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                 desc->istate |= IRQS_PENDING;
 280                 goto out_unlock;
 281         }
 282
 283         irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
 284         raw_spin_unlock_irq(&desc->lock);
 285
 286         action_ret = action->thread_fn(action->irq, action->dev_id);
 287         if (!noirqdebug)
 288                 note_interrupt(irq, desc, action_ret);
 289
 290         raw_spin_lock_irq(&desc->lock);
 291         irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
 292
 293 out_unlock:
 294         raw_spin_unlock_irq(&desc->lock);
 295 }
 296 EXPORT_SYMBOL_GPL(handle_nested_irq);
 297
 298 static bool irq_check_poll(struct irq_desc *desc)
 299 {
 300         if (!(desc->istate & IRQS_POLL_INPROGRESS))
 301                 return false;
 302         return irq_wait_for_poll(desc);
 303 }
 304
 305 /**
 306  *      handle_simple_irq - Simple and software-decoded IRQs.
 307  *      @irq:   the interrupt number
 308  *      @desc:  the interrupt description structure for this irq
 309  *
 310  *      Simple interrupts are either sent from a demultiplexing interrupt
 311  *      handler or come from hardware, where no interrupt hardware control
 312  *      is necessary.
 313  *
 314  *      Note: The caller is expected to handle the ack, clear, mask and
 315  *      unmask issues if necessary.
 316  */
 317 void
 318 handle_simple_irq(unsigned int irq, struct irq_desc *desc)
 319 {
 320         raw_spin_lock(&desc->lock);
 321
 322         if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
 323                 if (!irq_check_poll(desc))
 324                         goto out_unlock;
 325
 326         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 327         kstat_incr_irqs_this_cpu(irq, desc);
 328
 329         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
 330                 desc->istate |= IRQS_PENDING;
 331                 goto out_unlock;
 332         }
 333
 334         handle_irq_event(desc);
 335
 336 out_unlock:
 337         raw_spin_unlock(&desc->lock);
 338 }
 339 EXPORT_SYMBOL_GPL(handle_simple_irq);
 340
 341 /*
 342  * Called unconditionally from handle_level_irq() and only for oneshot
 343  * interrupts from handle_fasteoi_irq()
 344  */
 345 static void cond_unmask_irq(struct irq_desc *desc)
 346 {
 347         /*
 348          * We need to unmask in the following cases:
 349          * - Standard level irq (IRQF_ONESHOT is not set)
 350          * - Oneshot irq which did not wake the thread (caused by a
 351          *   spurious interrupt or a primary handler handling it
 352          *   completely).
 353          */
 354         if (!irqd_irq_disabled(&desc->irq_data) &&
 355             irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot)
 356                 unmask_irq(desc);
 357 }
 358
 359 /**
 360  *      handle_level_irq - Level type irq handler
 361  *      @irq:   the interrupt number
 362  *      @desc:  the interrupt description structure for this irq
 363  *
 364  *      Level type interrupts are active as long as the hardware line has
 365  *      the active level. This may require to mask the interrupt and unmask
 366  *      it after the associated handler has acknowledged the device, so the
 367  *      interrupt line is back to inactive.
 368  */
 369 void
 370 handle_level_irq(unsigned int irq, struct irq_desc *desc)
 371 {
 372         raw_spin_lock(&desc->lock);
 373         mask_ack_irq(desc);
 374
 375         if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
 376                 if (!irq_check_poll(desc))
 377                         goto out_unlock;
 378
 379         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 380         kstat_incr_irqs_this_cpu(irq, desc);
 381
 382         /*
 383          * If its disabled or no action available
 384          * keep it masked and get out of here
 385          */
 386         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
 387                 desc->istate |= IRQS_PENDING;
 388                 goto out_unlock;
 389         }
 390
 391         handle_irq_event(desc);
 392
 393         cond_unmask_irq(desc);
 394
 395 out_unlock:
 396         raw_spin_unlock(&desc->lock);
 397 }
 398 EXPORT_SYMBOL_GPL(handle_level_irq);
 399
 400 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 401 static inline void preflow_handler(struct irq_desc *desc)
 402 {
 403         if (desc->preflow_handler)
 404                 desc->preflow_handler(&desc->irq_data);
 405 }
 406 #else
 407 static inline void preflow_handler(struct irq_desc *desc) { }
 408 #endif
 409
 410 /**
 411  *      handle_fasteoi_irq - irq handler for transparent controllers
 412  *      @irq:   the interrupt number
 413  *      @desc:  the interrupt description structure for this irq
 414  *
 415  *      Only a single callback will be issued to the chip: an ->eoi()
 416  *      call when the interrupt has been serviced. This enables support
 417  *      for modern forms of interrupt handlers, which handle the flow
 418  *      details in hardware, transparently.
