Commit 4db6c41f authored by Suravee Suthikulpanit's avatar Suravee Suthikulpanit Committed by Joerg Roedel
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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: default avatarVasant Hegde <vasant.hegde@amd.com>
Signed-off-by: default avatarVasant Hegde <vasant.hegde@amd.com>
Signed-off-by: default avatarSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20220825063939.8360-9-vasant.hegde@amd.com


Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 643feb00

drivers/iommu/amd/iommu.c

+25 −0
Original line number Diff line number Diff line
@@ -1653,6 +1653,10 @@ static void do_attach(struct iommu_dev_data *dev_data, 
	domain->dev_iommu[iommu->index] += 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 */

	set_dte_entry(iommu, dev_data->devid, domain,

		      ats, dev_data->iommu_v2);
@@ -2032,6 +2036,24 @@ static int protection_domain_init_v1(struct protection_domain *domain, int mode) 
	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)

{

	struct io_pgtable_ops *pgtbl_ops;
@@ -2059,6 +2081,9 @@ static struct protection_domain *protection_domain_alloc(unsigned int type) 
	case AMD_IOMMU_V1:

		ret = protection_domain_init_v1(domain, mode);

		break;

	case AMD_IOMMU_V2:

		ret = protection_domain_init_v2(domain);

		break;

	default:

		ret = -EINVAL;

	}