mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 18:30:06 +00:00
![Liu Jiang](/assets/img/avatar_default.png)
Commit4d6b4e69a2
("x86/PCI/ACPI: Use common interface to support PCI host bridge") converted x86 to use the common interface acpi_pci_root_create, but the conversion missed on code piece in arch/x86/pci/bus_numa.c, which causes regression on some legacy AMD platforms as reported by Arthur Marsh <arthur.marsh@internode.on.net>. The root causes is that acpi_pci_root_create() fails to insert host bridge resources into iomem_resource/ioport_resource because x86_pci_root_bus_resources() has already inserted those resources. So change x86_pci_root_bus_resources() to not insert resources into iomem_resource/ioport_resource. Fixes:4d6b4e69a2
("x86/PCI/ACPI: Use common interface to support PCI host bridge") Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Reported-and-tested-by: Arthur Marsh <arthur.marsh@internode.on.net> Reported-and-tested-by: Krzysztof Kolasa <kkolasa@winsoft.pl> Reported-and-tested-by: Keith Busch <keith.busch@intel.com> Reported-and-tested-by: Hans de Bruin <jmdebruin@xmsnet.nl> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
874 lines
23 KiB
C
874 lines
23 KiB
C
/*
|
|
* 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>
|
|
*
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or (at
|
|
* your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
*/
|
|
|
|
#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 <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" },
|
|
};
|
|
|
|
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" },
|
|
};
|
|
|
|
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, "_OSC: %s [%s]\n", msg, buf);
|
|
}
|
|
|
|
static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word)
|
|
{
|
|
decode_osc_bits(root, msg, word, pci_osc_support_bit,
|
|
ARRAY_SIZE(pci_osc_support_bit));
|
|
}
|
|
|
|
static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word)
|
|
{
|
|
decode_osc_bits(root, msg, word, pci_osc_control_bit,
|
|
ARRAY_SIZE(pci_osc_control_bit));
|
|
}
|
|
|
|
static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
|
|
|
|
static acpi_status acpi_pci_run_osc(acpi_handle handle,
|
|
const u32 *capbuf, u32 *retval)
|
|
{
|
|
struct acpi_osc_context context = {
|
|
.uuid_str = pci_osc_uuid_str,
|
|
.rev = 1,
|
|
.cap.length = 12,
|
|
.cap.pointer = (void *)capbuf,
|
|
};
|
|
acpi_status status;
|
|
|
|
status = acpi_run_osc(handle, &context);
|
|
if (ACPI_SUCCESS(status)) {
|
|
*retval = *((u32 *)(context.ret.pointer + 8));
|
|
kfree(context.ret.pointer);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
|
|
u32 support,
|
|
u32 *control)
|
|
{
|
|
acpi_status status;
|
|
u32 result, capbuf[3];
|
|
|
|
support &= OSC_PCI_SUPPORT_MASKS;
|
|
support |= root->osc_support_set;
|
|
|
|
capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
|
|
capbuf[OSC_SUPPORT_DWORD] = support;
|
|
if (control) {
|
|
*control &= OSC_PCI_CONTROL_MASKS;
|
|
capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set;
|
|
} else {
|
|
/* Run _OSC query only with existing controls. */
|
|
capbuf[OSC_CONTROL_DWORD] = root->osc_control_set;
|
|
}
|
|
|
|
status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
|
|
if (ACPI_SUCCESS(status)) {
|
|
root->osc_support_set = support;
|
|
if (control)
|
|
*control = result;
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
|
|
{
|
|
acpi_status status;
|
|
|
|
mutex_lock(&osc_lock);
|
|
status = acpi_pci_query_osc(root, flags, NULL);
|
|
mutex_unlock(&osc_lock);
|
|
return status;
|
|
}
|
|
|
|
struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
|
|
{
|
|
struct acpi_pci_root *root;
|
|
struct acpi_device *device;
|
|
|
|
if (acpi_bus_get_device(handle, &device) ||
|
|
acpi_match_device_ids(device, root_device_ids))
|
|
return NULL;
|
|
|
|
root = acpi_driver_data(device);
|
|
|
|
return root;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_pci_find_root);
|
|
|
|
struct acpi_handle_node {
|
|
struct list_head node;
|
|
acpi_handle handle;
|
|
};
|
|
|
|
/**
|
|
* acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
|
|
* @handle: the handle in question
|
|
*
|
|
* Given an ACPI CA handle, the desired PCI device is located in the
|
|
* list of PCI devices.
