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 <drm/drmP.h> 39 40 #if __OS_HAS_AGP 41 static void *agp_remap(unsigned long offset, unsigned long size, 42 struct drm_device * dev) 43 { 44 unsigned long i, num_pages = 45 PAGE_ALIGN(size) / PAGE_SIZE; 46 struct drm_agp_mem *agpmem; 47 struct page **page_map; 48 struct page **phys_page_map; 49 void *addr; 50 51 size = PAGE_ALIGN(size); 52 53 #ifdef __alpha__ 54 offset -= dev->hose->mem_space->start; 55 #endif 56 57 list_for_each_entry(agpmem, &dev->agp->memory, head) 58 if (agpmem->bound <= offset 59 && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >= 60 (offset + size)) 61 break; 62 if (&agpmem->head == &dev->agp->memory) 63 return NULL; 64 65 /* 66 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by 67 * the CPU do not get remapped by the GART. We fix this by using the kernel's 68 * page-table instead (that's probably faster anyhow...). 69 */ 70 /* note: use vmalloc() because num_pages could be large... */ 71 page_map = vmalloc(num_pages * sizeof(struct page *)); 72 if (!page_map) 73 return NULL; 74 75 phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE); 76 for (i = 0; i < num_pages; ++i) 77 page_map[i] = phys_page_map[i]; 78 addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP); 79 vfree(page_map); 80 81 return addr; 82 } 83 84 /** Wrapper around agp_free_memory() */ 85 void drm_free_agp(DRM_AGP_MEM * handle, int pages) 86 { 87 agp_free_memory(handle); 88 } 89 90 /** Wrapper around agp_bind_memory() */ 91 int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start) 92 { 93 return agp_bind_memory(handle, start); 94 } 95 96 /** Wrapper around agp_unbind_memory() */ 97 int drm_unbind_agp(DRM_AGP_MEM * handle) 98 { 99 return agp_unbind_memory(handle); 100 } 101 102 #else /* __OS_HAS_AGP */ 103 static inline void *agp_remap(unsigned long offset, unsigned long size, 104 struct drm_device * dev) 105 { 106 return NULL; 107 } 108 109 #endif /* agp */ 110 111 void drm_core_ioremap(struct drm_local_map *map, struct drm_device *dev) 112 { 113 if (drm_core_has_AGP(dev) && 114 dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) 115 map->handle = agp_remap(map->offset, map->size, dev); 116 else 117 map->handle = ioremap(map->offset, map->size); 118 } 119 EXPORT_SYMBOL(drm_core_ioremap); 120 121 void drm_core_ioremap_wc(struct drm_local_map *map, struct drm_device *dev) 122 { 123 if (drm_core_has_AGP(dev) && 124 dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) 125 map->handle = agp_remap(map->offset, map->size, dev); 126 else 127 map->handle = ioremap_wc(map->offset, map->size); 128 } 129 EXPORT_SYMBOL(drm_core_ioremap_wc); 130 131 void drm_core_ioremapfree(struct drm_local_map *map, struct drm_device *dev) 132 { 133 if (!map->handle || !map->size) 134 return; 135 136 if (drm_core_has_AGP(dev) && 137 dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) 138 vunmap(map->handle); 139 else 140 iounmap(map->handle); 141 } 142 EXPORT_SYMBOL(drm_core_ioremapfree); 143