[PATCH 5/5] drm/debugfs: rework drm_debugfs_create_files implementation
Christian König
ckoenig.leichtzumerken at gmail.com
Tue Jul 11 14:04:18 UTC 2023
Use managed memory allocation for this. That allows us to not keep
track of all the files any more.
Signed-off-by: Christian König <christian.koenig at amd.com>
---
drivers/accel/drm_accel.c | 2 -
drivers/gpu/drm/drm_debugfs.c | 75 +++++++++-------------------------
drivers/gpu/drm/drm_drv.c | 2 -
drivers/gpu/drm/drm_internal.h | 5 ---
drivers/gpu/drm/tegra/dc.c | 9 +++-
drivers/gpu/drm/tegra/dsi.c | 1 +
drivers/gpu/drm/tegra/hdmi.c | 3 +-
drivers/gpu/drm/tegra/sor.c | 1 +
include/drm/drm_debugfs.h | 4 +-
include/drm/drm_file.h | 4 --
10 files changed, 34 insertions(+), 72 deletions(-)
diff --git a/drivers/accel/drm_accel.c b/drivers/accel/drm_accel.c
index 82c5fcbbc164..02ccf6520d27 100644
--- a/drivers/accel/drm_accel.c
+++ b/drivers/accel/drm_accel.c
@@ -100,8 +100,6 @@ void accel_debugfs_register(struct drm_device *dev)
{
struct drm_minor *minor = dev->accel;
- INIT_LIST_HEAD(&minor->debugfs_list);
- mutex_init(&minor->debugfs_lock);
minor->debugfs_root = dev->debugfs_root;
drm_debugfs_create_files(accel_debugfs_list, ACCEL_DEBUGFS_ENTRIES,
diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
index d723143852e3..7aea06cb6be9 100644
--- a/drivers/gpu/drm/drm_debugfs.c
+++ b/drivers/gpu/drm/drm_debugfs.c
@@ -208,7 +208,7 @@ void drm_debugfs_create_files(const struct drm_info_list *files, int count,
if (features && !drm_core_check_all_features(dev, features))
continue;
- tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
+ tmp = drmm_kzalloc(dev, sizeof(*tmp), GFP_KERNEL);
if (tmp == NULL)
continue;
@@ -217,14 +217,28 @@ void drm_debugfs_create_files(const struct drm_info_list *files, int count,
0444, root, tmp,
&drm_debugfs_fops);
tmp->info_ent = &files[i];
-
- mutex_lock(&minor->debugfs_lock);
- list_add(&tmp->list, &minor->debugfs_list);
- mutex_unlock(&minor->debugfs_lock);
}
}
EXPORT_SYMBOL(drm_debugfs_create_files);
+int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
+ struct dentry *root, struct drm_minor *minor)
+{
+ int i;
+
+ for (i = 0; i < count; i++) {
+ struct dentry *dent = debugfs_lookup(files[i].name, root);
+
+ if (!dent)
+ continue;
+
+ drmm_kfree(minor->dev, d_inode(dent)->i_private);
+ debugfs_remove(dent);
+ }
+ return 0;
+}
+EXPORT_SYMBOL(drm_debugfs_remove_files);
+
/**
* drm_debugfs_dev_init - create debugfs directory for the device
* @dev: the device which we want to create the directory for
@@ -267,11 +281,8 @@ int drm_debugfs_register(struct drm_minor *minor, int minor_id,
struct drm_device *dev = minor->dev;
char name[64];
- INIT_LIST_HEAD(&minor->debugfs_list);
- mutex_init(&minor->debugfs_lock);
sprintf(name, "%d", minor_id);
- minor->debugfs_symlink = debugfs_create_symlink(name, root,
- dev->unique);
+ debugfs_create_symlink(name, root, dev->unique);
/* TODO: Only for compatibility with drivers */
minor->debugfs_root = dev->debugfs_root;
@@ -282,52 +293,6 @@ int drm_debugfs_register(struct drm_minor *minor, int minor_id,
return 0;
}
-int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
- struct drm_minor *minor)
-{
- struct list_head *pos, *q;
- struct drm_info_node *tmp;
- int i;
-
- mutex_lock(&minor->debugfs_lock);
- for (i = 0; i < count; i++) {
- list_for_each_safe(pos, q, &minor->debugfs_list) {
- tmp = list_entry(pos, struct drm_info_node, list);
- if (tmp->info_ent == &files[i]) {
- debugfs_remove(tmp->dent);
- list_del(pos);
- kfree(tmp);
- }
- }
- }
- mutex_unlock(&minor->debugfs_lock);
- return 0;
-}
-EXPORT_SYMBOL(drm_debugfs_remove_files);
-
-static void drm_debugfs_remove_all_files(struct drm_minor *minor)
-{
- struct drm_info_node *node, *tmp;
-
- mutex_lock(&minor->debugfs_lock);
- list_for_each_entry_safe(node, tmp, &minor->debugfs_list, list) {
- debugfs_remove(node->dent);
- list_del(&node->list);
- kfree(node);
- }
- mutex_unlock(&minor->debugfs_lock);
-}
-
-void drm_debugfs_cleanup(struct drm_minor *minor)
-{
- if (!minor->debugfs_symlink)
- return;
-
- drm_debugfs_remove_all_files(minor);
- debugfs_remove(minor->debugfs_symlink);
- minor->debugfs_symlink = NULL;
-}
-
/**
* drm_debugfs_add_file - Add a given file to the DRM device debugfs file list
* @dev: drm device for the ioctl
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 521d3d75a585..3d5eaea12922 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -198,7 +198,6 @@ static int drm_minor_register(struct drm_device *dev, unsigned int type)