 419  */
 420 void
 421 handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
 422 {
 423         raw_spin_lock(&desc->lock);
 424
 425         if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
 426                 if (!irq_check_poll(desc))
 427                         goto out;
 428
 429         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 430         kstat_incr_irqs_this_cpu(irq, desc);
 431
 432         /*
 433          * If its disabled or no action available
 434          * then mask it and get out of here:
 435          */
 436         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
 437                 desc->istate |= IRQS_PENDING;
 438                 mask_irq(desc);
 439                 goto out;
 440         }
 441
 442         if (desc->istate & IRQS_ONESHOT)
 443                 mask_irq(desc);
 444
 445         preflow_handler(desc);
 446         handle_irq_event(desc);
 447
 448         if (desc->istate & IRQS_ONESHOT)
 449                 cond_unmask_irq(desc);
 450
 451 out_eoi:
 452         desc->irq_data.chip->irq_eoi(&desc->irq_data);
 453 out_unlock:
 454         raw_spin_unlock(&desc->lock);
 455         return;
 456 out:
 457         if (!(desc->irq_data.chip->flags & IRQCHIP_EOI_IF_HANDLED))
 458                 goto out_eoi;
 459         goto out_unlock;
 460 }
 461
 462 /**
 463  *      handle_edge_irq - edge type IRQ handler
 464  *      @irq:   the interrupt number
 465  *      @desc:  the interrupt description structure for this irq
 466  *
 467  *      Interrupt occures on the falling and/or rising edge of a hardware
 468  *      signal. The occurrence is latched into the irq controller hardware
 469  *      and must be acked in order to be reenabled. After the ack another
 470  *      interrupt can happen on the same source even before the first one
 471  *      is handled by the associated event handler. If this happens it
 472  *      might be necessary to disable (mask) the interrupt depending on the
 473  *      controller hardware. This requires to reenable the interrupt inside
 474  *      of the loop which handles the interrupts which have arrived while
 475  *      the handler was running. If all pending interrupts are handled, the
 476  *      loop is left.
 477  */
 478 void
 479 handle_edge_irq(unsigned int irq, struct irq_desc *desc)
 480 {
 481         raw_spin_lock(&desc->lock);
 482
 483         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 484         /*
 485          * If we're currently running this IRQ, or its disabled,
 486          * we shouldn't process the IRQ. Mark it pending, handle
 487          * the necessary masking and go out
 488          */
 489         if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
 490                      irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
 491                 if (!irq_check_poll(desc)) {
 492                         desc->istate |= IRQS_PENDING;
 493                         mask_ack_irq(desc);
 494                         goto out_unlock;
 495                 }
 496         }
 497         kstat_incr_irqs_this_cpu(irq, desc);
 498
 499         /* Start handling the irq */
 500         desc->irq_data.chip->irq_ack(&desc->irq_data);
 501
 502         do {
 503                 if (unlikely(!desc->action)) {
 504                         mask_irq(desc);
 505                         goto out_unlock;
 506                 }
 507
 508                 /*
 509                  * When another irq arrived while we were handling
 510                  * one, we could have masked the irq.
 511                  * Renable it, if it was not disabled in meantime.
