[PATCH] dlpar regression for ppc64 - probe change

This patch contains the driver bits for enabling DLPAR and PCI Hotplug
for the new OF-based PCI probe.  This functionality was regressed when
the new PCI approach was introduced.  Please apply if appropriate.

Signed-off-by: John Rose <johnrose@austin.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 81 insertions, 76 deletions

diff --git a/drivers/pci/hotplug/rpadlpar_core.c b/drivers/pci/hotplug/rpadlpar_core.c
index e8593a60ee89..cc03609f45d0 100644
--- a/drivers/pci/hotplug/rpadlpar_core.c
+++ b/drivers/pci/hotplug/rpadlpar_core.c
@@ -134,43 +134,6 @@ static void rpadlpar_claim_one_bus(struct pci_bus *b)
                 rpadlpar_claim_one_bus(child_bus);
 }
 
-static int pci_add_secondary_bus(struct device_node *dn,
-                struct pci_dev *bridge_dev)
-{
-        struct pci_dn *pdn = dn->data;
-        struct pci_controller *hose = pdn->phb;
-        struct pci_bus *child;
-        u8 sec_busno;
-
-        /* Get busno of downstream bus */
-        pci_read_config_byte(bridge_dev, PCI_SECONDARY_BUS, &sec_busno);
-
-        /* Allocate and add to children of bridge_dev->bus */
-        child = pci_add_new_bus(bridge_dev->bus, bridge_dev, sec_busno);
-        if (!child) {
-                printk(KERN_ERR "%s: could not add secondary bus\n", __FUNCTION__);
-                return -ENOMEM;
-        }
-
-        sprintf(child->name, "PCI Bus #%02x", child->number);
-
-        /* Fixup subordinate bridge bases and resources */
-        pcibios_fixup_bus(child);
-
-        /* Claim new bus resources */
-        rpadlpar_claim_one_bus(bridge_dev->bus);
-
-        if (hose->last_busno < child->number)
-                hose->last_busno = child->number;
-
-        pdn->bussubno = child->number;
-
-        /* ioremap() for child bus, which may or may not succeed */
-        remap_bus_range(child);
-
-        return 0;
-}
-
 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
                                         struct device_node *dev_dn)
 {
@@ -188,29 +151,41 @@ static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
 static struct pci_dev *dlpar_pci_add_bus(struct device_node *dn)
 {
         struct pci_dn *pdn = dn->data;
-        struct pci_controller *hose = pdn->phb;
+        struct pci_controller *phb = pdn->phb;
         struct pci_dev *dev = NULL;
 
-        /* Scan phb bus for EADS device, adding new one to bus->devices */
-        if (!pci_scan_single_device(hose->bus, pdn->devfn)) {
-                printk(KERN_ERR "%s: found no device on bus\n", __FUNCTION__);
+        rpaphp_eeh_init_nodes(dn);
+        /* Add EADS device to PHB bus, adding new entry to bus->devices */
+        dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
+        if (!dev) {
+                printk(KERN_ERR "%s: failed to create pci dev for %s\n",
+                                __FUNCTION__, dn->full_name);
                 return NULL;
         }
 
+        if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
+            dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
+                of_scan_pci_bridge(dn, dev);
+
+        rpaphp_init_new_devs(dev->subordinate);
+
+        /* Claim new bus resources */
+        rpadlpar_claim_one_bus(dev->bus);
+
+        /* ioremap() for child bus, which may or may not succeed */
+        (void) remap_bus_range(dev->bus);
+
         /* Add new devices to global lists.  Register in proc, sysfs. */
-        pci_bus_add_devices(hose->bus);
+        pci_bus_add_devices(phb->bus);
 
         /* Confirm new bridge dev was created */
-        dev = dlpar_find_new_dev(hose->bus, dn);
+        dev = dlpar_find_new_dev(phb->bus, dn);
         if (dev) {
                 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
                         printk(KERN_ERR "%s: unexpected header type %d\n",
                                 __FUNCTION__, dev->hdr_type);
                         return NULL;
                 }
-
-                if (pci_add_secondary_bus(dn, dev))
-                        return NULL;
         }
 
         return dev;
@@ -219,7 +194,6 @@ static struct pci_dev *dlpar_pci_add_bus(struct device_node *dn)
 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
 {
         struct pci_dev *dev;
-        int rc;
 
         if (rpaphp_find_pci_bus(dn))
                 return -EINVAL;
@@ -232,15 +206,6 @@ static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
                 return -EIO;
         }
 
-        if (dn->child) {
-                rc = rpaphp_config_pci_adapter(dev->subordinate);
-                if (rc < 0) {
-                        printk(KERN_ERR "%s: unable to enable slot %s\n",
-                                __FUNCTION__, drc_name);
-                        return -EIO;
-                }
-        }
-
         /* Add hotplug slot */
         if (rpaphp_add_slot(dn)) {
                 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
@@ -435,6 +400,8 @@ int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
                                 __FUNCTION__, drc_name);
                         return -EIO;
                 }
+        } else {
+                rpaphp_unconfig_pci_adapter(bus);
         }
 
         if (unmap_bus_range(bus)) {
diff --git a/drivers/pci/hotplug/rpaphp.h b/drivers/pci/hotplug/rpaphp.h
index 71ea5f9bb284..57ea71a7bda5 100644
--- a/drivers/pci/hotplug/rpaphp.h
+++ b/drivers/pci/hotplug/rpaphp.h
@@ -93,6 +93,8 @@ extern int rpaphp_claim_resource(struct pci_dev *dev, int resource);
 extern int rpaphp_enable_pci_slot(struct slot *slot);
 extern int register_pci_slot(struct slot *slot);
 extern int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value);
+extern void rpaphp_init_new_devs(struct pci_bus *bus);
+extern void rpaphp_eeh_init_nodes(struct device_node *dn);
 
 extern int rpaphp_config_pci_adapter(struct pci_bus *bus);
 extern int rpaphp_unconfig_pci_adapter(struct pci_bus *bus);
diff --git a/drivers/pci/hotplug/rpaphp_pci.c b/drivers/pci/hotplug/rpaphp_pci.c
index f7c12d7dfcfc..a7859a84d1ae 100644
--- a/drivers/pci/hotplug/rpaphp_pci.c
+++ b/drivers/pci/hotplug/rpaphp_pci.c
@@ -154,8 +154,7 @@ exit:
 }
 
