PCI-Express AER implemetation: AER core and aerdriver
Zhang, Yanmin [Mon, 31 Jul 2006 07:21:33 +0000 (15:21 +0800)]
Patch 3 implements the core part of PCI-Express AER and aerdrv
port service driver.

When a root port service device is probed, the aerdrv will call
request_irq to register irq handler for AER error interrupt.

When a device sends an PCI-Express error message to the root port,
the root port will trigger an interrupt, by either MSI or IO-APIC,
then kernel would run the irq handler. The handler collects root
error status register and schedules a work. The work will call
the core part to process the error based on its type
(Correctable/non-fatal/fatal).

As for Correctable errors, the patch chooses to just clear the correctable
error status register of the device.

As for the non-fatal error, the patch follows generic PCI error handler
rules to call the error callback functions of the endpoint's driver. If
the device is a bridge, the patch chooses to broadcast the error to
downstream devices.

As for the fatal error, the patch resets the pci-express link and
follows generic PCI error handler rules to call the error callback
functions of the endpoint's driver. If the device is a bridge, the patch
chooses to broadcast the error to downstream devices.

Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/pci/pcie/Kconfig
drivers/pci/pcie/Makefile
drivers/pci/pcie/aer/Kconfig [new file with mode: 0644]
drivers/pci/pcie/aer/Makefile [new file with mode: 0644]
drivers/pci/pcie/aer/aerdrv.c [new file with mode: 0644]
drivers/pci/pcie/aer/aerdrv.h [new file with mode: 0644]
drivers/pci/pcie/aer/aerdrv_acpi.c [new file with mode: 0644]
drivers/pci/pcie/aer/aerdrv_core.c [new file with mode: 0644]
drivers/pci/pcie/aer/aerdrv_errprint.c [new file with mode: 0644]
include/linux/aer.h [new file with mode: 0644]
include/linux/pcieport_if.h

index 1012db8..0ad92a8 100644 (file)
@@ -34,3 +34,4 @@ config HOTPLUG_PCI_PCIE_POLL_EVENT_MODE
           
          When in doubt, say N.
 
+source "drivers/pci/pcie/aer/Kconfig"
index 984fa87..e00fb99 100644 (file)
@@ -5,3 +5,6 @@
 pcieportdrv-y                  := portdrv_core.o portdrv_pci.o portdrv_bus.o
 
 obj-$(CONFIG_PCIEPORTBUS)      += pcieportdrv.o
+
+# Build PCI Express AER if needed
+obj-$(CONFIG_PCIEAER)          += aer/
diff --git a/drivers/pci/pcie/aer/Kconfig b/drivers/pci/pcie/aer/Kconfig
new file mode 100644 (file)
index 0000000..3f37a60
--- /dev/null
@@ -0,0 +1,12 @@
+#
+# PCI Express Root Port Device AER Configuration
+#
+
+config PCIEAER
+       boolean "Root Port Advanced Error Reporting support"
+       depends on PCIEPORTBUS && ACPI
+       default y
+       help
+         This enables PCI Express Root Port Advanced Error Reporting
+         (AER) driver support. Error reporting messages sent to Root
+         Port will be handled by PCI Express AER driver.
diff --git a/drivers/pci/pcie/aer/Makefile b/drivers/pci/pcie/aer/Makefile
new file mode 100644 (file)
index 0000000..15a4f40
--- /dev/null
@@ -0,0 +1,8 @@
+#
+# Makefile for PCI-Express Root Port Advanced Error Reporting Driver
+#
+
+obj-$(CONFIG_PCIEAER) += aerdriver.o
+
+aerdriver-objs := aerdrv_errprint.o aerdrv_core.o aerdrv.o aerdrv_acpi.o
+
diff --git a/drivers/pci/pcie/aer/aerdrv.c b/drivers/pci/pcie/aer/aerdrv.c
new file mode 100644 (file)
index 0000000..0d4ac02
--- /dev/null
@@ -0,0 +1,346 @@
+/*
+ * drivers/pci/pcie/aer/aerdrv.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * This file implements the AER root port service driver. The driver will
+ * register an irq handler. When root port triggers an AER interrupt, the irq
+ * handler will collect root port status and schedule a work.
+ *
+ * Copyright (C) 2006 Intel Corp.
+ *     Tom Long Nguyen (tom.l.nguyen@intel.com)
+ *     Zhang Yanmin (yanmin.zhang@intel.com)
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/pm.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/pcieport_if.h>
+
+#include "aerdrv.h"
+
+/*
+ * Version Information
+ */
+#define DRIVER_VERSION "v1.0"
+#define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
+#define DRIVER_DESC "Root Port Advanced Error Reporting Driver"
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+static int __devinit aer_probe (struct pcie_device *dev,
+       const struct pcie_port_service_id *id );
+static void aer_remove(struct pcie_device *dev);
+static int aer_suspend(struct pcie_device *dev, pm_message_t state)
+{return 0;}
+static int aer_resume(struct pcie_device *dev) {return 0;}
+static pci_ers_result_t aer_error_detected(struct pci_dev *dev,
+       enum pci_channel_state error);
+static void aer_error_resume(struct pci_dev *dev);
+static pci_ers_result_t aer_root_reset(struct pci_dev *dev);
+
+/*
+ * PCI Express bus's AER Root service driver data structure
+ */
+static struct pcie_port_service_id aer_id[] = {
+       {
+       .vendor         = PCI_ANY_ID,
+       .device         = PCI_ANY_ID,
+       .port_type      = PCIE_RC_PORT,
+       .service_type   = PCIE_PORT_SERVICE_AER,
+       },
+       { /* end: all zeroes */ }
+};
+
+static struct pci_error_handlers aer_error_handlers = {
+       .error_detected = aer_error_detected,
+       .resume = aer_error_resume,
+};
+
+static struct pcie_port_service_driver aerdrv = {
+       .name           = "aer",
+       .id_table       = &aer_id[0],
+
+       .probe          = aer_probe,
+       .remove         = aer_remove,
+
+       .suspend        = aer_suspend,
+       .resume         = aer_resume,
+
+       .err_handler    = &aer_error_handlers,
+
+       .reset_link     = aer_root_reset,
+};
+
+/**
+ * aer_irq - Root Port's ISR
+ * @irq: IRQ assigned to Root Port
+ * @context: pointer to Root Port data structure
+ * @r: pointer struct pt_regs
+ *
+ * Invoked when Root Port detects AER messages.
+ **/
+static irqreturn_t aer_irq(int irq, void *context, struct pt_regs * r)
+{
+       unsigned int status, id;
+       struct pcie_device *pdev = (struct pcie_device *)context;
+       struct aer_rpc *rpc = get_service_data(pdev);
+       int next_prod_idx;
+       unsigned long flags;
+       int pos;
+
+       pos = pci_find_aer_capability(pdev->port);
+       /*
+        * Must lock access to Root Error Status Reg, Root Error ID Reg,
+        * and Root error producer/consumer index
+        */
+       spin_lock_irqsave(&rpc->e_lock, flags);
+
+       /* Read error status */
+       pci_read_config_dword(pdev->port, pos + PCI_ERR_ROOT_STATUS, &status);
+       if (!(status & ROOT_ERR_STATUS_MASKS)) {
+               spin_unlock_irqrestore(&rpc->e_lock, flags);
+               return IRQ_NONE;
+       }
+
+       /* Read error source and clear error status */
+       pci_read_config_dword(pdev->port, pos + PCI_ERR_ROOT_COR_SRC, &id);
+       pci_write_config_dword(pdev->port, pos + PCI_ERR_ROOT_STATUS, status);
+
+       /* Store error source for later DPC handler */
+       next_prod_idx = rpc->prod_idx + 1;
+       if (next_prod_idx == AER_ERROR_SOURCES_MAX)
+               next_prod_idx = 0;
+       if (next_prod_idx == rpc->cons_idx) {
+               /*
+                * Error Storm Condition - possibly the same error occurred.
