On Wed, Nov 06, 2019 at 02:24:29PM +0000, Chris Wilson wrote: > 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. > > v2: Restrict usage to selftests > > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > Cc: Daniel Vetter <daniel.vetter@xxxxxxxx> Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx> > --- > drivers/gpu/drm/drm_file.c | 42 ++++++++++++++++++++++++++++++++++++++ > include/drm/drm_file.h | 3 +++ > 2 files changed, 45 insertions(+) > > diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c > index ea34bc991858..4d9385d1bf2d 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 +756,43 @@ 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); > + > +/** > + * mock_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 *mock_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; > + } > + > + /* Everyone shares a single global address space */ > + file->f_mapping = dev->anon_inode->i_mapping; > + > + drm_dev_get(dev); > + priv->filp = file; > + > + return file; > +} > +EXPORT_SYMBOL_FOR_TESTS_ONLY(mock_drm_getfile); > diff --git a/include/drm/drm_file.h b/include/drm/drm_file.h > index 67af60bb527a..8b099b347817 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 *mock_drm_getfile(struct drm_minor *minor, unsigned int flags); > + > #endif /* _DRM_FILE_H_ */ > -- > 2.24.0 > -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel