455fa6518a
This update brings few features:
o Support for the setmaster/dropmaster ioctls. For instance, they
are used to run multiple X servers simultaneously.
o Support for minor devices. The only user-visible change is a new
entry in /dev/dri but it is useless at the moment. This is a
first step to support render nodes [1].
The main benefit is to greatly reduce the diff with Linux (at the
expense of an unreadable commit diff). Hopefully, next upgrades will be
easier.
No updates were made to the drivers, beside adapting them to API
changes.
[1] https://en.wikipedia.org/wiki/Direct_Rendering_Manager#Render_nodes
Tested by: Many people
MFC after: 1 month
Relnotes: yes
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 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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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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