/* * pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $) * * Copyright (C) 2001, 2002 Andy Grover * Copyright (C) 2001, 2002 Paul Diefenbaugh * Copyright (C) 2002 Dominik Brodowski * (c) Copyright 2008 Hewlett-Packard Development Company, L.P. * Bjorn Helgaas * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * 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 #include #include #include #include #include #include #include #include #include #include #include #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 -------------------------------------------------------------------------- */ #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; struct pci_dev *bridge; u8 bridge_pin, orig_pin = pin; entry = acpi_pci_irq_find_prt_entry(dev, pin); if (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; } 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_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); 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); }