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iommufd/viommu: Allow driver-specific user data for a vIOMMU object

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The new type of vIOMMU for tegra241-cmdqv driver needs a driver-specific
user data. So, add data_len/uptr to the iommu_viommu_alloc uAPI and pass
it in via the viommu_init iommu op.

Link: https://patch.msgid.link/r/2315b0e164b355746387e960745ac9154caec124.1752126748.git.nicolinc@nvidia.com
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Acked-by: Pranjal Shrivastava <praan@google.com>
Acked-by: Alok Tiwari <alok.a.tiwari@oracle.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Nicolin Chen 2025-07-09 22:58:59 -07:00 committed by Jason Gunthorpe
parent c3436d42f8
commit 1976cdf61c
2 changed files with 13 additions and 1 deletions
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8
drivers/iommu/iommufd/viommu.c
View File

@ -17,6 +17,11 @@ void iommufd_viommu_destroy(struct iommufd_object *obj)
int iommufd_viommu_alloc_ioctl(struct iommufd_ucmd *ucmd)
{
struct iommu_viommu_alloc *cmd = ucmd->cmd;
const struct iommu_user_data user_data = {
.type = cmd->type,
.uptr = u64_to_user_ptr(cmd->data_uptr),
.len = cmd->data_len,
};
struct iommufd_hwpt_paging *hwpt_paging;
struct iommufd_viommu *viommu;
struct iommufd_device *idev;
@ -84,7 +89,8 @@ int iommufd_viommu_alloc_ioctl(struct iommufd_ucmd *ucmd)
*/
viommu->iommu_dev = __iommu_get_iommu_dev(idev->dev);
rc = ops->viommu_init(viommu, hwpt_paging->common.domain, NULL);
rc = ops->viommu_init(viommu, hwpt_paging->common.domain,
user_data.len ? &user_data : NULL);
if (rc)
goto out_put_hwpt;

6
include/uapi/linux/iommufd.h
View File

@ -965,6 +965,9 @@ enum iommu_viommu_type {
* @dev_id: The device's physical IOMMU will be used to back the virtual IOMMU
* @hwpt_id: ID of a nesting parent HWPT to associate to
* @out_viommu_id: Output virtual IOMMU ID for the allocated object
* @data_len: Length of the type specific data
* @__reserved: Must be 0
* @data_uptr: User pointer to a driver-specific virtual IOMMU data
*
* Allocate a virtual IOMMU object, representing the underlying physical IOMMU's
* virtualization support that is a security-isolated slice of the real IOMMU HW
@ -985,6 +988,9 @@ struct iommu_viommu_alloc {
__u32 dev_id;
__u32 hwpt_id;
__u32 out_viommu_id;
__u32 data_len;
__u32 __reserved;
__aligned_u64 data_uptr;
};
#define IOMMU_VIOMMU_ALLOC _IO(IOMMUFD_TYPE, IOMMUFD_CMD_VIOMMU_ALLOC)