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 #include <acpi/acpi_bus.h>
41 #include <acpi/acpi_drivers.h>
42
43 #define PREFIX "ACPI: "
44
45 #define _COMPONENT ACPI_PCI_COMPONENT
46 ACPI_MODULE_NAME("pci_irq");
47
48 struct acpi_prt_entry {
49 struct list_head list;
50 struct acpi_pci_id id;
51 u8 pin;
52 acpi_handle link;
53 u32 index; /* GSI, or link _CRS index */
54 };
55
56 static LIST_HEAD(acpi_prt_list);
57 static DEFINE_SPINLOCK(acpi_prt_lock);
58
pin_name(int pin)59 static inline char pin_name(int pin)
60 {
61 return 'A' + pin - 1;
62 }
63
64 /* --------------------------------------------------------------------------
65 PCI IRQ Routing Table (PRT) Support
66 -------------------------------------------------------------------------- */
67
acpi_pci_irq_find_prt_entry(struct pci_dev * dev,int pin)68 static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
69 int pin)
70 {
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);
75
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);
83 return entry;
84 }
85 }
86 spin_unlock(&acpi_prt_lock);
87 return NULL;
88 }
89
90 /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
91 static const struct dmi_system_id medion_md9580[] = {
92 {
93 .ident = "Medion MD9580-F laptop",
94 .matches = {
95 DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
96 DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
97 },
98 },
99 { }
100 };
101
102 /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
103 static const struct dmi_system_id dell_optiplex[] = {
104 {
105 .ident = "Dell Optiplex GX1",
106 .matches = {
107 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
108 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
109 },
110 },
111 { }
112 };
113
114 /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
115 static const struct dmi_system_id hp_t5710[] = {
116 {
117 .ident = "HP t5710",
118 .matches = {
119 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
120 DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
121 DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
122 },
123 },
124 { }
125 };
126
127 struct prt_quirk {
128 const struct dmi_system_id *system;
129 unsigned int segment;
130 unsigned int bus;
131 unsigned int device;
132 unsigned char pin;
133 const char *source; /* according to BIOS */
134 const char *actual_source;
135 };
136
137 #define PCI_INTX_PIN(c) (c - 'A' + 1)
138
139 /*
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.
143 */
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'),
149 "\\_SB_.LNKB",
150 "\\_SB_.LNKA"},
151 { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
152 "\\_SB_.PCI0.LNK1",
153 "\\_SB_.PCI0.LNK3"},
154 };
155
do_prt_fixups(struct acpi_prt_entry * entry,struct acpi_pci_routing_table * prt)156 static void do_prt_fixups(struct acpi_prt_entry *entry,
157 struct acpi_pci_routing_table *prt)
158 {
159 int i;
160 const struct prt_quirk *quirk;
161
162 for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
163 quirk = &prt_quirks[i];
164
165 /* All current quirks involve link devices, not GSIs */
166 if (!prt->source)
167 continue;
168
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; "
178 "changing to %s\n",
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);
183 }
184 }
185 }
186
acpi_pci_irq_add_entry(acpi_handle handle,struct pci_bus * bus,struct acpi_pci_routing_table * prt)187 static int acpi_pci_irq_add_entry(acpi_handle handle, struct pci_bus *bus,
188 struct acpi_pci_routing_table *prt)
189 {
190 struct acpi_prt_entry *entry;
191
192 entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
193 if (!entry)
194 return -ENOMEM;
195
196 /*
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
199 * it here.
200 */
201 entry->id.segment = pci_domain_nr(bus);
202 entry->id.bus = bus->number;
203 entry->id.device = (prt->address >> 16) & 0xFFFF;
204 entry->pin = prt->pin + 1;
205
206 do_prt_fixups(entry, prt);
207
208 entry->index = prt->source_index;
209
210 /*
211 * Type 1: Dynamic
212 * ---------------
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.
217 *
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
221 * namespace).
222 */
223 if (prt->source[0])
224 acpi_get_handle(handle, prt->source, &entry->link);
225
226 /*
227 * Type 2: Static
228 * --------------
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.
