linux-kernel - Re: [PATCH 06/24] thunderbolt: Introduce thunderbolt bus and connection manager

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Date:   Thu, 25 May 2017 17:42:28 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <yehezkel.bernat@...el.com>,
        Lukas Wunner <lukas@...ner.de>,
        Amir Levy <amir.jer.levy@...el.com>,
        Andy Lutomirski <luto@...nel.org>, Mario.Limonciello@...l.com,
        Jared.Dominguez@...l.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/24] thunderbolt: Introduce thunderbolt bus and
 connection manager

On Thu, May 25, 2017 at 03:23:39PM +0200, Greg Kroah-Hartman wrote:
> On Thu, May 18, 2017 at 05:38:56PM +0300, Mika Westerberg wrote:
> > Thunderbolt fabric consists of one or more switches. This fabric is
> > called domain and it is controlled by an entity called connection
> > manager. The connection manager can be either internal (driven by a
> > firmware running on the host controller) or external (software driver).
> > This driver currently implements support for the latter.
> > 
> > In order to manage switches and their properties more easily we model
> > this domain structure as a Linux bus. Each host controller adds a domain
> > device to this bus, and these devices are named as domainN where N
> > stands for index or id of the current domain.
> > 
> > We then abstract connection manager specific operations into a new
> > structure tb_cm_ops and convert the existing tb.c to fill those
> > accordingly. This makes it easier to add support for the internal
> > connection manager in subsequent patches.
> > 
> > Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> > Reviewed-by: Yehezkel Bernat <yehezkel.bernat@...el.com>
> > Reviewed-by: Michael Jamet <michael.jamet@...el.com>
> > ---
> >  drivers/thunderbolt/Makefile     |   2 +-
> >  drivers/thunderbolt/domain.c     | 230 +++++++++++++++++++++++++++++++++++++++
> >  drivers/thunderbolt/nhi.c        |  31 ++++--
> >  drivers/thunderbolt/tb.c         | 156 ++++++++++++--------------
> >  drivers/thunderbolt/tb.h         |  70 +++++++++---
> >  drivers/thunderbolt/tunnel_pci.c |   9 +-
> >  6 files changed, 377 insertions(+), 121 deletions(-)
> >  create mode 100644 drivers/thunderbolt/domain.c
> > 
> > diff --git a/drivers/thunderbolt/Makefile b/drivers/thunderbolt/Makefile
> > index 5d1053cdfa54..e276a9a62261 100644
> > --- a/drivers/thunderbolt/Makefile
> > +++ b/drivers/thunderbolt/Makefile
> > @@ -1,3 +1,3 @@
> >  obj-${CONFIG_THUNDERBOLT} := thunderbolt.o
> >  thunderbolt-objs := nhi.o ctl.o tb.o switch.o cap.o path.o tunnel_pci.o eeprom.o
> > -
> > +thunderbolt-objs += domain.o
> > diff --git a/drivers/thunderbolt/domain.c b/drivers/thunderbolt/domain.c
> > new file mode 100644
> > index 000000000000..b5bfca95415d
> > --- /dev/null
> > +++ b/drivers/thunderbolt/domain.c
> > @@ -0,0 +1,230 @@
> > +/*
> > + * Thunderbolt bus support
> > + *
> > + * Copyright (C) 2017, Intel Corporation
> > + * Author:  Mika Westerberg <mika.westerberg@...ux.intel.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + */
> > +
> > +#include <linux/device.h>
> > +#include <linux/idr.h>
> > +#include <linux/module.h>
> > +#include <linux/slab.h>
> > +
> > +#include "tb.h"
> > +
> > +static DEFINE_IDA(tb_domain_ida);
> 
> You forgot to clean this up in your module exit code with a call to
> ida_destroy(&tb_domain_ida);

Ah, I see. OK, I'll add that missing call to tb_domain_exit().

> Yeah, it's not obvious, I've made the same mistake before :)
> 
> Other than that minor thing, the bus logic looks good, nice job.

Thanks :-)