1 /* 2 * Copyright © 2016 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 * 23 */ 24 25 #include "gem/i915_gem_context.h" 26 #include "gt/intel_ring.h" 27 28 #include "i915_drv.h" 29 #include "intel_context.h" 30 #include "intel_engine_pm.h" 31 32 #include "mock_engine.h" 33 #include "selftests/mock_request.h" 34 35 static void mock_timeline_pin(struct intel_timeline *tl) 36 { 37 atomic_inc(&tl->pin_count); 38 } 39 40 static void mock_timeline_unpin(struct intel_timeline *tl) 41 { 42 GEM_BUG_ON(!atomic_read(&tl->pin_count)); 43 atomic_dec(&tl->pin_count); 44 } 45 46 static struct intel_ring *mock_ring(struct intel_engine_cs *engine) 47 { 48 const unsigned long sz = PAGE_SIZE / 2; 49 struct intel_ring *ring; 50 51 ring = kzalloc(sizeof(*ring) + sz, GFP_KERNEL); 52 if (!ring) 53 return NULL; 54 55 kref_init(&ring->ref); 56 ring->size = sz; 57 ring->effective_size = sz; 58 ring->vaddr = (void *)(ring + 1); 59 atomic_set(&ring->pin_count, 1); 60 61 ring->vma = i915_vma_alloc(); 62 if (!ring->vma) { 63 kfree(ring); 64 return NULL; 65 } 66 i915_active_init(&ring->vma->active, NULL, NULL); 67 __set_bit(I915_VMA_GGTT_BIT, __i915_vma_flags(ring->vma)); 68 __set_bit(DRM_MM_NODE_ALLOCATED_BIT, &ring->vma->node.flags); 69 ring->vma->node.size = sz; 70 71 intel_ring_update_space(ring); 72 73 return ring; 74 } 75 76 static void mock_ring_free(struct intel_ring *ring) 77 { 78 i915_active_fini(&ring->vma->active); 79 i915_vma_free(ring->vma); 80 81 kfree(ring); 82 } 83 84 static struct i915_request *first_request(struct mock_engine *engine) 85 { 86 return list_first_entry_or_null(&engine->hw_queue, 87 struct i915_request, 88 mock.link); 89 } 90 91 static void advance(struct i915_request *request) 92 { 93 list_del_init(&request->mock.link); 94 i915_request_mark_complete(request); 95 GEM_BUG_ON(!i915_request_completed(request)); 96 97 intel_engine_signal_breadcrumbs(request->engine); 98 } 99 100 static void hw_delay_complete(struct timer_list *t) 101 { 102 struct mock_engine *engine = from_timer(engine, t, hw_delay); 103 struct i915_request *request; 104 unsigned long flags; 105 106 spin_lock_irqsave(&engine->hw_lock, flags); 107 108 /* Timer fired, first request is complete */ 109 request = first_request(engine); 110 if (request) 111 advance(request); 112 113 /* 114 * Also immediately signal any subsequent 0-delay requests, but 115 * requeue the timer for the next delayed request. 116 */ 117 while ((request = first_request(engine))) { 118 if (request->mock.delay) { 119 mod_timer(&engine->hw_delay, 120 jiffies + request->mock.delay); 121 break; 122 } 123 124 advance(request); 125 } 126 127 spin_unlock_irqrestore(&engine->hw_lock, flags); 128 } 129 130 static void mock_context_unpin(struct intel_context *ce) 131 { 132 } 133 134 static void mock_context_destroy(struct kref *ref) 135 { 136 struct intel_context *ce = container_of(ref, typeof(*ce), ref); 137 138 GEM_BUG_ON(intel_context_is_pinned(ce)); 139 140 if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) { 141 mock_ring_free(ce->ring); 142 mock_timeline_unpin(ce->timeline); 143 } 144 145 intel_context_fini(ce); 146 intel_context_free(ce); 147 } 148 149 static int mock_context_alloc(struct intel_context *ce) 150 { 151 ce->ring = mock_ring(ce->engine); 152 if (!ce->ring) 153 return -ENOMEM; 154 155 GEM_BUG_ON(ce->timeline); 156 ce->timeline = intel_timeline_create(ce->engine->gt, NULL); 157 if (IS_ERR(ce->timeline)) { 158 kfree(ce->engine); 159 return PTR_ERR(ce->timeline); 160 } 161 162 mock_timeline_pin(ce->timeline); 163 164 return 0; 165 } 166 167 static int mock_context_pin(struct intel_context *ce) 168 { 169 return 0; 170 } 171 172 static void mock_context_reset(struct intel_context *ce) 173 { 174 } 175 176 static const struct intel_context_ops mock_context_ops = { 177 .alloc = mock_context_alloc, 178 179 .pin = mock_context_pin, 180 .unpin = mock_context_unpin, 181 182 .enter = intel_context_enter_engine, 183 .exit = intel_context_exit_engine, 184 185 .reset = mock_context_reset, 186 .destroy = mock_context_destroy, 187 }; 188 189 static int mock_request_alloc(struct i915_request *request) 190 { 191 INIT_LIST_HEAD(&request->mock.link); 192 request->mock.delay = 0; 193 194 return 0; 195 } 196 197 static int mock_emit_flush(struct i915_request *request, 198 unsigned int flags) 199 { 200 return 0; 201 } 202 203 static u32 *mock_emit_breadcrumb(struct i915_request *request, u32 *cs) 204 { 205 