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)
 161 {
 162         irq_state_clr_disabled(desc);
 163         desc->depth = 0;
 164
 165         if (desc->irq_data.chip->irq_startup) {
 166                 int ret = desc->irq_data.chip->irq_startup(&desc->irq_data);
 167                 irq_state_clr_masked(desc);
 168                 return ret;
 169         }
 170
 171         irq_enable(desc);
 172         return 0;
 173 }
 174
 175 void irq_shutdown(struct irq_desc *desc)
 176 {
 177         irq_state_set_disabled(desc);
 178         desc->depth = 1;
 179         if (desc->irq_data.chip->irq_shutdown)
 180                 desc->irq_data.chip->irq_shutdown(&desc->irq_data);
 181         else if (desc->irq_data.chip->irq_disable)
 182                 desc->irq_data.chip->irq_disable(&desc->irq_data);
 183         else
 184                 desc->irq_data.chip->irq_mask(&desc->irq_data);
 185         irq_state_set_masked(desc);
 186 }
 187
 188 void irq_enable(struct irq_desc *desc)
 189 {
 190         irq_state_clr_disabled(desc);
 191         if (desc->irq_data.chip->irq_enable)
 192                 desc->irq_data.chip->irq_enable(&desc->irq_data);
 193         else
 194                 desc->irq_data.chip->irq_unmask(&desc->irq_data);
 195         irq_state_clr_masked(desc);
 196 }
 197
 198 void irq_disable(struct irq_desc *desc)
 199 {
 200         irq_state_set_disabled(desc);
 201         if (desc->irq_data.chip->irq_disable) {
 202                 desc->irq_data.chip->irq_disable(&desc->irq_data);
 203                 irq_state_set_masked(desc);
 204         }
 205 }
 206
 207 void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu)
 208 {
 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         cpumask_set_cpu(cpu, desc->percpu_enabled);
 214 }
 215
 216 void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu)
 217 {
 218         if (desc->irq_data.chip->irq_disable)
 219                 desc->irq_data.chip->irq_disable(&desc->irq_data);
 220         else
 221                 desc->irq_data.chip->irq_mask(&desc->irq_data);
 222         cpumask_clear_cpu(cpu, desc->percpu_enabled);
 223 }
 224
 225 static inline void mask_ack_irq(struct irq_desc *desc)
 226 {
 227         if (desc->irq_data.chip->irq_mask_ack)
 228                 desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
 229         else {
 230                 desc->irq_data.chip->irq_mask(&desc->irq_data);
 231                 if (desc->irq_data.chip->irq_ack)
 232                         desc->irq_data.chip->irq_ack(&desc->irq_data);
 233         }
 234         irq_state_set_masked(desc);
 235 }
 236
 237 void mask_irq(struct irq_desc *desc)
 238 {
 239         if (desc->irq_data.chip->irq_mask) {
 240                 desc->irq_data.chip->irq_mask(&desc->irq_data);
 241                 irq_state_set_masked(desc);
 242         }
 243 }
 244
 245 void unmask_irq(struct irq_desc *desc)
 246 {
 247         if (desc->irq_data.chip->irq_unmask) {
 248                 desc->irq_data.chip->irq_unmask(&desc->irq_data);
 249                 irq_state_clr_masked(desc);
 250         }
 251 }
 252
 253 /*
 254  *      handle_nested_irq - Handle a nested irq from a irq thread
 255  *      @irq:   the interrupt number
 256  *
 257  *      Handle interrupts which are nested into a threaded interrupt
 258  *      handler. The handler function is called inside the calling
 259  *      threads context.
