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/*
* PCIe Port Native Services Support, ACPI-Related Part
*
* Copyright (C) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
*
* This file is subject to the terms and conditions of the GNU General Public
* License V2. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/acpi.h>
#include <linux/pci-acpi.h>
#include <linux/pcieport_if.h>
#include "aer/aerdrv.h"
#include "../pci.h"
/**
* pcie_port_acpi_setup - Request the BIOS to release control of PCIe services.
* @port: PCIe Port service for a root port or event collector.
* @srv_mask: Bit mask of services that can be enabled for @port.
*
* Invoked when @port is identified as a PCIe port device. To avoid conflicts
* with the BIOS PCIe port native services support requires the BIOS to yield
* control of these services to the kernel. The mask of services that the BIOS
* allows to be enabled for @port is written to @srv_mask.
*
* NOTE: It turns out that we cannot do that for individual port services
* separately, because that would make some systems work incorrectly.
*/
int pcie_port_acpi_setup(struct pci_dev *port, int *srv_mask)
{
acpi_status status;
acpi_handle handle;
u32 flags;
if (acpi_pci_disabled)
return 0;
handle = acpi_find_root_bridge_handle(port);
if (!handle)
return -EINVAL;
flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL
| OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
| OSC_PCI_EXPRESS_PME_CONTROL;
if (pci_aer_available()) {
if (aer_acpi_firmware_first())
dev_dbg(&port->dev, "PCIe errors handled by BIOS.\n");
else
flags |= OSC_PCI_EXPRESS_AER_CONTROL;
}
status = acpi_pci_osc_control_set(handle, &flags,
OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
if (ACPI_FAILURE(status)) {
dev_dbg(&port->dev, "ACPI _OSC request failed (code %d)\n",
status);
return -ENODEV;
}
dev_info(&port->dev, "ACPI _OSC control granted for 0x%02x\n", flags);
*srv_mask = PCIE_PORT_SERVICE_VC;
if (flags & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)
*srv_mask |= PCIE_PORT_SERVICE_HP;
if (flags & OSC_PCI_EXPRESS_PME_CONTROL)
*srv_mask |= PCIE_PORT_SERVICE_PME;
if (flags & OSC_PCI_EXPRESS_AER_CONTROL)
*srv_mask |= PCIE_PORT_SERVICE_AER;
return 0;
}
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