592ffb2175
Revert r338177, r338176, r338175, r338174, r338172 After long consultations with re@, core members and mmacy, revert these changes. Followup changes will be made to mark them as deprecated and prent a message about where to find the up-to-date driver. Followup commits will be made to make this clear in the installer. Followup commits to reduce POLA in ways we're still exploring. It's anticipated that after the freeze, this will be removed in 13-current (with the residual of the drm2 code copied to sys/arm/dev/drm2 for the TEGRA port's use w/o the intel or radeon drivers). Due to the impending freeze, there was no formal core vote for this. I've been talking to different core members all day, as well as Matt Macey and Glen Barber. Nobody is completely happy, all are grudgingly going along with this. Work is in progress to mitigate the negative effects as much as possible. Requested by: re@ (gjb, rgrimes)
148 lines
4.2 KiB
C
148 lines
4.2 KiB
C
/**
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* \file drm_vm.c
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* Memory mapping for DRM
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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* \author Gareth Hughes <gareth@valinux.com>
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*/
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/*
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* Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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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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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* 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/drm2/drmP.h>
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#include <dev/drm2/drm.h>
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#ifdef FREEBSD_NOTYET
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int
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drm_mmap(struct cdev *kdev, vm_ooffset_t offset, vm_paddr_t *paddr,
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int prot, vm_memattr_t *memattr)
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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 successful 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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DRM_DEBUG("called with offset %016jx\n", offset);
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if (dev->dma && 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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*/
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DRM_LOCK(dev);
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TAILQ_FOREACH(map, &dev->maplist, link) {
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if (offset >> DRM_MAP_HANDLE_SHIFT ==
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(unsigned long)map->handle >> DRM_MAP_HANDLE_SHIFT)
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break;
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}
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if (map == NULL) {
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DRM_DEBUG("Can't find map, request offset = %016jx\n", offset);
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TAILQ_FOREACH(map, &dev->maplist, link) {
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DRM_DEBUG("map offset = %016lx, handle = %016lx\n",
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map->offset, (unsigned long)map->handle);
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}
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DRM_UNLOCK(dev);
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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(dev);
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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(dev);
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offset = offset & ((1ULL << DRM_MAP_HANDLE_SHIFT) - 1);
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switch (type) {
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case _DRM_FRAME_BUFFER:
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case _DRM_AGP:
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*memattr = VM_MEMATTR_WRITE_COMBINING;
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/* FALLTHROUGH */
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case _DRM_REGISTERS:
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phys = map->offset + offset;
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break;
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case _DRM_SCATTER_GATHER:
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*memattr = VM_MEMATTR_WRITE_COMBINING;
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/* FALLTHROUGH */
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case _DRM_CONSISTENT:
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case _DRM_SHM:
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phys = vtophys((char *)map->virtual + 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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#endif /* FREEBSD_NOTYET */
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