kernel/irq/chip.c

   1 /*
   2  * linux/kernel/irq/chip.c
   3  *
   4  * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
   5  * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
   6  *
   7  * This file contains the core interrupt handling code, for irq-chip
   8  * based architectures.
   9  *
  10  * Detailed information is available in Documentation/DocBook/genericirq
  11  */
  12
  13 #include <linux/irq.h>
  14 #include <linux/msi.h>
  15 #include <linux/module.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/kernel_stat.h>
  18
  19 #include <trace/events/irq.h>
  20
  21 #include "internals.h"
  22
  23 /**
  24  *      irq_set_chip - set the irq chip for an irq
  25  *      @irq:   irq number
  26  *      @chip:  pointer to irq chip description structure
  27  */
  28 int irq_set_chip(unsigned int irq, struct irq_chip *chip)
  29 {
  30         unsigned long flags;
  31         struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
  32
  33         if (!desc)
  34                 return -EINVAL;
  35
  36         if (!chip)
  37                 chip = &no_irq_chip;
  38
  39         desc->irq_data.chip = chip;
  40         irq_put_desc_unlock(desc, flags);
  41         /*
  42          * For !CONFIG_SPARSE_IRQ make the irq show up in
  43          * allocated_irqs. For the CONFIG_SPARSE_IRQ case, it is
  44          * already marked, and this call is harmless.
  45          */
  46         irq_reserve_irq(irq);
  47         return 0;
  48 }
  49 EXPORT_SYMBOL(irq_set_chip);
  50
  51 /**
  52  *      irq_set_type - set the irq trigger type for an irq
  53  *      @irq:   irq number
  54  *      @type:  IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
  55  */
  56 int irq_set_irq_type(unsigned int irq, unsigned int type)
  57 {
  58         unsigned long flags;
  59         struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
  60         int ret = 0;
  61
  62         if (!desc)
  63                 return -EINVAL;
  64
  65         type &= IRQ_TYPE_SENSE_MASK;
  66         ret = __irq_set_trigger(desc, irq, type);
  67         irq_put_desc_busunlock(desc, flags);
  68         return ret;
  69 }
  70 EXPORT_SYMBOL(irq_set_irq_type);
  71
  72 /**
  73  *      irq_set_handler_data - set irq handler data for an irq
  74  *      @irq:   Interrupt number
  75  *      @data:  Pointer to interrupt specific data
  76  *
  77  *      Set the hardware irq controller data for an irq
  78  */
  79 int irq_set_handler_data(unsigned int irq, void *data)
  80 {
  81         unsigned long flags;
  82         struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
  83
  84         if (!desc)
  85                 return -EINVAL;
  86         desc->irq_data.handler_data = data;
  87         irq_put_desc_unlock(desc, flags);
  88         return 0;
  89 }
  90 EXPORT_SYMBOL(irq_set_handler_data);
  91
  92 /**
  93  *      irq_set_msi_desc_off - set MSI descriptor data for an irq at offset
  94  *      @irq_base:      Interrupt number base
  95  *      @irq_offset:    Interrupt number offset
  96  *      @entry:         Pointer to MSI descriptor data
  97  *
  98  *      Set the MSI descriptor entry for an irq at offset
  99  */
 100 int irq_set_msi_desc_off(unsigned int irq_base, unsigned int irq_offset,
 101                          struct msi_desc *entry)
 102 {
 103         unsigned long flags;
 104         struct irq_desc *desc = irq_get_desc_lock(irq_base + irq_offset, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
 105
 106         if (!desc)
 107                 return -EINVAL;
 108         desc->irq_data.msi_desc = entry;
 109         if (entry && !irq_offset)
 110                 entry->irq = irq_base;
 111         irq_put_desc_unlock(desc, flags);
 112         return 0;
 113 }
 114
 115 /**
