mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Dan Carpenter](/assets/img/avatar_default.png)
We moved the module options from drm_drv.c to drm_irq.c in 1888299571
('drm: Move vblank related module options into drm_irq.c'). Let's move
the MODULE_PARM_DESC()s as well so they're together.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160108110045.GF32195@mwanda
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
931 lines
24 KiB
C
931 lines
24 KiB
C
/*
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* Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
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*
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* Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Author Rickard E. (Rik) Faith <faith@valinux.com>
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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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* PRECISION INSIGHT 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 OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/debugfs.h>
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#include <linux/fs.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/mount.h>
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#include <linux/slab.h>
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#include <drm/drmP.h>
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#include <drm/drm_core.h>
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#include "drm_legacy.h"
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#include "drm_internal.h"
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unsigned int drm_debug = 0; /* bitmask of DRM_UT_x */
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EXPORT_SYMBOL(drm_debug);
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MODULE_AUTHOR(CORE_AUTHOR);
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MODULE_DESCRIPTION(CORE_DESC);
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MODULE_LICENSE("GPL and additional rights");
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MODULE_PARM_DESC(debug, "Enable debug output");
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module_param_named(debug, drm_debug, int, 0600);
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static DEFINE_SPINLOCK(drm_minor_lock);
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static struct idr drm_minors_idr;
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static struct dentry *drm_debugfs_root;
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void drm_err(const char *format, ...)
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{
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struct va_format vaf;
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va_list args;
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va_start(args, format);
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vaf.fmt = format;
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vaf.va = &args;
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printk(KERN_ERR "[" DRM_NAME ":%ps] *ERROR* %pV",
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__builtin_return_address(0), &vaf);
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va_end(args);
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}
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EXPORT_SYMBOL(drm_err);
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void drm_ut_debug_printk(const char *function_name, const char *format, ...)
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{
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struct va_format vaf;
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va_list args;
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va_start(args, format);
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vaf.fmt = format;
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vaf.va = &args;
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printk(KERN_DEBUG "[" DRM_NAME ":%s] %pV", function_name, &vaf);
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va_end(args);
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}
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EXPORT_SYMBOL(drm_ut_debug_printk);
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struct drm_master *drm_master_create(struct drm_minor *minor)
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{
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struct drm_master *master;
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master = kzalloc(sizeof(*master), GFP_KERNEL);
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if (!master)
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return NULL;
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kref_init(&master->refcount);
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spin_lock_init(&master->lock.spinlock);
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init_waitqueue_head(&master->lock.lock_queue);
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idr_init(&master->magic_map);
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master->minor = minor;
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return master;
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}
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struct drm_master *drm_master_get(struct drm_master *master)
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{
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kref_get(&master->refcount);
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return master;
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}
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EXPORT_SYMBOL(drm_master_get);
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static void drm_master_destroy(struct kref *kref)
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{
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struct drm_master *master = container_of(kref, struct drm_master, refcount);
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struct drm_device *dev = master->minor->dev;
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struct drm_map_list *r_list, *list_temp;
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mutex_lock(&dev->struct_mutex);
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if (dev->driver->master_destroy)
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dev->driver->master_destroy(dev, master);
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list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
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if (r_list->master == master) {
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drm_legacy_rmmap_locked(dev, r_list->map);
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r_list = NULL;
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}
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}
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mutex_unlock(&dev->struct_mutex);
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idr_destroy(&master->magic_map);
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kfree(master->unique);
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kfree(master);
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}
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void drm_master_put(struct drm_master **master)
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{
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kref_put(&(*master)->refcount, drm_master_destroy);
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*master = NULL;
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}
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EXPORT_SYMBOL(drm_master_put);
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int drm_setmaster_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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int ret = 0;
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mutex_lock(&dev->master_mutex);
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if (file_priv->is_master)
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goto out_unlock;
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if (file_priv->minor->master) {
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ret = -EINVAL;
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goto out_unlock;
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}
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if (!file_priv->master) {
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ret = -EINVAL;
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goto out_unlock;
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}
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if (!file_priv->allowed_master) {
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ret = drm_new_set_master(dev, file_priv);
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goto out_unlock;
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}
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file_priv->minor->master = drm_master_get(file_priv->master);
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file_priv->is_master = 1;
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if (dev->driver->master_set) {
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ret = dev->driver->master_set(dev, file_priv, false);
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if (unlikely(ret != 0)) {
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file_priv->is_master = 0;
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drm_master_put(&file_priv->minor->master);
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}
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}
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out_unlock:
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mutex_unlock(&dev->master_mutex);
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return ret;
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}
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int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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int ret = -EINVAL;
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mutex_lock(&dev->master_mutex);
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if (!file_priv->is_master)
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goto out_unlock;
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if (!file_priv->minor->master)
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goto out_unlock;
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ret = 0;
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if (dev->driver->master_drop)
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dev->driver->master_drop(dev, file_priv, false);
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drm_master_put(&file_priv->minor->master);
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file_priv->is_master = 0;
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out_unlock:
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mutex_unlock(&dev->master_mutex);
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return ret;
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}
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/*
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* DRM Minors
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* A DRM device can provide several char-dev interfaces on the DRM-Major. Each
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* of them is represented by a drm_minor object. Depending on the capabilities
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* of the device-driver, different interfaces are registered.
