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.
  44          */
  45         irq_mark_irq(irq);
  46         return 0;
  47 }
  48 EXPORT_SYMBOL(irq_set_chip);
  49
  50 /**
  51  *      irq_set_type - set the irq trigger type for an irq
  52  *      @irq:   irq number
  53  *      @type:  IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
  54  */
  55 int irq_set_irq_type(unsigned int irq, unsigned int type)
  56 {
  57         unsigned long flags;
  58         struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
  59         int ret = 0;
  60
  61         if (!desc)
  62                 return -EINVAL;
  63
  64         type &= IRQ_TYPE_SENSE_MASK;
  65         ret = __irq_set_trigger(desc, irq, type);
  66         irq_put_desc_busunlock(desc, flags);
  67         return ret;
  68 }
  69 EXPORT_SYMBOL(irq_set_irq_type);
  70
  71 /**
  72  *      irq_set_handler_data - set irq handler data for an irq
  73  *      @irq:   Interrupt number
  74  *      @data:  Pointer to interrupt specific data
  75  *
  76  *      Set the hardware irq controller data for an irq
  77  */
  78 int irq_set_handler_data(unsigned int irq, void *data)
  79 {
  80         unsigned long flags;
  81         struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
  82
  83         if (!desc)
  84                 return -EINVAL;
  85         desc->irq_data.handler_data = data;
  86         irq_put_desc_unlock(desc, flags);
  87         return 0;
  88 }
  89 EXPORT_SYMBOL(irq_set_handler_data);
  90
  91 /**
  92  *      irq_set_msi_desc_off - set MSI descriptor data for an irq at offset
  93  *      @irq_base:      Interrupt number base
  94  *      @irq_offset:    Interrupt number offset
  95  *      @entry:         Pointer to MSI descriptor data
  96  *
  97  *      Set the MSI descriptor entry for an irq at offset
  98  */
  99 int irq_set_msi_desc_off(unsigned int irq_base, unsigned int irq_offset,
 100                          struct msi_desc *entry)
 101 {
 102         unsigned long flags;
 103         struct irq_desc *desc = irq_get_desc_lock(irq_base + irq_offset, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
 104
 105         if (!desc)
 106                 return -EINVAL;
 107         desc->irq_data.msi_desc = entry;
 108         if (entry && !irq_offset)
 109                 entry->irq = irq_base;
 110         irq_put_desc_unlock(desc, flags);
 111         return 0;
 112 }
 113
 114 /**
 115  *      irq_set_msi_desc - set MSI descriptor data for an irq
 116  *      @irq:   Interrupt number
 117  *      @entry: Pointer to MSI descriptor data
 118  *
 119  *      Set the MSI descriptor entry for an irq
 120  */
 121 int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
 122 {
 123         return irq_set_msi_desc_off(irq, 0, entry);
 124 }
 125
 126 /**
 127  *      irq_set_chip_data - set irq chip data for an irq
 128  *      @irq:   Interrupt number
 129  *      @data:  Pointer to chip specific data
 130  *
 131  *      Set the hardware irq chip data for an irq
 132  */
 133 int irq_set_chip_data(unsigned int irq, void *data)
 134 {
 135         unsigned long flags;
 136         struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
 137
 138         if (!desc)
 139                 return -EINVAL;
 140         desc->irq_data.chip_data = data;
 141         irq_put_desc_unlock(desc, flags);
 142         return 0;
 143 }
 144 EXPORT_SYMBOL(irq_set_chip_data);
 145
 146 struct irq_data *irq_get_irq_data(unsigned int irq)
 147 {
 148         struct irq_desc *desc = irq_to_desc(irq);
 149
 150         return desc ? &desc->irq_data : NULL;
 151 }
