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Commit 79dd9182 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki Committed by Jesse Barnes
Browse files

PCI: PCIe: Introduce commad line switch for disabling port services 



Introduce kernel command line switch pcie_ports= allowing one to
disable all of the native PCIe port services, so that PCIe ports
are treated like PCI-to-PCI bridges.

Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent f1a7bfaf

Documentation/kernel-parameters.txt

+4 −0
Original line number Diff line number Diff line
@@ -2042,6 +2042,10 @@ and is between 256 and 4096 characters. It is defined in the file 
		force	Enable ASPM even on devices that claim not to support it.

			WARNING: Forcing ASPM on may cause system lockups.



	pcie_ports=	[PCIE] PCIe ports handling:

		compat	Treat PCIe ports as PCI-to-PCI bridges, disable the PCIe

			ports driver.



	pcie_pme=	[PCIE,PM] Native PCIe PME signaling options:

			Format: {auto|force}[,nomsi]

		auto	Use native PCIe PME signaling if the BIOS allows the

drivers/pci/pcie/portdrv.h

+2 −0
Original line number Diff line number Diff line
@@ -20,6 +20,8 @@ 


#define get_descriptor_id(type, service) (((type - 4) << 4) | service)



extern bool pcie_ports_disabled;



extern struct bus_type pcie_port_bus_type;

extern int pcie_port_device_register(struct pci_dev *dev);

#ifdef CONFIG_PM

drivers/pci/pcie/portdrv_core.c

+3 −0
Original line number Diff line number Diff line
@@ -494,6 +494,9 @@ static void pcie_port_shutdown_service(struct device *dev) {} 
 */

int pcie_port_service_register(struct pcie_port_service_driver *new)

{

	if (pcie_ports_disabled)

		return -ENODEV;



	new->driver.name = (char *)new->name;

	new->driver.bus = &pcie_port_bus_type;

	new->driver.probe = pcie_port_probe_service;

drivers/pci/pcie/portdrv_pci.c

+15 −0
Original line number Diff line number Diff line
@@ -29,6 +29,18 @@ MODULE_AUTHOR(DRIVER_AUTHOR); 
MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");



/* If this switch is set, PCIe port native services should not be enabled. */

bool pcie_ports_disabled;



static int __init pcie_port_setup(char *str)

{

	if (!strncmp(str, "compat", 6))

		pcie_ports_disabled = true;



	return 1;

}

__setup("pcie_ports=", pcie_port_setup);



/* global data */



static int pcie_portdrv_restore_config(struct pci_dev *dev)
@@ -301,6 +313,9 @@ static int __init pcie_portdrv_init(void) 
{

	int retval;



	if (pcie_ports_disabled)

		return -EACCES;



	dmi_check_system(pcie_portdrv_dmi_table);



	retval = pcie_port_bus_register();