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iommu/arm-smmu: Implement DOMAIN_ATTR_PGTBL_INFO

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The DOMAIN_ATTR_PGTBL_INFO attribute will be useful in implementing DMA
APIs that can leverage the fast page table mapping routines.  Implement
it.

CRs-Fixed: 997751
Change-Id: Id3acec0089b126e7d6ad44d8d322bf473614f716
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
This commit is contained in:
Mitchel Humpherys 2016-02-12 14:18:02 -08:00 • committed by Jeevan Shriram
parent c4b40af5dc
commit d740dc5f65
1 changed files with 11 additions and 0 deletions
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11
drivers/iommu/arm-smmu.c
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@ -2924,6 +2924,17 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
& (1 << DOMAIN_ATTR_FAST));
ret = 0;
break;
case DOMAIN_ATTR_PGTBL_INFO: {
struct iommu_pgtbl_info *info = data;
if (!(smmu_domain->attributes & (1 << DOMAIN_ATTR_FAST))) {
ret = -ENODEV;
break;
}
info->pmds = smmu_domain->pgtbl_cfg.av8l_fast_cfg.pmds;
ret = 0;
break;
}
default:
ret = -ENODEV;
break;