From: Swati Dhingra <swati.dhin...@intel.com>
During drm module initialization, drm_core_init initializes the drmfs
filesystem and register this with kernel. A driver specific directory is created
inside drmfs root, and dentry of this directory is saved for subsequent use
by the driver (e.g. i915). The driver can then create files/directories inside
this root directory directly.
In case of i915 driver, the top directory is created at '/sys/kernel/drm/i915'.
Signed-off-by: Sourab Gupta <sourab.gu...@intel.com>
Signed-off-by: Swati Dhingra <swati.dhin...@intel.com>
---
drivers/gpu/drm/drm_drv.c | 22 ++++++++++++++++++++++
include/drm/drm_drv.h | 3 +++
2 files changed, 25 insertions(+)
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 84fcfcb..ead360bd 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -688,6 +688,14 @@ int drm_dev_register(struct drm_device *dev, unsigned long
flags)
{
int ret;
+#ifdef CONFIG_DRMFS
+ dev->driver->drmfs_root = drmfs_create_dir(dev->driver->name, NULL);
+ if (IS_ERR(dev->driver->drmfs_root)) {
+ DRM_ERROR("Failed to get drmfs root dentry\n");
+ return PTR_ERR(dev->driver->drmfs_root);
+ }
+#endif
+
mutex_lock(&drm_global_mutex);
ret = drm_minor_register(dev, DRM_MINOR_CONTROL);
@@ -758,6 +766,9 @@ void drm_dev_unregister(struct drm_device *dev)
drm_minor_unregister(dev, DRM_MINOR_PRIMARY);
drm_minor_unregister(dev, DRM_MINOR_RENDER);
drm_minor_unregister(dev, DRM_MINOR_CONTROL);
+#ifdef CONFIG_DRMFS
+ drmfs_remove(dev->driver->drmfs_root);
+#endif
}
EXPORT_SYMBOL(drm_dev_unregister);
@@ -825,6 +836,9 @@ static void drm_core_exit(void)
{
unregister_chrdev(DRM_MAJOR, "drm");
debugfs_remove(drm_debugfs_root);
+#ifdef CONFIG_DRMFS
+ drmfs_fini();
+#endif
drm_sysfs_destroy();
idr_destroy(&drm_minors_idr);
drm_connector_ida_destroy();
@@ -845,6 +859,14 @@ static int __init drm_core_init(void)
goto error;
}
+#ifdef CONFIG_DRMFS
+ ret = drmfs_init();
+ if (ret < 0) {
+ DRM_ERROR("Cannot create DRM FS: %d\n", ret);
+ goto error;
+ }
+#endif
+
drm_debugfs_root = debugfs_create_dir("dri", NULL);
if (!drm_debugfs_root) {
ret = -ENOMEM;
diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index aad8bba..34804de 100644
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -403,6 +403,9 @@ struct drm_driver {
/* List of devices hanging off this driver with stealth attach. */
struct list_head legacy_dev_list;
+
+ /* drmfs parent directory dentry for this driver */
+ struct dentry *drmfs_root;
};
extern __printf(6, 7)
--
2.7.4
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