1 | /* $NetBSD: acpi_pci_link.c,v 1.22 2014/09/14 19:54:05 mrg Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 2002 Mitsuru IWASAKI <iwasaki@jp.freebsd.org> |
5 | * All rights reserved. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
9 | * are met: |
10 | * 1. Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * 2. Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
15 | * |
16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
26 | * SUCH DAMAGE. |
27 | */ |
28 | |
29 | #include <sys/cdefs.h> |
30 | __KERNEL_RCSID(0, "$NetBSD: acpi_pci_link.c,v 1.22 2014/09/14 19:54:05 mrg Exp $" ); |
31 | |
32 | #include <sys/param.h> |
33 | #include <sys/malloc.h> |
34 | #include <sys/queue.h> |
35 | #include <sys/reboot.h> |
36 | #include <sys/systm.h> |
37 | |
38 | #include <dev/acpi/acpireg.h> |
39 | #include <dev/acpi/acpivar.h> |
40 | |
41 | #include <dev/pci/pcireg.h> |
42 | |
43 | #include "opt_acpi.h" |
44 | |
45 | |
46 | #define _COMPONENT ACPI_BUS_COMPONENT |
47 | ACPI_MODULE_NAME ("acpi_pci_link" ) |
48 | |
49 | MALLOC_DECLARE(M_ACPI); |
50 | |
51 | #define NUM_ISA_INTERRUPTS 16 |
52 | #define NUM_ACPI_INTERRUPTS 256 |
53 | |
54 | #define PCI_INVALID_IRQ 255 |
55 | #define PCI_INTERRUPT_VALID(x) ((x) != PCI_INVALID_IRQ && (x) != 0) |
56 | |
57 | #define ACPI_SERIAL_BEGIN(x) |
58 | #define ACPI_SERIAL_END(x) |
59 | |
60 | /* |
61 | * An ACPI PCI link device may contain multiple links. Each link has its |
62 | * own ACPI resource. _PRT entries specify which link is being used via |
63 | * the Source Index. |
64 | * |
65 | * XXX: A note about Source Indices and DPFs: Currently we assume that |
66 | * the DPF start and end tags are not counted towards the index that |
67 | * Source Index corresponds to. Also, we assume that when DPFs are in use |
68 | * they various sets overlap in terms of Indices. Here's an example |
69 | * resource list indicating these assumptions: |
70 | * |
71 | * Resource Index |
72 | * -------- ----- |
73 | * I/O Port 0 |
74 | * Start DPF - |
75 | * IRQ 1 |
76 | * MemIO 2 |
77 | * Start DPF - |
78 | * IRQ 1 |
79 | * MemIO 2 |
80 | * End DPF - |
81 | * DMA Channel 3 |
82 | * |
83 | * The XXX is because I'm not sure if this is a valid assumption to make. |
84 | */ |
85 | |
86 | /* States during DPF processing. */ |
87 | #define DPF_OUTSIDE 0 |
88 | #define DPF_FIRST 1 |
89 | #define DPF_IGNORE 2 |
90 | |
91 | struct link; |
92 | |
93 | struct acpi_pci_link_softc { |
94 | int pl_num_links; |
95 | int pl_crs_bad; |
96 | struct link *pl_links; |
97 | char pl_name[32]; |
98 | ACPI_HANDLE pl_handle; |
99 | TAILQ_ENTRY(acpi_pci_link_softc) pl_list; |
100 | }; |
101 | |
102 | static TAILQ_HEAD(, acpi_pci_link_softc) acpi_pci_linkdevs = |
103 | TAILQ_HEAD_INITIALIZER(acpi_pci_linkdevs); |
104 | |
105 | |
106 | struct link { |
107 | struct acpi_pci_link_softc *l_sc; |
108 | uint8_t l_bios_irq; |
109 | uint8_t l_irq; |
110 | uint8_t l_trig; |
111 | uint8_t l_pol; |
112 | uint8_t l_initial_irq; |
113 | int l_res_index; |
114 | int l_num_irqs; |
115 | int *l_irqs; |
116 | int l_references; |
117 | int l_dev_count; |
118 | pcitag_t *l_devices; |
119 | int l_routed:1; |
120 | int l_isa_irq:1; |
121 | ACPI_RESOURCE l_prs_template; |
122 | }; |
123 | |
124 | struct link_count_request { |
125 | int in_dpf; |
126 | int count; |
127 | }; |
128 | |
129 | struct link_res_request { |
130 | struct acpi_pci_link_softc *sc; |
131 | int in_dpf; |
132 | int res_index; |
133 | int link_index; |
134 | }; |
135 | |
136 | static int pci_link_interrupt_weights[NUM_ACPI_INTERRUPTS]; |
137 | static int pci_link_bios_isa_irqs; |
138 | |
139 | static ACPI_STATUS acpi_count_irq_resources(ACPI_RESOURCE *, void *); |
140 | static ACPI_STATUS link_add_crs(ACPI_RESOURCE *, void *); |
141 | static ACPI_STATUS link_add_prs(ACPI_RESOURCE *, void *); |
142 | static int link_valid_irq(struct link *, int); |
143 | static void acpi_pci_link_dump(struct acpi_pci_link_softc *); |
144 | static int acpi_pci_link_attach(struct acpi_pci_link_softc *); |
145 | static uint8_t acpi_pci_link_search_irq(struct acpi_pci_link_softc *, int, int, |
146 | int); |
147 | static struct link *acpi_pci_link_lookup(struct acpi_pci_link_softc *, int); |
148 | static ACPI_STATUS acpi_pci_link_srs(struct acpi_pci_link_softc *, |
149 | ACPI_BUFFER *); |
150 | static ACPI_STATUS acpi_AppendBufferResource(ACPI_BUFFER *, ACPI_RESOURCE *); |
151 | |
152 | static ACPI_STATUS |
153 | acpi_count_irq_resources(ACPI_RESOURCE *res, void *context) |
154 | { |
155 | struct link_count_request *req; |
156 | |
157 | req = (struct link_count_request *)context; |
158 | switch (res->Type) { |
159 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
160 | switch (req->in_dpf) { |
161 | case DPF_OUTSIDE: |
162 | /* We've started the first DPF. */ |
163 | req->in_dpf = DPF_FIRST; |
164 | break; |
165 | case DPF_FIRST: |
166 | /* We've started the second DPF. */ |
167 | req->in_dpf = DPF_IGNORE; |
168 | break; |
169 | } |
170 | break; |
171 | case ACPI_RESOURCE_TYPE_END_DEPENDENT: |
172 | /* We are finished with DPF parsing. */ |
173 | KASSERT(req->in_dpf != DPF_OUTSIDE); |
174 | req->in_dpf = DPF_OUTSIDE; |
175 | break; |
176 | case ACPI_RESOURCE_TYPE_IRQ: |
177 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
178 | /* |
