Commit b01b1257 authored by Jason Gunthorpe's avatar Jason Gunthorpe Committed by Joerg Roedel
Browse files

iommu/mtk_iommu: Add an IOMMU_IDENTITIY_DOMAIN 



This brings back the ops->detach_dev() code that commit
1b932ced ("iommu: Remove detach_dev callbacks") deleted and turns it
into an IDENTITY domain.

Reviewed-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: default avatarJerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/18-v8-81230027b2fa+9d-iommu_all_defdom_jgg@nvidia.com


Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 666c9f1e

drivers/iommu/mtk_iommu.c

+23 −0
Original line number Diff line number Diff line
@@ -777,6 +777,28 @@ static int mtk_iommu_attach_device(struct iommu_domain *domain, 
	return ret;

}



static int mtk_iommu_identity_attach(struct iommu_domain *identity_domain,

				     struct device *dev)

{

	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);

	struct mtk_iommu_data *data = dev_iommu_priv_get(dev);



	if (domain == identity_domain || !domain)

		return 0;



	mtk_iommu_config(data, dev, false, 0);

	return 0;

}



static struct iommu_domain_ops mtk_iommu_identity_ops = {

	.attach_dev = mtk_iommu_identity_attach,

};



static struct iommu_domain mtk_iommu_identity_domain = {

	.type = IOMMU_DOMAIN_IDENTITY,

	.ops = &mtk_iommu_identity_ops,

};



static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova,

			 phys_addr_t paddr, size_t pgsize, size_t pgcount,

			 int prot, gfp_t gfp, size_t *mapped)
@@ -996,6 +1018,7 @@ static void mtk_iommu_get_resv_regions(struct device *dev, 
}



static const struct iommu_ops mtk_iommu_ops = {

	.identity_domain = &mtk_iommu_identity_domain,

	.domain_alloc	= mtk_iommu_domain_alloc,

	.probe_device	= mtk_iommu_probe_device,

	.release_device	= mtk_iommu_release_device,