^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /**************************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright 2009 Red Hat Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Permission is hereby granted, free of charge, to any person obtaining a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * copy of this software and associated documentation files (the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * "Software"), to deal in the Software without restriction, including
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * without limitation the rights to use, copy, modify, merge, publish,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * distribute, sub license, and/or sell copies of the Software, and to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * permit persons to whom the Software is furnished to do so, subject to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * the following conditions:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * The above copyright notice and this permission notice (including the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * next paragraph) shall be included in all copies or substantial portions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * of the Software.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * USE OR OTHER DEALINGS IN THE SOFTWARE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) **************************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * Authors:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * Dave Airlie <airlied@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #ifndef _DRM_CACHE_H_
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define _DRM_CACHE_H_
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <linux/scatterlist.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) void drm_clflush_pages(struct page *pages[], unsigned long num_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) void drm_clflush_sg(struct sg_table *st);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) void drm_clflush_virt_range(void *addr, unsigned long length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) bool drm_need_swiotlb(int dma_bits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static inline bool drm_arch_can_wc_memory(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #if defined(CONFIG_PPC) && !defined(CONFIG_NOT_COHERENT_CACHE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #elif defined(CONFIG_MIPS) && defined(CONFIG_CPU_LOONGSON64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #elif defined(CONFIG_ARM) || defined(CONFIG_ARM64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * The DRM driver stack is designed to work with cache coherent devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * only, but permits an optimization to be enabled in some cases, where
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * for some buffers, both the CPU and the GPU use uncached mappings,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * removing the need for DMA snooping and allocation in the CPU caches.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * The use of uncached GPU mappings relies on the correct implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * of the PCIe NoSnoop TLP attribute by the platform, otherwise the GPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * will use cached mappings nonetheless. On x86 platforms, this does not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * seem to matter, as uncached CPU mappings will snoop the caches in any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * case. However, on ARM and arm64, enabling this optimization on a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * platform where NoSnoop is ignored results in loss of coherency, which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * breaks correct operation of the device. Since we have no way of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * detecting whether NoSnoop works or not, just disable this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * optimization entirely for ARM and arm64.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) #endif
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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