diff mbox series

[v11,5/7] iommufd: Add iommufd_access_replace() API

Message ID a3267b924fd5f45e0d3a1dd13a9237e923563862.1690523699.git.nicolinc@nvidia.com
State New
Headers
Series Add IO page table replacement support |

Commit Message

Nicolin Chen July 28, 2023, 6:33 a.m. UTC 
  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@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
---
 drivers/iommu/iommufd/device.c | 15 +++++++++++++++
 include/linux/iommufd.h        |  1 +
 2 files changed, 16 insertions(+)

Comments

Jason Gunthorpe July 28, 2023, 12:43 p.m. UTC | #1 
On Thu, Jul 27, 2023 at 11:33:27PM -0700, Nicolin Chen wrote:
> 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@nvidia.com>
> Reviewed-by: Kevin Tian <kevin.tian@intel.com>
> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
> ---
>  drivers/iommu/iommufd/device.c | 15 +++++++++++++++
>  include/linux/iommufd.h        |  1 +
>  2 files changed, 16 insertions(+)

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>

Jason
diff mbox series

Patch

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);