kevin/linux
1
Fork 0
Code
96db255c8f
linux/drivers/acpi/pci_irq.c
Bob Moore 50eca3eb89 [ACPI] ACPICA 20050930 
Completed a major overhaul of the Resource Manager code -
specifically, optimizations in the area of the AML/internal
resource conversion code. The code has been optimized to
simplify and eliminate duplicated code, CPU stack use has
been decreased by optimizing function parameters and local
variables, and naming conventions across the manager have
been standardized for clarity and ease of maintenance (this
includes function, parameter, variable, and struct/typedef
names.)

All Resource Manager dispatch and information tables have
been moved to a single location for clarity and ease of
maintenance. One new file was created, named "rsinfo.c".

The ACPI return macros (return_ACPI_STATUS, etc.) have
been modified to guarantee that the argument is
not evaluated twice, making them less prone to macro
side-effects. However, since there exists the possibility
of additional stack use if a particular compiler cannot
optimize them (such as in the debug generation case),
the original macros are optionally available.  Note that
some invocations of the return_VALUE macro may now cause
size mismatch warnings; the return_UINT8 and return_UINT32
macros are provided to eliminate these. (From Randy Dunlap)

Implemented a new mechanism to enable debug tracing for
individual control methods. A new external interface,
acpi_debug_trace(), is provided to enable this mechanism. The
intent is to allow the host OS to easily enable and disable
tracing for problematic control methods. This interface
can be easily exposed to a user or debugger interface if
desired. See the file psxface.c for details.

acpi_ut_callocate() will now return a valid pointer if a
length of zero is specified - a length of one is used
and a warning is issued. This matches the behavior of
acpi_ut_allocate().

