q3k/linux
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
linux/drivers/acpi/pci_link.c
Dave Jones a64882e795 [PATCH] ACPI: fix sleeping whilst atomic warnings on resume 
This has been broken for months.  On resume, we call acpi_pci_link_set()
with interrupts off, so we get a warning when we try to do a kmalloc of non
atomic memory.  The actual allocation is just 2 long's (plus extra byte for
some reason I can't fathom), so a simple conversion to GFP_ATOMIC is
probably the safest way to fix this.

The error looks like this..

Debug: sleeping function called from invalid context at mm/slab.c:2486
in_atomic():0, irqs_disabled():1
 [<c0143f6c>] kmem_cache_alloc+0x40/0x56
 [<c0206a2e>] acpi_pci_link_set+0x3f/0x17f
 [<c0206f96>] irqrouter_resume+0x1e/0x3c
 [<c0239bca>] __sysdev_resume+0x11/0x6b
 [<c0239e88>] sysdev_resume+0x34/0x52
 [<c023de21>] device_power_up+0x5/0xa

Signed-off-by: Dave Jones <davej@redhat.com>
Cc: "Brown, Len" <len.brown@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-12-12 08:57:45 -08:00

980 lines
25 KiB
C
Raw Blame History

/*
* pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $)
*
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
* Copyright (C) 2002 Dominik Brodowski <devel@brodo.de>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* TBD:
* 1. Support more than one IRQ resource entry per link device (index).
* 2. Implement start/stop mechanism and use ACPI Bus Driver facilities
* for IRQ management (e.g. start()->_SRS).
*/
#include <linux/sysdev.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/pm.h>
#include <linux/pci.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#define _COMPONENT ACPI_PCI_COMPONENT
ACPI_MODULE_NAME("pci_link")
#define ACPI_PCI_LINK_CLASS "pci_irq_routing"
#define ACPI_PCI_LINK_HID "PNP0C0F"
#define ACPI_PCI_LINK_DRIVER_NAME "ACPI PCI Interrupt Link Driver"
#define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link"
#define ACPI_PCI_LINK_FILE_INFO "info"
#define ACPI_PCI_LINK_FILE_STATUS "state"
#define ACPI_PCI_LINK_MAX_POSSIBLE 16
static int acpi_pci_link_add(struct acpi_device *device);
static int acpi_pci_link_remove(struct acpi_device *device, int type);
static struct acpi_driver acpi_pci_link_driver = {
.name = ACPI_PCI_LINK_DRIVER_NAME,
.class = ACPI_PCI_LINK_CLASS,
.ids = ACPI_PCI_LINK_HID,
.ops = {
.add = acpi_pci_link_add,
.remove = acpi_pci_link_remove,
},
};
/*
* 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 */
u8 active_high_low; /* All IRQs */
u8 resource_type;
u8 possible_count;
u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
u8 initialized:1;
u8 reserved:7;
};
struct acpi_pci_link {
struct list_head node;
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);
/* --------------------------------------------------------------------------
PCI Link Device Management
-------------------------------------------------------------------------- */
/*
* set context (link) possible list from resource list
*/
static acpi_status
acpi_pci_link_check_possible(struct acpi_resource *resource, void *context)
{
struct acpi_pci_link *link = (struct acpi_pci_link *)context;
u32 i = 0;
ACPI_FUNCTION_TRACE("acpi_pci_link_check_possible");
switch (resource->id) {
case ACPI_RSTYPE_START_DPF:
return_ACPI_STATUS(AE_OK);
case ACPI_RSTYPE_IRQ:
{
struct acpi_resource_irq *p = &resource->data.irq;
if (!p || !p->number_of_interrupts) {
ACPI_DEBUG_PRINT((ACPI_DB_WARN,
"Blank IRQ resource\n"));
return_ACPI_STATUS(AE_OK);
}
for (i = 0;
