c39fae1416
Apparently, some machines may have problems with PCI run-time power management if MSIs are used for the native PCIe PME signaling. In particular, on the MSI Wind U-100 PCIe PME interrupts are not generated by a PCIe root port after a resume from suspend to RAM, if the system wake-up was triggered by a PME from the device attached to this port. [It doesn't help to free the interrupt on suspend and request it back on resume, even if that is done along with disabling the MSI and re-enabling it, respectively.] However, if INTx interrupts are used for this purpose on the same machine, everything works just fine. For this reason, add a kernel command line switch allowing one to request that MSIs be not used for the native PCIe PME signaling, introduce a DMI table allowing us to blacklist machines that need this switch to be set by default and put the MSI Wind U-100 into this table. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
327 lines
7.7 KiB
C
327 lines
7.7 KiB
C
/*
|
|
* File: portdrv_pci.c
|
|
* Purpose: PCI Express Port Bus Driver
|
|
*
|
|
* Copyright (C) 2004 Intel
|
|
* Copyright (C) Tom Long Nguyen (tom.l.nguyen@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/slab.h>
|
|
#include <linux/pcieport_if.h>
|
|
#include <linux/aer.h>
|
|
#include <linux/dmi.h>
|
|
|
|
#include "portdrv.h"
|
|
#include "aer/aerdrv.h"
|
|
|
|
/*
|
|
* Version Information
|
|
*/
|
|
#define DRIVER_VERSION "v1.0"
|
|
#define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
|
|
#define DRIVER_DESC "PCIe Port Bus Driver"
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
/* global data */
|
|
|
|
static int pcie_portdrv_restore_config(struct pci_dev *dev)
|
|
{
|
|
int retval;
|
|
|
|
retval = pci_enable_device(dev);
|
|
if (retval)
|
|
return retval;
|
|
pci_set_master(dev);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static const struct dev_pm_ops pcie_portdrv_pm_ops = {
|
|
.suspend = pcie_port_device_suspend,
|
|
.resume = pcie_port_device_resume,
|
|
.freeze = pcie_port_device_suspend,
|
|
.thaw = pcie_port_device_resume,
|
|
.poweroff = pcie_port_device_suspend,
|
|
.restore = pcie_port_device_resume,
|
|
};
|
|
|
|
#define PCIE_PORTDRV_PM_OPS (&pcie_portdrv_pm_ops)
|
|
|
|
#else /* !PM */
|
|
|
|
#define PCIE_PORTDRV_PM_OPS NULL
|
|
#endif /* !PM */
|
|
|
|
/*
|
|
* pcie_portdrv_probe - Probe PCI-Express port devices
|
|
* @dev: PCI-Express port device being probed
|
|
*
|
|
* If detected invokes the pcie_port_device_register() method for
|
|
* this port device.
|
|
*
|
|
*/
|
|
static int __devinit pcie_portdrv_probe(struct pci_dev *dev,
|
|
const struct pci_device_id *id)
|
|
{
|
|
int status;
|
|
|
|
if (!pci_is_pcie(dev) ||
|
|
((dev->pcie_type != PCI_EXP_TYPE_ROOT_PORT) &&
|
|
(dev->pcie_type != PCI_EXP_TYPE_UPSTREAM) &&
|
|
(dev->pcie_type != PCI_EXP_TYPE_DOWNSTREAM)))
|
|
return -ENODEV;
|
|
|
|
if (!dev->irq && dev->pin) {
|
|
dev_warn(&dev->dev, "device [%04x:%04x] has invalid IRQ; "
|
|
"check vendor BIOS\n", dev->vendor, dev->device);
|
|
}
|
|
status = pcie_port_device_register(dev);
|
|
if (status)
|
|
return status;
|
|
|
|
pci_save_state(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pcie_portdrv_remove(struct pci_dev *dev)
|
|
{
|
|
pcie_port_device_remove(dev);
|
|
pci_disable_device(dev);
|
|
}
|
|
|
|
static int error_detected_iter(struct device *device, void *data)
|
|
{
|
|
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 pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
|
|
enum pci_channel_state error)
|
|
{
|
|
struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER};
|
|
int ret;
|
|
|
|
/* can not fail */
|
|
ret = device_for_each_child(&dev->dev, &data, error_detected_iter);
|
|
|
|
return 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);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
|
|
{
|
|
pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
|
|
int retval;
|
|
|
|
/* get true return value from &status */
|
|
retval = device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
|
|
return status;
|
|
}
|
|
|
|
static int slot_reset_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->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 = PCI_ERS_RESULT_RECOVERED;
|
|
int retval;
|
|
|
|
/* If fatal, restore cfg space for possible link reset at upstream */
|
|
if (dev->error_state == pci_channel_io_frozen) {
|
|
dev->state_saved = true;
|
|
pci_restore_state(dev);
|
|
pcie_portdrv_restore_config(dev);
|
|
pci_enable_pcie_error_reporting(dev);
|
|
}
|
|
|
|
/* get true return value from &status */
|
|
retval = 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)
|
|
{
|
|
int retval;
|
|
/* nothing to do with error value, if it ever happens */
|
|
retval = device_for_each_child(&dev->dev, NULL, resume_iter);
|
|
}
|
|
|
|
/*
|
|
* LINUX Device Driver Model
|
|
*/
|
|
static const struct pci_device_id port_pci_ids[] = { {
|
|
/* handle any PCI-Express port */
|
|
PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
|
|
}, { /* end: all zeroes */ }
|
|
};
|
|
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_portdriver = {
|
|
.name = "pcieport",
|
|
.id_table = &port_pci_ids[0],
|
|
|
|
.probe = pcie_portdrv_probe,
|
|
.remove = pcie_portdrv_remove,
|
|
|
|
.err_handler = &pcie_portdrv_err_handler,
|
|
|
|
.driver.pm = PCIE_PORTDRV_PM_OPS,
|
|
};
|
|
|
|
static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d)
|
|
{
|
|
pr_notice("%s detected: will not use MSI for PCIe PME signaling\n",
|
|
d->ident);
|
|
pcie_pme_disable_msi();
|
|
return 0;
|
|
}
|
|
|
|
static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = {
|
|
/*
|
|
* Boxes that should not use MSI for PCIe PME signaling.
|
|
*/
|
|
{
|
|
.callback = dmi_pcie_pme_disable_msi,
|
|
.ident = "MSI Wind U-100",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR,
|
|
"MICRO-STAR INTERNATIONAL CO., LTD"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "U-100"),
|
|
},
|
|
},
|
|
{}
|
|
};
|
|
|
|
static int __init pcie_portdrv_init(void)
|
|
{
|
|
int retval;
|
|
|
|
dmi_check_system(pcie_portdrv_dmi_table);
|
|
|
|
retval = pcie_port_bus_register();
|
|
if (retval) {
|
|
printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
|
|
goto out;
|
|
}
|
|
retval = pci_register_driver(&pcie_portdriver);
|
|
if (retval)
|
|
pcie_port_bus_unregister();
|
|
out:
|
|
return retval;
|
|
}
|
|
|
|
static void __exit pcie_portdrv_exit(void)
|
|
{
|
|
pci_unregister_driver(&pcie_portdriver);
|
|
pcie_port_bus_unregister();
|
|
}
|
|
|
|
module_init(pcie_portdrv_init);
|
|
module_exit(pcie_portdrv_exit);
|