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PCI/ACPI: Handle PCI slot devices when creating/destroying PCI buses

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Currently the pci_slot driver doesn't update PCI slot devices when PCI
device hotplug event happens, which may cause memory leak and returning
stale information to user.

Now the pci_slot driver has been changed as built-in driver, so invoke
PCI slot enumeration and destroy routines directly from the PCI core.
And remove ACPI PCI sub-driver related code because it isn't needed
any more.

[bhelgas: removed "extern" from function declarations]
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Toshi Kani <toshi.kani@hp.com>
This commit is contained in:
Jiang Liu 2013-04-12 05:44:24 +00:00 • committed by Bjorn Helgaas
parent 89016506b6
commit 5c0b04e3d9
4 changed files with 41 additions and 149 deletions
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170
drivers/acpi/pci_slot.c
View file

@ -9,6 +9,9 @@
* Copyright (C) 2007-2008 Hewlett-Packard Development Company, L.P.
* Alex Chiang <achiang@hp.com>
*
* Copyright (C) 2013 Huawei Tech. Co., Ltd.
* Jiang Liu <jiang.liu@huawei.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
@ -28,10 +31,9 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/pci.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <linux/dmi.h>
static bool debug;
@ -61,20 +63,12 @@ ACPI_MODULE_NAME("pci_slot");
#define SLOT_NAME_SIZE 21 /* Inspired by #define in acpiphp.h */
struct acpi_pci_slot {
acpi_handle root_handle; /* handle of the root bridge */
struct pci_slot *pci_slot; /* corresponding pci_slot */
struct list_head list; /* node in the list of slots */
};
static int acpi_pci_slot_add(struct acpi_pci_root *root);
static void acpi_pci_slot_remove(struct acpi_pci_root *root);
static LIST_HEAD(slot_list);
static DEFINE_MUTEX(slot_list_lock);
static struct acpi_pci_driver acpi_pci_slot_driver = {
.add = acpi_pci_slot_add,
.remove = acpi_pci_slot_remove,
};
static int
check_slot(acpi_handle handle, unsigned long long *sun)
@ -113,21 +107,8 @@ out:
return device;
}
struct callback_args {
acpi_walk_callback user_function; /* only for walk_p2p_bridge */
struct pci_bus *pci_bus;
acpi_handle root_handle;
};
/*
* register_slot
*
* Called once for each SxFy object in the namespace. Don't worry about
* calling pci_create_slot multiple times for the same pci_bus:device,
* since each subsequent call simply bumps the refcount on the pci_slot.
*
* The number of calls to pci_destroy_slot from unregister_slot is
* symmetrical.
* Check whether handle has an associated slot and create PCI slot if it has.
*/
static acpi_status
register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
@ -137,13 +118,22 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
char name[SLOT_NAME_SIZE];
struct acpi_pci_slot *slot;
struct pci_slot *pci_slot;
struct callback_args *parent_context = context;
struct pci_bus *pci_bus = parent_context->pci_bus;
struct pci_bus *pci_bus = context;
device = check_slot(handle, &sun);
if (device < 0)
return AE_OK;
/*
* There may be multiple PCI functions associated with the same slot.
* Check whether PCI slot has already been created for this PCI device.
*/
list_for_each_entry(slot, &slot_list, list) {
pci_slot = slot->pci_slot;
if (pci_slot->bus == pci_bus && pci_slot->number == device)
return AE_OK;
}
slot = kmalloc(sizeof(*slot), GFP_KERNEL);
if (!slot) {
err("%s: cannot allocate memory\n", __func__);
@ -158,12 +148,8 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
return AE_OK;
}
slot->root_handle = parent_context->root_handle;
slot->pci_slot = pci_slot;
INIT_LIST_HEAD(&slot->list);
mutex_lock(&slot_list_lock);
list_add(&slot->list, &slot_list);
mutex_unlock(&slot_list_lock);
get_device(&pci_bus->dev);
@ -173,131 +159,24 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
return AE_OK;
}
/*
* walk_p2p_bridge - discover and walk p2p bridges
* @handle: points to an acpi_pci_root
* @context: p2p_bridge_context pointer
*
* Note that when we call ourselves recursively, we pass a different
* value of pci_bus in the child_context.
*/
static acpi_status
walk_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
void acpi_pci_slot_enumerate(struct pci_bus *bus, acpi_handle handle)
{
int device, function;
unsigned long long adr;
acpi_status status;
acpi_handle dummy_handle;
acpi_walk_callback user_function;
struct pci_dev *dev;
struct pci_bus *pci_bus;
struct callback_args child_context;
struct callback_args *parent_context = context;
pci_bus = parent_context->pci_bus;
user_function = parent_context->user_function;
status = acpi_get_handle(handle, "_ADR", &dummy_handle);
if (ACPI_FAILURE(status))
return AE_OK;
status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
if (ACPI_FAILURE(status))
return AE_OK;
device = (adr >> 16) & 0xffff;
function = adr & 0xffff;
dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
if (!dev || !dev->subordinate)
goto out;
child_context.pci_bus = dev->subordinate;
child_context.user_function = user_function;
child_context.root_handle = parent_context->root_handle;
dbg("p2p bridge walk, pci_bus = %x\n", dev->subordinate->number);
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
user_function, NULL, &child_context, NULL);
if (ACPI_FAILURE(status))
goto out;
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
walk_p2p_bridge, NULL, &child_context, NULL);
out:
pci_dev_put(dev);
return AE_OK;
mutex_lock(&slot_list_lock);
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
register_slot, NULL, bus, NULL);
mutex_unlock(&slot_list_lock);
}
/*
* walk_root_bridge - generic root bridge walker
* @root: poiner of an acpi_pci_root
* @user_function: user callback for slot objects
*
* Call user_function for all objects underneath this root bridge.
* Walk p2p bridges underneath us and call user_function on those too.
*/
static int
walk_root_bridge(struct acpi_pci_root *root, acpi_walk_callback user_function)
{
acpi_status status;
acpi_handle handle = root->device->handle;
struct pci_bus *pci_bus = root->bus;
struct callback_args context;
context.pci_bus = pci_bus;
context.user_function = user_function;
context.root_handle = handle;
dbg("root bridge walk, pci_bus = %x\n", pci_bus->number);
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
user_function, NULL, &context, NULL);
if (ACPI_FAILURE(status))
return status;
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
walk_p2p_bridge, NULL, &context, NULL);
if (ACPI_FAILURE(status))
err("%s: walk_p2p_bridge failure - %d\n", __func__, status);
return status;
}
/*
* acpi_pci_slot_add
* @handle: points to an acpi_pci_root
*/
static int
acpi_pci_slot_add(struct acpi_pci_root *root)
{
acpi_status status;
status = walk_root_bridge(root, register_slot);
if (ACPI_FAILURE(status))
err("%s: register_slot failure - %d\n", __func__, status);
return status;
}
/*
* acpi_pci_slot_remove
* @handle: points to an acpi_pci_root
*/
static void
acpi_pci_slot_remove(struct acpi_pci_root *root)
void acpi_pci_slot_remove(struct pci_bus *bus)
{
struct acpi_pci_slot *slot, *tmp;
struct pci_bus *pbus;
acpi_handle handle = root->device->handle;
mutex_lock(&slot_list_lock);
list_for_each_entry_safe(slot, tmp, &slot_list, list) {
if (slot->root_handle == handle) {
if (slot->pci_slot->bus == bus) {
list_del(&slot->list);
pbus = slot->pci_slot->bus;
pci_destroy_slot(slot->pci_slot);
put_device(&pbus->dev);
put_device(&bus->dev);
kfree(slot);
}
}
@ -332,5 +211,4 @@ static struct dmi_system_id acpi_pci_slot_dmi_table[] __initdata = {
void __init acpi_pci_slot_init(void)
{
dmi_check_system(acpi_pci_slot_dmi_table);
acpi_pci_register_driver(&acpi_pci_slot_driver);
}

