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] = {
114 * amdgpu_irq_disable_all - disable *all* interrupts
116 * @adev: amdgpu device pointer
118 * Disable all types of interrupts from all sources.
120 void amdgpu_irq_disable_all(struct amdgpu_device *adev)
122 unsigned long irqflags;
126 spin_lock_irqsave(&adev->irq.lock, irqflags);
127 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
128 if (!adev->irq.client[i].sources)
131 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
132 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
134 if (!src || !src->funcs->set || !src->num_types)
137 for (k = 0; k < src->num_types; ++k) {
138 atomic_set(&src->enabled_types[k], 0);
139 r = src->funcs->set(adev, src, k,
140 AMDGPU_IRQ_STATE_DISABLE);
142 DRM_ERROR("error disabling interrupt (%d)\n",
147 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
151 * amdgpu_irq_handler - IRQ handler
153 * @irq: IRQ number (unused)
154 * @arg: pointer to DRM device
156 * IRQ handler for amdgpu driver (all ASICs).
159 * result of handling the IRQ, as defined by &irqreturn_t
161 static irqreturn_t amdgpu_irq_handler(int irq, void *arg)
163 struct drm_device *dev = (struct drm_device *) arg;
164 struct amdgpu_device *adev = drm_to_adev(dev);
167 ret = amdgpu_ih_process(adev, &adev->irq.ih);
168 if (ret == IRQ_HANDLED)
169 pm_runtime_mark_last_busy(dev->dev);
171 amdgpu_ras_interrupt_fatal_error_handler(adev);
177 * amdgpu_irq_handle_ih1 - kick of processing for IH1
179 * @work: work structure in struct amdgpu_irq
181 * Kick of processing IH ring 1.
183 static void amdgpu_irq_handle_ih1(struct work_struct *work)
185 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
188 amdgpu_ih_process(adev, &adev->irq.ih1);
192 * amdgpu_irq_handle_ih2 - kick of processing for IH2
194 * @work: work structure in struct amdgpu_irq
196 * Kick of processing IH ring 2.
198 static void amdgpu_irq_handle_ih2(struct work_struct *work)
200 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
203 amdgpu_ih_process(adev, &adev->irq.ih2);
207 * amdgpu_irq_handle_ih_soft - kick of processing for ih_soft
209 * @work: work structure in struct amdgpu_irq
211 * Kick of processing IH soft ring.
213 static void amdgpu_irq_handle_ih_soft(struct work_struct *work)
215 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
218 amdgpu_ih_process(adev, &adev->irq.ih_soft);
222 * amdgpu_msi_ok - check whether MSI functionality is enabled
224 * @adev: amdgpu device pointer (unused)
226 * Checks whether MSI functionality has been disabled via module parameter
230 * *true* if MSIs are allowed to be enabled or *false* otherwise
232 static bool amdgpu_msi_ok(struct amdgpu_device *adev)
236 else if (amdgpu_msi == 0)
242 static void amdgpu_restore_msix(struct amdgpu_device *adev)
246 pci_read_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, &ctrl);
247 if (!(ctrl & PCI_MSIX_FLAGS_ENABLE))
251 ctrl &= ~PCI_MSIX_FLAGS_ENABLE;
252 pci_write_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, ctrl);
253 ctrl |= PCI_MSIX_FLAGS_ENABLE;
254 pci_write_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, ctrl);
258 * amdgpu_irq_init - initialize interrupt handling
260 * @adev: amdgpu device pointer
262 * Sets up work functions for hotplug and reset interrupts, enables MSI
263 * functionality, initializes vblank, hotplug and reset interrupt handling.
