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_irq.h>
50 #include <drm/drm_vblank.h>
51 #include <drm/amdgpu_drm.h>
52 #include <drm/drm_drv.h>
54 #include "amdgpu_ih.h"
56 #include "amdgpu_connectors.h"
57 #include "amdgpu_trace.h"
58 #include "amdgpu_amdkfd.h"
59 #include "amdgpu_ras.h"
61 #include <linux/pm_runtime.h>
63 #ifdef CONFIG_DRM_AMD_DC
64 #include "amdgpu_dm_irq.h"
67 #define AMDGPU_WAIT_IDLE_TIMEOUT 200
69 const char *soc15_ih_clientid_name[] = {
105 * amdgpu_hotplug_work_func - work handler for display hotplug event
107 * @work: work struct pointer
109 * This is the hotplug event work handler (all ASICs).
110 * The work gets scheduled from the IRQ handler if there
111 * was a hotplug interrupt. It walks through the connector table
112 * and calls hotplug handler for each connector. After this, it sends
113 * a DRM hotplug event to alert userspace.
115 * This design approach is required in order to defer hotplug event handling
116 * from the IRQ handler to a work handler because hotplug handler has to use
117 * mutexes which cannot be locked in an IRQ handler (since &mutex_lock may
120 static void amdgpu_hotplug_work_func(struct work_struct *work)
122 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
124 struct drm_device *dev = adev_to_drm(adev);
125 struct drm_mode_config *mode_config = &dev->mode_config;
126 struct drm_connector *connector;
127 struct drm_connector_list_iter iter;
129 mutex_lock(&mode_config->mutex);
130 drm_connector_list_iter_begin(dev, &iter);
131 drm_for_each_connector_iter(connector, &iter)
132 amdgpu_connector_hotplug(connector);
133 drm_connector_list_iter_end(&iter);
134 mutex_unlock(&mode_config->mutex);
135 /* Just fire off a uevent and let userspace tell us what to do */
136 drm_helper_hpd_irq_event(dev);
140 * amdgpu_irq_disable_all - disable *all* interrupts
142 * @adev: amdgpu device pointer
144 * Disable all types of interrupts from all sources.
146 void amdgpu_irq_disable_all(struct amdgpu_device *adev)
148 unsigned long irqflags;
152 spin_lock_irqsave(&adev->irq.lock, irqflags);
153 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
154 if (!adev->irq.client[i].sources)
157 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
158 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
160 if (!src || !src->funcs->set || !src->num_types)
163 for (k = 0; k < src->num_types; ++k) {
164 atomic_set(&src->enabled_types[k], 0);
165 r = src->funcs->set(adev, src, k,
166 AMDGPU_IRQ_STATE_DISABLE);
168 DRM_ERROR("error disabling interrupt (%d)\n",
173 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
177 * amdgpu_irq_handler - IRQ handler
179 * @irq: IRQ number (unused)
180 * @arg: pointer to DRM device
182 * IRQ handler for amdgpu driver (all ASICs).
185 * result of handling the IRQ, as defined by &irqreturn_t
187 irqreturn_t amdgpu_irq_handler(int irq, void *arg)
189 struct drm_device *dev = (struct drm_device *) arg;
190 struct amdgpu_device *adev = drm_to_adev(dev);
193 ret = amdgpu_ih_process(adev, &adev->irq.ih);
194 if (ret == IRQ_HANDLED)
195 pm_runtime_mark_last_busy(dev->dev);
197 /* For the hardware that cannot enable bif ring for both ras_controller_irq
198 * and ras_err_evnet_athub_irq ih cookies, the driver has to poll status
199 * register to check whether the interrupt is triggered or not, and properly
200 * ack the interrupt if it is there
202 if (amdgpu_ras_is_supported(adev, AMDGPU_RAS_BLOCK__PCIE_BIF)) {
203 if (adev->nbio.ras_funcs &&
204 adev->nbio.ras_funcs->handle_ras_controller_intr_no_bifring)
205 adev->nbio.ras_funcs->handle_ras_controller_intr_no_bifring(adev);
207 if (adev->nbio.ras_funcs &&
208 adev->nbio.ras_funcs->handle_ras_err_event_athub_intr_no_bifring)
209 adev->nbio.ras_funcs->handle_ras_err_event_athub_intr_no_bifring(adev);
216 * amdgpu_irq_handle_ih1 - kick of processing for IH1
218 * @work: work structure in struct amdgpu_irq
220 * Kick of processing IH ring 1.
