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a89d1f921c
We need to move to a more flexible timeline that doesn't assume one fence context per engine, and so allow for a single timeline to be used across a combination of engines. This means that preallocating a fence context per engine is now a hindrance, and so we want to introduce the singular timeline. From the code perspective, this has the notable advantage of clearing up a lot of mirky semantics and some clumsy pointer chasing. By splitting the timeline up into a single entity rather than an array of per-engine timelines, we can realise the goal of the previous patch of tracking the timeline alongside the ring. v2: Tweak wait_for_idle to stop the compiling thinking that ret may be uninitialised. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180502163839.3248-2-chris@chris-wilson.co.uk
127 lines
4.0 KiB
C
127 lines
4.0 KiB
C
/*
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* Copyright © 2016 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#ifndef I915_TIMELINE_H
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#define I915_TIMELINE_H
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#include <linux/list.h>
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#include <linux/kref.h>
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#include "i915_request.h"
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#include "i915_syncmap.h"
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#include "i915_utils.h"
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struct i915_timeline {
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u64 fence_context;
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u32 seqno;
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spinlock_t lock;
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/**
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* List of breadcrumbs associated with GPU requests currently
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* outstanding.
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*/
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struct list_head requests;
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/* Contains an RCU guarded pointer to the last request. No reference is
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* held to the request, users must carefully acquire a reference to
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* the request using i915_gem_active_get_request_rcu(), or hold the
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* struct_mutex.
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*/
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struct i915_gem_active last_request;
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/**
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* We track the most recent seqno that we wait on in every context so
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* that we only have to emit a new await and dependency on a more
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* recent sync point. As the contexts may be executed out-of-order, we
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* have to track each individually and can not rely on an absolute
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* global_seqno. When we know that all tracked fences are completed
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* (i.e. when the driver is idle), we know that the syncmap is
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* redundant and we can discard it without loss of generality.
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*/
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struct i915_syncmap *sync;
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/**
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* Separately to the inter-context seqno map above, we track the last
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* barrier (e.g. semaphore wait) to the global engine timelines. Note
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* that this tracks global_seqno rather than the context.seqno, and
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* so it is subject to the limitations of hw wraparound and that we
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* may need to revoke global_seqno (on pre-emption).
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*/
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u32 global_sync[I915_NUM_ENGINES];
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struct list_head link;
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const char *name;
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struct kref kref;
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};
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void i915_timeline_init(struct drm_i915_private *i915,
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struct i915_timeline *tl,
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const char *name);
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void i915_timeline_fini(struct i915_timeline *tl);
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struct i915_timeline *
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i915_timeline_create(struct drm_i915_private *i915, const char *name);
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static inline struct i915_timeline *
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i915_timeline_get(struct i915_timeline *timeline)
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{
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kref_get(&timeline->kref);
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return timeline;
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}
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void __i915_timeline_free(struct kref *kref);
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static inline void i915_timeline_put(struct i915_timeline *timeline)
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{
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kref_put(&timeline->kref, __i915_timeline_free);
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}
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static inline int __i915_timeline_sync_set(struct i915_timeline *tl,
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u64 context, u32 seqno)
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{
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return i915_syncmap_set(&tl->sync, context, seqno);
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}
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static inline int i915_timeline_sync_set(struct i915_timeline *tl,
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const struct dma_fence *fence)
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{
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return __i915_timeline_sync_set(tl, fence->context, fence->seqno);
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}
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static inline bool __i915_timeline_sync_is_later(struct i915_timeline *tl,
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u64 context, u32 seqno)
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{
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return i915_syncmap_is_later(&tl->sync, context, seqno);
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}
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static inline bool i915_timeline_sync_is_later(struct i915_timeline *tl,
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const struct dma_fence *fence)
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{
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return __i915_timeline_sync_is_later(tl, fence->context, fence->seqno);
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}
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void i915_timelines_park(struct drm_i915_private *i915);
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#endif
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