Commit 9916c5dc authored Apr 23, 2015 by Mitchel Humpherys Committed by Matt Wagantall Jun 05, 2015

iommu: io-pgtable: add .map_sg op to io_pgtable_ops



The default implementation of map_sg (provided by default_iommu_map_sg
from the IOMMU API layer) actually just calls iommu_map repeatedly.
Often times there are locks or other initial setup in the implementation
of iommu_map, so there's opportunity to drastically improve performance
by factoring that out of the loop.  For this reason, io-pgtable
providers might want to implement .map_sg.  Add the declaration to the
io_pgtable_ops structure.

Change-Id: I5aa5e4e24a68e303ce2c005dc1dd0b33d5635ab3
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>

parent 031e4daf

drivers/iommu/io-pgtable.h

+4 −0

Original line number	Diff line number	Diff line
		#ifndef __IO_PGTABLE_H
		#define __IO_PGTABLE_H

		#include <linux/scatterlist.h>

		/*
		* Public API for use by IOMMU drivers
		*/
		@@ -78,6 +80,8 @@ struct io_pgtable_cfg {
		struct io_pgtable_ops {
		int (map)(struct io_pgtable_ops ops, unsigned long iova,
		phys_addr_t paddr, size_t size, int prot);
		int (map_sg)(struct io_pgtable_ops ops, unsigned long iova,
		struct scatterlist *sg, unsigned int nents, int prot);
		int (unmap)(struct io_pgtable_ops ops, unsigned long iova,
		size_t size);
		phys_addr_t (iova_to_phys)(struct io_pgtable_ops ops,