2 * Copyright 2008 Advanced Micro Devices, Inc.
3 * Copyright 2008 Red Hat Inc.
4 * Copyright 2009 Jerome Glisse.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
24 * Authors: Dave Airlie
30 * DOC: Interrupt Handling
32 * Interrupts generated within GPU hardware raise interrupt requests that are
33 * passed to amdgpu IRQ handler which is responsible for detecting source and
34 * type of the interrupt and dispatching matching handlers. If handling an
35 * interrupt requires calling kernel functions that may sleep processing is
36 * dispatched to work handlers.
38 * If MSI functionality is not disabled by module parameter then MSI
39 * support will be enabled.
41 * For GPU interrupt sources that may be driven by another driver, IRQ domain
42 * support is used (with mapping between virtual and hardware IRQs).
45 #include <linux/irq.h>
46 #include <linux/pci.h>
48 #include <drm/drm_vblank.h>
49 #include <drm/amdgpu_drm.h>
50 #include <drm/drm_drv.h>
52 #include "amdgpu_ih.h"
54 #include "amdgpu_connectors.h"
55 #include "amdgpu_trace.h"
56 #include "amdgpu_amdkfd.h"
57 #include "amdgpu_ras.h"
59 #include <linux/pm_runtime.h>
61 #ifdef CONFIG_DRM_AMD_DC
62 #include "amdgpu_dm_irq.h"
65 #define AMDGPU_WAIT_IDLE_TIMEOUT 200
67 const char *soc15_ih_clientid_name[] = {
102 const int node_id_to_phys_map[NODEID_MAX] = {
118 * amdgpu_irq_disable_all - disable *all* interrupts
120 * @adev: amdgpu device pointer
122 * Disable all types of interrupts from all sources.
124 void amdgpu_irq_disable_all(struct amdgpu_device *adev)
126 unsigned long irqflags;
127 unsigned int i, j, k;
130 spin_lock_irqsave(&adev->irq.lock, irqflags);
131 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
132 if (!adev->irq.client[i].sources)
135 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
136 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
138 if (!src || !src->funcs->set || !src->num_types)
141 for (k = 0; k < src->num_types; ++k) {
142 r = src->funcs->set(adev, src, k,
143 AMDGPU_IRQ_STATE_DISABLE);
145 DRM_ERROR("error disabling interrupt (%d)\n",
150 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
154 * amdgpu_irq_handler - IRQ handler
156 * @irq: IRQ number (unused)
157 * @arg: pointer to DRM device
159 * IRQ handler for amdgpu driver (all ASICs).
162 * result of handling the IRQ, as defined by &irqreturn_t
164 static irqreturn_t amdgpu_irq_handler(int irq, void *arg)
166 struct drm_device *dev = (struct drm_device *) arg;
167 struct amdgpu_device *adev = drm_to_adev(dev);
170 ret = amdgpu_ih_process(adev, &adev->irq.ih);
171 if (ret == IRQ_HANDLED)
172 pm_runtime_mark_last_busy(dev->dev);
174 amdgpu_ras_interrupt_fatal_error_handler(adev);
180 * amdgpu_irq_handle_ih1 - kick of processing for IH1
182 * @work: work structure in struct amdgpu_irq
184 * Kick of processing IH ring 1.
186 static void amdgpu_irq_handle_ih1(struct work_struct *work)
188 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
191 amdgpu_ih_process(adev, &adev->irq.ih1);
195 * amdgpu_irq_handle_ih2 - kick of processing for IH2
197 * @work: work structure in struct amdgpu_irq
199 * Kick of processing IH ring 2.
201 static void amdgpu_irq_handle_ih2(struct work_struct *work)
203 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
206 amdgpu_ih_process(adev, &adev->irq.ih2);
210 * amdgpu_irq_handle_ih_soft - kick of processing for ih_soft
212 * @work: work structure in struct amdgpu_irq
214 * Kick of processing IH soft ring.
