85b8582d7c
When the runtime PM is activated on PCI, if a device switches state frequently (e.g. an EHCI controller with autosuspending USB devices connected) the PCI configuration traces might be very verbose in the kernel log. Let's guard those traces with DEBUG condition. Acked-by: "Rafael J. Wysocki" <rjw@sisk.pl> Signed-off-by: Vincent Palatin <vpalatin@chromium.org> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
529 lines
14 KiB
C
529 lines
14 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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* (c) Copyright 2008 Hewlett-Packard Development Company, L.P.
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* Bjorn Helgaas <bjorn.helgaas@hp.com>
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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/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 <linux/slab.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#define PREFIX "ACPI: "
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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 list;
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struct acpi_pci_id id;
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u8 pin;
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acpi_handle link;
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u32 index; /* GSI, or link _CRS index */
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};
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static LIST_HEAD(acpi_prt_list);
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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;
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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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spin_lock(&acpi_prt_lock);
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list_for_each_entry(entry, &acpi_prt_list, list) {
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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 const 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 const 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 const 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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const 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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const char *source; /* according to BIOS */
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const 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 const 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 do_prt_fixups(struct acpi_prt_entry *entry,
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struct acpi_pci_routing_table *prt)
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{
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int i;
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const 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 acpi_pci_irq_add_entry(acpi_handle handle, struct pci_bus *bus,
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struct acpi_pci_routing_table *prt)
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{
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struct acpi_prt_entry *entry;
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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 = pci_domain_nr(bus);
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entry->id.bus = bus->number;
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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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entry->index = prt->source_index;
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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);
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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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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->index));
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spin_lock(&acpi_prt_lock);
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list_add_tail(&entry->list, &acpi_prt_list);
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spin_unlock(&acpi_prt_lock);
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return 0;
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}
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int acpi_pci_irq_add_prt(acpi_handle handle, struct pci_bus *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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/* '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, 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(struct pci_bus *bus)
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{
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struct acpi_prt_entry *entry, *tmp;
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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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pci_domain_nr(bus), bus->number);
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spin_lock(&acpi_prt_lock);
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list_for_each_entry_safe(entry, tmp, &acpi_prt_list, list) {
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if (pci_domain_nr(bus) == entry->id.segment
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&& bus->number == entry->id.bus) {
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list_del(&entry->list);
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kfree(entry);
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}
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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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#ifdef CONFIG_X86_IO_APIC
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extern int noioapicquirk;
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extern int noioapicreroute;
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static int bridge_has_boot_interrupt_variant(struct pci_bus *bus)
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{
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struct pci_bus *bus_it;
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for (bus_it = bus ; bus_it ; bus_it = bus_it->parent) {
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if (!bus_it->self)
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return 0;
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if (bus_it->self->irq_reroute_variant)
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return bus_it->self->irq_reroute_variant;
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}
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return 0;
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}
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/*
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* Some chipsets (e.g. Intel 6700PXH) generate a legacy INTx when the IRQ
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* entry in the chipset's IO-APIC is masked (as, e.g. the RT kernel does
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* during interrupt handling). When this INTx generation cannot be disabled,
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* we reroute these interrupts to their legacy equivalent to get rid of
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* spurious interrupts.
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*/
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static int acpi_reroute_boot_interrupt(struct pci_dev *dev,
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struct acpi_prt_entry *entry)
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{
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if (noioapicquirk || noioapicreroute) {
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return 0;
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} else {
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switch (bridge_has_boot_interrupt_variant(dev->bus)) {
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case 0:
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/* no rerouting necessary */
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return 0;
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case INTEL_IRQ_REROUTE_VARIANT:
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/*
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* Remap according to INTx routing table in 6700PXH
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* specs, intel order number 302628-002, section
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* 2.15.2. Other chipsets (80332, ...) have the same
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* mapping and are handled here as well.
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*/
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dev_info(&dev->dev, "PCI IRQ %d -> rerouted to legacy "
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"IRQ %d\n", entry->index,
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(entry->index % 4) + 16);
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entry->index = (entry->index % 4) + 16;
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return 1;
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default:
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dev_warn(&dev->dev, "Cannot reroute IRQ %d to legacy "
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"IRQ: unknown mapping\n", entry->index);
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return -1;
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}
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}
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}
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#endif /* CONFIG_X86_IO_APIC */
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static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
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{
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struct acpi_prt_entry *entry;
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struct pci_dev *bridge;
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u8 bridge_pin, orig_pin = pin;
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entry = acpi_pci_irq_find_prt_entry(dev, pin);
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if (entry) {
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#ifdef CONFIG_X86_IO_APIC
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acpi_reroute_boot_interrupt(dev, entry);
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#endif /* CONFIG_X86_IO_APIC */
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
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pci_name(dev), pin_name(pin)));
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return entry;
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}
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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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bridge = dev->bus->self;
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while (bridge) {
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pin = pci_swizzle_interrupt_pin(dev, pin);
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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 NULL;
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}
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pin = bridge_pin;
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}
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entry = acpi_pci_irq_find_prt_entry(bridge, pin);
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if (entry) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Derived GSI for %s INT %c from %s\n",
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pci_name(dev), pin_name(orig_pin),
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pci_name(bridge)));
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return entry;
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}
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dev = bridge;
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bridge = dev->bus->self;
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}
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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 NULL;
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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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struct acpi_prt_entry *entry;
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int gsi;
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u8 pin;
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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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entry = acpi_pci_irq_lookup(dev, pin);
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if (!entry) {
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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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*/
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if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
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(dev->class & 0x05) == 0)
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return 0;
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}
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if (entry) {
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if (entry->link)
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gsi = acpi_pci_link_allocate_irq(entry->link,
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entry->index,
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&triggering, &polarity,
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&link);
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else
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gsi = entry->index;
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} else
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gsi = -1;
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/*
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* No IRQ known to the ACPI subsystem - maybe the BIOS /
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* driver reported one, then use it. Exit in any case.
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*/
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if (gsi < 0) {
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u32 dev_gsi;
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dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin));
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/* Interrupt Line values above 0xF are forbidden */
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if (dev->irq > 0 && (dev->irq <= 0xF) &&
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(acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) {
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printk(" - using ISA IRQ %d\n", dev->irq);
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acpi_register_gsi(&dev->dev, dev_gsi,
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ACPI_LEVEL_SENSITIVE,
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ACPI_ACTIVE_LOW);
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return 0;
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} else {
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printk("\n");
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return 0;
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}
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}
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rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity);
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if (rc < 0) {
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dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
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pin_name(pin));
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return rc;
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}
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dev->irq = rc;
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if (link)
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snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
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else
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link_desc[0] = '\0';
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dev_dbg(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
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pin_name(pin), link_desc, gsi,
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(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_dbg(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
|
|
acpi_unregister_gsi(gsi);
|
|
}
|