linux-kernel - [PATCH v3 6/7] firmware: smccc: Add function to fetch SMCCC version

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Date:   Wed,  6 May 2020 17:44:10 +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, Arnd Bergmann <arnd@...db.de>,
        harb@...erecomputing.com
Subject: [PATCH v3 6/7] firmware: smccc: 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.

Reviewed-by: Steven Price <steven.price@....com>
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
 drivers/firmware/smccc/smccc.c | 4 ++++
 include/linux/arm-smccc.h      | 9 +++++++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/firmware/smccc/smccc.c b/drivers/firmware/smccc/smccc.c
index 488699aae24f..672974df0dfe 100644
--- a/drivers/firmware/smccc/smccc.c
+++ b/drivers/firmware/smccc/smccc.c
@@ -24,3 +24,7 @@ enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void)
 	return smccc_conduit;
 }
 
+u32 arm_smccc_version_get(void)
+{
+	return smccc_version;
+}
diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h
index 11fb20bfa8f7..8dd54dad1ec5 100644
--- a/include/linux/arm-smccc.h
+++ b/include/linux/arm-smccc.h
@@ -109,6 +109,15 @@ void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit);
  */
 enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void);
 
+/**
+ * arm_smccc_version_get()
+ *
+ * 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_version_get(void);
+
 /**
  * struct arm_smccc_res - Result from SMC/HVC call
  * @a0-a3 result values from registers 0 to 3
-- 
2.17.1