X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=drivers%2Fpci%2Fintel-iommu.c;h=3778ab149baf3394fd9fa73356fedf3b17c4f123;hb=dbb9fd8630e95b6155aff658a2b5f80e95ca2bc6;hp=3dfecb20d5e7949953e7fefa2796af4b48bef88f;hpb=a3aaebc4b006e9405cddd553d8a75a531e6f01a8;p=deliverable%2Flinux.git

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 3dfecb20d5e7..3778ab149baf 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -61,6 +61,8 @@
 /* global iommu list, set NULL for ignored DMAR units */
 static struct intel_iommu **g_iommus;
 
+static int rwbf_quirk;
+
 /*
  * 0: Present
  * 1-11: Reserved
@@ -229,6 +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 */
@@ -268,7 +271,12 @@ static long list_size;
 
 static void domain_remove_dev_info(struct dmar_domain *domain);
 
-int dmar_disabled;
+#ifdef CONFIG_DMAR_DEFAULT_ON
+int dmar_disabled = 0;
+#else
+int dmar_disabled = 1;
+#endif /*CONFIG_DMAR_DEFAULT_ON*/
+
 static int __initdata dmar_map_gfx = 1;
 static int dmar_forcedac;
 static int intel_iommu_strict;
@@ -284,9 +292,12 @@ static int __init intel_iommu_setup(char *str)
 	if (!str)
 		return -EINVAL;
 	while (*str) {
-		if (!strncmp(str, "off", 3)) {
+		if (!strncmp(str, "on", 2)) {
+			dmar_disabled = 0;
+			printk(KERN_INFO "Intel-IOMMU: enabled\n");
+		} else if (!strncmp(str, "off", 3)) {
 			dmar_disabled = 1;
-			printk(KERN_INFO"Intel-IOMMU: disabled\n");
+			printk(KERN_INFO "Intel-IOMMU: disabled\n");
 		} else if (!strncmp(str, "igfx_off", 8)) {
 			dmar_map_gfx = 0;
 			printk(KERN_INFO
@@ -411,7 +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;
@@ -428,6 +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;
@@ -777,7 +810,7 @@ static void iommu_flush_write_buffer(struct intel_iommu *iommu)
 	u32 val;
 	unsigned long flag;
 
-	if (!cap_rwbf(iommu->cap))
+	if (!rwbf_quirk && !cap_rwbf(iommu->cap))
 		return;
 	val = iommu->gcmd | DMA_GCMD_WBF;
 
@@ -1419,6 +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 */
@@ -1547,7 +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;
@@ -2810,7 +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);
 	}
 
@@ -2838,13 +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);
 
@@ -3120,6 +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,
@@ -3128,4 +3177,17 @@ 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)
+{
+	/*
+	 * Mobile 4 Series Chipset neglects to set RWBF capability,
+	 * but needs it:
+	 */
+	printk(KERN_INFO "DMAR: Forcing write-buffer flush capability\n");
+	rwbf_quirk = 1;
+}
+
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2a40, quirk_iommu_rwbf);