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PCI/ACPI: Evaluate PCI Boot Configuration _DSM

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Evaluate _DSM Function #5, the "PCI Boot Configuration" function.  If the
result is 0, the OS should preserve any resource assignments made by the
firmware.

Link: https://lore.kernel.org/r/20190615002359.29577-2-benh@kernel.crashing.org
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[bhelgaas: commit log]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Benjamin Herrenschmidt
2019-06-15 10:23:57 +10:00
committed by Bjorn Helgaas
parent a188339ca5
commit a78cf9657b
3 changed files with 18 additions and 3 deletions
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2
include/linux/pci.h
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@@ -505,6 +505,8 @@ struct pci_host_bridge {
unsigned int native_shpc_hotplug:1; /* OS may use SHPC hotplug */
unsigned int native_pme:1; /* OS may use PCIe PME */
unsigned int native_ltr:1; /* OS may use PCIe LTR */
unsigned int preserve_config:1; /* Preserve FW resource setup */
/* Resource alignment requirements */
resource_size_t (*align_resource)(struct pci_dev *dev,
const struct resource *res,