Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $) | |
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 | * | |
8 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or (at | |
13 | * your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, but | |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License along | |
21 | * with this program; if not, write to the Free Software Foundation, Inc., | |
22 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
23 | * | |
24 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
25 | * | |
26 | * TBD: | |
27 | * 1. Support more than one IRQ resource entry per link device (index). | |
28 | * 2. Implement start/stop mechanism and use ACPI Bus Driver facilities | |
29 | * for IRQ management (e.g. start()->_SRS). | |
30 | */ | |
31 | ||
32 | #include <linux/sysdev.h> | |
33 | #include <linux/kernel.h> | |
34 | #include <linux/module.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/types.h> | |
37 | #include <linux/proc_fs.h> | |
38 | #include <linux/spinlock.h> | |
39 | #include <linux/pm.h> | |
40 | #include <linux/pci.h> | |
41 | ||
42 | #include <acpi/acpi_bus.h> | |
43 | #include <acpi/acpi_drivers.h> | |
44 | ||
1da177e4 | 45 | #define _COMPONENT ACPI_PCI_COMPONENT |
4be44fcd | 46 | ACPI_MODULE_NAME("pci_link") |
1da177e4 LT |
47 | #define ACPI_PCI_LINK_CLASS "pci_irq_routing" |
48 | #define ACPI_PCI_LINK_HID "PNP0C0F" | |
49 | #define ACPI_PCI_LINK_DRIVER_NAME "ACPI PCI Interrupt Link Driver" | |
50 | #define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link" | |
51 | #define ACPI_PCI_LINK_FILE_INFO "info" | |
52 | #define ACPI_PCI_LINK_FILE_STATUS "state" | |
1da177e4 | 53 | #define ACPI_PCI_LINK_MAX_POSSIBLE 16 |
4be44fcd LB |
54 | static int acpi_pci_link_add(struct acpi_device *device); |
55 | static int acpi_pci_link_remove(struct acpi_device *device, int type); | |
1da177e4 LT |
56 | |
57 | static struct acpi_driver acpi_pci_link_driver = { | |
4be44fcd LB |
58 | .name = ACPI_PCI_LINK_DRIVER_NAME, |
59 | .class = ACPI_PCI_LINK_CLASS, | |
60 | .ids = ACPI_PCI_LINK_HID, | |
61 | .ops = { | |
62 | .add = acpi_pci_link_add, | |
63 | .remove = acpi_pci_link_remove, | |
64 | }, | |
1da177e4 LT |
65 | }; |
66 | ||
87bec66b DSL |
67 | /* |
68 | * If a link is initialized, we never change its active and initialized | |
69 | * later even the link is disable. Instead, we just repick the active irq | |
70 | */ | |
1da177e4 | 71 | struct acpi_pci_link_irq { |
4be44fcd LB |
72 | u8 active; /* Current IRQ */ |
73 | u8 edge_level; /* All IRQs */ | |
74 | u8 active_high_low; /* All IRQs */ | |
75 | u8 resource_type; | |
76 | u8 possible_count; | |
77 | u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE]; | |
78 | u8 initialized:1; | |
79 | u8 reserved:7; | |
1da177e4 LT |
80 | }; |
81 | ||
82 | struct acpi_pci_link { | |
4be44fcd LB |
83 | struct list_head node; |
84 | struct acpi_device *device; | |
85 | acpi_handle handle; | |
1da177e4 | 86 | struct acpi_pci_link_irq irq; |
4be44fcd | 87 | int refcnt; |
1da177e4 LT |
88 | }; |
89 | ||
90 | static struct { | |
4be44fcd LB |
91 | int count; |
92 | struct list_head entries; | |
93 | } acpi_link; | |
87bec66b | 94 | DECLARE_MUTEX(acpi_link_lock); |
1da177e4 | 95 | |
1da177e4 LT |
96 | /* -------------------------------------------------------------------------- |
97 | PCI Link Device Management | |
98 | -------------------------------------------------------------------------- */ | |
99 | ||
100 | /* | |
101 | * set context (link) possible list from resource list | |
102 | */ | |
103 | static acpi_status | |
4be44fcd | 104 | acpi_pci_link_check_possible(struct acpi_resource *resource, void *context) |
1da177e4 | 105 | { |
4be44fcd LB |
106 | struct acpi_pci_link *link = (struct acpi_pci_link *)context; |
107 | u32 i = 0; | |
1da177e4 LT |
108 | |
109 | ACPI_FUNCTION_TRACE("acpi_pci_link_check_possible"); | |
110 | ||
111 | switch (resource->id) { | |
112 | case ACPI_RSTYPE_START_DPF: | |
113 | return_ACPI_STATUS(AE_OK); | |
114 | case ACPI_RSTYPE_IRQ: | |
4be44fcd LB |
115 | { |
116 | struct acpi_resource_irq *p = &resource->data.irq; | |
117 | if (!p || !p->number_of_interrupts) { | |
118 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, | |
119 | "Blank IRQ resource\n")); | |
120 | return_ACPI_STATUS(AE_OK); | |
1da177e4 | 121 | } |
4be44fcd LB |
122 | for (i = 0; |
123 | (i < p->number_of_interrupts | |
124 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { | |
125 | if (!p->interrupts[i]) { | |
126 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, | |
127 | "Invalid IRQ %d\n", | |
128 | p->interrupts[i])); | |
129 | continue; | |
130 | } | |
131 | link->irq.possible[i] = p->interrupts[i]; | |
132 | link->irq.possible_count++; | |
133 | } | |
134 | link->irq.edge_level = p->edge_level; | |
135 | link->irq.active_high_low = p->active_high_low; | |
136 | link->irq.resource_type = ACPI_RSTYPE_IRQ; | |
137 | break; | |
1da177e4 | 138 | } |
1da177e4 | 139 | case ACPI_RSTYPE_EXT_IRQ: |
4be44fcd LB |
140 | { |
141 | struct acpi_resource_ext_irq *p = | |
142 | &resource->data.extended_irq; | |
143 | if (!p || !p->number_of_interrupts) { | |
144 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, | |
145 | "Blank EXT IRQ resource\n")); | |
146 | return_ACPI_STATUS(AE_OK); | |
147 | } | |
148 | for (i = 0; | |
149 | (i < p->number_of_interrupts | |
150 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { | |
151 | if (!p->interrupts[i]) { | |
152 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, | |
153 | "Invalid IRQ %d\n", | |
154 | p->interrupts[i])); | |
155 | continue; | |
156 | } | |
157 | link->irq.possible[i] = p->interrupts[i]; | |
158 | link->irq.possible_count++; | |
1da177e4 | 159 | } |
4be44fcd LB |
160 | link->irq.edge_level = p->edge_level; |
161 | link->irq.active_high_low = p->active_high_low; | |
162 | link->irq.resource_type = ACPI_RSTYPE_EXT_IRQ; | |
163 | break; | |
1da177e4 | 164 | } |
1da177e4 | 165 | default: |
4be44fcd LB |
166 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
167 | "Resource is not an IRQ entry\n")); | |
1da177e4 LT |
168 | return_ACPI_STATUS(AE_OK); |
169 | } | |
170 | ||
171 | return_ACPI_STATUS(AE_CTRL_TERMINATE); | |
172 | } | |
173 | ||
4be44fcd | 174 | static int acpi_pci_link_get_possible(struct acpi_pci_link *link) |
1da177e4 | 175 | { |
4be44fcd | 176 | acpi_status status; |
1da177e4 LT |
177 | |
178 | ACPI_FUNCTION_TRACE("acpi_pci_link_get_possible"); | |
179 | ||
180 | if (!link) | |
181 | return_VALUE(-EINVAL); | |
182 | ||
183 | status = acpi_walk_resources(link->handle, METHOD_NAME__PRS, | |
4be44fcd | 184 | acpi_pci_link_check_possible, link); |
1da177e4 LT |
185 | if (ACPI_FAILURE(status)) { |
186 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRS\n")); | |
187 | return_VALUE(-ENODEV); | |
188 | } | |
189 | ||
4be44fcd LB |
190 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
191 | "Found %d possible IRQs\n", | |
192 | link->irq.possible_count)); | |
1da177e4 LT |
193 | |
194 | return_VALUE(0); | |
195 | } | |
196 | ||
1da177e4 | 197 | static acpi_status |
4be44fcd | 198 | acpi_pci_link_check_current(struct acpi_resource *resource, void *context) |
1da177e4 | 199 | { |
4be44fcd | 200 | int *irq = (int *)context; |
1da177e4 LT |
201 | |
202 | ACPI_FUNCTION_TRACE("acpi_pci_link_check_current"); | |
203 | ||
204 | switch (resource->id) { | |
205 | case ACPI_RSTYPE_IRQ: | |
4be44fcd LB |
206 | { |
207 | struct acpi_resource_irq *p = &resource->data.irq; | |
208 | if (!p || !p->number_of_interrupts) { | |
209 | /* | |
210 | * IRQ descriptors may have no IRQ# bits set, | |
211 | * particularly those those w/ _STA disabled | |
212 | */ | |
213 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
214 | "Blank IRQ resource\n")); | |
215 | return_ACPI_STATUS(AE_OK); | |
216 | } | |
217 | *irq = p->interrupts[0]; | |
218 | break; | |
1da177e4 | 219 | } |
1da177e4 | 220 | case ACPI_RSTYPE_EXT_IRQ: |
4be44fcd LB |
221 | { |
222 | struct acpi_resource_ext_irq *p = | |
223 | &resource->data.extended_irq; | |
224 | if (!p || !p->number_of_interrupts) { | |
225 | /* | |
226 | * extended IRQ descriptors must | |
227 | * return at least 1 IRQ | |
228 | */ | |
229 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, | |
230 | "Blank EXT IRQ resource\n")); | |
231 | return_ACPI_STATUS(AE_OK); | |
232 | } | |
233 | *irq = p->interrupts[0]; | |
234 | break; | |
1da177e4 | 235 | } |
1da177e4 | 236 | default: |
4be44fcd | 237 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Resource isn't an IRQ\n")); |
1da177e4 LT |
238 | return_ACPI_STATUS(AE_OK); |
239 | } | |
240 | return_ACPI_STATUS(AE_CTRL_TERMINATE); | |
241 | } | |
242 | ||
243 | /* | |
244 | * Run _CRS and set link->irq.active | |
245 | * | |
246 | * return value: | |
247 | * 0 - success | |
248 | * !0 - failure | |
249 | */ | |
4be44fcd | 250 | static int acpi_pci_link_get_current(struct acpi_pci_link *link) |
1da177e4 | 251 | { |
4be44fcd LB |
