Re: [PATCH v9 3/7] firmware: arm_rmm: Move RSI support out of arch/arm64
From: Jason Gunthorpe
Date: Fri Aug 28 2026 - 15:37:45 EST
> The RSI SMCCC function IDs describe a firmware ABI and are not arm64
> architecture specific definitions. Follow-up changes need to use them from
> non-arch code, including drivers/firmware/smccc and the Arm CCA guest
> driver.
>
> Move the complete Realm Service Interface (RSI) implementation from
> arch/arm64 to drivers/firmware/arm_rmm. The RSI SMCCC definitions and
> command helpers are also moved to include/linux so they can be shared by
> architecture code and firmware or driver code. This also keeps the
> firmware interface outside architecture code, as requested [1].
>
> [1] https://lore.kernel.org/all/agsNO9cc7H-b0H8L@willie-the-truck
>
> Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@xxxxxxxxxx>
The sashiko remarks don't look useful
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
> [ ... 321 lines skipped ... ]
> -#include <asm/rsi_smc.h>
> +#define RSI_PDEV_NAME "arm-cca-dev"
This name shows up on the smccc bus as a device, '-dev' doesn't seem
to make sense as a device name to me, I'd drop it.
And is this arm-cca or should it be called arm-rsi with a different SMCC device for
arm-rmi ?
--
Jason