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remarkable-linux/drivers/acpi/pci_link.c
Sinan Kaya f7eca374f0 ACPI,PCI,IRQ: separate ISA penalty calculation 
Since commit 103544d869 (ACPI,PCI,IRQ: reduce resource requirements)
the penalty values are calculated on the fly rather than at boot time.

This works fine for PCI interrupts but not so well for ISA interrupts.

The information on whether or not an ISA interrupt is in use is not
available to the pci_link.c code directly.  That information is
obtained from the outside via acpi_penalize_isa_irq().  [If its
"active" argument is true, then the IRQ is in use by ISA.]

Since the current code relies on PCI Link objects for determination
of penalties, we are factoring in the PCI penalty twice after
acpi_penalize_isa_irq() function is called.

To avoid that, limit the newly added functionality to just PCI
interrupts so that old behavior is still maintained.

Fixes: 103544d869 (ACPI,PCI,IRQ: reduce resource requirements)
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Tested-by: Wim Osterholt <wim@djo.tudelft.nl>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-07-02 01:38:34 +02:00

943 lines
24 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.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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/syscore_ops.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/pm.h>
#include <linux/pci.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/irq.h>
#include "internal.h"
#define _COMPONENT ACPI_PCI_COMPONENT
ACPI_MODULE_NAME("pci_link");
#define ACPI_PCI_LINK_CLASS "pci_irq_routing"
#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,
const struct acpi_device_id *not_used);
static void acpi_pci_link_remove(struct acpi_device *device);
static const struct acpi_device_id link_device_ids[] = {
{"PNP0C0F", 0},
{"", 0},
};
static struct acpi_scan_handler pci_link_handler = {
.ids = link_device_ids,
.attach = acpi_pci_link_add,
.detach = 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 {
u32 active; /* Current IRQ */
u8 triggering; /* All IRQs */
u8 polarity; /* All IRQs */
u8 resource_type;
u8 possible_count;
u32 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
u8 initialized:1;
u8 reserved:7;
};
struct acpi_pci_link {
struct list_head list;
struct acpi_device *device;
struct acpi_pci_link_irq irq;
int refcnt;
};
static LIST_HEAD(acpi_link_list);
static DEFINE_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 = context;
u32 i;
switch (resource->type) {
case ACPI_RESOURCE_TYPE_START_DEPENDENT:
case ACPI_RESOURCE_TYPE_END_TAG:
return AE_OK;
case ACPI_RESOURCE_TYPE_IRQ:
{
struct acpi_resource_irq *p = &resource->data.irq;
if (!p || !p->interrupt_count) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Blank _PRS IRQ resource\n"));
return AE_OK;
}
for (i = 0;
(i < p->interrupt_count
&& i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
if (!p->interrupts[i]) {
printk(KERN_WARNING PREFIX
"Invalid _PRS IRQ %d\n",
p->interrupts[i]);
continue;
}
link->irq.possible[i] = p->interrupts[i];
link->irq.possible_count++;
}
link->irq.triggering = p->triggering;
link->irq.polarity = p->polarity;
link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;
break;
}
case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
{
struct acpi_resource_extended_irq *p =
&resource->data.extended_irq;
if (!p || !p->interrupt_count) {
printk(KERN_WARNING PREFIX
"Blank _PRS EXT IRQ resource\n");
return AE_OK;
}
for (i = 0;
(i < p->interrupt_count
&& i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
if (!p->interrupts[i]) {
printk(KERN_WARNING PREFIX
"Invalid _PRS IRQ %d\n",
p->interrupts[i]);
continue;
}
link->irq.possible[i] = p->interrupts[i];
link->irq.possible_count++;
}
link->irq.triggering = p->triggering;
link->irq.polarity = p->polarity;
link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
break;
}
default:
printk(KERN_ERR PREFIX "_PRS resource type 0x%x isn't an IRQ\n",
resource->type);
return AE_OK;
}
return AE_CTRL_TERMINATE;
}
static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
{
acpi_status status;
status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS,
acpi_pci_link_check_possible, link);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS"));
return -ENODEV;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Found %d possible IRQs\n",
link->irq.possible_count));
return 0;
}
