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>

1 files changed, 4 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 873b68090098..b9008fc3a53d 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -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