+                * Drop the error.
+                */
+               spin_unlock_irqrestore(&rpc->e_lock, flags);
+               return IRQ_HANDLED;
+       }
+       rpc->e_sources[rpc->prod_idx].status =  status;
+       rpc->e_sources[rpc->prod_idx].id = id;
+       rpc->prod_idx = next_prod_idx;
+       spin_unlock_irqrestore(&rpc->e_lock, flags);
+
+       /*  Invoke DPC handler */
+       schedule_work(&rpc->dpc_handler);
+
+       return IRQ_HANDLED;
+}
+
+/**
+ * aer_alloc_rpc - allocate Root Port data structure
+ * @dev: pointer to the pcie_dev data structure
+ *
+ * Invoked when Root Port's AER service is loaded.
+ **/
+static struct aer_rpc* aer_alloc_rpc(struct pcie_device *dev)
+{
+       struct aer_rpc *rpc;
+
+       if (!(rpc = (struct aer_rpc *)kmalloc(sizeof(struct aer_rpc),
+               GFP_KERNEL)))
+               return NULL;
+
+       memset(rpc, 0, sizeof(struct aer_rpc));
+       /*
+        * Initialize Root lock access, e_lock, to Root Error Status Reg,
+        * Root Error ID Reg, and Root error producer/consumer index.
+        */
+       rpc->e_lock = SPIN_LOCK_UNLOCKED;
+
+       rpc->rpd = dev;
+       INIT_WORK(&rpc->dpc_handler, aer_isr, (void *)dev);
+       rpc->prod_idx = rpc->cons_idx = 0;
+       mutex_init(&rpc->rpc_mutex);
+       init_waitqueue_head(&rpc->wait_release);
+
+       /* Use PCIE bus function to store rpc into PCIE device */
+       set_service_data(dev, rpc);
+
+       return rpc;
+}
+
+/**
+ * aer_remove - clean up resources
+ * @dev: pointer to the pcie_dev data structure
+ *
+ * Invoked when PCI Express bus unloads or AER probe fails.
+ **/
+static void aer_remove(struct pcie_device *dev)
+{
+       struct aer_rpc *rpc = get_service_data(dev);
+
+       if (rpc) {
+               /* If register interrupt service, it must be free. */
+               if (rpc->isr)
+                       free_irq(dev->irq, dev);
+
+               wait_event(rpc->wait_release, rpc->prod_idx == rpc->cons_idx);
+
+               aer_delete_rootport(rpc);
+               set_service_data(dev, NULL);
+       }
+}
+
+/**
+ * aer_probe - initialize resources
+ * @dev: pointer to the pcie_dev data structure
+ * @id: pointer to the service id data structure
+ *
+ * Invoked when PCI Express bus loads AER service driver.
+ **/
+static int __devinit aer_probe (struct pcie_device *dev,
+                               const struct pcie_port_service_id *id )
+{
+       int status;
+       struct aer_rpc *rpc;
+       struct device *device = &dev->device;
+
+       /* Init */
+       if ((status = aer_init(dev)))
+               return status;
+
+       /* Alloc rpc data structure */
+       if (!(rpc = aer_alloc_rpc(dev))) {
+               printk(KERN_DEBUG "%s: Alloc rpc fails on PCIE device[%s]\n",
+                       __FUNCTION__, device->bus_id);
+               aer_remove(dev);
+               return -ENOMEM;
+       }
+
+       /* Request IRQ ISR */
+       if ((status = request_irq(dev->irq, aer_irq, SA_SHIRQ, "aerdrv",
+                               dev))) {
+               printk(KERN_DEBUG "%s: Request ISR fails on PCIE device[%s]\n",
+                       __FUNCTION__, device->bus_id);
+               aer_remove(dev);
+               return status;
+       }
+
+       rpc->isr = 1;
+
+       aer_enable_rootport(rpc);
+
+       return status;
+}
+
+/**
+ * aer_root_reset - reset link on Root Port
+ * @dev: pointer to Root Port's pci_dev data structure
+ *
+ * Invoked by Port Bus driver when performing link reset at Root Port.
+ **/
+static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
+{
+       u16 p2p_ctrl;
+       u32 status;
+       int pos;
+
+       pos = pci_find_aer_capability(dev);
+
+       /* Disable Root's interrupt in response to error messages */
+       pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, 0);
+
+       /* Assert Secondary Bus Reset */
+       pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &p2p_ctrl);
+       p2p_ctrl |= PCI_CB_BRIDGE_CTL_CB_RESET;
+       pci_write_config_word(dev, PCI_BRIDGE_CONTROL, p2p_ctrl);
+
+       /* De-assert Secondary Bus Reset */
+       p2p_ctrl &= ~PCI_CB_BRIDGE_CTL_CB_RESET;
+       pci_write_config_word(dev, PCI_BRIDGE_CONTROL, p2p_ctrl);
+
+       /*
+        * System software must wait for at least 100ms from the end
+        * of a reset of one or more device before it is permitted
+        * to issue Configuration Requests to those devices.
+        */
+       msleep(200);
+       printk(KERN_DEBUG "Complete link reset at Root[%s]\n", dev->dev.bus_id);
+
+       /* Enable Root Port's interrupt in response to error messages */
+       pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &status);
+       pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, status);
+       pci_write_config_dword(dev,
+               pos + PCI_ERR_ROOT_COMMAND,
+               ROOT_PORT_INTR_ON_MESG_MASK);
+
+       return PCI_ERS_RESULT_RECOVERED;
+}
+
+/**
+ * aer_error_detected - update severity status
+ * @dev: pointer to Root Port's pci_dev data structure
+ * @error: error severity being notified by port bus
+ *
+ * Invoked by Port Bus driver during error recovery.
+ **/
+static pci_ers_result_t aer_error_detected(struct pci_dev *dev,
+                       enum pci_channel_state error)
+{
+       /* Root Port has no impact. Always recovers. */
+       return PCI_ERS_RESULT_CAN_RECOVER;
+}
+
+/**
+ * aer_error_resume - clean up corresponding error status bits
+ * @dev: pointer to Root Port's pci_dev data structure
+ *
+ * Invoked by Port Bus driver during nonfatal recovery.
