/* SPDX-License-Identifier: GPL-2.0 OR MIT *//************************************************************************** * * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA * 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: Thomas Hellstrom <thellstrom-at-vmware-dot-com> * 	    Jerome Glisse */#include <linux/module.h>#include <linux/device.h>#include <linux/pgtable.h>#include <linux/sched.h>#include <linux/debugfs.h>#include <drm/drm_sysfs.h>#include <drm/ttm/ttm_caching.h> #include "ttm_module.h" /** * DOC: TTM * * TTM is a memory manager for accelerator devices with dedicated memory. * * The basic idea is that resources are grouped together in buffer objects of * certain size and TTM handles lifetime, movement and CPU mappings of those * objects. * * TODO: Add more design background and information here. */ /** * ttm_prot_from_caching - Modify the page protection according to the * ttm cacing mode * @caching: The ttm caching mode * @tmp: The original page protection * * Return: The modified page protection */pgprot_t ttm_prot_from_caching(enum ttm_caching caching, pgprot_t tmp){	/* Cached mappings need no adjustment */	if (caching == ttm_cached)		return tmp; #if defined(__i386__) || defined(__x86_64__)	if (caching == ttm_write_combined)		tmp = pgprot_writecombine(tmp);#ifndef CONFIG_UML	else if (boot_cpu_data.x86 > 3)		tmp = pgprot_noncached(tmp);#endif /* CONFIG_UML */#endif /* __i386__ || __x86_64__ */#if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \	defined(__powerpc__) || defined(__mips__) || defined(__loongarch__) || \	defined(__riscv)	if (caching == ttm_write_combined)		tmp = pgprot_writecombine(tmp);	else		tmp = pgprot_noncached(tmp);#endif#if defined(__sparc__)	tmp = pgprot_noncached(tmp);#endif	return tmp;} MODULE_AUTHOR("Thomas Hellstrom, Jerome Glisse");MODULE_DESCRIPTION("TTM memory manager subsystem (for DRM device)");MODULE_LICENSE("GPL and additional rights");