![Hans de Goede](/assets/img/avatar_default.png)
commita39be606f9
("drm: Do a full device unregister when unplugging") causes backtraces like this one when unplugging an usb drm device while it is in use: usb 2-3: USB disconnect, device number 25 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 242 at drivers/gpu/drm/drm_mode_config.c:424 drm_mode_config_cleanup+0x220/0x280 [drm] ... RIP: 0010:drm_mode_config_cleanup+0x220/0x280 [drm] ... Call Trace: gm12u320_modeset_cleanup+0xe/0x10 [gm12u320] gm12u320_driver_unload+0x35/0x70 [gm12u320] drm_dev_unregister+0x3c/0xe0 [drm] drm_unplug_dev+0x12/0x60 [drm] gm12u320_usb_disconnect+0x36/0x40 [gm12u320] usb_unbind_interface+0x72/0x280 device_release_driver_internal+0x158/0x210 device_release_driver+0x12/0x20 bus_remove_device+0x104/0x180 device_del+0x1d2/0x350 usb_disable_device+0x9f/0x270 usb_disconnect+0xc6/0x260 ... [drm:drm_mode_config_cleanup [drm]] *ERROR* connector Unknown-1 leaked! ------------[ cut here ]------------ WARNING: CPU: 0 PID: 242 at drivers/gpu/drm/drm_mode_config.c:458 drm_mode_config_cleanup+0x268/0x280 [drm] ... <same Call Trace> ---[ end trace 80df975dae439ed6 ]--- general protection fault: 0000 [#1] SMP ... Call Trace: ? __switch_to+0x225/0x450 drm_mode_rmfb_work_fn+0x55/0x70 [drm] process_one_work+0x193/0x3c0 worker_thread+0x4a/0x3a0 ... RIP: drm_framebuffer_remove+0x62/0x3f0 [drm] RSP: ffffb776c39dfd98 ---[ end trace 80df975dae439ed7 ]--- After which the system is unusable this is caused by drm_dev_unregister getting called immediately on unplug, which calls the drivers unload function which calls drm_mode_config_cleanup which removes the framebuffer object while userspace is still holding a reference to it. Reverting commita39be606f9
("drm: Do a full device unregister when unplugging") leads to the following oops on unplug instead, when userspace closes the last fd referencing the drm_dev: sysfs group 'power' not found for kobject 'card1-Unknown-1' ------------[ cut here ]------------ WARNING: CPU: 0 PID: 2459 at fs/sysfs/group.c:237 sysfs_remove_group+0x80/0x90 ... RIP: 0010:sysfs_remove_group+0x80/0x90 ... Call Trace: dpm_sysfs_remove+0x57/0x60 device_del+0xfd/0x350 device_unregister+0x1a/0x60 drm_sysfs_connector_remove+0x39/0x50 [drm] drm_connector_unregister+0x5a/0x70 [drm] drm_connector_unregister_all+0x45/0xa0 [drm] drm_modeset_unregister_all+0x12/0x30 [drm] drm_dev_unregister+0xca/0xe0 [drm] drm_put_dev+0x32/0x60 [drm] drm_release+0x2f3/0x380 [drm] __fput+0xdf/0x1e0 ... ---[ end trace ecfb91ac85688bbe ]--- BUG: unable to handle kernel NULL pointer dereference at 00000000000000a8 IP: down_write+0x1f/0x40 ... Call Trace: debugfs_remove_recursive+0x55/0x1b0 drm_debugfs_connector_remove+0x21/0x40 [drm] drm_connector_unregister+0x62/0x70 [drm] drm_connector_unregister_all+0x45/0xa0 [drm] drm_modeset_unregister_all+0x12/0x30 [drm] drm_dev_unregister+0xca/0xe0 [drm] drm_put_dev+0x32/0x60 [drm] drm_release+0x2f3/0x380 [drm] __fput+0xdf/0x1e0 ... ---[ end trace ecfb91ac85688bbf ]--- This is caused by the revert moving back to drm_unplug_dev calling drm_minor_unregister which does: device_del(minor->kdev); dev_set_drvdata(minor->kdev, NULL); /* safety belt */ drm_debugfs_cleanup(minor); Causing the sysfs entries to already be removed even though we still have references to them in e.g. drm_connector. Note we must call drm_minor_unregister to notify userspace of the unplug of the device, so calling drm_dev_unregister is not completely wrong the problem is that drm_dev_unregister does too much. This commit fixes drm_unplug_dev by not only reverting commita39be606f9