266 * 0 on success or error code on failure
268 int amdgpu_irq_init(struct amdgpu_device *adev)
273 spin_lock_init(&adev->irq.lock);
275 /* Enable MSI if not disabled by module parameter */
276 adev->irq.msi_enabled = false;
278 if (amdgpu_msi_ok(adev)) {
279 int nvec = pci_msix_vec_count(adev->pdev);
285 flags = PCI_IRQ_MSI | PCI_IRQ_MSIX;
287 /* we only need one vector */
288 nvec = pci_alloc_irq_vectors(adev->pdev, 1, 1, flags);
290 adev->irq.msi_enabled = true;
291 dev_dbg(adev->dev, "using MSI/MSI-X.\n");
295 INIT_WORK(&adev->irq.ih1_work, amdgpu_irq_handle_ih1);
296 INIT_WORK(&adev->irq.ih2_work, amdgpu_irq_handle_ih2);
297 INIT_WORK(&adev->irq.ih_soft_work, amdgpu_irq_handle_ih_soft);
299 /* Use vector 0 for MSI-X. */
300 r = pci_irq_vector(adev->pdev, 0);
305 /* PCI devices require shared interrupts. */
306 r = request_irq(irq, amdgpu_irq_handler, IRQF_SHARED, adev_to_drm(adev)->driver->name,
310 adev->irq.installed = true;
312 adev_to_drm(adev)->max_vblank_count = 0x00ffffff;
314 DRM_DEBUG("amdgpu: irq initialized.\n");
319 void amdgpu_irq_fini_hw(struct amdgpu_device *adev)
321 if (adev->irq.installed) {
322 free_irq(adev->irq.irq, adev_to_drm(adev));
323 adev->irq.installed = false;
324 if (adev->irq.msi_enabled)
325 pci_free_irq_vectors(adev->pdev);
328 amdgpu_ih_ring_fini(adev, &adev->irq.ih_soft);
329 amdgpu_ih_ring_fini(adev, &adev->irq.ih);
330 amdgpu_ih_ring_fini(adev, &adev->irq.ih1);
331 amdgpu_ih_ring_fini(adev, &adev->irq.ih2);
335 * amdgpu_irq_fini_sw - shut down interrupt handling
337 * @adev: amdgpu device pointer
339 * Tears down work functions for hotplug and reset interrupts, disables MSI
340 * functionality, shuts down vblank, hotplug and reset interrupt handling,
341 * turns off interrupts from all sources (all ASICs).
343 void amdgpu_irq_fini_sw(struct amdgpu_device *adev)
347 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
348 if (!adev->irq.client[i].sources)
351 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
352 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
357 kfree(src->enabled_types);
358 src->enabled_types = NULL;
360 kfree(adev->irq.client[i].sources);
361 adev->irq.client[i].sources = NULL;
366 * amdgpu_irq_add_id - register IRQ source
368 * @adev: amdgpu device pointer
369 * @client_id: client id
371 * @source: IRQ source pointer
373 * Registers IRQ source on a client.
376 * 0 on success or error code otherwise
378 int amdgpu_irq_add_id(struct amdgpu_device *adev,
379 unsigned client_id, unsigned src_id,
380 struct amdgpu_irq_src *source)
382 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX)
385 if (src_id >= AMDGPU_MAX_IRQ_SRC_ID)
391 if (!adev->irq.client[client_id].sources) {
392 adev->irq.client[client_id].sources =
393 kcalloc(AMDGPU_MAX_IRQ_SRC_ID,
394 sizeof(struct amdgpu_irq_src *),
396 if (!adev->irq.client[client_id].sources)
400 if (adev->irq.client[client_id].sources[src_id] != NULL)
403 if (source->num_types && !source->enabled_types) {
406 types = kcalloc(source->num_types, sizeof(atomic_t),
411 source->enabled_types = types;
414 adev->irq.client[client_id].sources[src_id] = source;
419 * amdgpu_irq_dispatch - dispatch IRQ to IP blocks
421 * @adev: amdgpu device pointer
422 * @ih: interrupt ring instance
424 * Dispatches IRQ to IP blocks.
