62347f9e0f
Clients like i915 need to segregate cache domains within the GTT which can lead to small amounts of fragmentation. By allocating the uncached buffers from the bottom and the cacheable buffers from the top, we can reduce the amount of wasted space and also optimize allocation of the mappable portion of the GTT to only those buffers that require CPU access through the GTT. For other drivers, allocating small bos from one end and large ones from the other helps improve the quality of fragmentation. Based on drm_mm work by Chris Wilson. v3: Changed to use a TTM placement flag v2: Updated kerneldoc Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Ben Widawsky <ben@bwidawsk.net> Cc: Christian König <deathsimple@vodafone.de> Signed-off-by: Lauri Kasanen <cand@gmx.com> Signed-off-by: David Airlie <airlied@redhat.com>
96 lines
3.5 KiB
C
96 lines
3.5 KiB
C
/**************************************************************************
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*
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* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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* All Rights Reserved.
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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
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the 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 NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/*
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* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
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*/
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#ifndef _TTM_PLACEMENT_H_
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#define _TTM_PLACEMENT_H_
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/*
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* Memory regions for data placement.
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*/
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#define TTM_PL_SYSTEM 0
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#define TTM_PL_TT 1
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#define TTM_PL_VRAM 2
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#define TTM_PL_PRIV0 3
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#define TTM_PL_PRIV1 4
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#define TTM_PL_PRIV2 5
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#define TTM_PL_PRIV3 6
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#define TTM_PL_PRIV4 7
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#define TTM_PL_PRIV5 8
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#define TTM_PL_SWAPPED 15
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#define TTM_PL_FLAG_SYSTEM (1 << TTM_PL_SYSTEM)
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#define TTM_PL_FLAG_TT (1 << TTM_PL_TT)
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#define TTM_PL_FLAG_VRAM (1 << TTM_PL_VRAM)
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#define TTM_PL_FLAG_PRIV0 (1 << TTM_PL_PRIV0)
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#define TTM_PL_FLAG_PRIV1 (1 << TTM_PL_PRIV1)
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#define TTM_PL_FLAG_PRIV2 (1 << TTM_PL_PRIV2)
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#define TTM_PL_FLAG_PRIV3 (1 << TTM_PL_PRIV3)
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#define TTM_PL_FLAG_PRIV4 (1 << TTM_PL_PRIV4)
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#define TTM_PL_FLAG_PRIV5 (1 << TTM_PL_PRIV5)
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#define TTM_PL_FLAG_SWAPPED (1 << TTM_PL_SWAPPED)
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#define TTM_PL_MASK_MEM 0x0000FFFF
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/*
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* Other flags that affects data placement.
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* TTM_PL_FLAG_CACHED indicates cache-coherent mappings
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* if available.
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* TTM_PL_FLAG_SHARED means that another application may
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* reference the buffer.
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* TTM_PL_FLAG_NO_EVICT means that the buffer may never
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* be evicted to make room for other buffers.
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* TTM_PL_FLAG_TOPDOWN requests to be placed from the
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* top of the memory area, instead of the bottom.
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*/
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#define TTM_PL_FLAG_CACHED (1 << 16)
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#define TTM_PL_FLAG_UNCACHED (1 << 17)
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#define TTM_PL_FLAG_WC (1 << 18)
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#define TTM_PL_FLAG_SHARED (1 << 20)
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#define TTM_PL_FLAG_NO_EVICT (1 << 21)
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#define TTM_PL_FLAG_TOPDOWN (1 << 22)
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#define TTM_PL_MASK_CACHING (TTM_PL_FLAG_CACHED | \
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TTM_PL_FLAG_UNCACHED | \
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TTM_PL_FLAG_WC)
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#define TTM_PL_MASK_MEMTYPE (TTM_PL_MASK_MEM | TTM_PL_MASK_CACHING)
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/*
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* Access flags to be used for CPU- and GPU- mappings.
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* The idea is that the TTM synchronization mechanism will
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* allow concurrent READ access and exclusive write access.
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* Currently GPU- and CPU accesses are exclusive.
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*/
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#define TTM_ACCESS_READ (1 << 0)
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#define TTM_ACCESS_WRITE (1 << 1)
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#endif
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