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