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>
47 #include <drm/drm_crtc_helper.h>
48 #include <drm/amdgpu_drm.h>
50 #include "amdgpu_ih.h"
52 #include "amdgpu_connectors.h"
53 #include "amdgpu_trace.h"
54 #include "amdgpu_amdkfd.h"
56 #include <linux/pm_runtime.h>
58 #ifdef CONFIG_DRM_AMD_DC
59 #include "amdgpu_dm_irq.h"
62 #define AMDGPU_WAIT_IDLE_TIMEOUT 200
65 * amdgpu_hotplug_work_func - work handler for display hotplug event
67 * @work: work struct pointer
69 * This is the hotplug event work handler (all ASICs).
70 * The work gets scheduled from the IRQ handler if there
71 * was a hotplug interrupt. It walks through the connector table
72 * and calls hotplug handler for each connector. After this, it sends
73 * a DRM hotplug event to alert userspace.
75 * This design approach is required in order to defer hotplug event handling
76 * from the IRQ handler to a work handler because hotplug handler has to use
77 * mutexes which cannot be locked in an IRQ handler (since &mutex_lock may
80 static void amdgpu_hotplug_work_func(struct work_struct *work)
82 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
84 struct drm_device *dev = adev->ddev;
85 struct drm_mode_config *mode_config = &dev->mode_config;
86 struct drm_connector *connector;
88 mutex_lock(&mode_config->mutex);
89 list_for_each_entry(connector, &mode_config->connector_list, head)
90 amdgpu_connector_hotplug(connector);
91 mutex_unlock(&mode_config->mutex);
92 /* Just fire off a uevent and let userspace tell us what to do */
93 drm_helper_hpd_irq_event(dev);
97 * amdgpu_irq_disable_all - disable *all* interrupts
99 * @adev: amdgpu device pointer
101 * Disable all types of interrupts from all sources.
103 void amdgpu_irq_disable_all(struct amdgpu_device *adev)
105 unsigned long irqflags;
109 spin_lock_irqsave(&adev->irq.lock, irqflags);
110 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
111 if (!adev->irq.client[i].sources)
114 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
115 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
117 if (!src || !src->funcs->set || !src->num_types)
120 for (k = 0; k < src->num_types; ++k) {
121 atomic_set(&src->enabled_types[k], 0);
122 r = src->funcs->set(adev, src, k,
123 AMDGPU_IRQ_STATE_DISABLE);
125 DRM_ERROR("error disabling interrupt (%d)\n",
130 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
134 * amdgpu_irq_handler - IRQ handler
136 * @irq: IRQ number (unused)
137 * @arg: pointer to DRM device
139 * IRQ handler for amdgpu driver (all ASICs).
142 * result of handling the IRQ, as defined by &irqreturn_t
144 irqreturn_t amdgpu_irq_handler(int irq, void *arg)
146 struct drm_device *dev = (struct drm_device *) arg;
147 struct amdgpu_device *adev = dev->dev_private;
150 ret = amdgpu_ih_process(adev, &adev->irq.ih);
151 if (ret == IRQ_HANDLED)
152 pm_runtime_mark_last_busy(dev->dev);
157 * amdgpu_irq_handle_ih1 - kick of processing for IH1
159 * @work: work structure in struct amdgpu_irq
161 * Kick of processing IH ring 1.
163 static void amdgpu_irq_handle_ih1(struct work_struct *work)
165 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
168 amdgpu_ih_process(adev, &adev->irq.ih1);
172 * amdgpu_irq_handle_ih2 - kick of processing for IH2
174 * @work: work structure in struct amdgpu_irq
176 * Kick of processing IH ring 2.
178 static void amdgpu_irq_handle_ih2(struct work_struct *work)
180 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
183 amdgpu_ih_process(adev, &adev->irq.ih2);
187 * amdgpu_msi_ok - check whether MSI functionality is enabled
189 * @adev: amdgpu device pointer (unused)
191 * Checks whether MSI functionality has been disabled via module parameter
195 * *true* if MSIs are allowed to be enabled or *false* otherwise
197 static bool amdgpu_msi_ok(struct amdgpu_device *adev)
201 else if (amdgpu_msi == 0)
208 * amdgpu_irq_init - initialize interrupt handling
210 * @adev: amdgpu device pointer
212 * Sets up work functions for hotplug and reset interrupts, enables MSI
213 * functionality, initializes vblank, hotplug and reset interrupt handling.
216 * 0 on success or error code on failure
218 int amdgpu_irq_init(struct amdgpu_device *adev)
222 spin_lock_init(&adev->irq.lock);
224 /* Enable MSI if not disabled by module parameter */
225 adev->irq.msi_enabled = false;
227 if (amdgpu_msi_ok(adev)) {
228 int ret = pci_enable_msi(adev->pdev);
230 adev->irq.msi_enabled = true;
231 dev_dbg(adev->dev, "amdgpu: using MSI.\n");
235 if (!amdgpu_device_has_dc_support(adev)) {
236 if (!adev->enable_virtual_display)
237 /* Disable vblank IRQs aggressively for power-saving */
238 /* XXX: can this be enabled for DC? */
239 adev->ddev->vblank_disable_immediate = true;
241 r = drm_vblank_init(adev->ddev, adev->mode_info.num_crtc);
246 INIT_WORK(&adev->hotplug_work,
247 amdgpu_hotplug_work_func);
250 INIT_WORK(&adev->irq.ih1_work, amdgpu_irq_handle_ih1);
251 INIT_WORK(&adev->irq.ih2_work, amdgpu_irq_handle_ih2);
253 adev->irq.installed = true;
254 r = drm_irq_install(adev->ddev, adev->ddev->pdev->irq);
256 adev->irq.installed = false;
257 if (!amdgpu_device_has_dc_support(adev))
258 flush_work(&adev->hotplug_work);
261 adev->ddev->max_vblank_count = 0x00ffffff;
263 DRM_DEBUG("amdgpu: irq initialized.\n");
268 * amdgpu_irq_fini - shut down interrupt handling
270 * @adev: amdgpu device pointer
272 * Tears down work functions for hotplug and reset interrupts, disables MSI
273 * functionality, shuts down vblank, hotplug and reset interrupt handling,
274 * turns off interrupts from all sources (all ASICs).
276 void amdgpu_irq_fini(struct amdgpu_device *adev)
280 if (adev->irq.installed) {
281 drm_irq_uninstall(adev->ddev);
282 adev->irq.installed = false;
283 if (adev->irq.msi_enabled)
284 pci_disable_msi(adev->pdev);
285 if (!amdgpu_device_has_dc_support(adev))
286 flush_work(&adev->hotplug_work);
289 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
290 if (!adev->irq.client[i].sources)
293 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
294 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
299 kfree(src->enabled_types);
300 src->enabled_types = NULL;
304 adev->irq.client[i].sources[j] = NULL;
307 kfree(adev->irq.client[i].sources);
308 adev->irq.client[i].sources = NULL;
313 * amdgpu_irq_add_id - register IRQ source
315 * @adev: amdgpu device pointer
316 * @client_id: client id
318 * @source: IRQ source pointer
320 * Registers IRQ source on a client.
323 * 0 on success or error code otherwise
325 int amdgpu_irq_add_id(struct amdgpu_device *adev,
326 unsigned client_id, unsigned src_id,
327 struct amdgpu_irq_src *source)
329 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX)
332 if (src_id >= AMDGPU_MAX_IRQ_SRC_ID)
338 if (!adev->irq.client[client_id].sources) {
339 adev->irq.client[client_id].sources =
340 kcalloc(AMDGPU_MAX_IRQ_SRC_ID,
341 sizeof(struct amdgpu_irq_src *),
343 if (!adev->irq.client[client_id].sources)
347 if (adev->irq.client[client_id].sources[src_id] != NULL)
350 if (source->num_types && !source->enabled_types) {
353 types = kcalloc(source->num_types, sizeof(atomic_t),
358 source->enabled_types = types;
361 adev->irq.client[client_id].sources[src_id] = source;
366 * amdgpu_irq_dispatch - dispatch IRQ to IP blocks
368 * @adev: amdgpu device pointer
369 * @entry: interrupt vector pointer
371 * Dispatches IRQ to IP blocks.