static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource,
void *context)
{
int *irq = context;
switch (resource->type) {
case ACPI_RESOURCE_TYPE_START_DEPENDENT:
case ACPI_RESOURCE_TYPE_END_TAG:
return AE_OK;
case ACPI_RESOURCE_TYPE_IRQ:
{
struct acpi_resource_irq *p = &resource->data.irq;
if (!p || !p->interrupt_count) {
/*
* IRQ descriptors may have no IRQ# bits set,
* particularly those those w/ _STA disabled
*/
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Blank _CRS IRQ resource\n"));
return AE_OK;
}
*irq = p->interrupts[0];
break;
}
case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
{
struct acpi_resource_extended_irq *p =
&resource->data.extended_irq;
if (!p || !p->interrupt_count) {
/*
* extended IRQ descriptors must
* return at least 1 IRQ
*/
printk(KERN_WARNING PREFIX
"Blank _CRS EXT IRQ resource\n");
return AE_OK;
}
*irq = p->interrupts[0];
break;
}
break;
default:
printk(KERN_ERR PREFIX "_CRS resource type 0x%x isn't an IRQ\n",
resource->type);
return AE_OK;
}
return 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;
int irq = 0;
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) {
printk(KERN_ERR PREFIX "Unable to read status\n");
goto end;
}
if (!link->device->status.enabled) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
return 0;
}
}
/*
* Query and parse _CRS to get the current IRQ assignment.
*/
status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS,
acpi_pci_link_check_current, &irq);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS"));
result = -ENODEV;
goto end;
}
if (acpi_strict && !irq) {
printk(KERN_ERR PREFIX "_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 result;
}
static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
{
int result;
acpi_status status;
struct {
struct acpi_resource res;
struct acpi_resource end;
} *resource;
struct acpi_buffer buffer = { 0, NULL };
if (!irq)
return -EINVAL;
resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
if (!resource)
return -ENOMEM;
buffer.length = sizeof(*resource) + 1;
buffer.pointer = resource;
switch (link->irq.resource_type) {
case ACPI_RESOURCE_TYPE_IRQ:
resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
resource->res.length = sizeof(struct acpi_resource);
resource->res.data.irq.triggering = link->irq.triggering;
resource->res.data.irq.polarity =
link->irq.polarity;
if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
resource->res.data.irq.sharable =
ACPI_EXCLUSIVE;
else
resource->res.data.irq.sharable = ACPI_SHARED;
resource->res.data.irq.interrupt_count = 1;
resource->res.data.irq.interrupts[0] = irq;
break;
case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
resource->res.length = sizeof(struct acpi_resource);
resource->res.data.extended_irq.producer_consumer =
ACPI_CONSUMER;
resource->res.data.extended_irq.triggering =
link->irq.triggering;
resource->res.data.extended_irq.polarity =
link->irq.polarity;
if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
resource->res.data.irq.sharable =
ACPI_EXCLUSIVE;
else
resource->res.data.irq.sharable = ACPI_SHARED;
resource->res.data.extended_irq.interrupt_count = 1;
resource->res.data.extended_irq.interrupts[0] = irq;
/* ignore resource_source, it's optional */
break;
default:
printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type);
result = -EINVAL;
goto end;
}
resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;
resource->end.length = sizeof(struct acpi_resource);
/* Attempt to set the resource */
status = acpi_set_current_resources(link->device->handle, &buffer);
/* check for total failure */
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS"));
result = -ENODEV;
goto end;
}
/* Query _STA, set device->status */
result = acpi_bus_get_status(link->device);
if (result) {
printk(KERN_ERR PREFIX "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 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_ISA_IRQS 16
#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_isa_irq_penalty[ACPI_MAX_ISA_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 */
0, /* IRQ9 PCI, often acpi */
0, /* IRQ10 PCI */
0, /* 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 */
};
static int acpi_irq_pci_sharing_penalty(int irq)
{
struct acpi_pci_link *link;
int penalty = 0;
int i;
list_for_each_entry(link, &acpi_link_list, list) {
/*
* If a link is active, penalize its IRQ heavily
* so we try to choose a different IRQ.
