mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
96a3e8af5a
PCI device hotplug - Remove ACPI PCI subdrivers (Jiang Liu, Myron Stowe) - Make acpiphp builtin only, not modular (Jiang Liu) - Add acpiphp mutual exclusion (Jiang Liu) Power management - Skip "PME enabled/disabled" messages when not supported (Rafael Wysocki) - Fix fallback to PCI_D0 (Rafael Wysocki) Miscellaneous - Factor quirk_io_region (Yinghai Lu) - Cache MSI capability offsets & cleanup (Gavin Shan, Bjorn Helgaas) - Clean up EISA resource initialization and logging (Bjorn Helgaas) - Fix prototype warnings (Andy Shevchenko, Bjorn Helgaas) - MIPS: Initialize of_node before scanning bus (Gabor Juhos) - Fix pcibios_get_phb_of_node() declaration "weak" annotation (Gabor Juhos) - Add MSI INTX_DISABLE quirks for AR8161/AR8162/etc (Xiong Huang) - Fix aer_inject return values (Prarit Bhargava) - Remove PME/ACPI dependency (Andrew Murray) - Use shared PCI_BUS_NUM() and PCI_DEVID() (Shuah Khan) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAABAgAGBQJRfhSWAAoJEFmIoMA60/r8GrYQAIHDsyZIuJSf6g+8Td1h+PIC YD3wQhbyrDqQDuKU4+9cz+JsbHmnozUGA4UmlwmOGBxEa/Uauspb6yX1P1+x9Ok1 WD7Ar3BlA5OuYI/1L1mgCiA428MTujwoR4fPnC0+KFy8xk1tBpmhzzeOFohbKyFF hMBO/Xt9tCzPATJ1LhjIH4xAykfDkbnPNHNcUKRoAkRo0CO0lS8gcTk0shXXSNng p9kQ6c4cYZvlRIJTwlawWV09nr7mDsBYa3JClqXYZufUWfEwvIuhisJxCJ57sWi9 t+Ev8dm7VM6Cr5dV+ORArlboBFrq4f/W5U9j9GPFrRplwf+WbNT6tNGSpSDq8XhU Q7JjNgPWVdWXe1vIsMwaO49zi45/bNehuCSFLZiyPZwedMk764tys+iYw+tMRtv1 tBR7lwESSXfagmvWyQAuQOTy6Rj26BPd2T8e2lMsvsuQO9mCyTK6Ey3YyKuqKQK/ l5Gns4vv4eaCjGXqqDGiydUjSes+r/v1bu43XiRnwPQJUKb5kr5SjN5/zSMBuUgm TLT/bnv8qvdFxCpVQJFv4k/uzULARMdbvLtTy8osB14vNHX9jPn+xORjLaZNiO6O 7fFispMU8Om56hNkD6C451r3icRjjGlD7OA8KOlbZ8f876sLzGV9i6P9gwCoRdEB wclDPsN7kAzw/V2sEE60 =bj8i -----END PGP SIGNATURE----- Merge tag 'pci-v3.10-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci Pull PCI updates from Bjorn Helgaas: "PCI changes for the v3.10 merge window: PCI device hotplug - Remove ACPI PCI subdrivers (Jiang Liu, Myron Stowe) - Make acpiphp builtin only, not modular (Jiang Liu) - Add acpiphp mutual exclusion (Jiang Liu) Power management - Skip "PME enabled/disabled" messages when not supported (Rafael Wysocki) - Fix fallback to PCI_D0 (Rafael Wysocki) Miscellaneous - Factor quirk_io_region (Yinghai Lu) - Cache MSI capability offsets & cleanup (Gavin Shan, Bjorn Helgaas) - Clean up EISA resource initialization and logging (Bjorn Helgaas) - Fix prototype warnings (Andy Shevchenko, Bjorn Helgaas) - MIPS: Initialize of_node before scanning bus (Gabor Juhos) - Fix pcibios_get_phb_of_node() declaration "weak" annotation (Gabor Juhos) - Add MSI INTX_DISABLE quirks for AR8161/AR8162/etc (Xiong Huang) - Fix aer_inject return values (Prarit Bhargava) - Remove PME/ACPI dependency (Andrew Murray) - Use shared PCI_BUS_NUM() and PCI_DEVID() (Shuah Khan)" * tag 'pci-v3.10-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (63 commits) vfio-pci: Use cached MSI/MSI-X capabilities vfio-pci: Use PCI_MSIX_TABLE_BIR, not PCI_MSIX_FLAGS_BIRMASK PCI: Remove "extern" from function declarations PCI: Use PCI_MSIX_TABLE_BIR, not PCI_MSIX_FLAGS_BIRMASK PCI: Drop msi_mask_reg() and remove drivers/pci/msi.h PCI: Use msix_table_size() directly, drop multi_msix_capable() PCI: Drop msix_table_offset_reg() and msix_pba_offset_reg() macros PCI: Drop is_64bit_address() and is_mask_bit_support() macros PCI: Drop msi_data_reg() macro PCI: Drop msi_lower_address_reg() and msi_upper_address_reg() macros PCI: Drop msi_control_reg() macro and use PCI_MSI_FLAGS directly PCI: Use cached MSI/MSI-X offsets from dev, not from msi_desc PCI: Clean up MSI/MSI-X capability #defines PCI: Use cached MSI-X cap while enabling MSI-X PCI: Use cached MSI cap while enabling MSI interrupts PCI: Remove MSI/MSI-X cap check in pci_msi_check_device() PCI: Cache MSI/MSI-X capability offsets in struct pci_dev PCI: Use u8, not int, for PM capability offset [SCSI] megaraid_sas: Use correct #define for MSI-X capability PCI: Remove "extern" from function declarations ...
