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, 552 deletions

diff --git a/arch/powerpc/platforms/pseries/eeh_driver.c b/arch/powerpc/platforms/pseries/eeh_driver.c
deleted file mode 100644
index 0acc5a2bdfc7..000000000000
--- a/arch/powerpc/platforms/pseries/eeh_driver.c
+++ /dev/null
@@ -1,552 +0,0 @@
-/*
- * PCI Error Recovery Driver for RPA-compliant PPC64 platform.
- * Copyright IBM Corp. 2004 2005
- * Copyright Linas Vepstas <linas@linas.org> 2004, 2005
- *
- * All rights reserved.
- *
- * 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, GOOD TITLE or
- * NON INFRINGEMENT.  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., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- * Send comments and feedback to Linas Vepstas <linas@austin.ibm.com>
- */
-#include <linux/delay.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/module.h>
-#include <linux/pci.h>
-#include <asm/eeh.h>
-#include <asm/eeh_event.h>
-#include <asm/ppc-pci.h>
-#include <asm/pci-bridge.h>
-#include <asm/prom.h>
-#include <asm/rtas.h>
-
-/**
- * eeh_pcid_name - Retrieve name of PCI device driver
- * @pdev: PCI device
- *
- * This routine is used to retrieve the name of PCI device driver
- * if that's valid.
- */
-static inline const char *eeh_pcid_name(struct pci_dev *pdev)
-{
-	if (pdev && pdev->dev.driver)
-		return pdev->dev.driver->name;
-	return "";
-}
-
-/**
- * eeh_pcid_get - Get the PCI device driver
- * @pdev: PCI device
- *
- * The function is used to retrieve the PCI device driver for
- * the indicated PCI device. Besides, we will increase the reference
- * of the PCI device driver to prevent that being unloaded on
- * the fly. Otherwise, kernel crash would be seen.
- */
-static inline struct pci_driver *eeh_pcid_get(struct pci_dev *pdev)
-{
-	if (!pdev || !pdev->driver)
-		return NULL;
-
-	if (!try_module_get(pdev->driver->driver.owner))
-		return NULL;
-
-	return pdev->driver;
-}
-
-/**
- * eeh_pcid_put - Dereference on the PCI device driver
- * @pdev: PCI device
- *
- * The function is called to do dereference on the PCI device
- * driver of the indicated PCI device.
- */
-static inline void eeh_pcid_put(struct pci_dev *pdev)
-{
-	if (!pdev || !pdev->driver)
-		return;
-
-	module_put(pdev->driver->driver.owner);
-}
-
-#if 0
-static void print_device_node_tree(struct pci_dn *pdn, int dent)
-{
-	int i;
-	struct device_node *pc;
-
-	if (!pdn)
-		return;
-	for (i = 0; i < dent; i++)
-		printk(" ");
-	printk("dn=%s mode=%x \tcfg_addr=%x pe_addr=%x \tfull=%s\n",
-		pdn->node->name, pdn->eeh_mode, pdn->eeh_config_addr,
-		pdn->eeh_pe_config_addr, pdn->node->full_name);
-	dent += 3;
-	pc = pdn->node->child;
-	while (pc) {
-		print_device_node_tree(PCI_DN(pc), dent);
-		pc = pc->sibling;
-	}
-}
-#endif
-
-/**
- * eeh_disable_irq - Disable interrupt for the recovering device
- * @dev: PCI device
- *
- * This routine must be called when reporting temporary or permanent
- * error to the particular PCI device to disable interrupt of that
- * device. If the device has enabled MSI or MSI-X interrupt, we needn't
- * do real work because EEH should freeze DMA transfers for those PCI
- * devices encountering EEH errors, which includes MSI or MSI-X.
- */
-static void eeh_disable_irq(struct pci_dev *dev)
-{
-	struct eeh_dev *edev = pci_dev_to_eeh_dev(dev);
-
-	/* Don't disable MSI and MSI-X interrupts. They are
-	 * effectively disabled by the DMA Stopped state
-	 * when an EEH error occurs.