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*
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* Minors can be accessed via dev->$minor_name. This pointer is either
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* NULL or a valid drm_minor pointer and stays valid as long as the device is
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* valid. This means, DRM minors have the same life-time as the underlying
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* device. However, this doesn't mean that the minor is active. Minors are
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* registered and unregistered dynamically according to device-state.
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*/
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static struct drm_minor **drm_minor_get_slot(struct drm_device *dev,
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unsigned int type)
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{
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switch (type) {
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case DRM_MINOR_LEGACY:
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return &dev->primary;
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case DRM_MINOR_RENDER:
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return &dev->render;
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case DRM_MINOR_CONTROL:
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return &dev->control;
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default:
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return NULL;
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}
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}
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static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
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{
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struct drm_minor *minor;
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unsigned long flags;
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int r;
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minor = kzalloc(sizeof(*minor), GFP_KERNEL);
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if (!minor)
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return -ENOMEM;
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minor->type = type;
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minor->dev = dev;
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idr_preload(GFP_KERNEL);
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spin_lock_irqsave(&drm_minor_lock, flags);
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r = idr_alloc(&drm_minors_idr,
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NULL,
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64 * type,
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64 * (type + 1),
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GFP_NOWAIT);
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spin_unlock_irqrestore(&drm_minor_lock, flags);
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idr_preload_end();
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if (r < 0)
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goto err_free;
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minor->index = r;
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minor->kdev = drm_sysfs_minor_alloc(minor);
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if (IS_ERR(minor->kdev)) {
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r = PTR_ERR(minor->kdev);
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goto err_index;
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}
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*drm_minor_get_slot(dev, type) = minor;
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return 0;
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err_index:
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spin_lock_irqsave(&drm_minor_lock, flags);
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idr_remove(&drm_minors_idr, minor->index);
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spin_unlock_irqrestore(&drm_minor_lock, flags);
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err_free:
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kfree(minor);
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return r;
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}
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static void drm_minor_free(struct drm_device *dev, unsigned int type)
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{
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struct drm_minor **slot, *minor;
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unsigned long flags;
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slot = drm_minor_get_slot(dev, type);
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minor = *slot;
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if (!minor)
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return;
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put_device(minor->kdev);
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spin_lock_irqsave(&drm_minor_lock, flags);
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idr_remove(&drm_minors_idr, minor->index);
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spin_unlock_irqrestore(&drm_minor_lock, flags);
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kfree(minor);
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*slot = NULL;
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}
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static int drm_minor_register(struct drm_device *dev, unsigned int type)
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{
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struct drm_minor *minor;
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unsigned long flags;
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int ret;
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DRM_DEBUG("\n");
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minor = *drm_minor_get_slot(dev, type);
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if (!minor)
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return 0;
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ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root);
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if (ret) {
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DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
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return ret;
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}
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ret = device_add(minor->kdev);
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if (ret)
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goto err_debugfs;
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/* replace NULL with @minor so lookups will succeed from now on */
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spin_lock_irqsave(&drm_minor_lock, flags);
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idr_replace(&drm_minors_idr, minor, minor->index);
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spin_unlock_irqrestore(&drm_minor_lock, flags);
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DRM_DEBUG("new minor registered %d\n", minor->index);
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return 0;
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err_debugfs:
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drm_debugfs_cleanup(minor);
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return ret;
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}
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static void drm_minor_unregister(struct drm_device *dev, unsigned int type)
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{
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struct drm_minor *minor;
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unsigned long flags;
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minor = *drm_minor_get_slot(dev, type);
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if (!minor || !device_is_registered(minor->kdev))
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return;
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/* replace @minor with NULL so lookups will fail from now on */
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spin_lock_irqsave(&drm_minor_lock, flags);
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idr_replace(&drm_minors_idr, NULL, minor->index);
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spin_unlock_irqrestore(&drm_minor_lock, flags);
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device_del(minor->kdev);
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dev_set_drvdata(minor->kdev, NULL); /* safety belt */
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drm_debugfs_cleanup(minor);
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}
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/**
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* drm_minor_acquire - Acquire a DRM minor
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* @minor_id: Minor ID of the DRM-minor
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*
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* Looks up the given minor-ID and returns the respective DRM-minor object. The
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* refence-count of the underlying device is increased so you must release this
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* object with drm_minor_release().
