![David Herrmann](/assets/img/avatar_default.png)
We moved minor deallocation to drm_dev_free() in: commit8f6599da8e
Author: David Herrmann <dh.herrmann@gmail.com> Date: Sun Oct 20 18:55:45 2013 +0200 drm: delay minor destruction to drm_dev_free() However, this causes a call to drm_unplug_minor(), which should just do nothing as drm_dev_unregister() already called this. But a separate patch caused kdev lifetime changes: commit5bdebb183c
Author: Dave Airlie <airlied@redhat.com> Date: Fri Oct 11 14:07:25 2013 +1000 drm/sysfs: sort out minor and connector device object lifetimes. Thus making our dev_is_registered() call useles (and even segfault if it is NULL). Replace it with a simple !kdev test and we're fine. Reported-by: Huax Lu <huax.lu@intel.com> Reported-by: Daniel Vetter <daniel@ffwll.ch> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=71208 Tested-by: lu hua <huax.lu@intel.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Dave Airlie <airlied@gmail.com>
615 lines
15 KiB
C
615 lines
15 KiB
C
/**
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* \file drm_stub.h
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* Stub support
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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*/
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/*
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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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* 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/module.h>
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#include <linux/moduleparam.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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unsigned int drm_debug = 0; /* 1 to enable debug output */
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EXPORT_SYMBOL(drm_debug);
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unsigned int drm_rnodes = 0; /* 1 to enable experimental render nodes API */
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EXPORT_SYMBOL(drm_rnodes);
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unsigned int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */
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EXPORT_SYMBOL(drm_vblank_offdelay);
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unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */
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EXPORT_SYMBOL(drm_timestamp_precision);
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/*
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* Default to use monotonic timestamps for wait-for-vblank and page-flip
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* complete events.
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*/
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unsigned int drm_timestamp_monotonic = 1;
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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_PARM_DESC(rnodes, "Enable experimental render nodes API");
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MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs]");
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MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]");
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MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps");
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module_param_named(debug, drm_debug, int, 0600);
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module_param_named(rnodes, drm_rnodes, int, 0600);
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module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
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module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600);
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module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600);
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struct idr drm_minors_idr;
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struct class *drm_class;
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struct dentry *drm_debugfs_root;
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int drm_err(const char *func, 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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int r;
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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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r = printk(KERN_ERR "[" DRM_NAME ":%s] *ERROR* %pV", func, &vaf);
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va_end(args);
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return r;
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}
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EXPORT_SYMBOL(drm_err);
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void drm_ut_debug_printk(unsigned int request_level,
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const char *prefix,
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const char *function_name,
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const char *format, ...)
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{
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va_list args;
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if (drm_debug & request_level) {
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if (function_name)
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printk(KERN_DEBUG "[%s:%s], ", prefix, function_name);
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va_start(args, format);
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vprintk(format, args);
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va_end(args);
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}
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}
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EXPORT_SYMBOL(drm_ut_debug_printk);
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static int drm_minor_get_id(struct drm_device *dev, int type)
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{
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int ret;
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int base = 0, limit = 63;
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if (type == DRM_MINOR_CONTROL) {
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base += 64;
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limit = base + 63;
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} else if (type == DRM_MINOR_RENDER) {
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base += 128;
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limit = base + 63;
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}
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mutex_lock(&dev->struct_mutex);
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ret = idr_alloc(&drm_minors_idr, NULL, base, limit, GFP_KERNEL);
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mutex_unlock(&dev->struct_mutex);
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return ret == -ENOSPC ? -EINVAL : ret;
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}
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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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drm_ht_create(&master->magiclist, DRM_MAGIC_HASH_ORDER);
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INIT_LIST_HEAD(&master->magicfree);
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master->minor = minor;
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list_add_tail(&master->head, &minor->master_list);
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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_magic_entry *pt, *next;
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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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list_del(&master->head);
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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_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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if (master->unique) {
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kfree(master->unique);
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master->unique = NULL;
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master->unique_len = 0;
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}
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kfree(dev->devname);
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dev->devname = NULL;
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list_for_each_entry_safe(pt, next, &master->magicfree, head) {
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list_del(&pt->head);
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drm_ht_remove_item(&master->magiclist, &pt->hash_item);
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kfree(pt);
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}
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drm_ht_remove(&master->magiclist);
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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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if (file_priv->is_master)
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return 0;
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if (file_priv->minor->master && file_priv->minor->master != file_priv->master)
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return -EINVAL;
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if (!file_priv->master)
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return -EINVAL;
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if (file_priv->minor->master)
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return -EINVAL;
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mutex_lock(&dev->struct_mutex);
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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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mutex_unlock(&dev->struct_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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if (!file_priv->is_master)
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return -EINVAL;
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if (!file_priv->minor->master)
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return -EINVAL;
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mutex_lock(&dev->struct_mutex);
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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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mutex_unlock(&dev->struct_mutex);
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return 0;
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}
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/**
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* drm_get_minor - Allocate and register new DRM minor
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* @dev: DRM device
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* @minor: Pointer to where new minor is stored
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* @type: Type of minor
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*
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* Allocate a new minor of the given type and register it. A pointer to the new
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* minor is returned in @minor.