|
|
*
|
|
* If the device is found, its reference count is increased and this
|
|
* function returns a pointer to its data structure. The caller must
|
|
* decrement the reference count by calling pci_dev_put().
|
|
* If no device is found, %NULL is returned.
|
|
*/
|
|
struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
|
|
{
|
|
int dev, fn;
|
|
unsigned long long adr;
|
|
acpi_status status;
|
|
acpi_handle phandle;
|
|
struct pci_bus *pbus;
|
|
struct pci_dev *pdev = NULL;
|
|
struct acpi_handle_node *node, *tmp;
|
|
struct acpi_pci_root *root;
|
|
LIST_HEAD(device_list);
|
|
|
|
/*
|
|
* Walk up the ACPI CA namespace until we reach a PCI root bridge.
|
|
*/
|
|
phandle = handle;
|
|
while (!acpi_is_root_bridge(phandle)) {
|
|
node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
|
|
if (!node)
|
|
goto out;
|
|
|
|
INIT_LIST_HEAD(&node->node);
|
|
node->handle = phandle;
|
|
list_add(&node->node, &device_list);
|
|
|
|
status = acpi_get_parent(phandle, &phandle);
|
|
if (ACPI_FAILURE(status))
|
|
goto out;
|
|
}
|
|
|
|
root = acpi_pci_find_root(phandle);
|
|
if (!root)
|
|
goto out;
|
|
|
|
pbus = root->bus;
|
|
|
|
/*
|
|
* Now, walk back down the PCI device tree until we return to our
|
|
* original handle. Assumes that everything between the PCI root
|
|
* bridge and the device we're looking for must be a P2P bridge.
|
|
*/
|
|
list_for_each_entry(node, &device_list, node) {
|
|
acpi_handle hnd = node->handle;
|
|
status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
|
|
if (ACPI_FAILURE(status))
|
|
goto out;
|
|
dev = (adr >> 16) & 0xffff;
|
|
fn = adr & 0xffff;
|
|
|
|
pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
|
|
if (!pdev || hnd == handle)
|
|
break;
|
|
|
|
pbus = pdev->subordinate;
|
|
pci_dev_put(pdev);
|
|
|
|
/*
|
|
* This function may be called for a non-PCI device that has a
|
|
* PCI parent (eg. a disk under a PCI SATA controller). In that
|
|
* case pdev->subordinate will be NULL for the parent.
|
|
*/
|
|
if (!pbus) {
|
|
dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
|
|
pdev = NULL;
|
|
break;
|
|
}
|
|
}
|
|
out:
|
|
list_for_each_entry_safe(node, tmp, &device_list, node)
|
|
kfree(node);
|
|
|
|
return pdev;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
|
|
|
|
/**
|
|
* acpi_pci_osc_control_set - Request control of PCI root _OSC features.
|
|
* @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
|
|
* @mask: Mask of _OSC bits to request control of, place to store control mask.
|
|
* @req: Mask of _OSC bits the control of is essential to the caller.
|
|
*
|
|
* Run _OSC query for @mask and if that is successful, compare the returned
|
|
* mask of control bits with @req. If all of the @req bits are set in the
|
|
* returned mask, run _OSC request for it.
|
|
*
|
|
* The variable at the @mask address may be modified regardless of whether or
|
|
* not the function returns success. On success it will contain the mask of
|
|
* _OSC bits the BIOS has granted control of, but its contents are meaningless
|
|
* on failure.
