linux-kernel - Re: [PATCH] drm: core: Convert device logging to drm

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Date:   Sat, 18 Jul 2020 17:15:33 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Suraj Upadhyay <usuraj35@...il.com>
Cc:     maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...ux.ie, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: core: Convert device logging to drm_* functions.

Hi Suraj.

On Sat, Jul 18, 2020 at 08:25:31PM +0530, Suraj Upadhyay wrote:
> Convert device logging with dev_* functions into drm_* functions.
> 
> The patch has been generated with the coccinelle script below.
> The script focuses on instances of dev_* functions where the drm device
> context is clearly visible in its arguments.
> 
> @@expression E1; expression list E2; @@
> -dev_warn(E1->dev, E2)
> +drm_warn(E1, E2)
> 
> @@expression E1; expression list E2; @@
> -dev_info(E1->dev, E2)
> +drm_info(E1, E2)
> 
> @@expression E1; expression list E2; @@
> -dev_err(E1->dev, E2)
> +drm_err(E1, E2)
> 
> @@expression E1; expression list E2; @@
> -dev_info_once(E1->dev, E2)
> +drm_info_once(E1, E2)
> 
> @@expression E1; expression list E2; @@
> -dev_notice_once(E1->dev, E2)
> +drm_notice_once(E1, E2)
> 
> @@expression E1; expression list E2; @@
> -dev_warn_once(E1->dev, E2)
> +drm_warn_once(E1, E2)
> 
> @@expression E1; expression list E2; @@
> -dev_err_once(E1->dev, E2)
> +drm_err_once(E1, E2)
> 
> @@expression E1; expression list E2; @@
> -dev_err_ratelimited(E1->dev, E2)
> +drm_err_ratelimited(E1, E2)
> 
> @@expression E1; expression list E2; @@
> -dev_dbg(E1->dev, E2)
> +drm_dbg_(E1, E2)
> 
> Signed-off-by: Suraj Upadhyay <usuraj35@...il.com>
> ---
>  drivers/gpu/drm/drm_edid.c           | 6 ++----
>  drivers/gpu/drm/drm_gem_cma_helper.c | 4 ++--
>  drivers/gpu/drm/drm_mipi_dbi.c       | 7 +++----
>  3 files changed, 7 insertions(+), 10 deletions(-)

Looks good, coccinelle is a reliable way for such mass conversion.

When converting to new style logging then all logging should be
converted in a file. Maybe, if too much, split in two patches.
But for all three files there are logging remaining to be converted
so we would end up in several patch-sets before done.
Please try to extend the scripting to also cover DRM_ => drm_ logging.
You may need some manual adjustments to cover it all.

	Sam

> 
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 52b357e75c3d..6840f0530a38 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -1844,9 +1844,7 @@ static void connector_bad_edid(struct drm_connector *connector,
>  	if (connector->bad_edid_counter++ && !drm_debug_enabled(DRM_UT_KMS))
>  		return;
>  
> -	dev_warn(connector->dev->dev,
> -		 "%s: EDID is invalid:\n",
> -		 connector->name);
> +	drm_warn(connector->dev, "%s: EDID is invalid:\n", connector->name);
>  	for (i = 0; i < num_blocks; i++) {
>  		u8 *block = edid + i * EDID_LENGTH;
>  		char prefix[20];
> @@ -5298,7 +5296,7 @@ int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
>  	}
>  	if (!drm_edid_is_valid(edid)) {
>  		clear_eld(connector);
> -		dev_warn(connector->dev->dev, "%s: EDID invalid.\n",
> +		drm_warn(connector->dev, "%s: EDID invalid.\n",
>  			 connector->name);
>  		return 0;
>  	}
> diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c
> index 06a5b9ee1fe0..8d7408a78aee 100644
> --- a/drivers/gpu/drm/drm_gem_cma_helper.c
> +++ b/drivers/gpu/drm/drm_gem_cma_helper.c
> @@ -105,8 +105,8 @@ struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm,
>  	cma_obj->vaddr = dma_alloc_wc(drm->dev, size, &cma_obj->paddr,
>  				      GFP_KERNEL | __GFP_NOWARN);
>  	if (!cma_obj->vaddr) {
> -		dev_dbg(drm->dev, "failed to allocate buffer with size %zu\n",
> -			size);
> +		drm_dbg_(drm, "failed to allocate buffer with size %zu\n",
> +			 size);
>  		ret = -ENOMEM;
>  		goto error;
>  	}
> diff --git a/drivers/gpu/drm/drm_mipi_dbi.c b/drivers/gpu/drm/drm_mipi_dbi.c
> index 0e55d8716e3d..a7a611894243 100644
> --- a/drivers/gpu/drm/drm_mipi_dbi.c
> +++ b/drivers/gpu/drm/drm_mipi_dbi.c
> @@ -225,9 +225,8 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
>  		drm_fb_xrgb8888_to_rgb565(dst, src, fb, clip, swap);
>  		break;
>  	default:
> -		dev_err_once(fb->dev->dev, "Format is not supported: %s\n",
> -			     drm_get_format_name(fb->format->format,
> -						 &format_name));
> +		drm_err_once(fb->dev, "Format is not supported: %s\n",
> +			     drm_get_format_name(fb->format->format, &format_name));
>  		return -EINVAL;
>  	}
>  
> @@ -295,7 +294,7 @@ static void mipi_dbi_fb_dirty(struct drm_framebuffer *fb, struct drm_rect *rect)
>  				   width * height * 2);
>  err_msg:
>  	if (ret)
> -		dev_err_once(fb->dev->dev, "Failed to update display %d\n", ret);
> +		drm_err_once(fb->dev, "Failed to update display %d\n", ret);
>  
>  	drm_dev_exit(idx);
>  }
> -- 
> 2.17.1
>