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FROMLIST: iommu: Introduce map_sg() as an IOMMU op for IOMMU drivers

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Add support for IOMMU drivers to have their own map_sg() callbacks.
This completes the path for having iommu_map_sg() invoke an IOMMU
driver's map_sg() callback, which can then invoke the io-pgtable
map_sg() callback with the entire scatter-gather list, so that it
can be processed entirely in the io-pgtable layer.

For IOMMU drivers that do not provide a callback, the default
implementation of iterating through the scatter-gather list, while
calling iommu_map() will be used.

Bug: 190544587
Link: https://lore.kernel.org/linux-iommu/1610376862-927-1-git-send-email-isaacm@codeaurora.org/T/#t
Change-Id: I3d5a8a9e8648649d8dcdda3fa1df41d72f87a528
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 23:01:19 -08:00
committed by Todd Kjos
parent 536fdf792d
commit d2ca738f11
2 changed files with 17 additions and 0 deletions
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12
drivers/iommu/iommu.c
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@@ -2666,6 +2666,18 @@ static ssize_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
unsigned int i = 0;
int ret;
if (ops->map_sg) {
ret = ops->map_sg(domain, iova, sg, nents, prot, gfp, &mapped);
if (ops->iotlb_sync_map)
ops->iotlb_sync_map(domain, iova, mapped);
if (ret)
goto out_err;
return mapped;
}
while (i <= nents) {
phys_addr_t s_phys = sg_phys(sg);