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>

1 files changed, 0 insertions, 942 deletions

diff --git a/arch/powerpc/platforms/pseries/eeh.c b/arch/powerpc/platforms/pseries/eeh.c
deleted file mode 100644
index 8a8345193083..000000000000
--- a/arch/powerpc/platforms/pseries/eeh.c
+++ /dev/null
@@ -1,942 +0,0 @@
-/*
- * Copyright IBM Corporation 2001, 2005, 2006
- * Copyright Dave Engebretsen & Todd Inglett 2001
- * Copyright Linas Vepstas 2005, 2006
- * Copyright 2001-2012 IBM Corporation.
- *
- * 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.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
- *
- * Please address comments and feedback to Linas Vepstas <linas@austin.ibm.com>
- */
-
-#include <linux/delay.h>
-#include <linux/sched.h>
-#include <linux/init.h>
-#include <linux/list.h>
-#include <linux/pci.h>
-#include <linux/proc_fs.h>
-#include <linux/rbtree.h>
-#include <linux/seq_file.h>
-#include <linux/spinlock.h>
-#include <linux/export.h>
-#include <linux/of.h>
-
-#include <linux/atomic.h>
-#include <asm/eeh.h>
-#include <asm/eeh_event.h>
-#include <asm/io.h>
-#include <asm/machdep.h>
-#include <asm/ppc-pci.h>
-#include <asm/rtas.h>
-
-
-/** Overview:
- *  EEH, or "Extended Error Handling" is a PCI bridge technology for
- *  dealing with PCI bus errors that can't be dealt with within the
- *  usual PCI framework, except by check-stopping the CPU.  Systems
- *  that are designed for high-availability/reliability cannot afford
- *  to crash due to a "mere" PCI error, thus the need for EEH.
- *  An EEH-capable bridge operates by converting a detected error
- *  into a "slot freeze", taking the PCI adapter off-line, making
- *  the slot behave, from the OS'es point of view, as if the slot
- *  were "empty": all reads return 0xff's and all writes are silently
- *  ignored.  EEH slot isolation events can be triggered by parity
- *  errors on the address or data busses (e.g. during posted writes),
- *  which in turn might be caused by low voltage on the bus, dust,
- *  vibration, humidity, radioactivity or plain-old failed hardware.
- *
- *  Note, however, that one of the leading causes of EEH slot
- *  freeze events are buggy device drivers, buggy device microcode,
- *  or buggy device hardware.  This is because any attempt by the
- *  device to bus-master data to a memory address that is not
- *  assigned to the device will trigger a slot freeze.   (The idea
- *  is to prevent devices-gone-wild from corrupting system memory).
- *  Buggy hardware/drivers will have a miserable time co-existing
- *  with EEH.
- *
- *  Ideally, a PCI device driver, when suspecting that an isolation
- *  event has occurred (e.g. by reading 0xff's), will then ask EEH
- *  whether this is the case, and then take appropriate steps to
- *  reset the PCI slot, the PCI device, and then resume operations.
- *  However, until that day,  the checking is done here, with the
- *  eeh_check_failure() routine embedded in the MMIO macros.  If
- *  the slot is found to be isolated, an "EEH Event" is synthesized
- *  and sent out for processing.
- */
-
-/* If a device driver keeps reading an MMIO register in an interrupt
- * handler after a slot isolation event, it might be broken.
- * This sets the threshold for how many read attempts we allow
- * before printing an error message.
- */
-#define EEH_MAX_FAILS	2100000
-
-/* Time to wait for a PCI slot to report status, in milliseconds */
-#define PCI_BUS_RESET_WAIT_MSEC (60*1000)
-
-/* Platform dependent EEH operations */
-struct eeh_ops *eeh_ops = NULL;
-
-int eeh_subsystem_enabled;
-EXPORT_SYMBOL(eeh_subsystem_enabled);
-
-/*
- * EEH probe mode support. The intention is to support multiple
- * platforms for EEH. Some platforms like pSeries do PCI emunation
- * based on device tree. However, other platforms like powernv probe
- * PCI devices from hardware. The flag is used to distinguish that.
- * In addition, struct eeh_ops::probe would be invoked for particular
- * OF node or PCI device so that the corresponding PE would be created
- * there.
