Merge branch 'pci/portdrv'

// SPDX-License-Identifier: GPL-2.0

/*

 * PCIe Port Native Services Support, ACPI-Related Part

 *

 * Copyright (C) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.

 */

#include <linux/pci.h>

#include <linux/kernel.h>

#include <linux/errno.h>

#include <linux/acpi.h>

#include <linux/pci-acpi.h>

#include "aer/aerdrv.h"

#include "../pci.h"

#include "portdrv.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.

 */

void pcie_port_acpi_setup(struct pci_dev *port, int *srv_mask)

{

	struct acpi_pci_root *root;

	acpi_handle handle;

	u32 flags;

	if (acpi_pci_disabled)

		return;

	handle = acpi_find_root_bridge_handle(port);

	if (!handle)

		return;

	root = acpi_pci_find_root(handle);

	if (!root)

		return;

	flags = root->osc_control_set;

	*srv_mask = 0;

	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 | PCIE_PORT_SERVICE_DPC;

}