426 void amdgpu_irq_dispatch(struct amdgpu_device *adev,
427 struct amdgpu_ih_ring *ih)
429 u32 ring_index = ih->rptr >> 2;
430 struct amdgpu_iv_entry entry;
431 unsigned client_id, src_id;
432 struct amdgpu_irq_src *src;
433 bool handled = false;
437 entry.iv_entry = (const uint32_t *)&ih->ring[ring_index];
438 amdgpu_ih_decode_iv(adev, &entry);
440 trace_amdgpu_iv(ih - &adev->irq.ih, &entry);
442 client_id = entry.client_id;
443 src_id = entry.src_id;
445 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX) {
446 DRM_DEBUG("Invalid client_id in IV: %d\n", client_id);
448 } else if (src_id >= AMDGPU_MAX_IRQ_SRC_ID) {
449 DRM_DEBUG("Invalid src_id in IV: %d\n", src_id);
451 } else if ((client_id == AMDGPU_IRQ_CLIENTID_LEGACY) &&
452 adev->irq.virq[src_id]) {
453 generic_handle_domain_irq(adev->irq.domain, src_id);
455 } else if (!adev->irq.client[client_id].sources) {
456 DRM_DEBUG("Unregistered interrupt client_id: %d src_id: %d\n",
459 } else if ((src = adev->irq.client[client_id].sources[src_id])) {
460 r = src->funcs->process(adev, src, &entry);
462 DRM_ERROR("error processing interrupt (%d)\n", r);
467 DRM_DEBUG("Unhandled interrupt src_id: %d\n", src_id);
470 /* Send it to amdkfd as well if it isn't already handled */
472 amdgpu_amdkfd_interrupt(adev, entry.iv_entry);
474 if (amdgpu_ih_ts_after(ih->processed_timestamp, entry.timestamp))
475 ih->processed_timestamp = entry.timestamp;
479 * amdgpu_irq_delegate - delegate IV to soft IH ring
481 * @adev: amdgpu device pointer
483 * @num_dw: size of IV
485 * Delegate the IV to the soft IH ring and schedule processing of it. Used
486 * if the hardware delegation to IH1 or IH2 doesn't work for some reason.
488 void amdgpu_irq_delegate(struct amdgpu_device *adev,
489 struct amdgpu_iv_entry *entry,
492 amdgpu_ih_ring_write(&adev->irq.ih_soft, entry->iv_entry, num_dw);
493 schedule_work(&adev->irq.ih_soft_work);
497 * amdgpu_irq_update - update hardware interrupt state
499 * @adev: amdgpu device pointer
500 * @src: interrupt source pointer
501 * @type: type of interrupt
503 * Updates interrupt state for the specific source (all ASICs).
505 int amdgpu_irq_update(struct amdgpu_device *adev,
506 struct amdgpu_irq_src *src, unsigned type)
508 unsigned long irqflags;
509 enum amdgpu_interrupt_state state;
512 spin_lock_irqsave(&adev->irq.lock, irqflags);
514 /* We need to determine after taking the lock, otherwise
515 we might disable just enabled interrupts again */
516 if (amdgpu_irq_enabled(adev, src, type))
517 state = AMDGPU_IRQ_STATE_ENABLE;
519 state = AMDGPU_IRQ_STATE_DISABLE;
521 r = src->funcs->set(adev, src, type, state);
522 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
527 * amdgpu_irq_gpu_reset_resume_helper - update interrupt states on all sources
529 * @adev: amdgpu device pointer
531 * Updates state of all types of interrupts on all sources on resume after
534 void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev)
538 if (amdgpu_sriov_vf(adev) || amdgpu_passthrough(adev))
539 amdgpu_restore_msix(adev);
541 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
542 if (!adev->irq.client[i].sources)
545 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
546 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
548 if (!src || !src->funcs || !src->funcs->set)
550 for (k = 0; k < src->num_types; k++)
551 amdgpu_irq_update(adev, src, k);
557 * amdgpu_irq_get - enable interrupt
559 * @adev: amdgpu device pointer
560 * @src: interrupt source pointer
561 * @type: type of interrupt
563 * Enables specified type of interrupt on the specified source (all ASICs).
566 * 0 on success or error code otherwise
568 int amdgpu_irq_get(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
571 if (!adev->irq.installed)
574 if (type >= src->num_types)
577 if (!src->enabled_types || !src->funcs->set)
580 if (atomic_inc_return(&src->enabled_types[type]) == 1)
581 return amdgpu_irq_update(adev, src, type);
587 * amdgpu_irq_put - disable interrupt
589 * @adev: amdgpu device pointer
590 * @src: interrupt source pointer
591 * @type: type of interrupt
593 * Enables specified type of interrupt on the specified source (all ASICs).
