/*
|
* SPDX-License-Identifier: MIT
|
*
|
* Copyright © 2016-2018 Intel Corporation
|
*/
|
|
#include "i915_drv.h"
|
|
#include "i915_timeline.h"
|
#include "i915_syncmap.h"
|
|
void i915_timeline_init(struct drm_i915_private *i915,
|
struct i915_timeline *timeline,
|
const char *name)
|
{
|
lockdep_assert_held(&i915->drm.struct_mutex);
|
|
/*
|
* Ideally we want a set of engines on a single leaf as we expect
|
* to mostly be tracking synchronisation between engines. It is not
|
* a huge issue if this is not the case, but we may want to mitigate
|
* any page crossing penalties if they become an issue.
|
*/
|
BUILD_BUG_ON(KSYNCMAP < I915_NUM_ENGINES);
|
|
timeline->name = name;
|
|
list_add(&timeline->link, &i915->gt.timelines);
|
|
/* Called during early_init before we know how many engines there are */
|
|
timeline->fence_context = dma_fence_context_alloc(1);
|
|
spin_lock_init(&timeline->lock);
|
|
init_request_active(&timeline->last_request, NULL);
|
INIT_LIST_HEAD(&timeline->requests);
|
|
i915_syncmap_init(&timeline->sync);
|
}
|
|
/**
|
* i915_timelines_park - called when the driver idles
|
* @i915: the drm_i915_private device
|
*
|
* When the driver is completely idle, we know that all of our sync points
|
* have been signaled and our tracking is then entirely redundant. Any request
|
* to wait upon an older sync point will be completed instantly as we know
|
* the fence is signaled and therefore we will not even look them up in the
|
* sync point map.
|
*/
|
void i915_timelines_park(struct drm_i915_private *i915)
|
{
|
struct i915_timeline *timeline;
|
|
lockdep_assert_held(&i915->drm.struct_mutex);
|
|
list_for_each_entry(timeline, &i915->gt.timelines, link) {
|
/*
|
* All known fences are completed so we can scrap
|
* the current sync point tracking and start afresh,
|
* any attempt to wait upon a previous sync point
|
* will be skipped as the fence was signaled.
|
*/
|
i915_syncmap_free(&timeline->sync);
|
}
|
}
|
|
void i915_timeline_fini(struct i915_timeline *timeline)
|
{
|
GEM_BUG_ON(!list_empty(&timeline->requests));
|
|
i915_syncmap_free(&timeline->sync);
|
|
list_del(&timeline->link);
|
}
|
|
struct i915_timeline *
|
i915_timeline_create(struct drm_i915_private *i915, const char *name)
|
{
|
struct i915_timeline *timeline;
|
|
timeline = kzalloc(sizeof(*timeline), GFP_KERNEL);
|
if (!timeline)
|
return ERR_PTR(-ENOMEM);
|
|
i915_timeline_init(i915, timeline, name);
|
kref_init(&timeline->kref);
|
|
return timeline;
|
}
|
|
void __i915_timeline_free(struct kref *kref)
|
{
|
struct i915_timeline *timeline =
|
container_of(kref, typeof(*timeline), kref);
|
|
i915_timeline_fini(timeline);
|
kfree(timeline);
|
}
|
|
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
|
#include "selftests/mock_timeline.c"
|
#include "selftests/i915_timeline.c"
|
#endif
|