|
|
**/
|
|
acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
|
|
{
|
|
struct acpi_pci_root *root;
|
|
acpi_status status = AE_OK;
|
|
u32 ctrl, capbuf[3];
|
|
|
|
if (!mask)
|
|
return AE_BAD_PARAMETER;
|
|
|
|
ctrl = *mask & OSC_PCI_CONTROL_MASKS;
|
|
if ((ctrl & req) != req)
|
|
return AE_TYPE;
|
|
|
|
root = acpi_pci_find_root(handle);
|
|
if (!root)
|
|
return AE_NOT_EXIST;
|
|
|
|
mutex_lock(&osc_lock);
|
|
|
|
*mask = ctrl | root->osc_control_set;
|
|
/* No need to evaluate _OSC if the control was already granted. */
|
|
if ((root->osc_control_set & ctrl) == ctrl)
|
|
goto out;
|
|
|
|
/* Need to check the available controls bits before requesting them. */
|
|
while (*mask) {
|
|
status = acpi_pci_query_osc(root, root->osc_support_set, mask);
|
|
if (ACPI_FAILURE(status))
|
|
goto out;
|
|
if (ctrl == *mask)
|
|
break;
|
|
decode_osc_control(root, "platform does not support",
|
|
ctrl & ~(*mask));
|
|
ctrl = *mask;
|
|
}
|
|
|
|
if ((ctrl & req) != req) {
|
|
decode_osc_control(root, "not requesting control; platform does not support",
|
|
req & ~(ctrl));
|
|
status = AE_SUPPORT;
|
|
goto out;
|
|
}
|
|
|
|
capbuf[OSC_QUERY_DWORD] = 0;
|
|
capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set;
|
|
capbuf[OSC_CONTROL_DWORD] = ctrl;
|
|
status = acpi_pci_run_osc(handle, capbuf, mask);
|
|
if (ACPI_SUCCESS(status))
|
|
root->osc_control_set = *mask;
|
|
out:
|
|
mutex_unlock(&osc_lock);
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL(acpi_pci_osc_control_set);
|
|
|
|
static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm)
|
|
{
|
|
u32 support, control, requested;
|
|
acpi_status status;
|
|
struct acpi_device *device = root->device;
|
|
acpi_handle handle = device->handle;
|
|
|
|
/*
|
|
* Apple always return failure on _OSC calls when _OSI("Darwin") has
|
|
* been called successfully. We know the feature set supported by the
|
|
* platform, so avoid calling _OSC at all
|
|
*/
|
|
|
|
if (dmi_match(DMI_SYS_VENDOR, "Apple Inc.")) {
|
|
root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL;
|
|
decode_osc_control(root, "OS assumes control of",
|
|
root->osc_control_set);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* All supported architectures that use ACPI have support for
|
|
* PCI domains, so we indicate this in _OSC support capabilities.
|
|
*/
|
|
support = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
|
|
if (pci_ext_cfg_avail())
|
|
support |= OSC_PCI_EXT_CONFIG_SUPPORT;
|
|
if (pcie_aspm_support_enabled())
|
|
support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT;
|
|
if (pci_msi_enabled())
|
|
support |= OSC_PCI_MSI_SUPPORT;
|
|
|
|
decode_osc_support(root, "OS supports", support);
|
|
status = acpi_pci_osc_support(root, support);
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n",
|
|
acpi_format_exception(status));
|
|
*no_aspm = 1;
|
|
return;
|
|
}
|
|
|
|
if (pcie_ports_disabled) {
|
|
dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n");
|
|
return;
|
|
}
|
|
|
|
if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) {
|
|
decode_osc_support(root, "not requesting OS control; OS requires",
|
|
ACPI_PCIE_REQ_SUPPORT);
|
|
return;
|
|
}
|
|
|
|
control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL
|
|
| OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
|
|
| OSC_PCI_EXPRESS_PME_CONTROL;
|
|
|
|
if (pci_aer_available()) {
|
|
if (aer_acpi_firmware_first())
|
|
dev_info(&device->dev,
|
|
"PCIe AER handled by firmware\n");
|
|
else
|
|
control |= OSC_PCI_EXPRESS_AER_CONTROL;
|
|
}
|
|
|
|
requested = control;
|
|
status = acpi_pci_osc_control_set(handle, &control,
|
|
OSC_PCI_EXPRESS_CAPABILITY_CONTROL);
|
|
if (ACPI_SUCCESS(status)) {
|
|
decode_osc_control(root, "OS now controls", control);
|
|
if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
|
|
/*
|
|
* We have ASPM control, but the FADT indicates that
|
|
* it's unsupported. Leave existing configuration
|
|
* intact and prevent the OS from touching it.
