// SPDX-License-Identifier: GPL-2.0-or-later
/*
* pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
*
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/pci.h>
#include <linux/pci-acpi.h>
#include <linux/pci-aspm.h>
#include <linux/dmar.h>
#include <linux/acpi.h>
#include <linux/slab.h>
#include <linux/dmi.h>
#include <linux/platform_data/x86/apple.h>
#include <acpi/apei.h> /* for acpi_hest_init() */
#include "internal.h"
#define _COMPONENT ACPI_PCI_COMPONENT
ACPI_MODULE_NAME("pci_root");
#define ACPI_PCI_ROOT_CLASS "pci_bridge"
#define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
static int acpi_pci_root_add(struct acpi_device *device,
const struct acpi_device_id *not_used);
static void acpi_pci_root_remove(struct acpi_device *device);
static int acpi_pci_root_scan_dependent(struct acpi_device *adev)
{
acpiphp_check_host_bridge(adev);
return 0;
}
#define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \
| OSC_PCI_ASPM_SUPPORT \
| OSC_PCI_CLOCK_PM_SUPPORT \
| OSC_PCI_MSI_SUPPORT)
static const struct acpi_device_id root_device_ids[] = {
{"PNP0A03", 0},
{"", 0},
};
static struct acpi_scan_handler pci_root_handler = {
.ids = root_device_ids,
.attach = acpi_pci_root_add,
.detach = acpi_pci_root_remove,
.hotplug = {
.enabled = true,
.scan_dependent = acpi_pci_root_scan_dependent,
},
};
static DEFINE_MUTEX(osc_lock);
/**
* acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
* @handle - the ACPI CA node in question.
*
* Note: we could make this API take a struct acpi_device * instead, but
* for now, it's more convenient to operate on an acpi_handle.
*/
int acpi_is_root_bridge(acpi_handle handle)
{
int ret;
struct acpi_device *device;
ret = acpi_bus_get_device(handle, &device);
if (ret)
return 0;
ret = acpi_match_device_ids(device, root_device_ids);
if (ret)
return 0;
else
return 1;
}
EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
static acpi_status
get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
{
struct resource *res = data;
struct acpi_resource_address64 address;
acpi_status status;
status = acpi_resource_to_address64(resource, &address);
if (ACPI_FAILURE(status))
return AE_OK;
if ((address.address.address_length > 0) &&
(address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
res->start = address.address.minimum;
res->end = address.address.minimum + address.address.address_length - 1;
}
return AE_OK;
}
static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
struct resource *res)
{
acpi_status status;
res->start = -1;
status =
acpi_walk_resources(handle, METHOD_NAME__CRS,
get_root_bridge_busnr_callback, res);
if (ACPI_FAILURE(status))
return status;
if (res->start == -1)
return AE_ERROR;
return AE_OK;
}
struct pci_osc_bit_struct {
u32 bit;
char *desc;
};
static struct pci_osc_bit_struct pci_osc_support_bit[] = {
{ OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" },
{ OSC_PCI_ASPM_SUPPORT, "ASPM" },
{ OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" },
{ OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" },
{ OSC_PCI_MSI_SUPPORT, "MSI" },
{ OSC_PCI_HPX_TYPE_3_SUPPORT, "HPX-Type3" },
};
static struct pci_osc_bit_struct pci_osc_control_bit[] = {
{ OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" },
{ OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" },
{ OSC_PCI_EXPRESS_PME_CONTROL, "PME" },
{ OSC_PCI_EXPRESS_AER_CONTROL, "AER" },
{ OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" },
{ OSC_PCI_EXPRESS_LTR_CONTROL, "LTR" },
};
static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word,
struct pci_osc_bit_struct *table, int size)
{
char buf[80];
int i, len = 0;
struct pci_osc_bit_struct *entry;
buf[0] = '\0';
for (i = 0, entry = table; i < size; i++, entry++)
if (word & entry->bit)
len += snprintf(buf + len, sizeof(buf) - len, "%s%s",
len ? " " : "", entry->desc);
dev_info(&root->device->dev,