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*
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* As long as you hold this minor, it is guaranteed that the object and the
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* minor->dev pointer will stay valid! However, the device may get unplugged and
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* unregistered while you hold the minor.
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*
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* Returns:
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* Pointer to minor-object with increased device-refcount, or PTR_ERR on
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* failure.
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*/
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struct drm_minor *drm_minor_acquire(unsigned int minor_id)
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{
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struct drm_minor *minor;
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unsigned long flags;
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spin_lock_irqsave(&drm_minor_lock, flags);
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minor = idr_find(&drm_minors_idr, minor_id);
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if (minor)
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drm_dev_ref(minor->dev);
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spin_unlock_irqrestore(&drm_minor_lock, flags);
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if (!minor) {
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return ERR_PTR(-ENODEV);
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} else if (drm_device_is_unplugged(minor->dev)) {
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drm_dev_unref(minor->dev);
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return ERR_PTR(-ENODEV);
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}
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return minor;
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}
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/**
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* drm_minor_release - Release DRM minor
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* @minor: Pointer to DRM minor object
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*
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* Release a minor that was previously acquired via drm_minor_acquire().
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*/
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void drm_minor_release(struct drm_minor *minor)
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{
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drm_dev_unref(minor->dev);
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}
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/**
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* DOC: driver instance overview
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*
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* A device instance for a drm driver is represented by struct &drm_device. This
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* is allocated with drm_dev_alloc(), usually from bus-specific ->probe()
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* callbacks implemented by the driver. The driver then needs to initialize all
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* the various subsystems for the drm device like memory management, vblank
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* handling, modesetting support and intial output configuration plus obviously
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* initialize all the corresponding hardware bits. An important part of this is
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* also calling drm_dev_set_unique() to set the userspace-visible unique name of
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* this device instance. Finally when everything is up and running and ready for
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* userspace the device instance can be published using drm_dev_register().
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*
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* There is also deprecated support for initalizing device instances using
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* bus-specific helpers and the ->load() callback. But due to
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* backwards-compatibility needs the device instance have to be published too
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* early, which requires unpretty global locking to make safe and is therefore
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* only support for existing drivers not yet converted to the new scheme.
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*
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* When cleaning up a device instance everything needs to be done in reverse:
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* First unpublish the device instance with drm_dev_unregister(). Then clean up
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* any other resources allocated at device initialization and drop the driver's
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* reference to &drm_device using drm_dev_unref().
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*
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* Note that the lifetime rules for &drm_device instance has still a lot of
|
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* historical baggage. Hence use the reference counting provided by
|
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* drm_dev_ref() and drm_dev_unref() only carefully.
|
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*
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* Also note that embedding of &drm_device is currently not (yet) supported (but
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* it would be easy to add). Drivers can store driver-private data in the
|
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* dev_priv field of &drm_device.
|
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*/
|
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/**
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* drm_put_dev - Unregister and release a DRM device
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* @dev: DRM device
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*
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* Called at module unload time or when a PCI device is unplugged.
|
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*
|
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* Cleans up all DRM device, calling drm_lastclose().
|
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*
|
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* Note: Use of this function is deprecated. It will eventually go away
|
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* completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly
|
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* instead to make sure that the device isn't userspace accessible any more
|
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* while teardown is in progress, ensuring that userspace can't access an
|
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* inconsistent state.