 260  */
 261 void handle_nested_irq(unsigned int irq)
 262 {
 263         struct irq_desc *desc = irq_to_desc(irq);
 264         struct irqaction *action;
 265         irqreturn_t action_ret;
 266
 267         might_sleep();
 268
 269         raw_spin_lock_irq(&desc->lock);
 270
 271         kstat_incr_irqs_this_cpu(irq, desc);
 272
 273         action = desc->action;
 274         if (unlikely(!action || irqd_irq_disabled(&desc->irq_data)))
 275                 goto out_unlock;
 276
 277         irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
 278         raw_spin_unlock_irq(&desc->lock);
 279
 280         action_ret = action->thread_fn(action->irq, action->dev_id);
 281         if (!noirqdebug)
 282                 note_interrupt(irq, desc, action_ret);
 283
 284         raw_spin_lock_irq(&desc->lock);
 285         irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
 286
 287 out_unlock:
 288         raw_spin_unlock_irq(&desc->lock);
 289 }
 290 EXPORT_SYMBOL_GPL(handle_nested_irq);
 291
 292 static bool irq_check_poll(struct irq_desc *desc)
 293 {
 294         if (!(desc->istate & IRQS_POLL_INPROGRESS))
 295                 return false;
 296         return irq_wait_for_poll(desc);
 297 }
 298
 299 /**
 300  *      handle_simple_irq - Simple and software-decoded IRQs.
 301  *      @irq:   the interrupt number
 302  *      @desc:  the interrupt description structure for this irq
 303  *
 304  *      Simple interrupts are either sent from a demultiplexing interrupt
 305  *      handler or come from hardware, where no interrupt hardware control
 306  *      is necessary.
 307  *
 308  *      Note: The caller is expected to handle the ack, clear, mask and
 309  *      unmask issues if necessary.
 310  */
 311 void
 312 handle_simple_irq(unsigned int irq, struct irq_desc *desc)
 313 {
 314         raw_spin_lock(&desc->lock);
 315
 316         if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
 317                 if (!irq_check_poll(desc))
 318                         goto out_unlock;
 319
 320         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 321         kstat_incr_irqs_this_cpu(irq, desc);
 322
 323         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data)))
 324                 goto out_unlock;
 325
 326         handle_irq_event(desc);
 327
 328 out_unlock:
 329         raw_spin_unlock(&desc->lock);
 330 }
 331 EXPORT_SYMBOL_GPL(handle_simple_irq);
 332
 333 /**
 334  *      handle_level_irq - Level type irq handler
 335  *      @irq:   the interrupt number
 336  *      @desc:  the interrupt description structure for this irq
 337  *
 338  *      Level type interrupts are active as long as the hardware line has
 339  *      the active level. This may require to mask the interrupt and unmask
 340  *      it after the associated handler has acknowledged the device, so the
 341  *      interrupt line is back to inactive.
 342  */
 343 void
 344 handle_level_irq(unsigned int irq, struct irq_desc *desc)
 345 {
 346         raw_spin_lock(&desc->lock);
 347         mask_ack_irq(desc);
 348
 349         if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
 350                 if (!irq_check_poll(desc))
 351                         goto out_unlock;
 352
 353         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 354         kstat_incr_irqs_this_cpu(irq, desc);
 355
 356         /*
 357          * If its disabled or no action available
 358          * keep it masked and get out of here
 359          */
 360         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data)))
 361                 goto out_unlock;
 362
 363         handle_irq_event(desc);
 364
 365         if (!irqd_irq_disabled(&desc->irq_data) && !(desc->istate & IRQS_ONESHOT))
 366                 unmask_irq(desc);
 367 out_unlock:
 368         raw_spin_unlock(&desc->lock);
 369 }
 370 EXPORT_SYMBOL_GPL(handle_level_irq);
 371
 372 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 373 static inline void preflow_handler(struct irq_desc *desc)
 374 {
 375         if (desc->preflow_handler)
 376                 desc->preflow_handler(&desc->irq_data);
 377 }
 378 #else
 379 static inline void preflow_handler(struct irq_desc *desc) { }
 380 #endif
 381
 382 /**
 383  *      handle_fasteoi_irq - irq handler for transparent controllers
 384  *      @irq:   the interrupt number
 385  *      @desc:  the interrupt description structure for this irq
 386  *
 387  *      Only a single callback will be issued to the chip: an ->eoi()
 388  *      call when the interrupt has been serviced. This enables support
 389  *      for modern forms of interrupt handlers, which handle the flow
 390  *      details in hardware, transparently.
