[deliverable/linux.git] / drivers / gpu / drm / amd / amdgpu / amdgpu_sync.c

/*
 * Copyright 2014 Advanced Micro Devices, Inc.
 * 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 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.
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 */
/*
 * Authors:
 *    Christian König <christian.koenig@amd.com>
 */

#include <drm/drmP.h>
#include "amdgpu.h"
#include "amdgpu_trace.h"

/**
 * amdgpu_sync_create - zero init sync object
 *
 * @sync: sync object to initialize
 *
 * Just clear the sync object for now.
 */
void amdgpu_sync_create(struct amdgpu_sync *sync)
{
	unsigned i;

	for (i = 0; i < AMDGPU_NUM_SYNCS; ++i)
		sync->semaphores[i] = NULL;

	for (i = 0; i < AMDGPU_MAX_RINGS; ++i)
		sync->sync_to[i] = NULL;

	sync->last_vm_update = NULL;
}

/**
 * amdgpu_sync_fence - remember to sync to this fence
 *
 * @sync: sync object to add fence to
 * @fence: fence to sync to
 *
 */
int amdgpu_sync_fence(struct amdgpu_device *adev, struct amdgpu_sync *sync,
		      struct fence *f)
{
	struct amdgpu_fence *fence;
	struct amdgpu_fence *other;

	if (!f)
		return 0;

	fence = to_amdgpu_fence(f);
	if (!fence || fence->ring->adev != adev)
		return fence_wait(f, true);

	other = sync->sync_to[fence->ring->idx];
	sync->sync_to[fence->ring->idx] = amdgpu_fence_ref(
		amdgpu_fence_later(fence, other));
	amdgpu_fence_unref(&other);

	if (fence->owner == AMDGPU_FENCE_OWNER_VM) {
		other = sync->last_vm_update;
		sync->last_vm_update = amdgpu_fence_ref(
			amdgpu_fence_later(fence, other));
		amdgpu_fence_unref(&other);
	}

	return 0;
}

/**
 * amdgpu_sync_resv - use the semaphores to sync to a reservation object
 *
 * @sync: sync object to add fences from reservation object to
 * @resv: reservation object with embedded fence
 * @shared: true if we should only sync to the exclusive fence
 *
 * Sync to the fence using the semaphore objects
 */
int amdgpu_sync_resv(struct amdgpu_device *adev,
		     struct amdgpu_sync *sync,
		     struct reservation_object *resv,
		     void *owner)
{
	struct reservation_object_list *flist;
	struct fence *f;
	struct amdgpu_fence *fence;
	unsigned i;
	int r = 0;

	if (resv == NULL)
		return -EINVAL;

	/* always sync to the exclusive fence */
	f = reservation_object_get_excl(resv);
	r = amdgpu_sync_fence(adev, sync, f);

	flist = reservation_object_get_list(resv);
	if (!flist || r)
		return r;

	for (i = 0; i < flist->shared_count; ++i) {
		f = rcu_dereference_protected(flist->shared[i],
					      reservation_object_held(resv));
		fence = f ? to_amdgpu_fence(f) : NULL;
		if (fence && fence->ring->adev == adev &&
		    fence->owner == owner &&
		    fence->owner != AMDGPU_FENCE_OWNER_UNDEFINED)
				continue;

		r = amdgpu_sync_fence(adev, sync, f);
		if (r)
			break;
	}
	return r;
}

/**
 * amdgpu_sync_rings - sync ring to all registered fences
 *
 * @sync: sync object to use
 * @ring: ring that needs sync
 *
 * Ensure that all registered fences are signaled before letting
 * the ring continue. The caller must hold the ring lock.
 */
int amdgpu_sync_rings(struct amdgpu_sync *sync,
		      struct amdgpu_ring *ring)
{
	struct amdgpu_device *adev = ring->adev;
	unsigned count = 0;
	int i, r;

	for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
		struct amdgpu_fence *fence = sync->sync_to[i];
		struct amdgpu_semaphore *semaphore;
		struct amdgpu_ring *other = adev->rings[i];

		/* check if we really need to sync */
		if (!amdgpu_fence_need_sync(fence, ring))
			continue;

		/* prevent GPU deadlocks */
		if (!other->ready) {
			dev_err(adev->dev, "Syncing to a disabled ring!");
			return -EINVAL;
		}

		if (amdgpu_enable_scheduler || (count >= AMDGPU_NUM_SYNCS)) {
			/* not enough room, wait manually */
			r = amdgpu_fence_wait(fence, false);
			if (r)
				return r;
			continue;
		}
		r = amdgpu_semaphore_create(adev, &semaphore);
		if (r)
			return r;

		sync->semaphores[count++] = semaphore;