596 * 0 on success or error code otherwise
598 int amdgpu_irq_put(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
601 if (!adev->irq.installed)
604 if (type >= src->num_types)
607 if (!src->enabled_types || !src->funcs->set)
610 if (WARN_ON(!amdgpu_irq_enabled(adev, src, type)))
613 if (atomic_dec_and_test(&src->enabled_types[type]))
614 return amdgpu_irq_update(adev, src, type);
620 * amdgpu_irq_enabled - check whether interrupt is enabled or not
622 * @adev: amdgpu device pointer
623 * @src: interrupt source pointer
624 * @type: type of interrupt
626 * Checks whether the given type of interrupt is enabled on the given source.
629 * *true* if interrupt is enabled, *false* if interrupt is disabled or on
632 bool amdgpu_irq_enabled(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
635 if (!adev->irq.installed)
638 if (type >= src->num_types)
641 if (!src->enabled_types || !src->funcs->set)
644 return !!atomic_read(&src->enabled_types[type]);
647 /* XXX: Generic IRQ handling */
648 static void amdgpu_irq_mask(struct irq_data *irqd)
653 static void amdgpu_irq_unmask(struct irq_data *irqd)
658 /* amdgpu hardware interrupt chip descriptor */
659 static struct irq_chip amdgpu_irq_chip = {
661 .irq_mask = amdgpu_irq_mask,
662 .irq_unmask = amdgpu_irq_unmask,
666 * amdgpu_irqdomain_map - create mapping between virtual and hardware IRQ numbers
668 * @d: amdgpu IRQ domain pointer (unused)
669 * @irq: virtual IRQ number
670 * @hwirq: hardware irq number
672 * Current implementation assigns simple interrupt handler to the given virtual
676 * 0 on success or error code otherwise
678 static int amdgpu_irqdomain_map(struct irq_domain *d,
679 unsigned int irq, irq_hw_number_t hwirq)
681 if (hwirq >= AMDGPU_MAX_IRQ_SRC_ID)
684 irq_set_chip_and_handler(irq,
685 &amdgpu_irq_chip, handle_simple_irq);
689 /* Implementation of methods for amdgpu IRQ domain */
690 static const struct irq_domain_ops amdgpu_hw_irqdomain_ops = {
691 .map = amdgpu_irqdomain_map,
695 * amdgpu_irq_add_domain - create a linear IRQ domain
697 * @adev: amdgpu device pointer
699 * Creates an IRQ domain for GPU interrupt sources
700 * that may be driven by another driver (e.g., ACP).
703 * 0 on success or error code otherwise
705 int amdgpu_irq_add_domain(struct amdgpu_device *adev)
707 adev->irq.domain = irq_domain_add_linear(NULL, AMDGPU_MAX_IRQ_SRC_ID,
708 &amdgpu_hw_irqdomain_ops, adev);
709 if (!adev->irq.domain) {
710 DRM_ERROR("GPU irq add domain failed\n");
718 * amdgpu_irq_remove_domain - remove the IRQ domain
720 * @adev: amdgpu device pointer
722 * Removes the IRQ domain for GPU interrupt sources
723 * that may be driven by another driver (e.g., ACP).
725 void amdgpu_irq_remove_domain(struct amdgpu_device *adev)
727 if (adev->irq.domain) {
728 irq_domain_remove(adev->irq.domain);
729 adev->irq.domain = NULL;
734 * amdgpu_irq_create_mapping - create mapping between domain Linux IRQs
736 * @adev: amdgpu device pointer
737 * @src_id: IH source id
739 * Creates mapping between a domain IRQ (GPU IH src id) and a Linux IRQ
740 * Use this for components that generate a GPU interrupt, but are driven
741 * by a different driver (e.g., ACP).
746 unsigned amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned src_id)
748 adev->irq.virq[src_id] = irq_create_mapping(adev->irq.domain, src_id);
750 return adev->irq.virq[src_id];