- */
-int eeh_probe_mode;
-
-/* Global EEH mutex */
-DEFINE_MUTEX(eeh_mutex);
-
-/* Lock to avoid races due to multiple reports of an error */
-static DEFINE_RAW_SPINLOCK(confirm_error_lock);
-
-/* Buffer for reporting pci register dumps. Its here in BSS, and
- * not dynamically alloced, so that it ends up in RMO where RTAS
- * can access it.
- */
-#define EEH_PCI_REGS_LOG_LEN 4096
-static unsigned char pci_regs_buf[EEH_PCI_REGS_LOG_LEN];
-
-/*
- * The struct is used to maintain the EEH global statistic
- * information. Besides, the EEH global statistics will be
- * exported to user space through procfs
- */
-struct eeh_stats {
-	u64 no_device;		/* PCI device not found		*/
-	u64 no_dn;		/* OF node not found		*/
-	u64 no_cfg_addr;	/* Config address not found	*/
-	u64 ignored_check;	/* EEH check skipped		*/
-	u64 total_mmio_ffs;	/* Total EEH checks		*/
-	u64 false_positives;	/* Unnecessary EEH checks	*/
-	u64 slot_resets;	/* PE reset			*/
-};
-
-static struct eeh_stats eeh_stats;
-
-#define IS_BRIDGE(class_code) (((class_code)<<16) == PCI_BASE_CLASS_BRIDGE)
-
-/**
- * eeh_gather_pci_data - Copy assorted PCI config space registers to buff
- * @edev: device to report data for
- * @buf: point to buffer in which to log
- * @len: amount of room in buffer
- *
- * This routine captures assorted PCI configuration space data,
- * and puts them into a buffer for RTAS error logging.
- */
-static size_t eeh_gather_pci_data(struct eeh_dev *edev, char * buf, size_t len)
-{
-	struct device_node *dn = eeh_dev_to_of_node(edev);
-	struct pci_dev *dev = eeh_dev_to_pci_dev(edev);
-	u32 cfg;
-	int cap, i;
-	int n = 0;
-
-	n += scnprintf(buf+n, len-n, "%s\n", dn->full_name);
-	printk(KERN_WARNING "EEH: of node=%s\n", dn->full_name);
-
-	eeh_ops->read_config(dn, PCI_VENDOR_ID, 4, &cfg);
-	n += scnprintf(buf+n, len-n, "dev/vend:%08x\n", cfg);
-	printk(KERN_WARNING "EEH: PCI device/vendor: %08x\n", cfg);
-
-	eeh_ops->read_config(dn, PCI_COMMAND, 4, &cfg);
-	n += scnprintf(buf+n, len-n, "cmd/stat:%x\n", cfg);
-	printk(KERN_WARNING "EEH: PCI cmd/status register: %08x\n", cfg);
-
-	if (!dev) {
-		printk(KERN_WARNING "EEH: no PCI device for this of node\n");
-		return n;
-	}
-
-	/* Gather bridge-specific registers */
-	if (dev->class >> 16 == PCI_BASE_CLASS_BRIDGE) {
-		eeh_ops->read_config(dn, PCI_SEC_STATUS, 2, &cfg);
-		n += scnprintf(buf+n, len-n, "sec stat:%x\n", cfg);
-		printk(KERN_WARNING "EEH: Bridge secondary status: %04x\n", cfg);
-
-		eeh_ops->read_config(dn, PCI_BRIDGE_CONTROL, 2, &cfg);
-		n += scnprintf(buf+n, len-n, "brdg ctl:%x\n", cfg);
-		printk(KERN_WARNING "EEH: Bridge control: %04x\n", cfg);
-	}
-
-	/* Dump out the PCI-X command and status regs */
-	cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
-	if (cap) {
-		eeh_ops->read_config(dn, cap, 4, &cfg);
-		n += scnprintf(buf+n, len-n, "pcix-cmd:%x\n", cfg);
-		printk(KERN_WARNING "EEH: PCI-X cmd: %08x\n", cfg);
-
-		eeh_ops->read_config(dn, cap+4, 4, &cfg);
-		n += scnprintf(buf+n, len-n, "pcix-stat:%x\n", cfg);
-		printk(KERN_WARNING "EEH: PCI-X status: %08x\n", cfg);
-	}
-
-	/* If PCI-E capable, dump PCI-E cap 10, and the AER */
-	cap = pci_find_capability(dev, PCI_CAP_ID_EXP);
-	if (cap) {
-		n += scnprintf(buf+n, len-n, "pci-e cap10:\n");
-		printk(KERN_WARNING
-		       "EEH: PCI-E capabilities and status follow:\n");
-
-		for (i=0; i<=8; i++) {
