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1/*
2 * Copyright 2008 Advanced Micro Devices, Inc.
3 * Copyright 2008 Red Hat Inc.
4 * Copyright 2009 Jerome Glisse.
5 *
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:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
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.
23 *
24 * Authors: Dave Airlie
25 * Alex Deucher
26 * Jerome Glisse
27 */
28
29/**
30 * DOC: Interrupt Handling
31 *
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.
37 *
38 * If MSI functionality is not disabled by module parameter then MSI
39 * support will be enabled.
40 *
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).
43 */
44
45#include <linux/irq.h>
46#include <linux/pci.h>
47
48#include <drm/drm_crtc_helper.h>
49#include <drm/drm_vblank.h>
50#include <drm/amdgpu_drm.h>
51#include <drm/drm_drv.h>
52#include "amdgpu.h"
53#include "amdgpu_ih.h"
54#include "atom.h"
55#include "amdgpu_connectors.h"
56#include "amdgpu_trace.h"
57#include "amdgpu_amdkfd.h"
58#include "amdgpu_ras.h"
59
60#include <linux/pm_runtime.h>
61
62#ifdef CONFIG_DRM_AMD_DC
63#include "amdgpu_dm_irq.h"
64#endif
65
66#define AMDGPU_WAIT_IDLE_TIMEOUT 200
67
68const char *soc15_ih_clientid_name[] = {
69 "IH",
70 "SDMA2 or ACP",
71 "ATHUB",
72 "BIF",
73 "SDMA3 or DCE",
74 "SDMA4 or ISP",
75 "VMC1 or PCIE0",
76 "RLC",
77 "SDMA0",
78 "SDMA1",
79 "SE0SH",
80 "SE1SH",
81 "SE2SH",
82 "SE3SH",
83 "VCN1 or UVD1",
84 "THM",
85 "VCN or UVD",
86 "SDMA5 or VCE0",
87 "VMC",
88 "SDMA6 or XDMA",
89 "GRBM_CP",
90 "ATS",
91 "ROM_SMUIO",
92 "DF",
93 "SDMA7 or VCE1",
94 "PWR",
95 "reserved",
96 "UTCL2",
97 "EA",
98 "UTCL2LOG",
99 "MP0",
100 "MP1"
101};
102
103/**
104 * amdgpu_irq_disable_all - disable *all* interrupts
105 *
106 * @adev: amdgpu device pointer
107 *
108 * Disable all types of interrupts from all sources.
109 */
110void amdgpu_irq_disable_all(struct amdgpu_device *adev)
111{
112 unsigned long irqflags;
113 unsigned i, j, k;
114 int r;
115
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)
119 continue;
120
121 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
122 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
123
124 if (!src || !src->funcs->set || !src->num_types)
125 continue;
126
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);
131 if (r)
132 DRM_ERROR("error disabling interrupt (%d)\n",
133 r);
134 }
135 }
136 }
137 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
138}
139
140/**
141 * amdgpu_irq_handler - IRQ handler
142 *
143 * @irq: IRQ number (unused)
144 * @arg: pointer to DRM device
145 *
146 * IRQ handler for amdgpu driver (all ASICs).
147 *
148 * Returns:
149 * result of handling the IRQ, as defined by &irqreturn_t
150 */
151static irqreturn_t amdgpu_irq_handler(int irq, void *arg)
152{
153 struct drm_device *dev = (struct drm_device *) arg;
154 struct amdgpu_device *adev = drm_to_adev(dev);
155 irqreturn_t ret;
156
157 ret = amdgpu_ih_process(adev, &adev->irq.ih);
158 if (ret == IRQ_HANDLED)
159 pm_runtime_mark_last_busy(dev->dev);
160
161 amdgpu_ras_interrupt_fatal_error_handler(adev);
162
163 return ret;
164}
165
166/**
167 * amdgpu_irq_handle_ih1 - kick of processing for IH1
168 *
169 * @work: work structure in struct amdgpu_irq
170 *
171 * Kick of processing IH ring 1.
172 */
173static void amdgpu_irq_handle_ih1(struct work_struct *work)
174{
175 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
176 irq.ih1_work);
177
178 amdgpu_ih_process(adev, &adev->irq.ih1);
179}
180
181/**
182 * amdgpu_irq_handle_ih2 - kick of processing for IH2
183 *
184 * @work: work structure in struct amdgpu_irq
185 *
186 * Kick of processing IH ring 2.
187 */
188static void amdgpu_irq_handle_ih2(struct work_struct *work)
189{
190 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
191 irq.ih2_work);
192
193 amdgpu_ih_process(adev, &adev->irq.ih2);
194}
195
196/**
197 * amdgpu_irq_handle_ih_soft - kick of processing for ih_soft
198 *
199 * @work: work structure in struct amdgpu_irq
200 *
201 * Kick of processing IH soft ring.
202 */
203static void amdgpu_irq_handle_ih_soft(struct work_struct *work)
204{
205 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
206 irq.ih_soft_work);
207
208 amdgpu_ih_process(adev, &adev->irq.ih_soft);
209}
210
211/**
212 * amdgpu_msi_ok - check whether MSI functionality is enabled
213 *
214 * @adev: amdgpu device pointer (unused)
215 *
216 * Checks whether MSI functionality has been disabled via module parameter
217 * (all ASICs).
