mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Eric W. Biederman](/assets/img/avatar_default.png)
Strictly speaking on x86 (where acpi is used) dev->irq must be a dual i8259 irq input aka an isa irq. Therefore we should translate that isa irq into a gsi before passing it to a function that takes a gsi. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> LKML-Reference: <1269936436-7039-3-git-send-email-ebiederm@xmission.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
472 lines
12 KiB
C
472 lines
12 KiB
C
/*
|
|
* 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>
|
|
* (c) Copyright 2008 Hewlett-Packard Development Company, L.P.
|
|
* Bjorn Helgaas <bjorn.helgaas@hp.com>
|
|
*
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
*
|
|
* 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/dmi.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 <linux/slab.h>
|
|
#include <acpi/acpi_bus.h>
|
|
#include <acpi/acpi_drivers.h>
|
|
|
|
#define PREFIX "ACPI: "
|
|
|
|
#define _COMPONENT ACPI_PCI_COMPONENT
|
|
ACPI_MODULE_NAME("pci_irq");
|
|
|
|
struct acpi_prt_entry {
|
|
struct list_head list;
|
|
struct acpi_pci_id id;
|
|
u8 pin;
|
|
acpi_handle link;
|
|
u32 index; /* GSI, or link _CRS index */
|
|
};
|
|
|
|
static LIST_HEAD(acpi_prt_list);
|
|
static DEFINE_SPINLOCK(acpi_prt_lock);
|
|
|
|
static inline char pin_name(int pin)
|
|
{
|
|
return 'A' + pin - 1;
|
|
}
|
|
|
|
/* --------------------------------------------------------------------------
|
|
PCI IRQ Routing Table (PRT) Support
|
|
-------------------------------------------------------------------------- */
|
|
|
|
static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
|
|
int pin)
|
|
{
|
|
struct acpi_prt_entry *entry;
|
|
int segment = pci_domain_nr(dev->bus);
|
|
int bus = dev->bus->number;
|
|
int device = PCI_SLOT(dev->devfn);
|
|
|
|
spin_lock(&acpi_prt_lock);
|
|
list_for_each_entry(entry, &acpi_prt_list, list) {
|
|
if ((segment == entry->id.segment)
|
|
&& (bus == entry->id.bus)
|
|
&& (device == entry->id.device)
|
|
&& (pin == entry->pin)) {
|
|
spin_unlock(&acpi_prt_lock);
|
|
return entry;
|
|
}
|
|
}
|
|
spin_unlock(&acpi_prt_lock);
|
|
return NULL;
|
|
}
|
|
|
|
/* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
|
|
static const struct dmi_system_id medion_md9580[] = {
|
|
{
|
|
.ident = "Medion MD9580-F laptop",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
|
|
},
|
|
},
|
|
{ }
|
|
};
|
|
|
|
/* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
|
|
static const struct dmi_system_id dell_optiplex[] = {
|
|
{
|
|
.ident = "Dell Optiplex GX1",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
|
|
},
|
|
},
|
|
{ }
|
|
};
|
|
|
|
/* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
|
|
static const struct dmi_system_id hp_t5710[] = {
|
|
{
|
|
.ident = "HP t5710",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
|
|
},
|
|
},
|
|
{ }
|
|
};
|
|
|
|
struct prt_quirk {
|
|
const struct dmi_system_id *system;
|
|
unsigned int segment;
|
|
unsigned int bus;
|
|
unsigned int device;
|
|
unsigned char pin;
|
|
const char *source; /* according to BIOS */
|
|
const char *actual_source;
|
|
};
|
|
|
|
#define PCI_INTX_PIN(c) (c - 'A' + 1)
|
|
|
|
/*
|
|
* These systems have incorrect _PRT entries. The BIOS claims the PCI
|
|
* interrupt at the listed segment/bus/device/pin is connected to the first
|
|
* link device, but it is actually connected to the second.