+ **/
+static void aer_error_resume(struct pci_dev *dev)
+{
+       int pos;
+       u32 status, mask;
+       u16 reg16;
+
+       /* Clean up Root device status */
+       pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
+       pci_read_config_word(dev, pos + PCI_EXP_DEVSTA, &reg16);
+       pci_write_config_word(dev, pos + PCI_EXP_DEVSTA, reg16);
+
+       /* Clean AER Root Error Status */
+       pos = pci_find_aer_capability(dev);
+       pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
+       pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &mask);
+       if (dev->error_state == pci_channel_io_normal)
+               status &= ~mask; /* Clear corresponding nonfatal bits */
+       else
+               status &= mask; /* Clear corresponding fatal bits */
+       pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
+}
+
+/**
+ * aer_service_init - register AER root service driver
+ *
+ * Invoked when AER root service driver is loaded.
+ **/
+static int __init aer_service_init(void)
+{
+       return pcie_port_service_register(&aerdrv);
+}
+
+/**
+ * aer_service_exit - unregister AER root service driver
+ *
+ * Invoked when AER root service driver is unloaded.
+ **/
+static void __exit aer_service_exit(void)
+{
+       pcie_port_service_unregister(&aerdrv);
+}
+
+module_init(aer_service_init);
+module_exit(aer_service_exit);
diff --git a/drivers/pci/pcie/aer/aerdrv.h b/drivers/pci/pcie/aer/aerdrv.h
new file mode 100644 (file)
index 0000000..daf0cad
--- /dev/null
@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2006 Intel Corp.
+ *     Tom Long Nguyen (tom.l.nguyen@intel.com)
+ *     Zhang Yanmin (yanmin.zhang@intel.com)
+ *
+ */
+
+#ifndef _AERDRV_H_
+#define _AERDRV_H_
+
+#include <linux/pcieport_if.h>
+#include <linux/aer.h>
+
+#define AER_NONFATAL                   0
+#define AER_FATAL                      1
+#define AER_CORRECTABLE                        2
+#define AER_UNCORRECTABLE              4
+#define AER_ERROR_MASK                 0x001fffff
+#define AER_ERROR(d)                   (d & AER_ERROR_MASK)
+
+#define OSC_METHOD_RUN_SUCCESS         0
+#define OSC_METHOD_NOT_SUPPORTED       1
+#define OSC_METHOD_RUN_FAILURE         2
+
+/* Root Error Status Register Bits */
+#define ROOT_ERR_STATUS_MASKS                  0x0f
+
+#define SYSTEM_ERROR_INTR_ON_MESG_MASK (PCI_EXP_RTCTL_SECEE|   \
+                                       PCI_EXP_RTCTL_SENFEE|   \
+                                       PCI_EXP_RTCTL_SEFEE)
+#define ROOT_PORT_INTR_ON_MESG_MASK    (PCI_ERR_ROOT_CMD_COR_EN|       \
+                                       PCI_ERR_ROOT_CMD_NONFATAL_EN|   \
+                                       PCI_ERR_ROOT_CMD_FATAL_EN)
+#define ERR_COR_ID(d)                  (d & 0xffff)
+#define ERR_UNCOR_ID(d)                        (d >> 16)
+
+#define AER_SUCCESS                    0
+#define AER_UNSUCCESS                  1
+#define AER_ERROR_SOURCES_MAX          100
+
+#define AER_LOG_TLP_MASKS              (PCI_ERR_UNC_POISON_TLP|        \
+                                       PCI_ERR_UNC_ECRC|               \
+                                       PCI_ERR_UNC_UNSUP|              \
+                                       PCI_ERR_UNC_COMP_ABORT|         \
+                                       PCI_ERR_UNC_UNX_COMP|           \
+                                       PCI_ERR_UNC_MALF_TLP)
+
+/* AER Error Info Flags */
+#define AER_TLP_HEADER_VALID_FLAG      0x00000001
+#define AER_MULTI_ERROR_VALID_FLAG     0x00000002
+
+#define ERR_CORRECTABLE_ERROR_MASK     0x000031c1
+#define ERR_UNCORRECTABLE_ERROR_MASK   0x001ff010
+
+struct header_log_regs {
+       unsigned int dw0;
+       unsigned int dw1;
+       unsigned int dw2;
+       unsigned int dw3;
+};
+
+struct aer_err_info {
+       int severity;                   /* 0:NONFATAL | 1:FATAL | 2:COR */
+       int flags;
+       unsigned int status;            /* COR/UNCOR Error Status */
+       struct header_log_regs tlp;     /* TLP Header */
+};
+
+struct aer_err_source {
+       unsigned int status;
+       unsigned int id;
+};
+
+struct aer_rpc {
+       struct pcie_device *rpd;        /* Root Port device */
+       struct work_struct dpc_handler;
+       struct aer_err_source e_sources[AER_ERROR_SOURCES_MAX];
+       unsigned short prod_idx;        /* Error Producer Index */
+       unsigned short cons_idx;        /* Error Consumer Index */
+       int isr;
+       spinlock_t e_lock;              /*
+                                        * Lock access to Error Status/ID Regs
+                                        * and error producer/consumer index
+                                        */
+       struct mutex rpc_mutex;         /*
+                                        * only one thread could do
+                                        * recovery on the same
+                                        * root port hierachy
+                                        */
+       wait_queue_head_t wait_release;
+};
+
+struct aer_broadcast_data {
+       enum pci_channel_state state;
+       enum pci_ers_result result;
+};
+
+static inline pci_ers_result_t merge_result(enum pci_ers_result orig,
+               enum pci_ers_result new)
+{
+       switch (orig) {
+       case PCI_ERS_RESULT_CAN_RECOVER:
+       case PCI_ERS_RESULT_RECOVERED:
+               orig = new;
+               break;
+       case PCI_ERS_RESULT_DISCONNECT:
+               if (new == PCI_ERS_RESULT_NEED_RESET)
+                       orig = new;
+               break;
+       default:
+               break;
+       }
+
+       return orig;
+}
+
+extern struct bus_type pcie_port_bus_type;
+extern void aer_enable_rootport(struct aer_rpc *rpc);
+extern void aer_delete_rootport(struct aer_rpc *rpc);
+extern int aer_init(struct pcie_device *dev);
+extern void aer_isr(void *context);
+extern void aer_print_error(struct pci_dev *dev, struct aer_err_info *info);
+extern int aer_osc_setup(struct pci_dev *dev);
+
+#endif //_AERDRV_H_
diff --git a/drivers/pci/pcie/aer/aerdrv_acpi.c b/drivers/pci/pcie/aer/aerdrv_acpi.c
new file mode 100644 (file)
index 0000000..fa68e89
--- /dev/null
@@ -0,0 +1,68 @@
+/*
+ * Access ACPI _OSC method
+ *
+ * Copyright (C) 2006 Intel Corp.
+ *     Tom Long Nguyen (tom.l.nguyen@intel.com)
+ *     Zhang Yanmin (yanmin.zhang@intel.com)
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/pm.h>
+#include <linux/suspend.h>
+#include <linux/acpi.h>
+#include <linux/pci-acpi.h>
+#include <linux/delay.h>
+#include "aerdrv.h"
+
+/**
+ * aer_osc_setup - run ACPI _OSC method
+ *
+ * Return:
+ *     Zero if success. Nonzero for otherwise.
+ *
+ * Invoked when PCIE bus loads AER service driver. To avoid conflict with
+ * BIOS AER support requires BIOS to yield AER control to OS native driver.