("drm: Do a full device unregister when unplugging") but by also adding a call to drm_modeset_unregister_all before the drm_minor_unregister calls to make sure all sysfs entries are removed before calling device_del(minor->kdev) thereby also fixing the second set of oopses caused by just reverting the commit. Fixes:a39be606f9
("drm: Do a full device unregister when unplugging") Cc: stable@vger.kernel.org Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Jeffy <jeffy.chen@rock-chips.com> Cc: Marco Diego Aurélio Mesquita <marcodiegomesquita@gmail.com> Reported-by: Marco Diego Aurélio Mesquita <marcodiegomesquita@gmail.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Sean Paul <seanpaul@chromium.org> Link: http://patchwork.freedesktop.org/patch/msgid/20170601115430.4113-1-hdegoede@redhat.com
979 lines
26 KiB
C
979 lines
26 KiB
C
/*
|
|
* Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
|
|
*
|
|
* Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California.
|
|
* All Rights Reserved.
|
|
*
|
|
* Author Rickard E. (Rik) Faith <faith@valinux.com>
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice (including the next
|
|
* paragraph) shall be included in all copies or substantial portions of the
|
|
* Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
|
|
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
|
|
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
* DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
#include <linux/debugfs.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/mount.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <drm/drm_drv.h>
|
|
#include <drm/drmP.h>
|
|
|
|
#include "drm_crtc_internal.h"
|
|
#include "drm_legacy.h"
|
|
#include "drm_internal.h"
|
|
#include "drm_crtc_internal.h"
|
|
|
|
/*
|
|
* drm_debug: Enable debug output.
|
|
* Bitmask of DRM_UT_x. See include/drm/drmP.h for details.
|
|
*/
|
|
unsigned int drm_debug = 0;
|
|
EXPORT_SYMBOL(drm_debug);
|
|
|
|
MODULE_AUTHOR("Gareth Hughes, Leif Delgass, José Fonseca, Jon Smirl");
|
|
MODULE_DESCRIPTION("DRM shared core routines");
|
|
MODULE_LICENSE("GPL and additional rights");
|
|
MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug category.\n"
|
|
"\t\tBit 0 (0x01) will enable CORE messages (drm core code)\n"
|
|
"\t\tBit 1 (0x02) will enable DRIVER messages (drm controller code)\n"
|
|
"\t\tBit 2 (0x04) will enable KMS messages (modesetting code)\n"
|
|
"\t\tBit 3 (0x08) will enable PRIME messages (prime code)\n"
|
|
"\t\tBit 4 (0x10) will enable ATOMIC messages (atomic code)\n"
|
|
"\t\tBit 5 (0x20) will enable VBL messages (vblank code)");
|
|
module_param_named(debug, drm_debug, int, 0600);
|
|
|
|
static DEFINE_SPINLOCK(drm_minor_lock);
|
|
static struct idr drm_minors_idr;
|
|
|
|
static struct dentry *drm_debugfs_root;
|
|
|
|
#define DRM_PRINTK_FMT "[" DRM_NAME ":%s]%s %pV"
|
|
|
|
void drm_dev_printk(const struct device *dev, const char *level,
|
|
unsigned int category, const char *function_name,
|
|
const char *prefix, const char *format, ...)