218 *
219 * Returns:
220 * *true* if MSIs are allowed to be enabled or *false* otherwise
221 */
222static bool amdgpu_msi_ok(struct amdgpu_device *adev)
223{
224 if (amdgpu_msi == 1)
225 return true;
226 else if (amdgpu_msi == 0)
227 return false;
228
229 return true;
230}
231
232static void amdgpu_restore_msix(struct amdgpu_device *adev)
233{
234 u16 ctrl;
235
236 pci_read_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, &ctrl);
237 if (!(ctrl & PCI_MSIX_FLAGS_ENABLE))
238 return;
239
240 /* VF FLR */
241 ctrl &= ~PCI_MSIX_FLAGS_ENABLE;
242 pci_write_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, ctrl);
243 ctrl |= PCI_MSIX_FLAGS_ENABLE;
244 pci_write_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, ctrl);
245}
246
247/**
248 * amdgpu_irq_init - initialize interrupt handling
249 *
250 * @adev: amdgpu device pointer
251 *
252 * Sets up work functions for hotplug and reset interrupts, enables MSI
253 * functionality, initializes vblank, hotplug and reset interrupt handling.
254 *
255 * Returns:
256 * 0 on success or error code on failure
257 */
258int amdgpu_irq_init(struct amdgpu_device *adev)
259{
260 int r = 0;
261 unsigned int irq;
262
263 spin_lock_init(&adev->irq.lock);
264
265 /* Enable MSI if not disabled by module parameter */
266 adev->irq.msi_enabled = false;
267
268 if (amdgpu_msi_ok(adev)) {
269 int nvec = pci_msix_vec_count(adev->pdev);
270 unsigned int flags;
271
272 if (nvec <= 0) {
273 flags = PCI_IRQ_MSI;
274 } else {
275 flags = PCI_IRQ_MSI | PCI_IRQ_MSIX;
276 }
277 /* we only need one vector */
278 nvec = pci_alloc_irq_vectors(adev->pdev, 1, 1, flags);
279 if (nvec > 0) {
280 adev->irq.msi_enabled = true;
281 dev_dbg(adev->dev, "using MSI/MSI-X.\n");
282 }
283 }
284
285 INIT_WORK(&adev->irq.ih1_work, amdgpu_irq_handle_ih1);
286 INIT_WORK(&adev->irq.ih2_work, amdgpu_irq_handle_ih2);
287 INIT_WORK(&adev->irq.ih_soft_work, amdgpu_irq_handle_ih_soft);
288
289 /* Use vector 0 for MSI-X. */
290 r = pci_irq_vector(adev->pdev, 0);
291 if (r < 0)
292 return r;
293 irq = r;
294
295 /* PCI devices require shared interrupts. */
296 r = request_irq(irq, amdgpu_irq_handler, IRQF_SHARED, adev_to_drm(adev)->driver->name,
297 adev_to_drm(adev));
298 if (r)
299 return r;
300 adev->irq.installed = true;
301 adev->irq.irq = irq;
302 adev_to_drm(adev)->max_vblank_count = 0x00ffffff;
303
304 DRM_DEBUG("amdgpu: irq initialized.\n");
305 return 0;
306}
307
308
309void amdgpu_irq_fini_hw(struct amdgpu_device *adev)
310{
311 if (adev->irq.installed) {
312 free_irq(adev->irq.irq, adev_to_drm(adev));
313 adev->irq.installed = false;
314 if (adev->irq.msi_enabled)
315 pci_free_irq_vectors(adev->pdev);
316 }
317
318 amdgpu_ih_ring_fini(adev, &adev->irq.ih_soft);
319 amdgpu_ih_ring_fini(adev, &adev->irq.ih);
320 amdgpu_ih_ring_fini(adev, &adev->irq.ih1);
321 amdgpu_ih_ring_fini(adev, &adev->irq.ih2);
322}
323
324/**
325 * amdgpu_irq_fini_sw - shut down interrupt handling
326 *
327 * @adev: amdgpu device pointer
328 *
329 * Tears down work functions for hotplug and reset interrupts, disables MSI
330 * functionality, shuts down vblank, hotplug and reset interrupt handling,
331 * turns off interrupts from all sources (all ASICs).
332 */
333void amdgpu_irq_fini_sw(struct amdgpu_device *adev)
334{
335 unsigned i, j;
336
337 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
338 if (!adev->irq.client[i].sources)
339 continue;
340
341 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
342 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
343
344 if (!src)
345 continue;
346
347 kfree(src->enabled_types);
348 src->enabled_types = NULL;
349 }
350 kfree(adev->irq.client[i].sources);
351 adev->irq.client[i].sources = NULL;
352 }
353}
354
355/**
356 * amdgpu_irq_add_id - register IRQ source
357 *
358 * @adev: amdgpu device pointer
359 * @client_id: client id
360 * @src_id: source id
361 * @source: IRQ source pointer
362 *
363 * Registers IRQ source on a client.
