[PATCH v4 0/6] Introduce NVIDIA Tegra Partition Table

Dmitry Osipenko
2020-05-15T01:42:50Z

Hello,

This series adds support for the NVIDIA Tegra Partition Table format,
which is needed in order to support consumer-grade Tegra-based devices
by the upstream kernel. These devices have Secure Boot enabled and it
can't be disabled, and thus, it's not possible to easily modify bootloader
and eMMC storage partitioning.

Big thanks to everyone who helped with figuring out the TegraPT format
and with testing!

Changelog:

v4: - Scanning of the eMMC boot partitions has been dropped because it
requires a bit too messy hacks in the kernel. We can live without
this feature, at least for now it's not really needed.

- Instead of the dropped boot partitions scanning, the "gpt_sector="
command line option has been brought back [1]. But now it's done
in a different way, not bothering platforms other than Tegra and
not touching block devices other than eMMC, which was requested during
of the [1] review. The "gpt_sector=" usage is needed when partition
table is inaccessible by kernel, which is the case for the Ouya game
console device for example. Please note that "gpt_sector=" is not
available on all devices, such devices will fall back to the TegraPT,
Samsung Galaxy Tab 10.1 is an example of a such device.

[1] https://patchwork.ozlabs.org/project/linux-tegra/patch/20200219162339.16192-1-digetx@gmail.com/

- We got a bit more broad testing and discovered that Samsung Galaxy
Tab 10.1 uses 2K logical sectors instead of 4K. So the 2K sectors
are supported now by the TegraPT parser. Thanks to Nils Östlund for
the testing!

- TegraPT parser now utilizes "tegraboot=" cmdline option which is
passed to kernel by the NVIDIA's bootloader. It's used for verifying
that SDMMC device is *the* boot source.

- Added patch that exposes Boot Configuration Table to userspace via
sysfs. Thanks to Michał Mirosław for the suggestion!

- Misc changes:
- The EB2 (second bootloader) partition is added to the list of
known partitions. Used by the Galaxy Tab 10.

- The blkdev logical sector size is checked now, for consistency.
It always should be 512 bytes on the supported/tested devices.

- Verbose error messages are replaced with pr_debug().

v3: - Fixed "BUG: KASAN: slab-out-of-bounds in tegra_partition". Thanks to
Peter Geis for noticing the problem.

- The MMC boot partitions scanning is now opt-in. See this patch:

mmc: block: Support partition-table scanning on boot partitions

- The found MMC boot partitions won't be assigned to the MMC boot
block device ever due to the new GENHD_FL_PART_SCAN_ONCE flag.

This makes us to ensure that the old behavior of the MMC core is
preserved for a non-Tegra MMC-block users.

New patches in v3:

block: Introduce GENHD_FL_PART_SCAN_ONCE
mmc: sdhci-tegra: Enable boot partitions scanning on Tegra20 and Tegra30

v2: - Addressed v1 review comments from Stephen Warren by using BIT for
locating BCT position in IRAM.

- Added more validations to the TegraPT parser: partition type is
verified, eMMC instance ID is verified.

- TegraPT parser now doesn't touch any devices other than eMMC.

- EKS (encrypted keys) partition is blacklisted now.

- Implemented eMMC boot partitions scanning. These new patches are
added in a result:

mmc: block: Add mmc_bdev_to_part_type() helper
mmc: block: Add mmc_bdev_to_area_type() helper
mmc: block: Add MMC_QUIRK_RESCAN_MAIN_BLKDEV
mmc: block: Enable partition-table scanning for boot partitions
partitions/tegra: Implement eMMC boot partitions scanning

Dmitry Osipenko (6):
mmc: core: Add raw_boot_mult field to mmc_ext_csd
mmc: block: Add mmc_bdev_to_card() helper
partitions: Introduce NVIDIA Tegra Partition Table
partitions/efi: Support GPT entry lookup at a non-standard location
partitions/tegra: Support gpt_sector= command line option
soc/tegra: Expose Boot Configuration Table via sysfs

arch/arm/mach-tegra/tegra.c | 58 ++++
block/partitions/Kconfig | 8 +
block/partitions/Makefile | 1 +
block/partitions/check.h | 2 +
block/partitions/core.c | 4 +
block/partitions/efi.c | 16 +
block/partitions/efi.h | 2 +
block/partitions/tegra.c | 603 ++++++++++++++++++++++++++++++++++
drivers/mmc/core/block.c | 15 +
drivers/mmc/core/mmc.c | 2 +
drivers/soc/tegra/Makefile | 1 +
drivers/soc/tegra/bootdata.c | 51 +++
drivers/soc/tegra/common.c | 17 +
include/linux/mmc/blkdev.h | 13 +
include/linux/mmc/card.h | 1 +
include/soc/tegra/bootdata.h | 48 +++
include/soc/tegra/common.h | 12 +
include/soc/tegra/partition.h | 83 +++++
18 files changed, 937 insertions(+)
create mode 100644 block/partitions/tegra.c
create mode 100644 drivers/soc/tegra/bootdata.c
create mode 100644 include/linux/mmc/blkdev.h
create mode 100644 include/soc/tegra/bootdata.h
create mode 100644 include/soc/tegra/partition.h

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2.26.0