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