148 lines
4.2 KiB
C
148 lines
4.2 KiB
C
/**
|
|
* \file drm_vm.c
|
|
* Memory mapping for DRM
|
|
*
|
|
* \author Rickard E. (Rik) Faith <faith@valinux.com>
|
|
* \author Gareth Hughes <gareth@valinux.com>
|
|
*/
|
|
|
|
/*
|
|
* Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
|
|
*
|
|
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
|
|
* 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
|
|
* VA LINUX SYSTEMS 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/** @file drm_vm.c
|
|
* Support code for mmaping of DRM maps.
|
|
*/
|
|
|
|
#include <dev/drm2/drmP.h>
|
|
#include <dev/drm2/drm.h>
|
|
|
|
#ifdef FREEBSD_NOTYET
|
|
int
|
|
drm_mmap(struct cdev *kdev, vm_ooffset_t offset, vm_paddr_t *paddr,
|
|
int prot, vm_memattr_t *memattr)
|
|
{
|
|
struct drm_device *dev = drm_get_device_from_kdev(kdev);
|
|
struct drm_file *file_priv = NULL;
|
|
drm_local_map_t *map;
|
|
enum drm_map_type type;
|
|
vm_paddr_t phys;
|
|
int error;
|
|
|
|
/* d_mmap gets called twice, we can only reference file_priv during
|
|
* the first call. We need to assume that if error is EBADF the
|
|
* call was successful and the client is authenticated.
|
|
*/
|
|
error = devfs_get_cdevpriv((void **)&file_priv);
|
|
if (error == ENOENT) {
|
|
DRM_ERROR("Could not find authenticator!\n");
|
|
return EINVAL;
|
|
}
|
|
|
|
if (file_priv && !file_priv->authenticated)
|
|
return EACCES;
|
|
|
|
DRM_DEBUG("called with offset %016jx\n", offset);
|
|
if (dev->dma && offset < ptoa(dev->dma->page_count)) {
|
|
drm_device_dma_t *dma = dev->dma;
|
|
|
|
DRM_SPINLOCK(&dev->dma_lock);
|
|
|
|
if (dma->pagelist != NULL) {
|
|
unsigned long page = offset >> PAGE_SHIFT;
|
|
unsigned long phys = dma->pagelist[page];
|
|
|
|
DRM_SPINUNLOCK(&dev->dma_lock);
|
|
*paddr = phys;
|
|
return 0;
|
|
} else {
|
|
DRM_SPINUNLOCK(&dev->dma_lock);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* A sequential search of a linked list is
|
|
fine here because: 1) there will only be
|
|
about 5-10 entries in the list and, 2) a
|
|
DRI client only has to do this mapping
|
|
once, so it doesn't have to be optimized
|
|
for performance, even if the list was a
|
|
bit longer.
|
|
*/
|
|
DRM_LOCK(dev);
|
|
TAILQ_FOREACH(map, &dev->maplist, link) {
|
|
if (offset >> DRM_MAP_HANDLE_SHIFT ==
|
|
(unsigned long)map->handle >> DRM_MAP_HANDLE_SHIFT)
|
|
break;
|
|
}
|
|
|
|
if (map == NULL) {
|
|
DRM_DEBUG("Can't find map, request offset = %016jx\n", offset);
|
|
TAILQ_FOREACH(map, &dev->maplist, link) {
|
|
DRM_DEBUG("map offset = %016lx, handle = %016lx\n",
|
|
map->offset, (unsigned long)map->handle);
|
|
}
|
|
DRM_UNLOCK(dev);
|
|
return -1;
|
|
}
|
|
if (((map->flags & _DRM_RESTRICTED) && !DRM_SUSER(DRM_CURPROC))) {
|
|
DRM_UNLOCK(dev);
|
|
DRM_DEBUG("restricted map\n");
|
|
return -1;
|
|
}
|
|
type = map->type;
|
|
DRM_UNLOCK(dev);
|
|
|
|
offset = offset & ((1ULL << DRM_MAP_HANDLE_SHIFT) - 1);
|
|
|
|
switch (type) {
|
|
case _DRM_FRAME_BUFFER:
|
|
case _DRM_AGP:
|
|
*memattr = VM_MEMATTR_WRITE_COMBINING;
|
|
/* FALLTHROUGH */
|
|
case _DRM_REGISTERS:
|
|
phys = map->offset + offset;
|
|
break;
|
|
case _DRM_SCATTER_GATHER:
|
|
*memattr = VM_MEMATTR_WRITE_COMBINING;
|
|
/* FALLTHROUGH */
|
|
case _DRM_CONSISTENT:
|
|
case _DRM_SHM:
|
|
phys = vtophys((char *)map->virtual + offset);
|
|
break;
|
|
default:
|
|
DRM_ERROR("bad map type %d\n", type);
|
|
return -1; /* This should never happen. */
|
|
}
|
|
|
|
*paddr = phys;
|
|
return 0;
|
|
}
|
|
#endif /* FREEBSD_NOTYET */
|