|
|
{
|
|
struct va_format vaf;
|
|
va_list args;
|
|
|
|
if (category != DRM_UT_NONE && !(drm_debug & category))
|
|
return;
|
|
|
|
va_start(args, format);
|
|
vaf.fmt = format;
|
|
vaf.va = &args;
|
|
|
|
if (dev)
|
|
dev_printk(level, dev, DRM_PRINTK_FMT, function_name, prefix,
|
|
&vaf);
|
|
else
|
|
printk("%s" DRM_PRINTK_FMT, level, function_name, prefix, &vaf);
|
|
|
|
va_end(args);
|
|
}
|
|
EXPORT_SYMBOL(drm_dev_printk);
|
|
|
|
void drm_printk(const char *level, unsigned int category,
|
|
const char *format, ...)
|
|
{
|
|
struct va_format vaf;
|
|
va_list args;
|
|
|
|
if (category != DRM_UT_NONE && !(drm_debug & category))
|
|
return;
|
|
|
|
va_start(args, format);
|
|
vaf.fmt = format;
|
|
vaf.va = &args;
|
|
|
|
printk("%s" "[" DRM_NAME ":%ps]%s %pV",
|
|
level, __builtin_return_address(0),
|
|
strcmp(level, KERN_ERR) == 0 ? " *ERROR*" : "", &vaf);
|
|
|
|
va_end(args);
|
|
}
|
|
EXPORT_SYMBOL(drm_printk);
|
|
|
|
/*
|
|
* DRM Minors
|
|
* A DRM device can provide several char-dev interfaces on the DRM-Major. Each
|
|
* of them is represented by a drm_minor object. Depending on the capabilities
|
|
* of the device-driver, different interfaces are registered.
|
|
*
|
|
* Minors can be accessed via dev->$minor_name. This pointer is either
|
|
* NULL or a valid drm_minor pointer and stays valid as long as the device is
|
|
* valid. This means, DRM minors have the same life-time as the underlying
|
|
* device. However, this doesn't mean that the minor is active. Minors are
|
|
* registered and unregistered dynamically according to device-state.
|
|
*/
|
|
|
|
static struct drm_minor **drm_minor_get_slot(struct drm_device *dev,
|
|
unsigned int type)
|
|
{
|
|
switch (type) {
|
|
case DRM_MINOR_PRIMARY:
|
|
return &dev->primary;
|
|
case DRM_MINOR_RENDER:
|
|
return &dev->render;
|
|
case DRM_MINOR_CONTROL:
|
|
return &dev->control;
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
|
|
{
|
|
struct drm_minor *minor;
|
|
unsigned long flags;
|
|
int r;
|
|
|
|
minor = kzalloc(sizeof(*minor), GFP_KERNEL);
|
|
if (!minor)
|
|
return -ENOMEM;
|
|
|
|
minor->type = type;
|
|
minor->dev = dev;
|
|
|
|
idr_preload(GFP_KERNEL);
|
|
spin_lock_irqsave(&drm_minor_lock, flags);
|
|
r = idr_alloc(&drm_minors_idr,
|
|
NULL,
|
|
64 * type,
|
|
64 * (type + 1),
|
|
GFP_NOWAIT);
|
|
spin_unlock_irqrestore(&drm_minor_lock, flags);
|
|
idr_preload_end();
|
|
|
|
if (r < 0)
|
|
goto err_free;
|
|
|
|
minor->index = r;
|
|
|
|
minor->kdev = drm_sysfs_minor_alloc(minor);
|
|
if (IS_ERR(minor->kdev)) {
|
|
r = PTR_ERR(minor->kdev);
|
|
goto err_index;
|
|
}
|
|
|
|
*drm_minor_get_slot(dev, type) = minor;
|
|
return 0;
|
|
|
|
err_index:
|
|
spin_lock_irqsave(&drm_minor_lock, flags);
|
|
idr_remove(&drm_minors_idr, minor->index);
|
|
spin_unlock_irqrestore(&drm_minor_lock, flags);
|
|
err_free:
|
|
kfree(minor);
|
|
return r;
|
|
}
|
|
|
|
static void drm_minor_free(struct drm_device *dev, unsigned int type)
|
|
{
|
|
struct drm_minor **slot, *minor;
|
|
unsigned long flags;
|
|
|
|
slot = drm_minor_get_slot(dev, type);
|
|
minor = *slot;
|
|
if (!minor)
|
|
return;
|
|
|
|
put_device(minor->kdev);
|
|
|
|
spin_lock_irqsave(&drm_minor_lock, flags);
|
|
idr_remove(&drm_minors_idr, minor->index);
|
|
spin_unlock_irqrestore(&drm_minor_lock, flags);
|
|
|
|
kfree(minor);
|
|
*slot = NULL;
|
|
}
|
|
|
