/************************************************************************** * * Copyright (c) 2006-2007 Tungsten Graphics, Inc., Cedar Park, TX., 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 Hellström <thomas-at-tungstengraphics-dot-com> */ #include <linux/export.h>#include <drm/drmP.h> #if defined(CONFIG_X86) /* * clflushopt is an unordered instruction which needs fencing with mfence or * sfence to avoid ordering issues.  For drm_clflush_page this fencing happens * in the caller. */static voiddrm_clflush_page(struct page *page){	uint8_t *page_virtual;	unsigned int i;	const int size = boot_cpu_data.x86_clflush_size; 	if (unlikely(page == NULL))		return; 	page_virtual = kmap_atomic(page);	for (i = 0; i < PAGE_SIZE; i += size)		clflushopt(page_virtual + i);	kunmap_atomic(page_virtual);} static void drm_cache_flush_clflush(struct page *pages[],				    unsigned long num_pages){	unsigned long i; 	mb();	for (i = 0; i < num_pages; i++)		drm_clflush_page(*pages++);	mb();} static voiddrm_clflush_ipi_handler(void *null){	wbinvd();}#endif voiddrm_clflush_pages(struct page *pages[], unsigned long num_pages){ #if defined(CONFIG_X86)	if (cpu_has_clflush) {		drm_cache_flush_clflush(pages, num_pages);		return;	} 	if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)		printk(KERN_ERR "Timed out waiting for cache flush.\n"); #elif defined(__powerpc__)	unsigned long i;	for (i = 0; i < num_pages; i++) {		struct page *page = pages[i];		void *page_virtual; 		if (unlikely(page == NULL))			continue; 		page_virtual = kmap_atomic(page);		flush_dcache_range((unsigned long)page_virtual,				   (unsigned long)page_virtual + PAGE_SIZE);		kunmap_atomic(page_virtual);	}#else	printk(KERN_ERR "Architecture has no drm_cache.c support\n");	WARN_ON_ONCE(1);#endif}EXPORT_SYMBOL(drm_clflush_pages); voiddrm_clflush_sg(struct sg_table *st){#if defined(CONFIG_X86)	if (cpu_has_clflush) {		struct sg_page_iter sg_iter; 		mb();		for_each_sg_page(st->sgl, &sg_iter, st->nents, 0)			drm_clflush_page(sg_page_iter_page(&sg_iter));		mb(); 		return;	} 	if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)		printk(KERN_ERR "Timed out waiting for cache flush.\n");#else	printk(KERN_ERR "Architecture has no drm_cache.c support\n");	WARN_ON_ONCE(1);#endif}EXPORT_SYMBOL(drm_clflush_sg); voiddrm_clflush_virt_range(void *addr, unsigned long length){#if defined(CONFIG_X86)	if (cpu_has_clflush) {		void *end = addr + length;		mb();		for (; addr < end; addr += boot_cpu_data.x86_clflush_size)			clflushopt(addr);		clflushopt(end - 1);		mb();		return;	} 	if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)		printk(KERN_ERR "Timed out waiting for cache flush.\n");#else	printk(KERN_ERR "Architecture has no drm_cache.c support\n");	WARN_ON_ONCE(1);#endif}EXPORT_SYMBOL(drm_clflush_virt_range);