(i < p->number_of_interrupts
&& i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
if (!p->interrupts[i]) {
ACPI_DEBUG_PRINT((ACPI_DB_WARN,
"Invalid IRQ %d\n",
p->interrupts[i]));
continue;
}
link->irq.possible[i] = p->interrupts[i];
link->irq.possible_count++;
}
link->irq.edge_level = p->edge_level;
link->irq.active_high_low = p->active_high_low;
link->irq.resource_type = ACPI_RSTYPE_IRQ;
break;
}
case ACPI_RSTYPE_EXT_IRQ:
{
struct acpi_resource_ext_irq *p =
&resource->data.extended_irq;
if (!p || !p->number_of_interrupts) {
ACPI_DEBUG_PRINT((ACPI_DB_WARN,
"Blank EXT IRQ resource\n"));
return_ACPI_STATUS(AE_OK);
}
for (i = 0;
(i < p->number_of_interrupts
&& i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
if (!p->interrupts[i]) {
ACPI_DEBUG_PRINT((ACPI_DB_WARN,
"Invalid IRQ %d\n",
p->interrupts[i]));
continue;
}
link->irq.possible[i] = p->interrupts[i];
link->irq.possible_count++;
}
link->irq.edge_level = p->edge_level;
link->irq.active_high_low = p->active_high_low;
link->irq.resource_type = ACPI_RSTYPE_EXT_IRQ;
break;
}
default:
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Resource is not an IRQ entry\n"));
return_ACPI_STATUS(AE_OK);
}
return_ACPI_STATUS(AE_CTRL_TERMINATE);
}
static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
{
acpi_status status;
ACPI_FUNCTION_TRACE("acpi_pci_link_get_possible");
if (!link)
return_VALUE(-EINVAL);
status = acpi_walk_resources(link->handle, METHOD_NAME__PRS,
acpi_pci_link_check_possible, link);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRS\n"));
return_VALUE(-ENODEV);
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Found %d possible IRQs\n",
link->irq.possible_count));
return_VALUE(0);
}
static acpi_status
acpi_pci_link_check_current(struct acpi_resource *resource, void *context)
{
int *irq = (int *)context;
ACPI_FUNCTION_TRACE("acpi_pci_link_check_current");
switch (resource->id) {
case ACPI_RSTYPE_IRQ:
{
struct acpi_resource_irq *p = &resource->data.irq;
if (!p || !p->number_of_interrupts) {
/*
* IRQ descriptors may have no IRQ# bits set,
* particularly those those w/ _STA disabled
*/
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Blank IRQ resource\n"));
return_ACPI_STATUS(AE_OK);
}
*irq = p->interrupts[0];
break;
}
case ACPI_RSTYPE_EXT_IRQ:
{
struct acpi_resource_ext_irq *p =
&resource->data.extended_irq;
if (!p || !p->number_of_interrupts) {
/*
* extended IRQ descriptors must
* return at least 1 IRQ
*/
ACPI_DEBUG_PRINT((ACPI_DB_WARN,
"Blank EXT IRQ resource\n"));
return_ACPI_STATUS(AE_OK);
}
*irq = p->interrupts[0];
break;
}
default:
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Resource isn't an IRQ\n"));
return_ACPI_STATUS(AE_OK);
}
return_ACPI_STATUS(AE_CTRL_TERMINATE);
}
/*
* Run _CRS and set link->irq.active
*
* return value:
* 0 - success
* !0 - failure
*/
static int acpi_pci_link_get_current(struct acpi_pci_link *link)
{
int result = 0;
acpi_status status = AE_OK;
int irq = 0;
ACPI_FUNCTION_TRACE("acpi_pci_link_get_current");
if (!link || !link->handle)
return_VALUE(-EINVAL);
link->irq.active = 0;
/* in practice, status disabled is meaningless, ignore it */
if (acpi_strict) {
/* Query _STA, set link->device->status */
result = acpi_bus_get_status(link->device);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unable to read status\n"));
goto end;
}
if (!link->device->status.enabled) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
return_VALUE(0);
}
}
/*
* Query and parse _CRS to get the current IRQ assignment.