|
static int drm_minor_register(struct drm_device *dev, unsigned int type)
|
|
{
|
|
struct drm_minor *minor;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
DRM_DEBUG("\n");
|
|
|
|
minor = *drm_minor_get_slot(dev, type);
|
|
if (!minor)
|
|
return 0;
|
|
|
|
ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root);
|
|
if (ret) {
|
|
DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
|
|
goto err_debugfs;
|
|
}
|
|
|
|
ret = device_add(minor->kdev);
|
|
if (ret)
|
|
goto err_debugfs;
|
|
|
|
/* replace NULL with @minor so lookups will succeed from now on */
|
|
spin_lock_irqsave(&drm_minor_lock, flags);
|
|
idr_replace(&drm_minors_idr, minor, minor->index);
|
|
spin_unlock_irqrestore(&drm_minor_lock, flags);
|
|
|
|
DRM_DEBUG("new minor registered %d\n", minor->index);
|
|
return 0;
|
|
|
|
err_debugfs:
|
|
drm_debugfs_cleanup(minor);
|
|
return ret;
|
|
}
|
|
|
|
static void drm_minor_unregister(struct drm_device *dev, unsigned int type)
|
|
{
|
|
struct drm_minor *minor;
|
|
unsigned long flags;
|
|
|
|
minor = *drm_minor_get_slot(dev, type);
|
|
if (!minor || !device_is_registered(minor->kdev))
|
|
return;
|
|
|
|
/* replace @minor with NULL so lookups will fail from now on */
|
|
spin_lock_irqsave(&drm_minor_lock, flags);
|
|
idr_replace(&drm_minors_idr, NULL, minor->index);
|
|
spin_unlock_irqrestore(&drm_minor_lock, flags);
|
|
|
|
device_del(minor->kdev);
|
|
dev_set_drvdata(minor->kdev, NULL); /* safety belt */
|
|
drm_debugfs_cleanup(minor);
|
|
}
|
|
|
|
/*
|
|
* Looks up the given minor-ID and returns the respective DRM-minor object. The
|
|
* refence-count of the underlying device is increased so you must release this
|
|
* object with drm_minor_release().
|
|
*
|
|
* As long as you hold this minor, it is guaranteed that the object and the
|
|
* minor->dev pointer will stay valid! However, the device may get unplugged and
|
|
* unregistered while you hold the minor.
|
|
*/
|
|
struct drm_minor *drm_minor_acquire(unsigned int minor_id)
|
|
{
|
|
struct drm_minor *minor;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&drm_minor_lock, flags);
|
|
minor = idr_find(&drm_minors_idr, minor_id);
|
|
if (minor)
|
|
drm_dev_ref(minor->dev);
|
|
spin_unlock_irqrestore(&drm_minor_lock, flags);
|
|
|
|
if (!minor) {
|
|
return ERR_PTR(-ENODEV);
|
|
} else if (drm_device_is_unplugged(minor->dev)) {
|
|
drm_dev_unref(minor->dev);
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
return minor;
|
|
}
|
|
|
|
void drm_minor_release(struct drm_minor *minor)
|
|
{
|
|
drm_dev_unref(minor->dev);
|
|
}
|
|
|
|
/**
|
|
* DOC: driver instance overview
|
|
*
|
|
* A device instance for a drm driver is represented by &struct drm_device. This
|
|
* is allocated with drm_dev_alloc(), usually from bus-specific ->probe()
|
|
* callbacks implemented by the driver. The driver then needs to initialize all
|
|
* the various subsystems for the drm device like memory management, vblank
|
|
* handling, modesetting support and intial output configuration plus obviously
|
|
* initialize all the corresponding hardware bits. An important part of this is
|
|
* also calling drm_dev_set_unique() to set the userspace-visible unique name of
|
|
* this device instance. Finally when everything is up and running and ready for
|
|
* userspace the device instance can be published using drm_dev_register().
