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OpenCloudOS-Kernel/drivers/pci/hotplug/acpi_pcihp.c

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/*
* Common ACPI functions for hot plug platforms
*
* Copyright (C) 2006 Intel Corporation
*
* All rights reserved.
*
* 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, GOOD TITLE or
* NON INFRINGEMENT. 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Send feedback to <kristen.c.accardi@intel.com>
*
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/pci-acpi.h>
#include <acpi/acpi.h>
#include <acpi/acpi_bus.h>
#define MY_NAME "acpi_pcihp"
#define dbg(fmt, arg...) do { if (debug_acpi) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __func__ , ## arg); } while (0)
#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
#define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)
#define METHOD_NAME__SUN "_SUN"
#define METHOD_NAME__HPP "_HPP"
#define METHOD_NAME_OSHP "OSHP"
static int debug_acpi;
static acpi_status
decode_type0_hpx_record(union acpi_object *record, struct hotplug_params *hpx)
{
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;
hpx->t0 = &hpx->type0_data;
hpx->t0->revision = revision;
hpx->t0->cache_line_size = fields[2].integer.value;
hpx->t0->latency_timer = fields[3].integer.value;
hpx->t0->enable_serr = fields[4].integer.value;
hpx->t0->enable_perr = fields[5].integer.value;
break;
default:
printk(KERN_WARNING
"%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 hotplug_params *hpx)
{
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;
hpx->t1 = &hpx->type1_data;
hpx->t1->revision = revision;
hpx->t1->max_mem_read = fields[2].integer.value;
hpx->t1->avg_max_split = fields[3].integer.value;
hpx->t1->tot_max_split = fields[4].integer.value;
break;
default:
printk(KERN_WARNING
"%s: Type 1 Revision %d record not supported\n",
__func__, revision);
return AE_ERROR;
}
return AE_OK;
}
static acpi_status
decode_type2_hpx_record(union acpi_object *record, struct hotplug_params *hpx)
{
int i;
union acpi_object *fields = record->package.elements;
u32 revision = fields[1].integer.value;
switch (revision) {
case 1:
if (record->package.count != 18)
return AE_ERROR;
for (i = 2; i < 18; i++)
if (fields[i].type != ACPI_TYPE_INTEGER)
return AE_ERROR;
hpx->t2 = &hpx->type2_data;
hpx->t2->revision = revision;
hpx->t2->unc_err_mask_and = fields[2].integer.value;
hpx->t2->unc_err_mask_or = fields[3].integer.value;
hpx->t2->unc_err_sever_and = fields[4].integer.value;
hpx->t2->unc_err_sever_or = fields[5].integer.value;
hpx->t2->cor_err_mask_and = fields[6].integer.value;
hpx->t2->cor_err_mask_or = fields[7].integer.value;
hpx->t2->adv_err_cap_and = fields[8].integer.value;
hpx->t2->adv_err_cap_or = fields[9].integer.value;
hpx->t2->pci_exp_devctl_and = fields[10].integer.value;
hpx->t2->pci_exp_devctl_or = fields[11].integer.value;
hpx->t2->pci_exp_lnkctl_and = fields[12].integer.value;
hpx->t2->pci_exp_lnkctl_or = fields[13].integer.value;
hpx->t2->sec_unc_err_sever_and = fields[14].integer.value;
hpx->t2->sec_unc_err_sever_or = fields[15].integer.value;
hpx->t2->sec_unc_err_mask_and = fields[16].integer.value;
hpx->t2->sec_unc_err_mask_or = fields[17].integer.value;
break;
default:
printk(KERN_WARNING
"%s: Type 2 Revision %d record not supported\n",
__func__, revision);
return AE_ERROR;
}
return AE_OK;
}
static acpi_status
acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
{
acpi_status status;