364 *
365 * Returns:
366 * 0 on success or error code otherwise
367 */
368int amdgpu_irq_add_id(struct amdgpu_device *adev,
369 unsigned client_id, unsigned src_id,
370 struct amdgpu_irq_src *source)
371{
372 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX)
373 return -EINVAL;
374
375 if (src_id >= AMDGPU_MAX_IRQ_SRC_ID)
376 return -EINVAL;
377
378 if (!source->funcs)
379 return -EINVAL;
380
381 if (!adev->irq.client[client_id].sources) {
382 adev->irq.client[client_id].sources =
383 kcalloc(AMDGPU_MAX_IRQ_SRC_ID,
384 sizeof(struct amdgpu_irq_src *),
385 GFP_KERNEL);
386 if (!adev->irq.client[client_id].sources)
387 return -ENOMEM;
388 }
389
390 if (adev->irq.client[client_id].sources[src_id] != NULL)
391 return -EINVAL;
392
393 if (source->num_types && !source->enabled_types) {
394 atomic_t *types;
395
396 types = kcalloc(source->num_types, sizeof(atomic_t),
397 GFP_KERNEL);
398 if (!types)
399 return -ENOMEM;
400
401 source->enabled_types = types;
402 }
403
404 adev->irq.client[client_id].sources[src_id] = source;
405 return 0;
406}
407
408/**
409 * amdgpu_irq_dispatch - dispatch IRQ to IP blocks
410 *
411 * @adev: amdgpu device pointer
412 * @ih: interrupt ring instance
413 *
414 * Dispatches IRQ to IP blocks.
415 */
416void amdgpu_irq_dispatch(struct amdgpu_device *adev,
417 struct amdgpu_ih_ring *ih)
418{
419 u32 ring_index = ih->rptr >> 2;
420 struct amdgpu_iv_entry entry;
421 unsigned client_id, src_id;
422 struct amdgpu_irq_src *src;
423 bool handled = false;
424 int r;
425
426 entry.ih = ih;
427 entry.iv_entry = (const uint32_t *)&ih->ring[ring_index];
428 amdgpu_ih_decode_iv(adev, &entry);
429
430 trace_amdgpu_iv(ih - &adev->irq.ih, &entry);
431
432 client_id = entry.client_id;
433 src_id = entry.src_id;
434
435 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX) {
436 DRM_DEBUG("Invalid client_id in IV: %d\n", client_id);
437
438 } else if (src_id >= AMDGPU_MAX_IRQ_SRC_ID) {
439 DRM_DEBUG("Invalid src_id in IV: %d\n", src_id);
440
441 } else if ((client_id == AMDGPU_IRQ_CLIENTID_LEGACY) &&
442 adev->irq.virq[src_id]) {
443 generic_handle_domain_irq(adev->irq.domain, src_id);
444
445 } else if (!adev->irq.client[client_id].sources) {
446 DRM_DEBUG("Unregistered interrupt client_id: %d src_id: %d\n",
447 client_id, src_id);
448
449 } else if ((src = adev->irq.client[client_id].sources[src_id])) {
450 r = src->funcs->process(adev, src, &entry);
451 if (r < 0)
452 DRM_ERROR("error processing interrupt (%d)\n", r);
453 else if (r)
454 handled = true;
455
456 } else {
457 DRM_DEBUG("Unhandled interrupt src_id: %d\n", src_id);
458 }
459
460 /* Send it to amdkfd as well if it isn't already handled */
461 if (!handled)
462 amdgpu_amdkfd_interrupt(adev, entry.iv_entry);
463
464 if (amdgpu_ih_ts_after(ih->processed_timestamp, entry.timestamp))
465 ih->processed_timestamp = entry.timestamp;
466}
467
468/**
469 * amdgpu_irq_delegate - delegate IV to soft IH ring
470 *
471 * @adev: amdgpu device pointer
472 * @entry: IV entry
473 * @num_dw: size of IV
474 *
475 * Delegate the IV to the soft IH ring and schedule processing of it. Used
476 * if the hardware delegation to IH1 or IH2 doesn't work for some reason.
477 */
478void amdgpu_irq_delegate(struct amdgpu_device *adev,
479 struct amdgpu_iv_entry *entry,
480 unsigned int num_dw)
481{
482 amdgpu_ih_ring_write(&adev->irq.ih_soft, entry->iv_entry, num_dw);
483 schedule_work(&adev->irq.ih_soft_work);
484}
485
486/**
487 * amdgpu_irq_update - update hardware interrupt state
488 *
489 * @adev: amdgpu device pointer
490 * @src: interrupt source pointer
491 * @type: type of interrupt
492 *
493 * Updates interrupt state for the specific source (all ASICs).
494 */
495int amdgpu_irq_update(struct amdgpu_device *adev,
496 struct amdgpu_irq_src *src, unsigned type)
497{
498 unsigned long irqflags;
499 enum amdgpu_interrupt_state state;
500 int r;
501
502 spin_lock_irqsave(&adev->irq.lock, irqflags);
503
504 /* We need to determine after taking the lock, otherwise
505 we might disable just enabled interrupts again */
506 if (amdgpu_irq_enabled(adev, src, type))
507 state = AMDGPU_IRQ_STATE_ENABLE;
508 else
509 state = AMDGPU_IRQ_STATE_DISABLE;
510
511 r = src->funcs->set(adev, src, type, state);
512 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
513 return r;
514}
515
516/**
517 * amdgpu_irq_gpu_reset_resume_helper - update interrupt states on all sources
518 *
519 * @adev: amdgpu device pointer
520 *
521 * Updates state of all types of interrupts on all sources on resume after
522 * reset.