 391  */
 392 void
 393 handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
 394 {
 395         raw_spin_lock(&desc->lock);
 396
 397         if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
 398                 if (!irq_check_poll(desc))
 399                         goto out;
 400
 401         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 402         kstat_incr_irqs_this_cpu(irq, desc);
 403
 404         /*
 405          * If its disabled or no action available
 406          * then mask it and get out of here:
 407          */
 408         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
 409                 desc->istate |= IRQS_PENDING;
 410                 mask_irq(desc);
 411                 goto out;
 412         }
 413
 414         if (desc->istate & IRQS_ONESHOT)
 415                 mask_irq(desc);
 416
 417         preflow_handler(desc);
 418         handle_irq_event(desc);
 419
 420 out_eoi:
 421         desc->irq_data.chip->irq_eoi(&desc->irq_data);
 422 out_unlock:
 423         raw_spin_unlock(&desc->lock);
 424         return;
 425 out:
 426         if (!(desc->irq_data.chip->flags & IRQCHIP_EOI_IF_HANDLED))
 427                 goto out_eoi;
 428         goto out_unlock;
 429 }
 430
 431 /**
 432  *      handle_edge_irq - edge type IRQ handler
 433  *      @irq:   the interrupt number
 434  *      @desc:  the interrupt description structure for this irq
 435  *
 436  *      Interrupt occures on the falling and/or rising edge of a hardware
 437  *      signal. The occurrence is latched into the irq controller hardware
 438  *      and must be acked in order to be reenabled. After the ack another
 439  *      interrupt can happen on the same source even before the first one
 440  *      is handled by the associated event handler. If this happens it
 441  *      might be necessary to disable (mask) the interrupt depending on the
 442  *      controller hardware. This requires to reenable the interrupt inside
 443  *      of the loop which handles the interrupts which have arrived while
 444  *      the handler was running. If all pending interrupts are handled, the
 445  *      loop is left.
 446  */
 447 void
 448 handle_edge_irq(unsigned int irq, struct irq_desc *desc)
 449 {
 450         raw_spin_lock(&desc->lock);
 451
 452         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 453         /*
 454          * If we're currently running this IRQ, or its disabled,
 455          * we shouldn't process the IRQ. Mark it pending, handle
 456          * the necessary masking and go out
 457          */
 458         if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
 459                      irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
 460                 if (!irq_check_poll(desc)) {
 461                         desc->istate |= IRQS_PENDING;
 462                         mask_ack_irq(desc);
 463                         goto out_unlock;
 464                 }
 465         }
 466         kstat_incr_irqs_this_cpu(irq, desc);
 467
 468         /* Start handling the irq */
 469         desc->irq_data.chip->irq_ack(&desc->irq_data);
 470
 471         do {
 472                 if (unlikely(!desc->action)) {
 473                         mask_irq(desc);
 474                         goto out_unlock;
 475                 }
 476
 477                 /*
 478                  * When another irq arrived while we were handling
 479                  * one, we could have masked the irq.
 480                  * Renable it, if it was not disabled in meantime.
 481                  */
 482                 if (unlikely(desc->istate & IRQS_PENDING)) {
 483                         if (!irqd_irq_disabled(&desc->irq_data) &&
 484                             irqd_irq_masked(&desc->irq_data))
 485                                 unmask_irq(desc);
 486                 }
 487
 488                 handle_irq_event(desc);
 489
 490         } while ((desc->istate & IRQS_PENDING) &&
 491                  !irqd_irq_disabled(&desc->irq_data));
 492
 493 out_unlock:
 494         raw_spin_unlock(&desc->lock);
 495 }
 496
 497 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
 498 /**
 499  *      handle_edge_eoi_irq - edge eoi type IRQ handler
 500  *      @irq:   the interrupt number
 501  *      @desc:  the interrupt description structure for this irq
 502  *
 503  * Similar as the above handle_edge_irq, but using eoi and w/o the
 504  * mask/unmask logic.
