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1// SPDX-License-Identifier: MIT2/*3 * Copyright © 2016 Intel Corporation4 */5 6#include "gem/i915_gem_context.h"7#include "gt/intel_ring.h"8 9#include "i915_drv.h"10#include "intel_context.h"11#include "intel_engine_pm.h"12 13#include "mock_engine.h"14#include "selftests/mock_request.h"15 16static int mock_timeline_pin(struct intel_timeline *tl)17{18 int err;19 20 if (WARN_ON(!i915_gem_object_trylock(tl->hwsp_ggtt->obj, NULL)))21 return -EBUSY;22 23 err = intel_timeline_pin_map(tl);24 i915_gem_object_unlock(tl->hwsp_ggtt->obj);25 if (err)26 return err;27 28 atomic_inc(&tl->pin_count);29 return 0;30}31 32static void mock_timeline_unpin(struct intel_timeline *tl)33{34 GEM_BUG_ON(!atomic_read(&tl->pin_count));35 atomic_dec(&tl->pin_count);36}37 38static struct i915_vma *create_ring_vma(struct i915_ggtt *ggtt, int size)39{40 struct i915_address_space *vm = &ggtt->vm;41 struct drm_i915_private *i915 = vm->i915;42 struct drm_i915_gem_object *obj;43 struct i915_vma *vma;44 45 obj = i915_gem_object_create_internal(i915, size);46 if (IS_ERR(obj))47 return ERR_CAST(obj);48 49 vma = i915_vma_instance(obj, vm, NULL);50 if (IS_ERR(vma))51 goto err;52 53 return vma;54 55err:56 i915_gem_object_put(obj);57 return vma;58}59 60static struct intel_ring *mock_ring(struct intel_engine_cs *engine)61{62 const unsigned long sz = PAGE_SIZE;63 struct intel_ring *ring;64 65 ring = kzalloc(sizeof(*ring) + sz, GFP_KERNEL);66 if (!ring)67 return NULL;68 69 kref_init(&ring->ref);70 ring->size = sz;71 ring->effective_size = sz;72 ring->vaddr = (void *)(ring + 1);73 atomic_set(&ring->pin_count, 1);74 75 ring->vma = create_ring_vma(engine->gt->ggtt, PAGE_SIZE);76 if (IS_ERR(ring->vma)) {77 kfree(ring);78 return NULL;79 }80 81 intel_ring_update_space(ring);82 83 return ring;84}85 86static void mock_ring_free(struct intel_ring *ring)87{88 i915_vma_put(ring->vma);89 90 kfree(ring);91}92 93static struct i915_request *first_request(struct mock_engine *engine)94{95 return list_first_entry_or_null(&engine->hw_queue,96 struct i915_request,97 mock.link);98}99 100static void advance(struct i915_request *request)101{102 list_del_init(&request->mock.link);103 i915_request_mark_complete(request);104 GEM_BUG_ON(!i915_request_completed(request));105 106 intel_engine_signal_breadcrumbs(request->engine);107}108 109static void hw_delay_complete(struct timer_list *t)110{111 struct mock_engine *engine = from_timer(engine, t, hw_delay);112 struct i915_request *request;113 unsigned long flags;114 115 spin_lock_irqsave(&engine->hw_lock, flags);116 117 /* Timer fired, first request is complete */118 request = first_request(engine);119 if (request)120 advance(request);121 122 /*123 * Also immediately signal any subsequent 0-delay requests, but124 * requeue the timer for the next delayed request.125 */126 while ((request = first_request(engine))) {127 if (request->mock.delay) {128 mod_timer(&engine->hw_delay,129 jiffies + request->mock.delay);130 break;131 }132 133 advance(request);134 }135 136 spin_unlock_irqrestore(&engine->hw_lock, flags);137}138 139static void mock_context_unpin(struct intel_context *ce)140{141}142 143static void mock_context_post_unpin(struct intel_context *ce)144{145 i915_vma_unpin(ce->ring->vma);146}147 148static void mock_context_destroy(struct kref *ref)149{150 struct intel_context *ce = container_of(ref, typeof(*ce), ref);151 152 GEM_BUG_ON(intel_context_is_pinned(ce));153 154 if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) {155 mock_ring_free(ce->ring);156 mock_timeline_unpin(ce->timeline);157 }158 159 intel_context_fini(ce);160 intel_context_free(ce);161}162 163static int mock_context_alloc(struct intel_context *ce)164{165 int err;166 167 ce->ring = mock_ring(ce->engine);168 