+ **/
+int aer_osc_setup(struct pci_dev *dev)
+{
+       int retval = OSC_METHOD_RUN_SUCCESS;
+       acpi_status status;
+       acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
+       struct pci_dev *pdev = dev;
+       struct pci_bus *parent;
+
+       while (!handle) {
+               if (!pdev || !pdev->bus->parent)
+                       break;
+               parent = pdev->bus->parent;
+               if (!parent->self)
+                       /* Parent must be a host bridge */
+                       handle = acpi_get_pci_rootbridge_handle(
+                                       pci_domain_nr(parent),
+                                       parent->number);
+               else
+                       handle = DEVICE_ACPI_HANDLE(
+                                       &(parent->self->dev));
+               pdev = parent->self;
+       }
+
+       if (!handle)
+               return OSC_METHOD_NOT_SUPPORTED;
+
+       pci_osc_support_set(OSC_EXT_PCI_CONFIG_SUPPORT);
+       status = pci_osc_control_set(handle, OSC_PCI_EXPRESS_AER_CONTROL |
+               OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
+       if (ACPI_FAILURE(status)) {
+               if (status == AE_SUPPORT)
+                       retval = OSC_METHOD_NOT_SUPPORTED;
+               else
+                       retval = OSC_METHOD_RUN_FAILURE;
+       }
+
+       return retval;
+}
+
diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c
new file mode 100644 (file)
index 0000000..5591043
--- /dev/null
@@ -0,0 +1,757 @@
+/*
+ * drivers/pci/pcie/aer/aerdrv_core.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * This file implements the core part of PCI-Express AER. When an pci-express
+ * error is delivered, an error message will be collected and printed to
+ * console, then, an error recovery procedure will be executed by following
+ * the pci error recovery rules.
+ *
+ * Copyright (C) 2006 Intel Corp.
+ *     Tom Long Nguyen (tom.l.nguyen@intel.com)
+ *     Zhang Yanmin (yanmin.zhang@intel.com)
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/pm.h>
+#include <linux/suspend.h>
+#include <linux/acpi.h>
+#include <linux/pci-acpi.h>
+#include <linux/delay.h>
+#include "aerdrv.h"
+
+static int forceload;
+module_param(forceload, bool, 0);
+
+#define PCI_CFG_SPACE_SIZE     (0x100)
+int pci_find_aer_capability(struct pci_dev *dev)
+{
+       int pos;
+       u32 reg32 = 0;
+
+       /* Check if it's a pci-express device */
+       pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
+       if (!pos)
+               return 0;
+
+       /* Check if it supports pci-express AER */
+       pos = PCI_CFG_SPACE_SIZE;
+       while (pos) {
+               if (pci_read_config_dword(dev, pos, &reg32))
+                       return 0;
+
+               /* some broken boards return ~0 */
+               if (reg32 == 0xffffffff)
+                       return 0;
+
+               if (PCI_EXT_CAP_ID(reg32) == PCI_EXT_CAP_ID_ERR)
+                       break;
+
+               pos = reg32 >> 20;
+       }
+
+       return pos;
+}
+
+int pci_enable_pcie_error_reporting(struct pci_dev *dev)
+{
+       u16 reg16 = 0;
+       int pos;
+
+       pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
+       if (!pos)
+               return -EIO;
+
+       pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, &reg16);
+       reg16 = reg16 |
+               PCI_EXP_DEVCTL_CERE |
+               PCI_EXP_DEVCTL_NFERE |
+               PCI_EXP_DEVCTL_FERE |
+               PCI_EXP_DEVCTL_URRE;
+       pci_write_config_word(dev, pos+PCI_EXP_DEVCTL,
+                       reg16);
+       return 0;
+}
+
+int pci_disable_pcie_error_reporting(struct pci_dev *dev)
+{
+       u16 reg16 = 0;
+       int pos;
+
+       pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
+       if (!pos)
+               return -EIO;
+
+       pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, &reg16);
+       reg16 = reg16 & ~(PCI_EXP_DEVCTL_CERE |
+                       PCI_EXP_DEVCTL_NFERE |
+                       PCI_EXP_DEVCTL_FERE |
+                       PCI_EXP_DEVCTL_URRE);
+       pci_write_config_word(dev, pos+PCI_EXP_DEVCTL,
+                       reg16);
+       return 0;
+}
+
+int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
+{
+       int pos;
+       u32 status, mask;
+
+       pos = pci_find_aer_capability(dev);
+       if (!pos)
+               return -EIO;
+
+       pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
+       pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &mask);
+       if (dev->error_state == pci_channel_io_normal)
+               status &= ~mask; /* Clear corresponding nonfatal bits */
+       else
+               status &= mask; /* Clear corresponding fatal bits */
+       pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
+
+       return 0;
+}
+
+static int find_device_iter(struct device *device, void *data)
+{
+       struct pci_dev *dev;
+       u16 id = *(unsigned long *)data;
+       u8 secondary, subordinate, d_bus = id >> 8;
+
+       if (device->bus == &pci_bus_type) {
+               dev = to_pci_dev(device);
+               if (id == ((dev->bus->number << 8) | dev->devfn)) {
+                       /*
+                        * Device ID match
+                        */
+                       *(unsigned long*)data = (unsigned long)device;
+                       return 1;
+               }
+
+               /*
+                * If device is P2P, check if it is an upstream?
+                */
+               if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) {
+                       pci_read_config_byte(dev, PCI_SECONDARY_BUS,
+                               &secondary);
+                       pci_read_config_byte(dev, PCI_SUBORDINATE_BUS,
+                               &subordinate);
+                       if (d_bus >= secondary && d_bus <= subordinate) {
+                               *(unsigned long*)data = (unsigned long)device;
+                               return 1;
+                       }
+               }
+       }
+
+       return 0;
+}
+
+/**
+ * find_source_device - search through device hierarchy for source device
+ * @p_dev: pointer to Root Port pci_dev data structure
+ * @id: device ID of agent who sends an error message to this Root Port
+ *
+ * Invoked when error is detected at the Root Port.
+ **/
+static struct device* find_source_device(struct pci_dev *parent, u16 id)
+{
+       struct pci_dev *dev = parent;
+       struct device *device;
+       unsigned long device_addr;
+       int status;
+
+       /* Is Root Port an agent that sends error message? */
+       if (id == ((dev->bus->number << 8) | dev->devfn))
+               return &dev->dev;
+
+       do {
+               device_addr = id;
+               if ((status = device_for_each_child(&dev->dev,
+                       &device_addr, find_device_iter))) {
+                       device = (struct device*)device_addr;
+                       dev = to_pci_dev(device);
+                       if (id == ((dev->bus->number << 8) | dev->devfn))
+                               return device;
+               }
+       }while (status);
+
+       return NULL;
+}
+
+static void report_error_detected(struct pci_dev *dev, void *data)
+{
+       pci_ers_result_t vote;
+       struct pci_error_handlers *err_handler;
+       struct aer_broadcast_data *result_data;
+       result_data = (struct aer_broadcast_data *) data;
+
+       dev->error_state = result_data->state;
+
+       if (!dev->driver ||
+               !dev->driver->err_handler ||
+               !dev->driver->err_handler->error_detected) {
+               if (result_data->state == pci_channel_io_frozen &&
+                       !(dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)) {
+                       /*
+                        * In case of fatal recovery, if one of down-
+                        * stream device has no driver. We might be
+                        * unable to recover because a later insmod
+                        * of a driver for this device is unaware of
+                        * its hw state.
