/* * 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 * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * 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 _COMPONENT ACPI_PCI_COMPONENT ACPI_MODULE_NAME("pci_irq"); struct acpi_prt_entry { struct list_head node; struct acpi_pci_id id; u8 pin; struct { acpi_handle handle; u32 index; } link; u32 irq; }; struct acpi_prt_list { int count; struct list_head entries; }; static struct acpi_prt_list acpi_prt; 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(int segment, int bus, int device, int pin) { struct acpi_prt_entry *entry = NULL; if (!acpi_prt.count) return NULL; /* * Parse through all PRT entries looking for a match on the specified * PCI device's segment, bus, device, and pin (don't care about func). * */ spin_lock(&acpi_prt_lock); list_for_each_entry(entry, &acpi_prt.entries, node) { 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 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 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 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 { struct dmi_system_id *system; unsigned int segment; unsigned int bus; unsigned int device; unsigned char pin; char *source; /* according to BIOS */ char *actual_source; }; /* * 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 struct prt_quirk prt_quirks[] = { { medion_md9580, 0, 0, 9, 'A', "\\_SB_.PCI0.ISA_.LNKA", "\\_SB_.PCI0.ISA_.LNKB"}, { dell_optiplex, 0, 0, 0xd, 'A', "\\_SB_.LNKB", "\\_SB_.LNKA"}, { hp_t5710, 0, 0, 1, '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; 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 && pin_name(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, int segment, int bus, struct acpi_pci_routing_table *prt) { struct acpi_prt_entry *entry = NULL; 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); /* * 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.handle); entry->link.index = prt->source_index; } /* * 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. */ else entry->link.index = prt->source_index; 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->link.index)); spin_lock(&acpi_prt_lock); list_add_tail(&entry->node, &acpi_prt.entries); acpi_prt.count++; spin_unlock(&acpi_prt_lock); return 0; } static void acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry) { if (segment == entry->id.segment && bus == entry->id.bus) { acpi_prt.count--; list_del(&entry->node); kfree(entry); } } int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus) { acpi_status status; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; struct acpi_pci_routing_table *entry; static int first_time = 1; if (first_time) { acpi_prt.count = 0; INIT_LIST_HEAD(&acpi_prt.entries); first_time = 0; } /* '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, segment, bus, entry); entry = (struct acpi_pci_routing_table *) ((unsigned long)entry + entry->length); } kfree(buffer.pointer); return 0; } void acpi_pci_irq_del_prt(int segment, int bus) { struct list_head *node = NULL, *n = NULL; struct acpi_prt_entry *entry = NULL; if (!acpi_prt.count) { return; } printk(KERN_DEBUG "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n", segment, bus); spin_lock(&acpi_prt_lock); list_for_each_safe(node, n, &acpi_prt.entries) { entry = list_entry(node, struct acpi_prt_entry, node); acpi_pci_irq_del_entry(segment, bus, entry); } spin_unlock(&acpi_prt_lock); } /* -------------------------------------------------------------------------- PCI Interrupt Routing Support -------------------------------------------------------------------------- */ typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **); static int acpi_pci_allocate_irq(struct acpi_prt_entry *entry, int *triggering, int *polarity, char **link) { int irq; if (entry->link.handle) { irq = acpi_pci_link_allocate_irq(entry->link.handle, entry->link.index, triggering, polarity, link); if (irq < 0) { printk(KERN_WARNING PREFIX "Invalid IRQ link routing entry\n"); return -1; } } else { irq = entry->link.index; *triggering = ACPI_LEVEL_SENSITIVE; *polarity = ACPI_ACTIVE_LOW; } ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found GSI %d\n", irq)); return irq; } static int acpi_pci_free_irq(struct acpi_prt_entry *entry, int *triggering, int *polarity, char **link) { int irq; if (entry->link.handle) { irq = acpi_pci_link_free_irq(entry->link.handle); } else { irq = entry->link.index; } return irq; } /* * acpi_pci_irq_lookup * success: return IRQ >= 0 * failure: return -1 */ static int acpi_pci_irq_lookup(struct pci_bus *bus, int device, int pin, int *triggering, int *polarity, char **link, irq_lookup_func func) { struct acpi_prt_entry *entry = NULL; int segment = pci_domain_nr(bus); int bus_nr = bus->number; int ret; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Searching for _PRT entry for %04x:%02x:%02x[%c]\n", segment, bus_nr, device, pin_name(pin))); entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin); if (!entry) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_PRT entry not found\n")); return -1; } ret = func(entry, triggering, polarity, link); return ret; } /* * acpi_pci_irq_derive * success: return IRQ >= 0 * failure: return < 0 */ static int acpi_pci_irq_derive(struct pci_dev *dev, int pin, int *triggering, int *polarity, char **link, irq_lookup_func func) { struct pci_dev *bridge = dev; int irq = -1; u8 bridge_pin = 0, orig_pin = pin; /* * 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). */ while (irq < 0 && bridge->bus->self) { pin = (((pin - 1) + PCI_SLOT(bridge->devfn)) % 4) + 1; bridge = bridge->bus->self; 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 -1; } pin = bridge_pin; } irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn), pin, triggering, polarity, link, func); } if (irq < 0) { dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n", pin_name(orig_pin)); return -1; } ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive GSI %d for device %s from %s\n", irq, pci_name(dev), pci_name(bridge))); return irq; } /* * acpi_pci_irq_enable * success: return 0 * failure: return < 0 */ int acpi_pci_irq_enable(struct pci_dev *dev) { int gsi = 0; u8 pin = 0; 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; } /* * First we check the PCI IRQ routing table (PRT) for an IRQ. PRT * values override any BIOS-assigned IRQs set during boot. */ gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin, &triggering, &polarity, &link, acpi_pci_allocate_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, &link, acpi_pci_allocate_irq); if (gsi < 0) { /* * 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; } /* * 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->bus, PCI_SLOT(dev->devfn), 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); }