LXR linux/drivers/gpu/drm/drm

   1/**************************************************************************
   2 *
   3 * Copyright (c) 2006-2007 Tungsten Graphics, Inc., Cedar Park, TX., USA
   4 * All Rights Reserved.
   5 *
   6 * Permission is hereby granted, free of charge, to any person obtaining a
   7 * copy of this software and associated documentation files (the
   8 * "Software"), to deal in the Software without restriction, including
   9 * without limitation the rights to use, copy, modify, merge, publish,
  10 * distribute, sub license, and/or sell copies of the Software, and to
  11 * permit persons to whom the Software is furnished to do so, subject to
  12 * the following conditions:
  13 *
  14 * The above copyright notice and this permission notice (including the
  15 * next paragraph) shall be included in all copies or substantial portions
  16 * of the Software.
  17 *
  18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25 *
  26 **************************************************************************/
  27/*
  28 * Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
  29 */
  30
  31#include "drmP.h"
  32
  33#if defined(CONFIG_X86)
  34static void
  35drm_clflush_page(struct page *page)
  36{
  37        uint8_t *page_virtual;
  38        unsigned int i;
  39
  40        if (unlikely(page == NULL))
  41                return;
  42
  43        page_virtual = kmap_atomic(page, KM_USER0);
  44        for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
  45                clflush(page_virtual + i);
  46        kunmap_atomic(page_virtual, KM_USER0);
  47}
  48
  49static void drm_cache_flush_clflush(struct page *pages[],
  50                                    unsigned long num_pages)
  51{
  52        unsigned long i;
  53
  54        mb();
  55        for (i = 0; i < num_pages; i++)
  56                drm_clflush_page(*pages++);
  57        mb();
  58}
  59
  60static void
  61drm_clflush_ipi_handler(void *null)
  62{
  63        wbinvd();
  64}
  65#endif
  66
  67void
  68drm_clflush_pages(struct page *pages[], unsigned long num_pages)
  69{
  70
  71#if defined(CONFIG_X86)
  72        if (cpu_has_clflush) {
  73                drm_cache_flush_clflush(pages, num_pages);
  74                return;
  75        }
  76
  77        if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
  78                printk(KERN_ERR "Timed out waiting for cache flush.\n");
  79
  80#elif defined(__powerpc__)
  81        unsigned long i;
  82        for (i = 0; i < num_pages; i++) {
  83                struct page *page = pages[i];
  84                void *page_virtual;
  85
  86                if (unlikely(page == NULL))
  87                        continue;
  88
  89                page_virtual = kmap_atomic(page, KM_USER0);
  90                flush_dcache_range((unsigned long)page_virtual,
  91                                   (unsigned long)page_virtual + PAGE_SIZE);
  92                kunmap_atomic(page_virtual, KM_USER0);
  93        }
  94#else
  95        printk(KERN_ERR "Architecture has no drm_cache.c support\n");
  96        WARN_ON_ONCE(1);
  97#endif
  98}
  99EXPORT_SYMBOL(drm_clflush_pages);
 100