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 "drmP.h" 38 39 #ifdef DEBUG_MEMORY 40 #include "drm_memory_debug.h" 41 #else 42 43 /** No-op. */ 44 void drm_mem_init(void) 45 { 46 } 47 48 /** 49 * Called when "/proc/dri/%dev%/mem" is read. 50 * 51 * \param buf output buffer. 52 * \param start start of output data. 53 * \param offset requested start offset. 54 * \param len requested number of bytes. 55 * \param eof whether there is no more data to return. 56 * \param data private data. 57 * \return number of written bytes. 58 * 59 * No-op. 60 */ 61 int drm_mem_info(char *buf, char **start, off_t offset, 62 int len, int *eof, void *data) 63 { 64 return 0; 65 } 66 67 /** Wrapper around kmalloc() and kfree() */ 68 void *drm_realloc(void *oldpt, size_t oldsize, size_t size, int area) 69 { 70 void *pt; 71 72 if (!(pt = kmalloc(size, GFP_KERNEL))) 73 return NULL; 74 if (oldpt && oldsize) { 75 memcpy(pt, oldpt, oldsize); 76 kfree(oldpt); 77 } 78 return pt; 79 } 80 81 #if __OS_HAS_AGP 82 static void *agp_remap(unsigned long offset, unsigned long size, 83 struct drm_device * dev) 84 { 85 unsigned long *phys_addr_map, i, num_pages = 86 PAGE_ALIGN(size) / PAGE_SIZE; 87 struct drm_agp_mem *agpmem; 88 struct page **page_map; 89 void *addr; 90 91 size = PAGE_ALIGN(size); 92 93 #ifdef __alpha__ 94 offset -= dev->hose->mem_space->start; 95 #endif 96 97 list_for_each_entry(agpmem, &dev->agp->memory, head) 98 if (agpmem->bound <= offset 99 && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >= 100 (offset + size)) 101 break; 102 if (!agpmem) 103 return NULL; 104 105 /* 106 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by 107 * the CPU do not get remapped by the GART. We fix this by using the kernel's 108 * page-table instead (that's probably faster anyhow...). 109 */ 110 /* note: use vmalloc() because num_pages could be large... */ 111 page_map = vmalloc(num_pages * sizeof(struct page *)); 112 if (!page_map) 113 return NULL; 114 115 phys_addr_map = 116 agpmem->memory->memory + (offset - agpmem->bound) / PAGE_SIZE; 117 for (i = 0; i < num_pages; ++i) 118 page_map[i] = pfn_to_page(phys_addr_map[i] >> PAGE_SHIFT); 119 addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP); 120 vfree(page_map); 121 122 return addr; 123 } 124 125 /** Wrapper around agp_allocate_memory() */ 126 DRM_AGP_MEM *drm_alloc_agp(struct drm_device * dev, int pages, u32 type) 127 { 128 return drm_agp_allocate_memory(dev->agp->bridge, pages, type); 129 } 130 131 /** Wrapper around agp_free_memory() */ 132 int drm_free_agp(DRM_AGP_MEM * handle, int pages) 133 { 134 return drm_agp_free_memory(handle) ? 0 : -EINVAL; 135 } 136 EXPORT_SYMBOL(drm_free_agp); 137 138 /** Wrapper around agp_bind_memory() */ 139 int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start) 140 { 141 return drm_agp_bind_memory(handle, start); 142 } 143 144 /** Wrapper around agp_unbind_memory() */ 145 int drm_unbind_agp(DRM_AGP_MEM * handle) 146 { 147 return drm_agp_unbind_memory(handle); 148 } 149 EXPORT_SYMBOL(drm_unbind_agp); 150 151 #else /* __OS_HAS_AGP */ 152 static inline void *agp_remap(unsigned long offset, unsigned long size, 153 struct drm_device * dev) 154 { 155 return NULL; 156 } 157 158 #endif /* agp */ 159 160 #endif /* debug_memory */ 161 162 void drm_core_ioremap(struct drm_map *map, struct drm_device *dev) 163 { 164 if (drm_core_has_AGP(dev) && 165 dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) 166 map->handle = agp_remap(map->offset, map->size, dev); 167 else 168 map->handle = ioremap(map->offset, map->size); 169 } 170 EXPORT_SYMBOL(drm_core_ioremap); 171 172 void drm_core_ioremap_wc(struct drm_map *map, struct drm_device *dev) 173 { 174 map->handle = ioremap_wc(map->offset, map->size); 175 } 176 EXPORT_SYMBOL(drm_core_ioremap_wc); 177 void drm_core_ioremapfree(struct drm_map *map, struct drm_device *dev) 178 { 179 if (!map->handle || !map->size) 180 return; 181 182 if (drm_core_has_AGP(dev) && 183 dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) 184 vunmap(map->handle); 185 else 186 iounmap(map->handle); 187 } 188 EXPORT_SYMBOL(drm_core_ioremapfree); 189