drivers/gpu/drm/msm/msm_ringbuffer.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2013 Red Hat
   4  * Author: Rob Clark <robdclark@gmail.com>
   5  */
   6
   7 #include "msm_ringbuffer.h"
   8 #include "msm_gpu.h"
   9
  10 struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id,
  11                 void *memptrs, uint64_t memptrs_iova)
  12 {
  13         struct msm_ringbuffer *ring;
  14         char name[32];
  15         int ret;
  16
  17         /* We assume everwhere that MSM_GPU_RINGBUFFER_SZ is a power of 2 */
  18         BUILD_BUG_ON(!is_power_of_2(MSM_GPU_RINGBUFFER_SZ));
  19
  20         ring = kzalloc(sizeof(*ring), GFP_KERNEL);
  21         if (!ring) {
  22                 ret = -ENOMEM;
  23                 goto fail;
  24         }
  25
  26         ring->gpu = gpu;
  27         ring->id = id;
  28
  29         ring->start = msm_gem_kernel_new(gpu->dev, MSM_GPU_RINGBUFFER_SZ,
  30                 MSM_BO_WC, gpu->aspace, &ring->bo, &ring->iova);
  31
  32         if (IS_ERR(ring->start)) {
  33                 ret = PTR_ERR(ring->start);
  34                 ring->start = 0;
  35                 goto fail;
  36         }
  37
  38         msm_gem_object_set_name(ring->bo, "ring%d", id);
  39
  40         ring->end   = ring->start + (MSM_GPU_RINGBUFFER_SZ >> 2);
  41         ring->next  = ring->start;
  42         ring->cur   = ring->start;
  43
  44         ring->memptrs = memptrs;
  45         ring->memptrs_iova = memptrs_iova;
  46
  47         INIT_LIST_HEAD(&ring->submits);
  48         spin_lock_init(&ring->lock);
  49
  50         snprintf(name, sizeof(name), "gpu-ring-%d", ring->id);
  51
  52         ring->fctx = msm_fence_context_alloc(gpu->dev, name);
  53
  54         return ring;
  55
  56 fail:
  57         msm_ringbuffer_destroy(ring);
  58         return ERR_PTR(ret);
  59 }
  60
  61 void msm_ringbuffer_destroy(struct msm_ringbuffer *ring)
  62 {
  63         if (IS_ERR_OR_NULL(ring))
  64                 return;
  65
  66         msm_fence_context_free(ring->fctx);
  67
  68         msm_gem_kernel_put(ring->bo, ring->gpu->aspace, false);
  69
  70         kfree(ring);
  71 }