719 lines
19 KiB
C
719 lines
19 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
|
|
*
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
*/
|
|
|
|
#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/acpi.h>
|
|
#include <linux/slab.h>
|
|
#include <acpi/acpi_bus.h>
|
|
#include <acpi/acpi_drivers.h>
|
|
#include <acpi/apei.h>
|
|
|
|
#define PREFIX "ACPI: "
|
|
|
|
#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);
|
|
|
|
#define ACPI_PCIE_REQ_SUPPORT (OSC_EXT_PCI_CONFIG_SUPPORT \
|
|
| OSC_ACTIVE_STATE_PWR_SUPPORT \
|
|
| OSC_CLOCK_PWR_CAPABILITY_SUPPORT \
|
|
| OSC_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,
|
|
};
|
|
|
|
/* Lock to protect both acpi_pci_roots lists */
|
|
static DEFINE_MUTEX(acpi_pci_root_lock);
|
|
static LIST_HEAD(acpi_pci_roots);
|
|
|
|
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;
|
|
|
|
if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
|
|
resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
|
|
resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
|
|
return AE_OK;
|
|
|
|
acpi_resource_to_address64(resource, &address);
|
|
if ((address.address_length > 0) &&
|
|
(address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
|
|
res->start = address.minimum;
|
|
res->end = address.minimum + 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;
|
|
}
|
|
|
|
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_TYPE] = OSC_QUERY_ENABLE;
|
|
capbuf[OSC_SUPPORT_TYPE] = support;
|
|
if (control) {
|
|
*control &= OSC_PCI_CONTROL_MASKS;
|
|
capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set;
|
|
} else {
|
|
/* Run _OSC query for all possible controls. */
|
|
capbuf[OSC_CONTROL_TYPE] = OSC_PCI_CONTROL_MASKS;
|
|
}
|
|
|
|
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;
|
|
acpi_handle tmp;
|
|
|
|
status = acpi_get_handle(root->device->handle, "_OSC", &tmp);
|
|
if (ACPI_FAILURE(status))
|
|
return 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;
|
|
u32 ctrl, capbuf[3];
|
|
acpi_handle tmp;
|
|
|
|
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;
|
|
|
|
status = acpi_get_handle(handle, "_OSC", &tmp);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
|
|
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;
|
|
ctrl = *mask;
|
|
}
|
|
|
|
if ((ctrl & req) != req) {
|
|
status = AE_SUPPORT;
|
|
goto out;
|
|
}
|
|
|
|
capbuf[OSC_QUERY_TYPE] = 0;
|
|
capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set;
|
|
capbuf[OSC_CONTROL_TYPE] = 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 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;
|
|
u32 flags, base_flags;
|
|
|
|
root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
|
|
if (!root)
|
|
return -ENOMEM;
|
|
|
|
segment = 0;
|
|
status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
|
|
&segment);
|
|
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
|
|
printk(KERN_ERR PREFIX "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(device->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;
|
|
printk(KERN_WARNING FW_BUG PREFIX
|
|
"no secondary bus range in _CRS\n");
|
|
status = acpi_evaluate_integer(device->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 {
|
|
printk(KERN_ERR PREFIX "can't evaluate _BBN\n");
|
|
result = -ENODEV;
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
INIT_LIST_HEAD(&root->node);
|
|
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;
|
|
|
|
printk(KERN_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(device->handle);
|
|
|
|
/*
|
|
* All supported architectures that use ACPI have support for
|
|
* PCI domains, so we indicate this in _OSC support capabilities.