|
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*/
|
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void drm_put_dev(struct drm_device *dev)
|
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{
|
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DRM_DEBUG("\n");
|
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|
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if (!dev) {
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DRM_ERROR("cleanup called no dev\n");
|
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return;
|
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}
|
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|
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drm_dev_unregister(dev);
|
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drm_dev_unref(dev);
|
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}
|
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EXPORT_SYMBOL(drm_put_dev);
|
|
|
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void drm_unplug_dev(struct drm_device *dev)
|
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{
|
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/* for a USB device */
|
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drm_minor_unregister(dev, DRM_MINOR_LEGACY);
|
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drm_minor_unregister(dev, DRM_MINOR_RENDER);
|
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drm_minor_unregister(dev, DRM_MINOR_CONTROL);
|
|
|
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mutex_lock(&drm_global_mutex);
|
|
|
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drm_device_set_unplugged(dev);
|
|
|
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if (dev->open_count == 0) {
|
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drm_put_dev(dev);
|
|
}
|
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mutex_unlock(&drm_global_mutex);
|
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}
|
|
EXPORT_SYMBOL(drm_unplug_dev);
|
|
|
|
/*
|
|
* DRM internal mount
|
|
* We want to be able to allocate our own "struct address_space" to control
|
|
* memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow
|
|
* stand-alone address_space objects, so we need an underlying inode. As there
|
|
* is no way to allocate an independent inode easily, we need a fake internal
|
|
* VFS mount-point.
|
|
*
|
|
* The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free()
|
|
* frees it again. You are allowed to use iget() and iput() to get references to
|
|
* the inode. But each drm_fs_inode_new() call must be paired with exactly one
|
|
* drm_fs_inode_free() call (which does not have to be the last iput()).
|
|
* We use drm_fs_inode_*() to manage our internal VFS mount-point and share it
|
|
* between multiple inode-users. You could, technically, call
|
|
* iget() + drm_fs_inode_free() directly after alloc and sometime later do an
|
|
* iput(), but this way you'd end up with a new vfsmount for each inode.
|
|
*/
|
|
|
|
static int drm_fs_cnt;
|
|
static struct vfsmount *drm_fs_mnt;
|
|
|
|
static const struct dentry_operations drm_fs_dops = {
|
|
.d_dname = simple_dname,
|
|
};
|
|
|
|
static const struct super_operations drm_fs_sops = {
|
|
.statfs = simple_statfs,
|
|
};
|
|
|
|
static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags,
|
|
const char *dev_name, void *data)
|
|
{
|
|
return mount_pseudo(fs_type,
|
|
"drm:",
|
|
&drm_fs_sops,
|
|
&drm_fs_dops,
|
|
0x010203ff);
|
|
}
|
|
|
|
static struct file_system_type drm_fs_type = {
|
|
.name = "drm",
|
|
.owner = THIS_MODULE,
|
|
.mount = drm_fs_mount,
|
|
.kill_sb = kill_anon_super,
|
|
};
|
|
|
|
static struct inode *drm_fs_inode_new(void)
|
|
{
|
|
struct inode *inode;
|
|
int r;
|
|
|
|
r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt);
|
|
if (r < 0) {
|
|
DRM_ERROR("Cannot mount pseudo fs: %d\n", r);
|
|
return ERR_PTR(r);
|
|
}
|
|
|
|
inode = alloc_anon_inode(drm_fs_mnt->mnt_sb);
|
|
if (IS_ERR(inode))
|
|
simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
|
|
|
|
return inode;
|
|
}
|
|
|
|
static void drm_fs_inode_free(struct inode *inode)
|
|
{
|
|
if (inode) {
|
|
iput(inode);
|
|
simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* drm_dev_alloc - Allocate new DRM device
|
|
* @driver: DRM driver to allocate device for
|
|
* @parent: Parent device object
|
|
*
|
|
* Allocate and initialize a new DRM device. No device registration is done.
|
|
* Call drm_dev_register() to advertice the device to user space and register it
|
|
* with other core subsystems. This should be done last in the device
|
|
* initialization sequence to make sure userspace can't access an inconsistent
|
|
* state.
|
|
*
|
|
* The initial ref-count of the object is 1. Use drm_dev_ref() and
|
|
* drm_dev_unref() to take and drop further ref-counts.
|
|
*
|
|
* Note that for purely virtual devices @parent can be NULL.
|
|
*
|
|
* RETURNS:
|
|
* Pointer to new DRM device, or NULL if out of memory.