 152 EXPORT_SYMBOL_GPL(irq_get_irq_data);
 153
 154 static void irq_state_clr_disabled(struct irq_desc *desc)
 155 {
 156         irqd_clear(&desc->irq_data, IRQD_IRQ_DISABLED);
 157 }
 158
 159 static void irq_state_set_disabled(struct irq_desc *desc)
 160 {
 161         irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
 162 }
 163
 164 static void irq_state_clr_masked(struct irq_desc *desc)
 165 {
 166         irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED);
 167 }
 168
 169 static void irq_state_set_masked(struct irq_desc *desc)
 170 {
 171         irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
 172 }
 173
 174 int irq_startup(struct irq_desc *desc, bool resend)
 175 {
 176         int ret = 0;
 177
 178         irq_state_clr_disabled(desc);
 179         desc->depth = 0;
 180
 181         if (desc->irq_data.chip->irq_startup) {
 182                 ret = desc->irq_data.chip->irq_startup(&desc->irq_data);
 183                 irq_state_clr_masked(desc);
 184         } else {
 185                 irq_enable(desc);
 186         }
 187         if (resend)
 188                 check_irq_resend(desc, desc->irq_data.irq);
 189         return ret;
 190 }
 191
 192 void irq_shutdown(struct irq_desc *desc)
 193 {
 194         irq_state_set_disabled(desc);
 195         desc->depth = 1;
 196         if (desc->irq_data.chip->irq_shutdown)
 197                 desc->irq_data.chip->irq_shutdown(&desc->irq_data);
 198         else if (desc->irq_data.chip->irq_disable)
 199                 desc->irq_data.chip->irq_disable(&desc->irq_data);
 200         else
 201                 desc->irq_data.chip->irq_mask(&desc->irq_data);
 202         irq_state_set_masked(desc);
 203 }
 204
 205 void irq_enable(struct irq_desc *desc)
 206 {
 207         irq_state_clr_disabled(desc);
 208         if (desc->irq_data.chip->irq_enable)
 209                 desc->irq_data.chip->irq_enable(&desc->irq_data);
 210         else
 211                 desc->irq_data.chip->irq_unmask(&desc->irq_data);
 212         irq_state_clr_masked(desc);
 213 }
 214
 215 /**
 216  * irq_disable - Mark interrupt disabled
 217  * @desc:       irq descriptor which should be disabled
 218  *
 219  * If the chip does not implement the irq_disable callback, we
 220  * use a lazy disable approach. That means we mark the interrupt
 221  * disabled, but leave the hardware unmasked. That's an
 222  * optimization because we avoid the hardware access for the
 223  * common case where no interrupt happens after we marked it
 224  * disabled. If an interrupt happens, then the interrupt flow
 225  * handler masks the line at the hardware level and marks it
 226  * pending.
 227  */
 228 void irq_disable(struct irq_desc *desc)
 229 {
 230         irq_state_set_disabled(desc);
 231         if (desc->irq_data.chip->irq_disable) {
 232                 desc->irq_data.chip->irq_disable(&desc->irq_data);
 233                 irq_state_set_masked(desc);
 234         }
 235 }
 236
 237 void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu)
 238 {
 239         if (desc->irq_data.chip->irq_enable)
 240                 desc->irq_data.chip->irq_enable(&desc->irq_data);
 241         else
 242                 desc->irq_data.chip->irq_unmask(&desc->irq_data);
 243         cpumask_set_cpu(cpu, desc->percpu_enabled);
 244 }
 245
 246 void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu)
 247 {
 248         if (desc->irq_data.chip->irq_disable)
 249                 desc->irq_data.chip->irq_disable(&desc->irq_data);
 250         else
 251                 desc->irq_data.chip->irq_mask(&desc->irq_data);