return cs; 206 } 207 208 static void mock_submit_request(struct i915_request *request) 209 { 210 struct mock_engine *engine = 211 container_of(request->engine, typeof(*engine), base); 212 unsigned long flags; 213 214 i915_request_submit(request); 215 216 spin_lock_irqsave(&engine->hw_lock, flags); 217 list_add_tail(&request->mock.link, &engine->hw_queue); 218 if (list_is_first(&request->mock.link, &engine->hw_queue)) { 219 if (request->mock.delay) 220 mod_timer(&engine->hw_delay, 221 jiffies + request->mock.delay); 222 else 223 advance(request); 224 } 225 spin_unlock_irqrestore(&engine->hw_lock, flags); 226 } 227 228 static void mock_reset_prepare(struct intel_engine_cs *engine) 229 { 230 } 231 232 static void mock_reset_rewind(struct intel_engine_cs *engine, bool stalled) 233 { 234 GEM_BUG_ON(stalled); 235 } 236 237 static void mock_reset_cancel(struct intel_engine_cs *engine) 238 { 239 struct i915_request *request; 240 unsigned long flags; 241 242 spin_lock_irqsave(&engine->active.lock, flags); 243 244 /* Mark all submitted requests as skipped. */ 245 list_for_each_entry(request, &engine->active.requests, sched.link) { 246 i915_request_set_error_once(request, -EIO); 247 i915_request_mark_complete(request); 248 } 249 250 spin_unlock_irqrestore(&engine->active.lock, flags); 251 } 252 253 static void mock_reset_finish(struct intel_engine_cs *engine) 254 { 255 } 256 257 static void mock_engine_release(struct intel_engine_cs *engine) 258 { 259 struct mock_engine *mock = 260 container_of(engine, typeof(*mock), base); 261 262 GEM_BUG_ON(timer_pending(&mock->hw_delay)); 263 264 intel_context_unpin(engine->kernel_context); 265 intel_context_put(engine->kernel_context); 266 267 intel_engine_fini_retire(engine); 268 intel_engine_fini_breadcrumbs(engine); 269 } 270 271 struct intel_engine_cs *mock_engine(struct drm_i915_private *i915, 272 const char *name, 273 int id) 274 { 275 struct mock_engine *engine; 276 277 GEM_BUG_ON(id >= I915_NUM_ENGINES); 278 GEM_BUG_ON(!i915->gt.uncore); 279 280 engine = kzalloc(sizeof(*engine) + PAGE_SIZE, GFP_KERNEL); 281 if (!engine) 282 return NULL; 283 284 /* minimal engine setup for requests */ 285 engine->base.i915 = i915; 286 engine->base.gt = &i915->gt; 287 engine->base.uncore = i915->gt.uncore; 288 snprintf(engine->base.name, sizeof(engine->base.name), "%s", name); 289 engine->base.id = id; 290 engine->base.mask = BIT(id); 291 engine->base.legacy_idx = INVALID_ENGINE; 292 engine->base.instance = id; 293 engine->base.status_page.addr = (void *)(engine + 1); 294 295 engine->base.cops = &mock_context_ops; 296 engine->base.request_alloc = mock_request_alloc; 297 engine->base.emit_flush = mock_emit_flush; 298 engine->base.emit_fini_breadcrumb = mock_emit_breadcrumb; 299 engine->base.submit_request = mock_submit_request; 300 301 engine->base.reset.prepare = mock_reset_prepare; 302 engine->base.reset.rewind = mock_reset_rewind; 303 engine->base.reset.cancel = mock_reset_cancel; 304 engine->base.reset.finish = mock_reset_finish; 305 306 engine->base.release = mock_engine_release; 307 308 i915->gt.engine[id] = &engine->base; 309 i915->gt.engine_class[0][id] = &engine->base; 310 311 /* fake hw queue */ 312 spin_lock_init(&engine->hw_lock); 313 timer_setup(&engine->hw_delay, hw_delay_complete, 0); 314 INIT_LIST_HEAD(&engine->hw_queue); 315 316 intel_engine_add_user(&engine->base); 317 318 return &engine->base; 319 } 320 321 int mock_engine_init(struct intel_engine_cs *engine) 322 { 323 struct intel_context *ce; 324 325 intel_engine_init_active(engine, ENGINE_MOCK); 326 intel_engine_init_breadcrumbs(engine); 327 intel_engine_init_execlists(engine); 328 intel_engine_init__pm(engine); 329 intel_engine_init_retire(engine); 330 331 ce = create_kernel_context(engine); 332 if (IS_ERR(ce)) 333 goto err_breadcrumbs; 334 335 engine->kernel_context = ce; 336 return 0; 337 338 err_breadcrumbs: 339 intel_engine_fini_breadcrumbs(engine); 340 return -ENOMEM; 341 } 342 343 void mock_engine_flush(struct intel_engine_cs *engine) 344 { 345 struct mock_engine *mock = 346 container_of(engine, typeof(*mock), base); 347 struct i915_request *request, *rn; 348 349 del_timer_sync(&mock->hw_delay); 350 351 spin_lock_irq(&mock->hw_lock); 352 list_for_each_entry_safe(request, rn, &mock->hw_queue, mock.link) 353 advance(request); 354 spin_unlock_irq(&mock->hw_lock); 355 } 356 357 void mock_engine_reset(struct intel_engine_cs *engine) 358 { 359 } 360