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Message-ID: <75cde75987bf4a73ec34335e1c13efda93791989.1728491532.git.nicolinc@nvidia.com>
Date: Wed, 9 Oct 2024 09:38:19 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <jgg@...dia.com>, <kevin.tian@...el.com>, <will@...nel.org>
CC: <joro@...tes.org>, <suravee.suthikulpanit@....com>,
<robin.murphy@....com>, <dwmw2@...radead.org>, <baolu.lu@...ux.intel.com>,
<shuah@...nel.org>, <linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
<linux-arm-kernel@...ts.infradead.org>, <linux-kselftest@...r.kernel.org>,
<eric.auger@...hat.com>, <jean-philippe@...aro.org>, <mdf@...nel.org>,
<mshavit@...gle.com>, <shameerali.kolothum.thodi@...wei.com>,
<smostafa@...gle.com>, <yi.l.liu@...el.com>, <aik@....com>,
<patches@...ts.linux.dev>
Subject: [PATCH v3 07/16] iommufd: Allow hwpt_id to carry viommu_id for IOMMU_HWPT_INVALIDATE
With a vIOMMU object, use space can flush any IOMMU related cache that can
be directed using the vIOMMU object. It is similar to IOMMU_HWPT_INVALIDATE
uAPI, but can cover a wider range than IOTLB, e.g. device/desciprtor cache.
Allow hwpt_id of the iommu_hwpt_invalidate structure to carry a viommu_id,
and reuse the IOMMU_HWPT_INVALIDATE uAPI for vIOMMU invalidations. Drivers
can define different structures for vIOMMU invalidations v.s. HWPT ones.
Update the uAPI, kdoc, and selftest case accordingly.
Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
include/uapi/linux/iommufd.h | 9 ++++---
drivers/iommu/iommufd/hw_pagetable.c | 32 +++++++++++++++++++------
tools/testing/selftests/iommu/iommufd.c | 4 ++--
3 files changed, 33 insertions(+), 12 deletions(-)
diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h
index 3039519d71b7..cd9e135ef563 100644
--- a/include/uapi/linux/iommufd.h
+++ b/include/uapi/linux/iommufd.h
@@ -728,7 +728,7 @@ struct iommu_hwpt_vtd_s1_invalidate {
/**
* struct iommu_hwpt_invalidate - ioctl(IOMMU_HWPT_INVALIDATE)
* @size: sizeof(struct iommu_hwpt_invalidate)
- * @hwpt_id: ID of a nested HWPT for cache invalidation
+ * @hwpt_id: ID of a nested HWPT or a vIOMMU, for cache invalidation
* @data_uptr: User pointer to an array of driver-specific cache invalidation
* data.
* @data_type: One of enum iommu_hwpt_invalidate_data_type, defining the data
@@ -739,8 +739,11 @@ struct iommu_hwpt_vtd_s1_invalidate {
* Output the number of requests successfully handled by kernel.
* @__reserved: Must be 0.
*
- * Invalidate the iommu cache for user-managed page table. Modifications on a
- * user-managed page table should be followed by this operation to sync cache.
+ * Invalidate iommu cache for user-managed page table or vIOMMU. Modifications
+ * on a user-managed page table should be followed by this operation, if a HWPT
+ * is passed in via @hwpt_id. Other caches, such as device cache or descriptor
+ * cache can be flushed if a vIOMMU is passed in via the @hwpt_id field.
+ *
* Each ioctl can support one or more cache invalidation requests in the array
* that has a total size of @entry_len * @entry_num.
*
diff --git a/drivers/iommu/iommufd/hw_pagetable.c b/drivers/iommu/iommufd/hw_pagetable.c
index ccaaf801955c..211b3f8b4366 100644
--- a/drivers/iommu/iommufd/hw_pagetable.c
+++ b/drivers/iommu/iommufd/hw_pagetable.c
@@ -444,7 +444,7 @@ int iommufd_hwpt_invalidate(struct iommufd_ucmd *ucmd)
.entry_len = cmd->entry_len,
.entry_num = cmd->entry_num,
};
- struct iommufd_hw_pagetable *hwpt;
+ struct iommufd_object *pt_obj;
u32 done_num = 0;
int rc;
@@ -458,17 +458,35 @@ int iommufd_hwpt_invalidate(struct iommufd_ucmd *ucmd)
goto out;
}
- hwpt = iommufd_get_hwpt_nested(ucmd, cmd->hwpt_id);
- if (IS_ERR(hwpt)) {
- rc = PTR_ERR(hwpt);
+ pt_obj = iommufd_get_object(ucmd->ictx, cmd->hwpt_id, IOMMUFD_OBJ_ANY);
+ if (IS_ERR(pt_obj)) {
+ rc = PTR_ERR(pt_obj);
goto out;
}
+ if (pt_obj->type == IOMMUFD_OBJ_HWPT_NESTED) {
+ struct iommufd_hw_pagetable *hwpt =
+ container_of(pt_obj, struct iommufd_hw_pagetable, obj);
+
+ rc = hwpt->domain->ops->cache_invalidate_user(hwpt->domain,
+ &data_array);
+ } else if (pt_obj->type == IOMMUFD_OBJ_VIOMMU) {
+ struct iommufd_viommu *viommu =
+ container_of(pt_obj, struct iommufd_viommu, obj);
+
+ if (!viommu->ops || !viommu->ops->cache_invalidate) {
+ rc = -EOPNOTSUPP;
+ goto out_put_pt;
+ }
+ rc = viommu->ops->cache_invalidate(viommu, &data_array);
+ } else {
+ rc = -EINVAL;
+ goto out_put_pt;
+ }
- rc = hwpt->domain->ops->cache_invalidate_user(hwpt->domain,
- &data_array);
done_num = data_array.entry_num;
- iommufd_put_object(ucmd->ictx, &hwpt->obj);
+out_put_pt:
+ iommufd_put_object(ucmd->ictx, pt_obj);
out:
cmd->entry_num = done_num;
if (iommufd_ucmd_respond(ucmd, sizeof(*cmd)))
diff --git a/tools/testing/selftests/iommu/iommufd.c b/tools/testing/selftests/iommu/iommufd.c
index af00b082656e..2651e2b58423 100644
--- a/tools/testing/selftests/iommu/iommufd.c
+++ b/tools/testing/selftests/iommu/iommufd.c
@@ -362,9 +362,9 @@ TEST_F(iommufd_ioas, alloc_hwpt_nested)
EXPECT_ERRNO(EBUSY,
_test_ioctl_destroy(self->fd, parent_hwpt_id));
- /* hwpt_invalidate only supports a user-managed hwpt (nested) */
+ /* hwpt_invalidate does not support a parent hwpt */
num_inv = 1;
- test_err_hwpt_invalidate(ENOENT, parent_hwpt_id, inv_reqs,
+ test_err_hwpt_invalidate(EINVAL, parent_hwpt_id, inv_reqs,
IOMMU_HWPT_INVALIDATE_DATA_SELFTEST,
sizeof(*inv_reqs), &num_inv);
assert(!num_inv);
--
2.43.0
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