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 /* Prescreening of high-frequency interrupts */
149 if (!amdgpu_ih_prescreen_iv(adev))
152 /* Before dispatching irq to IP blocks, send it to amdkfd */
153 amdgpu_amdkfd_interrupt(adev, (const void *) &ih->ring[ring_index]);
155 entry.iv_entry = (const uint32_t *)&ih->ring[ring_index];
156 amdgpu_ih_decode_iv(adev, &entry);
158 amdgpu_irq_dispatch(adev, &entry);
162 * amdgpu_irq_handler - IRQ handler
164 * @irq: IRQ number (unused)
165 * @arg: pointer to DRM device
167 * IRQ handler for amdgpu driver (all ASICs).
170 * result of handling the IRQ, as defined by &irqreturn_t
172 irqreturn_t amdgpu_irq_handler(int irq, void *arg)
174 struct drm_device *dev = (struct drm_device *) arg;
175 struct amdgpu_device *adev = dev->dev_private;
178 ret = amdgpu_ih_process(adev, &adev->irq.ih, amdgpu_irq_callback);
179 if (ret == IRQ_HANDLED)
180 pm_runtime_mark_last_busy(dev->dev);
185 * amdgpu_msi_ok - check whether MSI functionality is enabled
187 * @adev: amdgpu device pointer (unused)
189 * Checks whether MSI functionality has been disabled via module parameter
193 * *true* if MSIs are allowed to be enabled or *false* otherwise
195 static bool amdgpu_msi_ok(struct amdgpu_device *adev)
199 else if (amdgpu_msi == 0)
206 * amdgpu_irq_init - initialize interrupt handling
208 * @adev: amdgpu device pointer
210 * Sets up work functions for hotplug and reset interrupts, enables MSI
211 * functionality, initializes vblank, hotplug and reset interrupt handling.
214 * 0 on success or error code on failure
216 int amdgpu_irq_init(struct amdgpu_device *adev)
220 spin_lock_init(&adev->irq.lock);
222 /* Enable MSI if not disabled by module parameter */
223 adev->irq.msi_enabled = false;
225 if (amdgpu_msi_ok(adev)) {
226 int ret = pci_enable_msi(adev->pdev);
228 adev->irq.msi_enabled = true;
229 dev_dbg(adev->dev, "amdgpu: using MSI.\n");
233 if (!amdgpu_device_has_dc_support(adev)) {
234 if (!adev->enable_virtual_display)
235 /* Disable vblank IRQs aggressively for power-saving */
236 /* XXX: can this be enabled for DC? */
237 adev->ddev->vblank_disable_immediate = true;
239 r = drm_vblank_init(adev->ddev, adev->mode_info.num_crtc);
244 INIT_WORK(&adev->hotplug_work,
245 amdgpu_hotplug_work_func);
248 adev->irq.installed = true;
249 r = drm_irq_install(adev->ddev, adev->ddev->pdev->irq);
251 adev->irq.installed = false;
252 if (!amdgpu_device_has_dc_support(adev))
253 flush_work(&adev->hotplug_work);
256 adev->ddev->max_vblank_count = 0x00ffffff;
258 DRM_DEBUG("amdgpu: irq initialized.\n");
263 * amdgpu_irq_fini - shut down interrupt handling
265 * @adev: amdgpu device pointer
267 * Tears down work functions for hotplug and reset interrupts, disables MSI
268 * functionality, shuts down vblank, hotplug and reset interrupt handling,
269 * turns off interrupts from all sources (all ASICs).
271 void amdgpu_irq_fini(struct amdgpu_device *adev)
275 if (adev->irq.installed) {
276 drm_irq_uninstall(adev->ddev);
277 adev->irq.installed = false;
278 if (adev->irq.msi_enabled)
279 pci_disable_msi(adev->pdev);
280 if (!amdgpu_device_has_dc_support(adev))
281 flush_work(&adev->hotplug_work);
284 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
285 if (!adev->irq.client[i].sources)
288 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
289 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
294 kfree(src->enabled_types);
295 src->enabled_types = NULL;
299 adev->irq.client[i].sources[j] = NULL;
302 kfree(adev->irq.client[i].sources);
303 adev->irq.client[i].sources = NULL;
308 * amdgpu_irq_add_id - register IRQ source
310 * @adev: amdgpu device pointer
311 * @client_id: client id
313 * @source: IRQ source pointer
315 * Registers IRQ source on a client.