179 | * Don't count resources if we are in a DPF set that we are |
180 | * ignoring. |
181 | */ |
182 | if (req->in_dpf != DPF_IGNORE) |
183 | req->count++; |
184 | } |
185 | return (AE_OK); |
186 | } |
187 | |
188 | static ACPI_STATUS |
189 | link_add_crs(ACPI_RESOURCE *res, void *context) |
190 | { |
191 | struct link_res_request *req; |
192 | struct link *link; |
193 | |
194 | req = (struct link_res_request *)context; |
195 | switch (res->Type) { |
196 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
197 | switch (req->in_dpf) { |
198 | case DPF_OUTSIDE: |
199 | /* We've started the first DPF. */ |
200 | req->in_dpf = DPF_FIRST; |
201 | break; |
202 | case DPF_FIRST: |
203 | /* We've started the second DPF. */ |
204 | panic( |
205 | "%s: Multiple dependent functions within a current resource" , |
206 | __func__); |
207 | break; |
208 | } |
209 | break; |
210 | case ACPI_RESOURCE_TYPE_END_DEPENDENT: |
211 | /* We are finished with DPF parsing. */ |
212 | KASSERT(req->in_dpf != DPF_OUTSIDE); |
213 | req->in_dpf = DPF_OUTSIDE; |
214 | break; |
215 | case ACPI_RESOURCE_TYPE_IRQ: |
216 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
217 | KASSERT(req->link_index < req->sc->pl_num_links); |
218 | link = &req->sc->pl_links[req->link_index]; |
219 | link->l_res_index = req->res_index; |
220 | req->link_index++; |
221 | req->res_index++; |
222 | |
223 | /* |
224 | * Only use the current value if there's one IRQ. Some |
225 | * systems return multiple IRQs (which is nonsense for _CRS) |
226 | * when the link hasn't been programmed. |
227 | */ |
228 | if (res->Type == ACPI_RESOURCE_TYPE_IRQ) { |
229 | if (res->Data.Irq.InterruptCount == 1) { |
230 | link->l_irq = res->Data.Irq.Interrupts[0]; |
231 | link->l_trig = res->Data.Irq.Triggering; |
232 | link->l_pol = res->Data.Irq.Polarity; |
233 | } |
234 | } else if (res->Data.ExtendedIrq.InterruptCount == 1) { |
235 | link->l_irq = res->Data.ExtendedIrq.Interrupts[0]; |
236 | link->l_trig = res->Data.ExtendedIrq.Triggering; |
237 | link->l_pol = res->Data.ExtendedIrq.Polarity; |
238 | } |
239 | |
240 | /* |
241 | * An IRQ of zero means that the link isn't routed. |
242 | */ |
243 | if (link->l_irq == 0) |
244 | link->l_irq = PCI_INVALID_IRQ; |
245 | break; |
246 | default: |
247 | req->res_index++; |
248 | } |
249 | return (AE_OK); |
250 | } |
251 | |
252 | /* |
253 | * Populate the set of possible IRQs for each device. |
254 | */ |
255 | static ACPI_STATUS |
256 | link_add_prs(ACPI_RESOURCE *res, void *context) |
257 | { |
258 | struct link_res_request *req; |
259 | struct link *link; |
260 | uint8_t *irqs = NULL; |
261 | uint32_t *ext_irqs = NULL; |
262 | int i, is_ext_irq = 1; |
263 | |
264 | req = (struct link_res_request *)context; |
265 | switch (res->Type) { |
266 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
267 | switch (req->in_dpf) { |
268 | case DPF_OUTSIDE: |
269 | /* We've started the first DPF. */ |
270 | req->in_dpf = DPF_FIRST; |
271 | break; |
272 | case DPF_FIRST: |
273 | /* We've started the second DPF. */ |
274 | req->in_dpf = DPF_IGNORE; |
275 | break; |
276 | } |
277 | break; |
278 | case ACPI_RESOURCE_TYPE_END_DEPENDENT: |
279 | /* We are finished with DPF parsing. */ |
280 | KASSERT(req->in_dpf != DPF_OUTSIDE); |
281 | req->in_dpf = DPF_OUTSIDE; |
282 | break; |
283 | case ACPI_RESOURCE_TYPE_IRQ: |
284 | is_ext_irq = 0; |
285 | /* fall through */ |
286 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
287 | /* |
288 | * Don't parse resources if we are in a DPF set that we are |
289 | * ignoring. |
290 | */ |
291 | if (req->in_dpf == DPF_IGNORE) |
292 | break; |
293 | |
294 | KASSERT(req->link_index < req->sc->pl_num_links); |
295 | link = &req->sc->pl_links[req->link_index]; |
296 | if (link->l_res_index == -1) { |
297 | KASSERT(req->sc->pl_crs_bad); |
298 | link->l_res_index = req->res_index; |
299 | } |
300 | req->link_index++; |
301 | req->res_index++; |
302 | |
303 | /* |
304 | * Stash a copy of the resource for later use when |
305 | * doing _SRS. |
306 | * |
307 | * Note that in theory res->Length may exceed the size |
308 | * of ACPI_RESOURCE, due to variable length lists in |
309 | * subtypes. However, all uses of l_prs_template only |
310 | * rely on lists lengths of zero or one, for which |
311 | * sizeof(ACPI_RESOURCE) is sufficient space anyway. |
312 | * We cannot read longer than Length bytes, in case we |
313 | * read off the end of mapped memory. So we read |
314 | * whichever length is shortest, Length or |
315 | * sizeof(ACPI_RESOURCE). |
316 | */ |
317 | KASSERT(res->Length >= ACPI_RS_SIZE_MIN); |
318 | |
319 | memset(&link->l_prs_template, 0, sizeof(link->l_prs_template)); |
320 | memcpy(&link->l_prs_template, res, |
321 | MIN(res->Length, sizeof(link->l_prs_template))); |
322 | |
323 | if (is_ext_irq) { |
324 | link->l_num_irqs = |
325 | res->Data.ExtendedIrq.InterruptCount; |
326 | link->l_trig = res->Data.ExtendedIrq.Triggering; |
327 | link->l_pol = res->Data.ExtendedIrq.Polarity; |
328 | ext_irqs = res->Data.ExtendedIrq.Interrupts; |
329 | } else { |
330 | link->l_num_irqs = res->Data.Irq.InterruptCount; |
331 | link->l_trig = res->Data.Irq.Triggering; |
332 | link->l_pol = res->Data.Irq.Polarity; |
333 | irqs = res->Data.Irq.Interrupts; |
334 | } |
335 | if (link->l_num_irqs == 0) |
