mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
8f5c7aa078
It's nice if a big function/ioctl table like this is const. Only downside here is that we need a few more #ifdef to paper over the differences when CONFIG_DRM_LEGACY is enabled. Maybe provides more motivation to sunset that horror show :-) v2: - Fix super important checkpatch warning (Sam) - Update the kerneldoc example too (Sam) Acked-by: Maxime Ripard <mripard@kernel.org> Reviewed-by: Sam Ravnborg <sam@ravnborg.org> Acked-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Maxime Ripard <mripard@kernel.org> Cc: Thomas Zimmermann <tzimmermann@suse.de> Cc: David Airlie <airlied@linux.ie> Cc: Daniel Vetter <daniel@ffwll.ch> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20201104100425.1922351-4-daniel.vetter@ffwll.ch
1077 lines
29 KiB
C
1077 lines
29 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/pseudo_fs.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/srcu.h>
|
|
|
|
#include <drm/drm_client.h>
|
|
#include <drm/drm_color_mgmt.h>
|
|
#include <drm/drm_drv.h>
|
|
#include <drm/drm_file.h>
|
|
#include <drm/drm_managed.h>
|
|
#include <drm/drm_mode_object.h>
|
|
#include <drm/drm_print.h>
|
|
|
|
#include "drm_crtc_internal.h"
|
|
#include "drm_internal.h"
|
|
#include "drm_legacy.h"
|
|
|
|
MODULE_AUTHOR("Gareth Hughes, Leif Delgass, José Fonseca, Jon Smirl");
|
|
MODULE_DESCRIPTION("DRM shared core routines");
|
|
MODULE_LICENSE("GPL and additional rights");
|
|
|
|
static DEFINE_SPINLOCK(drm_minor_lock);
|
|
static struct idr drm_minors_idr;
|
|
|
|
/*
|
|
* If the drm core fails to init for whatever reason,
|
|
* we should prevent any drivers from registering with it.
|
|
* It's best to check this at drm_dev_init(), as some drivers
|
|
* prefer to embed struct drm_device into their own device
|
|
* structure and call drm_dev_init() themselves.
|
|
*/
|
|
static bool drm_core_init_complete = false;
|
|
|
|
static struct dentry *drm_debugfs_root;
|
|
|
|
DEFINE_STATIC_SRCU(drm_unplug_srcu);
|
|
|
|
/*
|
|
* 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;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
static void drm_minor_alloc_release(struct drm_device *dev, void *data)
|
|
{
|
|
struct drm_minor *minor = data;
|
|
unsigned long flags;
|
|
|
|
WARN_ON(dev != minor->dev);
|
|
|
|
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);
|
|
}
|
|
|
|
static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
|
|
{
|
|
struct drm_minor *minor;
|
|
unsigned long flags;
|
|
int r;
|
|
|
|
minor = drmm_kzalloc(dev, 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)
|
|
return r;
|
|
|
|
minor->index = r;
|
|
|
|
r = drmm_add_action_or_reset(dev, drm_minor_alloc_release, minor);
|
|
if (r)
|
|
return r;
|
|
|
|
minor->kdev = drm_sysfs_minor_alloc(minor);
|
|
if (IS_ERR(minor->kdev))
|
|
return PTR_ERR(minor->kdev);
|
|
|
|
*drm_minor_get_slot(dev, type) = minor;
|
|
return 0;
|
|
}
|
|
|
|
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_get(minor->dev);
|
|
spin_unlock_irqrestore(&drm_minor_lock, flags);
|
|
|
|
if (!minor) {
|
|
return ERR_PTR(-ENODEV);
|
|
} else if (drm_dev_is_unplugged(minor->dev)) {
|
|
drm_dev_put(minor->dev);
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
return minor;
|
|
}
|
|
|
|
void drm_minor_release(struct drm_minor *minor)
|
|
{
|
|
drm_dev_put(minor->dev);
|
|
}
|
|
|
|
/**
|
|
* DOC: driver instance overview
|
|
*
|
|
* A device instance for a drm driver is represented by &struct drm_device. This
|
|
* is allocated and initialized with devm_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 initial output
|
|
* configuration plus obviously initialize all the corresponding hardware bits.
|
|
* 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_put().
|
|
*
|
|
* Note that any allocation or resource which is visible to userspace must be
|
|
* released only when the final drm_dev_put() is called, and not when the
|
|
* driver is unbound from the underlying physical struct &device. Best to use
|
|
* &drm_device managed resources with drmm_add_action(), drmm_kmalloc() and
|
|
* related functions.
