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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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7
include/linux/pci-acpi.h
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@@ -107,9 +107,10 @@ static inline void acpiphp_check_host_bridge(struct acpi_device *adev) { }
#endif
extern const guid_t pci_acpi_dsm_guid;
#define DEVICE_LABEL_DSM 0x07
#define RESET_DELAY_DSM 0x08
#define FUNCTION_DELAY_DSM 0x09
#define IGNORE_PCI_BOOT_CONFIG_DSM 0x05
#define DEVICE_LABEL_DSM 0x07
#define RESET_DELAY_DSM 0x08
#define FUNCTION_DELAY_DSM 0x09
#else /* CONFIG_ACPI */
static inline void acpi_pci_add_bus(struct pci_bus *bus) { }