PCI-Express AER implemetation: pcie_portdrv error handler

Patch 4 implements error handlers for pcie_portdrv.

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

1 files changed, 175 insertions, 21 deletions

diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c
index 3284199ce39..e4a2429986f 100644
--- a/drivers/pci/pcie/portdrv_pci.c
+++ b/drivers/pci/pcie/portdrv_pci.c
@@ -14,8 +14,10 @@
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/pcieport_if.h>
+#include <linux/aer.h>
 
 #include "portdrv.h"
+#include "aer/aerdrv.h"
 
 /*
  * Version Information
@@ -30,6 +32,43 @@ MODULE_LICENSE("GPL");
 /* global data */
 static const char device_name[] = "pcieport-driver";
 
+static int pcie_portdrv_save_config(struct pci_dev *dev)
+{
+        return pci_save_state(dev);
+}
+
+#ifdef CONFIG_PM
+static int pcie_portdrv_restore_config(struct pci_dev *dev)
+{
+        int retval;
+
+        pci_restore_state(dev);
+        retval = pci_enable_device(dev);
+        if (retval)
+                return retval;
+        pci_set_master(dev);
+        return 0;
+}
+
+static int pcie_portdrv_suspend(struct pci_dev *dev, pm_message_t state)
+{
+        int ret = pcie_port_device_suspend(dev, state);
+
+        if (!ret)
+                ret = pcie_portdrv_save_config(dev);
+        return ret;
+}
+
+static int pcie_portdrv_resume(struct pci_dev *dev)
+{
+        pcie_portdrv_restore_config(dev);
+        return pcie_port_device_resume(dev);
+}
+#else
+#define pcie_portdrv_suspend NULL
+#define pcie_portdrv_resume NULL
+#endif
+
 /*
  * pcie_portdrv_probe - Probe PCI-Express port devices
  * @dev: PCI-Express port device being probed
@@ -61,6 +100,10 @@ static int __devinit pcie_portdrv_probe (struct pci_dev *dev,
                 return -ENOMEM;
         }
 
+        pcie_portdrv_save_config(dev);
+
+        pci_enable_pcie_error_reporting(dev);
+
         return 0;
 }
 
@@ -70,39 +113,143 @@ static void pcie_portdrv_remove (struct pci_dev *dev)
         kfree(pci_get_drvdata(dev));
 }
 
-#ifdef CONFIG_PM
-static int pcie_portdrv_save_config(struct pci_dev *dev)
+static int error_detected_iter(struct device *device, void *data)
 {
-        return pci_save_state(dev);
+        struct pcie_device *pcie_device;
+        struct pcie_port_service_driver *driver;
+        struct aer_broadcast_data *result_data;
+        pci_ers_result_t status;
+
+        result_data = (struct aer_broadcast_data *) data;
+
+        if (device->bus == &pcie_port_bus_type && device->driver) {
+                driver = to_service_driver(device->driver);
+                if (!driver ||
+                        !driver->err_handler ||
+                        !driver->err_handler->error_detected)
+                        return 0;
+
+                pcie_device = to_pcie_device(device);
+
+                /* Forward error detected message to service drivers */
+                status = driver->err_handler->error_detected(
+                        pcie_device->port,
+                        result_data->state);
+                result_data->result =
+                        merge_result(result_data->result, status);
+        }
+
+        return 0;
 }
 
-static int pcie_portdrv_restore_config(struct pci_dev *dev)
+static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
+                                        enum pci_channel_state error)
 {
-        int retval;
+        struct aer_broadcast_data result_data =
+                        {error, PCI_ERS_RESULT_CAN_RECOVER};
+
+        device_for_each_child(&dev->dev, &result_data, error_detected_iter);
+
+        return result_data.result;
+}
+
+static int mmio_enabled_iter(struct device *device, void *data)
+{
+        struct pcie_device *pcie_device;
+        struct pcie_port_service_driver *driver;
+        pci_ers_result_t status, *result;
+
+        result = (pci_ers_result_t *) data;
+
+        if (device->bus == &pcie_port_bus_type && device->driver) {
+                driver = to_service_driver(device->driver);
+                if (driver &&
+                        driver->err_handler &&
+                        driver->err_handler->mmio_enabled) {
+                        pcie_device = to_pcie_device(device);
+
+                        /* Forward error message to service drivers */
+                        status = driver->err_handler->mmio_enabled(
+                                        pcie_device->port);
+                        *result = merge_result(*result, status);
+                }
+        }
 