336 | break; |
337 | |
338 | /* |
339 | * Save a list of the valid IRQs. Also, if all of the |
340 | * valid IRQs are ISA IRQs, then mark this link as |
341 | * routed via an ISA interrupt. |
342 | */ |
343 | link->l_isa_irq = TRUE; |
344 | link->l_irqs = malloc(sizeof(int) * link->l_num_irqs, |
345 | M_ACPI, M_WAITOK | M_ZERO); |
346 | for (i = 0; i < link->l_num_irqs; i++) { |
347 | if (is_ext_irq) { |
348 | link->l_irqs[i] = ext_irqs[i]; |
349 | if (ext_irqs[i] >= NUM_ISA_INTERRUPTS) |
350 | link->l_isa_irq = FALSE; |
351 | } else { |
352 | link->l_irqs[i] = irqs[i]; |
353 | if (irqs[i] >= NUM_ISA_INTERRUPTS) |
354 | link->l_isa_irq = FALSE; |
355 | } |
356 | } |
357 | break; |
358 | default: |
359 | if (req->in_dpf == DPF_IGNORE) |
360 | break; |
361 | if (req->sc->pl_crs_bad) |
362 | aprint_normal("%s: Warning: possible resource %d " |
363 | "will be lost during _SRS\n" , req->sc->pl_name, |
364 | req->res_index); |
365 | req->res_index++; |
366 | } |
367 | return (AE_OK); |
368 | } |
369 | |
370 | static int |
371 | link_valid_irq(struct link *link, int irq) |
372 | { |
373 | int i; |
374 | |
375 | /* Invalid interrupts are never valid. */ |
376 | if (!PCI_INTERRUPT_VALID(irq)) |
377 | return (FALSE); |
378 | |
379 | /* Any interrupt in the list of possible interrupts is valid. */ |
380 | for (i = 0; i < link->l_num_irqs; i++) |
381 | if (link->l_irqs[i] == irq) |
382 | return (TRUE); |
383 | |
384 | /* |
385 | * For links routed via an ISA interrupt, if the SCI is routed via |
386 | * an ISA interrupt, the SCI is always treated as a valid IRQ. |
387 | */ |
388 | if (link->l_isa_irq && AcpiGbl_FADT.SciInterrupt == irq && |
389 | irq < NUM_ISA_INTERRUPTS) |
390 | return (TRUE); |
391 | |
392 | /* If the interrupt wasn't found in the list it is not valid. */ |
393 | return (FALSE); |
394 | } |
395 | |
396 | void |
397 | acpi_pci_link_state(void) |
398 | { |
399 | struct acpi_pci_link_softc *sc; |
400 | |
401 | TAILQ_FOREACH(sc, &acpi_pci_linkdevs, pl_list) { |
402 | acpi_pci_link_dump(sc); |
403 | } |
404 | } |
405 | |
406 | static void |
407 | acpi_pci_link_dump(struct acpi_pci_link_softc *sc) |
408 | { |
409 | struct link *link; |
410 | int i, j; |
411 | |
412 | printf("Link Device %s:\n" , sc->pl_name); |
413 | printf("Index IRQ Rtd Ref IRQs\n" ); |
414 | for (i = 0; i < sc->pl_num_links; i++) { |
415 | link = &sc->pl_links[i]; |
416 | printf("%5d %3d %c %3d " , i, link->l_irq, |
417 | link->l_routed ? 'Y' : 'N', link->l_references); |
418 | if (link->l_num_irqs == 0) |
419 | printf(" none" ); |
420 | else for (j = 0; j < link->l_num_irqs; j++) |
421 | printf(" %d" , link->l_irqs[j]); |
422 | printf(" polarity %u trigger %u\n" , link->l_pol, link->l_trig); |
423 | } |
424 | printf("\n" ); |
425 | } |
426 | |
427 | static int |
428 | acpi_pci_link_attach(struct acpi_pci_link_softc *sc) |
429 | { |
430 | struct link_count_request creq; |
431 | struct link_res_request rreq; |
432 | ACPI_STATUS status; |
433 | int i; |
434 | |
435 | ACPI_SERIAL_BEGIN(pci_link); |
436 | |
437 | /* |
438 | * Count the number of current resources so we know how big of |
439 | * a link array to allocate. On some systems, _CRS is broken, |
440 | * so for those systems try to derive the count from _PRS instead. |
441 | */ |
442 | creq.in_dpf = DPF_OUTSIDE; |
443 | creq.count = 0; |
444 | status = AcpiWalkResources(sc->pl_handle, "_CRS" , |
445 | acpi_count_irq_resources, &creq); |
446 | sc->pl_crs_bad = ACPI_FAILURE(status); |
447 | if (sc->pl_crs_bad) { |
448 | creq.in_dpf = DPF_OUTSIDE; |
449 | creq.count = 0; |
450 | status = AcpiWalkResources(sc->pl_handle, "_PRS" , |
451 | acpi_count_irq_resources, &creq); |
452 | if (ACPI_FAILURE(status)) { |
453 | aprint_error("%s: Unable to parse _CRS or _PRS: %s\n" , |
454 | sc->pl_name, AcpiFormatException(status)); |
455 | ACPI_SERIAL_END(pci_link); |
456 | return (ENXIO); |
457 | } |
458 | } |
459 | sc->pl_num_links = creq.count; |
460 | if (creq.count == 0) { |
461 | ACPI_SERIAL_END(pci_link); |
462 | return (0); |
463 | } |
464 | sc->pl_links = malloc(sizeof(struct link) * sc->pl_num_links, |
465 | M_ACPI, M_WAITOK | M_ZERO); |
466 | |
467 | /* Initialize the child links. */ |
468 | for (i = 0; i < sc->pl_num_links; i++) { |
469 | sc->pl_links[i].l_irq = PCI_INVALID_IRQ; |
470 | sc->pl_links[i].l_bios_irq = PCI_INVALID_IRQ; |
471 | sc->pl_links[i].l_sc = sc; |
472 | sc->pl_links[i].l_isa_irq = FALSE; |
473 | sc->pl_links[i].l_res_index = -1; |
474 | sc->pl_links[i].l_dev_count = 0; |
475 | sc->pl_links[i].l_devices = NULL; |
476 | } |
477 | |
478 | /* Try to read the current settings from _CRS if it is valid. */ |
479 | if (!sc->pl_crs_bad) { |
480 | rreq.in_dpf = DPF_OUTSIDE; |
481 | rreq.link_index = 0; |
482 | rreq.res_index = 0; |
483 | rreq.sc = sc; |
484 | status = AcpiWalkResources(sc->pl_handle, "_CRS" , |
485 | link_add_crs, &rreq); |
486 | if (ACPI_FAILURE(status)) { |
487 | aprint_error("%s: Unable to parse _CRS: %s\n" , |
488 | sc->pl_name, AcpiFormatException(status)); |
489 | goto fail; |
490 | } |
491 | } |
492 | |
493 | /* |
494 | * Try to read the possible settings from _PRS. Note that if the |
495 | * _CRS is toast, we depend on having a working _PRS. However, if |
496 | * _CRS works, then it is ok for _PRS to be missing. |
497 | */ |