 116  *      irq_set_msi_desc - set MSI descriptor data for an irq
 117  *      @irq:   Interrupt number
 118  *      @entry: Pointer to MSI descriptor data
 119  *
 120  *      Set the MSI descriptor entry for an irq
 121  */
 122 int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
 123 {
 124         return irq_set_msi_desc_off(irq, 0, entry);
 125 }
 126
 127 /**
 128  *      irq_set_chip_data - set irq chip data for an irq
 129  *      @irq:   Interrupt number
 130  *      @data:  Pointer to chip specific data
 131  *
 132  *      Set the hardware irq chip data for an irq
 133  */
 134 int irq_set_chip_data(unsigned int irq, void *data)
 135 {
 136         unsigned long flags;
 137         struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
 138
 139         if (!desc)
 140                 return -EINVAL;
 141         desc->irq_data.chip_data = data;
 142         irq_put_desc_unlock(desc, flags);
 143         return 0;
 144 }
 145 EXPORT_SYMBOL(irq_set_chip_data);
 146
 147 struct irq_data *irq_get_irq_data(unsigned int irq)
 148 {
 149         struct irq_desc *desc = irq_to_desc(irq);
 150
 151         return desc ? &desc->irq_data : NULL;
 152 }
 153 EXPORT_SYMBOL_GPL(irq_get_irq_data);
 154
 155 static void irq_state_clr_disabled(struct irq_desc *desc)
 156 {
 157         irqd_clear(&desc->irq_data, IRQD_IRQ_DISABLED);
 158 }
 159
 160 static void irq_state_set_disabled(struct irq_desc *desc)
 161 {
 162         irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
 163 }
 164
 165 static void irq_state_clr_masked(struct irq_desc *desc)
 166 {
 167         irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED);
 168 }
 169
 170 static void irq_state_set_masked(struct irq_desc *desc)
 171 {
 172         irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
 173 }
 174
 175 int irq_startup(struct irq_desc *desc, bool resend)
 176 {
 177         int ret = 0;
 178
 179         irq_state_clr_disabled(desc);
 180         desc->depth = 0;
 181
 182         if (desc->irq_data.chip->irq_startup) {
 183                 ret = desc->irq_data.chip->irq_startup(&desc->irq_data);
 184                 irq_state_clr_masked(desc);
 185         } else {
 186                 irq_enable(desc);
 187         }
 188         if (resend)
 189                 check_irq_resend(desc, desc->irq_data.irq);
 190         return ret;
 191 }
 192
 193 void irq_shutdown(struct irq_desc *desc)
 194 {
 195         irq_state_set_disabled(desc);
 196         desc->depth = 1;
 197         if (desc->irq_data.chip->irq_shutdown)
 198                 desc->irq_data.chip->irq_shutdown(&desc->irq_data);
 199         else if (desc->irq_data.chip->irq_disable)
 200                 desc->irq_data.chip->irq_disable(&desc->irq_data);
 201         else
 202                 desc->irq_data.chip->irq_mask(&desc->irq_data);
 203         irq_state_set_masked(desc);
 204 }
 205
 206 void irq_enable(struct irq_desc *desc)
 207 {
 208         irq_state_clr_disabled(desc);
 209         if (desc->irq_data.chip->irq_enable)
 210                 desc->irq_data.chip->irq_enable(&desc->irq_data);
 211         else
 212                 desc->irq_data.chip->irq_unmask(&desc->irq_data);
 213         irq_state_clr_masked(desc);
 214 }
 215
 216 /**
 217  * irq_disable - Mark interrupt disabled
 218  * @desc:       irq descriptor which should be disabled
 219  *
 220  * If the chip does not implement the irq_disable callback, we
 221  * use a lazy disable approach. That means we mark the interrupt
 222  * disabled, but leave the hardware unmasked. That's an
 223  * optimization because we avoid the hardware access for the
 224  * common case where no interrupt happens after we marked it
 225  * disabled. If an interrupt happens, then the interrupt flow
 226  * handler masks the line at the hardware level and marks it
 227  * pending.
