| 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); |