117 lines
3.2 KiB
C
117 lines
3.2 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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/** @file drm_vm.c
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* Support code for mmaping of DRM maps.
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*/
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#include "drmP.h"
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#include "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;
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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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DRM_LOCK();
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TAILQ_FOREACH(file_priv, &dev->files, link)
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if (file_priv->pid == curthread->td_proc->p_pid &&
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file_priv->uid == curthread->td_ucred->cr_svuid &&
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file_priv->authenticated == 1)
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break;
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DRM_UNLOCK();
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if (!file_priv)
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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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