DMAR_FEDATA_REG);
3105                 iommu->iommu_state[SR_DMAR_FEADDR_REG] =
3106                         readl(iommu->reg + DMAR_FEADDR_REG);
3107                 iommu->iommu_state[SR_DMAR_FEUADDR_REG] =
3108                         readl(iommu->reg + DMAR_FEUADDR_REG);
3109
3110                 spin_unlock_irqrestore(&iommu->register_lock, flag);
3111         }
3112         return 0;
3113
3114 nomem:
3115         for_each_active_iommu(iommu, drhd)
3116                 kfree(iommu->iommu_state);
3117
3118         return -ENOMEM;
3119 }
3120
3121 static int iommu_resume(struct sys_device *dev)
3122 {
3123         struct dmar_drhd_unit *drhd;
3124         struct intel_iommu *iommu = NULL;
3125         unsigned long flag;
3126
3127         if (init_iommu_hw()) {
3128                 WARN(1, "IOMMU setup failed, DMAR can not resume!\n");
3129                 return -EIO;
3130         }
3131
3132         for_each_active_iommu(iommu, drhd) {
3133
3134                 spin_lock_irqsave(&iommu->register_lock, flag);
3135
3136                 writel(iommu->iommu_state[SR_DMAR_FECTL_REG],
3137                         iommu->reg + DMAR_FECTL_REG);
3138                 writel(iommu->iommu_state[SR_DMAR_FEDATA_REG],
3139                         iommu->reg + DMAR_FEDATA_REG);
3140                 writel(iommu->iommu_state[SR_DMAR_FEADDR_REG],
3141                         iommu->reg + DMAR_FEADDR_REG);
3142                 writel(iommu->iommu_state[SR_DMAR_FEUADDR_REG],
3143                         iommu->reg + DMAR_FEUADDR_REG);
3144
3145                 spin_unlock_irqrestore(&iommu->register_lock, flag);
3146         }
3147
3148         for_each_active_iommu(iommu, drhd)
3149                 kfree(iommu->iommu_state);
3150
3151         return 0;
3152 }
3153
3154 static struct sysdev_class iommu_sysclass = {
3155         .name           = "iommu",
3156         .resume         = iommu_resume,
3157         .suspend        = iommu_suspend,
3158 };
3159
3160 static struct sys_device device_iommu = {
3161         .cls    = &iommu_sysclass,
3162 };
3163
3164 static int __init init_iommu_sysfs(void)
3165 {
3166         int error;
3167
3168         error = sysdev_class_register(&iommu_sysclass);
3169         if (error)
3170                 return error;
3171
3172         error = sysdev_register(&device_iommu);
3173         if (error)
3174                 sysdev_class_unregister(&iommu_sysclass);
3175
3176         return error;
3177 }
3178
3179 #else
3180 static int __init init_iommu_sysfs(void)
3181 {
3182         return 0;
3183 }
3184 #endif  /* CONFIG_PM */
3185
3186 int __init intel_iommu_init(void)
3187 {
3188         int ret = 0;
3189
3190         if (dmar_table_init())
3191                 return  -ENODEV;
3192
3193         if (dmar_dev_scope_init())
3194                 return  -ENODEV;
3195
3196         /*
3197          * Check the need for DMA-remapping initialization now.
3198          * Above initialization will also be used by Interrupt-remapping.