318 * 0 on success or error code otherwise
320 int amdgpu_irq_add_id(struct amdgpu_device *adev,
321 unsigned client_id, unsigned src_id,
322 struct amdgpu_irq_src *source)
324 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX)
327 if (src_id >= AMDGPU_MAX_IRQ_SRC_ID)
333 if (!adev->irq.client[client_id].sources) {
334 adev->irq.client[client_id].sources =
335 kcalloc(AMDGPU_MAX_IRQ_SRC_ID,
336 sizeof(struct amdgpu_irq_src *),
338 if (!adev->irq.client[client_id].sources)
342 if (adev->irq.client[client_id].sources[src_id] != NULL)
345 if (source->num_types && !source->enabled_types) {
348 types = kcalloc(source->num_types, sizeof(atomic_t),
353 source->enabled_types = types;
356 adev->irq.client[client_id].sources[src_id] = source;
361 * amdgpu_irq_dispatch - dispatch IRQ to IP blocks
363 * @adev: amdgpu device pointer
364 * @entry: interrupt vector pointer
366 * Dispatches IRQ to IP blocks.
368 void amdgpu_irq_dispatch(struct amdgpu_device *adev,
369 struct amdgpu_iv_entry *entry)
371 unsigned client_id = entry->client_id;
372 unsigned src_id = entry->src_id;
373 struct amdgpu_irq_src *src;
376 trace_amdgpu_iv(entry);
378 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX) {
379 DRM_DEBUG("Invalid client_id in IV: %d\n", client_id);
383 if (src_id >= AMDGPU_MAX_IRQ_SRC_ID) {
384 DRM_DEBUG("Invalid src_id in IV: %d\n", src_id);
388 if (adev->irq.virq[src_id]) {
389 generic_handle_irq(irq_find_mapping(adev->irq.domain, src_id));
391 if (!adev->irq.client[client_id].sources) {
392 DRM_DEBUG("Unregistered interrupt client_id: %d src_id: %d\n",
397 src = adev->irq.client[client_id].sources[src_id];
399 DRM_DEBUG("Unhandled interrupt src_id: %d\n", src_id);
403 r = src->funcs->process(adev, src, entry);
405 DRM_ERROR("error processing interrupt (%d)\n", r);
410 * amdgpu_irq_update - update hardware interrupt state
412 * @adev: amdgpu device pointer
413 * @src: interrupt source pointer
414 * @type: type of interrupt
416 * Updates interrupt state for the specific source (all ASICs).
418 int amdgpu_irq_update(struct amdgpu_device *adev,
419 struct amdgpu_irq_src *src, unsigned type)
421 unsigned long irqflags;
422 enum amdgpu_interrupt_state state;
425 spin_lock_irqsave(&adev->irq.lock, irqflags);
427 /* We need to determine after taking the lock, otherwise
428 we might disable just enabled interrupts again */
429 if (amdgpu_irq_enabled(adev, src, type))
430 state = AMDGPU_IRQ_STATE_ENABLE;
432 state = AMDGPU_IRQ_STATE_DISABLE;
434 r = src->funcs->set(adev, src, type, state);
435 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
440 * amdgpu_irq_gpu_reset_resume_helper - update interrupt states on all sources
442 * @adev: amdgpu device pointer
444 * Updates state of all types of interrupts on all sources on resume after
447 void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev)
451 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
452 if (!adev->irq.client[i].sources)
455 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
456 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
460 for (k = 0; k < src->num_types; k++)
461 amdgpu_irq_update(adev, src, k);
467 * amdgpu_irq_get - enable interrupt
469 * @adev: amdgpu device pointer
470 * @src: interrupt source pointer
471 * @type: type of interrupt
473 * Enables specified type of interrupt on the specified source (all ASICs).
