1/*
   2 * Copyright 2009 Jerome Glisse.
   3 * All Rights Reserved.
   4 *
   5 * Permission is hereby granted, free of charge, to any person obtaining a
   6 * copy of this software and associated documentation files (the
   7 * "Software"), to deal in the Software without restriction, including
   8 * without limitation the rights to use, copy, modify, merge, publish,
   9 * distribute, sub license, and/or sell copies of the Software, and to
  10 * permit persons to whom the Software is furnished to do so, subject to
  11 * the following conditions:
  12 *
  13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  16 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  17 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  18 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  19 * USE OR OTHER DEALINGS IN THE SOFTWARE.
  20 *
  21 * The above copyright notice and this permission notice (including the
  22 * next paragraph) shall be included in all copies or substantial portions
  23 * of the Software.
  24 *
  25 */
  26/*
  27 * Authors:
  28 *    Jerome Glisse <glisse@freedesktop.org>
  29 *    Dave Airlie
  30 */
  31#include <linux/seq_file.h>
  32#include <linux/atomic.h>
  33#include <linux/wait.h>
  34#include <linux/kref.h>
  35#include <linux/slab.h>
  36#include <linux/firmware.h>
  37#include <linux/pm_runtime.h>
  38
  39#include <drm/drm_drv.h>
  40#include "amdgpu.h"
  41#include "amdgpu_trace.h"
  42#include "amdgpu_reset.h"
  43
  44/*
 
  45 * Fences mark an event in the GPUs pipeline and are used
  46 * for GPU/CPU synchronization.  When the fence is written,
  47 * it is expected that all buffers associated with that fence
  48 * are no longer in use by the associated ring on the GPU and
  49 * that the relevant GPU caches have been flushed.
  50 */
  51
  52struct amdgpu_fence {
  53	struct dma_fence base;
  54
  55	/* RB, DMA, etc. */
  56	struct amdgpu_ring		*ring;
  57	ktime_t				start_timestamp;
  58};
  59
  60static struct kmem_cache *amdgpu_fence_slab;
 
  61
  62int amdgpu_fence_slab_init(void)
  63{
  64	amdgpu_fence_slab = KMEM_CACHE(amdgpu_fence, SLAB_HWCACHE_ALIGN);
  65	if (!amdgpu_fence_slab)
  66		return -ENOMEM;
  67	return 0;
  68}
  69
  70void amdgpu_fence_slab_fini(void)
  71{
  72	rcu_barrier();
  73	kmem_cache_destroy(amdgpu_fence_slab);
  74}
  75/*
  76 * Cast helper
  77 */
  78static const struct dma_fence_ops amdgpu_fence_ops;
  79static const struct dma_fence_ops amdgpu_job_fence_ops;
  80static inline struct amdgpu_fence *to_amdgpu_fence(struct dma_fence *f)
  81{
  82	struct amdgpu_fence *__f = container_of(f, struct amdgpu_fence, base);
  83
  84	if (__f->base.ops == &amdgpu_fence_ops ||
  85	    __f->base.ops == &amdgpu_job_fence_ops)
  86		return __f;
  87
  88	return NULL;
  89}
  90
  91/**
  92 * amdgpu_fence_write - write a fence value
  93 *
  94 * @ring: ring the fence is associated with
  95 * @seq: sequence number to write
  96 *
  97 * Writes a fence value to memory (all asics).
  98 */
  99static void amdgpu_fence_write(struct amdgpu_ring *ring, u32 seq)
 100{
 101	struct amdgpu_fence_driver *drv = &ring->fence_drv;
 102
 103	if (drv->cpu_addr)
 104		*drv->cpu_addr = cpu_to_le32(seq);
 105}
 106
 107/**
 108 * amdgpu_fence_read - read a fence value
 109 *
 110 * @ring: ring the fence is associated with
 111 *
 112 * Reads a fence value from memory (all asics).
 113 * Returns the value of the fence read from memory.
 114 */
 115static u32 amdgpu_fence_read(struct amdgpu_ring *ring)
 116{
 117	struct amdgpu_fence_driver *drv = &ring->fence_drv;
 118	u32 seq = 0;
 119
 120	if (drv->cpu_addr)
 121		seq = le32_to_cpu(*drv->cpu_addr);
 122	else
 123		seq = atomic_read(&drv->last_seq);
 124
 125	return seq;
 126}
 127
 128/**
 129 * amdgpu_fence_emit - emit a fence on the requested ring
 130 *
 131 * @ring: ring the fence is associated with
 132 * @f: resulting fence object
 133 * @job: job the fence is embedded in
 134 * @flags: flags to pass into the subordinate .emit_fence() call
 135 *
 136 * Emits a fence command on the requested ring (all asics).
 137 * Returns 0 on success, -ENOMEM on failure.
 138 */
 139int amdgpu_fence_emit(struct amdgpu_ring *ring, struct dma_fence **f, struct amdgpu_job *job,
 140		      unsigned int flags)
 141{
 142	struct amdgpu_device *adev = ring->adev;
 143	struct dma_fence *fence;
 144	struct amdgpu_fence *am_fence;
 145	struct dma_fence __rcu **ptr;
 146	uint32_t seq;
 147	int r;
 148
 149	if (job == NULL) {
 150		/* create a sperate hw fence */
 151		am_fence = kmem_cache_alloc(amdgpu_fence_slab, GFP_ATOMIC);
 152		if (am_fence == NULL)
 153			return -ENOMEM;
 154		fence = &am_fence->base;
 155		am_fence->ring = ring;
 156	} else {
 157		/* take use of job-embedded fence */
 158		fence = &job->hw_fence;
 159	}
 160
 161	seq = ++ring->fence_drv.sync_seq;
 162	if (job && job->job_run_counter) {
 163		/* reinit seq for resubmitted jobs */
 164		fence->seqno = seq;
 165		/* TO be inline with external fence creation and other drivers */
 166		dma_fence_get(fence);
 167	} else {
 168		if (job) {
 169			dma_fence_init(fence, &amdgpu_job_fence_ops,
 170				       &ring->fence_drv.lock,
 171				       adev->fence_context + ring->idx, seq);
 172			/* Against remove in amdgpu_job_{free, free_cb} */
 173			dma_fence_get(fence);
 174		} else {
 175			dma_fence_init(fence, &amdgpu_fence_ops,
 176				       &ring->fence_drv.lock,
 177				       adev->fence_context + ring->idx, seq);
 178		}
 179	}
 180
 181	amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr,
 182			       seq, flags | AMDGPU_FENCE_FLAG_INT);
 183	pm_runtime_get_noresume(adev_to_drm(adev)->dev);
 184	ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask];
 185	if (unlikely(rcu_dereference_protected(*ptr, 1))) {
 186		struct dma_fence *old;
 187
 188		rcu_read_lock();
 189		old = dma_fence_get_rcu_safe(ptr);
 190		rcu_read_unlock();
 191
 192		if (old) {
 193			r = dma_fence_wait(old, false);
 194			dma_fence_put(old);
 195			if (r)
 196				return r;
 197		}
 198	}
 199
 200	to_amdgpu_fence(fence)->start_timestamp = ktime_get();
 201
 
