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1 | /* | |
2 | * pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $) | |
3 | * | |
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> | |
9 | * | |
10 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
11 | * | |
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. | |
16 | * | |
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. | |
21 | * | |
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. | |
25 | * | |
26 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
27 | */ | |
28 | ||
29 | ||
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> | |
36 | #include <linux/pm.h> | |
37 | #include <linux/pci.h> | |
38 | #include <linux/acpi.h> | |
39 | #include <linux/slab.h> | |
40 | ||
41 | #define PREFIX "ACPI: " | |
42 | ||
43 | #define _COMPONENT ACPI_PCI_COMPONENT | |
44 | ACPI_MODULE_NAME("pci_irq"); | |
45 | ||
46 | struct acpi_prt_entry { | |
47 | struct list_head list; | |
48 | struct acpi_pci_id id; | |
49 | u8 pin; | |
50 | acpi_handle link; | |
51 | u32 index; /* GSI, or link _CRS index */ | |
52 | }; | |
53 | ||
54 | static inline char pin_name(int pin) | |
55 | { | |
56 | return 'A' + pin - 1; | |
57 | } | |
58 | ||
59 | /* -------------------------------------------------------------------------- | |
60 | PCI IRQ Routing Table (PRT) Support | |
61 | -------------------------------------------------------------------------- */ | |
62 | ||
63 | /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */ | |
64 | static const struct dmi_system_id medion_md9580[] = { | |
65 | { | |
66 | .ident = "Medion MD9580-F laptop", | |
67 | .matches = { | |
68 | DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"), | |
69 | DMI_MATCH(DMI_PRODUCT_NAME, "A555"), | |
70 | }, | |
71 | }, | |
72 | { } | |
73 | }; | |
74 | ||
75 | /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */ | |
76 | static const struct dmi_system_id dell_optiplex[] = { | |
77 | { | |
78 | .ident = "Dell Optiplex GX1", | |
79 | .matches = { | |
80 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
81 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"), | |
82 | }, | |
83 | }, | |
84 | { } | |
85 | }; | |
86 | ||
87 | /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */ | |
88 | static const struct dmi_system_id hp_t5710[] = { | |
89 | { | |
90 | .ident = "HP t5710", | |
91 | .matches = { | |
92 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
93 | DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"), | |
94 | DMI_MATCH(DMI_BOARD_NAME, "098Ch"), | |
95 | }, | |
96 | }, | |
97 | { } | |
98 | }; | |
99 | ||
100 | struct prt_quirk { | |
101 | const struct dmi_system_id *system; | |
102 | unsigned int segment; | |
103 | unsigned int bus; | |
104 | unsigned int device; | |
105 | unsigned char pin; | |
106 | const char *source; /* according to BIOS */ | |
107 | const char *actual_source; | |
108 | }; | |
109 | ||
110 | #define PCI_INTX_PIN(c) (c - 'A' + 1) | |
111 | ||
112 | /* | |
113 | * These systems have incorrect _PRT entries. The BIOS claims the PCI | |
114 | * interrupt at the listed segment/bus/device/pin is connected to the first | |
115 | * link device, but it is actually connected to the second. | |
116 | */ | |
117 | static const struct prt_quirk prt_quirks[] = { | |
118 | { medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'), | |
119 | "\\_SB_.PCI0.ISA_.LNKA", | |
120 | "\\_SB_.PCI0.ISA_.LNKB"}, | |
121 | { dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'), | |
122 | "\\_SB_.LNKB", | |
123 | "\\_SB_.LNKA"}, | |
124 | { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'), | |
125 | "\\_SB_.PCI0.LNK1", | |
126 | "\\_SB_.PCI0.LNK3"}, | |
127 | }; | |
128 | ||
129 | static void do_prt_fixups(struct acpi_prt_entry *entry, | |
130 | struct acpi_pci_routing_table *prt) | |
131 | { | |
132 | int i; | |
133 | const struct prt_quirk *quirk; | |
134 | ||
135 | for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) { | |
136 | quirk = &prt_quirks[i]; | |
