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  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 <linux/export.h>
  32. #include <drm/drmP.h>
  33.  
  34. extern int x86_clflush_size;
  35.  
  36. static inline void clflush(volatile void *__p)
  37. {
  38.     asm volatile("clflush %0" : "+m" (*(volatile char*)__p));
  39. }
  40. #if 0
  41. static void
  42. drm_clflush_page(struct page *page)
  43. {
  44.         uint8_t *page_virtual;
  45.         unsigned int i;
  46.         const int size = boot_cpu_data.x86_clflush_size;
  47.  
  48.         if (unlikely(page == NULL))
  49.                 return;
  50.  
  51.         page_virtual = kmap_atomic(page);
  52.         for (i = 0; i < PAGE_SIZE; i += size)
  53.                 clflush(page_virtual + i);
  54.         kunmap_atomic(page_virtual);
  55. }
  56.  
  57. static void drm_cache_flush_clflush(struct page *pages[],
  58.                                     unsigned long num_pages)
  59. {
  60.         unsigned long i;
  61.  
  62.         mb();
  63.         for (i = 0; i < num_pages; i++)
  64.                 drm_clflush_page(*pages++);
  65.         mb();
  66. }
  67.  
  68. static void
  69. drm_clflush_ipi_handler(void *null)
  70. {
  71.         wbinvd();
  72. }
  73. #endif
  74.  
  75. void
  76. drm_clflush_pages(struct page *pages[], unsigned long num_pages)
  77. {
  78.     uint8_t *page_virtual;
  79.     unsigned int i, j;
  80.  
  81.     page_virtual = AllocKernelSpace(4096);
  82.  
  83.     if(page_virtual != NULL)
  84.     {
  85.         dma_addr_t *src, *dst;
  86.         u32 count;
  87.  
  88.         for (i = 0; i < num_pages; i++)
  89.         {
  90.             mb();
  91. //            asm volatile("mfence");
  92.  
  93.             MapPage(page_virtual,*pages++, 0x001);
  94.             for (j = 0; j < PAGE_SIZE; j += x86_clflush_size)
  95.                 clflush(page_virtual + j);
  96.             mb();
  97.         }
  98.         FreeKernelSpace(page_virtual);
  99.     }
  100.  
  101. }
  102. EXPORT_SYMBOL(drm_clflush_pages);
  103.  
  104. #if 0
  105. void
  106. drm_clflush_sg(struct sg_table *st)
  107. {
  108. #if defined(CONFIG_X86)
  109.         if (cpu_has_clflush) {
  110.                 struct sg_page_iter sg_iter;
  111.  
  112.                 mb();
  113.                 for_each_sg_page(st->sgl, &sg_iter, st->nents, 0)
  114.                         drm_clflush_page(sg_page_iter_page(&sg_iter));
  115.                 mb();
  116.  
  117.                 return;
  118.         }
  119.  
  120.         if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
  121.                 printk(KERN_ERR "Timed out waiting for cache flush.\n");
  122. #else
  123.         printk(KERN_ERR "Architecture has no drm_cache.c support\n");
  124.         WARN_ON_ONCE(1);
  125. #endif
  126. }
  127. EXPORT_SYMBOL(drm_clflush_sg);
  128.  
  129. void
  130. drm_clflush_virt_range(char *addr, unsigned long length)
  131. {
  132. #if defined(CONFIG_X86)
  133.         if (cpu_has_clflush) {
  134.                 char *end = addr + length;
  135.                 mb();
  136.                 for (; addr < end; addr += boot_cpu_data.x86_clflush_size)
  137.                         clflush(addr);
  138.                 clflush(end - 1);
  139.                 mb();
  140.                 return;
  141.         }
  142.  
  143.         if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
  144.                 printk(KERN_ERR "Timed out waiting for cache flush.\n");
  145. #else
  146.         printk(KERN_ERR "Architecture has no drm_cache.c support\n");
  147.         WARN_ON_ONCE(1);
  148. #endif
  149. }
  150. EXPORT_SYMBOL(drm_clflush_virt_range);
  151.  
  152. #endif
  153.