523 */
524void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev)
525{
526 int i, j, k;
527
528 if (amdgpu_sriov_vf(adev) || amdgpu_passthrough(adev))
529 amdgpu_restore_msix(adev);
530
531 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
532 if (!adev->irq.client[i].sources)
533 continue;
534
535 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
536 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
537
538 if (!src || !src->funcs || !src->funcs->set)
539 continue;
540 for (k = 0; k < src->num_types; k++)
541 amdgpu_irq_update(adev, src, k);
542 }
543 }
544}
545
546/**
547 * amdgpu_irq_get - enable interrupt
548 *
549 * @adev: amdgpu device pointer
550 * @src: interrupt source pointer
551 * @type: type of interrupt
552 *
553 * Enables specified type of interrupt on the specified source (all ASICs).
554 *
555 * Returns:
556 * 0 on success or error code otherwise
557 */
558int amdgpu_irq_get(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
559 unsigned type)
560{
561 if (!adev->irq.installed)
562 return -ENOENT;
563
564 if (type >= src->num_types)
565 return -EINVAL;
566
567 if (!src->enabled_types || !src->funcs->set)
568 return -EINVAL;
569
570 if (atomic_inc_return(&src->enabled_types[type]) == 1)
571 return amdgpu_irq_update(adev, src, type);
572
573 return 0;
574}
575
576/**
577 * amdgpu_irq_put - disable interrupt
578 *
579 * @adev: amdgpu device pointer
580 * @src: interrupt source pointer
581 * @type: type of interrupt
582 *
583 * Enables specified type of interrupt on the specified source (all ASICs).
584 *
585 * Returns:
586 * 0 on success or error code otherwise
587 */
588int amdgpu_irq_put(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
589 unsigned type)
590{
591 if (!adev->irq.installed)
592 return -ENOENT;
593
594 if (type >= src->num_types)
595 return -EINVAL;
596
597 if (!src->enabled_types || !src->funcs->set)
598 return -EINVAL;
599
600 if (atomic_dec_and_test(&src->enabled_types[type]))
601 return amdgpu_irq_update(adev, src, type);
602
603 return 0;
604}
605
606/**
607 * amdgpu_irq_enabled - check whether interrupt is enabled or not
608 *
609 * @adev: amdgpu device pointer
610 * @src: interrupt source pointer
611 * @type: type of interrupt
612 *
613 * Checks whether the given type of interrupt is enabled on the given source.
614 *
615 * Returns:
616 * *true* if interrupt is enabled, *false* if interrupt is disabled or on
617 * invalid parameters
618 */
619bool amdgpu_irq_enabled(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
620 unsigned type)
621{
622 if (!adev->irq.installed)
623 return false;
624
625 if (type >= src->num_types)
626 return false;
627
628 if (!src->enabled_types || !src->funcs->set)
629 return false;
630
631 return !!atomic_read(&src->enabled_types[type]);
632}
633
634/* XXX: Generic IRQ handling */
635static void amdgpu_irq_mask(struct irq_data *irqd)
636{
637 /* XXX */
638}
639
640static void amdgpu_irq_unmask(struct irq_data *irqd)
641{
642 /* XXX */
643}
644
645/* amdgpu hardware interrupt chip descriptor */
646static struct irq_chip amdgpu_irq_chip = {
647 .name = "amdgpu-ih",
648 .irq_mask = amdgpu_irq_mask,
649 .irq_unmask = amdgpu_irq_unmask,
650};
651
652/**
653 * amdgpu_irqdomain_map - create mapping between virtual and hardware IRQ numbers
654 *
655 * @d: amdgpu IRQ domain pointer (unused)
656 * @irq: virtual IRQ number
657 * @hwirq: hardware irq number
658 *
659 * Current implementation assigns simple interrupt handler to the given virtual
660 * IRQ.
661 *
662 * Returns:
663 * 0 on success or error code otherwise
664 */
665static int amdgpu_irqdomain_map(struct irq_domain *d,
666 unsigned int irq, irq_hw_number_t hwirq)
667{
668 if (hwirq >= AMDGPU_MAX_IRQ_SRC_ID)
669 return -EPERM;
670
671 irq_set_chip_and_handler(irq,
672 &amdgpu_irq_chip, handle_simple_irq);
673 return 0;
674}
675
676/* Implementation of methods for amdgpu IRQ domain */
677static const struct irq_domain_ops amdgpu_hw_irqdomain_ops = {
678 .map = amdgpu_irqdomain_map,
679};
680
681/**
682 * amdgpu_irq_add_domain - create a linear IRQ domain
683 *
684 * @adev: amdgpu device pointer
685 *
686 * Creates an IRQ domain for GPU interrupt sources
687 * that may be driven by another driver (e.g., ACP).
688 *
689 * Returns:
690 * 0 on success or error code otherwise
691 */
692int amdgpu_irq_add_domain(struct amdgpu_device *adev)
693{
694 adev->irq.domain = irq_domain_add_linear(NULL, AMDGPU_MAX_IRQ_SRC_ID,
695 &amdgpu_hw_irqdomain_ops, adev);
696 if (!adev->irq.domain) {
697 DRM_ERROR("GPU irq add domain failed\n");
698 return -ENODEV;
699 }
700
701 return 0;
702}
703
704/**
705 * amdgpu_irq_remove_domain - remove the IRQ domain
706 *
707 * @adev: amdgpu device pointer
708 *
709 * Removes the IRQ domain for GPU interrupt sources
710 * that may be driven by another driver (e.g., ACP).