-	 */
-	if (dev->msi_enabled || dev->msix_enabled)
-		return;
-
-	if (!irq_has_action(dev->irq))
-		return;
-
-	edev->mode |= EEH_DEV_IRQ_DISABLED;
-	disable_irq_nosync(dev->irq);
-}
-
-/**
- * eeh_enable_irq - Enable interrupt for the recovering device
- * @dev: PCI device
- *
- * This routine must be called to enable interrupt while failed
- * device could be resumed.
- */
-static void eeh_enable_irq(struct pci_dev *dev)
-{
-	struct eeh_dev *edev = pci_dev_to_eeh_dev(dev);
-
-	if ((edev->mode) & EEH_DEV_IRQ_DISABLED) {
-		edev->mode &= ~EEH_DEV_IRQ_DISABLED;
-		enable_irq(dev->irq);
-	}
-}
-
-/**
- * eeh_report_error - Report pci error to each device driver
- * @data: eeh device
- * @userdata: return value
- *
- * Report an EEH error to each device driver, collect up and
- * merge the device driver responses. Cumulative response
- * passed back in "userdata".
- */
-static void *eeh_report_error(void *data, void *userdata)
-{
-	struct eeh_dev *edev = (struct eeh_dev *)data;
-	struct pci_dev *dev = eeh_dev_to_pci_dev(edev);
-	enum pci_ers_result rc, *res = userdata;
-	struct pci_driver *driver;
-
-	/* We might not have the associated PCI device,
-	 * then we should continue for next one.
-	 */
-	if (!dev) return NULL;
-	dev->error_state = pci_channel_io_frozen;
-
-	driver = eeh_pcid_get(dev);
-	if (!driver) return NULL;
-
-	eeh_disable_irq(dev);
-
-	if (!driver->err_handler ||
-	    !driver->err_handler->error_detected) {
-		eeh_pcid_put(dev);
-		return NULL;
-	}
-
-	rc = driver->err_handler->error_detected(dev, pci_channel_io_frozen);
-
-	/* A driver that needs a reset trumps all others */
-	if (rc == PCI_ERS_RESULT_NEED_RESET) *res = rc;
-	if (*res == PCI_ERS_RESULT_NONE) *res = rc;
-
-	eeh_pcid_put(dev);
-	return NULL;
-}
-
-/**
- * eeh_report_mmio_enabled - Tell drivers that MMIO has been enabled
- * @data: eeh device
- * @userdata: return value
- *
- * Tells each device driver that IO ports, MMIO and config space I/O
- * are now enabled. Collects up and merges the device driver responses.
- * Cumulative response passed back in "userdata".
- */
-static void *eeh_report_mmio_enabled(void *data, void *userdata)
-{
-	struct eeh_dev *edev = (struct eeh_dev *)data;
-	struct pci_dev *dev = eeh_dev_to_pci_dev(edev);
-	enum pci_ers_result rc, *res = userdata;
-	struct pci_driver *driver;
-
-	driver = eeh_pcid_get(dev);
-	if (!driver) return NULL;
-
-	if (!driver->err_handler ||
-	    !driver->err_handler->mmio_enabled) {
-		eeh_pcid_put(dev);
-		return NULL;
-	}
-
-	rc = driver->err_handler->mmio_enabled(dev);
-
-	/* A driver that needs a reset trumps all others */
-	if (rc == PCI_ERS_RESULT_NEED_RESET) *res = rc;
-	if (*res == PCI_ERS_RESULT_NONE) *res = rc;
-
-	eeh_pcid_put(dev);
-	return NULL;
-}
-
-/**
- * eeh_report_reset - Tell device that slot has been reset
- * @data: eeh device
- * @userdata: return value
- *
- * This routine must be called while EEH tries to reset particular
- * PCI device so that the associated PCI device driver could take
- * some actions, usually to save data the driver needs so that the
- * driver can work again while the device is recovered.
