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eca56a3511
It is required that the caller declare the exact number of dwords they wish to write into the ring. This is required for two reasons, we need to allocate sufficient space for the entire command packet and we need to be sure that the contents are completely written to avoid executing stale data. The current interface requires for any bug to be caught in review, the reader has to carefully count the number of intel_ring_emit() between intel_ring_begin() and intel_ring_advance(). If we record the end of the packet of each intel_ring_begin() we can also have CI check for us. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170206170502.30944-1-chris@chris-wilson.co.uk
48 lines
1.7 KiB
C
48 lines
1.7 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_H__
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#define __I915_GEM_H__
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#ifdef CONFIG_DRM_I915_DEBUG_GEM
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#define GEM_BUG_ON(expr) BUG_ON(expr)
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#define GEM_WARN_ON(expr) WARN_ON(expr)
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#define GEM_BUG_ONLY(expr) expr
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#define GEM_BUG_ONLY_DECLARE(var) var
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#define GEM_BUG_ONLY_ON(expr) GEM_BUG_ON(expr)
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#else
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#define GEM_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr)
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#define GEM_WARN_ON(expr) (BUILD_BUG_ON_INVALID(expr), 0)
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#define GEM_BUG_ONLY(expr) do { } while (0)
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#define GEM_BUG_ONLY_DECLARE(var)
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#define GEM_BUG_ONLY_ON(expr)
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#endif
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#define I915_NUM_ENGINES 5
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#endif /* __I915_GEM_H__ */
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