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_queue_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(struct intel_engine_cs *engine, bool stalled) 211 { 212 GEM_BUG_ON(stalled); 213 } 214 215 static void mock_reset_finish(struct intel_engine_cs *engine) 216 { 217 } 218 219 static void mock_cancel_requests(struct intel_engine_cs *engine) 220 { 221 struct i915_request *request; 222 unsigned long flags; 223 224 spin_lock_irqsave(&engine->active.lock, flags); 225 226 /* Mark all submitted requests as skipped. */ 227 list_for_each_entry(request, &engine->active.requests, sched.link) { 228 if (!i915_request_signaled(request)) 229 dma_fence_set_error(&request->fence, -EIO); 230 231 i915_request_mark_complete(request); 232 } 233 234 spin_unlock_irqrestore(&engine->active.lock, flags); 235 } 236 237 struct intel_engine_cs *mock_engine(struct drm_i915_private *i915, 238 const char *name, 239 int id) 240 { 241 struct mock_engine *engine; 242 243 GEM_BUG_ON(id >= I915_NUM_ENGINES); 244 GEM_BUG_ON(!i915->gt.uncore); 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 engine->base.gt = &i915->gt; 253 engine->base.uncore = i915->gt.uncore; 254 snprintf(engine->base.name, sizeof(engine->base.name), "%s", name); 255 engine->base.id = id; 256 engine->base.mask = BIT(id); 257 engine->base.legacy_idx = INVALID_ENGINE; 258 engine->base.instance = id; 259 engine->base.status_page.addr = (void *)(engine + 1); 260 261 engine->base.cops = &mock_context_ops; 262 engine->base.request_alloc = mock_request_alloc; 263 engine->base.emit_flush = mock_emit_flush; 264 engine->base.emit_fini_breadcrumb = mock_emit_breadcrumb; 265 engine->base.submit_request = mock_submit_request; 266 267 engine->base.reset.prepare = mock_reset_prepare; 268 engine->base.reset.reset = mock_reset; 269 engine->base.reset.finish = mock_reset_finish; 270 engine->base.cancel_requests = mock_cancel_requests; 271 272 i915->gt.engine[id] = &engine->base; 273 i915->gt.engine_class[0][id] = &engine->base; 274 275 /* fake hw queue */ 276 spin_lock_init(&engine->hw_lock); 277 timer_setup(&engine->hw_delay, hw_delay_complete, 0); 278 INIT_LIST_HEAD(&engine->hw_queue); 279 280 intel_engine_add_user(&engine->base); 281 282 return &engine->base; 283 } 284 285 int mock_engine_init(struct intel_engine_cs *engine) 286 { 287 struct intel_context *ce; 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 intel_engine_pool_init(&engine->pool); 294 295 ce = create_kernel_context(engine); 296 if (IS_ERR(ce)) 297 goto err_breadcrumbs; 298 299 engine->kernel_context = ce; 300 return 0; 301 302 err_breadcrumbs: 303 intel_engine_fini_breadcrumbs(engine); 304 return -ENOMEM; 305 } 306 307 void mock_engine_flush(struct intel_engine_cs *engine) 308 { 309 struct mock_engine *mock = 310 container_of(engine, typeof(*mock), base); 311 struct i915_request *request, *rn; 312 313 del_timer_sync(&mock->hw_delay); 314 315 spin_lock_irq(&mock->hw_lock); 316 list_for_each_entry_safe(request, rn, &mock->hw_queue, mock.link) 317 advance(request); 318 spin_unlock_irq(&mock->hw_lock); 319 } 320 321 void mock_engine_reset(struct intel_engine_cs *engine) 322 { 323 } 324 325 void mock_engine_free(struct intel_engine_cs *engine) 326 { 327 struct mock_engine *mock = 328 container_of(engine, typeof(*mock), base); 329 330 GEM_BUG_ON(timer_pending(&mock->hw_delay)); 331 332 intel_context_unpin(engine->kernel_context); 333 intel_context_put(engine->kernel_context); 334 335 intel_engine_fini_breadcrumbs(engine); 336 337 kfree(engine); 338 } 339