pci_link.c 24 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $)
  4. *
  5. * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
  6. * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
  7. * Copyright (C) 2002 Dominik Brodowski <devel@brodo.de>
  8. *
  9. * TBD:
  10. * 1. Support more than one IRQ resource entry per link device (index).
  11. * 2. Implement start/stop mechanism and use ACPI Bus Driver facilities
  12. * for IRQ management (e.g. start()->_SRS).
  13. */
  14. #include <linux/syscore_ops.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/mutex.h>
  23. #include <linux/slab.h>
  24. #include <linux/acpi.h>
  25. #include <linux/irq.h>
  26. #include "internal.h"
  27. #define _COMPONENT ACPI_PCI_COMPONENT
  28. ACPI_MODULE_NAME("pci_link");
  29. #define ACPI_PCI_LINK_CLASS "pci_irq_routing"
  30. #define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link"
  31. #define ACPI_PCI_LINK_MAX_POSSIBLE 16
  32. static int acpi_pci_link_add(struct acpi_device *device,
  33. const struct acpi_device_id *not_used);
  34. static void acpi_pci_link_remove(struct acpi_device *device);
  35. static const struct acpi_device_id link_device_ids[] = {
  36. {"PNP0C0F", 0},
  37. {"", 0},
  38. };
  39. static struct acpi_scan_handler pci_link_handler = {
  40. .ids = link_device_ids,
  41. .attach = acpi_pci_link_add,
  42. .detach = acpi_pci_link_remove,
  43. };
  44. /*
  45. * If a link is initialized, we never change its active and initialized
  46. * later even the link is disable. Instead, we just repick the active irq
  47. */
  48. struct acpi_pci_link_irq {
  49. u32 active; /* Current IRQ */
  50. u8 triggering; /* All IRQs */
  51. u8 polarity; /* All IRQs */
  52. u8 resource_type;
  53. u8 possible_count;
  54. u32 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
  55. u8 initialized:1;
  56. u8 reserved:7;
  57. };
  58. struct acpi_pci_link {
  59. struct list_head list;
  60. struct acpi_device *device;
  61. struct acpi_pci_link_irq irq;
  62. int refcnt;
  63. };
  64. static LIST_HEAD(acpi_link_list);
  65. static DEFINE_MUTEX(acpi_link_lock);
  66. static int sci_irq = -1, sci_penalty;
  67. /* --------------------------------------------------------------------------
  68. PCI Link Device Management
  69. -------------------------------------------------------------------------- */
  70. /*
  71. * set context (link) possible list from resource list
  72. */
  73. static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource,
  74. void *context)
  75. {
  76. struct acpi_pci_link *link = context;
  77. u32 i;
  78. switch (resource->type) {
  79. case ACPI_RESOURCE_TYPE_START_DEPENDENT:
  80. case ACPI_RESOURCE_TYPE_END_TAG:
  81. return AE_OK;
  82. case ACPI_RESOURCE_TYPE_IRQ:
  83. {
  84. struct acpi_resource_irq *p = &resource->data.irq;
  85. if (!p || !p->interrupt_count) {
  86. ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  87. "Blank _PRS IRQ resource\n"));
  88. return AE_OK;
  89. }
  90. for (i = 0;
  91. (i < p->interrupt_count
  92. && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
  93. if (!p->interrupts[i]) {
  94. printk(KERN_WARNING PREFIX
  95. "Invalid _PRS IRQ %d\n",
  96. p->interrupts[i]);
  97. continue;
  98. }
  99. link->irq.possible[i] = p->interrupts[i];
  100. link->irq.possible_count++;
  101. }
  102. link->irq.triggering = p->triggering;
  103. link->irq.polarity = p->polarity;
  104. link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;
  105. break;
  106. }
  107. case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
  108. {
  109. struct acpi_resource_extended_irq *p =
