1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2016 Intel Corporation 4 */ 5 6 #include "gem/i915_gem_context.h" 7 #include "gt/intel_ring.h" 8 9 #include "i915_drv.h" 10 #include "intel_context.h" 11 #include "intel_engine_pm.h" 12 13 #include "mock_engine.h" 14 #include "selftests/mock_request.h" 15 16 static int mock_timeline_pin(struct intel_timeline *tl) 17 { 18 int err; 19 20 if (WARN_ON(!i915_gem_object_trylock(tl->hwsp_ggtt->obj, NULL))) 21 return -EBUSY; 22 23 err = intel_timeline_pin_map(tl); 24 i915_gem_object_unlock(tl->hwsp_ggtt->obj); 25 if (err) 26 return err; 27 28 atomic_inc(&tl->pin_count); 29 return 0; 30 } 31 32 static void mock_timeline_unpin(struct intel_timeline *tl) 33 { 34 GEM_BUG_ON(!atomic_read(&tl->pin_count)); 35 atomic_dec(&tl->pin_count); 36 } 37 38 static struct i915_vma *create_ring_vma(struct i915_ggtt *ggtt, int size) 39 { 40 struct i915_address_space *vm = &ggtt->vm; 41 struct drm_i915_private *i915 = vm->i915; 42 struct drm_i915_gem_object *obj; 43 struct i915_vma *vma; 44 45 obj = i915_gem_object_create_internal(i915, size); 46 if (IS_ERR(obj)) 47 return ERR_CAST(obj); 48 49 vma = i915_vma_instance(obj, vm, NULL); 50 if (IS_ERR(vma)) 51 goto err; 52 53 return vma; 54 55 err: 56 i915_gem_object_put(obj); 57 return vma; 58 } 59 60 static struct intel_ring *mock_ring(struct intel_engine_cs *engine) 61 { 62 const unsigned long sz = PAGE_SIZE; 63 struct intel_ring *ring; 64 65 ring = kzalloc(sizeof(*ring) + sz, GFP_KERNEL); 66 if (!ring) 67 return NULL; 68 69 kref_init(&ring->ref); 70 ring->size = sz; 71 ring->effective_size = sz; 72 ring->vaddr = (void *)(ring + 1); 73 atomic_set(&ring->pin_count, 1); 74 75 ring->vma = create_ring_vma(engine->gt->ggtt, PAGE_SIZE); 76 if (IS_ERR(ring->vma)) { 77 kfree(ring); 78 return NULL; 79 } 80 81 intel_ring_update_space(ring); 82 83 return ring; 84 } 85 86 static void mock_ring_free(struct intel_ring *ring) 87 { 88 i915_vma_put(ring->vma); 89 90 kfree(ring); 91 } 92 93 static struct i915_request *first_request(struct mock_engine *engine) 94 { 95 return list_first_entry_or_null(&engine->hw_queue, 96 struct i915_request, 97 mock.link); 98 } 99 100 static void advance(struct i915_request *request) 101 { 102 list_del_init(&request->mock.link); 103 i915_request_mark_complete(request); 104 GEM_BUG_ON(!i915_request_completed(request)); 105 106 intel_engine_signal_breadcrumbs(request->engine); 107 } 108 109 static void hw_delay_complete(struct timer_list *t) 110 { 111 struct mock_engine *engine = from_timer(engine, t, hw_delay); 112 struct i915_request *request; 113 unsigned long flags; 114 115 spin_lock_irqsave(&engine->hw_lock, flags); 116 117 /* Timer fired, first request is complete */ 118 request = first_request(engine); 119 if (request) 120 advance(request); 121 122 /* 123 * Also immediately signal any subsequent 0-delay requests, but 124 * requeue the timer for the next delayed request. 125 */ 126 while ((request = first_request(engine))) { 127 if (request->mock.delay) { 128 mod_timer(&engine->hw_delay, 129 jiffies + request->mock.delay); 130 break; 131 } 132 133 advance(request); 134 } 135 136 spin_unlock_irqrestore(&engine->hw_lock, flags); 137 } 138 139 static void mock_context_unpin(struct intel_context *ce) 140 { 141 } 142 143 static void mock_context_post_unpin(struct intel_context *ce) 144 { 145 i915_vma_unpin(ce->ring->vma); 146 } 147 148 static void mock_context_destroy(struct kref *ref) 149 { 150 struct intel_context *ce = container_of(ref, typeof(*ce), ref); 151 152 GEM_BUG_ON(intel_context_is_pinned(ce)); 153 154 if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) { 155 mock_ring_free(ce->ring); 156 mock_timeline_unpin(ce->timeline); 157 } 158 159 intel_context_fini(ce); 160 intel_context_free(ce); 161 } 162 163 static int mock_context_alloc(struct intel_context *ce) 164 { 165 int err; 166 167 ce->ring = mock_ring(ce->engine); 168 if (!ce->ring) 169 return -ENOMEM; 170 171 ce->timeline = intel_timeline_create(ce->engine->gt); 172 if (IS_ERR(ce->timeline)) { 173 kfree(ce->engine); 174 return PTR_ERR(ce->timeline); 175 } 176 177 err = mock_timeline_pin(ce->timeline); 178 if (err) { 179 intel_timeline_put(ce->timeline); 180 ce->timeline = NULL; 181 return err; 182 } 183 184 return 0; 185 } 186 187 static int mock_context_pre_pin(struct intel_context *ce, 188 struct i915_gem_ww_ctx *ww, void **unused) 189 { 190 return i915_vma_pin_ww(ce->ring->vma, ww, 0, 0, PIN_GLOBAL | PIN_HIGH); 191 } 192 193 static int mock_context_pin(struct intel_context *ce, void *unused) 194 { 195 return 0; 196 } 197 198 static void mock_context_reset(struct intel_context *ce) 199 { 200 } 201 202 static const struct intel_context_ops mock_context_ops = { 203 .alloc = mock_context_alloc, 204 205 .pre_pin = mock_context_pre_pin, 206 .pin = mock_context_pin, 207 .unpin = mock_context_unpin, 208 .post_unpin = mock_context_post_unpin, 209 210 .enter = intel_context_enter_engine, 211 .exit = intel_context_exit_engine, 212 213 .reset = mock_context_reset, 214 .destroy = mock_context_destroy, 215 }; 216 217 static int mock_request_alloc(struct i915_request *request) 218 { 219 INIT_LIST_HEAD(&request->mock.link); 220 request->mock.delay = 0; 221 222 return 0; 223 } 224 225 static int mock_emit_flush(struct i915_request *request, 226 unsigned int flags) 227 { 228 return 0; 229 } 230 231 static u32 *mock_emit_breadcrumb(struct i915_request *request, u32 *cs) 232 { 233 return cs; 234 } 235 236 static void mock_submit_request(struct i915_request *request) 237 { 238 struct mock_engine *engine = 239 container_of(request->engine, typeof(*engine), base); 240 unsigned long flags; 241 242 i915_request_submit(request); 243 244 spin_lock_irqsave(&engine->hw_lock, flags); 245 list_add_tail(&request->mock.link, &engine->hw_queue); 246 if (list_is_first(&request->mock.link, &engine->hw_queue)) { 247 if (request->mock.delay) 248 mod_timer(&engine->hw_delay, 249 jiffies + request->mock.delay); 250 else 251 advance(request); 252 } 253 spin_unlock_irqrestore(&engine->hw_lock, flags); 254 } 255 256 static void mock_add_to_engine(struct i915_request *rq) 257 { 258 lockdep_assert_held(&rq->engine->sched_engine->lock); 259 list_move_tail(&rq->sched.link, &rq->engine->sched_engine->requests); 260 } 261 262 static void mock_remove_from_engine(struct i915_request *rq) 263 { 264 struct intel_engine_cs *engine, *locked; 265 266 /* 267 * Virtual engines complicate acquiring the engine timeline lock, 268 * as their rq->engine pointer is not stable until under that 269 * engine lock. The simple ploy we use is to take the lock then 270 * check that the rq still belongs to the newly locked engine. 271 */ 272 273 locked = READ_ONCE(rq->engine); 274 spin_lock_irq(&locked->sched_engine->lock); 275 while (unlikely(locked != (engine = READ_ONCE(rq->engine)))) { 276 spin_unlock(&locked->sched_engine->lock); 277 spin_lock(&engine->sched_engine->lock); 278 locked = engine; 279 } 280 list_del_init(&rq->sched.link); 281 spin_unlock_irq(&locked->sched_engine->lock); 282 } 283 284 static void mock_reset_prepare(struct intel_engine_cs *engine) 285 { 286 } 287 288 static void mock_reset_rewind(struct intel_engine_cs *engine, bool stalled) 289 { 290 GEM_BUG_ON(stalled); 291 } 292 293 static void mock_reset_cancel(struct intel_engine_cs *engine) 294 { 295 struct mock_engine *mock = 296 container_of(engine, typeof(*mock), base); 297 struct i915_request *rq; 298 unsigned long flags; 299 300 del_timer_sync(&mock->hw_delay); 301 302 spin_lock_irqsave(&engine->sched_engine->lock, flags); 303 304 /* Mark all submitted requests as skipped. */ 305 list_for_each_entry(rq, &engine->sched_engine->requests, sched.link) 306 i915_request_put(i915_request_mark_eio(rq)); 307 intel_engine_signal_breadcrumbs(engine); 308 309 /* Cancel and submit all pending requests. */ 310 list_for_each_entry(rq, &mock->hw_queue, mock.link) { 311 if (i915_request_mark_eio(rq)) { 