intel-iommu: Handle PCI domains appropriately.

We were comparing {bus,devfn} and assuming that a match meant it was the
same device. It doesn't -- the same {bus,devfn} can exist in
multiple PCI domains. Include domain number in device identification
(and call it 'segment' in most places, because there's already a lot of
references to 'domain' which means something else, and this code is
infected with ACPI thinking already).

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

drivers/pci/dmar.c

@@ -180,6 +180,7 @@ dmar_parse_one_drhd(struct acpi_dmar_header *header)
 	dmaru->hdr = header;
 	drhd = (struct acpi_dmar_hardware_unit *)header;
 	dmaru->reg_base_addr = drhd->address;
+	dmaru->segment = drhd->segment;
 	dmaru->include_all = drhd->flags & 0x1; /* BIT0: INCLUDE_ALL */
 
 	ret = alloc_iommu(dmaru);

drivers/pci/intel-iommu.c

@@ -248,7 +248,8 @@ struct dmar_domain {
 struct device_domain_info {
 	struct list_head link;	/* link to domain siblings */
 	struct list_head global; /* link to global list */
-	u8 bus;			/* PCI bus numer */
+	int segment;		/* PCI domain */
+	u8 bus;			/* PCI bus number */
 	u8 devfn;		/* PCI devfn number */
 	struct pci_dev *dev; /* it's NULL for PCIE-to-PCI bridge */
 	struct dmar_domain *domain; /* pointer to domain */
@@ -468,14 +469,16 @@ static void domain_update_iommu_cap(struct dmar_domain *domain)
 	domain_update_iommu_snooping(domain);
 }
 
-static struct intel_iommu *device_to_iommu(u8 bus, u8 devfn)
+static struct intel_iommu *device_to_iommu(int segment, u8 bus, u8 devfn)
 {
 	struct dmar_drhd_unit *drhd = NULL;
 	int i;
 
 	for_each_drhd_unit(drhd) {
 		if (drhd->ignored)
 			continue;
+		if (segment != drhd->segment)
+			continue;
 
 		for (i = 0; i < drhd->devices_cnt; i++) {
 			if (drhd->devices[i] &&
@@ -1318,7 +1321,7 @@ static void domain_exit(struct dmar_domain *domain)
 }
 
 static int domain_context_mapping_one(struct dmar_domain *domain,
-		u8 bus, u8 devfn)
+				      int segment, u8 bus, u8 devfn)
 {
 	struct context_entry *context;
 	unsigned long flags;
@@ -1333,7 +1336,7 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
 		bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
 	BUG_ON(!domain->pgd);
 
-	iommu = device_to_iommu(bus, devfn);
+	iommu = device_to_iommu(segment, bus, devfn);
 	if (!iommu)
 		return -ENODEV;
 
@@ -1423,8 +1426,8 @@ domain_context_mapping(struct dmar_domain *domain, struct pci_dev *pdev)
 	int ret;
 	struct pci_dev *tmp, *parent;
 
-	ret = domain_context_mapping_one(domain, pdev->bus->number,
-		pdev->devfn);
+	ret = domain_context_mapping_one(domain, pci_domain_nr(pdev->bus),
+					 pdev->bus->number, pdev->devfn);
 	if (ret)
 		return ret;
 
@@ -1435,18 +1438,23 @@ domain_context_mapping(struct dmar_domain *domain, struct pci_dev *pdev)
 	/* Secondary interface's bus number and devfn 0 */
 	parent = pdev->bus->self;
 	while (parent != tmp) {
-		ret = domain_context_mapping_one(domain, parent->bus->number,
-			parent->devfn);
+		ret = domain_context_mapping_one(domain,
+						 pci_domain_nr(parent->bus),
+						 parent->bus->number,
+						 parent->devfn);
 		if (ret)
 			return ret;
 		parent = parent->bus->self;
 	}
 	if (tmp->is_pcie) /* this is a PCIE-to-PCI bridge */
 		return domain_context_mapping_one(domain,
-			tmp->subordinate->number, 0);
+					pci_domain_nr(tmp->subordinate),
+					tmp->subordinate->number, 0);
 	else /* this is a legacy PCI bridge */
 		return domain_context_mapping_one(domain,
-			tmp->bus->number, tmp->devfn);
+						  pci_domain_nr(tmp->bus),
+						  tmp->bus->number,
+						  tmp->devfn);
 }
 
 static int domain_context_mapped(struct pci_dev *pdev)
@@ -1455,12 +1463,12 @@ static int domain_context_mapped(struct pci_dev *pdev)
 	struct pci_dev *tmp, *parent;
 	struct intel_iommu *iommu;
 
