vmwgfx_fence.c 29.8 KB
Newer Older
1 2
/**************************************************************************
 *
S
Sinclair Yeh 已提交
3
 * Copyright © 2011-2014 VMware, Inc., Palo Alto, CA., USA
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/

28
#include <drm/drmP.h>
29 30 31 32 33 34 35 36 37
#include "vmwgfx_drv.h"

#define VMW_FENCE_WRAP (1 << 31)

struct vmw_fence_manager {
	int num_fence_objects;
	struct vmw_private *dev_priv;
	spinlock_t lock;
	struct list_head fence_list;
38
	struct work_struct work;
39 40
	u32 user_fence_size;
	u32 fence_size;
T
Thomas Hellstrom 已提交
41
	u32 event_fence_action_size;
42 43
	bool fifo_down;
	struct list_head cleanup_list;
T
Thomas Hellstrom 已提交
44 45 46 47 48
	uint32_t pending_actions[VMW_ACTION_MAX];
	struct mutex goal_irq_mutex;
	bool goal_irq_on; /* Protected by @goal_irq_mutex */
	bool seqno_valid; /* Protected by @lock, and may not be set to true
			     without the @goal_irq_mutex held. */
49
	u64 ctx;
50 51 52 53 54 55 56 57
};

struct vmw_user_fence {
	struct ttm_base_object base;
	struct vmw_fence_obj fence;
};

/**
T
Thomas Hellstrom 已提交
58
 * struct vmw_event_fence_action - fence action that delivers a drm event.
59
 *
T
Thomas Hellstrom 已提交
60 61 62 63 64 65 66 67 68 69 70 71 72 73
 * @e: A struct drm_pending_event that controls the event delivery.
 * @action: A struct vmw_fence_action to hook up to a fence.
 * @fence: A referenced pointer to the fence to keep it alive while @action
 * hangs on it.
 * @dev: Pointer to a struct drm_device so we can access the event stuff.
 * @kref: Both @e and @action has destructors, so we need to refcount.
 * @size: Size accounted for this object.
 * @tv_sec: If non-null, the variable pointed to will be assigned
 * current time tv_sec val when the fence signals.
 * @tv_usec: Must be set if @tv_sec is set, and the variable pointed to will
 * be assigned the current time tv_usec val when the fence signals.
 */
struct vmw_event_fence_action {
	struct vmw_fence_action action;
74 75

	struct drm_pending_event *event;
T
Thomas Hellstrom 已提交
76 77
	struct vmw_fence_obj *fence;
	struct drm_device *dev;
78

T
Thomas Hellstrom 已提交
79 80 81 82
	uint32_t *tv_sec;
	uint32_t *tv_usec;
};

83 84 85 86 87 88
static struct vmw_fence_manager *
fman_from_fence(struct vmw_fence_obj *fence)
{
	return container_of(fence->base.lock, struct vmw_fence_manager, lock);
}

T
Thomas Hellstrom 已提交
89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108
/**
 * Note on fencing subsystem usage of irqs:
 * Typically the vmw_fences_update function is called
 *
 * a) When a new fence seqno has been submitted by the fifo code.
 * b) On-demand when we have waiters. Sleeping waiters will switch on the
 * ANY_FENCE irq and call vmw_fences_update function each time an ANY_FENCE
 * irq is received. When the last fence waiter is gone, that IRQ is masked
 * away.
 *
 * In situations where there are no waiters and we don't submit any new fences,
 * fence objects may not be signaled. This is perfectly OK, since there are
 * no consumers of the signaled data, but that is NOT ok when there are fence
 * actions attached to a fence. The fencing subsystem then makes use of the
 * FENCE_GOAL irq and sets the fence goal seqno to that of the next fence
 * which has an action attached, and each time vmw_fences_update is called,
 * the subsystem makes sure the fence goal seqno is updated.
 *
 * The fence goal seqno irq is on as long as there are unsignaled fence
 * objects with actions attached to them.
109 110
 */

111
static void vmw_fence_obj_destroy(struct dma_fence *f)
112 113
{
	struct vmw_fence_obj *fence =
114
		container_of(f, struct vmw_fence_obj, base);
115

116 117
	struct vmw_fence_manager *fman = fman_from_fence(fence);
	unsigned long irq_flags;
118

119
	spin_lock_irqsave(&fman->lock, irq_flags);
120
	list_del_init(&fence->head);
121 122 123 124
	--fman->num_fence_objects;
	spin_unlock_irqrestore(&fman->lock, irq_flags);
	fence->destroy(fence);
}
125

126
static const char *vmw_fence_get_driver_name(struct dma_fence *f)
127 128 129 130
{
	return "vmwgfx";
}

131
static const char *vmw_fence_get_timeline_name(struct dma_fence *f)
132 133
{
	return "svga";
134 135
}

136
static bool vmw_fence_enable_signaling(struct dma_fence *f)
137 138 139 140 141 142 143
{
	struct vmw_fence_obj *fence =
		container_of(f, struct vmw_fence_obj, base);

	struct vmw_fence_manager *fman = fman_from_fence(fence);
	struct vmw_private *dev_priv = fman->dev_priv;