 228  */
 229 void irq_disable(struct irq_desc *desc)
 230 {
 231         irq_state_set_disabled(desc);
 232         if (desc->irq_data.chip->irq_disable) {
 233                 desc->irq_data.chip->irq_disable(&desc->irq_data);
 234                 irq_state_set_masked(desc);
 235         }
 236 }
 237
 238 void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu)
 239 {
 240         if (desc->irq_data.chip->irq_enable)
 241                 desc->irq_data.chip->irq_enable(&desc->irq_data);
 242         else
 243                 desc->irq_data.chip->irq_unmask(&desc->irq_data);
 244         cpumask_set_cpu(cpu, desc->percpu_enabled);
 245 }
 246
 247 void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu)
 248 {
 249         if (desc->irq_data.chip->irq_disable)
 250                 desc->irq_data.chip->irq_disable(&desc->irq_data);
 251         else
 252                 desc->irq_data.chip->irq_mask(&desc->irq_data);
 253         cpumask_clear_cpu(cpu, desc->percpu_enabled);
 254 }
 255
 256 static inline void mask_ack_irq(struct irq_desc *desc)
 257 {
 258         if (desc->irq_data.chip->irq_mask_ack)
 259                 desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
 260         else {
 261                 desc->irq_data.chip->irq_mask(&desc->irq_data);
 262                 if (desc->irq_data.chip->irq_ack)
 263                         desc->irq_data.chip->irq_ack(&desc->irq_data);
 264         }
 265         irq_state_set_masked(desc);
 266 }
 267
 268 void mask_irq(struct irq_desc *desc)
 269 {
 270         if (desc->irq_data.chip->irq_mask) {
 271                 desc->irq_data.chip->irq_mask(&desc->irq_data);
 272                 irq_state_set_masked(desc);
 273         }
 274 }
 275
 276 void unmask_irq(struct irq_desc *desc)
 277 {
 278         if (desc->irq_data.chip->irq_unmask) {
 279                 desc->irq_data.chip->irq_unmask(&desc->irq_data);
 280                 irq_state_clr_masked(desc);
 281         }
 282 }
 283
 284 void unmask_threaded_irq(struct irq_desc *desc)
 285 {
 286         struct irq_chip *chip = desc->irq_data.chip;
 287
 288         if (chip->flags & IRQCHIP_EOI_THREADED)
 289                 chip->irq_eoi(&desc->irq_data);
 290
 291         if (chip->irq_unmask) {
 292                 chip->irq_unmask(&desc->irq_data);
 293                 irq_state_clr_masked(desc);
 294         }
 295 }
 296
 297 /*
 298  *      handle_nested_irq - Handle a nested irq from a irq thread
 299  *      @irq:   the interrupt number
 300  *
 301  *      Handle interrupts which are nested into a threaded interrupt
 302  *      handler. The handler function is called inside the calling
 303  *      threads context.
 304  */
 305 void handle_nested_irq(unsigned int irq)
 306 {
 307         struct irq_desc *desc = irq_to_desc(irq);
 308         struct irqaction *action;
 309         irqreturn_t action_ret;
 310
 311         might_sleep();
 312
 313         raw_spin_lock_irq(&desc->lock);
 314
 315         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 316         kstat_incr_irqs_this_cpu(irq, desc);
 317
 318         action = desc->action;
 319         if (unlikely(!action || irqd_irq_disabled(&desc->irq_data))) {
 320                 desc->istate |= IRQS_PENDING;
 321                 goto out_unlock;
 322         }
 323
 324         irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
 325         raw_spin_unlock_irq(&desc->lock);
 326
 327         action_ret = action->thread_fn(action->irq, action->dev_id);
 328         if (!noirqdebug)
 329                 note_interrupt(irq, desc, action_ret);
 330
 331         raw_spin_lock_irq(&desc->lock);
 332         irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
 333
 334 out_unlock:
 335         raw_spin_unlock_irq(&desc->lock);
 336 }
 337 EXPORT_SYMBOL_GPL(handle_nested_irq);
 338
 339 static bool irq_check_poll(struct irq_desc *desc)
 340 {
 341         if (!(desc->istate & IRQS_POLL_INPROGRESS))
 342                 return false;
 343         return irq_wait_for_poll(desc);
 344 }
 345
 346 /**
 347  *      handle_simple_irq - Simple and software-decoded IRQs.