|
|
*/
|
|
static const struct prt_quirk prt_quirks[] = {
|
|
{ medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
|
|
"\\_SB_.PCI0.ISA_.LNKA",
|
|
"\\_SB_.PCI0.ISA_.LNKB"},
|
|
{ dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
|
|
"\\_SB_.LNKB",
|
|
"\\_SB_.LNKA"},
|
|
{ hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
|
|
"\\_SB_.PCI0.LNK1",
|
|
"\\_SB_.PCI0.LNK3"},
|
|
};
|
|
|
|
static void do_prt_fixups(struct acpi_prt_entry *entry,
|
|
struct acpi_pci_routing_table *prt)
|
|
{
|
|
int i;
|
|
const struct prt_quirk *quirk;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
|
|
quirk = &prt_quirks[i];
|
|
|
|
/* All current quirks involve link devices, not GSIs */
|
|
if (!prt->source)
|
|
continue;
|
|
|
|
if (dmi_check_system(quirk->system) &&
|
|
entry->id.segment == quirk->segment &&
|
|
entry->id.bus == quirk->bus &&
|
|
entry->id.device == quirk->device &&
|
|
entry->pin == quirk->pin &&
|
|
!strcmp(prt->source, quirk->source) &&
|
|
strlen(prt->source) >= strlen(quirk->actual_source)) {
|
|
printk(KERN_WARNING PREFIX "firmware reports "
|
|
"%04x:%02x:%02x PCI INT %c connected to %s; "
|
|
"changing to %s\n",
|
|
entry->id.segment, entry->id.bus,
|
|
entry->id.device, pin_name(entry->pin),
|
|
prt->source, quirk->actual_source);
|
|
strcpy(prt->source, quirk->actual_source);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int acpi_pci_irq_add_entry(acpi_handle handle, struct pci_bus *bus,
|
|
struct acpi_pci_routing_table *prt)
|
|
{
|
|
struct acpi_prt_entry *entry;
|
|
|
|
entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
|
|
if (!entry)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses
|
|
* 1=INTA, 2=INTB. We use the PCI encoding throughout, so convert
|
|
* it here.
|
|
*/
|
|
entry->id.segment = pci_domain_nr(bus);
|
|
entry->id.bus = bus->number;
|
|
entry->id.device = (prt->address >> 16) & 0xFFFF;
|
|
entry->pin = prt->pin + 1;
|
|
|
|
do_prt_fixups(entry, prt);
|
|
|
|
entry->index = prt->source_index;
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
|
|
" %04x:%02x:%02x[%c] -> %s[%d]\n",
|
|
entry->id.segment, entry->id.bus,
|
|
entry->id.device, pin_name(entry->pin),
|
|
prt->source, entry->index));
|
|
|
|
spin_lock(&acpi_prt_lock);
|
|
list_add_tail(&entry->list, &acpi_prt_list);
|
|
spin_unlock(&acpi_prt_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int acpi_pci_irq_add_prt(acpi_handle handle, struct pci_bus *bus)
|
|
{
|
|
acpi_status status;
|
|
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
|
|
struct acpi_pci_routing_table *entry;
|
|
|
|
/* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
|
|
status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
|
|
if (ACPI_FAILURE(status))
|
|
return -ENODEV;
|
|
|
|
printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
|
|
(char *) buffer.pointer);
|
|
|
|
kfree(buffer.pointer);
|
|
|
|
buffer.length = ACPI_ALLOCATE_BUFFER;
|
|
buffer.pointer = NULL;
|
|
|
|
status = acpi_get_irq_routing_table(handle, &buffer);
|
|
if (ACPI_FAILURE(status)) {
|
|
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
|
|
acpi_format_exception(status)));
|
|
kfree(buffer.pointer);
|
|
return -ENODEV;
|
|
}
|
|
|
|
entry = buffer.pointer;
|
|
while (entry && (entry->length > 0)) {
|
|
acpi_pci_irq_add_entry(handle, bus, entry);
|
|
entry = (struct acpi_pci_routing_table *)
|
|
((unsigned long)entry + entry->length);
|
|
}
|
|
|
|
kfree(buffer.pointer);
|
|
return 0;
|
|
}
|
|
|
|
void acpi_pci_irq_del_prt(struct pci_bus *bus)
|
|
{
|
|
struct acpi_prt_entry *entry, *tmp;
|
|
|
|
printk(KERN_DEBUG
|
|
"ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
|
|
pci_domain_nr(bus), bus->number);
|
|
spin_lock(&acpi_prt_lock);
|
|
list_for_each_entry_safe(entry, tmp, &acpi_prt_list, list) {
|
|
if (pci_domain_nr(bus) == entry->id.segment
|
|
&& bus->number == entry->id.bus) {
|
|
list_del(&entry->list);
|
|
kfree(entry);
|
|
}
|
|
}
|
|
spin_unlock(&acpi_prt_lock);
|
|
}
|
|
|
|
/* --------------------------------------------------------------------------
|
|
PCI Interrupt Routing Support
|
|
-------------------------------------------------------------------------- */
|
|
static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
|
|
{
|
|
struct acpi_prt_entry *entry;
|
|
struct pci_dev *bridge;
|
|
u8 bridge_pin, orig_pin = pin;
|
|
|
|
entry = acpi_pci_irq_find_prt_entry(dev, pin);
|
|
if (entry) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
|
|
pci_name(dev), pin_name(pin)));
|
|
return entry;
|
|
}
|
|
|
|
/*
|
|
* 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).
