powerpc/eeh: Move common part to kernel directory

The patch moves the common part of EEH core into arch/powerpc/kernel
directory so that we needn't PPC_PSERIES while compiling POWERNV
platform:

        * Move the EEH common part into arch/powerpc/kernel
        * Move the functions for PCI hotplug from pSeries platform to
          arch/powerpc/kernel/pci-hotplug.c
        * Move CONFIG_EEH from arch/powerpc/platforms/pseries/Kconfig to
          arch/powerpc/platforms/Kconfig
        * Adjust makefile accordingly
Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/kernel/Makefile

@@ -58,6 +58,8 @@ obj-$(CONFIG_RTAS_PROC)		+= rtas-proc.o
 obj-$(CONFIG_LPARCFG)		+= lparcfg.o
 obj-$(CONFIG_IBMVIO)		+= vio.o
 obj-$(CONFIG_IBMEBUS)           += ibmebus.o
+obj-$(CONFIG_EEH)              += eeh.o eeh_pe.o eeh_dev.o eeh_cache.o \
+				  eeh_driver.o eeh_event.o eeh_sysfs.o
 obj-$(CONFIG_GENERIC_TBSYNC)	+= smp-tbsync.o
 obj-$(CONFIG_CRASH_DUMP)	+= crash_dump.o
 obj-$(CONFIG_FA_DUMP)		+= fadump.o
@@ -100,7 +102,7 @@ obj-$(CONFIG_PPC_UDBG_16550)	+= legacy_serial.o udbg_16550.o
 obj-$(CONFIG_STACKTRACE)	+= stacktrace.o
 obj-$(CONFIG_SWIOTLB)		+= dma-swiotlb.o
 
-pci64-$(CONFIG_PPC64)		+= pci_dn.o isa-bridge.o
+pci64-$(CONFIG_PPC64)		+= pci_dn.o pci-hotplug.o isa-bridge.o
 obj-$(CONFIG_PCI)		+= pci_$(CONFIG_WORD_SIZE).o $(pci64-y) \
 				   pci-common.o pci_of_scan.o
 obj-$(CONFIG_PCI_MSI)		+= msi.o

arch/powerpc/platforms/pseries/eeh_cache.c → arch/powerpc/kernel/eeh_cache.c

@@ -316,4 +316,3 @@ void __init eeh_addr_cache_build(void)
 	eeh_addr_cache_print(&pci_io_addr_cache_root);
 #endif
 }
-

arch/powerpc/platforms/pseries/eeh_driver.c → arch/powerpc/kernel/eeh_driver.c

@@ -549,4 +549,3 @@ void eeh_handle_event(struct eeh_pe *pe)
 	if (frozen_bus)
 		pcibios_remove_pci_devices(frozen_bus);
 }
-

arch/powerpc/platforms/pseries/eeh_sysfs.c → arch/powerpc/kernel/eeh_sysfs.c

@@ -72,4 +72,3 @@ void eeh_sysfs_remove_device(struct pci_dev *pdev)
 	device_remove_file(&pdev->dev, &dev_attr_eeh_config_addr);
 	device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
 }
-