498 | rreq.in_dpf = DPF_OUTSIDE; |
499 | rreq.link_index = 0; |
500 | rreq.res_index = 0; |
501 | rreq.sc = sc; |
502 | status = AcpiWalkResources(sc->pl_handle, "_PRS" , |
503 | link_add_prs, &rreq); |
504 | if (ACPI_FAILURE(status) && |
505 | (status != AE_NOT_FOUND || sc->pl_crs_bad)) { |
506 | aprint_error("%s: Unable to parse _PRS: %s\n" , |
507 | sc->pl_name, AcpiFormatException(status)); |
508 | goto fail; |
509 | } |
510 | if (boothowto & AB_VERBOSE) { |
511 | aprint_normal("%s: Links after initial probe:\n" , sc->pl_name); |
512 | acpi_pci_link_dump(sc); |
513 | } |
514 | |
515 | /* Verify initial IRQs if we have _PRS. */ |
516 | if (status != AE_NOT_FOUND) |
517 | for (i = 0; i < sc->pl_num_links; i++) |
518 | if (!link_valid_irq(&sc->pl_links[i], |
519 | sc->pl_links[i].l_irq)) |
520 | sc->pl_links[i].l_irq = PCI_INVALID_IRQ; |
521 | if (boothowto & AB_VERBOSE) { |
522 | printf("%s: Links after initial validation:\n" , sc->pl_name); |
523 | acpi_pci_link_dump(sc); |
524 | } |
525 | |
526 | /* Save initial IRQs. */ |
527 | for (i = 0; i < sc->pl_num_links; i++) |
528 | sc->pl_links[i].l_initial_irq = sc->pl_links[i].l_irq; |
529 | |
530 | /* |
531 | * Try to disable this link. If successful, set the current IRQ to |
532 | * zero and flags to indicate this link is not routed. If we can't |
533 | * run _DIS (i.e., the method doesn't exist), assume the initial |
534 | * IRQ was routed by the BIOS. |
535 | */ |
536 | #ifndef ACPI__DIS_IS_BROKEN |
537 | if (ACPI_SUCCESS(AcpiEvaluateObject(sc->pl_handle, "_DIS" , NULL, |
538 | NULL))) |
539 | for (i = 0; i < sc->pl_num_links; i++) |
540 | sc->pl_links[i].l_irq = PCI_INVALID_IRQ; |
541 | else |
542 | #endif |
543 | for (i = 0; i < sc->pl_num_links; i++) |
544 | if (PCI_INTERRUPT_VALID(sc->pl_links[i].l_irq)) |
545 | sc->pl_links[i].l_routed = TRUE; |
546 | if (boothowto & AB_VERBOSE) { |
547 | printf("%s: Links after disable:\n" , sc->pl_name); |
548 | acpi_pci_link_dump(sc); |
549 | } |
550 | ACPI_SERIAL_END(pci_link); |
551 | return (0); |
552 | fail: |
553 | ACPI_SERIAL_END(pci_link); |
554 | for (i = 0; i < sc->pl_num_links; i++) { |
555 | if (sc->pl_links[i].l_irqs != NULL) |
556 | free(sc->pl_links[i].l_irqs, M_ACPI); |
557 | if (sc->pl_links[i].l_devices != NULL) |
558 | free(sc->pl_links[i].l_devices, M_ACPI); |
559 | } |
560 | free(sc->pl_links, M_ACPI); |
561 | return (ENXIO); |
562 | } |
563 | |
564 | static void |
565 | acpi_pci_link_add_functions(struct acpi_pci_link_softc *sc, struct link *link, |
566 | int bus, int device, int pin) |
567 | { |
568 | uint32_t value; |
569 | uint8_t func, maxfunc, ipin; |
570 | pcitag_t tag; |
571 | |
572 | tag = pci_make_tag(acpi_softc->sc_pc, bus, device, 0); |
573 | /* See if we have a valid device at function 0. */ |
574 | value = pci_conf_read(acpi_softc->sc_pc, tag, PCI_BHLC_REG); |
575 | if (PCI_HDRTYPE_TYPE(value) > PCI_HDRTYPE_PCB) |
576 | return; |
577 | if (PCI_HDRTYPE_MULTIFN(value)) |
578 | maxfunc = 7; |
579 | else |
580 | maxfunc = 0; |
581 | |
582 | /* Scan all possible functions at this device. */ |
583 | for (func = 0; func <= maxfunc; func++) { |
584 | tag = pci_make_tag(acpi_softc->sc_pc, bus, device, func); |
585 | value = pci_conf_read(acpi_softc->sc_pc, tag, PCI_ID_REG); |
586 | if (PCI_VENDOR(value) == 0xffff) |
587 | continue; |
588 | value = pci_conf_read(acpi_softc->sc_pc, tag, |
589 | PCI_INTERRUPT_REG); |
590 | ipin = PCI_INTERRUPT_PIN(value); |
591 | /* |
592 | * See if it uses the pin in question. Note that the passed |
593 | * in pin uses 0 for A, .. 3 for D whereas the intpin |
594 | * register uses 0 for no interrupt, 1 for A, .. 4 for D. |
595 | */ |
596 | if (ipin != pin + 1) |
597 | continue; |
598 | |
599 | link->l_devices = realloc(link->l_devices, |
600 | sizeof(pcitag_t) * (link->l_dev_count + 1), |
601 | M_ACPI, M_WAITOK); |
602 | link->l_devices[link->l_dev_count] = tag; |
603 | ++link->l_dev_count; |
604 | } |
605 | } |
606 | |
607 | static uint8_t |
608 | acpi_pci_link_search_irq(struct acpi_pci_link_softc *sc, int bus, int device, |
609 | int pin) |
610 | { |
611 | uint32_t value; |
612 | uint8_t func, maxfunc, ipin, iline; |
613 | pcitag_t tag; |
614 | |
615 | tag = pci_make_tag(acpi_softc->sc_pc, bus, device, 0); |
616 | /* See if we have a valid device at function 0. */ |
617 | value = pci_conf_read(acpi_softc->sc_pc, tag, PCI_BHLC_REG); |
618 | if (PCI_HDRTYPE_TYPE(value) > PCI_HDRTYPE_PCB) |
619 | return (PCI_INVALID_IRQ); |
620 | if (PCI_HDRTYPE_MULTIFN(value)) |
621 | maxfunc = 7; |
622 | else |
623 | maxfunc = 0; |
624 | |
625 | /* Scan all possible functions at this device. */ |
626 | for (func = 0; func <= maxfunc; func++) { |
627 | tag = pci_make_tag(acpi_softc->sc_pc, bus, device, func); |
628 | value = pci_conf_read(acpi_softc->sc_pc, tag, PCI_ID_REG); |
629 | if (PCI_VENDOR(value) == 0xffff) |
630 | continue; |
631 | value = pci_conf_read(acpi_softc->sc_pc, tag, |
632 | PCI_INTERRUPT_REG); |
633 | ipin = PCI_INTERRUPT_PIN(value); |
634 | iline = PCI_INTERRUPT_LINE(value); |
635 | |
636 | /* |
637 | * See if it uses the pin in question. Note that the passed |
638 | * in pin uses 0 for A, .. 3 for D whereas the intpin |
639 | * register uses 0 for no interrupt, 1 for A, .. 4 for D. |
640 | */ |
641 | if (ipin != pin + 1) |