*/
status = acpi_walk_resources(link->handle, METHOD_NAME__CRS,
acpi_pci_link_check_current, &irq);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _CRS\n"));
result = -ENODEV;
goto end;
}
if (acpi_strict && !irq) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "_CRS returned 0\n"));
result = -ENODEV;
}
link->irq.active = irq;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
end:
return_VALUE(result);
}
static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
{
int result = 0;
acpi_status status = AE_OK;
struct {
struct acpi_resource res;
struct acpi_resource end;
} *resource;
struct acpi_buffer buffer = { 0, NULL };
ACPI_FUNCTION_TRACE("acpi_pci_link_set");
if (!link || !irq)
return_VALUE(-EINVAL);
resource = kmalloc(sizeof(*resource) + 1, GFP_ATOMIC);
if (!resource)
return_VALUE(-ENOMEM);
memset(resource, 0, sizeof(*resource) + 1);
buffer.length = sizeof(*resource) + 1;
buffer.pointer = resource;
switch (link->irq.resource_type) {
case ACPI_RSTYPE_IRQ:
resource->res.id = ACPI_RSTYPE_IRQ;
resource->res.length = sizeof(struct acpi_resource);
resource->res.data.irq.edge_level = link->irq.edge_level;
resource->res.data.irq.active_high_low =
link->irq.active_high_low;
if (link->irq.edge_level == ACPI_EDGE_SENSITIVE)
resource->res.data.irq.shared_exclusive =
ACPI_EXCLUSIVE;
else
resource->res.data.irq.shared_exclusive = ACPI_SHARED;
resource->res.data.irq.number_of_interrupts = 1;
resource->res.data.irq.interrupts[0] = irq;
break;
case ACPI_RSTYPE_EXT_IRQ:
resource->res.id = ACPI_RSTYPE_EXT_IRQ;
resource->res.length = sizeof(struct acpi_resource);
resource->res.data.extended_irq.producer_consumer =
ACPI_CONSUMER;
resource->res.data.extended_irq.edge_level =
link->irq.edge_level;
resource->res.data.extended_irq.active_high_low =
link->irq.active_high_low;
if (link->irq.edge_level == ACPI_EDGE_SENSITIVE)
resource->res.data.irq.shared_exclusive =
ACPI_EXCLUSIVE;
else
resource->res.data.irq.shared_exclusive = ACPI_SHARED;
resource->res.data.extended_irq.number_of_interrupts = 1;
resource->res.data.extended_irq.interrupts[0] = irq;
/* ignore resource_source, it's optional */
break;
default:
printk("ACPI BUG: resource_type %d\n", link->irq.resource_type);
result = -EINVAL;
goto end;
}
resource->end.id = ACPI_RSTYPE_END_TAG;
/* Attempt to set the resource */
status = acpi_set_current_resources(link->handle, &buffer);
/* check for total failure */
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SRS\n"));
result = -ENODEV;
goto end;
}
/* Query _STA, set device->status */
result = acpi_bus_get_status(link->device);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to read status\n"));
goto end;
}
if (!link->device->status.enabled) {
printk(KERN_WARNING PREFIX
"%s [%s] disabled and referenced, BIOS bug.\n",
acpi_device_name(link->device),
acpi_device_bid(link->device));
}
/* Query _CRS, set link->irq.active */
result = acpi_pci_link_get_current(link);
if (result) {
goto end;
}
/*
* Is current setting not what we set?
* set link->irq.active
*/
if (link->irq.active != irq) {
/*
* policy: when _CRS doesn't return what we just _SRS
* assume _SRS worked and override _CRS value.
*/
printk(KERN_WARNING PREFIX
"%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
acpi_device_name(link->device),
acpi_device_bid(link->device), link->irq.active, irq);
link->irq.active = irq;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
end:
kfree(resource);
return_VALUE(result);
}
/* --------------------------------------------------------------------------
PCI Link IRQ Management
-------------------------------------------------------------------------- */
/*
* "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
* Link Devices to move the PIRQs around to minimize sharing.
*
* "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
* that the BIOS has already set to active. This is necessary because
* ACPI has no automatic means of knowing what ISA IRQs are used. Note that
* if the BIOS doesn't set a Link Device active, ACPI needs to program it
* even if acpi_irq_nobalance is set.
*
* A tables of penalties avoids directing PCI interrupts to well known
* ISA IRQs. Boot params are available to over-ride the default table:
*
* List interrupts that are free for PCI use.
* acpi_irq_pci=n[,m]
*
* List interrupts that should not be used for PCI:
* acpi_irq_isa=n[,m]
*
* Note that PCI IRQ routers have a list of possible IRQs,
* which may not include the IRQs this table says are available.
*
* Since this heuristic can't tell the difference between a link
* that no device will attach to, vs. a link which may be shared
* by multiple active devices -- it is not optimal.
*
* If interrupt performance is that important, get an IO-APIC system
* with a pin dedicated to each device. Or for that matter, an MSI
* enabled system.
*/
#define ACPI_MAX_IRQS 256
#define ACPI_MAX_ISA_IRQ 16
#define PIRQ_PENALTY_PCI_AVAILABLE (0)
#define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
#define PIRQ_PENALTY_PCI_USING (16*16*16)
#define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
#define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
#define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */
PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */
PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */
PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */
PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */
PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */
PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */
PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */
PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */
PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */
/* >IRQ15 */
};
int __init acpi_irq_penalty_init(void)
{
struct list_head *node = NULL;
struct acpi_pci_link *link = NULL;
int i = 0;
ACPI_FUNCTION_TRACE("acpi_irq_penalty_init");
/*
* Update penalties to facilitate IRQ balancing.
