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[ACPI] suspend/resume ACPI PCI Interrupt Links

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Add reference count and disable ACPI PCI Interrupt Link
when no device still uses it.

Warn when drivers have not released Link at suspend time.

http://bugzilla.kernel.org/show_bug.cgi?id=3469

Signed-off-by: David Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
David Shaohua Li 2005-07-27 23:02:00 -04:00 committed by Len Brown
parent 68ac767686
commit 87bec66b96
8 changed files with 157 additions and 47 deletions
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1
arch/i386/pci/acpi.c
View file

@ -30,6 +30,7 @@ static int __init pci_acpi_init(void)
acpi_irq_penalty_init();
pcibios_scanned++;
pcibios_enable_irq = acpi_pci_irq_enable;
pcibios_disable_irq = acpi_pci_irq_disable;
if (pci_routeirq) {
/*

6
arch/i386/pci/common.c
View file

@ -249,3 +249,9 @@ int pcibios_enable_device(struct pci_dev *dev, int mask)
return pcibios_enable_irq(dev);
}
void pcibios_disable_device (struct pci_dev *dev)
{
if (pcibios_disable_irq)
pcibios_disable_irq(dev);
}

1
arch/i386/pci/irq.c
View file

@ -56,6 +56,7 @@ struct irq_router_handler {
};
int (*pcibios_enable_irq)(struct pci_dev *dev) = NULL;
void (*pcibios_disable_irq)(struct pci_dev *dev) = NULL;
/*
* Search 0xf0000 -- 0xfffff for the PCI IRQ Routing Table.

1
arch/i386/pci/pci.h
View file

@ -72,3 +72,4 @@ extern int pcibios_scanned;
extern spinlock_t pci_config_lock;
extern int (*pcibios_enable_irq)(struct pci_dev *dev);
extern void (*pcibios_disable_irq)(struct pci_dev *dev);

85
drivers/acpi/pci_irq.c
View file

@ -269,7 +269,51 @@ acpi_pci_irq_del_prt (int segment, int bus)
/* --------------------------------------------------------------------------
PCI Interrupt Routing Support
-------------------------------------------------------------------------- */
typedef int (*irq_lookup_func)(struct acpi_prt_entry *, int *, int *, char **);
static int
acpi_pci_allocate_irq(struct acpi_prt_entry *entry,
int *edge_level,
int *active_high_low,
char **link)
{
int irq;
ACPI_FUNCTION_TRACE("acpi_pci_allocate_irq");
if (entry->link.handle) {
irq = acpi_pci_link_allocate_irq(entry->link.handle,
entry->link.index, edge_level, active_high_low, link);
if (irq < 0) {
ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ link routing entry\n"));
return_VALUE(-1);
}
} else {
irq = entry->link.index;
*edge_level = ACPI_LEVEL_SENSITIVE;
*active_high_low = ACPI_ACTIVE_LOW;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", irq));
return_VALUE(irq);
}
static int
acpi_pci_free_irq(struct acpi_prt_entry *entry,
int *edge_level,
int *active_high_low,
char **link)
{
int irq;
ACPI_FUNCTION_TRACE("acpi_pci_free_irq");
if (entry->link.handle) {
irq = acpi_pci_link_free_irq(entry->link.handle);
} else {
irq = entry->link.index;
}
return_VALUE(irq);
}
/*
* acpi_pci_irq_lookup
* success: return IRQ >= 0
@ -282,12 +326,13 @@ acpi_pci_irq_lookup (
int pin,
int *edge_level,
int *active_high_low,
char **link)
char **link,
irq_lookup_func func)
{
struct acpi_prt_entry *entry = NULL;
int segment = pci_domain_nr(bus);
int bus_nr = bus->number;
int irq;
int ret;
ACPI_FUNCTION_TRACE("acpi_pci_irq_lookup");
@ -301,22 +346,8 @@ acpi_pci_irq_lookup (
return_VALUE(-1);
}
if (entry->link.handle) {
irq = acpi_pci_link_get_irq(entry->link.handle,
entry->link.index, edge_level, active_high_low, link);
if (irq < 0) {
ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ link routing entry\n"));
return_VALUE(-1);
}
} else {
irq = entry->link.index;
*edge_level = ACPI_LEVEL_SENSITIVE;
*active_high_low = ACPI_ACTIVE_LOW;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", irq));
return_VALUE(irq);
ret = func(entry, edge_level, active_high_low, link);
return_VALUE(ret);
}
/*
@ -330,7 +361,8 @@ acpi_pci_irq_derive (
int pin,
int *edge_level,
int *active_high_low,
char **link)
char **link,
irq_lookup_func func)
{
struct pci_dev *bridge = dev;
int irq = -1;
@ -363,7 +395,7 @@ acpi_pci_irq_derive (
}
irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn),
pin, edge_level, active_high_low, link);
pin, edge_level, active_high_low, link, func);
}
if (irq < 0) {
@ -415,7 +447,7 @@ acpi_pci_irq_enable (
* values override any BIOS-assigned IRQs set during boot.
*/
irq = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
&edge_level, &active_high_low, &link);
&edge_level, &active_high_low, &link, acpi_pci_allocate_irq);
/*
* If no PRT entry was found, we'll try to derive an IRQ from the
@ -423,7 +455,7 @@ acpi_pci_irq_enable (
*/
if (irq < 0)
irq = acpi_pci_irq_derive(dev, pin, &edge_level,
&active_high_low, &link);
&active_high_low, &link, acpi_pci_allocate_irq);
/*
* No IRQ known to the ACPI subsystem - maybe the BIOS /
@ -461,7 +493,9 @@ acpi_pci_irq_enable (
EXPORT_SYMBOL(acpi_pci_irq_enable);
#ifdef CONFIG_ACPI_DEALLOCATE_IRQ
/* FIXME: implement x86/x86_64 version */
void __attribute__((weak)) acpi_unregister_gsi(u32 i) {}
void
acpi_pci_irq_disable (
struct pci_dev *dev)
@ -488,14 +522,14 @@ acpi_pci_irq_disable (
* First we check the PCI IRQ routing table (PRT) for an IRQ.
*/
gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
&edge_level, &active_high_low, NULL);
&edge_level, &active_high_low, NULL, acpi_pci_free_irq);
/*
* If no PRT entry was found, we'll try to derive an IRQ from the
* device's parent bridge.
*/
if (gsi < 0)
gsi = acpi_pci_irq_derive(dev, pin,
&edge_level, &active_high_low, NULL);
&edge_level, &active_high_low, NULL, acpi_pci_free_irq);
if (gsi < 0)
return_VOID;
@ -511,4 +545,3 @@ acpi_pci_irq_disable (
return_VOID;
}
#endif /* CONFIG_ACPI_DEALLOCATE_IRQ */