 202	/* This function can't be called concurrently anyway, otherwise
 203	 * emitting the fence would mess up the hardware ring buffer.
 204	 */
 205	rcu_assign_pointer(*ptr, dma_fence_get(fence));
 206
 207	*f = fence;
 208
 209	return 0;
 210}
 211
 212/**
 213 * amdgpu_fence_emit_polling - emit a fence on the requeste ring
 214 *
 215 * @ring: ring the fence is associated with
 216 * @s: resulting sequence number
 217 * @timeout: the timeout for waiting in usecs
 218 *
 219 * Emits a fence command on the requested ring (all asics).
 220 * Used For polling fence.
 221 * Returns 0 on success, -ENOMEM on failure.
 222 */
 223int amdgpu_fence_emit_polling(struct amdgpu_ring *ring, uint32_t *s,
 224			      uint32_t timeout)
 225{
 226	uint32_t seq;
 227	signed long r;
 228
 229	if (!s)
 230		return -EINVAL;
 231
 232	seq = ++ring->fence_drv.sync_seq;
 233	r = amdgpu_fence_wait_polling(ring,
 234				      seq - ring->fence_drv.num_fences_mask,
 235				      timeout);
 236	if (r < 1)
 237		return -ETIMEDOUT;
 238
 239	amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr,
 240			       seq, 0);
 241
 242	*s = seq;
 243
 244	return 0;
 245}
 246
 247/**
 248 * amdgpu_fence_schedule_fallback - schedule fallback check
 249 *
 250 * @ring: pointer to struct amdgpu_ring
 251 *
 252 * Start a timer as fallback to our interrupts.
 253 */
 254static void amdgpu_fence_schedule_fallback(struct amdgpu_ring *ring)
 255{
 256	mod_timer(&ring->fence_drv.fallback_timer,
 257		  jiffies + AMDGPU_FENCE_JIFFIES_TIMEOUT);
 258}
 259
 260/**
 261 * amdgpu_fence_process - check for fence activity
 262 *
 263 * @ring: pointer to struct amdgpu_ring
 264 *
 265 * Checks the current fence value and calculates the last
 266 * signalled fence value. Wakes the fence queue if the
 267 * sequence number has increased.
 268 *
 269 * Returns true if fence was processed
 270 */
 271bool amdgpu_fence_process(struct amdgpu_ring *ring)
 272{
 273	struct amdgpu_fence_driver *drv = &ring->fence_drv;
 274	struct amdgpu_device *adev = ring->adev;
 275	uint32_t seq, last_seq;
 