*/
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"));
continue;
}
/*
* reflect the possible and active irqs in the penalty table --
* useful for breaking ties.
*/
if (link->irq.possible_count) {
int penalty =
PIRQ_PENALTY_PCI_POSSIBLE /
link->irq.possible_count;
for (i = 0; i < link->irq.possible_count; i++) {
if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
acpi_irq_penalty[link->irq.
possible[i]] +=
penalty;
}
} else if (link->irq.active) {
acpi_irq_penalty[link->irq.active] +=
PIRQ_PENALTY_PCI_POSSIBLE;
}
}
/* Add a penalty for the SCI */
acpi_irq_penalty[acpi_fadt.sci_int] += PIRQ_PENALTY_PCI_USING;
return_VALUE(0);
}
static int acpi_irq_balance; /* 0: static, 1: balance */
static int acpi_pci_link_allocate(struct acpi_pci_link *link)
{
int irq;
int i;
ACPI_FUNCTION_TRACE("acpi_pci_link_allocate");
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.
*/
for (i = 0; i < link->irq.possible_count; ++i) {
if (link->irq.active == link->irq.possible[i])
break;
}
/*
* forget active IRQ that is not in possible list
*/
if (i == link->irq.possible_count) {
if (acpi_strict)
printk(KERN_WARNING PREFIX "_CRS %d not found"
" in _PRS\n", link->irq.active);
link->irq.active = 0;
}
/*
* if active found, use it; else pick entry from end of possible list.
*/
if (link->irq.active) {
irq = link->irq.active;
} else {
irq = link->irq.possible[link->irq.possible_count - 1];
}
if (acpi_irq_balance || !link->irq.active) {
/*
* Select the best IRQ. This is done in reverse to promote
* the use of IRQs 9, 10, 11, and >15.
*/
for (i = (link->irq.possible_count - 1); i >= 0; i--) {
if (acpi_irq_penalty[irq] >
acpi_irq_penalty[link->irq.possible[i]])
irq = link->irq.possible[i];
}
}
/* Attempt to enable the link device at this IRQ. */
if (acpi_pci_link_set(link, irq)) {
printk(PREFIX
"Unable to set IRQ for %s [%s] (likely buggy ACPI BIOS).\n"
"Try pci=noacpi or acpi=off\n",
acpi_device_name(link->device),
acpi_device_bid(link->device));
return_VALUE(-ENODEV);
} else {
acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
printk(PREFIX "%s [%s] enabled at IRQ %d\n",
acpi_device_name(link->device),
acpi_device_bid(link->device), link->irq.active);
}
link->irq.initialized = 1;
return_VALUE(0);
}
/*
* acpi_pci_link_allocate_irq
* success: return IRQ >= 0
* failure: return -1
*/
int
acpi_pci_link_allocate_irq(acpi_handle handle,
int index,
int *edge_level, int *active_high_low, char **name)
{
int result = 0;
struct acpi_device *device = NULL;
struct acpi_pci_link *link = NULL;
ACPI_FUNCTION_TRACE("acpi_pci_link_allocate_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);
}
/* TBD: Support multiple index (IRQ) entries per Link Device */
if (index) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid index %d\n", index));
return_VALUE(-1);
}
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);
}
#ifdef FUTURE_USE
/*
* The Link reference count allows us to _DISable an unused link
* and suspend time, and set it again on resume.
* However, 2.6.12 still has irq_router.resume
* which blindly restores the link state.
* So we disable the reference count method
* to prevent duplicate acpi_pci_link_set()
* which would harm some systems
*/
link->refcnt--;
#endif
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
-------------------------------------------------------------------------- */
static int acpi_pci_link_add(struct acpi_device *device)
{
int result = 0;
struct acpi_pci_link *link = NULL;
int i = 0;
int found = 0;
ACPI_FUNCTION_TRACE("acpi_pci_link_add");
if (!device)
return_VALUE(-EINVAL);
link = kmalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
if (!link)
return_VALUE(-ENOMEM);
memset(link, 0, sizeof(struct acpi_pci_link));
link->device = device;
link->handle = device->handle;
strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
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;
/* query and set link->irq.active */
acpi_pci_link_get_current(link);
printk(PREFIX "%s [%s] (IRQs", acpi_device_name(device),
acpi_device_bid(device));
for (i = 0; i < link->irq.possible_count; i++) {
if (link->irq.active == link->irq.possible[i]) {
printk(" *%d", link->irq.possible[i]);
found = 1;
} else
printk(" %d", link->irq.possible[i]);
}
printk(")");
if (!found)
printk(" *%d", link->irq.active);
if (!link->device->status.enabled)
printk(", disabled.");
printk("\n");
/* TBD: Acquire/release lock */
list_add_tail(&link->node, &acpi_link.entries);
acpi_link.count++;
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);
return_VALUE(result);
}
static int acpi_pci_link_resume(struct acpi_pci_link *link)
{
ACPI_FUNCTION_TRACE("acpi_pci_link_resume");
if (link->refcnt && link->irq.active && link->irq.initialized)
return_VALUE(acpi_pci_link_set(link, link->irq.active));
else
return_VALUE(0);
}
/*
* FIXME: this is a workaround to avoid nasty warning. It will be removed
* after every device calls pci_disable_device in .resume.