|
|
*
|
|
* There is also deprecated support for initalizing device instances using
|
|
* bus-specific helpers and the &drm_driver.load callback. But due to
|
|
* backwards-compatibility needs the device instance have to be published too
|
|
* early, which requires unpretty global locking to make safe and is therefore
|
|
* only support for existing drivers not yet converted to the new scheme.
|
|
*
|
|
* When cleaning up a device instance everything needs to be done in reverse:
|
|
* First unpublish the device instance with drm_dev_unregister(). Then clean up
|
|
* any other resources allocated at device initialization and drop the driver's
|
|
* reference to &drm_device using drm_dev_unref().
|
|
*
|
|
* Note that the lifetime rules for &drm_device instance has still a lot of
|
|
* historical baggage. Hence use the reference counting provided by
|
|
* drm_dev_ref() and drm_dev_unref() only carefully.
|
|
*
|
|
* It is recommended that drivers embed &struct drm_device into their own device
|
|
* structure, which is supported through drm_dev_init().
|
|
*/
|
|
|
|
/**
|
|
* drm_put_dev - Unregister and release a DRM device
|
|
* @dev: DRM device
|
|
*
|
|
* Called at module unload time or when a PCI device is unplugged.
|
|
*
|
|
* Cleans up all DRM device, calling drm_lastclose().
|
|
*
|
|
* Note: Use of this function is deprecated. It will eventually go away
|
|
* completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly
|
|
* instead to make sure that the device isn't userspace accessible any more
|
|
* while teardown is in progress, ensuring that userspace can't access an
|
|
* inconsistent state.
|
|
*/
|
|
void drm_put_dev(struct drm_device *dev)
|
|
{
|
|
DRM_DEBUG("\n");
|
|
|
|
if (!dev) {
|
|
DRM_ERROR("cleanup called no dev\n");
|
|
return;
|
|
}
|
|
|
|
drm_dev_unregister(dev);
|
|
drm_dev_unref(dev);
|
|
}
|
|
EXPORT_SYMBOL(drm_put_dev);
|
|
|
|
void drm_unplug_dev(struct drm_device *dev)
|
|
{
|
|
/* for a USB device */
|
|
if (drm_core_check_feature(dev, DRIVER_MODESET))
|
|
drm_modeset_unregister_all(dev);
|
|
|
|
drm_minor_unregister(dev, DRM_MINOR_PRIMARY);
|
|
drm_minor_unregister(dev, DRM_MINOR_RENDER);
|
|
drm_minor_unregister(dev, DRM_MINOR_CONTROL);
|
|
|
|
mutex_lock(&drm_global_mutex);
|
|
|
|
drm_device_set_unplugged(dev);
|
|
|
|
if (dev->open_count == 0) {
|
|
drm_put_dev(dev);
|
|
}
|
|
mutex_unlock(&drm_global_mutex);
|
|
}
|
|
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_init - Initialise new DRM device
|
|
* @dev: DRM device
|
|
* @driver: DRM driver
|
|
* @parent: Parent device object
|
|
*
|
|
* 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.
|
|
*
|
|
* Drivers that do not want to allocate their own device struct
|
|
* embedding &struct drm_device can call drm_dev_alloc() instead. For drivers
|
|
* that do embed &struct drm_device it must be placed first in the overall
|
|
* structure, and the overall structure must be allocated using kmalloc(): The
|
|
* drm core's release function unconditionally calls kfree() on the @dev pointer
|
|
* when the final reference is released. To override this behaviour, and so
|
|
* allow embedding of the drm_device inside the driver's device struct at an
|
|
* arbitrary offset, you must supply a &drm_driver.release callback and control
|
|
* the finalization explicitly.
|
|
*
|
|
* RETURNS:
|
|
* 0 on success, or error code on failure.
