9b6586ae9f
Replace the global device seqno with one for each engine, and account for in-flight seqno on each separately. This is consistent with dma-fence as each timeline has separate fence-contexts for each engine and a seqno is only ordered within a fence-context (i.e. seqno do not need to be ordered wrt to other engines, just ordered within a single engine). This is required to enable request rewinding for preemption on individual engines (we have to rewind the global seqno to avoid overflow, and we do not have to rewind all engines just to preempt one.) v2: Rename active_seqno to inflight_seqnos to more clearly indicate that it is a counter and not equivalent to the existing seqno. Update functions that operated on active_seqno similarly. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170223074422.4125-3-chris@chris-wilson.co.uk
79 lines
2.4 KiB
C
79 lines
2.4 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_GEM_TIMELINE_H
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#define I915_GEM_TIMELINE_H
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#include <linux/list.h>
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#include "i915_gem_request.h"
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struct i915_gem_timeline;
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struct intel_timeline {
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u64 fence_context;
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u32 seqno;
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/**
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* Count of outstanding requests, from the time they are constructed
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* to the moment they are retired. Loosely coupled to hardware.
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*/
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u32 inflight_seqnos;
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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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u32 sync_seqno[I915_NUM_ENGINES];
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struct i915_gem_timeline *common;
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};
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struct i915_gem_timeline {
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struct list_head link;
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struct drm_i915_private *i915;
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const char *name;
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struct intel_timeline engine[I915_NUM_ENGINES];
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};
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int i915_gem_timeline_init(struct drm_i915_private *i915,
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struct i915_gem_timeline *tl,
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const char *name);
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int i915_gem_timeline_init__global(struct drm_i915_private *i915);
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void i915_gem_timeline_fini(struct i915_gem_timeline *tl);
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#endif
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