 276
 277	do {
 278		last_seq = atomic_read(&ring->fence_drv.last_seq);
 279		seq = amdgpu_fence_read(ring);
 280
 281	} while (atomic_cmpxchg(&drv->last_seq, last_seq, seq) != last_seq);
 282
 283	if (del_timer(&ring->fence_drv.fallback_timer) &&
 284	    seq != ring->fence_drv.sync_seq)
 285		amdgpu_fence_schedule_fallback(ring);
 286
 287	if (unlikely(seq == last_seq))
 288		return false;
 289
 290	last_seq &= drv->num_fences_mask;
 291	seq &= drv->num_fences_mask;
 292
 293	do {
 294		struct dma_fence *fence, **ptr;
 295
 296		++last_seq;
 297		last_seq &= drv->num_fences_mask;
 298		ptr = &drv->fences[last_seq];
 299
 300		/* There is always exactly one thread signaling this fence slot */
 301		fence = rcu_dereference_protected(*ptr, 1);
 302		RCU_INIT_POINTER(*ptr, NULL);
 303
 304		if (!fence)
 305			continue;
 306
 307		dma_fence_signal(fence);
 308		dma_fence_put(fence);
 309		pm_runtime_mark_last_busy(adev_to_drm(adev)->dev);
 310		pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
 311	} while (last_seq != seq);
 312
 313	return true;
 
 314}
 315
 316/**
 317 * amdgpu_fence_fallback - fallback for hardware interrupts
 318 *
 319 * @t: timer context used to obtain the pointer to ring structure
 320 *
 321 * Checks for fence activity.
 322 */
 323static void amdgpu_fence_fallback(struct timer_list *t)
 324{
 325	struct amdgpu_ring *ring = from_timer(ring, t,
 326					      fence_drv.fallback_timer);
 327
 328	if (amdgpu_fence_process(ring))
 329		DRM_WARN("Fence fallback timer expired on ring %s\n", ring->name);
 330}
 331
 332/**
 333 * amdgpu_fence_wait_empty - wait for all fences to signal
 334 *
 
 335 * @ring: ring index the fence is associated with
 336 *
 337 * Wait for all fences on the requested ring to signal (all asics).
 338 * Returns 0 if the fences have passed, error for all other cases.
 339 */
 340int amdgpu_fence_wait_empty(struct amdgpu_ring *ring)
 341{
 342	uint64_t seq = READ_ONCE(ring->fence_drv.sync_seq);
 343	struct dma_fence *fence, **ptr;
 344	int r;
 345
 346	if (!seq)
 347		return 0;
 348
 349	ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask];
 350	rcu_read_lock();
 351	fence = rcu_dereference(*ptr);
 352	if (!fence || !dma_fence_get_rcu(fence)) {
 353		rcu_read_unlock();
 354		return 0;
 355	}
 356	rcu_read_unlock();
 357
 358	r = dma_fence_wait(fence, false);
 359	dma_fence_put(fence);
 360	return r;
 361}
 362
 363/**
 364 * amdgpu_fence_wait_polling - busy wait for givn sequence number
 365 *
 366 * @ring: ring index the fence is associated with
 367 * @wait_seq: sequence number to wait
 368 * @timeout: the timeout for waiting in usecs
 369 *
 370 * Wait for all fences on the requested ring to signal (all asics).
 371 * Returns left time if no timeout, 0 or minus if timeout.
 372 */
 373signed long amdgpu_fence_wait_polling(struct amdgpu_ring *ring,
 374				      uint32_t wait_seq,
 375				      signed long timeout)
 376{
 377
 378	while ((int32_t)(wait_seq - amdgpu_fence_read(ring)) > 0 && timeout > 0) {
 379		udelay(2);
 380		timeout -= 2;
 381	}
 382	return timeout > 0 ? timeout : 0;
 383}
 384/**
 385 * amdgpu_fence_count_emitted - get the count of emitted fences
 386 *
 387 * @ring: ring the fence is associated with
 388 *
 389 * Get the number of fences emitted on the requested ring (all asics).
 390 * Returns the number of emitted fences on the ring.  Used by the
 391 * dynpm code to ring track activity.
 392 */
 393unsigned int amdgpu_fence_count_emitted(struct amdgpu_ring *ring)
 394{
 395	uint64_t emitted;
 396
 397	/* We are not protected by ring lock when reading the last sequence
 398	 * but it's ok to report slightly wrong fence count here.
 399	 */
 
