kernel/irq/chip.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
bad_chained_irq
irq_set_chip
irq_set_irq_type
irq_set_handler_data
irq_set_msi_desc_off
irq_set_msi_desc
irq_set_chip_data
irq_get_irq_data
irq_state_clr_disabled
irq_state_clr_masked
irq_state_clr_started
irq_state_set_started
__irq_startup_managed
__irq_startup_managed
__irq_startup
irq_startup
irq_activate
irq_activate_and_startup
irq_shutdown
irq_shutdown_and_deactivate
irq_enable
__irq_disable
irq_disable
irq_percpu_enable
irq_percpu_disable
mask_ack_irq
mask_irq
unmask_irq
unmask_threaded_irq
handle_nested_irq
irq_check_poll
irq_may_run
handle_simple_irq
handle_untracked_irq
cond_unmask_irq
handle_level_irq
preflow_handler
preflow_handler
cond_unmask_eoi_irq
handle_fasteoi_irq
handle_fasteoi_nmi
handle_edge_irq
handle_edge_eoi_irq
handle_percpu_irq
handle_percpu_devid_irq
handle_percpu_devid_fasteoi_nmi
__irq_do_set_handler
__irq_set_handler
irq_set_chained_handler_and_data
irq_set_chip_and_handler_name
irq_modify_status
irq_cpu_online
irq_cpu_offline
handle_fasteoi_ack_irq
handle_fasteoi_mask_irq
irq_chip_enable_parent
irq_chip_disable_parent
irq_chip_ack_parent
irq_chip_mask_parent
irq_chip_mask_ack_parent
irq_chip_unmask_parent
irq_chip_eoi_parent
irq_chip_set_affinity_parent
irq_chip_set_type_parent
irq_chip_retrigger_hierarchy
irq_chip_set_vcpu_affinity_parent
irq_chip_set_wake_parent
irq_chip_request_resources_parent
irq_chip_release_resources_parent
irq_chip_compose_msi_msg
irq_chip_pm_get
irq_chip_pm_put
   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
   4  * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
   5  *
   6  * This file contains the core interrupt handling code, for irq-chip based
   7  * architectures. Detailed information is available in
   8  * Documentation/core-api/genericirq.rst
   9  */
  10 
  11 #include <linux/irq.h>
  12 #include <linux/msi.h>
  13 #include <linux/module.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/kernel_stat.h>
  16 #include <linux/irqdomain.h>
  17 
  18 #include <trace/events/irq.h>
  19 
  20 #include "internals.h"
  21 
  22 static irqreturn_t bad_chained_irq(int irq, void *dev_id)
  23 {
  24         WARN_ONCE(1, "Chained irq %d should not call an action\n", irq);
  25         return IRQ_NONE;
  26 }
  27 
  28 /*
  29  * Chained handlers should never call action on their IRQ. This default
  30  * action will emit warning if such thing happens.
  31  */
  32 struct irqaction chained_action = {
  33         .handler = bad_chained_irq,
  34 };
  35 
  36 /**
  37  *      irq_set_chip - set the irq chip for an irq
  38  *      @irq:   irq number
  39  *      @chip:  pointer to irq chip description structure
  40  */
  41 int irq_set_chip(unsigned int irq, struct irq_chip *chip)
  42 {
  43         unsigned long flags;
  44         struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
  45 
  46         if (!desc)
  47                 return -EINVAL;
  48 
  49         if (!chip)
  50                 chip = &no_irq_chip;
  51 
  52         desc->irq_data.chip = chip;
  53         irq_put_desc_unlock(desc, flags);
  54         /*
  55          * For !CONFIG_SPARSE_IRQ make the irq show up in
  56          * allocated_irqs.
  57          */
  58         irq_mark_irq(irq);
  59         return 0;
  60 }
  61 EXPORT_SYMBOL(irq_set_chip);
  62 
  63 /**
  64  *      irq_set_type - set the irq trigger type for an irq
  65  *      @irq:   irq number
  66  *      @type:  IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
  67  */
  68 int irq_set_irq_type(unsigned int irq, unsigned int type)
  69 {
  70         unsigned long flags;
  71         struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
  72         int ret = 0;
  73 
  74         if (!desc)
  75                 return -EINVAL;
  76 
  77         ret = __irq_set_trigger(desc, type);
  78         irq_put_desc_busunlock(desc, flags);
  79         return ret;
  80 }
  81 EXPORT_SYMBOL(irq_set_irq_type);
  82 
  83 /**
  84  *      irq_set_handler_data - set irq handler data for an irq
  85  *      @irq:   Interrupt number
  86  *      @data:  Pointer to interrupt specific data
  87  *
  88  *      Set the hardware irq controller data for an irq
  89  */
  90 int irq_set_handler_data(unsigned int irq, void *data)
  91 {
  92         unsigned long flags;
  93         struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
  94 
  95         if (!desc)
  96                 return -EINVAL;
  97         desc->irq_common_data.handler_data = data;
  98         irq_put_desc_unlock(desc, flags);
  99         return 0;
 100 }
 101 EXPORT_SYMBOL(irq_set_handler_data);
 102 
 103 /**
 104  *      irq_set_msi_desc_off - set MSI descriptor data for an irq at offset
 105  *      @irq_base:      Interrupt number base
 106  *      @irq_offset:    Interrupt number offset
 107  *      @entry:         Pointer to MSI descriptor data
 108  *
 109  *      Set the MSI descriptor entry for an irq at offset
 110  */
 111 int irq_set_msi_desc_off(unsigned int irq_base, unsigned int irq_offset,
 112                          struct msi_desc *entry)
 113 {
 114         unsigned long flags;
 115         struct irq_desc *desc = irq_get_desc_lock(irq_base + irq_offset, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
 116 
 117         if (!desc)
 118                 return -EINVAL;
 119         desc->irq_common_data.msi_desc = entry;
 120         if (entry && !irq_offset)
 121                 entry->irq = irq_base;
 122         irq_put_desc_unlock(desc, flags);
 123         return 0;
 124 }
 125 
 126 /**
 127  *      irq_set_msi_desc - set MSI descriptor data for an irq
 128  *      @irq:   Interrupt number
 129  *      @entry: Pointer to MSI descriptor data
 130  *
 131  *      Set the MSI descriptor entry for an irq
 132  */
 133 int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
 134 {
 135         return irq_set_msi_desc_off(irq, 0, entry);
 136 }
 137 
 138 /**
 139  *      irq_set_chip_data - set irq chip data for an irq
 140  *      @irq:   Interrupt number
 141  *      @data:  Pointer to chip specific data
 142  *
 143  *      Set the hardware irq chip data for an irq
 144  */
 145 int irq_set_chip_data(unsigned int irq, void *data)
 146 {
 147         unsigned long flags;
 148         struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
 149 
 150         if (!desc)
 151                 return -EINVAL;
 152         desc->irq_data.chip_data = data;
 153         irq_put_desc_unlock(desc, flags);
 154         return 0;
 155 }
 156 EXPORT_SYMBOL(irq_set_chip_data);
 157 
 158 struct irq_data *irq_get_irq_data(unsigned int irq)
 159 {
 160         struct irq_desc *desc = irq_to_desc(irq);
 161 
 162         return desc ? &desc->irq_data : NULL;
 163 }
 164 EXPORT_SYMBOL_GPL(irq_get_irq_data);
 165 
 166 static void irq_state_clr_disabled(struct irq_desc *desc)
 167 {
 168         irqd_clear(&desc->irq_data, IRQD_IRQ_DISABLED);
 169 }
 170 
 171 static void irq_state_clr_masked(struct irq_desc *desc)
 172 {
 173         irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED);
 174 }
 175 
 176 static void irq_state_clr_started(struct irq_desc *desc)
 177 {
 178         irqd_clear(&desc->irq_data, IRQD_IRQ_STARTED);
 179 }
 180 
 181 static void irq_state_set_started(struct irq_desc *desc)
 182 {
 183         irqd_set(&desc->irq_data, IRQD_IRQ_STARTED);
 184 }
 185 
 186 enum {
 187         IRQ_STARTUP_NORMAL,
 188         IRQ_STARTUP_MANAGED,
 189         IRQ_STARTUP_ABORT,
 190 };
 191 
 192 #ifdef CONFIG_SMP
 193 static int
 194 __irq_startup_managed(struct irq_desc *desc, struct cpumask *aff, bool force)
 195 {
 196         struct irq_data *d = irq_desc_get_irq_data(desc);
 197 
 198         if (!irqd_affinity_is_managed(d))
 199                 return IRQ_STARTUP_NORMAL;
 200 
 201         irqd_clr_managed_shutdown(d);
 202 
 203         if (cpumask_any_and(aff, cpu_online_mask) >= nr_cpu_ids) {
 204                 /*
 205                  * Catch code which fiddles with enable_irq() on a managed
 206                  * and potentially shutdown IRQ. Chained interrupt
 207                  * installment or irq auto probing should not happen on
 208                  * managed irqs either.
