![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
905 lines
23 KiB
C
905 lines
23 KiB
C
/*
|
|
* 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,
|
|
},
|
|
};
|
|
|
|
struct acpi_pci_link_irq {
|
|
u8 active; /* Current IRQ */
|
|
u8 edge_level; /* All IRQs */
|
|
u8 active_high_low; /* All IRQs */
|
|
u8 initialized;
|
|
u8 resource_type;
|
|
u8 possible_count;
|
|
u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
|
|
};
|
|
|
|
struct acpi_pci_link {
|
|
struct list_head node;
|
|
struct acpi_device *device;
|
|
acpi_handle handle;
|
|
struct acpi_pci_link_irq irq;
|
|
};
|
|
|
|
static struct {
|
|
int count;
|
|
struct list_head entries;
|
|
} acpi_link;
|
|
|
|
|
|
/* --------------------------------------------------------------------------
|
|
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_KERNEL);
|
|
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)
|
|
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_get_irq
|
|
* success: return IRQ >= 0
|
|
* failure: return -1
|
|
*/
|
|
|
|
int
|
|
acpi_pci_link_get_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_get_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);
|
|
}
|
|
|
|
if (acpi_pci_link_allocate(link))
|
|
return_VALUE(-1);
|
|
|
|
if (!link->irq.active) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link active IRQ is 0!\n"));
|
|
return_VALUE(-1);
|
|
}
|
|
|
|
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);
|
|
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;
|
|
|
|
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);
|
|
|
|
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->irq.active && link->irq.initialized)
|
|
return_VALUE(acpi_pci_link_set(link, link->irq.active));
|
|
else
|
|
return_VALUE(0);
|
|
}
|
|
|
|
|
|
static int
|
|
irqrouter_resume(
|
|
struct sys_device *dev)
|
|
{
|
|
struct list_head *node = NULL;
|
|
struct acpi_pci_link *link = NULL;
|
|
|
|
ACPI_FUNCTION_TRACE("irqrouter_resume");
|
|
|
|
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);
|
|
}
|
|
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);
|
|
|
|
/* TBD: Acquire/release lock */
|
|
list_del(&link->node);
|
|
|
|
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)
|
|
{
|
|
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);
|
|
|
|
|
|
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);
|