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11
12#define pr_fmt(fmt) "ACPI: PCI: " fmt
13
14#include <linux/dmi.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/types.h>
19#include <linux/spinlock.h>
20#include <linux/pm.h>
21#include <linux/pci.h>
22#include <linux/acpi.h>
23#include <linux/slab.h>
24#include <linux/interrupt.h>
25
26struct acpi_prt_entry {
27 struct acpi_pci_id id;
28 u8 pin;
29 acpi_handle link;
30 u32 index;
31};
32
33static inline char pin_name(int pin)
34{
35 return 'A' + pin - 1;
36}
37
38
39
40
41
42
43static const struct dmi_system_id medion_md9580[] = {
44 {
45 .ident = "Medion MD9580-F laptop",
46 .matches = {
47 DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
48 DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
49 },
50 },
51 { }
52};
53
54
55static const struct dmi_system_id dell_optiplex[] = {
56 {
57 .ident = "Dell Optiplex GX1",
58 .matches = {
59 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
60 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
61 },
62 },
63 { }
64};
65
66
67static const struct dmi_system_id hp_t5710[] = {
68 {
69 .ident = "HP t5710",
70 .matches = {
71 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
72 DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
73 DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
74 },
75 },
76 { }
77};
78
79struct prt_quirk {
80 const struct dmi_system_id *system;
81 unsigned int segment;
82 unsigned int bus;
83 unsigned int device;
84 unsigned char pin;
85 const char *source;
86 const char *actual_source;
87};
88
89#define PCI_INTX_PIN(c) (c - 'A' + 1)
90
91
92
93
94
95
96static const struct prt_quirk prt_quirks[] = {
97 { medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
98 "\\_SB_.PCI0.ISA_.LNKA",
99 "\\_SB_.PCI0.ISA_.LNKB"},
100 { dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
101 "\\_SB_.LNKB",
102 "\\_SB_.LNKA"},
103 { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
104 "\\_SB_.PCI0.LNK1",
105 "\\_SB_.PCI0.LNK3"},
106};
107
108static void do_prt_fixups(struct acpi_prt_entry *entry,
109 struct acpi_pci_routing_table *prt)
110{
111 int i;
112 const struct prt_quirk *quirk;
113
114 for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
115 quirk = &prt_quirks[i];
116
117
118 if (dmi_check_system(quirk->system) &&
119 entry->id.segment == quirk->segment &&
120 entry->id.bus == quirk->bus &&
121 entry->id.device == quirk->device &&
122 entry->pin == quirk->pin &&
123 !strcmp(prt->source, quirk->source) &&
124 strlen(prt->source) >= strlen(quirk->actual_source)) {
125 pr_warn("Firmware reports "
126 "%04x:%02x:%02x PCI INT %c connected to %s; "
127 "changing to %s\n",
128 entry->id.segment, entry->id.bus,
129 entry->id.device, pin_name(entry->pin),
130 prt->source, quirk->actual_source);
131 strcpy(prt->source, quirk->actual_source);
132 }
133 }
134}
135
136static int acpi_pci_irq_check_entry(acpi_handle handle, struct pci_dev *dev,
137 int pin, struct acpi_pci_routing_table *prt,
138 struct acpi_prt_entry **entry_ptr)
139{
140 int segment = pci_domain_nr(dev->bus);
141 int bus = dev->bus->number;
142 int device = pci_ari_enabled(dev->bus) ? 0 : PCI_SLOT(dev->devfn);
143 struct acpi_prt_entry *entry;
144
145 if (((prt->address >> 16) & 0xffff) != device ||
146 prt->pin + 1 != pin)
147 return -ENODEV;
148
149 entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
150 if (!entry)
151 return -ENOMEM;
152
153
154
155
156
157
158 entry->id.segment = segment;
159 entry->id.bus = bus;
160 entry->id.device = (prt->address >> 16) & 0xFFFF;
161 entry->pin = prt->pin + 1;
162