|
|
*/
|
|
int drm_dev_init(struct drm_device *dev,
|
|
struct drm_driver *driver,
|
|
struct device *parent)
|
|
{
|
|
int ret;
|
|
|
|
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->filelist_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_RENDER)) {
|
|
ret = drm_minor_alloc(dev, DRM_MINOR_RENDER);
|
|
if (ret)
|
|
goto err_minors;
|
|
}
|
|
|
|
ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY);
|
|
if (ret)
|
|
goto err_minors;
|
|
|
|
ret = drm_ht_create(&dev->map_hash, 12);
|
|
if (ret)
|
|
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;
|
|
}
|
|
}
|
|
|
|
/* Use the parent device name as DRM device unique identifier, but fall
|
|
* back to the driver name for virtual devices like vgem. */
|
|
ret = drm_dev_set_unique(dev, parent ? dev_name(parent) : driver->name);
|
|
if (ret)
|
|
goto err_setunique;
|
|
|
|
return 0;
|
|
|
|
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_PRIMARY);
|
|
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);
|
|
mutex_destroy(&dev->ctxlist_mutex);
|
|
mutex_destroy(&dev->filelist_mutex);
|
|
mutex_destroy(&dev->struct_mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_dev_init);
|
|
|
|
/**
|
|
* drm_dev_fini - Finalize a dead DRM device
|
|
* @dev: DRM device
|
|
*
|
|
* Finalize a dead DRM device. This is the converse to drm_dev_init() and
|
|
* frees up all data allocated by it. All driver private data should be
|
|
* finalized first. Note that this function does not free the @dev, that is
|
|
* left to the caller.
|
|
*
|
|
* The ref-count of @dev must be zero, and drm_dev_fini() should only be called
|
|
* from a &drm_driver.release callback.
|
|
*/
|
|
void drm_dev_fini(struct drm_device *dev)
|
|
{
|
|
drm_vblank_cleanup(dev);
|
|
|
|
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_PRIMARY);
|
|
drm_minor_free(dev, DRM_MINOR_RENDER);
|
|
drm_minor_free(dev, DRM_MINOR_CONTROL);
|
|
|
|
mutex_destroy(&dev->master_mutex);
|
|
mutex_destroy(&dev->ctxlist_mutex);
|
|
mutex_destroy(&dev->filelist_mutex);
|
|
mutex_destroy(&dev->struct_mutex);
|
|
kfree(dev->unique);
|
|
}
|
|
EXPORT_SYMBOL(drm_dev_fini);
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* Drivers that wish to subclass or embed &struct drm_device into their
|
|
* own struct should look at using drm_dev_init() instead.
|
|
*
|
|
* RETURNS:
|
|
* Pointer to new DRM device, or ERR_PTR on failure.
|
|
*/
|
|
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 ERR_PTR(-ENOMEM);
|
|
|
|
ret = drm_dev_init(dev, driver, parent);
|
|
if (ret) {
|
|
kfree(dev);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
return dev;
|
|
}
|
|
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 (dev->driver->release) {
|
|
dev->driver->release(dev);
|
|
} else {
|
|
drm_dev_fini(dev);
|
|
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);
|
|
|
|
static int create_compat_control_link(struct drm_device *dev)
|
|
{
|
|
struct drm_minor *minor;
|
|
char *name;
|
|
int ret;
|
|
|
|
if (!drm_core_check_feature(dev, DRIVER_MODESET))
|
|
return 0;
|
|
|
|
minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY);
|
|
if (!minor)
|
|
return 0;
|
|
|
|
/*
|
|
* Some existing userspace out there uses the existing of the controlD*
|
|
* sysfs files to figure out whether it's a modeset driver. It only does
|
|
* readdir, hence a symlink is sufficient (and the least confusing
|
|
* option). Otherwise controlD* is entirely unused.
|
|
*
|
|
* Old controlD chardev have been allocated in the range
|
|
* 64-127.
