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_crtc_helper.h>
49 #include <drm/drm_vblank.h>
50 #include <drm/amdgpu_drm.h>
51 #include <drm/drm_drv.h>
53 #include "amdgpu_ih.h"
55 #include "amdgpu_connectors.h"
56 #include "amdgpu_trace.h"
57 #include "amdgpu_amdkfd.h"
58 #include "amdgpu_ras.h"
60 #include <linux/pm_runtime.h>
62 #ifdef CONFIG_DRM_AMD_DC
63 #include "amdgpu_dm_irq.h"
66 #define AMDGPU_WAIT_IDLE_TIMEOUT 200
68 const char *soc15_ih_clientid_name[] = {
104 * amdgpu_hotplug_work_func - work handler for display hotplug event
106 * @work: work struct pointer
108 * This is the hotplug event work handler (all ASICs).
109 * The work gets scheduled from the IRQ handler if there
110 * was a hotplug interrupt. It walks through the connector table
111 * and calls hotplug handler for each connector. After this, it sends
112 * a DRM hotplug event to alert userspace.
114 * This design approach is required in order to defer hotplug event handling
115 * from the IRQ handler to a work handler because hotplug handler has to use
116 * mutexes which cannot be locked in an IRQ handler (since &mutex_lock may
119 static void amdgpu_hotplug_work_func(struct work_struct *work)
121 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
123 struct drm_device *dev = adev_to_drm(adev);
124 struct drm_mode_config *mode_config = &dev->mode_config;
125 struct drm_connector *connector;
126 struct drm_connector_list_iter iter;
128 mutex_lock(&mode_config->mutex);
129 drm_connector_list_iter_begin(dev, &iter);
130 drm_for_each_connector_iter(connector, &iter)
131 amdgpu_connector_hotplug(connector);
132 drm_connector_list_iter_end(&iter);
133 mutex_unlock(&mode_config->mutex);
134 /* Just fire off a uevent and let userspace tell us what to do */
135 drm_helper_hpd_irq_event(dev);
139 * amdgpu_irq_disable_all - disable *all* interrupts
141 * @adev: amdgpu device pointer
143 * Disable all types of interrupts from all sources.
145 void amdgpu_irq_disable_all(struct amdgpu_device *adev)
147 unsigned long irqflags;
151 spin_lock_irqsave(&adev->irq.lock, irqflags);
152 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
153 if (!adev->irq.client[i].sources)
156 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
157 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
159 if (!src || !src->funcs->set || !src->num_types)
162 for (k = 0; k < src->num_types; ++k) {
163 atomic_set(&src->enabled_types[k], 0);
164 r = src->funcs->set(adev, src, k,
165 AMDGPU_IRQ_STATE_DISABLE);
167 DRM_ERROR("error disabling interrupt (%d)\n",
172 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
176 * amdgpu_irq_handler - IRQ handler
178 * @irq: IRQ number (unused)
179 * @arg: pointer to DRM device
181 * IRQ handler for amdgpu driver (all ASICs).
184 * result of handling the IRQ, as defined by &irqreturn_t
186 static irqreturn_t amdgpu_irq_handler(int irq, void *arg)
188 struct drm_device *dev = (struct drm_device *) arg;
189 struct amdgpu_device *adev = drm_to_adev(dev);
192 ret = amdgpu_ih_process(adev, &adev->irq.ih);
193 if (ret == IRQ_HANDLED)
194 pm_runtime_mark_last_busy(dev->dev);
196 amdgpu_ras_interrupt_fatal_error_handler(adev);
202 * amdgpu_irq_handle_ih1 - kick of processing for IH1
204 * @work: work structure in struct amdgpu_irq
206 * Kick of processing IH ring 1.
208 static void amdgpu_irq_handle_ih1(struct work_struct *work)
210 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
213 amdgpu_ih_process(adev, &adev->irq.ih1);
217 * amdgpu_irq_handle_ih2 - kick of processing for IH2
219 * @work: work structure in struct amdgpu_irq
221 * Kick of processing IH ring 2.
223 static void amdgpu_irq_handle_ih2(struct work_struct *work)
225 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
228 amdgpu_ih_process(adev, &adev->irq.ih2);
232 * amdgpu_irq_handle_ih_soft - kick of processing for ih_soft
234 * @work: work structure in struct amdgpu_irq
236 * Kick of processing IH soft ring.