arch/powerpc/kernel/pci-hotplug.c

+/*
+ * Derived from "arch/powerpc/platforms/pseries/pci_dlpar.c"
+ *
+ * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
+ * Copyright (C) 2005 International Business Machines
+ *
+ * Updates, 2005, John Rose <johnrose@austin.ibm.com>
+ * Updates, 2005, Linas Vepstas <linas@austin.ibm.com>
+ * Updates, 2013, Gavin Shan <shangw@linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/pci.h>
+#include <linux/export.h>
+#include <asm/pci-bridge.h>
+#include <asm/ppc-pci.h>
+#include <asm/firmware.h>
+#include <asm/eeh.h>
+
+/**
+ * __pcibios_remove_pci_devices - remove all devices under this bus
+ * @bus: the indicated PCI bus
+ * @purge_pe: destroy the PE on removal of PCI devices
+ *
+ * Remove all of the PCI devices under this bus both from the
+ * linux pci device tree, and from the powerpc EEH address cache.
+ * By default, the corresponding PE will be destroied during the
+ * normal PCI hotplug path. For PCI hotplug during EEH recovery,
+ * the corresponding PE won't be destroied and deallocated.
+ */
+void __pcibios_remove_pci_devices(struct pci_bus *bus, int purge_pe)
+{
+	struct pci_dev *dev, *tmp;
+	struct pci_bus *child_bus;
+
+	/* First go down child busses */
+	list_for_each_entry(child_bus, &bus->children, node)
+		__pcibios_remove_pci_devices(child_bus, purge_pe);
+
+	pr_debug("PCI: Removing devices on bus %04x:%02x\n",
+		 pci_domain_nr(bus),  bus->number);
+	list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
+		pr_debug("     * Removing %s...\n", pci_name(dev));
+		eeh_remove_bus_device(dev, purge_pe);
+		pci_stop_and_remove_bus_device(dev);
+	}
+}
+
+/**
+ * pcibios_remove_pci_devices - remove all devices under this bus
+ * @bus: the indicated PCI bus
+ *
+ * Remove all of the PCI devices under this bus both from the
+ * linux pci device tree, and from the powerpc EEH address cache.
+ */
+void pcibios_remove_pci_devices(struct pci_bus *bus)
+{
+	__pcibios_remove_pci_devices(bus, 1);
+}
+EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices);
+
+/**
+ * pcibios_add_pci_devices - adds new pci devices to bus
+ * @bus: the indicated PCI bus
+ *
+ * This routine will find and fixup new pci devices under
+ * the indicated bus. This routine presumes that there
+ * might already be some devices under this bridge, so
+ * it carefully tries to add only new devices.  (And that
+ * is how this routine differs from other, similar pcibios
+ * routines.)
+ */
+void pcibios_add_pci_devices(struct pci_bus * bus)
+{
+	int slotno, num, mode, pass, max;
+	struct pci_dev *dev;
+	struct device_node *dn = pci_bus_to_OF_node(bus);
+
+	eeh_add_device_tree_early(dn);
+
+	mode = PCI_PROBE_NORMAL;
+	if (ppc_md.pci_probe_mode)
+		mode = ppc_md.pci_probe_mode(bus);
+
+	if (mode == PCI_PROBE_DEVTREE) {
+		/* use ofdt-based probe */
+		of_rescan_bus(dn, bus);
+	} else if (mode == PCI_PROBE_NORMAL) {
+		/* use legacy probe */
+		slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
+		num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
+		if (!num)
+			return;
+		pcibios_setup_bus_devices(bus);
+		max = bus->busn_res.start;
+		for (pass = 0; pass < 2; pass++) {
+			list_for_each_entry(dev, &bus->devices, bus_list) {
+				if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
+				    dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
+					max = pci_scan_bridge(bus, dev,
+							      max, pass);
+			}
+		}
+	}
+	pcibios_finish_adding_to_bus(bus);
+}
+EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);

arch/powerpc/platforms/Kconfig

@@ -164,6 +164,11 @@ config IBMEBUS
 	help
 	  Bus device driver for GX bus based adapters.
 
+config EEH
+	bool
+	depends on (PPC_POWERNV || PPC_PSERIES) && PCI
+	default y
+
 config PPC_MPC106
 	bool
 	default n

arch/powerpc/platforms/pseries/Kconfig

@@ -33,11 +33,6 @@ config PPC_SPLPAR
 	  processors, that is, which share physical processors between
 	  two or more partitions.
 