-	iommu = device_to_iommu(pdev->bus->number, pdev->devfn);
+	iommu = device_to_iommu(pci_domain_nr(pdev->bus), pdev->bus->number,
+				pdev->devfn);
 	if (!iommu)
 		return -ENODEV;
 
-	ret = device_context_mapped(iommu,
-		pdev->bus->number, pdev->devfn);
+	ret = device_context_mapped(iommu, pdev->bus->number, pdev->devfn);
 	if (!ret)
 		return ret;
 	/* dependent device mapping */
@@ -1471,17 +1479,17 @@ static int domain_context_mapped(struct pci_dev *pdev)
 	parent = pdev->bus->self;
 	while (parent != tmp) {
 		ret = device_context_mapped(iommu, parent->bus->number,
-			parent->devfn);
+					    parent->devfn);
 		if (!ret)
 			return ret;
 		parent = parent->bus->self;
 	}
 	if (tmp->is_pcie)
-		return device_context_mapped(iommu,
-			tmp->subordinate->number, 0);
+		return device_context_mapped(iommu, tmp->subordinate->number,
+					     0);
 	else
-		return device_context_mapped(iommu,
-			tmp->bus->number, tmp->devfn);
+		return device_context_mapped(iommu, tmp->bus->number,
+					     tmp->devfn);
 }
 
 static int
@@ -1548,7 +1556,7 @@ static void domain_remove_dev_info(struct dmar_domain *domain)
 			info->dev->dev.archdata.iommu = NULL;
 		spin_unlock_irqrestore(&device_domain_lock, flags);
 
-		iommu = device_to_iommu(info->bus, info->devfn);
+		iommu = device_to_iommu(info->segment, info->bus, info->devfn);
 		iommu_detach_dev(iommu, info->bus, info->devfn);
 		free_devinfo_mem(info);
 
@@ -1583,11 +1591,14 @@ static struct dmar_domain *get_domain_for_dev(struct pci_dev *pdev, int gaw)
 	struct pci_dev *dev_tmp;
 	unsigned long flags;
 	int bus = 0, devfn = 0;
+	int segment;
 
 	domain = find_domain(pdev);
 	if (domain)
 		return domain;
 
+	segment = pci_domain_nr(pdev->bus);
+
 	dev_tmp = pci_find_upstream_pcie_bridge(pdev);
 	if (dev_tmp) {
 		if (dev_tmp->is_pcie) {
@@ -1599,7 +1610,8 @@ static struct dmar_domain *get_domain_for_dev(struct pci_dev *pdev, int gaw)
 		}
 		spin_lock_irqsave(&device_domain_lock, flags);
 		list_for_each_entry(info, &device_domain_list, global) {
-			if (info->bus == bus && info->devfn == devfn) {
+			if (info->segment == segment &&
+			    info->bus == bus && info->devfn == devfn) {
 				found = info->domain;
 				break;
 			}
@@ -1637,6 +1649,7 @@ static struct dmar_domain *get_domain_for_dev(struct pci_dev *pdev, int gaw)
 			domain_exit(domain);
 			goto error;
 		}
+		info->segment = segment;
 		info->bus = bus;
 		info->devfn = devfn;
 		info->dev = NULL;
@@ -1648,7 +1661,8 @@ static struct dmar_domain *get_domain_for_dev(struct pci_dev *pdev, int gaw)
 		found = NULL;
 		spin_lock_irqsave(&device_domain_lock, flags);
 		list_for_each_entry(tmp, &device_domain_list, global) {
-			if (tmp->bus == bus && tmp->devfn == devfn) {
+			if (tmp->segment == segment &&
+			    tmp->bus == bus && tmp->devfn == devfn) {
 				found = tmp->domain;
 				break;
 			}
@@ -1668,6 +1682,7 @@ static struct dmar_domain *get_domain_for_dev(struct pci_dev *pdev, int gaw)
 	info = alloc_devinfo_mem();
 	if (!info)
 		goto error;
+	info->segment = segment;
 	info->bus = pdev->bus->number;
 	info->devfn = pdev->devfn;
 	info->dev = pdev;
@@ -2808,6 +2823,7 @@ static int vm_domain_add_dev_info(struct dmar_domain *domain,
 	if (!info)
 		return -ENOMEM;
 