 400	emitted = 0x100000000ull;
 401	emitted -= atomic_read(&ring->fence_drv.last_seq);
 402	emitted += READ_ONCE(ring->fence_drv.sync_seq);
 403	return lower_32_bits(emitted);
 404}
 405
 406/**
 407 * amdgpu_fence_last_unsignaled_time_us - the time fence emitted until now
 408 * @ring: ring the fence is associated with
 409 *
 410 * Find the earliest fence unsignaled until now, calculate the time delta
 411 * between the time fence emitted and now.
 412 */
 413u64 amdgpu_fence_last_unsignaled_time_us(struct amdgpu_ring *ring)
 414{
 415	struct amdgpu_fence_driver *drv = &ring->fence_drv;
 416	struct dma_fence *fence;
 417	uint32_t last_seq, sync_seq;
 418
 419	last_seq = atomic_read(&ring->fence_drv.last_seq);
 420	sync_seq = READ_ONCE(ring->fence_drv.sync_seq);
 421	if (last_seq == sync_seq)
 422		return 0;
 423
 424	++last_seq;
 425	last_seq &= drv->num_fences_mask;
 426	fence = drv->fences[last_seq];
 427	if (!fence)
 428		return 0;
 429
 430	return ktime_us_delta(ktime_get(),
 431		to_amdgpu_fence(fence)->start_timestamp);
 432}
 433
 434/**
 435 * amdgpu_fence_update_start_timestamp - update the timestamp of the fence
 436 * @ring: ring the fence is associated with
 437 * @seq: the fence seq number to update.
 438 * @timestamp: the start timestamp to update.
 439 *
 440 * The function called at the time the fence and related ib is about to
 441 * resubmit to gpu in MCBP scenario. Thus we do not consider race condition
 442 * with amdgpu_fence_process to modify the same fence.
 443 */
 444void amdgpu_fence_update_start_timestamp(struct amdgpu_ring *ring, uint32_t seq, ktime_t timestamp)
 445{
 446	struct amdgpu_fence_driver *drv = &ring->fence_drv;
 447	struct dma_fence *fence;
 448
 449	seq &= drv->num_fences_mask;
 450	fence = drv->fences[seq];
 451	if (!fence)
 452		return;
 453
 454	to_amdgpu_fence(fence)->start_timestamp = timestamp;
 455}
 456
 457/**
 458 * amdgpu_fence_driver_start_ring - make the fence driver
 459 * ready for use on the requested ring.
 460 *
 461 * @ring: ring to start the fence driver on
 462 * @irq_src: interrupt source to use for this ring
 463 * @irq_type: interrupt type to use for this ring
 464 *
 465 * Make the fence driver ready for processing (all asics).
 466 * Not all asics have all rings, so each asic will only
 467 * start the fence driver on the rings it has.
 468 * Returns 0 for success, errors for failure.
 469 */
 470int amdgpu_fence_driver_start_ring(struct amdgpu_ring *ring,
 471				   struct amdgpu_irq_src *irq_src,
 472				   unsigned int irq_type)
 473{
 474	struct amdgpu_device *adev = ring->adev;
 475	uint64_t index;
 476
 477	if (ring->funcs->type != AMDGPU_RING_TYPE_UVD) {
 478		ring->fence_drv.cpu_addr = ring->fence_cpu_addr;
 479		ring->fence_drv.gpu_addr = ring->fence_gpu_addr;
 480	} else {
 481		/* put fence directly behind firmware */
 482		index = ALIGN(adev->uvd.fw->size, 8);
 483		ring->fence_drv.cpu_addr = adev->uvd.inst[ring->me].cpu_addr + index;
 484		ring->fence_drv.gpu_addr = adev->uvd.inst[ring->me].gpu_addr + index;
 485	}
 486	amdgpu_fence_write(ring, atomic_read(&ring->fence_drv.last_seq));
 
 487
 488	ring->fence_drv.irq_src = irq_src;
 489	ring->fence_drv.irq_type = irq_type;
 490	ring->fence_drv.initialized = true;
 491
 492	DRM_DEV_DEBUG(adev->dev, "fence driver on ring %s use gpu addr 0x%016llx\n",
 493		      ring->name, ring->fence_drv.gpu_addr);
 
 494	return 0;
 495}
 496
 497/**
 498 * amdgpu_fence_driver_init_ring - init the fence driver
 499 * for the requested ring.
 500 *
 501 * @ring: ring to init the fence driver on
 
 502 *
 503 * Init the fence driver for the requested ring (all asics).
 504 * Helper function for amdgpu_fence_driver_init().
 505 */
 506int amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring)
 
 507{
 508	struct amdgpu_device *adev = ring->adev;
 509
 510	if (!adev)
 511		return -EINVAL;
 512
 513	if (!is_power_of_2(ring->num_hw_submission))
 
