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_irq_disable_all - disable *all* interrupts
106 * @adev: amdgpu device pointer
108 * Disable all types of interrupts from all sources.
110 void amdgpu_irq_disable_all(struct amdgpu_device *adev)
112 unsigned long irqflags;
116 spin_lock_irqsave(&adev->irq.lock, irqflags);
117 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
118 if (!adev->irq.client[i].sources)
121 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
122 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
124 if (!src || !src->funcs->set || !src->num_types)
127 for (k = 0; k < src->num_types; ++k) {
128 atomic_set(&src->enabled_types[k], 0);
129 r = src->funcs->set(adev, src, k,
130 AMDGPU_IRQ_STATE_DISABLE);
132 DRM_ERROR("error disabling interrupt (%d)\n",
137 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
141 * amdgpu_irq_handler - IRQ handler
143 * @irq: IRQ number (unused)
144 * @arg: pointer to DRM device
146 * IRQ handler for amdgpu driver (all ASICs).
149 * result of handling the IRQ, as defined by &irqreturn_t
151 static irqreturn_t amdgpu_irq_handler(int irq, void *arg)
153 struct drm_device *dev = (struct drm_device *) arg;
154 struct amdgpu_device *adev = drm_to_adev(dev);
157 ret = amdgpu_ih_process(adev, &adev->irq.ih);
158 if (ret == IRQ_HANDLED)
159 pm_runtime_mark_last_busy(dev->dev);
161 amdgpu_ras_interrupt_fatal_error_handler(adev);
167 * amdgpu_irq_handle_ih1 - kick of processing for IH1
169 * @work: work structure in struct amdgpu_irq
171 * Kick of processing IH ring 1.
173 static void amdgpu_irq_handle_ih1(struct work_struct *work)
175 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
178 amdgpu_ih_process(adev, &adev->irq.ih1);
182 * amdgpu_irq_handle_ih2 - kick of processing for IH2
184 * @work: work structure in struct amdgpu_irq
186 * Kick of processing IH ring 2.
188 static void amdgpu_irq_handle_ih2(struct work_struct *work)
190 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
193 amdgpu_ih_process(adev, &adev->irq.ih2);
197 * amdgpu_irq_handle_ih_soft - kick of processing for ih_soft
199 * @work: work structure in struct amdgpu_irq
201 * Kick of processing IH soft ring.
203 static void amdgpu_irq_handle_ih_soft(struct work_struct *work)
205 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
208 amdgpu_ih_process(adev, &adev->irq.ih_soft);
212 * amdgpu_msi_ok - check whether MSI functionality is enabled
214 * @adev: amdgpu device pointer (unused)
216 * Checks whether MSI functionality has been disabled via module parameter
220 * *true* if MSIs are allowed to be enabled or *false* otherwise
222 static bool amdgpu_msi_ok(struct amdgpu_device *adev)
226 else if (amdgpu_msi == 0)
232 static void amdgpu_restore_msix(struct amdgpu_device *adev)
236 pci_read_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, &ctrl);
237 if (!(ctrl & PCI_MSIX_FLAGS_ENABLE))
241 ctrl &= ~PCI_MSIX_FLAGS_ENABLE;
242 pci_write_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, ctrl);
243 ctrl |= PCI_MSIX_FLAGS_ENABLE;
244 pci_write_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, ctrl);
248 * amdgpu_irq_init - initialize interrupt handling
250 * @adev: amdgpu device pointer
252 * Sets up work functions for hotplug and reset interrupts, enables MSI
253 * functionality, initializes vblank, hotplug and reset interrupt handling.
