Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 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 | |
Paul Gortmaker | 2d1a8a4 | 2011-08-30 18:16:33 -0400 | [diff] [blame] | 31 | #include <linux/export.h> |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 32 | #include "drmP.h" |
| 33 | |
| 34 | #if defined(CONFIG_X86) |
| 35 | static void |
| 36 | drm_clflush_page(struct page *page) |
| 37 | { |
| 38 | uint8_t *page_virtual; |
| 39 | unsigned int i; |
| 40 | |
| 41 | if (unlikely(page == NULL)) |
| 42 | return; |
| 43 | |
| 44 | page_virtual = kmap_atomic(page, KM_USER0); |
| 45 | for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size) |
| 46 | clflush(page_virtual + i); |
| 47 | kunmap_atomic(page_virtual, KM_USER0); |
| 48 | } |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 49 | |
Dave Airlie | c9c97b8 | 2009-08-27 09:53:47 +1000 | [diff] [blame] | 50 | static void drm_cache_flush_clflush(struct page *pages[], |
| 51 | unsigned long num_pages) |
| 52 | { |
| 53 | unsigned long i; |
| 54 | |
| 55 | mb(); |
| 56 | for (i = 0; i < num_pages; i++) |
| 57 | drm_clflush_page(*pages++); |
| 58 | mb(); |
| 59 | } |
| 60 | |
| 61 | static void |
| 62 | drm_clflush_ipi_handler(void *null) |
| 63 | { |
| 64 | wbinvd(); |
| 65 | } |
Dave Airlie | c9c97b8 | 2009-08-27 09:53:47 +1000 | [diff] [blame] | 66 | #endif |
Dave Airlie | ed017d9 | 2009-09-02 09:41:13 +1000 | [diff] [blame] | 67 | |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 68 | void |
| 69 | drm_clflush_pages(struct page *pages[], unsigned long num_pages) |
| 70 | { |
| 71 | |
| 72 | #if defined(CONFIG_X86) |
| 73 | if (cpu_has_clflush) { |
Dave Airlie | c9c97b8 | 2009-08-27 09:53:47 +1000 | [diff] [blame] | 74 | drm_cache_flush_clflush(pages, num_pages); |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 75 | return; |
| 76 | } |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 77 | |
Dave Airlie | c9c97b8 | 2009-08-27 09:53:47 +1000 | [diff] [blame] | 78 | if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0) |
| 79 | printk(KERN_ERR "Timed out waiting for cache flush.\n"); |
| 80 | |
| 81 | #elif defined(__powerpc__) |
| 82 | unsigned long i; |
| 83 | for (i = 0; i < num_pages; i++) { |
| 84 | struct page *page = pages[i]; |
| 85 | void *page_virtual; |
| 86 | |
| 87 | if (unlikely(page == NULL)) |
| 88 | continue; |
| 89 | |
| 90 | page_virtual = kmap_atomic(page, KM_USER0); |
| 91 | flush_dcache_range((unsigned long)page_virtual, |
| 92 | (unsigned long)page_virtual + PAGE_SIZE); |
| 93 | kunmap_atomic(page_virtual, KM_USER0); |
| 94 | } |
| 95 | #else |
Dave Airlie | ed017d9 | 2009-09-02 09:41:13 +1000 | [diff] [blame] | 96 | printk(KERN_ERR "Architecture has no drm_cache.c support\n"); |
| 97 | WARN_ON_ONCE(1); |
Dave Airlie | e0f0754 | 2008-10-07 13:41:49 +1000 | [diff] [blame] | 98 | #endif |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 99 | } |
| 100 | EXPORT_SYMBOL(drm_clflush_pages); |