 209                  */
 210                 if (WARN_ON_ONCE(force))
 211                         return IRQ_STARTUP_ABORT;
 212                 /*
 213                  * The interrupt was requested, but there is no online CPU
 214                  * in it's affinity mask. Put it into managed shutdown
 215                  * state and let the cpu hotplug mechanism start it up once
 216                  * a CPU in the mask becomes available.
 217                  */
 218                 return IRQ_STARTUP_ABORT;
 219         }
 220         /*
 221          * Managed interrupts have reserved resources, so this should not
 222          * happen.
 223          */
 224         if (WARN_ON(irq_domain_activate_irq(d, false)))
 225                 return IRQ_STARTUP_ABORT;
 226         return IRQ_STARTUP_MANAGED;
 227 }
 228 #else
 229 static __always_inline int
 230 __irq_startup_managed(struct irq_desc *desc, struct cpumask *aff, bool force)
 231 {
 232         return IRQ_STARTUP_NORMAL;
 233 }
 234 #endif
 235 
 236 static int __irq_startup(struct irq_desc *desc)
 237 {
 238         struct irq_data *d = irq_desc_get_irq_data(desc);
 239         int ret = 0;
 240 
 241         /* Warn if this interrupt is not activated but try nevertheless */
 242         WARN_ON_ONCE(!irqd_is_activated(d));
 243 
 244         if (d->chip->irq_startup) {
 245                 ret = d->chip->irq_startup(d);
 246                 irq_state_clr_disabled(desc);
 247                 irq_state_clr_masked(desc);
 248         } else {
 249                 irq_enable(desc);
 250         }
 251         irq_state_set_started(desc);
 252         return ret;
 253 }
 254 
 255 int irq_startup(struct irq_desc *desc, bool resend, bool force)
 256 {
 257         struct irq_data *d = irq_desc_get_irq_data(desc);
 258         struct cpumask *aff = irq_data_get_affinity_mask(d);
 259         int ret = 0;
 260 
 261         desc->depth = 0;
 262 
 263         if (irqd_is_started(d)) {
 264                 irq_enable(desc);
 265         } else {
 266                 switch (__irq_startup_managed(desc, aff, force)) {
 267                 case IRQ_STARTUP_NORMAL:
 268                         ret = __irq_startup(desc);
 269                         irq_setup_affinity(desc);
 270                         break;
 271                 case IRQ_STARTUP_MANAGED:
 272                         irq_do_set_affinity(d, aff, false);
 273                         ret = __irq_startup(desc);
 274                         break;
 275                 case IRQ_STARTUP_ABORT:
 276                         irqd_set_managed_shutdown(d);
 277                         return 0;
 278                 }
 279         }
 280         if (resend)
 281                 check_irq_resend(desc);
 282 
 283         return ret;
 284 }
 285 
 286 int irq_activate(struct irq_desc *desc)
 287 {
 288         struct irq_data *d = irq_desc_get_irq_data(desc);
 289 
 290         if (!irqd_affinity_is_managed(d))
 291                 return irq_domain_activate_irq(d, false);
 292         return 0;
 293 }
 294 
 295 int irq_activate_and_startup(struct irq_desc *desc, bool resend)
 296 {
 297         if (WARN_ON(irq_activate(desc)))
 298                 return 0;
 299         return irq_startup(desc, resend, IRQ_START_FORCE);
 300 }
 301 
 302 static void __irq_disable(struct irq_desc *desc, bool mask);
 303 
 304 void irq_shutdown(struct irq_desc *desc)
 305 {
 306         if (irqd_is_started(&desc->irq_data)) {
 307                 desc->depth = 1;
 308                 if (desc->irq_data.chip->irq_shutdown) {
 309                         desc->irq_data.chip->irq_shutdown(&desc->irq_data);
 310                         irq_state_set_disabled(desc);
 311                         irq_state_set_masked(desc);
 312                 } else {
 313                         __irq_disable(desc, true);
 314                 }
 315                 irq_state_clr_started(desc);
 316         }
 317 }
 318 
 319 
 320 void irq_shutdown_and_deactivate(struct irq_desc *desc)
 321 {
 322         irq_shutdown(desc);
 323         /*
 324          * This must be called even if the interrupt was never started up,
 325          * because the activation can happen before the interrupt is
 326          * available for request/startup. It has it's own state tracking so
 327          * it's safe to call it unconditionally.
 328          */
 329         irq_domain_deactivate_irq(&desc->irq_data);
 330 }
 331 
 332 void irq_enable(struct irq_desc *desc)
 333 {
 334         if (!irqd_irq_disabled(&desc->irq_data)) {
 335                 unmask_irq(desc);
 336         } else {
 337                 irq_state_clr_disabled(desc);
 338                 if (desc->irq_data.chip->irq_enable) {
 339                         desc->irq_data.chip->irq_enable(&desc->irq_data);
 340                         irq_state_clr_masked(desc);
 341                 } else {
 342                         unmask_irq(desc);
 343                 }
 344         }
 345 }
 346 
 347 static void __irq_disable(struct irq_desc *desc, bool mask)
 348 {
 349         if (irqd_irq_disabled(&desc->irq_data)) {
 350                 if (mask)
 351                         mask_irq(desc);
 352         } else {
 353                 irq_state_set_disabled(desc);
 354                 if (desc->irq_data.chip->irq_disable) {
 355                         desc->irq_data.chip->irq_disable(&desc->irq_data);
 356                         irq_state_set_masked(desc);
 357                 } else if (mask) {
 358                         mask_irq(desc);
 359                 }
 360         }
 361 }
 362 
 363 /**
 364  * irq_disable - Mark interrupt disabled
 365  * @desc:       irq descriptor which should be disabled
 366  *
 367  * If the chip does not implement the irq_disable callback, we
 368  * use a lazy disable approach. That means we mark the interrupt
 369  * disabled, but leave the hardware unmasked. That's an
 370  * optimization because we avoid the hardware access for the
 371  * common case where no interrupt happens after we marked it
 372  * disabled. If an interrupt happens, then the interrupt flow
 373  * handler masks the line at the hardware level and marks it
 374  * pending.