 252         cpumask_clear_cpu(cpu, desc->percpu_enabled);
 253 }
 254
 255 static inline void mask_ack_irq(struct irq_desc *desc)
 256 {
 257         if (desc->irq_data.chip->irq_mask_ack)
 258                 desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
 259         else {
 260                 desc->irq_data.chip->irq_mask(&desc->irq_data);
 261                 if (desc->irq_data.chip->irq_ack)
 262                         desc->irq_data.chip->irq_ack(&desc->irq_data);
 263         }
 264         irq_state_set_masked(desc);
 265 }
 266
 267 void mask_irq(struct irq_desc *desc)
 268 {
 269         if (desc->irq_data.chip->irq_mask) {
 270                 desc->irq_data.chip->irq_mask(&desc->irq_data);
 271                 irq_state_set_masked(desc);
 272         }
 273 }
 274
 275 void unmask_irq(struct irq_desc *desc)
 276 {
 277         if (desc->irq_data.chip->irq_unmask) {
 278                 desc->irq_data.chip->irq_unmask(&desc->irq_data);
 279                 irq_state_clr_masked(desc);
 280         }
 281 }
 282
 283 void unmask_threaded_irq(struct irq_desc *desc)
 284 {
 285         struct irq_chip *chip = desc->irq_data.chip;
 286
 287         if (chip->flags & IRQCHIP_EOI_THREADED)
 288                 chip->irq_eoi(&desc->irq_data);
 289
 290         if (chip->irq_unmask) {
 291                 chip->irq_unmask(&desc->irq_data);
 292                 irq_state_clr_masked(desc);
 293         }
 294 }
 295
 296 /*
 297  *      handle_nested_irq - Handle a nested irq from a irq thread
 298  *      @irq:   the interrupt number
 299  *
 300  *      Handle interrupts which are nested into a threaded interrupt
 301  *      handler. The handler function is called inside the calling
 302  *      threads context.
 303  */
 304 void handle_nested_irq(unsigned int irq)
 305 {
 306         struct irq_desc *desc = irq_to_desc(irq);
 307         struct irqaction *action;
 308         irqreturn_t action_ret;
 309
 310         might_sleep();
 311
 312         raw_spin_lock_irq(&desc->lock);
 313
 314         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 315         kstat_incr_irqs_this_cpu(irq, desc);
 316
 317         action = desc->action;
 318         if (unlikely(!action || irqd_irq_disabled(&desc->irq_data))) {
 319                 desc->istate |= IRQS_PENDING;
 320                 goto out_unlock;
 321         }
 322
 323         irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
 324         raw_spin_unlock_irq(&desc->lock);
 325
 326         action_ret = action->thread_fn(action->irq, action->dev_id);
 327         if (!noirqdebug)
 328                 note_interrupt(irq, desc, action_ret);
 329
 330         raw_spin_lock_irq(&desc->lock);
 331         irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
 332
 333 out_unlock:
 334         raw_spin_unlock_irq(&desc->lock);
 335 }
 336 EXPORT_SYMBOL_GPL(handle_nested_irq);
 337
 338 static bool irq_check_poll(struct irq_desc *desc)
 339 {
 340         if (!(desc->istate & IRQS_POLL_INPROGRESS))
 341                 return false;
 342         return irq_wait_for_poll(desc);
 343 }
 344
 345 /**
 346  *      handle_simple_irq - Simple and software-decoded IRQs.
 347  *      @irq:   the interrupt number
 348  *      @desc:  the interrupt description structure for this irq
 349  *
 350  *      Simple interrupts are either sent from a demultiplexing interrupt
 351  *      handler or come from hardware, where no interrupt hardware control
 352  *      is necessary.
 353  *
 354  *      Note: The caller is expected to handle the ack, clear, mask and
 355  *      unmask issues if necessary.