-			eeh_ops->read_config(dn, cap+4*i, 4, &cfg);
-			n += scnprintf(buf+n, len-n, "%02x:%x\n", 4*i, cfg);
-			printk(KERN_WARNING "EEH: PCI-E %02x: %08x\n", i, cfg);
-		}
-
-		cap = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
-		if (cap) {
-			n += scnprintf(buf+n, len-n, "pci-e AER:\n");
-			printk(KERN_WARNING
-			       "EEH: PCI-E AER capability register set follows:\n");
-
-			for (i=0; i<14; i++) {
-				eeh_ops->read_config(dn, cap+4*i, 4, &cfg);
-				n += scnprintf(buf+n, len-n, "%02x:%x\n", 4*i, cfg);
-				printk(KERN_WARNING "EEH: PCI-E AER %02x: %08x\n", i, cfg);
-			}
-		}
-	}
-
-	return n;
-}
-
-/**
- * eeh_slot_error_detail - Generate combined log including driver log and error log
- * @pe: EEH PE
- * @severity: temporary or permanent error log
- *
- * This routine should be called to generate the combined log, which
- * is comprised of driver log and error log. The driver log is figured
- * out from the config space of the corresponding PCI device, while
- * the error log is fetched through platform dependent function call.
- */
-void eeh_slot_error_detail(struct eeh_pe *pe, int severity)
-{
-	size_t loglen = 0;
-	struct eeh_dev *edev;
-
-	eeh_pci_enable(pe, EEH_OPT_THAW_MMIO);
-	eeh_ops->configure_bridge(pe);
-	eeh_pe_restore_bars(pe);
-
-	pci_regs_buf[0] = 0;
-	eeh_pe_for_each_dev(pe, edev) {
-		loglen += eeh_gather_pci_data(edev, pci_regs_buf,
-				EEH_PCI_REGS_LOG_LEN);
-        }
-
-	eeh_ops->get_log(pe, severity, pci_regs_buf, loglen);
-}
-
-/**
- * eeh_token_to_phys - Convert EEH address token to phys address
- * @token: I/O token, should be address in the form 0xA....
- *
- * This routine should be called to convert virtual I/O address
- * to physical one.
- */
-static inline unsigned long eeh_token_to_phys(unsigned long token)
-{
-	pte_t *ptep;
-	unsigned long pa;
-
-	ptep = find_linux_pte(init_mm.pgd, token);
-	if (!ptep)
-		return token;
-	pa = pte_pfn(*ptep) << PAGE_SHIFT;
-
-	return pa | (token & (PAGE_SIZE-1));
-}
-
-/**
- * eeh_dev_check_failure - Check if all 1's data is due to EEH slot freeze
- * @edev: eeh device
- *
- * Check for an EEH failure for the given device node.  Call this
- * routine if the result of a read was all 0xff's and you want to
- * find out if this is due to an EEH slot freeze.  This routine
- * will query firmware for the EEH status.
- *
- * Returns 0 if there has not been an EEH error; otherwise returns
- * a non-zero value and queues up a slot isolation event notification.
- *
- * It is safe to call this routine in an interrupt context.
- */
-int eeh_dev_check_failure(struct eeh_dev *edev)
-{
-	int ret;
-	unsigned long flags;
-	struct device_node *dn;
-	struct pci_dev *dev;
-	struct eeh_pe *pe;
-	int rc = 0;
-	const char *location;
-
-	eeh_stats.total_mmio_ffs++;
-
-	if (!eeh_subsystem_enabled)
-		return 0;
-
-	if (!edev) {
-		eeh_stats.no_dn++;
-		return 0;
-	}
-	dn = eeh_dev_to_of_node(edev);
-	dev = eeh_dev_to_pci_dev(edev);
-	pe = edev->pe;
-
-	/* Access to IO BARs might get this far and still not want checking. */
-	if (!pe) {
-		eeh_stats.ignored_check++;
-		pr_debug("EEH: Ignored check for %s %s\n",
-			eeh_pci_name(dev), dn->full_name);
-		return 0;
-	}
-
-	if (!pe->addr && !pe->config_addr) {
-		eeh_stats.no_cfg_addr++;
-		return 0;
-	}
-
-	/* If we already have a pending isolation event for this
-	 * slot, we know it's bad already, we don't need to check.