|
|
*
|
|
* devres managed resources like devm_kmalloc() can only be used for resources
|
|
* directly related to the underlying hardware device, and only used in code
|
|
* paths fully protected by drm_dev_enter() and drm_dev_exit().
|
|
*
|
|
* Display driver example
|
|
* ~~~~~~~~~~~~~~~~~~~~~~
|
|
*
|
|
* The following example shows a typical structure of a DRM display driver.
|
|
* The example focus on the probe() function and the other functions that is
|
|
* almost always present and serves as a demonstration of devm_drm_dev_alloc().
|
|
*
|
|
* .. code-block:: c
|
|
*
|
|
* struct driver_device {
|
|
* struct drm_device drm;
|
|
* void *userspace_facing;
|
|
* struct clk *pclk;
|
|
* };
|
|
*
|
|
* static const struct drm_driver driver_drm_driver = {
|
|
* [...]
|
|
* };
|
|
*
|
|
* static int driver_probe(struct platform_device *pdev)
|
|
* {
|
|
* struct driver_device *priv;
|
|
* struct drm_device *drm;
|
|
* int ret;
|
|
*
|
|
* priv = devm_drm_dev_alloc(&pdev->dev, &driver_drm_driver,
|
|
* struct driver_device, drm);
|
|
* if (IS_ERR(priv))
|
|
* return PTR_ERR(priv);
|
|
* drm = &priv->drm;
|
|
*
|
|
* ret = drmm_mode_config_init(drm);
|
|
* if (ret)
|
|
* return ret;
|
|
*
|
|
* priv->userspace_facing = drmm_kzalloc(..., GFP_KERNEL);
|
|
* if (!priv->userspace_facing)
|
|
* return -ENOMEM;
|
|
*
|
|
* priv->pclk = devm_clk_get(dev, "PCLK");
|
|
* if (IS_ERR(priv->pclk))
|
|
* return PTR_ERR(priv->pclk);
|
|
*
|
|
* // Further setup, display pipeline etc
|
|
*
|
|
* platform_set_drvdata(pdev, drm);
|
|
*
|
|
* drm_mode_config_reset(drm);
|
|
*
|
|
* ret = drm_dev_register(drm);
|
|
* if (ret)
|
|
* return ret;
|
|
*
|
|
* drm_fbdev_generic_setup(drm, 32);
|
|
*
|
|
* return 0;
|
|
* }
|
|
*
|
|
* // This function is called before the devm_ resources are released
|
|
* static int driver_remove(struct platform_device *pdev)
|
|
* {
|
|
* struct drm_device *drm = platform_get_drvdata(pdev);
|
|
*
|
|
* drm_dev_unregister(drm);
|
|
* drm_atomic_helper_shutdown(drm)
|
|
*
|
|
* return 0;
|
|
* }
|
|
*
|
|
* // This function is called on kernel restart and shutdown
|
|
* static void driver_shutdown(struct platform_device *pdev)
|
|
* {
|
|
* drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
|
|
* }
|
|
*
|
|
* static int __maybe_unused driver_pm_suspend(struct device *dev)
|
|
* {
|
|
* return drm_mode_config_helper_suspend(dev_get_drvdata(dev));
|
|
* }
|
|
*
|
|
* static int __maybe_unused driver_pm_resume(struct device *dev)
|
|
* {
|
|
* drm_mode_config_helper_resume(dev_get_drvdata(dev));
|
|
*
|
|
* return 0;
|
|
* }
|
|
*
|
|
* static const struct dev_pm_ops driver_pm_ops = {
|
|
* SET_SYSTEM_SLEEP_PM_OPS(driver_pm_suspend, driver_pm_resume)
|
|
* };
|
|
*
|
|
* static struct platform_driver driver_driver = {
|
|
* .driver = {
|
|
* [...]
|
|
* .pm = &driver_pm_ops,
|
|
* },
|
|
* .probe = driver_probe,
|
|
* .remove = driver_remove,
|
|
* .shutdown = driver_shutdown,
|
|
* };
|
|
* module_platform_driver(driver_driver);
|
|
*
|
|
* Drivers that want to support device unplugging (USB, DT overlay unload) should
|
|
* use drm_dev_unplug() instead of drm_dev_unregister(). The driver must protect
|
|
* regions that is accessing device resources to prevent use after they're
|
|
* released. This is done using drm_dev_enter() and drm_dev_exit(). There is one
|
|
* shortcoming however, drm_dev_unplug() marks the drm_device as unplugged before
|
|
* drm_atomic_helper_shutdown() is called. This means that if the disable code
|
|
* paths are protected, they will not run on regular driver module unload,
|
|
* possibily leaving the hardware enabled.
