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iommufd: Share iommufd_hwpt_alloc with IOMMUFD_OBJ_HWPT_NESTED

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Allow iommufd_hwpt_alloc() to have a common routine but jump to different
allocators corresponding to different user input pt_obj types, either an
IOMMUFD_OBJ_IOAS for a PAGING hwpt or an IOMMUFD_OBJ_HWPT_PAGING as the
parent for a NESTED hwpt.

Also, move the "flags" validation to the hwpt allocator (paging), so that
later the hwpt_nested allocator can do its own separate flags validation.

Link: https://lore.kernel.org/r/20231026043938.63898-6-yi.l.liu@intel.com
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Nicolin Chen 2023-10-25 21:39:33 -07:00 committed by Jason Gunthorpe
parent 89db31635c
commit b5021cb264
1 changed files with 29 additions and 17 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

46
drivers/iommu/iommufd/hw_pagetable.c
View file

@ -82,6 +82,8 @@ iommufd_hwpt_paging_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
struct iommufd_device *idev, u32 flags,
bool immediate_attach)
{
const u32 valid_flags = IOMMU_HWPT_ALLOC_NEST_PARENT |
IOMMU_HWPT_ALLOC_DIRTY_TRACKING;
const struct iommu_ops *ops = dev_iommu_ops(idev->dev);
struct iommufd_hwpt_paging *hwpt_paging;
struct iommufd_hw_pagetable *hwpt;
@ -91,6 +93,8 @@ iommufd_hwpt_paging_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
if (flags && !ops->domain_alloc_user)
return ERR_PTR(-EOPNOTSUPP);
if (flags & ~valid_flags)
return ERR_PTR(-EOPNOTSUPP);
hwpt_paging = __iommufd_object_alloc(
ictx, hwpt_paging, IOMMUFD_OBJ_HWPT_PAGING, common.obj);
@ -167,35 +171,41 @@ iommufd_hwpt_paging_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
int iommufd_hwpt_alloc(struct iommufd_ucmd *ucmd)
{
struct iommu_hwpt_alloc *cmd = ucmd->cmd;
struct iommufd_hwpt_paging *hwpt_paging;
struct iommufd_hw_pagetable *hwpt;
struct iommufd_ioas *ioas = NULL;
struct iommufd_object *pt_obj;
struct iommufd_device *idev;
struct iommufd_ioas *ioas;
int rc;
if ((cmd->flags & ~(IOMMU_HWPT_ALLOC_NEST_PARENT |
IOMMU_HWPT_ALLOC_DIRTY_TRACKING)) ||
cmd->__reserved)
if (cmd->__reserved)
return -EOPNOTSUPP;
idev = iommufd_get_device(ucmd, cmd->dev_id);
if (IS_ERR(idev))
return PTR_ERR(idev);
ioas = iommufd_get_ioas(ucmd->ictx, cmd->pt_id);
if (IS_ERR(ioas)) {
rc = PTR_ERR(ioas);
pt_obj = iommufd_get_object(ucmd->ictx, cmd->pt_id, IOMMUFD_OBJ_ANY);
if (IS_ERR(pt_obj)) {
rc = -EINVAL;
goto out_put_idev;
}
mutex_lock(&ioas->mutex);
hwpt_paging = iommufd_hwpt_paging_alloc(ucmd->ictx, ioas, idev,
cmd->flags, false);
if (IS_ERR(hwpt_paging)) {
rc = PTR_ERR(hwpt_paging);
goto out_unlock;
if (pt_obj->type == IOMMUFD_OBJ_IOAS) {
struct iommufd_hwpt_paging *hwpt_paging;
ioas = container_of(pt_obj, struct iommufd_ioas, obj);
mutex_lock(&ioas->mutex);
hwpt_paging = iommufd_hwpt_paging_alloc(ucmd->ictx, ioas, idev,
cmd->flags, false);
if (IS_ERR(hwpt_paging)) {
rc = PTR_ERR(hwpt_paging);
goto out_unlock;
}
hwpt = &hwpt_paging->common;
} else {
rc = -EINVAL;
goto out_put_pt;
}
hwpt = &hwpt_paging->common;
cmd->out_hwpt_id = hwpt->obj.id;
rc = iommufd_ucmd_respond(ucmd, sizeof(*cmd));
@ -207,8 +217,10 @@ int iommufd_hwpt_alloc(struct iommufd_ucmd *ucmd)
out_hwpt:
iommufd_object_abort_and_destroy(ucmd->ictx, &hwpt->obj);
out_unlock:
mutex_unlock(&ioas->mutex);
iommufd_put_object(&ioas->obj);
if (ioas)
mutex_unlock(&ioas->mutex);
out_put_pt:
iommufd_put_object(pt_obj);
out_put_idev:
iommufd_put_object(&idev->obj);
return rc;