711 */
712void amdgpu_irq_remove_domain(struct amdgpu_device *adev)
713{
714 if (adev->irq.domain) {
715 irq_domain_remove(adev->irq.domain);
716 adev->irq.domain = NULL;
717 }
718}
719
720/**
721 * amdgpu_irq_create_mapping - create mapping between domain Linux IRQs
722 *
723 * @adev: amdgpu device pointer
724 * @src_id: IH source id
725 *
726 * Creates mapping between a domain IRQ (GPU IH src id) and a Linux IRQ
727 * Use this for components that generate a GPU interrupt, but are driven
728 * by a different driver (e.g., ACP).
729 *
730 * Returns:
731 * Linux IRQ
732 */
733unsigned amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned src_id)
734{
735 adev->irq.virq[src_id] = irq_create_mapping(adev->irq.domain, src_id);
736
737 return adev->irq.virq[src_id];
738}
1/*
2 * Copyright 2008 Advanced Micro Devices, Inc.
3 * Copyright 2008 Red Hat Inc.
4 * Copyright 2009 Jerome Glisse.
5 *
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:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
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.
23 *
24 * Authors: Dave Airlie
25 * Alex Deucher
26 * Jerome Glisse
27 */
28
29/**
30 * DOC: Interrupt Handling
31 *
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.
37 *
38 * If MSI functionality is not disabled by module parameter then MSI
39 * support will be enabled.
40 *
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).
43 */
44
45#include <linux/irq.h>
46#include <linux/pci.h>
47
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>
52#include "amdgpu.h"
53#include "amdgpu_ih.h"
54#include "atom.h"
55#include "amdgpu_connectors.h"
56#include "amdgpu_trace.h"
57#include "amdgpu_amdkfd.h"
58
59#include <linux/pm_runtime.h>
60
61#ifdef CONFIG_DRM_AMD_DC
62#include "amdgpu_dm_irq.h"
63#endif
64
65#define AMDGPU_WAIT_IDLE_TIMEOUT 200
66
67/**
68 * amdgpu_hotplug_work_func - work handler for display hotplug event
69 *
70 * @work: work struct pointer
71 *
72 * This is the hotplug event work handler (all ASICs).
73 * The work gets scheduled from the IRQ handler if there
74 * was a hotplug interrupt. It walks through the connector table
75 * and calls hotplug handler for each connector. After this, it sends
76 * a DRM hotplug event to alert userspace.
77 *
78 * This design approach is required in order to defer hotplug event handling
79 * from the IRQ handler to a work handler because hotplug handler has to use
80 * mutexes which cannot be locked in an IRQ handler (since &mutex_lock may
81 * sleep).
82 */
83static void amdgpu_hotplug_work_func(struct work_struct *work)
84{
85 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
86 hotplug_work);
87 struct drm_device *dev = adev->ddev;
88 struct drm_mode_config *mode_config = &dev->mode_config;
89 struct drm_connector *connector;
90
91 mutex_lock(&mode_config->mutex);
92 list_for_each_entry(connector, &mode_config->connector_list, head)
93 amdgpu_connector_hotplug(connector);
94 mutex_unlock(&mode_config->mutex);
95 /* Just fire off a uevent and let userspace tell us what to do */
96 drm_helper_hpd_irq_event(dev);
97}
98
99/**
100 * amdgpu_irq_disable_all - disable *all* interrupts
101 *
102 * @adev: amdgpu device pointer
103 *
104 * Disable all types of interrupts from all sources.
105 */
106void amdgpu_irq_disable_all(struct amdgpu_device *adev)
107{
108 unsigned long irqflags;
109 unsigned i, j, k;
110 int r;
111
112 spin_lock_irqsave(&adev->irq.lock, irqflags);
113 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
114 if (!adev->irq.client[i].sources)
115 continue;
116
117 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
118 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
119
120 if (!src || !src->funcs->set || !src->num_types)
121 continue;
122
123 for (k = 0; k < src->num_types; ++k) {
124 atomic_set(&src->enabled_types[k], 0);
125 r = src->funcs->set(adev, src, k,
126 AMDGPU_IRQ_STATE_DISABLE);
127 if (r)
128 DRM_ERROR("error disabling interrupt (%d)\n",
129 r);
130 }
131 }
132 }
133 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
134}
135
136/**
137 * amdgpu_irq_handler - IRQ handler
138 *
139 * @irq: IRQ number (unused)
140 * @arg: pointer to DRM device
141 *
142 * IRQ handler for amdgpu driver (all ASICs).
143 *
144 * Returns:
145 * result of handling the IRQ, as defined by &irqreturn_t
146 */
147irqreturn_t amdgpu_irq_handler(int irq, void *arg)
148{
149 struct drm_device *dev = (struct drm_device *) arg;
150 struct amdgpu_device *adev = dev->dev_private;
151 irqreturn_t ret;
152
153 ret = amdgpu_ih_process(adev, &adev->irq.ih);
154 if (ret == IRQ_HANDLED)
155 pm_runtime_mark_last_busy(dev->dev);
156 return ret;
157}
158
159/**
160 * amdgpu_irq_handle_ih1 - kick of processing for IH1
161 *
162 * @work: work structure in struct amdgpu_irq
163 *
164 * Kick of processing IH ring 1.
