** Changed in: linux-bluefield (Ubuntu Jammy)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1995296
Title:
mlx-bootctl: support icm carveout eeprom region read/write
Status in linux-bluefield package in Ubuntu:
Invalid
Status in linux-bluefield source package in Jammy:
Fix Committed
Bug description:
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
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