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Commit 6d361c1d authored by Alex Elder's avatar Alex Elder Committed by Andy Gross
Browse files

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: default avatarAlex Elder <elder@linaro.org>
Reviewed-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: default avatarAndy Gross <andy.gross@linaro.org>
parent 7df5ff25

drivers/soc/qcom/smem.c

+27 −0
Original line number Diff line number Diff line
@@ -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;

include/linux/soc/qcom/smem.h

+2 −0
Original line number Diff line number Diff line
@@ -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