 348  *      @irq:   the interrupt number
 349  *      @desc:  the interrupt description structure for this irq
 350  *
 351  *      Simple interrupts are either sent from a demultiplexing interrupt
 352  *      handler or come from hardware, where no interrupt hardware control
 353  *      is necessary.
 354  *
 355  *      Note: The caller is expected to handle the ack, clear, mask and
 356  *      unmask issues if necessary.
 357  */
 358 void
 359 handle_simple_irq(unsigned int irq, struct irq_desc *desc)
 360 {
 361         raw_spin_lock(&desc->lock);
 362
 363         if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
 364                 if (!irq_check_poll(desc))
 365                         goto out_unlock;
 366
 367         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 368         kstat_incr_irqs_this_cpu(irq, desc);
 369
 370         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
 371                 desc->istate |= IRQS_PENDING;
 372                 goto out_unlock;
 373         }
 374
 375         handle_irq_event(desc);
 376
 377 out_unlock:
 378         raw_spin_unlock(&desc->lock);
 379 }
 380 EXPORT_SYMBOL_GPL(handle_simple_irq);
 381
 382 /*
 383  * Called unconditionally from handle_level_irq() and only for oneshot
 384  * interrupts from handle_fasteoi_irq()
 385  */
 386 static void cond_unmask_irq(struct irq_desc *desc)
 387 {
 388         /*
 389          * We need to unmask in the following cases:
 390          * - Standard level irq (IRQF_ONESHOT is not set)
 391          * - Oneshot irq which did not wake the thread (caused by a
 392          *   spurious interrupt or a primary handler handling it
 393          *   completely).
 394          */
 395         if (!irqd_irq_disabled(&desc->irq_data) &&
 396             irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot)
 397                 unmask_irq(desc);
 398 }
 399
 400 /**
 401  *      handle_level_irq - Level type irq handler
 402  *      @irq:   the interrupt number
 403  *      @desc:  the interrupt description structure for this irq
 404  *
 405  *      Level type interrupts are active as long as the hardware line has
 406  *      the active level. This may require to mask the interrupt and unmask
 407  *      it after the associated handler has acknowledged the device, so the
 408  *      interrupt line is back to inactive.
 409  */
 410 void
 411 handle_level_irq(unsigned int irq, struct irq_desc *desc)
 412 {
 413         raw_spin_lock(&desc->lock);
 414         mask_ack_irq(desc);
 415
 416         if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
 417                 if (!irq_check_poll(desc))
 418                         goto out_unlock;
 419
 420         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 421         kstat_incr_irqs_this_cpu(irq, desc);
 422
 423         /*
 424          * If its disabled or no action available
 425          * keep it masked and get out of here
 426          */
 427         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
 428                 desc->istate |= IRQS_PENDING;
 429                 goto out_unlock;
 430         }
 431
 432         handle_irq_event(desc);
 433
 434         cond_unmask_irq(desc);
 435
 436 out_unlock:
 437         raw_spin_unlock(&desc->lock);
 438 }
 439 EXPORT_SYMBOL_GPL(handle_level_irq);
 440
 441 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 442 static inline void preflow_handler(struct irq_desc *desc)
 443 {
 444         if (desc->preflow_handler)
 445                 desc->preflow_handler(&desc->irq_data);
 446 }
 447 #else
 448 static inline void preflow_handler(struct irq_desc *desc) { }
 449 #endif
 450
 451 static void cond_unmask_eoi_irq(struct irq_desc *desc, struct irq_chip *chip)
 452 {
 453         if (!(desc->istate & IRQS_ONESHOT)) {
 454                 chip->irq_eoi(&desc->irq_data);
 455                 return;
 456         }
 457         /*
 458          * We need to unmask in the following cases:
 459          * - Oneshot irq which did not wake the thread (caused by a
 460          *   spurious interrupt or a primary handler handling it
 461          *   completely).
