firmware: arm_ffa: Add support for MEM_LEND

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As part of the FF-A spec, an endpoint is allowed to transfer access of,
or lend, a memory region to one or more borrowers.

Extend the existing memory sharing implementation to support
FF-A MEM_LEND functionality and expose this to other kernel drivers.

Note that upon a successful MEM_LEND request the caller must ensure that
the memory region specified is not accessed until a successful
MEM_RECALIM call has been made. On systems with a hypervisor present
this will been enforced, however on systems without a hypervisor the
responsibility falls to the calling kernel driver to prevent access.

Link: https://lore.kernel.org/r/20211015165742.2513065-1-marc.bonnici@arm.com
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Marc Bonnici <marc.bonnici@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

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Marc Bonnici 2021-10-15 17:57:42 +01:00 • committed by Sudeep Holla

parent 8e3f9da608

commit 82a8daaecf

2 changed files with 19 additions and 0 deletions

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17

drivers/firmware/arm_ffa/driver.c

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2

include/linux/arm_ffa.h

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