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         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 276         kstat_incr_irqs_this_cpu(irq, desc);
 277
 278         action = desc->action;
 279         if (unlikely(!action || irqd_irq_disabled(&desc->irq_data))) {
 280                 desc->istate |= IRQS_PENDING;
 281                 goto out_unlock;
 282         }
 283
 284         irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
 285         raw_spin_unlock_irq(&desc->lock);
 286
 287         action_ret = action->thread_fn(action->irq, action->dev_id);
 288         if (!noirqdebug)
 289                 note_interrupt(irq, desc, action_ret);
 290
 291         raw_spin_lock_irq(&desc->lock);
 292         irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
 293
 294 out_unlock:
 295         raw_spin_unlock_irq(&desc->lock);
 296 }
 297 EXPORT_SYMBOL_GPL(handle_nested_irq);
 298
 299 static bool irq_check_poll(struct irq_desc *desc)
 300 {
 301         if (!(desc->istate & IRQS_POLL_INPROGRESS))
 302                 return false;
 303         return irq_wait_for_poll(desc);
 304 }
 305
 306 /**
 307  *      handle_simple_irq - Simple and software-decoded IRQs.
 308  *      @irq:   the interrupt number
 309  *      @desc:  the interrupt description structure for this irq
 310  *
 311  *      Simple interrupts are either sent from a demultiplexing interrupt
 312  *      handler or come from hardware, where no interrupt hardware control
 313  *      is necessary.
 314  *
 315  *      Note: The caller is expected to handle the ack, clear, mask and
 316  *      unmask issues if necessary.
 317  */
 318 void
 319 handle_simple_irq(unsigned int irq, struct irq_desc *desc)
 320 {
 321         raw_spin_lock(&desc->lock);
 322
 323         if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
 324                 if (!irq_check_poll(desc))
 325                         goto out_unlock;
 326
 327         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 328         kstat_incr_irqs_this_cpu(irq, desc);
 329
 330         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
 331                 desc->istate |= IRQS_PENDING;
 332                 goto out_unlock;
 333         }
 334
 335         handle_irq_event(desc);
 336
 337 out_unlock:
 338         raw_spin_unlock(&desc->lock);
 339 }
 340 EXPORT_SYMBOL_GPL(handle_simple_irq);
 341
 342 /*
 343  * Called unconditionally from handle_level_irq() and only for oneshot
 344  * interrupts from handle_fasteoi_irq()
 345  */
 346 static void cond_unmask_irq(struct irq_desc *desc)
 347 {
 348         /*
 349          * We need to unmask in the following cases:
 350          * - Standard level irq (IRQF_ONESHOT is not set)
 351          * - Oneshot irq which did not wake the thread (caused by a
 352          *   spurious interrupt or a primary handler handling it
 353          *   completely).
 354          */
 355         if (!irqd_irq_disabled(&desc->irq_data) &&
 356             irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot)
 357                 unmask_irq(desc);
 358 }
 359
 360 /**
 361  *      handle_level_irq - Level type irq handler
 362  *      @irq:   the interrupt number
 363  *      @desc:  the interrupt description structure for this irq
 364  *
 365  *      Level type interrupts are active as long as the hardware line has
 366  *      the active level. This may require to mask the interrupt and unmask
 367  *      it after the associated handler has acknowledged the device, so the
 368  *      interrupt line is back to inactive.