- */
-static void *eeh_report_reset(void *data, void *userdata)
-{
-	struct eeh_dev *edev = (struct eeh_dev *)data;
-	struct pci_dev *dev = eeh_dev_to_pci_dev(edev);
-	enum pci_ers_result rc, *res = userdata;
-	struct pci_driver *driver;
-
-	if (!dev) return NULL;
-	dev->error_state = pci_channel_io_normal;
-
-	driver = eeh_pcid_get(dev);
-	if (!driver) return NULL;
-
-	eeh_enable_irq(dev);
-
-	if (!driver->err_handler ||
-	    !driver->err_handler->slot_reset) {
-		eeh_pcid_put(dev);
-		return NULL;
-	}
-
-	rc = driver->err_handler->slot_reset(dev);
-	if ((*res == PCI_ERS_RESULT_NONE) ||
-	    (*res == PCI_ERS_RESULT_RECOVERED)) *res = rc;
-	if (*res == PCI_ERS_RESULT_DISCONNECT &&
-	     rc == PCI_ERS_RESULT_NEED_RESET) *res = rc;
-
-	eeh_pcid_put(dev);
-	return NULL;
-}
-
-/**
- * eeh_report_resume - Tell device to resume normal operations
- * @data: eeh device
- * @userdata: return value
- *
- * This routine must be called to notify the device driver that it
- * could resume so that the device driver can do some initialization
- * to make the recovered device work again.
- */
-static void *eeh_report_resume(void *data, void *userdata)
-{
-	struct eeh_dev *edev = (struct eeh_dev *)data;
-	struct pci_dev *dev = eeh_dev_to_pci_dev(edev);
-	struct pci_driver *driver;
-
-	if (!dev) return NULL;
-	dev->error_state = pci_channel_io_normal;
-
-	driver = eeh_pcid_get(dev);
-	if (!driver) return NULL;
-
-	eeh_enable_irq(dev);
-
-	if (!driver->err_handler ||
-	    !driver->err_handler->resume) {
-		eeh_pcid_put(dev);
-		return NULL;
-	}
-
-	driver->err_handler->resume(dev);
-
-	eeh_pcid_put(dev);
-	return NULL;
-}
-
-/**
- * eeh_report_failure - Tell device driver that device is dead.
- * @data: eeh device
- * @userdata: return value
- *
- * This informs the device driver that the device is permanently
- * dead, and that no further recovery attempts will be made on it.
- */
-static void *eeh_report_failure(void *data, void *userdata)
-{
-	struct eeh_dev *edev = (struct eeh_dev *)data;
-	struct pci_dev *dev = eeh_dev_to_pci_dev(edev);
-	struct pci_driver *driver;
-
-	if (!dev) return NULL;
-	dev->error_state = pci_channel_io_perm_failure;
-
-	driver = eeh_pcid_get(dev);
-	if (!driver) return NULL;
-
-	eeh_disable_irq(dev);
-
-	if (!driver->err_handler ||
-	    !driver->err_handler->error_detected) {
-		eeh_pcid_put(dev);
-		return NULL;
-	}
-
-	driver->err_handler->error_detected(dev, pci_channel_io_perm_failure);
-
-	eeh_pcid_put(dev);
-	return NULL;
-}
-
-/**
- * eeh_reset_device - Perform actual reset of a pci slot
- * @pe: EEH PE
- * @bus: PCI bus corresponding to the isolcated slot
- *
- * This routine must be called to do reset on the indicated PE.
- * During the reset, udev might be invoked because those affected
- * PCI devices will be removed and then added.