 375  *
 376  * If the interrupt chip does not implement the irq_disable callback,
 377  * a driver can disable the lazy approach for a particular irq line by
 378  * calling 'irq_set_status_flags(irq, IRQ_DISABLE_UNLAZY)'. This can
 379  * be used for devices which cannot disable the interrupt at the
 380  * device level under certain circumstances and have to use
 381  * disable_irq[_nosync] instead.
 382  */
 383 void irq_disable(struct irq_desc *desc)
 384 {
 385         __irq_disable(desc, irq_settings_disable_unlazy(desc));
 386 }
 387 
 388 void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu)
 389 {
 390         if (desc->irq_data.chip->irq_enable)
 391                 desc->irq_data.chip->irq_enable(&desc->irq_data);
 392         else
 393                 desc->irq_data.chip->irq_unmask(&desc->irq_data);
 394         cpumask_set_cpu(cpu, desc->percpu_enabled);
 395 }
 396 
 397 void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu)
 398 {
 399         if (desc->irq_data.chip->irq_disable)
 400                 desc->irq_data.chip->irq_disable(&desc->irq_data);
 401         else
 402                 desc->irq_data.chip->irq_mask(&desc->irq_data);
 403         cpumask_clear_cpu(cpu, desc->percpu_enabled);
 404 }
 405 
 406 static inline void mask_ack_irq(struct irq_desc *desc)
 407 {
 408         if (desc->irq_data.chip->irq_mask_ack) {
 409                 desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
 410                 irq_state_set_masked(desc);
 411         } else {
 412                 mask_irq(desc);
 413                 if (desc->irq_data.chip->irq_ack)
 414                         desc->irq_data.chip->irq_ack(&desc->irq_data);
 415         }
 416 }
 417 
 418 void mask_irq(struct irq_desc *desc)
 419 {
 420         if (irqd_irq_masked(&desc->irq_data))
 421                 return;
 422 
 423         if (desc->irq_data.chip->irq_mask) {
 424                 desc->irq_data.chip->irq_mask(&desc->irq_data);
 425                 irq_state_set_masked(desc);
 426         }
 427 }
 428 
 429 void unmask_irq(struct irq_desc *desc)
 430 {
 431         if (!irqd_irq_masked(&desc->irq_data))
 432                 return;
 433 
 434         if (desc->irq_data.chip->irq_unmask) {
 435                 desc->irq_data.chip->irq_unmask(&desc->irq_data);
 436                 irq_state_clr_masked(desc);
 437         }
 438 }
 439 
 440 void unmask_threaded_irq(struct irq_desc *desc)
 441 {
 442         struct irq_chip *chip = desc->irq_data.chip;
 443 
 444         if (chip->flags & IRQCHIP_EOI_THREADED)
 445                 chip->irq_eoi(&desc->irq_data);
 446 
 447         unmask_irq(desc);
 448 }
 449 
 450 /*
 451  *      handle_nested_irq - Handle a nested irq from a irq thread
 452  *      @irq:   the interrupt number
 453  *
 454  *      Handle interrupts which are nested into a threaded interrupt
 455  *      handler. The handler function is called inside the calling
 456  *      threads context.
 457  */
 458 void handle_nested_irq(unsigned int irq)
 459 {
 460         struct irq_desc *desc = irq_to_desc(irq);
 461         struct irqaction *action;
 462         irqreturn_t action_ret;
 463 
 464         might_sleep();
 465 
 466         raw_spin_lock_irq(&desc->lock);
 467 
 468         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 469 
 470         action = desc->action;
 471         if (unlikely(!action || irqd_irq_disabled(&desc->irq_data))) {
 472                 desc->istate |= IRQS_PENDING;
 473                 goto out_unlock;
 474         }
 475 
 476         kstat_incr_irqs_this_cpu(desc);
 477         irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
 478         raw_spin_unlock_irq(&desc->lock);
 479 
 480         action_ret = IRQ_NONE;
 481         for_each_action_of_desc(desc, action)
 482                 action_ret |= action->thread_fn(action->irq, action->dev_id);
 483 
 484         if (!noirqdebug)
 485                 note_interrupt(desc, action_ret);
 486 
 487         raw_spin_lock_irq(&desc->lock);
 488         irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
 489 
 490 out_unlock:
 491         raw_spin_unlock_irq(&desc->lock);
 492 }
 493 EXPORT_SYMBOL_GPL(handle_nested_irq);
 494 
 495 static bool irq_check_poll(struct irq_desc *desc)
 496 {
 497         if (!(desc->istate & IRQS_POLL_INPROGRESS))
 498                 return false;
 499         return irq_wait_for_poll(desc);
 500 }
 501 
 502 static bool irq_may_run(struct irq_desc *desc)
 503 {
 504         unsigned int mask = IRQD_IRQ_INPROGRESS | IRQD_WAKEUP_ARMED;
 505 
 506         /*
 507          * If the interrupt is not in progress and is not an armed
 508          * wakeup interrupt, proceed.
 509          */
 510         if (!irqd_has_set(&desc->irq_data, mask))
 511                 return true;
 512 
 513         /*
 514          * If the interrupt is an armed wakeup source, mark it pending
 515          * and suspended, disable it and notify the pm core about the
 516          * event.
 517          */
 518         if (irq_pm_check_wakeup(desc))
 519                 return false;
 520 
 521         /*
 522          * Handle a potential concurrent poll on a different core.
 523          */
 524         return irq_check_poll(desc);
 525 }
 526 
 527 /**
 528  *      handle_simple_irq - Simple and software-decoded IRQs.
 529  *      @desc:  the interrupt description structure for this irq
 530  *
 531  *      Simple interrupts are either sent from a demultiplexing interrupt
 532  *      handler or come from hardware, where no interrupt hardware control
 533  *      is necessary.
 534  *
 535  *      Note: The caller is expected to handle the ack, clear, mask and
 536  *      unmask issues if necessary.
 537  */
 538 void handle_simple_irq(struct irq_desc *desc)
 539 {
 540         raw_spin_lock(&desc->lock);
 541 
 542         if (!irq_may_run(desc))
 543                 goto out_unlock;
 544 
 545         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 546 
 547         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
 548                 desc->istate |= IRQS_PENDING;
 549                 goto out_unlock;
 550         }
 551 
 552         kstat_incr_irqs_this_cpu(desc);
 553         handle_irq_event(desc);
 554 
 555 out_unlock:
 556         raw_spin_unlock(&desc->lock);
 557 }
 558 EXPORT_SYMBOL_GPL(handle_simple_irq);
 559 
 560 /**
 561  *      handle_untracked_irq - Simple and software-decoded IRQs.
 562  *      @desc:  the interrupt description structure for this irq
 563  *
 564  *      Untracked interrupts are sent from a demultiplexing interrupt
 565  *      handler when the demultiplexer does not know which device it its
 566  *      multiplexed irq domain generated the interrupt. IRQ's handled
 567  *      through here are not subjected to stats tracking, randomness, or
 568  *      spurious interrupt detection.
 569  *
 570  *      Note: Like handle_simple_irq, the caller is expected to handle
 571  *      the ack, clear, mask and unmask issues if necessary.
 572  */
 573 void handle_untracked_irq(struct irq_desc *desc)
 574 {
 575         unsigned int flags = 0;
 576 
 577         raw_spin_lock(&desc->lock);
 578 
 579         if (!irq_may_run(desc))
 580                 goto out_unlock;
 581 
 582         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 583 
 584         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
 585                 desc->istate |= IRQS_PENDING;
 586                 goto out_unlock;
 587         }
 588 
 589         desc->istate &= ~IRQS_PENDING;
 590         irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
 591         raw_spin_unlock(&desc->lock);
 592 
 593         __handle_irq_event_percpu(desc, &flags);
 594 
 595         raw_spin_lock(&desc->lock);
 596         irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
 597 
 598 out_unlock:
 599         raw_spin_unlock(&desc->lock);
 600 }
 601 EXPORT_SYMBOL_GPL(handle_untracked_irq);
 602 
 603 /*
 604  * Called unconditionally from handle_level_irq() and only for oneshot
 605  * interrupts from handle_fasteoi_irq()
 606  */
 607 static void cond_unmask_irq(struct irq_desc *desc)
 608 {
 609         /*
 610          * We need to unmask in the following cases:
 611          * - Standard level irq (IRQF_ONESHOT is not set)
 612          * - Oneshot irq which did not wake the thread (caused by a
 613          *   spurious interrupt or a primary handler handling it
 614          *   completely).
 615          */
 616         if (!irqd_irq_disabled(&desc->irq_data) &&
 617             irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot)
 618                 unmask_irq(desc);
 619 }
 620 
 621 /**
 622  *      handle_level_irq - Level type irq handler
 623  *      @desc:  the interrupt description structure for this irq
 624  *
 625  *      Level type interrupts are active as long as the hardware line has
 626  *      the active level. This may require to mask the interrupt and unmask
 627  *      it after the associated handler has acknowledged the device, so the
 628  *      interrupt line is back to inactive.
 629  */
 630 void handle_level_irq(struct irq_desc *desc)
 631 {
 632         raw_spin_lock(&desc->lock);
 633         mask_ack_irq(desc);
 634 
 635         if (!irq_may_run(desc))
 636                 goto out_unlock;
 637 
 638         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 639 
 640         /*
 641          * If its disabled or no action available
 642          * keep it masked and get out of here
 643          */
 644         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
 645                 desc->istate |= IRQS_PENDING;
 646                 goto out_unlock;
 647         }
 648 
 649         kstat_incr_irqs_this_cpu(desc);
 650         handle_irq_event(desc);
 651 
 652         cond_unmask_irq(desc);
 653 
 654 out_unlock:
 655         raw_spin_unlock(&desc->lock);
 656 }
 657 EXPORT_SYMBOL_GPL(handle_level_irq);
 658 
 659 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 660 static inline void preflow_handler(struct irq_desc *desc)
 661 {
 662         if (desc->preflow_handler)
 663                 desc->preflow_handler(&desc->irq_data);
 664 }
 665 #else
 666 static inline void preflow_handler(struct irq_desc *desc) { }
 667 #endif
 668 
 669 static void cond_unmask_eoi_irq(struct irq_desc *desc, struct irq_chip *chip)
 670 {
 671         if (!(desc->istate & IRQS_ONESHOT)) {
 672                 chip->irq_eoi(&desc->irq_data);
 673                 return;
 674         }
 675         /*
 676          * We need to unmask in the following cases:
 677          * - Oneshot irq which did not wake the thread (caused by a
 678          *   spurious interrupt or a primary handler handling it
 679          *   completely).
 680          */
 681         if (!irqd_irq_disabled(&desc->irq_data) &&
 682             irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot) {
 683                 chip->irq_eoi(&desc->irq_data);
 684                 unmask_irq(desc);
 685         } else if (!(chip->flags & IRQCHIP_EOI_THREADED)) {
 686                 chip->irq_eoi(&desc->irq_data);
 687         }
 688 }
 689 
 690 /**
 691  *      handle_fasteoi_irq - irq handler for transparent controllers
 692  *      @desc:  the interrupt description structure for this irq
 693  *
 694  *      Only a single callback will be issued to the chip: an ->eoi()
 695  *      call when the interrupt has been serviced. This enables support
 696  *      for modern forms of interrupt handlers, which handle the flow
 697  *      details in hardware, transparently.
 698  */
 699 void handle_fasteoi_irq(struct irq_desc *desc)
 700 {
 701         struct irq_chip *chip = desc->irq_data.chip;
 702 
 703         raw_spin_lock(&desc->lock);
 704 
 705         if (!irq_may_run(desc))
 706                 goto out;
 707 
 708         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 709 
 710         /*
 711          * If its disabled or no action available
 712          * then mask it and get out of here:
 713          */
 714         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
 715                 desc->istate |= IRQS_PENDING;
 716                 mask_irq(desc);
 717                 goto out;
 718         }
 719 
 720         kstat_incr_irqs_this_cpu(desc);
 721         if (desc->istate & IRQS_ONESHOT)
 722                 mask_irq(desc);
 723 
 724         preflow_handler(desc);
 725         handle_irq_event(desc);
 726 
 727         cond_unmask_eoi_irq(desc, chip);
 728 
 729         raw_spin_unlock(&desc->lock);
 730         return;
 731 out:
 732         if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
 733                 chip->irq_eoi(&desc->irq_data);
 734         raw_spin_unlock(&desc->lock);
 735 }
 736 EXPORT_SYMBOL_GPL(handle_fasteoi_irq);
 737 
 738 /**
 739  *      handle_fasteoi_nmi - irq handler for NMI interrupt lines
 740  *      @desc:  the interrupt description structure for this irq
 741  *
 742  *      A simple NMI-safe handler, considering the restrictions
 743  *      from request_nmi.
 744  *
 745  *      Only a single callback will be issued to the chip: an ->eoi()
 746  *      call when the interrupt has been serviced. This enables support
 747  *      for modern forms of interrupt handlers, which handle the flow
 748  *      details in hardware, transparently.
 749  */
 750 void handle_fasteoi_nmi(struct irq_desc *desc)
 751 {
 752         struct irq_chip *chip = irq_desc_get_chip(desc);
 753         struct irqaction *action = desc->action;
 754         unsigned int irq = irq_desc_get_irq(desc);
 755         irqreturn_t res;
 756 
 757         __kstat_incr_irqs_this_cpu(desc);
 758 
 759         trace_irq_handler_entry(irq, action);
 760         /*
 761          * NMIs cannot be shared, there is only one action.
