/* * 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;	ring->bo = msm_gem_new(gpu->dev, size, MSM_BO_WC);	if (IS_ERR(ring->bo)) {		ret = PTR_ERR(ring->bo);		ring->bo = NULL;		goto fail;	} 	ring->start = msm_gem_get_vaddr(ring->bo);	if (IS_ERR(ring->start)) {		ret = PTR_ERR(ring->start);		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);}