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authorAlex Elder <elder@linaro.org>2018-04-25 18:18:20 +0300
committerAndy Gross <andy.gross@linaro.org>2018-05-25 23:53:59 +0300
commit6d361c1db7b69fddf5748cf212169ab57bb13a6e (patch)
treeccc3ad35e9a2a9e14c6062c2641d929e082e324b
parent7df5ff258bd27900d516fea88da10d05602bf8c7 (diff)
downloadlinux-6d361c1db7b69fddf5748cf212169ab57bb13a6e.tar.xz
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@linaro.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Andy Gross <andy.gross@linaro.org>
-rw-r--r--drivers/soc/qcom/smem.c27
-rw-r--r--include/linux/soc/qcom/smem.h2
2 files changed, 29 insertions, 0 deletions
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