256 * 0 on success or error code on failure
258 int amdgpu_irq_init(struct amdgpu_device *adev)
263 spin_lock_init(&adev->irq.lock);
265 /* Enable MSI if not disabled by module parameter */
266 adev->irq.msi_enabled = false;
268 if (amdgpu_msi_ok(adev)) {
269 int nvec = pci_msix_vec_count(adev->pdev);
275 flags = PCI_IRQ_MSI | PCI_IRQ_MSIX;
277 /* we only need one vector */
278 nvec = pci_alloc_irq_vectors(adev->pdev, 1, 1, flags);
280 adev->irq.msi_enabled = true;
281 dev_dbg(adev->dev, "using MSI/MSI-X.\n");
285 INIT_WORK(&adev->irq.ih1_work, amdgpu_irq_handle_ih1);
286 INIT_WORK(&adev->irq.ih2_work, amdgpu_irq_handle_ih2);
287 INIT_WORK(&adev->irq.ih_soft_work, amdgpu_irq_handle_ih_soft);
289 /* Use vector 0 for MSI-X. */
290 r = pci_irq_vector(adev->pdev, 0);
295 /* PCI devices require shared interrupts. */
296 r = request_irq(irq, amdgpu_irq_handler, IRQF_SHARED, adev_to_drm(adev)->driver->name,
300 adev->irq.installed = true;
302 adev_to_drm(adev)->max_vblank_count = 0x00ffffff;
304 DRM_DEBUG("amdgpu: irq initialized.\n");
309 void amdgpu_irq_fini_hw(struct amdgpu_device *adev)
311 if (adev->irq.installed) {
312 free_irq(adev->irq.irq, adev_to_drm(adev));
313 adev->irq.installed = false;
314 if (adev->irq.msi_enabled)
315 pci_free_irq_vectors(adev->pdev);
318 amdgpu_ih_ring_fini(adev, &adev->irq.ih_soft);
319 amdgpu_ih_ring_fini(adev, &adev->irq.ih);
320 amdgpu_ih_ring_fini(adev, &adev->irq.ih1);
321 amdgpu_ih_ring_fini(adev, &adev->irq.ih2);
325 * amdgpu_irq_fini_sw - shut down interrupt handling
327 * @adev: amdgpu device pointer
329 * Tears down work functions for hotplug and reset interrupts, disables MSI
330 * functionality, shuts down vblank, hotplug and reset interrupt handling,
331 * turns off interrupts from all sources (all ASICs).
333 void amdgpu_irq_fini_sw(struct amdgpu_device *adev)
337 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
338 if (!adev->irq.client[i].sources)
341 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
342 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
347 kfree(src->enabled_types);
348 src->enabled_types = NULL;
350 kfree(adev->irq.client[i].sources);
351 adev->irq.client[i].sources = NULL;
356 * amdgpu_irq_add_id - register IRQ source
358 * @adev: amdgpu device pointer
359 * @client_id: client id
361 * @source: IRQ source pointer
363 * Registers IRQ source on a client.
366 * 0 on success or error code otherwise
368 int amdgpu_irq_add_id(struct amdgpu_device *adev,
369 unsigned client_id, unsigned src_id,
370 struct amdgpu_irq_src *source)
372 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX)
375 if (src_id >= AMDGPU_MAX_IRQ_SRC_ID)
381 if (!adev->irq.client[client_id].sources) {
382 adev->irq.client[client_id].sources =
383 kcalloc(AMDGPU_MAX_IRQ_SRC_ID,
384 sizeof(struct amdgpu_irq_src *),
386 if (!adev->irq.client[client_id].sources)
390 if (adev->irq.client[client_id].sources[src_id] != NULL)
393 if (source->num_types && !source->enabled_types) {
396 types = kcalloc(source->num_types, sizeof(atomic_t),
401 source->enabled_types = types;
404 adev->irq.client[client_id].sources[src_id] = source;
409 * amdgpu_irq_dispatch - dispatch IRQ to IP blocks
411 * @adev: amdgpu device pointer
412 * @ih: interrupt ring instance
414 * Dispatches IRQ to IP blocks.
