PCI-Express AER implemetation: AER core and aerdriver

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>

1 files changed, 68 insertions, 0 deletions

diff --git a/drivers/pci/pcie/aer/aerdrv_acpi.c b/drivers/pci/pcie/aer/aerdrv_acpi.c
new file mode 100644
index 000000000000..fa68e89ebec9
--- /dev/null
+++ b/drivers/pci/pcie/aer/aerdrv_acpi.c
@@ -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;
+}
+