 369  */
 370 void
 371 handle_level_irq(unsigned int irq, struct irq_desc *desc)
 372 {
 373         raw_spin_lock(&desc->lock);
 374         mask_ack_irq(desc);
 375
 376         if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
 377                 if (!irq_check_poll(desc))
 378                         goto out_unlock;
 379
 380         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 381         kstat_incr_irqs_this_cpu(irq, desc);
 382
 383         /*
 384          * If its disabled or no action available
 385          * keep it masked and get out of here
 386          */
 387         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
 388                 desc->istate |= IRQS_PENDING;
 389                 goto out_unlock;
 390         }
 391
 392         handle_irq_event(desc);
 393
 394         cond_unmask_irq(desc);
 395
 396 out_unlock:
 397         raw_spin_unlock(&desc->lock);
 398 }
 399 EXPORT_SYMBOL_GPL(handle_level_irq);
 400
 401 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 402 static inline void preflow_handler(struct irq_desc *desc)
 403 {
 404         if (desc->preflow_handler)
 405                 desc->preflow_handler(&desc->irq_data);
 406 }
 407 #else
 408 static inline void preflow_handler(struct irq_desc *desc) { }
 409 #endif
 410
 411 /**
 412  *      handle_fasteoi_irq - irq handler for transparent controllers
 413  *      @irq:   the interrupt number
 414  *      @desc:  the interrupt description structure for this irq
 415  *
 416  *      Only a single callback will be issued to the chip: an ->eoi()
 417  *      call when the interrupt has been serviced. This enables support
 418  *      for modern forms of interrupt handlers, which handle the flow
 419  *      details in hardware, transparently.
 420  */
 421 void
 422 handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
 423 {
 424         raw_spin_lock(&desc->lock);
 425
 426         if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
 427                 if (!irq_check_poll(desc))
 428                         goto out;
 429
 430         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 431         kstat_incr_irqs_this_cpu(irq, desc);
 432
 433         /*
 434          * If its disabled or no action available
 435          * then mask it and get out of here:
 436          */
 437         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
 438                 desc->istate |= IRQS_PENDING;
 439                 mask_irq(desc);
 440                 goto out;
 441         }
 442
 443         if (desc->istate & IRQS_ONESHOT)
 444                 mask_irq(desc);
 445
 446         preflow_handler(desc);
 447         handle_irq_event(desc);
 448
 449         if (desc->istate & IRQS_ONESHOT)
 450                 cond_unmask_irq(desc);
 451
 452 out_eoi:
 453         desc->irq_data.chip->irq_eoi(&desc->irq_data);
 454 out_unlock:
 455         raw_spin_unlock(&desc->lock);
 456         return;
 457 out:
 458         if (!(desc->irq_data.chip->flags & IRQCHIP_EOI_IF_HANDLED))
 459                 goto out_eoi;
 460         goto out_unlock;
 461 }
 462
 463 /**
 464  *      handle_edge_irq - edge type IRQ handler
 465  *      @irq:   the interrupt number
 466  *      @desc:  the interrupt description structure for this irq
 467  *
 468  *      Interrupt occures on the falling and/or rising edge of a hardware
 469  *      signal. The occurrence is latched into the irq controller hardware
 470  *      and must be acked in order to be reenabled. After the ack another
 471  *      interrupt can happen on the same source even before the first one
 472  *      is handled by the associated event handler. If this happens it
 473  *      might be necessary to disable (mask) the interrupt depending on the
 474  *      controller hardware. This requires to reenable the interrupt inside
 475  *      of the loop which handles the interrupts which have arrived while
 476  *      the handler was running. If all pending interrupts are handled, the
 477  *      loop is left.
 478  */
 479 void
 480 handle_edge_irq(unsigned int irq, struct irq_desc *desc)
 481 {
 482         raw_spin_lock(&desc->lock);
 483
 484         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 485         /*
 486          * If we're currently running this IRQ, or its disabled,
 487          * we shouldn't process the IRQ. Mark it pending, handle
 488          * the necessary masking and go out
 489          */
 490         if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
 491                      irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
 492                 if (!irq_check_poll(desc)) {
 493                         desc->istate |= IRQS_PENDING;
 494                         mask_ack_irq(desc);
 495                         goto out_unlock;
 496                 }
 497         }
 498         kstat_incr_irqs_this_cpu(irq, desc);
 499
 500         /* Start handling the irq */
 501         desc->irq_data.chip->irq_ack(&desc->irq_data);
 502
 503         do {
 504                 if (unlikely(!desc->action)) {
 505                         mask_irq(desc);
 506                         goto out_unlock;
 507                 }
 508
 509                 /*
 510                  * When another irq arrived while we were handling
 511                  * one, we could have masked the irq.
 512                  * Renable it, if it was not disabled in meantime.