-	 * Do this checking under a lock; as multiple PCI devices
-	 * in one slot might report errors simultaneously, and we
-	 * only want one error recovery routine running.
-	 */
-	raw_spin_lock_irqsave(&confirm_error_lock, flags);
-	rc = 1;
-	if (pe->state & EEH_PE_ISOLATED) {
-		pe->check_count++;
-		if (pe->check_count % EEH_MAX_FAILS == 0) {
-			location = of_get_property(dn, "ibm,loc-code", NULL);
-			printk(KERN_ERR "EEH: %d reads ignored for recovering device at "
-				"location=%s driver=%s pci addr=%s\n",
-				pe->check_count, location,
-				eeh_driver_name(dev), eeh_pci_name(dev));
-			printk(KERN_ERR "EEH: Might be infinite loop in %s driver\n",
-				eeh_driver_name(dev));
-			dump_stack();
-		}
-		goto dn_unlock;
-	}
-
-	/*
-	 * Now test for an EEH failure.  This is VERY expensive.
-	 * Note that the eeh_config_addr may be a parent device
-	 * in the case of a device behind a bridge, or it may be
-	 * function zero of a multi-function device.
-	 * In any case they must share a common PHB.
-	 */
-	ret = eeh_ops->get_state(pe, NULL);
-
-	/* Note that config-io to empty slots may fail;
-	 * they are empty when they don't have children.
-	 * We will punt with the following conditions: Failure to get
-	 * PE's state, EEH not support and Permanently unavailable
-	 * state, PE is in good state.
-	 */
-	if ((ret < 0) ||
-	    (ret == EEH_STATE_NOT_SUPPORT) ||
-	    (ret & (EEH_STATE_MMIO_ACTIVE | EEH_STATE_DMA_ACTIVE)) ==
-	    (EEH_STATE_MMIO_ACTIVE | EEH_STATE_DMA_ACTIVE)) {
-		eeh_stats.false_positives++;
-		pe->false_positives++;
-		rc = 0;
-		goto dn_unlock;
-	}
-
-	eeh_stats.slot_resets++;
-
-	/* Avoid repeated reports of this failure, including problems
-	 * with other functions on this device, and functions under
-	 * bridges.
-	 */
-	eeh_pe_state_mark(pe, EEH_PE_ISOLATED);
-	raw_spin_unlock_irqrestore(&confirm_error_lock, flags);
-
-	eeh_send_failure_event(pe);
-
-	/* Most EEH events are due to device driver bugs.  Having
-	 * a stack trace will help the device-driver authors figure
-	 * out what happened.  So print that out.
-	 */
-	WARN(1, "EEH: failure detected\n");
-	return 1;
-
-dn_unlock:
-	raw_spin_unlock_irqrestore(&confirm_error_lock, flags);
-	return rc;
-}
-
-EXPORT_SYMBOL_GPL(eeh_dev_check_failure);
-
-/**
- * eeh_check_failure - Check if all 1's data is due to EEH slot freeze
- * @token: I/O token, should be address in the form 0xA....
- * @val: value, should be all 1's (XXX why do we need this arg??)
- *
- * Check for an EEH failure at the given token address.  Call this
- * routine if the result of a read was all 0xff's and you want to
- * find out if this is due to an EEH slot freeze event.  This routine
- * will query firmware for the EEH status.
- *
- * Note this routine is safe to call in an interrupt context.
- */
-unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned long val)
-{
-	unsigned long addr;
-	struct eeh_dev *edev;
-
-	/* Finding the phys addr + pci device; this is pretty quick. */
-	addr = eeh_token_to_phys((unsigned long __force) token);
-	edev = eeh_addr_cache_get_dev(addr);
-	if (!edev) {
-		eeh_stats.no_device++;
-		return val;
-	}
-
-	eeh_dev_check_failure(edev);
-
-	pci_dev_put(eeh_dev_to_pci_dev(edev));
-	return val;
-}
-
-EXPORT_SYMBOL(eeh_check_failure);
-
-
-/**
- * eeh_pci_enable - Enable MMIO or DMA transfers for this slot
- * @pe: EEH PE
- *
- * This routine should be called to reenable frozen MMIO or DMA
- * so that it would work correctly again. It's useful while doing
- * recovery or log collection on the indicated device.
- */
-int eeh_pci_enable(struct eeh_pe *pe, int function)
-{
-	int rc;
-
-	rc = eeh_ops->set_option(pe, function);
-	if (rc)
-		pr_warning("%s: Unexpected state change %d on PHB#%d-PE#%x, err=%d\n",
-			__func__, function, pe->phb->global_number, pe->addr, rc);
-
-	rc = eeh_ops->wait_state(pe, PCI_BUS_RESET_WAIT_MSEC);
-	if (rc > 0 && (rc & EEH_STATE_MMIO_ENABLED) &&
-	   (function == EEH_OPT_THAW_MMIO))
-		return 0;
-
-	return rc;
-}
-
-/**
- * pcibios_set_pcie_slot_reset - Set PCI-E reset state
- * @dev: pci device struct
- * @state: reset state to enter
- *
- * Return value:
- * 	0 if success
- */
-int pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state)
-{
-	struct eeh_dev *edev = pci_dev_to_eeh_dev(dev);
-	struct eeh_pe *pe = edev->pe;
-
-	if (!pe) {
-		pr_err("%s: No PE found on PCI device %s\n",
-			__func__, pci_name(dev));
-		return -EINVAL;
-	}
-
-	switch (state) {
-	case pcie_deassert_reset:
-		eeh_ops->reset(pe, EEH_RESET_DEACTIVATE);
-		break;
-	case pcie_hot_reset:
-		eeh_ops->reset(pe, EEH_RESET_HOT);
-		break;
-	case pcie_warm_reset:
-		eeh_ops->reset(pe, EEH_RESET_FUNDAMENTAL);
-		break;
-	default:
-		return -EINVAL;
-	};
-
-	return 0;
-}
-
-/**
- * eeh_set_pe_freset - Check the required reset for the indicated device
- * @data: EEH device
- * @flag: return value
- *
- * Each device might have its preferred reset type: fundamental or
- * hot reset. The routine is used to collected the information for
- * the indicated device and its children so that the bunch of the
- * devices could be reset properly.
- */
-static void *eeh_set_dev_freset(void *data, void *flag)
-{
-	struct pci_dev *dev;
-	unsigned int *freset = (unsigned int *)flag;
-	struct eeh_dev *edev = (struct eeh_dev *)data;
-
-	dev = eeh_dev_to_pci_dev(edev);
-	if (dev)
-		*freset |= dev->needs_freset;
-
-	return NULL;
-}
-
-/**
- * eeh_reset_pe_once - Assert the pci #RST line for 1/4 second
- * @pe: EEH PE
- *
- * Assert the PCI #RST line for 1/4 second.
- */
-static void eeh_reset_pe_once(struct eeh_pe *pe)
-{
-	unsigned int freset = 0;
-
-	/* Determine type of EEH reset required for
-	 * Partitionable Endpoint, a hot-reset (1)
-	 * or a fundamental reset (3).
-	 * A fundamental reset required by any device under
-	 * Partitionable Endpoint trumps hot-reset.
-	 */
-	eeh_pe_dev_traverse(pe, eeh_set_dev_freset, &freset);
-
-	if (freset)
-		eeh_ops->reset(pe, EEH_RESET_FUNDAMENTAL);
-	else
-		eeh_ops->reset(pe, EEH_RESET_HOT);
-
-	/* The PCI bus requires that the reset be held high for at least
-	 * a 100 milliseconds. We wait a bit longer 'just in case'.
-	 */
-#define PCI_BUS_RST_HOLD_TIME_MSEC 250
-	msleep(PCI_BUS_RST_HOLD_TIME_MSEC);
-
-	/* We might get hit with another EEH freeze as soon as the
-	 * pci slot reset line is dropped. Make sure we don't miss
-	 * these, and clear the flag now.
-	 */
-	eeh_pe_state_clear(pe, EEH_PE_ISOLATED);
-
-	eeh_ops->reset(pe, EEH_RESET_DEACTIVATE);
-
-	/* After a PCI slot has been reset, the PCI Express spec requires
-	 * a 1.5 second idle time for the bus to stabilize, before starting
-	 * up traffic.