-        pci_restore_state(dev);
-        retval = pci_enable_device(dev);
-        if (retval)
-                return retval;
-        pci_set_master(dev);
         return 0;
 }
 
-static int pcie_portdrv_suspend (struct pci_dev *dev, pm_message_t state)
+static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
 {
-        int ret = pcie_port_device_suspend(dev, state);
+        pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
 
-        if (!ret)
-                ret = pcie_portdrv_save_config(dev);
-        return ret;
+        device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
+        return status;
 }
 
-static int pcie_portdrv_resume (struct pci_dev *dev)
+static int slot_reset_iter(struct device *device, void *data)
 {
-        pcie_portdrv_restore_config(dev);
-        return pcie_port_device_resume(dev);
+        struct pcie_device *pcie_device;
+        struct pcie_port_service_driver *driver;
+        pci_ers_result_t status, *result;
+
+        result = (pci_ers_result_t *) data;
+
+        if (device->bus == &pcie_port_bus_type && device->driver) {
+                driver = to_service_driver(device->driver);
+                if (driver &&
+                        driver->err_handler &&
+                        driver->err_handler->slot_reset) {
+                        pcie_device = to_pcie_device(device);
+
+                        /* Forward error message to service drivers */
+                        status = driver->err_handler->slot_reset(
+                                        pcie_device->port);
+                        *result = merge_result(*result, status);
+                }
+        }
+
+        return 0;
+}
+
+static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
+{
+        pci_ers_result_t status;
+
+        /* If fatal, restore cfg space for possible link reset at upstream */
+        if (dev->error_state == pci_channel_io_frozen) {
+                pcie_portdrv_restore_config(dev);
+                pci_enable_pcie_error_reporting(dev);
+        }
+
+        device_for_each_child(&dev->dev, &status, slot_reset_iter);
+
+        return status;
+}
+
+static int resume_iter(struct device *device, void *data)
+{
+        struct pcie_device *pcie_device;
+        struct pcie_port_service_driver *driver;
+
+        if (device->bus == &pcie_port_bus_type && device->driver) {
+                driver = to_service_driver(device->driver);
+                if (driver &&
+                        driver->err_handler &&
+                        driver->err_handler->resume) {
+                        pcie_device = to_pcie_device(device);
+
+                        /* Forward error message to service drivers */
+                        driver->err_handler->resume(pcie_device->port);
+                }
+        }
+
+        return 0;
+}
+
+static void pcie_portdrv_err_resume(struct pci_dev *dev)
+{
+        device_for_each_child(&dev->dev, NULL, resume_iter);
 }
-#endif
 
 /*
  * LINUX Device Driver Model
@@ -114,6 +261,13 @@ static const struct pci_device_id port_pci_ids[] = { {
 };
 MODULE_DEVICE_TABLE(pci, port_pci_ids);
 
+static struct pci_error_handlers pcie_portdrv_err_handler = {
+                .error_detected = pcie_portdrv_error_detected,
+                .mmio_enabled = pcie_portdrv_mmio_enabled,
+                .slot_reset = pcie_portdrv_slot_reset,
+                .resume = pcie_portdrv_err_resume,
+};
+
 static struct pci_driver pcie_portdrv = {
         .name           = (char *)device_name,
         .id_table       = &port_pci_ids[0],
@@ -121,10 +275,10 @@ static struct pci_driver pcie_portdrv = {
         .probe          = pcie_portdrv_probe,
         .remove         = pcie_portdrv_remove,
 
-#ifdef  CONFIG_PM
         .suspend        = pcie_portdrv_suspend,
         .resume         = pcie_portdrv_resume,
-#endif  /* PM */
+
+        .err_handler    = &pcie_portdrv_err_handler,
 };
 
 static int __init pcie_portdrv_init(void)