linux-kernel - Re: [PATCH v2 2/3] driver core: fw_devlink: Improve detection of overlapping cycles

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Date: Mon, 19 Feb 2024 22:55:36 -0800
From: Saravana Kannan <saravanak@...gle.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	Xu Yang <xu.yang_2@....com>, kernel-team@...roid.com, linux-kernel@...r.kernel.org, 
	Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] driver core: fw_devlink: Improve detection of
 overlapping cycles

On Mon, Feb 19, 2024 at 2:59 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Saravana,
>
> On Fri, Feb 2, 2024 at 10:57 AM Saravana Kannan <saravanak@...glecom> wrote:
> > fw_devlink can detect most overlapping/intersecting cycles. However it was
> > missing a few corner cases because of an incorrect optimization logic that
> > tries to avoid repeating cycle detection for devices that are already
> > marked as part of a cycle.
>
> Nice (I assume it's due to this patch ;-), with v6.8-rc5 I see much fewer
> dependency cycle messages.

Thanks!

It's not due to this patch. It's due to this other series:
https://lore.kernel.org/lkml/20240207011803.2637531-1-saravanak@google.com/

I forget why the cycle warning doesn't show up between fea80000.csi2
and video@...f7000, but I had the same improvement on my test device
and there was a valid reason why it doesn't show up. So, an
unintentional, but non-buggy benefit of that series.

-Saravana

>
> E.g. on Salvator-XS:
>
> -platform fea80000.csi2: Fixed dependency cycle(s) with
> /soc/video@...f7000/ports/port@...ndpoint@0
> -platform fea80000.csi2: Fixed dependency cycle(s) with
> /soc/video@...f6000/ports/port@...ndpoint@0
> -platform fea80000.csi2: Fixed dependency cycle(s) with
> /soc/video@...f5000/ports/port@...ndpoint@0
> -platform fea80000.csi2: Fixed dependency cycle(s) with
> /soc/video@...f4000/ports/port@...ndpoint@0
> -platform fea80000.csi2: Fixed dependency cycle(s) with
> /soc/video@...f3000/ports/port@...ndpoint@0
> -platform fea80000.csi2: Fixed dependency cycle(s) with
> /soc/video@...f2000/ports/port@...ndpoint@0
> -platform fea80000.csi2: Fixed dependency cycle(s) with
> /soc/video@...f1000/ports/port@...ndpoint@0
> -platform fea80000.csi2: Fixed dependency cycle(s) with
> /soc/video@...f0000/ports/port@...ndpoint@0
> -platform feaa0000.csi2: Fixed dependency cycle(s) with
> /soc/video@...f3000/ports/port@...ndpoint@2
> -platform feaa0000.csi2: Fixed dependency cycle(s) with
> /soc/video@...f2000/ports/port@...ndpoint@2
> -platform feaa0000.csi2: Fixed dependency cycle(s) with
> /soc/video@...f1000/ports/port@...ndpoint@2
> -platform feaa0000.csi2: Fixed dependency cycle(s) with
> /soc/video@...f0000/ports/port@...ndpoint@2
> -platform fead0000.hdmi: Fixed dependency cycle(s) with
> /soc/sound@...00000/ports/port@...ndpoint
> -platform feae0000.hdmi: Fixed dependency cycle(s) with
> /soc/sound@...00000/ports/port@...ndpoint
> -platform feb00000.display: Fixed dependency cycle(s) with
> /soc/hdmi@...e0000/ports/port@...ndpoint
> -platform feb00000.display: Fixed dependency cycle(s) with
> /soc/hdmi@...d0000/ports/port@...ndpoint
> -platform hdmi0-out: Fixed dependency cycle(s) with
> /soc/hdmi@...d0000/ports/port@...ndpoint
> -platform hdmi1-out: Fixed dependency cycle(s) with
> /soc/hdmi@...e0000/ports/port@...ndpoint
> -platform vga-encoder: Fixed dependency cycle(s) with /vga/port/endpoint
> -platform vga-encoder: Fixed dependency cycle(s) with
> /soc/display@...00000/ports/port@...ndpoint
>
> -i2c 2-0010: Fixed dependency cycle(s) with
> /soc/sound@...00000/ports/port@...ndpoint
> -i2c 2-0010: Fixed dependency cycle(s) with /soc/sound@...00000
>
> -i2c 4-0070: Fixed dependency cycle(s) with
> /soc/csi2@...80000/ports/port@...ndpoint
> -i2c 4-0070: Fixed dependency cycle(s) with
> /soc/csi2@...a0000/ports/port@...ndpoint
> -i2c 4-0070: Fixed dependency cycle(s) with /hdmi-in/port/endpoint
> -i2c 4-0070: Fixed dependency cycle(s) with /cvbs-in/port/endpoint
>
> FTR, the only remaining ones (on Salvator-XS) are:
>
>     platform soc: Fixed dependency cycle(s) with
> /soc/interrupt-controller@...10000
>     platform e6060000.pinctrl: Fixed dependency cycle(s) with
> /soc/pinctrl@...60000/scif_clk
>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds