powerpc/eeh: Create eeh_dev from pci_dn instead of device_node

The patch adds function traverse_pci_dn(), which is similar to
traverse_pci_devices() except it takes pci_dn, not device_node
as parameter. The pci_dev.c has been reworked to create eeh_dev
from pci_dn, instead of device_node.

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

6 files changed, 69 insertions, 11 deletions

diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h
index 55abfd09e47f..2106f83da2d5 100644
--- a/arch/powerpc/include/asm/eeh.h
+++ b/arch/powerpc/include/asm/eeh.h
@@ -30,6 +30,7 @@
 struct pci_dev;
 struct pci_bus;
 struct device_node;
+struct pci_dn;
 
 #ifdef CONFIG_EEH
 
@@ -137,6 +138,7 @@ struct eeh_dev {
         struct list_head list;          /* Form link list in the PE     */
         struct pci_controller *phb;     /* Associated PHB               */
         struct device_node *dn;         /* Associated device node       */
+        struct pci_dn *pdn;             /* Associated PCI device node   */
         struct pci_dev *pdev;           /* Associated PCI device        */
         struct pci_bus *bus;            /* PCI bus for partial hotplug  */
 };
@@ -146,6 +148,11 @@ static inline struct device_node *eeh_dev_to_of_node(struct eeh_dev *edev)
         return edev ? edev->dn : NULL;
 }
 
+static inline struct pci_dn *eeh_dev_to_pdn(struct eeh_dev *edev)
+{
+        return edev ? edev->pdn : NULL;
+}
+
 static inline struct pci_dev *eeh_dev_to_pci_dev(struct eeh_dev *edev)
 {
         return edev ? edev->pdev : NULL;
@@ -272,7 +279,7 @@ void eeh_pe_restore_bars(struct eeh_pe *pe);
 const char *eeh_pe_loc_get(struct eeh_pe *pe);
 struct pci_bus *eeh_pe_bus_get(struct eeh_pe *pe);
 
-void *eeh_dev_init(struct device_node *dn, void *data);
+void *eeh_dev_init(struct pci_dn *pdn, void *data);
 void eeh_dev_phb_init_dynamic(struct pci_controller *phb);
 int eeh_init(void);
 int __init eeh_ops_register(struct eeh_ops *ops);
@@ -323,7 +330,7 @@ static inline int eeh_init(void)
         return 0;
 }
 
-static inline void *eeh_dev_init(struct device_node *dn, void *data)
+static inline void *eeh_dev_init(struct pci_dn *pdn, void *data)
 {
         return NULL;
 }
diff --git a/arch/powerpc/include/asm/pci-bridge.h b/arch/powerpc/include/asm/pci-bridge.h
index 01b730a8a5a3..7b74499b728c 100644
--- a/arch/powerpc/include/asm/pci-bridge.h
+++ b/arch/powerpc/include/asm/pci-bridge.h
@@ -213,8 +213,14 @@ static inline struct eeh_dev *of_node_to_eeh_dev(struct device_node *dn)
 
         return PCI_DN(dn)->edev;
 }
+
+static inline struct eeh_dev *pdn_to_eeh_dev(struct pci_dn *pdn)
+{
+        return pdn ? pdn->edev : NULL;
+}
 #else
-#define of_node_to_eeh_dev(x) (NULL)
+#define of_node_to_eeh_dev(x)   (NULL)
+#define pdn_to_eeh_dev(x)       (NULL)
 #endif
 
 /** Find the bus corresponding to the indicated device node */
diff --git a/arch/powerpc/include/asm/ppc-pci.h b/arch/powerpc/include/asm/ppc-pci.h
index db1e2b8eff3c..ade75238ceb5 100644
--- a/arch/powerpc/include/asm/ppc-pci.h
+++ b/arch/powerpc/include/asm/ppc-pci.h
@@ -33,9 +33,14 @@ extern struct pci_dev *isa_bridge_pcidev;	/* may be NULL if no ISA bus */
 
