linux/kernel/irq/chip.c
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   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 */
  28int 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}
  49EXPORT_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 */
  56int 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}
  70EXPORT_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 */
  79int 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}
  90EXPORT_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 */
  99int 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 */
 120int 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}
 131EXPORT_SYMBOL(irq_set_chip_data);
 132
 133struct 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}
 139EXPORT_SYMBOL_GPL(irq_get_irq_data);
 140
 141static void irq_state_clr_disabled(struct irq_desc *desc)
 142{
 143        irqd_clear(&desc->irq_data, IRQD_IRQ_DISABLED);
 144}
 145
 146static void irq_state_set_disabled(struct irq_desc *desc)
 147{
 148        irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
 149}
 150
 151static void irq_state_clr_masked(struct irq_desc *desc)
 152{
 153        irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED);
 154}
 155
 156static void irq_state_set_masked(struct irq_desc *desc)
 157{
 158        irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
 159}
 160
 161int 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
 179void 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
 192void 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
 202void 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
 211void 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
 220void 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
 229static 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
 241void 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
 249void 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 */
 265void 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
 293out_unlock:
 294        raw_spin_unlock_irq(&desc->lock);
 295}
 296EXPORT_SYMBOL_GPL(handle_nested_irq);
 297
 298static 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 */
 317void
 318handle_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
 336out_unlock:
 337        raw_spin_unlock(&desc->lock);
 338}
 339EXPORT_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 */
 345static 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 */
 369void
 370handle_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
 395out_unlock:
 396        raw_spin_unlock(&desc->lock);
 397}
 398EXPORT_SYMBOL_GPL(handle_level_irq);
 399
 400#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 401static inline void preflow_handler(struct irq_desc *desc)
 402{
 403        if (desc->preflow_handler)
 404                desc->preflow_handler(&desc->irq_data);
 405}
 406#else
 407static 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 */
 420void
 421handle_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
 451out_eoi:
 452        desc->irq_data.chip->irq_eoi(&desc->irq_data);
 453out_unlock:
 454        raw_spin_unlock(&desc->lock);
 455        return;
 456out:
 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 */
 478void
 479handle_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
 524out_unlock:
 525        raw_spin_unlock(&desc->lock);
 526}
 527EXPORT_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 */
 538void 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
 568out_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 */
 581void
 582handle_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 */
 609void 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
 629void
 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        }
 662out:
 663        irq_put_desc_busunlock(desc, flags);
 664}
 665EXPORT_SYMBOL_GPL(__irq_set_handler);
 666
 667void
 668irq_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}
 674EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name);
 675
 676void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
 677{
 678        unsigned long flags;
 679        struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
 680
 681        if (!desc)
 682                return;
 683        irq_settings_clr_and_set(desc, clr, set);
 684
 685        irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
 686                   IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
 687        if (irq_settings_has_no_balance_set(desc))
 688                irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
 689        if (irq_settings_is_per_cpu(desc))
 690                irqd_set(&desc->irq_data, IRQD_PER_CPU);
 691        if (irq_settings_can_move_pcntxt(desc))
 692                irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
 693        if (irq_settings_is_level(desc))
 694                irqd_set(&desc->irq_data, IRQD_LEVEL);
 695
 696        irqd_set(&desc->irq_data, irq_settings_get_trigger_mask(desc));
 697
 698        irq_put_desc_unlock(desc, flags);
 699}
 700EXPORT_SYMBOL_GPL(irq_modify_status);
 701
 702/**
 703 *      irq_cpu_online - Invoke all irq_cpu_online functions.
 704 *
 705 *      Iterate through all irqs and invoke the chip.irq_cpu_online()
 706 *      for each.
 707 */
 708void irq_cpu_online(void)
 709{
 710        struct irq_desc *desc;
 711        struct irq_chip *chip;
 712        unsigned long flags;
 713        unsigned int irq;
 714
 715        for_each_active_irq(irq) {
 716                desc = irq_to_desc(irq);
 717                if (!desc)
 718                        continue;
 719
 720                raw_spin_lock_irqsave(&desc->lock, flags);
 721
 722                chip = irq_data_get_irq_chip(&desc->irq_data);
 723                if (chip && chip->irq_cpu_online &&
 724                    (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
 725                     !irqd_irq_disabled(&desc->irq_data)))
 726                        chip->irq_cpu_online(&desc->irq_data);
 727
 728                raw_spin_unlock_irqrestore(&desc->lock, flags);
 729        }
 730}
 731
 732/**
 733 *      irq_cpu_offline - Invoke all irq_cpu_offline functions.
 734 *
 735 *      Iterate through all irqs and invoke the chip.irq_cpu_offline()
 736 *      for each.
 737 */
 738void irq_cpu_offline(void)
 739{
 740        struct irq_desc *desc;
 741        struct irq_chip *chip;
 742        unsigned long flags;
 743        unsigned int irq;
 744
 745        for_each_active_irq(irq) {
 746                desc = irq_to_desc(irq);
 747                if (!desc)
 748                        continue;
 749
 750                raw_spin_lock_irqsave(&desc->lock, flags);
 751
 752                chip = irq_data_get_irq_chip(&desc->irq_data);
 753                if (chip && chip->irq_cpu_offline &&
 754                    (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
 755                     !irqd_irq_disabled(&desc->irq_data)))
 756                        chip->irq_cpu_offline(&desc->irq_data);
 757
 758                raw_spin_unlock_irqrestore(&desc->lock, flags);
 759        }
 760}
 761
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