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* Caller must hold the global DRM mutex.
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*
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* RETURNS:
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* 0 on success, negative error code on failure.
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*/
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static int drm_get_minor(struct drm_device *dev, struct drm_minor **minor,
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int type)
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{
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struct drm_minor *new_minor;
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int ret;
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int minor_id;
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DRM_DEBUG("\n");
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minor_id = drm_minor_get_id(dev, type);
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if (minor_id < 0)
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return minor_id;
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new_minor = kzalloc(sizeof(struct drm_minor), GFP_KERNEL);
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if (!new_minor) {
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ret = -ENOMEM;
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goto err_idr;
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}
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new_minor->type = type;
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new_minor->device = MKDEV(DRM_MAJOR, minor_id);
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new_minor->dev = dev;
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new_minor->index = minor_id;
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INIT_LIST_HEAD(&new_minor->master_list);
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idr_replace(&drm_minors_idr, new_minor, minor_id);
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#if defined(CONFIG_DEBUG_FS)
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ret = drm_debugfs_init(new_minor, minor_id, 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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goto err_mem;
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}
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#endif
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ret = drm_sysfs_device_add(new_minor);
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if (ret) {
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printk(KERN_ERR
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"DRM: Error sysfs_device_add.\n");
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goto err_debugfs;
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}
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*minor = new_minor;
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DRM_DEBUG("new minor assigned %d\n", minor_id);
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return 0;
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err_debugfs:
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#if defined(CONFIG_DEBUG_FS)
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drm_debugfs_cleanup(new_minor);
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err_mem:
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#endif
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kfree(new_minor);
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err_idr:
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idr_remove(&drm_minors_idr, minor_id);
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*minor = NULL;
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return ret;
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}
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/**
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* drm_unplug_minor - Unplug DRM minor
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* @minor: Minor to unplug
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*
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* Unplugs the given DRM minor but keeps the object. So after this returns,
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* minor->dev is still valid so existing open-files can still access it to get
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* device information from their drm_file ojects.
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* If the minor is already unplugged or if @minor is NULL, nothing is done.
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* The global DRM mutex must be held by the caller.
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*/
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static void drm_unplug_minor(struct drm_minor *minor)
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{
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if (!minor || !minor->kdev)
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return;
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#if defined(CONFIG_DEBUG_FS)
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drm_debugfs_cleanup(minor);
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#endif
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drm_sysfs_device_remove(minor);
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idr_remove(&drm_minors_idr, minor->index);
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}
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/**
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* drm_put_minor - Destroy DRM minor
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* @minor: Minor to destroy
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*
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* This calls drm_unplug_minor() on the given minor and then frees it. Nothing
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* is done if @minor is NULL. It is fine to call this on already unplugged
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* minors.
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* The global DRM mutex must be held by the caller.
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*/
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static void drm_put_minor(struct drm_minor *minor)
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{
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if (!minor)
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return;
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DRM_DEBUG("release secondary minor %d\n", minor->index);
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drm_unplug_minor(minor);
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kfree(minor);
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}
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/**
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* Called via drm_exit() at module unload time or when pci device is
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* 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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*/
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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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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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drm_dev_unregister(dev);
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drm_dev_free(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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if (drm_core_check_feature(dev, DRIVER_MODESET))
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drm_unplug_minor(dev->control);
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if (dev->render)
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drm_unplug_minor(dev->render);
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drm_unplug_minor(dev->primary);
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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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}
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mutex_unlock(&drm_global_mutex);
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}
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EXPORT_SYMBOL(drm_unplug_dev);
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/**
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* drm_dev_alloc - Allocate new drm device
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* @driver: DRM driver to allocate device for
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* @parent: Parent device object
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*
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* Allocate and initialize a new DRM device. No device registration is done.
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* Call drm_dev_register() to advertice the device to user space and register it
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* with other core subsystems.
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*
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* RETURNS:
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* Pointer to new DRM device, or NULL if out of memory.