if (!ce->ring)169 return -ENOMEM;170 171 ce->timeline = intel_timeline_create(ce->engine->gt);172 if (IS_ERR(ce->timeline)) {173 kfree(ce->engine);174 return PTR_ERR(ce->timeline);175 }176 177 err = mock_timeline_pin(ce->timeline);178 if (err) {179 intel_timeline_put(ce->timeline);180 ce->timeline = NULL;181 return err;182 }183 184 return 0;185}186 187static int mock_context_pre_pin(struct intel_context *ce,188 struct i915_gem_ww_ctx *ww, void **unused)189{190 return i915_vma_pin_ww(ce->ring->vma, ww, 0, 0, PIN_GLOBAL | PIN_HIGH);191}192 193static int mock_context_pin(struct intel_context *ce, void *unused)194{195 return 0;196}197 198static void mock_context_reset(struct intel_context *ce)199{200}201 202static const struct intel_context_ops mock_context_ops = {203 .alloc = mock_context_alloc,204 205 .pre_pin = mock_context_pre_pin,206 .pin = mock_context_pin,207 .unpin = mock_context_unpin,208 .post_unpin = mock_context_post_unpin,209 210 .enter = intel_context_enter_engine,211 .exit = intel_context_exit_engine,212 213 .reset = mock_context_reset,214 .destroy = mock_context_destroy,215};216 217static int mock_request_alloc(struct i915_request *request)218{219 INIT_LIST_HEAD(&request->mock.link);220 request->mock.delay = 0;221 222 return 0;223}224 225static int mock_emit_flush(struct i915_request *request,226 unsigned int flags)227{228 return 0;229}230 231static u32 *mock_emit_breadcrumb(struct i915_request *request, u32 *cs)232{233 return cs;234}235 236static void mock_submit_request(struct i915_request *request)237{238 struct mock_engine *engine =239 container_of(request->engine, typeof(*engine), base);240 unsigned long flags;241 242 i915_request_submit(request);243 244 spin_lock_irqsave(&engine->hw_lock, flags);245 list_add_tail(&request->mock.link, &engine->hw_queue);246 if (list_is_first(&request->mock.link, &engine->hw_queue)) {247 if (request->mock.delay)248 mod_timer(&engine->hw_delay,249 jiffies + request->mock.delay);250 else251 advance(request);252 }253 spin_unlock_irqrestore(&engine->hw_lock, flags);254}255 256static void mock_add_to_engine(struct i915_request *rq)257{258 lockdep_assert_held(&rq->engine->sched_engine->lock);259 list_move_tail(&rq->sched.link, &rq->engine->sched_engine->requests);260}261 262static void mock_remove_from_engine(struct i915_request *rq)263{264 struct intel_engine_cs *engine, *locked;265 266 /*267 * Virtual engines complicate acquiring the engine timeline lock,268 * as their rq->engine pointer is not stable until under that269 * engine lock. The simple ploy we use is to take the lock then270 * check that the rq still belongs to the newly locked engine.271 */272 273 locked = READ_ONCE(rq->engine);274 spin_lock_irq(&locked->sched_engine->lock);275 while (unlikely(locked != (engine = READ_ONCE(rq->engine)))) {276 spin_unlock(&locked->sched_engine->lock);277 spin_lock(&engine->sched_engine->lock);278 locked = engine;279 }280 list_del_init(&rq->sched.link);281 spin_unlock_irq(&locked->sched_engine->lock);282}283 284static void mock_reset_prepare(struct intel_engine_cs *engine)285{286}287 288static void mock_reset_rewind(struct intel_engine_cs *engine, bool stalled)289{290 GEM_BUG_ON(stalled);291}292 293static void mock_reset_cancel(struct intel_engine_cs *engine)294{295 struct mock_engine *mock =296 container_of(engine, typeof(*mock), base);297 struct i915_request *rq;298 unsigned long flags;299 300 del_timer_sync(&mock->hw_delay);301 302 spin_lock_irqsave(&engine->sched_engine->lock, flags);303 304 /* Mark all submitted requests as skipped. */305 list_for_each_entry(rq, &engine->sched_engine->requests, sched.link)306 i915_request_put(i915_request_mark_eio(rq));307 intel_engine_signal_breadcrumbs(engine);308 309 /* Cancel and submit all pending requests. */310 list_for_each_entry(rq, &mock->hw_queue, mock.link) {311 if (i915_request_mark_eio(rq)) {312 __i915_request_submit(rq);313 i915_request_put(rq);314 }315 }316 INIT_LIST_HEAD(&mock->hw_queue);317 318 spin_unlock_irqrestore(&engine->sched_engine->lock, flags);319}320 321static void mock_reset_finish(struct intel_engine_cs *engine)322{323}324 325static void mock_engine_release(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 i915_sched_engine_put(engine->sched_engine);333 intel_breadcrumbs_put(engine->breadcrumbs);334 335 intel_context_unpin(engine->kernel_context);336 intel_context_put(engine->kernel_context);337 338 intel_engine_fini_retire(engine);339}340 341struct intel_engine_cs *mock_engine(struct drm_i915_private *i915,342 const char *name,343 int id)344{345 struct mock_engine *engine;346 347 GEM_BUG_ON(id >= I915_NUM_ENGINES);348 GEM_BUG_ON(!to_gt(i915)->uncore);349 350 engine = kzalloc(sizeof(*engine) + PAGE_SIZE, GFP_KERNEL);351 if (!engine)352 return NULL;353 354 /* minimal engine setup for requests */355 engine->base.i915 = i915;356 engine->base.gt = to_gt(i915);357 engine->base.uncore = to_gt(i915)->uncore;358 snprintf(engine->base.name, sizeof(engine->base.name), "%s", name);359 engine->base.id = id;360 engine->base.mask = BIT(id);361 engine->base.legacy_idx = INVALID_ENGINE;362 engine->base.instance = id;363 engine->base.status_page.addr = (void *)(engine + 1);364 365 engine->base.cops = &mock_context_ops;366 engine->base.request_alloc = mock_request_alloc;367 engine->base.emit_flush = mock_emit_flush;368 engine->base.emit_fini_breadcrumb = mock_emit_breadcrumb;369 engine->base.submit_request = mock_submit_request;370 engine->base.add_active_request = mock_add_to_engine;371 engine->base.remove_active_request = mock_remove_from_engine;372 373 engine->base.reset.prepare = mock_reset_prepare;374 engine->base.reset.rewind = mock_reset_rewind;375 engine->base.reset.cancel = mock_reset_cancel;376 engine->base.reset.finish = mock_reset_finish;377 378 engine->base.release = mock_engine_release;379 380 to_gt(i915)->engine[id] = &engine->base;381 to_gt(i915)->engine_class[0][id] = &engine->base;382 383 /* fake hw queue */384 spin_lock_init(&engine->hw_lock);385 timer_setup(&engine->hw_delay, hw_delay_complete, 0);386 INIT_LIST_HEAD(&engine->hw_queue);387 388 intel_engine_add_user(&engine->base);389 390 return &engine->base;391}392 393int mock_engine_init(struct intel_engine_cs *engine)394{395 struct intel_context *ce;396 397 INIT_LIST_HEAD(&engine->pinned_contexts_list);398 399 engine->sched_engine = i915_sched_engine_create(ENGINE_MOCK);400 if (!engine->sched_engine)401 return -ENOMEM;402 engine->sched_engine->private_data = engine;403 404 intel_engine_init_execlists(engine);405 intel_engine_init__pm(engine);406 intel_engine_init_retire(engine);407 408 engine->breadcrumbs = intel_breadcrumbs_create(NULL);409 if (!engine->breadcrumbs)410 goto err_schedule;411 412 ce = create_kernel_context(engine);413 if (IS_ERR(ce))414 goto err_breadcrumbs;415 416 /* We insist the kernel context is using the status_page */417 engine->status_page.vma = ce->timeline->hwsp_ggtt;418 419 engine->kernel_context = ce;420 return 0;421 422err_breadcrumbs:423 intel_breadcrumbs_put(engine->breadcrumbs);424err_schedule:425 i915_sched_engine_put(engine->sched_engine);426 return -ENOMEM;427}428 429void mock_engine_flush(struct intel_engine_cs *engine)430{431 struct mock_engine *mock =432 container_of(engine, typeof(*mock), base);433 struct i915_request *request, *rn;434 435 del_timer_sync(&mock->hw_delay);436 437 spin_lock_irq(&mock->hw_lock);438 list_for_each_entry_safe(request, rn, &mock->hw_queue, mock.link)439 advance(request);440 spin_unlock_irq(&mock->hw_lock);441}442 443void mock_engine_reset(struct intel_engine_cs *engine)444{445}446