[PATCH v3 02/10] arm-ffa: add FF-A bus runtime support

[Abdellatif El Khlifi]

On Sat, Jun 27, 2026 at 03:44:13PM +0100, Harsimran Singh Tungal wrote:
> Add the FF-A runtime infrastructure needed after ExitBootServices() so
> EFI runtime services can continue to use the FF-A transport layer.
> Introduce drivers/firmware/arm-ffa/arm-ffa-runtime.c and
> include/arm_ffa_runtime.h with runtime-resident FF-A helpers for
> direct messaging, SMC invocation, and error translation. Add the
> sandbox runtime SMC wrapper, the ARM_FFA_RT_MODE Kconfig option, and
> the ExitBootServices hook that copies the required FF-A runtime data
> into resident storage before enabling the runtime context.
> 
> Tag the runtime code and data with __efi_runtime and
> __efi_runtime_data so they remain available after
> ExitBootServices().
> 
> Reviewed-by: Simon Glass <sjg at chromium.org>
> Signed-off-by: Harsimran Singh Tungal <harsimransingh.tungal at arm.com>
> 
> ----
> Changelog:
> ===============
> 
> v3:
> 
> Simon:
> 
> - Move ExitBootServices event registration to the end of probe
> - Use an early-return guard and log missing-context with log_warning()
> - Rename the runtime-context helpers to the ffa_runtime_context_* form
> - Drop the unrelated whitespace-only hunk
> - Fix commit message styling
> 
> v2:
> 
> Simon:
> 
> - Leave runtime mode disabled if private data is missing
>   and update the log message
> - Remove unused global-data plumbing
> - Switch to `IS_ENABLED(CONFIG_ARM_FFA_RT_MODE)`
> - Fix style issues
> - Register the ExitBootServices event earlier in probe
> - Keep the runtime-enabled flag separate from copied boot time data
> 
> Signed-off-by: Harsimran Singh Tungal <harsimransingh.tungal at arm.com>

Acked-by: Abdellatif El Khlifi <abdellatif.elkhlifi at arm.com>