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_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
  25static 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
  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
  54const 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
  60struct 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
 119fail:
 120        msm_ringbuffer_destroy(ring);
 121        return ERR_PTR(ret);
 122}
 123
 124void 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}
 137