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_callback - callback from the IH ring
136 * @adev: amdgpu device pointer
137 * @ih: amdgpu ih ring
139 * Callback from IH ring processing to handle the entry at the current position
140 * and advance the read pointer.
142 static void amdgpu_irq_callback(struct amdgpu_device *adev,
143 struct amdgpu_ih_ring *ih)
145 u32 ring_index = ih->rptr >> 2;
146 struct amdgpu_iv_entry entry;
148 entry.iv_entry = (const uint32_t *)&ih->ring[ring_index];
149 amdgpu_ih_decode_iv(adev, &entry);
151 trace_amdgpu_iv(ih - &adev->irq.ih, &entry);
153 amdgpu_irq_dispatch(adev, &entry);
157 * amdgpu_irq_handler - IRQ handler
159 * @irq: IRQ number (unused)
160 * @arg: pointer to DRM device
162 * IRQ handler for amdgpu driver (all ASICs).
165 * result of handling the IRQ, as defined by &irqreturn_t
167 irqreturn_t amdgpu_irq_handler(int irq, void *arg)
169 struct drm_device *dev = (struct drm_device *) arg;
170 struct amdgpu_device *adev = dev->dev_private;
173 ret = amdgpu_ih_process(adev, &adev->irq.ih, amdgpu_irq_callback);
174 if (ret == IRQ_HANDLED)
175 pm_runtime_mark_last_busy(dev->dev);
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, amdgpu_irq_callback);
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, amdgpu_irq_callback);
210 * amdgpu_msi_ok - check whether MSI functionality is enabled
212 * @adev: amdgpu device pointer (unused)
214 * Checks whether MSI functionality has been disabled via module parameter
218 * *true* if MSIs are allowed to be enabled or *false* otherwise
220 static bool amdgpu_msi_ok(struct amdgpu_device *adev)
224 else if (amdgpu_msi == 0)
231 * amdgpu_irq_init - initialize interrupt handling
233 * @adev: amdgpu device pointer
235 * Sets up work functions for hotplug and reset interrupts, enables MSI
236 * functionality, initializes vblank, hotplug and reset interrupt handling.
239 * 0 on success or error code on failure
241 int amdgpu_irq_init(struct amdgpu_device *adev)
245 spin_lock_init(&adev->irq.lock);
247 /* Enable MSI if not disabled by module parameter */
248 adev->irq.msi_enabled = false;
250 if (amdgpu_msi_ok(adev)) {
251 int ret = pci_enable_msi(adev->pdev);
253 adev->irq.msi_enabled = true;
254 dev_dbg(adev->dev, "amdgpu: using MSI.\n");
258 if (!amdgpu_device_has_dc_support(adev)) {
259 if (!adev->enable_virtual_display)
260 /* Disable vblank IRQs aggressively for power-saving */
261 /* XXX: can this be enabled for DC? */
262 adev->ddev->vblank_disable_immediate = true;
264 r = drm_vblank_init(adev->ddev, adev->mode_info.num_crtc);
269 INIT_WORK(&adev->hotplug_work,
270 amdgpu_hotplug_work_func);
273 INIT_WORK(&adev->irq.ih1_work, amdgpu_irq_handle_ih1);
274 INIT_WORK(&adev->irq.ih2_work, amdgpu_irq_handle_ih2);
276 adev->irq.installed = true;
277 r = drm_irq_install(adev->ddev, adev->ddev->pdev->irq);
279 adev->irq.installed = false;
280 if (!amdgpu_device_has_dc_support(adev))
281 flush_work(&adev->hotplug_work);
284 adev->ddev->max_vblank_count = 0x00ffffff;
286 DRM_DEBUG("amdgpu: irq initialized.\n");
291 * amdgpu_irq_fini - shut down interrupt handling
293 * @adev: amdgpu device pointer
295 * Tears down work functions for hotplug and reset interrupts, disables MSI
296 * functionality, shuts down vblank, hotplug and reset interrupt handling,
297 * turns off interrupts from all sources (all ASICs).
