1 // SPDX-License-Identifier: GPL-2.0
3 * PCIe Port Native Services Support, ACPI-Related Part
5 * Copyright (C) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
9 #include <linux/kernel.h>
10 #include <linux/errno.h>
11 #include <linux/acpi.h>
12 #include <linux/pci-acpi.h>
14 #include "aer/aerdrv.h"
19 * pcie_port_acpi_setup - Request the BIOS to release control of PCIe services.
20 * @port: PCIe Port service for a root port or event collector.
21 * @srv_mask: Bit mask of services that can be enabled for @port.
23 * Invoked when @port is identified as a PCIe port device. To avoid conflicts
24 * with the BIOS PCIe port native services support requires the BIOS to yield
25 * control of these services to the kernel. The mask of services that the BIOS
26 * allows to be enabled for @port is written to @srv_mask.
28 * NOTE: It turns out that we cannot do that for individual port services
29 * separately, because that would make some systems work incorrectly.
31 void pcie_port_acpi_setup(struct pci_dev *port, int *srv_mask)
33 struct acpi_pci_root *root;
37 if (acpi_pci_disabled)
40 handle = acpi_find_root_bridge_handle(port);
44 root = acpi_pci_find_root(handle);
48 flags = root->osc_control_set;
50 *srv_mask = PCIE_PORT_SERVICE_VC | PCIE_PORT_SERVICE_DPC;
51 if (flags & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)
52 *srv_mask |= PCIE_PORT_SERVICE_HP;
53 if (flags & OSC_PCI_EXPRESS_PME_CONTROL)
54 *srv_mask |= PCIE_PORT_SERVICE_PME;
55 if (flags & OSC_PCI_EXPRESS_AER_CONTROL)
56 *srv_mask |= PCIE_PORT_SERVICE_AER;