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 #include "intel_engine_pool.h" 32 33 #include "mock_engine.h" 34 #include "selftests/mock_request.h" 35 36 static void mock_timeline_pin(struct intel_timeline *tl) 37 { 38 atomic_inc(&tl->pin_count); 39 } 40 41 static void mock_timeline_unpin(struct intel_timeline *tl) 42 { 43 GEM_BUG_ON(!atomic_read(&tl->pin_count)); 44 atomic_dec(&tl->pin_count); 45 } 46 47 static struct intel_ring *mock_ring(struct intel_engine_cs *engine) 48 { 49 const unsigned long sz = PAGE_SIZE / 2; 50 struct intel_ring *ring; 51 52 ring = kzalloc(sizeof(*ring) + sz, GFP_KERNEL); 53 if (!ring) 54 return NULL; 55 56 kref_init(&ring->ref); 57 ring->size = sz; 58 ring->effective_size = sz; 59 ring->vaddr = (void *)(ring + 1); 60 atomic_set(&ring->pin_count, 1); 61 62 intel_ring_update_space(ring); 63 64 return ring; 65 } 66 67 static struct i915_request *first_request(struct mock_engine *engine) 68 { 69 return list_first_entry_or_null(&engine->hw_queue, 70 struct i915_request, 71 mock.link); 72 } 73 74 static void advance(struct i915_request *request) 75 { 76 list_del_init(&request->mock.link); 77 i915_request_mark_complete(request); 78 GEM_BUG_ON(!i915_request_completed(request)); 79 80 intel_engine_signal_breadcrumbs(request->engine); 81 } 82 83 static void hw_delay_complete(struct timer_list *t) 84 { 85 struct mock_engine *engine = from_timer(engine, t, hw_delay); 86 struct i915_request *request; 87 unsigned long flags; 88 89 spin_lock_irqsave(&engine->hw_lock, flags); 90 91 /* Timer fired, first request is complete */ 92 request = first_request(engine); 93 if (request) 94 advance(request); 95 96 /* 97 * Also immediately signal any subsequent 0-delay requests, but 98 * requeue the timer for the next delayed request. 99 */ 100 while ((request = first_request(engine))) { 101 if (request->mock.delay) { 102 mod_timer(&engine->hw_delay, 103 jiffies + request->mock.delay); 104 break; 105 } 106 107 advance(request); 108 } 109 110 spin_unlock_irqrestore(&engine->hw_lock, flags); 111 } 112 113 static void mock_context_unpin(struct intel_context *ce) 114 { 115 } 116 117 static void mock_context_destroy(struct kref *ref) 118 { 119 struct intel_context *ce = container_of(ref, typeof(*ce), ref); 120 121 GEM_BUG_ON(intel_context_is_pinned(ce)); 122 123 if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) { 124 kfree(ce->ring); 125 mock_timeline_unpin(ce->timeline); 126 } 127 128 intel_context_fini(ce); 129 intel_context_free(ce); 130 } 131 132 static int mock_context_alloc(struct intel_context *ce) 133 { 134 ce->ring = mock_ring(ce->engine); 135 if (!ce->ring) 136 return -ENOMEM; 137 138 GEM_BUG_ON(ce->timeline); 139 ce->timeline = intel_timeline_create(ce->engine->gt, NULL); 140 if (IS_ERR(ce->timeline)) { 141 kfree(ce->engine); 142 return PTR_ERR(ce->timeline); 143 } 144 145 mock_timeline_pin(ce->timeline); 146 147 return 0; 148 } 149 150 static int mock_context_pin(struct intel_context *ce) 151 { 152 return 0; 153 } 154 155 static void mock_context_reset(struct intel_context *ce) 156 { 157 } 158 159 static const struct intel_context_ops mock_context_ops = { 160 .alloc = mock_context_alloc, 161 162 .pin = mock_context_pin, 163 .unpin = mock_context_unpin, 164 165 .enter = intel_context_enter_engine, 166 .exit = intel_context_exit_engine, 167 168 .reset = mock_context_reset, 169 .destroy = mock_context_destroy, 170 }; 171 172 static int mock_request_alloc(struct i915_request *request) 173 { 174 INIT_LIST_HEAD(&request->mock.link); 175 request->mock.delay = 0; 176 177 return 0; 178 } 179 180 static int mock_emit_flush(struct i915_request *request, 181 unsigned int flags) 182 { 183 return 0; 184 } 185 186 static u32 *mock_emit_breadcrumb(struct i915_request *request, u32 *cs) 187 { 188 return cs; 189 } 190 191 static void mock_submit_request(struct i915_request *request) 192 { 193 struct mock_engine *engine = 194 container_of(request->engine, typeof(*engine), base); 195 unsigned long flags; 196 197 i915_request_submit(request); 198 199 spin_lock_irqsave(&engine->hw_lock, flags); 