642 | continue; |
643 | aprint_verbose( |
644 | "%s: ACPI: Found matching pin for %d.%d.INT%c" |
645 | " at func %d: %d\n" , |
646 | sc->pl_name, bus, device, pin + 'A', func, iline); |
647 | if (PCI_INTERRUPT_VALID(iline)) |
648 | return (iline); |
649 | } |
650 | return (PCI_INVALID_IRQ); |
651 | } |
652 | |
653 | /* |
654 | * Find the link structure that corresponds to the resource index passed in |
655 | * via 'source_index'. |
656 | */ |
657 | static struct link * |
658 | acpi_pci_link_lookup(struct acpi_pci_link_softc *sc, int source_index) |
659 | { |
660 | int i; |
661 | |
662 | for (i = 0; i < sc->pl_num_links; i++) |
663 | if (sc->pl_links[i].l_res_index == source_index) |
664 | return (&sc->pl_links[i]); |
665 | return (NULL); |
666 | } |
667 | |
668 | void |
669 | acpi_pci_link_add_reference(void *v, int index, int bus, int slot, int pin) |
670 | { |
671 | struct acpi_pci_link_softc *sc = v; |
672 | struct link *link; |
673 | uint8_t bios_irq; |
674 | |
675 | /* Bump the reference count. */ |
676 | ACPI_SERIAL_BEGIN(pci_link); |
677 | link = acpi_pci_link_lookup(sc, index); |
678 | if (link == NULL) { |
679 | printf("%s: apparently invalid index %d\n" , sc->pl_name, index); |
680 | ACPI_SERIAL_END(pci_link); |
681 | return; |
682 | } |
683 | link->l_references++; |
684 | acpi_pci_link_add_functions(sc, link, bus, slot, pin); |
685 | if (link->l_routed) |
686 | pci_link_interrupt_weights[link->l_irq]++; |
687 | |
688 | /* |
689 | * The BIOS only routes interrupts via ISA IRQs using the ATPICs |
690 | * (8259As). Thus, if this link is routed via an ISA IRQ, go |
691 | * look to see if the BIOS routed an IRQ for this link at the |
692 | * indicated (bus, slot, pin). If so, we prefer that IRQ for |
693 | * this link and add that IRQ to our list of known-good IRQs. |
694 | * This provides a good work-around for link devices whose _CRS |
695 | * method is either broken or bogus. We only use the value |
696 | * returned by _CRS if we can't find a valid IRQ via this method |
697 | * in fact. |
698 | * |
699 | * If this link is not routed via an ISA IRQ (because we are using |
700 | * APIC for example), then don't bother looking up the BIOS IRQ |
701 | * as if we find one it won't be valid anyway. |
702 | */ |
703 | if (!link->l_isa_irq) { |
704 | ACPI_SERIAL_END(pci_link); |
705 | return; |
706 | } |
707 | |
708 | /* Try to find a BIOS IRQ setting from any matching devices. */ |
709 | bios_irq = acpi_pci_link_search_irq(sc, bus, slot, pin); |
710 | if (!PCI_INTERRUPT_VALID(bios_irq)) { |
711 | ACPI_SERIAL_END(pci_link); |
712 | return; |
713 | } |
714 | |
715 | /* Validate the BIOS IRQ. */ |
716 | if (!link_valid_irq(link, bios_irq)) { |
717 | printf("%s: BIOS IRQ %u for %d.%d.INT%c is invalid\n" , |
718 | sc->pl_name, bios_irq, (int)bus, slot, pin + 'A'); |
719 | } else if (!PCI_INTERRUPT_VALID(link->l_bios_irq)) { |
720 | link->l_bios_irq = bios_irq; |
721 | if (bios_irq < NUM_ISA_INTERRUPTS) |
722 | pci_link_bios_isa_irqs |= (1 << bios_irq); |
723 | if (bios_irq != link->l_initial_irq && |
724 | PCI_INTERRUPT_VALID(link->l_initial_irq)) |
725 | printf( |
726 | "%s: BIOS IRQ %u does not match initial IRQ %u\n" , |
727 | sc->pl_name, bios_irq, link->l_initial_irq); |
728 | } else if (bios_irq != link->l_bios_irq) |
729 | printf( |
730 | "%s: BIOS IRQ %u for %d.%d.INT%c does not match " |
731 | "previous BIOS IRQ %u\n" , |
732 | sc->pl_name, bios_irq, (int)bus, slot, pin + 'A', |
733 | link->l_bios_irq); |
734 | ACPI_SERIAL_END(pci_link); |
735 | } |
736 | |
737 | static ACPI_STATUS |
738 | acpi_pci_link_srs_from_crs(struct acpi_pci_link_softc *sc, ACPI_BUFFER *srsbuf) |
739 | { |
740 | ACPI_RESOURCE *resource, *end, newres, *resptr; |
741 | ACPI_BUFFER crsbuf; |
742 | ACPI_STATUS status; |
743 | struct link *link; |
744 | int i, in_dpf; |
745 | |
746 | /* Fetch the _CRS. */ |
747 | crsbuf.Pointer = NULL; |
748 | crsbuf.Length = ACPI_ALLOCATE_LOCAL_BUFFER; |
749 | status = AcpiGetCurrentResources(sc->pl_handle, &crsbuf); |
750 | if (ACPI_SUCCESS(status) && crsbuf.Pointer == NULL) |
751 | status = AE_NO_MEMORY; |
752 | if (ACPI_FAILURE(status)) { |
753 | aprint_verbose("%s: Unable to fetch current resources: %s\n" , |
754 | sc->pl_name, AcpiFormatException(status)); |
755 | return (status); |
756 | } |
757 | |
758 | /* Fill in IRQ resources via link structures. */ |
759 | srsbuf->Pointer = NULL; |
760 | link = sc->pl_links; |
761 | i = 0; |
762 | in_dpf = DPF_OUTSIDE; |
763 | resource = (ACPI_RESOURCE *)crsbuf.Pointer; |
764 | end = (ACPI_RESOURCE *)((char *)crsbuf.Pointer + crsbuf.Length); |
765 | for (;;) { |
766 | switch (resource->Type) { |
767 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
768 | switch (in_dpf) { |
769 | case DPF_OUTSIDE: |
770 | /* We've started the first DPF. */ |
771 | in_dpf = DPF_FIRST; |
772 | break; |
773 | case DPF_FIRST: |
774 | /* We've started the second DPF. */ |
775 | panic( |
776 | "%s: Multiple dependent functions within a current resource" , |
777 | __func__); |
778 | break; |
779 | } |
780 | resptr = NULL; |
781 | break; |
782 | case ACPI_RESOURCE_TYPE_END_DEPENDENT: |
783 | /* We are finished with DPF parsing. */ |
784 | KASSERT(in_dpf != DPF_OUTSIDE); |
785 | in_dpf = DPF_OUTSIDE; |
786 | resptr = NULL; |
787 | break; |
788 | case ACPI_RESOURCE_TYPE_IRQ: |