 462          */
 463         if (!irqd_irq_disabled(&desc->irq_data) &&
 464             irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot) {
 465                 chip->irq_eoi(&desc->irq_data);
 466                 unmask_irq(desc);
 467         } else if (!(chip->flags & IRQCHIP_EOI_THREADED)) {
 468                 chip->irq_eoi(&desc->irq_data);
 469         }
 470 }
 471
 472 /**
 473  *      handle_fasteoi_irq - irq handler for transparent controllers
 474  *      @irq:   the interrupt number
 475  *      @desc:  the interrupt description structure for this irq
 476  *
 477  *      Only a single callback will be issued to the chip: an ->eoi()
 478  *      call when the interrupt has been serviced. This enables support
 479  *      for modern forms of interrupt handlers, which handle the flow
 480  *      details in hardware, transparently.
 481  */
 482 void
 483 handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
 484 {
 485         struct irq_chip *chip = desc->irq_data.chip;
 486
 487         raw_spin_lock(&desc->lock);
 488
 489         if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
 490                 if (!irq_check_poll(desc))
 491                         goto out;
 492
 493         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 494         kstat_incr_irqs_this_cpu(irq, desc);
 495
 496         /*
 497          * If its disabled or no action available
 498          * then mask it and get out of here:
 499          */
 500         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
 501                 desc->istate |= IRQS_PENDING;
 502                 mask_irq(desc);
 503                 goto out;
 504         }
 505
 506         if (desc->istate & IRQS_ONESHOT)
 507                 mask_irq(desc);
 508
 509         preflow_handler(desc);
 510         handle_irq_event(desc);
 511
 512         cond_unmask_eoi_irq(desc, chip);
 513
 514         raw_spin_unlock(&desc->lock);
 515         return;
 516 out:
 517         if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
 518                 chip->irq_eoi(&desc->irq_data);
 519         raw_spin_unlock(&desc->lock);
 520 }
 521
 522 /**
 523  *      handle_edge_irq - edge type IRQ handler
 524  *      @irq:   the interrupt number
 525  *      @desc:  the interrupt description structure for this irq
 526  *
 527  *      Interrupt occures on the falling and/or rising edge of a hardware
 528  *      signal. The occurrence is latched into the irq controller hardware
 529  *      and must be acked in order to be reenabled. After the ack another
 530  *      interrupt can happen on the same source even before the first one
 531  *      is handled by the associated event handler. If this happens it
 532  *      might be necessary to disable (mask) the interrupt depending on the
 533  *      controller hardware. This requires to reenable the interrupt inside
 534  *      of the loop which handles the interrupts which have arrived while
 535  *      the handler was running. If all pending interrupts are handled, the
 536  *      loop is left.
 537  */
 538 void
 539 handle_edge_irq(unsigned int irq, struct irq_desc *desc)
 540 {
 541         raw_spin_lock(&desc->lock);
 542
 543         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 544         /*
 545          * If we're currently running this IRQ, or its disabled,
 546          * we shouldn't process the IRQ. Mark it pending, handle
 547          * the necessary masking and go out
 548          */
 549         if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
 550                      irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
 551                 if (!irq_check_poll(desc)) {
 552                         desc->istate |= IRQS_PENDING;
 553                         mask_ack_irq(desc);
 554                         goto out_unlock;
 555                 }
 556         }
 557         kstat_incr_irqs_this_cpu(irq, desc);
 558
 559         /* Start handling the irq */
 560         desc->irq_data.chip->irq_ack(&desc->irq_data);
 561
 562         do {
 563                 if (unlikely(!desc->action)) {
 564                         mask_irq(desc);
 565                         goto out_unlock;
 566                 }
 567
 568                 /*
 569                  * When another irq arrived while we were handling
 570                  * one, we could have masked the irq.
 571                  * Renable it, if it was not disabled in meantime.
