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.
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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),
64 int DRM(sg_alloc)( struct inode *inode, struct file *filp,
65 unsigned int cmd, unsigned long arg )
67 drm_file_t *priv = filp->private_data;
68 drm_device_t *dev = priv->dev;
69 drm_scatter_gather_t __user *argp = (void __user *)arg;
70 drm_scatter_gather_t request;
72 unsigned long pages, i, j;
74 DRM_DEBUG( "%s\n", __FUNCTION__ );
79 if ( copy_from_user( &request, argp, sizeof(request) ) )
82 entry = DRM(alloc)( sizeof(*entry), DRM_MEM_SGLISTS );
86 memset( entry, 0, sizeof(*entry) );
88 pages = (request.size + PAGE_SIZE - 1) / PAGE_SIZE;
89 DRM_DEBUG( "sg size=%ld pages=%ld\n", request.size, pages );
92 entry->pagelist = DRM(alloc)( pages * sizeof(*entry->pagelist),
94 if ( !entry->pagelist ) {
95 DRM(free)( entry, sizeof(*entry), DRM_MEM_SGLISTS );
99 memset(entry->pagelist, 0, pages * sizeof(*entry->pagelist));
101 entry->busaddr = DRM(alloc)( pages * sizeof(*entry->busaddr),
103 if ( !entry->busaddr ) {
104 DRM(free)( entry->pagelist,
105 entry->pages * sizeof(*entry->pagelist),
112 memset( (void *)entry->busaddr, 0, pages * sizeof(*entry->busaddr) );
114 entry->virtual = vmalloc_32( pages << PAGE_SHIFT );
115 if ( !entry->virtual ) {
116 DRM(free)( entry->busaddr,
117 entry->pages * sizeof(*entry->busaddr),
119 DRM(free)( entry->pagelist,
120 entry->pages * sizeof(*entry->pagelist),
128 /* This also forces the mapping of COW pages, so our page list
129 * will be valid. Please don't remove it...
131 memset( entry->virtual, 0, pages << PAGE_SHIFT );
133 entry->handle = (unsigned long)entry->virtual;
135 DRM_DEBUG( "sg alloc handle = %08lx\n", entry->handle );
136 DRM_DEBUG( "sg alloc virtual = %p\n", entry->virtual );
138 for ( i = entry->handle, j = 0 ; j < pages ; i += PAGE_SIZE, j++ ) {
139 entry->pagelist[j] = vmalloc_to_page((void *)i);
140 if (!entry->pagelist[j])
142 SetPageReserved(entry->pagelist[j]);
145 request.handle = entry->handle;
147 if ( copy_to_user( argp, &request, sizeof(request) ) ) {
148 DRM(sg_cleanup)( entry );
155 /* Verify that each page points to its virtual address, and vice
161 for ( i = 0 ; i < pages ; i++ ) {
164 tmp = page_address( entry->pagelist[i] );
166 j < PAGE_SIZE / sizeof(unsigned long) ;
170 tmp = (unsigned long *)((u8 *)entry->virtual +
173 j < PAGE_SIZE / sizeof(unsigned long) ;
175 if ( *tmp != 0xcafebabe && error == 0 ) {
177 DRM_ERROR( "Scatter allocation error, "
178 "pagelist does not match "
179 "virtual mapping\n" );
182 tmp = page_address( entry->pagelist[i] );
184 j < PAGE_SIZE / sizeof(unsigned long) ;
190 DRM_ERROR( "Scatter allocation matches pagelist\n" );
197 DRM(sg_cleanup)( entry );
201 int DRM(sg_free)( struct inode *inode, struct file *filp,
202 unsigned int cmd, unsigned long arg )
204 drm_file_t *priv = filp->private_data;
205 drm_device_t *dev = priv->dev;
206 drm_scatter_gather_t request;
209 if ( copy_from_user( &request,
210 (drm_scatter_gather_t __user *)arg,
217 if ( !entry || entry->handle != request.handle )
220 DRM_DEBUG( "sg free virtual = %p\n", entry->virtual );
222 DRM(sg_cleanup)( entry );