|
|
*/
|
|
flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
|
|
acpi_pci_osc_support(root, flags);
|
|
|
|
/*
|
|
* TBD: Need PCI interface for enumeration/configuration of roots.
|
|
*/
|
|
|
|
mutex_lock(&acpi_pci_root_lock);
|
|
list_add_tail(&root->node, &acpi_pci_roots);
|
|
mutex_unlock(&acpi_pci_root_lock);
|
|
|
|
/*
|
|
* 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) {
|
|
printk(KERN_ERR PREFIX
|
|
"Bus %04x:%02x not present in PCI namespace\n",
|
|
root->segment, (unsigned int)root->secondary.start);
|
|
result = -ENODEV;
|
|
goto out_del_root;
|
|
}
|
|
|
|
/* Indicate support for various _OSC capabilities. */
|
|
if (pci_ext_cfg_avail())
|
|
flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
|
|
if (pcie_aspm_support_enabled()) {
|
|
flags |= OSC_ACTIVE_STATE_PWR_SUPPORT |
|
|
OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
|
|
}
|
|
if (pci_msi_enabled())
|
|
flags |= OSC_MSI_SUPPORT;
|
|
if (flags != base_flags) {
|
|
status = acpi_pci_osc_support(root, flags);
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_info(&device->dev, "ACPI _OSC support "
|
|
"notification failed, disabling PCIe ASPM\n");
|
|
pcie_no_aspm();
|
|
flags = base_flags;
|
|
}
|
|
}
|
|
|
|
if (!pcie_ports_disabled
|
|
&& (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) {
|
|
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(&device->dev,
|
|
"PCIe errors handled by BIOS.\n");
|
|
else
|
|
flags |= OSC_PCI_EXPRESS_AER_CONTROL;
|
|
}
|
|
|
|
dev_info(&device->dev,
|
|
"Requesting ACPI _OSC control (0x%02x)\n", flags);
|
|
|
|
status = acpi_pci_osc_control_set(device->handle, &flags,
|
|
OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
|
|
if (ACPI_SUCCESS(status)) {
|
|
dev_info(&device->dev,
|
|
"ACPI _OSC control (0x%02x) granted\n", flags);
|
|
if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
|
|
/*
|
|
* We have ASPM control, but the FADT indicates
|
|
* that it's unsupported. Clear it.
|
|
*/
|
|
pcie_clear_aspm(root->bus);
|
|
}
|
|
} else {
|
|
dev_info(&device->dev,
|
|
"ACPI _OSC request failed (%s), "
|
|
"returned control mask: 0x%02x\n",
|
|
acpi_format_exception(status), flags);
|
|
pr_info("ACPI _OSC control for PCIe not granted, "
|
|
"disabling ASPM\n");
|
|
pcie_no_aspm();
|
|
}
|
|
} else {
|
|
dev_info(&device->dev,
|
|
"Unable to request _OSC control "
|
|
"(_OSC support mask: 0x%02x)\n", flags);
|
|
}
|
|
|
|
pci_acpi_add_bus_pm_notifier(device, root->bus);
|
|
if (device->wakeup.flags.run_wake)
|
|
device_set_run_wake(root->bus->bridge, true);
|
|
|
|
if (system_state != SYSTEM_BOOTING) {
|
|
pcibios_resource_survey_bus(root->bus);
|
|
pci_assign_unassigned_bus_resources(root->bus);
|
|
}
|
|
|
|
/* need to after hot-added ioapic is registered */
|
|
if (system_state != SYSTEM_BOOTING)
|
|
pci_enable_bridges(root->bus);
|
|
|
|
pci_bus_add_devices(root->bus);
|
|
return 1;
|
|
|
|
out_del_root:
|
|
mutex_lock(&acpi_pci_root_lock);
|
|
list_del(&root->node);
|
|
mutex_unlock(&acpi_pci_root_lock);
|
|
|
|
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_stop_root_bus(root->bus);
|
|
|
|
device_set_run_wake(root->bus->bridge, false);
|
|
pci_acpi_remove_bus_pm_notifier(device);
|
|
|
|
pci_remove_root_bus(root->bus);
|
|
|
|
mutex_lock(&acpi_pci_root_lock);
|
|
list_del(&root->node);
|
|
mutex_unlock(&acpi_pci_root_lock);
|
|
kfree(root);
|
|
}
|
|
|
|
void __init acpi_pci_root_init(void)
|
|
{
|
|
acpi_hest_init();
|
|
|
|
if (!acpi_pci_disabled) {
|
|
pci_acpi_crs_quirks();
|
|
acpi_scan_add_handler(&pci_root_handler);
|
|
}
|
|
}
|
|
/* Support root bridge hotplug */
|
|
|
|
static void handle_root_bridge_insertion(acpi_handle handle)
