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
118 lines
3.2 KiB
C
118 lines
3.2 KiB
C
/**************************************************************************
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*
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* Copyright 2008-2009 VMware, Inc., Palo Alto, CA., USA
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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
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the 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 NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/*
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* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <dev/drm2/drmP.h>
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#include <dev/drm2/drm_global.h>
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MALLOC_DEFINE(M_DRM_GLOBAL, "drm_global", "DRM Global Items");
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struct drm_global_item {
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struct sx mutex;
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void *object;
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int refcount;
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};
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static struct drm_global_item glob[DRM_GLOBAL_NUM];
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void drm_global_init(void)
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{
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int i;
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for (i = 0; i < DRM_GLOBAL_NUM; ++i) {
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struct drm_global_item *item = &glob[i];
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sx_init(&item->mutex, "drmgi");
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item->object = NULL;
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item->refcount = 0;
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}
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}
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void drm_global_release(void)
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{
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int i;
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for (i = 0; i < DRM_GLOBAL_NUM; ++i) {
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struct drm_global_item *item = &glob[i];
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MPASS(item->object == NULL);
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MPASS(item->refcount == 0);
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sx_destroy(&item->mutex);
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}
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}
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int drm_global_item_ref(struct drm_global_reference *ref)
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{
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int ret;
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struct drm_global_item *item = &glob[ref->global_type];
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void *object;
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sx_xlock(&item->mutex);
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if (item->refcount == 0) {
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item->object = malloc(ref->size, M_DRM_GLOBAL,
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M_NOWAIT | M_ZERO);
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if (unlikely(item->object == NULL)) {
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ret = -ENOMEM;
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goto out_err;
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}
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ref->object = item->object;
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ret = ref->init(ref);
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if (unlikely(ret != 0))
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goto out_err;
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}
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++item->refcount;
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ref->object = item->object;
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object = item->object;
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sx_xunlock(&item->mutex);
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return 0;
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out_err:
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sx_xunlock(&item->mutex);
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item->object = NULL;
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return ret;
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}
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EXPORT_SYMBOL(drm_global_item_ref);
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void drm_global_item_unref(struct drm_global_reference *ref)
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{
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struct drm_global_item *item = &glob[ref->global_type];
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sx_xlock(&item->mutex);
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MPASS(item->refcount != 0);
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MPASS(ref->object == item->object);
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if (--item->refcount == 0) {
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ref->release(ref);
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free(item->object, M_DRM_GLOBAL);
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item->object = NULL;
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}
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sx_xunlock(&item->mutex);
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}
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EXPORT_SYMBOL(drm_global_item_unref);
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