1 /* drm_scatter.h -- IOCTLs to manage scatter/gather memory -*- linux-c -*-
2 * Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com
4 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice (including the next
15 * paragraph) shall be included in all copies or substantial portions of the
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
22 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
23 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
24 * DEALINGS IN THE SOFTWARE.
27 * Gareth Hughes <gareth@valinux.com>
29 * $FreeBSD: src/sys/dev/drm/drm_scatter.h,v 1.4.2.1 2003/04/26 07:05:28 anholt Exp $
32 #include "dev/drm/drmP.h"
34 #define DEBUG_SCATTER 0
38 void DRM(sg_cleanup)( drm_sg_mem_t *entry )
40 free( entry->virtual, DRM(M_DRM) );
42 DRM(free)( entry->busaddr,
43 entry->pages * sizeof(*entry->busaddr),
50 int DRM(sg_alloc)( DRM_IOCTL_ARGS )
53 drm_scatter_gather_t request;
57 DRM_DEBUG( "%s\n", __FUNCTION__ );
62 DRM_COPY_FROM_USER_IOCTL(request, (drm_scatter_gather_t *)data,
65 entry = DRM(alloc)( sizeof(*entry), DRM_MEM_SGLISTS );
69 bzero( entry, sizeof(*entry) );
71 pages = round_page(request.size) / PAGE_SIZE;
72 DRM_DEBUG( "sg size=%ld pages=%ld\n", request.size, pages );
76 entry->busaddr = DRM(alloc)( pages * sizeof(*entry->busaddr),
78 if ( !entry->busaddr ) {
84 bzero( (void *)entry->busaddr, pages * sizeof(*entry->busaddr) );
86 entry->virtual = malloc( pages << PAGE_SHIFT, DRM(M_DRM), M_WAITOK );
87 if ( !entry->virtual ) {
88 DRM(free)( entry->busaddr,
89 entry->pages * sizeof(*entry->busaddr),
97 bzero( entry->virtual, pages << PAGE_SHIFT );
99 entry->handle = (unsigned long)entry->virtual;
101 DRM_DEBUG( "sg alloc handle = %08lx\n", entry->handle );
102 DRM_DEBUG( "sg alloc virtual = %p\n", entry->virtual );
104 request.handle = entry->handle;
106 DRM_COPY_TO_USER_IOCTL( (drm_scatter_gather_t *)data,
114 DRM(sg_cleanup)( entry );
118 int DRM(sg_free)( DRM_IOCTL_ARGS )
121 drm_scatter_gather_t request;
124 DRM_COPY_FROM_USER_IOCTL( request, (drm_scatter_gather_t *)data,
130 if ( !entry || entry->handle != request.handle )
133 DRM_DEBUG( "sg free virtual = %p\n", entry->virtual );
135 DRM(sg_cleanup)( entry );
140 #else /* __REALLY_HAVE_SG */
142 int DRM(sg_alloc)( DRM_IOCTL_ARGS )
144 return DRM_ERR(EINVAL);
146 int DRM(sg_free)( DRM_IOCTL_ARGS )
148 return DRM_ERR(EINVAL);