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                 goto out_unlock;
 384
 385         handle_irq_event(desc);
 386
 387         cond_unmask_irq(desc);
 388
 389 out_unlock:
 390         raw_spin_unlock(&desc->lock);
 391 }
 392 EXPORT_SYMBOL_GPL(handle_level_irq);
 393
 394 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 395 static inline void preflow_handler(struct irq_desc *desc)
 396 {
 397         if (desc->preflow_handler)
 398                 desc->preflow_handler(&desc->irq_data);
 399 }
 400 #else
 401 static inline void preflow_handler(struct irq_desc *desc) { }
 402 #endif
 403
 404 /**
 405  *      handle_fasteoi_irq - irq handler for transparent controllers
 406  *      @irq:   the interrupt number
 407  *      @desc:  the interrupt description structure for this irq
 408  *
 409  *      Only a single callback will be issued to the chip: an ->eoi()
 410  *      call when the interrupt has been serviced. This enables support
 411  *      for modern forms of interrupt handlers, which handle the flow
 412  *      details in hardware, transparently.
 413  */
 414 void
 415 handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
 416 {
 417         raw_spin_lock(&desc->lock);
 418
 419         if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
 420                 if (!irq_check_poll(desc))
 421                         goto out;
 422
 423         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 424         kstat_incr_irqs_this_cpu(irq, desc);
 425
 426         /*
 427          * If its disabled or no action available
 428          * then mask it and get out of here:
 429          */
 430         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
 431                 desc->istate |= IRQS_PENDING;
 432                 mask_irq(desc);
 433                 goto out;
 434         }
 435
 436         if (desc->istate & IRQS_ONESHOT)
 437                 mask_irq(desc);
 438
 439         preflow_handler(desc);
 440         handle_irq_event(desc);
 441
 442         if (desc->istate & IRQS_ONESHOT)
 443                 cond_unmask_irq(desc);
 444
 445 out_eoi:
 446         desc->irq_data.chip->irq_eoi(&desc->irq_data);
 447 out_unlock:
 448         raw_spin_unlock(&desc->lock);
 449         return;
 450 out:
 451         if (!(desc->irq_data.chip->flags & IRQCHIP_EOI_IF_HANDLED))
 452                 goto out_eoi;
 453         goto out_unlock;
 454 }
 455
 456 /**
 457  *      handle_edge_irq - edge type IRQ handler
 458  *      @irq:   the interrupt number
 459  *      @desc:  the interrupt description structure for this irq
 460  *
 461  *      Interrupt occures on the falling and/or rising edge of a hardware
 462  *      signal. The occurrence is latched into the irq controller hardware
 463  *      and must be acked in order to be reenabled. After the ack another
 464  *      interrupt can happen on the same source even before the first one
 465  *      is handled by the associated event handler. If this happens it
 466  *      might be necessary to disable (mask) the interrupt depending on the
 467  *      controller hardware. This requires to reenable the interrupt inside
 468  *      of the loop which handles the interrupts which have arrived while
 469  *      the handler was running. If all pending interrupts are handled, the
 470  *      loop is left.
 471  */
 472 void
 473 handle_edge_irq(unsigned int irq, struct irq_desc *desc)
 474 {
 475         raw_spin_lock(&desc->lock);
 476
 477         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 478         /*
 479          * If we're currently running this IRQ, or its disabled,
 480          * we shouldn't process the IRQ. Mark it pending, handle
 481          * the necessary masking and go out
 482          */
 483         if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
 484                      irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
 485                 if (!irq_check_poll(desc)) {
 486                         desc->istate |= IRQS_PENDING;
 487                         mask_ack_irq(desc);
 488                         goto out_unlock;
 489                 }
 490         }
 491         kstat_incr_irqs_this_cpu(irq, desc);
 492
 493         /* Start handling the irq */
 494         desc->irq_data.chip->irq_ack(&desc->irq_data);
 495
 496         do {
 497                 if (unlikely(!desc->action)) {
 498                         mask_irq(desc);
 499                         goto out_unlock;
 500                 }
 501
 502                 /*
 503                  * When another irq arrived while we were handling
 504                  * one, we could have masked the irq.
 505                  * Renable it, if it was not disabled in meantime.