 356  */
 357 void
 358 handle_simple_irq(unsigned int irq, struct irq_desc *desc)
 359 {
 360         raw_spin_lock(&desc->lock);
 361
 362         if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
 363                 if (!irq_check_poll(desc))
 364                         goto out_unlock;
 365
 366         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 367         kstat_incr_irqs_this_cpu(irq, desc);
 368
 369         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
 370                 desc->istate |= IRQS_PENDING;
 371                 goto out_unlock;
 372         }
 373
 374         handle_irq_event(desc);
 375
 376 out_unlock:
 377         raw_spin_unlock(&desc->lock);
 378 }
 379 EXPORT_SYMBOL_GPL(handle_simple_irq);
 380
 381 /*
 382  * Called unconditionally from handle_level_irq() and only for oneshot
 383  * interrupts from handle_fasteoi_irq()
 384  */
 385 static void cond_unmask_irq(struct irq_desc *desc)
 386 {
 387         /*
 388          * We need to unmask in the following cases:
 389          * - Standard level irq (IRQF_ONESHOT is not set)
 390          * - Oneshot irq which did not wake the thread (caused by a
 391          *   spurious interrupt or a primary handler handling it
 392          *   completely).
 393          */
 394         if (!irqd_irq_disabled(&desc->irq_data) &&
 395             irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot)
 396                 unmask_irq(desc);
 397 }
 398
 399 /**
 400  *      handle_level_irq - Level type irq handler
 401  *      @irq:   the interrupt number
 402  *      @desc:  the interrupt description structure for this irq
 403  *
 404  *      Level type interrupts are active as long as the hardware line has
 405  *      the active level. This may require to mask the interrupt and unmask
 406  *      it after the associated handler has acknowledged the device, so the
 407  *      interrupt line is back to inactive.
 408  */
 409 void
 410 handle_level_irq(unsigned int irq, struct irq_desc *desc)
 411 {
 412         raw_spin_lock(&desc->lock);
 413         mask_ack_irq(desc);
 414
 415         if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
 416                 if (!irq_check_poll(desc))
 417                         goto out_unlock;
 418
 419         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 420         kstat_incr_irqs_this_cpu(irq, desc);
 421
 422         /*
 423          * If its disabled or no action available
 424          * keep it masked and get out of here
 425          */
 426         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
 427                 desc->istate |= IRQS_PENDING;
 428                 goto out_unlock;
 429         }
 430
 431         handle_irq_event(desc);
 432
 433         cond_unmask_irq(desc);
 434
 435 out_unlock:
 436         raw_spin_unlock(&desc->lock);
 437 }
 438 EXPORT_SYMBOL_GPL(handle_level_irq);
 439
 440 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 441 static inline void preflow_handler(struct irq_desc *desc)
 442 {
 443         if (desc->preflow_handler)
 444                 desc->preflow_handler(&desc->irq_data);
 445 }
 446 #else
 447 static inline void preflow_handler(struct irq_desc *desc) { }
 448 #endif
 449
 450 static void cond_unmask_eoi_irq(struct irq_desc *desc, struct irq_chip *chip)
 451 {
 452         if (!(desc->istate & IRQS_ONESHOT)) {
 453                 chip->irq_eoi(&desc->irq_data);
 454                 return;
 455         }
 456         /*
 457          * We need to unmask in the following cases:
 458          * - Oneshot irq which did not wake the thread (caused by a
 459          *   spurious interrupt or a primary handler handling it
 460          *   completely).
 461          */
 462         if (!irqd_irq_disabled(&desc->irq_data) &&
 463             irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot) {
 464                 chip->irq_eoi(&desc->irq_data);
 465                 unmask_irq(desc);
 466         } else if (!(chip->flags & IRQCHIP_EOI_THREADED)) {
 467                 chip->irq_eoi(&desc->irq_data);
 468         }
 469 }
 470
 471 /**
 472  *      handle_fasteoi_irq - irq handler for transparent controllers
 473  *      @irq:   the interrupt number
 474  *      @desc:  the interrupt description structure for this irq
 475  *
 476  *      Only a single callback will be issued to the chip: an ->eoi()
 477  *      call when the interrupt has been serviced. This enables support
 478  *      for modern forms of interrupt handlers, which handle the flow
 479  *      details in hardware, transparently.