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2005-12-10 00:20:25 -05:00

540 lines
14 KiB
C
Raw Blame History

/*
* pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $)
*
* 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.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/config.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 <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#define _COMPONENT ACPI_PCI_COMPONENT
ACPI_MODULE_NAME("pci_irq")
static struct acpi_prt_list acpi_prt;
static DEFINE_SPINLOCK(acpi_prt_lock);
/* --------------------------------------------------------------------------
PCI IRQ Routing Table (PRT) Support
-------------------------------------------------------------------------- */
static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(int segment,
int bus,
int device, int pin)
{
struct list_head *node = NULL;
struct acpi_prt_entry *entry = NULL;
ACPI_FUNCTION_TRACE("acpi_pci_irq_find_prt_entry");
if (!acpi_prt.count)
return_PTR(NULL);
/*
* Parse through all PRT entries looking for a match on the specified
* PCI device's segment, bus, device, and pin (don't care about func).
*
*/
spin_lock(&acpi_prt_lock);
list_for_each(node, &acpi_prt.entries) {
entry = list_entry(node, struct acpi_prt_entry, node);
if ((segment == entry->id.segment)
&& (bus == entry->id.bus)
&& (device == entry->id.device)
&& (pin == entry->pin)) {
spin_unlock(&acpi_prt_lock);
return_PTR(entry);
}
}
spin_unlock(&acpi_prt_lock);
return_PTR(NULL);
}
static int
acpi_pci_irq_add_entry(acpi_handle handle,
int segment, int bus, struct acpi_pci_routing_table *prt)
{
struct acpi_prt_entry *entry = NULL;
ACPI_FUNCTION_TRACE("acpi_pci_irq_add_entry");
if (!prt)
return_VALUE(-EINVAL);
entry = kmalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
if (!entry)
return_VALUE(-ENOMEM);
memset(entry, 0, sizeof(struct acpi_prt_entry));
entry->id.segment = segment;
entry->id.bus = bus;
entry->id.device = (prt->address >> 16) & 0xFFFF;
entry->id.function = prt->address & 0xFFFF;
entry->pin = prt->pin;
/*
* Type 1: Dynamic
* ---------------
* The 'source' field specifies the PCI interrupt link device used to
* configure the IRQ assigned to this slot|dev|pin. The 'source_index'
* indicates which resource descriptor in the resource template (of
* the link device) this interrupt is allocated from.
*
* NOTE: Don't query the Link Device for IRQ information at this time
* because Link Device enumeration may not have occurred yet
* (e.g. exists somewhere 'below' this _PRT entry in the ACPI
* namespace).
*/
if (prt->source[0]) {
acpi_get_handle(handle, prt->source, &entry->link.handle);
entry->link.index = prt->source_index;
}
/*
* Type 2: Static
* --------------
* The 'source' field is NULL, and the 'source_index' field specifies
* the IRQ value, which is hardwired to specific interrupt inputs on
* the interrupt controller.
*/
else
entry->link.index = prt->source_index;
ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
" %02X:%02X:%02X[%c] -> %s[%d]\n",
entry->id.segment, entry->id.bus,
entry->id.device, ('A' + entry->pin), prt->source,
entry->link.index));
spin_lock(&acpi_prt_lock);
list_add_tail(&entry->node, &acpi_prt.entries);
acpi_prt.count++;
spin_unlock(&acpi_prt_lock);
return_VALUE(0);
}
static void
acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry)
{
if (segment == entry->id.segment && bus == entry->id.bus) {
acpi_prt.count--;
list_del(&entry->node);
kfree(entry);
}
}
int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
{
acpi_status status = AE_OK;
char *pathname = NULL;
struct acpi_buffer buffer = { 0, NULL };
struct acpi_pci_routing_table *prt = NULL;
struct acpi_pci_routing_table *entry = NULL;
static int first_time = 1;
ACPI_FUNCTION_TRACE("acpi_pci_irq_add_prt");
pathname = (char *)kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
if (!pathname)
return_VALUE(-ENOMEM);
memset(pathname, 0, ACPI_PATHNAME_MAX);
if (first_time) {
acpi_prt.count = 0;
INIT_LIST_HEAD(&acpi_prt.entries);
first_time = 0;
}
/*
* NOTE: We're given a 'handle' to the _PRT object's parent device
* (either a PCI root bridge or PCI-PCI bridge).
*/
buffer.length = ACPI_PATHNAME_MAX;
buffer.pointer = pathname;
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
pathname);
/*
* Evaluate this _PRT and add its entries to our global list (acpi_prt).
*/
buffer.length = 0;
buffer.pointer = NULL;
kfree(pathname);
status = acpi_get_irq_routing_table(handle, &buffer);
if (status != AE_BUFFER_OVERFLOW) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRT [%s]\n",
acpi_format_exception(status)));
return_VALUE(-ENODEV);
}
prt = kmalloc(buffer.length, GFP_KERNEL);
if (!prt) {
return_VALUE(-ENOMEM);
}
memset(prt, 0, buffer.length);
buffer.pointer = prt;
status = acpi_get_irq_routing_table(handle, &buffer);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRT [%s]\n",
acpi_format_exception(status)));
kfree(buffer.pointer);
return_VALUE(-ENODEV);
}
entry = prt;
while (entry && (entry->length > 0)) {
acpi_pci_irq_add_entry(handle, segment, bus, entry);
entry = (struct acpi_pci_routing_table *)
((unsigned long)entry + entry->length);
}
kfree(prt);
return_VALUE(0);
}
void acpi_pci_irq_del_prt(int segment, int bus)
{
struct list_head *node = NULL, *n = NULL;
struct acpi_prt_entry *entry = NULL;
if (!acpi_prt.count) {
return;
}
printk(KERN_DEBUG
"ACPI: Delete PCI Interrupt Routing Table for %x:%x\n", segment,
bus);
spin_lock(&acpi_prt_lock);
list_for_each_safe(node, n, &acpi_prt.entries) {
entry = list_entry(node, struct acpi_prt_entry, node);
acpi_pci_irq_del_entry(segment, bus, entry);
}
spin_unlock(&acpi_prt_lock);
}
