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_irq.h>
50 #include <drm/drm_vblank.h>
51 #include <drm/amdgpu_drm.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
69 * amdgpu_hotplug_work_func - work handler for display hotplug event
71 * @work: work struct pointer
73 * This is the hotplug event work handler (all ASICs).
74 * The work gets scheduled from the IRQ handler if there
75 * was a hotplug interrupt. It walks through the connector table
76 * and calls hotplug handler for each connector. After this, it sends
77 * a DRM hotplug event to alert userspace.
79 * This design approach is required in order to defer hotplug event handling
80 * from the IRQ handler to a work handler because hotplug handler has to use
81 * mutexes which cannot be locked in an IRQ handler (since &mutex_lock may
84 static void amdgpu_hotplug_work_func(struct work_struct *work)
86 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
88 struct drm_device *dev = adev->ddev;
89 struct drm_mode_config *mode_config = &dev->mode_config;
90 struct drm_connector *connector;
91 struct drm_connector_list_iter iter;
93 mutex_lock(&mode_config->mutex);
94 drm_connector_list_iter_begin(dev, &iter);
95 drm_for_each_connector_iter(connector, &iter)
96 amdgpu_connector_hotplug(connector);
97 drm_connector_list_iter_end(&iter);
98 mutex_unlock(&mode_config->mutex);
99 /* Just fire off a uevent and let userspace tell us what to do */
100 drm_helper_hpd_irq_event(dev);
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 irqreturn_t amdgpu_irq_handler(int irq, void *arg)
153 struct drm_device *dev = (struct drm_device *) arg;
154 struct amdgpu_device *adev = dev->dev_private;
157 ret = amdgpu_ih_process(adev, &adev->irq.ih);
158 if (ret == IRQ_HANDLED)
159 pm_runtime_mark_last_busy(dev->dev);
161 /* For the hardware that cannot enable bif ring for both ras_controller_irq
162 * and ras_err_evnet_athub_irq ih cookies, the driver has to poll status
163 * register to check whether the interrupt is triggered or not, and properly
164 * ack the interrupt if it is there
166 if (amdgpu_ras_is_supported(adev, AMDGPU_RAS_BLOCK__PCIE_BIF)) {
167 if (adev->nbio.funcs &&
168 adev->nbio.funcs->handle_ras_controller_intr_no_bifring)
169 adev->nbio.funcs->handle_ras_controller_intr_no_bifring(adev);
171 if (adev->nbio.funcs &&
172 adev->nbio.funcs->handle_ras_err_event_athub_intr_no_bifring)
173 adev->nbio.funcs->handle_ras_err_event_athub_intr_no_bifring(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_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 nvec = pci_msix_vec_count(adev->pdev);
257 flags = PCI_IRQ_MSI | PCI_IRQ_MSIX;
259 /* we only need one vector */
260 nvec = pci_alloc_irq_vectors(adev->pdev, 1, 1, flags);
262 adev->irq.msi_enabled = true;
263 dev_dbg(adev->dev, "using MSI/MSI-X.\n");
267 if (!amdgpu_device_has_dc_support(adev)) {
268 if (!adev->enable_virtual_display)
269 /* Disable vblank IRQs aggressively for power-saving */
270 /* XXX: can this be enabled for DC? */
271 adev->ddev->vblank_disable_immediate = true;
273 r = drm_vblank_init(adev->ddev, adev->mode_info.num_crtc);
278 INIT_WORK(&adev->hotplug_work,
279 amdgpu_hotplug_work_func);
282 INIT_WORK(&adev->irq.ih1_work, amdgpu_irq_handle_ih1);
283 INIT_WORK(&adev->irq.ih2_work, amdgpu_irq_handle_ih2);
285 adev->irq.installed = true;
286 /* Use vector 0 for MSI-X */
287 r = drm_irq_install(adev->ddev, pci_irq_vector(adev->pdev, 0));
289 adev->irq.installed = false;
290 if (!amdgpu_device_has_dc_support(adev))
291 flush_work(&adev->hotplug_work);
294 adev->ddev->max_vblank_count = 0x00ffffff;
296 DRM_DEBUG("amdgpu: irq initialized.\n");
301 * amdgpu_irq_fini - shut down interrupt handling
303 * @adev: amdgpu device pointer
305 * Tears down work functions for hotplug and reset interrupts, disables MSI
306 * functionality, shuts down vblank, hotplug and reset interrupt handling,
307 * turns off interrupts from all sources (all ASICs).