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
union acpi_object *package, *record, *fields;
u32 type;
int i;
/* Clear the return buffer with zeros */
memset(hpx, 0, sizeof(struct hotplug_params));
status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
if (ACPI_FAILURE(status))
return status;
package = (union acpi_object *)buffer.pointer;
if (package->type != ACPI_TYPE_PACKAGE) {
status = AE_ERROR;
goto exit;
}
for (i = 0; i < package->package.count; i++) {
record = &package->package.elements[i];
if (record->type != ACPI_TYPE_PACKAGE) {
status = AE_ERROR;
goto exit;
}
fields = record->package.elements;
if (fields[0].type != ACPI_TYPE_INTEGER ||
fields[1].type != ACPI_TYPE_INTEGER) {
status = AE_ERROR;
goto exit;
}
type = fields[0].integer.value;
switch (type) {
case 0:
status = decode_type0_hpx_record(record, hpx);
if (ACPI_FAILURE(status))
goto exit;
break;
case 1:
status = decode_type1_hpx_record(record, hpx);
if (ACPI_FAILURE(status))
goto exit;
break;
case 2:
status = decode_type2_hpx_record(record, hpx);
if (ACPI_FAILURE(status))
goto exit;
break;
default:
printk(KERN_ERR "%s: Type %d record not supported\n",
__func__, type);
status = AE_ERROR;
goto exit;
}
}
exit:
kfree(buffer.pointer);
return status;
}
static acpi_status
acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
{
acpi_status status;
u8 nui[4];
struct acpi_buffer ret_buf = { 0, NULL};
struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *ext_obj, *package;
int i, len = 0;
acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
/* Clear the return buffer with zeros */
memset(hpp, 0, sizeof(struct hotplug_params));
/* get _hpp */
status = acpi_evaluate_object(handle, METHOD_NAME__HPP, NULL, &ret_buf);
switch (status) {
case AE_BUFFER_OVERFLOW:
ret_buf.pointer = kmalloc (ret_buf.length, GFP_KERNEL);
if (!ret_buf.pointer) {
printk(KERN_ERR "%s:%s alloc for _HPP fail\n",
__func__, (char *)string.pointer);
kfree(string.pointer);
return AE_NO_MEMORY;
}
status = acpi_evaluate_object(handle, METHOD_NAME__HPP,
NULL, &ret_buf);
if (ACPI_SUCCESS(status))
break;
default:
if (ACPI_FAILURE(status)) {
pr_debug("%s:%s _HPP fail=0x%x\n", __func__,
(char *)string.pointer, status);
kfree(string.pointer);
return status;
}
}
ext_obj = (union acpi_object *) ret_buf.pointer;
if (ext_obj->type != ACPI_TYPE_PACKAGE) {
printk(KERN_ERR "%s:%s _HPP obj not a package\n", __func__,
(char *)string.pointer);
status = AE_ERROR;
goto free_and_return;
}
len = ext_obj->package.count;
package = (union acpi_object *) ret_buf.pointer;
for ( i = 0; (i < len) || (i < 4); i++) {
ext_obj = (union acpi_object *) &package->package.elements[i];
switch (ext_obj->type) {
case ACPI_TYPE_INTEGER:
nui[i] = (u8)ext_obj->integer.value;
break;
default:
printk(KERN_ERR "%s:%s _HPP obj type incorrect\n",
__func__, (char *)string.pointer);
status = AE_ERROR;
goto free_and_return;
}
}
hpp->t0 = &hpp->type0_data;
hpp->t0->cache_line_size = nui[0];
hpp->t0->latency_timer = nui[1];
hpp->t0->enable_serr = nui[2];
hpp->t0->enable_perr = nui[3];
pr_debug(" _HPP: cache_line_size=0x%x\n", hpp->t0->cache_line_size);
pr_debug(" _HPP: latency timer =0x%x\n", hpp->t0->latency_timer);
pr_debug(" _HPP: enable SERR =0x%x\n", hpp->t0->enable_serr);
pr_debug(" _HPP: enable PERR =0x%x\n", hpp->t0->enable_perr);
free_and_return:
kfree(string.pointer);
kfree(ret_buf.pointer);
return status;
}
/* acpi_run_oshp - get control of hotplug from the firmware
*
* @handle - the handle of the hotplug controller.
*/
static acpi_status acpi_run_oshp(acpi_handle handle)
{
acpi_status status;
struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
/* run OSHP */
status = acpi_evaluate_object(handle, METHOD_NAME_OSHP, NULL, NULL);
if (ACPI_FAILURE(status))
if (status != AE_NOT_FOUND)
printk(KERN_ERR "%s:%s OSHP fails=0x%x\n",
__func__, (char *)string.pointer, status);
else
dbg("%s:%s OSHP not found\n",
__func__, (char *)string.pointer);
else
pr_debug("%s:%s OSHP passes\n", __func__,
(char *)string.pointer);
kfree(string.pointer);
return status;
}
/* acpi_get_hp_params_from_firmware
*
* @bus - the pci_bus of the bus on which the device is newly added
* @hpp - allocated by the caller
*/
acpi_status acpi_get_hp_params_from_firmware(struct pci_bus *bus,
struct hotplug_params *hpp)
{
acpi_status status = AE_NOT_FOUND;
acpi_handle handle, phandle;
struct pci_bus *pbus = bus;
struct pci_dev *pdev;
do {
pdev = pbus->self;
if (!pdev) {
handle = acpi_get_pci_rootbridge_handle(
pci_domain_nr(pbus), pbus->number);
break;
}
handle = DEVICE_ACPI_HANDLE(&(pdev->dev));
pbus = pbus->parent;
} while (!handle);
/*
* _HPP settings apply to all child buses, until another _HPP is
* encountered. If we don't find an _HPP for the input pci dev,
* look for it in the parent device scope since that would apply to
* this pci dev. If we don't find any _HPP, use hardcoded defaults
*/
while (handle) {
status = acpi_run_hpx(handle, hpp);
if (ACPI_SUCCESS(status))
break;
status = acpi_run_hpp(handle, hpp);
if (ACPI_SUCCESS(status))
break;
if (acpi_root_bridge(handle))
break;
status = acpi_get_parent(handle, &phandle);
if (ACPI_FAILURE(status))
break;
handle = phandle;
}
return status;
}
EXPORT_SYMBOL_GPL(acpi_get_hp_params_from_firmware);
/**
* acpi_get_hp_hw_control_from_firmware
* @dev: the pci_dev of the bridge that has a hotplug controller
* @flags: requested control bits for _OSC
*
* Attempt to take hotplug control from firmware.
*/
int acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev, u32 flags)
{
acpi_status status;
acpi_handle chandle, handle;
struct pci_dev *pdev = dev;
struct pci_bus *parent;
struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
flags &= (OSC_PCI_EXPRESS_NATIVE_HP_CONTROL |
OSC_SHPC_NATIVE_HP_CONTROL |
OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
if (!flags) {
err("Invalid flags %u specified!\n", flags);
return -EINVAL;
}
/*
* Per PCI firmware specification, we should run the ACPI _OSC
* method to get control of hotplug hardware before using it. If
* an _OSC is missing, we look for an OSHP to do the same thing.
* To handle different BIOS behavior, we look for _OSC on a root
* bridge preferentially (according to PCI fw spec). Later for
* OSHP within the scope of the hotplug controller and its parents,
* upto the host bridge under which this controller exists.
*/
handle = acpi_find_root_bridge_handle(pdev);
if (handle) {
acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
dbg("Trying to get hotplug control for %s\n",
(char *)string.pointer);
status = pci_osc_control_set(handle, flags);
if (ACPI_SUCCESS(status))
goto got_one;
kfree(string.pointer);
string = (struct acpi_buffer){ ACPI_ALLOCATE_BUFFER, NULL };
}
pdev = dev;
handle = DEVICE_ACPI_HANDLE(&dev->dev);
while (!handle) {
/*
* This hotplug controller was not listed in the ACPI name
* space at all. Try to get acpi handle of parent pci bus.
*/
if (!pdev || !pdev->bus->parent)
break;
parent = pdev->bus->parent;
dbg("Could not find %s in acpi namespace, trying parent\n",
pci_name(pdev));
if (!parent->self)
/* Parent must be a host bridge */
handle = acpi_get_pci_rootbridge_handle(
pci_domain_nr(parent),
parent->number);
else
handle = DEVICE_ACPI_HANDLE(&(parent->self->dev));
pdev = parent->self;
}
while (handle) {
acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
dbg("Trying to get hotplug control for %s \n",
(char *)string.pointer);
status = acpi_run_oshp(handle);
if (ACPI_SUCCESS(status))
goto got_one;
if (acpi_root_bridge(handle))
break;
chandle = handle;
status = acpi_get_parent(chandle, &handle);
if (ACPI_FAILURE(status))
break;
}
dbg("Cannot get control of hotplug hardware for pci %s\n",
pci_name(dev));
kfree(string.pointer);
return -ENODEV;
got_one:
dbg("Gained control for hotplug HW for pci %s (%s)\n", pci_name(dev),
(char *)string.pointer);
kfree(string.pointer);
return 0;
}
EXPORT_SYMBOL(acpi_get_hp_hw_control_from_firmware);
/* acpi_root_bridge - check to see if this acpi object is a root bridge
*
* @handle - the acpi object in question.
*/
int acpi_root_bridge(acpi_handle handle)
{
acpi_status status;
struct acpi_device_info *info;
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
int i;
status = acpi_get_object_info(handle, &buffer);
if (ACPI_SUCCESS(status)) {
info = buffer.pointer;
if ((info->valid & ACPI_VALID_HID) &&
!strcmp(PCI_ROOT_HID_STRING,
info->hardware_id.value)) {
kfree(buffer.pointer);
return 1;
}
if (info->valid & ACPI_VALID_CID) {
for (i=0; i < info->compatibility_id.count; i++) {
if (!strcmp(PCI_ROOT_HID_STRING,
info->compatibility_id.id[i].value)) {
kfree(buffer.pointer);
return 1;
}
}
}
kfree(buffer.pointer);
}
return 0;
}
EXPORT_SYMBOL_GPL(acpi_root_bridge);
static int is_ejectable(acpi_handle handle)
{
acpi_status status;
acpi_handle tmp;
unsigned long long removable;
status = acpi_get_handle(handle, "_ADR", &tmp);
if (ACPI_FAILURE(status))
return 0;
status = acpi_get_handle(handle, "_EJ0", &tmp);
if (ACPI_SUCCESS(status))
return 1;
status = acpi_evaluate_integer(handle, "_RMV", NULL, &removable);
if (ACPI_SUCCESS(status) && removable)
return 1;
return 0;
}
/**
* acpi_pcihp_check_ejectable - check if handle is ejectable ACPI PCI slot
* @pbus: the PCI bus of the PCI slot corresponding to 'handle'
* @handle: ACPI handle to check
*
* Return 1 if handle is ejectable PCI slot, 0 otherwise.
*/
int acpi_pci_check_ejectable(struct pci_bus *pbus, acpi_handle handle)
{
acpi_handle bridge_handle, parent_handle;
if (!(bridge_handle = acpi_pci_get_bridge_handle(pbus)))
return 0;
if ((ACPI_FAILURE(acpi_get_parent(handle, &parent_handle))))
return 0;
if (bridge_handle != parent_handle)
return 0;
return is_ejectable(handle);
}
EXPORT_SYMBOL_GPL(acpi_pci_check_ejectable);
static acpi_status
check_hotplug(acpi_handle handle, u32 lvl, void *context, void **rv)
{
int *found = (int *)context;
if (is_ejectable(handle)) {
*found = 1;
return AE_CTRL_TERMINATE;
}
return AE_OK;
}
/**
* acpi_pci_detect_ejectable - check if the PCI bus has ejectable slots
* @pbus - PCI bus to scan
*
* Returns 1 if the PCI bus has ACPI based ejectable slots, 0 otherwise.
*/
int acpi_pci_detect_ejectable(struct pci_bus *pbus)
{
acpi_handle handle;
int found = 0;
if (!(handle = acpi_pci_get_bridge_handle(pbus)))
return 0;
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
check_hotplug, (void *)&found, NULL);
return found;
}
EXPORT_SYMBOL_GPL(acpi_pci_detect_ejectable);
module_param(debug_acpi, bool, 0644);
MODULE_PARM_DESC(debug_acpi, "Debugging mode for ACPI enabled or not");
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