LXR linux/drivers/pci/pcie/portdrv

   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}
  63