1 // SPDX-License-Identifier: GPL-2.0+ 2 /* Copyright (C) 2018 Broadcom */ 3 4 /** 5 * DOC: Broadcom V3D scheduling 6 * 7 * The shared DRM GPU scheduler is used to coordinate submitting jobs 8 * to the hardware. Each DRM fd (roughly a client process) gets its 9 * own scheduler entity, which will process jobs in order. The GPU 10 * scheduler will round-robin between clients to submit the next job. 11 * 12 * For simplicity, and in order to keep latency low for interactive 13 * jobs when bulk background jobs are queued up, we submit a new job 14 * to the HW only when it has completed the last one, instead of 15 * filling up the CT[01]Q FIFOs with jobs. Similarly, we use 16 * v3d_job_dependency() to manage the dependency between bin and 17 * render, instead of having the clients submit jobs using the HW's 18 * semaphores to interlock between them. 19 */ 20 21 #include <linux/kthread.h> 22 23 #include "v3d_drv.h" 24 #include "v3d_regs.h" 25 #include "v3d_trace.h" 26 27 static struct v3d_job * 28 to_v3d_job(struct drm_sched_job *sched_job) 29 { 30 return container_of(sched_job, struct v3d_job, base); 31 } 32 33 static struct v3d_tfu_job * 34 to_tfu_job(struct drm_sched_job *sched_job) 35 { 36 return container_of(sched_job, struct v3d_tfu_job, base); 37 } 38 39 static void 40 v3d_job_free(struct drm_sched_job *sched_job) 41 { 42 struct v3d_job *job = to_v3d_job(sched_job); 43 44 drm_sched_job_cleanup(sched_job); 45 46 v3d_exec_put(job->exec); 47 } 48 49 static void 50 v3d_tfu_job_free(struct drm_sched_job *sched_job) 51 { 52 struct v3d_tfu_job *job = to_tfu_job(sched_job); 53 54 drm_sched_job_cleanup(sched_job); 55 56 v3d_tfu_job_put(job); 57 } 58 59 /** 60 * Returns the fences that the bin or render job depends on, one by one. 61 * v3d_job_run() won't be called until all of them have been signaled. 62 */ 63 static struct dma_fence * 64 v3d_job_dependency(struct drm_sched_job *sched_job, 65 struct drm_sched_entity *s_entity) 66 { 67 struct v3d_job *job = to_v3d_job(sched_job); 68 struct v3d_exec_info *exec = job->exec; 69 enum v3d_queue q = job == &exec->bin ? V3D_BIN : V3D_RENDER; 70 struct dma_fence *fence; 71 72 fence = job->in_fence; 73 if (fence) { 74 job->in_fence = NULL; 75 return fence; 76 } 77 78 if (q == V3D_RENDER) { 79 /* If we had a bin job, the render job definitely depends on 80 * it. We first have to wait for bin to be scheduled, so that 81 * its done_fence is created. 82 */ 83 fence = exec->bin_done_fence; 84 if (fence) { 85 exec->bin_done_fence = NULL; 86 return fence; 87 } 88 } 89 90 /* XXX: Wait on a fence for switching the GMP if necessary, 91 * and then do so. 92 */ 93 94 return fence; 95 } 96 97 /** 98 * Returns the fences that the TFU job depends on, one by one. 99 * v3d_tfu_job_run() won't be called until all of them have been 100 * signaled. 101 */ 102 static struct dma_fence * 103 v3d_tfu_job_dependency(struct drm_sched_job *sched_job, 104 struct drm_sched_entity *s_entity) 105 { 106 struct v3d_tfu_job *job = to_tfu_job(sched_job); 107 struct dma_fence *fence; 108 109 fence = job->in_fence; 110 if (fence) { 111 job->in_fence = NULL; 112 return fence; 113 } 114 115 return NULL; 116 } 117 118 static struct dma_fence *v3d_job_run(struct drm_sched_job *sched_job) 119 { 120 struct v3d_job *job = to_v3d_job(sched_job); 121 struct v3d_exec_info *exec = job->exec; 122 enum v3d_queue q = job == &exec->bin ? V3D_BIN : V3D_RENDER; 123 struct v3d_dev *v3d = exec->v3d; 124 struct drm_device *dev = &v3d->drm; 125 struct dma_fence *fence; 126 unsigned long irqflags; 127 128 if (unlikely(job->base.s_fence->finished.error)) 129 return NULL; 130 131 /* Lock required around bin_job update vs 132 * v3d_overflow_mem_work(). 