|
|
*/
|
|
dev_info(&device->dev, "FADT indicates ASPM is unsupported, using BIOS configuration\n");
|
|
*no_aspm = 1;
|
|
}
|
|
} else {
|
|
decode_osc_control(root, "OS requested", requested);
|
|
decode_osc_control(root, "platform willing to grant", control);
|
|
dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n",
|
|
acpi_format_exception(status));
|
|
|
|
/*
|
|
* We want to disable ASPM here, but aspm_disabled
|
|
* needs to remain in its state from boot so that we
|
|
* properly handle PCIe 1.1 devices. So we set this
|
|
* flag here, to defer the action until after the ACPI
|
|
* root scan.
|
|
*/
|
|
*no_aspm = 1;
|
|
}
|
|
}
|
|
|
|
static int acpi_pci_root_add(struct acpi_device *device,
|
|
const struct acpi_device_id *not_used)
|
|
{
|
|
unsigned long long segment, bus;
|
|
acpi_status status;
|
|
int result;
|
|
struct acpi_pci_root *root;
|
|
acpi_handle handle = device->handle;
|
|
int no_aspm = 0;
|
|
bool hotadd = system_state != SYSTEM_BOOTING;
|
|
|
|
root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
|
|
if (!root)
|
|
return -ENOMEM;
|
|
|
|
segment = 0;
|
|
status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL,
|
|
&segment);
|
|
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
|
|
dev_err(&device->dev, "can't evaluate _SEG\n");
|
|
result = -ENODEV;
|
|
goto end;
|
|
}
|
|
|
|
/* Check _CRS first, then _BBN. If no _BBN, default to zero. */
|
|
root->secondary.flags = IORESOURCE_BUS;
|
|
status = try_get_root_bridge_busnr(handle, &root->secondary);
|
|
if (ACPI_FAILURE(status)) {
|
|
/*
|
|
* We need both the start and end of the downstream bus range
|
|
* to interpret _CBA (MMCONFIG base address), so it really is
|
|
* supposed to be in _CRS. If we don't find it there, all we
|
|
* can do is assume [_BBN-0xFF] or [0-0xFF].
|
|
*/
|
|
root->secondary.end = 0xFF;
|
|
dev_warn(&device->dev,
|
|
FW_BUG "no secondary bus range in _CRS\n");
|
|
status = acpi_evaluate_integer(handle, METHOD_NAME__BBN,
|
|
NULL, &bus);
|
|
if (ACPI_SUCCESS(status))
|
|
root->secondary.start = bus;
|
|
else if (status == AE_NOT_FOUND)
|
|
root->secondary.start = 0;
|
|
else {
|
|
dev_err(&device->dev, "can't evaluate _BBN\n");
|
|
result = -ENODEV;
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
root->device = device;
|
|
root->segment = segment & 0xFFFF;
|
|
strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
|
|
strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
|
|
device->driver_data = root;
|
|
|
|
if (hotadd && dmar_device_add(handle)) {
|
|
result = -ENXIO;
|
|
goto end;
|
|
}
|
|
|
|
pr_info(PREFIX "%s [%s] (domain %04x %pR)\n",
|
|
acpi_device_name(device), acpi_device_bid(device),
|
|
root->segment, &root->secondary);
|
|
|
|
root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle);
|
|
|
|
negotiate_os_control(root, &no_aspm);
|
|
|
|
/*
|
|
* TBD: Need PCI interface for enumeration/configuration of roots.
|
|
*/
|
|
|
|
/*
|
|
* Scan the Root Bridge
|
|
* --------------------
|
|
* Must do this prior to any attempt to bind the root device, as the
|
|
* PCI namespace does not get created until this call is made (and
|
|
* thus the root bridge's pci_dev does not exist).
