linux/drivers/gpu/drm/nouveau/nouveau_dma.c

/*
 * Copyright (C) 2007 Ben Skeggs.
 * 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, sublicense, 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 NONINFRINGEMENT.
 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) 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.
 *
 */

#include "nouveau_drv.h"
#include "nouveau_dma.h"
#include "nouveau_vmm.h"

#include <nvif/user.h>

/* Fetch and adjust GPU GET pointer
 *
 * Returns:
 *  value >= 0, the adjusted GET pointer
 *  -EINVAL if GET pointer currently outside main push buffer
 *  -EBUSY if timeout exceeded
 */
static inline int
READ_GET(struct nouveau_channel *chan, uint64_t *prev_get, int *timeout)
{ … }

void
nv50_dma_push(struct nouveau_channel *chan, u64 offset, u32 length,
	      bool no_prefetch)
{ … }

static int
nv50_dma_push_wait(struct nouveau_channel *chan, int count)
{ … }

static int
nv50_dma_wait(struct nouveau_channel *chan, int slots, int count)
{ … }

int
nouveau_dma_wait(struct nouveau_channel *chan, int slots, int size)
{ … }