-	 */
-#define PCI_BUS_SETTLE_TIME_MSEC 1800
-	msleep(PCI_BUS_SETTLE_TIME_MSEC);
-}
-
-/**
- * eeh_reset_pe - Reset the indicated PE
- * @pe: EEH PE
- *
- * This routine should be called to reset indicated device, including
- * PE. A PE might include multiple PCI devices and sometimes PCI bridges
- * might be involved as well.
- */
-int eeh_reset_pe(struct eeh_pe *pe)
-{
-	int i, rc;
-
-	/* Take three shots at resetting the bus */
-	for (i=0; i<3; i++) {
-		eeh_reset_pe_once(pe);
-
-		rc = eeh_ops->wait_state(pe, PCI_BUS_RESET_WAIT_MSEC);
-		if (rc == (EEH_STATE_MMIO_ACTIVE | EEH_STATE_DMA_ACTIVE))
-			return 0;
-
-		if (rc < 0) {
-			pr_err("%s: Unrecoverable slot failure on PHB#%d-PE#%x",
-				__func__, pe->phb->global_number, pe->addr);
-			return -1;
-		}
-		pr_err("EEH: bus reset %d failed on PHB#%d-PE#%x, rc=%d\n",
-			i+1, pe->phb->global_number, pe->addr, rc);
-	}
-
-	return -1;
-}
-
-/**
- * eeh_save_bars - Save device bars
- * @edev: PCI device associated EEH device
- *
- * Save the values of the device bars. Unlike the restore
- * routine, this routine is *not* recursive. This is because
- * PCI devices are added individually; but, for the restore,
- * an entire slot is reset at a time.
- */
-void eeh_save_bars(struct eeh_dev *edev)
-{
-	int i;
-	struct device_node *dn;
-
-	if (!edev)
-		return;
-	dn = eeh_dev_to_of_node(edev);
-
-	for (i = 0; i < 16; i++)
-		eeh_ops->read_config(dn, i * 4, 4, &edev->config_space[i]);
-}
-
-/**
- * eeh_ops_register - Register platform dependent EEH operations
- * @ops: platform dependent EEH operations
- *
- * Register the platform dependent EEH operation callback
- * functions. The platform should call this function before
- * any other EEH operations.
- */
-int __init eeh_ops_register(struct eeh_ops *ops)
-{
-	if (!ops->name) {
-		pr_warning("%s: Invalid EEH ops name for %p\n",
-			__func__, ops);
-		return -EINVAL;
-	}
-
-	if (eeh_ops && eeh_ops != ops) {
-		pr_warning("%s: EEH ops of platform %s already existing (%s)\n",
-			__func__, eeh_ops->name, ops->name);
-		return -EEXIST;
-	}
-
-	eeh_ops = ops;
-
-	return 0;
-}
-
-/**
- * eeh_ops_unregister - Unreigster platform dependent EEH operations
- * @name: name of EEH platform operations
- *
- * Unregister the platform dependent EEH operation callback
- * functions.
- */
-int __exit eeh_ops_unregister(const char *name)
-{
-	if (!name || !strlen(name)) {
-		pr_warning("%s: Invalid EEH ops name\n",
-			__func__);
-		return -EINVAL;
-	}
-
-	if (eeh_ops && !strcmp(eeh_ops->name, name)) {
-		eeh_ops = NULL;
-		return 0;
-	}
-
-	return -EEXIST;
-}
-
-/**
- * eeh_init - EEH initialization
- *
- * Initialize EEH by trying to enable it for all of the adapters in the system.
- * As a side effect we can determine here if eeh is supported at all.
- * Note that we leave EEH on so failed config cycles won't cause a machine
- * check.  If a user turns off EEH for a particular adapter they are really
- * telling Linux to ignore errors.  Some hardware (e.g. POWER5) won't
- * grant access to a slot if EEH isn't enabled, and so we always enable
- * EEH for all slots/all devices.
- *
- * The eeh-force-off option disables EEH checking globally, for all slots.
- * Even if force-off is set, the EEH hardware is still enabled, so that
- * newer systems can boot.