222 static void amdgpu_irq_handle_ih1(struct work_struct *work)
224 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
227 amdgpu_ih_process(adev, &adev->irq.ih1);
231 * amdgpu_irq_handle_ih2 - kick of processing for IH2
233 * @work: work structure in struct amdgpu_irq
235 * Kick of processing IH ring 2.
237 static void amdgpu_irq_handle_ih2(struct work_struct *work)
239 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
242 amdgpu_ih_process(adev, &adev->irq.ih2);
246 * amdgpu_irq_handle_ih_soft - kick of processing for ih_soft
248 * @work: work structure in struct amdgpu_irq
250 * Kick of processing IH soft ring.
252 static void amdgpu_irq_handle_ih_soft(struct work_struct *work)
254 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
257 amdgpu_ih_process(adev, &adev->irq.ih_soft);
261 * amdgpu_msi_ok - check whether MSI functionality is enabled
263 * @adev: amdgpu device pointer (unused)
265 * Checks whether MSI functionality has been disabled via module parameter
269 * *true* if MSIs are allowed to be enabled or *false* otherwise
271 static bool amdgpu_msi_ok(struct amdgpu_device *adev)
275 else if (amdgpu_msi == 0)
281 static void amdgpu_restore_msix(struct amdgpu_device *adev)
285 pci_read_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, &ctrl);
286 if (!(ctrl & PCI_MSIX_FLAGS_ENABLE))
290 ctrl &= ~PCI_MSIX_FLAGS_ENABLE;
291 pci_write_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, ctrl);
292 ctrl |= PCI_MSIX_FLAGS_ENABLE;
293 pci_write_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, ctrl);
297 * amdgpu_irq_init - initialize interrupt handling
299 * @adev: amdgpu device pointer
301 * Sets up work functions for hotplug and reset interrupts, enables MSI
302 * functionality, initializes vblank, hotplug and reset interrupt handling.
305 * 0 on success or error code on failure
307 int amdgpu_irq_init(struct amdgpu_device *adev)
311 spin_lock_init(&adev->irq.lock);
313 /* Enable MSI if not disabled by module parameter */
314 adev->irq.msi_enabled = false;
316 if (amdgpu_msi_ok(adev)) {
317 int nvec = pci_msix_vec_count(adev->pdev);
323 flags = PCI_IRQ_MSI | PCI_IRQ_MSIX;
325 /* we only need one vector */
326 nvec = pci_alloc_irq_vectors(adev->pdev, 1, 1, flags);
328 adev->irq.msi_enabled = true;
329 dev_dbg(adev->dev, "using MSI/MSI-X.\n");
333 if (!amdgpu_device_has_dc_support(adev)) {
334 if (!adev->enable_virtual_display)
335 /* Disable vblank IRQs aggressively for power-saving */
336 /* XXX: can this be enabled for DC? */
337 adev_to_drm(adev)->vblank_disable_immediate = true;
339 r = drm_vblank_init(adev_to_drm(adev), adev->mode_info.num_crtc);
344 INIT_WORK(&adev->hotplug_work,
345 amdgpu_hotplug_work_func);
348 INIT_WORK(&adev->irq.ih1_work, amdgpu_irq_handle_ih1);