 512                  */
 513                 if (unlikely(desc->istate & IRQS_PENDING)) {
 514                         if (!irqd_irq_disabled(&desc->irq_data) &&
 515                             irqd_irq_masked(&desc->irq_data))
 516                                 unmask_irq(desc);
 517                 }
 518
 519                 handle_irq_event(desc);
 520
 521         } while ((desc->istate & IRQS_PENDING) &&
 522                  !irqd_irq_disabled(&desc->irq_data));
 523
 524 out_unlock:
 525         raw_spin_unlock(&desc->lock);
 526 }
 527 EXPORT_SYMBOL(handle_edge_irq);
 528
 529 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
 530 /**
 531  *      handle_edge_eoi_irq - edge eoi type IRQ handler
 532  *      @irq:   the interrupt number
 533  *      @desc:  the interrupt description structure for this irq
 534  *
 535  * Similar as the above handle_edge_irq, but using eoi and w/o the
 536  * mask/unmask logic.
 537  */
 538 void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc)
 539 {
 540         struct irq_chip *chip = irq_desc_get_chip(desc);
 541
 542         raw_spin_lock(&desc->lock);
 543
 544         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 545         /*
 546          * If we're currently running this IRQ, or its disabled,
 547          * we shouldn't process the IRQ. Mark it pending, handle
 548          * the necessary masking and go out
 549          */
 550         if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
 551                      irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
 552                 if (!irq_check_poll(desc)) {
 553                         desc->istate |= IRQS_PENDING;
 554                         goto out_eoi;
 555                 }
 556         }
 557         kstat_incr_irqs_this_cpu(irq, desc);
 558
 559         do {
 560                 if (unlikely(!desc->action))
 561                         goto out_eoi;
 562
 563                 handle_irq_event(desc);
 564
 565         } while ((desc->istate & IRQS_PENDING) &&
 566                  !irqd_irq_disabled(&desc->irq_data));
 567
 568 out_eoi:
 569         chip->irq_eoi(&desc->irq_data);
 570         raw_spin_unlock(&desc->lock);
 571 }
 572 #endif
 573
 574 /**
 575  *      handle_percpu_irq - Per CPU local irq handler
 576  *      @irq:   the interrupt number
 577  *      @desc:  the interrupt description structure for this irq
 578  *
 579  *      Per CPU interrupts on SMP machines without locking requirements
 580  */
 581 void
 582 handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
 583 {
 584         struct irq_chip *chip = irq_desc_get_chip(desc);
 585
 586         kstat_incr_irqs_this_cpu(irq, desc);
 587
 588         if (chip->irq_ack)
 589                 chip->irq_ack(&desc->irq_data);
 590
 591         handle_irq_event_percpu(desc, desc->action);
 592
 593         if (chip->irq_eoi)
 594                 chip->irq_eoi(&desc->irq_data);
 595 }
 596
 597 /**
 598  * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
 599  * @irq:        the interrupt number
 600  * @desc:       the interrupt description structure for this irq
 601  *
 602  * Per CPU interrupts on SMP machines without locking requirements. Same as
 603  * handle_percpu_irq() above but with the following extras:
 604  *
 605  * action->percpu_dev_id is a pointer to percpu variables which
 606  * contain the real device id for the cpu on which this handler is
 607  * called
 608  */
 609 void handle_percpu_devid_irq(unsigned int irq, struct irq_desc *desc)
 610 {
 611         struct irq_chip *chip = irq_desc_get_chip(desc);
 612         struct irqaction *action = desc->action;
 613         void *dev_id = __this_cpu_ptr(action->percpu_dev_id);
 614         irqreturn_t res;
 615
 616         kstat_incr_irqs_this_cpu(irq, desc);
 617
 618         if (chip->irq_ack)
 619                 chip->irq_ack(&desc->irq_data);
 620
 621         trace_irq_handler_entry(irq, action);
 622         res = action->handler(irq, dev_id);
 623         trace_irq_handler_exit(irq, action, res);
 624
 625         if (chip->irq_eoi)
 626                 chip->irq_eoi(&desc->irq_data);
 627 }
 628
 629 void
 630 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 631                   const char *name)
 632 {
 633         unsigned long flags;
 634         struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
 635
 636         if (!desc)
 637                 return;
