Commit 910c4406 authored by Isaac J. Manjarres's avatar Isaac J. Manjarres Committed by Joerg Roedel
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iommu: Add a map_pages() op for IOMMU drivers 



Add a callback for IOMMU drivers to provide a path for the
IOMMU framework to call into an IOMMU driver, which can
call into the io-pgtable code, to map a physically contiguous
rnage of pages of the same size.

For IOMMU drivers that do not specify a map_pages() callback,
the existing logic of mapping memory one page block at a time
will be used.

Signed-off-by: default avatarIsaac J. Manjarres <isaacm@codeaurora.org>
Suggested-by: default avatarWill Deacon <will@kernel.org>
Acked-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: default avatarGeorgi Djakov <quic_c_gdjako@quicinc.com>
Link: https://lore.kernel.org/r/1623850736-389584-5-git-send-email-quic_c_gdjako@quicinc.com


Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent ca073b55

include/linux/iommu.h

+5 −0
Original line number Diff line number Diff line
@@ -180,6 +180,8 @@ struct iommu_iotlb_gather { 
 * @attach_dev: attach device to an iommu domain

 * @detach_dev: detach device from an iommu domain

 * @map: map a physically contiguous memory region to an iommu domain

 * @map_pages: map a physically contiguous set of pages of the same size to

 *             an iommu domain.

 * @unmap: unmap a physically contiguous memory region from an iommu domain

 * @unmap_pages: unmap a number of pages of the same size from an iommu domain

 * @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain
@@ -230,6 +232,9 @@ struct iommu_ops { 
	void (*detach_dev)(struct iommu_domain *domain, struct device *dev);

	int (*map)(struct iommu_domain *domain, unsigned long iova,

		   phys_addr_t paddr, size_t size, int prot, gfp_t gfp);

	int (*map_pages)(struct iommu_domain *domain, unsigned long iova,

			 phys_addr_t paddr, size_t pgsize, size_t pgcount,

			 int prot, gfp_t gfp, size_t *mapped);

	size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,

		     size_t size, struct iommu_iotlb_gather *iotlb_gather);

	size_t (*unmap_pages)(struct iommu_domain *domain, unsigned long iova,