349 INIT_WORK(&adev->irq.ih2_work, amdgpu_irq_handle_ih2);
350 INIT_WORK(&adev->irq.ih_soft_work, amdgpu_irq_handle_ih_soft);
352 adev->irq.installed = true;
353 /* Use vector 0 for MSI-X */
354 r = drm_irq_install(adev_to_drm(adev), pci_irq_vector(adev->pdev, 0));
356 adev->irq.installed = false;
357 if (!amdgpu_device_has_dc_support(adev))
358 flush_work(&adev->hotplug_work);
361 adev_to_drm(adev)->max_vblank_count = 0x00ffffff;
363 DRM_DEBUG("amdgpu: irq initialized.\n");
368 void amdgpu_irq_fini_hw(struct amdgpu_device *adev)
370 if (adev->irq.installed) {
371 drm_irq_uninstall(&adev->ddev);
372 adev->irq.installed = false;
373 if (adev->irq.msi_enabled)
374 pci_free_irq_vectors(adev->pdev);
376 if (!amdgpu_device_has_dc_support(adev))
377 flush_work(&adev->hotplug_work);
380 amdgpu_ih_ring_fini(adev, &adev->irq.ih_soft);
381 amdgpu_ih_ring_fini(adev, &adev->irq.ih);
382 amdgpu_ih_ring_fini(adev, &adev->irq.ih1);
383 amdgpu_ih_ring_fini(adev, &adev->irq.ih2);
387 * amdgpu_irq_fini - shut down interrupt handling
389 * @adev: amdgpu device pointer
391 * Tears down work functions for hotplug and reset interrupts, disables MSI
392 * functionality, shuts down vblank, hotplug and reset interrupt handling,
393 * turns off interrupts from all sources (all ASICs).
395 void amdgpu_irq_fini_sw(struct amdgpu_device *adev)
399 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
400 if (!adev->irq.client[i].sources)
403 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
404 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
409 kfree(src->enabled_types);
410 src->enabled_types = NULL;
412 kfree(adev->irq.client[i].sources);
413 adev->irq.client[i].sources = NULL;
418 * amdgpu_irq_add_id - register IRQ source
420 * @adev: amdgpu device pointer
421 * @client_id: client id
423 * @source: IRQ source pointer
425 * Registers IRQ source on a client.
428 * 0 on success or error code otherwise
430 int amdgpu_irq_add_id(struct amdgpu_device *adev,
431 unsigned client_id, unsigned src_id,
432 struct amdgpu_irq_src *source)
434 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX)
437 if (src_id >= AMDGPU_MAX_IRQ_SRC_ID)
443 if (!adev->irq.client[client_id].sources) {
444 adev->irq.client[client_id].sources =
445 kcalloc(AMDGPU_MAX_IRQ_SRC_ID,
446 sizeof(struct amdgpu_irq_src *),
448 if (!adev->irq.client[client_id].sources)
452 if (adev->irq.client[client_id].sources[src_id] != NULL)
455 if (source->num_types && !source->enabled_types) {
458 types = kcalloc(source->num_types, sizeof(atomic_t),
463 source->enabled_types = types;
466 adev->irq.client[client_id].sources[src_id] = source;
471 * amdgpu_irq_dispatch - dispatch IRQ to IP blocks
473 * @adev: amdgpu device pointer
474 * @ih: interrupt ring instance
476 * Dispatches IRQ to IP blocks.
