Commit 52acd7d8 authored by Shameer Kolothum's avatar Shameer Kolothum Committed by Will Deacon
Browse files

iommu/arm-smmu-v3: Add support for domain_alloc_user fn 



This will be used by iommufd for allocating usr managed domains and is
also required when we add support for iommufd based dirty tracking
support.

Reviewed-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Reviewed-by: default avatarNicolin Chen <nicolinc@nvidia.com>
Reviewed-by: default avatarKevin Tian <kevin.tian@intel.com>
Signed-off-by: default avatarShameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Link: https://lore.kernel.org/r/20240703101604.2576-2-shameerali.kolothum.thodi@huawei.com


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent 9796cf9b

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c

+31 −2
Original line number Diff line number Diff line
@@ -36,6 +36,8 @@ module_param(disable_msipolling, bool, 0444); 
MODULE_PARM_DESC(disable_msipolling,

	"Disable MSI-based polling for CMD_SYNC completion.");



static struct iommu_ops arm_smmu_ops;



enum arm_smmu_msi_index {

	EVTQ_MSI_INDEX,

	GERROR_MSI_INDEX,
@@ -3020,6 +3022,34 @@ static struct iommu_domain arm_smmu_blocked_domain = { 
	.ops = &arm_smmu_blocked_ops,

};



static struct iommu_domain *

arm_smmu_domain_alloc_user(struct device *dev, u32 flags,

			   struct iommu_domain *parent,

			   const struct iommu_user_data *user_data)

{

	struct arm_smmu_master *master = dev_iommu_priv_get(dev);

	struct arm_smmu_domain *smmu_domain;

	int ret;



	if (flags || parent || user_data)

		return ERR_PTR(-EOPNOTSUPP);



	smmu_domain = arm_smmu_domain_alloc();

	if (!smmu_domain)

		return ERR_PTR(-ENOMEM);



	smmu_domain->domain.type = IOMMU_DOMAIN_UNMANAGED;

	smmu_domain->domain.ops = arm_smmu_ops.default_domain_ops;

	ret = arm_smmu_domain_finalise(smmu_domain, master->smmu);

	if (ret)

		goto err_free;

	return &smmu_domain->domain;



err_free:

	kfree(smmu_domain);

	return ERR_PTR(ret);

}



static int arm_smmu_map_pages(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)
@@ -3190,8 +3220,6 @@ static void arm_smmu_remove_master(struct arm_smmu_master *master) 
	kfree(master->streams);

}



static struct iommu_ops arm_smmu_ops;



static struct iommu_device *arm_smmu_probe_device(struct device *dev)

{

	int ret;
@@ -3399,6 +3427,7 @@ static struct iommu_ops arm_smmu_ops = { 
	.capable		= arm_smmu_capable,

	.domain_alloc_paging    = arm_smmu_domain_alloc_paging,

	.domain_alloc_sva       = arm_smmu_sva_domain_alloc,

	.domain_alloc_user	= arm_smmu_domain_alloc_user,

	.probe_device		= arm_smmu_probe_device,

	.release_device		= arm_smmu_release_device,

	.device_group		= arm_smmu_device_group,