 762          */
 763         res = action->handler(irq, action->dev_id);
 764         trace_irq_handler_exit(irq, action, res);
 765 
 766         if (chip->irq_eoi)
 767                 chip->irq_eoi(&desc->irq_data);
 768 }
 769 EXPORT_SYMBOL_GPL(handle_fasteoi_nmi);
 770 
 771 /**
 772  *      handle_edge_irq - edge type IRQ handler
 773  *      @desc:  the interrupt description structure for this irq
 774  *
 775  *      Interrupt occures on the falling and/or rising edge of a hardware
 776  *      signal. The occurrence is latched into the irq controller hardware
 777  *      and must be acked in order to be reenabled. After the ack another
 778  *      interrupt can happen on the same source even before the first one
 779  *      is handled by the associated event handler. If this happens it
 780  *      might be necessary to disable (mask) the interrupt depending on the
 781  *      controller hardware. This requires to reenable the interrupt inside
 782  *      of the loop which handles the interrupts which have arrived while
 783  *      the handler was running. If all pending interrupts are handled, the
 784  *      loop is left.
 785  */
 786 void handle_edge_irq(struct irq_desc *desc)
 787 {
 788         raw_spin_lock(&desc->lock);
 789 
 790         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 791 
 792         if (!irq_may_run(desc)) {
 793                 desc->istate |= IRQS_PENDING;
 794                 mask_ack_irq(desc);
 795                 goto out_unlock;
 796         }
 797 
 798         /*
 799          * If its disabled or no action available then mask it and get
 800          * out of here.
 801          */
 802         if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
 803                 desc->istate |= IRQS_PENDING;
 804                 mask_ack_irq(desc);
 805                 goto out_unlock;
 806         }
 807 
 808         kstat_incr_irqs_this_cpu(desc);
 809 
 810         /* Start handling the irq */
 811         desc->irq_data.chip->irq_ack(&desc->irq_data);
 812 
 813         do {
 814                 if (unlikely(!desc->action)) {
 815                         mask_irq(desc);
 816                         goto out_unlock;
 817                 }
 818 
 819                 /*
 820                  * When another irq arrived while we were handling
 821                  * one, we could have masked the irq.
 822                  * Renable it, if it was not disabled in meantime.
 823                  */
 824                 if (unlikely(desc->istate & IRQS_PENDING)) {
 825                         if (!irqd_irq_disabled(&desc->irq_data) &&
 826                             irqd_irq_masked(&desc->irq_data))
 827                                 unmask_irq(desc);
 828                 }
 829 
 830                 handle_irq_event(desc);
 831 
 832         } while ((desc->istate & IRQS_PENDING) &&
 833                  !irqd_irq_disabled(&desc->irq_data));
 834 
 835 out_unlock:
 836         raw_spin_unlock(&desc->lock);
 837 }
 838 EXPORT_SYMBOL(handle_edge_irq);
 839 
 840 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
 841 /**
 842  *      handle_edge_eoi_irq - edge eoi type IRQ handler
 843  *      @desc:  the interrupt description structure for this irq
 844  *
 845  * Similar as the above handle_edge_irq, but using eoi and w/o the
 846  * mask/unmask logic.
 847  */
 848 void handle_edge_eoi_irq(struct irq_desc *desc)
 849 {
 850         struct irq_chip *chip = irq_desc_get_chip(desc);
 851 
 852         raw_spin_lock(&desc->lock);
 853 
 854         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 855 
 856         if (!irq_may_run(desc)) {
 857                 desc->istate |= IRQS_PENDING;
 858                 goto out_eoi;
 859         }
 860 
 861         /*
 862          * If its disabled or no action available then mask it and get
 863          * out of here.
 864          */
 865         if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
 866                 desc->istate |= IRQS_PENDING;
 867                 goto out_eoi;
 868         }
 869 
 870         kstat_incr_irqs_this_cpu(desc);
 871 
 872         do {
 873                 if (unlikely(!desc->action))
 874                         goto out_eoi;
 875 
 876                 handle_irq_event(desc);
 877 
 878         } while ((desc->istate & IRQS_PENDING) &&
 879                  !irqd_irq_disabled(&desc->irq_data));
 880 
 881 out_eoi:
 882         chip->irq_eoi(&desc->irq_data);
 883         raw_spin_unlock(&desc->lock);
 884 }
 885 #endif
 886 
 887 /**
 888  *      handle_percpu_irq - Per CPU local irq handler
 889  *      @desc:  the interrupt description structure for this irq
 890  *
 891  *      Per CPU interrupts on SMP machines without locking requirements
 892  */
 893 void handle_percpu_irq(struct irq_desc *desc)
 894 {
 895         struct irq_chip *chip = irq_desc_get_chip(desc);
 896 
 897         /*
 898          * PER CPU interrupts are not serialized. Do not touch
 899          * desc->tot_count.
 900          */
 901         __kstat_incr_irqs_this_cpu(desc);
 902 
 903         if (chip->irq_ack)
 904                 chip->irq_ack(&desc->irq_data);
 905 
 906         handle_irq_event_percpu(desc);
 907 
 908         if (chip->irq_eoi)
 909                 chip->irq_eoi(&desc->irq_data);
 910 }
 911 
 912 /**
 913  * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
 914  * @desc:       the interrupt description structure for this irq
 915  *
 916  * Per CPU interrupts on SMP machines without locking requirements. Same as
 917  * handle_percpu_irq() above but with the following extras:
 918  *
 919  * action->percpu_dev_id is a pointer to percpu variables which
 920  * contain the real device id for the cpu on which this handler is
 921  * called
 922  */
 923 void handle_percpu_devid_irq(struct irq_desc *desc)
 924 {
 925         struct irq_chip *chip = irq_desc_get_chip(desc);
 926         struct irqaction *action = desc->action;
 927         unsigned int irq = irq_desc_get_irq(desc);
 928         irqreturn_t res;
 929 
 930         /*
 931          * PER CPU interrupts are not serialized. Do not touch
 932          * desc->tot_count.
 933          */
 934         __kstat_incr_irqs_this_cpu(desc);
 935 
 936         if (chip->irq_ack)
 937                 chip->irq_ack(&desc->irq_data);
 938 
 939         if (likely(action)) {
 940                 trace_irq_handler_entry(irq, action);
 941                 res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
 942                 trace_irq_handler_exit(irq, action, res);
 943         } else {
 944                 unsigned int cpu = smp_processor_id();
 945                 bool enabled = cpumask_test_cpu(cpu, desc->percpu_enabled);
 946 
 947                 if (enabled)
 948                         irq_percpu_disable(desc, cpu);
 949 
 950                 pr_err_once("Spurious%s percpu IRQ%u on CPU%u\n",
 951                             enabled ? " and unmasked" : "", irq, cpu);
 952         }
 953 
 954         if (chip->irq_eoi)
 955                 chip->irq_eoi(&desc->irq_data);
 956 }
 957 
 958 /**
 959  * handle_percpu_devid_fasteoi_nmi - Per CPU local NMI handler with per cpu
 960  *                                   dev ids
 961  * @desc:       the interrupt description structure for this irq
 962  *
 963  * Similar to handle_fasteoi_nmi, but handling the dev_id cookie
 964  * as a percpu pointer.