165 */
166static void amdgpu_irq_handle_ih1(struct work_struct *work)
167{
168 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
169 irq.ih1_work);
170
171 amdgpu_ih_process(adev, &adev->irq.ih1);
172}
173
174/**
175 * amdgpu_irq_handle_ih2 - kick of processing for IH2
176 *
177 * @work: work structure in struct amdgpu_irq
178 *
179 * Kick of processing IH ring 2.
180 */
181static void amdgpu_irq_handle_ih2(struct work_struct *work)
182{
183 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
184 irq.ih2_work);
185
186 amdgpu_ih_process(adev, &adev->irq.ih2);
187}
188
189/**
190 * amdgpu_msi_ok - check whether MSI functionality is enabled
191 *
192 * @adev: amdgpu device pointer (unused)
193 *
194 * Checks whether MSI functionality has been disabled via module parameter
195 * (all ASICs).
196 *
197 * Returns:
198 * *true* if MSIs are allowed to be enabled or *false* otherwise
199 */
200static bool amdgpu_msi_ok(struct amdgpu_device *adev)
201{
202 if (amdgpu_msi == 1)
203 return true;
204 else if (amdgpu_msi == 0)
205 return false;
206
207 return true;
208}
209
210/**
211 * amdgpu_irq_init - initialize interrupt handling
212 *
213 * @adev: amdgpu device pointer
214 *
215 * Sets up work functions for hotplug and reset interrupts, enables MSI
216 * functionality, initializes vblank, hotplug and reset interrupt handling.
217 *
218 * Returns:
219 * 0 on success or error code on failure
220 */
221int amdgpu_irq_init(struct amdgpu_device *adev)
222{
223 int r = 0;
224
225 spin_lock_init(&adev->irq.lock);
226
227 /* Enable MSI if not disabled by module parameter */
228 adev->irq.msi_enabled = false;
229
230 if (amdgpu_msi_ok(adev)) {
231 int ret = pci_enable_msi(adev->pdev);
232 if (!ret) {
233 adev->irq.msi_enabled = true;
234 dev_dbg(adev->dev, "amdgpu: using MSI.\n");
235 }
236 }
237
238 if (!amdgpu_device_has_dc_support(adev)) {
239 if (!adev->enable_virtual_display)
240 /* Disable vblank IRQs aggressively for power-saving */
241 /* XXX: can this be enabled for DC? */
242 adev->ddev->vblank_disable_immediate = true;
243
244 r = drm_vblank_init(adev->ddev, adev->mode_info.num_crtc);
245 if (r)
246 return r;
247
248 /* Pre-DCE11 */
249 INIT_WORK(&adev->hotplug_work,
250 amdgpu_hotplug_work_func);
251 }
252
253 INIT_WORK(&adev->irq.ih1_work, amdgpu_irq_handle_ih1);
254 INIT_WORK(&adev->irq.ih2_work, amdgpu_irq_handle_ih2);
255
256 adev->irq.installed = true;
257 r = drm_irq_install(adev->ddev, adev->ddev->pdev->irq);
258 if (r) {
259 adev->irq.installed = false;
260 if (!amdgpu_device_has_dc_support(adev))
261 flush_work(&adev->hotplug_work);
262 return r;
263 }
264 adev->ddev->max_vblank_count = 0x00ffffff;
265
266 DRM_DEBUG("amdgpu: irq initialized.\n");
267 return 0;
268}
269
270/**
271 * amdgpu_irq_fini - shut down interrupt handling
272 *
273 * @adev: amdgpu device pointer
274 *
275 * Tears down work functions for hotplug and reset interrupts, disables MSI
276 * functionality, shuts down vblank, hotplug and reset interrupt handling,
277 * turns off interrupts from all sources (all ASICs).
278 */
279void amdgpu_irq_fini(struct amdgpu_device *adev)
280{
281 unsigned i, j;
282
283 if (adev->irq.installed) {
284 drm_irq_uninstall(adev->ddev);
285 adev->irq.installed = false;
286 if (adev->irq.msi_enabled)
287 pci_disable_msi(adev->pdev);
288 if (!amdgpu_device_has_dc_support(adev))
289 flush_work(&adev->hotplug_work);
290 }
291
292 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
293 if (!adev->irq.client[i].sources)
294 continue;
295
296 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
297 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
298
299 if (!src)
300 continue;
301
302 kfree(src->enabled_types);
303 src->enabled_types = NULL;
304 if (src->data) {
305 kfree(src->data);
306 kfree(src);
307 adev->irq.client[i].sources[j] = NULL;
308 }
309 }
310 kfree(adev->irq.client[i].sources);
311 adev->irq.client[i].sources = NULL;
312 }
313}
314
315/**
316 * amdgpu_irq_add_id - register IRQ source
317 *
318 * @adev: amdgpu device pointer
319 * @client_id: client id
320 * @src_id: source id
321 * @source: IRQ source pointer
322 *
323 * Registers IRQ source on a client.