+                        */
+                       printk(KERN_DEBUG "Device ID[%s] has %s\n",
+                                       dev->dev.bus_id, (dev->driver) ?
+                                       "no AER-aware driver" : "no driver");
+               }
+               return;
+       }
+
+       err_handler = dev->driver->err_handler;
+       vote = err_handler->error_detected(dev, result_data->state);
+       result_data->result = merge_result(result_data->result, vote);
+       return;
+}
+
+static void report_mmio_enabled(struct pci_dev *dev, void *data)
+{
+       pci_ers_result_t vote;
+       struct pci_error_handlers *err_handler;
+       struct aer_broadcast_data *result_data;
+       result_data = (struct aer_broadcast_data *) data;
+
+       if (!dev->driver ||
+               !dev->driver->err_handler ||
+               !dev->driver->err_handler->mmio_enabled)
+               return;
+
+       err_handler = dev->driver->err_handler;
+       vote = err_handler->mmio_enabled(dev);
+       result_data->result = merge_result(result_data->result, vote);
+       return;
+}
+
+static void report_slot_reset(struct pci_dev *dev, void *data)
+{
+       pci_ers_result_t vote;
+       struct pci_error_handlers *err_handler;
+       struct aer_broadcast_data *result_data;
+       result_data = (struct aer_broadcast_data *) data;
+
+       if (!dev->driver ||
+               !dev->driver->err_handler ||
+               !dev->driver->err_handler->slot_reset)
+               return;
+
+       err_handler = dev->driver->err_handler;
+       vote = err_handler->slot_reset(dev);
+       result_data->result = merge_result(result_data->result, vote);
+       return;
+}
+
+static void report_resume(struct pci_dev *dev, void *data)
+{
+       struct pci_error_handlers *err_handler;
+
+       dev->error_state = pci_channel_io_normal;
+
+       if (!dev->driver ||
+               !dev->driver->err_handler ||
+               !dev->driver->err_handler->slot_reset)
+               return;
+
+       err_handler = dev->driver->err_handler;
+       err_handler->resume(dev);
+       return;
+}
+
+/**
+ * broadcast_error_message - handle message broadcast to downstream drivers
+ * @device: pointer to from where in a hierarchy message is broadcasted down
+ * @api: callback to be broadcasted
+ * @state: error state
+ *
+ * Invoked during error recovery process. Once being invoked, the content
+ * of error severity will be broadcasted to all downstream drivers in a
+ * hierarchy in question.
+ **/
+static pci_ers_result_t broadcast_error_message(struct pci_dev *dev,
+       enum pci_channel_state state,
+       char *error_mesg,
+       void (*cb)(struct pci_dev *, void *))
+{
+       struct aer_broadcast_data result_data;
+
+       printk(KERN_DEBUG "Broadcast %s message\n", error_mesg);
+       result_data.state = state;
+       if (cb == report_error_detected)
+               result_data.result = PCI_ERS_RESULT_CAN_RECOVER;
+       else
+               result_data.result = PCI_ERS_RESULT_RECOVERED;
+
+       if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) {
+               /*
+                * If the error is reported by a bridge, we think this error
+                * is related to the downstream link of the bridge, so we
+                * do error recovery on all subordinates of the bridge instead
+                * of the bridge and clear the error status of the bridge.
+                */
+               if (cb == report_error_detected)
+                       dev->error_state = state;
+               pci_walk_bus(dev->subordinate, cb, &result_data);
+               if (cb == report_resume) {
+                       pci_cleanup_aer_uncorrect_error_status(dev);
+                       dev->error_state = pci_channel_io_normal;
+               }
+       }
+       else {
+               /*
+                * If the error is reported by an end point, we think this
+                * error is related to the upstream link of the end point.
+                */
+               pci_walk_bus(dev->bus, cb, &result_data);
+       }
+
+       return result_data.result;
+}
+
+struct find_aer_service_data {
+       struct pcie_port_service_driver *aer_driver;
+       int is_downstream;
+};
+
+static int find_aer_service_iter(struct device *device, void *data)
+{
+       struct device_driver *driver;
+       struct pcie_port_service_driver *service_driver;
+       struct pcie_device *pcie_dev;
+       struct find_aer_service_data *result;
+
+       result = (struct find_aer_service_data *) data;
+
+       if (device->bus == &pcie_port_bus_type) {
+               pcie_dev = to_pcie_device(device);
+               if (pcie_dev->id.port_type == PCIE_SW_DOWNSTREAM_PORT)
+                       result->is_downstream = 1;
+
+               driver = device->driver;
+               if (driver) {
+                       service_driver = to_service_driver(driver);
+                       if (service_driver->id_table->service_type ==
+                                       PCIE_PORT_SERVICE_AER) {
+                               result->aer_driver = service_driver;
+                               return 1;
+                       }
+               }
+       }
+
+       return 0;
+}
+
+static void find_aer_service(struct pci_dev *dev,
+               struct find_aer_service_data *data)
+{
+       device_for_each_child(&dev->dev, data, find_aer_service_iter);
+}
+
+static pci_ers_result_t reset_link(struct pcie_device *aerdev,
+               struct pci_dev *dev)
+{
+       struct pci_dev *udev;
+       pci_ers_result_t status;
+       struct find_aer_service_data data;
+
+       if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)
+               udev = dev;
+       else
+               udev= dev->bus->self;
+
+       data.is_downstream = 0;
+       data.aer_driver = NULL;
+       find_aer_service(udev, &data);
+
+       /*
+        * Use the aer driver of the error agent firstly.
+        * If it hasn't the aer driver, use the root port's
+        */
+       if (!data.aer_driver || !data.aer_driver->reset_link) {
+               if (data.is_downstream &&
+                       aerdev->device.driver &&
+                       to_service_driver(aerdev->device.driver)->reset_link) {
+                       data.aer_driver =
+                               to_service_driver(aerdev->device.driver);
+               } else {
+                       printk(KERN_DEBUG "No link-reset support to Device ID"
+                               "[%s]\n",
+                               dev->dev.bus_id);
+                       return PCI_ERS_RESULT_DISCONNECT;
+               }
+       }
+
+       status = data.aer_driver->reset_link(udev);
+       if (status != PCI_ERS_RESULT_RECOVERED) {
+               printk(KERN_DEBUG "Link reset at upstream Device ID"
+                       "[%s] failed\n",
+                       udev->dev.bus_id);
+               return PCI_ERS_RESULT_DISCONNECT;
+       }
+
+       return status;
+}
+
+/**
+ * do_recovery - handle nonfatal/fatal error recovery process
+ * @aerdev: pointer to a pcie_device data structure of root port
+ * @dev: pointer to a pci_dev data structure of agent detecting an error
+ * @severity: error severity type
+ *
+ * Invoked when an error is nonfatal/fatal. Once being invoked, broadcast
+ * error detected message to all downstream drivers within a hierarchy in
+ * question and return the returned code.