|
|
*/
|
|
name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64);
|
|
if (!name)
|
|
return -ENOMEM;
|
|
|
|
ret = sysfs_create_link(minor->kdev->kobj.parent,
|
|
&minor->kdev->kobj,
|
|
name);
|
|
|
|
kfree(name);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void remove_compat_control_link(struct drm_device *dev)
|
|
{
|
|
struct drm_minor *minor;
|
|
char *name;
|
|
|
|
if (!drm_core_check_feature(dev, DRIVER_MODESET))
|
|
return;
|
|
|
|
minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY);
|
|
if (!minor)
|
|
return;
|
|
|
|
name = kasprintf(GFP_KERNEL, "controlD%d", minor->index);
|
|
if (!name)
|
|
return;
|
|
|
|
sysfs_remove_link(minor->kdev->kobj.parent, name);
|
|
|
|
kfree(name);
|
|
}
|
|
|
|
/**
|
|
* 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 &drm_driver.load method after registering the device
|
|
* nodes, creating race conditions. Usage of the &drm_driver.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)
|
|
{
|
|
struct drm_driver *driver = dev->driver;
|
|
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_PRIMARY);
|
|
if (ret)
|
|
goto err_minors;
|
|
|
|
ret = create_compat_control_link(dev);
|
|
if (ret)
|
|
goto err_minors;
|
|
|
|
dev->registered = true;
|
|
|
|
if (dev->driver->load) {
|
|
ret = dev->driver->load(dev, flags);
|
|
if (ret)
|
|
goto err_minors;
|
|
}
|
|
|
|
if (drm_core_check_feature(dev, DRIVER_MODESET))
|
|
drm_modeset_register_all(dev);
|
|
|
|
ret = 0;
|
|
|
|
DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
|
|
driver->name, driver->major, driver->minor,
|
|
driver->patchlevel, driver->date,
|
|
dev->dev ? dev_name(dev->dev) : "virtual device",
|
|
dev->primary->index);
|
|
|
|
goto out_unlock;
|
|
|
|
err_minors:
|
|
remove_compat_control_link(dev);
|
|
drm_minor_unregister(dev, DRM_MINOR_PRIMARY);
|
|
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);
|
|
|
|
dev->registered = false;
|
|
|
|
if (drm_core_check_feature(dev, DRIVER_MODESET))
|
|
drm_modeset_unregister_all(dev);
|
|
|
|
if (dev->driver->unload)
|
|
dev->driver->unload(dev);
|
|
|
|
if (dev->agp)
|
|
drm_pci_agp_destroy(dev);
|
|
|
|
list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
|
|
drm_legacy_rmmap(dev, r_list->map);
|
|
|
|
remove_compat_control_link(dev);
|
|
drm_minor_unregister(dev, DRM_MINOR_PRIMARY);
|
|
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 void drm_core_exit(void)
|
|
{
|
|
unregister_chrdev(DRM_MAJOR, "drm");
|
|
debugfs_remove(drm_debugfs_root);
|
|
drm_sysfs_destroy();
|
|
idr_destroy(&drm_minors_idr);
|
|
drm_connector_ida_destroy();
|
|
drm_global_release();
|
|
}
|
|
|
|
static int __init drm_core_init(void)
|
|
{
|
|
int ret;
|
|
|
|
drm_global_init();
|
|
drm_connector_ida_init();
|
|
idr_init(&drm_minors_idr);
|
|
|
|
ret = drm_sysfs_init();
|
|
if (ret < 0) {
|
|
DRM_ERROR("Cannot create DRM class: %d\n", ret);
|
|
goto error;
|
|
}
|
|
|
|
drm_debugfs_root = debugfs_create_dir("dri", NULL);
|
|
if (!drm_debugfs_root) {
|
|
ret = -ENOMEM;
|
|
DRM_ERROR("Cannot create debugfs-root: %d\n", ret);
|
|
goto error;
|
|
}
|
|
|
|
ret = register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops);
|
|
if (ret < 0)
|
|
goto error;
|
|
|
|
DRM_DEBUG("Initialized\n");
|
|
return 0;
|
|
|
|
error:
|
|
drm_core_exit();
|
|
return ret;
|
|
}
|
|
|
|
module_init(drm_core_init);
|
|
module_exit(drm_core_exit);
|