232 */
233
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));
239
240 spin_lock(&acpi_prt_lock);
241 list_add_tail(&entry->list, &acpi_prt_list);
242 spin_unlock(&acpi_prt_lock);
243
244 return 0;
245 }
246
acpi_pci_irq_add_prt(acpi_handle handle,struct pci_bus * bus)247 int acpi_pci_irq_add_prt(acpi_handle handle, struct pci_bus *bus)
248 {
249 acpi_status status;
250 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
251 struct acpi_pci_routing_table *entry;
252
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))
256 return -ENODEV;
257
258 printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
259 (char *) buffer.pointer);
260
261 kfree(buffer.pointer);
262
263 buffer.length = ACPI_ALLOCATE_BUFFER;
264 buffer.pointer = NULL;
265
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);
271 return -ENODEV;
272 }
273
274 entry = buffer.pointer;
275 while (entry && (entry->length > 0)) {
276 acpi_pci_irq_add_entry(handle, bus, entry);
277 entry = (struct acpi_pci_routing_table *)
278 ((unsigned long)entry + entry->length);
279 }
280
281 kfree(buffer.pointer);
282 return 0;
283 }
284
acpi_pci_irq_del_prt(struct pci_bus * bus)285 void acpi_pci_irq_del_prt(struct pci_bus *bus)
286 {
287 struct acpi_prt_entry *entry, *tmp;
288
289 printk(KERN_DEBUG
290 "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
291 pci_domain_nr(bus), bus->number);
292 spin_lock(&acpi_prt_lock);
293 list_for_each_entry_safe(entry, tmp, &acpi_prt_list, list) {
294 if (pci_domain_nr(bus) == entry->id.segment
295 && bus->number == entry->id.bus) {
296 list_del(&entry->list);
297 kfree(entry);
298 }
299 }
300 spin_unlock(&acpi_prt_lock);
301 }
302
303 /* --------------------------------------------------------------------------
304 PCI Interrupt Routing Support
305 -------------------------------------------------------------------------- */
acpi_pci_irq_lookup(struct pci_dev * dev,int pin)306 static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
307 {
308 struct acpi_prt_entry *entry;
309 struct pci_dev *bridge;
310 u8 bridge_pin, orig_pin = pin;
311
312 entry = acpi_pci_irq_find_prt_entry(dev, pin);
313 if (entry) {
314 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
315 pci_name(dev), pin_name(pin)));
316 return entry;
317 }
318
319 /*
320 * Attempt to derive an IRQ for this device from a parent bridge's
321 * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
322 */
323 bridge = dev->bus->self;
324 while (bridge) {
325 pin = pci_swizzle_interrupt_pin(dev, pin);
326
327 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
328 /* PC card has the same IRQ as its cardbridge */
329 bridge_pin = bridge->pin;
330 if (!bridge_pin) {
331 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
332 "No interrupt pin configured for device %s\n",
333 pci_name(bridge)));
334 return NULL;
335 }
336 pin = bridge_pin;
337 }
338
339 entry = acpi_pci_irq_find_prt_entry(bridge, pin);
340 if (entry) {
341 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
342 "Derived GSI for %s INT %c from %s\n",
343 pci_name(dev), pin_name(orig_pin),
344 pci_name(bridge)));
345 return entry;
346 }
347
348 dev = bridge;
349 bridge = dev->bus->self;
350 }
351
352 dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
353 pin_name(orig_pin));
354 return NULL;
355 }
356
acpi_pci_irq_enable(struct pci_dev * dev)357 int acpi_pci_irq_enable(struct pci_dev *dev)
358 {
359 struct acpi_prt_entry *entry;
360 int gsi;
361 u8 pin;
362 int triggering = ACPI_LEVEL_SENSITIVE;
363 int polarity = ACPI_ACTIVE_LOW;
364 char *link = NULL;
365 char link_desc[16];
366 int rc;
367
368 pin = dev->pin;
369 if (!pin) {
370 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
371 "No interrupt pin configured for device %s\n",
372 pci_name(dev)));
373 return 0;
374 }
375
376 entry = acpi_pci_irq_lookup(dev, pin);
377 if (!entry) {
378 /*
379 * IDE legacy mode controller IRQs are magic. Why do compat
380 * extensions always make such a nasty mess.
381 */
382 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
383 (dev->class & 0x05) == 0)
384 return 0;
385 }
386
387 if (entry) {
388 if (entry->link)
389 gsi = acpi_pci_link_allocate_irq(entry->link,
390 entry->index,
391 &triggering, &polarity,
392 &link);
393 else
394 gsi = entry->index;
395 } else
396 gsi = -1;
397
398 /*
399 * No IRQ known to the ACPI subsystem - maybe the BIOS /
400 * driver reported one, then use it. Exit in any case.
401 */
402 if (gsi < 0) {
403 u32 dev_gsi;
404 dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin));
405 /* Interrupt Line values above 0xF are forbidden */
406 if (dev->irq > 0 && (dev->irq <= 0xF) &&
407 (acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) {
408 printk(" - using ISA IRQ %d\n", dev->irq);
409 acpi_register_gsi(&dev->dev, dev_gsi,
410 ACPI_LEVEL_SENSITIVE,
411 ACPI_ACTIVE_LOW);
412 return 0;
413 } else {
414 printk("\n");
415 return 0;
416 }
417 }
418
419 rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity);
420 if (rc < 0) {
421 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
422 pin_name(pin));
423 return rc;
424 }
425 dev->irq = rc;
426
427 if (link)
428 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
429 else
430 link_desc[0] = '\0';
431
432 dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
433 pin_name(pin), link_desc, gsi,
434 (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
435 (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
436
437 return 0;
438 }
439
440 /* FIXME: implement x86/x86_64 version */
acpi_unregister_gsi(u32 i)441 void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
442 {
443 }
444
acpi_pci_irq_disable(struct pci_dev * dev)445 void acpi_pci_irq_disable(struct pci_dev *dev)
446 {
447 struct acpi_prt_entry *entry;
448 int gsi;
449 u8 pin;
450
451 pin = dev->pin;
452 if (!pin)
453 return;
454
455 entry = acpi_pci_irq_lookup(dev, pin);
456 if (!entry)
457 return;
458
459 if (entry->link)
460 gsi = acpi_pci_link_free_irq(entry->link);
461 else
462 gsi = entry->index;
463
464 /*
465 * TBD: It might be worth clearing dev->irq by magic constant
466 * (e.g. PCI_UNDEFINED_IRQ).
467 */
468
469 dev_info(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
470 acpi_unregister_gsi(gsi);
471 }
472