|
|
*/
|
|
root->bus = pci_acpi_scan_root(root);
|
|
if (!root->bus) {
|
|
dev_err(&device->dev,
|
|
"Bus %04x:%02x not present in PCI namespace\n",
|
|
root->segment, (unsigned int)root->secondary.start);
|
|
device->driver_data = NULL;
|
|
result = -ENODEV;
|
|
goto remove_dmar;
|
|
}
|
|
|
|
if (no_aspm)
|
|
pcie_no_aspm();
|
|
|
|
pci_acpi_add_bus_pm_notifier(device);
|
|
if (device->wakeup.flags.run_wake)
|
|
device_set_run_wake(root->bus->bridge, true);
|
|
|
|
if (hotadd) {
|
|
pcibios_resource_survey_bus(root->bus);
|
|
pci_assign_unassigned_root_bus_resources(root->bus);
|
|
acpi_ioapic_add(root);
|
|
}
|
|
|
|
pci_lock_rescan_remove();
|
|
pci_bus_add_devices(root->bus);
|
|
pci_unlock_rescan_remove();
|
|
return 1;
|
|
|
|
remove_dmar:
|
|
if (hotadd)
|
|
dmar_device_remove(handle);
|
|
end:
|
|
kfree(root);
|
|
return result;
|
|
}
|
|
|
|
static void acpi_pci_root_remove(struct acpi_device *device)
|
|
{
|
|
struct acpi_pci_root *root = acpi_driver_data(device);
|
|
|
|
pci_lock_rescan_remove();
|
|
|
|
pci_stop_root_bus(root->bus);
|
|
|
|
WARN_ON(acpi_ioapic_remove(root));
|
|
|
|
device_set_run_wake(root->bus->bridge, false);
|
|
pci_acpi_remove_bus_pm_notifier(device);
|
|
|
|
pci_remove_root_bus(root->bus);
|
|
|
|
dmar_device_remove(device->handle);
|
|
|
|
pci_unlock_rescan_remove();
|
|
|
|
kfree(root);
|
|
}
|
|
|
|
/*
|
|
* Following code to support acpi_pci_root_create() is copied from
|
|
* arch/x86/pci/acpi.c and modified so it could be reused by x86, IA64
|
|
* and ARM64.
|
|
*/
|
|
static void acpi_pci_root_validate_resources(struct device *dev,
|
|
struct list_head *resources,
|
|
unsigned long type)
|
|
{
|
|
LIST_HEAD(list);
|
|
struct resource *res1, *res2, *root = NULL;
|
|
struct resource_entry *tmp, *entry, *entry2;
|
|
|
|
BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0);
|
|
root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource;
|
|
|
|
list_splice_init(resources, &list);
|
|
resource_list_for_each_entry_safe(entry, tmp, &list) {
|
|
bool free = false;
|
|
resource_size_t end;
|
|
|
|
res1 = entry->res;
|
|
if (!(res1->flags & type))
|
|
goto next;
|
|
|
|
/* Exclude non-addressable range or non-addressable portion */
|
|
end = min(res1->end, root->end);
|
|
if (end <= res1->start) {
|
|
dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n",
|
|
res1);
|
|
free = true;
|
|
goto next;
|
|
} else if (res1->end != end) {
|
|
dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n",
|
|
res1, (unsigned long long)end + 1,
|
|
(unsigned long long)res1->end);
|
|
res1->end = end;
|
|
}
|
|
|
|
resource_list_for_each_entry(entry2, resources) {
|
|
res2 = entry2->res;
|
|
if (!(res2->flags & type))
|
|
continue;
|
|
|
|
/*
|
|
* I don't like throwing away windows because then
|
|
* our resources no longer match the ACPI _CRS, but
|
|
* the kernel resource tree doesn't allow overlaps.
|
|
*/
|
|
if (resource_overlaps(res1, res2)) {
|
|
res2->start = min(res1->start, res2->start);
|
|
res2->end = max(res1->end, res2->end);
|
|
dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n",
|
|
res2, res1);
|
|
free = true;
|
|
goto next;
|
|
}
|
|
}
|
|
|
|
next:
|
|
resource_list_del(entry);
|
|
if (free)
|
|
resource_list_free_entry(entry);
|
|
else
|
|
resource_list_add_tail(entry, resources);
|
|
}
|
|
}
|
|
|
|
int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info)
|
|
{
|
|
int ret;
|
|
struct list_head *list = &info->resources;
|
|
struct acpi_device *device = info->bridge;
|
|
struct resource_entry *entry, *tmp;
|
|
unsigned long flags;
|
|
|
|
flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT;
|
|
ret = acpi_dev_get_resources(device, list,
|
|
acpi_dev_filter_resource_type_cb,
|
|
(void *)flags);
|
|
if (ret < 0)
|
|
dev_warn(&device->dev,
|
|
"failed to parse _CRS method, error code %d\n", ret);
|
|
else if (ret == 0)
|
|
dev_dbg(&device->dev,
|
|
"no IO and memory resources present in _CRS\n");
|
|
else {
|
|
resource_list_for_each_entry_safe(entry, tmp, list) {
|
|
if (entry->res->flags & IORESOURCE_DISABLED)
|
|
resource_list_destroy_entry(entry);
|
|
else
|
|
entry->res->name = info->name;
|
|
}
|
|
acpi_pci_root_validate_resources(&device->dev, list,
|
|
IORESOURCE_MEM);
|
|
acpi_pci_root_validate_resources(&device->dev, list,
|
|
IORESOURCE_IO);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info)
|
|
{
|
|
struct resource_entry *entry, *tmp;
|
|
struct resource *res, *conflict, *root = NULL;
|
|
|
|
resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
|
|
res = entry->res;
|
|
if (res->flags & IORESOURCE_MEM)
|
|
root = &iomem_resource;
|
|
else if (res->flags & IORESOURCE_IO)
|
|
root = &ioport_resource;
|
|
else
|
|
continue;
|
|
|
|
/*
|
|
* Some legacy x86 host bridge drivers use iomem_resource and
|
|
* ioport_resource as default resource pool, skip it.
