Commit cb1f4c2c authored by Sudeep Holla's avatar Sudeep Holla
Browse files

firmware: arm_ffa: Add support for querying FF-A features 

Add support for FFA_FEATURES to discover properties supported at the
FF-A interface. This interface can be used to query:
 - If an FF-A interface is implemented by the component at the higher EL,
 - If an implemented FF-A interface also implements any optional features
   described in its interface definition, and
 - Any implementation details exported by an implemented FF-A interface
   as described in its interface definition.

Link: https://lore.kernel.org/r/20220907145240.1683088-5-sudeep.holla@arm.com


Reviewed-by: default avatarJens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: default avatarSudeep Holla <sudeep.holla@arm.com>
parent 55bf84fd

drivers/firmware/arm_ffa/driver.c

+26 −0
Original line number Diff line number Diff line
@@ -571,6 +571,32 @@ static int ffa_memory_reclaim(u64 g_handle, u32 flags) 
	return 0;

}



static int ffa_features(u32 func_feat_id, u32 input_props,

			u32 *if_props_1, u32 *if_props_2)

{

	ffa_value_t id;



	if (!ARM_SMCCC_IS_FAST_CALL(func_feat_id) && input_props) {

		pr_err("%s: Invalid Parameters: %x, %x", __func__,

		       func_feat_id, input_props);

		return ffa_to_linux_errno(FFA_RET_INVALID_PARAMETERS);

	}



	invoke_ffa_fn((ffa_value_t){

		.a0 = FFA_FEATURES, .a1 = func_feat_id, .a2 = input_props,

		}, &id);



	if (id.a0 == FFA_ERROR)

		return ffa_to_linux_errno((int)id.a2);



	if (if_props_1)

		*if_props_1 = id.a2;

	if (if_props_2)

		*if_props_2 = id.a3;



	return 0;

}



static u32 ffa_api_version_get(void)

{

	return drv_info->version;