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iommufd: Use the domain_alloc_user() op for domain allocation

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Make IOMMUFD use iommu_domain_alloc_user() by default for iommu_domain
creation. IOMMUFD needs to support iommu_domain allocation with parameters
from userspace in nested support, and a driver is expected to implement
everything under this op.

If the iommu driver doesn't provide domain_alloc_user callback then
IOMMUFD falls back to use iommu_domain_alloc() with an UNMANAGED type if
possible.

Link: https://lore.kernel.org/r/20230928071528.26258-3-yi.l.liu@intel.com
Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Co-developed-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Yi Liu
2023-09-28 00:15:24 -07:00
committed by Jason Gunthorpe
parent 909f4abd10
commit 7975b72208
1 changed files with 15 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/iommu/iommufd/hw_pagetable.c
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@@ -5,6 +5,7 @@
#include <linux/iommu.h>
#include <uapi/linux/iommufd.h>
#include "../iommu-priv.h"
#include "iommufd_private.h"
void iommufd_hw_pagetable_destroy(struct iommufd_object *obj)
@@ -74,6 +75,7 @@ struct iommufd_hw_pagetable *
iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
struct iommufd_device *idev, bool immediate_attach)
{
const struct iommu_ops *ops = dev_iommu_ops(idev->dev);
struct iommufd_hw_pagetable *hwpt;
int rc;
@@ -88,10 +90,19 @@ iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
refcount_inc(&ioas->obj.users);
hwpt->ioas = ioas;
hwpt->domain = iommu_domain_alloc(idev->dev->bus);
if (!hwpt->domain) {
rc = -ENOMEM;
goto out_abort;
if (ops->domain_alloc_user) {
hwpt->domain = ops->domain_alloc_user(idev->dev, 0);
if (IS_ERR(hwpt->domain)) {
rc = PTR_ERR(hwpt->domain);
hwpt->domain = NULL;
goto out_abort;
}
} else {
hwpt->domain = iommu_domain_alloc(idev->dev->bus);
if (!hwpt->domain) {
rc = -ENOMEM;
goto out_abort;
}
}
/*