 514		return -EINVAL;
 515
 516	ring->fence_drv.cpu_addr = NULL;
 517	ring->fence_drv.gpu_addr = 0;
 518	ring->fence_drv.sync_seq = 0;
 519	atomic_set(&ring->fence_drv.last_seq, 0);
 520	ring->fence_drv.initialized = false;
 521
 522	timer_setup(&ring->fence_drv.fallback_timer, amdgpu_fence_fallback, 0);
 
 523
 524	ring->fence_drv.num_fences_mask = ring->num_hw_submission * 2 - 1;
 525	spin_lock_init(&ring->fence_drv.lock);
 526	ring->fence_drv.fences = kcalloc(ring->num_hw_submission * 2, sizeof(void *),
 527					 GFP_KERNEL);
 528
 529	if (!ring->fence_drv.fences)
 530		return -ENOMEM;
 531
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 532	return 0;
 533}
 534
 535/**
 536 * amdgpu_fence_driver_sw_init - init the fence driver
 537 * for all possible rings.
 538 *
 539 * @adev: amdgpu device pointer
 540 *
 541 * Init the fence driver for all possible rings (all asics).
 542 * Not all asics have all rings, so each asic will only
 543 * start the fence driver on the rings it has using
 544 * amdgpu_fence_driver_start_ring().
 545 * Returns 0 for success.
 546 */
 547int amdgpu_fence_driver_sw_init(struct amdgpu_device *adev)
 548{
 549	return 0;
 550}
 551
 552/**
 553 * amdgpu_fence_need_ring_interrupt_restore - helper function to check whether
 554 * fence driver interrupts need to be restored.
 555 *
 556 * @ring: ring that to be checked
 557 *
 558 * Interrupts for rings that belong to GFX IP don't need to be restored
 559 * when the target power state is s0ix.
 560 *
 561 * Return true if need to restore interrupts, false otherwise.
 562 */
 563static bool amdgpu_fence_need_ring_interrupt_restore(struct amdgpu_ring *ring)
 564{
 565	struct amdgpu_device *adev = ring->adev;
 566	bool is_gfx_power_domain = false;
 567
 568	switch (ring->funcs->type) {
 569	case AMDGPU_RING_TYPE_SDMA:
 570	/* SDMA 5.x+ is part of GFX power domain so it's covered by GFXOFF */
 571		if (amdgpu_ip_version(adev, SDMA0_HWIP, 0) >=
 572		    IP_VERSION(5, 0, 0))
 573			is_gfx_power_domain = true;
 574		break;
 575	case AMDGPU_RING_TYPE_GFX:
 576	case AMDGPU_RING_TYPE_COMPUTE:
 577	case AMDGPU_RING_TYPE_KIQ:
 578	case AMDGPU_RING_TYPE_MES:
 579		is_gfx_power_domain = true;
 580		break;
 581	default:
 582		break;
 583	}
 
 
 584
 585	return !(adev->in_s0ix && is_gfx_power_domain);
 586}
 587
 588/**
 589 * amdgpu_fence_driver_hw_fini - tear down the fence driver
 590 * for all possible rings.
 591 *
 592 * @adev: amdgpu device pointer
 593 *
 594 * Tear down the fence driver for all possible rings (all asics).
 595 */
 596void amdgpu_fence_driver_hw_fini(struct amdgpu_device *adev)
 597{
 598	int i, r;
 
 599
 600	for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 601		struct amdgpu_ring *ring = adev->rings[i];
 602
 603		if (!ring || !ring->fence_drv.initialized)
 604			continue;
 605
 606		/* You can't wait for HW to signal if it's gone */
 607		if (!drm_dev_is_unplugged(adev_to_drm(adev)))
 608			r = amdgpu_fence_wait_empty(ring);
 609		else
 610			r = -ENODEV;
 611		/* no need to trigger GPU reset as we are unloading */
 612		if (r)
 613			amdgpu_fence_driver_force_completion(ring);
 614
 615		if (!drm_dev_is_unplugged(adev_to_drm(adev)) &&
 616		    ring->fence_drv.irq_src &&
 617		    amdgpu_fence_need_ring_interrupt_restore(ring))
 618			amdgpu_irq_put(adev, ring->fence_drv.irq_src,
 619				       ring->fence_drv.irq_type);
 620
 621		del_timer_sync(&ring->fence_drv.fallback_timer);
 
 
 
 
 622	}
 623}
 624
 625/* Will either stop and flush handlers for amdgpu interrupt or reanble it */
 626void amdgpu_fence_driver_isr_toggle(struct amdgpu_device *adev, bool stop)
 627{
 628	int i;
 629
 630	for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 631		struct amdgpu_ring *ring = adev->rings[i];
 632
 633		if (!ring || !ring->fence_drv.initialized || !ring->fence_drv.irq_src)
 634			continue;
 635
 636		if (stop)
 637			disable_irq(adev->irq.irq);
 638		else
 639			enable_irq(adev->irq.irq);
 640	}
 641}
 642
 643void amdgpu_fence_driver_sw_fini(struct amdgpu_device *adev)
 