		/* allocate enough space for sync command */
		r = amdgpu_ring_alloc(other, 16);
		if (r)
			return r;

		/* emit the signal semaphore */
		if (!amdgpu_semaphore_emit_signal(other, semaphore)) {
			/* signaling wasn't successful wait manually */
			amdgpu_ring_undo(other);
			r = amdgpu_fence_wait(fence, false);
			if (r)
				return r;
			continue;
		}

		/* we assume caller has already allocated space on waiters ring */
		if (!amdgpu_semaphore_emit_wait(ring, semaphore)) {
			/* waiting wasn't successful wait manually */
			amdgpu_ring_undo(other);
			r = amdgpu_fence_wait(fence, false);
			if (r)
				return r;
			continue;
		}

		amdgpu_ring_commit(other);
		amdgpu_fence_note_sync(fence, ring);
	}

	return 0;
}

/**
 * amdgpu_sync_free - free the sync object
 *
 * @adev: amdgpu_device pointer
 * @sync: sync object to use
 * @fence: fence to use for the free
 *
 * Free the sync object by freeing all semaphores in it.
 */
void amdgpu_sync_free(struct amdgpu_device *adev,
		      struct amdgpu_sync *sync,
		      struct amdgpu_fence *fence)
{
	unsigned i;

	for (i = 0; i < AMDGPU_NUM_SYNCS; ++i)
		amdgpu_semaphore_free(adev, &sync->semaphores[i], fence);

	for (i = 0; i < AMDGPU_MAX_RINGS; ++i)
		amdgpu_fence_unref(&sync->sync_to[i]);