  110. &resource->data.extended_irq;
  111. if (!p || !p->interrupt_count) {
  112. printk(KERN_WARNING PREFIX
  113. "Blank _PRS EXT IRQ resource\n");
  114. return AE_OK;
  115. }
  116. for (i = 0;
  117. (i < p->interrupt_count
  118. && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
  119. if (!p->interrupts[i]) {
  120. printk(KERN_WARNING PREFIX
  121. "Invalid _PRS IRQ %d\n",
  122. p->interrupts[i]);
  123. continue;
  124. }
  125. link->irq.possible[i] = p->interrupts[i];
  126. link->irq.possible_count++;
  127. }
  128. link->irq.triggering = p->triggering;
  129. link->irq.polarity = p->polarity;
  130. link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
  131. break;
  132. }
  133. default:
  134. printk(KERN_ERR PREFIX "_PRS resource type 0x%x isn't an IRQ\n",
  135. resource->type);
  136. return AE_OK;
  137. }
  138. return AE_CTRL_TERMINATE;
  139. }
  140. static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
  141. {
  142. acpi_status status;
  143. status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS,
  144. acpi_pci_link_check_possible, link);
  145. if (ACPI_FAILURE(status)) {
  146. acpi_handle_debug(link->device->handle, "_PRS not present or invalid");
  147. return 0;
  148. }
  149. ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  150. "Found %d possible IRQs\n",
  151. link->irq.possible_count));
  152. return 0;
  153. }
  154. static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource,
  155. void *context)
  156. {
  157. int *irq = context;
  158. switch (resource->type) {
  159. case ACPI_RESOURCE_TYPE_START_DEPENDENT:
  160. case ACPI_RESOURCE_TYPE_END_TAG:
  161. return AE_OK;
  162. case ACPI_RESOURCE_TYPE_IRQ:
  163. {
  164. struct acpi_resource_irq *p = &resource->data.irq;
  165. if (!p || !p->interrupt_count) {
  166. /*
  167. * IRQ descriptors may have no IRQ# bits set,
  168. * particularly those those w/ _STA disabled
  169. */
  170. ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  171. "Blank _CRS IRQ resource\n"));
  172. return AE_OK;
  173. }
  174. *irq = p->interrupts[0];
  175. break;
  176. }
  177. case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
  178. {
  179. struct acpi_resource_extended_irq *p =
  180. &resource->data.extended_irq;
  181. if (!p || !p->interrupt_count) {
  182. /*
  183. * extended IRQ descriptors must
  184. * return at least 1 IRQ
  185. */
  186. printk(KERN_WARNING PREFIX
  187. "Blank _CRS EXT IRQ resource\n");
  188. return AE_OK;
  189. }
  190. *irq = p->interrupts[0];
  191. break;
  192. }
  193. break;
  194. default:
  195. printk(KERN_ERR PREFIX "_CRS resource type 0x%x isn't an IRQ\n",
  196. resource->type);
  197. return AE_OK;
  198. }
  199. return AE_CTRL_TERMINATE;
  200. }
  201. /*
  202. * Run _CRS and set link->irq.active
  203. *
  204. * return value:
  205. * 0 - success
  206. * !0 - failure
  207. */
  208. static int acpi_pci_link_get_current(struct acpi_pci_link *link)
  209. {
  210. int result = 0;
  211. acpi_status status;
  212. int irq = 0;
  213. link->irq.active = 0;
  214. /* in practice, status disabled is meaningless, ignore it */
  215. if (acpi_strict) {
  216. /* Query _STA, set link->device->status */
  217. result = acpi_bus_get_status(link->device);
  218. if (result) {
  219. printk(KERN_ERR PREFIX "Unable to read status\n");
  220. goto end;
  221. }
  222. if (!link->device->status.enabled) {
  223. ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
  224. return 0;
  225. }
  226. }
  227. /*
  228. * Query and parse _CRS to get the current IRQ assignment.
