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 27 #include "i915_drv.h" 28 #include "intel_context.h" 29 #include "intel_engine_pm.h" 30 31 #include "mock_engine.h" 32 #include "selftests/mock_request.h" 33 34 struct mock_ring { 35 struct intel_ring base; 36 struct i915_timeline timeline; 37 }; 38 39 static void mock_timeline_pin(struct i915_timeline *tl) 40 { 41 tl->pin_count++; 42 } 43 44 static void mock_timeline_unpin(struct i915_timeline *tl) 45 { 46 GEM_BUG_ON(!tl->pin_count); 47 tl->pin_count--; 48 } 49 50 static struct intel_ring *mock_ring(struct intel_engine_cs *engine) 51 { 52 const unsigned long sz = PAGE_SIZE / 2; 53 struct mock_ring *ring; 54 55 ring = kzalloc(sizeof(*ring) + sz, GFP_KERNEL); 56 if (!ring) 57 return NULL; 58 59 if (i915_timeline_init(engine->i915, &ring->timeline, NULL)) { 60 kfree(ring); 61 return NULL; 62 } 63 64 kref_init(&ring->base.ref); 65 ring->base.size = sz; 66 ring->base.effective_size = sz; 67 ring->base.vaddr = (void *)(ring + 1); 68 ring->base.timeline = &ring->timeline; 69 atomic_set(&ring->base.pin_count, 1); 70 71 INIT_LIST_HEAD(&ring->base.request_list); 72 intel_ring_update_space(&ring->base); 73 74 return &ring->base; 75 } 76 77 static void mock_ring_free(struct intel_ring *base) 78 { 79 struct mock_ring *ring = container_of(base, typeof(*ring), base); 80 81 i915_timeline_fini(&ring->timeline); 82 kfree(ring); 83 } 84 85 static struct i915_request *first_request(struct mock_engine *engine) 86 { 87 return list_first_entry_or_null(&engine->hw_queue, 88 struct i915_request, 89 mock.link); 90 } 91 92 static void advance(struct i915_request *request) 93 { 94 list_del_init(&request->mock.link); 95 i915_request_mark_complete(request); 96 GEM_BUG_ON(!i915_request_completed(request)); 97 98 intel_engine_queue_breadcrumbs(request->engine); 99 } 100 101 static void hw_delay_complete(struct timer_list *t) 102 { 103 struct mock_engine *engine = from_timer(engine, t, hw_delay); 104 struct i915_request *request; 105 unsigned long flags; 106 107 spin_lock_irqsave(&engine->hw_lock, flags); 108 109 /* Timer fired, first request is complete */ 110 request = first_request(engine); 111 if (request) 112 advance(request); 113 114 /* 115 * Also immediately signal any subsequent 0-delay requests, but 116 * requeue the timer for the next delayed request. 117 */ 118 while ((request = first_request(engine))) { 119 if (request->mock.delay) { 120 mod_timer(&engine->hw_delay, 121 jiffies + request->mock.delay); 122 break; 123 } 124 125 advance(request); 126 } 127 128 spin_unlock_irqrestore(&engine->hw_lock, flags); 129 } 130 131 static void mock_context_unpin(struct intel_context *ce) 132 { 133 mock_timeline_unpin(ce->ring->timeline); 134 } 135 136 static void mock_context_destroy(struct kref *ref) 137 { 138 struct intel_context *ce = container_of(ref, typeof(*ce), ref); 139 140 GEM_BUG_ON(intel_context_is_pinned(ce)); 141 142 if (ce->ring) 143 mock_ring_free(ce->ring); 144 145 intel_context_free(ce); 146 } 147 148 static int mock_context_pin(struct intel_context *ce) 149 { 150 int ret; 151 152 if (!ce->ring) { 153 ce->ring = mock_ring(ce->engine); 154 if (!ce->ring) 155 return -ENOMEM; 156 } 157 158 ret = intel_context_active_acquire(ce, PIN_HIGH); 159 if (ret) 160 return ret; 161 162 mock_timeline_pin(ce->ring->timeline); 163 return 0; 164 } 165 166 static const struct intel_context_ops mock_context_ops = { 167 .pin = mock_context_pin, 168 .unpin = mock_context_unpin, 169 170 .enter = intel_context_enter_engine, 171 .exit = intel_context_exit_engine, 172 173 .destroy = mock_context_destroy, 174 }; 175 176 static int mock_request_alloc(struct i915_request *request) 177 { 178 INIT_LIST_HEAD(&request->mock.link); 179 request->mock.delay = 0; 180 181 return 0; 182 } 183 184 static int mock_emit_flush(struct i915_request *request, 185 unsigned int flags) 186 { 187 return 0; 188 } 189 190 static u32 *mock_emit_breadcrumb(struct i915_request *request, u32 *cs) 191 { 192 return cs; 193 } 194 195 static void mock_submit_request(struct i915_request *request) 196 { 197 struct mock_engine *engine = 198 container_of(request->engine, typeof(*engine), base); 199 unsigned long flags; 200 201 i915_request_submit(request); 202 203 spin_lock_irqsave(&engine->hw_lock, flags); 204 list_add_tail(&request->mock.link, &engine->hw_queue); 205 if (list_is_first(&request->mock.link, &engine->hw_queue)) { 206 if (request->mock.delay) 207 mod_timer(&engine->hw_delay, 208 jiffies + request->mock.delay); 209 else 210 advance(request); 211 } 212 spin_unlock_irqrestore(&engine->hw_lock, flags); 213 } 214 215 static void mock_reset_prepare(struct intel_engine_cs *engine) 216 { 217 } 218 219 static void mock_reset(struct intel_engine_cs *engine, bool stalled) 220 { 221 GEM_BUG_ON(stalled); 222 } 223 224 static void mock_reset_finish(struct intel_engine_cs *engine) 225 { 226 } 227 228 static void mock_cancel_requests(struct intel_engine_cs *engine) 229 { 230 struct i915_request *request; 231 unsigned long flags; 232 233 spin_lock_irqsave(&engine->active.lock, flags); 234 235 /* Mark all submitted requests as skipped. */ 236 list_for_each_entry(request, &engine->active.requests, sched.link) { 237 if (!i915_request_signaled(request)) 238 dma_fence_set_error(&request->fence, -EIO); 239 240 i915_request_mark_complete(request); 241 } 242 243 spin_unlock_irqrestore(&engine->active.lock, flags); 244 } 245 246 struct intel_engine_cs *mock_engine(struct drm_i915_private *i915, 247 const char *name, 248 int id) 249 { 250 struct mock_engine *engine; 251 252 GEM_BUG_ON(id >= I915_NUM_ENGINES); 253 254 engine = kzalloc(sizeof(*engine) + PAGE_SIZE, GFP_KERNEL); 255 if (!engine) 256 return NULL; 257 258 /* minimal engine setup for requests */ 259 engine->base.i915 = i915; 260 snprintf(engine->base.name, sizeof(engine->base.name), "%s", name); 261 engine->base.id = id; 262 engine->base.mask = BIT(id); 263 engine->base.status_page.addr = (void *)(engine + 1); 264 265 engine->base.cops = &mock_context_ops; 266 engine->base.request_alloc = mock_request_alloc; 267 engine->base.emit_flush = mock_emit_flush; 268 engine->base.emit_fini_breadcrumb = mock_emit_breadcrumb; 269 engine->base.submit_request = mock_submit_request; 270 271 engine->base.reset.prepare = mock_reset_prepare; 272 engine->base.reset.reset = mock_reset; 273 engine->base.reset.finish = mock_reset_finish; 274 engine->base.cancel_requests = mock_cancel_requests; 275 276 /* fake hw queue */ 277 spin_lock_init(&engine->hw_lock); 278 timer_setup(&engine->hw_delay, hw_delay_complete, 0); 279 INIT_LIST_HEAD(&engine->hw_queue); 280 281 return &engine->base; 282 } 283 284 int mock_engine_init(struct intel_engine_cs *engine) 285 { 286 struct drm_i915_private *i915 = engine->i915; 287 int err; 288 289 intel_engine_init_active(engine, ENGINE_MOCK); 290 intel_engine_init_breadcrumbs(engine); 291 intel_engine_init_execlists(engine); 292 intel_engine_init__pm(engine); 293 294 engine->kernel_context = 295 i915_gem_context_get_engine(i915->kernel_context, engine->id); 296 if (IS_ERR(engine->kernel_context)) 297 goto err_breadcrumbs; 298 299 err = intel_context_pin(engine->kernel_context); 300 intel_context_put(engine->kernel_context); 301 if (err) 302 goto err_breadcrumbs; 303 304 return 0; 305 306 err_breadcrumbs: 307 intel_engine_fini_breadcrumbs(engine); 308 return -ENOMEM; 309 } 310 311 void mock_engine_flush(struct intel_engine_cs *engine) 312 { 313 struct mock_engine *mock = 314 container_of(engine, typeof(*mock), base); 315 struct i915_request *request, *rn; 316 317 del_timer_sync(&mock->hw_delay); 318 319 spin_lock_irq(&mock->hw_lock); 320 list_for_each_entry_safe(request, rn, &mock->hw_queue, mock.link) 321 advance(request); 322 spin_unlock_irq(&mock->hw_lock); 323 } 324 325 void mock_engine_reset(struct intel_engine_cs *engine) 326 { 327 } 328 329 void mock_engine_free(struct intel_engine_cs *engine) 330 { 331 struct mock_engine *mock = 332 container_of(engine, typeof(*mock), base); 333 334 GEM_BUG_ON(timer_pending(&mock->hw_delay)); 335 336 intel_context_unpin(engine->kernel_context); 337 338 intel_engine_fini_breadcrumbs(engine); 339 340 kfree(engine); 341 } 342