416 void amdgpu_irq_dispatch(struct amdgpu_device *adev,
417 struct amdgpu_ih_ring *ih)
419 u32 ring_index = ih->rptr >> 2;
420 struct amdgpu_iv_entry entry;
421 unsigned client_id, src_id;
422 struct amdgpu_irq_src *src;
423 bool handled = false;
427 entry.iv_entry = (const uint32_t *)&ih->ring[ring_index];
428 amdgpu_ih_decode_iv(adev, &entry);
430 trace_amdgpu_iv(ih - &adev->irq.ih, &entry);
432 client_id = entry.client_id;
433 src_id = entry.src_id;
435 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX) {
436 DRM_DEBUG("Invalid client_id in IV: %d\n", client_id);
438 } else if (src_id >= AMDGPU_MAX_IRQ_SRC_ID) {
439 DRM_DEBUG("Invalid src_id in IV: %d\n", src_id);
441 } else if ((client_id == AMDGPU_IRQ_CLIENTID_LEGACY) &&
442 adev->irq.virq[src_id]) {
443 generic_handle_domain_irq(adev->irq.domain, src_id);
445 } else if (!adev->irq.client[client_id].sources) {
446 DRM_DEBUG("Unregistered interrupt client_id: %d src_id: %d\n",
449 } else if ((src = adev->irq.client[client_id].sources[src_id])) {
450 r = src->funcs->process(adev, src, &entry);
452 DRM_ERROR("error processing interrupt (%d)\n", r);
457 DRM_DEBUG("Unhandled interrupt src_id: %d\n", src_id);
460 /* Send it to amdkfd as well if it isn't already handled */
462 amdgpu_amdkfd_interrupt(adev, entry.iv_entry);
464 if (amdgpu_ih_ts_after(ih->processed_timestamp, entry.timestamp))
465 ih->processed_timestamp = entry.timestamp;
469 * amdgpu_irq_delegate - delegate IV to soft IH ring
471 * @adev: amdgpu device pointer
473 * @num_dw: size of IV
475 * Delegate the IV to the soft IH ring and schedule processing of it. Used
476 * if the hardware delegation to IH1 or IH2 doesn't work for some reason.
478 void amdgpu_irq_delegate(struct amdgpu_device *adev,
479 struct amdgpu_iv_entry *entry,
482 amdgpu_ih_ring_write(&adev->irq.ih_soft, entry->iv_entry, num_dw);
483 schedule_work(&adev->irq.ih_soft_work);
487 * amdgpu_irq_update - update hardware interrupt state
489 * @adev: amdgpu device pointer
490 * @src: interrupt source pointer
491 * @type: type of interrupt
493 * Updates interrupt state for the specific source (all ASICs).
495 int amdgpu_irq_update(struct amdgpu_device *adev,
496 struct amdgpu_irq_src *src, unsigned type)
498 unsigned long irqflags;
499 enum amdgpu_interrupt_state state;
502 spin_lock_irqsave(&adev->irq.lock, irqflags);
504 /* We need to determine after taking the lock, otherwise
505 we might disable just enabled interrupts again */
506 if (amdgpu_irq_enabled(adev, src, type))
507 state = AMDGPU_IRQ_STATE_ENABLE;
509 state = AMDGPU_IRQ_STATE_DISABLE;
511 r = src->funcs->set(adev, src, type, state);
512 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
517 * amdgpu_irq_gpu_reset_resume_helper - update interrupt states on all sources
519 * @adev: amdgpu device pointer
521 * Updates state of all types of interrupts on all sources on resume after
524 void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev)
528 if (amdgpu_sriov_vf(adev) || amdgpu_passthrough(adev))
529 amdgpu_restore_msix(adev);
531 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
532 if (!adev->irq.client[i].sources)
535 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
536 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
538 if (!src || !src->funcs || !src->funcs->set)
540 for (k = 0; k < src->num_types; k++)
541 amdgpu_irq_update(adev, src, k);
547 * amdgpu_irq_get - enable interrupt
549 * @adev: amdgpu device pointer
550 * @src: interrupt source pointer
551 * @type: type of interrupt
553 * Enables specified type of interrupt on the specified source (all ASICs).
556 * 0 on success or error code otherwise
558 int amdgpu_irq_get(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
561 if (!adev->irq.installed)
564 if (type >= src->num_types)
567 if (!src->enabled_types || !src->funcs->set)
570 if (atomic_inc_return(&src->enabled_types[type]) == 1)
571 return amdgpu_irq_update(adev, src, type);
577 * amdgpu_irq_put - disable interrupt
579 * @adev: amdgpu device pointer
580 * @src: interrupt source pointer
581 * @type: type of interrupt
583 * Enables specified type of interrupt on the specified source (all ASICs).