324 *
325 * Returns:
326 * 0 on success or error code otherwise
327 */
328int amdgpu_irq_add_id(struct amdgpu_device *adev,
329 unsigned client_id, unsigned src_id,
330 struct amdgpu_irq_src *source)
331{
332 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX)
333 return -EINVAL;
334
335 if (src_id >= AMDGPU_MAX_IRQ_SRC_ID)
336 return -EINVAL;
337
338 if (!source->funcs)
339 return -EINVAL;
340
341 if (!adev->irq.client[client_id].sources) {
342 adev->irq.client[client_id].sources =
343 kcalloc(AMDGPU_MAX_IRQ_SRC_ID,
344 sizeof(struct amdgpu_irq_src *),
345 GFP_KERNEL);
346 if (!adev->irq.client[client_id].sources)
347 return -ENOMEM;
348 }
349
350 if (adev->irq.client[client_id].sources[src_id] != NULL)
351 return -EINVAL;
352
353 if (source->num_types && !source->enabled_types) {
354 atomic_t *types;
355
356 types = kcalloc(source->num_types, sizeof(atomic_t),
357 GFP_KERNEL);
358 if (!types)
359 return -ENOMEM;
360
361 source->enabled_types = types;
362 }
363
364 adev->irq.client[client_id].sources[src_id] = source;
365 return 0;
366}
367
368/**
369 * amdgpu_irq_dispatch - dispatch IRQ to IP blocks
370 *
371 * @adev: amdgpu device pointer
372 * @entry: interrupt vector pointer
373 *
374 * Dispatches IRQ to IP blocks.
375 */
376void amdgpu_irq_dispatch(struct amdgpu_device *adev,
377 struct amdgpu_ih_ring *ih)
378{
379 u32 ring_index = ih->rptr >> 2;
380 struct amdgpu_iv_entry entry;
381 unsigned client_id, src_id;
382 struct amdgpu_irq_src *src;
383 bool handled = false;
384 int r;
385
386 entry.iv_entry = (const uint32_t *)&ih->ring[ring_index];
387 amdgpu_ih_decode_iv(adev, &entry);
388
389 trace_amdgpu_iv(ih - &adev->irq.ih, &entry);
390
391 client_id = entry.client_id;
392 src_id = entry.src_id;
393
394 if (client_id >= AMDGPU_IRQ_CLIENTID_MAX) {
395 DRM_DEBUG("Invalid client_id in IV: %d\n", client_id);
396
397 } else if (src_id >= AMDGPU_MAX_IRQ_SRC_ID) {
398 DRM_DEBUG("Invalid src_id in IV: %d\n", src_id);
399
400 } else if (adev->irq.virq[src_id]) {
401 generic_handle_irq(irq_find_mapping(adev->irq.domain, src_id));
402
403 } else if (!adev->irq.client[client_id].sources) {
404 DRM_DEBUG("Unregistered interrupt client_id: %d src_id: %d\n",
405 client_id, src_id);
406
407 } else if ((src = adev->irq.client[client_id].sources[src_id])) {
408 r = src->funcs->process(adev, src, &entry);
409 if (r < 0)
410 DRM_ERROR("error processing interrupt (%d)\n", r);
411 else if (r)
412 handled = true;
413
414 } else {
415 DRM_DEBUG("Unhandled interrupt src_id: %d\n", src_id);
416 }
417
418 /* Send it to amdkfd as well if it isn't already handled */
419 if (!handled)
420 amdgpu_amdkfd_interrupt(adev, entry.iv_entry);
421}
422
423/**
424 * amdgpu_irq_update - update hardware interrupt state
425 *
426 * @adev: amdgpu device pointer
427 * @src: interrupt source pointer
428 * @type: type of interrupt
429 *
430 * Updates interrupt state for the specific source (all ASICs).
431 */
432int amdgpu_irq_update(struct amdgpu_device *adev,
433 struct amdgpu_irq_src *src, unsigned type)
434{
435 unsigned long irqflags;
436 enum amdgpu_interrupt_state state;
437 int r;
438
439 spin_lock_irqsave(&adev->irq.lock, irqflags);
440
441 /* We need to determine after taking the lock, otherwise
442 we might disable just enabled interrupts again */
443 if (amdgpu_irq_enabled(adev, src, type))
444 state = AMDGPU_IRQ_STATE_ENABLE;
445 else
446 state = AMDGPU_IRQ_STATE_DISABLE;
447
448 r = src->funcs->set(adev, src, type, state);
449 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
450 return r;
451}
452
453/**
454 * amdgpu_irq_gpu_reset_resume_helper - update interrupt states on all sources
455 *
456 * @adev: amdgpu device pointer
457 *
458 * Updates state of all types of interrupts on all sources on resume after
459 * reset.
460 */
461void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev)
462{
463 int i, j, k;
464
465 for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
466 if (!adev->irq.client[i].sources)
467 continue;
468
469 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
470 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
471
472 if (!src)
473 continue;
474 for (k = 0; k < src->num_types; k++)
475 amdgpu_irq_update(adev, src, k);
476 }
477 }
478}
479
480/**
481 * amdgpu_irq_get - enable interrupt
482 *
483 * @adev: amdgpu device pointer
484 * @src: interrupt source pointer
485 * @type: type of interrupt
486 *
487 * Enables specified type of interrupt on the specified source (all ASICs).