3199          */
3200         if (no_iommu || swiotlb || dmar_disabled)
3201                 return -ENODEV;
3202
3203         iommu_init_mempool();
3204         dmar_init_reserved_ranges();
3205
3206         init_no_remapping_devices();
3207
3208         ret = init_dmars();
3209         if (ret) {
3210                 printk(KERN_ERR "IOMMU: dmar init failed\n");
3211                 put_iova_domain(&reserved_iova_list);
3212                 iommu_exit_mempool();
3213                 return ret;
3214         }
3215         printk(KERN_INFO
3216         "PCI-DMA: Intel(R) Virtualization Technology for Directed I/O\n");
3217
3218         init_timer(&unmap_timer);
3219         force_iommu = 1;
3220         dma_ops = &intel_dma_ops;
3221
3222         init_iommu_sysfs();
3223
3224         register_iommu(&intel_iommu_ops);
3225
3226         return 0;
3227 }
3228
3229 static void iommu_detach_dependent_devices(struct intel_iommu *iommu,
3230                                            struct pci_dev *pdev)
3231 {
3232         struct pci_dev *tmp, *parent;
3233
3234         if (!iommu || !pdev)
3235                 return;
3236
3237         /* dependent device detach */
3238         tmp = pci_find_upstream_pcie_bridge(pdev);
3239         /* Secondary interface's bus number and devfn 0 */
3240         if (tmp) {
3241                 parent = pdev->bus->self;
3242                 while (parent != tmp) {
3243                         iommu_detach_dev(iommu, parent->bus->number,
3244                                          parent->devfn);
3245                         parent = parent->bus->self;
3246                 }
3247                 if (tmp->is_pcie) /* this is a PCIE-to-PCI bridge */
3248                         iommu_detach_dev(iommu,
3249                                 tmp->subordinate->number, 0);
3250                 else /* this is a legacy PCI bridge */
3251                         iommu_detach_dev(iommu, tmp->bus->number,
3252                                          tmp->devfn);
3253         }
3254 }
3255
3256 static void domain_remove_one_dev_info(struct dmar_domain *domain,
3257                                           struct pci_dev *pdev)
3258 {
3259         struct device_domain_info *info;
3260         struct intel_iommu *iommu;
3261         unsigned long flags;
3262         int found = 0;
3263         struct list_head *entry, *tmp;
3264
3265         iommu = device_to_iommu(pci_domain_nr(pdev->bus), pdev->bus->number,
3266                                 pdev->devfn);
3267         if (!iommu)
3268                 return;
3269
3270         spin_lock_irqsave(&device_domain_lock, flags);
3271         list_for_each_safe(entry, tmp, &domain->devices) {
3272                 info = list_entry(entry, struct device_domain_info, link);
3273                 /* No need to compare PCI domain; it has to be the same */
3274                 if (info->bus == pdev->bus->number &&
3275                     info->devfn == pdev->devfn) {
3276                         list_del(&info->link);
3277                         list_del(&info->global);
3278                         if (info->dev)
3279                                 info->dev->dev.archdata.iommu = NULL;
3280                         spin_unlock_irqrestore(&device_domain_lock, flags);
3281
3282                         iommu_disable_dev_iotlb(info);
3283                         iommu_detach_dev(iommu, info->bus, info->devfn);
3284                         iommu_detach_dependent_devices(iommu, pdev);
3285                         free_devinfo_mem(info);
3286
3287                         spin_lock_irqsave(&device_domain_lock, flags);
3288
3289                         if (found)
3290                                 break;
3291                         else
3292                                 continue;
3293                 }
3294
3295                 /* if there is no other devices under the same iommu
3296                  * owned by this domain, clear this iommu in iommu_bmp
3297                  * update iommu count and coherency
3298                  */
3299                 if (iommu == device_to_iommu(info->segment, info->bus,
3300                                             info->devfn))
3301                         found = 1;
3302         }
3303
3304         if (found == 0) {
3305                 unsigned long tmp_flags;
3306                 spin_lock_irqsave(&domain->iommu_lock, tmp_flags);
