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>

3 files changed, 50 insertions, 28 deletions

diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index 3fbe6af7ad71..25a00ce4f24d 100644
--- a/drivers/pci/dmar.c
+++ b/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);
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 6262c198e56e..fd7472f28674 100644
--- a/drivers/pci/intel-iommu.c
+++ b/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 */
@@ -468,7 +469,7 @@ 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;
@@ -476,6 +477,8 @@ static struct intel_iommu *device_to_iommu(u8 bus, u8 devfn)
         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 @@ found_domain:
         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;
 
diff --git a/include/linux/dmar.h b/include/linux/dmar.h
index 4a0ce6f27e1b..e397dc342cda 100644
--- a/include/linux/dmar.h
+++ b/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;