 965  */
 966 void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc)
 967 {
 968         struct irq_chip *chip = irq_desc_get_chip(desc);
 969         struct irqaction *action = desc->action;
 970         unsigned int irq = irq_desc_get_irq(desc);
 971         irqreturn_t res;
 972 
 973         __kstat_incr_irqs_this_cpu(desc);
 974 
 975         trace_irq_handler_entry(irq, action);
 976         res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
 977         trace_irq_handler_exit(irq, action, res);
 978 
 979         if (chip->irq_eoi)
 980                 chip->irq_eoi(&desc->irq_data);
 981 }
 982 
 983 static void
 984 __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
 985                      int is_chained, const char *name)
 986 {
 987         if (!handle) {
 988                 handle = handle_bad_irq;
 989         } else {
 990                 struct irq_data *irq_data = &desc->irq_data;
 991 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
 992                 /*
 993                  * With hierarchical domains we might run into a
 994                  * situation where the outermost chip is not yet set
 995                  * up, but the inner chips are there.  Instead of
 996                  * bailing we install the handler, but obviously we
 997                  * cannot enable/startup the interrupt at this point.
 998                  */
 999                 while (irq_data) {
1000                         if (irq_data->chip != &no_irq_chip)
1001                                 break;
1002                         /*
1003                          * Bail out if the outer chip is not set up
1004                          * and the interrupt supposed to be started
1005                          * right away.
1006                          */
1007                         if (WARN_ON(is_chained))
1008                                 return;
1009                         /* Try the parent */
1010                         irq_data = irq_data->parent_data;
1011                 }
1012 #endif
1013                 if (WARN_ON(!irq_data || irq_data->chip == &no_irq_chip))
1014                         return;
1015         }
1016 
1017         /* Uninstall? */
1018         if (handle == handle_bad_irq) {
1019                 if (desc->irq_data.chip != &no_irq_chip)
1020                         mask_ack_irq(desc);
1021                 irq_state_set_disabled(desc);
1022                 if (is_chained)
1023                         desc->action = NULL;
1024                 desc->depth = 1;
1025         }
1026         desc->handle_irq = handle;
1027         desc->name = name;
1028 
1029         if (handle != handle_bad_irq && is_chained) {
1030                 unsigned int type = irqd_get_trigger_type(&desc->irq_data);
1031 
1032                 /*
1033                  * We're about to start this interrupt immediately,
1034                  * hence the need to set the trigger configuration.
1035                  * But the .set_type callback may have overridden the
1036                  * flow handler, ignoring that we're dealing with a
1037                  * chained interrupt. Reset it immediately because we
1038                  * do know better.
1039                  */
1040                 if (type != IRQ_TYPE_NONE) {
1041                         __irq_set_trigger(desc, type);
1042                         desc->handle_irq = handle;
1043                 }
1044 
1045                 irq_settings_set_noprobe(desc);
1046                 irq_settings_set_norequest(desc);
1047                 irq_settings_set_nothread(desc);
1048                 desc->action = &chained_action;
1049                 irq_activate_and_startup(desc, IRQ_RESEND);
1050         }
1051 }
1052 
1053 void
1054 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
1055                   const char *name)
1056 {
1057         unsigned long flags;
1058         struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1059 
1060         if (!desc)
1061                 return;
1062 
1063         __irq_do_set_handler(desc, handle, is_chained, name);
1064         irq_put_desc_busunlock(desc, flags);
1065 }
1066 EXPORT_SYMBOL_GPL(__irq_set_handler);
1067 
1068 void
1069 irq_set_chained_handler_and_data(unsigned int irq, irq_flow_handler_t handle,
1070                                  void *data)
1071 {
1072         unsigned long flags;
1073         struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1074 
1075         if (!desc)
1076                 return;
1077 
1078         desc->irq_common_data.handler_data = data;
1079         __irq_do_set_handler(desc, handle, 1, NULL);
1080 
1081         irq_put_desc_busunlock(desc, flags);
1082 }
1083 EXPORT_SYMBOL_GPL(irq_set_chained_handler_and_data);
1084 
1085 void
1086 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
1087                               irq_flow_handler_t handle, const char *name)
1088 {
1089         irq_set_chip(irq, chip);
1090         __irq_set_handler(irq, handle, 0, name);
1091 }
1092 EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name);
1093 
1094 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
1095 {
1096         unsigned long flags, trigger, tmp;
1097         struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
1098 
1099         if (!desc)
1100                 return;
1101 
1102         /*
1103          * Warn when a driver sets the no autoenable flag on an already
1104          * active interrupt.
1105          */
1106         WARN_ON_ONCE(!desc->depth && (set & _IRQ_NOAUTOEN));
1107 
1108         irq_settings_clr_and_set(desc, clr, set);
1109 
1110         trigger = irqd_get_trigger_type(&desc->irq_data);
1111 
1112         irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
1113                    IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
1114         if (irq_settings_has_no_balance_set(desc))
1115                 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
1116         if (irq_settings_is_per_cpu(desc))
1117                 irqd_set(&desc->irq_data, IRQD_PER_CPU);
1118         if (irq_settings_can_move_pcntxt(desc))
1119                 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
1120         if (irq_settings_is_level(desc))
1121                 irqd_set(&desc->irq_data, IRQD_LEVEL);
1122 
1123         tmp = irq_settings_get_trigger_mask(desc);
1124         if (tmp != IRQ_TYPE_NONE)
1125                 trigger = tmp;
1126 
1127         irqd_set(&desc->irq_data, trigger);
1128 
1129         irq_put_desc_unlock(desc, flags);
1130 }
1131 EXPORT_SYMBOL_GPL(irq_modify_status);
1132 
1133 /**
1134  *      irq_cpu_online - Invoke all irq_cpu_online functions.
1135  *
1136  *      Iterate through all irqs and invoke the chip.irq_cpu_online()
1137  *      for each.
1138  */
1139 void irq_cpu_online(void)
1140 {
1141         struct irq_desc *desc;
1142         struct irq_chip *chip;
1143         unsigned long flags;
1144         unsigned int irq;
1145 
1146         for_each_active_irq(irq) {
1147                 desc = irq_to_desc(irq);
1148                 if (!desc)
1149                         continue;
1150 
1151                 raw_spin_lock_irqsave(&desc->lock, flags);
1152 
1153                 chip = irq_data_get_irq_chip(&desc->irq_data);
1154                 if (chip && chip->irq_cpu_online &&
1155                     (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1156                      !irqd_irq_disabled(&desc->irq_data)))
1157                         chip->irq_cpu_online(&desc->irq_data);
1158 
1159                 raw_spin_unlock_irqrestore(&desc->lock, flags);
1160         }
1161 }
1162 
1163 /**
1164  *      irq_cpu_offline - Invoke all irq_cpu_offline functions.