 
 
 
 
 
 
 
 644{
 645	unsigned int i, j;
 646
 647	for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 648		struct amdgpu_ring *ring = adev->rings[i];
 649
 650		if (!ring || !ring->fence_drv.initialized)
 651			continue;
 652
 653		/*
 654		 * Notice we check for sched.ops since there's some
 655		 * override on the meaning of sched.ready by amdgpu.
 656		 * The natural check would be sched.ready, which is
 657		 * set as drm_sched_init() finishes...
 658		 */
 659		if (ring->sched.ops)
 660			drm_sched_fini(&ring->sched);
 661
 662		for (j = 0; j <= ring->fence_drv.num_fences_mask; ++j)
 663			dma_fence_put(ring->fence_drv.fences[j]);
 664		kfree(ring->fence_drv.fences);
 665		ring->fence_drv.fences = NULL;
 666		ring->fence_drv.initialized = false;
 667	}
 668}
 669
 670/**
 671 * amdgpu_fence_driver_hw_init - enable the fence driver
 672 * for all possible rings.
 673 *
 674 * @adev: amdgpu device pointer
 675 *
 676 * Enable the fence driver for all possible rings (all asics).
 677 * Not all asics have all rings, so each asic will only
 678 * start the fence driver on the rings it has using
 679 * amdgpu_fence_driver_start_ring().
 680 * Returns 0 for success.
 681 */
 682void amdgpu_fence_driver_hw_init(struct amdgpu_device *adev)
 683{
 684	int i;
 685
 686	for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 687		struct amdgpu_ring *ring = adev->rings[i];
 688
 689		if (!ring || !ring->fence_drv.initialized)
 690			continue;
 691
 692		/* enable the interrupt */
 693		if (ring->fence_drv.irq_src &&
 694		    amdgpu_fence_need_ring_interrupt_restore(ring))
 695			amdgpu_irq_get(adev, ring->fence_drv.irq_src,
 696				       ring->fence_drv.irq_type);
 697	}
 698}
 699
 700/**
 701 * amdgpu_fence_driver_clear_job_fences - clear job embedded fences of ring
 702 *
 703 * @ring: fence of the ring to be cleared
 704 *
 
 
 705 */
 706void amdgpu_fence_driver_clear_job_fences(struct amdgpu_ring *ring)
 707{
 708	int i;
 709	struct dma_fence *old, **ptr;
 710
 711	for (i = 0; i <= ring->fence_drv.num_fences_mask; i++) {
 712		ptr = &ring->fence_drv.fences[i];
 713		old = rcu_dereference_protected(*ptr, 1);
 714		if (old && old->ops == &amdgpu_job_fence_ops) {
 715			struct amdgpu_job *job;
 716
 717			/* For non-scheduler bad job, i.e. failed ib test, we need to signal
 718			 * it right here or we won't be able to track them in fence_drv
 719			 * and they will remain unsignaled during sa_bo free.
 720			 */
 721			job = container_of(old, struct amdgpu_job, hw_fence);
 722			if (!job->base.s_fence && !dma_fence_is_signaled(old))
 723				dma_fence_signal(old);
 724			RCU_INIT_POINTER(*ptr, NULL);
 725			dma_fence_put(old);
 726		}
 727	}
 728}
 729
 730/**
 731 * amdgpu_fence_driver_set_error - set error code on fences
 732 * @ring: the ring which contains the fences
 733 * @error: the error code to set
 734 *
 735 * Set an error code to all the fences pending on the ring.
 736 */
 737void amdgpu_fence_driver_set_error(struct amdgpu_ring *ring, int error)
 738{
 739	struct amdgpu_fence_driver *drv = &ring->fence_drv;
 740	unsigned long flags;
 741
 742	spin_lock_irqsave(&drv->lock, flags);
 743	for (unsigned int i = 0; i <= drv->num_fences_mask; ++i) {
 744		struct dma_fence *fence;
 