476 * 0 on success or error code otherwise
478 int amdgpu_irq_get(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
481 if (!adev->ddev->irq_enabled)
484 if (type >= src->num_types)
487 if (!src->enabled_types || !src->funcs->set)
490 if (atomic_inc_return(&src->enabled_types[type]) == 1)
491 return amdgpu_irq_update(adev, src, type);
497 * amdgpu_irq_put - disable interrupt
499 * @adev: amdgpu device pointer
500 * @src: interrupt source pointer
501 * @type: type of interrupt
503 * Enables specified type of interrupt on the specified source (all ASICs).
506 * 0 on success or error code otherwise
508 int amdgpu_irq_put(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
511 if (!adev->ddev->irq_enabled)
514 if (type >= src->num_types)
517 if (!src->enabled_types || !src->funcs->set)
520 if (atomic_dec_and_test(&src->enabled_types[type]))
521 return amdgpu_irq_update(adev, src, type);
527 * amdgpu_irq_enabled - check whether interrupt is enabled or not
529 * @adev: amdgpu device pointer
530 * @src: interrupt source pointer
531 * @type: type of interrupt
533 * Checks whether the given type of interrupt is enabled on the given source.
536 * *true* if interrupt is enabled, *false* if interrupt is disabled or on
539 bool amdgpu_irq_enabled(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
542 if (!adev->ddev->irq_enabled)
545 if (type >= src->num_types)
548 if (!src->enabled_types || !src->funcs->set)
551 return !!atomic_read(&src->enabled_types[type]);
554 /* XXX: Generic IRQ handling */
555 static void amdgpu_irq_mask(struct irq_data *irqd)
560 static void amdgpu_irq_unmask(struct irq_data *irqd)
565 /* amdgpu hardware interrupt chip descriptor */
566 static struct irq_chip amdgpu_irq_chip = {
568 .irq_mask = amdgpu_irq_mask,
569 .irq_unmask = amdgpu_irq_unmask,
573 * amdgpu_irqdomain_map - create mapping between virtual and hardware IRQ numbers
575 * @d: amdgpu IRQ domain pointer (unused)
576 * @irq: virtual IRQ number
577 * @hwirq: hardware irq number
579 * Current implementation assigns simple interrupt handler to the given virtual
583 * 0 on success or error code otherwise
585 static int amdgpu_irqdomain_map(struct irq_domain *d,
586 unsigned int irq, irq_hw_number_t hwirq)
588 if (hwirq >= AMDGPU_MAX_IRQ_SRC_ID)
591 irq_set_chip_and_handler(irq,
592 &amdgpu_irq_chip, handle_simple_irq);
596 /* Implementation of methods for amdgpu IRQ domain */
597 static const struct irq_domain_ops amdgpu_hw_irqdomain_ops = {
598 .map = amdgpu_irqdomain_map,
602 * amdgpu_irq_add_domain - create a linear IRQ domain
604 * @adev: amdgpu device pointer
606 * Creates an IRQ domain for GPU interrupt sources
607 * that may be driven by another driver (e.g., ACP).
610 * 0 on success or error code otherwise
612 int amdgpu_irq_add_domain(struct amdgpu_device *adev)
614 adev->irq.domain = irq_domain_add_linear(NULL, AMDGPU_MAX_IRQ_SRC_ID,
615 &amdgpu_hw_irqdomain_ops, adev);
616 if (!adev->irq.domain) {
617 DRM_ERROR("GPU irq add domain failed\n");
625 * amdgpu_irq_remove_domain - remove the IRQ domain
627 * @adev: amdgpu device pointer
629 * Removes the IRQ domain for GPU interrupt sources
630 * that may be driven by another driver (e.g., ACP).
632 void amdgpu_irq_remove_domain(struct amdgpu_device *adev)
634 if (adev->irq.domain) {
635 irq_domain_remove(adev->irq.domain);
636 adev->irq.domain = NULL;
641 * amdgpu_irq_create_mapping - create mapping between domain Linux IRQs
643 * @adev: amdgpu device pointer
644 * @src_id: IH source id
646 * Creates mapping between a domain IRQ (GPU IH src id) and a Linux IRQ
647 * Use this for components that generate a GPU interrupt, but are driven
648 * by a different driver (e.g., ACP).
653 unsigned amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned src_id)
655 adev->irq.virq[src_id] = irq_create_mapping(adev->irq.domain, src_id);
657 return adev->irq.virq[src_id];