2 * pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $)
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * Copyright (C) 2002 Dominik Brodowski <devel@brodo.de>
7 * (c) Copyright 2008 Hewlett-Packard Development Company, L.P.
8 * Bjorn Helgaas <bjorn.helgaas@hp.com>
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or (at
15 * your option) any later version.
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write to the Free Software Foundation, Inc.,
24 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
30 #include <linux/dmi.h>
31 #include <linux/kernel.h>
32 #include <linux/module.h>
33 #include <linux/init.h>
34 #include <linux/types.h>
35 #include <linux/spinlock.h>
37 #include <linux/pci.h>
38 #include <linux/acpi.h>
39 #include <linux/slab.h>
40 #include <acpi/acpi_bus.h>
41 #include <acpi/acpi_drivers.h>
43 #define PREFIX "ACPI: "
45 #define _COMPONENT ACPI_PCI_COMPONENT
46 ACPI_MODULE_NAME("pci_irq");
48 struct acpi_prt_entry {
49 struct list_head list;
50 struct acpi_pci_id id;
53 u32 index; /* GSI, or link _CRS index */
56 static LIST_HEAD(acpi_prt_list);
57 static DEFINE_SPINLOCK(acpi_prt_lock);
59 static inline char pin_name(int pin)
64 /* --------------------------------------------------------------------------
65 PCI IRQ Routing Table (PRT) Support
66 -------------------------------------------------------------------------- */
68 static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
71 struct acpi_prt_entry *entry;
72 int segment = pci_domain_nr(dev->bus);
73 int bus = dev->bus->number;
74 int device = PCI_SLOT(dev->devfn);
76 spin_lock(&acpi_prt_lock);
77 list_for_each_entry(entry, &acpi_prt_list, list) {
78 if ((segment == entry->id.segment)
79 && (bus == entry->id.bus)
80 && (device == entry->id.device)
81 && (pin == entry->pin)) {
82 spin_unlock(&acpi_prt_lock);
86 spin_unlock(&acpi_prt_lock);
90 /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
91 static const struct dmi_system_id medion_md9580[] = {
93 .ident = "Medion MD9580-F laptop",
95 DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
96 DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
102 /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
103 static const struct dmi_system_id dell_optiplex[] = {
105 .ident = "Dell Optiplex GX1",
107 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
108 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
114 /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
115 static const struct dmi_system_id hp_t5710[] = {
119 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
120 DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
121 DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
128 const struct dmi_system_id *system;
129 unsigned int segment;
133 const char *source; /* according to BIOS */
134 const char *actual_source;
137 #define PCI_INTX_PIN(c) (c - 'A' + 1)
140 * These systems have incorrect _PRT entries. The BIOS claims the PCI
141 * interrupt at the listed segment/bus/device/pin is connected to the first
142 * link device, but it is actually connected to the second.
144 static const struct prt_quirk prt_quirks[] = {
145 { medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
146 "\\_SB_.PCI0.ISA_.LNKA",
147 "\\_SB_.PCI0.ISA_.LNKB"},
148 { dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
151 { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
156 static void do_prt_fixups(struct acpi_prt_entry *entry,
157 struct acpi_pci_routing_table *prt)
160 const struct prt_quirk *quirk;
162 for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
163 quirk = &prt_quirks[i];
165 /* All current quirks involve link devices, not GSIs */
169 if (dmi_check_system(quirk->system) &&
170 entry->id.segment == quirk->segment &&
171 entry->id.bus == quirk->bus &&
172 entry->id.device == quirk->device &&
173 entry->pin == quirk->pin &&
174 !strcmp(prt->source, quirk->source) &&
175 strlen(prt->source) >= strlen(quirk->actual_source)) {
176 printk(KERN_WARNING PREFIX "firmware reports "
177 "%04x:%02x:%02x PCI INT %c connected to %s; "
179 entry->id.segment, entry->id.bus,
180 entry->id.device, pin_name(entry->pin),
181 prt->source, quirk->actual_source);
182 strcpy(prt->source, quirk->actual_source);
187 static int acpi_pci_irq_add_entry(acpi_handle handle, int segment, int bus,
188 struct acpi_pci_routing_table *prt)
190 struct acpi_prt_entry *entry;
192 entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
197 * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses
198 * 1=INTA, 2=INTB. We use the PCI encoding throughout, so convert
201 entry->id.segment = segment;
203 entry->id.device = (prt->address >> 16) & 0xFFFF;
204 entry->pin = prt->pin + 1;
206 do_prt_fixups(entry, prt);
208 entry->index = prt->source_index;
213 * The 'source' field specifies the PCI interrupt link device used to
214 * configure the IRQ assigned to this slot|dev|pin. The 'source_index'
215 * indicates which resource descriptor in the resource template (of
216 * the link device) this interrupt is allocated from.