3307                 clear_bit(iommu->seq_id, &domain->iommu_bmp);
3308                 domain->iommu_count--;
3309                 domain_update_iommu_cap(domain);
3310                 spin_unlock_irqrestore(&domain->iommu_lock, tmp_flags);
3311         }
3312
3313         spin_unlock_irqrestore(&device_domain_lock, flags);
3314 }
3315
3316 static void vm_domain_remove_all_dev_info(struct dmar_domain *domain)
3317 {
3318         struct device_domain_info *info;
3319         struct intel_iommu *iommu;
3320         unsigned long flags1, flags2;
3321
3322         spin_lock_irqsave(&device_domain_lock, flags1);
3323         while (!list_empty(&domain->devices)) {
3324                 info = list_entry(domain->devices.next,
3325                         struct device_domain_info, link);
3326                 list_del(&info->link);
3327                 list_del(&info->global);
3328                 if (info->dev)
3329                         info->dev->dev.archdata.iommu = NULL;
3330
3331                 spin_unlock_irqrestore(&device_domain_lock, flags1);
3332
3333                 iommu_disable_dev_iotlb(info);
3334                 iommu = device_to_iommu(info->segment, info->bus, info->devfn);
3335                 iommu_detach_dev(iommu, info->bus, info->devfn);
3336                 iommu_detach_dependent_devices(iommu, info->dev);
3337
3338                 /* clear this iommu in iommu_bmp, update iommu count
3339                  * and capabilities
3340                  */
3341                 spin_lock_irqsave(&domain->iommu_lock, flags2);
3342                 if (test_and_clear_bit(iommu->seq_id,
3343                                        &domain->iommu_bmp)) {
3344                         domain->iommu_count--;
3345                         domain_update_iommu_cap(domain);
3346                 }
3347                 spin_unlock_irqrestore(&domain->iommu_lock, flags2);
3348
3349                 free_devinfo_mem(info);
3350                 spin_lock_irqsave(&device_domain_lock, flags1);
3351         }
3352         spin_unlock_irqrestore(&device_domain_lock, flags1);
3353 }
3354
3355 /* domain id for virtual machine, it won't be set in context */
3356 static unsigned long vm_domid;
3357
3358 static int vm_domain_min_agaw(struct dmar_domain *domain)
3359 {
3360         int i;
3361         int min_agaw = domain->agaw;
3362
3363         i = find_first_bit(&domain->iommu_bmp, g_num_of_iommus);
3364         for (; i < g_num_of_iommus; ) {
3365                 if (min_agaw > g_iommus[i]->agaw)
3366                         min_agaw = g_iommus[i]->agaw;
3367
3368                 i = find_next_bit(&domain->iommu_bmp, g_num_of_iommus, i+1);
3369         }
3370
3371         return min_agaw;
3372 }
3373
3374 static struct dmar_domain *iommu_alloc_vm_domain(void)
3375 {
3376         struct dmar_domain *domain;
3377
3378         domain = alloc_domain_mem();
3379         if (!domain)
3380                 return NULL;
3381
3382         domain->id = vm_domid++;
3383         memset(&domain->iommu_bmp, 0, sizeof(unsigned long));
3384         domain->flags = DOMAIN_FLAG_VIRTUAL_MACHINE;
3385
3386         return domain;
3387 }
3388
3389 static int md_domain_init(struct dmar_domain *domain, int guest_width)
3390 {
3391         int adjust_width;
3392
3393         init_iova_domain(&domain->iovad, DMA_32BIT_PFN);
3394         spin_lock_init(&domain->iommu_lock);
3395
3396         domain_reserve_special_ranges(domain);
3397
3398         /* calculate AGAW */
3399         domain->gaw = guest_width;
3400         adjust_width = guestwidth_to_adjustwidth(guest_width);
3401         domain->agaw = width_to_agaw(adjust_width);
3402
3403         INIT_LIST_HEAD(&domain->devices);
3404
3405         domain->iommu_count = 0;
3406         domain->iommu_coherency = 0;
3407         domain->iommu_snooping = 0;
3408         domain->max_addr = 0;
3409
3410         /* always allocate the top pgd */
3411         domain->pgd = (struct dma_pte *)alloc_pgtable_page();
3412         if (!domain->pgd)
3413                 return -ENOMEM;
3414         domain_flush_cache(domain, domain->pgd, PAGE_SIZE);
3415         return 0;
3416 }
3417
3418 static void iommu_free_vm_domain(struct dmar_domain *domain)
3419 {
3420         unsigned long flags;
3421         struct dmar_drhd_unit *drhd;
3422         struct intel_iommu *iommu;
3423         unsigned long i;
3424         unsigned long ndomains;
3425
3426         for_each_drhd_unit(drhd) {