144 145
	u32 *fifo_mem = dev_priv->mmio_virt;
	u32 seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE);
146 147 148
	if (seqno - fence->base.seqno < VMW_FENCE_WRAP)
		return false;

149
	vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
150 151 152 153 154

	return true;
}

struct vmwgfx_wait_cb {
155
	struct dma_fence_cb base;
156 157 158 159
	struct task_struct *task;
};

static void
160
vmwgfx_wait_cb(struct dma_fence *fence, struct dma_fence_cb *cb)
161 162 163 164 165 166 167 168 169
{
	struct vmwgfx_wait_cb *wait =
		container_of(cb, struct vmwgfx_wait_cb, base);

	wake_up_process(wait->task);
}

static void __vmw_fences_update(struct vmw_fence_manager *fman);

170
static long vmw_fence_wait(struct dma_fence *f, bool intr, signed long timeout)
171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199
{
	struct vmw_fence_obj *fence =
		container_of(f, struct vmw_fence_obj, base);

	struct vmw_fence_manager *fman = fman_from_fence(fence);
	struct vmw_private *dev_priv = fman->dev_priv;
	struct vmwgfx_wait_cb cb;
	long ret = timeout;
	unsigned long irq_flags;

	if (likely(vmw_fence_obj_signaled(fence)))
		return timeout;

	vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
	vmw_seqno_waiter_add(dev_priv);

	spin_lock_irqsave(f->lock, irq_flags);

	if (intr && signal_pending(current)) {
		ret = -ERESTARTSYS;
		goto out;
	}

	cb.base.func = vmwgfx_wait_cb;
	cb.task = current;
	list_add(&cb.base.node, &f->cb_list);

	while (ret > 0) {
		__vmw_fences_update(fman);
200
		if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &f->flags))
201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227
			break;

		if (intr)
			__set_current_state(TASK_INTERRUPTIBLE);
		else
			__set_current_state(TASK_UNINTERRUPTIBLE);
		spin_unlock_irqrestore(f->lock, irq_flags);

		ret = schedule_timeout(ret);

		spin_lock_irqsave(f->lock, irq_flags);
		if (ret > 0 && intr && signal_pending(current))
			ret = -ERESTARTSYS;
	}

	if (!list_empty(&cb.base.node))
		list_del(&cb.base.node);
	__set_current_state(TASK_RUNNING);

out:
	spin_unlock_irqrestore(f->lock, irq_flags);

	vmw_seqno_waiter_remove(dev_priv);

	return ret;
}

228
static struct dma_fence_ops vmw_fence_ops = {
229 230 231 232 233 234 235
	.get_driver_name = vmw_fence_get_driver_name,
	.get_timeline_name = vmw_fence_get_timeline_name,
	.enable_signaling = vmw_fence_enable_signaling,
	.wait = vmw_fence_wait,
	.release = vmw_fence_obj_destroy,
};

236 237 238 239 240 241 242 243 244 245 246 247 248

/**
 * Execute signal actions on fences recently signaled.
 * This is done from a workqueue so we don't have to execute
 * signal actions from atomic context.
 */

static void vmw_fence_work_func(struct work_struct *work)
{
	struct vmw_fence_manager *fman =
		container_of(work, struct vmw_fence_manager, work);
	struct list_head list;
	struct vmw_fence_action *action, *next_action;
T
Thomas Hellstrom 已提交
249
	bool seqno_valid;
250 251 252

	do {
		INIT_LIST_HEAD(&list);
T
Thomas Hellstrom 已提交
253 254
		mutex_lock(&fman->goal_irq_mutex);

255 256
		spin_lock_irq(&fman->lock);
		list_splice_init(&fman->cleanup_list, &list);
T
Thomas Hellstrom 已提交
257
		seqno_valid = fman->seqno_valid;
258 259
		spin_unlock_irq(&fman->lock);

T
Thomas Hellstrom 已提交
260 261 262 263 264 265
		if (!seqno_valid && fman->goal_irq_on) {
			fman->goal_irq_on = false;
			vmw_goal_waiter_remove(fman->dev_priv);
		}
		mutex_unlock(&fman->goal_irq_mutex);

266 267 268 269 270 271
		if (list_empty(&list))
			return;

		/*
		 * At this point, only we should be able to manipulate the
		 * list heads of the actions we have on the private list.
T
Thomas Hellstrom 已提交
272
		 * hence fman::lock not held.
273 274 275 276
		 */

		list_for_each_entry_safe(action, next_action, &list, head) {
			list_del_init(&action->head);
T
Thomas Hellstrom 已提交
277 278
			if (action->cleanup)
				action->cleanup(action);
279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297
		}
	} while (1);
}

struct vmw_fence_manager *vmw_fence_manager_init(struct vmw_private *dev_priv)
{
	struct vmw_fence_manager *fman = kzalloc(sizeof(*fman), GFP_KERNEL);

	if (unlikely(fman == NULL))
		return NULL;

	fman->dev_priv = dev_priv;
	spin_lock_init(&fman->lock);
	INIT_LIST_HEAD(&fman->fence_list);
	INIT_LIST_HEAD(&fman->cleanup_list);
	INIT_WORK(&fman->work, &vmw_fence_work_func);
	fman->fifo_down = true;
	fman->user_fence_size = ttm_round_pot(sizeof(struct vmw_user_fence));
	fman->fence_size = ttm_round_pot(sizeof(struct vmw_fence_obj));
T
Thomas Hellstrom 已提交
298 299 300
	fman->event_fence_action_size =
		ttm_round_pot(sizeof(struct vmw_event_fence_action));
	mutex_init(&fman->goal_irq_mutex);
301
	fman->ctx = dma_fence_context_alloc(1);
302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322

	return fman;
}

void vmw_fence_manager_takedown(struct vmw_fence_manager *fman)
{
	unsigned long irq_flags;
	bool lists_empty;

	(void) cancel_work_sync(&fman->work);

	spin_lock_irqsave(&fman->lock, irq_flags);
	lists_empty = list_empty(&fman->fence_list) &&
		list_empty(&fman->cleanup_list);
	spin_unlock_irqrestore(&fman->lock, irq_flags);

	BUG_ON(!lists_empty);
	kfree(fman);
}

static int vmw_fence_obj_init(struct vmw_fence_manager *fman,
323
			      struct vmw_fence_obj *fence, u32 seqno,
324 325 326 327 328
			      void (*destroy) (struct vmw_fence_obj *fence))
{
	unsigned long irq_flags;
	int ret = 0;

329 330
	dma_fence_init(&fence->base, &vmw_fence_ops, &fman->lock,
		       fman->ctx, seqno);
331 332 333 334 335 336 337 338 339
	INIT_LIST_HEAD(&fence->seq_passed_actions);
	fence->destroy = destroy;

	spin_lock_irqsave(&fman->lock, irq_flags);
	if (unlikely(fman->fifo_down)) {
		ret = -EBUSY;
		goto out_unlock;
	}
	list_add_tail(&fence->head, &fman->fence_list);
340
	++fman->num_fence_objects;
341 342 343 344 345 346 347

out_unlock:
	spin_unlock_irqrestore(&fman->lock, irq_flags);
	return ret;

}

348
static void vmw_fences_perform_actions(struct vmw_fence_manager *fman,
349 350 351 352 353 354
				struct list_head *list)
{
	struct vmw_fence_action *action, *next_action;

	list_for_each_entry_safe(action, next_action, list, head) {
		list_del_init(&action->head);
T
Thomas Hellstrom 已提交
355
		fman->pending_actions[action->type]--;
356 357 358 359 360 361 362 363
		if (action->seq_passed != NULL)
			action->seq_passed(action);

		/*
		 * Add the cleanup action to the cleanup list so that
		 * it will be performed by a worker task.
		 */

T
Thomas Hellstrom 已提交
364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387
		list_add_tail(&action->head, &fman->cleanup_list);
	}
}

/**
 * vmw_fence_goal_new_locked - Figure out a new device fence goal
 * seqno if needed.
 *
 * @fman: Pointer to a fence manager.
 * @passed_seqno: The seqno the device currently signals as passed.
 *
 * This function should be called with the fence manager lock held.
 * It is typically called when we have a new passed_seqno, and
 * we might need to update the fence goal. It checks to see whether
 * the current fence goal has already passed, and, in that case,
 * scans through all unsignaled fences to get the next fence object with an
 * action attached, and sets the seqno of that fence as a new fence goal.
 *
 * returns true if the device goal seqno was updated. False otherwise.
 */
static bool vmw_fence_goal_new_locked(struct vmw_fence_manager *fman,
				      u32 passed_seqno)
{
	u32 goal_seqno;
388
	u32 *fifo_mem;
T
Thomas Hellstrom 已提交
389 390 391 392 393 394
	struct vmw_fence_obj *fence;

	if (likely(!fman->seqno_valid))
		return false;

	fifo_mem = fman->dev_priv->mmio_virt;
395
	goal_seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE_GOAL);
T
Thomas Hellstrom 已提交
396 397 398 399 400 401 402
	if (likely(passed_seqno - goal_seqno >= VMW_FENCE_WRAP))
		return false;

	fman->seqno_valid = false;
	list_for_each_entry(fence, &fman->fence_list, head) {
		if (!list_empty(&fence->seq_passed_actions)) {
			fman->seqno_valid = true;
403 404
			vmw_mmio_write(fence->base.seqno,
				       fifo_mem + SVGA_FIFO_FENCE_GOAL);
T
Thomas Hellstrom 已提交
405 406
			break;
		}
407
	}
T
Thomas Hellstrom 已提交
408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429

	return true;
}


/**
 * vmw_fence_goal_check_locked - Replace the device fence goal seqno if
 * needed.
 *
 * @fence: Pointer to a struct vmw_fence_obj the seqno of which should be
 * considered as a device fence goal.
 *
 * This function should be called with the fence manager lock held.
 * It is typically called when an action has been attached to a fence to
 * check whether the seqno of that fence should be used for a fence
 * goal interrupt. This is typically needed if the current fence goal is
 * invalid, or has a higher seqno than that of the current fence object.
 *
 * returns true if the device goal seqno was updated. False otherwise.
 */
static bool vmw_fence_goal_check_locked(struct vmw_fence_obj *fence)
{
430
	struct vmw_fence_manager *fman = fman_from_fence(fence);
T
Thomas Hellstrom 已提交
431
	u32 goal_seqno;
432
	u32 *fifo_mem;
T
Thomas Hellstrom 已提交
433

434
	if (dma_fence_is_signaled_locked(&fence->base))
T
Thomas Hellstrom 已提交
435 436
		return false;

437
	fifo_mem = fman->dev_priv->mmio_virt;
438
	goal_seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE_GOAL);
439 440
	if (likely(fman->seqno_valid &&
		   goal_seqno - fence->base.seqno < VMW_FENCE_WRAP))
T
Thomas Hellstrom 已提交
441 442
		return false;

443
	vmw_mmio_write(fence->base.seqno, fifo_mem + SVGA_FIFO_FENCE_GOAL);
444
	fman->seqno_valid = true;
T
Thomas Hellstrom 已提交
445 446

	return true;
447 448
}

449
static void __vmw_fences_update(struct vmw_fence_manager *fman)
450 451 452
{
	struct vmw_fence_obj *fence, *next_fence;
	struct list_head action_list;
T
Thomas Hellstrom 已提交
453 454
	bool needs_rerun;
	uint32_t seqno, new_seqno;
455
	u32 *fifo_mem = fman->dev_priv->mmio_virt;
456

457
	seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE);
T
Thomas Hellstrom 已提交
458
rerun:
459
	list_for_each_entry_safe(fence, next_fence, &fman->fence_list, head) {
460
		if (seqno - fence->base.seqno < VMW_FENCE_WRAP) {
461
			list_del_init(&fence->head);
462
			dma_fence_signal_locked(&fence->base);
463 464 465 466
			INIT_LIST_HEAD(&action_list);
			list_splice_init(&fence->seq_passed_actions,
					 &action_list);
			vmw_fences_perform_actions(fman, &action_list);
T
Thomas Hellstrom 已提交
467 468
		} else
			break;
469
	}
T
Thomas Hellstrom 已提交
470 471 472 473 474 475 476

	/*
	 * Rerun if the fence goal seqno was updated, and the
	 * hardware might have raced with that update, so that
	 * we missed a fence_goal irq.
	 */

477
	needs_rerun = vmw_fence_goal_new_locked(fman, seqno);
T
Thomas Hellstrom 已提交
478
	if (unlikely(needs_rerun)) {
479
		new_seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE);
T
Thomas Hellstrom 已提交
480 481 482 483 484
		if (new_seqno != seqno) {
			seqno = new_seqno;
			goto rerun;
		}
	}
485 486 487

	if (!list_empty(&fman->cleanup_list))
		(void) schedule_work(&fman->work);
T
Thomas Hellstrom 已提交
488
}
489

490
void vmw_fences_update(struct vmw_fence_manager *fman)
491 492 493 494
{
	unsigned long irq_flags;

	spin_lock_irqsave(&fman->lock, irq_flags);
495
	__vmw_fences_update(fman);
496
	spin_unlock_irqrestore(&fman->lock, irq_flags);
497 498 499 500 501
}

bool vmw_fence_obj_signaled(struct vmw_fence_obj *fence)
{
	struct vmw_fence_manager *fman = fman_from_fence(fence);
502

503
	if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->base.flags))
504 505
		return 1;

506
	vmw_fences_update(fman);
507

508
	return dma_fence_is_signaled(&fence->base);
509 510
}

511
int vmw_fence_obj_wait(struct vmw_fence_obj *fence, bool lazy,
512 513
		       bool interruptible, unsigned long timeout)
{
514
	long ret = dma_fence_wait_timeout(&fence->base, interruptible, timeout);
515

516
	if (likely(ret > 0))
517
		return 0;
518 519
	else if (ret == 0)
		return -EBUSY;
520
	else
521
		return ret;
522 523 524 525
}

void vmw_fence_obj_flush(struct vmw_fence_obj *fence)
{
526
	struct vmw_private *dev_priv = fman_from_fence(fence)->dev_priv;
527 528 529 530 531 532

	vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
}

static void vmw_fence_destroy(struct vmw_fence_obj *fence)
{
533
	dma_fence_free(&fence->base);
534 535 536 537 538 539 540
}

int vmw_fence_create(struct vmw_fence_manager *fman,
		     uint32_t seqno,
		     struct vmw_fence_obj **p_fence)
{
	struct vmw_fence_obj *fence;
541
 	int ret;
542 543

	fence = kzalloc(sizeof(*fence), GFP_KERNEL);
544 545
	if (unlikely(fence == NULL))
		return -ENOMEM;
546

547
	ret = vmw_fence_obj_init(fman, fence, seqno,
548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564
				 vmw_fence_destroy);
	if (unlikely(ret != 0))
		goto out_err_init;