103
drivers/acpi/pci_link.c
View file

@ -68,6 +68,10 @@ static struct acpi_driver acpi_pci_link_driver = {
},
};
/*
* If a link is initialized, we never change its active and initialized
* later even the link is disable. Instead, we just repick the active irq
*/
struct acpi_pci_link_irq {
u8 active; /* Current IRQ */
u8 edge_level; /* All IRQs */
@ -76,8 +80,7 @@ struct acpi_pci_link_irq {
u8 possible_count;
u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
u8 initialized:1;
u8 suspend_resume:1;
u8 reserved:6;
u8 reserved:7;
};
struct acpi_pci_link {
@ -85,12 +88,14 @@ struct acpi_pci_link {
struct acpi_device *device;
acpi_handle handle;
struct acpi_pci_link_irq irq;
int refcnt;
};
static struct {
int count;
struct list_head entries;
} acpi_link;
DECLARE_MUTEX(acpi_link_lock);
/* --------------------------------------------------------------------------
@ -532,12 +537,12 @@ static int acpi_pci_link_allocate(
ACPI_FUNCTION_TRACE("acpi_pci_link_allocate");
if (link->irq.suspend_resume) {
acpi_pci_link_set(link, link->irq.active);
link->irq.suspend_resume = 0;
}
if (link->irq.initialized)
if (link->irq.initialized) {
if (link->refcnt == 0)
/* This means the link is disabled but initialized */
acpi_pci_link_set(link, link->irq.active);
return_VALUE(0);
}
/*
* search for active IRQ in list of possible IRQs.
@ -596,13 +601,13 @@ static int acpi_pci_link_allocate(
}
/*
* acpi_pci_link_get_irq
* acpi_pci_link_allocate_irq
* success: return IRQ >= 0
* failure: return -1
*/
int
acpi_pci_link_get_irq (
acpi_pci_link_allocate_irq (
acpi_handle handle,
int index,
int *edge_level,
@ -613,7 +618,7 @@ acpi_pci_link_get_irq (
struct acpi_device *device = NULL;
struct acpi_pci_link *link = NULL;
ACPI_FUNCTION_TRACE("acpi_pci_link_get_irq");
ACPI_FUNCTION_TRACE("acpi_pci_link_allocate_irq");
result = acpi_bus_get_device(handle, &device);
if (result) {
@ -633,21 +638,70 @@ acpi_pci_link_get_irq (
return_VALUE(-1);
}
if (acpi_pci_link_allocate(link))
down(&acpi_link_lock);
if (acpi_pci_link_allocate(link)) {
up(&acpi_link_lock);
return_VALUE(-1);
}
if (!link->irq.active) {
up(&acpi_link_lock);
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link active IRQ is 0!\n"));
return_VALUE(-1);
}
link->refcnt ++;
up(&acpi_link_lock);
if (edge_level) *edge_level = link->irq.edge_level;
if (active_high_low) *active_high_low = link->irq.active_high_low;
if (name) *name = acpi_device_bid(link->device);
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Link %s is referenced\n", acpi_device_bid(link->device)));
return_VALUE(link->irq.active);
}
/*
* We don't change link's irq information here. After it is reenabled, we
* continue use the info
*/
int
acpi_pci_link_free_irq(acpi_handle handle)
{
struct acpi_device *device = NULL;
struct acpi_pci_link *link = NULL;
acpi_status result;
ACPI_FUNCTION_TRACE("acpi_pci_link_free_irq");
result = acpi_bus_get_device(handle, &device);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n"));
return_VALUE(-1);
}
link = (struct acpi_pci_link *) acpi_driver_data(device);
if (!link) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
return_VALUE(-1);
}
down(&acpi_link_lock);
if (!link->irq.initialized) {
up(&acpi_link_lock);
