soc: qcom: smem: Add qcom_smem_is_available()

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>
Link: https://lore.kernel.org/r/20230531-rpm-rproc-v3-7-a07dcdefd918@gerhold.net
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
index 776096b..aa4a199 100644 (file)
--- 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 223db6a..a36a3b9 100644 (file)
--- 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);