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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889/************************************************************************** * * 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 <airlied@redhat.com> */
#ifndef _DRM_CACHE_H_#define _DRM_CACHE_H_
#include <linux/scatterlist.h>
struct iosys_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;#elif defined(CONFIG_LOONGARCH) /* * LoongArch maintains cache coherency in hardware, but its WUC attribute * (Weak-ordered UnCached, which is similar to WC) is out of the scope of * cache coherency machanism. This means WUC can only used for write-only * memory regions. */ return false;#else return true;#endif}
void drm_memcpy_init_early(void);
void drm_memcpy_from_wc(struct iosys_map *dst, const struct iosys_map *src, unsigned long len);#endif