  229. */
  230. status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS,
  231. acpi_pci_link_check_current, &irq);
  232. if (ACPI_FAILURE(status)) {
  233. ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS"));
  234. result = -ENODEV;
  235. goto end;
  236. }
  237. if (acpi_strict && !irq) {
  238. printk(KERN_ERR PREFIX "_CRS returned 0\n");
  239. result = -ENODEV;
  240. }
  241. link->irq.active = irq;
  242. ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
  243. end:
  244. return result;
  245. }
  246. static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
  247. {
  248. int result;
  249. acpi_status status;
  250. struct {
  251. struct acpi_resource res;
  252. struct acpi_resource end;
  253. } *resource;
  254. struct acpi_buffer buffer = { 0, NULL };
  255. if (!irq)
  256. return -EINVAL;
  257. resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
  258. if (!resource)
  259. return -ENOMEM;
  260. buffer.length = sizeof(*resource) + 1;
  261. buffer.pointer = resource;
  262. switch (link->irq.resource_type) {
  263. case ACPI_RESOURCE_TYPE_IRQ:
  264. resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
  265. resource->res.length = sizeof(struct acpi_resource);
  266. resource->res.data.irq.triggering = link->irq.triggering;
  267. resource->res.data.irq.polarity =
  268. link->irq.polarity;
  269. if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
  270. resource->res.data.irq.shareable =
  271. ACPI_EXCLUSIVE;
  272. else
  273. resource->res.data.irq.shareable = ACPI_SHARED;
  274. resource->res.data.irq.interrupt_count = 1;
  275. resource->res.data.irq.interrupts[0] = irq;
  276. break;
  277. case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
  278. resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
  279. resource->res.length = sizeof(struct acpi_resource);
  280. resource->res.data.extended_irq.producer_consumer =
  281. ACPI_CONSUMER;
  282. resource->res.data.extended_irq.triggering =
  283. link->irq.triggering;
  284. resource->res.data.extended_irq.polarity =
  285. link->irq.polarity;
  286. if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
  287. resource->res.data.extended_irq.shareable =
  288. ACPI_EXCLUSIVE;
  289. else
  290. resource->res.data.extended_irq.shareable = ACPI_SHARED;
  291. resource->res.data.extended_irq.interrupt_count = 1;
  292. resource->res.data.extended_irq.interrupts[0] = irq;
  293. /* ignore resource_source, it's optional */
  294. break;
  295. default:
  296. printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type);
  297. result = -EINVAL;
  298. goto end;
  299. }
  300. resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;
  301. resource->end.length = sizeof(struct acpi_resource);
  302. /* Attempt to set the resource */
  303. status = acpi_set_current_resources(link->device->handle, &buffer);
  304. /* check for total failure */
  305. if (ACPI_FAILURE(status)) {
  306. ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS"));
  307. result = -ENODEV;
  308. goto end;
  309. }
  310. /* Query _STA, set device->status */
  311. result = acpi_bus_get_status(link->device);
  312. if (result) {
  313. printk(KERN_ERR PREFIX "Unable to read status\n");
  314. goto end;
  315. }
  316. if (!link->device->status.enabled) {
  317. printk(KERN_WARNING PREFIX
  318. "%s [%s] disabled and referenced, BIOS bug\n",
  319. acpi_device_name(link->device),
  320. acpi_device_bid(link->device));
  321. }
  322. /* Query _CRS, set link->irq.active */
  323. result = acpi_pci_link_get_current(link);
  324. if (result) {
  325. goto end;
  326. }
  327. /*
  328. * Is current setting not what we set?
  329. * set link->irq.active
  330. */
  331. if (link->irq.active != irq) {
  332. /*
  333. * policy: when _CRS doesn't return what we just _SRS
  334. * assume _SRS worked and override _CRS value.
  335. */
  336. printk(KERN_WARNING PREFIX
  337. "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
  338. acpi_device_name(link->device),
  339. acpi_device_bid(link->device), link->irq.active, irq);
  340. link->irq.active = irq;
  341. }
  342. ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
  343. end:
  344. kfree(resource);
  345. return result;
  346. }
  347. /* --------------------------------------------------------------------------
  348. PCI Link IRQ Management
  349. -------------------------------------------------------------------------- */
  350. /*
  351. * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
  352. * Link Devices to move the PIRQs around to minimize sharing.
  353. *
  354. * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
  355. * that the BIOS has already set to active. This is necessary because
  356. * ACPI has no automatic means of knowing what ISA IRQs are used. Note that
  357. * if the BIOS doesn't set a Link Device active, ACPI needs to program it
  358. * even if acpi_irq_nobalance is set.
  359. *
  360. * A tables of penalties avoids directing PCI interrupts to well known
  361. * ISA IRQs. Boot params are available to over-ride the default table:
  362. *
  363. * List interrupts that are free for PCI use.
