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)
273 unsigned int irq, flags;
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 flags = PCI_IRQ_INTX;
284 flags = PCI_IRQ_ALL_TYPES;
286 /* we only need one vector */
287 r = pci_alloc_irq_vectors(adev->pdev, 1, 1, flags);
289 dev_err(adev->dev, "Failed to alloc msi vectors\n");
293 if (amdgpu_msi_ok(adev)) {
294 adev->irq.msi_enabled = true;
295 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,
314 adev->irq.installed = true;
316 adev_to_drm(adev)->max_vblank_count = 0x00ffffff;
318 DRM_DEBUG("amdgpu: irq initialized.\n");
322 if (adev->irq.msi_enabled)
323 pci_free_irq_vectors(adev->pdev);
325 adev->irq.msi_enabled = false;
329 void amdgpu_irq_fini_hw(struct amdgpu_device *adev)
331 if (adev->irq.installed) {
332 free_irq(adev->irq.irq, adev_to_drm(adev));
333 adev->irq.installed = false;
334 if (adev->irq.msi_enabled)
335 pci_free_irq_vectors(adev->pdev);
338 amdgpu_ih_ring_fini(adev, &adev->irq.ih_soft);
339 amdgpu_ih_ring_fini(adev, &adev->irq.ih);
340 amdgpu_ih_ring_fini(adev, &adev->irq.ih1);
341 amdgpu_ih_ring_fini(adev, &adev->irq.ih2);
345 * amdgpu_irq_fini_sw - shut down interrupt handling
347 * @adev: amdgpu device pointer
349 * Tears down work functions for hotplug and reset interrupts, disables MSI
350 * functionality, shuts down vblank, hotplug and reset interrupt handling,
351 * turns off interrupts from all sources (all ASICs).
353 void amdgpu_irq_fini_sw(struct amdgpu_device *adev)
357 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
358 if (!adev->irq.client[i].sources)
361 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
362 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
367 kfree(src->enabled_types);
368 src->enabled_types = NULL;
370 kfree(adev->irq.client[i].sources);
371 adev->irq.client[i].sources = NULL;
376 * amdgpu_irq_add_id - register IRQ source
378 * @adev: amdgpu device pointer
379 * @client_id: client id
381 * @source: IRQ source pointer
383 * Registers IRQ source on a client.
386 * 0 on success or error code otherwise
388 int amdgpu_irq_add_id(struct amdgpu_device *adev,
389 unsigned int client_id, unsigned int src_id,
390 struct amdgpu_irq_src *source)
392 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX)
395 if (src_id >= AMDGPU_MAX_IRQ_SRC_ID)
401 if (!adev->irq.client[client_id].sources) {
402 adev->irq.client[client_id].sources =
403 kcalloc(AMDGPU_MAX_IRQ_SRC_ID,
404 sizeof(struct amdgpu_irq_src *),
406 if (!adev->irq.client[client_id].sources)
410 if (adev->irq.client[client_id].sources[src_id] != NULL)
413 if (source->num_types && !source->enabled_types) {
416 types = kcalloc(source->num_types, sizeof(atomic_t),
421 source->enabled_types = types;
424 adev->irq.client[client_id].sources[src_id] = source;
429 * amdgpu_irq_dispatch - dispatch IRQ to IP blocks
431 * @adev: amdgpu device pointer
432 * @ih: interrupt ring instance
434 * Dispatches IRQ to IP blocks.
