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BACKPORT: FROMLIST: iommu/io-pgtable: Introduce map_pages() as a page table op

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Mapping memory into io-pgtables follows the same semantics
that unmapping memory used to follow (i.e. a buffer will be
mapped one page block per call to the io-pgtable code). This
means that it can be optimized in the same way that unmapping
memory was, so add a map_pages() callback to the io-pgtable
ops structure, so that a range of pages of the same size
can be mapped within the same call.

Bug: 178537788
Change-Id: I5f2a86f21216f26b2cc2f70904c2968467c5363a
Link: https://lore.kernel.org/linux-iommu/20210408171402.12607-1-isaacm@codeaurora.org/T/#t
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
Suggested-by: Will Deacon <will@kernel.org>
This commit is contained in:
Isaac J. Manjarres 2021-04-01 13:33:01 -07:00 committed by Todd Kjos
parent ced8a6da9c
commit ba575b2222
1 changed files with 4 additions and 0 deletions
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4
include/linux/io-pgtable.h
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@ -138,6 +138,7 @@ struct io_pgtable_cfg {
* struct io_pgtable_ops - Page table manipulation API for IOMMU drivers.
*
* @map: Map a physically contiguous memory region.
* @map_pages: Map a physically contiguous range of pages of the same size.
* @map_sg: Map a scatter-gather list of physically contiguous memory
* chunks. The mapped pointer argument is used to store how
* many bytes are mapped.
@ -151,6 +152,9 @@ 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, gfp_t gfp);
int (*map_pages)(struct io_pgtable_ops *ops, unsigned long iova,
phys_addr_t paddr, size_t pgsize, size_t pgcount,
int prot, gfp_t gfp, size_t *mapped);
int (*map_sg)(struct io_pgtable_ops *ops, unsigned long iova,
struct scatterlist *sg, unsigned int nents, int prot,
gfp_t gfp, size_t *mapped);