  364. * acpi_irq_pci=n[,m]
  365. *
  366. * List interrupts that should not be used for PCI:
  367. * acpi_irq_isa=n[,m]
  368. *
  369. * Note that PCI IRQ routers have a list of possible IRQs,
  370. * which may not include the IRQs this table says are available.
  371. *
  372. * Since this heuristic can't tell the difference between a link
  373. * that no device will attach to, vs. a link which may be shared
  374. * by multiple active devices -- it is not optimal.
  375. *
  376. * If interrupt performance is that important, get an IO-APIC system
  377. * with a pin dedicated to each device. Or for that matter, an MSI
  378. * enabled system.
  379. */
  380. #define ACPI_MAX_ISA_IRQS 16
  381. #define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
  382. #define PIRQ_PENALTY_PCI_USING (16*16*16)
  383. #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
  384. #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
  385. #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
  386. static int acpi_isa_irq_penalty[ACPI_MAX_ISA_IRQS] = {
  387. PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */
  388. PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */
  389. PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */
  390. PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */
  391. PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */
  392. PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */
  393. PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
  394. PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
  395. PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
  396. 0, /* IRQ9 PCI, often acpi */
  397. 0, /* IRQ10 PCI */
  398. 0, /* IRQ11 PCI */
  399. PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
  400. PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
  401. PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
  402. PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */
  403. /* >IRQ15 */
  404. };
  405. static int acpi_irq_pci_sharing_penalty(int irq)
  406. {
  407. struct acpi_pci_link *link;
  408. int penalty = 0;
  409. int i;
  410. list_for_each_entry(link, &acpi_link_list, list) {
  411. /*
  412. * If a link is active, penalize its IRQ heavily
  413. * so we try to choose a different IRQ.
  414. */
  415. if (link->irq.active && link->irq.active == irq)
  416. penalty += PIRQ_PENALTY_PCI_USING;
  417. /*
  418. * penalize the IRQs PCI might use, but not as severely.
  419. */
  420. for (i = 0; i < link->irq.possible_count; i++)
  421. if (link->irq.possible[i] == irq)
  422. penalty += PIRQ_PENALTY_PCI_POSSIBLE /
  423. link->irq.possible_count;
  424. }
  425. return penalty;
  426. }
  427. static int acpi_irq_get_penalty(int irq)
  428. {
  429. int penalty = 0;
  430. if (irq == sci_irq)
  431. penalty += sci_penalty;
  432. if (irq < ACPI_MAX_ISA_IRQS)
  433. return penalty + acpi_isa_irq_penalty[irq];
  434. return penalty + acpi_irq_pci_sharing_penalty(irq);
  435. }
  436. int __init acpi_irq_penalty_init(void)
  437. {
  438. struct acpi_pci_link *link;
  439. int i;
  440. /*
  441. * Update penalties to facilitate IRQ balancing.
  442. */
  443. list_for_each_entry(link, &acpi_link_list, list) {
  444. /*
  445. * reflect the possible and active irqs in the penalty table --
  446. * useful for breaking ties.
  447. */
  448. if (link->irq.possible_count) {
  449. int penalty =
  450. PIRQ_PENALTY_PCI_POSSIBLE /
  451. link->irq.possible_count;
  452. for (i = 0; i < link->irq.possible_count; i++) {
  453. if (link->irq.possible[i] < ACPI_MAX_ISA_IRQS)
  454. acpi_isa_irq_penalty[link->irq.
  455. possible[i]] +=
  456. penalty;
  457. }
  458. } else if (link->irq.active &&
  459. (link->irq.active < ACPI_MAX_ISA_IRQS)) {
  460. acpi_isa_irq_penalty[link->irq.active] +=
  461. PIRQ_PENALTY_PCI_POSSIBLE;
  462. }
  463. }
  464. return 0;
  465. }
  466. static int acpi_irq_balance = -1; /* 0: static, 1: balance */
  467. static int acpi_pci_link_allocate(struct acpi_pci_link *link)
  468. {
  469. int irq;
  470. int i;
  471. if (link->irq.initialized) {
  472. if (link->refcnt == 0)
  473. /* This means the link is disabled but initialized */
  474. acpi_pci_link_set(link, link->irq.active);
  475. return 0;
  476. }
  477. /*
  478. * search for active IRQ in list of possible IRQs.