	amdgpu_fence_unref(&sync->last_vm_update);
}
Commit	Line	Data
d38ceaf9 AD	1	/*
	2	* Copyright 2014 Advanced Micro Devices, Inc.
	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	* Christian König <christian.koenig@amd.com>
	29	*/
	30
	31	#include <drm/drmP.h>
	32	#include "amdgpu.h"
	33	#include "amdgpu_trace.h"
	34
	35	/**
	36	* amdgpu_sync_create - zero init sync object
	37	*
	38	* @sync: sync object to initialize
	39	*
	40	* Just clear the sync object for now.
	41	*/
	42	void amdgpu_sync_create(struct amdgpu_sync *sync)
	43	{
	44	unsigned i;
	45
	46	for (i = 0; i < AMDGPU_NUM_SYNCS; ++i)
	47	sync->semaphores[i] = NULL;
	48
	49	for (i = 0; i < AMDGPU_MAX_RINGS; ++i)
	50	sync->sync_to[i] = NULL;
	51
	52	sync->last_vm_update = NULL;
	53	}
	54
	55	/**
91e1a520	56	* amdgpu_sync_fence - remember to sync to this fence
d38ceaf9 AD	57	*
	58	* @sync: sync object to add fence to
	59	* @fence: fence to sync to
	60	*
d38ceaf9	61	*/
91e1a520 CK	62	int amdgpu_sync_fence(struct amdgpu_device adev, struct amdgpu_sync sync,
91e1a520 CK	63	struct fence *f)
d38ceaf9	64	{
91e1a520	65	struct amdgpu_fence *fence;
d38ceaf9 AD	66	struct amdgpu_fence *other;
d38ceaf9 AD	67
91e1a520 CK	68	if (!f)
	69	return 0;
	70
	71	fence = to_amdgpu_fence(f);
	72	if (!fence \|\| fence->ring->adev != adev)
	73	return fence_wait(f, true);
d38ceaf9 AD	74
	75	other = sync->sync_to[fence->ring->idx];
	76	sync->sync_to[fence->ring->idx] = amdgpu_fence_ref(
	77	amdgpu_fence_later(fence, other));
	78	amdgpu_fence_unref(&other);
	79
	80	if (fence->owner == AMDGPU_FENCE_OWNER_VM) {
	81	other = sync->last_vm_update;
	82	sync->last_vm_update = amdgpu_fence_ref(
	83	amdgpu_fence_later(fence, other));
	84	amdgpu_fence_unref(&other);
	85	}
91e1a520 CK	86
91e1a520 CK	87	return 0;
d38ceaf9 AD	88	}
	89
	90	/**
	91	* amdgpu_sync_resv - use the semaphores to sync to a reservation object
	92	*
	93	* @sync: sync object to add fences from reservation object to
	94	* @resv: reservation object with embedded fence
	95	* @shared: true if we should only sync to the exclusive fence
	96	*
	97	* Sync to the fence using the semaphore objects
	98	*/
	99	int amdgpu_sync_resv(struct amdgpu_device *adev,
	100	struct amdgpu_sync *sync,
	101	struct reservation_object *resv,
	102	void *owner)
	103	{
	104	struct reservation_object_list *flist;
	105	struct fence *f;
	106	struct amdgpu_fence *fence;
	107	unsigned i;
	108	int r = 0;
	109
4b095304 JZ	110	if (resv == NULL)
	111	return -EINVAL;
	112
d38ceaf9 AD	113	/* always sync to the exclusive fence */
d38ceaf9 AD	114	f = reservation_object_get_excl(resv);
91e1a520	115	r = amdgpu_sync_fence(adev, sync, f);
d38ceaf9 AD	116
	117	flist = reservation_object_get_list(resv);
	118	if (!flist \|\| r)
	119	return r;
	120
	121	for (i = 0; i < flist->shared_count; ++i) {
	122	f = rcu_dereference_protected(flist->shared[i],
	123	reservation_object_held(resv));
4b095304	124	fence = f ? to_amdgpu_fence(f) : NULL;
91e1a520 CK	125	if (fence && fence->ring->adev == adev &&
	126	fence->owner == owner &&
	127	fence->owner != AMDGPU_FENCE_OWNER_UNDEFINED)
	128	continue;
	129
	130	r = amdgpu_sync_fence(adev, sync, f);
	131	if (r)
	132	break;
d38ceaf9 AD	133	}
	134	return r;
	135	}
	136
	137	/**
	138	* amdgpu_sync_rings - sync ring to all registered fences
	139	*
	140	* @sync: sync object to use
	141	* @ring: ring that needs sync
	142	*
	143	* Ensure that all registered fences are signaled before letting
	144	* the ring continue. The caller must hold the ring lock.
	145	*/
	146	int amdgpu_sync_rings(struct amdgpu_sync *sync,
	147	struct amdgpu_ring *ring)
	148	{
	149	struct amdgpu_device *adev = ring->adev;
	150	unsigned count = 0;
	151	int i, r;
	152
	153	for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
	154	struct amdgpu_fence *fence = sync->sync_to[i];
	155	struct amdgpu_semaphore *semaphore;
	156	struct amdgpu_ring *other = adev->rings[i];
	157
	158	/* check if we really need to sync */
	159	if (!amdgpu_fence_need_sync(fence, ring))
	160	continue;
	161
	162	/* prevent GPU deadlocks */
	163	if (!other->ready) {
	164	dev_err(adev->dev, "Syncing to a disabled ring!");
	165	return -EINVAL;
	166	}
	167
2c4888a0	168	if (amdgpu_enable_scheduler \|\| (count >= AMDGPU_NUM_SYNCS)) {
d38ceaf9 AD	169	/* not enough room, wait manually */
	170	r = amdgpu_fence_wait(fence, false);
	171	if (r)
	172	return r;
	173	continue;
	174	}
	175	r = amdgpu_semaphore_create(adev, &semaphore);
	176	if (r)
	177	return r;
	178
	179	sync->semaphores[count++] = semaphore;
	180
	181	/* allocate enough space for sync command */
	182	r = amdgpu_ring_alloc(other, 16);
	183	if (r)
	184	return r;
	185
	186	/* emit the signal semaphore */
	187	if (!amdgpu_semaphore_emit_signal(other, semaphore)) {
	188	/* signaling wasn't successful wait manually */
	189	amdgpu_ring_undo(other);
	190	r = amdgpu_fence_wait(fence, false);
	191	if (r)
	192	return r;
	193	continue;
	194	}
	195
	196	/* we assume caller has already allocated space on waiters ring */
	197	if (!amdgpu_semaphore_emit_wait(ring, semaphore)) {
	198	/* waiting wasn't successful wait manually */
	199	amdgpu_ring_undo(other);
	200	r = amdgpu_fence_wait(fence, false);
	201	if (r)
	202	return r;
	203	continue;
	204	}
	205
	206	amdgpu_ring_commit(other);
	207	amdgpu_fence_note_sync(fence, ring);
	208	}
	209
	210	return 0;
	211	}
	212
	213	/**
	214	* amdgpu_sync_free - free the sync object
	215	*
	216	* @adev: amdgpu_device pointer
	217	* @sync: sync object to use
	218	* @fence: fence to use for the free
	219	*
	220	* Free the sync object by freeing all semaphores in it.
	221	*/
	222	void amdgpu_sync_free(struct amdgpu_device *adev,
	223	struct amdgpu_sync *sync,
	224	struct amdgpu_fence *fence)
	225	{
	226	unsigned i;
	227
	228	for (i = 0; i < AMDGPU_NUM_SYNCS; ++i)
	229	amdgpu_semaphore_free(adev, &sync->semaphores[i], fence);
	230
	231	for (i = 0; i < AMDGPU_MAX_RINGS; ++i)
	232	amdgpu_fence_unref(&sync->sync_to[i]);
233
234	amdgpu_fence_unref(&sync->last_vm_update);
235	}