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From: Steven Price <steven.price@arm.com>
To: Marc Zyngier <maz@kernel.org>, Will Deacon <will@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu
Cc: "Steven Price" <steven.price@arm.com>,
	"Catalin Marinas" <catalin.marinas@arm.com>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>,
	"Russell King" <linux@armlinux.org.uk>,
	"James Morse" <james.morse@arm.com>,
	"Julien Thierry" <julien.thierry.kdev@gmail.com>,
	"Suzuki K Pouloze" <suzuki.poulose@arm.com>,
	"Mark Rutland" <mark.rutland@arm.com>,
	kvm@vger.kernel.org, linux-doc@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v2 7/9] arm/arm64: Provide a wrapper for SMCCC 1.1 calls
Date: Mon, 19 Aug 2019 15:04:34 +0100
Message-ID: <20190819140436.12207-8-steven.price@arm.com> (raw)
In-Reply-To: <20190819140436.12207-1-steven.price@arm.com>

SMCCC 1.1 calls may use either HVC or SMC depending on the PSCI
conduit. Rather than coding this in every call site provide a macro
which uses the correct instruction. The macro also handles the case
where no PSCI conduit is configured returning a not supported error
in res, along with returning the conduit used for the call.

This allow us to remove some duplicated code and will be useful later
when adding paravirtualized time hypervisor calls.

Signed-off-by: Steven Price <steven.price@arm.com>
Acked-by: Will Deacon <will@kernel.org>
---
 include/linux/arm-smccc.h | 44 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h
index e7f129f26ebd..eee1e832221d 100644
--- a/include/linux/arm-smccc.h
+++ b/include/linux/arm-smccc.h
@@ -303,6 +303,50 @@ asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
 #define SMCCC_RET_NOT_SUPPORTED			-1
 #define SMCCC_RET_NOT_REQUIRED			-2
 
+/* Like arm_smccc_1_1* but always returns SMCCC_RET_NOT_SUPPORTED.
+ * Used when the PSCI conduit is not defined. The empty asm statement
+ * avoids compiler warnings about unused variables.
+ */
+#define __fail_smccc_1_1(...)						\
+	do {								\
+		__declare_args(__count_args(__VA_ARGS__), __VA_ARGS__);	\
+		asm ("" __constraints(__count_args(__VA_ARGS__)));	\
+		if (___res)						\
+			___res->a0 = SMCCC_RET_NOT_SUPPORTED;		\
+	} while (0)
+
+/*
+ * arm_smccc_1_1_invoke() - make an SMCCC v1.1 compliant call
+ *
+ * This is a variadic macro taking one to eight source arguments, and
+ * an optional return structure.
+ *
+ * @a0-a7: arguments passed in registers 0 to 7
+ * @res: result values from registers 0 to 3
+ *
+ * This macro will make either an HVC call or an SMC call depending on the
+ * current PSCI conduit. If no valid conduit is available then -1
+ * (SMCCC_RET_NOT_SUPPORTED) is returned in @res.a0 (if supplied).
+ *
+ * The return value also provides the conduit that was used.
+ */
+#define arm_smccc_1_1_invoke(...) ({					\
+		int method = psci_ops.conduit;				\
+		switch (method) {					\
+		case PSCI_CONDUIT_HVC:					\
+			arm_smccc_1_1_hvc(__VA_ARGS__);			\
+			break;						\
+		case PSCI_CONDUIT_SMC:					\
+			arm_smccc_1_1_smc(__VA_ARGS__);			\
+			break;						\
+		default:						\
+			__fail_smccc_1_1(__VA_ARGS__);			\
+			method = PSCI_CONDUIT_NONE;			\
+			break;						\
+		}							\
+		method;							\
+	})
+
 /* Paravirtualised time calls (defined by ARM DEN0057A) */
 #define ARM_SMCCC_HV_PV_FEATURES				\
 	ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL,			\
-- 
2.20.1


  parent reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-19 14:04 [PATCH v2 0/9] arm64: Stolen time support Steven Price
2019-08-19 14:04 ` [PATCH v2 1/9] KVM: arm64: Document PV-time interface Steven Price
2019-08-19 14:04 ` [PATCH v2 2/9] KVM: arm/arm64: Factor out hypercall handling from PSCI code Steven Price
2019-08-19 14:04 ` [PATCH v2 3/9] KVM: arm64: Implement PV_FEATURES call Steven Price
2019-08-19 14:04 ` [PATCH v2 4/9] KVM: arm64: Support stolen time reporting via shared structure Steven Price
2019-08-19 16:40   ` Marc Zyngier
2019-08-21 10:27     ` Steven Price
2019-08-19 14:04 ` [PATCH v2 5/9] KVM: Allow kvm_device_ops to be const Steven Price
2019-08-19 14:04 ` [PATCH v2 6/9] KVM: arm64: Provide a PV_TIME device to user space Steven Price
2019-08-19 14:04 ` Steven Price [this message]
2019-08-19 14:04 ` [PATCH v2 8/9] arm/arm64: Make use of the SMCCC 1.1 wrapper Steven Price
2019-08-19 14:04 ` [PATCH v2 9/9] arm64: Retrieve stolen time as paravirtualized guest Steven Price

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