| /* drm_scatter.h -- IOCTLs to manage scatter/gather memory -*- linux-c -*- |
| * Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com */ |
| /*- |
| * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. |
| * All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the next |
| * paragraph) shall be included in all copies or substantial portions of the |
| * Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| * DEALINGS IN THE SOFTWARE. |
| * |
| * Authors: |
| * Gareth Hughes <gareth@valinux.com> |
| * Eric Anholt <anholt@FreeBSD.org> |
| * |
| */ |
| |
| #include "drmP.h" |
| |
| #define DEBUG_SCATTER 0 |
| |
| void drm_sg_cleanup(drm_sg_mem_t *entry) |
| { |
| free((void *)entry->handle, M_DRM); |
| free(entry->busaddr, M_DRM); |
| free(entry, M_DRM); |
| } |
| |
| int drm_sg_alloc(DRM_IOCTL_ARGS) |
| { |
| DRM_DEVICE; |
| drm_scatter_gather_t request; |
| drm_sg_mem_t *entry; |
| unsigned long pages; |
| int i; |
| |
| DRM_DEBUG( "%s\n", __FUNCTION__ ); |
| |
| if ( dev->sg ) |
| return EINVAL; |
| |
| DRM_COPY_FROM_USER_IOCTL(request, (drm_scatter_gather_t *)data, |
| sizeof(request) ); |
| |
| entry = malloc(sizeof(*entry), M_DRM, M_WAITOK | M_ZERO); |
| if ( !entry ) |
| return ENOMEM; |
| |
| pages = round_page(request.size) / PAGE_SIZE; |
| DRM_DEBUG( "sg size=%ld pages=%ld\n", request.size, pages ); |
| |
| entry->pages = pages; |
| |
| entry->busaddr = malloc(pages * sizeof(*entry->busaddr), M_DRM, |
| M_WAITOK | M_ZERO); |
| if ( !entry->busaddr ) { |
| drm_sg_cleanup(entry); |
| return ENOMEM; |
| } |
| |
| entry->handle = (long)malloc(pages << PAGE_SHIFT, M_DRM, |
| M_WAITOK | M_ZERO); |
| if (entry->handle == 0) { |
| drm_sg_cleanup(entry); |
| return ENOMEM; |
| } |
| |
| for (i = 0; i < pages; i++) { |
| entry->busaddr[i] = vtophys(entry->handle + i * PAGE_SIZE); |
| } |
| |
| DRM_DEBUG( "sg alloc handle = %08lx\n", entry->handle ); |
| |
| entry->virtual = (void *)entry->handle; |
| request.handle = entry->handle; |
| |
| DRM_COPY_TO_USER_IOCTL( (drm_scatter_gather_t *)data, |
| request, |
| sizeof(request) ); |
| |
| DRM_LOCK(); |
| if (dev->sg) { |
| DRM_UNLOCK(); |
| drm_sg_cleanup(entry); |
| return EINVAL; |
| } |
| dev->sg = entry; |
| DRM_UNLOCK(); |
| |
| return 0; |
| } |
| |
| int drm_sg_free(DRM_IOCTL_ARGS) |
| { |
| DRM_DEVICE; |
| drm_scatter_gather_t request; |
| drm_sg_mem_t *entry; |
| |
| DRM_COPY_FROM_USER_IOCTL( request, (drm_scatter_gather_t *)data, |
| sizeof(request) ); |
| |
| DRM_LOCK(); |
| entry = dev->sg; |
| dev->sg = NULL; |
| DRM_UNLOCK(); |
| |
| if ( !entry || entry->handle != request.handle ) |
| return EINVAL; |
| |
| DRM_DEBUG( "sg free virtual = 0x%lx\n", entry->handle ); |
| |
| drm_sg_cleanup(entry); |
| |
| return 0; |
| } |