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bb89485e99
In order to simplify the lockdep annotation, as they become more complex in the future with deferred execution and multiple paths through the same functions, create a separate lockclass for the user timeline and the hardware execution timeline. We should only ever be locking the user timeline and the execution timeline in parallel so we only need to create two lock classes, rather than a separate class for every timeline. v2: Rename the lock classes to be more consistent with other lockdep. 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/20161114204105.29171-2-chris@chris-wilson.co.uk
91 lines
2.8 KiB
C
91 lines
2.8 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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#include "i915_drv.h"
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static int __i915_gem_timeline_init(struct drm_i915_private *i915,
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struct i915_gem_timeline *timeline,
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const char *name,
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struct lock_class_key *lockclass,
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const char *lockname)
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{
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unsigned int i;
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u64 fences;
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lockdep_assert_held(&i915->drm.struct_mutex);
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timeline->i915 = i915;
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timeline->name = kstrdup(name ?: "[kernel]", GFP_KERNEL);
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if (!timeline->name)
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return -ENOMEM;
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list_add(&timeline->link, &i915->gt.timelines);
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/* Called during early_init before we know how many engines there are */
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fences = dma_fence_context_alloc(ARRAY_SIZE(timeline->engine));
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for (i = 0; i < ARRAY_SIZE(timeline->engine); i++) {
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struct intel_timeline *tl = &timeline->engine[i];
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tl->fence_context = fences++;
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tl->common = timeline;
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#ifdef CONFIG_DEBUG_SPINLOCK
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__raw_spin_lock_init(&tl->lock.rlock, lockname, lockclass);
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#else
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spin_lock_init(&tl->lock);
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#endif
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init_request_active(&tl->last_request, NULL);
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INIT_LIST_HEAD(&tl->requests);
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}
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return 0;
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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 *timeline,
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const char *name)
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{
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static struct lock_class_key class;
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return __i915_gem_timeline_init(i915, timeline, name,
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&class, "&timeline->lock");
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}
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int i915_gem_timeline_init__global(struct drm_i915_private *i915)
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{
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static struct lock_class_key class;
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return __i915_gem_timeline_init(i915,
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&i915->gt.global_timeline,
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"[execution]",
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&class, "&global_timeline->lock");
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}
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void i915_gem_timeline_fini(struct i915_gem_timeline *tl)
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{
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lockdep_assert_held(&tl->i915->drm.struct_mutex);
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list_del(&tl->link);
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kfree(tl->name);
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}
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