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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: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Sudeep Holla 2022-09-07 15:52:34 +01:00
parent 55bf84fd0a
commit cb1f4c2c15
1 changed files with 26 additions and 0 deletions
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26
drivers/firmware/arm_ffa/driver.c
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@ -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;