1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2017 Etnaviv Project 4 */ 5 6 #include <linux/kthread.h> 7 8 #include "etnaviv_drv.h" 9 #include "etnaviv_dump.h" 10 #include "etnaviv_gem.h" 11 #include "etnaviv_gpu.h" 12 #include "etnaviv_sched.h" 13 #include "state.xml.h" 14 15 static int etnaviv_job_hang_limit = 0; 16 module_param_named(job_hang_limit, etnaviv_job_hang_limit, int , 0444); 17 static int etnaviv_hw_jobs_limit = 4; 18 module_param_named(hw_job_limit, etnaviv_hw_jobs_limit, int , 0444); 19 20 static struct dma_fence * 21 etnaviv_sched_dependency(struct drm_sched_job *sched_job, 22 struct drm_sched_entity *entity) 23 { 24 struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job); 25 struct dma_fence *fence; 26 int i; 27 28 if (unlikely(submit->in_fence)) { 29 fence = submit->in_fence; 30 submit->in_fence = NULL; 31 32 if (!dma_fence_is_signaled(fence)) 33 return fence; 34 35 dma_fence_put(fence); 36 } 37 38 for (i = 0; i < submit->nr_bos; i++) { 39 struct etnaviv_gem_submit_bo *bo = &submit->bos[i]; 40 int j; 41 42 if (bo->excl) { 43 fence = bo->excl; 44 bo->excl = NULL; 45 46 if (!dma_fence_is_signaled(fence)) 47 return fence; 48 49 dma_fence_put(fence); 50 } 51 52 for (j = 0; j < bo->nr_shared; j++) { 53 if (!bo->shared[j]) 54 continue; 55 56 fence = bo->shared[j]; 57 bo->shared[j] = NULL; 58 59 if (!dma_fence_is_signaled(fence)) 60 return fence; 61 62 dma_fence_put(fence); 63 } 64 kfree(bo->shared); 65 bo->nr_shared = 0; 66 bo->shared = NULL; 67 } 68 69 return NULL; 70 } 71 72 static struct dma_fence *etnaviv_sched_run_job(struct drm_sched_job *sched_job) 73 { 74 struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job); 75 struct dma_fence *fence = NULL; 76 77 if (likely(!sched_job->s_fence->finished.error)) 78 fence = etnaviv_gpu_submit(submit); 79 else 80 dev_dbg(submit->gpu->dev, "skipping bad job\n"); 81 82 return fence; 83 } 84 85 static void etnaviv_sched_timedout_job(struct drm_sched_job *sched_job) 86 { 87 struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job); 88 struct etnaviv_gpu *gpu = submit->gpu; 89 u32 dma_addr; 90 int change; 91 92 /* 93 * If the GPU managed to complete this jobs fence, the timout is 94 * spurious. Bail out. 95 */ 96 if (dma_fence_is_signaled(submit->out_fence)) 97 return; 98 99 /* 100 * If the GPU is still making forward progress on the front-end (which 101 * should never loop) we shift out the timeout to give it a chance to 102 * finish the job. 103 */ 104 dma_addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS); 105 change = dma_addr - gpu->hangcheck_dma_addr; 106 if (change < 0 || change > 16) { 107 gpu->hangcheck_dma_addr = dma_addr; 108 schedule_delayed_work(&sched_job->sched->work_tdr, 109 sched_job->sched->timeout); 110 return; 111 } 112 113 /* block scheduler */ 114 kthread_park(gpu->sched.thread); 115 drm_sched_hw_job_reset(&gpu->sched, sched_job); 116 117 /* get the GPU back into the init state */ 118 etnaviv_core_dump(gpu); 119 etnaviv_gpu_recover_hang(gpu); 120 121 /* restart scheduler after GPU is usable again */ 122 drm_sched_job_recovery(&gpu->sched); 123 kthread_unpark(gpu->sched.thread); 124 } 125 126 static void etnaviv_sched_free_job(struct drm_sched_job *sched_job) 127 { 128 struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job); 129 130 etnaviv_submit_put(submit); 131 } 132 133 static const struct drm_sched_backend_ops etnaviv_sched_ops = { 134 .dependency = etnaviv_sched_dependency, 135 .run_job = etnaviv_sched_run_job, 136 .timedout_job = etnaviv_sched_timedout_job, 137 .free_job = etnaviv_sched_free_job, 138 }; 139 140 int etnaviv_sched_push_job(struct drm_sched_entity *sched_entity, 141 struct etnaviv_gem_submit *submit) 142 { 143 int ret = 0; 144 145 /* 146 * Hold the fence lock across the whole operation to avoid jobs being 147 * pushed out of order with regard to their sched fence seqnos as 148 * allocated in drm_sched_job_init. 149 */ 150 mutex_lock(&submit->gpu->fence_lock); 151 152 ret = drm_sched_job_init(&submit->sched_job, sched_entity, 153 submit->cmdbuf.ctx); 154 if (ret) 155 goto out_unlock; 156 157 submit->out_fence = dma_fence_get(&submit->sched_job.s_fence->finished); 158 submit->out_fence_id = idr_alloc_cyclic(&submit->gpu->fence_idr, 159 submit->out_fence, 0, 160 INT_MAX, GFP_KERNEL); 161 if (submit->out_fence_id < 0) { 162 ret = -ENOMEM; 163 goto out_unlock; 164 } 165 166 /* the scheduler holds on to the job now */ 167 kref_get(&submit->refcount); 168 169 drm_sched_entity_push_job(&submit->sched_job, sched_entity); 170 171 out_unlock: 172 mutex_unlock(&submit->gpu->fence_lock); 173 174 return ret; 175 } 176 177 int etnaviv_sched_init(struct etnaviv_gpu *gpu) 178 { 179 int ret; 180 181 ret = drm_sched_init(&gpu->sched, &etnaviv_sched_ops, 182 etnaviv_hw_jobs_limit, etnaviv_job_hang_limit, 183 msecs_to_jiffies(500), dev_name(gpu->dev)); 184 if (ret) 185 return ret; 186 187 return 0; 188 } 189 190 void etnaviv_sched_fini(struct etnaviv_gpu *gpu) 191 { 192 drm_sched_fini(&gpu->sched); 193 } 194