3 * IOCTLs to manage scatter/gather memory
5 * \author Gareth Hughes <gareth@valinux.com>
9 * Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com
11 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
12 * All Rights Reserved.
14 * Permission is hereby granted, free of charge, to any person obtaining a
15 * copy of this software and associated documentation files (the "Software"),
16 * to deal in the Software without restriction, including without limitation
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19 * Software is furnished to do so, subject to the following conditions:
21 * The above copyright notice and this permission notice (including the next
22 * paragraph) shall be included in all copies or substantial portions of the
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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31 * DEALINGS IN THE SOFTWARE.
34 #include <linux/config.h>
35 #include <linux/vmalloc.h>
38 #define DEBUG_SCATTER 0
40 void drm_sg_cleanup( drm_sg_mem_t
*entry
)
45 for ( i
= 0 ; i
< entry
->pages
; i
++ ) {
46 page
= entry
->pagelist
[i
];
48 ClearPageReserved( page
);
51 vfree( entry
->virtual );
53 drm_free( entry
->busaddr
,
54 entry
->pages
* sizeof(*entry
->busaddr
),
56 drm_free( entry
->pagelist
,
57 entry
->pages
* sizeof(*entry
->pagelist
),
65 # define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1)))
67 # define ScatterHandle(x) (unsigned int)(x)
70 int drm_sg_alloc( struct inode
*inode
, struct file
*filp
,
71 unsigned int cmd
, unsigned long arg
)
73 drm_file_t
*priv
= filp
->private_data
;
74 drm_device_t
*dev
= priv
->head
->dev
;
75 drm_scatter_gather_t __user
*argp
= (void __user
*)arg
;
76 drm_scatter_gather_t request
;
78 unsigned long pages
, i
, j
;
80 DRM_DEBUG( "%s\n", __FUNCTION__
);
82 if (!drm_core_check_feature(dev
, DRIVER_SG
))
88 if ( copy_from_user( &request
, argp
, sizeof(request
) ) )
91 entry
= drm_alloc( sizeof(*entry
), DRM_MEM_SGLISTS
);
95 memset( entry
, 0, sizeof(*entry
) );
97 pages
= (request
.size
+ PAGE_SIZE
- 1) / PAGE_SIZE
;
98 DRM_DEBUG( "sg size=%ld pages=%ld\n", request
.size
, pages
);
100 entry
->pages
= pages
;
101 entry
->pagelist
= drm_alloc( pages
* sizeof(*entry
->pagelist
),
103 if ( !entry
->pagelist
) {
104 drm_free( entry
, sizeof(*entry
), DRM_MEM_SGLISTS
);
108 memset(entry
->pagelist
, 0, pages
* sizeof(*entry
->pagelist
));
110 entry
->busaddr
= drm_alloc( pages
* sizeof(*entry
->busaddr
),
112 if ( !entry
->busaddr
) {
113 drm_free( entry
->pagelist
,
114 entry
->pages
* sizeof(*entry
->pagelist
),
121 memset( (void *)entry
->busaddr
, 0, pages
* sizeof(*entry
->busaddr
) );
123 entry
->virtual = vmalloc_32( pages
<< PAGE_SHIFT
);
124 if ( !entry
->virtual ) {
125 drm_free( entry
->busaddr
,
126 entry
->pages
* sizeof(*entry
->busaddr
),
128 drm_free( entry
->pagelist
,
129 entry
->pages
* sizeof(*entry
->pagelist
),
137 /* This also forces the mapping of COW pages, so our page list
138 * will be valid. Please don't remove it...
140 memset( entry
->virtual, 0, pages
<< PAGE_SHIFT
);
142 entry
->handle
= ScatterHandle((unsigned long)entry
->virtual);
144 DRM_DEBUG( "sg alloc handle = %08lx\n", entry
->handle
);
145 DRM_DEBUG( "sg alloc virtual = %p\n", entry
->virtual );
147 for (i
= (unsigned long)entry
->virtual, j
= 0; j
< pages
;
148 i
+= PAGE_SIZE
, j
++) {
149 entry
->pagelist
[j
] = vmalloc_to_page((void *)i
);
150 if (!entry
->pagelist
[j
])
152 SetPageReserved(entry
->pagelist
[j
]);
155 request
.handle
= entry
->handle
;
157 if ( copy_to_user( argp
, &request
, sizeof(request
) ) ) {
158 drm_sg_cleanup( entry
);
165 /* Verify that each page points to its virtual address, and vice
171 for ( i
= 0 ; i
< pages
; i
++ ) {
174 tmp
= page_address( entry
->pagelist
[i
] );
176 j
< PAGE_SIZE
/ sizeof(unsigned long) ;
180 tmp
= (unsigned long *)((u8
*)entry
->virtual +
183 j
< PAGE_SIZE
/ sizeof(unsigned long) ;
185 if ( *tmp
!= 0xcafebabe && error
== 0 ) {
187 DRM_ERROR( "Scatter allocation error, "
188 "pagelist does not match "
189 "virtual mapping\n" );
192 tmp
= page_address( entry
->pagelist
[i
] );
194 j
< PAGE_SIZE
/ sizeof(unsigned long) ;
200 DRM_ERROR( "Scatter allocation matches pagelist\n" );
207 drm_sg_cleanup( entry
);
211 int drm_sg_free( struct inode
*inode
, struct file
*filp
,
212 unsigned int cmd
, unsigned long arg
)
214 drm_file_t
*priv
= filp
->private_data
;
215 drm_device_t
*dev
= priv
->head
->dev
;
216 drm_scatter_gather_t request
;
219 if (!drm_core_check_feature(dev
, DRIVER_SG
))
222 if ( copy_from_user( &request
,
223 (drm_scatter_gather_t __user
*)arg
,
230 if ( !entry
|| entry
->handle
!= request
.handle
)
233 DRM_DEBUG( "sg free virtual = %p\n", entry
->virtual );
235 drm_sg_cleanup( entry
);