 572                  */
 573                 if (unlikely(desc->istate & IRQS_PENDING)) {
 574                         if (!irqd_irq_disabled(&desc->irq_data) &&
 575                             irqd_irq_masked(&desc->irq_data))
 576                                 unmask_irq(desc);
 577                 }
 578
 579                 handle_irq_event(desc);
 580
 581         } while ((desc->istate & IRQS_PENDING) &&
 582                  !irqd_irq_disabled(&desc->irq_data));
 583
 584 out_unlock:
 585         raw_spin_unlock(&desc->lock);
 586 }
 587 EXPORT_SYMBOL(handle_edge_irq);
 588
 589 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
 590 /**
 591  *      handle_edge_eoi_irq - edge eoi type IRQ handler
 592  *      @irq:   the interrupt number
 593  *      @desc:  the interrupt description structure for this irq
 594  *
 595  * Similar as the above handle_edge_irq, but using eoi and w/o the
 596  * mask/unmask logic.
 597  */
 598 void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc)
 599 {
 600         struct irq_chip *chip = irq_desc_get_chip(desc);
 601
 602         raw_spin_lock(&desc->lock);
 603
 604         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 605         /*
 606          * If we're currently running this IRQ, or its disabled,
 607          * we shouldn't process the IRQ. Mark it pending, handle
 608          * the necessary masking and go out
 609          */
 610         if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
 611                      irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
 612                 if (!irq_check_poll(desc)) {
 613                         desc->istate |= IRQS_PENDING;
 614                         goto out_eoi;
 615                 }
 616         }
 617         kstat_incr_irqs_this_cpu(irq, desc);
 618
 619         do {
 620                 if (unlikely(!desc->action))
 621                         goto out_eoi;
 622
 623                 handle_irq_event(desc);
 624
 625         } while ((desc->istate & IRQS_PENDING) &&
 626                  !irqd_irq_disabled(&desc->irq_data));
 627
 628 out_eoi:
 629         chip->irq_eoi(&desc->irq_data);
 630         raw_spin_unlock(&desc->lock);
 631 }
 632 #endif
 633
 634 /**
 635  *      handle_percpu_irq - Per CPU local irq handler
 636  *      @irq:   the interrupt number
 637  *      @desc:  the interrupt description structure for this irq
 638  *
 639  *      Per CPU interrupts on SMP machines without locking requirements
 640  */
 641 void
 642 handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
 643 {
 644         struct irq_chip *chip = irq_desc_get_chip(desc);
 645
 646         kstat_incr_irqs_this_cpu(irq, desc);
 647
 648         if (chip->irq_ack)
 649                 chip->irq_ack(&desc->irq_data);
 650
 651         handle_irq_event_percpu(desc, desc->action);
 652
 653         if (chip->irq_eoi)
 654                 chip->irq_eoi(&desc->irq_data);
 655 }
 656
 657 /**
 658  * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
 659  * @irq:        the interrupt number
 660  * @desc:       the interrupt description structure for this irq
 661  *
 662  * Per CPU interrupts on SMP machines without locking requirements. Same as
 663  * handle_percpu_irq() above but with the following extras:
 664  *
 665  * action->percpu_dev_id is a pointer to percpu variables which
 666  * contain the real device id for the cpu on which this handler is
 667  * called
 668  */
 669 void handle_percpu_devid_irq(unsigned int irq, struct irq_desc *desc)
 670 {
 671         struct irq_chip *chip = irq_desc_get_chip(desc);
 672         struct irqaction *action = desc->action;
 673         void *dev_id = __this_cpu_ptr(action->percpu_dev_id);
 674         irqreturn_t res;
 675
 676         kstat_incr_irqs_this_cpu(irq, desc);
 677
 678         if (chip->irq_ack)
 679                 chip->irq_ack(&desc->irq_data);
 680
 681         trace_irq_handler_entry(irq, action);
 682         res = action->handler(irq, dev_id);
 683         trace_irq_handler_exit(irq, action, res);
 684
 685         if (chip->irq_eoi)
 686                 chip->irq_eoi(&desc->irq_data);
 687 }
 688
 689 void
 690 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 691                   const char *name)
 692 {
 693         unsigned long flags;
 694         struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
 695
 696         if (!desc)
 697                 return;
 698
 699         if (!handle) {
