| /* |
| * 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/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 inline char pin_name(int pin) |
| { |
| return 'A' + pin - 1; |
| } |
| |
| /* -------------------------------------------------------------------------- |
| PCI IRQ Routing Table (PRT) Support |
| -------------------------------------------------------------------------- */ |
| |
| /* 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_check_entry(acpi_handle handle, struct pci_dev *dev, |
| int pin, struct acpi_pci_routing_table *prt, |
| struct acpi_prt_entry **entry_ptr) |
| { |
| int segment = pci_domain_nr(dev->bus); |
| int bus = dev->bus->number; |
| int device = PCI_SLOT(dev->devfn); |
| struct acpi_prt_entry *entry; |
| |
| if (((prt->address >> 16) & 0xffff) != device || |
| prt->pin + 1 != pin) |
| return -ENODEV; |
| |
| 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 = segment; |
| entry->id.bus = bus; |
| 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)); |
| |
| *entry_ptr = entry; |
| |
| return 0; |
| } |
| |
| static int acpi_pci_irq_find_prt_entry(struct pci_dev *dev, |
| int pin, struct acpi_prt_entry **entry_ptr) |
| { |
| acpi_status status; |
| struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| struct acpi_pci_routing_table *entry; |
| acpi_handle handle = NULL; |
| |
| if (dev->bus->bridge) |
| handle = ACPI_HANDLE(dev->bus->bridge); |
| |
| if (!handle) |
| return -ENODEV; |
| |
| /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */ |
| status = acpi_get_irq_routing_table(handle, &buffer); |
| if (ACPI_FAILURE(status)) { |
| kfree(buffer.pointer); |
| return -ENODEV; |
| } |
| |
| entry = buffer.pointer; |
| while (entry && (entry->length > 0)) { |
| if (!acpi_pci_irq_check_entry(handle, dev, pin, |
| entry, entry_ptr)) |
| break; |
| entry = (struct acpi_pci_routing_table *) |
| ((unsigned long)entry + entry->length); |
| } |
| |
| kfree(buffer.pointer); |
| return 0; |
| } |
| |
| /* -------------------------------------------------------------------------- |
| PCI Interrupt Routing Support |
| -------------------------------------------------------------------------- */ |
| #ifdef CONFIG_X86_IO_APIC |
| extern int noioapicquirk; |
| extern int noioapicreroute; |
| |
| static int bridge_has_boot_interrupt_variant(struct pci_bus *bus) |
| { |
| struct pci_bus *bus_it; |
| |
| for (bus_it = bus ; bus_it ; bus_it = bus_it->parent) { |
| if (!bus_it->self) |
| return 0; |
| if (bus_it->self->irq_reroute_variant) |
| return bus_it->self->irq_reroute_variant; |
| } |
| return 0; |
| } |
| |
| /* |
| * Some chipsets (e.g. Intel 6700PXH) generate a legacy INTx when the IRQ |
| * entry in the chipset's IO-APIC is masked (as, e.g. the RT kernel does |
| * during interrupt handling). When this INTx generation cannot be disabled, |
| * we reroute these interrupts to their legacy equivalent to get rid of |
| * spurious interrupts. |
| */ |
| static int acpi_reroute_boot_interrupt(struct pci_dev *dev, |
| struct acpi_prt_entry *entry) |
| { |
| if (noioapicquirk || noioapicreroute) { |
| return 0; |
| } else { |
| switch (bridge_has_boot_interrupt_variant(dev->bus)) { |
| case 0: |
| /* no rerouting necessary */ |
| return 0; |
| case INTEL_IRQ_REROUTE_VARIANT: |
| /* |
| * Remap according to INTx routing table in 6700PXH |
| * specs, intel order number 302628-002, section |
| * 2.15.2. Other chipsets (80332, ...) have the same |
| * mapping and are handled here as well. |
| */ |
| dev_info(&dev->dev, "PCI IRQ %d -> rerouted to legacy " |
| "IRQ %d\n", entry->index, |
| (entry->index % 4) + 16); |
| entry->index = (entry->index % 4) + 16; |
| return 1; |
| default: |
| dev_warn(&dev->dev, "Cannot reroute IRQ %d to legacy " |
| "IRQ: unknown mapping\n", entry->index); |
| return -1; |
| } |
| } |
| } |
| #endif /* CONFIG_X86_IO_APIC */ |
| |
| static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin) |
| { |
| struct acpi_prt_entry *entry = NULL; |
| struct pci_dev *bridge; |
| u8 bridge_pin, orig_pin = pin; |
| int ret; |
| |
| ret = acpi_pci_irq_find_prt_entry(dev, pin, &entry); |
| if (!ret && entry) { |
| #ifdef CONFIG_X86_IO_APIC |
| acpi_reroute_boot_interrupt(dev, entry); |
| #endif /* CONFIG_X86_IO_APIC */ |
| 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; |
| } |
| |
| ret = acpi_pci_irq_find_prt_entry(bridge, pin, &entry); |
| if (!ret && 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; |
| /* Interrupt Line values above 0xF are forbidden */ |
| if (dev->irq > 0 && (dev->irq <= 0xF) && |
| (acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) { |
| dev_warn(&dev->dev, "PCI INT %c: no GSI - using ISA IRQ %d\n", |
| pin_name(pin), dev->irq); |
| acpi_register_gsi(&dev->dev, dev_gsi, |
| ACPI_LEVEL_SENSITIVE, |
| ACPI_ACTIVE_LOW); |
| } else { |
| dev_warn(&dev->dev, "PCI INT %c: no GSI\n", |
| pin_name(pin)); |
| } |
| |
| kfree(entry); |
| 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)); |
| kfree(entry); |
| return rc; |
| } |
| dev->irq = rc; |
| |
| if (link) |
| snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link); |
| else |
| link_desc[0] = '\0'; |
| |
| dev_dbg(&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); |
| |
| kfree(entry); |
| return 0; |
| } |
| |
| 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; |
| |
| kfree(entry); |
| |
| /* |
| * 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); |
| } |