137 | ||
138 | /* All current quirks involve link devices, not GSIs */ | |
139 | if (!prt->source) | |
140 | continue; | |
141 | ||
142 | if (dmi_check_system(quirk->system) && | |
143 | entry->id.segment == quirk->segment && | |
144 | entry->id.bus == quirk->bus && | |
145 | entry->id.device == quirk->device && | |
146 | entry->pin == quirk->pin && | |
147 | !strcmp(prt->source, quirk->source) && | |
148 | strlen(prt->source) >= strlen(quirk->actual_source)) { | |
149 | printk(KERN_WARNING PREFIX "firmware reports " | |
150 | "%04x:%02x:%02x PCI INT %c connected to %s; " | |
151 | "changing to %s\n", | |
152 | entry->id.segment, entry->id.bus, | |
153 | entry->id.device, pin_name(entry->pin), | |
154 | prt->source, quirk->actual_source); | |
155 | strcpy(prt->source, quirk->actual_source); | |
156 | } | |
157 | } | |
158 | } | |
159 | ||
160 | static int acpi_pci_irq_check_entry(acpi_handle handle, struct pci_dev *dev, | |
161 | int pin, struct acpi_pci_routing_table *prt, | |
162 | struct acpi_prt_entry **entry_ptr) | |
163 | { | |
164 | int segment = pci_domain_nr(dev->bus); | |
165 | int bus = dev->bus->number; | |
166 | int device = PCI_SLOT(dev->devfn); | |
167 | struct acpi_prt_entry *entry; | |
168 | ||
169 | if (((prt->address >> 16) & 0xffff) != device || | |
170 | prt->pin + 1 != pin) | |
171 | return -ENODEV; | |
172 | ||
173 | entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL); | |
174 | if (!entry) | |
175 | return -ENOMEM; | |
176 | ||
177 | /* | |
178 | * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses | |
179 | * 1=INTA, 2=INTB. We use the PCI encoding throughout, so convert | |
180 | * it here. | |
181 | */ | |
182 | entry->id.segment = segment; | |
183 | entry->id.bus = bus; | |
184 | entry->id.device = (prt->address >> 16) & 0xFFFF; | |
185 | entry->pin = prt->pin + 1; | |
186 | ||
187 | do_prt_fixups(entry, prt); | |
188 | ||
189 | entry->index = prt->source_index; | |
190 | ||
191 | /* | |
192 | * Type 1: Dynamic | |
193 | * --------------- | |
194 | * The 'source' field specifies the PCI interrupt link device used to | |
195 | * configure the IRQ assigned to this slot|dev|pin. The 'source_index' | |
196 | * indicates which resource descriptor in the resource template (of | |
197 | * the link device) this interrupt is allocated from. | |
198 | * | |
199 | * NOTE: Don't query the Link Device for IRQ information at this time | |
200 | * because Link Device enumeration may not have occurred yet | |
201 | * (e.g. exists somewhere 'below' this _PRT entry in the ACPI | |
202 | * namespace). | |
203 | */ | |
204 | if (prt->source[0]) | |
205 | acpi_get_handle(handle, prt->source, &entry->link); | |
206 | ||
207 | /* | |
208 | * Type 2: Static | |
209 | * -------------- | |
210 | * The 'source' field is NULL, and the 'source_index' field specifies | |
211 | * the IRQ value, which is hardwired to specific interrupt inputs on | |
212 | * the interrupt controller. | |
213 | */ | |
214 | ||
215 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO, | |
216 | " %04x:%02x:%02x[%c] -> %s[%d]\n", | |
217 | entry->id.segment, entry->id.bus, | |
218 | entry->id.device, pin_name(entry->pin), | |
219 | prt->source, entry->index)); | |
220 | ||
221 | *entry_ptr = entry; | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | static int acpi_pci_irq_find_prt_entry(struct pci_dev *dev, | |
227 | int pin, struct acpi_prt_entry **entry_ptr) | |
228 | { | |
229 | acpi_status status; | |
230 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
231 | struct acpi_pci_routing_table *entry; | |
232 | acpi_handle handle = NULL; | |
233 | ||
234 | if (dev->bus->bridge) | |
235 | handle = ACPI_HANDLE(dev->bus->bridge); | |
236 | ||
237 | if (!handle) | |
238 | return -ENODEV; | |
239 | ||
240 | /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */ | |
241 | status = acpi_get_irq_routing_table(handle, &buffer); | |
242 | if (ACPI_FAILURE(status)) { | |
243 | kfree(buffer.pointer); | |
244 | return -ENODEV; | |
