powerpc/eeh: Replace pci_dn with eeh_dev for EEH address cache

With original EEH implementation, struct pci_dn is used while building
PCI I/O address cache, which helps on searching the corresponding
PCI device according to the given physical I/O address. Besides, pci_dn
is associated with the corresponding PCI device while building its
I/O cache.

The patch replaces struct pci_dn with struct eeh_dev so that EEH address
cache won't depend on struct pci_dn. That will help EEH to become an
independent module in future. Besides, the binding of eeh_dev and PCI
device is done while building PCI device I/O cache.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 20 insertions, 7 deletions

diff --git a/arch/powerpc/platforms/pseries/eeh_cache.c b/arch/powerpc/platforms/pseries/eeh_cache.c
index 7c36a9cc78c6..e5ae1c687c66 100644
--- a/arch/powerpc/platforms/pseries/eeh_cache.c
+++ b/arch/powerpc/platforms/pseries/eeh_cache.c
@@ -175,7 +175,7 @@ pci_addr_cache_insert(struct pci_dev *dev, unsigned long alo,
 static void __pci_addr_cache_insert_device(struct pci_dev *dev)
 {
         struct device_node *dn;
-        struct pci_dn *pdn;
+        struct eeh_dev *edev;
         int i;
 
         dn = pci_device_to_OF_node(dev);
@@ -184,13 +184,19 @@ static void __pci_addr_cache_insert_device(struct pci_dev *dev)
                 return;
         }
 
+        edev = of_node_to_eeh_dev(dn);
+        if (!edev) {
+                pr_warning("PCI: no EEH dev found for dn=%s\n",
+                        dn->full_name);
+                return;
+        }
+
         /* Skip any devices for which EEH is not enabled. */
-        pdn = PCI_DN(dn);
-        if (!(pdn->eeh_mode & EEH_MODE_SUPPORTED) ||
-            pdn->eeh_mode & EEH_MODE_NOCHECK) {
+        if (!(edev->mode & EEH_MODE_SUPPORTED) ||
+            edev->mode & EEH_MODE_NOCHECK) {
 #ifdef DEBUG
-                printk(KERN_INFO "PCI: skip building address cache for=%s - %s\n",
-                       pci_name(dev), pdn->node->full_name);
+                pr_info("PCI: skip building address cache for=%s - %s\n",
+                        pci_name(dev), dn->full_name);
 #endif
                 return;
         }
@@ -281,6 +287,7 @@ void pci_addr_cache_remove_device(struct pci_dev *dev)
 void __init pci_addr_cache_build(void)
 {
         struct device_node *dn;
+        struct eeh_dev *edev;
         struct pci_dev *dev = NULL;
 
         spin_lock_init(&pci_io_addr_cache_root.piar_lock);
@@ -291,8 +298,14 @@ void __init pci_addr_cache_build(void)
                 dn = pci_device_to_OF_node(dev);
                 if (!dn)
                         continue;
+
+                edev = of_node_to_eeh_dev(dn);
+                if (!edev)
+                        continue;
+
                 pci_dev_get(dev);  /* matching put is in eeh_remove_device() */
-                PCI_DN(dn)->pcidev = dev;
+                dev->dev.archdata.edev = edev;
+                edev->pdev = dev;
 
                 eeh_sysfs_add_device(dev);
         }