 506                  */
 507                 if (unlikely(desc->istate & IRQS_PENDING)) {
 508                         if (!irqd_irq_disabled(&desc->irq_data) &&
 509                             irqd_irq_masked(&desc->irq_data))
 510                                 unmask_irq(desc);
 511                 }
 512
 513                 handle_irq_event(desc);
 514
 515         } while ((desc->istate & IRQS_PENDING) &&
 516                  !irqd_irq_disabled(&desc->irq_data));
 517
 518 out_unlock:
 519         raw_spin_unlock(&desc->lock);
 520 }
 521
 522 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
 523 /**
 524  *      handle_edge_eoi_irq - edge eoi type IRQ handler
 525  *      @irq:   the interrupt number
 526  *      @desc:  the interrupt description structure for this irq
 527  *
 528  * Similar as the above handle_edge_irq, but using eoi and w/o the
 529  * mask/unmask logic.
 530  */
 531 void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc)
 532 {
 533         struct irq_chip *chip = irq_desc_get_chip(desc);
 534
 535         raw_spin_lock(&desc->lock);
 536
 537         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 538         /*
 539          * If we're currently running this IRQ, or its disabled,
 540          * we shouldn't process the IRQ. Mark it pending, handle
 541          * the necessary masking and go out
 542          */
 543         if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
 544                      irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
 545                 if (!irq_check_poll(desc)) {
 546                         desc->istate |= IRQS_PENDING;
 547                         goto out_eoi;
 548                 }
 549         }
 550         kstat_incr_irqs_this_cpu(irq, desc);
 551
 552         do {
 553                 if (unlikely(!desc->action))
 554                         goto out_eoi;
 555
 556                 handle_irq_event(desc);
 557
 558         } while ((desc->istate & IRQS_PENDING) &&
 559                  !irqd_irq_disabled(&desc->irq_data));
 560
 561 out_eoi:
 562         chip->irq_eoi(&desc->irq_data);
 563         raw_spin_unlock(&desc->lock);
 564 }
 565 #endif
 566
 567 /**
 568  *      handle_percpu_irq - Per CPU local irq handler
 569  *      @irq:   the interrupt number
 570  *      @desc:  the interrupt description structure for this irq
 571  *
 572  *      Per CPU interrupts on SMP machines without locking requirements
 573  */
 574 void
 575 handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
 576 {
 577         struct irq_chip *chip = irq_desc_get_chip(desc);
 578
 579         kstat_incr_irqs_this_cpu(irq, desc);
 580
 581         if (chip->irq_ack)
 582                 chip->irq_ack(&desc->irq_data);
 583
 584         handle_irq_event_percpu(desc, desc->action);
 585
 586         if (chip->irq_eoi)
 587                 chip->irq_eoi(&desc->irq_data);
 588 }
 589
 590 /**
 591  * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
 592  * @irq:        the interrupt number
 593  * @desc:       the interrupt description structure for this irq
 594  *
 595  * Per CPU interrupts on SMP machines without locking requirements. Same as
 596  * handle_percpu_irq() above but with the following extras:
 597  *
 598  * action->percpu_dev_id is a pointer to percpu variables which
 599  * contain the real device id for the cpu on which this handler is
 600  * called
 601  */
 602 void handle_percpu_devid_irq(unsigned int irq, struct irq_desc *desc)
 603 {
 604         struct irq_chip *chip = irq_desc_get_chip(desc);
 605         struct irqaction *action = desc->action;
 606         void *dev_id = __this_cpu_ptr(action->percpu_dev_id);
 607         irqreturn_t res;
 608
 609         kstat_incr_irqs_this_cpu(irq, desc);
 610
 611         if (chip->irq_ack)
 612                 chip->irq_ack(&desc->irq_data);
 613
 614         trace_irq_handler_entry(irq, action);
 615         res = action->handler(irq, dev_id);
 616         trace_irq_handler_exit(irq, action, res);
 617
 618         if (chip->irq_eoi)
 619                 chip->irq_eoi(&desc->irq_data);
 620 }
 621
 622 void
 623 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 624                   const char *name)
 625 {
 626         unsigned long flags;
 627         struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
 628
 629         if (!desc)
 630                 return;
 631
