Home | History | Annotate | Line # | Download | only in drm
drm_memory.c revision 1.1.1.2 
      1 /**
      2  * \file drm_memory.c
      3  * Memory management wrappers for DRM
      4  *
      5  * \author Rickard E. (Rik) Faith <faith (at) valinux.com>
      6  * \author Gareth Hughes <gareth (at) valinux.com>
      7  */
      8 
      9 /*
     10  * Created: Thu Feb  4 14:00:34 1999 by faith (at) 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(struct agp_memory * handle, int pages)
     86 {
     87 	agp_free_memory(handle);
     88 }
     89 
     90 /** Wrapper around agp_bind_memory() */
     91 int drm_bind_agp(struct agp_memory * 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(struct agp_memory * 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 (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
    114 		map->handle = agp_remap(map->offset, map->size, dev);
    115 	else
    116 		map->handle = ioremap(map->offset, map->size);
    117 }
    118 EXPORT_SYMBOL(drm_core_ioremap);
    119 
    120 void drm_core_ioremap_wc(struct drm_local_map *map, struct drm_device *dev)
    121 {
    122 	if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
    123 		map->handle = agp_remap(map->offset, map->size, dev);
    124 	else
    125 		map->handle = ioremap_wc(map->offset, map->size);
    126 }
    127 EXPORT_SYMBOL(drm_core_ioremap_wc);
    128 
    129 void drm_core_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
    130 {
    131 	if (!map->handle || !map->size)
    132 		return;
    133 
    134 	if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
    135 		vunmap(map->handle);
    136 	else
    137 		iounmap(map->handle);
    138 }
    139 EXPORT_SYMBOL(drm_core_ioremapfree);
    140