7 files changed, 127 insertions, 22 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 748e50a1a152..3f27e5c0c9c9 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1837,8 +1837,8 @@ config PCI_MMCONFIG
 
 config DMAR
         bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
-        depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL
-        ---help---
+        depends on PCI_MSI && ACPI && EXPERIMENTAL
+        help
           DMA remapping (DMAR) devices support enables independent address
           translations for Direct Memory Access (DMA) from devices.
           These DMA remapping devices are reported via ACPI tables
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index c5962fe3796f..a97db99dad52 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -1928,6 +1928,12 @@ static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,
         return paddr;
 }
 
+static int amd_iommu_domain_has_cap(struct iommu_domain *domain,
+                                    unsigned long cap)
+{
+        return 0;
+}
+
 static struct iommu_ops amd_iommu_ops = {
         .domain_init = amd_iommu_domain_init,
         .domain_destroy = amd_iommu_domain_destroy,
@@ -1936,5 +1942,6 @@ static struct iommu_ops amd_iommu_ops = {
         .map = amd_iommu_map_range,
         .unmap = amd_iommu_unmap_range,
         .iova_to_phys = amd_iommu_iova_to_phys,
+        .domain_has_cap = amd_iommu_domain_has_cap,
 };
 
diff --git a/drivers/base/iommu.c b/drivers/base/iommu.c
index c2d1eed90376..9f0e672f4be8 100644
--- a/drivers/base/iommu.c
+++ b/drivers/base/iommu.c
@@ -98,3 +98,10 @@ phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
         return iommu_ops->iova_to_phys(domain, iova);
 }
 EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
+
+int iommu_domain_has_cap(struct iommu_domain *domain,
+                         unsigned long cap)
+{
+        return iommu_ops->domain_has_cap(domain, cap);
+}
+EXPORT_SYMBOL_GPL(iommu_domain_has_cap);
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 9dbd5066acaf..23e56a564e05 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -164,7 +164,8 @@ static inline void context_clear_entry(struct context_entry *context)
  * 1: writable
  * 2-6: reserved
  * 7: super page
- * 8-11: available
+ * 8-10: available
+ * 11: snoop behavior
  * 12-63: Host physcial address
  */
 struct dma_pte {
@@ -186,6 +187,11 @@ static inline void dma_set_pte_writable(struct dma_pte *pte)
         pte->val |= DMA_PTE_WRITE;
 }
 
+static inline void dma_set_pte_snp(struct dma_pte *pte)
+{
+        pte->val |= DMA_PTE_SNP;
+}
+
 static inline void dma_set_pte_prot(struct dma_pte *pte, unsigned long prot)
 {
         pte->val = (pte->val & ~3) | (prot & 3);
@@ -231,6 +237,7 @@ struct dmar_domain {
         int             flags;          /* flags to find out type of domain */
 
         int             iommu_coherency;/* indicate coherency of iommu access */
+        int             iommu_snooping; /* indicate snooping control feature*/
         int             iommu_count;    /* reference count of iommu */
         spinlock_t      iommu_lock;     /* protect iommu set in domain */
         u64             max_addr;       /* maximum mapped address */
@@ -421,7 +428,6 @@ static struct intel_iommu *domain_get_iommu(struct dmar_domain *domain)
         return g_iommus[iommu_id];
 }
 
-/* "Coherency" capability may be different across iommus */
 static void domain_update_iommu_coherency(struct dmar_domain *domain)
 {
         int i;
@@ -438,6 +444,29 @@ static void domain_update_iommu_coherency(struct dmar_domain *domain)
         }
 }
 
+static void domain_update_iommu_snooping(struct dmar_domain *domain)
+{
+        int i;
+
+        domain->iommu_snooping = 1;
+
+        i = find_first_bit(&domain->iommu_bmp, g_num_of_iommus);
+        for (; i < g_num_of_iommus; ) {
+                if (!ecap_sc_support(g_iommus[i]->ecap)) {
+                        domain->iommu_snooping = 0;
+                        break;
+                }
+                i = find_next_bit(&domain->iommu_bmp, g_num_of_iommus, i+1);
+        }
+}
+
+/* Some capabilities may be different across iommus */
+static void domain_update_iommu_cap(struct dmar_domain *domain)
+{
+        domain_update_iommu_coherency(domain);
+        domain_update_iommu_snooping(domain);
+}
+
 static struct intel_iommu *device_to_iommu(u8 bus, u8 devfn)
 {
         struct dmar_drhd_unit *drhd = NULL;
@@ -689,15 +718,17 @@ static void dma_pte_clear_one(struct dmar_domain *domain, u64 addr)
 static void dma_pte_clear_range(struct dmar_domain *domain, u64 start, u64 end)
 {
         int addr_width = agaw_to_width(domain->agaw);
+        int npages;
 
         start &= (((u64)1) << addr_width) - 1;
         end &= (((u64)1) << addr_width) - 1;
         /* in case it's partial page */
         start = PAGE_ALIGN(start);
         end &= PAGE_MASK;
+        npages = (end - start) / VTD_PAGE_SIZE;
 