return 0;
err_debugfs:
- drm_debugfs_cleanup(minor);
return ret;
}
@@ -222,7 +221,6 @@ static void drm_minor_unregister(struct drm_device *dev, unsigned int type)
device_del(minor->kdev);
dev_set_drvdata(minor->kdev, NULL); /* safety belt */
- drm_debugfs_cleanup(minor);
}
/*
diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
index 5a98fd1613ee..a8f20fd58b50 100644
--- a/drivers/gpu/drm/drm_internal.h
+++ b/drivers/gpu/drm/drm_internal.h
@@ -184,7 +184,6 @@ void drm_debugfs_dev_fini(struct drm_device *dev);
void drm_debugfs_dev_register(struct drm_device *dev);
int drm_debugfs_register(struct drm_minor *minor, int minor_id,
struct dentry *root);
-void drm_debugfs_cleanup(struct drm_minor *minor);
void drm_debugfs_connector_add(struct drm_connector *connector);
void drm_debugfs_connector_remove(struct drm_connector *connector);
void drm_debugfs_crtc_add(struct drm_crtc *crtc);
@@ -205,10 +204,6 @@ static inline int drm_debugfs_register(struct drm_minor *minor, int minor_id,
return 0;
}
-static inline void drm_debugfs_cleanup(struct drm_minor *minor)
-{
-}
-
static inline void drm_debugfs_connector_add(struct drm_connector *connector)
{
}
diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index 6e78416e64b0..d7fdc63a6632 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -1745,8 +1745,15 @@ static void tegra_dc_early_unregister(struct drm_crtc *crtc)
unsigned int count = ARRAY_SIZE(debugfs_files);
struct drm_minor *minor = crtc->dev->primary;
struct tegra_dc *dc = to_tegra_dc(crtc);
+ struct dentry *root;
+
+#ifdef CONFIG_DEBUG_FS
+ root = crtc->debugfs_entry;
+#else
+ root = NULL;
+#endif
- drm_debugfs_remove_files(dc->debugfs_files, count, minor);
+ drm_debugfs_remove_files(dc->debugfs_files, count, root, minor);
kfree(dc->debugfs_files);
dc->debugfs_files = NULL;
}
diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c
index a9870c828374..fbfe92a816d4 100644
--- a/drivers/gpu/drm/tegra/dsi.c
+++ b/drivers/gpu/drm/tegra/dsi.c
@@ -256,6 +256,7 @@ static void tegra_dsi_early_unregister(struct drm_connector *connector)
struct tegra_dsi *dsi = to_dsi(output);
drm_debugfs_remove_files(dsi->debugfs_files, count,
+ connector->debugfs_entry,
connector->dev->primary);
kfree(dsi->debugfs_files);
dsi->debugfs_files = NULL;
diff --git a/drivers/gpu/drm/tegra/hdmi.c b/drivers/gpu/drm/tegra/hdmi.c
index 6eac54ae1205..d953d0a0325a 100644
--- a/drivers/gpu/drm/tegra/hdmi.c
+++ b/drivers/gpu/drm/tegra/hdmi.c
@@ -1114,7 +1114,8 @@ static void tegra_hdmi_early_unregister(struct drm_connector *connector)
unsigned int count = ARRAY_SIZE(debugfs_files);
struct tegra_hdmi *hdmi = to_hdmi(output);
- drm_debugfs_remove_files(hdmi->debugfs_files, count, minor);
+ drm_debugfs_remove_files(hdmi->debugfs_files, count,
+ connector->debugfs_entry, minor);
kfree(hdmi->debugfs_files);
hdmi->debugfs_files = NULL;
}
diff --git a/drivers/gpu/drm/tegra/sor.c b/drivers/gpu/drm/tegra/sor.c
index fbb63d755496..b45c569e6a0b 100644
--- a/drivers/gpu/drm/tegra/sor.c
+++ b/drivers/gpu/drm/tegra/sor.c
@@ -1707,6 +1707,7 @@ static void tegra_sor_early_unregister(struct drm_connector *connector)
struct tegra_sor *sor = to_sor(output);
drm_debugfs_remove_files(sor->debugfs_files, count,
+ connector->debugfs_entry,
connector->dev->primary);
kfree(sor->debugfs_files);
sor->debugfs_files = NULL;
diff --git a/include/drm/drm_debugfs.h b/include/drm/drm_debugfs.h
index 7616f457ce70..84ee27dc2317 100644
--- a/include/drm/drm_debugfs.h
+++ b/include/drm/drm_debugfs.h
@@ -126,8 +126,8 @@ struct drm_debugfs_entry {
void drm_debugfs_create_files(const struct drm_info_list *files,
int count, struct dentry *root,
struct drm_minor *minor);
-int drm_debugfs_remove_files(const struct drm_info_list *files,
- int count, struct drm_minor *minor);
+int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
+ struct dentry *root, struct drm_minor *minor);
void drm_debugfs_add_file(struct drm_device *dev, const char *name,
int (*show)(struct seq_file*, void*), void *data);
diff --git a/include/drm/drm_file.h b/include/drm/drm_file.h
index 016fb715b9b6..ccdc793a8264 100644
--- a/include/drm/drm_file.h
+++ b/include/drm/drm_file.h
@@ -79,11 +79,7 @@ struct drm_minor {
struct device *kdev; /* Linux device */
struct drm_device *dev;
- struct dentry *debugfs_symlink;
struct dentry *debugfs_root;
-
- struct list_head debugfs_list;
- struct mutex debugfs_lock; /* Protects debugfs_list. */
};
/**
--
2.34.1
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