436 void amdgpu_irq_dispatch(struct amdgpu_device *adev,
437 struct amdgpu_ih_ring *ih)
439 u32 ring_index = ih->rptr >> 2;
440 struct amdgpu_iv_entry entry;
441 unsigned int client_id, src_id;
442 struct amdgpu_irq_src *src;
443 bool handled = false;
447 entry.iv_entry = (const uint32_t *)&ih->ring[ring_index];
450 * timestamp is not supported on some legacy SOCs (cik, cz, iceland,
451 * si and tonga), so initialize timestamp and timestamp_src to 0
454 entry.timestamp_src = 0;
456 amdgpu_ih_decode_iv(adev, &entry);
458 trace_amdgpu_iv(ih - &adev->irq.ih, &entry);
460 client_id = entry.client_id;
461 src_id = entry.src_id;
463 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX) {
464 DRM_DEBUG("Invalid client_id in IV: %d\n", client_id);
466 } else if (src_id >= AMDGPU_MAX_IRQ_SRC_ID) {
467 DRM_DEBUG("Invalid src_id in IV: %d\n", src_id);
469 } else if (((client_id == AMDGPU_IRQ_CLIENTID_LEGACY) ||
470 (client_id == SOC15_IH_CLIENTID_ISP)) &&
471 adev->irq.virq[src_id]) {
472 generic_handle_domain_irq(adev->irq.domain, src_id);
474 } else if (!adev->irq.client[client_id].sources) {
475 DRM_DEBUG("Unregistered interrupt client_id: %d src_id: %d\n",
478 } else if ((src = adev->irq.client[client_id].sources[src_id])) {
479 r = src->funcs->process(adev, src, &entry);
481 DRM_ERROR("error processing interrupt (%d)\n", r);
486 DRM_DEBUG("Unregistered interrupt src_id: %d of client_id:%d\n",
490 /* Send it to amdkfd as well if it isn't already handled */
492 amdgpu_amdkfd_interrupt(adev, entry.iv_entry);
494 if (amdgpu_ih_ts_after(ih->processed_timestamp, entry.timestamp))
495 ih->processed_timestamp = entry.timestamp;
499 * amdgpu_irq_delegate - delegate IV to soft IH ring
501 * @adev: amdgpu device pointer
503 * @num_dw: size of IV
505 * Delegate the IV to the soft IH ring and schedule processing of it. Used
506 * if the hardware delegation to IH1 or IH2 doesn't work for some reason.
508 void amdgpu_irq_delegate(struct amdgpu_device *adev,
509 struct amdgpu_iv_entry *entry,
512 amdgpu_ih_ring_write(adev, &adev->irq.ih_soft, entry->iv_entry, num_dw);
513 schedule_work(&adev->irq.ih_soft_work);
517 * amdgpu_irq_update - update hardware interrupt state
519 * @adev: amdgpu device pointer
520 * @src: interrupt source pointer
521 * @type: type of interrupt
523 * Updates interrupt state for the specific source (all ASICs).
525 int amdgpu_irq_update(struct amdgpu_device *adev,
526 struct amdgpu_irq_src *src, unsigned int type)
528 unsigned long irqflags;
529 enum amdgpu_interrupt_state state;
532 spin_lock_irqsave(&adev->irq.lock, irqflags);
534 /* We need to determine after taking the lock, otherwise
535 * we might disable just enabled interrupts again
537 if (amdgpu_irq_enabled(adev, src, type))
538 state = AMDGPU_IRQ_STATE_ENABLE;
540 state = AMDGPU_IRQ_STATE_DISABLE;
542 r = src->funcs->set(adev, src, type, state);
543 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
548 * amdgpu_irq_gpu_reset_resume_helper - update interrupt states on all sources
550 * @adev: amdgpu device pointer
552 * Updates state of all types of interrupts on all sources on resume after
555 void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev)
559 if (amdgpu_sriov_vf(adev) || amdgpu_passthrough(adev))
560 amdgpu_restore_msix(adev);
562 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
563 if (!adev->irq.client[i].sources)
566 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
567 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
569 if (!src || !src->funcs || !src->funcs->set)
571 for (k = 0; k < src->num_types; k++)
572 amdgpu_irq_update(adev, src, k);
578 * amdgpu_irq_get - enable interrupt
580 * @adev: amdgpu device pointer
581 * @src: interrupt source pointer
582 * @type: type of interrupt
584 * Enables specified type of interrupt on the specified source (all ASICs).
