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      1 /*	$NetBSD: nouveau_nv10_fence.c,v 1.6 2021/12/18 23:45:32 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2012 Red Hat Inc.
      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: Ben Skeggs <bskeggs (at) redhat.com>
     25  */
     26 
     27 #include <sys/cdefs.h>
     28 __KERNEL_RCSID(0, "$NetBSD: nouveau_nv10_fence.c,v 1.6 2021/12/18 23:45:32 riastradh Exp $");
     29 
     30 #include "nouveau_drv.h"
     31 #include "nouveau_dma.h"
     32 #include "nv10_fence.h"
     33 
     34 int
     35 nv10_fence_emit(struct nouveau_fence *fence)
     36 {
     37 	struct nouveau_channel *chan = fence->channel;
     38 	int ret = RING_SPACE(chan, 2);
     39 	if (ret == 0) {
     40 		BEGIN_NV04(chan, 0, NV10_SUBCHAN_REF_CNT, 1);
     41 		OUT_RING  (chan, fence->base.seqno);
     42 		FIRE_RING (chan);
     43 	}
     44 	return ret;
     45 }
     46 
     47 
     48 static int
     49 nv10_fence_sync(struct nouveau_fence *fence,
     50 		struct nouveau_channel *prev, struct nouveau_channel *chan)
     51 {
     52 	return -ENODEV;
     53 }
     54 
     55 u32
     56 nv10_fence_read(struct nouveau_channel *chan)
     57 {
     58 	return nvif_rd32(&chan->user, 0x0048);
     59 }
     60 
     61 void
     62 nv10_fence_context_del(struct nouveau_channel *chan)
     63 {
     64 	struct nv10_fence_chan *fctx = chan->fence;
     65 	nouveau_fence_context_del(&fctx->base);
     66 	nvif_object_fini(&fctx->sema);
     67 	chan->fence = NULL;
     68 	nouveau_fence_context_free(&fctx->base);
     69 }
     70 
     71 static int
     72 nv10_fence_context_new(struct nouveau_channel *chan)
     73 {
     74 	struct nv10_fence_chan *fctx;
     75 
     76 	fctx = chan->fence = kzalloc(sizeof(*fctx), GFP_KERNEL);
     77 	if (!fctx)
     78 		return -ENOMEM;
     79 
     80 	nouveau_fence_context_new(chan, &fctx->base);
     81 	fctx->base.emit = nv10_fence_emit;
     82 	fctx->base.read = nv10_fence_read;
     83 	fctx->base.sync = nv10_fence_sync;
     84 	return 0;
     85 }
     86 
     87 void
     88 nv10_fence_destroy(struct nouveau_drm *drm)
     89 {
     90 	struct nv10_fence_priv *priv = drm->fence;
     91 	nouveau_bo_unmap(priv->bo);
     92 	if (priv->bo)
     93 		nouveau_bo_unpin(priv->bo);
     94 	nouveau_bo_ref(NULL, &priv->bo);
     95 	drm->fence = NULL;
     96 	spin_lock_destroy(&priv->lock);
     97 	kfree(priv);
     98 }
     99 
    100 int
    101 nv10_fence_create(struct nouveau_drm *drm)
    102 {
    103 	struct nv10_fence_priv *priv;
    104 
    105 	priv = drm->fence = kzalloc(sizeof(*priv), GFP_KERNEL);
    106 	if (!priv)
    107 		return -ENOMEM;
    108 
    109 	priv->base.dtor = nv10_fence_destroy;
    110 	priv->base.context_new = nv10_fence_context_new;
    111 	priv->base.context_del = nv10_fence_context_del;
    112 	spin_lock_init(&priv->lock);
    113 	return 0;
    114 }
    115