309 void amdgpu_irq_fini(struct amdgpu_device *adev)
313 if (adev->irq.installed) {
314 drm_irq_uninstall(adev->ddev);
315 adev->irq.installed = false;
316 if (adev->irq.msi_enabled)
317 pci_free_irq_vectors(adev->pdev);
318 if (!amdgpu_device_has_dc_support(adev))
319 flush_work(&adev->hotplug_work);
322 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
323 if (!adev->irq.client[i].sources)
326 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
327 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
332 kfree(src->enabled_types);
333 src->enabled_types = NULL;
337 adev->irq.client[i].sources[j] = NULL;
340 kfree(adev->irq.client[i].sources);
341 adev->irq.client[i].sources = NULL;
346 * amdgpu_irq_add_id - register IRQ source
348 * @adev: amdgpu device pointer
349 * @client_id: client id
351 * @source: IRQ source pointer
353 * Registers IRQ source on a client.
356 * 0 on success or error code otherwise
358 int amdgpu_irq_add_id(struct amdgpu_device *adev,
359 unsigned client_id, unsigned src_id,
360 struct amdgpu_irq_src *source)
362 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX)
365 if (src_id >= AMDGPU_MAX_IRQ_SRC_ID)
371 if (!adev->irq.client[client_id].sources) {
372 adev->irq.client[client_id].sources =
373 kcalloc(AMDGPU_MAX_IRQ_SRC_ID,
374 sizeof(struct amdgpu_irq_src *),
376 if (!adev->irq.client[client_id].sources)
380 if (adev->irq.client[client_id].sources[src_id] != NULL)
383 if (source->num_types && !source->enabled_types) {
386 types = kcalloc(source->num_types, sizeof(atomic_t),
391 source->enabled_types = types;
394 adev->irq.client[client_id].sources[src_id] = source;
399 * amdgpu_irq_dispatch - dispatch IRQ to IP blocks
401 * @adev: amdgpu device pointer
402 * @ih: interrupt ring instance
404 * Dispatches IRQ to IP blocks.
406 void amdgpu_irq_dispatch(struct amdgpu_device *adev,
407 struct amdgpu_ih_ring *ih)
409 u32 ring_index = ih->rptr >> 2;
410 struct amdgpu_iv_entry entry;
411 unsigned client_id, src_id;
412 struct amdgpu_irq_src *src;
413 bool handled = false;
416 entry.iv_entry = (const uint32_t *)&ih->ring[ring_index];
417 amdgpu_ih_decode_iv(adev, &entry);
419 trace_amdgpu_iv(ih - &adev->irq.ih, &entry);
421 client_id = entry.client_id;
422 src_id = entry.src_id;
424 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX) {
425 DRM_DEBUG("Invalid client_id in IV: %d\n", client_id);
427 } else if (src_id >= AMDGPU_MAX_IRQ_SRC_ID) {
428 DRM_DEBUG("Invalid src_id in IV: %d\n", src_id);
430 } else if (adev->irq.virq[src_id]) {
431 generic_handle_irq(irq_find_mapping(adev->irq.domain, src_id));
433 } else if (!adev->irq.client[client_id].sources) {
434 DRM_DEBUG("Unregistered interrupt client_id: %d src_id: %d\n",
437 } else if ((src = adev->irq.client[client_id].sources[src_id])) {
438 r = src->funcs->process(adev, src, &entry);
440 DRM_ERROR("error processing interrupt (%d)\n", r);
445 DRM_DEBUG("Unhandled interrupt src_id: %d\n", src_id);
448 /* Send it to amdkfd as well if it isn't already handled */
450 amdgpu_amdkfd_interrupt(adev, entry.iv_entry);
454 * amdgpu_irq_update - update hardware interrupt state
456 * @adev: amdgpu device pointer
457 * @src: interrupt source pointer
458 * @type: type of interrupt
460 * Updates interrupt state for the specific source (all ASICs).
462 int amdgpu_irq_update(struct amdgpu_device *adev,
463 struct amdgpu_irq_src *src, unsigned type)
465 unsigned long irqflags;
466 enum amdgpu_interrupt_state state;
469 spin_lock_irqsave(&adev->irq.lock, irqflags);
471 /* We need to determine after taking the lock, otherwise
472 we might disable just enabled interrupts again */
473 if (amdgpu_irq_enabled(adev, src, type))
474 state = AMDGPU_IRQ_STATE_ENABLE;
476 state = AMDGPU_IRQ_STATE_DISABLE;
478 r = src->funcs->set(adev, src, type, state);
479 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
484 * amdgpu_irq_gpu_reset_resume_helper - update interrupt states on all sources
486 * @adev: amdgpu device pointer
488 * Updates state of all types of interrupts on all sources on resume after
491 void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev)
495 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
496 if (!adev->irq.client[i].sources)
499 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
500 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
504 for (k = 0; k < src->num_types; k++)
505 amdgpu_irq_update(adev, src, k);
511 * amdgpu_irq_get - enable interrupt
513 * @adev: amdgpu device pointer
514 * @src: interrupt source pointer
515 * @type: type of interrupt
517 * Enables specified type of interrupt on the specified source (all ASICs).
