x86/amd-iommu: Store device alias as dev_data pointer

This finally allows PCI-Device-IDs to be handled by the
IOMMU driver that have no corresponding struct device
present in the system.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

1 files changed, 15 insertions, 19 deletions

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index f64799878d45..0ed1c940d76b 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -203,7 +203,6 @@ static bool check_device(struct device *dev)
 static int iommu_init_device(struct device *dev)
 {
         struct iommu_dev_data *dev_data;
-        struct pci_dev *pdev;
         u16 alias;
 
         if (dev->archdata.iommu)
@@ -215,13 +214,16 @@ static int iommu_init_device(struct device *dev)
 
         alias = amd_iommu_alias_table[dev_data->devid];
         if (alias != dev_data->devid) {
-                pdev = pci_get_bus_and_slot(PCI_BUS(alias), alias & 0xff);
-                if (pdev)
-                        dev_data->alias = &pdev->dev;
-                else {
+                struct iommu_dev_data *alias_data;
+
+                alias_data = find_dev_data(alias);
+                if (alias_data == NULL) {
+                        pr_err("AMD-Vi: Warning: Unhandled device %s\n",
+                                        dev_name(dev));
                         free_dev_data(dev_data);
                         return -ENOTSUPP;
                 }
+                dev_data->alias_data = alias_data;
         }
 
         dev->archdata.iommu = dev_data;
@@ -1642,14 +1644,8 @@ static int __attach_device(struct iommu_dev_data *dev_data,
         /* lock domain */
         spin_lock(&domain->lock);
 
-        if (dev_data->alias != NULL) {
-                struct iommu_dev_data *alias_data;
-
-                alias_data = get_dev_data(dev_data->alias);
-
-                ret = -EINVAL;
-                if (!alias_data)
-                        goto out_unlock;
+        if (dev_data->alias_data != NULL) {
+                struct iommu_dev_data *alias_data = dev_data->alias_data;
 
                 /* Some sanity checks */
                 ret = -EBUSY;
@@ -1721,7 +1717,6 @@ static int attach_device(struct device *dev,
  */
 static void __detach_device(struct iommu_dev_data *dev_data)
 {
-        struct iommu_dev_data *alias_data;
         struct protection_domain *domain;
         unsigned long flags;
 
@@ -1731,8 +1726,9 @@ static void __detach_device(struct iommu_dev_data *dev_data)
 
         spin_lock_irqsave(&domain->lock, flags);
 
-        if (dev_data->alias) {
-                alias_data = get_dev_data(dev_data->alias);
+        if (dev_data->alias_data != NULL) {
+                struct iommu_dev_data *alias_data = dev_data->alias_data;
+
                 if (atomic_dec_and_test(&alias_data->bind))
                         do_detach(alias_data);
         }
@@ -1779,7 +1775,7 @@ static void detach_device(struct device *dev)
  */
 static struct protection_domain *domain_for_device(struct device *dev)
 {
-        struct iommu_dev_data *dev_data, *alias_data;
+        struct iommu_dev_data *dev_data;
         struct protection_domain *dom = NULL;
         unsigned long flags;
 
@@ -1788,8 +1784,8 @@ static struct protection_domain *domain_for_device(struct device *dev)
         if (dev_data->domain)
                 return dev_data->domain;
 
-        if (dev_data->alias != NULL) {
-                alias_data = get_dev_data(dev_data->alias);
+        if (dev_data->alias_data != NULL) {
+                struct iommu_dev_data *alias_data = dev_data->alias_data;
 
                 read_lock_irqsave(&amd_iommu_devtable_lock, flags);
                 if (alias_data->domain != NULL) {