238 static void amdgpu_irq_handle_ih_soft(struct work_struct *work)
240 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
243 amdgpu_ih_process(adev, &adev->irq.ih_soft);
247 * amdgpu_msi_ok - check whether MSI functionality is enabled
249 * @adev: amdgpu device pointer (unused)
251 * Checks whether MSI functionality has been disabled via module parameter
255 * *true* if MSIs are allowed to be enabled or *false* otherwise
257 static bool amdgpu_msi_ok(struct amdgpu_device *adev)
261 else if (amdgpu_msi == 0)
267 static void amdgpu_restore_msix(struct amdgpu_device *adev)
271 pci_read_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, &ctrl);
272 if (!(ctrl & PCI_MSIX_FLAGS_ENABLE))
276 ctrl &= ~PCI_MSIX_FLAGS_ENABLE;
277 pci_write_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, ctrl);
278 ctrl |= PCI_MSIX_FLAGS_ENABLE;
279 pci_write_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, ctrl);
283 * amdgpu_irq_init - initialize interrupt handling
285 * @adev: amdgpu device pointer
287 * Sets up work functions for hotplug and reset interrupts, enables MSI
288 * functionality, initializes vblank, hotplug and reset interrupt handling.
291 * 0 on success or error code on failure
293 int amdgpu_irq_init(struct amdgpu_device *adev)
298 spin_lock_init(&adev->irq.lock);
300 /* Enable MSI if not disabled by module parameter */
301 adev->irq.msi_enabled = false;
303 if (amdgpu_msi_ok(adev)) {
304 int nvec = pci_msix_vec_count(adev->pdev);
310 flags = PCI_IRQ_MSI | PCI_IRQ_MSIX;
312 /* we only need one vector */
313 nvec = pci_alloc_irq_vectors(adev->pdev, 1, 1, flags);
315 adev->irq.msi_enabled = true;
316 dev_dbg(adev->dev, "using MSI/MSI-X.\n");
320 if (!amdgpu_device_has_dc_support(adev)) {
321 if (!adev->enable_virtual_display)
322 /* Disable vblank IRQs aggressively for power-saving */
323 adev_to_drm(adev)->vblank_disable_immediate = true;
325 r = drm_vblank_init(adev_to_drm(adev), adev->mode_info.num_crtc);
330 INIT_WORK(&adev->hotplug_work,
331 amdgpu_hotplug_work_func);
334 INIT_WORK(&adev->irq.ih1_work, amdgpu_irq_handle_ih1);
335 INIT_WORK(&adev->irq.ih2_work, amdgpu_irq_handle_ih2);
336 INIT_WORK(&adev->irq.ih_soft_work, amdgpu_irq_handle_ih_soft);
338 /* Use vector 0 for MSI-X. */
339 r = pci_irq_vector(adev->pdev, 0);
344 /* PCI devices require shared interrupts. */
345 r = request_irq(irq, amdgpu_irq_handler, IRQF_SHARED, adev_to_drm(adev)->driver->name,
348 if (!amdgpu_device_has_dc_support(adev))
349 flush_work(&adev->hotplug_work);
352 adev->irq.installed = true;
354 adev_to_drm(adev)->max_vblank_count = 0x00ffffff;
356 DRM_DEBUG("amdgpu: irq initialized.\n");
361 void amdgpu_irq_fini_hw(struct amdgpu_device *adev)
363 if (adev->irq.installed) {
364 free_irq(adev->irq.irq, adev_to_drm(adev));
365 adev->irq.installed = false;
366 if (adev->irq.msi_enabled)
367 pci_free_irq_vectors(adev->pdev);
369 if (!amdgpu_device_has_dc_support(adev))
370 flush_work(&adev->hotplug_work);
373 amdgpu_ih_ring_fini(adev, &adev->irq.ih_soft);
374 amdgpu_ih_ring_fini(adev, &adev->irq.ih);
375 amdgpu_ih_ring_fini(adev, &adev->irq.ih1);
376 amdgpu_ih_ring_fini(adev, &adev->irq.ih2);
380 * amdgpu_irq_fini_sw - shut down interrupt handling
382 * @adev: amdgpu device pointer
384 * Tears down work functions for hotplug and reset interrupts, disables MSI
385 * functionality, shuts down vblank, hotplug and reset interrupt handling,
386 * turns off interrupts from all sources (all ASICs).
388 void amdgpu_irq_fini_sw(struct amdgpu_device *adev)
392 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
393 if (!adev->irq.client[i].sources)
396 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
397 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
402 kfree(src->enabled_types);
403 src->enabled_types = NULL;
405 kfree(adev->irq.client[i].sources);
406 adev->irq.client[i].sources = NULL;
411 * amdgpu_irq_add_id - register IRQ source
413 * @adev: amdgpu device pointer
414 * @client_id: client id
416 * @source: IRQ source pointer
418 * Registers IRQ source on a client.
421 * 0 on success or error code otherwise
423 int amdgpu_irq_add_id(struct amdgpu_device *adev,
424 unsigned client_id, unsigned src_id,
425 struct amdgpu_irq_src *source)
427 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX)
430 if (src_id >= AMDGPU_MAX_IRQ_SRC_ID)
436 if (!adev->irq.client[client_id].sources) {
437 adev->irq.client[client_id].sources =
438 kcalloc(AMDGPU_MAX_IRQ_SRC_ID,
439 sizeof(struct amdgpu_irq_src *),
441 if (!adev->irq.client[client_id].sources)
445 if (adev->irq.client[client_id].sources[src_id] != NULL)
448 if (source->num_types && !source->enabled_types) {
451 types = kcalloc(source->num_types, sizeof(atomic_t),
456 source->enabled_types = types;
459 adev->irq.client[client_id].sources[src_id] = source;
464 * amdgpu_irq_dispatch - dispatch IRQ to IP blocks
466 * @adev: amdgpu device pointer
467 * @ih: interrupt ring instance
469 * Dispatches IRQ to IP blocks.
471 void amdgpu_irq_dispatch(struct amdgpu_device *adev,
472 struct amdgpu_ih_ring *ih)
474 u32 ring_index = ih->rptr >> 2;
475 struct amdgpu_iv_entry entry;
476 unsigned client_id, src_id;
477 struct amdgpu_irq_src *src;
478 bool handled = false;
482 entry.iv_entry = (const uint32_t *)&ih->ring[ring_index];
483 amdgpu_ih_decode_iv(adev, &entry);
485 trace_amdgpu_iv(ih - &adev->irq.ih, &entry);
487 client_id = entry.client_id;
488 src_id = entry.src_id;
490 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX) {
491 DRM_DEBUG("Invalid client_id in IV: %d\n", client_id);
493 } else if (src_id >= AMDGPU_MAX_IRQ_SRC_ID) {
494 DRM_DEBUG("Invalid src_id in IV: %d\n", src_id);
496 } else if ((client_id == AMDGPU_IRQ_CLIENTID_LEGACY) &&
497 adev->irq.virq[src_id]) {
498 generic_handle_domain_irq(adev->irq.domain, src_id);
500 } else if (!adev->irq.client[client_id].sources) {
501 DRM_DEBUG("Unregistered interrupt client_id: %d src_id: %d\n",
504 } else if ((src = adev->irq.client[client_id].sources[src_id])) {
505 r = src->funcs->process(adev, src, &entry);
507 DRM_ERROR("error processing interrupt (%d)\n", r);
512 DRM_DEBUG("Unhandled interrupt src_id: %d\n", src_id);
515 /* Send it to amdkfd as well if it isn't already handled */
517 amdgpu_amdkfd_interrupt(adev, entry.iv_entry);
519 if (amdgpu_ih_ts_after(ih->processed_timestamp, entry.timestamp))
520 ih->processed_timestamp = entry.timestamp;
524 * amdgpu_irq_delegate - delegate IV to soft IH ring
526 * @adev: amdgpu device pointer
528 * @num_dw: size of IV
530 * Delegate the IV to the soft IH ring and schedule processing of it. Used
531 * if the hardware delegation to IH1 or IH2 doesn't work for some reason.
533 void amdgpu_irq_delegate(struct amdgpu_device *adev,
534 struct amdgpu_iv_entry *entry,
537 amdgpu_ih_ring_write(&adev->irq.ih_soft, entry->iv_entry, num_dw);
538 schedule_work(&adev->irq.ih_soft_work);
542 * amdgpu_irq_update - update hardware interrupt state
544 * @adev: amdgpu device pointer
545 * @src: interrupt source pointer
546 * @type: type of interrupt
548 * Updates interrupt state for the specific source (all ASICs).
550 int amdgpu_irq_update(struct amdgpu_device *adev,
551 struct amdgpu_irq_src *src, unsigned type)
553 unsigned long irqflags;
554 enum amdgpu_interrupt_state state;
557 spin_lock_irqsave(&adev->irq.lock, irqflags);
559 /* We need to determine after taking the lock, otherwise
560 we might disable just enabled interrupts again */
561 if (amdgpu_irq_enabled(adev, src, type))
562 state = AMDGPU_IRQ_STATE_ENABLE;
564 state = AMDGPU_IRQ_STATE_DISABLE;
566 r = src->funcs->set(adev, src, type, state);
567 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
572 * amdgpu_irq_gpu_reset_resume_helper - update interrupt states on all sources
574 * @adev: amdgpu device pointer
576 * Updates state of all types of interrupts on all sources on resume after
579 void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev)
583 if (amdgpu_sriov_vf(adev) || amdgpu_passthrough(adev))
584 amdgpu_restore_msix(adev);
586 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
587 if (!adev->irq.client[i].sources)
590 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
591 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
593 if (!src || !src->funcs || !src->funcs->set)
595 for (k = 0; k < src->num_types; k++)
596 amdgpu_irq_update(adev, src, k);
602 * amdgpu_irq_get - enable interrupt
604 * @adev: amdgpu device pointer
605 * @src: interrupt source pointer
606 * @type: type of interrupt
608 * Enables specified type of interrupt on the specified source (all ASICs).
