linux-kernel - Re: [PATCH v3 03/10] partitions: Introduce NVIDIA Tegra Partition Table

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Message-ID: <ff2b5121-0ff7-1494-9184-31ec7f6d2e1a@gmail.com>
Date:   Wed, 25 Mar 2020 03:27:13 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        David Heidelberg <david@...t.cz>,
        Peter Geis <pgwipeout@...il.com>,
        Stephen Warren <swarren@...dotorg.org>,
        Nicolas Chauvet <kwizart@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Billy Laws <blaws05@...il.com>, linux-tegra@...r.kernel.org,
        linux-block@...r.kernel.org, Andrey Danin <danindrey@...l.ru>,
        Gilles Grandou <gilles@...ndou.net>,
        Ryan Grachek <ryan@...ted.us>, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 03/10] partitions: Introduce NVIDIA Tegra Partition
 Table

24.03.2020 23:52, Michał Mirosław пишет:
> On Tue, Mar 24, 2020 at 02:22:34AM +0300, Dmitry Osipenko wrote:
>> 24.03.2020 00:35, Michał Mirosław пишет:
>>> On Mon, Mar 23, 2020 at 10:59:52PM +0300, Dmitry Osipenko wrote:
>>>> 23.03.2020 22:17, Michał Mirosław пишет:
>>>>> On Mon, Mar 23, 2020 at 07:34:24PM +0300, Dmitry Osipenko wrote:
>>>>>> All NVIDIA Tegra devices use a special partition table format for the
>>>>>> internal storage partitioning. Most of Tegra devices have GPT partition
>>>>>> in addition to TegraPT, but some older Android consumer-grade devices do
>>>>>> not or GPT is placed in a wrong sector, and thus, the TegraPT is needed
>>>>>> in order to support these devices properly in the upstream kernel. This
>>>>>> patch adds support for NVIDIA Tegra Partition Table format that is used
>>>>>> at least by all NVIDIA Tegra20 and Tegra30 devices.
>>>>>>
>>>>>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
>>>>>> ---
>>>>>>  arch/arm/mach-tegra/tegra.c   |  54 ++++
>>>>> [...]
>>>>>
>>>>> Please split off this part and make the information available to
>>>>> userspace (pt_addr + pt_size) if found. This would make it easier
>>>>> to support use the partition table later in initrd instead.
>>>>
>>>> Please clarify what do you mean by "use the partition table later in
>>>> initrd instead".
>>>
>>> Configure device-mapper to span eMMC boot+data partitions and then ask
>>> (modified) kpartx to partition the resulting device. All before rootfs
>>> is mounted and switched to in initrd.
>>
>> The whole point of this series is to make partition handling generic in
>> the kernel, avoiding the need to customize anything.
> 
> Yes, but at least for diagnostic purposes, it would be nice to have the
> values from BCT exposed somewhere in /sys.

It could be useful indeed, but for now I'm not sure that it should be a
part of this patchset. I'll keep it mind, thank you for the suggestion.