linux-kernel - [PATCH 4/5] firmware: psci: Add function to fetch SMCCC version

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Date:   Thu, 30 Apr 2020 12:48:13 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Sudeep Holla <sudeep.holla@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Steven Price <steven.price@....com>,
        linux-kernel@...r.kernel.org, harb@...erecomputing.com
Subject: [PATCH 4/5] firmware: psci: Add function to fetch SMCCC version

For backward compatibility reasons, PSCI maintains SMCCC version as
SMCCC didn't provide ARM_SMCCC_VERSION_FUNC_ID until v1.1

Let us provide accessors to fetch the SMCCC version in PSCI so that
other SMCCC v1.1+ features can use it.

Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
 drivers/firmware/psci/psci.c | 5 +++++
 include/linux/arm-smccc.h    | 9 +++++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c
index 6a56d7196697..04426e16fee6 100644
--- a/drivers/firmware/psci/psci.c
+++ b/drivers/firmware/psci/psci.c
@@ -65,6 +65,11 @@ enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void)
 	return psci_ops.conduit;
 }
 
+u32 arm_smccc_get_version(void)
+{
+	return psci_ops.smccc_version;
+}
+
 typedef unsigned long (psci_fn)(unsigned long, unsigned long,
 				unsigned long, unsigned long);
 static psci_fn *invoke_psci_fn;
diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h
index 9d9a2e42e919..d6b0f4acc707 100644
--- a/include/linux/arm-smccc.h
+++ b/include/linux/arm-smccc.h
@@ -98,6 +98,15 @@ enum arm_smccc_conduit {
  */
 enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void);
 
+/**
+ * arm_smccc_get_version()
+ *
+ * Returns the version to be used for SMCCCv1.1 or later.
+ *
+ * When SMCCCv1.1 or above is not present, assumes and returns SMCCCv1.0.
+ */
+u32 arm_smccc_get_version(void);
+
 /**
  * struct arm_smccc_res - Result from SMC/HVC call
  * @a0-a3 result values from registers 0 to 3
-- 
2.17.1