root/drivers/gpu/drm/i915/gt/mock_engine.c

DEFINITIONS

1. mock_timeline_pin
2. mock_timeline_unpin
3. mock_ring
4. first_request
5. advance
6. hw_delay_complete
7. mock_context_unpin
8. mock_context_destroy
9. mock_context_alloc
10. mock_context_pin
11. mock_request_alloc
12. mock_emit_flush
13. mock_emit_breadcrumb
14. mock_submit_request
15. mock_reset_prepare
16. mock_reset
17. mock_reset_finish
18. mock_cancel_requests
19. mock_engine
20. mock_engine_init
21. mock_engine_flush
22. mock_engine_reset
23. mock_engine_free

   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 }