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 intel_context_active_acquire(ce); 153 } 154 155 static const struct intel_context_ops mock_context_ops = { 156 .alloc = mock_context_alloc, 157 158 .pin = mock_context_pin, 159 .unpin = mock_context_unpin, 160 161 .enter = intel_context_enter_engine, 162 .exit = intel_context_exit_engine, 163 164 .destroy = mock_context_destroy, 165 }; 166 167 static int mock_request_alloc(struct i915_request *request) 168 { 169 INIT_LIST_HEAD(&request->mock.link); 170 request->mock.delay = 0; 171 172 return 0; 173 } 174 175 static int mock_emit_flush(struct i915_request *request, 176 unsigned int flags) 177 { 178 return 0; 179 } 180 181 static u32 *mock_emit_breadcrumb(struct i915_request *request, u32 *cs) 182 { 183 return cs; 184 } 185 186 static void mock_submit_request(struct i915_request *request) 187 { 188 struct mock_engine *engine = 189 container_of(request->engine, typeof(*engine), base); 190 unsigned long flags; 191 192 i915_request_submit(request); 193 194 spin_lock_irqsave(&engine->hw_lock, flags); 195 list_add_tail(&request->mock.link, &engine->hw_queue); 196 if (list_is_first(&request->mock.link, &engine->hw_queue)) { 197 if (request->mock.delay) 198 mod_timer(&engine->hw_delay, 199 jiffies + request->mock.delay); 200 else 201 advance(request); 202 } 203 spin_unlock_irqrestore(&engine->hw_lock, flags); 204 } 205 206 static void mock_reset_prepare(struct intel_engine_cs *engine) 207 { 208 } 209 210 static void mock_reset_rewind(struct intel_engine_cs *engine, bool stalled) 211 { 212 GEM_BUG_ON(stalled); 213 } 214 215 static void mock_reset_cancel(struct intel_engine_cs *engine) 216 { 217 struct i915_request *request; 218 unsigned long flags; 219 220 spin_lock_irqsave(&engine->active.lock, flags); 221 222 /* Mark all submitted requests as skipped. */ 223 list_for_each_entry(request, &engine->active.requests, sched.link) { 224 if (!i915_request_signaled(request)) 225 dma_fence_set_error(&request->fence, -EIO); 226 227 i915_request_mark_complete(request); 228 } 229 230 spin_unlock_irqrestore(&engine->active.lock, flags); 231 } 232 233 static void mock_reset_finish(struct intel_engine_cs *engine) 234 { 235 } 236 237 static void mock_engine_release(struct intel_engine_cs *engine) 238 { 239 struct mock_engine *mock = 240 container_of(engine, typeof(*mock), base); 241 242 GEM_BUG_ON(timer_pending(&mock->hw_delay)); 243 244 intel_context_unpin(engine->kernel_context); 245 intel_context_put(engine->kernel_context); 246 247 intel_engine_fini_retire(engine); 248 intel_engine_fini_breadcrumbs(engine); 249 } 250 251 struct intel_engine_cs *mock_engine(struct drm_i915_private *i915, 252 const char *name, 253 int id) 254 { 255 struct mock_engine *engine; 256 257 GEM_BUG_ON(id >= I915_NUM_ENGINES); 258 GEM_BUG_ON(!i915->gt.uncore); 259 260 engine = kzalloc(sizeof(*engine) + PAGE_SIZE, GFP_KERNEL); 261 if (!engine) 262 return NULL; 263 264 /* minimal engine setup for requests */ 265 engine->base.i915 = i915; 266 engine->base.gt = &i915->gt; 267 engine->base.uncore = i915->gt.uncore; 268 snprintf(engine->base.name, sizeof(engine->base.name), "%s", name); 269 engine->base.id = id; 270 engine->base.mask = BIT(id); 271 engine->base.legacy_idx = INVALID_ENGINE; 272 engine->base.instance = id; 273 engine->base.status_page.addr = (void *)(engine + 1); 274 275 engine->base.cops = &mock_context_ops; 276 engine->base.request_alloc = mock_request_alloc; 277 engine->base.emit_flush = mock_emit_flush; 278 engine->base.emit_fini_breadcrumb = mock_emit_breadcrumb; 279 engine->base.submit_request = mock_submit_request; 280 281 engine->base.reset.prepare = mock_reset_prepare; 282 engine->base.reset.rewind = mock_reset_rewind; 283 engine->base.reset.cancel = mock_reset_cancel; 284 engine->base.reset.finish = mock_reset_finish; 285 286 engine->base.release = mock_engine_release; 287 288 i915->gt.engine[id] = &engine->base; 289 i915->gt.engine_class[0][id] = &engine->base; 290 291 /* fake hw queue */ 292 spin_lock_init(&engine->hw_lock); 293 timer_setup(&engine->hw_delay, hw_delay_complete, 0); 294 INIT_LIST_HEAD(&engine->hw_queue); 295 296 intel_engine_add_user(&engine->base); 297 298 return &engine->base; 299 } 300 301 int mock_engine_init(struct intel_engine_cs *engine) 302 { 303 struct intel_context *ce; 304 305 intel_engine_init_active(engine, ENGINE_MOCK); 306 intel_engine_init_breadcrumbs(engine); 307 intel_engine_init_execlists(engine); 308 intel_engine_init__pm(engine); 309 intel_engine_init_retire(engine); 310 intel_engine_pool_init(&engine->pool); 311 312 ce = create_kernel_context(engine); 313 if (IS_ERR(ce)) 314 goto err_breadcrumbs; 315 316 engine->kernel_context = ce; 317 return 0; 318 319 err_breadcrumbs: 320 intel_engine_fini_breadcrumbs(engine); 321 return -ENOMEM; 322 } 323 324 void mock_engine_flush(struct intel_engine_cs *engine) 325 { 326 struct mock_engine *mock = 327 container_of(engine, typeof(*mock), base); 328 struct i915_request *request, *rn; 329 330 del_timer_sync(&mock->hw_delay); 331 332 spin_lock_irq(&mock->hw_lock); 333 list_for_each_entry_safe(request, rn, &mock->hw_queue, mock.link) 334 advance(request); 335 spin_unlock_irq(&mock->hw_lock); 336 } 337 338 void mock_engine_reset(struct intel_engine_cs *engine) 339 { 340 } 341