+ **/
+static pci_ers_result_t do_recovery(struct pcie_device *aerdev,
+               struct pci_dev *dev,
+               int severity)
+{
+       pci_ers_result_t status, result = PCI_ERS_RESULT_RECOVERED;
+       enum pci_channel_state state;
+
+       if (severity == AER_FATAL)
+               state = pci_channel_io_frozen;
+       else
+               state = pci_channel_io_normal;
+
+       status = broadcast_error_message(dev,
+                       state,
+                       "error_detected",
+                       report_error_detected);
+
+       if (severity == AER_FATAL) {
+               result = reset_link(aerdev, dev);
+               if (result != PCI_ERS_RESULT_RECOVERED) {
+                       /* TODO: Should panic here? */
+                       return result;
+               }
+       }
+
+       if (status == PCI_ERS_RESULT_CAN_RECOVER)
+               status = broadcast_error_message(dev,
+                               state,
+                               "mmio_enabled",
+                               report_mmio_enabled);
+
+       if (status == PCI_ERS_RESULT_NEED_RESET) {
+               /*
+                * TODO: Should call platform-specific
+                * functions to reset slot before calling
+                * drivers' slot_reset callbacks?
+                */
+               status = broadcast_error_message(dev,
+                               state,
+                               "slot_reset",
+                               report_slot_reset);
+       }
+
+       if (status == PCI_ERS_RESULT_RECOVERED)
+               broadcast_error_message(dev,
+                               state,
+                               "resume",
+                               report_resume);
+
+       return status;
+}
+
+/**
+ * handle_error_source - handle logging error into an event log
+ * @aerdev: pointer to pcie_device data structure of the root port
+ * @dev: pointer to pci_dev data structure of error source device
+ * @info: comprehensive error information
+ *
+ * Invoked when an error being detected by Root Port.
+ **/
+static void handle_error_source(struct pcie_device * aerdev,
+       struct pci_dev *dev,
+       struct aer_err_info info)
+{
+       pci_ers_result_t status = 0;
+       int pos;
+
+       if (info.severity == AER_CORRECTABLE) {
+               /*
+                * Correctable error does not need software intevention.
+                * No need to go through error recovery process.
+                */
+               pos = pci_find_aer_capability(dev);
+               if (pos)
+                       pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS,
+                                       info.status);
+       } else {
+               status = do_recovery(aerdev, dev, info.severity);
+               if (status == PCI_ERS_RESULT_RECOVERED) {
+                       printk(KERN_DEBUG "AER driver successfully recovered\n");
+               } else {
+                       /* TODO: Should kernel panic here? */
+                       printk(KERN_DEBUG "AER driver didn't recover\n");
+               }
+       }
+}
+
+/**
+ * aer_enable_rootport - enable Root Port's interrupts when receiving messages
+ * @rpc: pointer to a Root Port data structure
+ *
+ * Invoked when PCIE bus loads AER service driver.
+ **/
+void aer_enable_rootport(struct aer_rpc *rpc)
+{
+       struct pci_dev *pdev = rpc->rpd->port;
+       int pos, aer_pos;
+       u16 reg16;
+       u32 reg32;
+
+       pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
+       /* Clear PCIE Capability's Device Status */
+       pci_read_config_word(pdev, pos+PCI_EXP_DEVSTA, &reg16);
+       pci_write_config_word(pdev, pos+PCI_EXP_DEVSTA, reg16);
+
+       /* Disable system error generation in response to error messages */
+       pci_read_config_word(pdev, pos + PCI_EXP_RTCTL, &reg16);
+       reg16 &= ~(SYSTEM_ERROR_INTR_ON_MESG_MASK);
+       pci_write_config_word(pdev, pos + PCI_EXP_RTCTL, reg16);
+
+       aer_pos = pci_find_aer_capability(pdev);
+       /* Clear error status */
+       pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, &reg32);
+       pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, reg32);
+       pci_read_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, &reg32);
+       pci_write_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, reg32);
+       pci_read_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, &reg32);
+       pci_write_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, reg32);
+
+       /* Enable Root Port device reporting error itself */
+       pci_read_config_word(pdev, pos+PCI_EXP_DEVCTL, &reg16);
+       reg16 = reg16 |
+               PCI_EXP_DEVCTL_CERE |
+               PCI_EXP_DEVCTL_NFERE |
+               PCI_EXP_DEVCTL_FERE |
+               PCI_EXP_DEVCTL_URRE;
+       pci_write_config_word(pdev, pos+PCI_EXP_DEVCTL,
+               reg16);
+
+       /* Enable Root Port's interrupt in response to error messages */
+       pci_write_config_dword(pdev,
+               aer_pos + PCI_ERR_ROOT_COMMAND,
+               ROOT_PORT_INTR_ON_MESG_MASK);
+}
+
+/**
+ * disable_root_aer - disable Root Port's interrupts when receiving messages
+ * @rpc: pointer to a Root Port data structure
+ *
+ * Invoked when PCIE bus unloads AER service driver.
+ **/
+static void disable_root_aer(struct aer_rpc *rpc)
+{
+       struct pci_dev *pdev = rpc->rpd->port;
+       u32 reg32;
+       int pos;
+
+       pos = pci_find_aer_capability(pdev);
+       /* Disable Root's interrupt in response to error messages */
+       pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, 0);
+
+       /* Clear Root's error status reg */
+       pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, &reg32);
+       pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, reg32);
+}
+
+/**
+ * get_e_source - retrieve an error source
+ * @rpc: pointer to the root port which holds an error
+ *
+ * Invoked by DPC handler to consume an error.
+ **/
+static struct aer_err_source* get_e_source(struct aer_rpc *rpc)
+{
+       struct aer_err_source *e_source;
+       unsigned long flags;
+
+       /* Lock access to Root error producer/consumer index */
+       spin_lock_irqsave(&rpc->e_lock, flags);
+       if (rpc->prod_idx == rpc->cons_idx) {
+               spin_unlock_irqrestore(&rpc->e_lock, flags);
+               return NULL;
+       }
+       e_source = &rpc->e_sources[rpc->cons_idx];
+       rpc->cons_idx++;
+       if (rpc->cons_idx == AER_ERROR_SOURCES_MAX)
+               rpc->cons_idx = 0;
+       spin_unlock_irqrestore(&rpc->e_lock, flags);
+
+       return e_source;
+}
+
+static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
+{
+       int pos;
+
+       pos = pci_find_aer_capability(dev);
+
+       /* The device might not support AER */
+       if (!pos)
+               return AER_SUCCESS;
+
+       if (info->severity == AER_CORRECTABLE) {
+               pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS,
+                       &info->status);
+               if (!(info->status & ERR_CORRECTABLE_ERROR_MASK))
+                       return AER_UNSUCCESS;
+       } else if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE ||
+               info->severity == AER_NONFATAL) {
+
+               /* Link is still healthy for IO reads */
+               pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
+                       &info->status);
+               if (!(info->status & ERR_UNCORRECTABLE_ERROR_MASK))
+                       return AER_UNSUCCESS;
+
+               if (info->status & AER_LOG_TLP_MASKS) {
+                       info->flags |= AER_TLP_HEADER_VALID_FLAG;
+                       pci_read_config_dword(dev,
+                               pos + PCI_ERR_HEADER_LOG, &info->tlp.dw0);
+                       pci_read_config_dword(dev,
+                               pos + PCI_ERR_HEADER_LOG + 4, &info->tlp.dw1);
+                       pci_read_config_dword(dev,
+                               pos + PCI_ERR_HEADER_LOG + 8, &info->tlp.dw2);
+                       pci_read_config_dword(dev,
+                               pos + PCI_ERR_HEADER_LOG + 12, &info->tlp.dw3);
+               }
+       }
+
+       return AER_SUCCESS;
+}
+
+/**
+ * aer_isr_one_error - consume an error detected by root port
+ * @p_device: pointer to error root port service device
+ * @e_src: pointer to an error source
+ **/
+static void aer_isr_one_error(struct pcie_device *p_device,
+               struct aer_err_source *e_src)
+{
+       struct device *s_device;
+       struct aer_err_info e_info = {0, 0, 0,};
+       int i;
+       u16 id;
+
+       /*
+        * There is a possibility that both correctable error and
+        * uncorrectable error being logged. Report correctable error first.
