28176ef4cf
A restriction on our global seqno is that they cannot wrap, and that we cannot use the value 0. This allows us to detect when a request has not yet been submitted, its global seqno is still 0, and ensures that hardware semaphores are monotonic as required by older hardware. To meet these restrictions when we defer the assignment of the global seqno, we must check that we have an available slot in the global seqno space during request construction. If that test fails, we wait for all requests to be completed and reset the hardware back to 0. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20161028125858.23563-33-chris@chris-wilson.co.uk
72 lines
2.2 KiB
C
72 lines
2.2 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 last_submitted_seqno;
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u32 last_pending_seqno;
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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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atomic_t next_seqno;
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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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void i915_gem_timeline_fini(struct i915_gem_timeline *tl);
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#endif
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