linux-kernel - Re: [PATCH 0/2] drm/i915/gem: conversion to new drm logging macros

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Date:   Mon, 27 Jan 2020 10:05:57 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Chris Wilson <chris@...is-wilson.co.uk>
Cc:     Wambui Karuga <wambui.karugax@...il.com>, airlied@...ux.ie,
        daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, jani.nikula@...ux.intel.com,
        joonas.lahtinen@...ux.intel.com, linux-kernel@...r.kernel.org,
        rodrigo.vivi@...el.com
Subject: Re: [PATCH 0/2] drm/i915/gem: conversion to new drm logging macros

On Sat, Jan 25, 2020 at 04:08:39PM +0000, Chris Wilson wrote:
> Quoting Wambui Karuga (2020-01-22 12:57:48)
> > This series is a part of the conversion to  the new struct drm_device
> > based logging macros in drm/i915.
> > This series focuses on the drm/i915/gem directory and converts all
> > straightforward instances of the printk based logging macros to the new
> > macros.
> 
> Overall, I'm not keen on this as it perpetuates the mistake of putting
> client debug message in dmesg and now gives them even more an air of
> being device driver debug messages. We need a mechanism by which we
> report the details of what a client did wrong back to that client
> (tracefs + context/client getparam to return an isolated debug fd is my
> idea).

Sean is working on that, but it's a global thing still. Well since it's
tracefs should be easy to filter for a given process at least. We've had
long discussion about how to expose that, big fear (especially with
atomic) is that clients/compositors will start to look at random debug
strings and make them uapi.

But I think for stuff like igt we should be able to wire it up easily and
get it dumped when things go wrong. Maybe similar when mesa gets an
unexpected errno.
-Daniel

> > Wambui Karuga (2):
> >   drm/i915/gem: initial conversion to new logging macros using
> >     coccinelle.
> >   drm/i915/gem: manual conversion to struct drm_device logging macros.
> 
> Still this is a necessary evil for the current situation,
> Acked-by: Chris Wilson <chris@...is-wilson.co.uk>
> -Chris

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