67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
/*
|
|
* Copyright (C) 2013 Red Hat
|
|
* Author: Rob Clark <robdclark@gmail.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published by
|
|
* the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with
|
|
* this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "msm_ringbuffer.h"
|
|
#include "msm_gpu.h"
|
|
|
|
struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int size)
|
|
{
|
|
struct msm_ringbuffer *ring;
|
|
int ret;
|
|
|
|
if (WARN_ON(!is_power_of_2(size)))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
ring = kzalloc(sizeof(*ring), GFP_KERNEL);
|
|
if (!ring) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
ring->gpu = gpu;
|
|
|
|
/* Pass NULL for the iova pointer - we will map it later */
|
|
ring->start = msm_gem_kernel_new(gpu->dev, size, MSM_BO_WC,
|
|
gpu->aspace, &ring->bo, NULL);
|
|
|
|
if (IS_ERR(ring->start)) {
|
|
ret = PTR_ERR(ring->start);
|
|
ring->start = 0;
|
|
goto fail;
|
|
}
|
|
ring->end = ring->start + (size / 4);
|
|
ring->cur = ring->start;
|
|
|
|
ring->size = size;
|
|
|
|
return ring;
|
|
|
|
fail:
|
|
if (ring)
|
|
msm_ringbuffer_destroy(ring);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
void msm_ringbuffer_destroy(struct msm_ringbuffer *ring)
|
|
{
|
|
if (ring->bo) {
|
|
msm_gem_put_vaddr(ring->bo);
|
|
drm_gem_object_unreference_unlocked(ring->bo);
|
|
}
|
|
kfree(ring);
|
|
}
|