245 | } | |
246 | ||
247 | entry = buffer.pointer; | |
248 | while (entry && (entry->length > 0)) { | |
249 | if (!acpi_pci_irq_check_entry(handle, dev, pin, | |
250 | entry, entry_ptr)) | |
251 | break; | |
252 | entry = (struct acpi_pci_routing_table *) | |
253 | ((unsigned long)entry + entry->length); | |
254 | } | |
255 | ||
256 | kfree(buffer.pointer); | |
257 | return 0; | |
258 | } | |
259 | ||
260 | /* -------------------------------------------------------------------------- | |
261 | PCI Interrupt Routing Support | |
262 | -------------------------------------------------------------------------- */ | |
263 | #ifdef CONFIG_X86_IO_APIC | |
264 | extern int noioapicquirk; | |
265 | extern int noioapicreroute; | |
266 | ||
267 | static int bridge_has_boot_interrupt_variant(struct pci_bus *bus) | |
268 | { | |
269 | struct pci_bus *bus_it; | |
270 | ||
271 | for (bus_it = bus ; bus_it ; bus_it = bus_it->parent) { | |
272 | if (!bus_it->self) | |
273 | return 0; | |
274 | if (bus_it->self->irq_reroute_variant) | |
275 | return bus_it->self->irq_reroute_variant; | |
276 | } | |
277 | return 0; | |
278 | } | |
279 | ||
280 | /* | |
281 | * Some chipsets (e.g. Intel 6700PXH) generate a legacy INTx when the IRQ | |
282 | * entry in the chipset's IO-APIC is masked (as, e.g. the RT kernel does | |
283 | * during interrupt handling). When this INTx generation cannot be disabled, | |
284 | * we reroute these interrupts to their legacy equivalent to get rid of | |
285 | * spurious interrupts. | |
286 | */ | |
287 | static int acpi_reroute_boot_interrupt(struct pci_dev *dev, | |
288 | struct acpi_prt_entry *entry) | |
289 | { | |
290 | if (noioapicquirk || noioapicreroute) { | |
291 | return 0; | |
292 | } else { | |
293 | switch (bridge_has_boot_interrupt_variant(dev->bus)) { | |
294 | case 0: | |
295 | /* no rerouting necessary */ | |
296 | return 0; | |
297 | case INTEL_IRQ_REROUTE_VARIANT: | |
298 | /* | |
299 | * Remap according to INTx routing table in 6700PXH | |
300 | * specs, intel order number 302628-002, section | |
301 | * 2.15.2. Other chipsets (80332, ...) have the same | |
302 | * mapping and are handled here as well. | |
303 | */ | |
304 | dev_info(&dev->dev, "PCI IRQ %d -> rerouted to legacy " | |
305 | "IRQ %d\n", entry->index, | |
306 | (entry->index % 4) + 16); | |
307 | entry->index = (entry->index % 4) + 16; | |
308 | return 1; | |
309 | default: | |
310 | dev_warn(&dev->dev, "Cannot reroute IRQ %d to legacy " | |
311 | "IRQ: unknown mapping\n", entry->index); | |
312 | return -1; | |
313 | } | |
314 | } | |
315 | } | |
316 | #endif /* CONFIG_X86_IO_APIC */ | |
317 | ||
318 | static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin) | |
319 | { | |
320 | struct acpi_prt_entry *entry = NULL; | |
321 | struct pci_dev *bridge; | |
322 | u8 bridge_pin, orig_pin = pin; | |
323 | int ret; | |
324 | ||
325 | ret = acpi_pci_irq_find_prt_entry(dev, pin, &entry); | |
326 | if (!ret && entry) { | |
327 | #ifdef CONFIG_X86_IO_APIC | |
328 | acpi_reroute_boot_interrupt(dev, entry); | |
329 | #endif /* CONFIG_X86_IO_APIC */ | |
330 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n", | |
331 | pci_name(dev), pin_name(pin))); | |
332 | return entry; | |
333 | } | |
334 | ||
335 | /* | |
336 | * Attempt to derive an IRQ for this device from a parent bridge's | |
337 | * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge). | |
338 | */ | |
339 | bridge = dev->bus->self; | |
340 | while (bridge) { | |
341 | pin = pci_swizzle_interrupt_pin(dev, pin); | |
342 | ||
343 | if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) { | |
344 | /* PC card has the same IRQ as its cardbridge */ | |
345 | bridge_pin = bridge->pin; | |
346 | if (!bridge_pin) { | |
347 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
348 | "No interrupt pin configured for device %s\n", | |
349 | pci_name(bridge))); | |
350 | return NULL; | |
351 | } | |
352 | pin = bridge_pin; | |
353 | } | |
354 | ||
355 | ret = acpi_pci_irq_find_prt_entry(bridge, pin, &entry); | |
