1 /** 2 * \file drm_memory.c 3 * Memory management wrappers for DRM 4 * 5 * \author Rickard E. (Rik) Faith <faith@valinux.com> 6 * \author Gareth Hughes <gareth@valinux.com> 7 */ 8 9 /* 10 * Created: Thu Feb 4 14:00:34 1999 by faith@valinux.com 11 * 12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. 13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 14 * All Rights Reserved. 15 * 16 * Permission is hereby granted, free of charge, to any person obtaining a 17 * copy of this software and associated documentation files (the "Software"), 18 * to deal in the Software without restriction, including without limitation 19 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 20 * and/or sell copies of the Software, and to permit persons to whom the 21 * Software is furnished to do so, subject to the following conditions: 22 * 23 * The above copyright notice and this permission notice (including the next 24 * paragraph) shall be included in all copies or substantial portions of the 25 * Software. 26 * 27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 33 * OTHER DEALINGS IN THE SOFTWARE. 34 */ 35 36 #include <linux/highmem.h> 37 #include <linux/export.h> 38 #include "drmP.h" 39 40 /** 41 * Called when "/proc/dri/%dev%/mem" is read. 42 * 43 * \param buf output buffer. 44 * \param start start of output data. 45 * \param offset requested start offset. 46 * \param len requested number of bytes. 47 * \param eof whether there is no more data to return. 48 * \param data private data. 49 * \return number of written bytes. 50 * 51 * No-op. 52 */ 53 int drm_mem_info(char *buf, char **start, off_t offset, 54 int len, int *eof, void *data) 55 { 56 return 0; 57 } 58 59 #if __OS_HAS_AGP 60 static void *agp_remap(unsigned long offset, unsigned long size, 61 struct drm_device * dev) 62 { 63 unsigned long i, num_pages = 64 PAGE_ALIGN(size) / PAGE_SIZE; 65 struct drm_agp_mem *agpmem; 66 struct page **page_map; 67 struct page **phys_page_map; 68 void *addr; 69 70 size = PAGE_ALIGN(size); 71 72 #ifdef __alpha__ 73 offset -= dev->hose->mem_space->start; 74 #endif 75 76 list_for_each_entry(agpmem, &dev->agp->memory, head) 77 if (agpmem->bound <= offset 78 && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >= 79 (offset + size)) 80 break; 81 if (&agpmem->head == &dev->agp->memory) 82 return NULL; 83 84 /* 85 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by 86 * the CPU do not get remapped by the GART. We fix this by using the kernel's 87 * page-table instead (that's probably faster anyhow...). 88 */ 89 /* note: use vmalloc() because num_pages could be large... */ 90 page_map = vmalloc(num_pages * sizeof(struct page *)); 91 if (!page_map) 92 return NULL; 93 94 phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE); 95 for (i = 0; i < num_pages; ++i) 96 page_map[i] = phys_page_map[i]; 97 addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP); 98 vfree(page_map); 99 100 return addr; 101 } 102 103 /** Wrapper around agp_free_memory() */ 104 void drm_free_agp(DRM_AGP_MEM * handle, int pages) 105 { 106 agp_free_memory(handle); 107 } 108 EXPORT_SYMBOL(drm_free_agp); 109 110 /** Wrapper around agp_bind_memory() */ 111 int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start) 112 { 113 return agp_bind_memory(handle, start); 114 } 115 116 /** Wrapper around agp_unbind_memory() */ 117 int drm_unbind_agp(DRM_AGP_MEM * handle) 118 { 119 return agp_unbind_memory(handle); 120 } 121 EXPORT_SYMBOL(drm_unbind_agp); 122 123 #else /* __OS_HAS_AGP */ 124 static inline void *agp_remap(unsigned long offset, unsigned long size, 125 struct drm_device * dev) 126 { 127 return NULL; 128 } 129 130 #endif /* agp */ 131 132 void drm_core_ioremap(struct drm_local_map *map, struct drm_device *dev) 133 { 134 if (drm_core_has_AGP(dev) && 135 dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) 136 map->handle = agp_remap(map->offset, map->size, dev); 137 else 138 map->handle = ioremap(map->offset, map->size); 139 } 140 EXPORT_SYMBOL(drm_core_ioremap); 141 142 void drm_core_ioremap_wc(struct drm_local_map *map, struct drm_device *dev) 143 { 144 if (drm_core_has_AGP(dev) && 145 dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) 146 map->handle = agp_remap(map->offset, map->size, dev); 147 else 148 map->handle = ioremap_wc(map->offset, map->size); 149 } 150 EXPORT_SYMBOL(drm_core_ioremap_wc); 151 152 void drm_core_ioremapfree(struct drm_local_map *map, struct drm_device *dev) 153 { 154 if (!map->handle || !map->size) 155 return; 156 157 if (drm_core_has_AGP(dev) && 158 dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) 159 vunmap(map->handle); 160 else 161 iounmap(map->handle); 162 } 163 EXPORT_SYMBOL(drm_core_ioremapfree); 164