  479. */
  480. for (i = 0; i < link->irq.possible_count; ++i) {
  481. if (link->irq.active == link->irq.possible[i])
  482. break;
  483. }
  484. /*
  485. * forget active IRQ that is not in possible list
  486. */
  487. if (i == link->irq.possible_count) {
  488. if (acpi_strict)
  489. printk(KERN_WARNING PREFIX "_CRS %d not found"
  490. " in _PRS\n", link->irq.active);
  491. link->irq.active = 0;
  492. }
  493. /*
  494. * if active found, use it; else pick entry from end of possible list.
  495. */
  496. if (link->irq.active)
  497. irq = link->irq.active;
  498. else
  499. irq = link->irq.possible[link->irq.possible_count - 1];
  500. if (acpi_irq_balance || !link->irq.active) {
  501. /*
  502. * Select the best IRQ. This is done in reverse to promote
  503. * the use of IRQs 9, 10, 11, and >15.
  504. */
  505. for (i = (link->irq.possible_count - 1); i >= 0; i--) {
  506. if (acpi_irq_get_penalty(irq) >
  507. acpi_irq_get_penalty(link->irq.possible[i]))
  508. irq = link->irq.possible[i];
  509. }
  510. }
  511. if (acpi_irq_get_penalty(irq) >= PIRQ_PENALTY_ISA_ALWAYS) {
  512. printk(KERN_ERR PREFIX "No IRQ available for %s [%s]. "
  513. "Try pci=noacpi or acpi=off\n",
  514. acpi_device_name(link->device),
  515. acpi_device_bid(link->device));
  516. return -ENODEV;
  517. }
  518. /* Attempt to enable the link device at this IRQ. */
  519. if (acpi_pci_link_set(link, irq)) {
  520. printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. "
  521. "Try pci=noacpi or acpi=off\n",
  522. acpi_device_name(link->device),
  523. acpi_device_bid(link->device));
  524. return -ENODEV;
  525. } else {
  526. if (link->irq.active < ACPI_MAX_ISA_IRQS)
  527. acpi_isa_irq_penalty[link->irq.active] +=
  528. PIRQ_PENALTY_PCI_USING;
  529. pr_info("%s [%s] enabled at IRQ %d\n",
  530. acpi_device_name(link->device),
  531. acpi_device_bid(link->device), link->irq.active);
  532. }
  533. link->irq.initialized = 1;
  534. return 0;
  535. }
  536. /*
  537. * acpi_pci_link_allocate_irq
  538. * success: return IRQ >= 0
  539. * failure: return -1
  540. */
  541. int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering,
  542. int *polarity, char **name)
  543. {
  544. int result;
  545. struct acpi_device *device;
  546. struct acpi_pci_link *link;
  547. result = acpi_bus_get_device(handle, &device);
  548. if (result) {
  549. printk(KERN_ERR PREFIX "Invalid link device\n");
  550. return -1;
  551. }
  552. link = acpi_driver_data(device);
  553. if (!link) {
  554. printk(KERN_ERR PREFIX "Invalid link context\n");
  555. return -1;
  556. }
  557. /* TBD: Support multiple index (IRQ) entries per Link Device */
  558. if (index) {
  559. printk(KERN_ERR PREFIX "Invalid index %d\n", index);
  560. return -1;
  561. }
  562. mutex_lock(&acpi_link_lock);
  563. if (acpi_pci_link_allocate(link)) {
  564. mutex_unlock(&acpi_link_lock);
  565. return -1;
  566. }
  567. if (!link->irq.active) {
  568. mutex_unlock(&acpi_link_lock);
  569. printk(KERN_ERR PREFIX "Link active IRQ is 0!\n");
  570. return -1;
  571. }
  572. link->refcnt++;
  573. mutex_unlock(&acpi_link_lock);
  574. if (triggering)
  575. *triggering = link->irq.triggering;
  576. if (polarity)
  577. *polarity = link->irq.polarity;
  578. if (name)
  579. *name = acpi_device_bid(link->device);
  580. ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  581. "Link %s is referenced\n",
  582. acpi_device_bid(link->device)));
  583. return link->irq.active;
  584. }
  585. /*
  586. * We don't change link's irq information here. After it is reenabled, we
  587. * continue use the info
  588. */
  589. int acpi_pci_link_free_irq(acpi_handle handle)
  590. {
  591. struct acpi_device *device;
  592. struct acpi_pci_link *link;
  593. acpi_status result;
  594. result = acpi_bus_get_device(handle, &device);
  595. if (result) {
  596. printk(KERN_ERR PREFIX "Invalid link device\n");
  597. return -1;
  598. }
  599. link = acpi_driver_data(device);
  600. if (!link) {
  601. printk(KERN_ERR PREFIX "Invalid link context\n");
  602. return -1;
  603. }
  604. mutex_lock(&acpi_link_lock);
  605. if (!link->irq.initialized) {
  606. mutex_unlock(&acpi_link_lock);
  607. printk(KERN_ERR PREFIX "Link isn't initialized\n");
  608. return -1;
  609. }
  610. #ifdef FUTURE_USE
  611. /*
  612. * The Link reference count allows us to _DISable an unused link
  613. * and suspend time, and set it again on resume.
