Commit cacffb7f authored by Isaac J. Manjarres's avatar Isaac J. Manjarres Committed by Joerg Roedel
Browse files

iommu: Add an unmap_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 unmap a virtually contiguous
range of pages of the same size.

For IOMMU drivers that do not specify an unmap_pages() callback,
the existing logic of unmapping 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>
Signed-off-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/1623850736-389584-3-git-send-email-quic_c_gdjako@quicinc.com


Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 374c1559

include/linux/iommu.h

+4 −0
Original line number Diff line number Diff line
@@ -181,6 +181,7 @@ struct iommu_iotlb_gather { 
 * @detach_dev: detach device from an iommu domain

 * @map: map a physically contiguous memory region 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

 * @iotlb_sync_map: Sync mappings created recently using @map to the hardware

 * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
@@ -231,6 +232,9 @@ struct iommu_ops { 
		   phys_addr_t paddr, size_t size, int prot, gfp_t gfp);

	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,

			      size_t pgsize, size_t pgcount,

			      struct iommu_iotlb_gather *iotlb_gather);

	void (*flush_iotlb_all)(struct iommu_domain *domain);

	void (*iotlb_sync_map)(struct iommu_domain *domain, unsigned long iova,

			       size_t size);