 480  */
 481 void
 482 handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
 483 {
 484         struct irq_chip *chip = desc->irq_data.chip;
 485
 486         raw_spin_lock(&desc->lock);
 487
 488         if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
 489                 if (!irq_check_poll(desc))
 490                         goto out;
 491
 492         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 493         kstat_incr_irqs_this_cpu(irq, desc);
 494
 495         /*
 496          * If its disabled or no action available
 497          * then mask it and get out of here:
 498          */
 499         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
 500                 desc->istate |= IRQS_PENDING;
 501                 mask_irq(desc);
 502                 goto out;
 503         }
 504
 505         if (desc->istate & IRQS_ONESHOT)
 506                 mask_irq(desc);
 507
 508         preflow_handler(desc);
 509         handle_irq_event(desc);
 510
 511         cond_unmask_eoi_irq(desc, chip);
 512
 513         raw_spin_unlock(&desc->lock);
 514         return;
 515 out:
 516         if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
 517                 chip->irq_eoi(&desc->irq_data);
 518         raw_spin_unlock(&desc->lock);
 519 }
 520 EXPORT_SYMBOL_GPL(handle_fasteoi_irq);
 521
 522 /**
 523  *      handle_edge_irq - edge type IRQ handler
 524  *      @irq:   the interrupt number
 525  *      @desc:  the interrupt description structure for this irq
 526  *
 527  *      Interrupt occures on the falling and/or rising edge of a hardware
 528  *      signal. The occurrence is latched into the irq controller hardware
 529  *      and must be acked in order to be reenabled. After the ack another
 530  *      interrupt can happen on the same source even before the first one
 531  *      is handled by the associated event handler. If this happens it
 532  *      might be necessary to disable (mask) the interrupt depending on the
 533  *      controller hardware. This requires to reenable the interrupt inside
 534  *      of the loop which handles the interrupts which have arrived while
 535  *      the handler was running. If all pending interrupts are handled, the
 536  *      loop is left.
 537  */
 538 void
 539 handle_edge_irq(unsigned int irq, struct irq_desc *desc)
 540 {
 541         raw_spin_lock(&desc->lock);
 542
 543         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 544         /*
 545          * If we're currently running this IRQ, or its disabled,
 546          * we shouldn't process the IRQ. Mark it pending, handle
 547          * the necessary masking and go out
 548          */
 549         if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
 550                      irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
 551                 if (!irq_check_poll(desc)) {
 552                         desc->istate |= IRQS_PENDING;
 553                         mask_ack_irq(desc);
 554                         goto out_unlock;
 555                 }
 556         }
 557         kstat_incr_irqs_this_cpu(irq, desc);
 558
 559         /* Start handling the irq */
 560         desc->irq_data.chip->irq_ack(&desc->irq_data);
 561
 562         do {
 563                 if (unlikely(!desc->action)) {
 564                         mask_irq(desc);
 565                         goto out_unlock;
 566                 }
 567
 568                 /*
 569                  * When another irq arrived while we were handling
 570                  * one, we could have masked the irq.
 571                  * Renable it, if it was not disabled in meantime.
 572                  */
 573                 if (unlikely(desc->istate & IRQS_PENDING)) {
 574                         if (!irqd_irq_disabled(&desc->irq_data) &&
 575                             irqd_irq_masked(&desc->irq_data))
 576                                 unmask_irq(desc);
 577                 }
 578
 579                 handle_irq_event(desc);
 580
 581         } while ((desc->istate & IRQS_PENDING) &&
 582                  !irqd_irq_disabled(&desc->irq_data));
 583
 584 out_unlock:
 585         raw_spin_unlock(&desc->lock);
 586 }
 587 EXPORT_SYMBOL(handle_edge_irq);
 588
 589 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
 590 /**
 591  *      handle_edge_eoi_irq - edge eoi type IRQ handler
 592  *      @irq:   the interrupt number
 593  *      @desc:  the interrupt description structure for this irq
 594  *
 595  * Similar as the above handle_edge_irq, but using eoi and w/o the
 596  * mask/unmask logic.