|
|
*/
|
|
struct drm_device *drm_dev_alloc(struct drm_driver *driver,
|
|
struct device *parent)
|
|
{
|
|
struct drm_device *dev;
|
|
int ret;
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (!dev)
|
|
return NULL;
|
|
|
|
kref_init(&dev->ref);
|
|
dev->dev = parent;
|
|
dev->driver = driver;
|
|
|
|
INIT_LIST_HEAD(&dev->filelist);
|
|
INIT_LIST_HEAD(&dev->ctxlist);
|
|
INIT_LIST_HEAD(&dev->vmalist);
|
|
INIT_LIST_HEAD(&dev->maplist);
|
|
INIT_LIST_HEAD(&dev->vblank_event_list);
|
|
|
|
spin_lock_init(&dev->buf_lock);
|
|
spin_lock_init(&dev->event_lock);
|
|
mutex_init(&dev->struct_mutex);
|
|
mutex_init(&dev->ctxlist_mutex);
|
|
mutex_init(&dev->master_mutex);
|
|
|
|
dev->anon_inode = drm_fs_inode_new();
|
|
if (IS_ERR(dev->anon_inode)) {
|
|
ret = PTR_ERR(dev->anon_inode);
|
|
DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret);
|
|
goto err_free;
|
|
}
|
|
|
|
if (drm_core_check_feature(dev, DRIVER_MODESET)) {
|
|
ret = drm_minor_alloc(dev, DRM_MINOR_CONTROL);
|
|
if (ret)
|
|
goto err_minors;
|
|
|
|
WARN_ON(driver->suspend || driver->resume);
|
|
}
|
|
|
|
if (drm_core_check_feature(dev, DRIVER_RENDER)) {
|
|
ret = drm_minor_alloc(dev, DRM_MINOR_RENDER);
|
|
if (ret)
|
|
goto err_minors;
|
|
}
|
|
|
|
ret = drm_minor_alloc(dev, DRM_MINOR_LEGACY);
|
|
if (ret)
|
|
goto err_minors;
|
|
|
|
if (drm_ht_create(&dev->map_hash, 12))
|
|
goto err_minors;
|
|
|
|
drm_legacy_ctxbitmap_init(dev);
|
|
|
|
if (drm_core_check_feature(dev, DRIVER_GEM)) {
|
|
ret = drm_gem_init(dev);
|
|
if (ret) {
|
|
DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n");
|
|
goto err_ctxbitmap;
|
|
}
|
|
}
|
|
|
|
if (parent) {
|
|
ret = drm_dev_set_unique(dev, dev_name(parent));
|
|
if (ret)
|
|
goto err_setunique;
|
|
}
|
|
|
|
return dev;
|
|
|
|
err_setunique:
|
|
if (drm_core_check_feature(dev, DRIVER_GEM))
|
|
drm_gem_destroy(dev);
|
|
err_ctxbitmap:
|
|
drm_legacy_ctxbitmap_cleanup(dev);
|
|
drm_ht_remove(&dev->map_hash);
|
|
err_minors:
|
|
drm_minor_free(dev, DRM_MINOR_LEGACY);
|
|
drm_minor_free(dev, DRM_MINOR_RENDER);
|
|
drm_minor_free(dev, DRM_MINOR_CONTROL);
|
|
drm_fs_inode_free(dev->anon_inode);
|
|
err_free:
|
|
mutex_destroy(&dev->master_mutex);
|
|
kfree(dev);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(drm_dev_alloc);
|
|
|
|
static void drm_dev_release(struct kref *ref)
|
|
{
|
|
struct drm_device *dev = container_of(ref, struct drm_device, ref);
|
|
|
|
if (drm_core_check_feature(dev, DRIVER_GEM))
|
|
drm_gem_destroy(dev);
|
|
|
|
drm_legacy_ctxbitmap_cleanup(dev);
|
|
drm_ht_remove(&dev->map_hash);
|
|
drm_fs_inode_free(dev->anon_inode);
|
|
|
|
drm_minor_free(dev, DRM_MINOR_LEGACY);
|
|
drm_minor_free(dev, DRM_MINOR_RENDER);
|
|
drm_minor_free(dev, DRM_MINOR_CONTROL);
|
|
|
|
mutex_destroy(&dev->master_mutex);
|
|
kfree(dev->unique);
|
|
kfree(dev);
|
|
}
|
|
|
|
/**
|
|
* drm_dev_ref - Take reference of a DRM device
|
|
* @dev: device to take reference of or NULL
|
|
*
|
|
* This increases the ref-count of @dev by one. You *must* already own a
|
|
* reference when calling this. Use drm_dev_unref() to drop this reference
|
|
* again.
