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

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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: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Link: https://lore.kernel.org/r/20240703101604.2576-2-shameerali.kolothum.thodi@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Shameer Kolothum 2024-07-03 11:16:00 +01:00 committed by Will Deacon
parent 9796cf9b3e
commit 52acd7d8a4
1 changed files with 31 additions and 2 deletions
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33
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
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@ -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,