 597  */
 598 void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc)
 599 {
 600         struct irq_chip *chip = irq_desc_get_chip(desc);
 601
 602         raw_spin_lock(&desc->lock);
 603
 604         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 605         /*
 606          * If we're currently running this IRQ, or its disabled,
 607          * we shouldn't process the IRQ. Mark it pending, handle
 608          * the necessary masking and go out
 609          */
 610         if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
 611                      irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
 612                 if (!irq_check_poll(desc)) {
 613                         desc->istate |= IRQS_PENDING;
 614                         goto out_eoi;
 615                 }
 616         }
 617         kstat_incr_irqs_this_cpu(irq, desc);
 618
 619         do {
 620                 if (unlikely(!desc->action))
 621                         goto out_eoi;
 622
 623                 handle_irq_event(desc);
 624
 625         } while ((desc->istate & IRQS_PENDING) &&
 626                  !irqd_irq_disabled(&desc->irq_data));
 627
 628 out_eoi:
 629         chip->irq_eoi(&desc->irq_data);
 630         raw_spin_unlock(&desc->lock);
 631 }
 632 #endif
 633
 634 /**
 635  *      handle_percpu_irq - Per CPU local irq handler
 636  *      @irq:   the interrupt number
 637  *      @desc:  the interrupt description structure for this irq
 638  *
 639  *      Per CPU interrupts on SMP machines without locking requirements
 640  */
 641 void
 642 handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
 643 {
 644         struct irq_chip *chip = irq_desc_get_chip(desc);
 645
 646         kstat_incr_irqs_this_cpu(irq, desc);
 647
 648         if (chip->irq_ack)
 649                 chip->irq_ack(&desc->irq_data);
 650
 651         handle_irq_event_percpu(desc, desc->action);
 652
 653         if (chip->irq_eoi)
 654                 chip->irq_eoi(&desc->irq_data);
 655 }
 656
 657 /**
 658  * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
 659  * @irq:        the interrupt number
 660  * @desc:       the interrupt description structure for this irq
 661  *
 662  * Per CPU interrupts on SMP machines without locking requirements. Same as
 663  * handle_percpu_irq() above but with the following extras:
 664  *
 665  * action->percpu_dev_id is a pointer to percpu variables which
 666  * contain the real device id for the cpu on which this handler is
 667  * called
 668  */
 669 void handle_percpu_devid_irq(unsigned int irq, struct irq_desc *desc)
 670 {
 671         struct irq_chip *chip = irq_desc_get_chip(desc);
 672         struct irqaction *action = desc->action;
 673         void *dev_id = __this_cpu_ptr(action->percpu_dev_id);
 674         irqreturn_t res;
 675
 676         kstat_incr_irqs_this_cpu(irq, desc);
 677
 678         if (chip->irq_ack)
 679                 chip->irq_ack(&desc->irq_data);
 680
 681         trace_irq_handler_entry(irq, action);
 682         res = action->handler(irq, dev_id);
 683         trace_irq_handler_exit(irq, action, res);
 684
 685         if (chip->irq_eoi)
 686                 chip->irq_eoi(&desc->irq_data);
 687 }
 688
 689 void
 690 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 691                   const char *name)
 692 {
 693         unsigned long flags;
 694         struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
 695
 696         if (!desc)
 697                 return;
 698
 699         if (!handle) {
 700                 handle = handle_bad_irq;
 701         } else {
 702                 if (WARN_ON(desc->irq_data.chip == &no_irq_chip))
 703                         goto out;
 704         }
 705
 706         /* Uninstall? */
 707         if (handle == handle_bad_irq) {
 708                 if (desc->irq_data.chip != &no_irq_chip)
 709                         mask_ack_irq(desc);
 710                 irq_state_set_disabled(desc);
 711                 desc->depth = 1;
