[SRU][J:linux-bluefield][PATCH v1 0/1] UBUNTU: SAUCE: mlx-bootctl: support icm carveout eeprom region read/write

[Asmaa Mnebhi]

BugLink: https://bugs.launchpad.net/bugs/1995296

SRU Justification:

[Impact]

The BlueField-3 ICM carveout feature will enable NIC FW to bypass the SMMU block
to access DRAM memory. The amount of memory accessible by FW will be controlled by ARM.
This patch enables setting the size of the large ICM carveout from
userspace. The max size is 1TB, has a granularity of 128MB and will be passed
and printed in hex. The size unit is MB.

[Fix]

* Support SMC calls to control the large ICM carveout size.

[Test Case]

* Only valid testing on BlueField-3 real hardware.
* set the region size from sysfs and NIC FW will test that it has access to the entire region requested.

[Regression Potential]

* This code doesn't really have a negative impact on the functionality of the mlxbf-bootctl
  driver itself but could be a risk for the overall boot if not used/tested properly.
* memory region requested is too large, adn linux cannot boot as a result. The memory
  allocated for the ICM carveout cannot be accessed by linux.
* the icmc size is not passed properly to NIC FW

Asmaa Mnebhi (1):
  UBUNTU: SAUCE: mlx-bootctl: support icm carveout eeprom region
    read/write

 drivers/platform/mellanox/mlxbf-bootctl.c | 40 +++++++++++++++++++++++
 drivers/platform/mellanox/mlxbf-bootctl.h |  9 +++++
 2 files changed, 49 insertions(+)

-- 
2.30.1