linux-kernel - [PATCH] soc: qcom: smem: introduce qcom_smem_virt_to

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Date:   Wed, 25 Apr 2018 10:18:20 -0500
From:   Alex Elder <elder@...aro.org>
To:     andy.gross@...aro.org
Cc:     clew@...eaurora.org, aneela@...eaurora.org, david.brown@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] soc: qcom: smem: introduce qcom_smem_virt_to_phys()

Create function qcom_smem_virt_to_phys(), which returns the physical
address corresponding to a given SMEM item's virtual address.  This
feature is required for a driver that will soon be out for review.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/soc/qcom/smem.c       | 27 +++++++++++++++++++++++++++
 include/linux/soc/qcom/smem.h |  2 ++
 2 files changed, 29 insertions(+)

diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
index 7d9a43da5084..70b2ee80d6bd 100644
--- a/drivers/soc/qcom/smem.c
+++ b/drivers/soc/qcom/smem.c
@@ -655,6 +655,33 @@ int qcom_smem_get_free_space(unsigned host)
 }
 EXPORT_SYMBOL(qcom_smem_get_free_space);
 
+/**
+ * qcom_smem_virt_to_phys() - return the physical address associated
+ * with an smem item pointer (previously returned by qcom_smem_get()
+ * @p:	the virtual address to convert
+ *
+ * Returns 0 if the pointer provided is not within any smem region.
+ */
+phys_addr_t qcom_smem_virt_to_phys(void *p)
+{
+	unsigned i;
+
+	for (i = 0; i < __smem->num_regions; i++) {
+		struct smem_region *region = &__smem->regions[i];
+
+		if (p < region->virt_base)
+			continue;
+		if (p < region->virt_base + region->size) {
+			u64 offset = p - region->virt_base;
+
+			return (phys_addr_t)region->aux_base + offset;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(qcom_smem_virt_to_phys);
+
 static int qcom_smem_get_sbl_version(struct qcom_smem *smem)
 {
 	struct smem_header *header;
diff --git a/include/linux/soc/qcom/smem.h b/include/linux/soc/qcom/smem.h
index c1657ed27b30..86e1b358688a 100644
--- a/include/linux/soc/qcom/smem.h
+++ b/include/linux/soc/qcom/smem.h
@@ -9,4 +9,6 @@ void *qcom_smem_get(unsigned host, unsigned item, size_t *size);
 
 int qcom_smem_get_free_space(unsigned host);
 
+phys_addr_t qcom_smem_virt_to_phys(void *p);
+
 #endif
-- 
2.14.1