*/
if (link->irq.active && link->irq.active == irq)
penalty += PIRQ_PENALTY_PCI_USING;
/*
* penalize the IRQs PCI might use, but not as severely.
*/
for (i = 0; i < link->irq.possible_count; i++)
if (link->irq.possible[i] == irq)
penalty += PIRQ_PENALTY_PCI_POSSIBLE /
link->irq.possible_count;
}
return penalty;
}
static int acpi_irq_get_penalty(int irq)
{
int penalty = 0;
/*
* Penalize IRQ used by ACPI SCI. If ACPI SCI pin attributes conflict
* with PCI IRQ attributes, mark ACPI SCI as ISA_ALWAYS so it won't be
* use for PCI IRQs.
*/
if (irq == acpi_gbl_FADT.sci_interrupt) {
u32 type = irq_get_trigger_type(irq) & IRQ_TYPE_SENSE_MASK;
if (type != IRQ_TYPE_LEVEL_LOW)
penalty += PIRQ_PENALTY_ISA_ALWAYS;
else
penalty += PIRQ_PENALTY_PCI_USING;
}
if (irq < ACPI_MAX_ISA_IRQS)
return penalty + acpi_isa_irq_penalty[irq];
penalty += acpi_irq_pci_sharing_penalty(irq);
return penalty;
}
int __init acpi_irq_penalty_init(void)
{
struct acpi_pci_link *link;
int i;
/*
* Update penalties to facilitate IRQ balancing.
*/
list_for_each_entry(link, &acpi_link_list, list) {
/*
* 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_IRQS)
acpi_isa_irq_penalty[link->irq.
possible[i]] +=
penalty;
}
} else if (link->irq.active &&
(link->irq.active < ACPI_MAX_ISA_IRQS)) {
acpi_isa_irq_penalty[link->irq.active] +=
PIRQ_PENALTY_PCI_POSSIBLE;
}
}
return 0;
}
static int acpi_irq_balance = -1; /* 0: static, 1: balance */
static int acpi_pci_link_allocate(struct acpi_pci_link *link)
{
int irq;
int i;
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 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_get_penalty(irq) >
acpi_irq_get_penalty(link->irq.possible[i]))
irq = link->irq.possible[i];
}
}
if (acpi_irq_get_penalty(irq) >= PIRQ_PENALTY_ISA_ALWAYS) {
printk(KERN_ERR PREFIX "No IRQ available for %s [%s]. "
"Try pci=noacpi or acpi=off\n",
acpi_device_name(link->device),
acpi_device_bid(link->device));
return -ENODEV;
}
/* Attempt to enable the link device at this IRQ. */
if (acpi_pci_link_set(link, irq)) {
printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. "
"Try pci=noacpi or acpi=off\n",
acpi_device_name(link->device),
acpi_device_bid(link->device));
return -ENODEV;
} else {
printk(KERN_WARNING 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 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 *triggering,
int *polarity, char **name)
{
int result;
struct acpi_device *device;
struct acpi_pci_link *link;
result = acpi_bus_get_device(handle, &device);
if (result) {
printk(KERN_ERR PREFIX "Invalid link device\n");
return -1;
}
link = acpi_driver_data(device);
if (!link) {
printk(KERN_ERR PREFIX "Invalid link context\n");
return -1;
}
/* TBD: Support multiple index (IRQ) entries per Link Device */
if (index) {
printk(KERN_ERR PREFIX "Invalid index %d\n", index);
return -1;
}
mutex_lock(&acpi_link_lock);
if (acpi_pci_link_allocate(link)) {
mutex_unlock(&acpi_link_lock);
return -1;
}
if (!link->irq.active) {
mutex_unlock(&acpi_link_lock);
printk(KERN_ERR PREFIX "Link active IRQ is 0!\n");
return -1;
}
link->refcnt++;
mutex_unlock(&acpi_link_lock);
if (triggering)
*triggering = link->irq.triggering;
if (polarity)
*polarity = link->irq.polarity;
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 (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;
struct acpi_pci_link *link;
acpi_status result;
result = acpi_bus_get_device(handle, &device);
if (result) {
printk(KERN_ERR PREFIX "Invalid link device\n");
return -1;
}
link = acpi_driver_data(device);