 513                  */
 514                 if (unlikely(desc->istate & IRQS_PENDING)) {
 515                         if (!irqd_irq_disabled(&desc->irq_data) &&
 516                             irqd_irq_masked(&desc->irq_data))
 517                                 unmask_irq(desc);
 518                 }
 519
 520                 handle_irq_event(desc);
 521
 522         } while ((desc->istate & IRQS_PENDING) &&
 523                  !irqd_irq_disabled(&desc->irq_data));
 524
 525 out_unlock:
 526         raw_spin_unlock(&desc->lock);
 527 }
 528 EXPORT_SYMBOL(handle_edge_irq);
 529
 530 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
 531 /**
 532  *      handle_edge_eoi_irq - edge eoi type IRQ handler
 533  *      @irq:   the interrupt number
 534  *      @desc:  the interrupt description structure for this irq
 535  *
 536  * Similar as the above handle_edge_irq, but using eoi and w/o the
 537  * mask/unmask logic.
 538  */
 539 void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc)
 540 {
 541         struct irq_chip *chip = irq_desc_get_chip(desc);
 542
 543         raw_spin_lock(&desc->lock);
 544
 545         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 546         /*
 547          * If we're currently running this IRQ, or its disabled,
 548          * we shouldn't process the IRQ. Mark it pending, handle
 549          * the necessary masking and go out
 550          */
 551         if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
 552                      irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
 553                 if (!irq_check_poll(desc)) {
 554                         desc->istate |= IRQS_PENDING;
 555                         goto out_eoi;
 556                 }
 557         }
 558         kstat_incr_irqs_this_cpu(irq, desc);
 559
 560         do {
 561                 if (unlikely(!desc->action))
 562                         goto out_eoi;
 563
 564                 handle_irq_event(desc);
 565
 566         } while ((desc->istate & IRQS_PENDING) &&
 567                  !irqd_irq_disabled(&desc->irq_data));
 568
 569 out_eoi:
 570         chip->irq_eoi(&desc->irq_data);
 571         raw_spin_unlock(&desc->lock);
 572 }
 573 #endif
 574
 575 /**
 576  *      handle_percpu_irq - Per CPU local irq handler
 577  *      @irq:   the interrupt number
 578  *      @desc:  the interrupt description structure for this irq
 579  *
 580  *      Per CPU interrupts on SMP machines without locking requirements
 581  */
 582 void
 583 handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
 584 {
 585         struct irq_chip *chip = irq_desc_get_chip(desc);
 586
 587         kstat_incr_irqs_this_cpu(irq, desc);
 588
 589         if (chip->irq_ack)
 590                 chip->irq_ack(&desc->irq_data);
 591
 592         handle_irq_event_percpu(desc, desc->action);
 593
 594         if (chip->irq_eoi)
 595                 chip->irq_eoi(&desc->irq_data);
 596 }
 597
 598 /**
 599  * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
 600  * @irq:        the interrupt number
 601  * @desc:       the interrupt description structure for this irq
 602  *
 603  * Per CPU interrupts on SMP machines without locking requirements. Same as
 604  * handle_percpu_irq() above but with the following extras:
 605  *
 606  * action->percpu_dev_id is a pointer to percpu variables which
 607  * contain the real device id for the cpu on which this handler is
 608  * called
 609  */
 610 void handle_percpu_devid_irq(unsigned int irq, struct irq_desc *desc)
 611 {
 612         struct irq_chip *chip = irq_desc_get_chip(desc);
 613         struct irqaction *action = desc->action;
 614         void *dev_id = __this_cpu_ptr(action->percpu_dev_id);
 615         irqreturn_t res;
 616
 617         kstat_incr_irqs_this_cpu(irq, desc);
 618
 619         if (chip->irq_ack)
 620                 chip->irq_ack(&desc->irq_data);
 621
 622         trace_irq_handler_entry(irq, action);
 623         res = action->handler(irq, dev_id);
 624         trace_irq_handler_exit(irq, action, res);
 625
 626         if (chip->irq_eoi)
 627                 chip->irq_eoi(&desc->irq_data);
 628 }
 629
 630 void
 631 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 632                   const char *name)
 633 {
 634         unsigned long flags;
 635         struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
 636
 637         if (!desc)
 638                 return;
 639
 640         if (!handle) {
