1 /* $NetBSD: mock_engine.c,v 1.2 2021/12/18 23:45:30 riastradh Exp $ */ 2 3 /* 4 * Copyright 2016 Intel Corporation 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice (including the next 14 * paragraph) shall be included in all copies or substantial portions of the 15 * Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 22 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 23 * IN THE SOFTWARE. 24 * 25 */ 26 27 #include <sys/cdefs.h> 28 __KERNEL_RCSID(0, "$NetBSD: mock_engine.c,v 1.2 2021/12/18 23:45:30 riastradh Exp $"); 29 30 #include "gem/i915_gem_context.h" 31 #include "gt/intel_ring.h" 32 33 #include "i915_drv.h" 34 #include "intel_context.h" 35 #include "intel_engine_pm.h" 36 #include "intel_engine_pool.h" 37 38 #include "mock_engine.h" 39 #include "selftests/mock_request.h" 40 41 static void mock_timeline_pin(struct intel_timeline *tl) 42 { 43 atomic_inc(&tl->pin_count); 44 } 45 46 static void mock_timeline_unpin(struct intel_timeline *tl) 47 { 48 GEM_BUG_ON(!atomic_read(&tl->pin_count)); 49 atomic_dec(&tl->pin_count); 50 } 51 52 static struct intel_ring *mock_ring(struct intel_engine_cs *engine) 53 { 54 const unsigned long sz = PAGE_SIZE / 2; 55 struct intel_ring *ring; 56 57 ring = kzalloc(sizeof(*ring) + sz, GFP_KERNEL); 58 if (!ring) 59 return NULL; 60 61 kref_init(&ring->ref); 62 ring->size = sz; 63 ring->effective_size = sz; 64 ring->vaddr = (void *)(ring + 1); 65 atomic_set(&ring->pin_count, 1); 66 67 ring->vma = i915_vma_alloc(); 68 if (!ring->vma) { 69 kfree(ring); 70 return NULL; 71 } 72 i915_active_init(&ring->vma->active, NULL, NULL); 73 74 intel_ring_update_space(ring); 75 76 return ring; 77 } 78 79 static void mock_ring_free(struct intel_ring *ring) 80 { 81 i915_active_fini(&ring->vma->active); 82 i915_vma_free(ring->vma); 83 84 kfree(ring); 85 } 86 87 static struct i915_request *first_request(struct mock_engine *engine) 88 { 89 return list_first_entry_or_null(&engine->hw_queue, 90 struct i915_request, 91 mock.link); 92 } 93 94 static void advance(struct i915_request *request) 95 { 96 list_del_init(&request->mock.link); 97 i915_request_mark_complete(request); 98 GEM_BUG_ON(!i915_request_completed(request)); 99 100 intel_engine_signal_breadcrumbs(request->engine); 101 } 102 103 static void hw_delay_complete(struct timer_list *t) 104 { 105 struct mock_engine *engine = from_timer(engine, t, hw_delay); 106 struct i915_request *request; 107 unsigned long flags; 108 109 spin_lock_irqsave(&engine->hw_lock, flags); 110 111 /* Timer fired, first request is complete */ 112 request = first_request(engine); 113 if (request) 114 advance(request); 115 116 /* 117 * Also immediately signal any subsequent 0-delay requests, but 118 * requeue the timer for the next delayed request. 119 */ 120 while ((request = first_request(engine))) { 121 if (request->mock.delay) { 122 mod_timer(&engine->hw_delay, 123 jiffies + request->mock.delay); 124 break; 125 } 126 127 advance(request); 128 } 129 130 spin_unlock_irqrestore(&engine->hw_lock, flags); 131 } 132 133 static void mock_context_unpin(struct intel_context *ce) 134 { 135 } 136 137 static void mock_context_destroy(struct kref *ref) 138 { 139 struct intel_context *ce = container_of(ref, typeof(*ce), ref); 140 141 GEM_BUG_ON(intel_context_is_pinned(ce)); 142 143 if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) { 144 mock_ring_free(ce->ring); 145 mock_timeline_unpin(ce->timeline); 146 } 147 148 intel_context_fini(ce); 149 intel_context_free(ce); 150 } 151 152 static int mock_context_alloc(struct intel_context *ce) 153 { 154 ce->ring = mock_ring(ce->engine); 155 if (!ce->ring) 156 return -ENOMEM; 157 158 GEM_BUG_ON(ce->timeline); 159 ce->timeline = intel_timeline_create(ce->engine->gt, NULL); 160 if (IS_ERR(ce->timeline)) { 161 kfree(ce->engine); 162 return PTR_ERR(ce->timeline); 163 } 164 165 mock_timeline_pin(ce->timeline); 166 167 return 0; 168 } 169 170 static int mock_context_pin(struct intel_context *ce) 171 { 172 return 0; 173 } 174 175 static void mock_context_reset(struct intel_context *ce) 176 { 177 } 178 179 static const struct intel_context_ops mock_context_ops = { 180 .alloc = mock_context_alloc, 181 182 .pin = mock_context_pin, 183 .unpin = mock_context_unpin, 184 185 .enter = intel_context_enter_engine, 186 .exit = intel_context_exit_engine, 187 188 .reset = mock_context_reset, 189 .destroy = mock_context_destroy, 190 }; 191 192 static int mock_request_alloc(struct i915_request *request) 193 { 194 INIT_LIST_HEAD(&request->mock.link); 195 request->mock.delay = 0; 196 197 return 0; 198 } 199 200 static int mock_emit_flush(struct i915_request *request, 201 unsigned int flags) 202 { 203 return 