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