587 * 0 on success or error code otherwise
589 int amdgpu_irq_get(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
592 if (!adev->irq.installed)
595 if (type >= src->num_types)
598 if (!src->enabled_types || !src->funcs->set)
601 if (atomic_inc_return(&src->enabled_types[type]) == 1)
602 return amdgpu_irq_update(adev, src, type);
608 * amdgpu_irq_put - disable interrupt
610 * @adev: amdgpu device pointer
611 * @src: interrupt source pointer
612 * @type: type of interrupt
614 * Enables specified type of interrupt on the specified source (all ASICs).
617 * 0 on success or error code otherwise
619 int amdgpu_irq_put(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 if (WARN_ON(!amdgpu_irq_enabled(adev, src, type)))
634 if (atomic_dec_and_test(&src->enabled_types[type]))
635 return amdgpu_irq_update(adev, src, type);
641 * amdgpu_irq_enabled - check whether interrupt is enabled or not
643 * @adev: amdgpu device pointer
644 * @src: interrupt source pointer
645 * @type: type of interrupt
647 * Checks whether the given type of interrupt is enabled on the given source.
650 * *true* if interrupt is enabled, *false* if interrupt is disabled or on
653 bool amdgpu_irq_enabled(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
656 if (!adev->irq.installed)
659 if (type >= src->num_types)
662 if (!src->enabled_types || !src->funcs->set)
665 return !!atomic_read(&src->enabled_types[type]);
668 /* XXX: Generic IRQ handling */
669 static void amdgpu_irq_mask(struct irq_data *irqd)
674 static void amdgpu_irq_unmask(struct irq_data *irqd)
679 /* amdgpu hardware interrupt chip descriptor */
680 static struct irq_chip amdgpu_irq_chip = {
682 .irq_mask = amdgpu_irq_mask,
683 .irq_unmask = amdgpu_irq_unmask,
687 * amdgpu_irqdomain_map - create mapping between virtual and hardware IRQ numbers
689 * @d: amdgpu IRQ domain pointer (unused)
690 * @irq: virtual IRQ number
691 * @hwirq: hardware irq number
693 * Current implementation assigns simple interrupt handler to the given virtual
697 * 0 on success or error code otherwise
699 static int amdgpu_irqdomain_map(struct irq_domain *d,
700 unsigned int irq, irq_hw_number_t hwirq)
702 if (hwirq >= AMDGPU_MAX_IRQ_SRC_ID)
705 irq_set_chip_and_handler(irq,
706 &amdgpu_irq_chip, handle_simple_irq);
710 /* Implementation of methods for amdgpu IRQ domain */
711 static const struct irq_domain_ops amdgpu_hw_irqdomain_ops = {
712 .map = amdgpu_irqdomain_map,
716 * amdgpu_irq_add_domain - create a linear IRQ domain
718 * @adev: amdgpu device pointer
720 * Creates an IRQ domain for GPU interrupt sources
721 * that may be driven by another driver (e.g., ACP).
724 * 0 on success or error code otherwise
726 int amdgpu_irq_add_domain(struct amdgpu_device *adev)
728 adev->irq.domain = irq_domain_add_linear(NULL, AMDGPU_MAX_IRQ_SRC_ID,
729 &amdgpu_hw_irqdomain_ops, adev);
730 if (!adev->irq.domain) {
731 DRM_ERROR("GPU irq add domain failed\n");
739 * amdgpu_irq_remove_domain - remove the IRQ domain
741 * @adev: amdgpu device pointer
743 * Removes the IRQ domain for GPU interrupt sources
744 * that may be driven by another driver (e.g., ACP).
746 void amdgpu_irq_remove_domain(struct amdgpu_device *adev)
748 if (adev->irq.domain) {
749 irq_domain_remove(adev->irq.domain);
750 adev->irq.domain = NULL;
755 * amdgpu_irq_create_mapping - create mapping between domain Linux IRQs
757 * @adev: amdgpu device pointer
758 * @src_id: IH source id
760 * Creates mapping between a domain IRQ (GPU IH src id) and a Linux IRQ
761 * Use this for components that generate a GPU interrupt, but are driven
762 * by a different driver (e.g., ACP).
767 unsigned int amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned int src_id)
769 adev->irq.virq[src_id] = irq_create_mapping(adev->irq.domain, src_id);
771 return adev->irq.virq[src_id];