- */
-static int __init eeh_init(void)
-{
-	struct pci_controller *hose, *tmp;
-	struct device_node *phb;
-	int ret;
-
-	/* call platform initialization function */
-	if (!eeh_ops) {
-		pr_warning("%s: Platform EEH operation not found\n",
-			__func__);
-		return -EEXIST;
-	} else if ((ret = eeh_ops->init())) {
-		pr_warning("%s: Failed to call platform init function (%d)\n",
-			__func__, ret);
-		return ret;
-	}
-
-	raw_spin_lock_init(&confirm_error_lock);
-
-	/* Enable EEH for all adapters */
-	if (eeh_probe_mode_devtree()) {
-		list_for_each_entry_safe(hose, tmp,
-			&hose_list, list_node) {
-			phb = hose->dn;
-			traverse_pci_devices(phb, eeh_ops->of_probe, NULL);
-		}
-	}
-
-	if (eeh_subsystem_enabled)
-		pr_info("EEH: PCI Enhanced I/O Error Handling Enabled\n");
-	else
-		pr_warning("EEH: No capable adapters found\n");
-
-	return ret;
-}
-
-core_initcall_sync(eeh_init);
-
-/**
- * eeh_add_device_early - Enable EEH for the indicated device_node
- * @dn: device node for which to set up EEH
- *
- * This routine must be used to perform EEH initialization for PCI
- * devices that were added after system boot (e.g. hotplug, dlpar).
- * This routine must be called before any i/o is performed to the
- * adapter (inluding any config-space i/o).
- * Whether this actually enables EEH or not for this device depends
- * on the CEC architecture, type of the device, on earlier boot
- * command-line arguments & etc.
- */
-static void eeh_add_device_early(struct device_node *dn)
-{
-	struct pci_controller *phb;
-
-	if (!of_node_to_eeh_dev(dn))
-		return;
-	phb = of_node_to_eeh_dev(dn)->phb;
-
-	/* USB Bus children of PCI devices will not have BUID's */
-	if (NULL == phb || 0 == phb->buid)
-		return;
-
-	/* FIXME: hotplug support on POWERNV */
-	eeh_ops->of_probe(dn, NULL);
-}
-
-/**
- * eeh_add_device_tree_early - Enable EEH for the indicated device
- * @dn: device node
- *
- * This routine must be used to perform EEH initialization for the
- * indicated PCI device that was added after system boot (e.g.
- * hotplug, dlpar).
- */
-void eeh_add_device_tree_early(struct device_node *dn)
-{
-	struct device_node *sib;
-
-	for_each_child_of_node(dn, sib)
-		eeh_add_device_tree_early(sib);
-	eeh_add_device_early(dn);
-}
-EXPORT_SYMBOL_GPL(eeh_add_device_tree_early);
-
-/**
- * eeh_add_device_late - Perform EEH initialization for the indicated pci device
- * @dev: pci device for which to set up EEH
- *
- * This routine must be used to complete EEH initialization for PCI
- * devices that were added after system boot (e.g. hotplug, dlpar).
- */
-static void eeh_add_device_late(struct pci_dev *dev)
-{
-	struct device_node *dn;
-	struct eeh_dev *edev;
-
-	if (!dev || !eeh_subsystem_enabled)
-		return;
-
-	pr_debug("EEH: Adding device %s\n", pci_name(dev));
-
-	dn = pci_device_to_OF_node(dev);
-	edev = of_node_to_eeh_dev(dn);
-	if (edev->pdev == dev) {
-		pr_debug("EEH: Already referenced !\n");
-		return;
-	}
-	WARN_ON(edev->pdev);
-
-	pci_dev_get(dev);
-	edev->pdev = dev;
-	dev->dev.archdata.edev = edev;
-
-	eeh_addr_cache_insert_dev(dev);
-}
-
-/**
- * eeh_add_device_tree_late - Perform EEH initialization for the indicated PCI bus
- * @bus: PCI bus
- *
- * This routine must be used to perform EEH initialization for PCI
- * devices which are attached to the indicated PCI bus. The PCI bus
- * is added after system boot through hotplug or dlpar.
- */
-void eeh_add_device_tree_late(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)
-				eeh_add_device_tree_late(subbus);
-		}
-	}
-}
-EXPORT_SYMBOL_GPL(eeh_add_device_tree_late);
-
-/**
- * eeh_add_sysfs_files - Add EEH sysfs files for the indicated PCI bus
- * @bus: PCI bus
- *
- * This routine must be used to add EEH sysfs files for PCI
- * devices which are attached to the indicated PCI bus. The PCI bus
- * is added after system boot through hotplug or dlpar.