 505  */
 506 void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc)
 507 {
 508         struct irq_chip *chip = irq_desc_get_chip(desc);
 509
 510         raw_spin_lock(&desc->lock);
 511
 512         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 513         /*
 514          * If we're currently running this IRQ, or its disabled,
 515          * we shouldn't process the IRQ. Mark it pending, handle
 516          * the necessary masking and go out
 517          */
 518         if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
 519                      irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
 520                 if (!irq_check_poll(desc)) {
 521                         desc->istate |= IRQS_PENDING;
 522                         goto out_eoi;
 523                 }
 524         }
 525         kstat_incr_irqs_this_cpu(irq, desc);
 526
 527         do {
 528                 if (unlikely(!desc->action))
 529                         goto out_eoi;
 530
 531                 handle_irq_event(desc);
 532
 533         } while ((desc->istate & IRQS_PENDING) &&
 534                  !irqd_irq_disabled(&desc->irq_data));
 535
 536 out_eoi:
 537         chip->irq_eoi(&desc->irq_data);
 538         raw_spin_unlock(&desc->lock);
 539 }
 540 #endif
 541
 542 /**
 543  *      handle_percpu_irq - Per CPU local irq handler
 544  *      @irq:   the interrupt number
 545  *      @desc:  the interrupt description structure for this irq
 546  *
 547  *      Per CPU interrupts on SMP machines without locking requirements
 548  */
 549 void
 550 handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
 551 {
 552         struct irq_chip *chip = irq_desc_get_chip(desc);
 553
 554         kstat_incr_irqs_this_cpu(irq, desc);
 555
 556         if (chip->irq_ack)
 557                 chip->irq_ack(&desc->irq_data);
 558
 559         handle_irq_event_percpu(desc, desc->action);
 560
 561         if (chip->irq_eoi)
 562                 chip->irq_eoi(&desc->irq_data);
 563 }
 564
 565 /**
 566  * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
 567  * @irq:        the interrupt number
 568  * @desc:       the interrupt description structure for this irq
 569  *
 570  * Per CPU interrupts on SMP machines without locking requirements. Same as
 571  * handle_percpu_irq() above but with the following extras:
 572  *
 573  * action->percpu_dev_id is a pointer to percpu variables which
 574  * contain the real device id for the cpu on which this handler is
 575  * called
 576  */
 577 void handle_percpu_devid_irq(unsigned int irq, struct irq_desc *desc)
 578 {
 579         struct irq_chip *chip = irq_desc_get_chip(desc);
 580         struct irqaction *action = desc->action;
 581         void *dev_id = __this_cpu_ptr(action->percpu_dev_id);
 582         irqreturn_t res;
 583
 584         kstat_incr_irqs_this_cpu(irq, desc);
 585
 586         if (chip->irq_ack)
 587                 chip->irq_ack(&desc->irq_data);
 588
 589         trace_irq_handler_entry(irq, action);
 590         res = action->handler(irq, dev_id);
 591         trace_irq_handler_exit(irq, action, res);
 592
 593         if (chip->irq_eoi)
 594                 chip->irq_eoi(&desc->irq_data);
 595 }
 596
 597 void
 598 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 599                   const char *name)
 600 {
 601         unsigned long flags;
 602         struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
 603
 604         if (!desc)
 605                 return;
 606
 607         if (!handle) {
 608                 handle = handle_bad_irq;
 609         } else {
 610                 if (WARN_ON(desc->irq_data.chip == &no_irq_chip))
 611                         goto out;
 612         }
 613
 614         /* Uninstall? */
 615         if (handle == handle_bad_irq) {
 616                 if (desc->irq_data.chip != &no_irq_chip)
 617                         mask_ack_irq(desc);
 618                 irq_state_set_disabled(desc);