3427                 if (drhd->ignored)
3428                         continue;
3429                 iommu = drhd->iommu;
3430
3431                 ndomains = cap_ndoms(iommu->cap);
3432                 i = find_first_bit(iommu->domain_ids, ndomains);
3433                 for (; i < ndomains; ) {
3434                         if (iommu->domains[i] == domain) {
3435                                 spin_lock_irqsave(&iommu->lock, flags);
3436                                 clear_bit(i, iommu->domain_ids);
3437                                 iommu->domains[i] = NULL;
3438                                 spin_unlock_irqrestore(&iommu->lock, flags);
3439                                 break;
3440                         }
3441                         i = find_next_bit(iommu->domain_ids, ndomains, i+1);
3442                 }
3443         }
3444 }
3445
3446 static void vm_domain_exit(struct dmar_domain *domain)
3447 {
3448         /* Domain 0 is reserved, so dont process it */
3449         if (!domain)
3450                 return;
3451
3452         vm_domain_remove_all_dev_info(domain);
3453         /* destroy iovas */
3454         put_iova_domain(&domain->iovad);
3455
3456         /* clear ptes */
3457         dma_pte_clear_range(domain, 0, DOMAIN_MAX_PFN(domain->gaw));
3458
3459         /* free page tables */
3460         dma_pte_free_pagetable(domain, 0, DOMAIN_MAX_PFN(domain->gaw));
3461
3462         iommu_free_vm_domain(domain);
3463         free_domain_mem(domain);
3464 }
3465
3466 static int intel_iommu_domain_init(struct iommu_domain *domain)
3467 {
3468         struct dmar_domain *dmar_domain;
3469
3470         dmar_domain = iommu_alloc_vm_domain();
3471         if (!dmar_domain) {
3472                 printk(KERN_ERR
3473                         "intel_iommu_domain_init: dmar_domain == NULL\n");
3474                 return -ENOMEM;
3475         }
3476         if (md_domain_init(dmar_domain, DEFAULT_DOMAIN_ADDRESS_WIDTH)) {
3477                 printk(KERN_ERR
3478                         "intel_iommu_domain_init() failed\n");
3479                 vm_domain_exit(dmar_domain);
3480                 return -ENOMEM;
3481         }
3482         domain->priv = dmar_domain;
3483
3484         return 0;
3485 }
3486
3487 static void intel_iommu_domain_destroy(struct iommu_domain *domain)
3488 {
3489         struct dmar_domain *dmar_domain = domain->priv;
3490
3491         domain->priv = NULL;
3492         vm_domain_exit(dmar_domain);
3493 }
3494
3495 static int intel_iommu_attach_device(struct iommu_domain *domain,
3496                                      struct device *dev)
3497 {
3498         struct dmar_domain *dmar_domain = domain->priv;
3499         struct pci_dev *pdev = to_pci_dev(dev);
3500         struct intel_iommu *iommu;
3501         int addr_width;
3502         u64 end;
3503
3504         /* normally pdev is not mapped */
3505         if (unlikely(domain_context_mapped(pdev))) {
3506                 struct dmar_domain *old_domain;
3507
3508                 old_domain = find_domain(pdev);
3509                 if (old_domain) {
3510                         if (dmar_domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE ||
3511                             dmar_domain->flags & DOMAIN_FLAG_STATIC_IDENTITY)
3512                                 domain_remove_one_dev_info(old_domain, pdev);
3513                         else
3514                                 domain_remove_dev_info(old_domain);
3515                 }
3516         }
3517
3518         iommu = device_to_iommu(pci_domain_nr(pdev->bus), pdev->bus->number,
3519                                 pdev->devfn);
3520         if (!iommu)
3521                 return -ENODEV;
3522
3523         /* check if this iommu agaw is sufficient for max mapped address */
3524         addr_width = agaw_to_width(iommu->agaw);
3525         end = DOMAIN_MAX_ADDR(addr_width);
3526         end = end & VTD_PAGE_MASK;
3527         if (end < dmar_domain->max_addr) {
3528                 printk(KERN_ERR "%s: iommu agaw (%d) is not "
3529                        "sufficient for the mapped address (%llx)\n",
3530                        __func__, iommu->agaw, dmar_domain->max_addr);
3531                 return -EFAULT;
3532         }
3533
3534         return domain_add_dev_info(dmar_domain, pdev, CONTEXT_TT_MULTI_LEVEL);
3535 }
3536
3537 static void intel_iommu_detach_device(struct iommu_domain *domain,
3538                                       struct device *dev)
