diff options
| author | Alex Elder <elder@linaro.org> | 2018-04-25 18:18:20 +0300 |
|---|---|---|
| committer | Andy Gross <andy.gross@linaro.org> | 2018-05-25 23:53:59 +0300 |
| commit | 6d361c1db7b69fddf5748cf212169ab57bb13a6e (patch) | |
| tree | ccc3ad35e9a2a9e14c6062c2641d929e082e324b | |
| parent | 7df5ff258bd27900d516fea88da10d05602bf8c7 (diff) | |
| download | linux-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.c | 27 | ||||
| -rw-r--r-- | include/linux/soc/qcom/smem.h | 2 |
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 |