 632         if (!handle) {
 633                 handle = handle_bad_irq;
 634         } else {
 635                 if (WARN_ON(desc->irq_data.chip == &no_irq_chip))
 636                         goto out;
 637         }
 638
 639         /* Uninstall? */
 640         if (handle == handle_bad_irq) {
 641                 if (desc->irq_data.chip != &no_irq_chip)
 642                         mask_ack_irq(desc);
 643                 irq_state_set_disabled(desc);
 644                 desc->depth = 1;
 645         }
 646         desc->handle_irq = handle;
 647         desc->name = name;
 648
 649         if (handle != handle_bad_irq && is_chained) {
 650                 irq_settings_set_noprobe(desc);
 651                 irq_settings_set_norequest(desc);
 652                 irq_settings_set_nothread(desc);
 653                 irq_startup(desc, true);
 654         }
 655 out:
 656         irq_put_desc_busunlock(desc, flags);
 657 }
 658 EXPORT_SYMBOL_GPL(__irq_set_handler);
 659
 660 void
 661 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
 662                               irq_flow_handler_t handle, const char *name)
 663 {
 664         irq_set_chip(irq, chip);
 665         __irq_set_handler(irq, handle, 0, name);
 666 }
 667
 668 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
 669 {
 670         unsigned long flags;
 671         struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
 672
 673         if (!desc)
 674                 return;
 675         irq_settings_clr_and_set(desc, clr, set);
 676
 677         irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
 678                    IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
 679         if (irq_settings_has_no_balance_set(desc))
 680                 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
 681         if (irq_settings_is_per_cpu(desc))
 682                 irqd_set(&desc->irq_data, IRQD_PER_CPU);
 683         if (irq_settings_can_move_pcntxt(desc))
 684                 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
 685         if (irq_settings_is_level(desc))
 686                 irqd_set(&desc->irq_data, IRQD_LEVEL);
 687
 688         irqd_set(&desc->irq_data, irq_settings_get_trigger_mask(desc));
 689
 690         irq_put_desc_unlock(desc, flags);
 691 }
 692 EXPORT_SYMBOL_GPL(irq_modify_status);
 693
 694 /**
 695  *      irq_cpu_online - Invoke all irq_cpu_online functions.
 696  *
 697  *      Iterate through all irqs and invoke the chip.irq_cpu_online()
 698  *      for each.
 699  */
 700 void irq_cpu_online(void)
 701 {
 702         struct irq_desc *desc;
 703         struct irq_chip *chip;
 704         unsigned long flags;
 705         unsigned int irq;
 706
 707         for_each_active_irq(irq) {
 708                 desc = irq_to_desc(irq);
 709                 if (!desc)
 710                         continue;
 711
 712                 raw_spin_lock_irqsave(&desc->lock, flags);
 713
 714                 chip = irq_data_get_irq_chip(&desc->irq_data);
 715                 if (chip && chip->irq_cpu_online &&
 716                     (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
 717                      !irqd_irq_disabled(&desc->irq_data)))
 718                         chip->irq_cpu_online(&desc->irq_data);
 719
 720                 raw_spin_unlock_irqrestore(&desc->lock, flags);
 721         }
 722 }
 723
 724 /**
 725  *      irq_cpu_offline - Invoke all irq_cpu_offline functions.
 726  *
 727  *      Iterate through all irqs and invoke the chip.irq_cpu_offline()
 728  *      for each.
 729  */
 730 void irq_cpu_offline(void)
 731 {
 732         struct irq_desc *desc;
 733         struct irq_chip *chip;
 734         unsigned long flags;
 735         unsigned int irq;
 736
 737         for_each_active_irq(irq) {
 738                 desc = irq_to_desc(irq);
 739                 if (!desc)
 740                         continue;
 741
 742                 raw_spin_lock_irqsave(&desc->lock, flags);
 743
 744                 chip = irq_data_get_irq_chip(&desc->irq_data);
 745                 if (chip && chip->irq_cpu_offline &&
 746                     (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
 747                      !irqd_irq_disabled(&desc->irq_data)))
 748                         chip->irq_cpu_offline(&desc->irq_data);
 749
 750                 raw_spin_unlock_irqrestore(&desc->lock, flags);
 751         }
 752 }