218 * NOTE: Don't query the Link Device for IRQ information at this time
219 * because Link Device enumeration may not have occurred yet
220 * (e.g. exists somewhere 'below' this _PRT entry in the ACPI
224 acpi_get_handle(handle, prt->source, &entry->link);
229 * The 'source' field is NULL, and the 'source_index' field specifies
230 * the IRQ value, which is hardwired to specific interrupt inputs on
231 * the interrupt controller.
234 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
235 " %04x:%02x:%02x[%c] -> %s[%d]\n",
236 entry->id.segment, entry->id.bus,
237 entry->id.device, pin_name(entry->pin),
238 prt->source, entry->index));
240 spin_lock(&acpi_prt_lock);
241 list_add_tail(&entry->list, &acpi_prt_list);
242 spin_unlock(&acpi_prt_lock);
247 int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
250 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
251 struct acpi_pci_routing_table *entry;
253 /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
254 status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
255 if (ACPI_FAILURE(status))
258 printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
259 (char *) buffer.pointer);
261 kfree(buffer.pointer);
263 buffer.length = ACPI_ALLOCATE_BUFFER;
264 buffer.pointer = NULL;
266 status = acpi_get_irq_routing_table(handle, &buffer);
267 if (ACPI_FAILURE(status)) {
268 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
269 acpi_format_exception(status)));
270 kfree(buffer.pointer);
274 entry = buffer.pointer;
275 while (entry && (entry->length > 0)) {
276 acpi_pci_irq_add_entry(handle, segment, bus, entry);
277 entry = (struct acpi_pci_routing_table *)
278 ((unsigned long)entry + entry->length);
281 kfree(buffer.pointer);
285 void acpi_pci_irq_del_prt(int segment, int bus)
287 struct acpi_prt_entry *entry, *tmp;
290 "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
292 spin_lock(&acpi_prt_lock);
293 list_for_each_entry_safe(entry, tmp, &acpi_prt_list, list) {
294 if (segment == entry->id.segment && bus == entry->id.bus) {
295 list_del(&entry->list);
299 spin_unlock(&acpi_prt_lock);
302 /* --------------------------------------------------------------------------
303 PCI Interrupt Routing Support
304 -------------------------------------------------------------------------- */
305 #ifdef CONFIG_X86_IO_APIC
306 extern int noioapicquirk;
307 extern int noioapicreroute;
309 static int bridge_has_boot_interrupt_variant(struct pci_bus *bus)
311 struct pci_bus *bus_it;
313 for (bus_it = bus ; bus_it ; bus_it = bus_it->parent) {
316 if (bus_it->self->irq_reroute_variant)
317 return bus_it->self->irq_reroute_variant;
323 * Some chipsets (e.g. Intel 6700PXH) generate a legacy INTx when the IRQ
324 * entry in the chipset's IO-APIC is masked (as, e.g. the RT kernel does
325 * during interrupt handling). When this INTx generation cannot be disabled,
326 * we reroute these interrupts to their legacy equivalent to get rid of
327 * spurious interrupts.
