Commit ba11edc6 authored by Alexandru Gagniuc's avatar Alexandru Gagniuc Committed by Bjorn Helgaas
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PCI/ACPI: Advertise _HPX Type 3 support via _OSC 



_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: default avatarAlexandru Gagniuc <mr.nuke.me@gmail.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent f873c51a

drivers/acpi/pci_root.c

+2 −0
Original line number Diff line number Diff line
@@ -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())

include/linux/acpi.h

+2 −1
Original line number Diff line number Diff line
@@ -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