diff options
Diffstat (limited to 'sys/dev/drm/drm_scatter.c')
-rw-r--r-- | sys/dev/drm/drm_scatter.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/sys/dev/drm/drm_scatter.c b/sys/dev/drm/drm_scatter.c new file mode 100644 index 0000000..fe8bb4b --- /dev/null +++ b/sys/dev/drm/drm_scatter.c @@ -0,0 +1,126 @@ +/* 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> + * + * $FreeBSD$ + */ + +#include "dev/drm/drmP.h" + +#define DEBUG_SCATTER 0 + +void drm_sg_cleanup(drm_sg_mem_t *entry) +{ + free(entry->virtual, 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; + + 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->virtual = malloc(pages << PAGE_SHIFT, M_DRM, M_WAITOK | M_ZERO); + if ( !entry->virtual ) { + drm_sg_cleanup(entry); + return ENOMEM; + } + + entry->handle = (unsigned long)entry->virtual; + + DRM_DEBUG( "sg alloc handle = %08lx\n", entry->handle ); + DRM_DEBUG( "sg alloc virtual = %p\n", entry->virtual ); + + 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 = %p\n", entry->virtual ); + + drm_sg_cleanup(entry); + + return 0; +} |