216 static void amdgpu_irq_handle_ih_soft(struct work_struct *work)
218 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
221 amdgpu_ih_process(adev, &adev->irq.ih_soft);
225 * amdgpu_msi_ok - check whether MSI functionality is enabled
227 * @adev: amdgpu device pointer (unused)
229 * Checks whether MSI functionality has been disabled via module parameter
233 * *true* if MSIs are allowed to be enabled or *false* otherwise
235 static bool amdgpu_msi_ok(struct amdgpu_device *adev)
239 else if (amdgpu_msi == 0)
245 static void amdgpu_restore_msix(struct amdgpu_device *adev)
249 pci_read_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, &ctrl);
250 if (!(ctrl & PCI_MSIX_FLAGS_ENABLE))
254 ctrl &= ~PCI_MSIX_FLAGS_ENABLE;
255 pci_write_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, ctrl);
256 ctrl |= PCI_MSIX_FLAGS_ENABLE;
257 pci_write_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, ctrl);
261 * amdgpu_irq_init - initialize interrupt handling
263 * @adev: amdgpu device pointer
265 * Sets up work functions for hotplug and reset interrupts, enables MSI
266 * functionality, initializes vblank, hotplug and reset interrupt handling.
269 * 0 on success or error code on failure
271 int amdgpu_irq_init(struct amdgpu_device *adev)
276 spin_lock_init(&adev->irq.lock);
278 /* Enable MSI if not disabled by module parameter */
279 adev->irq.msi_enabled = false;
281 if (amdgpu_msi_ok(adev)) {
282 int nvec = pci_msix_vec_count(adev->pdev);
288 flags = PCI_IRQ_MSI | PCI_IRQ_MSIX;
290 /* we only need one vector */
291 nvec = pci_alloc_irq_vectors(adev->pdev, 1, 1, flags);
293 adev->irq.msi_enabled = true;
294 dev_dbg(adev->dev, "using MSI/MSI-X.\n");
298 INIT_WORK(&adev->irq.ih1_work, amdgpu_irq_handle_ih1);
299 INIT_WORK(&adev->irq.ih2_work, amdgpu_irq_handle_ih2);
300 INIT_WORK(&adev->irq.ih_soft_work, amdgpu_irq_handle_ih_soft);
302 /* Use vector 0 for MSI-X. */
303 r = pci_irq_vector(adev->pdev, 0);
308 /* PCI devices require shared interrupts. */
309 r = request_irq(irq, amdgpu_irq_handler, IRQF_SHARED, adev_to_drm(adev)->driver->name,
313 adev->irq.installed = true;
315 adev_to_drm(adev)->max_vblank_count = 0x00ffffff;
317 DRM_DEBUG("amdgpu: irq initialized.\n");
322 void amdgpu_irq_fini_hw(struct amdgpu_device *adev)
324 if (adev->irq.installed) {
325 free_irq(adev->irq.irq, adev_to_drm(adev));
326 adev->irq.installed = false;
327 if (adev->irq.msi_enabled)
328 pci_free_irq_vectors(adev->pdev);
331 amdgpu_ih_ring_fini(adev, &adev->irq.ih_soft);
332 amdgpu_ih_ring_fini(adev, &adev->irq.ih);
333 amdgpu_ih_ring_fini(adev, &adev->irq.ih1);
334 amdgpu_ih_ring_fini(adev, &adev->irq.ih2);
338 * amdgpu_irq_fini_sw - shut down interrupt handling
340 * @adev: amdgpu device pointer
342 * Tears down work functions for hotplug and reset interrupts, disables MSI
343 * functionality, shuts down vblank, hotplug and reset interrupt handling,
344 * turns off interrupts from all sources (all ASICs).
346 void amdgpu_irq_fini_sw(struct amdgpu_device *adev)
350 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
351 if (!adev->irq.client[i].sources)
354 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
355 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
360 kfree(src->enabled_types);
361 src->enabled_types = NULL;
363 kfree(adev->irq.client[i].sources);
364 adev->irq.client[i].sources = NULL;
369 * amdgpu_irq_add_id - register IRQ source
371 * @adev: amdgpu device pointer
372 * @client_id: client id
374 * @source: IRQ source pointer
376 * Registers IRQ source on a client.
379 * 0 on success or error code otherwise
381 int amdgpu_irq_add_id(struct amdgpu_device *adev,
382 unsigned int client_id, unsigned int src_id,
383 struct amdgpu_irq_src *source)
385 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX)
388 if (src_id >= AMDGPU_MAX_IRQ_SRC_ID)
394 if (!adev->irq.client[client_id].sources) {
395 adev->irq.client[client_id].sources =
396 kcalloc(AMDGPU_MAX_IRQ_SRC_ID,
397 sizeof(struct amdgpu_irq_src *),
399 if (!adev->irq.client[client_id].sources)
403 if (adev->irq.client[client_id].sources[src_id] != NULL)
406 if (source->num_types && !source->enabled_types) {
409 types = kcalloc(source->num_types, sizeof(atomic_t),
414 source->enabled_types = types;
417 adev->irq.client[client_id].sources[src_id] = source;
422 * amdgpu_irq_dispatch - dispatch IRQ to IP blocks
424 * @adev: amdgpu device pointer
425 * @ih: interrupt ring instance
427 * Dispatches IRQ to IP blocks.