252 | int result = 0; |
253 | acpi_status status = AE_OK; | |
254 | int irq = 0; | |
1da177e4 LT |
255 | |
256 | ACPI_FUNCTION_TRACE("acpi_pci_link_get_current"); | |
257 | ||
258 | if (!link || !link->handle) | |
259 | return_VALUE(-EINVAL); | |
260 | ||
261 | link->irq.active = 0; | |
262 | ||
263 | /* in practice, status disabled is meaningless, ignore it */ | |
264 | if (acpi_strict) { | |
265 | /* Query _STA, set link->device->status */ | |
266 | result = acpi_bus_get_status(link->device); | |
267 | if (result) { | |
4be44fcd LB |
268 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
269 | "Unable to read status\n")); | |
1da177e4 LT |
270 | goto end; |
271 | } | |
272 | ||
273 | if (!link->device->status.enabled) { | |
274 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n")); | |
275 | return_VALUE(0); | |
276 | } | |
277 | } | |
278 | ||
279 | /* | |
280 | * Query and parse _CRS to get the current IRQ assignment. | |
281 | */ | |
282 | ||
283 | status = acpi_walk_resources(link->handle, METHOD_NAME__CRS, | |
4be44fcd | 284 | acpi_pci_link_check_current, &irq); |
1da177e4 LT |
285 | if (ACPI_FAILURE(status)) { |
286 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _CRS\n")); | |
287 | result = -ENODEV; | |
288 | goto end; | |
289 | } | |
290 | ||
291 | if (acpi_strict && !irq) { | |
292 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "_CRS returned 0\n")); | |
293 | result = -ENODEV; | |
294 | } | |
295 | ||
296 | link->irq.active = irq; | |
297 | ||
298 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active)); | |
299 | ||
4be44fcd | 300 | end: |
1da177e4 LT |
301 | return_VALUE(result); |
302 | } | |
303 | ||
4be44fcd | 304 | static int acpi_pci_link_set(struct acpi_pci_link *link, int irq) |
1da177e4 | 305 | { |
4be44fcd LB |
306 | int result = 0; |
307 | acpi_status status = AE_OK; | |
1da177e4 | 308 | struct { |
4be44fcd LB |
309 | struct acpi_resource res; |
310 | struct acpi_resource end; | |
311 | } *resource; | |
312 | struct acpi_buffer buffer = { 0, NULL }; | |
1da177e4 LT |
313 | |
314 | ACPI_FUNCTION_TRACE("acpi_pci_link_set"); | |
315 | ||
316 | if (!link || !irq) | |
317 | return_VALUE(-EINVAL); | |
318 | ||
4be44fcd LB |
319 | resource = kmalloc(sizeof(*resource) + 1, GFP_KERNEL); |
320 | if (!resource) | |
1da177e4 LT |
321 | return_VALUE(-ENOMEM); |
322 | ||
4be44fcd LB |
323 | memset(resource, 0, sizeof(*resource) + 1); |
324 | buffer.length = sizeof(*resource) + 1; | |
1da177e4 LT |
325 | buffer.pointer = resource; |
326 | ||
4be44fcd | 327 | switch (link->irq.resource_type) { |
1da177e4 LT |
328 | case ACPI_RSTYPE_IRQ: |
329 | resource->res.id = ACPI_RSTYPE_IRQ; | |
330 | resource->res.length = sizeof(struct acpi_resource); | |
331 | resource->res.data.irq.edge_level = link->irq.edge_level; | |
4be44fcd LB |
332 | resource->res.data.irq.active_high_low = |
333 | link->irq.active_high_low; | |
1da177e4 | 334 | if (link->irq.edge_level == ACPI_EDGE_SENSITIVE) |
4be44fcd LB |
335 | resource->res.data.irq.shared_exclusive = |
336 | ACPI_EXCLUSIVE; | |
1da177e4 LT |
337 | else |
338 | resource->res.data.irq.shared_exclusive = ACPI_SHARED; | |
339 | resource->res.data.irq.number_of_interrupts = 1; | |
340 | resource->res.data.irq.interrupts[0] = irq; | |
341 | break; | |
4be44fcd | 342 | |
1da177e4 LT |
343 | case ACPI_RSTYPE_EXT_IRQ: |
344 | resource->res.id = ACPI_RSTYPE_EXT_IRQ; | |
345 | resource->res.length = sizeof(struct acpi_resource); | |
4be44fcd LB |
346 | resource->res.data.extended_irq.producer_consumer = |
347 | ACPI_CONSUMER; | |
348 | resource->res.data.extended_irq.edge_level = | |
349 | link->irq.edge_level; | |
350 | resource->res.data.extended_irq.active_high_low = | |
351 | link->irq.active_high_low; | |
1da177e4 | 352 | if (link->irq.edge_level == ACPI_EDGE_SENSITIVE) |
4be44fcd LB |
353 | resource->res.data.irq.shared_exclusive = |
354 | ACPI_EXCLUSIVE; | |
1da177e4 LT |
355 | else |
356 | resource->res.data.irq.shared_exclusive = ACPI_SHARED; | |
357 | resource->res.data.extended_irq.number_of_interrupts = 1; | |
358 | resource->res.data.extended_irq.interrupts[0] = irq; | |
359 | /* ignore resource_source, it's optional */ | |
360 | break; | |
361 | default: | |
362 | printk("ACPI BUG: resource_type %d\n", link->irq.resource_type); | |
363 | result = -EINVAL; | |
364 | goto end; | |
365 | ||
366 | } | |
367 | resource->end.id = ACPI_RSTYPE_END_TAG; | |
368 | ||
369 | /* Attempt to set the resource */ | |