373 void amdgpu_irq_dispatch(struct amdgpu_device *adev,
374 struct amdgpu_ih_ring *ih)
376 u32 ring_index = ih->rptr >> 2;
377 struct amdgpu_iv_entry entry;
378 unsigned client_id, src_id;
379 struct amdgpu_irq_src *src;
380 bool handled = false;
383 entry.iv_entry = (const uint32_t *)&ih->ring[ring_index];
384 amdgpu_ih_decode_iv(adev, &entry);
386 trace_amdgpu_iv(ih - &adev->irq.ih, &entry);
388 client_id = entry.client_id;
389 src_id = entry.src_id;
391 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX) {
392 DRM_DEBUG("Invalid client_id in IV: %d\n", client_id);
394 } else if (src_id >= AMDGPU_MAX_IRQ_SRC_ID) {
395 DRM_DEBUG("Invalid src_id in IV: %d\n", src_id);
397 } else if (adev->irq.virq[src_id]) {
398 generic_handle_irq(irq_find_mapping(adev->irq.domain, src_id));
400 } else if (!adev->irq.client[client_id].sources) {
401 DRM_DEBUG("Unregistered interrupt client_id: %d src_id: %d\n",
404 } else if ((src = adev->irq.client[client_id].sources[src_id])) {
405 r = src->funcs->process(adev, src, &entry);
407 DRM_ERROR("error processing interrupt (%d)\n", r);
412 DRM_DEBUG("Unhandled interrupt src_id: %d\n", src_id);
415 /* Send it to amdkfd as well if it isn't already handled */
417 amdgpu_amdkfd_interrupt(adev, entry.iv_entry);
421 * amdgpu_irq_update - update hardware interrupt state
423 * @adev: amdgpu device pointer
424 * @src: interrupt source pointer
425 * @type: type of interrupt
427 * Updates interrupt state for the specific source (all ASICs).
429 int amdgpu_irq_update(struct amdgpu_device *adev,
430 struct amdgpu_irq_src *src, unsigned type)
432 unsigned long irqflags;
433 enum amdgpu_interrupt_state state;
436 spin_lock_irqsave(&adev->irq.lock, irqflags);
438 /* We need to determine after taking the lock, otherwise
439 we might disable just enabled interrupts again */
440 if (amdgpu_irq_enabled(adev, src, type))
441 state = AMDGPU_IRQ_STATE_ENABLE;
443 state = AMDGPU_IRQ_STATE_DISABLE;
445 r = src->funcs->set(adev, src, type, state);
446 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
451 * amdgpu_irq_gpu_reset_resume_helper - update interrupt states on all sources
453 * @adev: amdgpu device pointer
455 * Updates state of all types of interrupts on all sources on resume after
458 void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev)
462 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
463 if (!adev->irq.client[i].sources)
466 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
467 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
471 for (k = 0; k < src->num_types; k++)
472 amdgpu_irq_update(adev, src, k);
478 * amdgpu_irq_get - enable interrupt
480 * @adev: amdgpu device pointer
481 * @src: interrupt source pointer
482 * @type: type of interrupt
484 * Enables specified type of interrupt on the specified source (all ASICs).
487 * 0 on success or error code otherwise
489 int amdgpu_irq_get(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
492 if (!adev->ddev->irq_enabled)
495 if (type >= src->num_types)
498 if (!src->enabled_types || !src->funcs->set)
501 if (atomic_inc_return(&src->enabled_types[type]) == 1)
502 return amdgpu_irq_update(adev, src, type);
508 * amdgpu_irq_put - disable interrupt
510 * @adev: amdgpu device pointer
511 * @src: interrupt source pointer
512 * @type: type of interrupt
514 * Enables specified type of interrupt on the specified source (all ASICs).
