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From:   Stephan Gerhold <stephan@gerhold.net>
Date:   Thu, 15 Jun 2023 18:50:40 +0200
Subject: [PATCH v3 07/13] soc: qcom: smem: Add qcom_smem_is_available()
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To:     Bjorn Andersson <andersson@kernel.org>
Cc:     Andy Gross <agross@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Mathieu Poirier <mathieu.poirier@linaro.org>,
        linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-remoteproc@vger.kernel.org,
        Stephan Gerhold <stephan@gerhold.net>
Precedence: bulk

Avoid having to look up a dummy item from SMEM to detect if it is
already available or if we need to defer probing.

Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
---
 drivers/soc/qcom/smem.c       | 11 +++++++++++
 include/linux/soc/qcom/smem.h |  1 +
 2 files changed, 12 insertions(+)

diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
index b0d59e815c3b..29193151cf4c 100644
--- a/drivers/soc/qcom/smem.c
+++ b/drivers/soc/qcom/smem.c
@@ -359,6 +359,17 @@ static struct qcom_smem *__smem;
 /* Timeout (ms) for the trylock of remote spinlocks */
 #define HWSPINLOCK_TIMEOUT	1000
 
+/**
+ * qcom_smem_is_available() - Check if SMEM is available
+ *
+ * Return: true if SMEM is available, false otherwise.
+ */
+bool qcom_smem_is_available(void)
+{
+	return !!__smem;
+}
+EXPORT_SYMBOL(qcom_smem_is_available);
+
 static int qcom_smem_alloc_private(struct qcom_smem *smem,
 				   struct smem_partition *part,
 				   unsigned item,
diff --git a/include/linux/soc/qcom/smem.h b/include/linux/soc/qcom/smem.h
index 223db6a9c733..a36a3b9d4929 100644
--- a/include/linux/soc/qcom/smem.h
+++ b/include/linux/soc/qcom/smem.h
@@ -4,6 +4,7 @@
 
 #define QCOM_SMEM_HOST_ANY -1
 
+bool qcom_smem_is_available(void);
 int qcom_smem_alloc(unsigned host, unsigned item, size_t size);
 void *qcom_smem_get(unsigned host, unsigned item, size_t *size);
 

-- 
2.40.1