 /* Must be called before pci_bus_add_devices */
-static void 
-rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
+void rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
 {
         struct pci_dev *dev;
 
@@ -184,6 +183,20 @@ rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
         }
 }
 
+static void rpaphp_eeh_add_bus_device(struct pci_bus *bus)
+{
+        struct pci_dev *dev;
+
+        list_for_each_entry(dev, &bus->devices, bus_list) {
+                eeh_add_device_late(dev);
+                if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
+                        struct pci_bus *subbus = dev->subordinate;
+                        if (subbus)
+                                rpaphp_eeh_add_bus_device (subbus);
+                }
+        }
+}
+
 static int rpaphp_pci_config_bridge(struct pci_dev *dev)
 {
         u8 sec_busno;
@@ -217,6 +230,13 @@ static int rpaphp_pci_config_bridge(struct pci_dev *dev)
         return 0;
 }
 
+void rpaphp_init_new_devs(struct pci_bus *bus)
+{
+        rpaphp_fixup_new_pci_devices(bus, 0);
+        rpaphp_eeh_add_bus_device(bus);
+}
+EXPORT_SYMBOL_GPL(rpaphp_init_new_devs);
+
 /*****************************************************************************
  rpaphp_pci_config_slot() will  configure all devices under the
  given slot->dn and return the the first pci_dev.
@@ -233,36 +253,51 @@ rpaphp_pci_config_slot(struct pci_bus *bus)
         if (!dn || !dn->child)
                 return NULL;
 
-        slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
+        if (systemcfg->platform == PLATFORM_PSERIES_LPAR) {
+                of_scan_bus(dn, bus);
+                if (list_empty(&bus->devices)) {
+                        err("%s: No new device found\n", __FUNCTION__);
+                        return NULL;
+                }
 
-        /* pci_scan_slot should find all children */
-        num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
-        if (num) {
-                rpaphp_fixup_new_pci_devices(bus, 1);
+                rpaphp_init_new_devs(bus);
                 pci_bus_add_devices(bus);
-        }
-        if (list_empty(&bus->devices)) {
-                err("%s: No new device found\n", __FUNCTION__);
-                return NULL;
-        }
-        list_for_each_entry(dev, &bus->devices, bus_list) {
-                if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
-                        rpaphp_pci_config_bridge(dev);
+                dev = list_entry(&bus->devices, struct pci_dev, bus_list);
+        } else {
+                slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
+
+                /* pci_scan_slot should find all children */
+                num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
+                if (num) {
+                        rpaphp_fixup_new_pci_devices(bus, 1);
+                        pci_bus_add_devices(bus);
+                }
+                if (list_empty(&bus->devices)) {
+                        err("%s: No new device found\n", __FUNCTION__);
+                        return NULL;
+                }
+                list_for_each_entry(dev, &bus->devices, bus_list) {
+                        if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
+                                rpaphp_pci_config_bridge(dev);
+
+                        rpaphp_eeh_add_bus_device(bus);
+                }
         }
 
         return dev;
 }
 
-static void enable_eeh(struct device_node *dn)
+void rpaphp_eeh_init_nodes(struct device_node *dn)
 {
         struct device_node *sib;
 
         for (sib = dn->child; sib; sib = sib->sibling) 
-                enable_eeh(sib);
+                rpaphp_eeh_init_nodes(sib);
         eeh_add_device_early(dn);
         return;
         
 }
+EXPORT_SYMBOL_GPL(rpaphp_eeh_init_nodes);
 
 static void print_slot_pci_funcs(struct pci_bus *bus)
 {
@@ -289,7 +324,7 @@ int rpaphp_config_pci_adapter(struct pci_bus *bus)
         if (!dn)
                 goto exit;
 
-        enable_eeh(dn);
+        rpaphp_eeh_init_nodes(dn);
         dev = rpaphp_pci_config_slot(bus);
         if (!dev) {
                 err("%s: can't find any devices.\n", __FUNCTION__);
@@ -331,6 +366,7 @@ int rpaphp_unconfig_pci_adapter(struct pci_bus *bus)
         }
         return 0;
 }
+EXPORT_SYMBOL_GPL(rpaphp_unconfig_pci_adapter);
 
 static int setup_pci_hotplug_slot_info(struct slot *slot)
 {
@@ -444,8 +480,8 @@ int rpaphp_enable_pci_slot(struct slot *slot)
                 retval = rpaphp_config_pci_adapter(slot->bus);
                 if (!retval) {
                         slot->state = CONFIGURED;
-                        dbg("%s: PCI devices in slot[%s] has been configured\n", 
-                                __FUNCTION__, slot->name);
+                        info("%s: devices in slot[%s] configured\n",
+                                        __FUNCTION__, slot->name);
                 } else {
                         slot->state = NOT_CONFIGURED;
                         dbg("%s: no pci_dev struct for adapter in slot[%s]\n",