370 | status = acpi_set_current_resources(link->handle, &buffer); | |
371 | ||
372 | /* check for total failure */ | |
373 | if (ACPI_FAILURE(status)) { | |
374 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SRS\n")); | |
375 | result = -ENODEV; | |
376 | goto end; | |
377 | } | |
378 | ||
379 | /* Query _STA, set device->status */ | |
380 | result = acpi_bus_get_status(link->device); | |
381 | if (result) { | |
382 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to read status\n")); | |
383 | goto end; | |
384 | } | |
385 | if (!link->device->status.enabled) { | |
386 | printk(KERN_WARNING PREFIX | |
4be44fcd LB |
387 | "%s [%s] disabled and referenced, BIOS bug.\n", |
388 | acpi_device_name(link->device), | |
389 | acpi_device_bid(link->device)); | |
1da177e4 LT |
390 | } |
391 | ||
392 | /* Query _CRS, set link->irq.active */ | |
393 | result = acpi_pci_link_get_current(link); | |
394 | if (result) { | |
395 | goto end; | |
396 | } | |
397 | ||
398 | /* | |
399 | * Is current setting not what we set? | |
400 | * set link->irq.active | |
401 | */ | |
402 | if (link->irq.active != irq) { | |
403 | /* | |
404 | * policy: when _CRS doesn't return what we just _SRS | |
405 | * assume _SRS worked and override _CRS value. | |
406 | */ | |
4be44fcd LB |
407 | printk(KERN_WARNING PREFIX |
408 | "%s [%s] BIOS reported IRQ %d, using IRQ %d\n", | |
409 | acpi_device_name(link->device), | |
410 | acpi_device_bid(link->device), link->irq.active, irq); | |
1da177e4 LT |
411 | link->irq.active = irq; |
412 | } | |
413 | ||
414 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active)); | |
4be44fcd LB |
415 | |
416 | end: | |
1da177e4 LT |
417 | kfree(resource); |
418 | return_VALUE(result); | |
419 | } | |
420 | ||
1da177e4 LT |
421 | /* -------------------------------------------------------------------------- |
422 | PCI Link IRQ Management | |
423 | -------------------------------------------------------------------------- */ | |
424 | ||
425 | /* | |
426 | * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt | |
427 | * Link Devices to move the PIRQs around to minimize sharing. | |
428 | * | |
429 | * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs | |
430 | * that the BIOS has already set to active. This is necessary because | |
431 | * ACPI has no automatic means of knowing what ISA IRQs are used. Note that | |
432 | * if the BIOS doesn't set a Link Device active, ACPI needs to program it | |
433 | * even if acpi_irq_nobalance is set. | |
434 | * | |
435 | * A tables of penalties avoids directing PCI interrupts to well known | |
436 | * ISA IRQs. Boot params are available to over-ride the default table: | |
437 | * | |
438 | * List interrupts that are free for PCI use. | |
439 | * acpi_irq_pci=n[,m] | |
440 | * | |
441 | * List interrupts that should not be used for PCI: | |
442 | * acpi_irq_isa=n[,m] | |
443 | * | |
444 | * Note that PCI IRQ routers have a list of possible IRQs, | |
445 | * which may not include the IRQs this table says are available. | |
446 | * | |
447 | * Since this heuristic can't tell the difference between a link | |
448 | * that no device will attach to, vs. a link which may be shared | |
449 | * by multiple active devices -- it is not optimal. | |
450 | * | |
451 | * If interrupt performance is that important, get an IO-APIC system | |
452 | * with a pin dedicated to each device. Or for that matter, an MSI | |
453 | * enabled system. | |
454 | */ | |
455 | ||
456 | #define ACPI_MAX_IRQS 256 | |
457 | #define ACPI_MAX_ISA_IRQ 16 | |
458 | ||
459 | #define PIRQ_PENALTY_PCI_AVAILABLE (0) | |
460 | #define PIRQ_PENALTY_PCI_POSSIBLE (16*16) | |
461 | #define PIRQ_PENALTY_PCI_USING (16*16*16) | |
462 | #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16) | |
463 | #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16) | |
464 | #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16) | |
465 | ||
466 | static int acpi_irq_penalty[ACPI_MAX_IRQS] = { | |
467 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */ | |
468 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */ | |
469 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */ | |
4be44fcd LB |
470 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */ |
471 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */ | |
1da177e4 LT |
472 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */ |
473 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */ | |
474 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */ | |
475 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */ | |
476 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */ | |
477 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */ | |
478 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */ | |
479 | PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */ | |
480 | PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */ | |
481 | PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */ | |
482 | PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */ | |
4be44fcd | 483 | /* >IRQ15 */ |
1da177e4 LT |
484 | }; |
485 | ||
4be44fcd | 486 | int __init acpi_irq_penalty_init(void) |
1da177e4 | 487 | { |
4be44fcd LB |
488 | struct list_head *node = NULL; |
489 | struct acpi_pci_link *link = NULL; | |
490 | int i = 0; | |
1da177e4 LT |
491 | |
492 | ACPI_FUNCTION_TRACE("acpi_irq_penalty_init"); | |
493 | ||
494 | /* | |
495 | * Update penalties to facilitate IRQ balancing. | |
496 | */ | |
497 | list_for_each(node, &acpi_link.entries) { | |
498 | ||
499 | link = list_entry(node, struct acpi_pci_link, node); | |
500 | if (!link) { | |
4be44fcd LB |
501 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
502 | "Invalid link context\n")); | |
1da177e4 LT |
503 | continue; |
504 | } | |
505 | ||
506 | /* | |
507 | * reflect the possible and active irqs in the penalty table -- | |
508 | * useful for breaking ties. | |
509 | */ | |
510 | if (link->irq.possible_count) { | |
4be44fcd LB |
511 | int penalty = |
512 | PIRQ_PENALTY_PCI_POSSIBLE / | |
513 | link->irq.possible_count; | |
1da177e4 LT |
514 | |
515 | for (i = 0; i < link->irq.possible_count; i++) { | |
516 | if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ) | |
4be44fcd LB |
517 | acpi_irq_penalty[link->irq. |
518 | possible[i]] += | |
519 | penalty; | |
1da177e4 LT |
520 | } |
521 | ||
522 | } else if (link->irq.active) { | |
4be44fcd LB |
523 | acpi_irq_penalty[link->irq.active] += |
524 | PIRQ_PENALTY_PCI_POSSIBLE; | |
1da177e4 LT |
525 | } |
526 | } | |
527 | /* Add a penalty for the SCI */ | |
528 | acpi_irq_penalty[acpi_fadt.sci_int] += PIRQ_PENALTY_PCI_USING; | |
529 | ||
530 | return_VALUE(0); | |
531 | } | |
532 | ||
533 | static int acpi_irq_balance; /* 0: static, 1: balance */ | |
534 | ||
4be44fcd | 535 | static int acpi_pci_link_allocate(struct acpi_pci_link *link) |
1da177e4 | 536 | { |
4be44fcd LB |
537 | int irq; |
538 | int i; | |
1da177e4 LT |
539 | |
540 | ACPI_FUNCTION_TRACE("acpi_pci_link_allocate"); | |
541 | ||
87bec66b DSL |
542 | if (link->irq.initialized) { |
543 | if (link->refcnt == 0) | |
544 | /* This means the link is disabled but initialized */ | |
545 | acpi_pci_link_set(link, link->irq.active); | |
1da177e4 | 546 | return_VALUE(0); |
87bec66b | 547 | } |
1da177e4 LT |
548 | |
549 | /* | |
550 | * search for active IRQ in list of possible IRQs. | |
551 | */ | |
552 | for (i = 0; i < link->irq.possible_count; ++i) { | |
553 | if (link->irq.active == link->irq.possible[i]) | |
554 | break; | |
555 | } | |
556 | /* | |
557 | * forget active IRQ that is not in possible list | |
558 | */ | |
559 | if (i == link->irq.possible_count) { | |
560 | if (acpi_strict) | |
561 | printk(KERN_WARNING PREFIX "_CRS %d not found" | |
4be44fcd | 562 | " in _PRS\n", link->irq.active); |
1da177e4 LT |
563 | link->irq.active = 0; |
564 | } | |
565 | ||
566 | /* | |
567 | * if active found, use it; else pick entry from end of possible list. | |
568 | */ | |
569 | if (link->irq.active) { | |
570 | irq = link->irq.active; | |
571 | } else { | |
572 | irq = link->irq.possible[link->irq.possible_count - 1]; | |
573 | } | |
574 | ||
575 | if (acpi_irq_balance || !link->irq.active) { | |
576 | /* | |
577 | * Select the best IRQ. This is done in reverse to promote | |
578 | * the use of IRQs 9, 10, 11, and >15. | |
579 | */ | |
580 | for (i = (link->irq.possible_count - 1); i >= 0; i--) { | |
4be44fcd LB |
581 | if (acpi_irq_penalty[irq] > |
582 | acpi_irq_penalty[link->irq.possible[i]]) | |
1da177e4 LT |
583 | irq = link->irq.possible[i]; |
584 | } | |
585 | } | |
586 | ||
587 | /* Attempt to enable the link device at this IRQ. */ | |
588 | if (acpi_pci_link_set(link, irq)) { | |
4be44fcd LB |
589 | printk(PREFIX |
590 | "Unable to set IRQ for %s [%s] (likely buggy ACPI BIOS).\n" | |
591 | "Try pci=noacpi or acpi=off\n", | |
592 | acpi_device_name(link->device), | |
593 | acpi_device_bid(link->device)); | |
1da177e4 LT |
594 | return_VALUE(-ENODEV); |
595 | } else { | |
