linux-kernel - Re: [PATCH v2 3/8] partitions: Introduce NVIDIA Tegra Partition Table

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Date:   Thu, 5 Mar 2020 18:22:53 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Dmitry Osipenko <digetx@...il.com>, Jens Axboe <axboe@...nel.dk>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        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>
Cc:     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 v2 3/8] partitions: Introduce NVIDIA Tegra Partition Table

On 3/5/20 6:12 PM, 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 ++++
>  block/partitions/Kconfig      |   9 +
>  block/partitions/Makefile     |   1 +
>  block/partitions/check.c      |   4 +
>  block/partitions/tegra.c      | 510 ++++++++++++++++++++++++++++++++++
>  block/partitions/tegra.h      |  83 ++++++
>  include/soc/tegra/bootdata.h  |  46 +++
>  include/soc/tegra/common.h    |   9 +
>  include/soc/tegra/partition.h |  18 ++
>  9 files changed, 734 insertions(+)
>  create mode 100644 block/partitions/tegra.c
>  create mode 100644 block/partitions/tegra.h
>  create mode 100644 include/soc/tegra/bootdata.h
>  create mode 100644 include/soc/tegra/partition.h

Hi Dmitry,


> diff --git a/block/partitions/Kconfig b/block/partitions/Kconfig
> index 702689a628f0..d3c5c6ad6d58 100644
> --- a/block/partitions/Kconfig
> +++ b/block/partitions/Kconfig
> @@ -268,3 +268,12 @@ config CMDLINE_PARTITION
>  	help
>  	  Say Y here if you want to read the partition table from bootargs.
>  	  The format for the command line is just like mtdparts.
> +
> +config TEGRA_PARTITION
> +	bool "NVIDIA Tegra Partition support" if PARTITION_ADVANCED
> +	default y if ARCH_TEGRA
> +	depends on ARCH_TEGRA || COMPILE_TEST
> +	select MMC_BLOCK

You shouldn't select MMC_BLOCK unless MMC is already enabled,
so this entire config should depend on MMC also.
As is, without MMC set/enabled, it should give you a kconfig warning.

(no, you should not also select MMC here.)

(This is just based on reading the patch--I haven't tested it
with CONFIG_MMC not set/enabled.  Have you?)


> +	help
> +	  Say Y here if you would like to be able to read the hard disk
> +	  partition table format used by NVIDIA Tegra machines.

Thanks.
-- 
~Randy