315 lines
7.2 KiB
C
315 lines
7.2 KiB
C
/*
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* File: portdrv_pci.c
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* Purpose: PCI Express Port Bus Driver
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*
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* Copyright (C) 2004 Intel
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* Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
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*/
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/pm.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/pcieport_if.h>
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#include <linux/aer.h>
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#include "portdrv.h"
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#include "aer/aerdrv.h"
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/*
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* Version Information
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*/
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#define DRIVER_VERSION "v1.0"
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#define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
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#define DRIVER_DESC "PCIE Port Bus Driver"
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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/* global data */
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static const char device_name[] = "pcieport-driver";
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static int pcie_portdrv_save_config(struct pci_dev *dev)
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{
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return pci_save_state(dev);
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}
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static int pcie_portdrv_restore_config(struct pci_dev *dev)
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{
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int retval;
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pci_restore_state(dev);
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retval = pci_enable_device(dev);
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if (retval)
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return retval;
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pci_set_master(dev);
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return 0;
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}
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#ifdef CONFIG_PM
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static int pcie_portdrv_suspend(struct pci_dev *dev, pm_message_t state)
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{
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int ret = pcie_port_device_suspend(dev, state);
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if (!ret)
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ret = pcie_portdrv_save_config(dev);
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return ret;
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}
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static int pcie_portdrv_resume(struct pci_dev *dev)
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{
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pcie_portdrv_restore_config(dev);
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return pcie_port_device_resume(dev);
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}
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#else
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#define pcie_portdrv_suspend NULL
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#define pcie_portdrv_resume NULL
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#endif
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/*
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* pcie_portdrv_probe - Probe PCI-Express port devices
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* @dev: PCI-Express port device being probed
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*
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* If detected invokes the pcie_port_device_register() method for
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* this port device.
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*
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*/
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static int __devinit pcie_portdrv_probe (struct pci_dev *dev,
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const struct pci_device_id *id )
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{
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int status;
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status = pcie_port_device_probe(dev);
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if (status)
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return status;
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if (pci_enable_device(dev) < 0)
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return -ENODEV;
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pci_set_master(dev);
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if (!dev->irq && dev->pin) {
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dev_warn(&dev->dev, "device [%04x/%04x] has invalid IRQ; "
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"check vendor BIOS\n", dev->vendor, dev->device);
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}
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if (pcie_port_device_register(dev)) {
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pci_disable_device(dev);
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return -ENOMEM;
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}
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pcie_portdrv_save_config(dev);
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pci_enable_pcie_error_reporting(dev);
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return 0;
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}
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static void pcie_portdrv_remove (struct pci_dev *dev)
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{
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pcie_port_device_remove(dev);
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kfree(pci_get_drvdata(dev));
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}
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static int error_detected_iter(struct device *device, void *data)
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{
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struct pcie_device *pcie_device;
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struct pcie_port_service_driver *driver;
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struct aer_broadcast_data *result_data;
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pci_ers_result_t status;
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result_data = (struct aer_broadcast_data *) data;
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if (device->bus == &pcie_port_bus_type && device->driver) {
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driver = to_service_driver(device->driver);
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if (!driver ||
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!driver->err_handler ||
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!driver->err_handler->error_detected)
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return 0;
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pcie_device = to_pcie_device(device);
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/* Forward error detected message to service drivers */
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status = driver->err_handler->error_detected(
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pcie_device->port,
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result_data->state);
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result_data->result =
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merge_result(result_data->result, status);
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}
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return 0;
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}
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static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
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enum pci_channel_state error)
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{
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struct aer_broadcast_data result_data =
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{error, PCI_ERS_RESULT_CAN_RECOVER};
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int retval;
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/* can not fail */
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retval = device_for_each_child(&dev->dev, &result_data, error_detected_iter);
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return result_data.result;
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}
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static int mmio_enabled_iter(struct device *device, void *data)
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{
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struct pcie_device *pcie_device;
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struct pcie_port_service_driver *driver;
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pci_ers_result_t status, *result;
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result = (pci_ers_result_t *) data;
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if (device->bus == &pcie_port_bus_type && device->driver) {
