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![Bjorn Helgaas](/assets/img/avatar_default.png)
There's no reason to pass around segment, bus, and device independently when we can just pass the pci_dev pointer, which carries all those already. The pci_dev contains an interrupt pin, too, but we still have to pass both the pci_dev and the pin because when we use a bridge to derive an IRQ, we need the pin from the downstream device, not the bridge. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Len Brown <len.brown@intel.com>
595 lines
15 KiB
C
595 lines
15 KiB
C
/*
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* pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $)
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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* Copyright (C) 2002 Dominik Brodowski <devel@brodo.de>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/dmi.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/proc_fs.h>
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#include <linux/spinlock.h>
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#include <linux/pm.h>
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#include <linux/pci.h>
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#include <linux/acpi.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#define _COMPONENT ACPI_PCI_COMPONENT
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ACPI_MODULE_NAME("pci_irq");
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struct acpi_prt_entry {
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struct list_head node;
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struct acpi_pci_id id;
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u8 pin;
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struct {
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acpi_handle handle;
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u32 index;
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} link;
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u32 irq;
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};
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struct acpi_prt_list {
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int count;
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struct list_head entries;
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};
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static struct acpi_prt_list acpi_prt;
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static DEFINE_SPINLOCK(acpi_prt_lock);
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static inline char pin_name(int pin)
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{
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return 'A' + pin - 1;
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}
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/* --------------------------------------------------------------------------
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PCI IRQ Routing Table (PRT) Support
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-------------------------------------------------------------------------- */
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static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
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int pin)
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{
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struct acpi_prt_entry *entry = NULL;
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int segment = pci_domain_nr(dev->bus);
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int bus = dev->bus->number;
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int device = PCI_SLOT(dev->devfn);
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if (!acpi_prt.count)
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return NULL;
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/*
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* Parse through all PRT entries looking for a match on the specified
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* PCI device's segment, bus, device, and pin (don't care about func).
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*
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*/
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spin_lock(&acpi_prt_lock);
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list_for_each_entry(entry, &acpi_prt.entries, node) {
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if ((segment == entry->id.segment)
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&& (bus == entry->id.bus)
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&& (device == entry->id.device)
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&& (pin == entry->pin)) {
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spin_unlock(&acpi_prt_lock);
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return entry;
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}
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}
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spin_unlock(&acpi_prt_lock);
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return NULL;
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}
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/* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
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static struct dmi_system_id medion_md9580[] = {
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{
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.ident = "Medion MD9580-F laptop",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
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DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
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},
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},
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{ }
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};
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/* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
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static struct dmi_system_id dell_optiplex[] = {
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{
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.ident = "Dell Optiplex GX1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
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},
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},
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{ }
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};
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/* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
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static struct dmi_system_id hp_t5710[] = {
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{
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.ident = "HP t5710",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
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DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
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DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
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},
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},
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{ }
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};
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struct prt_quirk {
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struct dmi_system_id *system;
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unsigned int segment;
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unsigned int bus;
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unsigned int device;
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unsigned char pin;
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char *source; /* according to BIOS */
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char *actual_source;
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};
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#define PCI_INTX_PIN(c) (c - 'A' + 1)
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/*
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* These systems have incorrect _PRT entries. The BIOS claims the PCI
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* interrupt at the listed segment/bus/device/pin is connected to the first
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* link device, but it is actually connected to the second.
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*/
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static struct prt_quirk prt_quirks[] = {
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{ medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
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"\\_SB_.PCI0.ISA_.LNKA",
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"\\_SB_.PCI0.ISA_.LNKB"},
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{ dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
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"\\_SB_.LNKB",
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"\\_SB_.LNKA"},
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{ hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
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"\\_SB_.PCI0.LNK1",
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"\\_SB_.PCI0.LNK3"},
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};
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static void
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do_prt_fixups(struct acpi_prt_entry *entry, struct acpi_pci_routing_table *prt)
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{
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int i;
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struct prt_quirk *quirk;
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for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
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quirk = &prt_quirks[i];
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/* All current quirks involve link devices, not GSIs */
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if (!prt->source)
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continue;
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if (dmi_check_system(quirk->system) &&
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entry->id.segment == quirk->segment &&
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entry->id.bus == quirk->bus &&
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entry->id.device == quirk->device &&
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entry->pin == quirk->pin &&
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!strcmp(prt->source, quirk->source) &&
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strlen(prt->source) >= strlen(quirk->actual_source)) {
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printk(KERN_WARNING PREFIX "firmware reports "
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"%04x:%02x:%02x PCI INT %c connected to %s; "
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"changing to %s\n",
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entry->id.segment, entry->id.bus,
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entry->id.device, pin_name(entry->pin),
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prt->source, quirk->actual_source);
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strcpy(prt->source, quirk->actual_source);
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}
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}
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}
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static int
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acpi_pci_irq_add_entry(acpi_handle handle,
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int segment, int bus, struct acpi_pci_routing_table *prt)
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{
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struct acpi_prt_entry *entry = NULL;
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entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
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if (!entry)
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return -ENOMEM;
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/*
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* Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses
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* 1=INTA, 2=INTB. We use the PCI encoding throughout, so convert
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* it here.
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*/
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entry->id.segment = segment;
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entry->id.bus = bus;
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entry->id.device = (prt->address >> 16) & 0xFFFF;
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entry->pin = prt->pin + 1;
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do_prt_fixups(entry, prt);
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/*
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* Type 1: Dynamic
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* ---------------
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* The 'source' field specifies the PCI interrupt link device used to
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* configure the IRQ assigned to this slot|dev|pin. The 'source_index'
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* indicates which resource descriptor in the resource template (of
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* the link device) this interrupt is allocated from.
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*
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* NOTE: Don't query the Link Device for IRQ information at this time
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* because Link Device enumeration may not have occurred yet
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* (e.g. exists somewhere 'below' this _PRT entry in the ACPI
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* namespace).
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*/
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if (prt->source[0]) {
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acpi_get_handle(handle, prt->source, &entry->link.handle);
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entry->link.index = prt->source_index;
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}
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/*
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* Type 2: Static
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* --------------
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* The 'source' field is NULL, and the 'source_index' field specifies
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* the IRQ value, which is hardwired to specific interrupt inputs on
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* the interrupt controller.
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*/
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else
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entry->link.index = prt->source_index;
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ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
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" %04x:%02x:%02x[%c] -> %s[%d]\n",
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entry->id.segment, entry->id.bus,
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entry->id.device, pin_name(entry->pin),
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prt->source, entry->link.index));
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spin_lock(&acpi_prt_lock);
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list_add_tail(&entry->node, &acpi_prt.entries);
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acpi_prt.count++;
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spin_unlock(&acpi_prt_lock);
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return 0;
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}
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static void
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acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry)
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{
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if (segment == entry->id.segment && bus == entry->id.bus) {
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acpi_prt.count--;
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list_del(&entry->node);
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kfree(entry);
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}
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}
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int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
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{
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acpi_status status;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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struct acpi_pci_routing_table *entry;
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static int first_time = 1;
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if (first_time) {
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acpi_prt.count = 0;
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INIT_LIST_HEAD(&acpi_prt.entries);
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first_time = 0;
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}
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/* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
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status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
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(char *) buffer.pointer);
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kfree(buffer.pointer);
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buffer.length = ACPI_ALLOCATE_BUFFER;
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buffer.pointer = NULL;
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status = acpi_get_irq_routing_table(handle, &buffer);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
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acpi_format_exception(status)));
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kfree(buffer.pointer);
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return -ENODEV;
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}
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entry = buffer.pointer;
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while (entry && (entry->length > 0)) {
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acpi_pci_irq_add_entry(handle, segment, bus, entry);
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entry = (struct acpi_pci_routing_table *)
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((unsigned long)entry + entry->length);
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}
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kfree(buffer.pointer);
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return 0;
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}
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void acpi_pci_irq_del_prt(int segment, int bus)
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{
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struct list_head *node = NULL, *n = NULL;
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struct acpi_prt_entry *entry = NULL;
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if (!acpi_prt.count) {
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return;
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}
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printk(KERN_DEBUG
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"ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
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segment, bus);
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spin_lock(&acpi_prt_lock);
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list_for_each_safe(node, n, &acpi_prt.entries) {
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entry = list_entry(node, struct acpi_prt_entry, node);
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acpi_pci_irq_del_entry(segment, bus, entry);
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}
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spin_unlock(&acpi_prt_lock);
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}
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/* --------------------------------------------------------------------------
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PCI Interrupt Routing Support
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-------------------------------------------------------------------------- */
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typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **);
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static int
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acpi_pci_allocate_irq(struct acpi_prt_entry *entry,
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int *triggering, int *polarity, char **link)
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{
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int irq;
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if (entry->link.handle) {
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irq = acpi_pci_link_allocate_irq(entry->link.handle,
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entry->link.index, triggering,
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polarity, link);
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if (irq < 0) {
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printk(KERN_WARNING PREFIX
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"Invalid IRQ link routing entry\n");
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return -1;
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}
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} else {
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irq = entry->link.index;
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*triggering = ACPI_LEVEL_SENSITIVE;
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*polarity = ACPI_ACTIVE_LOW;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found GSI %d\n", irq));