 /* PCI device_node operations */
 struct device_node;
+struct pci_dn;
+
 typedef void *(*traverse_func)(struct device_node *me, void *data);
 void *traverse_pci_devices(struct device_node *start, traverse_func pre,
                 void *data);
+void *traverse_pci_dn(struct pci_dn *root,
+                      void *(*fn)(struct pci_dn *, void *),
+                      void *data);
 
 extern void pci_devs_phb_init(void);
 extern void pci_devs_phb_init_dynamic(struct pci_controller *phb);
diff --git a/arch/powerpc/kernel/eeh_dev.c b/arch/powerpc/kernel/eeh_dev.c
index e5274ee9a75f..aabba94ff9cb 100644
--- a/arch/powerpc/kernel/eeh_dev.c
+++ b/arch/powerpc/kernel/eeh_dev.c
@@ -43,13 +43,13 @@
 
 /**
  * eeh_dev_init - Create EEH device according to OF node
- * @dn: device node
+ * @pdn: PCI device node
  * @data: PHB
  *
  * It will create EEH device according to the given OF node. The function
  * might be called by PCI emunation, DR, PHB hotplug.
  */
-void *eeh_dev_init(struct device_node *dn, void *data)
+void *eeh_dev_init(struct pci_dn *pdn, void *data)
 {
         struct pci_controller *phb = data;
         struct eeh_dev *edev;
@@ -63,8 +63,8 @@ void *eeh_dev_init(struct device_node *dn, void *data)
         }
 
         /* Associate EEH device with OF node */
-        PCI_DN(dn)->edev = edev;
-        edev->dn  = dn;
+        pdn->edev = edev;
+        edev->pdn = pdn;
         edev->phb = phb;
         INIT_LIST_HEAD(&edev->list);
 
@@ -80,16 +80,16 @@ void *eeh_dev_init(struct device_node *dn, void *data)
  */
 void eeh_dev_phb_init_dynamic(struct pci_controller *phb)
 {
-        struct device_node *dn = phb->dn;
+        struct pci_dn *root = phb->pci_data;
 
         /* EEH PE for PHB */
         eeh_phb_pe_create(phb);
 
         /* EEH device for PHB */
-        eeh_dev_init(dn, phb);
+        eeh_dev_init(root, phb);
 
         /* EEH devices for children OF nodes */
-        traverse_pci_devices(dn, eeh_dev_init, phb);
+        traverse_pci_dn(root, eeh_dev_init, phb);
 }
 
 /**
diff --git a/arch/powerpc/kernel/pci_dn.c b/arch/powerpc/kernel/pci_dn.c
index d139f72ff9d5..65b98367005c 100644
--- a/arch/powerpc/kernel/pci_dn.c
+++ b/arch/powerpc/kernel/pci_dn.c
@@ -246,6 +246,46 @@ void *traverse_pci_devices(struct device_node *start, traverse_func pre,
         return NULL;
 }
 
+static struct pci_dn *pci_dn_next_one(struct pci_dn *root,
+                                      struct pci_dn *pdn)
+{
+        struct list_head *next = pdn->child_list.next;
+
+        if (next != &pdn->child_list)
+                return list_entry(next, struct pci_dn, list);
+
+        while (1) {
+                if (pdn == root)
+                        return NULL;
+
+                next = pdn->list.next;
+                if (next != &pdn->parent->child_list)
+                        break;
+
+                pdn = pdn->parent;
+        }
+
+        return list_entry(next, struct pci_dn, list);
+}
+
+void *traverse_pci_dn(struct pci_dn *root,
+                      void *(*fn)(struct pci_dn *, void *),
+                      void *data)
+{
+        struct pci_dn *pdn = root;
+        void *ret;
+
+        /* Only scan the child nodes */
+        for (pdn = pci_dn_next_one(root, pdn); pdn;
+             pdn = pci_dn_next_one(root, pdn)) {
+                ret = fn(pdn, data);
+                if (ret)
+                        return ret;
+        }
+
+        return NULL;
+}
+
 /** 
  * pci_devs_phb_init_dynamic - setup pci devices under this PHB
  * phb: pci-to-host bridge (top-level bridge connecting to cpu)
diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index e445b6701f50..70304070a260 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -265,7 +265,7 @@ static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long act
                         update_dn_pci_info(np, pci->phb);
 
                         /* Create EEH device for the OF node */
-                        eeh_dev_init(np, pci->phb);
+                        eeh_dev_init(PCI_DN(np), pci->phb);
                 }
                 break;
         default: