linux-kernel - Re: [PATCH] drm/i915: convert to new logging macros based on struct intel_engine

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Date:   Mon, 13 Jan 2020 16:17:11 +0300 (EAT)
From:   Wambui Karuga <wambui.karugax@...il.com>
To:     Jani Nikula <jani.nikula@...ux.intel.com>
cc:     Chris Wilson <chris@...is-wilson.co.uk>,
        Wambui Karuga <wambui.karugax@...il.com>, airlied@...ux.ie,
        daniel@...ll.ch, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, sean@...rly.run,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/i915: convert to new logging macros based on struct
 intel_engine_cs.



On Mon, 13 Jan 2020, Jani Nikula wrote:

> On Mon, 13 Jan 2020, Chris Wilson <chris@...is-wilson.co.uk> wrote:
>> Quoting Wambui Karuga (2020-01-13 11:10:25)
>>> fn(...) {
>>> ...
>>> struct intel_engine_cs *E = ...;
>>> +struct drm_i915_private *dev_priv = E->i915;
>>
>> No new dev_priv.
>
> Wambui, we're gradually converting all dev_priv variable and parameter
> names to i915.
>
Okay, I can change to that - dev_priv seemed more used in the files I 
changed.

Thanks,
wambui
>> There should be no reason for drm_dbg here, as the rest of the debug is
>> behind ENGINE_TRACE and so the vestigial debug should be moved over, or
>> deleted as not being useful.
>>
>> The error messages look unhelpful.
>
> I don't think you can expect any meaninful improvements on the debug
> message contents from Wambui without detailed help at this point.
>
>>
>>>                 if ((batch_end - cmd) < length) {
>>> -                       DRM_DEBUG("CMD: Command length exceeds batch length: 0x%08X length=%u batchlen=%td\n",
>>> -                                 *cmd,
>>> -                                 length,
>>> -                                 batch_end - cmd);
>>> +                       drm_dbg(&dev_priv->drm,
>>> +                               "CMD: Command length exceeds batch length: 0x%08X length=%u batchlen=%td\n",
>>
>> No. This is not driver debug. If anything this should be pr_debug, or
>> some over user centric channel.
>
> I'm sorry, I still don't understand your reasoning here.
>
> BR,
> Jani.
>
> -- 
> Jani Nikula, Intel Open Source Graphics Center
>