iommu: Add attach handle to struct iopf_group

Previously, the domain that a page fault targets is stored in an
iopf_group, which represents a minimal set of page faults. With the
introduction of attach handle, replace the domain with the handle
so that the fault handler can obtain more information as needed
when handling the faults.

iommu_report_device_fault() is currently used for SVA page faults,
which handles the page fault in an internal cycle. The domain is retrieved
with iommu_get_domain_for_dev_pasid() if the pasid in the fault message
is valid. This doesn't work in IOMMUFD case, where if the pasid table of
a device is wholly managed by user space, there is no domain attached to
the PASID of the device, and all page faults are forwarded through a
NESTING domain attaching to RID.

Add a static flag in iommu ops, which indicates if the IOMMU driver
supports user-managed PASID tables. In the iopf deliver path, if no
attach handle found for the iopf PASID, roll back to RID domain when
the IOMMU driver supports this capability.

iommu_get_domain_for_dev_pasid() is no longer used and can be removed.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20240702063444.105814-4-baolu.lu@linux.intel.com
Signed-off-by: Will Deacon <will@kernel.org>

1 files changed, 0 insertions, 39 deletions

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 7890bd21dff6..5a7e874abb36 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -3421,45 +3421,6 @@ void iommu_detach_device_pasid(struct iommu_domain *domain, struct device *dev,
 }
 EXPORT_SYMBOL_GPL(iommu_detach_device_pasid);
 
-/*
- * iommu_get_domain_for_dev_pasid() - Retrieve domain for @pasid of @dev
- * @dev: the queried device
- * @pasid: the pasid of the device
- * @type: matched domain type, 0 for any match
- *
- * This is a variant of iommu_get_domain_for_dev(). It returns the existing
- * domain attached to pasid of a device. Callers must hold a lock around this
- * function, and both iommu_attach/detach_dev_pasid() whenever a domain of
- * type is being manipulated. This API does not internally resolve races with
- * attach/detach.
- *
- * Return: attached domain on success, NULL otherwise.
- */
-struct iommu_domain *iommu_get_domain_for_dev_pasid(struct device *dev,
-						    ioasid_t pasid,
-						    unsigned int type)
-{
-	/* Caller must be a probed driver on dev */
-	struct iommu_group *group = dev->iommu_group;
-	struct iommu_attach_handle *handle;
-	struct iommu_domain *domain = NULL;
-
-	if (!group)
-		return NULL;
-
-	xa_lock(&group->pasid_array);
-	handle = xa_load(&group->pasid_array, pasid);
-	if (handle)
-		domain = handle->domain;
-
-	if (type && domain && domain->type != type)
-		domain = NULL;
-	xa_unlock(&group->pasid_array);
-
-	return domain;
-}
-EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev_pasid);
-
 ioasid_t iommu_alloc_global_pasid(struct device *dev)
 {
 	int ret;