596 | acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING; | |
4be44fcd LB |
597 | printk(PREFIX "%s [%s] enabled at IRQ %d\n", |
598 | acpi_device_name(link->device), | |
599 | acpi_device_bid(link->device), link->irq.active); | |
1da177e4 LT |
600 | } |
601 | ||
602 | link->irq.initialized = 1; | |
603 | ||
604 | return_VALUE(0); | |
605 | } | |
606 | ||
607 | /* | |
87bec66b | 608 | * acpi_pci_link_allocate_irq |
1da177e4 LT |
609 | * success: return IRQ >= 0 |
610 | * failure: return -1 | |
611 | */ | |
612 | ||
613 | int | |
4be44fcd LB |
614 | acpi_pci_link_allocate_irq(acpi_handle handle, |
615 | int index, | |
616 | int *edge_level, int *active_high_low, char **name) | |
1da177e4 | 617 | { |
4be44fcd LB |
618 | int result = 0; |
619 | struct acpi_device *device = NULL; | |
620 | struct acpi_pci_link *link = NULL; | |
1da177e4 | 621 | |
87bec66b | 622 | ACPI_FUNCTION_TRACE("acpi_pci_link_allocate_irq"); |
1da177e4 LT |
623 | |
624 | result = acpi_bus_get_device(handle, &device); | |
625 | if (result) { | |
626 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n")); | |
627 | return_VALUE(-1); | |
628 | } | |
629 | ||
4be44fcd | 630 | link = (struct acpi_pci_link *)acpi_driver_data(device); |
1da177e4 LT |
631 | if (!link) { |
632 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n")); | |
633 | return_VALUE(-1); | |
634 | } | |
635 | ||
636 | /* TBD: Support multiple index (IRQ) entries per Link Device */ | |
637 | if (index) { | |
638 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid index %d\n", index)); | |
639 | return_VALUE(-1); | |
640 | } | |
641 | ||
87bec66b DSL |
642 | down(&acpi_link_lock); |
643 | if (acpi_pci_link_allocate(link)) { | |
644 | up(&acpi_link_lock); | |
1da177e4 | 645 | return_VALUE(-1); |
87bec66b | 646 | } |
4be44fcd | 647 | |
1da177e4 | 648 | if (!link->irq.active) { |
87bec66b | 649 | up(&acpi_link_lock); |
1da177e4 LT |
650 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link active IRQ is 0!\n")); |
651 | return_VALUE(-1); | |
652 | } | |
4be44fcd | 653 | link->refcnt++; |
87bec66b | 654 | up(&acpi_link_lock); |
1da177e4 | 655 | |
4be44fcd LB |
656 | if (edge_level) |
657 | *edge_level = link->irq.edge_level; | |
658 | if (active_high_low) | |
659 | *active_high_low = link->irq.active_high_low; | |
660 | if (name) | |
661 | *name = acpi_device_bid(link->device); | |
87bec66b | 662 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
663 | "Link %s is referenced\n", |
664 | acpi_device_bid(link->device))); | |
1da177e4 LT |
665 | return_VALUE(link->irq.active); |
666 | } | |
667 | ||
87bec66b DSL |
668 | /* |
669 | * We don't change link's irq information here. After it is reenabled, we | |
670 | * continue use the info | |
671 | */ | |
4be44fcd | 672 | int acpi_pci_link_free_irq(acpi_handle handle) |
87bec66b | 673 | { |
4be44fcd LB |
674 | struct acpi_device *device = NULL; |
675 | struct acpi_pci_link *link = NULL; | |
676 | acpi_status result; | |
87bec66b DSL |
677 | |
678 | ACPI_FUNCTION_TRACE("acpi_pci_link_free_irq"); | |
679 | ||
680 | result = acpi_bus_get_device(handle, &device); | |
681 | if (result) { | |
682 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n")); | |
683 | return_VALUE(-1); | |
684 | } | |
1da177e4 | 685 | |
4be44fcd | 686 | link = (struct acpi_pci_link *)acpi_driver_data(device); |
87bec66b DSL |
687 | if (!link) { |
688 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n")); | |
689 | return_VALUE(-1); | |
690 | } | |
691 | ||
692 | down(&acpi_link_lock); | |
693 | if (!link->irq.initialized) { | |
694 | up(&acpi_link_lock); | |
695 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link isn't initialized\n")); | |
696 | return_VALUE(-1); | |
697 | } | |
ecc21ebe DSL |
698 | #ifdef FUTURE_USE |
699 | /* | |
700 | * The Link reference count allows us to _DISable an unused link | |
701 | * and suspend time, and set it again on resume. | |
702 | * However, 2.6.12 still has irq_router.resume | |
703 | * which blindly restores the link state. | |
704 | * So we disable the reference count method | |
705 | * to prevent duplicate acpi_pci_link_set() | |
706 | * which would harm some systems | |
707 | */ | |
4be44fcd | 708 | link->refcnt--; |
ecc21ebe | 709 | #endif |
87bec66b | 710 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
711 | "Link %s is dereferenced\n", |
712 | acpi_device_bid(link->device))); | |
87bec66b DSL |
713 | |
714 | if (link->refcnt == 0) { | |