299 void amdgpu_irq_fini(struct amdgpu_device *adev)
303 if (adev->irq.installed) {
304 drm_irq_uninstall(adev->ddev);
305 adev->irq.installed = false;
306 if (adev->irq.msi_enabled)
307 pci_disable_msi(adev->pdev);
308 if (!amdgpu_device_has_dc_support(adev))
309 flush_work(&adev->hotplug_work);
312 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
313 if (!adev->irq.client[i].sources)
316 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
317 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
322 kfree(src->enabled_types);
323 src->enabled_types = NULL;
327 adev->irq.client[i].sources[j] = NULL;
330 kfree(adev->irq.client[i].sources);
331 adev->irq.client[i].sources = NULL;
336 * amdgpu_irq_add_id - register IRQ source
338 * @adev: amdgpu device pointer
339 * @client_id: client id
341 * @source: IRQ source pointer
343 * Registers IRQ source on a client.
346 * 0 on success or error code otherwise
348 int amdgpu_irq_add_id(struct amdgpu_device *adev,
349 unsigned client_id, unsigned src_id,
350 struct amdgpu_irq_src *source)
352 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX)
355 if (src_id >= AMDGPU_MAX_IRQ_SRC_ID)
361 if (!adev->irq.client[client_id].sources) {
362 adev->irq.client[client_id].sources =
363 kcalloc(AMDGPU_MAX_IRQ_SRC_ID,
364 sizeof(struct amdgpu_irq_src *),
366 if (!adev->irq.client[client_id].sources)
370 if (adev->irq.client[client_id].sources[src_id] != NULL)
373 if (source->num_types && !source->enabled_types) {
376 types = kcalloc(source->num_types, sizeof(atomic_t),
381 source->enabled_types = types;
384 adev->irq.client[client_id].sources[src_id] = source;
389 * amdgpu_irq_dispatch - dispatch IRQ to IP blocks
391 * @adev: amdgpu device pointer
392 * @entry: interrupt vector pointer
394 * Dispatches IRQ to IP blocks.
396 void amdgpu_irq_dispatch(struct amdgpu_device *adev,
397 struct amdgpu_iv_entry *entry)
399 unsigned client_id = entry->client_id;
400 unsigned src_id = entry->src_id;
401 struct amdgpu_irq_src *src;
402 bool handled = false;
405 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX) {
406 DRM_DEBUG("Invalid client_id in IV: %d\n", client_id);
408 } else if (src_id >= AMDGPU_MAX_IRQ_SRC_ID) {
409 DRM_DEBUG("Invalid src_id in IV: %d\n", src_id);
411 } else if (adev->irq.virq[src_id]) {
412 generic_handle_irq(irq_find_mapping(adev->irq.domain, src_id));
414 } else if (!adev->irq.client[client_id].sources) {
415 DRM_DEBUG("Unregistered interrupt client_id: %d src_id: %d\n",
418 } else if ((src = adev->irq.client[client_id].sources[src_id])) {
419 r = src->funcs->process(adev, src, entry);
421 DRM_ERROR("error processing interrupt (%d)\n", r);
426 DRM_DEBUG("Unhandled interrupt src_id: %d\n", src_id);
429 /* Send it to amdkfd as well if it isn't already handled */
431 amdgpu_amdkfd_interrupt(adev, entry->iv_entry);
435 * amdgpu_irq_update - update hardware interrupt state
437 * @adev: amdgpu device pointer
438 * @src: interrupt source pointer
439 * @type: type of interrupt
441 * Updates interrupt state for the specific source (all ASICs).
443 int amdgpu_irq_update(struct amdgpu_device *adev,
444 struct amdgpu_irq_src *src, unsigned type)
446 unsigned long irqflags;
447 enum amdgpu_interrupt_state state;
450 spin_lock_irqsave(&adev->irq.lock, irqflags);
452 /* We need to determine after taking the lock, otherwise
453 we might disable just enabled interrupts again */
454 if (amdgpu_irq_enabled(adev, src, type))
455 state = AMDGPU_IRQ_STATE_ENABLE;
457 state = AMDGPU_IRQ_STATE_DISABLE;
459 r = src->funcs->set(adev, src, type, state);
460 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
465 * amdgpu_irq_gpu_reset_resume_helper - update interrupt states on all sources
467 * @adev: amdgpu device pointer
469 * Updates state of all types of interrupts on all sources on resume after
472 void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev)
476 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
477 if (!adev->irq.client[i].sources)
480 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
481 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
485 for (k = 0; k < src->num_types; k++)
486 amdgpu_irq_update(adev, src, k);
492 * amdgpu_irq_get - enable interrupt
494 * @adev: amdgpu device pointer
495 * @src: interrupt source pointer
496 * @type: type of interrupt
498 * Enables specified type of interrupt on the specified source (all ASICs).
501 * 0 on success or error code otherwise
503 int amdgpu_irq_get(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
506 if (!adev->ddev->irq_enabled)
509 if (type >= src->num_types)
512 if (!src->enabled_types || !src->funcs->set)
515 if (atomic_inc_return(&src->enabled_types[type]) == 1)
516 return amdgpu_irq_update(adev, src, type);
522 * amdgpu_irq_put - disable interrupt
524 * @adev: amdgpu device pointer
525 * @src: interrupt source pointer
526 * @type: type of interrupt
528 * Enables specified type of interrupt on the specified source (all ASICs).
531 * 0 on success or error code otherwise
533 int amdgpu_irq_put(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
536 if (!adev->ddev->irq_enabled)
539 if (type >= src->num_types)
542 if (!src->enabled_types || !src->funcs->set)
545 if (atomic_dec_and_test(&src->enabled_types[type]))
546 return amdgpu_irq_update(adev, src, type);
552 * amdgpu_irq_enabled - check whether interrupt is enabled or not
554 * @adev: amdgpu device pointer
555 * @src: interrupt source pointer
556 * @type: type of interrupt
558 * Checks whether the given type of interrupt is enabled on the given source.
561 * *true* if interrupt is enabled, *false* if interrupt is disabled or on
564 bool amdgpu_irq_enabled(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
567 if (!adev->ddev->irq_enabled)
570 if (type >= src->num_types)
573 if (!src->enabled_types || !src->funcs->set)
576 return !!atomic_read(&src->enabled_types[type]);
579 /* XXX: Generic IRQ handling */
580 static void amdgpu_irq_mask(struct irq_data *irqd)
585 static void amdgpu_irq_unmask(struct irq_data *irqd)
590 /* amdgpu hardware interrupt chip descriptor */
591 static struct irq_chip amdgpu_irq_chip = {
593 .irq_mask = amdgpu_irq_mask,
594 .irq_unmask = amdgpu_irq_unmask,
598 * amdgpu_irqdomain_map - create mapping between virtual and hardware IRQ numbers
600 * @d: amdgpu IRQ domain pointer (unused)
601 * @irq: virtual IRQ number
602 * @hwirq: hardware irq number
604 * Current implementation assigns simple interrupt handler to the given virtual
608 * 0 on success or error code otherwise
610 static int amdgpu_irqdomain_map(struct irq_domain *d,
611 unsigned int irq, irq_hw_number_t hwirq)
613 if (hwirq >= AMDGPU_MAX_IRQ_SRC_ID)
616 irq_set_chip_and_handler(irq,
617 &amdgpu_irq_chip, handle_simple_irq);
621 /* Implementation of methods for amdgpu IRQ domain */
622 static const struct irq_domain_ops amdgpu_hw_irqdomain_ops = {
623 .map = amdgpu_irqdomain_map,
627 * amdgpu_irq_add_domain - create a linear IRQ domain
629 * @adev: amdgpu device pointer
631 * Creates an IRQ domain for GPU interrupt sources
632 * that may be driven by another driver (e.g., ACP).
635 * 0 on success or error code otherwise
637 int amdgpu_irq_add_domain(struct amdgpu_device *adev)
639 adev->irq.domain = irq_domain_add_linear(NULL, AMDGPU_MAX_IRQ_SRC_ID,
640 &amdgpu_hw_irqdomain_ops, adev);
641 if (!adev->irq.domain) {
642 DRM_ERROR("GPU irq add domain failed\n");
650 * amdgpu_irq_remove_domain - remove the IRQ domain
652 * @adev: amdgpu device pointer
654 * Removes the IRQ domain for GPU interrupt sources
655 * that may be driven by another driver (e.g., ACP).
657 void amdgpu_irq_remove_domain(struct amdgpu_device *adev)
659 if (adev->irq.domain) {
660 irq_domain_remove(adev->irq.domain);
661 adev->irq.domain = NULL;
666 * amdgpu_irq_create_mapping - create mapping between domain Linux IRQs
668 * @adev: amdgpu device pointer
669 * @src_id: IH source id
671 * Creates mapping between a domain IRQ (GPU IH src id) and a Linux IRQ
672 * Use this for components that generate a GPU interrupt, but are driven
673 * by a different driver (e.g., ACP).
678 unsigned amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned src_id)
680 adev->irq.virq[src_id] = irq_create_mapping(adev->irq.domain, src_id);
682 return adev->irq.virq[src_id];