200 list_add_tail(&request->mock.link, &engine->hw_queue); 201 if (list_is_first(&request->mock.link, &engine->hw_queue)) { 202 if (request->mock.delay) 203 mod_timer(&engine->hw_delay, 204 jiffies + request->mock.delay); 205 else 206 advance(request); 207 } 208 spin_unlock_irqrestore(&engine->hw_lock, flags); 209 } 210 211 static void mock_reset_prepare(struct intel_engine_cs *engine) 212 { 213 } 214 215 static void mock_reset_rewind(struct intel_engine_cs *engine, bool stalled) 216 { 217 GEM_BUG_ON(stalled); 218 } 219 220 static void mock_reset_cancel(struct intel_engine_cs *engine) 221 { 222 struct i915_request *request; 223 unsigned long flags; 224 225 spin_lock_irqsave(&engine->active.lock, flags); 226 227 /* Mark all submitted requests as skipped. */ 228 list_for_each_entry(request, &engine->active.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->active.lock, flags); 236 } 237 238 static void mock_reset_finish(struct intel_engine_cs *engine) 239 { 240 } 241 242 static void mock_engine_release(struct intel_engine_cs *engine) 243 { 244 struct mock_engine *mock = 245 container_of(engine, typeof(*mock), base); 246 247 GEM_BUG_ON(timer_pending(&mock->hw_delay)); 248 249 intel_context_unpin(engine->kernel_context); 250 intel_context_put(engine->kernel_context); 251 252 intel_engine_fini_retire(engine); 253 intel_engine_fini_breadcrumbs(engine); 254 } 255 256 struct intel_engine_cs *mock_engine(struct drm_i915_private *i915, 257 const char *name, 258 int id) 259 { 260 struct mock_engine *engine; 261 262 GEM_BUG_ON(id >= I915_NUM_ENGINES); 263 GEM_BUG_ON(!i915->gt.uncore); 264 265 engine = kzalloc(sizeof(*engine) + PAGE_SIZE, GFP_KERNEL); 266 if (!engine) 267 return NULL; 268 269 /* minimal engine setup for requests */ 270 engine->base.i915 = i915; 271 engine->base.gt = &i915->gt; 272 engine->base.uncore = i915->gt.uncore; 273 snprintf(engine->base.name, sizeof(engine->base.name), "%s", name); 274 engine->base.id = id; 275 engine->base.mask = BIT(id); 276 engine->base.legacy_idx = INVALID_ENGINE; 277 engine->base.instance = id; 278 engine->base.status_page.addr = (void *)(engine + 1); 279 280 engine->base.cops = &mock_context_ops; 281 engine->base.request_alloc = mock_request_alloc; 282 engine->base.emit_flush = mock_emit_flush; 283 engine->base.emit_fini_breadcrumb = mock_emit_breadcrumb; 284 engine->base.submit_request = mock_submit_request; 285 286 engine->base.reset.prepare = mock_reset_prepare; 287 engine->base.reset.rewind = mock_reset_rewind; 288 engine->base.reset.cancel = mock_reset_cancel; 289 engine->base.reset.finish = mock_reset_finish; 290 291 engine->base.release = mock_engine_release; 292 293 i915->gt.engine[id] = &engine->base; 294 i915->gt.engine_class[0][id] = &engine->base; 295 296 /* fake hw queue */ 297 spin_lock_init(&engine->hw_lock); 298 timer_setup(&engine->hw_delay, hw_delay_complete, 0); 299 INIT_LIST_HEAD(&engine->hw_queue); 300 301 intel_engine_add_user(&engine->base); 302 303 return &engine->base; 304 } 305 306 int mock_engine_init(struct intel_engine_cs *engine) 307 { 308 struct intel_context *ce; 309 310 intel_engine_init_active(engine, ENGINE_MOCK); 311 intel_engine_init_breadcrumbs(engine); 312 intel_engine_init_execlists(engine); 313 intel_engine_init__pm(engine); 314 intel_engine_init_retire(engine); 315 intel_engine_pool_init(&engine->pool); 316 317 ce = create_kernel_context(engine); 318 if (IS_ERR(ce)) 319 goto err_breadcrumbs; 320 321 engine->kernel_context = ce; 322 return 0; 323 324 err_breadcrumbs: 325 intel_engine_fini_breadcrumbs(engine); 326 return -ENOMEM; 327 } 328 329 void mock_engine_flush(struct intel_engine_cs *engine) 330 { 331 struct mock_engine *mock = 332 container_of(engine, typeof(*mock), base); 333 struct i915_request *request, *rn; 334 335 del_timer_sync(&mock->hw_delay); 336 337 spin_lock_irq(&mock->hw_lock); 338 list_for_each_entry_safe(request, rn, &mock->hw_queue, mock.link) 339 advance(request); 340 spin_unlock_irq(&mock->hw_lock); 341 } 342 343 void mock_engine_reset(struct intel_engine_cs *engine) 344 { 345 } 346