         /* we don't need lock here, nobody else touches the iova range */
-        while (start < end) {
+        while (npages--) {
                 dma_pte_clear_one(domain, start);
                 start += VTD_PAGE_SIZE;
         }
@@ -1241,6 +1272,11 @@ static int domain_init(struct dmar_domain *domain, int guest_width)
         else
                 domain->iommu_coherency = 0;
 
+        if (ecap_sc_support(iommu->ecap))
+                domain->iommu_snooping = 1;
+        else
+                domain->iommu_snooping = 0;
+
         domain->iommu_count = 1;
 
         /* always allocate the top pgd */
@@ -1369,7 +1405,7 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
         spin_lock_irqsave(&domain->iommu_lock, flags);
         if (!test_and_set_bit(iommu->seq_id, &domain->iommu_bmp)) {
                 domain->iommu_count++;
-                domain_update_iommu_coherency(domain);
+                domain_update_iommu_cap(domain);
         }
         spin_unlock_irqrestore(&domain->iommu_lock, flags);
         return 0;
@@ -1469,6 +1505,8 @@ domain_page_mapping(struct dmar_domain *domain, dma_addr_t iova,
                 BUG_ON(dma_pte_addr(pte));
                 dma_set_pte_addr(pte, start_pfn << VTD_PAGE_SHIFT);
                 dma_set_pte_prot(pte, prot);
+                if (prot & DMA_PTE_SNP)
+                        dma_set_pte_snp(pte);
                 domain_flush_cache(domain, pte, sizeof(*pte));
                 start_pfn++;
                 index++;
@@ -2119,7 +2157,7 @@ static dma_addr_t __intel_map_single(struct device *hwdev, phys_addr_t paddr,
 error:
         if (iova)
                 __free_iova(&domain->iovad, iova);
-        printk(KERN_ERR"Device %s request: %lx@%llx dir %d --- failed\n",
+        printk(KERN_ERR"Device %s request: %zx@%llx dir %d --- failed\n",
                 pci_name(pdev), size, (unsigned long long)paddr, dir);
         return 0;
 }
@@ -2218,7 +2256,7 @@ static void intel_unmap_page(struct device *dev, dma_addr_t dev_addr,
         start_addr = iova->pfn_lo << PAGE_SHIFT;
         size = aligned_size((u64)dev_addr, size);
 
-        pr_debug("Device %s unmapping: %lx@%llx\n",
+        pr_debug("Device %s unmapping: %zx@%llx\n",
                 pci_name(pdev), size, (unsigned long long)start_addr);
 
         /*  clear the whole page */
@@ -2282,8 +2320,6 @@ static void intel_free_coherent(struct device *hwdev, size_t size, void *vaddr,
         free_pages((unsigned long)vaddr, order);
 }
 
-#define SG_ENT_VIRT_ADDRESS(sg) (sg_virt((sg)))
-
 static void intel_unmap_sg(struct device *hwdev, struct scatterlist *sglist,
                            int nelems, enum dma_data_direction dir,
                            struct dma_attrs *attrs)
@@ -2294,7 +2330,7 @@ static void intel_unmap_sg(struct device *hwdev, struct scatterlist *sglist,
         unsigned long start_addr;
         struct iova *iova;
         size_t size = 0;
-        void *addr;
+        phys_addr_t addr;
         struct scatterlist *sg;
         struct intel_iommu *iommu;
 
@@ -2310,7 +2346,7 @@ static void intel_unmap_sg(struct device *hwdev, struct scatterlist *sglist,
         if (!iova)
                 return;
         for_each_sg(sglist, sg, nelems, i) {
-                addr = SG_ENT_VIRT_ADDRESS(sg);
+                addr = page_to_phys(sg_page(sg)) + sg->offset;
                 size += aligned_size((u64)addr, sg->length);
         }
 