520 * 0 on success or error code otherwise
522 int amdgpu_irq_get(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
525 if (!adev->ddev->irq_enabled)
528 if (type >= src->num_types)
531 if (!src->enabled_types || !src->funcs->set)
534 if (atomic_inc_return(&src->enabled_types[type]) == 1)
535 return amdgpu_irq_update(adev, src, type);
541 * amdgpu_irq_put - disable interrupt
543 * @adev: amdgpu device pointer
544 * @src: interrupt source pointer
545 * @type: type of interrupt
547 * Enables specified type of interrupt on the specified source (all ASICs).
550 * 0 on success or error code otherwise
552 int amdgpu_irq_put(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
555 if (!adev->ddev->irq_enabled)
558 if (type >= src->num_types)
561 if (!src->enabled_types || !src->funcs->set)
564 if (atomic_dec_and_test(&src->enabled_types[type]))
565 return amdgpu_irq_update(adev, src, type);
571 * amdgpu_irq_enabled - check whether interrupt is enabled or not
573 * @adev: amdgpu device pointer
574 * @src: interrupt source pointer
575 * @type: type of interrupt
577 * Checks whether the given type of interrupt is enabled on the given source.
580 * *true* if interrupt is enabled, *false* if interrupt is disabled or on
583 bool amdgpu_irq_enabled(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
586 if (!adev->ddev->irq_enabled)
589 if (type >= src->num_types)
592 if (!src->enabled_types || !src->funcs->set)
595 return !!atomic_read(&src->enabled_types[type]);
598 /* XXX: Generic IRQ handling */
599 static void amdgpu_irq_mask(struct irq_data *irqd)
604 static void amdgpu_irq_unmask(struct irq_data *irqd)
609 /* amdgpu hardware interrupt chip descriptor */
610 static struct irq_chip amdgpu_irq_chip = {
612 .irq_mask = amdgpu_irq_mask,
613 .irq_unmask = amdgpu_irq_unmask,
617 * amdgpu_irqdomain_map - create mapping between virtual and hardware IRQ numbers
619 * @d: amdgpu IRQ domain pointer (unused)
620 * @irq: virtual IRQ number
621 * @hwirq: hardware irq number
623 * Current implementation assigns simple interrupt handler to the given virtual
627 * 0 on success or error code otherwise
629 static int amdgpu_irqdomain_map(struct irq_domain *d,
630 unsigned int irq, irq_hw_number_t hwirq)
632 if (hwirq >= AMDGPU_MAX_IRQ_SRC_ID)
635 irq_set_chip_and_handler(irq,
636 &amdgpu_irq_chip, handle_simple_irq);
640 /* Implementation of methods for amdgpu IRQ domain */
641 static const struct irq_domain_ops amdgpu_hw_irqdomain_ops = {
642 .map = amdgpu_irqdomain_map,
646 * amdgpu_irq_add_domain - create a linear IRQ domain
648 * @adev: amdgpu device pointer
650 * Creates an IRQ domain for GPU interrupt sources
651 * that may be driven by another driver (e.g., ACP).
654 * 0 on success or error code otherwise
656 int amdgpu_irq_add_domain(struct amdgpu_device *adev)
658 adev->irq.domain = irq_domain_add_linear(NULL, AMDGPU_MAX_IRQ_SRC_ID,
659 &amdgpu_hw_irqdomain_ops, adev);
660 if (!adev->irq.domain) {
661 DRM_ERROR("GPU irq add domain failed\n");
669 * amdgpu_irq_remove_domain - remove the IRQ domain
671 * @adev: amdgpu device pointer
673 * Removes the IRQ domain for GPU interrupt sources
674 * that may be driven by another driver (e.g., ACP).
676 void amdgpu_irq_remove_domain(struct amdgpu_device *adev)
678 if (adev->irq.domain) {
679 irq_domain_remove(adev->irq.domain);
680 adev->irq.domain = NULL;
685 * amdgpu_irq_create_mapping - create mapping between domain Linux IRQs
687 * @adev: amdgpu device pointer
688 * @src_id: IH source id
690 * Creates mapping between a domain IRQ (GPU IH src id) and a Linux IRQ
691 * Use this for components that generate a GPU interrupt, but are driven
692 * by a different driver (e.g., ACP).
697 unsigned amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned src_id)
699 adev->irq.virq[src_id] = irq_create_mapping(adev->irq.domain, src_id);
701 return adev->irq.virq[src_id];