|
|
*/
|
|
bridge = dev->bus->self;
|
|
while (bridge) {
|
|
pin = pci_swizzle_interrupt_pin(dev, pin);
|
|
|
|
if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
|
|
/* PC card has the same IRQ as its cardbridge */
|
|
bridge_pin = bridge->pin;
|
|
if (!bridge_pin) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"No interrupt pin configured for device %s\n",
|
|
pci_name(bridge)));
|
|
return NULL;
|
|
}
|
|
pin = bridge_pin;
|
|
}
|
|
|
|
entry = acpi_pci_irq_find_prt_entry(bridge, pin);
|
|
if (entry) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"Derived GSI for %s INT %c from %s\n",
|
|
pci_name(dev), pin_name(orig_pin),
|
|
pci_name(bridge)));
|
|
return entry;
|
|
}
|
|
|
|
dev = bridge;
|
|
bridge = dev->bus->self;
|
|
}
|
|
|
|
dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
|
|
pin_name(orig_pin));
|
|
return NULL;
|
|
}
|
|
|
|
int acpi_pci_irq_enable(struct pci_dev *dev)
|
|
{
|
|
struct acpi_prt_entry *entry;
|
|
int gsi;
|
|
u8 pin;
|
|
int triggering = ACPI_LEVEL_SENSITIVE;
|
|
int polarity = ACPI_ACTIVE_LOW;
|
|
char *link = NULL;
|
|
char link_desc[16];
|
|
int rc;
|
|
|
|
pin = dev->pin;
|
|
if (!pin) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"No interrupt pin configured for device %s\n",
|
|
pci_name(dev)));
|
|
return 0;
|
|
}
|
|
|
|
entry = acpi_pci_irq_lookup(dev, pin);
|
|
if (!entry) {
|
|
/*
|
|
* IDE legacy mode controller IRQs are magic. Why do compat
|
|
* extensions always make such a nasty mess.
|
|
*/
|
|
if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
|
|
(dev->class & 0x05) == 0)
|
|
return 0;
|
|
}
|
|
|
|
if (entry) {
|
|
if (entry->link)
|
|
gsi = acpi_pci_link_allocate_irq(entry->link,
|
|
entry->index,
|
|
&triggering, &polarity,
|
|
&link);
|
|
else
|
|
gsi = entry->index;
|
|
} else
|
|
gsi = -1;
|
|
|
|
/*
|
|
* No IRQ known to the ACPI subsystem - maybe the BIOS /
|
|
* driver reported one, then use it. Exit in any case.
|
|
*/
|
|
if (gsi < 0) {
|
|
u32 dev_gsi;
|
|
dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin));
|
|
/* Interrupt Line values above 0xF are forbidden */
|
|
if (dev->irq > 0 && (dev->irq <= 0xF) &&
|
|
(acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) {
|
|
printk(" - using ISA IRQ %d\n", dev->irq);
|
|
acpi_register_gsi(&dev->dev, dev_gsi,
|
|
ACPI_LEVEL_SENSITIVE,
|
|
ACPI_ACTIVE_LOW);
|
|
return 0;
|
|
} else {
|
|
printk("\n");
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity);
|
|
if (rc < 0) {
|
|
dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
|
|
pin_name(pin));
|
|
return rc;
|
|
}
|
|
dev->irq = rc;
|
|
|
|
if (link)
|
|
snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
|
|
else
|
|
link_desc[0] = '\0';
|
|
|
|
dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
|
|
pin_name(pin), link_desc, gsi,
|
|
(triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
|
|
(polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* FIXME: implement x86/x86_64 version */
|
|
void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
|
|
{
|
|
}
|
|
|
|
void acpi_pci_irq_disable(struct pci_dev *dev)
|
|
{
|
|
struct acpi_prt_entry *entry;
|
|
int gsi;
|
|
u8 pin;
|
|
|
|
pin = dev->pin;
|
|
if (!pin)
|
|
return;
|
|
|
|
entry = acpi_pci_irq_lookup(dev, pin);
|
|
if (!entry)
|
|
return;
|
|
|
|
if (entry->link)
|
|
gsi = acpi_pci_link_free_irq(entry->link);
|
|
else
|
|
gsi = entry->index;
|
|
|
|
/*
|
|
* TBD: It might be worth clearing dev->irq by magic constant
|
|
* (e.g. PCI_UNDEFINED_IRQ).
|
|
*/
|
|
|
|
dev_info(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
|
|
acpi_unregister_gsi(gsi);
|
|
}
|