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 <[email protected]>
   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_dependency(struct drm_sched_job *job,
  15                 struct drm_sched_entity *s_entity)
  16 {
  17         struct msm_gem_submit *submit = to_msm_submit(job);
  18
  19         if (!xa_empty(&submit->deps))
  20                 return xa_erase(&submit->deps, submit->last_dep++);
  21
  22         return NULL;
  23 }
  24
  25 static struct dma_fence *msm_job_run(struct drm_sched_job *job)
  26 {
  27         struct msm_gem_submit *submit = to_msm_submit(job);
  28         struct msm_gpu *gpu = submit->gpu;
  29
  30         submit->hw_fence = msm_fence_alloc(submit->ring->fctx);
  31
  32         pm_runtime_get_sync(&gpu->pdev->dev);
  33
  34         /* TODO move submit path over to using a per-ring lock.. */
  35         mutex_lock(&gpu->dev->struct_mutex);
  36
  37         msm_gpu_submit(gpu, submit);
  38
  39         mutex_unlock(&gpu->dev->struct_mutex);
  40
  41         pm_runtime_put(&gpu->pdev->dev);
  42
  43         return dma_fence_get(submit->hw_fence);
  44 }
  45
  46 static void msm_job_free(struct drm_sched_job *job)
  47 {
  48         struct msm_gem_submit *submit = to_msm_submit(job);
  49
  50         drm_sched_job_cleanup(job);
  51         msm_gem_submit_put(submit);
  52 }
  53
  54 const struct drm_sched_backend_ops msm_sched_ops = {
  55         .dependency = msm_job_dependency,
  56         .run_job = msm_job_run,
  57         .free_job = msm_job_free
  58 };
  59
  60 struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id,
  61                 void *memptrs, uint64_t memptrs_iova)
  62 {
  63         struct msm_ringbuffer *ring;
  64         long sched_timeout;
  65         char name[32];
  66         int ret;
  67
  68         /* We assume everwhere that MSM_GPU_RINGBUFFER_SZ is a power of 2 */
  69         BUILD_BUG_ON(!is_power_of_2(MSM_GPU_RINGBUFFER_SZ));
  70
  71         ring = kzalloc(sizeof(*ring), GFP_KERNEL);
  72         if (!ring) {
  73                 ret = -ENOMEM;
  74                 goto fail;
  75         }
  76
  77         ring->gpu = gpu;
  78         ring->id = id;
  79
  80         ring->start = msm_gem_kernel_new(gpu->dev, MSM_GPU_RINGBUFFER_SZ,
  81                 check_apriv(gpu, MSM_BO_WC | MSM_BO_GPU_READONLY),
  82                 gpu->aspace, &ring->bo, &ring->iova);
  83
  84         if (IS_ERR(ring->start)) {
  85                 ret = PTR_ERR(ring->start);
  86                 ring->start = NULL;
  87                 goto fail;
  88         }
  89
  90         msm_gem_object_set_name(ring->bo, "ring%d", id);
  91
  92         ring->end   = ring->start + (MSM_GPU_RINGBUFFER_SZ >> 2);
  93         ring->next  = ring->start;
  94         ring->cur   = ring->start;
  95
  96         ring->memptrs = memptrs;
  97         ring->memptrs_iova = memptrs_iova;
  98
  99          /* currently managing hangcheck ourselves: */
 100         sched_timeout = MAX_SCHEDULE_TIMEOUT;
 101
 102         ret = drm_sched_init(&ring->sched, &msm_sched_ops,
 103                         num_hw_submissions, 0, sched_timeout,
 104                         NULL, NULL, to_msm_bo(ring->bo)->name);
 105         if (ret) {
 106                 goto fail;
 107         }
 108
 109         INIT_LIST_HEAD(&ring->submits);
 110         spin_lock_init(&ring->submit_lock);
 111         spin_lock_init(&ring->preempt_lock);
 112
 113         snprintf(name, sizeof(name), "gpu-ring-%d", ring->id);
 114
 115         ring->fctx = msm_fence_context_alloc(gpu->dev, &ring->memptrs->fence, name);
 116
 117         return ring;
 118
 119 fail:
 120         msm_ringbuffer_destroy(ring);
 121         return ERR_PTR(ret);
 122 }
 123
 124 void msm_ringbuffer_destroy(struct msm_ringbuffer *ring)
 125 {
 126         if (IS_ERR_OR_NULL(ring))
 127                 return;
 128
 129         drm_sched_fini(&ring->sched);
 130
 131         msm_fence_context_free(ring->fctx);
 132
 133         msm_gem_kernel_put(ring->bo, ring->gpu->aspace);
 134
 135         kfree(ring);
 136 }