Taking advantage of the new iommufd_access_change_ioas_id helper, add an
iommufd_access_replace() API for VFIO emulated pathway to use.
Suggested-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
---
drivers/iommu/iommufd/device.c | 15 +++++++++++++++
include/linux/iommufd.h | 1 +
2 files changed, 16 insertions(+)
diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c
index c0b9cd97ec58..4c37eeea2bcd 100644
--- a/drivers/iommu/iommufd/device.c
+++ b/drivers/iommu/iommufd/device.c
@@ -849,6 +849,21 @@ int iommufd_access_attach(struct iommufd_access *access, u32 ioas_id)
}
EXPORT_SYMBOL_NS_GPL(iommufd_access_attach, IOMMUFD);
+int iommufd_access_replace(struct iommufd_access *access, u32 ioas_id)
+{
+ int rc;
+
+ mutex_lock(&access->ioas_lock);
+ if (!access->ioas) {
+ mutex_unlock(&access->ioas_lock);
+ return -ENOENT;
+ }
+ rc = iommufd_access_change_ioas_id(access, ioas_id);
+ mutex_unlock(&access->ioas_lock);
+ return rc;
+}
+EXPORT_SYMBOL_NS_GPL(iommufd_access_replace, IOMMUFD);
+
/**
* iommufd_access_notify_unmap - Notify users of an iopt to stop using it
* @iopt: iopt to work on
diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h
index 0ac60256b659..ffc3a949f837 100644
--- a/include/linux/iommufd.h
+++ b/include/linux/iommufd.h
@@ -49,6 +49,7 @@ iommufd_access_create(struct iommufd_ctx *ictx,
const struct iommufd_access_ops *ops, void *data, u32 *id);
void iommufd_access_destroy(struct iommufd_access *access);
int iommufd_access_attach(struct iommufd_access *access, u32 ioas_id);
+int iommufd_access_replace(struct iommufd_access *access, u32 ioas_id);
void iommufd_access_detach(struct iommufd_access *access);
void iommufd_ctx_get(struct iommufd_ctx *ictx);
--
2.41.0
