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 static uint num_hw_submissions = 8;
  11 MODULE_PARM_DESC(num_hw_submissions, "The max # of jobs to write into ringbuffer (default 8)");
  12 module_param(num_hw_submissions, uint, 0600);
  13
  14 static struct dma_fence *msm_job_run(struct drm_sched_job *job)
  15 {
  16         struct msm_gem_submit *submit = to_msm_submit(job);
  17         struct msm_fence_context *fctx = submit->ring->fctx;
  18         struct msm_gpu *gpu = submit->gpu;
  19         struct msm_drm_private *priv = gpu->dev->dev_private;
  20         int i;
  21
  22         msm_fence_init(submit->hw_fence, fctx);
  23
  24         submit->seqno = submit->hw_fence->seqno;
  25
  26         mutex_lock(&priv->lru.lock);
  27
  28         for (i = 0; i < submit->nr_bos; i++) {
  29                 struct drm_gem_object *obj = submit->bos[i].obj;
  30
  31                 msm_gem_unpin_active(obj);
  32                 submit->bos[i].flags &= ~BO_PINNED;
  33         }
  34
  35         mutex_unlock(&priv->lru.lock);
  36
  37         msm_gpu_submit(gpu, submit);
  38
  39         return dma_fence_get(submit->hw_fence);
  40 }
  41
  42 static void msm_job_free(struct drm_sched_job *job)
  43 {
  44         struct msm_gem_submit *submit = to_msm_submit(job);
  45
  46         drm_sched_job_cleanup(job);
  47         msm_gem_submit_put(submit);
  48 }
  49
  50 static const struct drm_sched_backend_ops msm_sched_ops = {
  51         .run_job = msm_job_run,
  52         .free_job = msm_job_free
  53 };
  54
  55 struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id,
  56                 void *memptrs, uint64_t memptrs_iova)
  57 {
  58         struct msm_ringbuffer *ring;
  59         long sched_timeout;
  60         char name[32];
  61         int ret;
  62
  63         /* We assume everwhere that MSM_GPU_RINGBUFFER_SZ is a power of 2 */
  64         BUILD_BUG_ON(!is_power_of_2(MSM_GPU_RINGBUFFER_SZ));
  65
  66         ring = kzalloc(sizeof(*ring), GFP_KERNEL);
  67         if (!ring) {
  68                 ret = -ENOMEM;
  69                 goto fail;
  70         }
  71
  72         ring->gpu = gpu;
  73         ring->id = id;
  74
  75         ring->start = msm_gem_kernel_new(gpu->dev, MSM_GPU_RINGBUFFER_SZ,
  76                 check_apriv(gpu, MSM_BO_WC | MSM_BO_GPU_READONLY),
  77                 gpu->aspace, &ring->bo, &ring->iova);
  78
  79         if (IS_ERR(ring->start)) {
  80                 ret = PTR_ERR(ring->start);
  81                 ring->start = NULL;
  82                 goto fail;
  83         }
  84
  85         msm_gem_object_set_name(ring->bo, "ring%d", id);
  86
  87         ring->end   = ring->start + (MSM_GPU_RINGBUFFER_SZ >> 2);
  88         ring->next  = ring->start;
  89         ring->cur   = ring->start;
  90
  91         ring->memptrs = memptrs;
  92         ring->memptrs_iova = memptrs_iova;
  93
  94          /* currently managing hangcheck ourselves: */
  95         sched_timeout = MAX_SCHEDULE_TIMEOUT;
  96
  97         ret = drm_sched_init(&ring->sched, &msm_sched_ops,
  98                              DRM_SCHED_PRIORITY_COUNT,
  99                              num_hw_submissions, 0, sched_timeout,
 100                              NULL, NULL, to_msm_bo(ring->bo)->name, gpu->dev->dev);
 101         if (ret) {
 102                 goto fail;
 103         }
 104
 105         INIT_LIST_HEAD(&ring->submits);
 106         spin_lock_init(&ring->submit_lock);
 107         spin_lock_init(&ring->preempt_lock);
 108
 109         snprintf(name, sizeof(name), "gpu-ring-%d", ring->id);
 110
 111         ring->fctx = msm_fence_context_alloc(gpu->dev, &ring->memptrs->fence, name);
 112
 113         return ring;
 114
 115 fail:
 116         msm_ringbuffer_destroy(ring);
 117         return ERR_PTR(ret);
 118 }
 119
 120 void msm_ringbuffer_destroy(struct msm_ringbuffer *ring)
 121 {
 122         if (IS_ERR_OR_NULL(ring))
 123                 return;
 124
 125         drm_sched_fini(&ring->sched);
 126
 127         msm_fence_context_free(ring->fctx);
 128
 129         msm_gem_kernel_put(ring->bo, ring->gpu->aspace);
 130
 131         kfree(ring);
 132 }