|
|
*/
|
|
|
|
/**
|
|
* 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_put() 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_put(dev);
|
|
}
|
|
EXPORT_SYMBOL(drm_put_dev);
|
|
|
|
/**
|
|
* drm_dev_enter - Enter device critical section
|
|
* @dev: DRM device
|
|
* @idx: Pointer to index that will be passed to the matching drm_dev_exit()
|
|
*
|
|
* This function marks and protects the beginning of a section that should not
|
|
* be entered after the device has been unplugged. The section end is marked
|
|
* with drm_dev_exit(). Calls to this function can be nested.
|
|
*
|
|
* Returns:
|
|
* True if it is OK to enter the section, false otherwise.
|
|
*/
|
|
bool drm_dev_enter(struct drm_device *dev, int *idx)
|
|
{
|
|
*idx = srcu_read_lock(&drm_unplug_srcu);
|
|
|
|
if (dev->unplugged) {
|
|
srcu_read_unlock(&drm_unplug_srcu, *idx);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL(drm_dev_enter);
|
|
|
|
/**
|
|
* drm_dev_exit - Exit device critical section
|
|
* @idx: index returned from drm_dev_enter()
|
|
*
|
|
* This function marks the end of a section that should not be entered after
|
|
* the device has been unplugged.
|
|
*/
|
|
void drm_dev_exit(int idx)
|
|
{
|
|
srcu_read_unlock(&drm_unplug_srcu, idx);
|
|
}
|
|
EXPORT_SYMBOL(drm_dev_exit);
|
|
|
|
/**
|
|
* drm_dev_unplug - unplug a DRM device
|
|
* @dev: DRM device
|
|
*
|
|
* This unplugs a hotpluggable DRM device, which makes it inaccessible to
|
|
* userspace operations. Entry-points can use drm_dev_enter() and
|
|
* drm_dev_exit() to protect device resources in a race free manner. This
|
|
* essentially unregisters the device like drm_dev_unregister(), but can be
|
|
* called while there are still open users of @dev.
|
|
*/
|
|
void drm_dev_unplug(struct drm_device *dev)
|
|
{
|
|
/*
|
|
* After synchronizing any critical read section is guaranteed to see
|
|
* the new value of ->unplugged, and any critical section which might
|
|
* still have seen the old value of ->unplugged is guaranteed to have
|
|
* finished.
|
|
*/
|
|
dev->unplugged = true;
|
|
synchronize_srcu(&drm_unplug_srcu);
|
|
|
|
drm_dev_unregister(dev);
|
|
}
|
|
EXPORT_SYMBOL(drm_dev_unplug);
|
|
|
|
/*
|
|
* 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 int drm_fs_init_fs_context(struct fs_context *fc)
|
|
{
|
|
return init_pseudo(fc, 0x010203ff) ? 0 : -ENOMEM;
|
|
}
|
|
|
|
static struct file_system_type drm_fs_type = {
|
|
.name = "drm",
|
|
.owner = THIS_MODULE,
|
|
.init_fs_context = drm_fs_init_fs_context,
|
|
.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);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* DOC: component helper usage recommendations
|
|
*
|
|
* DRM drivers that drive hardware where a logical device consists of a pile of
|
|
* independent hardware blocks are recommended to use the :ref:`component helper
|
|
* library<component>`. For consistency and better options for code reuse the
|
|
* following guidelines apply:
|
|
*
|
|
* - The entire device initialization procedure should be run from the
|
|
* &component_master_ops.master_bind callback, starting with
|
|
* devm_drm_dev_alloc(), then binding all components with
|
|
* component_bind_all() and finishing with drm_dev_register().
|
|
*
|
|
* - The opaque pointer passed to all components through component_bind_all()
|
|
* should point at &struct drm_device of the device instance, not some driver
|
|
* specific private structure.
|
|
*
|
|
* - The component helper fills the niche where further standardization of
|
|
* interfaces is not practical. When there already is, or will be, a
|
|
* standardized interface like &drm_bridge or &drm_panel, providing its own
|
|
* functions to find such components at driver load time, like
|
|
* drm_of_find_panel_or_bridge(), then the component helper should not be
|
|
* used.