+	info->segment = pci_domain_nr(pdev->bus);
 	info->bus = pdev->bus->number;
 	info->devfn = pdev->devfn;
 	info->dev = pdev;
@@ -2837,15 +2853,15 @@ static void iommu_detach_dependent_devices(struct intel_iommu *iommu,
 		parent = pdev->bus->self;
 		while (parent != tmp) {
 			iommu_detach_dev(iommu, parent->bus->number,
-				parent->devfn);
+					 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);
+			iommu_detach_dev(iommu, tmp->bus->number,
+					 tmp->devfn);
 	}
 }
 
@@ -2858,13 +2874,15 @@ static void vm_domain_remove_one_dev_info(struct dmar_domain *domain,
 	int found = 0;
 	struct list_head *entry, *tmp;
 
-	iommu = device_to_iommu(pdev->bus->number, pdev->devfn);
+	iommu = device_to_iommu(pci_domain_nr(pdev->bus), pdev->bus->number,
+				pdev->devfn);
 	if (!iommu)
 		return;
 
 	spin_lock_irqsave(&device_domain_lock, flags);
 	list_for_each_safe(entry, tmp, &domain->devices) {
 		info = list_entry(entry, struct device_domain_info, link);
+		/* No need to compare PCI domain; it has to be the same */
 		if (info->bus == pdev->bus->number &&
 		    info->devfn == pdev->devfn) {
 			list_del(&info->link);
@@ -2889,7 +2907,8 @@ static void vm_domain_remove_one_dev_info(struct dmar_domain *domain,
 		 * owned by this domain, clear this iommu in iommu_bmp
 		 * update iommu count and coherency
 		 */
-		if (device_to_iommu(info->bus, info->devfn) == iommu)
+		if (iommu == device_to_iommu(info->segment, info->bus,
+					    info->devfn))
 			found = 1;
 	}
 
@@ -2922,7 +2941,7 @@ static void vm_domain_remove_all_dev_info(struct dmar_domain *domain)
 
 		spin_unlock_irqrestore(&device_domain_lock, flags1);
 
-		iommu = device_to_iommu(info->bus, info->devfn);
+		iommu = device_to_iommu(info->segment, info->bus, info->devfn);
 		iommu_detach_dev(iommu, info->bus, info->devfn);
 		iommu_detach_dependent_devices(iommu, info->dev);
 
@@ -3110,7 +3129,8 @@ static int intel_iommu_attach_device(struct iommu_domain *domain,
 		}
 	}
 
-	iommu = device_to_iommu(pdev->bus->number, pdev->devfn);
+	iommu = device_to_iommu(pci_domain_nr(pdev->bus), pdev->bus->number,
+				pdev->devfn);
 	if (!iommu)
 		return -ENODEV;
 

include/linux/dmar.h

@@ -34,6 +34,7 @@ struct dmar_drhd_unit {
 	u64	reg_base_addr;		/* register base address*/
 	struct	pci_dev **devices; 	/* target device array	*/
 	int	devices_cnt;		/* target device count	*/
+	u16	segment;		/* PCI domain		*/
 	u8	ignored:1; 		/* ignore drhd		*/
 	u8	include_all:1;
 	struct intel_iommu *iommu;