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