 641                 handle = handle_bad_irq;
 642         } else {
 643                 if (WARN_ON(desc->irq_data.chip == &no_irq_chip))
 644                         goto out;
 645         }
 646
 647         /* Uninstall? */
 648         if (handle == handle_bad_irq) {
 649                 if (desc->irq_data.chip != &no_irq_chip)
 650                         mask_ack_irq(desc);
 651                 irq_state_set_disabled(desc);
 652                 desc->depth = 1;
 653         }
 654         desc->handle_irq = handle;
 655         desc->name = name;
 656
 657         if (handle != handle_bad_irq && is_chained) {
 658                 irq_settings_set_noprobe(desc);
 659                 irq_settings_set_norequest(desc);
 660                 irq_settings_set_nothread(desc);
 661                 irq_startup(desc, true);
 662         }
 663 out:
 664         irq_put_desc_busunlock(desc, flags);
 665 }
 666 EXPORT_SYMBOL_GPL(__irq_set_handler);
 667
 668 void
 669 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
 670                               irq_flow_handler_t handle, const char *name)
 671 {
 672         irq_set_chip(irq, chip);
 673         __irq_set_handler(irq, handle, 0, name);
 674 }
 675 EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name);
 676
 677 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
 678 {
 679         unsigned long flags;
 680         struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
 681
 682         if (!desc)
 683                 return;
 684         irq_settings_clr_and_set(desc, clr, set);
 685
 686         irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
 687                    IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
 688         if (irq_settings_has_no_balance_set(desc))
 689                 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
 690         if (irq_settings_is_per_cpu(desc))
 691                 irqd_set(&desc->irq_data, IRQD_PER_CPU);
 692         if (irq_settings_can_move_pcntxt(desc))
 693                 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
 694         if (irq_settings_is_level(desc))
 695                 irqd_set(&desc->irq_data, IRQD_LEVEL);
 696
 697         irqd_set(&desc->irq_data, irq_settings_get_trigger_mask(desc));
 698
 699         irq_put_desc_unlock(desc, flags);
 700 }
 701 EXPORT_SYMBOL_GPL(irq_modify_status);
 702
 703 /**
 704  *      irq_cpu_online - Invoke all irq_cpu_online functions.
 705  *
 706  *      Iterate through all irqs and invoke the chip.irq_cpu_online()
 707  *      for each.
 708  */
 709 void irq_cpu_online(void)
 710 {
 711         struct irq_desc *desc;
 712         struct irq_chip *chip;
 713         unsigned long flags;
 714         unsigned int irq;
 715
 716         for_each_active_irq(irq) {
 717                 desc = irq_to_desc(irq);
 718                 if (!desc)
 719                         continue;
 720
 721                 raw_spin_lock_irqsave(&desc->lock, flags);
 722
 723                 chip = irq_data_get_irq_chip(&desc->irq_data);
 724                 if (chip && chip->irq_cpu_online &&
 725                     (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
 726                      !irqd_irq_disabled(&desc->irq_data)))
 727                         chip->irq_cpu_online(&desc->irq_data);
 728
 729                 raw_spin_unlock_irqrestore(&desc->lock, flags);
 730         }
 731 }
 732
 733 /**
 734  *      irq_cpu_offline - Invoke all irq_cpu_offline functions.
 735  *
 736  *      Iterate through all irqs and invoke the chip.irq_cpu_offline()
 737  *      for each.
 738  */
 739 void irq_cpu_offline(void)
 740 {
 741         struct irq_desc *desc;
 742         struct irq_chip *chip;
 743         unsigned long flags;
 744         unsigned int irq;
 745
 746         for_each_active_irq(irq) {
 747                 desc = irq_to_desc(irq);
 748                 if (!desc)
 749                         continue;
 750
 751                 raw_spin_lock_irqsave(&desc->lock, flags);
 752
 753                 chip = irq_data_get_irq_chip(&desc->irq_data);
 754                 if (chip && chip->irq_cpu_offline &&
 755                     (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
 756                      !irqd_irq_disabled(&desc->irq_data)))
 757                         chip->irq_cpu_offline(&desc->irq_data);
 758
 759                 raw_spin_unlock_irqrestore(&desc->lock, flags);
 760         }
 761 }