715 | acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL); | |
716 | } | |
717 | up(&acpi_link_lock); | |
718 | return_VALUE(link->irq.active); | |
719 | } | |
4be44fcd | 720 | |
1da177e4 LT |
721 | /* -------------------------------------------------------------------------- |
722 | Driver Interface | |
723 | -------------------------------------------------------------------------- */ | |
724 | ||
4be44fcd | 725 | static int acpi_pci_link_add(struct acpi_device *device) |
1da177e4 | 726 | { |
4be44fcd LB |
727 | int result = 0; |
728 | struct acpi_pci_link *link = NULL; | |
729 | int i = 0; | |
730 | int found = 0; | |
1da177e4 LT |
731 | |
732 | ACPI_FUNCTION_TRACE("acpi_pci_link_add"); | |
733 | ||
734 | if (!device) | |
735 | return_VALUE(-EINVAL); | |
736 | ||
737 | link = kmalloc(sizeof(struct acpi_pci_link), GFP_KERNEL); | |
738 | if (!link) | |
739 | return_VALUE(-ENOMEM); | |
740 | memset(link, 0, sizeof(struct acpi_pci_link)); | |
741 | ||
742 | link->device = device; | |
743 | link->handle = device->handle; | |
744 | strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME); | |
745 | strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS); | |
746 | acpi_driver_data(device) = link; | |
747 | ||
87bec66b | 748 | down(&acpi_link_lock); |
1da177e4 LT |
749 | result = acpi_pci_link_get_possible(link); |
750 | if (result) | |
751 | goto end; | |
752 | ||
753 | /* query and set link->irq.active */ | |
754 | acpi_pci_link_get_current(link); | |
755 | ||
756 | printk(PREFIX "%s [%s] (IRQs", acpi_device_name(device), | |
4be44fcd | 757 | acpi_device_bid(device)); |
1da177e4 LT |
758 | for (i = 0; i < link->irq.possible_count; i++) { |
759 | if (link->irq.active == link->irq.possible[i]) { | |
760 | printk(" *%d", link->irq.possible[i]); | |
761 | found = 1; | |
4be44fcd | 762 | } else |
1da177e4 LT |
763 | printk(" %d", link->irq.possible[i]); |
764 | } | |
765 | ||
766 | printk(")"); | |
767 | ||
768 | if (!found) | |
769 | printk(" *%d", link->irq.active); | |
770 | ||
4be44fcd | 771 | if (!link->device->status.enabled) |
1da177e4 LT |
772 | printk(", disabled."); |
773 | ||
774 | printk("\n"); | |
775 | ||
776 | /* TBD: Acquire/release lock */ | |
777 | list_add_tail(&link->node, &acpi_link.entries); | |
778 | acpi_link.count++; | |
779 | ||
4be44fcd | 780 | end: |
1da177e4 LT |
781 | /* disable all links -- to be activated on use */ |
782 | acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL); | |
87bec66b | 783 | up(&acpi_link_lock); |
1da177e4 LT |
784 | |
785 | if (result) | |
786 | kfree(link); | |
787 | ||
788 | return_VALUE(result); | |
789 | } | |
790 | ||
4be44fcd | 791 | static int acpi_pci_link_resume(struct acpi_pci_link *link) |
697a2d63 LT |
792 | { |
793 | ACPI_FUNCTION_TRACE("acpi_pci_link_resume"); | |
794 | ||
795 | if (link->refcnt && link->irq.active && link->irq.initialized) | |
796 | return_VALUE(acpi_pci_link_set(link, link->irq.active)); | |
797 | else | |
798 | return_VALUE(0); | |
799 | } | |
800 | ||
11e981f1 DSL |
801 | /* |
802 | * FIXME: this is a workaround to avoid nasty warning. It will be removed | |
803 | * after every device calls pci_disable_device in .resume. | |
804 | */ | |
805 | int acpi_in_resume; | |
4be44fcd | 806 | static int irqrouter_resume(struct sys_device *dev) |
1da177e4 | 807 | { |
4be44fcd LB |
808 | struct list_head *node = NULL; |
809 | struct acpi_pci_link *link = NULL; | |
1da177e4 | 810 | |
697a2d63 | 811 | ACPI_FUNCTION_TRACE("irqrouter_resume"); |
1da177e4 | 812 | |
11e981f1 | 813 | acpi_in_resume = 1; |
1da177e4 | 814 | list_for_each(node, &acpi_link.entries) { |
1da177e4 LT |
815 | link = list_entry(node, struct acpi_pci_link, node); |
816 | if (!link) { | |
87bec66b | 817 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
4be44fcd | 818 | "Invalid link context\n")); |
1da177e4 LT |
819 | continue; |
820 | } | |
697a2d63 | 821 | acpi_pci_link_resume(link); |
1da177e4 | 822 | } |
11e981f1 | 823 | acpi_in_resume = 0; |
697a2d63 | 824 | return_VALUE(0); |
1da177e4 LT |
825 | } |
826 | ||
4be44fcd | 827 | static int acpi_pci_link_remove(struct acpi_device *device, int type) |
1da177e4 LT |
828 | { |
829 | struct acpi_pci_link *link = NULL; | |
830 | ||
831 | ACPI_FUNCTION_TRACE("acpi_pci_link_remove"); | |
832 | ||
833 | if (!device || !acpi_driver_data(device)) | |
834 | return_VALUE(-EINVAL); | |
835 | ||
4be44fcd | 836 | link = (struct acpi_pci_link *)acpi_driver_data(device); |
1da177e4 | 837 | |
87bec66b | 838 | down(&acpi_link_lock); |
