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