- */
-static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus)
-{
-	int cnt, rc;
-
-	/* pcibios will clear the counter; save the value */
-	cnt = pe->freeze_count;
-
-	/*
-	 * We don't remove the corresponding PE instances because
-	 * we need the information afterwords. The attached EEH
-	 * devices are expected to be attached soon when calling
-	 * into pcibios_add_pci_devices().
-	 */
-	if (bus)
-		__pcibios_remove_pci_devices(bus, 0);
-
-	/* Reset the pci controller. (Asserts RST#; resets config space).
-	 * Reconfigure bridges and devices. Don't try to bring the system
-	 * up if the reset failed for some reason.
-	 */
-	rc = eeh_reset_pe(pe);
-	if (rc)
-		return rc;
-
-	/* Restore PE */
-	eeh_ops->configure_bridge(pe);
-	eeh_pe_restore_bars(pe);
-
-	/* Give the system 5 seconds to finish running the user-space
-	 * hotplug shutdown scripts, e.g. ifdown for ethernet.  Yes,
-	 * this is a hack, but if we don't do this, and try to bring
-	 * the device up before the scripts have taken it down,
-	 * potentially weird things happen.
-	 */
-	if (bus) {
-		ssleep(5);
-		pcibios_add_pci_devices(bus);
-	}
-	pe->freeze_count = cnt;
-
-	return 0;
-}
-
-/* The longest amount of time to wait for a pci device
- * to come back on line, in seconds.
- */
-#define MAX_WAIT_FOR_RECOVERY 150
-
-/**
- * eeh_handle_event - Reset a PCI device after hard lockup.
- * @pe: EEH PE
- *
- * While PHB detects address or data parity errors on particular PCI
- * slot, the associated PE will be frozen. Besides, DMA's occurring
- * to wild addresses (which usually happen due to bugs in device
- * drivers or in PCI adapter firmware) can cause EEH error. #SERR,
- * #PERR or other misc PCI-related errors also can trigger EEH errors.
- *
- * Recovery process consists of unplugging the device driver (which
- * generated hotplug events to userspace), then issuing a PCI #RST to
- * the device, then reconfiguring the PCI config space for all bridges
- * & devices under this slot, and then finally restarting the device
- * drivers (which cause a second set of hotplug events to go out to
- * userspace).
- */
-void eeh_handle_event(struct eeh_pe *pe)
-{
-	struct pci_bus *frozen_bus;
-	int rc = 0;
-	enum pci_ers_result result = PCI_ERS_RESULT_NONE;
-
-	frozen_bus = eeh_pe_bus_get(pe);
-	if (!frozen_bus) {
-		pr_err("%s: Cannot find PCI bus for PHB#%d-PE#%x\n",
-			__func__, pe->phb->global_number, pe->addr);
-		return;
-	}
-
-	pe->freeze_count++;
-	if (pe->freeze_count > EEH_MAX_ALLOWED_FREEZES)
-		goto excess_failures;
-	pr_warning("EEH: This PCI device has failed %d times in the last hour\n",
-		pe->freeze_count);
-
-	/* Walk the various device drivers attached to this slot through
-	 * a reset sequence, giving each an opportunity to do what it needs
-	 * to accomplish the reset.  Each child gets a report of the
-	 * status ... if any child can't handle the reset, then the entire
-	 * slot is dlpar removed and added.
-	 */
-	eeh_pe_dev_traverse(pe, eeh_report_error, &result);
-
-	/* Get the current PCI slot state. This can take a long time,
-	 * sometimes over 3 seconds for certain systems.
-	 */
-	rc = eeh_ops->wait_state(pe, MAX_WAIT_FOR_RECOVERY*1000);
-	if (rc < 0 || rc == EEH_STATE_NOT_SUPPORT) {
-		printk(KERN_WARNING "EEH: Permanent failure\n");
-		goto hard_fail;
-	}
-
-	/* Since rtas may enable MMIO when posting the error log,
-	 * don't post the error log until after all dev drivers
-	 * have been informed.