789 | newres = link->l_prs_template; |
790 | resptr = &newres; |
791 | resptr->Data.Irq.InterruptCount = 1; |
792 | if (PCI_INTERRUPT_VALID(link->l_irq)) { |
793 | KASSERT(link->l_irq < NUM_ISA_INTERRUPTS); |
794 | resptr->Data.Irq.Interrupts[0] = link->l_irq; |
795 | resptr->Data.Irq.Triggering = link->l_trig; |
796 | resptr->Data.Irq.Polarity = link->l_pol; |
797 | } else |
798 | resptr->Data.Irq.Interrupts[0] = 0; |
799 | link++; |
800 | i++; |
801 | break; |
802 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
803 | newres = link->l_prs_template; |
804 | resptr = &newres; |
805 | resptr->Data.ExtendedIrq.InterruptCount = 1; |
806 | if (PCI_INTERRUPT_VALID(link->l_irq)) { |
807 | resptr->Data.ExtendedIrq.Interrupts[0] = |
808 | link->l_irq; |
809 | resptr->Data.ExtendedIrq.Triggering = |
810 | link->l_trig; |
811 | resptr->Data.ExtendedIrq.Polarity = link->l_pol; |
812 | } else |
813 | resptr->Data.ExtendedIrq.Interrupts[0] = 0; |
814 | link++; |
815 | i++; |
816 | break; |
817 | default: |
818 | resptr = resource; |
819 | } |
820 | if (resptr != NULL) { |
821 | status = acpi_AppendBufferResource(srsbuf, resptr); |
822 | if (ACPI_FAILURE(status)) { |
823 | printf("%s: Unable to build resources: %s\n" , |
824 | sc->pl_name, AcpiFormatException(status)); |
825 | if (srsbuf->Pointer != NULL) |
826 | ACPI_FREE(srsbuf->Pointer); |
827 | ACPI_FREE(crsbuf.Pointer); |
828 | return (status); |
829 | } |
830 | } |
831 | if (resource->Type == ACPI_RESOURCE_TYPE_END_TAG) |
832 | break; |
833 | resource = ACPI_NEXT_RESOURCE(resource); |
834 | if (resource >= end) |
835 | break; |
836 | } |
837 | ACPI_FREE(crsbuf.Pointer); |
838 | return (AE_OK); |
839 | } |
840 | |
841 | static ACPI_STATUS |
842 | acpi_pci_link_srs_from_links(struct acpi_pci_link_softc *sc, |
843 | ACPI_BUFFER *srsbuf) |
844 | { |
845 | ACPI_RESOURCE newres; |
846 | ACPI_STATUS status; |
847 | struct link *link; |
848 | int i; |
849 | |
850 | /* Start off with an empty buffer. */ |
851 | srsbuf->Pointer = NULL; |
852 | link = sc->pl_links; |
853 | for (i = 0; i < sc->pl_num_links; i++) { |
854 | |
855 | /* Add a new IRQ resource from each link. */ |
856 | link = &sc->pl_links[i]; |
857 | newres = link->l_prs_template; |
858 | if (newres.Type == ACPI_RESOURCE_TYPE_IRQ) { |
859 | |
860 | /* Build an IRQ resource. */ |
861 | newres.Data.Irq.InterruptCount = 1; |
862 | if (PCI_INTERRUPT_VALID(link->l_irq)) { |
863 | KASSERT(link->l_irq < NUM_ISA_INTERRUPTS); |
864 | newres.Data.Irq.Interrupts[0] = link->l_irq; |
865 | newres.Data.Irq.Triggering = link->l_trig; |
866 | newres.Data.Irq.Polarity = link->l_pol; |
867 | } else |
868 | newres.Data.Irq.Interrupts[0] = 0; |
869 | } else { |
870 | |
871 | /* Build an ExtIRQ resuorce. */ |
872 | newres.Data.ExtendedIrq.InterruptCount = 1; |
873 | if (PCI_INTERRUPT_VALID(link->l_irq)) { |
874 | newres.Data.ExtendedIrq.Interrupts[0] = |
875 | link->l_irq; |
876 | newres.Data.ExtendedIrq.Triggering = |
877 | link->l_trig; |
878 | newres.Data.ExtendedIrq.Polarity = |
879 | link->l_pol; |
880 | } else { |
881 | newres.Data.ExtendedIrq.Interrupts[0] = 0; |
882 | } |
883 | } |
884 | |
885 | /* Add the new resource to the end of the _SRS buffer. */ |
886 | status = acpi_AppendBufferResource(srsbuf, &newres); |
887 | if (ACPI_FAILURE(status)) { |
888 | printf("%s: Unable to build resources: %s\n" , |
889 | sc->pl_name, AcpiFormatException(status)); |
890 | if (srsbuf->Pointer != NULL) |
891 | ACPI_FREE(srsbuf->Pointer); |
892 | return (status); |
893 | } |
894 | } |
895 | return (AE_OK); |
896 | } |
897 | |
898 | static ACPI_STATUS |
899 | acpi_pci_link_srs(struct acpi_pci_link_softc *sc, ACPI_BUFFER *srsbuf) |
900 | { |
901 | ACPI_STATUS status; |
902 | |
903 | if (sc->pl_crs_bad) |
904 | status = acpi_pci_link_srs_from_links(sc, srsbuf); |
905 | else |
906 | status = acpi_pci_link_srs_from_crs(sc, srsbuf); |
907 | |
908 | if (ACPI_FAILURE(status)) |
909 | printf("%s: Unable to find link srs : %s\n" , |
910 | sc->pl_name, AcpiFormatException(status)); |
911 | |
912 | /* Write out new resources via _SRS. */ |
913 | return AcpiSetCurrentResources(sc->pl_handle, srsbuf); |
914 | } |
915 | |
916 | static ACPI_STATUS |
917 | acpi_pci_link_route_irqs(struct acpi_pci_link_softc *sc, int *irq, int *pol, |
918 | int *trig) |
919 | { |
920 | ACPI_RESOURCE *resource, *end; |
921 | ACPI_BUFFER srsbuf; |
922 | ACPI_STATUS status; |
923 | struct link *link; |
924 | int i, is_ext = 0; |
925 | |
926 | status = acpi_pci_link_srs(sc, &srsbuf); |
927 | if (ACPI_FAILURE(status)) { |
928 | printf("%s: _SRS failed: %s\n" , |
929 | sc->pl_name, AcpiFormatException(status)); |
930 | return (status); |
931 | } |
932 | /* |
933 | * Perform acpi_config_intr() on each IRQ resource if it was just |
934 | * routed for the first time. |
935 | */ |
936 | link = sc->pl_links; |
937 | i = 0; |
938 | resource = (ACPI_RESOURCE *)srsbuf.Pointer; |
939 | end = (ACPI_RESOURCE *)((char *)srsbuf.Pointer + srsbuf.Length); |
940 | for (;;) { |
941 | if (resource->Type == ACPI_RESOURCE_TYPE_END_TAG) |
942 | break; |
943 | switch (resource->Type) { |
944 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
945 | is_ext = 1; |
946 | /* FALLTHROUGH */ |
947 | case ACPI_RESOURCE_TYPE_IRQ: |
948 | /* |