  614. * However, 2.6.12 still has irq_router.resume
  615. * which blindly restores the link state.
  616. * So we disable the reference count method
  617. * to prevent duplicate acpi_pci_link_set()
  618. * which would harm some systems
  619. */
  620. link->refcnt--;
  621. #endif
  622. ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  623. "Link %s is dereferenced\n",
  624. acpi_device_bid(link->device)));
  625. if (link->refcnt == 0)
  626. acpi_evaluate_object(link->device->handle, "_DIS", NULL, NULL);
  627. mutex_unlock(&acpi_link_lock);
  628. return link->irq.active;
  629. }
  630. /* --------------------------------------------------------------------------
  631. Driver Interface
  632. -------------------------------------------------------------------------- */
  633. static int acpi_pci_link_add(struct acpi_device *device,
  634. const struct acpi_device_id *not_used)
  635. {
  636. int result;
  637. struct acpi_pci_link *link;
  638. int i;
  639. int found = 0;
  640. link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
  641. if (!link)
  642. return -ENOMEM;
  643. link->device = device;
  644. strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
  645. strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
  646. device->driver_data = link;
  647. mutex_lock(&acpi_link_lock);
  648. result = acpi_pci_link_get_possible(link);
  649. if (result)
  650. goto end;
  651. /* query and set link->irq.active */
  652. acpi_pci_link_get_current(link);
  653. printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device),
  654. acpi_device_bid(device));
  655. for (i = 0; i < link->irq.possible_count; i++) {
  656. if (link->irq.active == link->irq.possible[i]) {
  657. printk(KERN_CONT " *%d", link->irq.possible[i]);
  658. found = 1;
  659. } else
  660. printk(KERN_CONT " %d", link->irq.possible[i]);
  661. }
  662. printk(KERN_CONT ")");
  663. if (!found)
  664. printk(KERN_CONT " *%d", link->irq.active);
  665. if (!link->device->status.enabled)
  666. printk(KERN_CONT ", disabled.");
  667. printk(KERN_CONT "\n");
  668. list_add_tail(&link->list, &acpi_link_list);
  669. end:
  670. /* disable all links -- to be activated on use */
  671. acpi_evaluate_object(device->handle, "_DIS", NULL, NULL);
  672. mutex_unlock(&acpi_link_lock);
  673. if (result)
  674. kfree(link);
  675. return result < 0 ? result : 1;
  676. }
  677. static int acpi_pci_link_resume(struct acpi_pci_link *link)
  678. {
  679. if (link->refcnt && link->irq.active && link->irq.initialized)
  680. return (acpi_pci_link_set(link, link->irq.active));
  681. return 0;
  682. }
  683. static void irqrouter_resume(void)
  684. {
  685. struct acpi_pci_link *link;
  686. list_for_each_entry(link, &acpi_link_list, list) {
  687. acpi_pci_link_resume(link);
  688. }
  689. }
  690. static void acpi_pci_link_remove(struct acpi_device *device)
  691. {
  692. struct acpi_pci_link *link;
  693. link = acpi_driver_data(device);
  694. mutex_lock(&acpi_link_lock);
  695. list_del(&link->list);
  696. mutex_unlock(&acpi_link_lock);
  697. kfree(link);
  698. }
  699. /*
  700. * modify acpi_isa_irq_penalty[] from cmdline
  701. */
  702. static int __init acpi_irq_penalty_update(char *str, int used)
  703. {
  704. int i;
  705. for (i = 0; i < 16; i++) {
  706. int retval;
  707. int irq;
  708. int new_penalty;
  709. retval = get_option(&str, &irq);
  710. if (!retval)
  711. break; /* no number found */
  712. /* see if this is a ISA IRQ */
  713. if ((irq < 0) || (irq >= ACPI_MAX_ISA_IRQS))
  714. continue;
  715. if (used)
  716. new_penalty = acpi_isa_irq_penalty[irq] +
  717. PIRQ_PENALTY_ISA_USED;
  718. else
  719. new_penalty = 0;
  720. acpi_isa_irq_penalty[irq] = new_penalty;
  721. if (retval != 2) /* no next number */
  722. break;
  723. }
  724. return 1;
  725. }
  726. /*
  727. * We'd like PNP to call this routine for the
  728. * single ISA_USED value for each legacy device.