478 void amdgpu_irq_dispatch(struct amdgpu_device *adev,
479 struct amdgpu_ih_ring *ih)
481 u32 ring_index = ih->rptr >> 2;
482 struct amdgpu_iv_entry entry;
483 unsigned client_id, src_id;
484 struct amdgpu_irq_src *src;
485 bool handled = false;
489 entry.iv_entry = (const uint32_t *)&ih->ring[ring_index];
490 amdgpu_ih_decode_iv(adev, &entry);
492 trace_amdgpu_iv(ih - &adev->irq.ih, &entry);
494 client_id = entry.client_id;
495 src_id = entry.src_id;
497 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX) {
498 DRM_DEBUG("Invalid client_id in IV: %d\n", client_id);
500 } else if (src_id >= AMDGPU_MAX_IRQ_SRC_ID) {
501 DRM_DEBUG("Invalid src_id in IV: %d\n", src_id);
503 } else if ((client_id == AMDGPU_IRQ_CLIENTID_LEGACY) &&
504 adev->irq.virq[src_id]) {
505 generic_handle_irq(irq_find_mapping(adev->irq.domain, src_id));
507 } else if (!adev->irq.client[client_id].sources) {
508 DRM_DEBUG("Unregistered interrupt client_id: %d src_id: %d\n",
511 } else if ((src = adev->irq.client[client_id].sources[src_id])) {
512 r = src->funcs->process(adev, src, &entry);
514 DRM_ERROR("error processing interrupt (%d)\n", r);
519 DRM_DEBUG("Unhandled interrupt src_id: %d\n", src_id);
522 /* Send it to amdkfd as well if it isn't already handled */
524 amdgpu_amdkfd_interrupt(adev, entry.iv_entry);
528 * amdgpu_irq_delegate - delegate IV to soft IH ring
530 * @adev: amdgpu device pointer
532 * @num_dw: size of IV
534 * Delegate the IV to the soft IH ring and schedule processing of it. Used
535 * if the hardware delegation to IH1 or IH2 doesn't work for some reason.
537 void amdgpu_irq_delegate(struct amdgpu_device *adev,
538 struct amdgpu_iv_entry *entry,
541 amdgpu_ih_ring_write(&adev->irq.ih_soft, entry->iv_entry, num_dw);
542 schedule_work(&adev->irq.ih_soft_work);
546 * amdgpu_irq_update - update hardware interrupt state
548 * @adev: amdgpu device pointer
549 * @src: interrupt source pointer
550 * @type: type of interrupt
552 * Updates interrupt state for the specific source (all ASICs).
554 int amdgpu_irq_update(struct amdgpu_device *adev,
555 struct amdgpu_irq_src *src, unsigned type)
557 unsigned long irqflags;
558 enum amdgpu_interrupt_state state;
561 spin_lock_irqsave(&adev->irq.lock, irqflags);
563 /* We need to determine after taking the lock, otherwise
564 we might disable just enabled interrupts again */
565 if (amdgpu_irq_enabled(adev, src, type))
566 state = AMDGPU_IRQ_STATE_ENABLE;
568 state = AMDGPU_IRQ_STATE_DISABLE;
570 r = src->funcs->set(adev, src, type, state);
571 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
576 * amdgpu_irq_gpu_reset_resume_helper - update interrupt states on all sources
578 * @adev: amdgpu device pointer
580 * Updates state of all types of interrupts on all sources on resume after
583 void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev)
587 if (amdgpu_sriov_vf(adev) || amdgpu_passthrough(adev))
588 amdgpu_restore_msix(adev);
590 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
591 if (!adev->irq.client[i].sources)
594 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
595 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
597 if (!src || !src->funcs || !src->funcs->set)
599 for (k = 0; k < src->num_types; k++)
600 amdgpu_irq_update(adev, src, k);
606 * amdgpu_irq_get - enable interrupt
608 * @adev: amdgpu device pointer
609 * @src: interrupt source pointer
610 * @type: type of interrupt
612 * Enables specified type of interrupt on the specified source (all ASICs).
615 * 0 on success or error code otherwise
617 int amdgpu_irq_get(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
620 if (!adev->irq.installed)
623 if (type >= src->num_types)
626 if (!src->enabled_types || !src->funcs->set)
629 if (atomic_inc_return(&src->enabled_types[type]) == 1)
630 return amdgpu_irq_update(adev, src, type);
636 * amdgpu_irq_put - disable interrupt
638 * @adev: amdgpu device pointer
639 * @src: interrupt source pointer
640 * @type: type of interrupt
642 * Enables specified type of interrupt on the specified source (all ASICs).
