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drm_memory.c revision 1.1.1.1.8.2 
      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(DRM_AGP_MEM * handle, int pages)
     86 {
     87 	agp_free_memory(handle);
     88 }
     89 EXPORT_SYMBOL(drm_free_agp);
     90 
     91 /** Wrapper around agp_bind_memory() */
     92 int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start)
     93 {
     94 	return agp_bind_memory(handle, start);
     95 }
     96 
     97 /** Wrapper around agp_unbind_memory() */
     98 int drm_unbind_agp(DRM_AGP_MEM * handle)
     99 {
    100 	return agp_unbind_memory(handle);
    101 }
    102 EXPORT_SYMBOL(drm_unbind_agp);
    103 
    104 #else  /*  __OS_HAS_AGP  */
    105 static inline void *agp_remap(unsigned long offset, unsigned long size,
    106 			      struct drm_device * dev)
    107 {
    108 	return NULL;
    109 }
    110 
    111 #endif				/* agp */
    112 
    113 void drm_core_ioremap(struct drm_local_map *map, struct drm_device *dev)
    114 {
    115 	if (drm_core_has_AGP(dev) &&
    116 	    dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
    117 		map->handle = agp_remap(map->offset, map->size, dev);
    118 	else
    119 		map->handle = ioremap(map->offset, map->size);
    120 }
    121 EXPORT_SYMBOL(drm_core_ioremap);
    122 
    123 void drm_core_ioremap_wc(struct drm_local_map *map, struct drm_device *dev)
    124 {
    125 	if (drm_core_has_AGP(dev) &&
    126 	    dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
    127 		map->handle = agp_remap(map->offset, map->size, dev);
    128 	else
    129 		map->handle = ioremap_wc(map->offset, map->size);
    130 }
    131 EXPORT_SYMBOL(drm_core_ioremap_wc);
    132 
    133 void drm_core_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
    134 {
    135 	if (!map->handle || !map->size)
    136 		return;
    137 
    138 	if (drm_core_has_AGP(dev) &&
    139 	    dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
    140 		vunmap(map->handle);
    141 	else
    142 		iounmap(map->handle);
    143 }
    144 EXPORT_SYMBOL(drm_core_ioremapfree);
    145