611 * 0 on success or error code otherwise
613 int amdgpu_irq_get(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
616 if (!adev->irq.installed)
619 if (type >= src->num_types)
622 if (!src->enabled_types || !src->funcs->set)
625 if (atomic_inc_return(&src->enabled_types[type]) == 1)
626 return amdgpu_irq_update(adev, src, type);
632 * amdgpu_irq_put - disable interrupt
634 * @adev: amdgpu device pointer
635 * @src: interrupt source pointer
636 * @type: type of interrupt
638 * Enables specified type of interrupt on the specified source (all ASICs).
641 * 0 on success or error code otherwise
643 int amdgpu_irq_put(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
646 if (!adev->irq.installed)
649 if (type >= src->num_types)
652 if (!src->enabled_types || !src->funcs->set)
655 if (atomic_dec_and_test(&src->enabled_types[type]))
656 return amdgpu_irq_update(adev, src, type);
662 * amdgpu_irq_enabled - check whether interrupt is enabled or not
664 * @adev: amdgpu device pointer
665 * @src: interrupt source pointer
666 * @type: type of interrupt
668 * Checks whether the given type of interrupt is enabled on the given source.
671 * *true* if interrupt is enabled, *false* if interrupt is disabled or on
674 bool amdgpu_irq_enabled(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
677 if (!adev->irq.installed)
680 if (type >= src->num_types)
683 if (!src->enabled_types || !src->funcs->set)
686 return !!atomic_read(&src->enabled_types[type]);
689 /* XXX: Generic IRQ handling */
690 static void amdgpu_irq_mask(struct irq_data *irqd)
695 static void amdgpu_irq_unmask(struct irq_data *irqd)
700 /* amdgpu hardware interrupt chip descriptor */
701 static struct irq_chip amdgpu_irq_chip = {
703 .irq_mask = amdgpu_irq_mask,
704 .irq_unmask = amdgpu_irq_unmask,
708 * amdgpu_irqdomain_map - create mapping between virtual and hardware IRQ numbers
710 * @d: amdgpu IRQ domain pointer (unused)
711 * @irq: virtual IRQ number
712 * @hwirq: hardware irq number
714 * Current implementation assigns simple interrupt handler to the given virtual
718 * 0 on success or error code otherwise
720 static int amdgpu_irqdomain_map(struct irq_domain *d,
721 unsigned int irq, irq_hw_number_t hwirq)
723 if (hwirq >= AMDGPU_MAX_IRQ_SRC_ID)
726 irq_set_chip_and_handler(irq,
727 &amdgpu_irq_chip, handle_simple_irq);
731 /* Implementation of methods for amdgpu IRQ domain */
732 static const struct irq_domain_ops amdgpu_hw_irqdomain_ops = {
733 .map = amdgpu_irqdomain_map,
737 * amdgpu_irq_add_domain - create a linear IRQ domain
739 * @adev: amdgpu device pointer
741 * Creates an IRQ domain for GPU interrupt sources
742 * that may be driven by another driver (e.g., ACP).
745 * 0 on success or error code otherwise
747 int amdgpu_irq_add_domain(struct amdgpu_device *adev)
749 adev->irq.domain = irq_domain_add_linear(NULL, AMDGPU_MAX_IRQ_SRC_ID,
750 &amdgpu_hw_irqdomain_ops, adev);
751 if (!adev->irq.domain) {
752 DRM_ERROR("GPU irq add domain failed\n");
760 * amdgpu_irq_remove_domain - remove the IRQ domain
762 * @adev: amdgpu device pointer
764 * Removes the IRQ domain for GPU interrupt sources
765 * that may be driven by another driver (e.g., ACP).
767 void amdgpu_irq_remove_domain(struct amdgpu_device *adev)
769 if (adev->irq.domain) {
770 irq_domain_remove(adev->irq.domain);
771 adev->irq.domain = NULL;
776 * amdgpu_irq_create_mapping - create mapping between domain Linux IRQs
778 * @adev: amdgpu device pointer
779 * @src_id: IH source id
781 * Creates mapping between a domain IRQ (GPU IH src id) and a Linux IRQ
782 * Use this for components that generate a GPU interrupt, but are driven
783 * by a different driver (e.g., ACP).
788 unsigned amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned src_id)
790 adev->irq.virq[src_id] = irq_create_mapping(adev->irq.domain, src_id);
792 return adev->irq.virq[src_id];