-config EEH
-	bool
-	depends on PPC_PSERIES && PCI
-	default y
-
 config PSERIES_MSI
        bool
        depends on PCI_MSI && EEH

arch/powerpc/platforms/pseries/Makefile

@@ -6,9 +6,7 @@ obj-y			:= lpar.o hvCall.o nvram.o reconfig.o \
 			   firmware.o power.o dlpar.o mobility.o
 obj-$(CONFIG_SMP)	+= smp.o
 obj-$(CONFIG_SCANLOG)	+= scanlog.o
-obj-$(CONFIG_EEH)	+= eeh.o eeh_pe.o eeh_dev.o eeh_cache.o \
-			   eeh_driver.o eeh_event.o eeh_sysfs.o \
-			   eeh_pseries.o
+obj-$(CONFIG_EEH)	+= eeh_pseries.o
 obj-$(CONFIG_KEXEC)	+= kexec.o
 obj-$(CONFIG_PCI)	+= pci.o pci_dlpar.o
 obj-$(CONFIG_PSERIES_MSI)	+= msi.o

arch/powerpc/platforms/pseries/pci_dlpar.c

@@ -64,91 +64,6 @@ pcibios_find_pci_bus(struct device_node *dn)
 }
 EXPORT_SYMBOL_GPL(pcibios_find_pci_bus);
 
-/**
- * __pcibios_remove_pci_devices - remove all devices under this bus
- * @bus: the indicated PCI bus
- * @purge_pe: destroy the PE on removal of PCI devices
- *
- * Remove all of the PCI devices under this bus both from the
- * linux pci device tree, and from the powerpc EEH address cache.
- * By default, the corresponding PE will be destroied during the
- * normal PCI hotplug path. For PCI hotplug during EEH recovery,
- * the corresponding PE won't be destroied and deallocated.
- */
-void __pcibios_remove_pci_devices(struct pci_bus *bus, int purge_pe)
-{
-	struct pci_dev *dev, *tmp;
-	struct pci_bus *child_bus;
-
-	/* First go down child busses */
-	list_for_each_entry(child_bus, &bus->children, node)
-		__pcibios_remove_pci_devices(child_bus, purge_pe);
-
-	pr_debug("PCI: Removing devices on bus %04x:%02x\n",
-		pci_domain_nr(bus),  bus->number);
-	list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
-		pr_debug("     * Removing %s...\n", pci_name(dev));
-		eeh_remove_bus_device(dev, purge_pe);
-		pci_stop_and_remove_bus_device(dev);
-	}
-}
-
-/**
- * pcibios_remove_pci_devices - remove all devices under this bus
- *
- * Remove all of the PCI devices under this bus both from the
- * linux pci device tree, and from the powerpc EEH address cache.
- */
-void pcibios_remove_pci_devices(struct pci_bus *bus)
-{
-	__pcibios_remove_pci_devices(bus, 1);
-}
-EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices);
-
-/**
- * pcibios_add_pci_devices - adds new pci devices to bus
- *
- * This routine will find and fixup new pci devices under
- * the indicated bus. This routine presumes that there
- * might already be some devices under this bridge, so
- * it carefully tries to add only new devices.  (And that
- * is how this routine differs from other, similar pcibios
- * routines.)
- */
-void pcibios_add_pci_devices(struct pci_bus * bus)
-{
-	int slotno, num, mode, pass, max;
-	struct pci_dev *dev;
-	struct device_node *dn = pci_bus_to_OF_node(bus);
-
-	eeh_add_device_tree_early(dn);
-
-	mode = PCI_PROBE_NORMAL;
-	if (ppc_md.pci_probe_mode)
-		mode = ppc_md.pci_probe_mode(bus);
-
-	if (mode == PCI_PROBE_DEVTREE) {
-		/* use ofdt-based probe */
-		of_rescan_bus(dn, bus);
-	} else if (mode == PCI_PROBE_NORMAL) {
-		/* use legacy probe */
-		slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
-		num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
-		if (!num)
-			return;
-		pcibios_setup_bus_devices(bus);
-		max = bus->busn_res.start;
-		for (pass=0; pass < 2; pass++)
-			list_for_each_entry(dev, &bus->devices, bus_list) {
-			if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
-			    dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
-				max = pci_scan_bridge(bus, dev, max, pass);
-		}
-	}
-	pcibios_finish_adding_to_bus(bus);
-}
-EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);
-
 struct pci_controller *init_phb_dynamic(struct device_node *dn)
 {
 	struct pci_controller *phb;