AcoSail/kernel_optimize_test
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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6

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* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6:
  PCI/PM: Do not use native PCIe PME by default
This commit is contained in:
Linus Torvalds 2010-06-27 07:41:04 -07:00
commit dee70a32fa
2 changed files with 16 additions and 7 deletions
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4
Documentation/kernel-parameters.txt
View File

@ -2048,7 +2048,9 @@ and is between 256 and 4096 characters. It is defined in the file
WARNING: Forcing ASPM on may cause system lockups.
pcie_pme= [PCIE,PM] Native PCIe PME signaling options:
off Do not use native PCIe PME signaling.
Format: {auto|force}[,nomsi]
auto Use native PCIe PME signaling if the BIOS allows the
kernel to control PCIe config registers of root ports.
force Use native PCIe PME signaling even if the BIOS refuses
to allow the kernel to control the relevant PCIe config
registers.

19
drivers/pci/pcie/pme/pcie_pme.c
View File

@ -34,7 +34,7 @@
* being registered. Consequently, the interrupt-based PCIe PME signaling will
* not be used by any PCIe root ports in that case.
*/
static bool pcie_pme_disabled;
static bool pcie_pme_disabled = true;
/*
* The PCI Express Base Specification 2.0, Section 6.1.8, states the following:
@ -64,12 +64,19 @@ bool pcie_pme_msi_disabled;
static int __init pcie_pme_setup(char *str)
{
if (!strcmp(str, "off"))
pcie_pme_disabled = true;
else if (!strcmp(str, "force"))
if (!strncmp(str, "auto", 4))
pcie_pme_disabled = false;
else if (!strncmp(str, "force", 5))
pcie_pme_force_enable = true;
else if (!strcmp(str, "nomsi"))
pcie_pme_msi_disabled = true;
str = strchr(str, ',');
if (str) {
str++;
str += strspn(str, " \t");
if (*str && !strcmp(str, "nomsi"))
pcie_pme_msi_disabled = true;
}
return 1;
}
__setup("pcie_pme=", pcie_pme_setup);