1 /* 2 * Copyright (C) 2013 Red Hat 3 * Author: Rob Clark <robdclark@gmail.com> 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 as published by 7 * the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * You should have received a copy of the GNU General Public License along with 15 * this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #include "msm_ringbuffer.h" 19 #include "msm_gpu.h" 20 21 struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int size) 22 { 23 struct msm_ringbuffer *ring; 24 int ret; 25 26 size = ALIGN(size, 4); /* size should be dword aligned */ 27 28 ring = kzalloc(sizeof(*ring), GFP_KERNEL); 29 if (!ring) { 30 ret = -ENOMEM; 31 goto fail; 32 } 33 34 ring->gpu = gpu; 35 ring->bo = msm_gem_new(gpu->dev, size, MSM_BO_WC); 36 if (IS_ERR(ring->bo)) { 37 ret = PTR_ERR(ring->bo); 38 ring->bo = NULL; 39 goto fail; 40 } 41 42 ring->start = msm_gem_vaddr_locked(ring->bo); 43 ring->end = ring->start + (size / 4); 44 ring->cur = ring->start; 45 46 ring->size = size; 47 48 return ring; 49 50 fail: 51 if (ring) 52 msm_ringbuffer_destroy(ring); 53 return ERR_PTR(ret); 54 } 55 56 void msm_ringbuffer_destroy(struct msm_ringbuffer *ring) 57 { 58 if (ring->bo) 59 drm_gem_object_unreference_unlocked(ring->bo); 60 kfree(ring); 61 } 62