1165  *
1166  *      Iterate through all irqs and invoke the chip.irq_cpu_offline()
1167  *      for each.
1168  */
1169 void irq_cpu_offline(void)
1170 {
1171         struct irq_desc *desc;
1172         struct irq_chip *chip;
1173         unsigned long flags;
1174         unsigned int irq;
1175 
1176         for_each_active_irq(irq) {
1177                 desc = irq_to_desc(irq);
1178                 if (!desc)
1179                         continue;
1180 
1181                 raw_spin_lock_irqsave(&desc->lock, flags);
1182 
1183                 chip = irq_data_get_irq_chip(&desc->irq_data);
1184                 if (chip && chip->irq_cpu_offline &&
1185                     (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1186                      !irqd_irq_disabled(&desc->irq_data)))
1187                         chip->irq_cpu_offline(&desc->irq_data);
1188 
1189                 raw_spin_unlock_irqrestore(&desc->lock, flags);
1190         }
1191 }
1192 
1193 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
1194 
1195 #ifdef CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS
1196 /**
1197  *      handle_fasteoi_ack_irq - irq handler for edge hierarchy
1198  *      stacked on transparent controllers
1199  *
1200  *      @desc:  the interrupt description structure for this irq
1201  *
1202  *      Like handle_fasteoi_irq(), but for use with hierarchy where
1203  *      the irq_chip also needs to have its ->irq_ack() function
1204  *      called.
1205  */
1206 void handle_fasteoi_ack_irq(struct irq_desc *desc)
1207 {
1208         struct irq_chip *chip = desc->irq_data.chip;
1209 
1210         raw_spin_lock(&desc->lock);
1211 
1212         if (!irq_may_run(desc))
1213                 goto out;
1214 
1215         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1216 
1217         /*
1218          * If its disabled or no action available
1219          * then mask it and get out of here:
1220          */
1221         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1222                 desc->istate |= IRQS_PENDING;
1223                 mask_irq(desc);
1224                 goto out;
1225         }
1226 
1227         kstat_incr_irqs_this_cpu(desc);
1228         if (desc->istate & IRQS_ONESHOT)
1229                 mask_irq(desc);
1230 
1231         /* Start handling the irq */
1232         desc->irq_data.chip->irq_ack(&desc->irq_data);
1233 
1234         preflow_handler(desc);
1235         handle_irq_event(desc);
1236 
1237         cond_unmask_eoi_irq(desc, chip);
1238 
1239         raw_spin_unlock(&desc->lock);
1240         return;
1241 out:
1242         if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1243                 chip->irq_eoi(&desc->irq_data);
1244         raw_spin_unlock(&desc->lock);
1245 }
1246 EXPORT_SYMBOL_GPL(handle_fasteoi_ack_irq);
1247 
1248 /**
1249  *      handle_fasteoi_mask_irq - irq handler for level hierarchy
1250  *      stacked on transparent controllers
1251  *
1252  *      @desc:  the interrupt description structure for this irq
1253  *
1254  *      Like handle_fasteoi_irq(), but for use with hierarchy where
1255  *      the irq_chip also needs to have its ->irq_mask_ack() function
1256  *      called.
1257  */
1258 void handle_fasteoi_mask_irq(struct irq_desc *desc)
1259 {
1260         struct irq_chip *chip = desc->irq_data.chip;
1261 
1262         raw_spin_lock(&desc->lock);
1263         mask_ack_irq(desc);
1264 
1265         if (!irq_may_run(desc))
1266                 goto out;
1267 
1268         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1269 
1270         /*
1271          * If its disabled or no action available
1272          * then mask it and get out of here:
1273          */
1274         if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1275                 desc->istate |= IRQS_PENDING;
1276                 mask_irq(desc);
1277                 goto out;
1278         }
1279 
1280         kstat_incr_irqs_this_cpu(desc);
1281         if (desc->istate & IRQS_ONESHOT)
1282                 mask_irq(desc);
1283 
1284         preflow_handler(desc);
1285         handle_irq_event(desc);
1286 
1287         cond_unmask_eoi_irq(desc, chip);
1288 
1289         raw_spin_unlock(&desc->lock);
1290         return;
1291 out:
1292         if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1293                 chip->irq_eoi(&desc->irq_data);
1294         raw_spin_unlock(&desc->lock);
1295 }
1296 EXPORT_SYMBOL_GPL(handle_fasteoi_mask_irq);
1297 
1298 #endif /* CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS */
1299 
1300 /**
1301  * irq_chip_enable_parent - Enable the parent interrupt (defaults to unmask if
1302  * NULL)
1303  * @data:       Pointer to interrupt specific data
1304  */
1305 void irq_chip_enable_parent(struct irq_data *data)
1306 {
1307         data = data->parent_data;
1308         if (data->chip->irq_enable)
1309                 data->chip->irq_enable(data);
1310         else
1311                 data->chip->irq_unmask(data);
1312 }
1313 EXPORT_SYMBOL_GPL(irq_chip_enable_parent);
1314 
1315 /**
1316  * irq_chip_disable_parent - Disable the parent interrupt (defaults to mask if
1317  * NULL)
1318  * @data:       Pointer to interrupt specific data
1319  */
1320 void irq_chip_disable_parent(struct irq_data *data)
1321 {
1322         data = data->parent_data;
1323         if (data->chip->irq_disable)
1324                 data->chip->irq_disable(data);
1325         else
1326                 data->chip->irq_mask(data);
1327 }
1328 EXPORT_SYMBOL_GPL(irq_chip_disable_parent);
1329 
1330 /**
1331  * irq_chip_ack_parent - Acknowledge the parent interrupt
1332  * @data:       Pointer to interrupt specific data
1333  */
1334 void irq_chip_ack_parent(struct irq_data *data)
1335 {
1336         data = data->parent_data;
1337         data->chip->irq_ack(data);
1338 }
1339 EXPORT_SYMBOL_GPL(irq_chip_ack_parent);
1340 
1341 /**
1342  * irq_chip_mask_parent - Mask the parent interrupt
1343  * @data:       Pointer to interrupt specific data
1344  */
1345 void irq_chip_mask_parent(struct irq_data *data)
1346 {
1347         data = data->parent_data;
1348         data->chip->irq_mask(data);
1349 }
1350 EXPORT_SYMBOL_GPL(irq_chip_mask_parent);
1351 
1352 /**
1353  * irq_chip_mask_ack_parent - Mask and acknowledge the parent interrupt
1354  * @data:       Pointer to interrupt specific data
1355  */
1356 void irq_chip_mask_ack_parent(struct irq_data *data)
1357 {
1358         data = data->parent_data;
1359         data->chip->irq_mask_ack(data);
1360 }
1361 EXPORT_SYMBOL_GPL(irq_chip_mask_ack_parent);
1362 
1363 /**
1364  * irq_chip_unmask_parent - Unmask the parent interrupt
1365  * @data:       Pointer to interrupt specific data
1366  */
1367 void irq_chip_unmask_parent(struct irq_data *data)
1368 {
1369         data = data->parent_data;
1370         data->chip->irq_unmask(data);
1371 }
1372 EXPORT_SYMBOL_GPL(irq_chip_unmask_parent);
1373 
1374 /**
1375  * irq_chip_eoi_parent - Invoke EOI on the parent interrupt
1376  * @data:       Pointer to interrupt specific data
1377  */
1378 void irq_chip_eoi_parent(struct irq_data *data)
1379 {
1380         data = data->parent_data;
1381         data->chip->irq_eoi(data);
1382 }
1383 EXPORT_SYMBOL_GPL(irq_chip_eoi_parent);
1384 
1385 /**
1386  * irq_chip_set_affinity_parent - Set affinity on the parent interrupt
1387  * @data:       Pointer to interrupt specific data
1388  * @dest:       The affinity mask to set
1389  * @force:      Flag to enforce setting (disable online checks)
1390  *
1391  * Conditinal, as the underlying parent chip might not implement it.
1392  */
1393 int irq_chip_set_affinity_parent(struct irq_data *data,
1394                                  const struct cpumask *dest, bool force)
1395 {
1396         data = data->parent_data;
1397         if (data->chip->irq_set_affinity)
1398                 return data->chip->irq_set_affinity(data, dest, force);
1399 
1400         return -ENOSYS;
1401 }
1402 EXPORT_SYMBOL_GPL(irq_chip_set_affinity_parent);
1403 
1404 /**
1405  * irq_chip_set_type_parent - Set IRQ type on the parent interrupt
1406  * @data:       Pointer to interrupt specific data
1407  * @type:       IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
1408  *
1409  * Conditional, as the underlying parent chip might not implement it.
1410  */
1411 int irq_chip_set_type_parent(struct irq_data *data, unsigned int type)
1412 {
1413         data = data->parent_data;
1414 
1415         if (data->chip->irq_set_type)
1416                 return data->chip->irq_set_type(data, type);
1417 
1418         return -ENOSYS;
1419 }
1420 EXPORT_SYMBOL_GPL(irq_chip_set_type_parent);
1421 
1422 /**
1423  * irq_chip_retrigger_hierarchy - Retrigger an interrupt in hardware
1424  * @data:       Pointer to interrupt specific data
1425  *
1426  * Iterate through the domain hierarchy of the interrupt and check
1427  * whether a hw retrigger function exists. If yes, invoke it.
1428  */
1429 int irq_chip_retrigger_hierarchy(struct irq_data *data)
1430 {
1431         for (data = data->parent_data; data; data = data->parent_data)
1432                 if (data->chip && data->chip->irq_retrigger)
1433                         return data->chip->irq_retrigger(data);
1434 
1435         return 0;
1436 }
1437 
1438 /**
1439  * irq_chip_set_vcpu_affinity_parent - Set vcpu affinity on the parent interrupt
1440  * @data:       Pointer to interrupt specific data
1441  * @vcpu_info:  The vcpu affinity information
1442  */
1443 int irq_chip_set_vcpu_affinity_parent(struct irq_data *data, void *vcpu_info)
1444 {
1445         data = data->parent_data;
1446         if (data->chip->irq_set_vcpu_affinity)
1447                 return data->chip->irq_set_vcpu_affinity(data, vcpu_info);
1448 
1449         return -ENOSYS;
1450 }
1451 
1452 /**
1453  * irq_chip_set_wake_parent - Set/reset wake-up on the parent interrupt
1454  * @data:       Pointer to interrupt specific data
1455  * @on:         Whether to set or reset the wake-up capability of this irq
1456  *
1457  * Conditional, as the underlying parent chip might not implement it.
1458  */
1459 int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on)
1460 {
1461         data = data->parent_data;
1462 
1463         if (data->chip->flags & IRQCHIP_SKIP_SET_WAKE)
1464                 return 0;
1465 
1466         if (data->chip->irq_set_wake)
1467                 return data->chip->irq_set_wake(data, on);
1468 
1469         return -ENOSYS;
1470 }
1471 EXPORT_SYMBOL_GPL(irq_chip_set_wake_parent);
1472 
1473 /**
1474  * irq_chip_request_resources_parent - Request resources on the parent interrupt
1475  * @data:       Pointer to interrupt specific data
1476  */
1477 int irq_chip_request_resources_parent(struct irq_data *data)
1478 {
1479         data = data->parent_data;
1480 
1481         if (data->chip->irq_request_resources)
1482                 return data->chip->irq_request_resources(data);
1483 
1484         return -ENOSYS;
1485 }
1486 EXPORT_SYMBOL_GPL(irq_chip_request_resources_parent);
1487 
1488 /**
1489  * irq_chip_release_resources_parent - Release resources on the parent interrupt
1490  * @data:       Pointer to interrupt specific data
1491  */
1492 void irq_chip_release_resources_parent(struct irq_data *data)
1493 {
1494         data = data->parent_data;
1495         if (data->chip->irq_release_resources)
1496                 data->chip->irq_release_resources(data);
1497 }
1498 EXPORT_SYMBOL_GPL(irq_chip_release_resources_parent);
1499 #endif
1500 
1501 /**
1502  * irq_chip_compose_msi_msg - Componse msi message for a irq chip
1503  * @data:       Pointer to interrupt specific data
1504  * @msg:        Pointer to the MSI message
1505  *
1506  * For hierarchical domains we find the first chip in the hierarchy
1507  * which implements the irq_compose_msi_msg callback. For non
1508  * hierarchical we use the top level chip.
1509  */
1510 int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
1511 {
1512         struct irq_data *pos = NULL;
1513 
1514 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
1515         for (; data; data = data->parent_data)
1516 #endif
1517                 if (data->chip && data->chip->irq_compose_msi_msg)
1518                         pos = data;
1519         if (!pos)
1520                 return -ENOSYS;
1521 
1522         pos->chip->irq_compose_msi_msg(pos, msg);
1523 
1524         return 0;
1525 }
1526 
1527 /**
1528  * irq_chip_pm_get - Enable power for an IRQ chip
1529  * @data:       Pointer to interrupt specific data
1530  *
1531  * Enable the power to the IRQ chip referenced by the interrupt data
1532  * structure.
1533  */
1534 int irq_chip_pm_get(struct irq_data *data)
1535 {
1536         int retval;
1537 
1538         if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device) {
1539                 retval = pm_runtime_get_sync(data->chip->parent_device);
1540                 if (retval < 0) {
1541                         pm_runtime_put_noidle(data->chip->parent_device);
1542                         return retval;
1543                 }
1544         }
1545 
1546         return 0;
1547 }
1548 
1549 /**
1550  * irq_chip_pm_put - Disable power for an IRQ chip
1551  * @data:       Pointer to interrupt specific data
1552  *
1553  * Disable the power to the IRQ chip referenced by the interrupt data
1554  * structure, belongs. Note that power will only be disabled, once this
1555  * function has been called for all IRQs that have called irq_chip_pm_get().
1556  */
1557 int irq_chip_pm_put(struct irq_data *data)
1558 {
1559         int retval = 0;
1560 
1561         if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device)
1562                 retval = pm_runtime_put(data->chip->parent_device);
1563 
1564         return (retval < 0) ? retval : 0;
1565 }
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root/kernel/irq/chip.c

DEFINITIONS
