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iommu/amd: Add support for using AMD IOMMU v2 page table for DMA-API 

Introduce init function for setting up DMA domain for DMA-API with
the IOMMU v2 page table.

Co-developed-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20220825063939.8360-9-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Suravee Suthikulpanit 2022-08-25 06:39:38 +00:00 committed by Joerg Roedel
parent 643feb0072
commit 4db6c41f09
1 changed files with 25 additions and 0 deletions
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25
drivers/iommu/amd/iommu.c
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@ -1653,6 +1653,10 @@ static void do_attach(struct iommu_dev_data *dev_data,
domain->dev_iommu[iommu->index] += 1; domain->dev_iommu[iommu->index] += 1;
domain->dev_cnt += 1; domain->dev_cnt += 1;
/* Override supported page sizes */
if (domain->flags & PD_GIOV_MASK)
domain->domain.pgsize_bitmap = AMD_IOMMU_PGSIZES_V2;
/* Update device table */ /* Update device table */
set_dte_entry(iommu, dev_data->devid, domain, set_dte_entry(iommu, dev_data->devid, domain,
ats, dev_data->iommu_v2); ats, dev_data->iommu_v2);
@ -2032,6 +2036,24 @@ static int protection_domain_init_v1(struct protection_domain *domain, int mode)
return 0; return 0;
} }
static int protection_domain_init_v2(struct protection_domain *domain)
{
spin_lock_init(&domain->lock);
domain->id = domain_id_alloc();
if (!domain->id)
return -ENOMEM;
INIT_LIST_HEAD(&domain->dev_list);
domain->flags |= PD_GIOV_MASK;
if (domain_enable_v2(domain, 1)) {
domain_id_free(domain->id);
return -ENOMEM;
}
return 0;
}
static struct protection_domain *protection_domain_alloc(unsigned int type) static struct protection_domain *protection_domain_alloc(unsigned int type)
{ {
struct io_pgtable_ops *pgtbl_ops; struct io_pgtable_ops *pgtbl_ops;
@ -2059,6 +2081,9 @@ static struct protection_domain *protection_domain_alloc(unsigned int type)
case AMD_IOMMU_V1: case AMD_IOMMU_V1:
ret = protection_domain_init_v1(domain, mode); ret = protection_domain_init_v1(domain, mode);
break; break;
case AMD_IOMMU_V2:
ret = protection_domain_init_v2(domain);
break;
default: default:
ret = -EINVAL; ret = -EINVAL;
} }