0; 204 } 205 206 static u32 *mock_emit_breadcrumb(struct i915_request *request, u32 *cs) 207 { 208 return cs; 209 } 210 211 static void mock_submit_request(struct i915_request *request) 212 { 213 struct mock_engine *engine = 214 container_of(request->engine, typeof(*engine), base); 215 unsigned long flags; 216 217 i915_request_submit(request); 218 219 spin_lock_irqsave(&engine->hw_lock, flags); 220 list_add_tail(&request->mock.link, &engine->hw_queue); 221 if (list_is_first(&request->mock.link, &engine->hw_queue)) { 222 if (request->mock.delay) 223 mod_timer(&engine->hw_delay, 224 jiffies + request->mock.delay); 225 else 226 advance(request); 227 } 228 spin_unlock_irqrestore(&engine->hw_lock, flags); 229 } 230 231 static void mock_reset_prepare(struct intel_engine_cs *engine) 232 { 233 } 234 235 static void mock_reset_rewind(struct intel_engine_cs *engine, bool stalled) 236 { 237 GEM_BUG_ON(stalled); 238 } 239 240 static void mock_reset_cancel(struct intel_engine_cs *engine) 241 { 242 struct i915_request *request; 243 unsigned long flags; 244 245 spin_lock_irqsave(&engine->active.lock, flags); 246 247 /* Mark all submitted requests as skipped. */ 248 list_for_each_entry(request, &engine->active.requests, sched.link) { 249 if (!i915_request_signaled(request)) 250 dma_fence_set_error(&request->fence, -EIO); 251 252 i915_request_mark_complete(request); 253 } 254 255 spin_unlock_irqrestore(&engine->active.lock, flags); 256 } 257 258 static void mock_reset_finish(struct intel_engine_cs *engine) 259 { 260 } 261 262 static void mock_engine_release(struct intel_engine_cs *engine) 263 { 264 struct mock_engine *mock = 265 container_of(engine, typeof(*mock), base); 266 267 GEM_BUG_ON(timer_pending(&mock->hw_delay)); 268 269 intel_context_unpin(engine->kernel_context); 270 intel_context_put(engine->kernel_context); 271 272 intel_engine_fini_retire(engine); 273 intel_engine_fini_breadcrumbs(engine); 274 } 275 276 struct intel_engine_cs *mock_engine(struct drm_i915_private *i915, 277 const char *name, 278 int id) 279 { 280 struct mock_engine *engine; 281 282 GEM_BUG_ON(id >= I915_NUM_ENGINES); 283 GEM_BUG_ON(!i915->gt.uncore); 284 285 engine = kzalloc(sizeof(*engine) + PAGE_SIZE, GFP_KERNEL); 286 if (!engine) 287 return NULL; 288 289 /* minimal engine setup for requests */ 290 engine->base.i915 = i915; 291 engine->base.gt = &i915->gt; 292 engine->base.uncore = i915->gt.uncore; 293 snprintf(engine->base.name, sizeof(engine->base.name), "%s", name); 294 engine->base.id = id; 295 engine->base.mask = BIT(id); 296 engine->base.legacy_idx = INVALID_ENGINE; 297 engine->base.instance = id; 298 engine->base.status_page.addr = (void *)(engine + 1); 299 300 engine->base.cops = &mock_context_ops; 301 engine->base.request_alloc = mock_request_alloc; 302 engine->base.emit_flush = mock_emit_flush; 303 engine->base.emit_fini_breadcrumb = mock_emit_breadcrumb; 304 engine->base.submit_request = mock_submit_request; 305 306 engine->base.reset.prepare = mock_reset_prepare; 307 engine->base.reset.rewind = mock_reset_rewind; 308 engine->base.reset.cancel = mock_reset_cancel; 309 engine->base.reset.finish = mock_reset_finish; 310 311 engine->base.release = mock_engine_release; 312 313 i915->gt.engine[id] = &engine->base; 314 i915->gt.engine_class[0][id] = &engine->base; 315 316 /* fake hw queue */ 317 spin_lock_init(&engine->hw_lock); 318 timer_setup(&engine->hw_delay, hw_delay_complete, 0); 319 INIT_LIST_HEAD(&engine->hw_queue); 320 321 intel_engine_add_user(&engine->base); 322 323 return &engine->base; 324 } 325 326 int mock_engine_init(struct intel_engine_cs *engine) 327 { 328 struct intel_context *ce; 329 330 intel_engine_init_active(engine, ENGINE_MOCK); 331 intel_engine_init_breadcrumbs(engine); 332 intel_engine_init_execlists(engine); 333 intel_engine_init__pm(engine); 334 intel_engine_init_retire(engine); 335 intel_engine_pool_init(&engine->pool); 336 337 ce = create_kernel_context(engine); 338 if (IS_ERR(ce)) 339 goto err_breadcrumbs; 340 341 engine->kernel_context = ce; 342 return 0; 343 344 err_breadcrumbs: 345 intel_engine_fini_breadcrumbs(engine); 346 return -ENOMEM; 347 } 348 349 void mock_engine_flush(struct intel_engine_cs *engine) 350 { 351 struct mock_engine *mock = 352 container_of(engine, typeof(*mock), base); 353 struct i915_request *request, *rn; 354 355 del_timer_sync(&mock->hw_delay); 356 357 spin_lock_irq(&mock->hw_lock); 358 list_for_each_entry_safe(request, rn, &mock->hw_queue, mock.link) 359 advance(request); 360 spin_unlock_irq(&mock->hw_lock); 361 } 362 363 void mock_engine_reset(struct intel_engine_cs *engine) 364 { 365 } 366
Indexes created Sat Sep 20 22:09:52 GMT 2025