	*p_fence = fence;
	return 0;

out_err_init:
	kfree(fence);
	return ret;
}


static void vmw_user_fence_destroy(struct vmw_fence_obj *fence)
{
	struct vmw_user_fence *ufence =
		container_of(fence, struct vmw_user_fence, fence);
565
	struct vmw_fence_manager *fman = fman_from_fence(fence);
566

567
	ttm_base_object_kfree(ufence, base);
568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614
	/*
	 * Free kernel space accounting.
	 */
	ttm_mem_global_free(vmw_mem_glob(fman->dev_priv),
			    fman->user_fence_size);
}

static void vmw_user_fence_base_release(struct ttm_base_object **p_base)
{
	struct ttm_base_object *base = *p_base;
	struct vmw_user_fence *ufence =
		container_of(base, struct vmw_user_fence, base);
	struct vmw_fence_obj *fence = &ufence->fence;

	*p_base = NULL;
	vmw_fence_obj_unreference(&fence);
}

int vmw_user_fence_create(struct drm_file *file_priv,
			  struct vmw_fence_manager *fman,
			  uint32_t seqno,
			  struct vmw_fence_obj **p_fence,
			  uint32_t *p_handle)
{
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
	struct vmw_user_fence *ufence;
	struct vmw_fence_obj *tmp;
	struct ttm_mem_global *mem_glob = vmw_mem_glob(fman->dev_priv);
	int ret;

	/*
	 * Kernel memory space accounting, since this object may
	 * be created by a user-space request.
	 */

	ret = ttm_mem_global_alloc(mem_glob, fman->user_fence_size,
				   false, false);
	if (unlikely(ret != 0))
		return ret;

	ufence = kzalloc(sizeof(*ufence), GFP_KERNEL);
	if (unlikely(ufence == NULL)) {
		ret = -ENOMEM;
		goto out_no_object;
	}

	ret = vmw_fence_obj_init(fman, &ufence->fence, seqno,
615
				 vmw_user_fence_destroy);
616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665
	if (unlikely(ret != 0)) {
		kfree(ufence);
		goto out_no_object;
	}

	/*
	 * The base object holds a reference which is freed in
	 * vmw_user_fence_base_release.
	 */
	tmp = vmw_fence_obj_reference(&ufence->fence);
	ret = ttm_base_object_init(tfile, &ufence->base, false,
				   VMW_RES_FENCE,
				   &vmw_user_fence_base_release, NULL);


	if (unlikely(ret != 0)) {
		/*
		 * Free the base object's reference
		 */
		vmw_fence_obj_unreference(&tmp);
		goto out_err;
	}

	*p_fence = &ufence->fence;
	*p_handle = ufence->base.hash.key;

	return 0;
out_err:
	tmp = &ufence->fence;
	vmw_fence_obj_unreference(&tmp);
out_no_object:
	ttm_mem_global_free(mem_glob, fman->user_fence_size);
	return ret;
}


/**
 * vmw_fence_fifo_down - signal all unsignaled fence objects.
 */

void vmw_fence_fifo_down(struct vmw_fence_manager *fman)
{
	struct list_head action_list;
	int ret;

	/*
	 * The list may be altered while we traverse it, so always
	 * restart when we've released the fman->lock.
	 */

666
	spin_lock_irq(&fman->lock);
667 668 669 670 671
	fman->fifo_down = true;
	while (!list_empty(&fman->fence_list)) {
		struct vmw_fence_obj *fence =
			list_entry(fman->fence_list.prev, struct vmw_fence_obj,
				   head);
672
		dma_fence_get(&fence->base);
673 674
		spin_unlock_irq(&fman->lock);

675
		ret = vmw_fence_obj_wait(fence, false, false,
676 677 678 679
					 VMW_FENCE_WAIT_TIMEOUT);

		if (unlikely(ret != 0)) {
			list_del_init(&fence->head);
680
			dma_fence_signal(&fence->base);
681 682 683 684 685 686 687
			INIT_LIST_HEAD(&action_list);
			list_splice_init(&fence->seq_passed_actions,
					 &action_list);
			vmw_fences_perform_actions(fman, &action_list);
		}

		BUG_ON(!list_empty(&fence->head));
688
		dma_fence_put(&fence->base);
689
		spin_lock_irq(&fman->lock);
690
	}
691
	spin_unlock_irq(&fman->lock);
692 693 694 695 696 697 698 699 700 701 702 703
}

void vmw_fence_fifo_up(struct vmw_fence_manager *fman)
{
	unsigned long irq_flags;

	spin_lock_irqsave(&fman->lock, irq_flags);
	fman->fifo_down = false;
	spin_unlock_irqrestore(&fman->lock, irq_flags);
}