 745
 746		fence = rcu_dereference_protected(drv->fences[i],
 747						  lockdep_is_held(&drv->lock));
 748		if (fence && !dma_fence_is_signaled_locked(fence))
 749			dma_fence_set_error(fence, error);
 750	}
 751	spin_unlock_irqrestore(&drv->lock, flags);
 752}
 753
 754/**
 755 * amdgpu_fence_driver_force_completion - force signal latest fence of ring
 756 *
 757 * @ring: fence of the ring to signal
 758 *
 759 */
 760void amdgpu_fence_driver_force_completion(struct amdgpu_ring *ring)
 761{
 762	amdgpu_fence_driver_set_error(ring, -ECANCELED);
 763	amdgpu_fence_write(ring, ring->fence_drv.sync_seq);
 764	amdgpu_fence_process(ring);
 765}
 766
 767/*
 768 * Common fence implementation
 769 */
 770
 771static const char *amdgpu_fence_get_driver_name(struct dma_fence *fence)
 772{
 773	return "amdgpu";
 774}
 775
 776static const char *amdgpu_fence_get_timeline_name(struct dma_fence *f)
 777{
 778	return (const char *)to_amdgpu_fence(f)->ring->name;
 779}
 780
 781static const char *amdgpu_job_fence_get_timeline_name(struct dma_fence *f)
 782{
 783	struct amdgpu_job *job = container_of(f, struct amdgpu_job, hw_fence);
 784
 785	return (const char *)to_amdgpu_ring(job->base.sched)->name;
 786}
 787
 788/**
 789 * amdgpu_fence_enable_signaling - enable signalling on fence
 790 * @f: fence
 791 *
 792 * This function is called with fence_queue lock held, and adds a callback
 793 * to fence_queue that checks if this fence is signaled, and if so it
 794 * signals the fence and removes itself.
 795 */
 796static bool amdgpu_fence_enable_signaling(struct dma_fence *f)
 797{
 798	if (!timer_pending(&to_amdgpu_fence(f)->ring->fence_drv.fallback_timer))
 799		amdgpu_fence_schedule_fallback(to_amdgpu_fence(f)->ring);
 800
 801	return true;
 802}
 803
 804/**
 805 * amdgpu_job_fence_enable_signaling - enable signalling on job fence
 806 * @f: fence
 807 *
 808 * This is the simliar function with amdgpu_fence_enable_signaling above, it
 809 * only handles the job embedded fence.
 810 */
 811static bool amdgpu_job_fence_enable_signaling(struct dma_fence *f)
 812{
 813	struct amdgpu_job *job = container_of(f, struct amdgpu_job, hw_fence);
 814
 815	if (!timer_pending(&to_amdgpu_ring(job->base.sched)->fence_drv.fallback_timer))
 816		amdgpu_fence_schedule_fallback(to_amdgpu_ring(job->base.sched));
 817
 818	return true;
 819}
 820
 821/**
 822 * amdgpu_fence_free - free up the fence memory
 823 *
 824 * @rcu: RCU callback head
 825 *
 826 * Free up the fence memory after the RCU grace period.
 827 */
 828static void amdgpu_fence_free(struct rcu_head *rcu)
 829{
 830	struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
 831
 832	/* free fence_slab if it's separated fence*/
 833	kmem_cache_free(amdgpu_fence_slab, to_amdgpu_fence(f));
 834}
 835
 836/**
 837 * amdgpu_job_fence_free - free up the job with embedded fence
 838 *
 839 * @rcu: RCU callback head
 840 *
 841 * Free up the job with embedded fence after the RCU grace period.
 842 */
 843static void amdgpu_job_fence_free(struct rcu_head *rcu)
 844{
 845	struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
 846
 847	/* free job if fence has a parent job */
 848	kfree(container_of(f, struct amdgpu_job, hw_fence));
 849}
 850
 851/**
 852 * amdgpu_fence_release - callback that fence can be freed
 853 *
 854 * @f: fence
 855 *
 856 * This function is called when the reference count becomes zero.
 857 * It just RCU schedules freeing up the fence.
 858 */
 859static void amdgpu_fence_release(struct dma_fence *f)
 860{
 861	call_rcu(&f->rcu, amdgpu_fence_free);
 862}
 863
 864/**
 865 * amdgpu_job_fence_release - callback that job embedded fence can be freed
 866 *
 867 * @f: fence
 868 *
 869 * This is the simliar function with amdgpu_fence_release above, it
 870 * only handles the job embedded fence.
 871 */
 872static void amdgpu_job_fence_release(struct dma_fence *f)
 873{
 874	call_rcu(&f->rcu, amdgpu_job_fence_free);
 875}
 876
 877static const struct dma_fence_ops amdgpu_fence_ops = {
 878	.get_driver_name = amdgpu_fence_get_driver_name,
 879	.get_timeline_name = amdgpu_fence_get_timeline_name,
 880	.enable_signaling = amdgpu_fence_enable_signaling,
 
 881	.release = amdgpu_fence_release,
 882};
 883
 884static const struct dma_fence_ops amdgpu_job_fence_ops = {
 885	.get_driver_name = amdgpu_fence_get_driver_name,
 886	.get_timeline_name = amdgpu_job_fence_get_timeline_name,
 887	.enable_signaling = amdgpu_job_fence_enable_signaling,
 888	.release = amdgpu_job_fence_release,
 889};
 890
 891/*
 892 * Fence debugfs
 893 */
 894#if defined(CONFIG_DEBUG_FS)
 895static int amdgpu_debugfs_fence_info_show(struct seq_file *m, void *unused)
 896{
 897	struct amdgpu_device *adev = m->private;
 