429 void amdgpu_irq_dispatch(struct amdgpu_device *adev,
430 struct amdgpu_ih_ring *ih)
432 u32 ring_index = ih->rptr >> 2;
433 struct amdgpu_iv_entry entry;
434 unsigned int client_id, src_id;
435 struct amdgpu_irq_src *src;
436 bool handled = false;
440 entry.iv_entry = (const uint32_t *)&ih->ring[ring_index];
441 amdgpu_ih_decode_iv(adev, &entry);
443 trace_amdgpu_iv(ih - &adev->irq.ih, &entry);
445 client_id = entry.client_id;
446 src_id = entry.src_id;
448 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX) {
449 DRM_DEBUG("Invalid client_id in IV: %d\n", client_id);
451 } else if (src_id >= AMDGPU_MAX_IRQ_SRC_ID) {
452 DRM_DEBUG("Invalid src_id in IV: %d\n", src_id);
454 } else if ((client_id == AMDGPU_IRQ_CLIENTID_LEGACY) &&
455 adev->irq.virq[src_id]) {
456 generic_handle_domain_irq(adev->irq.domain, src_id);
458 } else if (!adev->irq.client[client_id].sources) {
459 DRM_DEBUG("Unregistered interrupt client_id: %d src_id: %d\n",
462 } else if ((src = adev->irq.client[client_id].sources[src_id])) {
463 r = src->funcs->process(adev, src, &entry);
465 DRM_ERROR("error processing interrupt (%d)\n", r);
470 DRM_DEBUG("Unhandled interrupt src_id: %d\n", src_id);
473 /* Send it to amdkfd as well if it isn't already handled */
475 amdgpu_amdkfd_interrupt(adev, entry.iv_entry);
477 if (amdgpu_ih_ts_after(ih->processed_timestamp, entry.timestamp))
478 ih->processed_timestamp = entry.timestamp;
482 * amdgpu_irq_delegate - delegate IV to soft IH ring
484 * @adev: amdgpu device pointer
486 * @num_dw: size of IV
488 * Delegate the IV to the soft IH ring and schedule processing of it. Used
489 * if the hardware delegation to IH1 or IH2 doesn't work for some reason.
491 void amdgpu_irq_delegate(struct amdgpu_device *adev,
492 struct amdgpu_iv_entry *entry,
495 amdgpu_ih_ring_write(&adev->irq.ih_soft, entry->iv_entry, num_dw);
496 schedule_work(&adev->irq.ih_soft_work);
500 * amdgpu_irq_update - update hardware interrupt state
502 * @adev: amdgpu device pointer
503 * @src: interrupt source pointer
504 * @type: type of interrupt
506 * Updates interrupt state for the specific source (all ASICs).
508 int amdgpu_irq_update(struct amdgpu_device *adev,
509 struct amdgpu_irq_src *src, unsigned int type)
511 unsigned long irqflags;
512 enum amdgpu_interrupt_state state;
515 spin_lock_irqsave(&adev->irq.lock, irqflags);
517 /* We need to determine after taking the lock, otherwise
518 * we might disable just enabled interrupts again
520 if (amdgpu_irq_enabled(adev, src, type))
521 state = AMDGPU_IRQ_STATE_ENABLE;
523 state = AMDGPU_IRQ_STATE_DISABLE;
525 r = src->funcs->set(adev, src, type, state);
526 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
531 * amdgpu_irq_gpu_reset_resume_helper - update interrupt states on all sources
533 * @adev: amdgpu device pointer
535 * Updates state of all types of interrupts on all sources on resume after
538 void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev)
542 if (amdgpu_sriov_vf(adev) || amdgpu_passthrough(adev))
543 amdgpu_restore_msix(adev);
545 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
546 if (!adev->irq.client[i].sources)
549 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
550 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
552 if (!src || !src->funcs || !src->funcs->set)
554 for (k = 0; k < src->num_types; k++)
555 amdgpu_irq_update(adev, src, k);
561 * amdgpu_irq_get - enable interrupt
563 * @adev: amdgpu device pointer
564 * @src: interrupt source pointer
565 * @type: type of interrupt
567 * Enables specified type of interrupt on the specified source (all ASICs).