- */
-void eeh_add_sysfs_files(struct pci_bus *bus)
-{
-	struct pci_dev *dev;
-
-	list_for_each_entry(dev, &bus->devices, bus_list) {
-		eeh_sysfs_add_device(dev);
-		if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
-			struct pci_bus *subbus = dev->subordinate;
-			if (subbus)
-				eeh_add_sysfs_files(subbus);
-		}
-	}
-}
-EXPORT_SYMBOL_GPL(eeh_add_sysfs_files);
-
-/**
- * eeh_remove_device - Undo EEH setup for the indicated pci device
- * @dev: pci device to be removed
- * @purge_pe: remove the PE or not
- *
- * This routine should be called when a device is removed from
- * a running system (e.g. by hotplug or dlpar).  It unregisters
- * the PCI device from the EEH subsystem.  I/O errors affecting
- * this device will no longer be detected after this call; thus,
- * i/o errors affecting this slot may leave this device unusable.
- */
-static void eeh_remove_device(struct pci_dev *dev, int purge_pe)
-{
-	struct eeh_dev *edev;
-
-	if (!dev || !eeh_subsystem_enabled)
-		return;
-	edev = pci_dev_to_eeh_dev(dev);
-
-	/* Unregister the device with the EEH/PCI address search system */
-	pr_debug("EEH: Removing device %s\n", pci_name(dev));
-
-	if (!edev || !edev->pdev) {
-		pr_debug("EEH: Not referenced !\n");
-		return;
-	}
-	edev->pdev = NULL;
-	dev->dev.archdata.edev = NULL;
-	pci_dev_put(dev);
-
-	eeh_rmv_from_parent_pe(edev, purge_pe);
-	eeh_addr_cache_rmv_dev(dev);
-	eeh_sysfs_remove_device(dev);
-}
-
-/**
- * eeh_remove_bus_device - Undo EEH setup for the indicated PCI device
- * @dev: PCI device
- * @purge_pe: remove the corresponding PE or not
- *
- * This routine must be called when a device is removed from the
- * running system through hotplug or dlpar. The corresponding
- * PCI address cache will be removed.
- */
-void eeh_remove_bus_device(struct pci_dev *dev, int purge_pe)
-{
-	struct pci_bus *bus = dev->subordinate;
-	struct pci_dev *child, *tmp;
-
-	eeh_remove_device(dev, purge_pe);
-
-	if (bus && dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
-		list_for_each_entry_safe(child, tmp, &bus->devices, bus_list)
-			 eeh_remove_bus_device(child, purge_pe);
-	}
-}
-EXPORT_SYMBOL_GPL(eeh_remove_bus_device);
-
-static int proc_eeh_show(struct seq_file *m, void *v)
-{
-	if (0 == eeh_subsystem_enabled) {
-		seq_printf(m, "EEH Subsystem is globally disabled\n");
-		seq_printf(m, "eeh_total_mmio_ffs=%llu\n", eeh_stats.total_mmio_ffs);
-	} else {
-		seq_printf(m, "EEH Subsystem is enabled\n");
-		seq_printf(m,
-				"no device=%llu\n"
-				"no device node=%llu\n"
-				"no config address=%llu\n"
-				"check not wanted=%llu\n"
-				"eeh_total_mmio_ffs=%llu\n"
-				"eeh_false_positives=%llu\n"
-				"eeh_slot_resets=%llu\n",
-				eeh_stats.no_device,
-				eeh_stats.no_dn,
-				eeh_stats.no_cfg_addr,
-				eeh_stats.ignored_check,
-				eeh_stats.total_mmio_ffs,
-				eeh_stats.false_positives,
-				eeh_stats.slot_resets);
-	}
-
-	return 0;
-}
-
-static int proc_eeh_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, proc_eeh_show, NULL);
-}
-
-static const struct file_operations proc_eeh_operations = {
-	.open      = proc_eeh_open,
-	.read      = seq_read,
-	.llseek    = seq_lseek,
-	.release   = single_release,
-};
-
-static int __init eeh_init_proc(void)
-{
-	if (machine_is(pseries))
-		proc_create("powerpc/eeh", 0, NULL, &proc_eeh_operations);
-	return 0;
-}
-__initcall(eeh_init_proc);