*/
int acpi_in_resume;
static int irqrouter_resume(struct sys_device *dev)
{
struct list_head *node = NULL;
struct acpi_pci_link *link = NULL;
ACPI_FUNCTION_TRACE("irqrouter_resume");
acpi_in_resume = 1;
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"));
continue;
}
acpi_pci_link_resume(link);
}
acpi_in_resume = 0;
return_VALUE(0);
}
static int acpi_pci_link_remove(struct acpi_device *device, int type)
{
struct acpi_pci_link *link = NULL;
ACPI_FUNCTION_TRACE("acpi_pci_link_remove");
if (!device || !acpi_driver_data(device))
return_VALUE(-EINVAL);
link = (struct acpi_pci_link *)acpi_driver_data(device);
down(&acpi_link_lock);
list_del(&link->node);
up(&acpi_link_lock);
kfree(link);
return_VALUE(0);
}
/*
* modify acpi_irq_penalty[] from cmdline
*/
static int __init acpi_irq_penalty_update(char *str, int used)
{
int i;
for (i = 0; i < 16; i++) {
int retval;
int irq;
retval = get_option(&str, &irq);
if (!retval)
break; /* no number found */
if (irq < 0)
continue;
if (irq >= ACPI_MAX_IRQS)
continue;
if (used)
acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
else
acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
if (retval != 2) /* no next number */
break;
}
return 1;
}
/*
* We'd like PNP to call this routine for the
* single ISA_USED value for each legacy device.
* But instead it calls us with each POSSIBLE setting.
* There is no ISA_POSSIBLE weight, so we simply use
* the (small) PCI_USING penalty.
*/
void acpi_penalize_isa_irq(int irq, int active)
{
if (active)
acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
else
acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
}
/*
* Over-ride default table to reserve additional IRQs for use by ISA
* e.g. acpi_irq_isa=5
* Useful for telling ACPI how not to interfere with your ISA sound card.
*/
static int __init acpi_irq_isa(char *str)
{
return acpi_irq_penalty_update(str, 1);
}
__setup("acpi_irq_isa=", acpi_irq_isa);
/*
* Over-ride default table to free additional IRQs for use by PCI
* e.g. acpi_irq_pci=7,15
* Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
*/
static int __init acpi_irq_pci(char *str)
{
return acpi_irq_penalty_update(str, 0);
}
__setup("acpi_irq_pci=", acpi_irq_pci);
static int __init acpi_irq_nobalance_set(char *str)
{
acpi_irq_balance = 0;
return 1;
}
__setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
int __init acpi_irq_balance_set(char *str)
{
acpi_irq_balance = 1;
return 1;
}
__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"),
.resume = irqrouter_resume,
};
static struct sys_device device_irqrouter = {
.id = 0,
.cls = &irqrouter_sysdev_class,
};
static int __init irqrouter_init_sysfs(void)
{
int error;
ACPI_FUNCTION_TRACE("irqrouter_init_sysfs");
if (acpi_disabled || acpi_noirq)
return_VALUE(0);
error = sysdev_class_register(&irqrouter_sysdev_class);
if (!error)
error = sysdev_register(&device_irqrouter);
return_VALUE(error);
}
device_initcall(irqrouter_init_sysfs);
static int __init acpi_pci_link_init(void)
{
ACPI_FUNCTION_TRACE("acpi_pci_link_init");
if (acpi_noirq)
return_VALUE(0);
acpi_link.count = 0;
INIT_LIST_HEAD(&acpi_link.entries);
if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
return_VALUE(-ENODEV);
return_VALUE(0);
}
subsys_initcall(acpi_pci_link_init);
Reference in a new issue View git blame Copy permalink