|
|
{
|
|
struct acpi_device *device;
|
|
|
|
if (!acpi_bus_get_device(handle, &device)) {
|
|
printk(KERN_DEBUG "acpi device exists...\n");
|
|
return;
|
|
}
|
|
|
|
if (acpi_bus_scan(handle))
|
|
printk(KERN_ERR "cannot add bridge to acpi list\n");
|
|
}
|
|
|
|
static void handle_root_bridge_removal(struct acpi_device *device)
|
|
{
|
|
acpi_status status;
|
|
struct acpi_eject_event *ej_event;
|
|
|
|
ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
|
|
if (!ej_event) {
|
|
/* Inform firmware the hot-remove operation has error */
|
|
(void) acpi_evaluate_hotplug_ost(device->handle,
|
|
ACPI_NOTIFY_EJECT_REQUEST,
|
|
ACPI_OST_SC_NON_SPECIFIC_FAILURE,
|
|
NULL);
|
|
return;
|
|
}
|
|
|
|
ej_event->device = device;
|
|
ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
|
|
|
|
status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
|
|
if (ACPI_FAILURE(status))
|
|
kfree(ej_event);
|
|
}
|
|
|
|
static void _handle_hotplug_event_root(struct work_struct *work)
|
|
{
|
|
struct acpi_pci_root *root;
|
|
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER };
|
|
struct acpi_hp_work *hp_work;
|
|
acpi_handle handle;
|
|
u32 type;
|
|
|
|
hp_work = container_of(work, struct acpi_hp_work, work);
|
|
handle = hp_work->handle;
|
|
type = hp_work->type;
|
|
|
|
acpi_scan_lock_acquire();
|
|
|
|
root = acpi_pci_find_root(handle);
|
|
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
|
|
|
|
switch (type) {
|
|
case ACPI_NOTIFY_BUS_CHECK:
|
|
/* bus enumerate */
|
|
printk(KERN_DEBUG "%s: Bus check notify on %s\n", __func__,
|
|
(char *)buffer.pointer);
|
|
if (!root)
|
|
handle_root_bridge_insertion(handle);
|
|
|
|
break;
|
|
|
|
case ACPI_NOTIFY_DEVICE_CHECK:
|
|
/* device check */
|
|
printk(KERN_DEBUG "%s: Device check notify on %s\n", __func__,
|
|
(char *)buffer.pointer);
|
|
if (!root)
|
|
handle_root_bridge_insertion(handle);
|
|
break;
|
|
|
|
case ACPI_NOTIFY_EJECT_REQUEST:
|
|
/* request device eject */
|
|
printk(KERN_DEBUG "%s: Device eject notify on %s\n", __func__,
|
|
(char *)buffer.pointer);
|
|
if (root)
|
|
handle_root_bridge_removal(root->device);
|
|
break;
|
|
default:
|
|
printk(KERN_WARNING "notify_handler: unknown event type 0x%x for %s\n",
|
|
type, (char *)buffer.pointer);
|
|
break;
|
|
}
|
|
|
|
acpi_scan_lock_release();
|
|
kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
|
|
kfree(buffer.pointer);
|
|
}
|
|
|
|
static void handle_hotplug_event_root(acpi_handle handle, u32 type,
|
|
void *context)
|
|
{
|
|
alloc_acpi_hp_work(handle, type, context,
|
|
_handle_hotplug_event_root);
|
|
}
|
|
|
|
static acpi_status __init
|
|
find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
|
|
{
|
|
acpi_status status;
|
|
char objname[64];
|
|
struct acpi_buffer buffer = { .length = sizeof(objname),
|
|
.pointer = objname };
|
|
int *count = (int *)context;
|
|
|
|
if (!acpi_is_root_bridge(handle))
|
|
return AE_OK;
|
|
|
|
(*count)++;
|
|
|
|
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
|
|
|
|
status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
|
|
handle_hotplug_event_root, NULL);
|
|
if (ACPI_FAILURE(status))
|
|
printk(KERN_DEBUG "acpi root: %s notify handler is not installed, exit status: %u\n",
|
|
objname, (unsigned int)status);
|
|
else
|
|
printk(KERN_DEBUG "acpi root: %s notify handler is installed\n",
|
|
objname);
|
|
|
|
return AE_OK;
|
|
}
|
|
|
|
void __init acpi_pci_root_hp_init(void)
|
|
{
|
|
int num = 0;
|
|
|
|
acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
|
|
ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL);
|
|
|
|
printk(KERN_DEBUG "Found %d acpi root devices\n", num);
|
|
}
|