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>
28 * Eric Anholt <anholt@FreeBSD.org>
33 #include "dev/drm/drmP.h"
35 #define DEBUG_SCATTER 0
37 void drm_sg_cleanup(drm_sg_mem_t *entry)
39 free(entry->virtual, M_DRM);
40 free(entry->busaddr, M_DRM);
44 int drm_sg_alloc(DRM_IOCTL_ARGS)
47 drm_scatter_gather_t request;
51 DRM_DEBUG( "%s\n", __FUNCTION__ );
56 DRM_COPY_FROM_USER_IOCTL(request, (drm_scatter_gather_t *)data,
59 entry = malloc(sizeof(*entry), M_DRM, M_WAITOK | M_ZERO);
63 pages = round_page(request.size) / PAGE_SIZE;
64 DRM_DEBUG( "sg size=%ld pages=%ld\n", request.size, pages );
68 entry->busaddr = malloc(pages * sizeof(*entry->busaddr), M_DRM,
70 if ( !entry->busaddr ) {
71 drm_sg_cleanup(entry);
75 entry->virtual = malloc(pages << PAGE_SHIFT, M_DRM, M_WAITOK | M_ZERO);
76 if ( !entry->virtual ) {
77 drm_sg_cleanup(entry);
81 entry->handle = (unsigned long)entry->virtual;
83 DRM_DEBUG( "sg alloc handle = %08lx\n", entry->handle );
84 DRM_DEBUG( "sg alloc virtual = %p\n", entry->virtual );
86 request.handle = entry->handle;
88 DRM_COPY_TO_USER_IOCTL( (drm_scatter_gather_t *)data,
95 drm_sg_cleanup(entry);
104 int drm_sg_free(DRM_IOCTL_ARGS)
107 drm_scatter_gather_t request;
110 DRM_COPY_FROM_USER_IOCTL( request, (drm_scatter_gather_t *)data,
118 if ( !entry || entry->handle != request.handle )
121 DRM_DEBUG( "sg free virtual = %p\n", entry->virtual );
123 drm_sg_cleanup(entry);