 700                 handle = handle_bad_irq;
 701         } else {
 702                 if (WARN_ON(desc->irq_data.chip == &no_irq_chip))
 703                         goto out;
 704         }
 705
 706         /* Uninstall? */
 707         if (handle == handle_bad_irq) {
 708                 if (desc->irq_data.chip != &no_irq_chip)
 709                         mask_ack_irq(desc);
 710                 irq_state_set_disabled(desc);
 711                 desc->depth = 1;
 712         }
 713         desc->handle_irq = handle;
 714         desc->name = name;
 715
 716         if (handle != handle_bad_irq && is_chained) {
 717                 irq_settings_set_noprobe(desc);
 718                 irq_settings_set_norequest(desc);
 719                 irq_settings_set_nothread(desc);
 720                 irq_startup(desc, true);
 721         }
 722 out:
 723         irq_put_desc_busunlock(desc, flags);
 724 }
 725 EXPORT_SYMBOL_GPL(__irq_set_handler);
 726
 727 void
 728 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
 729                               irq_flow_handler_t handle, const char *name)
 730 {
 731         irq_set_chip(irq, chip);
 732         __irq_set_handler(irq, handle, 0, name);
 733 }
 734 EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name);
 735
 736 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
 737 {
 738         unsigned long flags;
 739         struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
 740
 741         if (!desc)
 742                 return;
 743         irq_settings_clr_and_set(desc, clr, set);
 744
 745         irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
 746                    IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
 747         if (irq_settings_has_no_balance_set(desc))
 748                 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
 749         if (irq_settings_is_per_cpu(desc))
 750                 irqd_set(&desc->irq_data, IRQD_PER_CPU);
 751         if (irq_settings_can_move_pcntxt(desc))
 752                 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
 753         if (irq_settings_is_level(desc))
 754                 irqd_set(&desc->irq_data, IRQD_LEVEL);
 755
 756         irqd_set(&desc->irq_data, irq_settings_get_trigger_mask(desc));
 757
 758         irq_put_desc_unlock(desc, flags);
 759 }
 760 EXPORT_SYMBOL_GPL(irq_modify_status);
 761
 762 /**
 763  *      irq_cpu_online - Invoke all irq_cpu_online functions.
 764  *
 765  *      Iterate through all irqs and invoke the chip.irq_cpu_online()
 766  *      for each.
 767  */
 768 void irq_cpu_online(void)
 769 {
 770         struct irq_desc *desc;
 771         struct irq_chip *chip;
 772         unsigned long flags;
 773         unsigned int irq;
 774
 775         for_each_active_irq(irq) {
 776                 desc = irq_to_desc(irq);
 777                 if (!desc)
 778                         continue;
 779
 780                 raw_spin_lock_irqsave(&desc->lock, flags);
 781
 782                 chip = irq_data_get_irq_chip(&desc->irq_data);
 783                 if (chip && chip->irq_cpu_online &&
 784                     (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
 785                      !irqd_irq_disabled(&desc->irq_data)))
 786                         chip->irq_cpu_online(&desc->irq_data);
 787
 788                 raw_spin_unlock_irqrestore(&desc->lock, flags);
 789         }
 790 }
 791
 792 /**
 793  *      irq_cpu_offline - Invoke all irq_cpu_offline functions.
 794  *
 795  *      Iterate through all irqs and invoke the chip.irq_cpu_offline()
 796  *      for each.
 797  */
 798 void irq_cpu_offline(void)
 799 {
 800         struct irq_desc *desc;
 801         struct irq_chip *chip;
 802         unsigned long flags;
 803         unsigned int irq;
 804
 805         for_each_active_irq(irq) {
 806                 desc = irq_to_desc(irq);
 807                 if (!desc)
 808                         continue;
 809
 810                 raw_spin_lock_irqsave(&desc->lock, flags);
 811
 812                 chip = irq_data_get_irq_chip(&desc->irq_data);
 813                 if (chip && chip->irq_cpu_offline &&
 814                     (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
 815                      !irqd_irq_disabled(&desc->irq_data)))
 816                         chip->irq_cpu_offline(&desc->irq_data);
 817
 818                 raw_spin_unlock_irqrestore(&desc->lock, flags);
 819         }
 820 }