 712         }
 713         desc->handle_irq = handle;
 714         desc->name = name;
 715
 716         if (handle != handle_bad_irq && is_chained) {
 717                 irq_settings_set_noprobe(desc);
 718                 irq_settings_set_norequest(desc);
 719                 irq_settings_set_nothread(desc);
 720                 irq_startup(desc, true);
 721         }
 722 out:
 723         irq_put_desc_busunlock(desc, flags);
 724 }
 725 EXPORT_SYMBOL_GPL(__irq_set_handler);
 726
 727 void
 728 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
 729                               irq_flow_handler_t handle, const char *name)
 730 {
 731         irq_set_chip(irq, chip);
 732         __irq_set_handler(irq, handle, 0, name);
 733 }
 734 EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name);
 735
 736 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
 737 {
 738         unsigned long flags;
 739         struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
 740
 741         if (!desc)
 742                 return;
 743         irq_settings_clr_and_set(desc, clr, set);
 744
 745         irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
 746                    IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
 747         if (irq_settings_has_no_balance_set(desc))
 748                 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
 749         if (irq_settings_is_per_cpu(desc))
 750                 irqd_set(&desc->irq_data, IRQD_PER_CPU);
 751         if (irq_settings_can_move_pcntxt(desc))
 752                 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
 753         if (irq_settings_is_level(desc))
 754                 irqd_set(&desc->irq_data, IRQD_LEVEL);
 755
 756         irqd_set(&desc->irq_data, irq_settings_get_trigger_mask(desc));
 757
 758         irq_put_desc_unlock(desc, flags);
 759 }
 760 EXPORT_SYMBOL_GPL(irq_modify_status);
 761
 762 /**
 763  *      irq_cpu_online - Invoke all irq_cpu_online functions.
 764  *
 765  *      Iterate through all irqs and invoke the chip.irq_cpu_online()
 766  *      for each.
 767  */
 768 void irq_cpu_online(void)
 769 {
 770         struct irq_desc *desc;
 771         struct irq_chip *chip;
 772         unsigned long flags;
 773         unsigned int irq;
 774
 775         for_each_active_irq(irq) {
 776                 desc = irq_to_desc(irq);
 777                 if (!desc)
 778                         continue;
 779
 780                 raw_spin_lock_irqsave(&desc->lock, flags);
 781
 782                 chip = irq_data_get_irq_chip(&desc->irq_data);
 783                 if (chip && chip->irq_cpu_online &&
 784                     (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
 785                      !irqd_irq_disabled(&desc->irq_data)))
 786                         chip->irq_cpu_online(&desc->irq_data);
 787
 788                 raw_spin_unlock_irqrestore(&desc->lock, flags);
 789         }
 790 }
 791
 792 /**
 793  *      irq_cpu_offline - Invoke all irq_cpu_offline functions.
 794  *
 795  *      Iterate through all irqs and invoke the chip.irq_cpu_offline()
 796  *      for each.
 797  */
 798 void irq_cpu_offline(void)
 799 {
 800         struct irq_desc *desc;
 801         struct irq_chip *chip;
 802         unsigned long flags;
 803         unsigned int irq;
 804
 805         for_each_active_irq(irq) {
 806                 desc = irq_to_desc(irq);
 807                 if (!desc)
 808                         continue;
 809
 810                 raw_spin_lock_irqsave(&desc->lock, flags);
 811
 812                 chip = irq_data_get_irq_chip(&desc->irq_data);
 813                 if (chip && chip->irq_cpu_offline &&
 814                     (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
 815                      !irqd_irq_disabled(&desc->irq_data)))
 816                         chip->irq_cpu_offline(&desc->irq_data);
 817
 818                 raw_spin_unlock_irqrestore(&desc->lock, flags);
 819         }
 820 }