 619                 desc->depth = 1;
 620         }
 621         desc->handle_irq = handle;
 622         desc->name = name;
 623
 624         if (handle != handle_bad_irq && is_chained) {
 625                 irq_settings_set_noprobe(desc);
 626                 irq_settings_set_norequest(desc);
 627                 irq_settings_set_nothread(desc);
 628                 irq_startup(desc);
 629         }
 630 out:
 631         irq_put_desc_busunlock(desc, flags);
 632 }
 633 EXPORT_SYMBOL_GPL(__irq_set_handler);
 634
 635 void
 636 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
 637                               irq_flow_handler_t handle, const char *name)
 638 {
 639         irq_set_chip(irq, chip);
 640         __irq_set_handler(irq, handle, 0, name);
 641 }
 642
 643 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
 644 {
 645         unsigned long flags;
 646         struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
 647
 648         if (!desc)
 649                 return;
 650         irq_settings_clr_and_set(desc, clr, set);
 651
 652         irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
 653                    IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
 654         if (irq_settings_has_no_balance_set(desc))
 655                 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
 656         if (irq_settings_is_per_cpu(desc))
 657                 irqd_set(&desc->irq_data, IRQD_PER_CPU);
 658         if (irq_settings_can_move_pcntxt(desc))
 659                 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
 660         if (irq_settings_is_level(desc))
 661                 irqd_set(&desc->irq_data, IRQD_LEVEL);
 662
 663         irqd_set(&desc->irq_data, irq_settings_get_trigger_mask(desc));
 664
 665         irq_put_desc_unlock(desc, flags);
 666 }
 667 EXPORT_SYMBOL_GPL(irq_modify_status);
 668
 669 /**
 670  *      irq_cpu_online - Invoke all irq_cpu_online functions.
 671  *
 672  *      Iterate through all irqs and invoke the chip.irq_cpu_online()
 673  *      for each.
 674  */
 675 void irq_cpu_online(void)
 676 {
 677         struct irq_desc *desc;
 678         struct irq_chip *chip;
 679         unsigned long flags;
 680         unsigned int irq;
 681
 682         for_each_active_irq(irq) {
 683                 desc = irq_to_desc(irq);
 684                 if (!desc)
 685                         continue;
 686
 687                 raw_spin_lock_irqsave(&desc->lock, flags);
 688
 689                 chip = irq_data_get_irq_chip(&desc->irq_data);
 690                 if (chip && chip->irq_cpu_online &&
 691                     (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
 692                      !irqd_irq_disabled(&desc->irq_data)))
 693                         chip->irq_cpu_online(&desc->irq_data);
 694
 695                 raw_spin_unlock_irqrestore(&desc->lock, flags);
 696         }
 697 }
 698
 699 /**
 700  *      irq_cpu_offline - Invoke all irq_cpu_offline functions.
 701  *
 702  *      Iterate through all irqs and invoke the chip.irq_cpu_offline()
 703  *      for each.
 704  */
 705 void irq_cpu_offline(void)
 706 {
 707         struct irq_desc *desc;
 708         struct irq_chip *chip;
 709         unsigned long flags;
 710         unsigned int irq;
 711
 712         for_each_active_irq(irq) {
 713                 desc = irq_to_desc(irq);
 714                 if (!desc)
 715                         continue;
 716
 717                 raw_spin_lock_irqsave(&desc->lock, flags);
 718
 719                 chip = irq_data_get_irq_chip(&desc->irq_data);
 720                 if (chip && chip->irq_cpu_offline &&
 721                     (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
 722                      !irqd_irq_disabled(&desc->irq_data)))
 723                         chip->irq_cpu_offline(&desc->irq_data);
 724
 725                 raw_spin_unlock_irqrestore(&desc->lock, flags);
 726         }
 727 }