312 __i915_request_submit(rq); 313 i915_request_put(rq); 314 } 315 } 316 INIT_LIST_HEAD(&mock->hw_queue); 317 318 spin_unlock_irqrestore(&engine->sched_engine->lock, flags); 319 } 320 321 static void mock_reset_finish(struct intel_engine_cs *engine) 322 { 323 } 324 325 static void mock_engine_release(struct intel_engine_cs *engine) 326 { 327 struct mock_engine *mock = 328 container_of(engine, typeof(*mock), base); 329 330 GEM_BUG_ON(timer_pending(&mock->hw_delay)); 331 332 i915_sched_engine_put(engine->sched_engine); 333 intel_breadcrumbs_put(engine->breadcrumbs); 334 335 intel_context_unpin(engine->kernel_context); 336 intel_context_put(engine->kernel_context); 337 338 intel_engine_fini_retire(engine); 339 } 340 341 struct intel_engine_cs *mock_engine(struct drm_i915_private *i915, 342 const char *name, 343 int id) 344 { 345 struct mock_engine *engine; 346 347 GEM_BUG_ON(id >= I915_NUM_ENGINES); 348 GEM_BUG_ON(!to_gt(i915)->uncore); 349 350 engine = kzalloc(sizeof(*engine) + PAGE_SIZE, GFP_KERNEL); 351 if (!engine) 352 return NULL; 353 354 /* minimal engine setup for requests */ 355 engine->base.i915 = i915; 356 engine->base.gt = to_gt(i915); 357 engine->base.uncore = to_gt(i915)->uncore; 358 snprintf(engine->base.name, sizeof(engine->base.name), "%s", name); 359 engine->base.id = id; 360 engine->base.mask = BIT(id); 361 engine->base.legacy_idx = INVALID_ENGINE; 362 engine->base.instance = id; 363 engine->base.status_page.addr = (void *)(engine + 1); 364 365 engine->base.cops = &mock_context_ops; 366 engine->base.request_alloc = mock_request_alloc; 367 engine->base.emit_flush = mock_emit_flush; 368 engine->base.emit_fini_breadcrumb = mock_emit_breadcrumb; 369 engine->base.submit_request = mock_submit_request; 370 engine->base.add_active_request = mock_add_to_engine; 371 engine->base.remove_active_request = mock_remove_from_engine; 372 373 engine->base.reset.prepare = mock_reset_prepare; 374 engine->base.reset.rewind = mock_reset_rewind; 375 engine->base.reset.cancel = mock_reset_cancel; 376 engine->base.reset.finish = mock_reset_finish; 377 378 engine->base.release = mock_engine_release; 379 380 to_gt(i915)->engine[id] = &engine->base; 381 to_gt(i915)->engine_class[0][id] = &engine->base; 382 383 /* fake hw queue */ 384 spin_lock_init(&engine->hw_lock); 385 timer_setup(&engine->hw_delay, hw_delay_complete, 0); 386 INIT_LIST_HEAD(&engine->hw_queue); 387 388 intel_engine_add_user(&engine->base); 389 390 return &engine->base; 391 } 392 393 int mock_engine_init(struct intel_engine_cs *engine) 394 { 395 struct intel_context *ce; 396 397 INIT_LIST_HEAD(&engine->pinned_contexts_list); 398 399 engine->sched_engine = i915_sched_engine_create(ENGINE_MOCK); 400 if (!engine->sched_engine) 401 return -ENOMEM; 402 engine->sched_engine->private_data = engine; 403 404 intel_engine_init_execlists(engine); 405 intel_engine_init__pm(engine); 406 intel_engine_init_retire(engine); 407 408 engine->breadcrumbs = intel_breadcrumbs_create(NULL); 409 if (!engine->breadcrumbs) 410 goto err_schedule; 411 412 ce = create_kernel_context(engine); 413 if (IS_ERR(ce)) 414 goto err_breadcrumbs; 415 416 /* We insist the kernel context is using the status_page */ 417 engine->status_page.vma = ce->timeline->hwsp_ggtt; 418 419 engine->kernel_context = ce; 420 return 0; 421 422 err_breadcrumbs: 423 intel_breadcrumbs_put(engine->breadcrumbs); 424 err_schedule: 425 i915_sched_engine_put(engine->sched_engine); 426 return -ENOMEM; 427 } 428 429 void mock_engine_flush(struct intel_engine_cs *engine) 430 { 431 struct mock_engine *mock = 432 container_of(engine, typeof(*mock), base); 433 struct i915_request *request, *rn; 434 435 del_timer_sync(&mock->hw_delay); 436 437 spin_lock_irq(&mock->hw_lock); 438 list_for_each_entry_safe(request, rn, &mock->hw_queue, mock.link) 439 advance(request); 440 spin_unlock_irq(&mock->hw_lock); 441 } 442 443 void mock_engine_reset(struct intel_engine_cs *engine) 444 { 445 } 446