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 "i915_drv.h" 26 #include "i915_gem_context.h" 27 #include "intel_context.h" 28 #include "intel_engine_pm.h" 29 30 #include "mock_engine.h" 31 #include "selftests/mock_request.h" 32 33 struct mock_ring { 34 struct intel_ring base; 35 struct i915_timeline timeline; 36 }; 37 38 static void mock_timeline_pin(struct i915_timeline *tl) 39 { 40 tl->pin_count++; 41 } 42 43 static void mock_timeline_unpin(struct i915_timeline *tl) 44 { 45 GEM_BUG_ON(!tl->pin_count); 46 tl->pin_count--; 47 } 48 49 static struct intel_ring *mock_ring(struct intel_engine_cs *engine) 50 { 51 const unsigned long sz = PAGE_SIZE / 2; 52 struct mock_ring *ring; 53 54 ring = kzalloc(sizeof(*ring) + sz, GFP_KERNEL); 55 if (!ring) 56 return NULL; 57 58 if (i915_timeline_init(engine->i915, &ring->timeline, NULL)) { 59 kfree(ring); 60 return NULL; 61 } 62 63 kref_init(&ring->base.ref); 64 ring->base.size = sz; 65 ring->base.effective_size = sz; 66 ring->base.vaddr = (void *)(ring + 1); 67 ring->base.timeline = &ring->timeline; 68 69 INIT_LIST_HEAD(&ring->base.request_list); 70 intel_ring_update_space(&ring->base); 71 72 return &ring->base; 73 } 74 75 static void mock_ring_free(struct intel_ring *base) 76 { 77 struct mock_ring *ring = container_of(base, typeof(*ring), base); 78 79 i915_timeline_fini(&ring->timeline); 80 kfree(ring); 81 } 82 83 static struct i915_request *first_request(struct mock_engine *engine) 84 { 85 return list_first_entry_or_null(&engine->hw_queue, 86 struct i915_request, 87 mock.link); 88 } 89 90 static void advance(struct i915_request *request) 91 { 92 list_del_init(&request->mock.link); 93 i915_request_mark_complete(request); 94 GEM_BUG_ON(!i915_request_completed(request)); 95 96 intel_engine_queue_breadcrumbs(request->engine); 97 } 98 99 static void hw_delay_complete(struct timer_list *t) 100 { 101 struct mock_engine *engine = from_timer(engine, t, hw_delay); 102 struct i915_request *request; 103 unsigned long flags; 104 105 spin_lock_irqsave(&engine->hw_lock, flags); 106 107 /* Timer fired, first request is complete */ 108 request = first_request(engine); 109 if (request) 110 advance(request); 111 112 /* 113 * Also immediately signal any subsequent 0-delay requests, but 114 * requeue the timer for the next delayed request. 115 */ 116 while ((request = first_request(engine))) { 117 if (request->mock.delay) { 118 mod_timer(&engine->hw_delay, 119 jiffies + request->mock.delay); 120 break; 121 } 122 123 advance(request); 124 } 125 126 spin_unlock_irqrestore(&engine->hw_lock, flags); 127 } 128 129 static void mock_context_unpin(struct intel_context *ce) 130 { 131 mock_timeline_unpin(ce->ring->timeline); 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 (ce->ring) 141 mock_ring_free(ce->ring); 142 143 intel_context_free(ce); 144 } 145 146 static int mock_context_pin(struct intel_context *ce) 147 { 148 if (!ce->ring) { 149 ce->ring = mock_ring(ce->engine); 150 if (!ce->ring) 151 return -ENOMEM; 152 } 153 154 mock_timeline_pin(ce->ring->timeline); 155 return 0; 156 } 157 158 static const struct intel_context_ops mock_context_ops = { 159 .pin = mock_context_pin, 160 .unpin = mock_context_unpin, 161 162 .enter = intel_context_enter_engine, 163 .exit = intel_context_exit_engine, 164 165 .destroy = mock_context_destroy, 166 }; 167 168 static int mock_request_alloc(struct i915_request *request) 169 { 170 INIT_LIST_HEAD(&request->mock.link); 171 request->mock.delay = 0; 172 173 return 0; 174 } 175 176 static int mock_emit_flush(struct i915_request *request, 177 unsigned int flags) 178 { 179 return 0; 180 } 181 182 static u32 *mock_emit_breadcrumb(struct i915_request *request, u32 *cs) 183 { 184 return cs; 185 } 186 187 static void mock_submit_request(struct i915_request *request) 188 { 189 struct mock_engine *engine = 190 container_of(request->engine, typeof(*engine), base); 191 unsigned long flags; 192 193 i915_request_submit(request); 194 195 spin_lock_irqsave(&engine->hw_lock, flags); 196 list_add_tail(&request->mock.link, &engine->hw_queue); 197 if (list_is_first(&request->mock.link, &engine->hw_queue)) { 