+        */
+       for (i = 1; i & ROOT_ERR_STATUS_MASKS ; i <<= 2) {
+               if (i > 4)
+                       break;
+               if (!(e_src->status & i))
+                       continue;
+
+               /* Init comprehensive error information */
+               if (i & PCI_ERR_ROOT_COR_RCV) {
+                       id = ERR_COR_ID(e_src->id);
+                       e_info.severity = AER_CORRECTABLE;
+               } else {
+                       id = ERR_UNCOR_ID(e_src->id);
+                       e_info.severity = ((e_src->status >> 6) & 1);
+               }
+               if (e_src->status &
+                       (PCI_ERR_ROOT_MULTI_COR_RCV |
+                        PCI_ERR_ROOT_MULTI_UNCOR_RCV))
+                       e_info.flags |= AER_MULTI_ERROR_VALID_FLAG;
+               if (!(s_device = find_source_device(p_device->port, id))) {
+                       printk(KERN_DEBUG "%s->can't find device of ID%04x\n",
+                               __FUNCTION__, id);
+                       continue;
+               }
+               if (get_device_error_info(to_pci_dev(s_device), &e_info) ==
+                               AER_SUCCESS) {
+                       aer_print_error(to_pci_dev(s_device), &e_info);
+                       handle_error_source(p_device,
+                               to_pci_dev(s_device),
+                               e_info);
+               }
+       }
+}
+
+/**
+ * aer_isr - consume errors detected by root port
+ * @context: pointer to a private data of pcie device
+ *
+ * Invoked, as DPC, when root port records new detected error
+ **/
+void aer_isr(void *context)
+{
+       struct pcie_device *p_device = (struct pcie_device *) context;
+       struct aer_rpc *rpc = get_service_data(p_device);
+       struct aer_err_source *e_src;
+
+       mutex_lock(&rpc->rpc_mutex);
+       e_src = get_e_source(rpc);
+       while (e_src) {
+               aer_isr_one_error(p_device, e_src);
+               e_src = get_e_source(rpc);
+       }
+       mutex_unlock(&rpc->rpc_mutex);
+
+       wake_up(&rpc->wait_release);
+}
+
+/**
+ * aer_delete_rootport - disable root port aer and delete service data
+ * @rpc: pointer to a root port device being deleted
+ *
+ * Invoked when AER service unloaded on a specific Root Port
+ **/
+void aer_delete_rootport(struct aer_rpc *rpc)
+{
+       /* Disable root port AER itself */
+       disable_root_aer(rpc);
+
+       kfree(rpc);
+}
+
+/**
+ * aer_init - provide AER initialization
+ * @dev: pointer to AER pcie device
+ *
+ * Invoked when AER service driver is loaded.
+ **/
+int aer_init(struct pcie_device *dev)
+{
+       int status;
+
+       /* Run _OSC Method */
+       status = aer_osc_setup(dev->port);
+
+       if(status != OSC_METHOD_RUN_SUCCESS) {
+               printk(KERN_DEBUG "%s: AER service init fails - %s\n",
+               __FUNCTION__,
+               (status == OSC_METHOD_NOT_SUPPORTED) ?
+                       "No ACPI _OSC support" : "Run ACPI _OSC fails");
+
+               if (!forceload)
+                       return status;
+       }
+
+       return AER_SUCCESS;
+}
+
+EXPORT_SYMBOL_GPL(pci_find_aer_capability);
+EXPORT_SYMBOL_GPL(pci_enable_pcie_error_reporting);
+EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting);
+EXPORT_SYMBOL_GPL(pci_cleanup_aer_uncorrect_error_status);
+
diff --git a/drivers/pci/pcie/aer/aerdrv_errprint.c b/drivers/pci/pcie/aer/aerdrv_errprint.c
new file mode 100644 (file)
index 0000000..3933d4f
--- /dev/null
@@ -0,0 +1,248 @@
+/*
+ * drivers/pci/pcie/aer/aerdrv_errprint.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Format error messages and print them to console.
+ *
+ * Copyright (C) 2006 Intel Corp.
+ *     Tom Long Nguyen (tom.l.nguyen@intel.com)
+ *     Zhang Yanmin (yanmin.zhang@intel.com)
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/pm.h>
+#include <linux/suspend.h>
+
+#include "aerdrv.h"
+
+#define AER_AGENT_RECEIVER             0
+#define AER_AGENT_REQUESTER            1
+#define AER_AGENT_COMPLETER            2
+#define AER_AGENT_TRANSMITTER          3
+
+#define AER_AGENT_REQUESTER_MASK       (PCI_ERR_UNC_COMP_TIME| \
+                                       PCI_ERR_UNC_UNSUP)
+
+#define AER_AGENT_COMPLETER_MASK       PCI_ERR_UNC_COMP_ABORT
+
+#define AER_AGENT_TRANSMITTER_MASK(t, e) (e & (PCI_ERR_COR_REP_ROLL| \
+       ((t == AER_CORRECTABLE) ? PCI_ERR_COR_REP_TIMER: 0)))
+
+#define AER_GET_AGENT(t, e)                                            \
+       ((e & AER_AGENT_COMPLETER_MASK) ? AER_AGENT_COMPLETER :         \
+       (e & AER_AGENT_REQUESTER_MASK) ? AER_AGENT_REQUESTER :          \
+       (AER_AGENT_TRANSMITTER_MASK(t, e)) ? AER_AGENT_TRANSMITTER :    \
+       AER_AGENT_RECEIVER)
+
+#define AER_PHYSICAL_LAYER_ERROR_MASK  PCI_ERR_COR_RCVR
+#define AER_DATA_LINK_LAYER_ERROR_MASK(t, e)   \
+               (PCI_ERR_UNC_DLP|               \
+               PCI_ERR_COR_BAD_TLP|            \
+               PCI_ERR_COR_BAD_DLLP|           \
+               PCI_ERR_COR_REP_ROLL|           \
+               ((t == AER_CORRECTABLE) ?       \
+               PCI_ERR_COR_REP_TIMER: 0))
+
+#define AER_PHYSICAL_LAYER_ERROR       0
+#define AER_DATA_LINK_LAYER_ERROR      1
+#define AER_TRANSACTION_LAYER_ERROR    2
+
+#define AER_GET_LAYER_ERROR(t, e)                              \
+       ((e & AER_PHYSICAL_LAYER_ERROR_MASK) ?                  \
+       AER_PHYSICAL_LAYER_ERROR :                              \
+       (e & AER_DATA_LINK_LAYER_ERROR_MASK(t, e)) ?            \
+               AER_DATA_LINK_LAYER_ERROR :                     \
+               AER_TRANSACTION_LAYER_ERROR)
+
+/*
+ * AER error strings
+ */
+static char* aer_error_severity_string[] = {
+       "Uncorrected (Non-Fatal)",
+       "Uncorrected (Fatal)",
+       "Corrected"
+};
+
+static char* aer_error_layer[] = {
+       "Physical Layer",
+       "Data Link Layer",
+       "Transaction Layer"
+};
+static char* aer_correctable_error_string[] = {
+       "Receiver Error        ",       /* Bit Position 0       */
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       "Bad TLP               ",       /* Bit Position 6       */
+       "Bad DLLP              ",       /* Bit Position 7       */
+       "RELAY_NUM Rollover    ",       /* Bit Position 8       */
+       NULL,
+       NULL,
+       NULL,
+       "Replay Timer Timeout  ",       /* Bit Position 12      */