1da177e4 | 839 | list_del(&link->node); |
87bec66b | 840 | up(&acpi_link_lock); |
1da177e4 LT |
841 | |
842 | kfree(link); | |
843 | ||
844 | return_VALUE(0); | |
845 | } | |
846 | ||
847 | /* | |
848 | * modify acpi_irq_penalty[] from cmdline | |
849 | */ | |
850 | static int __init acpi_irq_penalty_update(char *str, int used) | |
851 | { | |
852 | int i; | |
853 | ||
854 | for (i = 0; i < 16; i++) { | |
855 | int retval; | |
856 | int irq; | |
857 | ||
4be44fcd | 858 | retval = get_option(&str, &irq); |
1da177e4 LT |
859 | |
860 | if (!retval) | |
861 | break; /* no number found */ | |
862 | ||
863 | if (irq < 0) | |
864 | continue; | |
4be44fcd | 865 | |
1da177e4 LT |
866 | if (irq >= ACPI_MAX_IRQS) |
867 | continue; | |
868 | ||
869 | if (used) | |
870 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
871 | else | |
872 | acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE; | |
873 | ||
874 | if (retval != 2) /* no next number */ | |
875 | break; | |
876 | } | |
877 | return 1; | |
878 | } | |
879 | ||
880 | /* | |
881 | * We'd like PNP to call this routine for the | |
882 | * single ISA_USED value for each legacy device. | |
883 | * But instead it calls us with each POSSIBLE setting. | |
884 | * There is no ISA_POSSIBLE weight, so we simply use | |
885 | * the (small) PCI_USING penalty. | |
886 | */ | |
c9c3e457 | 887 | void acpi_penalize_isa_irq(int irq, int active) |
1da177e4 | 888 | { |
c9c3e457 DSL |
889 | if (active) |
890 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
891 | else | |
892 | acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING; | |
1da177e4 LT |
893 | } |
894 | ||
895 | /* | |
896 | * Over-ride default table to reserve additional IRQs for use by ISA | |
897 | * e.g. acpi_irq_isa=5 | |
898 | * Useful for telling ACPI how not to interfere with your ISA sound card. | |
899 | */ | |
900 | static int __init acpi_irq_isa(char *str) | |
901 | { | |
902 | return acpi_irq_penalty_update(str, 1); | |
903 | } | |
4be44fcd | 904 | |
1da177e4 LT |
905 | __setup("acpi_irq_isa=", acpi_irq_isa); |
906 | ||
907 | /* | |
908 | * Over-ride default table to free additional IRQs for use by PCI | |
909 | * e.g. acpi_irq_pci=7,15 | |
910 | * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing. | |
911 | */ | |
912 | static int __init acpi_irq_pci(char *str) | |
913 | { | |
914 | return acpi_irq_penalty_update(str, 0); | |
915 | } | |
4be44fcd | 916 | |
1da177e4 LT |
917 | __setup("acpi_irq_pci=", acpi_irq_pci); |
918 | ||
919 | static int __init acpi_irq_nobalance_set(char *str) | |
920 | { | |
921 | acpi_irq_balance = 0; | |
922 | return 1; | |
923 | } | |
4be44fcd | 924 | |
1da177e4 LT |
925 | __setup("acpi_irq_nobalance", acpi_irq_nobalance_set); |
926 | ||
927 | int __init acpi_irq_balance_set(char *str) | |
928 | { | |
929 | acpi_irq_balance = 1; | |
930 | return 1; | |
931 | } | |
1da177e4 | 932 | |
4be44fcd | 933 | __setup("acpi_irq_balance", acpi_irq_balance_set); |
1da177e4 | 934 | |
87bec66b | 935 | /* FIXME: we will remove this interface after all drivers call pci_disable_device */ |
1da177e4 | 936 | static struct sysdev_class irqrouter_sysdev_class = { |
4be44fcd LB |
937 | set_kset_name("irqrouter"), |
938 | .resume = irqrouter_resume, | |
1da177e4 LT |
939 | }; |
940 | ||
1da177e4 | 941 | static struct sys_device device_irqrouter = { |
4be44fcd LB |
942 | .id = 0, |
943 | .cls = &irqrouter_sysdev_class, | |
1da177e4 LT |
944 | }; |
945 | ||
1da177e4 LT |
946 | static int __init irqrouter_init_sysfs(void) |
947 | { | |
948 | int error; | |
949 | ||
950 | ACPI_FUNCTION_TRACE("irqrouter_init_sysfs"); | |
951 | ||
952 | if (acpi_disabled || acpi_noirq) | |
953 | return_VALUE(0); | |
954 | ||
955 | error = sysdev_class_register(&irqrouter_sysdev_class); | |
956 | if (!error) | |
957 | error = sysdev_register(&device_irqrouter); | |
958 | ||
959 | return_VALUE(error); | |
4be44fcd | 960 | } |
1da177e4 LT |
961 | |
962 | device_initcall(irqrouter_init_sysfs); | |
963 | ||
4be44fcd | 964 | static int __init acpi_pci_link_init(void) |
1da177e4 LT |
965 | { |
966 | ACPI_FUNCTION_TRACE("acpi_pci_link_init"); | |
967 | ||
968 | if (acpi_noirq) | |
969 | return_VALUE(0); | |
970 | ||
971 | acpi_link.count = 0; | |
972 | INIT_LIST_HEAD(&acpi_link.entries); | |
973 | ||
974 | if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0) | |
975 | return_VALUE(-ENODEV); | |
976 | ||
977 | return_VALUE(0); | |
978 | } | |
979 | ||
980 | subsys_initcall(acpi_pci_link_init); |