3539 {
3540         struct dmar_domain *dmar_domain = domain->priv;
3541         struct pci_dev *pdev = to_pci_dev(dev);
3542
3543         domain_remove_one_dev_info(dmar_domain, pdev);
3544 }
3545
3546 static int intel_iommu_map_range(struct iommu_domain *domain,
3547                                  unsigned long iova, phys_addr_t hpa,
3548                                  size_t size, int iommu_prot)
3549 {
3550         struct dmar_domain *dmar_domain = domain->priv;
3551         u64 max_addr;
3552         int addr_width;
3553         int prot = 0;
3554         int ret;
3555
3556         if (iommu_prot & IOMMU_READ)
3557                 prot |= DMA_PTE_READ;
3558         if (iommu_prot & IOMMU_WRITE)
3559                 prot |= DMA_PTE_WRITE;
3560         if ((iommu_prot & IOMMU_CACHE) && dmar_domain->iommu_snooping)
3561                 prot |= DMA_PTE_SNP;
3562
3563         max_addr = iova + size;
3564         if (dmar_domain->max_addr < max_addr) {
3565                 int min_agaw;
3566                 u64 end;
3567
3568                 /* check if minimum agaw is sufficient for mapped address */
3569                 min_agaw = vm_domain_min_agaw(dmar_domain);
3570                 addr_width = agaw_to_width(min_agaw);
3571                 end = DOMAIN_MAX_ADDR(addr_width);
3572                 end = end & VTD_PAGE_MASK;
3573                 if (end < max_addr) {
3574                         printk(KERN_ERR "%s: iommu agaw (%d) is not "
3575                                "sufficient for the mapped address (%llx)\n",
3576                                __func__, min_agaw, max_addr);
3577                         return -EFAULT;
3578                 }
3579                 dmar_domain->max_addr = max_addr;
3580         }
3581         /* Round up size to next multiple of PAGE_SIZE, if it and
3582            the low bits of hpa would take us onto the next page */
3583         size = aligned_nrpages(hpa, size);
3584         ret = domain_pfn_mapping(dmar_domain, iova >> VTD_PAGE_SHIFT,
3585                                  hpa >> VTD_PAGE_SHIFT, size, prot);
3586         return ret;
3587 }
3588
3589 static void intel_iommu_unmap_range(struct iommu_domain *domain,
3590                                     unsigned long iova, size_t size)
3591 {
3592         struct dmar_domain *dmar_domain = domain->priv;
3593
3594         if (!size)
3595                 return;
3596
3597         dma_pte_clear_range(dmar_domain, iova >> VTD_PAGE_SHIFT,
3598                             (iova + size - 1) >> VTD_PAGE_SHIFT);
3599
3600         if (dmar_domain->max_addr == iova + size)
3601                 dmar_domain->max_addr = iova;
3602 }
3603
3604 static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain,
3605                                             unsigned long iova)
3606 {
3607         struct dmar_domain *dmar_domain = domain->priv;
3608         struct dma_pte *pte;
3609         u64 phys = 0;
3610
3611         pte = pfn_to_dma_pte(dmar_domain, iova >> VTD_PAGE_SHIFT);
3612         if (pte)
3613                 phys = dma_pte_addr(pte);
3614
3615         return phys;
3616 }
3617
3618 static int intel_iommu_domain_has_cap(struct iommu_domain *domain,
3619                                       unsigned long cap)
3620 {
3621         struct dmar_domain *dmar_domain = domain->priv;
3622
3623         if (cap == IOMMU_CAP_CACHE_COHERENCY)
3624                 return dmar_domain->iommu_snooping;
3625
3626         return 0;
3627 }
3628
3629 static struct iommu_ops intel_iommu_ops = {
3630         .domain_init    = intel_iommu_domain_init,
3631         .domain_destroy = intel_iommu_domain_destroy,
3632         .attach_dev     = intel_iommu_attach_device,
3633         .detach_dev     = intel_iommu_detach_device,
3634         .map            = intel_iommu_map_range,
3635         .unmap          = intel_iommu_unmap_range,
3636         .iova_to_phys   = intel_iommu_iova_to_phys,
3637         .domain_has_cap = intel_iommu_domain_has_cap,
3638 };
3639
3640 static void __devinit quirk_iommu_rwbf(struct pci_dev *dev)
3641 {
3642         /*
3643          * Mobile 4 Series Chipset neglects to set RWBF capability,
3644          * but needs it:
3645          */
3646         printk(KERN_INFO "DMAR: Forcing write-buffer flush capability\n");
3647         rwbf_quirk = 1;
3648 }
3649
3650 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2a40, quirk_iommu_rwbf);