704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738
/**
 * vmw_fence_obj_lookup - Look up a user-space fence object
 *
 * @tfile: A struct ttm_object_file identifying the caller.
 * @handle: A handle identifying the fence object.
 * @return: A struct vmw_user_fence base ttm object on success or
 * an error pointer on failure.
 *
 * The fence object is looked up and type-checked. The caller needs
 * to have opened the fence object first, but since that happens on
 * creation and fence objects aren't shareable, that's not an
 * issue currently.
 */
static struct ttm_base_object *
vmw_fence_obj_lookup(struct ttm_object_file *tfile, u32 handle)
{
	struct ttm_base_object *base = ttm_base_object_lookup(tfile, handle);

	if (!base) {
		pr_err("Invalid fence object handle 0x%08lx.\n",
		       (unsigned long)handle);
		return ERR_PTR(-EINVAL);
	}

	if (base->refcount_release != vmw_user_fence_base_release) {
		pr_err("Invalid fence object handle 0x%08lx.\n",
		       (unsigned long)handle);
		ttm_base_object_unref(&base);
		return ERR_PTR(-EINVAL);
	}

	return base;
}


739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763
int vmw_fence_obj_wait_ioctl(struct drm_device *dev, void *data,
			     struct drm_file *file_priv)
{
	struct drm_vmw_fence_wait_arg *arg =
	    (struct drm_vmw_fence_wait_arg *)data;
	unsigned long timeout;
	struct ttm_base_object *base;
	struct vmw_fence_obj *fence;
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
	int ret;
	uint64_t wait_timeout = ((uint64_t)arg->timeout_us * HZ);

	/*
	 * 64-bit division not present on 32-bit systems, so do an
	 * approximation. (Divide by 1000000).
	 */

	wait_timeout = (wait_timeout >> 20) + (wait_timeout >> 24) -
	  (wait_timeout >> 26);

	if (!arg->cookie_valid) {
		arg->cookie_valid = 1;
		arg->kernel_cookie = jiffies + wait_timeout;
	}

764 765 766
	base = vmw_fence_obj_lookup(tfile, arg->handle);
	if (IS_ERR(base))
		return PTR_ERR(base);
767 768 769 770 771

	fence = &(container_of(base, struct vmw_user_fence, base)->fence);

	timeout = jiffies;
	if (time_after_eq(timeout, (unsigned long)arg->kernel_cookie)) {
772
		ret = ((vmw_fence_obj_signaled(fence)) ?
773 774 775 776 777 778
		       0 : -EBUSY);
		goto out;
	}

	timeout = (unsigned long)arg->kernel_cookie - timeout;

779
	ret = vmw_fence_obj_wait(fence, arg->lazy, true, timeout);
780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804

out:
	ttm_base_object_unref(&base);

	/*
	 * Optionally unref the fence object.
	 */

	if (ret == 0 && (arg->wait_options & DRM_VMW_WAIT_OPTION_UNREF))
		return ttm_ref_object_base_unref(tfile, arg->handle,
						 TTM_REF_USAGE);
	return ret;
}

int vmw_fence_obj_signaled_ioctl(struct drm_device *dev, void *data,
				 struct drm_file *file_priv)
{
	struct drm_vmw_fence_signaled_arg *arg =
		(struct drm_vmw_fence_signaled_arg *) data;
	struct ttm_base_object *base;
	struct vmw_fence_obj *fence;
	struct vmw_fence_manager *fman;
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
	struct vmw_private *dev_priv = vmw_priv(dev);

805 806 807
	base = vmw_fence_obj_lookup(tfile, arg->handle);
	if (IS_ERR(base))
		return PTR_ERR(base);
808 809

	fence = &(container_of(base, struct vmw_user_fence, base)->fence);
810
	fman = fman_from_fence(fence);
811

812
	arg->signaled = vmw_fence_obj_signaled(fence);
813

814
	arg->signaled_flags = arg->flags;
815
	spin_lock_irq(&fman->lock);
816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834
	arg->passed_seqno = dev_priv->last_read_seqno;
	spin_unlock_irq(&fman->lock);

	ttm_base_object_unref(&base);

	return 0;
}


int vmw_fence_obj_unref_ioctl(struct drm_device *dev, void *data,
			      struct drm_file *file_priv)
{
	struct drm_vmw_fence_arg *arg =
		(struct drm_vmw_fence_arg *) data;

	return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
					 arg->handle,
					 TTM_REF_USAGE);
}
T
Thomas Hellstrom 已提交
835 836 837 838 839 840 841 842 843 844

/**
 * vmw_event_fence_action_seq_passed
 *
 * @action: The struct vmw_fence_action embedded in a struct
 * vmw_event_fence_action.
 *
 * This function is called when the seqno of the fence where @action is
 * attached has passed. It queues the event on the submitter's event list.
 * This function is always called from atomic context, and may be called
845
 * from irq context.
T
Thomas Hellstrom 已提交
846 847 848 849 850 851
 */
static void vmw_event_fence_action_seq_passed(struct vmw_fence_action *action)
{
	struct vmw_event_fence_action *eaction =
		container_of(action, struct vmw_event_fence_action, action);
	struct drm_device *dev = eaction->dev;
852 853
	struct drm_pending_event *event = eaction->event;
	struct drm_file *file_priv;
T
Thomas Hellstrom 已提交
854 855
	unsigned long irq_flags;

