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drm/debugfs: Add kerneldoc
I've decided to not document drm_debugfs_remove_files, it's on the way out. The biggest part is a huge todo.rst entry with what all should be improved. v2: Nits from Gabriel. Cc: Gabriel Krisman Bertazi <krisman@collabora.co.uk> Reviewed-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20170322205401.24897-1-daniel.vetter@ffwll.ch
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Daniel Vetter
parent
760f71e72e
commit
0cad7f71b5
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@ -210,6 +210,15 @@ Display CRC Support
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.. kernel-doc:: drivers/gpu/drm/drm_debugfs_crc.c
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:export:
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Debugfs Support
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---------------
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.. kernel-doc:: include/drm/drm_debugfs.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/drm_debugfs.c
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:export:
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VBlank event handling
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=====================
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@ -272,6 +272,32 @@ This is a really varied tasks with lots of little bits and pieces:
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Contact: Daniel Vetter
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Clean up the debugfs support
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----------------------------
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There's a bunch of issues with it:
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- The drm_info_list ->show() function doesn't even bother to cast to the drm
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structure for you. This is lazy.
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- We probably want to have some support for debugfs files on crtc/connectors and
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maybe other kms objects directly in core. There's even drm_print support in
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the funcs for these objects to dump kms state, so it's all there. And then the
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->show() functions should obviously give you a pointer to the right object.
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- The drm_info_list stuff is centered on drm_minor instead of drm_device. For
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anything we want to print drm_device (or maybe drm_file) is the right thing.
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- The drm_driver->debugfs_init hooks we have is just an artifact of the old
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midlayered load sequence. DRM debugfs should work more like sysfs, where you
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can create properties/files for an object anytime you want, and the core
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takes care of publishing/unpuplishing all the files at register/unregister
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time. Drivers shouldn't need to worry about these technicalities, and fixing
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this (together with the drm_minor->drm_device move) would allow us to remove
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debugfs_init.
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Contact: Daniel Vetter
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Better Testing
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==============
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@ -1,10 +1,3 @@
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/**
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* \file drm_debugfs.c
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* debugfs support for DRM
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*
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* \author Ben Gamari <bgamari@gmail.com>
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*/
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/*
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* Created: Sun Dec 21 13:08:50 2008 by bgamari@gmail.com
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*
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@ -75,16 +68,15 @@ static const struct file_operations drm_debugfs_fops = {
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/**
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* Initialize a given set of debugfs files for a device
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*
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* \param files The array of files to create
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* \param count The number of files given
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* \param root DRI debugfs dir entry.
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* \param minor device minor number
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* \return Zero on success, non-zero on failure
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* drm_debugfs_create_files - Initialize a given set of debugfs files for DRM
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* minor
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* @files: The array of files to create
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* @count: The number of files given
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* @root: DRI debugfs dir entry.
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* @minor: device minor number
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*
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* Create a given set of debugfs files represented by an array of
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* &drm_info_list in the given root directory. These files will be removed
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* &struct drm_info_list in the given root directory. These files will be removed
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* automatically on drm_debugfs_cleanup().
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*/
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int drm_debugfs_create_files(const struct drm_info_list *files, int count,
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@ -133,17 +125,6 @@ int drm_debugfs_create_files(const struct drm_info_list *files, int count,
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}
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EXPORT_SYMBOL(drm_debugfs_create_files);
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/**
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* Initialize the DRI debugfs filesystem for a device
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*
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* \param dev DRM device
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* \param minor device minor number
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* \param root DRI debugfs dir entry.
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*
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* Create the DRI debugfs root entry "/sys/kernel/debug/dri", the device debugfs root entry
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* "/sys/kernel/debug/dri/%minor%/", and each entry in debugfs_list as
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* "/sys/kernel/debug/dri/%minor%/%name%".
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*/
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int drm_debugfs_init(struct drm_minor *minor, int minor_id,
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struct dentry *root)
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{
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@ -189,16 +170,6 @@ int drm_debugfs_init(struct drm_minor *minor, int minor_id,
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}
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/**
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* Remove a list of debugfs files
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*
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* \param files The list of files
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* \param count The number of files
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* \param minor The minor of which we should remove the files
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* \return always zero.
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*
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* Remove all debugfs entries created by debugfs_init().
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*/
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int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
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struct drm_minor *minor)
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{
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@ -235,14 +206,6 @@ static void drm_debugfs_remove_all_files(struct drm_minor *minor)
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mutex_unlock(&minor->debugfs_lock);
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}
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/**
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* Cleanup the debugfs filesystem resources.
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*
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* \param minor device minor number.
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* \return always zero.
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*
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* Remove all debugfs entries created by debugfs_init().
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*/
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int drm_debugfs_cleanup(struct drm_minor *minor)
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{
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if (!minor->debugfs_root)
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@ -100,7 +100,7 @@ int drm_gem_open_ioctl(struct drm_device *dev, void *data,
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void drm_gem_open(struct drm_device *dev, struct drm_file *file_private);
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void drm_gem_release(struct drm_device *dev, struct drm_file *file_private);
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/* drm_debugfs.c */
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/* drm_debugfs.c drm_debugfs_crc.c */
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#if defined(CONFIG_DEBUG_FS)
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int drm_debugfs_init(struct drm_minor *minor, int minor_id,
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struct dentry *root);
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@ -33,23 +33,47 @@
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#define _DRM_DEBUGFS_H_
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/**
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* Info file list entry. This structure represents a debugfs or proc file to
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* be created by the drm core
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* struct drm_info_list - debugfs info list entry
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*
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* This structure represents a debugfs file to be created by the drm
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* core.
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*/
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struct drm_info_list {
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const char *name; /** file name */
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int (*show)(struct seq_file*, void*); /** show callback */
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u32 driver_features; /**< Required driver features for this entry */
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/** @name: file name */
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const char *name;
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/**
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* @show:
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*
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* Show callback. &seq_file->private will be set to the &struct
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* drm_info_node corresponding to the instance of this info on a given
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* &struct drm_minor.
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*/
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int (*show)(struct seq_file*, void*);
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/** @driver_features: Required driver features for this entry */
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u32 driver_features;
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/** @data: Driver-private data, should not be device-specific. */
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void *data;
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};
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/**
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* debugfs node structure. This structure represents a debugfs file.
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* struct drm_info_node - Per-minor debugfs node structure
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*
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* This structure represents a debugfs file, as an instantiation of a &struct
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* drm_info_list on a &struct drm_minor.
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*
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* FIXME:
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*
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* No it doesn't make a hole lot of sense that we duplicate debugfs entries for
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* both the render and the primary nodes, but that's how this has organically
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* grown. It should probably be fixed, with a compatibility link, if needed.
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*/
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struct drm_info_node {
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struct list_head list;
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/** @minor: &struct drm_minor for this node. */
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struct drm_minor *minor;
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/** @info_ent: template for this node. */
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const struct drm_info_list *info_ent;
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/* private: */
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struct list_head list;
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struct dentry *dent;
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};
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