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Subject[PATCH 4.4 37/75] arm/arm64: smccc: Add SMCCC-specific return codes
Date
From: Marc Zyngier <marc.zyngier@arm.com>

commit eff0e9e1078ea7dc1d794dc50e31baef984c46d7 upstream.

We've so far used the PSCI return codes for SMCCC because they
were extremely similar. But with the new ARM DEN 0070A specification,
"NOT_REQUIRED" (-2) is clashing with PSCI's "PSCI_RET_INVALID_PARAMS".

Let's bite the bullet and add SMCCC specific return codes. Users
can be repainted as and when required.

Acked-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
include/linux/arm-smccc.h | 5 +++++
1 file changed, 5 insertions(+)

--- a/include/linux/arm-smccc.h
+++ b/include/linux/arm-smccc.h
@@ -264,5 +264,10 @@ asmlinkage void arm_smccc_hvc(unsigned l
*/
#define arm_smccc_1_1_hvc(...) __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__)

+/* Return codes defined in ARM DEN 0070A */
+#define SMCCC_RET_SUCCESS 0
+#define SMCCC_RET_NOT_SUPPORTED -1
+#define SMCCC_RET_NOT_REQUIRED -2
+
#endif /*__ASSEMBLY__*/
#endif /*__LINUX_ARM_SMCCC_H*/

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