[PATCH 39/42]: ppc64: handle multifunction PCI devices properly

[Linas Vepstas]

239-eeh-multifunction-consolidate.patch

New-style firmware will often place multiple different functions 
under a non-EEH-aware parent.  However, tehse devices might share 
a common PE "partition endpoint" and config address, ad thus any
EEH events will affect all of the devices in common.  This patch
makes the effort to find all of these common devices and handle
them together.

Signed-off-by: Linas Vepstas <linas at austin.ibm.com>

--
Index: linux-2.6.14-git3/arch/powerpc/platforms/pseries/eeh.c
===================================================================
--- linux-2.6.14-git3.orig/arch/powerpc/platforms/pseries/eeh.c	2005-11-02 14:48:13.093298267 -0600
+++ linux-2.6.14-git3/arch/powerpc/platforms/pseries/eeh.c	2005-11-02 14:48:44.941831253 -0600
@@ -223,6 +223,11 @@
 void eeh_mark_slot (struct device_node *dn, int mode_flag)
 {
 	dn = find_device_pe (dn);
+
+	/* Back up one, since config addrs might be shared */
+	if (PCI_DN(dn) && PCI_DN(dn)->eeh_pe_config_addr)
+		dn = dn->parent;
+
 	PCI_DN(dn)->eeh_mode |= mode_flag;
 	__eeh_mark_slot (dn->child, mode_flag);
 }
@@ -244,7 +249,13 @@
 {
 	unsigned long flags;
 	spin_lock_irqsave(&confirm_error_lock, flags);
+	
 	dn = find_device_pe (dn);
+	
+	/* Back up one, since config addrs might be shared */
+	if (PCI_DN(dn) && PCI_DN(dn)->eeh_pe_config_addr)
+		dn = dn->parent;
+
 	PCI_DN(dn)->eeh_mode &= ~mode_flag;
 	PCI_DN(dn)->eeh_check_count = 0;
 	__eeh_clear_slot (dn->child, mode_flag);
@@ -609,7 +620,7 @@
 	if (!pdn) 
 		return;
 	
-	if (! pdn->eeh_is_bridge)
+	if ((pdn->eeh_mode & EEH_MODE_SUPPORTED) && (!pdn->eeh_is_bridge))
 		__restore_bars (pdn);
 
 	dn = pdn->node->child;
Index: linux-2.6.14-git3/arch/powerpc/platforms/pseries/eeh_driver.c
===================================================================
--- linux-2.6.14-git3.orig/arch/powerpc/platforms/pseries/eeh_driver.c	2005-11-02 14:48:13.100297285 -0600
+++ linux-2.6.14-git3/arch/powerpc/platforms/pseries/eeh_driver.c	2005-11-02 14:48:44.950829991 -0600
@@ -213,9 +213,23 @@
 	if (rc)
 		return rc;
 
-	/* Walk over all functions on this device */
-	rtas_configure_bridge(pe_dn);
-	eeh_restore_bars(pe_dn);
+ 	/* New-style config addrs might be shared across multiple devices,
+ 	 * Walk over all functions on this device */
+ 	if (pe_dn->eeh_pe_config_addr) {
+ 		struct device_node *pe = pe_dn->node;
+ 		pe = pe->parent->child;
+ 		while (pe) {
+ 			struct pci_dn *ppe = PCI_DN(pe);
+ 			if (pe_dn->eeh_pe_config_addr == ppe->eeh_pe_config_addr) {
+ 				rtas_configure_bridge(ppe);
+ 				eeh_restore_bars(ppe);
+ 			}
+ 			pe = pe->sibling;
+ 		}
+ 	} else {
+ 		rtas_configure_bridge(pe_dn);
+ 		eeh_restore_bars(pe_dn);
+ 	}
 
 	/* Give the system 5 seconds to finish running the user-space
 	 * hotplug shutdown scripts, e.g. ifdown for ethernet.  Yes,