@@ -2337,7 +2373,7 @@ static int intel_nontranslate_map_sg(struct device *hddev,
 
         for_each_sg(sglist, sg, nelems, i) {
                 BUG_ON(!sg_page(sg));
-                sg->dma_address = virt_to_bus(SG_ENT_VIRT_ADDRESS(sg));
+                sg->dma_address = page_to_phys(sg_page(sg)) + sg->offset;
                 sg->dma_length = sg->length;
         }
         return nelems;
@@ -2346,7 +2382,7 @@ static int intel_nontranslate_map_sg(struct device *hddev,
 static int intel_map_sg(struct device *hwdev, struct scatterlist *sglist, int nelems,
                         enum dma_data_direction dir, struct dma_attrs *attrs)
 {
-        void *addr;
+        phys_addr_t addr;
         int i;
         struct pci_dev *pdev = to_pci_dev(hwdev);
         struct dmar_domain *domain;
@@ -2370,8 +2406,7 @@ static int intel_map_sg(struct device *hwdev, struct scatterlist *sglist, int ne
         iommu = domain_get_iommu(domain);
 
         for_each_sg(sglist, sg, nelems, i) {
-                addr = SG_ENT_VIRT_ADDRESS(sg);
-                addr = (void *)virt_to_phys(addr);
+                addr = page_to_phys(sg_page(sg)) + sg->offset;
                 size += aligned_size((u64)addr, sg->length);
         }
 
@@ -2394,8 +2429,7 @@ static int intel_map_sg(struct device *hwdev, struct scatterlist *sglist, int ne
         start_addr = iova->pfn_lo << PAGE_SHIFT;
         offset = 0;
         for_each_sg(sglist, sg, nelems, i) {
-                addr = SG_ENT_VIRT_ADDRESS(sg);
-                addr = (void *)virt_to_phys(addr);
+                addr = page_to_phys(sg_page(sg)) + sg->offset;
                 size = aligned_size((u64)addr, sg->length);
                 ret = domain_page_mapping(domain, start_addr + offset,
                         ((u64)addr) & PAGE_MASK,
@@ -2628,6 +2662,33 @@ static int vm_domain_add_dev_info(struct dmar_domain *domain,
         return 0;
 }
 
+static void iommu_detach_dependent_devices(struct intel_iommu *iommu,
+                                           struct pci_dev *pdev)
+{
+        struct pci_dev *tmp, *parent;
+
+        if (!iommu || !pdev)
+                return;
+
+        /* dependent device detach */
+        tmp = pci_find_upstream_pcie_bridge(pdev);
+        /* Secondary interface's bus number and devfn 0 */
+        if (tmp) {
+                parent = pdev->bus->self;
+                while (parent != tmp) {
+                        iommu_detach_dev(iommu, parent->bus->number,
+                                parent->devfn);
+                        parent = parent->bus->self;
+                }
+                if (tmp->is_pcie) /* this is a PCIE-to-PCI bridge */
+                        iommu_detach_dev(iommu,
+                                tmp->subordinate->number, 0);
+                else /* this is a legacy PCI bridge */
+                        iommu_detach_dev(iommu,
+                                tmp->bus->number, tmp->devfn);
+        }
+}
+
 static void vm_domain_remove_one_dev_info(struct dmar_domain *domain,
                                           struct pci_dev *pdev)
 {
@@ -2653,6 +2714,7 @@ static void vm_domain_remove_one_dev_info(struct dmar_domain *domain,
                         spin_unlock_irqrestore(&device_domain_lock, flags);
 
                         iommu_detach_dev(iommu, info->bus, info->devfn);
+                        iommu_detach_dependent_devices(iommu, pdev);
                         free_devinfo_mem(info);
 
                         spin_lock_irqsave(&device_domain_lock, flags);
@@ -2676,7 +2738,7 @@ static void vm_domain_remove_one_dev_info(struct dmar_domain *domain,
                 spin_lock_irqsave(&domain->iommu_lock, tmp_flags);
                 clear_bit(iommu->seq_id, &domain->iommu_bmp);
                 domain->iommu_count--;
-                domain_update_iommu_coherency(domain);
+                domain_update_iommu_cap(domain);
                 spin_unlock_irqrestore(&domain->iommu_lock, tmp_flags);
         }
 
@@ -2702,15 +2764,16 @@ static void vm_domain_remove_all_dev_info(struct dmar_domain *domain)
 
                 iommu = device_to_iommu(info->bus, info->devfn);
                 iommu_detach_dev(iommu, info->bus, info->devfn);
+                iommu_detach_dependent_devices(iommu, info->dev);
 