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driver = to_service_driver(device->driver);
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if (driver &&
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driver->err_handler &&
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driver->err_handler->mmio_enabled) {
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pcie_device = to_pcie_device(device);
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/* Forward error message to service drivers */
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status = driver->err_handler->mmio_enabled(
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pcie_device->port);
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*result = merge_result(*result, status);
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}
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}
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return 0;
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}
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static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
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{
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pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
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int retval;
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/* get true return value from &status */
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retval = device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
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return status;
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}
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static int slot_reset_iter(struct device *device, void *data)
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{
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struct pcie_device *pcie_device;
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struct pcie_port_service_driver *driver;
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pci_ers_result_t status, *result;
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result = (pci_ers_result_t *) data;
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if (device->bus == &pcie_port_bus_type && device->driver) {
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driver = to_service_driver(device->driver);
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if (driver &&
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driver->err_handler &&
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driver->err_handler->slot_reset) {
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pcie_device = to_pcie_device(device);
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/* Forward error message to service drivers */
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status = driver->err_handler->slot_reset(
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pcie_device->port);
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*result = merge_result(*result, status);
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}
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}
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return 0;
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}
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static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
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{
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pci_ers_result_t status = PCI_ERS_RESULT_NONE;
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int retval;
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/* If fatal, restore cfg space for possible link reset at upstream */
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if (dev->error_state == pci_channel_io_frozen) {
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pcie_portdrv_restore_config(dev);
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pci_enable_pcie_error_reporting(dev);
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}
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/* get true return value from &status */
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retval = device_for_each_child(&dev->dev, &status, slot_reset_iter);
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return status;
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}
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static int resume_iter(struct device *device, void *data)
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{
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struct pcie_device *pcie_device;
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struct pcie_port_service_driver *driver;
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if (device->bus == &pcie_port_bus_type && device->driver) {
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driver = to_service_driver(device->driver);
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if (driver &&
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driver->err_handler &&
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driver->err_handler->resume) {
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pcie_device = to_pcie_device(device);
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/* Forward error message to service drivers */
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driver->err_handler->resume(pcie_device->port);
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}
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}
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return 0;
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}
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static void pcie_portdrv_err_resume(struct pci_dev *dev)
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{
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int retval;
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/* nothing to do with error value, if it ever happens */
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retval = device_for_each_child(&dev->dev, NULL, resume_iter);
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}
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/*
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* LINUX Device Driver Model
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*/
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static const struct pci_device_id port_pci_ids[] = { {
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/* handle any PCI-Express port */
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PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
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}, { /* end: all zeroes */ }
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};
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MODULE_DEVICE_TABLE(pci, port_pci_ids);
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static struct pci_error_handlers pcie_portdrv_err_handler = {
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.error_detected = pcie_portdrv_error_detected,
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.mmio_enabled = pcie_portdrv_mmio_enabled,
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.slot_reset = pcie_portdrv_slot_reset,
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.resume = pcie_portdrv_err_resume,
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};
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static struct pci_driver pcie_portdriver = {
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.name = (char *)device_name,
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.id_table = &port_pci_ids[0],
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.probe = pcie_portdrv_probe,
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.remove = pcie_portdrv_remove,
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.suspend = pcie_portdrv_suspend,
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.resume = pcie_portdrv_resume,
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.err_handler = &pcie_portdrv_err_handler,
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};
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static int __init pcie_portdrv_init(void)
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{
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int retval;
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retval = pcie_port_bus_register();
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if (retval) {
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printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
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goto out;
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}
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retval = pci_register_driver(&pcie_portdriver);
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if (retval)
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pcie_port_bus_unregister();
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out:
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return retval;
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}
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static void __exit pcie_portdrv_exit(void)
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{
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pci_unregister_driver(&pcie_portdriver);
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pcie_port_bus_unregister();
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}
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module_init(pcie_portdrv_init);
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module_exit(pcie_portdrv_exit);
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