LXR linux/drivers/gpu/drm/msm/msm

   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
  10static uint num_hw_submissions = 8;
  11MODULE_PARM_DESC(num_hw_submissions, "The max # of jobs to write into ringbuffer (default 8)");
  12module_param(num_hw_submissions, uint, 0600);
  13
  14static 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        submit->hw_fence = msm_fence_alloc(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_lock(obj);
  27                msm_gem_unpin_vma_fenced(submit->bos[i].vma, fctx);
  28                submit->bos[i].flags &= ~BO_VMA_PINNED;
  29                msm_gem_unlock(obj);
  30        }
  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->lock);
  36
  37        msm_gpu_submit(gpu, submit);
  38
  39        mutex_unlock(&gpu->lock);
  40
  41        pm_runtime_put(&gpu->pdev->dev);
  42
  43        return dma_fence_get(submit->hw_fence);
  44}
  45
  46static 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
  54static const struct drm_sched_backend_ops msm_sched_ops = {
  55        .run_job = msm_job_run,
  56        .free_job = msm_job_free
  57};
  58
  59struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id,
  60                void *memptrs, uint64_t memptrs_iova)
  61{
  62        struct msm_ringbuffer *ring;
  63        long sched_timeout;
  64        char name[32];
  65        int ret;
  66
  67        /* We assume everwhere that MSM_GPU_RINGBUFFER_SZ is a power of 2 */
  68        BUILD_BUG_ON(!is_power_of_2(MSM_GPU_RINGBUFFER_SZ));
  69
  70        ring = kzalloc(sizeof(*ring), GFP_KERNEL);
  71        if (!ring) {
  72                ret = -ENOMEM;
  73                goto fail;
  74        }
  75
  76        ring->gpu = gpu;
  77        ring->id = id;
  78
  79        ring->start = msm_gem_kernel_new(gpu->dev, MSM_GPU_RINGBUFFER_SZ,
  80                check_apriv(gpu, MSM_BO_WC | MSM_BO_GPU_READONLY),
  81                gpu->aspace, &ring->bo, &ring->iova);
  82
  83        if (IS_ERR(ring->start)) {
  84                ret = PTR_ERR(ring->start);
  85                ring->start = NULL;
  86                goto fail;
  87        }
  88
  89        msm_gem_object_set_name(ring->bo, "ring%d", id);
  90
  91        ring->end   = ring->start + (MSM_GPU_RINGBUFFER_SZ >> 2);
  92        ring->next  = ring->start;
  93        ring->cur   = ring->start;
  94
  95        ring->memptrs = memptrs;
  96        ring->memptrs_iova = memptrs_iova;
  97
  98         /* currently managing hangcheck ourselves: */
  99        sched_timeout = MAX_SCHEDULE_TIMEOUT;
 100
 101        ret = drm_sched_init(&ring->sched, &msm_sched_ops,
 102                        num_hw_submissions, 0, sched_timeout,
 103                        NULL, NULL, to_msm_bo(ring->bo)->name, gpu->dev->dev);
 104        if (ret) {
 105                goto fail;
 106        }
 107
 108        INIT_LIST_HEAD(&ring->submits);
 109        spin_lock_init(&ring->submit_lock);
 110        spin_lock_init(&ring->preempt_lock);
 111
 112        snprintf(name, sizeof(name), "gpu-ring-%d", ring->id);
 113
 114        ring->fctx = msm_fence_context_alloc(gpu->dev, &ring->memptrs->fence, name);
 115
 116        return ring;
 117
 118fail:
 119        msm_ringbuffer_destroy(ring);
 120        return ERR_PTR(ret);
 121}
 122
 123void msm_ringbuffer_destroy(struct msm_ringbuffer *ring)
 124{
 125        if (IS_ERR_OR_NULL(ring))
 126                return;
 127
 128        drm_sched_fini(&ring->sched);
 129
 130        msm_fence_context_free(ring->fctx);
 131
 132        msm_gem_kernel_put(ring->bo, ring->gpu->aspace);
 133
 134        kfree(ring);
 135}
 136