[PATCH] powerpc: Add "partitionable endpoint" support

26-eeh-partition-endpoint.patch

New versions of firmware introduce a new method by which the
"partitionable endpoint" (the point at which the pci bus is cut)
should be located.  This code adds the support for this (mandatory)
new feature.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
(cherry picked from 9fcfb5d35b5294659f9299aa9cae6fd16325c07e commit)

2 files changed, 25 insertions, 2 deletions

diff --git a/arch/powerpc/platforms/pseries/eeh.c b/arch/powerpc/platforms/pseries/eeh.c
index 57bef2c2f325..46ea4acd9906 100644
--- a/arch/powerpc/platforms/pseries/eeh.c
+++ b/arch/powerpc/platforms/pseries/eeh.c
@@ -82,6 +82,7 @@ static int ibm_set_slot_reset;
 static int ibm_read_slot_reset_state;
 static int ibm_read_slot_reset_state2;
 static int ibm_slot_error_detail;
+static int ibm_get_config_addr_info;
 
 int eeh_subsystem_enabled;
 EXPORT_SYMBOL(eeh_subsystem_enabled);
@@ -457,6 +458,7 @@ eeh_slot_availability(struct pci_dn *pdn)
 static void
 rtas_pci_slot_reset(struct pci_dn *pdn, int state)
 {
+        int config_addr;
         int rc;
 
         BUG_ON (pdn==NULL); 
@@ -467,8 +469,13 @@ rtas_pci_slot_reset(struct pci_dn *pdn, int state)
                 return;
         }
 
+        /* Use PE configuration address, if present */
+        config_addr = pdn->eeh_config_addr;
+        if (pdn->eeh_pe_config_addr)
+                config_addr = pdn->eeh_pe_config_addr;
+
         rc = rtas_call(ibm_set_slot_reset,4,1, NULL,
-                       pdn->eeh_config_addr,
+                       config_addr,
                        BUID_HI(pdn->phb->buid),
                        BUID_LO(pdn->phb->buid),
                        state);
@@ -695,8 +702,22 @@ static void *early_enable_eeh(struct device_node *dn, void *data)
                         eeh_subsystem_enabled = 1;
                         pdn->eeh_mode |= EEH_MODE_SUPPORTED;
                         pdn->eeh_config_addr = regs[0];
+
+                        /* If the newer, better, ibm,get-config-addr-info is supported, 
+                         * then use that instead. */
+                        pdn->eeh_pe_config_addr = 0;
+                        if (ibm_get_config_addr_info != RTAS_UNKNOWN_SERVICE) {
+                                unsigned int rets[2];
+                                ret = rtas_call (ibm_get_config_addr_info, 4, 2, rets, 
+                                        pdn->eeh_config_addr, 
+                                        info->buid_hi, info->buid_lo,
+                                        0);
+                                if (ret == 0)
+                                        pdn->eeh_pe_config_addr = rets[0];
+                        }
 #ifdef DEBUG
-                        printk(KERN_DEBUG "EEH: %s: eeh enabled\n", dn->full_name);
+                        printk(KERN_DEBUG "EEH: %s: eeh enabled, config=%x pe_config=%x\n",
+                               dn->full_name, pdn->eeh_config_addr, pdn->eeh_pe_config_addr);
 #endif
                 } else {
 
@@ -748,6 +769,7 @@ void __init eeh_init(void)
         ibm_read_slot_reset_state2 = rtas_token("ibm,read-slot-reset-state2");
         ibm_read_slot_reset_state = rtas_token("ibm,read-slot-reset-state");
         ibm_slot_error_detail = rtas_token("ibm,slot-error-detail");
+        ibm_get_config_addr_info = rtas_token("ibm,get-config-addr-info");
 
         if (ibm_set_eeh_option == RTAS_UNKNOWN_SERVICE)
                 return;
diff --git a/include/asm-powerpc/pci-bridge.h b/include/asm-powerpc/pci-bridge.h
index 1a08860e789e..a81bc363f350 100644
--- a/include/asm-powerpc/pci-bridge.h
+++ b/include/asm-powerpc/pci-bridge.h
@@ -68,6 +68,7 @@ struct pci_dn {
 #ifdef CONFIG_PPC_PSERIES
         int     eeh_mode;               /* See eeh.h for possible EEH_MODEs */
         int     eeh_config_addr;
+        int     eeh_pe_config_addr; /* new-style partition endpoint address */
         int     eeh_check_count;        /* # times driver ignored error */
         int     eeh_freeze_count;       /* # times this device froze up. */
         int     eeh_is_bridge;          /* device is pci-to-pci bridge */