|
|
*
|
|
* This function never fails. However, this function does not provide *any*
|
|
* guarantee whether the device is alive or running. It only provides a
|
|
* reference to the object and the memory associated with it.
|
|
*/
|
|
void drm_dev_ref(struct drm_device *dev)
|
|
{
|
|
if (dev)
|
|
kref_get(&dev->ref);
|
|
}
|
|
EXPORT_SYMBOL(drm_dev_ref);
|
|
|
|
/**
|
|
* drm_dev_unref - Drop reference of a DRM device
|
|
* @dev: device to drop reference of or NULL
|
|
*
|
|
* This decreases the ref-count of @dev by one. The device is destroyed if the
|
|
* ref-count drops to zero.
|
|
*/
|
|
void drm_dev_unref(struct drm_device *dev)
|
|
{
|
|
if (dev)
|
|
kref_put(&dev->ref, drm_dev_release);
|
|
}
|
|
EXPORT_SYMBOL(drm_dev_unref);
|
|
|
|
/**
|
|
* drm_dev_register - Register DRM device
|
|
* @dev: Device to register
|
|
* @flags: Flags passed to the driver's .load() function
|
|
*
|
|
* Register the DRM device @dev with the system, advertise device to user-space
|
|
* and start normal device operation. @dev must be allocated via drm_dev_alloc()
|
|
* previously.
|
|
*
|
|
* Never call this twice on any device!
|
|
*
|
|
* NOTE: To ensure backward compatibility with existing drivers method this
|
|
* function calls the ->load() method after registering the device nodes,
|
|
* creating race conditions. Usage of the ->load() methods is therefore
|
|
* deprecated, drivers must perform all initialization before calling
|
|
* drm_dev_register().
|
|
*
|
|
* RETURNS:
|
|
* 0 on success, negative error code on failure.
|
|
*/
|
|
int drm_dev_register(struct drm_device *dev, unsigned long flags)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&drm_global_mutex);
|
|
|
|
ret = drm_minor_register(dev, DRM_MINOR_CONTROL);
|
|
if (ret)
|
|
goto err_minors;
|
|
|
|
ret = drm_minor_register(dev, DRM_MINOR_RENDER);
|
|
if (ret)
|
|
goto err_minors;
|
|
|
|
ret = drm_minor_register(dev, DRM_MINOR_LEGACY);
|
|
if (ret)
|
|
goto err_minors;
|
|
|
|
if (dev->driver->load) {
|
|
ret = dev->driver->load(dev, flags);
|
|
if (ret)
|
|
goto err_minors;
|
|
}
|
|
|
|
ret = 0;
|
|
goto out_unlock;
|
|
|
|
err_minors:
|
|
drm_minor_unregister(dev, DRM_MINOR_LEGACY);
|
|
drm_minor_unregister(dev, DRM_MINOR_RENDER);
|
|
drm_minor_unregister(dev, DRM_MINOR_CONTROL);
|
|
out_unlock:
|
|
mutex_unlock(&drm_global_mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_dev_register);
|
|
|
|
/**
|
|
* drm_dev_unregister - Unregister DRM device
|
|
* @dev: Device to unregister
|
|
*
|
|
* Unregister the DRM device from the system. This does the reverse of
|
|
* drm_dev_register() but does not deallocate the device. The caller must call
|
|
* drm_dev_unref() to drop their final reference.
|
|
*
|
|
* This should be called first in the device teardown code to make sure
|
|
* userspace can't access the device instance any more.
|
|
*/
|
|
void drm_dev_unregister(struct drm_device *dev)
|
|
{
|
|
struct drm_map_list *r_list, *list_temp;
|
|
|
|
drm_lastclose(dev);
|
|
|
|
if (dev->driver->unload)
|
|
dev->driver->unload(dev);
|
|
|
|
if (dev->agp)
|
|
drm_pci_agp_destroy(dev);
|
|
|
|
drm_vblank_cleanup(dev);
|
|
|
|
list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
|
|
drm_legacy_rmmap(dev, r_list->map);
|
|
|
|
drm_minor_unregister(dev, DRM_MINOR_LEGACY);
|
|
drm_minor_unregister(dev, DRM_MINOR_RENDER);
|
|
drm_minor_unregister(dev, DRM_MINOR_CONTROL);
|
|
}
|
|
EXPORT_SYMBOL(drm_dev_unregister);
|
|
|
|
/**
|
|
* drm_dev_set_unique - Set the unique name of a DRM device
|
|
* @dev: device of which to set the unique name
|
|
* @name: unique name
|
|
*
|
|
* Sets the unique name of a DRM device using the specified string. Drivers
|
|
* can use this at driver probe time if the unique name of the devices they
|
|
* drive is static.
