forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
80 lines
3.0 KiB
80 lines
3.0 KiB
/************************************************************************** |
|
* |
|
* Copyright 2009 Red Hat Inc. |
|
* All Rights Reserved. |
|
* |
|
* Permission is hereby granted, free of charge, to any person obtaining a |
|
* copy of this software and associated documentation files (the |
|
* "Software"), to deal in the Software without restriction, including |
|
* without limitation the rights to use, copy, modify, merge, publish, |
|
* distribute, sub license, and/or sell copies of the Software, and to |
|
* permit persons to whom the Software is furnished to do so, subject to |
|
* the following conditions: |
|
* |
|
* The above copyright notice and this permission notice (including the |
|
* next paragraph) shall be included in all copies or substantial portions |
|
* of the Software. |
|
* |
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
|
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
|
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, |
|
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
|
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
|
* USE OR OTHER DEALINGS IN THE SOFTWARE. |
|
* |
|
* |
|
**************************************************************************/ |
|
/* |
|
* Authors: |
|
* Dave Airlie <[email protected]> |
|
*/ |
|
|
|
#ifndef _DRM_CACHE_H_ |
|
#define _DRM_CACHE_H_ |
|
|
|
#include <linux/scatterlist.h> |
|
|
|
struct dma_buf_map; |
|
|
|
void drm_clflush_pages(struct page *pages[], unsigned long num_pages); |
|
void drm_clflush_sg(struct sg_table *st); |
|
void drm_clflush_virt_range(void *addr, unsigned long length); |
|
bool drm_need_swiotlb(int dma_bits); |
|
|
|
|
|
static inline bool drm_arch_can_wc_memory(void) |
|
{ |
|
#if defined(CONFIG_PPC) && !defined(CONFIG_NOT_COHERENT_CACHE) |
|
return false; |
|
#elif defined(CONFIG_MIPS) && defined(CONFIG_CPU_LOONGSON64) |
|
return false; |
|
#elif defined(CONFIG_ARM) || defined(CONFIG_ARM64) |
|
/* |
|
* The DRM driver stack is designed to work with cache coherent devices |
|
* only, but permits an optimization to be enabled in some cases, where |
|
* for some buffers, both the CPU and the GPU use uncached mappings, |
|
* removing the need for DMA snooping and allocation in the CPU caches. |
|
* |
|
* The use of uncached GPU mappings relies on the correct implementation |
|
* of the PCIe NoSnoop TLP attribute by the platform, otherwise the GPU |
|
* will use cached mappings nonetheless. On x86 platforms, this does not |
|
* seem to matter, as uncached CPU mappings will snoop the caches in any |
|
* case. However, on ARM and arm64, enabling this optimization on a |
|
* platform where NoSnoop is ignored results in loss of coherency, which |
|
* breaks correct operation of the device. Since we have no way of |
|
* detecting whether NoSnoop works or not, just disable this |
|
* optimization entirely for ARM and arm64. |
|
*/ |
|
return false; |
|
#else |
|
return true; |
|
#endif |
|
} |
|
|
|
void drm_memcpy_init_early(void); |
|
|
|
void drm_memcpy_from_wc(struct dma_buf_map *dst, |
|
const struct dma_buf_map *src, |
|
unsigned long len); |
|
#endif
|
|
|