856 857 858 859
	if (unlikely(event == NULL))
		return;

	file_priv = event->file_priv;
T
Thomas Hellstrom 已提交
860 861 862 863 864 865 866 867 868 869
	spin_lock_irqsave(&dev->event_lock, irq_flags);

	if (likely(eaction->tv_sec != NULL)) {
		struct timeval tv;

		do_gettimeofday(&tv);
		*eaction->tv_sec = tv.tv_sec;
		*eaction->tv_usec = tv.tv_usec;
	}

870
	drm_send_event_locked(dev, eaction->event);
871
	eaction->event = NULL;
T
Thomas Hellstrom 已提交
872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889
	spin_unlock_irqrestore(&dev->event_lock, irq_flags);
}

/**
 * vmw_event_fence_action_cleanup
 *
 * @action: The struct vmw_fence_action embedded in a struct
 * vmw_event_fence_action.
 *
 * This function is the struct vmw_fence_action destructor. It's typically
 * called from a workqueue.
 */
static void vmw_event_fence_action_cleanup(struct vmw_fence_action *action)
{
	struct vmw_event_fence_action *eaction =
		container_of(action, struct vmw_event_fence_action, action);

	vmw_fence_obj_unreference(&eaction->fence);
890
	kfree(eaction);
T
Thomas Hellstrom 已提交
891 892 893 894 895 896 897 898 899 900 901 902
}


/**
 * vmw_fence_obj_add_action - Add an action to a fence object.
 *
 * @fence - The fence object.
 * @action - The action to add.
 *
 * Note that the action callbacks may be executed before this function
 * returns.
 */
903
static void vmw_fence_obj_add_action(struct vmw_fence_obj *fence,
T
Thomas Hellstrom 已提交
904 905
			      struct vmw_fence_action *action)
{
906
	struct vmw_fence_manager *fman = fman_from_fence(fence);
T
Thomas Hellstrom 已提交
907 908 909 910 911 912 913
	unsigned long irq_flags;
	bool run_update = false;

	mutex_lock(&fman->goal_irq_mutex);
	spin_lock_irqsave(&fman->lock, irq_flags);

	fman->pending_actions[action->type]++;
914
	if (dma_fence_is_signaled_locked(&fence->base)) {
T
Thomas Hellstrom 已提交
915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957
		struct list_head action_list;

		INIT_LIST_HEAD(&action_list);
		list_add_tail(&action->head, &action_list);
		vmw_fences_perform_actions(fman, &action_list);
	} else {
		list_add_tail(&action->head, &fence->seq_passed_actions);

		/*
		 * This function may set fman::seqno_valid, so it must
		 * be run with the goal_irq_mutex held.
		 */
		run_update = vmw_fence_goal_check_locked(fence);
	}

	spin_unlock_irqrestore(&fman->lock, irq_flags);

	if (run_update) {
		if (!fman->goal_irq_on) {
			fman->goal_irq_on = true;
			vmw_goal_waiter_add(fman->dev_priv);
		}
		vmw_fences_update(fman);
	}
	mutex_unlock(&fman->goal_irq_mutex);

}

/**
 * vmw_event_fence_action_create - Post an event for sending when a fence
 * object seqno has passed.
 *
 * @file_priv: The file connection on which the event should be posted.
 * @fence: The fence object on which to post the event.
 * @event: Event to be posted. This event should've been alloced
 * using k[mz]alloc, and should've been completely initialized.
 * @interruptible: Interruptible waits if possible.
 *
 * As a side effect, the object pointed to by @event may have been
 * freed when this function returns. If this function returns with
 * an error code, the caller needs to free that object.
 */

958 959 960 961 962 963
int vmw_event_fence_action_queue(struct drm_file *file_priv,
				 struct vmw_fence_obj *fence,
				 struct drm_pending_event *event,
				 uint32_t *tv_sec,
				 uint32_t *tv_usec,
				 bool interruptible)
T
Thomas Hellstrom 已提交
964
{
965
	struct vmw_event_fence_action *eaction;
966
	struct vmw_fence_manager *fman = fman_from_fence(fence);
T
Thomas Hellstrom 已提交
967 968

	eaction = kzalloc(sizeof(*eaction), GFP_KERNEL);
969
	if (unlikely(eaction == NULL))
T
Thomas Hellstrom 已提交
970 971
		return -ENOMEM;

972
	eaction->event = event;
T
Thomas Hellstrom 已提交
973 974 975 976 977 978 979 980 981 982 983 984 985 986 987

	eaction->action.seq_passed = vmw_event_fence_action_seq_passed;
	eaction->action.cleanup = vmw_event_fence_action_cleanup;
	eaction->action.type = VMW_ACTION_EVENT;

	eaction->fence = vmw_fence_obj_reference(fence);
	eaction->dev = fman->dev_priv->dev;
	eaction->tv_sec = tv_sec;
	eaction->tv_usec = tv_usec;

	vmw_fence_obj_add_action(fence, &eaction->action);

	return 0;
}

988 989 990 991 992
struct vmw_event_fence_pending {
	struct drm_pending_event base;
	struct drm_vmw_event_fence event;
};

