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/drivers/gpu/drm/drm_memory.c

https://bitbucket.org/cresqo/cm7-p500-kernel
C | 168 lines | 92 code | 20 blank | 56 comment | 20 complexity | 61e61792ea4fce27d25c1e4c7a46d5fc MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
  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 "drmP.h"
 38
 39/**
 40 * Called when "/proc/dri/%dev%/mem" is read.
 41 *
 42 * \param buf output buffer.
 43 * \param start start of output data.
 44 * \param offset requested start offset.
 45 * \param len requested number of bytes.
 46 * \param eof whether there is no more data to return.
 47 * \param data private data.
 48 * \return number of written bytes.
 49 *
 50 * No-op.
 51 */
 52int drm_mem_info(char *buf, char **start, off_t offset,
 53		 int len, int *eof, void *data)
 54{
 55	return 0;
 56}
 57
 58#if __OS_HAS_AGP
 59static void *agp_remap(unsigned long offset, unsigned long size,
 60		       struct drm_device * dev)
 61{
 62	unsigned long i, num_pages =
 63	    PAGE_ALIGN(size) / PAGE_SIZE;
 64	struct drm_agp_mem *agpmem;
 65	struct page **page_map;
 66	struct page **phys_page_map;
 67	void *addr;
 68
 69	size = PAGE_ALIGN(size);
 70
 71#ifdef __alpha__
 72	offset -= dev->hose->mem_space->start;
 73#endif
 74
 75	list_for_each_entry(agpmem, &dev->agp->memory, head)
 76		if (agpmem->bound <= offset
 77		    && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
 78		    (offset + size))
 79			break;
 80	if (&agpmem->head == &dev->agp->memory)
 81		return NULL;
 82
 83	/*
 84	 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
 85	 * the CPU do not get remapped by the GART.  We fix this by using the kernel's
 86	 * page-table instead (that's probably faster anyhow...).
 87	 */
 88	/* note: use vmalloc() because num_pages could be large... */
 89	page_map = vmalloc(num_pages * sizeof(struct page *));
 90	if (!page_map)
 91		return NULL;
 92
 93	phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE);
 94	for (i = 0; i < num_pages; ++i)
 95		page_map[i] = phys_page_map[i];
 96	addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
 97	vfree(page_map);
 98
 99	return addr;
100}
101
102/** Wrapper around agp_allocate_memory() */
103DRM_AGP_MEM *drm_alloc_agp(struct drm_device * dev, int pages, u32 type)
104{
105	return drm_agp_allocate_memory(dev->agp->bridge, pages, type);
106}
107
108/** Wrapper around agp_free_memory() */
109int drm_free_agp(DRM_AGP_MEM * handle, int pages)
110{
111	return drm_agp_free_memory(handle) ? 0 : -EINVAL;
112}
113EXPORT_SYMBOL(drm_free_agp);
114
115/** Wrapper around agp_bind_memory() */
116int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start)
117{
118	return drm_agp_bind_memory(handle, start);
119}
120
121/** Wrapper around agp_unbind_memory() */
122int drm_unbind_agp(DRM_AGP_MEM * handle)
123{
124	return drm_agp_unbind_memory(handle);
125}
126EXPORT_SYMBOL(drm_unbind_agp);
127
128#else  /*  __OS_HAS_AGP  */
129static inline void *agp_remap(unsigned long offset, unsigned long size,
130			      struct drm_device * dev)
131{
132	return NULL;
133}
134
135#endif				/* agp */
136
137void drm_core_ioremap(struct drm_local_map *map, struct drm_device *dev)
138{
139	if (drm_core_has_AGP(dev) &&
140	    dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
141		map->handle = agp_remap(map->offset, map->size, dev);
142	else
143		map->handle = ioremap(map->offset, map->size);
144}
145EXPORT_SYMBOL(drm_core_ioremap);
146
147void drm_core_ioremap_wc(struct drm_local_map *map, struct drm_device *dev)
148{
149	if (drm_core_has_AGP(dev) &&
150	    dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
151		map->handle = agp_remap(map->offset, map->size, dev);
152	else
153		map->handle = ioremap_wc(map->offset, map->size);
154}
155EXPORT_SYMBOL(drm_core_ioremap_wc);
156
157void drm_core_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
158{
159	if (!map->handle || !map->size)
160		return;
161
162	if (drm_core_has_AGP(dev) &&
163	    dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
164		vunmap(map->handle);
165	else
166		iounmap(map->handle);
167}
168EXPORT_SYMBOL(drm_core_ioremapfree);