path: root/drivers/pci/pci-acpi.c

// SPDX-License-Identifier: GPL-2.0
/*
 * PCI support in ACPI
 *
 * Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com>
 * Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com>
 * Copyright (C) 2004 Intel Corp.
 */

#include <linux/delay.h>
#include <linux/init.h>
#include <linux/irqdomain.h>
#include <linux/pci.h>
#include <linux/msi.h>
#include <linux/pci_hotplug.h>
#include <linux/module.h>
#include <linux/pci-aspm.h>
#include <linux/pci-acpi.h>
#include <linux/pm_runtime.h>
#include <linux/pm_qos.h>
#include "pci.h"

/*
 * The GUID is defined in the PCI Firmware Specification available here:
 * https://www.pcisig.com/members/downloads/pcifw_r3_1_13Dec10.pdf
 */
const guid_t pci_acpi_dsm_guid =
	GUID_INIT(0xe5c937d0, 0x3553, 0x4d7a,
		  0x91, 0x17, 0xea, 0x4d, 0x19, 0xc3, 0x43, 0x4d);

#if defined(CONFIG_PCI_QUIRKS) && defined(CONFIG_ARM64)
static int acpi_get_rc_addr(struct acpi_device *adev, struct resource *res)
{
	struct device *dev = &adev->dev;
	struct resource_entry *entry;
	struct list_head list;
	unsigned long flags;
	int ret;

	INIT_LIST_HEAD(&list);
	flags = IORESOURCE_MEM;
	ret = acpi_dev_get_resources(adev, &list,
				     acpi_dev_filter_resource_type_cb,
				     (void *) flags);
	if (ret < 0) {
		dev_err(dev, "failed to parse _CRS method, error code %d\n",
			ret);
		return ret;
	}

	if (ret == 0) {
		dev_err(dev, "no IO and memory resources present in _CRS\n");
		return -EINVAL;
	}

	entry = list_first_entry(&list, struct resource_entry, node);
	*res = *entry->res;
	acpi_dev_free_resource_list(&list);
	return 0;
}

static acpi_status acpi_match_rc(acpi_handle handle, u32 lvl, void *context,
				 void **retval)
{
	u16 *segment = context;
	unsigned long long uid;
	acpi_status status;

	status = acpi_evaluate_integer(handle, "_UID", NULL, &uid);
	if (ACPI_FAILURE(status) || uid != *segment)
		return AE_CTRL_DEPTH;

	*(acpi_handle *)retval = handle;
	return AE_CTRL_TERMINATE;
}

int acpi_get_rc_resources(struct device *dev, const char *hid, u16 segment,
			  struct resource *res)
{
	struct acpi_device *adev;
	acpi_status status;
	acpi_handle handle;
	int ret;

	status = acpi_get_devices(hid, acpi_match_rc, &segment, &handle);
	if (ACPI_FAILURE(status)) {
		dev_err(dev, "can't find _HID %s device to locate resources\n",
			hid);
		return -ENODEV;
	}

	ret = acpi_bus_get_device(handle, &adev);
	if (ret)
		return ret;

	ret = acpi_get_rc_addr(adev, res);
	if (ret) {
		dev_err(dev, "can't get resource from %s\n",
			dev_name(&adev->dev));
		return ret;
	}

	return 0;
}
#endif

phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
{
	acpi_status status = AE_NOT_EXIST;
	unsigned long long mcfg_addr;

	if (handle)
		status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
					       NULL, &mcfg_addr);
	if (ACPI_FAILURE(status))
		return 0;

	return (phys_addr_t)mcfg_addr;
}

static acpi_status decode_type0_hpx_record(union acpi_object *record,
					   struct hpp_type0 *hpx0)
{
	int i;
	union acpi_object *fields = record->package.elements;
	u32 revision = fields[1].integer.value;

	switch (revision) {
	case 1:
		if (record->package.count != 6)
			return AE_ERROR;
		for (i = 2; i < 6; i++)
			if (fields[i].type != ACPI_TYPE_INTEGER)
				return AE_ERROR;
		hpx0->revision        = revision;
		hpx0->cache_line_size = fields[2].integer.value;
		hpx0->latency_timer   = fields[3].integer.value;
		hpx0->enable_serr     = fields[4].integer.value;
		hpx0->enable_perr     = fields[5].integer.value;
		break;
	default:
		pr_warn("%s: Type 0 Revision %d record not supported\n",
		       __func__, revision);
		return AE_ERROR;
	}
	return AE_OK;
}

static acpi_status decode_type1_hpx_record(union acpi_object *record,
					   struct hpp_type1 *hpx1)
{
	int i;
	union acpi_object *fields = record->package.elements;
	u32 revision = fields[1].integer.value;

	switch (revision) {
	case 1:
		if (record->package.count != 5)
			return AE_ERROR;
		for (i = 2; i < 5; i++)
			if (fields[i].type != ACPI_TYPE_INTEGER)
				return AE_ERROR;
		hpx1->revision      = revision;
		hpx1->max_mem_read  = fields[2].integer.value;
		hpx1->avg_max_split = fields[3].integer.value;
		hpx1->tot_max_split = fields[4].integer.value;
		break;
	default:
		pr_warn("%s: Type 1 Revision %d record not supported\