993
static int vmw_event_fence_action_create(struct drm_file *file_priv,
994 995 996 997 998 999
				  struct vmw_fence_obj *fence,
				  uint32_t flags,
				  uint64_t user_data,
				  bool interruptible)
{
	struct vmw_event_fence_pending *event;
1000 1001
	struct vmw_fence_manager *fman = fman_from_fence(fence);
	struct drm_device *dev = fman->dev_priv->dev;
1002 1003
	int ret;

1004
	event = kzalloc(sizeof(*event), GFP_KERNEL);
1005 1006 1007
	if (unlikely(event == NULL)) {
		DRM_ERROR("Failed to allocate an event.\n");
		ret = -ENOMEM;
1008
		goto out_no_space;
1009 1010 1011 1012 1013 1014
	}

	event->event.base.type = DRM_VMW_EVENT_FENCE_SIGNALED;
	event->event.base.length = sizeof(*event);
	event->event.user_data = user_data;

1015
	ret = drm_event_reserve_init(dev, file_priv, &event->base, &event->event.base);
1016

1017 1018 1019 1020 1021
	if (unlikely(ret != 0)) {
		DRM_ERROR("Failed to allocate event space for this file.\n");
		kfree(event);
		goto out_no_space;
	}
1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037

	if (flags & DRM_VMW_FE_FLAG_REQ_TIME)
		ret = vmw_event_fence_action_queue(file_priv, fence,
						   &event->base,
						   &event->event.tv_sec,
						   &event->event.tv_usec,
						   interruptible);
	else
		ret = vmw_event_fence_action_queue(file_priv, fence,
						   &event->base,
						   NULL,
						   NULL,
						   interruptible);
	if (ret != 0)
		goto out_no_queue;

1038 1039
	return 0;

1040
out_no_queue:
1041
	drm_event_cancel_free(dev, &event->base);
1042 1043 1044 1045
out_no_space:
	return ret;
}

T
Thomas Hellstrom 已提交
1046 1047 1048 1049 1050 1051 1052 1053
int vmw_fence_event_ioctl(struct drm_device *dev, void *data,
			  struct drm_file *file_priv)
{
	struct vmw_private *dev_priv = vmw_priv(dev);
	struct drm_vmw_fence_event_arg *arg =
		(struct drm_vmw_fence_event_arg *) data;
	struct vmw_fence_obj *fence = NULL;
	struct vmw_fpriv *vmw_fp = vmw_fpriv(file_priv);
1054
	struct ttm_object_file *tfile = vmw_fp->tfile;
T
Thomas Hellstrom 已提交
1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
	struct drm_vmw_fence_rep __user *user_fence_rep =
		(struct drm_vmw_fence_rep __user *)(unsigned long)
		arg->fence_rep;
	uint32_t handle;
	int ret;

	/*
	 * Look up an existing fence object,
	 * and if user-space wants a new reference,
	 * add one.
	 */
	if (arg->handle) {
		struct ttm_base_object *base =
1068 1069 1070 1071 1072
			vmw_fence_obj_lookup(tfile, arg->handle);

		if (IS_ERR(base))
			return PTR_ERR(base);

T
Thomas Hellstrom 已提交
1073 1074 1075 1076 1077
		fence = &(container_of(base, struct vmw_user_fence,
				       base)->fence);
		(void) vmw_fence_obj_reference(fence);

		if (user_fence_rep != NULL) {
1078 1079
			ret = ttm_ref_object_add(vmw_fp->tfile, base,
						 TTM_REF_USAGE, NULL, false);
T
Thomas Hellstrom 已提交
1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105
			if (unlikely(ret != 0)) {
				DRM_ERROR("Failed to reference a fence "
					  "object.\n");
				goto out_no_ref_obj;
			}
			handle = base->hash.key;
		}
		ttm_base_object_unref(&base);
	}

	/*
	 * Create a new fence object.
	 */
	if (!fence) {
		ret = vmw_execbuf_fence_commands(file_priv, dev_priv,
						 &fence,
						 (user_fence_rep) ?
						 &handle : NULL);
		if (unlikely(ret != 0)) {
			DRM_ERROR("Fence event failed to create fence.\n");
			return ret;
		}
	}

	BUG_ON(fence == NULL);

1106 1107 1108 1109
	ret = vmw_event_fence_action_create(file_priv, fence,
					    arg->flags,
					    arg->user_data,
					    true);
T
Thomas Hellstrom 已提交
1110 1111 1112
	if (unlikely(ret != 0)) {
		if (ret != -ERESTARTSYS)
			DRM_ERROR("Failed to attach event to fence.\n");
1113
		goto out_no_create;
T
Thomas Hellstrom 已提交
1114 1115 1116 1117 1118 1119
	}

	vmw_execbuf_copy_fence_user(dev_priv, vmw_fp, 0, user_fence_rep, fence,
				    handle);
	vmw_fence_obj_unreference(&fence);
	return 0;
1120
out_no_create:
T
Thomas Hellstrom 已提交
1121
	if (user_fence_rep != NULL)
1122
		ttm_ref_object_base_unref(tfile, handle, TTM_REF_USAGE);
T
Thomas Hellstrom 已提交
1123 1124 1125 1126
out_no_ref_obj:
	vmw_fence_obj_unreference(&fence);
	return ret;
}