Re: [PATCH 9/9] drm/qxl: use new debugfs device-centered functions

[Daniel Vetter]

On Mon, Dec 26, 2022 at 12:50:29PM -0300, Maíra Canal wrote:
> Replace the use of drm_debugfs_create_files() with the new
> drm_debugfs_add_files() function, which center the debugfs files
> management on the drm_device instead of drm_minor. Moreover, remove the
> debugfs_init hook and add the debugfs files directly on qxl_pci_probe(),
> before drm_dev_register().
> 
> Signed-off-by: Maíra Canal <mcanal@xxxxxxxxxx>
> ---
>  drivers/gpu/drm/qxl/qxl_debugfs.c | 18 ++++++++----------
>  drivers/gpu/drm/qxl/qxl_drv.c     |  5 ++---
>  drivers/gpu/drm/qxl/qxl_drv.h     |  2 +-
>  3 files changed, 11 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpu/drm/qxl/qxl_debugfs.c b/drivers/gpu/drm/qxl/qxl_debugfs.c
> index bdfce1a8f006..fd18a7b193b3 100644
> --- a/drivers/gpu/drm/qxl/qxl_debugfs.c
> +++ b/drivers/gpu/drm/qxl/qxl_debugfs.c
> @@ -38,8 +38,8 @@
>  static int
>  qxl_debugfs_irq_received(struct seq_file *m, void *data)
>  {
> -	struct drm_info_node *node = (struct drm_info_node *) m->private;
> -	struct qxl_device *qdev = to_qxl(node->minor->dev);
> +	struct drm_debugfs_entry *entry = m->private;
> +	struct qxl_device *qdev = to_qxl(entry->dev);
>  
>  	seq_printf(m, "%d\n", atomic_read(&qdev->irq_received));
>  	seq_printf(m, "%d\n", atomic_read(&qdev->irq_received_display));
> @@ -52,8 +52,8 @@ qxl_debugfs_irq_received(struct seq_file *m, void *data)
>  static int
>  qxl_debugfs_buffers_info(struct seq_file *m, void *data)
>  {
> -	struct drm_info_node *node = (struct drm_info_node *) m->private;
> -	struct qxl_device *qdev = to_qxl(node->minor->dev);
> +	struct drm_debugfs_entry *entry = m->private;
> +	struct qxl_device *qdev = to_qxl(entry->dev);
>  	struct qxl_bo *bo;
>  
>  	list_for_each_entry(bo, &qdev->gem.objects, list) {
> @@ -76,21 +76,19 @@ qxl_debugfs_buffers_info(struct seq_file *m, void *data)
>  	return 0;
>  }
>  
> -static struct drm_info_list qxl_debugfs_list[] = {
> +static struct drm_debugfs_info qxl_debugfs_list[] = {
>  	{ "irq_received", qxl_debugfs_irq_received, 0, NULL },
>  	{ "qxl_buffers", qxl_debugfs_buffers_info, 0, NULL },
>  };
>  #define QXL_DEBUGFS_ENTRIES ARRAY_SIZE(qxl_debugfs_list)
>  #endif
>  
> -void
> -qxl_debugfs_init(struct drm_minor *minor)
> +void qxl_debugfs_init(struct drm_device *drm)
>  {
>  #if defined(CONFIG_DEBUG_FS)

Again since it's all in the same file I'd drop the #ifdef and use
__maybe_unused. Either way

Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>

You could do the same trick for omap drm too I guess, but since it's a bit
across files it's a bit more annoying (and you'd have one cross-file
function call left but *meh*). For the other patches without review yet:

Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>

I'd wait another week (because holiday break) for any maintainer feedback
and then push.
-Daniel

> -	struct qxl_device *dev = to_qxl(minor->dev);
> +	struct qxl_device *dev = to_qxl(drm);
>  
> -	drm_debugfs_create_files(qxl_debugfs_list, QXL_DEBUGFS_ENTRIES,
> -				 minor->debugfs_root, minor);
> +	drm_debugfs_add_files(drm, qxl_debugfs_list, QXL_DEBUGFS_ENTRIES);
>  
>  	qxl_ttm_debugfs_init(dev);
>  #endif
> diff --git a/drivers/gpu/drm/qxl/qxl_drv.c b/drivers/gpu/drm/qxl/qxl_drv.c
> index a3b83f89e061..3ae2db78f671 100644
> --- a/drivers/gpu/drm/qxl/qxl_drv.c
> +++ b/drivers/gpu/drm/qxl/qxl_drv.c
> @@ -116,6 +116,8 @@ qxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  	if (ret)
>  		goto unload;
>  
> +	qxl_debugfs_init(&qdev->ddev);
> +
>  	drm_kms_helper_poll_init(&qdev->ddev);
>  
>  	/* Complete initialization. */
> @@ -287,9 +289,6 @@ static struct drm_driver qxl_driver = {
>  
>  	.dumb_create = qxl_mode_dumb_create,
>  	.dumb_map_offset = drm_gem_ttm_dumb_map_offset,
> -#if defined(CONFIG_DEBUG_FS)
> -	.debugfs_init = qxl_debugfs_init,
> -#endif
>  	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
>  	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
>  	.gem_prime_import_sg_table = qxl_gem_prime_import_sg_table,
> diff --git a/drivers/gpu/drm/qxl/qxl_drv.h b/drivers/gpu/drm/qxl/qxl_drv.h
> index 0868d5d2a839..cb84a3bebcec 100644
> --- a/drivers/gpu/drm/qxl/qxl_drv.h
> +++ b/drivers/gpu/drm/qxl/qxl_drv.h
> @@ -397,7 +397,7 @@ int qxl_garbage_collect(struct qxl_device *qdev);
>  
>  /* debugfs */
>  
> -void qxl_debugfs_init(struct drm_minor *minor);
> +void qxl_debugfs_init(struct drm_device *drm);
>  void qxl_ttm_debugfs_init(struct qxl_device *qdev);
>  
>  /* qxl_prime.c */
> -- 
> 2.38.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch