4cd2e9581f
This reverts a private patch which is causing issues with many Intel chipsets. I will review that patch and see what we need to do to fix it up later, but for the time being, we will just get these chips working again. This update contains a lot of code cleanup and is post gem merge (no, we don't have gem support). It should prove much easier to read the code now. A lot of thanks goes to vehemens for that work. I have adapted the code to use cdevpriv for tracking per open file data. That alleviates the old ugly hack that we used to try and accomplish the task and helped to clean up the open / close behavior a good bit. This also replaces the hack that was put in place a year or so ago to prevent radeons from locking up with AIGLX enabled. I have had a couple of radeon testers report that it still works as expected, though I no longer have radeon hardware to test with myself. Other various fixes from the linux crew and Intel, many of which are muddled in with the gem merge. Approved by: jhb (mentor) Obtained from: mesa/drm git master MFC after: 2 weeks
123 lines
3.4 KiB
C
123 lines
3.4 KiB
C
/*-
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* Copyright 2003 Eric Anholt
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* ERIC ANHOLT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/** @file drm_vm.c
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* Support code for mmaping of DRM maps.
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*/
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#include "dev/drm/drmP.h"
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#include "dev/drm/drm.h"
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int drm_mmap(struct cdev *kdev, vm_offset_t offset, vm_paddr_t *paddr,
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int prot)
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{
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struct drm_device *dev = drm_get_device_from_kdev(kdev);
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struct drm_file *file_priv = NULL;
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drm_local_map_t *map;
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enum drm_map_type type;
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vm_paddr_t phys;
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int error;
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/* d_mmap gets called twice, we can only reference file_priv during
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* the first call. We need to assume that if error is EBADF the
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* call was succesful and the client is authenticated.
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*/
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error = devfs_get_cdevpriv((void **)&file_priv);
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if (error == ENOENT) {
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DRM_ERROR("Could not find authenticator!\n");
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return EINVAL;
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}
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if (file_priv && !file_priv->authenticated)
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return EACCES;
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if (dev->dma && offset >= 0 && offset < ptoa(dev->dma->page_count)) {
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drm_device_dma_t *dma = dev->dma;
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DRM_SPINLOCK(&dev->dma_lock);
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if (dma->pagelist != NULL) {
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unsigned long page = offset >> PAGE_SHIFT;
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unsigned long phys = dma->pagelist[page];
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DRM_SPINUNLOCK(&dev->dma_lock);
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*paddr = phys;
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return 0;
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} else {
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DRM_SPINUNLOCK(&dev->dma_lock);
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return -1;
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}
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}
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/* A sequential search of a linked list is
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fine here because: 1) there will only be
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about 5-10 entries in the list and, 2) a
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DRI client only has to do this mapping
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once, so it doesn't have to be optimized
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for performance, even if the list was a
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bit longer. */
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DRM_LOCK();
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TAILQ_FOREACH(map, &dev->maplist, link) {
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if (offset >= map->offset && offset < map->offset + map->size)
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break;
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}
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if (map == NULL) {
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DRM_UNLOCK();
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DRM_DEBUG("can't find map\n");
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return -1;
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}
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if (((map->flags&_DRM_RESTRICTED) && !DRM_SUSER(DRM_CURPROC))) {
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DRM_UNLOCK();
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DRM_DEBUG("restricted map\n");
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return -1;
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}
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type = map->type;
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DRM_UNLOCK();
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switch (type) {
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case _DRM_FRAME_BUFFER:
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case _DRM_REGISTERS:
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case _DRM_AGP:
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phys = offset;
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break;
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case _DRM_CONSISTENT:
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phys = vtophys((char *)map->handle + (offset - map->offset));
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break;
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case _DRM_SCATTER_GATHER:
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case _DRM_SHM:
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phys = vtophys(offset);
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break;
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default:
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DRM_ERROR("bad map type %d\n", type);
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return -1; /* This should never happen. */
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}
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*paddr = phys;
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return 0;
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}
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