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authorRafael J. Wysocki <rjw@sisk.pl>2010-08-21 01:51:44 +0200
committerJesse Barnes <jbarnes@virtuousgeek.org>2010-08-24 13:43:15 -0700
commit79dd9182db2072d63ccf160bb9a3463b1c952723 (patch)
tree89069b3803a4e07924c6fd4414bbd2a771a432e9 /drivers/pci
parentf1a7bfaf6bb9cb195577e674c0ab2fd0a55d9014 (diff)
downloadop-kernel-dev-79dd9182db2072d63ccf160bb9a3463b1c952723.zip
op-kernel-dev-79dd9182db2072d63ccf160bb9a3463b1c952723.tar.gz
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>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/pcie/portdrv.h2
-rw-r--r--drivers/pci/pcie/portdrv_core.c3
-rw-r--r--drivers/pci/pcie/portdrv_pci.c15
3 files changed, 20 insertions, 0 deletions
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 @@ 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;
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_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();
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