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freebsd/sys/dev/drm2/drm_vm.c
Konstantin Belousov e27f871969 Add the code for new Intel GPU driver, which supports GEM, KMS and
works with new generations of GPUs (IronLake, SandyBridge and
supposedly IvyBridge).

The driver is not connected to the build yet.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2012-05-22 11:07:44 +00:00

135 lines
3.8 KiB
C

/*-
* Copyright 2003 Eric Anholt
* 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
* ERIC ANHOLT 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>
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 succesful 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;
}