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 #include "drm_legacy.h" 40 41 #if IS_ENABLED(CONFIG_AGP) 42 43 #ifdef HAVE_PAGE_AGP 44 # include <asm/agp.h> 45 #else 46 # ifdef __powerpc__ 47 # define PAGE_AGP __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE) 48 # else 49 # define PAGE_AGP PAGE_KERNEL 50 # endif 51 #endif 52 53 static void *agp_remap(unsigned long offset, unsigned long size, 54 struct drm_device * dev) 55 { 56 unsigned long i, num_pages = 57 PAGE_ALIGN(size) / PAGE_SIZE; 58 struct drm_agp_mem *agpmem; 59 struct page **page_map; 60 struct page **phys_page_map; 61 void *addr; 62 63 size = PAGE_ALIGN(size); 64 65 #ifdef __alpha__ 66 offset -= dev->hose->mem_space->start; 67 #endif 68 69 list_for_each_entry(agpmem, &dev->agp->memory, head) 70 if (agpmem->bound <= offset 71 && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >= 72 (offset + size)) 73 break; 74 if (&agpmem->head == &dev->agp->memory) 75 return NULL; 76 77 /* 78 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by 79 * the CPU do not get remapped by the GART. We fix this by using the kernel's 80 * page-table instead (that's probably faster anyhow...). 81 */ 82 /* note: use vmalloc() because num_pages could be large... */ 83 page_map = vmalloc(num_pages * sizeof(struct page *)); 84 if (!page_map) 85 return NULL; 86 87 phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE); 88 for (i = 0; i < num_pages; ++i) 89 page_map[i] = phys_page_map[i]; 90 addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP); 91 vfree(page_map); 92 93 return addr; 94 } 95 96 /** Wrapper around agp_free_memory() */ 97 void drm_free_agp(struct agp_memory * handle, int pages) 98 { 99 agp_free_memory(handle); 100 } 101 102 /** Wrapper around agp_bind_memory() */ 103 int drm_bind_agp(struct agp_memory * handle, unsigned int start) 104 { 105 return agp_bind_memory(handle, start); 106 } 107 108 /** Wrapper around agp_unbind_memory() */ 109 int drm_unbind_agp(struct agp_memory * handle) 110 { 111 return agp_unbind_memory(handle); 112 } 113 114 #else /* CONFIG_AGP */ 115 static inline void *agp_remap(unsigned long offset, unsigned long size, 116 struct drm_device * dev) 117 { 118 return NULL; 119 } 120 121 #endif /* CONFIG_AGP */ 122 123 void drm_legacy_ioremap(struct drm_local_map *map, struct drm_device *dev) 124 { 125 if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) 126 map->handle = agp_remap(map->offset, map->size, dev); 127 else 128 map->handle = ioremap(map->offset, map->size); 129 } 130 EXPORT_SYMBOL(drm_legacy_ioremap); 131 132 void drm_legacy_ioremap_wc(struct drm_local_map *map, struct drm_device *dev) 133 { 134 if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) 135 map->handle = agp_remap(map->offset, map->size, dev); 136 else 137 map->handle = ioremap_wc(map->offset, map->size); 138 } 139 EXPORT_SYMBOL(drm_legacy_ioremap_wc); 140 141 void drm_legacy_ioremapfree(struct drm_local_map *map, struct drm_device *dev) 142 { 143 if (!map->handle || !map->size) 144 return; 145 146 if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) 147 vunmap(map->handle); 148 else 149 iounmap(map->handle); 150 } 151 EXPORT_SYMBOL(drm_legacy_ioremapfree); 152