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/export.h> 37 #include <linux/highmem.h> 38 #include <linux/pci.h> 39 #include <linux/vmalloc.h> 40 41 #include <drm/drm_cache.h> 42 #include <drm/drm_device.h> 43 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_noncached_wc(PAGE_KERNEL) 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(array_size(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 #else /* CONFIG_AGP */ 102 static inline void *agp_remap(unsigned long offset, unsigned long size, 103 struct drm_device *dev) 104 { 105 return NULL; 106 } 107 108 #endif /* CONFIG_AGP */ 109 110 void drm_legacy_ioremap(struct drm_local_map *map, struct drm_device *dev) 111 { 112 if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) 113 map->handle = agp_remap(map->offset, map->size, dev); 114 else 115 map->handle = ioremap(map->offset, map->size); 116 } 117 EXPORT_SYMBOL(drm_legacy_ioremap); 118 119 void drm_legacy_ioremap_wc(struct drm_local_map *map, struct drm_device *dev) 120 { 121 if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) 122 map->handle = agp_remap(map->offset, map->size, dev); 123 else 124 map->handle = ioremap_wc(map->offset, map->size); 125 } 126 EXPORT_SYMBOL(drm_legacy_ioremap_wc); 127 128 void drm_legacy_ioremapfree(struct drm_local_map *map, struct drm_device *dev) 129 { 130 if (!map->handle || !map->size) 131 return; 132 133 if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) 134 vunmap(map->handle); 135 else 136 iounmap(map->handle); 137 } 138 EXPORT_SYMBOL(drm_legacy_ioremapfree); 139