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 if (WARN_ON(!is_power_of_2(size))) 27 return ERR_PTR(-EINVAL); 28 29 ring = kzalloc(sizeof(*ring), GFP_KERNEL); 30 if (!ring) { 31 ret = -ENOMEM; 32 goto fail; 33 } 34 35 ring->gpu = gpu; 36 ring->bo = msm_gem_new(gpu->dev, size, MSM_BO_WC); 37 if (IS_ERR(ring->bo)) { 38 ret = PTR_ERR(ring->bo); 39 ring->bo = NULL; 40 goto fail; 41 } 42 43 ring->start = msm_gem_get_vaddr_locked(ring->bo); 44 if (IS_ERR(ring->start)) { 45 ret = PTR_ERR(ring->start); 46 goto fail; 47 } 48 ring->end = ring->start + (size / 4); 49 ring->cur = ring->start; 50 51 ring->size = size; 52 53 return ring; 54 55 fail: 56 if (ring) 57 msm_ringbuffer_destroy(ring); 58 return ERR_PTR(ret); 59 } 60 61 void msm_ringbuffer_destroy(struct msm_ringbuffer *ring) 62 { 63 if (ring->bo) { 64 msm_gem_put_vaddr(ring->bo); 65 drm_gem_object_unreference_unlocked(ring->bo); 66 } 67 kfree(ring); 68 } 69