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0c7112a002
Having moved the priotree struct into i915_scheduler.h, identify it as the scheduling element and rebrand into i915_sched. This becomes more useful as we start attaching more information we require to propagate through the scheduler. v2: Use i915_sched_node for future distinctiveness Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180418184052.7129-2-chris@chris-wilson.co.uk
58 lines
1.9 KiB
C
58 lines
1.9 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright © 2018 Intel Corporation
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*/
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#ifndef _I915_SCHEDULER_H_
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#define _I915_SCHEDULER_H_
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#include <linux/bitops.h>
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#include <uapi/drm/i915_drm.h>
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enum {
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I915_PRIORITY_MIN = I915_CONTEXT_MIN_USER_PRIORITY - 1,
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I915_PRIORITY_NORMAL = I915_CONTEXT_DEFAULT_PRIORITY,
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I915_PRIORITY_MAX = I915_CONTEXT_MAX_USER_PRIORITY + 1,
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I915_PRIORITY_INVALID = INT_MIN
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};
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/*
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* "People assume that time is a strict progression of cause to effect, but
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* actually, from a nonlinear, non-subjective viewpoint, it's more like a big
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* ball of wibbly-wobbly, timey-wimey ... stuff." -The Doctor, 2015
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*
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* Requests exist in a complex web of interdependencies. Each request
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* has to wait for some other request to complete before it is ready to be run
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* (e.g. we have to wait until the pixels have been rendering into a texture
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* before we can copy from it). We track the readiness of a request in terms
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* of fences, but we also need to keep the dependency tree for the lifetime
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* of the request (beyond the life of an individual fence). We use the tree
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* at various points to reorder the requests whilst keeping the requests
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* in order with respect to their various dependencies.
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*
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* There is no active component to the "scheduler". As we know the dependency
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* DAG of each request, we are able to insert it into a sorted queue when it
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* is ready, and are able to reorder its portion of the graph to accommodate
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* dynamic priority changes.
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*/
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struct i915_sched_node {
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struct list_head signalers_list; /* those before us, we depend upon */
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struct list_head waiters_list; /* those after us, they depend upon us */
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struct list_head link;
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int priority;
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};
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struct i915_dependency {
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struct i915_sched_node *signaler;
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struct list_head signal_link;
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struct list_head wait_link;
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struct list_head dfs_link;
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unsigned long flags;
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#define I915_DEPENDENCY_ALLOC BIT(0)
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};
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#endif /* _I915_SCHEDULER_H_ */
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