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>
34 #define DEBUG_SCATTER 0
36 void drm_sg_cleanup(drm_sg_mem_t *entry)
38 free((void *)entry->handle, M_DRM);
39 free(entry->busaddr, M_DRM);
43 int drm_sg_alloc(drm_device_t * dev, drm_scatter_gather_t * request)
52 entry = malloc(sizeof(*entry), M_DRM, M_WAITOK | M_ZERO);
56 pages = round_page(request->size) / PAGE_SIZE;
57 DRM_DEBUG( "sg size=%ld pages=%ld\n", request->size, pages );
61 entry->busaddr = malloc(pages * sizeof(*entry->busaddr), M_DRM,
63 if ( !entry->busaddr ) {
64 drm_sg_cleanup(entry);
68 entry->handle = (long)malloc(pages << PAGE_SHIFT, M_DRM,
70 if (entry->handle == 0) {
71 drm_sg_cleanup(entry);
75 for (i = 0; i < pages; i++) {
76 entry->busaddr[i] = vtophys(entry->handle + i * PAGE_SIZE);
79 DRM_DEBUG( "sg alloc handle = %08lx\n", entry->handle );
81 entry->virtual = (void *)entry->handle;
82 request->handle = entry->handle;
87 drm_sg_cleanup(entry);
96 int drm_sg_alloc_ioctl(drm_device_t *dev, void *data, struct drm_file *file_priv)
98 drm_scatter_gather_t *request = data;
101 DRM_DEBUG( "%s\n", __FUNCTION__ );
103 ret = drm_sg_alloc(dev, request);
107 int drm_sg_free(drm_device_t *dev, void *data, struct drm_file *file_priv)
109 drm_scatter_gather_t *request = data;
117 if ( !entry || entry->handle != request->handle )
120 DRM_DEBUG( "sg free virtual = 0x%lx\n", entry->handle );
122 drm_sg_cleanup(entry);