 638
 639         if (!handle) {
 640                 handle = handle_bad_irq;
 641         } else {
 642                 if (WARN_ON(desc->irq_data.chip == &no_irq_chip))
 643                         goto out;
 644         }
 645
 646         /* Uninstall? */
 647         if (handle == handle_bad_irq) {
 648                 if (desc->irq_data.chip != &no_irq_chip)
 649                         mask_ack_irq(desc);
 650                 irq_state_set_disabled(desc);
 651                 desc->depth = 1;
 652         }
 653         desc->handle_irq = handle;
 654         desc->name = name;
 655
 656         if (handle != handle_bad_irq && is_chained) {
 657                 irq_settings_set_noprobe(desc);
 658                 irq_settings_set_norequest(desc);
 659                 irq_settings_set_nothread(desc);
 660                 irq_startup(desc, true);
 661         }
 662 out:
 663         irq_put_desc_busunlock(desc, flags);
 664 }
 665 EXPORT_SYMBOL_GPL(__irq_set_handler);
 666
 667 void
 668 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
 669                               irq_flow_handler_t handle, const char *name)
 670 {
 671         irq_set_chip(irq, chip);
 672         __irq_set_handler(irq, handle, 0, name);
 673 }
 674
 675 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
 676 {
 677         unsigned long flags;
 678         struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
 679
 680         if (!desc)
 681                 return;
 682         irq_settings_clr_and_set(desc, clr, set);
 683
 684         irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
 685                    IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
 686         if (irq_settings_has_no_balance_set(desc))
 687                 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
 688         if (irq_settings_is_per_cpu(desc))
 689                 irqd_set(&desc->irq_data, IRQD_PER_CPU);
 690         if (irq_settings_can_move_pcntxt(desc))
 691                 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
 692         if (irq_settings_is_level(desc))
 693                 irqd_set(&desc->irq_data, IRQD_LEVEL);
 694
 695         irqd_set(&desc->irq_data, irq_settings_get_trigger_mask(desc));
 696
 697         irq_put_desc_unlock(desc, flags);
 698 }
 699 EXPORT_SYMBOL_GPL(irq_modify_status);
 700
 701 /**
 702  *      irq_cpu_online - Invoke all irq_cpu_online functions.
 703  *
 704  *      Iterate through all irqs and invoke the chip.irq_cpu_online()
 705  *      for each.
 706  */
 707 void irq_cpu_online(void)
 708 {
 709         struct irq_desc *desc;
 710         struct irq_chip *chip;
 711         unsigned long flags;
 712         unsigned int irq;
 713
 714         for_each_active_irq(irq) {
 715                 desc = irq_to_desc(irq);
 716                 if (!desc)
 717                         continue;
 718
 719                 raw_spin_lock_irqsave(&desc->lock, flags);
 720
 721                 chip = irq_data_get_irq_chip(&desc->irq_data);
 722                 if (chip && chip->irq_cpu_online &&
 723                     (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
 724                      !irqd_irq_disabled(&desc->irq_data)))
 725                         chip->irq_cpu_online(&desc->irq_data);
 726
 727                 raw_spin_unlock_irqrestore(&desc->lock, flags);
 728         }
 729 }
 730
 731 /**
 732  *      irq_cpu_offline - Invoke all irq_cpu_offline functions.
 733  *
 734  *      Iterate through all irqs and invoke the chip.irq_cpu_offline()
 735  *      for each.
 736  */
 737 void irq_cpu_offline(void)
 738 {
 739         struct irq_desc *desc;
 740         struct irq_chip *chip;
 741         unsigned long flags;
 742         unsigned int irq;
 743
 744         for_each_active_irq(irq) {
 745                 desc = irq_to_desc(irq);
 746                 if (!desc)
 747                         continue;
 748
 749                 raw_spin_lock_irqsave(&desc->lock, flags);
 750
 751                 chip = irq_data_get_irq_chip(&desc->irq_data);
 752                 if (chip && chip->irq_cpu_offline &&
 753                     (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
 754                      !irqd_irq_disabled(&desc->irq_data)))
 755                         chip->irq_cpu_offline(&desc->irq_data);
 756
 757                 raw_spin_unlock_irqrestore(&desc->lock, flags);
 758         }
 759 }