645 * 0 on success or error code otherwise
647 int amdgpu_irq_put(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
650 if (!adev->irq.installed)
653 if (type >= src->num_types)
656 if (!src->enabled_types || !src->funcs->set)
659 if (atomic_dec_and_test(&src->enabled_types[type]))
660 return amdgpu_irq_update(adev, src, type);
666 * amdgpu_irq_enabled - check whether interrupt is enabled or not
668 * @adev: amdgpu device pointer
669 * @src: interrupt source pointer
670 * @type: type of interrupt
672 * Checks whether the given type of interrupt is enabled on the given source.
675 * *true* if interrupt is enabled, *false* if interrupt is disabled or on
678 bool amdgpu_irq_enabled(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
681 if (!adev->irq.installed)
684 if (type >= src->num_types)
687 if (!src->enabled_types || !src->funcs->set)
690 return !!atomic_read(&src->enabled_types[type]);
693 /* XXX: Generic IRQ handling */
694 static void amdgpu_irq_mask(struct irq_data *irqd)
699 static void amdgpu_irq_unmask(struct irq_data *irqd)
704 /* amdgpu hardware interrupt chip descriptor */
705 static struct irq_chip amdgpu_irq_chip = {
707 .irq_mask = amdgpu_irq_mask,
708 .irq_unmask = amdgpu_irq_unmask,
712 * amdgpu_irqdomain_map - create mapping between virtual and hardware IRQ numbers
714 * @d: amdgpu IRQ domain pointer (unused)
715 * @irq: virtual IRQ number
716 * @hwirq: hardware irq number
718 * Current implementation assigns simple interrupt handler to the given virtual
722 * 0 on success or error code otherwise
724 static int amdgpu_irqdomain_map(struct irq_domain *d,
725 unsigned int irq, irq_hw_number_t hwirq)
727 if (hwirq >= AMDGPU_MAX_IRQ_SRC_ID)
730 irq_set_chip_and_handler(irq,
731 &amdgpu_irq_chip, handle_simple_irq);
735 /* Implementation of methods for amdgpu IRQ domain */
736 static const struct irq_domain_ops amdgpu_hw_irqdomain_ops = {
737 .map = amdgpu_irqdomain_map,
741 * amdgpu_irq_add_domain - create a linear IRQ domain
743 * @adev: amdgpu device pointer
745 * Creates an IRQ domain for GPU interrupt sources
746 * that may be driven by another driver (e.g., ACP).
749 * 0 on success or error code otherwise
751 int amdgpu_irq_add_domain(struct amdgpu_device *adev)
753 adev->irq.domain = irq_domain_add_linear(NULL, AMDGPU_MAX_IRQ_SRC_ID,
754 &amdgpu_hw_irqdomain_ops, adev);
755 if (!adev->irq.domain) {
756 DRM_ERROR("GPU irq add domain failed\n");
764 * amdgpu_irq_remove_domain - remove the IRQ domain
766 * @adev: amdgpu device pointer
768 * Removes the IRQ domain for GPU interrupt sources
769 * that may be driven by another driver (e.g., ACP).
771 void amdgpu_irq_remove_domain(struct amdgpu_device *adev)
773 if (adev->irq.domain) {
774 irq_domain_remove(adev->irq.domain);
775 adev->irq.domain = NULL;
780 * amdgpu_irq_create_mapping - create mapping between domain Linux IRQs
782 * @adev: amdgpu device pointer
783 * @src_id: IH source id
785 * Creates mapping between a domain IRQ (GPU IH src id) and a Linux IRQ
786 * Use this for components that generate a GPU interrupt, but are driven
787 * by a different driver (e.g., ACP).
792 unsigned amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned src_id)
794 adev->irq.virq[src_id] = irq_create_mapping(adev->irq.domain, src_id);
796 return adev->irq.virq[src_id];