iommu: Add domain_has_cap iommu_ops

[deliverable/linux.git] / drivers / pci / intel-iommu.c

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index f3f686581a9026685dc3e6c994b00e88ed88486c..3778ab149baf3394fd9fa73356fedf3b17c4f123 100644 (file)
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -231,6 +231,7 @@ 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 +422,6 @@ 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 +438,29 @@ 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;
@@ -1429,6 +1452,11 @@ 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 */
@@ -1557,7 +1585,7 @@ 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;
@@ -2820,7 +2848,7 @@ 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);
        }
 
@@ -2848,13 +2876,13 @@ static void vm_domain_remove_all_dev_info(struct dmar_domain *domain)
                iommu_detach_dev(iommu, info->bus, info->devfn);
 
                /* 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);
 
@@ -3130,6 +3158,17 @@ 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,
@@ -3138,6 +3177,7 @@ 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)