133 */ 134 spin_lock_irqsave(&v3d->job_lock, irqflags); 135 if (q == V3D_BIN) { 136 v3d->bin_job = job->exec; 137 138 /* Clear out the overflow allocation, so we don't 139 * reuse the overflow attached to a previous job. 140 */ 141 V3D_CORE_WRITE(0, V3D_PTB_BPOS, 0); 142 } else { 143 v3d->render_job = job->exec; 144 } 145 spin_unlock_irqrestore(&v3d->job_lock, irqflags); 146 147 /* Can we avoid this flush when q==RENDER? We need to be 148 * careful of scheduling, though -- imagine job0 rendering to 149 * texture and job1 reading, and them being executed as bin0, 150 * bin1, render0, render1, so that render1's flush at bin time 151 * wasn't enough. 152 */ 153 v3d_invalidate_caches(v3d); 154 155 fence = v3d_fence_create(v3d, q); 156 if (IS_ERR(fence)) 157 return NULL; 158 159 if (job->irq_fence) 160 dma_fence_put(job->irq_fence); 161 job->irq_fence = dma_fence_get(fence); 162 163 trace_v3d_submit_cl(dev, q == V3D_RENDER, to_v3d_fence(fence)->seqno, 164 job->start, job->end); 165 166 if (q == V3D_BIN) { 167 if (exec->qma) { 168 V3D_CORE_WRITE(0, V3D_CLE_CT0QMA, exec->qma); 169 V3D_CORE_WRITE(0, V3D_CLE_CT0QMS, exec->qms); 170 } 171 if (exec->qts) { 172 V3D_CORE_WRITE(0, V3D_CLE_CT0QTS, 173 V3D_CLE_CT0QTS_ENABLE | 174 exec->qts); 175 } 176 } else { 177 /* XXX: Set the QCFG */ 178 } 179 180 /* Set the current and end address of the control list. 181 * Writing the end register is what starts the job. 182 */ 183 V3D_CORE_WRITE(0, V3D_CLE_CTNQBA(q), job->start); 184 V3D_CORE_WRITE(0, V3D_CLE_CTNQEA(q), job->end); 185 186 return fence; 187 } 188 189 static struct dma_fence * 190 v3d_tfu_job_run(struct drm_sched_job *sched_job) 191 { 192 struct v3d_tfu_job *job = to_tfu_job(sched_job); 193 struct v3d_dev *v3d = job->v3d; 194 struct drm_device *dev = &v3d->drm; 195 struct dma_fence *fence; 196 197 fence = v3d_fence_create(v3d, V3D_TFU); 198 if (IS_ERR(fence)) 199 return NULL; 200 201 v3d->tfu_job = job; 202 if (job->irq_fence) 203 dma_fence_put(job->irq_fence); 204 job->irq_fence = dma_fence_get(fence); 205 206 trace_v3d_submit_tfu(dev, to_v3d_fence(fence)->seqno); 207 208 V3D_WRITE(V3D_TFU_IIA, job->args.iia); 209 V3D_WRITE(V3D_TFU_IIS, job->args.iis); 210 V3D_WRITE(V3D_TFU_ICA, job->args.ica); 211 V3D_WRITE(V3D_TFU_IUA, job->args.iua); 212 V3D_WRITE(V3D_TFU_IOA, job->args.ioa); 213 V3D_WRITE(V3D_TFU_IOS, job->args.ios); 214 V3D_WRITE(V3D_TFU_COEF0, job->args.coef[0]); 215 if (job->args.coef[0] & V3D_TFU_COEF0_USECOEF) { 216 V3D_WRITE(V3D_TFU_COEF1, job->args.coef[1]); 217 V3D_WRITE(V3D_TFU_COEF2, job->args.coef[2]); 218 V3D_WRITE(V3D_TFU_COEF3, job->args.coef[3]); 219 } 220 /* ICFG kicks off the job. */ 221 V3D_WRITE(V3D_TFU_ICFG, job->args.icfg | V3D_TFU_ICFG_IOC); 222 223 return fence; 224 } 225 226 static void 227 v3d_gpu_reset_for_timeout(struct v3d_dev *v3d, struct drm_sched_job *sched_job) 228 { 229 enum v3d_queue q; 230 231 mutex_lock(&v3d->reset_lock); 232 233 /* block scheduler */ 234 for (q = 0; q < V3D_MAX_QUEUES; q++) 