|
|
*/
|
|
if (res == root)
|
|
continue;
|
|
|
|
conflict = insert_resource_conflict(root, res);
|
|
if (conflict) {
|
|
dev_info(&info->bridge->dev,
|
|
"ignoring host bridge window %pR (conflicts with %s %pR)\n",
|
|
res, conflict->name, conflict);
|
|
resource_list_destroy_entry(entry);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info)
|
|
{
|
|
struct resource *res;
|
|
struct resource_entry *entry, *tmp;
|
|
|
|
if (!info)
|
|
return;
|
|
|
|
resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
|
|
res = entry->res;
|
|
if (res->parent &&
|
|
(res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
|
|
release_resource(res);
|
|
resource_list_destroy_entry(entry);
|
|
}
|
|
|
|
info->ops->release_info(info);
|
|
}
|
|
|
|
static void acpi_pci_root_release_info(struct pci_host_bridge *bridge)
|
|
{
|
|
struct resource *res;
|
|
struct resource_entry *entry;
|
|
|
|
resource_list_for_each_entry(entry, &bridge->windows) {
|
|
res = entry->res;
|
|
if (res->parent &&
|
|
(res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
|
|
release_resource(res);
|
|
}
|
|
__acpi_pci_root_release_info(bridge->release_data);
|
|
}
|
|
|
|
struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
|
|
struct acpi_pci_root_ops *ops,
|
|
struct acpi_pci_root_info *info,
|
|
void *sysdata)
|
|
{
|
|
int ret, busnum = root->secondary.start;
|
|
struct acpi_device *device = root->device;
|
|
int node = acpi_get_node(device->handle);
|
|
struct pci_bus *bus;
|
|
|
|
info->root = root;
|
|
info->bridge = device;
|
|
info->ops = ops;
|
|
INIT_LIST_HEAD(&info->resources);
|
|
snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x",
|
|
root->segment, busnum);
|
|
|
|
if (ops->init_info && ops->init_info(info))
|
|
goto out_release_info;
|
|
if (ops->prepare_resources)
|
|
ret = ops->prepare_resources(info);
|
|
else
|
|
ret = acpi_pci_probe_root_resources(info);
|
|
if (ret < 0)
|
|
goto out_release_info;
|
|
|
|
pci_acpi_root_add_resources(info);
|
|
pci_add_resource(&info->resources, &root->secondary);
|
|
bus = pci_create_root_bus(NULL, busnum, ops->pci_ops,
|
|
sysdata, &info->resources);
|
|
if (!bus)
|
|
goto out_release_info;
|
|
|
|
pci_scan_child_bus(bus);
|
|
pci_set_host_bridge_release(to_pci_host_bridge(bus->bridge),
|
|
acpi_pci_root_release_info, info);
|
|
if (node != NUMA_NO_NODE)
|
|
dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
|
|
return bus;
|
|
|
|
out_release_info:
|
|
__acpi_pci_root_release_info(info);
|
|
return NULL;
|
|
}
|
|
|
|
void __init acpi_pci_root_init(void)
|
|
{
|
|
acpi_hest_init();
|
|
if (acpi_pci_disabled)
|
|
return;
|
|
|
|
pci_acpi_crs_quirks();
|
|
acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root");
|
|
}
|