pds_core: add host backed memory support for firmware

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Some newer AMD/Pensando cards have minimal memory and there are cases
where components, specifically in the control plane, need more memory.
This series adds support for host backed DMA memory that can be used
by the firmware for the previously mentioned cases.

Host memory allocation is best-effort: if some allocations fail, the
driver continues with whatever succeeded. Firmware gracefully degrades
when less memory is available than requested.

Signed-off-by: Vamsi Atluri <Vamsi.Atluri@amd.com>
Signed-off-by: Nikhil P. Rao <nikhil.rao@amd.com>
Link: https://patch.msgid.link/20260730-upstream_v8-v12-5-136cd174ee85@amd.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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This commit is contained in:

Nikhil P. Rao 2026-07-30 04:25:22 +00:00 • committed by Jakub Kicinski

parent 5df545b3a5

commit b311af86b5

4 changed files with 248 additions and 0 deletions

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160

drivers/net/ethernet/amd/pds_core/core.c

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22

drivers/net/ethernet/amd/pds_core/core.h

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2

drivers/net/ethernet/amd/pds_core/main.c

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64

include/linux/pds/pds_core_if.h

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