235 drm_sched_stop(&v3d->queue[q].sched); 236 237 if (sched_job) 238 drm_sched_increase_karma(sched_job); 239 240 /* get the GPU back into the init state */ 241 v3d_reset(v3d); 242 243 for (q = 0; q < V3D_MAX_QUEUES; q++) 244 drm_sched_resubmit_jobs(&v3d->queue[q].sched); 245 246 /* Unblock schedulers and restart their jobs. */ 247 for (q = 0; q < V3D_MAX_QUEUES; q++) { 248 drm_sched_start(&v3d->queue[q].sched, true); 249 } 250 251 mutex_unlock(&v3d->reset_lock); 252 } 253 254 static void 255 v3d_job_timedout(struct drm_sched_job *sched_job) 256 { 257 struct v3d_job *job = to_v3d_job(sched_job); 258 struct v3d_exec_info *exec = job->exec; 259 struct v3d_dev *v3d = exec->v3d; 260 enum v3d_queue job_q = job == &exec->bin ? V3D_BIN : V3D_RENDER; 261 u32 ctca = V3D_CORE_READ(0, V3D_CLE_CTNCA(job_q)); 262 u32 ctra = V3D_CORE_READ(0, V3D_CLE_CTNRA(job_q)); 263 264 /* If the current address or return address have changed, then 265 * the GPU has probably made progress and we should delay the 266 * reset. This could fail if the GPU got in an infinite loop 267 * in the CL, but that is pretty unlikely outside of an i-g-t 268 * testcase. 269 */ 270 if (job->timedout_ctca != ctca || job->timedout_ctra != ctra) { 271 job->timedout_ctca = ctca; 272 job->timedout_ctra = ctra; 273 return; 274 } 275 276 v3d_gpu_reset_for_timeout(v3d, sched_job); 277 } 278 279 static void 280 v3d_tfu_job_timedout(struct drm_sched_job *sched_job) 281 { 282 struct v3d_tfu_job *job = to_tfu_job(sched_job); 283 284 v3d_gpu_reset_for_timeout(job->v3d, sched_job); 285 } 286 287 static const struct drm_sched_backend_ops v3d_sched_ops = { 288 .dependency = v3d_job_dependency, 289 .run_job = v3d_job_run, 290 .timedout_job = v3d_job_timedout, 291 .free_job = v3d_job_free 292 }; 293 294 static const struct drm_sched_backend_ops v3d_tfu_sched_ops = { 295 .dependency = v3d_tfu_job_dependency, 296 .run_job = v3d_tfu_job_run, 297 .timedout_job = v3d_tfu_job_timedout, 298 .free_job = v3d_tfu_job_free 299 }; 300 301 int 302 v3d_sched_init(struct v3d_dev *v3d) 303 { 304 int hw_jobs_limit = 1; 305 int job_hang_limit = 0; 306 int hang_limit_ms = 500; 307 int ret; 308 309 ret = drm_sched_init(&v3d->queue[V3D_BIN].sched, 310 &v3d_sched_ops, 311 hw_jobs_limit, job_hang_limit, 312 msecs_to_jiffies(hang_limit_ms), 313 "v3d_bin"); 314 if (ret) { 315 dev_err(v3d->dev, "Failed to create bin scheduler: %d.", ret); 316 return ret; 317 } 318 319 ret = drm_sched_init(&v3d->queue[V3D_RENDER].sched, 320 &v3d_sched_ops, 321 hw_jobs_limit, job_hang_limit, 322 msecs_to_jiffies(hang_limit_ms), 323 "v3d_render"); 324 if (ret) { 325 dev_err(v3d->dev, "Failed to create render scheduler: %d.", 326 ret); 327 drm_sched_fini(&v3d->queue[V3D_BIN].sched); 328 return ret; 329 } 330 331 ret = drm_sched_init(&v3d->queue[V3D_TFU].sched, 332 &v3d_tfu_sched_ops, 333 hw_jobs_limit, job_hang_limit, 334 msecs_to_jiffies(hang_limit_ms), 335 "v3d_tfu"); 336 if (ret) { 337 dev_err(v3d->dev, "Failed to create TFU scheduler: %d.", 338 ret); 339 drm_sched_fini(&v3d->queue[V3D_RENDER].sched); 340 drm_sched_fini(&v3d->queue[V3D_BIN].sched); 341 return ret; 342 } 343 344 return 0; 345 } 346 347 void 348 v3d_sched_fini(struct v3d_dev *v3d) 349 { 350 enum v3d_queue q; 351 352 for (q = 0; q < V3D_MAX_QUEUES; q++) 353 drm_sched_fini(&v3d->queue[q].sched); 354 } 355