1
drivers/acpi/scan.c
View file

@ -1790,7 +1790,6 @@ int __init acpi_scan_init(void)
acpi_platform_init();
acpi_csrt_init();
acpi_container_init();
acpi_pci_slot_init();
mutex_lock(&acpi_scan_lock);
/*

7
drivers/pci/pci-acpi.c
View file

@ -296,7 +296,7 @@ void acpi_pci_add_bus(struct pci_bus *bus)
if (acpi_pci_disabled || handle == NULL)
return;
/* TODO: add PCI slots and acpiphp hotplug slots */
acpi_pci_slot_enumerate(bus, handle);
}
void acpi_pci_remove_bus(struct pci_bus *bus)
@ -308,7 +308,7 @@ void acpi_pci_remove_bus(struct pci_bus *bus)
if (acpi_pci_disabled)
return;
/* TODO: remove PCI slots and acpiphp hotplug slots */
acpi_pci_slot_remove(bus);
}
/* ACPI bus type */
@ -385,7 +385,10 @@ static int __init acpi_pci_init(void)
ret = register_acpi_bus_type(&acpi_pci_bus);
if (ret)
return 0;
pci_set_platform_pm(&acpi_pci_platform_pm);
acpi_pci_slot_init();
return 0;
}
arch_initcall(acpi_pci_init);

12
include/linux/pci-acpi.h
View file

@ -44,6 +44,18 @@ static inline acpi_handle acpi_pci_get_bridge_handle(struct pci_bus *pbus)
void acpi_pci_add_bus(struct pci_bus *bus);
void acpi_pci_remove_bus(struct pci_bus *bus);
#ifdef CONFIG_ACPI_PCI_SLOT
void acpi_pci_slot_init(void);
void acpi_pci_slot_enumerate(struct pci_bus *bus, acpi_handle handle);
void acpi_pci_slot_remove(struct pci_bus *bus);
#else
static inline void acpi_pci_slot_init(void) { }
static inline void acpi_pci_slot_enumerate(struct pci_bus *bus,
acpi_handle handle) { }
static inline void acpi_pci_slot_remove(struct pci_bus *bus) { }
#endif
#else /* CONFIG_ACPI */
static inline void acpi_pci_add_bus(struct pci_bus *bus) { }
static inline void acpi_pci_remove_bus(struct pci_bus *bus) { }