-	 */
-	eeh_slot_error_detail(pe, EEH_LOG_TEMP);
-
-	/* If all device drivers were EEH-unaware, then shut
-	 * down all of the device drivers, and hope they
-	 * go down willingly, without panicing the system.
-	 */
-	if (result == PCI_ERS_RESULT_NONE) {
-		rc = eeh_reset_device(pe, frozen_bus);
-		if (rc) {
-			printk(KERN_WARNING "EEH: Unable to reset, rc=%d\n", rc);
-			goto hard_fail;
-		}
-	}
-
-	/* If all devices reported they can proceed, then re-enable MMIO */
-	if (result == PCI_ERS_RESULT_CAN_RECOVER) {
-		rc = eeh_pci_enable(pe, EEH_OPT_THAW_MMIO);
-
-		if (rc < 0)
-			goto hard_fail;
-		if (rc) {
-			result = PCI_ERS_RESULT_NEED_RESET;
-		} else {
-			result = PCI_ERS_RESULT_NONE;
-			eeh_pe_dev_traverse(pe, eeh_report_mmio_enabled, &result);
-		}
-	}
-
-	/* If all devices reported they can proceed, then re-enable DMA */
-	if (result == PCI_ERS_RESULT_CAN_RECOVER) {
-		rc = eeh_pci_enable(pe, EEH_OPT_THAW_DMA);
-
-		if (rc < 0)
-			goto hard_fail;
-		if (rc)
-			result = PCI_ERS_RESULT_NEED_RESET;
-		else
-			result = PCI_ERS_RESULT_RECOVERED;
-	}
-
-	/* If any device has a hard failure, then shut off everything. */
-	if (result == PCI_ERS_RESULT_DISCONNECT) {
-		printk(KERN_WARNING "EEH: Device driver gave up\n");
-		goto hard_fail;
-	}
-
-	/* If any device called out for a reset, then reset the slot */
-	if (result == PCI_ERS_RESULT_NEED_RESET) {
-		rc = eeh_reset_device(pe, NULL);
-		if (rc) {
-			printk(KERN_WARNING "EEH: Cannot reset, rc=%d\n", rc);
-			goto hard_fail;
-		}
-		result = PCI_ERS_RESULT_NONE;
-		eeh_pe_dev_traverse(pe, eeh_report_reset, &result);
-	}
-
-	/* All devices should claim they have recovered by now. */
-	if ((result != PCI_ERS_RESULT_RECOVERED) &&
-	    (result != PCI_ERS_RESULT_NONE)) {
-		printk(KERN_WARNING "EEH: Not recovered\n");
-		goto hard_fail;
-	}
-
-	/* Tell all device drivers that they can resume operations */
-	eeh_pe_dev_traverse(pe, eeh_report_resume, NULL);
-
-	return;
-
-excess_failures:
-	/*
-	 * About 90% of all real-life EEH failures in the field
-	 * are due to poorly seated PCI cards. Only 10% or so are
-	 * due to actual, failed cards.
-	 */
-	pr_err("EEH: PHB#%d-PE#%x has failed %d times in the\n"
-	       "last hour and has been permanently disabled.\n"
-	       "Please try reseating or replacing it.\n",
-		pe->phb->global_number, pe->addr,
-		pe->freeze_count);
-	goto perm_error;
-
-hard_fail:
-	pr_err("EEH: Unable to recover from failure from PHB#%d-PE#%x.\n"
-	       "Please try reseating or replacing it\n",
-		pe->phb->global_number, pe->addr);
-
-perm_error:
-	eeh_slot_error_detail(pe, EEH_LOG_PERM);
-
-	/* Notify all devices that they're about to go down. */
-	eeh_pe_dev_traverse(pe, eeh_report_failure, NULL);
-
-	/* Shut down the device drivers for good. */
-	if (frozen_bus)
-		pcibios_remove_pci_devices(frozen_bus);
-}
-