329 static int acpi_reroute_boot_interrupt(struct pci_dev *dev,
330 struct acpi_prt_entry *entry)
332 if (noioapicquirk || noioapicreroute) {
335 switch (bridge_has_boot_interrupt_variant(dev->bus)) {
337 /* no rerouting necessary */
339 case INTEL_IRQ_REROUTE_VARIANT:
341 * Remap according to INTx routing table in 6700PXH
342 * specs, intel order number 302628-002, section
343 * 2.15.2. Other chipsets (80332, ...) have the same
344 * mapping and are handled here as well.
346 dev_info(&dev->dev, "PCI IRQ %d -> rerouted to legacy "
347 "IRQ %d\n", entry->index,
348 (entry->index % 4) + 16);
349 entry->index = (entry->index % 4) + 16;
352 dev_warn(&dev->dev, "Cannot reroute IRQ %d to legacy "
353 "IRQ: unknown mapping\n", entry->index);
358 #endif /* CONFIG_X86_IO_APIC */
360 static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
362 struct acpi_prt_entry *entry;
363 struct pci_dev *bridge;
364 u8 bridge_pin, orig_pin = pin;
366 entry = acpi_pci_irq_find_prt_entry(dev, pin);
368 #ifdef CONFIG_X86_IO_APIC
369 acpi_reroute_boot_interrupt(dev, entry);
370 #endif /* CONFIG_X86_IO_APIC */
371 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
372 pci_name(dev), pin_name(pin)));
377 * Attempt to derive an IRQ for this device from a parent bridge's
378 * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
380 bridge = dev->bus->self;
382 pin = pci_swizzle_interrupt_pin(dev, pin);
384 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
385 /* PC card has the same IRQ as its cardbridge */
386 bridge_pin = bridge->pin;
388 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
389 "No interrupt pin configured for device %s\n",
396 entry = acpi_pci_irq_find_prt_entry(bridge, pin);
398 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
399 "Derived GSI for %s INT %c from %s\n",
400 pci_name(dev), pin_name(orig_pin),
406 bridge = dev->bus->self;
409 dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
414 int acpi_pci_irq_enable(struct pci_dev *dev)
416 struct acpi_prt_entry *entry;
419 int triggering = ACPI_LEVEL_SENSITIVE;
420 int polarity = ACPI_ACTIVE_LOW;
427 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
428 "No interrupt pin configured for device %s\n",
433 entry = acpi_pci_irq_lookup(dev, pin);
436 * IDE legacy mode controller IRQs are magic. Why do compat
437 * extensions always make such a nasty mess.
439 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
440 (dev->class & 0x05) == 0)
446 gsi = acpi_pci_link_allocate_irq(entry->link,
448 &triggering, &polarity,
456 * No IRQ known to the ACPI subsystem - maybe the BIOS /
457 * driver reported one, then use it. Exit in any case.
461 /* Interrupt Line values above 0xF are forbidden */
462 if (dev->irq > 0 && (dev->irq <= 0xF) &&
463 (acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) {
464 dev_warn(&dev->dev, "PCI INT %c: no GSI - using ISA IRQ %d\n",
465 pin_name(pin), dev->irq);
466 acpi_register_gsi(&dev->dev, dev_gsi,
467 ACPI_LEVEL_SENSITIVE,
470 dev_warn(&dev->dev, "PCI INT %c: no GSI\n",
476 rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity);
478 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
485 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
489 dev_dbg(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
490 pin_name(pin), link_desc, gsi,
491 (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
492 (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
497 void acpi_pci_irq_disable(struct pci_dev *dev)
499 struct acpi_prt_entry *entry;
507 entry = acpi_pci_irq_lookup(dev, pin);
512 gsi = acpi_pci_link_free_irq(entry->link);
517 * TBD: It might be worth clearing dev->irq by magic constant
518 * (e.g. PCI_UNDEFINED_IRQ).
521 dev_dbg(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
522 acpi_unregister_gsi(gsi);