586 * 0 on success or error code otherwise
588 int amdgpu_irq_put(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
591 if (!adev->irq.installed)
594 if (type >= src->num_types)
597 if (!src->enabled_types || !src->funcs->set)
600 if (atomic_dec_and_test(&src->enabled_types[type]))
601 return amdgpu_irq_update(adev, src, type);
607 * amdgpu_irq_enabled - check whether interrupt is enabled or not
609 * @adev: amdgpu device pointer
610 * @src: interrupt source pointer
611 * @type: type of interrupt
613 * Checks whether the given type of interrupt is enabled on the given source.
616 * *true* if interrupt is enabled, *false* if interrupt is disabled or on
619 bool amdgpu_irq_enabled(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
622 if (!adev->irq.installed)
625 if (type >= src->num_types)
628 if (!src->enabled_types || !src->funcs->set)
631 return !!atomic_read(&src->enabled_types[type]);
634 /* XXX: Generic IRQ handling */
635 static void amdgpu_irq_mask(struct irq_data *irqd)
640 static void amdgpu_irq_unmask(struct irq_data *irqd)
645 /* amdgpu hardware interrupt chip descriptor */
646 static struct irq_chip amdgpu_irq_chip = {
648 .irq_mask = amdgpu_irq_mask,
649 .irq_unmask = amdgpu_irq_unmask,
653 * amdgpu_irqdomain_map - create mapping between virtual and hardware IRQ numbers
655 * @d: amdgpu IRQ domain pointer (unused)
656 * @irq: virtual IRQ number
657 * @hwirq: hardware irq number
659 * Current implementation assigns simple interrupt handler to the given virtual
663 * 0 on success or error code otherwise
665 static int amdgpu_irqdomain_map(struct irq_domain *d,
666 unsigned int irq, irq_hw_number_t hwirq)
668 if (hwirq >= AMDGPU_MAX_IRQ_SRC_ID)
671 irq_set_chip_and_handler(irq,
672 &amdgpu_irq_chip, handle_simple_irq);
676 /* Implementation of methods for amdgpu IRQ domain */
677 static const struct irq_domain_ops amdgpu_hw_irqdomain_ops = {
678 .map = amdgpu_irqdomain_map,
682 * amdgpu_irq_add_domain - create a linear IRQ domain
684 * @adev: amdgpu device pointer
686 * Creates an IRQ domain for GPU interrupt sources
687 * that may be driven by another driver (e.g., ACP).
690 * 0 on success or error code otherwise
692 int amdgpu_irq_add_domain(struct amdgpu_device *adev)
694 adev->irq.domain = irq_domain_add_linear(NULL, AMDGPU_MAX_IRQ_SRC_ID,
695 &amdgpu_hw_irqdomain_ops, adev);
696 if (!adev->irq.domain) {
697 DRM_ERROR("GPU irq add domain failed\n");
705 * amdgpu_irq_remove_domain - remove the IRQ domain
707 * @adev: amdgpu device pointer
709 * Removes the IRQ domain for GPU interrupt sources
710 * that may be driven by another driver (e.g., ACP).
712 void amdgpu_irq_remove_domain(struct amdgpu_device *adev)
714 if (adev->irq.domain) {
715 irq_domain_remove(adev->irq.domain);
716 adev->irq.domain = NULL;
721 * amdgpu_irq_create_mapping - create mapping between domain Linux IRQs
723 * @adev: amdgpu device pointer
724 * @src_id: IH source id
726 * Creates mapping between a domain IRQ (GPU IH src id) and a Linux IRQ
727 * Use this for components that generate a GPU interrupt, but are driven
728 * by a different driver (e.g., ACP).
733 unsigned amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned src_id)
735 adev->irq.virq[src_id] = irq_create_mapping(adev->irq.domain, src_id);
737 return adev->irq.virq[src_id];