|
|
*/
|
|
|
|
static void drm_dev_init_release(struct drm_device *dev, void *res)
|
|
{
|
|
drm_legacy_ctxbitmap_cleanup(dev);
|
|
drm_legacy_remove_map_hash(dev);
|
|
drm_fs_inode_free(dev->anon_inode);
|
|
|
|
put_device(dev->dev);
|
|
/* Prevent use-after-free in drm_managed_release when debugging is
|
|
* enabled. Slightly awkward, but can't really be helped. */
|
|
dev->dev = NULL;
|
|
mutex_destroy(&dev->master_mutex);
|
|
mutex_destroy(&dev->clientlist_mutex);
|
|
mutex_destroy(&dev->filelist_mutex);
|
|
mutex_destroy(&dev->struct_mutex);
|
|
drm_legacy_destroy_members(dev);
|
|
}
|
|
|
|
static int drm_dev_init(struct drm_device *dev,
|
|
const struct drm_driver *driver,
|
|
struct device *parent)
|
|
{
|
|
int ret;
|
|
|
|
if (!drm_core_init_complete) {
|
|
DRM_ERROR("DRM core is not initialized\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (WARN_ON(!parent))
|
|
return -EINVAL;
|
|
|
|
kref_init(&dev->ref);
|
|
dev->dev = get_device(parent);
|
|
#ifdef CONFIG_DRM_LEGACY
|
|
dev->driver = (struct drm_driver *)driver;
|
|
#else
|
|
dev->driver = driver;
|
|
#endif
|
|
|
|
INIT_LIST_HEAD(&dev->managed.resources);
|
|
spin_lock_init(&dev->managed.lock);
|
|
|
|
/* no per-device feature limits by default */
|
|
dev->driver_features = ~0u;
|
|
|
|
drm_legacy_init_members(dev);
|
|
INIT_LIST_HEAD(&dev->filelist);
|
|
INIT_LIST_HEAD(&dev->filelist_internal);
|
|
INIT_LIST_HEAD(&dev->clientlist);
|
|
INIT_LIST_HEAD(&dev->vblank_event_list);
|
|
|
|
spin_lock_init(&dev->event_lock);
|
|
mutex_init(&dev->struct_mutex);
|
|
mutex_init(&dev->filelist_mutex);
|
|
mutex_init(&dev->clientlist_mutex);
|
|
mutex_init(&dev->master_mutex);
|
|
|
|
ret = drmm_add_action(dev, drm_dev_init_release, NULL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
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;
|
|
}
|
|
|
|
if (drm_core_check_feature(dev, DRIVER_RENDER)) {
|
|
ret = drm_minor_alloc(dev, DRM_MINOR_RENDER);
|
|
if (ret)
|
|
goto err;
|
|
}
|
|
|
|
ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY);
|
|
if (ret)
|
|
goto err;
|
|
|
|
ret = drm_legacy_create_map_hash(dev);
|
|
if (ret)
|
|
goto err;
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
ret = drm_dev_set_unique(dev, dev_name(parent));
|
|
if (ret)
|
|
goto err;
|
|
|
|
return 0;
|
|
|
|
err:
|
|
drm_managed_release(dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void devm_drm_dev_init_release(void *data)
|
|
{
|
|
drm_dev_put(data);
|
|
}
|
|
|
|
static int devm_drm_dev_init(struct device *parent,
|
|
struct drm_device *dev,
|
|
const struct drm_driver *driver)
|
|
{
|
|
int ret;
|
|
|
|
ret = drm_dev_init(dev, driver, parent);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = devm_add_action(parent, devm_drm_dev_init_release, dev);
|
|
if (ret)
|
|
devm_drm_dev_init_release(dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void *__devm_drm_dev_alloc(struct device *parent,
|
|
const struct drm_driver *driver,
|
|
size_t size, size_t offset)
|
|
{
|
|
void *container;
|
|
struct drm_device *drm;
|
|
int ret;
|
|
|
|
container = kzalloc(size, GFP_KERNEL);
|
|
if (!container)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
drm = container + offset;
|
|
ret = devm_drm_dev_init(parent, drm, driver);
|
|
if (ret) {
|
|
kfree(container);
|
|
return ERR_PTR(ret);
|
|
}
|
|
drmm_add_final_kfree(drm, container);
|
|
|
|
return container;
|
|
}
|
|
EXPORT_SYMBOL(__devm_drm_dev_alloc);
|
|
|
|
/**
|
|
* drm_dev_alloc - Allocate new DRM device
|
|
* @driver: DRM driver to allocate device for
|
|
* @parent: Parent device object
|
|
*
|
|
* This is the deprecated version of devm_drm_dev_alloc(), which does not support
|
|
* subclassing through embedding the struct &drm_device in a driver private
|
|
* structure, and which does not support automatic cleanup through devres.
