1 /* $NetBSD: drm_memory.c,v 1.2 2018/08/27 04:58:19 riastradh Exp $ */ 2 3 /** 4 * \file drm_memory.c 5 * Memory management wrappers for DRM 6 * 7 * \author Rickard E. (Rik) Faith <faith@valinux.com> 8 * \author Gareth Hughes <gareth@valinux.com> 9 */ 10 11 /* 12 * Created: Thu Feb 4 14:00:34 1999 by faith@valinux.com 13 * 14 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. 15 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 16 * All Rights Reserved. 17 * 18 * Permission is hereby granted, free of charge, to any person obtaining a 19 * copy of this software and associated documentation files (the "Software"), 20 * to deal in the Software without restriction, including without limitation 21 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 22 * and/or sell copies of the Software, and to permit persons to whom the 23 * Software is furnished to do so, subject to the following conditions: 24 * 25 * The above copyright notice and this permission notice (including the next 26 * paragraph) shall be included in all copies or substantial portions of the 27 * Software. 28 * 29 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 30 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 31 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 32 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 33 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 34 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 35 * OTHER DEALINGS IN THE SOFTWARE. 36 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: drm_memory.c,v 1.2 2018/08/27 04:58:19 riastradh Exp $"); 40 41 #include <linux/highmem.h> 42 #include <linux/export.h> 43 #include <drm/drmP.h> 44 #include "drm_legacy.h" 45 46 #if IS_ENABLED(CONFIG_AGP) 47 48 #ifdef HAVE_PAGE_AGP 49 # include <asm/agp.h> 50 #else 51 # ifdef __powerpc__ 52 # define PAGE_AGP __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE) 53 # else 54 # define PAGE_AGP PAGE_KERNEL 55 # endif 56 #endif 57 58 static void *agp_remap(unsigned long offset, unsigned long size, 59 struct drm_device * dev) 60 { 61 unsigned long i, num_pages = 62 PAGE_ALIGN(size) / PAGE_SIZE; 63 struct drm_agp_mem *agpmem; 64 struct page **page_map; 65 struct page **phys_page_map; 66 void *addr; 67 68 size = PAGE_ALIGN(size); 69 70 #ifdef __alpha__ 71 offset -= dev->hose->mem_space->start; 72 #endif 73 74 list_for_each_entry(agpmem, &dev->agp->memory, head) 75 if (agpmem->bound <= offset 76 && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >= 77 (offset + size)) 78 break; 79 if (&agpmem->head == &dev->agp->memory) 80 return NULL; 81 82 /* 83 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by 84 * the CPU do not get remapped by the GART. We fix this by using the kernel's 85 * page-table instead (that's probably faster anyhow...). 86 */ 87 /* note: use vmalloc() because num_pages could be large... */ 88 page_map = vmalloc(num_pages * sizeof(struct page *)); 89 if (!page_map) 90 return NULL; 91 92 phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE); 93 for (i = 0; i < num_pages; ++i) 94 page_map[i] = phys_page_map[i]; 95 addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP); 96 vfree(page_map); 97 98 return addr; 99 } 100 101 /** Wrapper around agp_free_memory() */ 102 void drm_free_agp(struct agp_memory * handle, int pages) 103 { 104 agp_free_memory(handle); 105 } 106 107 /** Wrapper around agp_bind_memory() */ 108 int drm_bind_agp(struct agp_memory * handle, unsigned int start) 109 { 110 return agp_bind_memory(handle, start); 111 } 112 113 /** Wrapper around agp_unbind_memory() */ 114 int drm_unbind_agp(struct agp_memory * handle) 115 { 116 return agp_unbind_memory(handle); 117 } 118 119 #else /* CONFIG_AGP */ 120 static inline void *agp_remap(unsigned long offset, unsigned long size, 121 struct drm_device * dev) 122 { 123 return NULL; 124 } 125 126 #endif /* CONFIG_AGP */ 127 128 void drm_legacy_ioremap(struct drm_local_map *map, struct drm_device *dev) 129 { 130 if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) 131 map->handle = agp_remap(map->offset, map->size, dev); 132 else 133 map->handle = ioremap(map->offset, map->size); 134 } 135 EXPORT_SYMBOL(drm_legacy_ioremap); 136 137 void drm_legacy_ioremap_wc(struct drm_local_map *map, struct drm_device *dev) 138 { 139 if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) 140 map->handle = agp_remap(map->offset, map->size, dev); 141 else 142 map->handle = ioremap_wc(map->offset, map->size); 143 } 144 EXPORT_SYMBOL(drm_legacy_ioremap_wc); 145 146 void drm_legacy_ioremapfree(struct drm_local_map *map, struct drm_device *dev) 147 { 148 if (!map->handle || !map->size) 149 return; 150 151 if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) 152 vunmap(map->handle); 153 else 154 iounmap(map->handle); 155 } 156 EXPORT_SYMBOL(drm_legacy_ioremapfree); 157