163 do_prt_fixups(entry, prt);
164
165 entry->index = prt->source_index;
166
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178
179
180 if (prt->source[0])
181 acpi_get_handle(handle, prt->source, &entry->link);
182
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189
190 pr_debug("%04x:%02x:%02x[%c] -> %s[%d]\n",
191 entry->id.segment, entry->id.bus, entry->id.device,
192 pin_name(entry->pin), prt->source, entry->index);
193
194 *entry_ptr = entry;
195
196 return 0;
197}
198
199static int acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
200 int pin, struct acpi_prt_entry **entry_ptr)
201{
202 acpi_status status;
203 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
204 struct acpi_pci_routing_table *entry;
205 acpi_handle handle = NULL;
206
207 if (dev->bus->bridge)
208 handle = ACPI_HANDLE(dev->bus->bridge);
209
210 if (!handle)
211 return -ENODEV;
212
213
214 status = acpi_get_irq_routing_table(handle, &buffer);
215 if (ACPI_FAILURE(status)) {
216 kfree(buffer.pointer);
217 return -ENODEV;
218 }
219
220 entry = buffer.pointer;
221 while (entry && (entry->length > 0)) {
222 if (!acpi_pci_irq_check_entry(handle, dev, pin,
223 entry, entry_ptr))
224 break;
225 entry = (struct acpi_pci_routing_table *)
226 ((unsigned long)entry + entry->length);
227 }
228
229 kfree(buffer.pointer);
230 return 0;
231}
232
233
234
235
236#ifdef CONFIG_X86_IO_APIC
237extern int noioapicquirk;
238extern int noioapicreroute;
239
240static int bridge_has_boot_interrupt_variant(struct pci_bus *bus)
241{
242 struct pci_bus *bus_it;
243
244 for (bus_it = bus ; bus_it ; bus_it = bus_it->parent) {
245 if (!bus_it->self)
246 return 0;
247 if (bus_it->self->irq_reroute_variant)
248 return bus_it->self->irq_reroute_variant;
249 }
250 return 0;
251}
252
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257
258
259
260static int acpi_reroute_boot_interrupt(struct pci_dev *dev,
261 struct acpi_prt_entry *entry)
262{
263 if (noioapicquirk || noioapicreroute) {
264 return 0;
265 } else {
266 switch (bridge_has_boot_interrupt_variant(dev->bus)) {
267 case 0:
268
269 return 0;
270 case INTEL_IRQ_REROUTE_VARIANT:
271
272
273
274
275
276
277 dev_info(&dev->dev, "PCI IRQ %d -> rerouted to legacy "
278 "IRQ %d\n", entry->index,
279 (entry->index % 4) + 16);
280 entry->index = (entry->index % 4) + 16;
281 return 1;
282 default:
283 dev_warn(&dev->dev, "Cannot reroute IRQ %d to legacy "
284 "IRQ: unknown mapping\n", entry->index);
285 return -1;
286 }
287 }
288}
289#endif
290
291static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
292{
293 struct acpi_prt_entry *entry = NULL;
294 struct pci_dev *bridge;
295 u8 bridge_pin, orig_pin = pin;
296 int ret;
297
298 ret = acpi_pci_irq_find_prt_entry(dev, pin, &entry);
299 if (!ret && entry) {
300#ifdef CONFIG_X86_IO_APIC
301 acpi_reroute_boot_interrupt(dev, entry);
302#endif
303 dev_dbg(&dev->dev, "Found [%c] _PRT entry\n", pin_name(pin));
304 return entry;
305 }
306
307
308
309
310
311 bridge = dev->bus->self;
312 while (bridge) {
313 pin = pci_swizzle_interrupt_pin(dev, pin);
314
315 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
316
317 bridge_pin = bridge->pin;
318 if (!bridge_pin) {
319 dev_dbg(&bridge->dev, "No interrupt pin configured\n");
320 return NULL;
321 }
322 pin = bridge_pin;
323 }
324
325 ret = acpi_pci_irq_find_prt_entry(bridge, pin, &entry);
326 if (!ret && entry) {
327 dev_dbg(&dev->dev, "Derived GSI INT %c from %s\n",
328 pin_name(orig_pin), pci_name(bridge));
329 return entry;
330 }
331
332 dev = bridge;
333 bridge = dev->bus->self;
334 }
335
336 dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
337 pin_name(orig_pin));
338 return NULL;
339}
340
341#if IS_ENABLED(CONFIG_ISA) || IS_ENABLED(CONFIG_EISA)
342static int acpi_isa_register_gsi(struct pci_dev *dev)
343{
344 u32 dev_gsi;
345
346
347 if (dev->irq > 0 && (dev->irq <= 0xF) &&
348 acpi_isa_irq_available(dev->irq) &&
349 (acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) {
350 dev_warn(&dev->dev, "PCI INT %c: no GSI - using ISA IRQ %d\n",
351 pin_name(dev->pin), dev->irq);
352 acpi_register_gsi(&dev->dev, dev_gsi,
353 ACPI_LEVEL_SENSITIVE,
354 ACPI_ACTIVE_LOW);
355 return 0;
356 }
357 return -EINVAL;
358}
359#else
360static inline int acpi_isa_register_gsi(struct pci_dev *dev)
361{
362 return -ENODEV;
363}
364#endif
365
366static inline bool acpi_pci_irq_valid(struct pci_dev *dev, u8 pin)
367{
368#ifdef CONFIG_X86
369
370
371
372
373 if (dev->irq == 0xff) {
374 dev->irq = IRQ_NOTCONNECTED;
375 dev_warn(&dev->dev, "PCI INT %c: not connected\n",
376 pin_name(pin));
377 return false;
378 }
379#endif
380 return true;
381}
382
383int acpi_pci_irq_enable(struct pci_dev *dev)
384{
385 struct acpi_prt_entry *entry;
386 int gsi;
387 u8 pin;
388 int triggering = ACPI_LEVEL_SENSITIVE;
389
390
391
392
393
394
395
396 int polarity = acpi_irq_model == ACPI_IRQ_MODEL_GIC ?
397 ACPI_ACTIVE_HIGH : ACPI_ACTIVE_LOW;
398 char *link = NULL;
399 char link_desc[16];
400 int rc;
401
402 pin = dev->pin;
403 if (!pin) {
404 dev_dbg(&dev->dev, "No interrupt pin configured\n");
405 return 0;
406 }
407
408 if (dev->irq_managed && dev->irq > 0)
409 return 0;
410
411 entry = acpi_pci_irq_lookup(dev, pin);
412 if (!entry) {
413
414
415
416
417 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
418 (dev->class & 0x05) == 0)
419 return 0;
420 }
421
422 if (entry) {
423 if (entry->link)
424 gsi = acpi_pci_link_allocate_irq(entry->link,
425 entry->index,
426 &triggering, &polarity,
427 &link);
428 else
429 gsi = entry->index;
430 } else
431 gsi = -1;
432
433 if (gsi < 0) {
434
435
436
437
438 if (!acpi_pci_irq_valid(dev, pin)) {
439 kfree(entry);
440 return 0;
441 }
442
443 if (acpi_isa_register_gsi(dev))
444 dev_warn(&dev->dev, "PCI INT %c: no GSI\n",
445 pin_name(pin));
446
447 kfree(entry);
448 return 0;
449 }
450
451 rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity);
452 if (rc < 0) {
453 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
454 pin_name(pin));
455 kfree(entry);
456 return rc;
457 }
458 dev->irq = rc;
459 dev->irq_managed = 1;
460
461 if (link)
462 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
463 else
464 link_desc[0] = '\0';
465
466 dev_dbg(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
467 pin_name(pin), link_desc, gsi,
468 (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
469 (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
470
471 kfree(entry);
472 return 0;
473}
474
475void acpi_pci_irq_disable(struct pci_dev *dev)
476{
477 struct acpi_prt_entry *entry;
478 int gsi;
479 u8 pin;
480
481 pin = dev->pin;
482 if (!pin || !dev->irq_managed || dev->irq <= 0)
483 return;
484
485
486 if (dev->dev.power.is_prepared)
487 return;
488#ifdef CONFIG_PM
489 if (dev->dev.power.runtime_status == RPM_SUSPENDING)
490 return;
491#endif
492
493 entry = acpi_pci_irq_lookup(dev, pin);
494 if (!entry)
495 return;
496
497 if (entry->link)
498 gsi = acpi_pci_link_free_irq(entry->link);
499 else
500 gsi = entry->index;
501
502 kfree(entry);
503
504
505
506
507
508
509 dev_dbg(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
510 if (gsi >= 0) {
511 acpi_unregister_gsi(gsi);
512 dev->irq_managed = 0;
513 }
514}
515