  729. * But instead it calls us with each POSSIBLE setting.
  730. * There is no ISA_POSSIBLE weight, so we simply use
  731. * the (small) PCI_USING penalty.
  732. */
  733. void acpi_penalize_isa_irq(int irq, int active)
  734. {
  735. if ((irq >= 0) && (irq < ARRAY_SIZE(acpi_isa_irq_penalty)))
  736. acpi_isa_irq_penalty[irq] +=
  737. (active ? PIRQ_PENALTY_ISA_USED : PIRQ_PENALTY_PCI_USING);
  738. }
  739. bool acpi_isa_irq_available(int irq)
  740. {
  741. return irq >= 0 && (irq >= ARRAY_SIZE(acpi_isa_irq_penalty) ||
  742. acpi_irq_get_penalty(irq) < PIRQ_PENALTY_ISA_ALWAYS);
  743. }
  744. void acpi_penalize_sci_irq(int irq, int trigger, int polarity)
  745. {
  746. sci_irq = irq;
  747. if (trigger == ACPI_MADT_TRIGGER_LEVEL &&
  748. polarity == ACPI_MADT_POLARITY_ACTIVE_LOW)
  749. sci_penalty = PIRQ_PENALTY_PCI_USING;
  750. else
  751. sci_penalty = PIRQ_PENALTY_ISA_ALWAYS;
  752. }
  753. /*
  754. * Over-ride default table to reserve additional IRQs for use by ISA
  755. * e.g. acpi_irq_isa=5
  756. * Useful for telling ACPI how not to interfere with your ISA sound card.
  757. */
  758. static int __init acpi_irq_isa(char *str)
  759. {
  760. return acpi_irq_penalty_update(str, 1);
  761. }
  762. __setup("acpi_irq_isa=", acpi_irq_isa);
  763. /*
  764. * Over-ride default table to free additional IRQs for use by PCI
  765. * e.g. acpi_irq_pci=7,15
  766. * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
  767. */
  768. static int __init acpi_irq_pci(char *str)
  769. {
  770. return acpi_irq_penalty_update(str, 0);
  771. }
  772. __setup("acpi_irq_pci=", acpi_irq_pci);
  773. static int __init acpi_irq_nobalance_set(char *str)
  774. {
  775. acpi_irq_balance = 0;
  776. return 1;
  777. }
  778. __setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
  779. static int __init acpi_irq_balance_set(char *str)
  780. {
  781. acpi_irq_balance = 1;
  782. return 1;
  783. }
  784. __setup("acpi_irq_balance", acpi_irq_balance_set);
  785. static struct syscore_ops irqrouter_syscore_ops = {
  786. .resume = irqrouter_resume,
  787. };
  788. void __init acpi_pci_link_init(void)
  789. {
  790. if (acpi_noirq)
  791. return;
  792. if (acpi_irq_balance == -1) {
  793. /* no command line switch: enable balancing in IOAPIC mode */
  794. if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC)
  795. acpi_irq_balance = 1;
  796. else
  797. acpi_irq_balance = 0;
  798. }
  799. register_syscore_ops(&irqrouter_syscore_ops);
  800. acpi_scan_add_handler(&pci_link_handler);
  801. }