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: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 873b680..b9008fc 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2042,6 +2042,10 @@
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
diff --git a/drivers/pci/pcie/portdrv.h b/drivers/pci/pcie/portdrv.h
index 813a5c3..966f6e9 100644
--- a/drivers/pci/pcie/portdrv.h
+++ b/drivers/pci/pcie/portdrv.h
@@ -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
diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index e73effb..2bf2fe5 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -494,6 +494,9 @@
*/
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;
diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c
index 3debed2..a04392d 100644
--- a/drivers/pci/pcie/portdrv_pci.c
+++ b/drivers/pci/pcie/portdrv_pci.c
@@ -29,6 +29,18 @@
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 @@
{
int retval;
+ if (pcie_ports_disabled)
+ return -EACCES;
+
dmi_check_system(pcie_portdrv_dmi_table);
retval = pcie_port_bus_register();