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

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While mapping a scatter-gather list, iommu_map_sg() calls
into the IOMMU driver through an indirect call, which can
call into the io-pgtable code through another indirect call.

This sequence of going through the IOMMU core code, the IOMMU
driver, and finally the io-pgtable code, occurs for every
element in the scatter-gather list, in the worse case, which
is not optimal.

Introduce a map_sg callback in the io-pgtable ops so that
IOMMU drivers can invoke it with the complete scatter-gather
list, so that it can be processed within the io-pgtable
code entirely, reducing the number of indirect calls, and
boosting overall iommu_map_sg() performance.

Bug: 190544587
Link: https://lore.kernel.org/linux-iommu/1610376862-927-1-git-send-email-isaacm@codeaurora.org/T/#t
Change-Id: I4b2088dd08eb97dcd94a6c6968082a3c4395351a
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
Tested-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Signed-off-by: Georgi Djakov <quic_c_gdjako@quicinc.com>
This commit is contained in:
Isaac J. Manjarres
2021-01-07 22:32:05 -08:00
committed by Todd Kjos
parent 46dfaf84ab
commit 536fdf792d
1 changed files with 6 additions and 0 deletions
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6
include/linux/io-pgtable.h
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@@ -145,6 +145,9 @@ struct io_pgtable_cfg {
*
* @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.
* @unmap: Unmap a physically contiguous memory region.
* @unmap_pages: Unmap a range of virtually contiguous pages of the same size.
* @iova_to_phys: Translate iova to physical address.
@@ -158,6 +161,9 @@ struct io_pgtable_ops {
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);
size_t (*unmap)(struct io_pgtable_ops *ops, unsigned long iova,
size_t size, struct iommu_iotlb_gather *gather);
size_t (*unmap_pages)(struct io_pgtable_ops *ops, unsigned long iova,