517 * 0 on success or error code otherwise
519 int amdgpu_irq_put(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
522 if (!adev->ddev->irq_enabled)
525 if (type >= src->num_types)
528 if (!src->enabled_types || !src->funcs->set)
531 if (atomic_dec_and_test(&src->enabled_types[type]))
532 return amdgpu_irq_update(adev, src, type);
538 * amdgpu_irq_enabled - check whether interrupt is enabled or not
540 * @adev: amdgpu device pointer
541 * @src: interrupt source pointer
542 * @type: type of interrupt
544 * Checks whether the given type of interrupt is enabled on the given source.
547 * *true* if interrupt is enabled, *false* if interrupt is disabled or on
550 bool amdgpu_irq_enabled(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
553 if (!adev->ddev->irq_enabled)
556 if (type >= src->num_types)
559 if (!src->enabled_types || !src->funcs->set)
562 return !!atomic_read(&src->enabled_types[type]);
565 /* XXX: Generic IRQ handling */
566 static void amdgpu_irq_mask(struct irq_data *irqd)
571 static void amdgpu_irq_unmask(struct irq_data *irqd)
576 /* amdgpu hardware interrupt chip descriptor */
577 static struct irq_chip amdgpu_irq_chip = {
579 .irq_mask = amdgpu_irq_mask,
580 .irq_unmask = amdgpu_irq_unmask,
584 * amdgpu_irqdomain_map - create mapping between virtual and hardware IRQ numbers
586 * @d: amdgpu IRQ domain pointer (unused)
587 * @irq: virtual IRQ number
588 * @hwirq: hardware irq number
590 * Current implementation assigns simple interrupt handler to the given virtual
594 * 0 on success or error code otherwise
596 static int amdgpu_irqdomain_map(struct irq_domain *d,
597 unsigned int irq, irq_hw_number_t hwirq)
599 if (hwirq >= AMDGPU_MAX_IRQ_SRC_ID)
602 irq_set_chip_and_handler(irq,
603 &amdgpu_irq_chip, handle_simple_irq);
607 /* Implementation of methods for amdgpu IRQ domain */
608 static const struct irq_domain_ops amdgpu_hw_irqdomain_ops = {
609 .map = amdgpu_irqdomain_map,
613 * amdgpu_irq_add_domain - create a linear IRQ domain
615 * @adev: amdgpu device pointer
617 * Creates an IRQ domain for GPU interrupt sources
618 * that may be driven by another driver (e.g., ACP).
621 * 0 on success or error code otherwise
623 int amdgpu_irq_add_domain(struct amdgpu_device *adev)
625 adev->irq.domain = irq_domain_add_linear(NULL, AMDGPU_MAX_IRQ_SRC_ID,
626 &amdgpu_hw_irqdomain_ops, adev);
627 if (!adev->irq.domain) {
628 DRM_ERROR("GPU irq add domain failed\n");
636 * amdgpu_irq_remove_domain - remove the IRQ domain
638 * @adev: amdgpu device pointer
640 * Removes the IRQ domain for GPU interrupt sources
641 * that may be driven by another driver (e.g., ACP).
643 void amdgpu_irq_remove_domain(struct amdgpu_device *adev)
645 if (adev->irq.domain) {
646 irq_domain_remove(adev->irq.domain);
647 adev->irq.domain = NULL;
652 * amdgpu_irq_create_mapping - create mapping between domain Linux IRQs
654 * @adev: amdgpu device pointer
655 * @src_id: IH source id
657 * Creates mapping between a domain IRQ (GPU IH src id) and a Linux IRQ
658 * Use this for components that generate a GPU interrupt, but are driven
659 * by a different driver (e.g., ACP).
664 unsigned amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned src_id)
666 adev->irq.virq[src_id] = irq_create_mapping(adev->irq.domain, src_id);
668 return adev->irq.virq[src_id];