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link isn't initialized\n"));
return_VALUE(-1);
}
link->refcnt --;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Link %s is dereferenced\n", acpi_device_bid(link->device)));
if (link->refcnt == 0) {
acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL);
}
up(&acpi_link_lock);
return_VALUE(link->irq.active);
}
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
@ -677,6 +731,7 @@ acpi_pci_link_add (
strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
acpi_driver_data(device) = link;
down(&acpi_link_lock);
result = acpi_pci_link_get_possible(link);
if (result)
goto end;
@ -712,6 +767,7 @@ acpi_pci_link_add (
end:
/* disable all links -- to be activated on use */
acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL);
up(&acpi_link_lock);
if (result)
kfree(link);
@ -726,19 +782,32 @@ irqrouter_suspend(
{
struct list_head *node = NULL;
struct acpi_pci_link *link = NULL;
int ret = 0;
ACPI_FUNCTION_TRACE("irqrouter_suspend");
list_for_each(node, &acpi_link.entries) {
link = list_entry(node, struct acpi_pci_link, node);
if (!link) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Invalid link context\n"));
continue;
}
if (link->irq.active && link->irq.initialized)
link->irq.suspend_resume = 1;
if (link->irq.initialized && link->refcnt != 0
/* We ignore legacy IDE device irq */
&& link->irq.active != 14 && link->irq.active !=15) {
printk(KERN_WARNING PREFIX
"%d drivers with interrupt %d neglected to call"
" pci_disable_device at .suspend\n",
link->refcnt,
link->irq.active);
printk(KERN_WARNING PREFIX
"Fix the driver, or rmmod before suspend\n");
link->refcnt = 0;
ret = -EINVAL;
}
}
return_VALUE(0);
return_VALUE(ret);
}
@ -756,8 +825,9 @@ acpi_pci_link_remove (
link = (struct acpi_pci_link *) acpi_driver_data(device);
/* TBD: Acquire/release lock */
down(&acpi_link_lock);
list_del(&link->node);
up(&acpi_link_lock);
kfree(link);
@ -849,6 +919,7 @@ int __init acpi_irq_balance_set(char *str)
__setup("acpi_irq_balance", acpi_irq_balance_set);
/* FIXME: we will remove this interface after all drivers call pci_disable_device */
static struct sysdev_class irqrouter_sysdev_class = {
set_kset_name("irqrouter"),
.suspend = irqrouter_suspend,

3
include/acpi/acpi_drivers.h
View file

@ -56,8 +56,9 @@
/* ACPI PCI Interrupt Link (pci_link.c) */
int acpi_irq_penalty_init (void);
int acpi_pci_link_get_irq (acpi_handle handle, int index, int *edge_level,
int acpi_pci_link_allocate_irq (acpi_handle handle, int index, int *edge_level,
int *active_high_low, char **name);
int acpi_pci_link_free_irq(acpi_handle handle);
/* ACPI PCI Interrupt Routing (pci_irq.c) */

4
include/linux/acpi.h
View file

@ -440,9 +440,7 @@ int acpi_gsi_to_irq (u32 gsi, unsigned int *irq);
* If this matches the last registration, any IRQ resources for gsi
* are freed.
*/
#ifdef CONFIG_ACPI_DEALLOCATE_IRQ
void acpi_unregister_gsi (u32 gsi);
#endif
#ifdef CONFIG_ACPI_PCI
@ -467,9 +465,7 @@ struct pci_dev;
int acpi_pci_irq_enable (struct pci_dev *dev);
void acpi_penalize_isa_irq(int irq, int active);
#ifdef CONFIG_ACPI_DEALLOCATE_IRQ
void acpi_pci_irq_disable (struct pci_dev *dev);
#endif
struct acpi_pci_driver {
struct acpi_pci_driver *next;