|
|
*
|
|
* Return: 0 on success or a negative error code on failure.
|
|
*/
|
|
int drm_dev_set_unique(struct drm_device *dev, const char *name)
|
|
{
|
|
kfree(dev->unique);
|
|
dev->unique = kstrdup(name, GFP_KERNEL);
|
|
|
|
return dev->unique ? 0 : -ENOMEM;
|
|
}
|
|
EXPORT_SYMBOL(drm_dev_set_unique);
|
|
|
|
/*
|
|
* DRM Core
|
|
* The DRM core module initializes all global DRM objects and makes them
|
|
* available to drivers. Once setup, drivers can probe their respective
|
|
* devices.
|
|
* Currently, core management includes:
|
|
* - The "DRM-Global" key/value database
|
|
* - Global ID management for connectors
|
|
* - DRM major number allocation
|
|
* - DRM minor management
|
|
* - DRM sysfs class
|
|
* - DRM debugfs root
|
|
*
|
|
* Furthermore, the DRM core provides dynamic char-dev lookups. For each
|
|
* interface registered on a DRM device, you can request minor numbers from DRM
|
|
* core. DRM core takes care of major-number management and char-dev
|
|
* registration. A stub ->open() callback forwards any open() requests to the
|
|
* registered minor.
|
|
*/
|
|
|
|
static int drm_stub_open(struct inode *inode, struct file *filp)
|
|
{
|
|
const struct file_operations *new_fops;
|
|
struct drm_minor *minor;
|
|
int err;
|
|
|
|
DRM_DEBUG("\n");
|
|
|
|
mutex_lock(&drm_global_mutex);
|
|
minor = drm_minor_acquire(iminor(inode));
|
|
if (IS_ERR(minor)) {
|
|
err = PTR_ERR(minor);
|
|
goto out_unlock;
|
|
}
|
|
|
|
new_fops = fops_get(minor->dev->driver->fops);
|
|
if (!new_fops) {
|
|
err = -ENODEV;
|
|
goto out_release;
|
|
}
|
|
|
|
replace_fops(filp, new_fops);
|
|
if (filp->f_op->open)
|
|
err = filp->f_op->open(inode, filp);
|
|
else
|
|
err = 0;
|
|
|
|
out_release:
|
|
drm_minor_release(minor);
|
|
out_unlock:
|
|
mutex_unlock(&drm_global_mutex);
|
|
return err;
|
|
}
|
|
|
|
static const struct file_operations drm_stub_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = drm_stub_open,
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
static int __init drm_core_init(void)
|
|
{
|
|
int ret = -ENOMEM;
|
|
|
|
drm_global_init();
|
|
drm_connector_ida_init();
|
|
idr_init(&drm_minors_idr);
|
|
|
|
if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
|
|
goto err_p1;
|
|
|
|
ret = drm_sysfs_init();
|
|
if (ret < 0) {
|
|
printk(KERN_ERR "DRM: Error creating drm class.\n");
|
|
goto err_p2;
|
|
}
|
|
|
|
drm_debugfs_root = debugfs_create_dir("dri", NULL);
|
|
if (!drm_debugfs_root) {
|
|
DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
|
|
ret = -1;
|
|
goto err_p3;
|
|
}
|
|
|
|
DRM_INFO("Initialized %s %d.%d.%d %s\n",
|
|
CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
|
|
return 0;
|
|
err_p3:
|
|
drm_sysfs_destroy();
|
|
err_p2:
|
|
unregister_chrdev(DRM_MAJOR, "drm");
|
|
|
|
idr_destroy(&drm_minors_idr);
|
|
err_p1:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit drm_core_exit(void)
|
|
{
|
|
debugfs_remove(drm_debugfs_root);
|
|
drm_sysfs_destroy();
|
|
|
|
unregister_chrdev(DRM_MAJOR, "drm");
|
|
|
|
drm_connector_ida_destroy();
|
|
idr_destroy(&drm_minors_idr);
|
|
}
|
|
|
|
module_init(drm_core_init);
|
|
module_exit(drm_core_exit);
|