linux-kernel - Re: [PATCH v6 39/57] dyndbg/drm: POC add tracebits sysfs-knob

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Message-ID: <YxhBZLAasKaBPEDT@phenom.ffwll.local>
Date:   Wed, 7 Sep 2022 08:59:48 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Jim Cromie <jim.cromie@...il.com>
Cc:     jbaron@...mai.com, gregkh@...uxfoundation.org,
        dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        daniel.vetter@...ll.ch, seanpaul@...omium.org, robdclark@...il.com,
        linux@...musvillemoes.dk, joe@...ches.com
Subject: Re: [PATCH v6 39/57] dyndbg/drm: POC add tracebits sysfs-knob

On Sun, Sep 04, 2022 at 03:41:16PM -0600, Jim Cromie wrote:
> clone DRM.debug interface to DRM.tracebits: ie map bits to
> drm-debug-categories, except this interface enables messages to
> tracefs, not to syslog.
> 
> 1- we reuse the class-map added previously.
>    this reflects the single source of both syslog/trace events
> 
> 2- add a 2nd struct ddebug_classes_bitmap_param
>    refs 1, reusing it.
>    flags = "T", to enable trace-events on this callsite.
> 
> 3- module_param_cb([2]) - does the sysfs part
> 
> Signed-off-by: Jim Cromie <jim.cromie@...il.com>

All the drm patches (excluding nouveau) I haven't commented on:

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

I think nouveau I'll leave up to nouveau folks.
-Daniel



> ---
>  drivers/gpu/drm/drm_print.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
> index c50edbf443d3..75d0cecd7e86 100644
> --- a/drivers/gpu/drm/drm_print.c
> +++ b/drivers/gpu/drm/drm_print.c
> @@ -45,6 +45,9 @@
>  unsigned long __drm_debug;
>  EXPORT_SYMBOL(__drm_debug);
>  
> +unsigned long __drm_trace;
> +EXPORT_SYMBOL(__drm_trace);
> +
>  MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug category.\n"
>  "\t\tBit 0 (0x01)  will enable CORE messages (drm core code)\n"
>  "\t\tBit 1 (0x02)  will enable DRIVER messages (drm controller code)\n"
> @@ -77,6 +80,13 @@ static struct ddebug_class_param drm_debug_bitmap = {
>  	.map = &drm_debug_classes,
>  };
>  module_param_cb(debug, &param_ops_dyndbg_classes, &drm_debug_bitmap, 0600);
> +
> +static struct ddebug_class_param drm_trace_bitmap = {
> +	.bits = &__drm_trace,
> +	.flags = "T",
> +	.map = &drm_debug_classes,
> +};
> +module_param_cb(tracecats, &param_ops_dyndbg_classes, &drm_trace_bitmap, 0600);
>  #endif
>  
>  void __drm_puts_coredump(struct drm_printer *p, const char *str)
> -- 
> 2.37.2
> 

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