570 * 0 on success or error code otherwise
572 int amdgpu_irq_get(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
575 if (!adev->irq.installed)
578 if (type >= src->num_types)
581 if (!src->enabled_types || !src->funcs->set)
584 if (atomic_inc_return(&src->enabled_types[type]) == 1)
585 return amdgpu_irq_update(adev, src, type);
591 * amdgpu_irq_put - disable interrupt
593 * @adev: amdgpu device pointer
594 * @src: interrupt source pointer
595 * @type: type of interrupt
597 * Enables specified type of interrupt on the specified source (all ASICs).
600 * 0 on success or error code otherwise
602 int amdgpu_irq_put(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
605 if (!adev->irq.installed)
608 if (type >= src->num_types)
611 if (!src->enabled_types || !src->funcs->set)
614 if (WARN_ON(!amdgpu_irq_enabled(adev, src, type)))
617 if (atomic_dec_and_test(&src->enabled_types[type]))
618 return amdgpu_irq_update(adev, src, type);
624 * amdgpu_irq_enabled - check whether interrupt is enabled or not
626 * @adev: amdgpu device pointer
627 * @src: interrupt source pointer
628 * @type: type of interrupt
630 * Checks whether the given type of interrupt is enabled on the given source.
633 * *true* if interrupt is enabled, *false* if interrupt is disabled or on
636 bool amdgpu_irq_enabled(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
639 if (!adev->irq.installed)
642 if (type >= src->num_types)
645 if (!src->enabled_types || !src->funcs->set)
648 return !!atomic_read(&src->enabled_types[type]);
651 /* XXX: Generic IRQ handling */
652 static void amdgpu_irq_mask(struct irq_data *irqd)
657 static void amdgpu_irq_unmask(struct irq_data *irqd)
662 /* amdgpu hardware interrupt chip descriptor */
663 static struct irq_chip amdgpu_irq_chip = {
665 .irq_mask = amdgpu_irq_mask,
666 .irq_unmask = amdgpu_irq_unmask,
670 * amdgpu_irqdomain_map - create mapping between virtual and hardware IRQ numbers
672 * @d: amdgpu IRQ domain pointer (unused)
673 * @irq: virtual IRQ number
674 * @hwirq: hardware irq number
676 * Current implementation assigns simple interrupt handler to the given virtual
680 * 0 on success or error code otherwise
682 static int amdgpu_irqdomain_map(struct irq_domain *d,
683 unsigned int irq, irq_hw_number_t hwirq)
685 if (hwirq >= AMDGPU_MAX_IRQ_SRC_ID)
688 irq_set_chip_and_handler(irq,
689 &amdgpu_irq_chip, handle_simple_irq);
693 /* Implementation of methods for amdgpu IRQ domain */
694 static const struct irq_domain_ops amdgpu_hw_irqdomain_ops = {
695 .map = amdgpu_irqdomain_map,
699 * amdgpu_irq_add_domain - create a linear IRQ domain
701 * @adev: amdgpu device pointer
703 * Creates an IRQ domain for GPU interrupt sources
704 * that may be driven by another driver (e.g., ACP).
707 * 0 on success or error code otherwise
709 int amdgpu_irq_add_domain(struct amdgpu_device *adev)
711 adev->irq.domain = irq_domain_add_linear(NULL, AMDGPU_MAX_IRQ_SRC_ID,
712 &amdgpu_hw_irqdomain_ops, adev);
713 if (!adev->irq.domain) {
714 DRM_ERROR("GPU irq add domain failed\n");
722 * amdgpu_irq_remove_domain - remove the IRQ domain
724 * @adev: amdgpu device pointer
726 * Removes the IRQ domain for GPU interrupt sources
727 * that may be driven by another driver (e.g., ACP).
729 void amdgpu_irq_remove_domain(struct amdgpu_device *adev)
731 if (adev->irq.domain) {
732 irq_domain_remove(adev->irq.domain);
733 adev->irq.domain = NULL;
738 * amdgpu_irq_create_mapping - create mapping between domain Linux IRQs
740 * @adev: amdgpu device pointer
741 * @src_id: IH source id
743 * Creates mapping between a domain IRQ (GPU IH src id) and a Linux IRQ
744 * Use this for components that generate a GPU interrupt, but are driven
745 * by a different driver (e.g., ACP).
750 unsigned int amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned int src_id)
752 adev->irq.virq[src_id] = irq_create_mapping(adev->irq.domain, src_id);
754 return adev->irq.virq[src_id];