|
|
*
|
|
* RETURNS:
|
|
* Pointer to new DRM device, or ERR_PTR on failure.
|
|
*/
|
|
struct drm_device *drm_dev_alloc(const 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);
|
|
}
|
|
|
|
drmm_add_final_kfree(dev, dev);
|
|
|
|
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);
|
|
|
|
drm_managed_release(dev);
|
|
|
|
kfree(dev->managed.final_kfree);
|
|
}
|
|
|
|
/**
|
|
* drm_dev_get - 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_put() 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_get(struct drm_device *dev)
|
|
{
|
|
if (dev)
|
|
kref_get(&dev->ref);
|
|
}
|
|
EXPORT_SYMBOL(drm_dev_get);
|
|
|
|
/**
|
|
* drm_dev_put - 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_put(struct drm_device *dev)
|
|
{
|
|
if (dev)
|
|
kref_put(&dev->ref, drm_dev_release);
|
|
}
|
|
EXPORT_SYMBOL(drm_dev_put);
|
|
|
|
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 + 64);
|
|
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 initialized via drm_dev_init()
|
|
* 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)
|
|
{
|
|
const struct drm_driver *driver = dev->driver;
|
|
int ret;
|
|
|
|
if (!driver->load)
|
|
drm_mode_config_validate(dev);
|
|
|
|
WARN_ON(!dev->managed.final_kfree);
|
|
|
|
if (drm_dev_needs_global_mutex(dev))
|
|
mutex_lock(&drm_global_mutex);
|
|
|
|
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);
|
|
out_unlock:
|
|
if (drm_dev_needs_global_mutex(dev))
|
|
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_put() to drop their final reference.
|
|
*
|
|
* A special form of unregistering for hotpluggable devices is drm_dev_unplug(),
|
|
* which can be called while there are still open users of @dev.
|
|
*
|
|
* 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)
|
|
{
|
|
if (drm_core_check_feature(dev, DRIVER_LEGACY))
|
|
drm_lastclose(dev);
|
|
|
|
dev->registered = false;
|
|
|
|
drm_client_dev_unregister(dev);
|
|
|
|
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);
|
|
|
|
drm_legacy_rmmaps(dev);
|
|
|
|
remove_compat_control_link(dev);
|
|
drm_minor_unregister(dev, DRM_MINOR_PRIMARY);
|
|
drm_minor_unregister(dev, DRM_MINOR_RENDER);
|
|
}
|
|
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. This is
|
|
* already done by drm_dev_init(), drivers should only override the default
|
|
* unique name for backwards compatibility reasons.
|
|
*
|
|
* Return: 0 on success or a negative error code on failure.
|
|
*/
|
|
int drm_dev_set_unique(struct drm_device *dev, const char *name)
|
|
{
|
|
drmm_kfree(dev, dev->unique);
|
|
dev->unique = drmm_kstrdup(dev, 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");
|
|
|
|
minor = drm_minor_acquire(iminor(inode));
|
|
if (IS_ERR(minor))
|
|
return PTR_ERR(minor);
|
|
|
|
new_fops = fops_get(minor->dev->driver->fops);
|
|
if (!new_fops) {
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
replace_fops(filp, new_fops);
|
|
if (filp->f_op->open)
|
|
err = filp->f_op->open(inode, filp);
|
|
else
|
|
err = 0;
|
|
|
|
out:
|
|
drm_minor_release(minor);
|
|
|
|
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();
|
|
}
|
|
|
|
static int __init drm_core_init(void)
|
|
{
|
|
int ret;
|
|
|
|
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);
|
|
|
|
ret = register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops);
|
|
if (ret < 0)
|
|
goto error;
|
|
|
|
drm_core_init_complete = true;
|
|
|
|
DRM_DEBUG("Initialized\n");
|
|
return 0;
|
|
|
|
error:
|
|
drm_core_exit();
|
|
return ret;
|
|
}
|
|
|
|
module_init(drm_core_init);
|
|
module_exit(drm_core_exit);
|