+       "Advisory Non-Fatal    ",       /* Bit Position 13      */
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+};
+
+static char* aer_uncorrectable_error_string[] = {
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       "Data Link Protocol    ",       /* Bit Position 4       */
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       "Poisoned TLP          ",       /* Bit Position 12      */
+       "Flow Control Protocol ",       /* Bit Position 13      */
+       "Completion Timeout    ",       /* Bit Position 14      */
+       "Completer Abort       ",       /* Bit Position 15      */
+       "Unexpected Completion ",       /* Bit Position 16      */
+       "Receiver Overflow     ",       /* Bit Position 17      */
+       "Malformed TLP         ",       /* Bit Position 18      */
+       "ECRC                  ",       /* Bit Position 19      */
+       "Unsupported Request   ",       /* Bit Position 20      */
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+       NULL,
+};
+
+static char* aer_agent_string[] = {
+       "Receiver ID",
+       "Requester ID",
+       "Completer ID",
+       "Transmitter ID"
+};
+
+static char * aer_get_error_source_name(int severity,
+                       unsigned int status,
+                       char errmsg_buff[])
+{
+       int i;
+       char * errmsg = NULL;
+
+       for (i = 0; i < 32; i++) {
+               if (!(status & (1 << i)))
+                       continue;
+
+               if (severity == AER_CORRECTABLE)
+                       errmsg = aer_correctable_error_string[i];
+               else
+                       errmsg = aer_uncorrectable_error_string[i];
+
+               if (!errmsg) {
+                       sprintf(errmsg_buff, "Unknown Error Bit %2d  ", i);
+                       errmsg = errmsg_buff;
+               }
+
+               break;
+       }
+
+       return errmsg;
+}
+
+static DEFINE_SPINLOCK(logbuf_lock);
+static char errmsg_buff[100];
+void aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
+{
+       char * errmsg;
+       int err_layer, agent;
+       char * loglevel;
+
+       if (info->severity == AER_CORRECTABLE)
+               loglevel = KERN_WARNING;
+       else
+               loglevel = KERN_ERR;
+
+       printk("%s+------ PCI-Express Device Error ------+\n", loglevel);
+       printk("%sError Severity\t\t: %s\n", loglevel,
+               aer_error_severity_string[info->severity]);
+
+       if ( info->status == 0) {
+               printk("%sPCIE Bus Error type\t: (Unaccessible)\n", loglevel);
+               printk("%sUnaccessible Received\t: %s\n", loglevel,
+                       info->flags & AER_MULTI_ERROR_VALID_FLAG ?
+                               "Multiple" : "First");
+               printk("%sUnregistered Agent ID\t: %04x\n", loglevel,
+                       (dev->bus->number << 8) | dev->devfn);
+       } else {
+               err_layer = AER_GET_LAYER_ERROR(info->severity, info->status);
+               printk("%sPCIE Bus Error type\t: %s\n", loglevel,
+                       aer_error_layer[err_layer]);
+
+               spin_lock(&logbuf_lock);
+               errmsg = aer_get_error_source_name(info->severity,
+                               info->status,
+                               errmsg_buff);
+               printk("%s%s\t: %s\n", loglevel, errmsg,
+                       info->flags & AER_MULTI_ERROR_VALID_FLAG ?
+                               "Multiple" : "First");
+               spin_unlock(&logbuf_lock);
+
+               agent = AER_GET_AGENT(info->severity, info->status);
+               printk("%s%s\t\t: %04x\n", loglevel,
+                       aer_agent_string[agent],
+                       (dev->bus->number << 8) | dev->devfn);
+
+               printk("%sVendorID=%04xh, DeviceID=%04xh,"
+                       " Bus=%02xh, Device=%02xh, Function=%02xh\n",
+                       loglevel,
+                       dev->vendor,
+                       dev->device,
+                       dev->bus->number,
+                       PCI_SLOT(dev->devfn),
+                       PCI_FUNC(dev->devfn));
+
+               if (info->flags & AER_TLP_HEADER_VALID_FLAG) {
+                       unsigned char *tlp = (unsigned char *) &info->tlp;
+                       printk("%sTLB Header:\n", loglevel);
+                       printk("%s%02x%02x%02x%02x %02x%02x%02x%02x"
+                               " %02x%02x%02x%02x %02x%02x%02x%02x\n",
+                               loglevel,
+                               *(tlp + 3), *(tlp + 2), *(tlp + 1), *tlp,
+                               *(tlp + 7), *(tlp + 6), *(tlp + 5), *(tlp + 4),
+                               *(tlp + 11), *(tlp + 10), *(tlp + 9),
+                               *(tlp + 8), *(tlp + 15), *(tlp + 14),
+                               *(tlp + 13), *(tlp + 12));
+               }
+       }
+}
+
diff --git a/include/linux/aer.h b/include/linux/aer.h
new file mode 100644 (file)
index 0000000..402e178
--- /dev/null
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2006 Intel Corp.
+ *     Tom Long Nguyen (tom.l.nguyen@intel.com)
+ *     Zhang Yanmin (yanmin.zhang@intel.com)
+ */
+
+#ifndef _AER_H_
+#define _AER_H_
+
+#if defined(CONFIG_PCIEAER)
+/* pci-e port driver needs this function to enable aer */
+extern int pci_enable_pcie_error_reporting(struct pci_dev *dev);
+extern int pci_find_aer_capability(struct pci_dev *dev);
+extern int pci_disable_pcie_error_reporting(struct pci_dev *dev);
+extern int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev);
+#else
+#define pci_enable_pcie_error_reporting(dev)           do { } while (0)
+#define pci_find_aer_capability(dev)                   do { } while (0)
+#define pci_disable_pcie_error_reporting(dev)          do { } while (0)
+#define pci_cleanup_aer_uncorrect_error_status(dev)    do { } while (0)
+#endif
+
+#endif //_AER_H_
+
index b44e01a..6cd91e3 100644 (file)
@@ -62,6 +62,12 @@ struct pcie_port_service_driver {
        int (*suspend) (struct pcie_device *dev, pm_message_t state);
        int (*resume) (struct pcie_device *dev);
 
+       /* Service Error Recovery Handler */
+       struct pci_error_handlers *err_handler;
+
+       /* Link Reset Capability - AER service driver specific */
+       pci_ers_result_t (*reset_link) (struct pci_dev *dev);
+
        const struct pcie_port_service_id *id_table;
        struct device_driver driver;
 };