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PCI/ACPI: Advertise _HPX Type 3 support via _OSC

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_OSC now has a way to inform firmware that OS has the capability to
interpret _HPX Type 3 setting records.  This was added by the following
PCI Firmware Specification ECN:

  ECN:  _HPX and PCIe Completion Timeout related _OSC Enhancements
  Date:	September 12, 2018
  Affected Document: PCI Firmware Specification, Rev. 3.2

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Alexandru Gagniuc 2019-03-15 14:29:40 -05:00 committed by Bjorn Helgaas
parent f873c51a15
commit ba11edc650
2 changed files with 4 additions and 1 deletions
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2
drivers/acpi/pci_root.c
View File

@ -145,6 +145,7 @@ static struct pci_osc_bit_struct pci_osc_support_bit[] = {
{ OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" },
{ OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" },
{ OSC_PCI_MSI_SUPPORT, "MSI" },
{ OSC_PCI_HPX_TYPE_3_SUPPORT, "HPX-Type3" },
};
static struct pci_osc_bit_struct pci_osc_control_bit[] = {
@ -446,6 +447,7 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm,
* PCI domains, so we indicate this in _OSC support capabilities.
*/
support = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
support |= OSC_PCI_HPX_TYPE_3_SUPPORT;
if (pci_ext_cfg_avail())
support |= OSC_PCI_EXT_CONFIG_SUPPORT;
if (pcie_aspm_support_enabled())

3
include/linux/acpi.h
View File

@ -513,7 +513,8 @@ extern bool osc_pc_lpi_support_confirmed;
#define OSC_PCI_CLOCK_PM_SUPPORT 0x00000004
#define OSC_PCI_SEGMENT_GROUPS_SUPPORT 0x00000008
#define OSC_PCI_MSI_SUPPORT 0x00000010
#define OSC_PCI_SUPPORT_MASKS 0x0000001f
#define OSC_PCI_HPX_TYPE_3_SUPPORT 0x00000100
#define OSC_PCI_SUPPORT_MASKS 0x0000011f
/* PCI Host Bridge _OSC: Capabilities DWORD 3: Control Field */
#define OSC_PCI_EXPRESS_NATIVE_HP_CONTROL 0x00000001