                 /* clear this iommu in iommu_bmp, update iommu count
-                 * and coherency
+                 * and capabilities
                  */
                 spin_lock_irqsave(&domain->iommu_lock, flags2);
                 if (test_and_clear_bit(iommu->seq_id,
                                        &domain->iommu_bmp)) {
                         domain->iommu_count--;
-                        domain_update_iommu_coherency(domain);
+                        domain_update_iommu_cap(domain);
                 }
                 spin_unlock_irqrestore(&domain->iommu_lock, flags2);
 
@@ -2933,6 +2996,8 @@ static int intel_iommu_map_range(struct iommu_domain *domain,
                 prot |= DMA_PTE_READ;
         if (iommu_prot & IOMMU_WRITE)
                 prot |= DMA_PTE_WRITE;
+        if ((iommu_prot & IOMMU_CACHE) && dmar_domain->iommu_snooping)
+                prot |= DMA_PTE_SNP;
 
         max_addr = (iova & VTD_PAGE_MASK) + VTD_PAGE_ALIGN(size);
         if (dmar_domain->max_addr < max_addr) {
@@ -2986,6 +3051,17 @@ static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain,
         return phys;
 }
 
+static int intel_iommu_domain_has_cap(struct iommu_domain *domain,
+                                      unsigned long cap)
+{
+        struct dmar_domain *dmar_domain = domain->priv;
+
+        if (cap == IOMMU_CAP_CACHE_COHERENCY)
+                return dmar_domain->iommu_snooping;
+
+        return 0;
+}
+
 static struct iommu_ops intel_iommu_ops = {
         .domain_init    = intel_iommu_domain_init,
         .domain_destroy = intel_iommu_domain_destroy,
@@ -2994,6 +3070,7 @@ static struct iommu_ops intel_iommu_ops = {
         .map            = intel_iommu_map_range,
         .unmap          = intel_iommu_unmap_range,
         .iova_to_phys   = intel_iommu_iova_to_phys,
+        .domain_has_cap = intel_iommu_domain_has_cap,
 };
 
 static void __devinit quirk_iommu_rwbf(struct pci_dev *dev)
diff --git a/include/linux/dma_remapping.h b/include/linux/dma_remapping.h
index af1dab41674b..1a455f1f86d7 100644
--- a/include/linux/dma_remapping.h
+++ b/include/linux/dma_remapping.h
@@ -11,6 +11,7 @@
 
 #define DMA_PTE_READ (1)
 #define DMA_PTE_WRITE (2)
+#define DMA_PTE_SNP (1 << 11)
 
 struct intel_iommu;
 struct dmar_domain;
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index 1d6c71d96ede..77214ead1a36 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -123,7 +123,7 @@ static inline void dmar_writeq(void __iomem *addr, u64 val)
 #define ecap_eim_support(e)     ((e >> 4) & 0x1)
 #define ecap_ir_support(e)      ((e >> 3) & 0x1)
 #define ecap_max_handle_mask(e) ((e >> 20) & 0xf)
-
+#define ecap_sc_support(e)      ((e >> 7) & 0x1) /* Snooping Control */
 
 /* IOTLB_REG */
 #define DMA_TLB_FLUSH_GRANU_OFFSET  60
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 8a7bfb1b6ca0..3af4ffd591b9 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -21,6 +21,7 @@
 
 #define IOMMU_READ      (1)
 #define IOMMU_WRITE     (2)
+#define IOMMU_CACHE     (4) /* DMA cache coherency */
 
 struct device;
 
@@ -28,6 +29,8 @@ struct iommu_domain {
         void *priv;
 };
 
+#define IOMMU_CAP_CACHE_COHERENCY       0x1
+
 struct iommu_ops {
         int (*domain_init)(struct iommu_domain *domain);
         void (*domain_destroy)(struct iommu_domain *domain);
@@ -39,6 +42,8 @@ struct iommu_ops {
                       size_t size);
         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
                                     unsigned long iova);
+        int (*domain_has_cap)(struct iommu_domain *domain,
+                              unsigned long cap);
 };
 
 #ifdef CONFIG_IOMMU_API
@@ -57,6 +62,8 @@ extern void iommu_unmap_range(struct iommu_domain *domain, unsigned long iova,
                               size_t size);
 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
                                       unsigned long iova);
+extern int iommu_domain_has_cap(struct iommu_domain *domain,
+                                unsigned long cap);
 
 #else /* CONFIG_IOMMU_API */
 
@@ -107,6 +114,12 @@ static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
         return 0;
 }
 
+static inline int domain_has_cap(struct iommu_domain *domain,
+                                 unsigned long cap)
+{
+        return 0;
+}
+
 #endif /* CONFIG_IOMMU_API */
 
 #endif /* __LINUX_IOMMU_H */