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return irq;
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}
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static int
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acpi_pci_free_irq(struct acpi_prt_entry *entry,
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int *triggering, int *polarity, char **link)
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{
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int irq;
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if (entry->link.handle) {
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irq = acpi_pci_link_free_irq(entry->link.handle);
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} else {
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irq = entry->link.index;
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}
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return irq;
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}
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/*
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* acpi_pci_irq_lookup
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* success: return IRQ >= 0
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* failure: return -1
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*/
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static int
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acpi_pci_irq_lookup(struct pci_dev *dev, int pin,
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int *triggering,
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int *polarity, char **link, irq_lookup_func func)
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{
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struct acpi_prt_entry *entry = NULL;
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int ret;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Searching for _PRT entry for %s[%c]\n",
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pci_name(dev), pin_name(pin)));
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entry = acpi_pci_irq_find_prt_entry(dev, pin);
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if (!entry) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_PRT entry not found\n"));
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return -1;
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}
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ret = func(entry, triggering, polarity, link);
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return ret;
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}
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/*
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* acpi_pci_irq_derive
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* success: return IRQ >= 0
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* failure: return < 0
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*/
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static int
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acpi_pci_irq_derive(struct pci_dev *dev,
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int pin,
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int *triggering,
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int *polarity, char **link, irq_lookup_func func)
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{
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struct pci_dev *bridge = dev;
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int irq = -1;
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u8 bridge_pin = 0, orig_pin = pin;
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/*
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* Attempt to derive an IRQ for this device from a parent bridge's
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* PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
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*/
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while (irq < 0 && bridge->bus->self) {
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pin = (((pin - 1) + PCI_SLOT(bridge->devfn)) % 4) + 1;
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bridge = bridge->bus->self;
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if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
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/* PC card has the same IRQ as its cardbridge */
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bridge_pin = bridge->pin;
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if (!bridge_pin) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"No interrupt pin configured for device %s\n",
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pci_name(bridge)));
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return -1;
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}
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pin = bridge_pin;
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}
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irq = acpi_pci_irq_lookup(bridge,
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pin, triggering, polarity,
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link, func);
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}
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if (irq < 0) {
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dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
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pin_name(orig_pin));
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return -1;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive GSI %d for device %s from %s\n",
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irq, pci_name(dev), pci_name(bridge)));
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return irq;
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}
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/*
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* acpi_pci_irq_enable
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* success: return 0
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* failure: return < 0
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*/
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int acpi_pci_irq_enable(struct pci_dev *dev)
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{
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int gsi = 0;
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u8 pin = 0;
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int triggering = ACPI_LEVEL_SENSITIVE;
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int polarity = ACPI_ACTIVE_LOW;
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char *link = NULL;
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char link_desc[16];
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int rc;
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pin = dev->pin;
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if (!pin) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"No interrupt pin configured for device %s\n",
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pci_name(dev)));
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return 0;
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}
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/*
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* First we check the PCI IRQ routing table (PRT) for an IRQ. PRT
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* values override any BIOS-assigned IRQs set during boot.
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*/
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gsi = acpi_pci_irq_lookup(dev, pin,
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&triggering, &polarity, &link,
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acpi_pci_allocate_irq);
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/*
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* If no PRT entry was found, we'll try to derive an IRQ from the
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* device's parent bridge.
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*/
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if (gsi < 0)
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gsi = acpi_pci_irq_derive(dev, pin, &triggering,
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&polarity, &link,
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acpi_pci_allocate_irq);
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if (gsi < 0) {
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/*
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* IDE legacy mode controller IRQs are magic. Why do compat
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* extensions always make such a nasty mess.
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*/
|
|
if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
|
|
(dev->class & 0x05) == 0)
|
|
return 0;
|
|
}
|
|
/*
|
|
* No IRQ known to the ACPI subsystem - maybe the BIOS /
|
|
* driver reported one, then use it. Exit in any case.
|
|
*/
|
|
if (gsi < 0) {
|
|
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)) {
|
|
printk(" - using IRQ %d\n", dev->irq);
|
|
acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE,
|
|
ACPI_ACTIVE_LOW);
|
|
return 0;
|
|
} else {
|
|
printk("\n");
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
rc = acpi_register_gsi(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)
|
|
{
|
|
int gsi = 0;
|
|
u8 pin = 0;
|
|
int triggering = ACPI_LEVEL_SENSITIVE;
|
|
int polarity = ACPI_ACTIVE_LOW;
|
|
|
|
|
|
pin = dev->pin;
|
|
if (!pin)
|
|
return;
|
|
|
|
/*
|
|
* First we check the PCI IRQ routing table (PRT) for an IRQ.
|
|
*/
|
|
gsi = acpi_pci_irq_lookup(dev, 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;
|
|
|
|
/*
|
|
* 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);
|
|
}
|