| /************************************************************************** |
| * |
| * 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) |
| static void |
| drm_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) |
| clflush(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 void |
| drm_clflush_ipi_handler(void *null) |
| { |
| wbinvd(); |
| } |
| #endif |
| |
| void |
| drm_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); |
| |
| void |
| drm_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_iter.page); |
| 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); |
| |
| void |
| drm_clflush_virt_range(char *addr, unsigned long length) |
| { |
| #if defined(CONFIG_X86) |
| if (cpu_has_clflush) { |
| char *end = addr + length; |
| mb(); |
| for (; addr < end; addr += boot_cpu_data.x86_clflush_size) |
| clflush(addr); |
| clflush(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); |