linux-kernel - Re: [PATCH v2 36/59] drm-dyndbg: adapt drm core to use dyndbg classmaps-v2

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Message-ID: <82885419-a39a-4268-aa9a-7b0a8e04a46d@bootlin.com>
Date: Mon, 24 Mar 2025 16:23:48 +0100
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Jim Cromie <jim.cromie@...il.com>, linux-kernel@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
 intel-gvt-dev@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
 intel-gfx-trybot@...ts.freedesktop.org
Cc: jbaron@...mai.com, gregkh@...uxfoundation.org, ukaszb@...omium.org,
 daniel.vetter@...ll.ch, tvrtko.ursulin@...ux.intel.com,
 jani.nikula@...el.com, ville.syrjala@...ux.intel.com
Subject: Re: [PATCH v2 36/59] drm-dyndbg: adapt drm core to use dyndbg
 classmaps-v2



Le 20/03/2025 à 19:52, Jim Cromie a écrit :
> dyndbg's CLASSMAP-v1 api was broken; DECLARE_DYNDBG_CLASSMAP tried to
> do too much.  Its replaced by DRM_CLASSMAP_DEFINE, which creates &
> EXPORTs a classmap (in DRM core), and DRM_CLASSMAP_USE which refers to
> the classmap defined elsewhere.
> 
> The drivers still use DECLARE_DYNDBG_CLASSMAP for now, so they still
> redundantly re-declare the classmap, but we can convert the drivers
> later to DYNDBG_CLASSMAP_USE
> 
> Signed-off-by: Jim Cromie <jim.cromie@...il.com>

Reviewed-by: Louis Chauvet <louis.chauvet@...tlin.com>

> ---
> this ignores a checkpatch
>   WARNING: Argument 'name' is not used in function-like macro
>   #70: FILE: include/drm/drm_print.h:148:
>   +#define DRM_CLASSMAP_USE(name)
> 
> the macro is empty, and correct. only 1 arg is expected.

The patch to remove this warning is before, so I think this is not an 
issue anymore.

> ---
>   drivers/gpu/drm/drm_print.c | 25 +++++++++++++------------
>   include/drm/drm_print.h     |  8 ++++++++
>   2 files changed, 21 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
> index 79517bd4418f..a3b70d104afa 100644
> --- a/drivers/gpu/drm/drm_print.c
> +++ b/drivers/gpu/drm/drm_print.c
> @@ -55,18 +55,19 @@ MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug cat
>   #if !defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
>   module_param_named(debug, __drm_debug, ulong, 0600);
>   #else
> -/* classnames must match vals of enum drm_debug_category */
> -DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
> -			"DRM_UT_CORE",
> -			"DRM_UT_DRIVER",
> -			"DRM_UT_KMS",
> -			"DRM_UT_PRIME",
> -			"DRM_UT_ATOMIC",
> -			"DRM_UT_VBL",
> -			"DRM_UT_STATE",
> -			"DRM_UT_LEASE",
> -			"DRM_UT_DP",
> -			"DRM_UT_DRMRES");
> +/* classnames must match value-symbols of enum drm_debug_category */
> +DRM_CLASSMAP_DEFINE(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS,
> +		    DRM_UT_CORE,
> +		    "DRM_UT_CORE",
> +		    "DRM_UT_DRIVER",
> +		    "DRM_UT_KMS",
> +		    "DRM_UT_PRIME",
> +		    "DRM_UT_ATOMIC",
> +		    "DRM_UT_VBL",
> +		    "DRM_UT_STATE",
> +		    "DRM_UT_LEASE",
> +		    "DRM_UT_DP",
> +		    "DRM_UT_DRMRES");
>   
>   static struct ddebug_class_param drm_debug_bitmap = {
>   	.bits = &__drm_debug,
> diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
> index 9732f514566d..e86ebb716b4c 100644
> --- a/include/drm/drm_print.h
> +++ b/include/drm/drm_print.h
> @@ -141,6 +141,14 @@ enum drm_debug_category {
>   	DRM_UT_DRMRES
>   };
>   
> +#ifdef CONFIG_DRM_USE_DYNAMIC_DEBUG
> +#define DRM_CLASSMAP_DEFINE(...)    DYNAMIC_DEBUG_CLASSMAP_DEFINE(__VA_ARGS__)
> +#define DRM_CLASSMAP_USE(name)      DYNAMIC_DEBUG_CLASSMAP_USE(name)
> +#else
> +#define DRM_CLASSMAP_DEFINE(...)
> +#define DRM_CLASSMAP_USE(name)
> +#endif
> +
>   static inline bool drm_debug_enabled_raw(enum drm_debug_category category)
>   {
>   	return unlikely(__drm_debug & BIT(category));

-- 
Louis Chauvet, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com