949 | * Only configure the interrupt and update the |
950 | * weights if this link has a valid IRQ and was |
951 | * previously unrouted. |
952 | */ |
953 | if (!link->l_routed && |
954 | PCI_INTERRUPT_VALID(link->l_irq)) { |
955 | *trig = is_ext ? |
956 | resource->Data.ExtendedIrq.Triggering : |
957 | resource->Data.Irq.Triggering; |
958 | *pol = is_ext ? |
959 | resource->Data.ExtendedIrq.Polarity : |
960 | resource->Data.Irq.Polarity; |
961 | *irq = is_ext ? |
962 | resource->Data.ExtendedIrq.Interrupts[0] : |
963 | resource->Data.Irq.Interrupts[0]; |
964 | link->l_routed = TRUE; |
965 | pci_link_interrupt_weights[link->l_irq] += |
966 | link->l_references; |
967 | } |
968 | link++; |
969 | i++; |
970 | break; |
971 | } |
972 | resource = ACPI_NEXT_RESOURCE(resource); |
973 | if (resource >= end) |
974 | break; |
975 | } |
976 | ACPI_FREE(srsbuf.Pointer); |
977 | return (AE_OK); |
978 | } |
979 | |
980 | /* |
981 | * Pick an IRQ to use for this unrouted link. |
982 | */ |
983 | static uint8_t |
984 | acpi_pci_link_choose_irq(struct acpi_pci_link_softc *sc, struct link *link) |
985 | { |
986 | u_int8_t best_irq, pos_irq; |
987 | int best_weight, pos_weight, i; |
988 | |
989 | KASSERT(!link->l_routed); |
990 | KASSERT(!PCI_INTERRUPT_VALID(link->l_irq)); |
991 | |
992 | /* |
993 | * If we have a valid BIOS IRQ, use that. We trust what the BIOS |
994 | * says it routed over what _CRS says the link thinks is routed. |
995 | */ |
996 | if (PCI_INTERRUPT_VALID(link->l_bios_irq)) |
997 | return (link->l_bios_irq); |
998 | |
999 | /* |
1000 | * If we don't have a BIOS IRQ but do have a valid IRQ from _CRS, |
1001 | * then use that. |
1002 | */ |
1003 | if (PCI_INTERRUPT_VALID(link->l_initial_irq)) |
1004 | return (link->l_initial_irq); |
1005 | |
1006 | /* |
1007 | * Ok, we have no useful hints, so we have to pick from the |
1008 | * possible IRQs. For ISA IRQs we only use interrupts that |
1009 | * have already been used by the BIOS. |
1010 | */ |
1011 | best_irq = PCI_INVALID_IRQ; |
1012 | best_weight = INT_MAX; |
1013 | for (i = 0; i < link->l_num_irqs; i++) { |
1014 | pos_irq = link->l_irqs[i]; |
1015 | if (pos_irq < NUM_ISA_INTERRUPTS && |
1016 | (pci_link_bios_isa_irqs & 1 << pos_irq) == 0) |
1017 | continue; |
1018 | pos_weight = pci_link_interrupt_weights[pos_irq]; |
1019 | if (pos_weight < best_weight) { |
1020 | best_weight = pos_weight; |
1021 | best_irq = pos_irq; |
1022 | } |
1023 | } |
1024 | |
1025 | /* |
1026 | * If this is an ISA IRQ, try using the SCI if it is also an ISA |
1027 | * interrupt as a fallback. |
1028 | */ |
1029 | if (link->l_isa_irq && !PCI_INTERRUPT_VALID(best_irq)) { |
1030 | pos_irq = AcpiGbl_FADT.SciInterrupt; |
1031 | pos_weight = pci_link_interrupt_weights[pos_irq]; |
1032 | if (pos_weight < best_weight) { |
1033 | best_weight = pos_weight; |
1034 | best_irq = pos_irq; |
1035 | } |
1036 | } |
1037 | |
1038 | if (PCI_INTERRUPT_VALID(best_irq)) { |
1039 | aprint_verbose("%s: Picked IRQ %u with weight %d\n" , |
1040 | sc->pl_name, best_irq, best_weight); |
1041 | } else |
1042 | printf("%s: Unable to choose an IRQ\n" , sc->pl_name); |
1043 | return (best_irq); |
1044 | } |
1045 | |
1046 | int |
1047 | acpi_pci_link_route_interrupt(void *v, int index, int *irq, int *pol, int *trig) |
1048 | { |
1049 | struct acpi_pci_link_softc *sc = v; |
1050 | struct link *link; |
1051 | int i; |
1052 | pcireg_t reg; |
1053 | |
1054 | ACPI_SERIAL_BEGIN(pci_link); |
1055 | link = acpi_pci_link_lookup(sc, index); |
1056 | if (link == NULL) |
1057 | panic("%s: apparently invalid index %d" , __func__, index); |
1058 | |
1059 | /* |
1060 | * If this link device is already routed to an interrupt, just return |
1061 | * the interrupt it is routed to. |
1062 | */ |
1063 | if (link->l_routed) { |
1064 | KASSERT(PCI_INTERRUPT_VALID(link->l_irq)); |
1065 | ACPI_SERIAL_END(pci_link); |
1066 | *irq = link->l_irq; |
1067 | *pol = link->l_pol; |
1068 | *trig = link->l_trig; |
1069 | return (link->l_irq); |
1070 | } |
1071 | |
1072 | /* Choose an IRQ if we need one. */ |
1073 | if (PCI_INTERRUPT_VALID(link->l_irq)) { |
1074 | *irq = link->l_irq; |
1075 | *pol = link->l_pol; |
1076 | *trig = link->l_trig; |
1077 | goto done; |
1078 | } |
1079 | |
1080 | link->l_irq = acpi_pci_link_choose_irq(sc, link); |
1081 | |
1082 | /* |
1083 | * Try to route the interrupt we picked. If it fails, then |
1084 | * assume the interrupt is not routed. |
1085 | */ |
1086 | if (!PCI_INTERRUPT_VALID(link->l_irq)) |
1087 | goto done; |
1088 | |
1089 | acpi_pci_link_route_irqs(sc, irq, pol, trig); |
1090 | if (!link->l_routed) { |
1091 | link->l_irq = PCI_INVALID_IRQ; |
1092 | goto done; |
1093 | } |
1094 | |
1095 | link->l_pol = *pol; |
1096 | link->l_trig = *trig; |
1097 | for (i = 0; i < link->l_dev_count; ++i) { |
1098 | reg = pci_conf_read(acpi_softc->sc_pc, link->l_devices[i], |
1099 | PCI_INTERRUPT_REG); |
1100 | reg &= ~(PCI_INTERRUPT_LINE_MASK << PCI_INTERRUPT_LINE_SHIFT); |
1101 | reg |= link->l_irq << PCI_INTERRUPT_LINE_SHIFT; |
1102 | pci_conf_write(acpi_softc->sc_pc, link->l_devices[i], |
1103 | PCI_INTERRUPT_REG, reg); |
1104 | } |
1105 | |
1106 | done: |
1107 | ACPI_SERIAL_END(pci_link); |
1108 | |
1109 | return (link->l_irq); |
1110 | } |
1111 | |
1112 | /* |
1113 | * This is gross, but we abuse the identify routine to perform one-time |
1114 | * SYSINIT() style initialization for the driver. |
1115 | */ |
1116 | static void |
1117 | acpi_pci_link_init(struct acpi_pci_link_softc *sc) |
1118 | { |
1119 | ACPI_BUFFER buf; |
1120 | |
1121 | /* |
1122 | * If the SCI is an ISA IRQ, add it to the bitmask of known good |
1123 | * ISA IRQs. |
1124 | * |
1125 | * XXX: If we are using the APIC, the SCI might have been |
1126 | * rerouted to an APIC pin in which case this is invalid. However, |
1127 | * if we are using the APIC, we also shouldn't be having any PCI |
1128 | * interrupts routed via ISA IRQs, so this is probably ok. |
1129 | */ |
1130 | if (AcpiGbl_FADT.SciInterrupt < NUM_ISA_INTERRUPTS) |
1131 | pci_link_bios_isa_irqs |= (1 << AcpiGbl_FADT.SciInterrupt); |
1132 | |
1133 | buf.Length = sizeof (sc->pl_name); |
1134 | buf.Pointer = sc->pl_name; |
1135 | |
1136 | if (ACPI_FAILURE(AcpiGetName(sc->pl_handle, ACPI_SINGLE_NAME, &buf))) |
1137 | snprintf(sc->pl_name, sizeof (sc->pl_name), "%s" , |
1138 | "ACPI link device" ); |
1139 | |
1140 | acpi_pci_link_attach(sc); |
1141 | } |
1142 | |
1143 | void * |
1144 | acpi_pci_link_devbyhandle(ACPI_HANDLE handle) |
1145 | { |
1146 | struct acpi_pci_link_softc *sc; |
1147 | |
1148 | TAILQ_FOREACH(sc, &acpi_pci_linkdevs, pl_list) { |
1149 | if (sc->pl_handle == handle) |
1150 | return sc; |
1151 | } |
1152 | |
1153 | sc = malloc(sizeof (*sc), M_ACPI, M_NOWAIT | M_ZERO); |
1154 | if (sc == NULL) |
1155 | return NULL; |
1156 | |
1157 | sc->pl_handle = handle; |
1158 | |
1159 | acpi_pci_link_init(sc); |
1160 | |
1161 | TAILQ_INSERT_TAIL(&acpi_pci_linkdevs, sc, pl_list); |
1162 | |
1163 | return (void *)sc; |
1164 | } |
1165 | |
1166 | void |
1167 | acpi_pci_link_resume(void) |
1168 | { |
1169 | struct acpi_pci_link_softc *sc; |
1170 | ACPI_BUFFER srsbuf; |
1171 | |
1172 | TAILQ_FOREACH(sc, &acpi_pci_linkdevs, pl_list) { |
1173 | ACPI_SERIAL_BEGIN(pci_link); |
1174 | if (ACPI_SUCCESS(acpi_pci_link_srs(sc, &srsbuf))) |
1175 | ACPI_FREE(srsbuf.Pointer); |
1176 | ACPI_SERIAL_END(pci_link); |
1177 | } |
1178 | } |
1179 | |
1180 | ACPI_HANDLE |
1181 | acpi_pci_link_handle(void *v) |
1182 | { |
1183 | struct acpi_pci_link_softc *sc = v; |
1184 | |
1185 | return sc->pl_handle; |
1186 | } |
1187 | |
1188 | char * |
1189 | acpi_pci_link_name(void *v) |
1190 | { |
1191 | struct acpi_pci_link_softc *sc = v; |
1192 | |
1193 | return sc->pl_name; |
1194 | } |
1195 | |
1196 | |
1197 | /* |
1198 | * Append an ACPI_RESOURCE to an ACPI_BUFFER. |
1199 | * |
1200 | * Given a pointer to an ACPI_RESOURCE structure, expand the ACPI_BUFFER |
1201 | * provided to contain it. If the ACPI_BUFFER is empty, allocate a sensible |
1202 | * backing block. If the ACPI_RESOURCE is NULL, return an empty set of |
1203 | * resources. |
1204 | */ |
1205 | #define ACPI_INITIAL_RESOURCE_BUFFER_SIZE 512 |
1206 | |
1207 | static ACPI_STATUS |
1208 | acpi_AppendBufferResource(ACPI_BUFFER *buf, ACPI_RESOURCE *res) |
1209 | { |
1210 | ACPI_RESOURCE *rp; |
1211 | void *newp; |
1212 | |
1213 | /* Initialise the buffer if necessary. */ |
1214 | if (buf->Pointer == NULL) { |
1215 | buf->Length = ACPI_INITIAL_RESOURCE_BUFFER_SIZE; |
1216 | if ((buf->Pointer = ACPI_ALLOCATE(buf->Length)) == NULL) |
1217 | return (AE_NO_MEMORY); |
1218 | rp = (ACPI_RESOURCE *)buf->Pointer; |
1219 | rp->Type = ACPI_RESOURCE_TYPE_END_TAG; |
1220 | rp->Length = 0; |
1221 | } |
1222 | |
1223 | if (res == NULL) |
1224 | return (AE_OK); |
1225 | |
1226 | /* |
1227 | * Scan the current buffer looking for the terminator. |
1228 | * This will either find the terminator or hit the end |
1229 | * of the buffer and return an error. |
1230 | */ |
1231 | rp = (ACPI_RESOURCE *)buf->Pointer; |
1232 | for (;;) { |
1233 | /* Range check, don't go outside the buffer */ |
1234 | if (rp >= (ACPI_RESOURCE *)((u_int8_t *)buf->Pointer + |
1235 | buf->Length)) |
1236 | return (AE_BAD_PARAMETER); |
1237 | if (rp->Type == ACPI_RESOURCE_TYPE_END_TAG || rp->Length == 0) |
1238 | break; |
1239 | rp = ACPI_NEXT_RESOURCE(rp); |
1240 | } |
1241 | |
1242 | /* |
1243 | * Check the size of the buffer and expand if required. |
1244 | * |
1245 | * Required size is: |
1246 | * size of existing resources before terminator + |
1247 | * size of new resource and header + |
1248 | * size of terminator. |
1249 | * |
1250 | * Note that this loop should really only run once, unless |
1251 | * for some reason we are stuffing a *really* huge resource. |
1252 | */ |
1253 | while ((((u_int8_t *)rp - (u_int8_t *)buf->Pointer) + |
1254 | res->Length + ACPI_RS_SIZE_NO_DATA + |
1255 | ACPI_RS_SIZE_MIN) >= buf->Length) { |
1256 | if ((newp = ACPI_ALLOCATE(buf->Length * 2)) == NULL) |
1257 | return (AE_NO_MEMORY); |
1258 | memcpy(newp, buf->Pointer, buf->Length); |
1259 | rp = (ACPI_RESOURCE *)((u_int8_t *)newp + |
1260 | ((u_int8_t *)rp - (u_int8_t *)buf->Pointer)); |
1261 | ACPI_FREE(buf->Pointer); |
1262 | buf->Pointer = newp; |
1263 | buf->Length += buf->Length; |
1264 | } |
1265 | |
1266 | /* Insert the new resource. */ |
1267 | memcpy(rp, res, res->Length); |
1268 | |
1269 | /* And add the terminator. */ |
1270 | rp = ACPI_NEXT_RESOURCE(rp); |
1271 | rp->Type = ACPI_RESOURCE_TYPE_END_TAG; |
1272 | rp->Length = 0; |
1273 | |
1274 | return (AE_OK); |
1275 | } |
1276 | |