1/*
 2 * PCIe Port Native Services Support, ACPI-Related Part
 3 *
 4 * Copyright (C) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
 5 *
 6 * This file is subject to the terms and conditions of the GNU General Public
 7 * License V2.  See the file "COPYING" in the main directory of this archive
 8 * for more details.
 9 */
10
11#include <linux/pci.h>
12#include <linux/kernel.h>
13#include <linux/errno.h>
14#include <linux/acpi.h>
15#include <linux/pci-acpi.h>
16#include <linux/pcieport_if.h>
17
18#include "aer/aerdrv.h"
19#include "../pci.h"
20
21/**
22 * pcie_port_acpi_setup - Request the BIOS to release control of PCIe services.
23 * @port: PCIe Port service for a root port or event collector.
24 * @srv_mask: Bit mask of services that can be enabled for @port.
25 *
26 * Invoked when @port is identified as a PCIe port device.  To avoid conflicts
27 * with the BIOS PCIe port native services support requires the BIOS to yield
28 * control of these services to the kernel.  The mask of services that the BIOS
29 * allows to be enabled for @port is written to @srv_mask.
30 *
31 * NOTE: It turns out that we cannot do that for individual port services
32 * separately, because that would make some systems work incorrectly.
33 */
34int pcie_port_acpi_setup(struct pci_dev *port, int *srv_mask)
35{
36	struct acpi_pci_root *root;
37	acpi_handle handle;
38	u32 flags;
39
40	if (acpi_pci_disabled)
41		return 0;
42
43	handle = acpi_find_root_bridge_handle(port);
44	if (!handle)
45		return -EINVAL;
46
47	root = acpi_pci_find_root(handle);
48	if (!root)
49		return -ENODEV;
50
51	flags = root->osc_control_set;
52
53	*srv_mask = PCIE_PORT_SERVICE_VC;
54	if (flags & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)
55		*srv_mask |= PCIE_PORT_SERVICE_HP;
56	if (flags & OSC_PCI_EXPRESS_PME_CONTROL)
57		*srv_mask |= PCIE_PORT_SERVICE_PME;
58	if (flags & OSC_PCI_EXPRESS_AER_CONTROL)
59		*srv_mask |= PCIE_PORT_SERVICE_AER;
60
61	return 0;
62}