/* --------------------------------------------------------------------------
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 *triggering, int *polarity, 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, triggering,
polarity, link);
if (irq < 0) {
ACPI_DEBUG_PRINT((ACPI_DB_WARN,
"Invalid IRQ link routing entry\n"));
return_VALUE(-1);
}
} else {
irq = entry->link.index;
*triggering = ACPI_LEVEL_SENSITIVE;
*polarity = 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 *triggering, int *polarity, 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
* failure: return -1
*/
static int
acpi_pci_irq_lookup(struct pci_bus *bus,
int device,
int pin,
int *triggering,
int *polarity, char **link, irq_lookup_func func)
{
struct acpi_prt_entry *entry = NULL;
int segment = pci_domain_nr(bus);
int bus_nr = bus->number;
int ret;
ACPI_FUNCTION_TRACE("acpi_pci_irq_lookup");
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Searching for PRT entry for %02x:%02x:%02x[%c]\n",
segment, bus_nr, device, ('A' + pin)));
entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin);
if (!entry) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PRT entry not found\n"));
return_VALUE(-1);
}
ret = func(entry, triggering, polarity, link);
return_VALUE(ret);
}
/*
* acpi_pci_irq_derive
* success: return IRQ >= 0
* failure: return < 0
*/
static int
acpi_pci_irq_derive(struct pci_dev *dev,
int pin,
int *triggering,
int *polarity, char **link, irq_lookup_func func)
{
struct pci_dev *bridge = dev;
int irq = -1;
u8 bridge_pin = 0;
ACPI_FUNCTION_TRACE("acpi_pci_irq_derive");
if (!dev)
return_VALUE(-EINVAL);
/*
* Attempt to derive an IRQ for this device from a parent bridge's
* PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
*/
while (irq < 0 && bridge->bus->self) {
pin = (pin + PCI_SLOT(bridge->devfn)) % 4;
bridge = bridge->bus->self;
if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
/* PC card has the same IRQ as its cardbridge */
pci_read_config_byte(bridge, PCI_INTERRUPT_PIN,
&bridge_pin);
if (!bridge_pin) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"No interrupt pin configured for device %s\n",
pci_name(bridge)));
return_VALUE(-1);
}
/* Pin is from 0 to 3 */
bridge_pin--;
pin = bridge_pin;
}
irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn),
pin, triggering, polarity,
link, func);
}
if (irq < 0) {
ACPI_DEBUG_PRINT((ACPI_DB_WARN,
"Unable to derive IRQ for device %s\n",
pci_name(dev)));
return_VALUE(-1);
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive IRQ %d for device %s from %s\n",
irq, pci_name(dev), pci_name(bridge)));
return_VALUE(irq);
}
/*
* acpi_pci_irq_enable
* success: return 0
* failure: return < 0
*/
int acpi_pci_irq_enable(struct pci_dev *dev)
{
int irq = 0;
u8 pin = 0;
int triggering = ACPI_LEVEL_SENSITIVE;
int polarity = ACPI_ACTIVE_LOW;
char *link = NULL;
int rc;
ACPI_FUNCTION_TRACE("acpi_pci_irq_enable");
if (!dev)
return_VALUE(-EINVAL);
pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
if (!pin) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"No interrupt pin configured for device %s\n",
pci_name(dev)));
return_VALUE(0);
}
pin--;
if (!dev->bus) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Invalid (NULL) 'bus' field\n"));
return_VALUE(-ENODEV);
}
/*
* First we check the PCI IRQ routing table (PRT) for an IRQ. PRT
* values override any BIOS-assigned IRQs set during boot.
*/
irq = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
&triggering, &polarity, &link,
acpi_pci_allocate_irq);
/*
* If no PRT entry was found, we'll try to derive an IRQ from the
* device's parent bridge.
*/
if (irq < 0)
irq = acpi_pci_irq_derive(dev, pin, &triggering,
&polarity, &link,
acpi_pci_allocate_irq);
/*
* No IRQ known to the ACPI subsystem - maybe the BIOS /
* driver reported one, then use it. Exit in any case.
*/
if (irq < 0) {
printk(KERN_WARNING PREFIX "PCI Interrupt %s[%c]: no GSI",
pci_name(dev), ('A' + pin));
/* Interrupt Line values above 0xF are forbidden */
if (dev->irq > 0 && (dev->irq <= 0xF)) {
printk(" - using IRQ %d\n", dev->irq);
acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE,
ACPI_ACTIVE_LOW);
return_VALUE(0);
} else {
printk("\n");
return_VALUE(0);
}
}
rc = acpi_register_gsi(irq, triggering, polarity);
if (rc < 0) {
printk(KERN_WARNING PREFIX "PCI Interrupt %s[%c]: failed "
"to register GSI\n", pci_name(dev), ('A' + pin));
return_VALUE(rc);
}
dev->irq = rc;
printk(KERN_INFO PREFIX "PCI Interrupt %s[%c] -> ",
pci_name(dev), 'A' + pin);
if (link)
printk("Link [%s] -> ", link);
printk("GSI %u (%s, %s) -> IRQ %d\n", irq,
(triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
(polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
return_VALUE(0);
}
EXPORT_SYMBOL(acpi_pci_irq_enable);
/* FIXME: implement x86/x86_64 version */
void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
{
}
void acpi_pci_irq_disable(struct pci_dev *dev)
{
int gsi = 0;
u8 pin = 0;
int triggering = ACPI_LEVEL_SENSITIVE;
int polarity = ACPI_ACTIVE_LOW;
ACPI_FUNCTION_TRACE("acpi_pci_irq_disable");
if (!dev || !dev->bus)
return_VOID;
pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
if (!pin)
return_VOID;
pin--;
/*
* First we check the PCI IRQ routing table (PRT) for an IRQ.
*/
gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
&triggering, &polarity, 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,
&triggering, &polarity, NULL,
acpi_pci_free_irq);
if (gsi < 0)
return_VOID;
/*
* TBD: It might be worth clearing dev->irq by magic constant
* (e.g. PCI_UNDEFINED_IRQ).
*/
printk(KERN_INFO PREFIX "PCI interrupt for device %s disabled\n",
pci_name(dev));
acpi_unregister_gsi(gsi);
return_VOID;
}
View Git Blame Copy Permalink