Sometimes we need to create a struct file to wrap a drm_device, as it
the user were to have opened /dev/dri/card0 but to do so anonymously
(i.e. for internal use). Provide a utility method to create a struct
file with the drm_device->driver.fops, that wrap the drm_device.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_file.c | 39 ++++++++++++++++++++++++++++++++++++++
include/drm/drm_file.h | 3 +++
2 files changed, 42 insertions(+)
diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c
index ea34bc991858..cc55c0cd5826 100644
--- a/drivers/gpu/drm/drm_file.c
+++ b/drivers/gpu/drm/drm_file.c
@@ -31,7 +31,9 @@
* OTHER DEALINGS IN THE SOFTWARE.
*/
+#include <linux/anon_inodes.h>
#include <linux/dma-fence.h>
+#include <linux/file.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/poll.h>
@@ -754,3 +756,40 @@ void drm_send_event(struct drm_device *dev, struct drm_pending_event *e)
spin_unlock_irqrestore(&dev->event_lock, irqflags);
}
EXPORT_SYMBOL(drm_send_event);
+
+/**
+ * anon_drm_getfile - Create a new struct file for the drm device
+ * @minor: drm minor to wrap (e.g. drm_device->primary)
+ * @flags: file creation mode (O_RDWR etc)
+ *
+ * This create a new struct file that wraps a DRM file context around a
+ * DRM minor. This mimicks userspace opening e.g. /dev/dri/card0, but without
+ * invoking userspace. The struct file may be operated on using its f_op
+ * (the drm_device.driver.fops) to mimick userspace operations, or be supplied
+ * to userspace facing functions as an internal/anonymous client.
+ *
+ * RETURNS:
+ * Pointer to newly created struct file, ERR_PTR on failure.
+ */
+struct file *anon_drm_getfile(struct drm_minor *minor, unsigned int flags)
+{
+ struct drm_device *dev = minor->dev;
+ struct drm_file *priv;
+ struct file *file;
+
+ priv = drm_file_alloc(minor);
+ if (IS_ERR(priv))
+ return ERR_CAST(priv);
+
+ file = anon_inode_getfile("drm", dev->driver->fops, priv, flags);
+ if (IS_ERR(file)) {
+ drm_file_free(priv);
+ return file;
+ }
+
+ drm_dev_get(dev);
+ priv->filp = file;
+
+ return file;
+}
+EXPORT_SYMBOL(anon_drm_getfile);
diff --git a/include/drm/drm_file.h b/include/drm/drm_file.h
index 67af60bb527a..b963535964f7 100644
--- a/include/drm/drm_file.h
+++ b/include/drm/drm_file.h
@@ -42,6 +42,7 @@ struct dma_fence;
struct drm_file;
struct drm_device;
struct device;
+struct file;
/*
* FIXME: Not sure we want to have drm_minor here in the end, but to avoid
@@ -387,4 +388,6 @@ void drm_event_cancel_free(struct drm_device *dev,
void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e);
void drm_send_event(struct drm_device *dev, struct drm_pending_event *e);
+struct file *anon_drm_getfile(struct drm_minor *minor, unsigned int flags);
+
#endif /* _DRM_FILE_H_ */
--
2.24.0
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