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