488 *
489 * Returns:
490 * 0 on success or error code otherwise
491 */
492int amdgpu_irq_get(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
493 unsigned type)
494{
495 if (!adev->ddev->irq_enabled)
496 return -ENOENT;
497
498 if (type >= src->num_types)
499 return -EINVAL;
500
501 if (!src->enabled_types || !src->funcs->set)
502 return -EINVAL;
503
504 if (atomic_inc_return(&src->enabled_types[type]) == 1)
505 return amdgpu_irq_update(adev, src, type);
506
507 return 0;
508}
509
510/**
511 * amdgpu_irq_put - disable interrupt
512 *
513 * @adev: amdgpu device pointer
514 * @src: interrupt source pointer
515 * @type: type of interrupt
516 *
517 * Enables specified type of interrupt on the specified source (all ASICs).
518 *
519 * Returns:
520 * 0 on success or error code otherwise
521 */
522int amdgpu_irq_put(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
523 unsigned type)
524{
525 if (!adev->ddev->irq_enabled)
526 return -ENOENT;
527
528 if (type >= src->num_types)
529 return -EINVAL;
530
531 if (!src->enabled_types || !src->funcs->set)
532 return -EINVAL;
533
534 if (atomic_dec_and_test(&src->enabled_types[type]))
535 return amdgpu_irq_update(adev, src, type);
536
537 return 0;
538}
539
540/**
541 * amdgpu_irq_enabled - check whether interrupt is enabled or not
542 *
543 * @adev: amdgpu device pointer
544 * @src: interrupt source pointer
545 * @type: type of interrupt
546 *
547 * Checks whether the given type of interrupt is enabled on the given source.
548 *
549 * Returns:
550 * *true* if interrupt is enabled, *false* if interrupt is disabled or on
551 * invalid parameters
552 */
553bool amdgpu_irq_enabled(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
554 unsigned type)
555{
556 if (!adev->ddev->irq_enabled)
557 return false;
558
559 if (type >= src->num_types)
560 return false;
561
562 if (!src->enabled_types || !src->funcs->set)
563 return false;
564
565 return !!atomic_read(&src->enabled_types[type]);
566}
567
568/* XXX: Generic IRQ handling */
569static void amdgpu_irq_mask(struct irq_data *irqd)
570{
571 /* XXX */
572}
573
574static void amdgpu_irq_unmask(struct irq_data *irqd)
575{
576 /* XXX */
577}
578
579/* amdgpu hardware interrupt chip descriptor */
580static struct irq_chip amdgpu_irq_chip = {
581 .name = "amdgpu-ih",
582 .irq_mask = amdgpu_irq_mask,
583 .irq_unmask = amdgpu_irq_unmask,
584};
585
586/**
587 * amdgpu_irqdomain_map - create mapping between virtual and hardware IRQ numbers
588 *
589 * @d: amdgpu IRQ domain pointer (unused)
590 * @irq: virtual IRQ number
591 * @hwirq: hardware irq number
592 *
593 * Current implementation assigns simple interrupt handler to the given virtual
594 * IRQ.
595 *
596 * Returns:
597 * 0 on success or error code otherwise
598 */
599static int amdgpu_irqdomain_map(struct irq_domain *d,
600 unsigned int irq, irq_hw_number_t hwirq)
601{
602 if (hwirq >= AMDGPU_MAX_IRQ_SRC_ID)
603 return -EPERM;
604
605 irq_set_chip_and_handler(irq,
606 &amdgpu_irq_chip, handle_simple_irq);
607 return 0;
608}
609
610/* Implementation of methods for amdgpu IRQ domain */
611static const struct irq_domain_ops amdgpu_hw_irqdomain_ops = {
612 .map = amdgpu_irqdomain_map,
613};
614
615/**
616 * amdgpu_irq_add_domain - create a linear IRQ domain
617 *
618 * @adev: amdgpu device pointer
619 *
620 * Creates an IRQ domain for GPU interrupt sources
621 * that may be driven by another driver (e.g., ACP).
622 *
623 * Returns:
624 * 0 on success or error code otherwise
625 */
626int amdgpu_irq_add_domain(struct amdgpu_device *adev)
627{
628 adev->irq.domain = irq_domain_add_linear(NULL, AMDGPU_MAX_IRQ_SRC_ID,
629 &amdgpu_hw_irqdomain_ops, adev);
630 if (!adev->irq.domain) {
631 DRM_ERROR("GPU irq add domain failed\n");
632 return -ENODEV;
633 }
634
635 return 0;
636}
637
638/**
639 * amdgpu_irq_remove_domain - remove the IRQ domain
640 *
641 * @adev: amdgpu device pointer
642 *
643 * Removes the IRQ domain for GPU interrupt sources
644 * that may be driven by another driver (e.g., ACP).
645 */
646void amdgpu_irq_remove_domain(struct amdgpu_device *adev)
647{
648 if (adev->irq.domain) {
649 irq_domain_remove(adev->irq.domain);
650 adev->irq.domain = NULL;
651 }
652}
653
654/**
655 * amdgpu_irq_create_mapping - create mapping between domain Linux IRQs
656 *
657 * @adev: amdgpu device pointer
658 * @src_id: IH source id
659 *
660 * Creates mapping between a domain IRQ (GPU IH src id) and a Linux IRQ
661 * Use this for components that generate a GPU interrupt, but are driven
662 * by a different driver (e.g., ACP).
663 *
664 * Returns:
665 * Linux IRQ
666 */
667unsigned amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned src_id)
668{
669 adev->irq.virq[src_id] = irq_create_mapping(adev->irq.domain, src_id);
670
671 return adev->irq.virq[src_id];
672}