198 if (request->mock.delay) 199 mod_timer(&engine->hw_delay, 200 jiffies + request->mock.delay); 201 else 202 advance(request); 203 } 204 spin_unlock_irqrestore(&engine->hw_lock, flags); 205 } 206 207 static void mock_reset_prepare(struct intel_engine_cs *engine) 208 { 209 } 210 211 static void mock_reset(struct intel_engine_cs *engine, bool stalled) 212 { 213 GEM_BUG_ON(stalled); 214 } 215 216 static void mock_reset_finish(struct intel_engine_cs *engine) 217 { 218 } 219 220 static void mock_cancel_requests(struct intel_engine_cs *engine) 221 { 222 struct i915_request *request; 223 unsigned long flags; 224 225 spin_lock_irqsave(&engine->timeline.lock, flags); 226 227 /* Mark all submitted requests as skipped. */ 228 list_for_each_entry(request, &engine->timeline.requests, sched.link) { 229 if (!i915_request_signaled(request)) 230 dma_fence_set_error(&request->fence, -EIO); 231 232 i915_request_mark_complete(request); 233 } 234 235 spin_unlock_irqrestore(&engine->timeline.lock, flags); 236 } 237 238 struct intel_engine_cs *mock_engine(struct drm_i915_private *i915, 239 const char *name, 240 int id) 241 { 242 struct mock_engine *engine; 243 244 GEM_BUG_ON(id >= I915_NUM_ENGINES); 245 246 engine = kzalloc(sizeof(*engine) + PAGE_SIZE, GFP_KERNEL); 247 if (!engine) 248 return NULL; 249 250 /* minimal engine setup for requests */ 251 engine->base.i915 = i915; 252 snprintf(engine->base.name, sizeof(engine->base.name), "%s", name); 253 engine->base.id = id; 254 engine->base.mask = BIT(id); 255 engine->base.status_page.addr = (void *)(engine + 1); 256 257 engine->base.cops = &mock_context_ops; 258 engine->base.request_alloc = mock_request_alloc; 259 engine->base.emit_flush = mock_emit_flush; 260 engine->base.emit_fini_breadcrumb = mock_emit_breadcrumb; 261 engine->base.submit_request = mock_submit_request; 262 263 engine->base.reset.prepare = mock_reset_prepare; 264 engine->base.reset.reset = mock_reset; 265 engine->base.reset.finish = mock_reset_finish; 266 engine->base.cancel_requests = mock_cancel_requests; 267 268 /* fake hw queue */ 269 spin_lock_init(&engine->hw_lock); 270 timer_setup(&engine->hw_delay, hw_delay_complete, 0); 271 INIT_LIST_HEAD(&engine->hw_queue); 272 273 return &engine->base; 274 } 275 276 int mock_engine_init(struct intel_engine_cs *engine) 277 { 278 struct drm_i915_private *i915 = engine->i915; 279 int err; 280 281 intel_engine_init_breadcrumbs(engine); 282 intel_engine_init_execlists(engine); 283 intel_engine_init__pm(engine); 284 285 if (i915_timeline_init(i915, &engine->timeline, NULL)) 286 goto err_breadcrumbs; 287 i915_timeline_set_subclass(&engine->timeline, TIMELINE_ENGINE); 288 289 engine->kernel_context = 290 i915_gem_context_get_engine(i915->kernel_context, engine->id); 291 if (IS_ERR(engine->kernel_context)) 292 goto err_timeline; 293 294 err = intel_context_pin(engine->kernel_context); 295 intel_context_put(engine->kernel_context); 296 if (err) 297 goto err_timeline; 298 299 return 0; 300 301 err_timeline: 302 i915_timeline_fini(&engine->timeline); 303 err_breadcrumbs: 304 intel_engine_fini_breadcrumbs(engine); 305 return -ENOMEM; 306 } 307 308 void mock_engine_flush(struct intel_engine_cs *engine) 309 { 310 struct mock_engine *mock = 311 container_of(engine, typeof(*mock), base); 312 struct i915_request *request, *rn; 313 314 del_timer_sync(&mock->hw_delay); 315 316 spin_lock_irq(&mock->hw_lock); 317 list_for_each_entry_safe(request, rn, &mock->hw_queue, mock.link) 318 advance(request); 319 spin_unlock_irq(&mock->hw_lock); 320 } 321 322 void mock_engine_reset(struct intel_engine_cs *engine) 323 { 324 } 325 326 void mock_engine_free(struct intel_engine_cs *engine) 327 { 328 struct mock_engine *mock = 329 container_of(engine, typeof(*mock), base); 330 struct intel_context *ce; 331 332 GEM_BUG_ON(timer_pending(&mock->hw_delay)); 333 334 ce = fetch_and_zero(&engine->last_retired_context); 335 if (ce) 336 intel_context_unpin(ce); 337 338 intel_context_unpin(engine->kernel_context); 339 340 intel_engine_fini_breadcrumbs(engine); 341 i915_timeline_fini(&engine->timeline); 342 343 kfree(engine); 344 } 345