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soc: qcom: smem: introduce qcom_smem_virt_to_phys()

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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>
This commit is contained in:
Alex Elder 2018-04-25 10:18:20 -05:00 committed by Andy Gross
parent 7df5ff258b
commit 6d361c1db7
2 changed files with 29 additions and 0 deletions
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27
drivers/soc/qcom/smem.c
View File

@ -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;

2
include/linux/soc/qcom/smem.h
View File

@ -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