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*/
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struct drm_device *drm_dev_alloc(struct drm_driver *driver,
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struct device *parent)
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{
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struct drm_device *dev;
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int ret;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return NULL;
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dev->dev = parent;
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dev->driver = driver;
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INIT_LIST_HEAD(&dev->filelist);
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INIT_LIST_HEAD(&dev->ctxlist);
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INIT_LIST_HEAD(&dev->vmalist);
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INIT_LIST_HEAD(&dev->maplist);
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INIT_LIST_HEAD(&dev->vblank_event_list);
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spin_lock_init(&dev->count_lock);
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spin_lock_init(&dev->event_lock);
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mutex_init(&dev->struct_mutex);
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mutex_init(&dev->ctxlist_mutex);
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if (drm_ht_create(&dev->map_hash, 12))
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goto err_free;
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ret = drm_ctxbitmap_init(dev);
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if (ret) {
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DRM_ERROR("Cannot allocate memory for context bitmap.\n");
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goto err_ht;
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}
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if (driver->driver_features & DRIVER_GEM) {
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ret = drm_gem_init(dev);
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if (ret) {
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DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n");
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goto err_ctxbitmap;
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}
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}
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return dev;
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err_ctxbitmap:
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drm_ctxbitmap_cleanup(dev);
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err_ht:
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drm_ht_remove(&dev->map_hash);
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err_free:
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kfree(dev);
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return NULL;
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}
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EXPORT_SYMBOL(drm_dev_alloc);
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/**
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* drm_dev_free - Free DRM device
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* @dev: DRM device to free
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*
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* Free a DRM device that has previously been allocated via drm_dev_alloc().
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* You must not use kfree() instead or you will leak memory.
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*
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* This must not be called once the device got registered. Use drm_put_dev()
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* instead, which then calls drm_dev_free().
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*/
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void drm_dev_free(struct drm_device *dev)
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{
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drm_put_minor(dev->control);
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drm_put_minor(dev->render);
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drm_put_minor(dev->primary);
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if (dev->driver->driver_features & DRIVER_GEM)
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drm_gem_destroy(dev);
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drm_ctxbitmap_cleanup(dev);
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drm_ht_remove(&dev->map_hash);
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kfree(dev->devname);
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kfree(dev);
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}
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EXPORT_SYMBOL(drm_dev_free);
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/**
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* drm_dev_register - Register DRM device
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* @dev: Device to register
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*
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* Register the DRM device @dev with the system, advertise device to user-space
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* and start normal device operation. @dev must be allocated via drm_dev_alloc()
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* previously.
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*
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* Never call this twice on any device!
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*
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* RETURNS:
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* 0 on success, negative error code on failure.
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*/
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int drm_dev_register(struct drm_device *dev, unsigned long flags)
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{
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|
int ret;
|
|
|
|
mutex_lock(&drm_global_mutex);
|
|
|
|
if (dev->driver->bus->agp_init) {
|
|
ret = dev->driver->bus->agp_init(dev);
|
|
if (ret)
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (drm_core_check_feature(dev, DRIVER_MODESET)) {
|
|
ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
|
|
if (ret)
|
|
goto err_agp;
|
|
}
|
|
|
|
if (drm_core_check_feature(dev, DRIVER_RENDER) && drm_rnodes) {
|
|
ret = drm_get_minor(dev, &dev->render, DRM_MINOR_RENDER);
|
|
if (ret)
|
|
goto err_control_node;
|
|
}
|
|
|
|
ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY);
|
|
if (ret)
|
|
goto err_render_node;
|
|
|
|
if (dev->driver->load) {
|
|
ret = dev->driver->load(dev, flags);
|
|
if (ret)
|
|
goto err_primary_node;
|
|
}
|
|
|
|
/* setup grouping for legacy outputs */
|
|
if (drm_core_check_feature(dev, DRIVER_MODESET)) {
|
|
ret = drm_mode_group_init_legacy_group(dev,
|
|
&dev->primary->mode_group);
|
|
if (ret)
|
|
goto err_unload;
|
|
}
|
|
|
|
list_add_tail(&dev->driver_item, &dev->driver->device_list);
|
|
|
|
ret = 0;
|
|
goto out_unlock;
|
|
|
|
err_unload:
|
|
if (dev->driver->unload)
|
|
dev->driver->unload(dev);
|
|
err_primary_node:
|
|
drm_put_minor(dev->primary);
|
|
err_render_node:
|
|
drm_put_minor(dev->render);
|
|
err_control_node:
|
|
drm_put_minor(dev->control);
|
|
err_agp:
|
|
if (dev->driver->bus->agp_destroy)
|
|
dev->driver->bus->agp_destroy(dev);
|
|
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_free() to free all resources.
|
|
*/
|
|
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->driver->bus->agp_destroy)
|
|
dev->driver->bus->agp_destroy(dev);
|
|
|
|
drm_vblank_cleanup(dev);
|
|
|
|
list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
|
|
drm_rmmap(dev, r_list->map);
|
|
|
|
drm_unplug_minor(dev->control);
|
|
drm_unplug_minor(dev->render);
|
|
drm_unplug_minor(dev->primary);
|
|
|
|
list_del(&dev->driver_item);
|
|
}
|
|
EXPORT_SYMBOL(drm_dev_unregister);
|