if (!link) {
printk(KERN_ERR PREFIX "Invalid link context\n");
return -1;
}
mutex_lock(&acpi_link_lock);
if (!link->irq.initialized) {
mutex_unlock(&acpi_link_lock);
printk(KERN_ERR PREFIX "Link isn't initialized\n");
return -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_evaluate_object(link->device->handle, "_DIS", NULL, NULL);
mutex_unlock(&acpi_link_lock);
return (link->irq.active);
}
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
static int acpi_pci_link_add(struct acpi_device *device,
const struct acpi_device_id *not_used)
{
int result;
struct acpi_pci_link *link;
int i;
int found = 0;
link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
if (!link)
return -ENOMEM;
link->device = device;
strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
device->driver_data = link;
mutex_lock(&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(KERN_INFO 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(KERN_CONT " *%d", link->irq.possible[i]);
found = 1;
} else
printk(KERN_CONT " %d", link->irq.possible[i]);
}
printk(KERN_CONT ")");
if (!found)
printk(KERN_CONT " *%d", link->irq.active);
if (!link->device->status.enabled)
printk(KERN_CONT ", disabled.");
printk(KERN_CONT "\n");
list_add_tail(&link->list, &acpi_link_list);
end:
/* disable all links -- to be activated on use */
acpi_evaluate_object(device->handle, "_DIS", NULL, NULL);
mutex_unlock(&acpi_link_lock);
if (result)
kfree(link);
return result < 0 ? result : 1;
}
static int acpi_pci_link_resume(struct acpi_pci_link *link)
{
if (link->refcnt && link->irq.active && link->irq.initialized)
return (acpi_pci_link_set(link, link->irq.active));
return 0;
}
static void irqrouter_resume(void)
{
struct acpi_pci_link *link;
list_for_each_entry(link, &acpi_link_list, list) {
acpi_pci_link_resume(link);
}
}
static void acpi_pci_link_remove(struct acpi_device *device)
{
struct acpi_pci_link *link;
link = acpi_driver_data(device);
mutex_lock(&acpi_link_lock);
list_del(&link->list);
mutex_unlock(&acpi_link_lock);
kfree(link);
}
/*
* modify acpi_isa_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;
int new_penalty;
retval = get_option(&str, &irq);
if (!retval)
break; /* no number found */
/* see if this is a ISA IRQ */
if ((irq < 0) || (irq >= ACPI_MAX_ISA_IRQS))
continue;
if (used)
new_penalty = acpi_irq_get_penalty(irq) +
PIRQ_PENALTY_ISA_USED;
else
new_penalty = 0;
acpi_isa_irq_penalty[irq] = new_penalty;
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 ((irq >= 0) && (irq < ARRAY_SIZE(acpi_isa_irq_penalty)))
acpi_isa_irq_penalty[irq] = acpi_irq_get_penalty(irq) +
(active ? PIRQ_PENALTY_ISA_USED : PIRQ_PENALTY_PCI_USING);
}
bool acpi_isa_irq_available(int irq)
{
return irq >= 0 && (irq >= ARRAY_SIZE(acpi_isa_irq_penalty) ||
acpi_irq_get_penalty(irq) < PIRQ_PENALTY_ISA_ALWAYS);
}
/*
* 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);
static int __init acpi_irq_balance_set(char *str)
{
acpi_irq_balance = 1;
return 1;
}
__setup("acpi_irq_balance", acpi_irq_balance_set);
static struct syscore_ops irqrouter_syscore_ops = {
.resume = irqrouter_resume,
};
void __init acpi_pci_link_init(void)
{
if (acpi_noirq)
return;
if (acpi_irq_balance == -1) {
/* no command line switch: enable balancing in IOAPIC mode */
if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC)
acpi_irq_balance = 1;
else
acpi_irq_balance = 0;
}
register_syscore_ops(&irqrouter_syscore_ops);
acpi_scan_add_handler(&pci_link_handler);
}
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