 
 898	int i;
 899
 900	for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 901		struct amdgpu_ring *ring = adev->rings[i];
 902
 903		if (!ring || !ring->fence_drv.initialized)
 904			continue;
 905
 906		amdgpu_fence_process(ring);
 907
 908		seq_printf(m, "--- ring %d (%s) ---\n", i, ring->name);
 909		seq_printf(m, "Last signaled fence          0x%08x\n",
 910			   atomic_read(&ring->fence_drv.last_seq));
 911		seq_printf(m, "Last emitted                 0x%08x\n",
 912			   ring->fence_drv.sync_seq);
 913
 914		if (ring->funcs->type == AMDGPU_RING_TYPE_GFX ||
 915		    ring->funcs->type == AMDGPU_RING_TYPE_SDMA) {
 916			seq_printf(m, "Last signaled trailing fence 0x%08x\n",
 917				   le32_to_cpu(*ring->trail_fence_cpu_addr));
 918			seq_printf(m, "Last emitted                 0x%08x\n",
 919				   ring->trail_seq);
 920		}
 921
 922		if (ring->funcs->type != AMDGPU_RING_TYPE_GFX)
 923			continue;
 924
 925		/* set in CP_VMID_PREEMPT and preemption occurred */
 926		seq_printf(m, "Last preempted               0x%08x\n",
 927			   le32_to_cpu(*(ring->fence_drv.cpu_addr + 2)));
 928		/* set in CP_VMID_RESET and reset occurred */
 929		seq_printf(m, "Last reset                   0x%08x\n",
 930			   le32_to_cpu(*(ring->fence_drv.cpu_addr + 4)));
 931		/* Both preemption and reset occurred */
 932		seq_printf(m, "Last both                    0x%08x\n",
 933			   le32_to_cpu(*(ring->fence_drv.cpu_addr + 6)));
 934	}
 935	return 0;
 936}
 937
 938/*
 939 * amdgpu_debugfs_gpu_recover - manually trigger a gpu reset & recover
 940 *
 941 * Manually trigger a gpu reset at the next fence wait.
 942 */
 943static int gpu_recover_get(void *data, u64 *val)
 944{
 945	struct amdgpu_device *adev = (struct amdgpu_device *)data;
 946	struct drm_device *dev = adev_to_drm(adev);
 947	int r;
 948
 949	r = pm_runtime_get_sync(dev->dev);
 950	if (r < 0) {
 951		pm_runtime_put_autosuspend(dev->dev);
 952		return 0;
 953	}
 954
 955	if (amdgpu_reset_domain_schedule(adev->reset_domain, &adev->reset_work))
 956		flush_work(&adev->reset_work);
 957
 958	*val = atomic_read(&adev->reset_domain->reset_res);
 959
 960	pm_runtime_mark_last_busy(dev->dev);
 961	pm_runtime_put_autosuspend(dev->dev);
 962
 963	return 0;
 964}
 965
 966DEFINE_SHOW_ATTRIBUTE(amdgpu_debugfs_fence_info);
 967DEFINE_DEBUGFS_ATTRIBUTE(amdgpu_debugfs_gpu_recover_fops, gpu_recover_get, NULL,
 968			 "%lld\n");
 969
 970static void amdgpu_debugfs_reset_work(struct work_struct *work)
 971{
 972	struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
 973						  reset_work);
 974
 975	struct amdgpu_reset_context reset_context;
 976
 977	memset(&reset_context, 0, sizeof(reset_context));
 978
 979	reset_context.method = AMD_RESET_METHOD_NONE;
 980	reset_context.reset_req_dev = adev;
 981	reset_context.src = AMDGPU_RESET_SRC_USER;
 982	set_bit(AMDGPU_NEED_FULL_RESET, &reset_context.flags);
 983	set_bit(AMDGPU_SKIP_COREDUMP, &reset_context.flags);
 984
 985	amdgpu_device_gpu_recover(adev, NULL, &reset_context);
 986}
 987
 988#endif
 989
 990void amdgpu_debugfs_fence_init(struct amdgpu_device *adev)
 991{
 992#if defined(CONFIG_DEBUG_FS)
 993	struct drm_minor *minor = adev_to_drm(adev)->primary;
 994	struct dentry *root = minor->debugfs_root;
 995
 996	debugfs_create_file("amdgpu_fence_info", 0444, root, adev,
 997			    &amdgpu_debugfs_fence_info_fops);
 998
 999	if (!amdgpu_sriov_vf(adev)) {
1000
1001		INIT_WORK(&adev->reset_work, amdgpu_debugfs_reset_work);
1002		debugfs_create_file("amdgpu_gpu_recover", 0444, root, adev,
1003				    &amdgpu_debugfs_gpu_recover_fops);
1004	}
1005#endif
1006}
1007