356 | if (!ret && entry) { | |
357 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
358 | "Derived GSI for %s INT %c from %s\n", | |
359 | pci_name(dev), pin_name(orig_pin), | |
360 | pci_name(bridge))); | |
361 | return entry; | |
362 | } | |
363 | ||
364 | dev = bridge; | |
365 | bridge = dev->bus->self; | |
366 | } | |
367 | ||
368 | dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n", | |
369 | pin_name(orig_pin)); | |
370 | return NULL; | |
371 | } | |
372 | ||
373 | int acpi_pci_irq_enable(struct pci_dev *dev) | |
374 | { | |
375 | struct acpi_prt_entry *entry; | |
376 | int gsi; | |
377 | u8 pin; | |
378 | int triggering = ACPI_LEVEL_SENSITIVE; | |
379 | int polarity = ACPI_ACTIVE_LOW; | |
380 | char *link = NULL; | |
381 | char link_desc[16]; | |
382 | int rc; | |
383 | ||
384 | pin = dev->pin; | |
385 | if (!pin) { | |
386 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
387 | "No interrupt pin configured for device %s\n", | |
388 | pci_name(dev))); | |
389 | return 0; | |
390 | } | |
391 | ||
392 | entry = acpi_pci_irq_lookup(dev, pin); | |
393 | if (!entry) { | |
394 | /* | |
395 | * IDE legacy mode controller IRQs are magic. Why do compat | |
396 | * extensions always make such a nasty mess. | |
397 | */ | |
398 | if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE && | |
399 | (dev->class & 0x05) == 0) | |
400 | return 0; | |
401 | } | |
402 | ||
403 | if (entry) { | |
404 | if (entry->link) | |
405 | gsi = acpi_pci_link_allocate_irq(entry->link, | |
406 | entry->index, | |
407 | &triggering, &polarity, | |
408 | &link); | |
409 | else | |
410 | gsi = entry->index; | |
411 | } else | |
412 | gsi = -1; | |
413 | ||
414 | /* | |
415 | * No IRQ known to the ACPI subsystem - maybe the BIOS / | |
416 | * driver reported one, then use it. Exit in any case. | |
417 | */ | |
418 | if (gsi < 0) { | |
419 | u32 dev_gsi; | |
420 | /* Interrupt Line values above 0xF are forbidden */ | |
421 | if (dev->irq > 0 && (dev->irq <= 0xF) && | |
422 | (acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) { | |
423 | dev_warn(&dev->dev, "PCI INT %c: no GSI - using ISA IRQ %d\n", | |
424 | pin_name(pin), dev->irq); | |
425 | acpi_register_gsi(&dev->dev, dev_gsi, | |
426 | ACPI_LEVEL_SENSITIVE, | |
427 | ACPI_ACTIVE_LOW); | |
428 | } else { | |
429 | dev_warn(&dev->dev, "PCI INT %c: no GSI\n", | |
430 | pin_name(pin)); | |
431 | } | |
432 | ||
433 | kfree(entry); | |
434 | return 0; | |
435 | } | |
436 | ||
437 | rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity); | |
438 | if (rc < 0) { | |
439 | dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n", | |
440 | pin_name(pin)); | |
441 | kfree(entry); | |
442 | return rc; | |
443 | } | |
444 | dev->irq = rc; | |
445 | ||
446 | if (link) | |
447 | snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link); | |
448 | else | |
449 | link_desc[0] = '\0'; | |
450 | ||
451 | dev_dbg(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n", | |
452 | pin_name(pin), link_desc, gsi, | |
453 | (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge", | |
454 | (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq); | |
455 | ||
456 | kfree(entry); | |
457 | return 0; | |
458 | } | |
459 | ||
460 | void acpi_pci_irq_disable(struct pci_dev *dev) | |
461 | { | |
462 | struct acpi_prt_entry *entry; | |
463 | int gsi; | |
464 | u8 pin; | |
465 | ||
466 | pin = dev->pin; | |
467 | if (!pin) | |
468 | return; | |
469 | ||
470 | entry = acpi_pci_irq_lookup(dev, pin); | |
471 | if (!entry) | |
472 | return; | |
473 | ||
474 | if (entry->link) | |
475 | gsi = acpi_pci_link_free_irq(entry->link); | |
476 | else | |
477 | gsi = entry->index; | |
478 | ||
479 | kfree(entry); | |
480 | ||
481 | /* | |
482 | * TBD: It might be worth clearing dev->irq by magic constant | |
483 | * (e.g. PCI_UNDEFINED_IRQ). | |
484 | */ | |
485 | ||
486 | dev_dbg(&dev->dev, "PCI INT %c disabled\n", pin_name(pin)); | |
487 | acpi_unregister_gsi(gsi); | |
488 | } |