diff mbox series

[v2,6/6] iommu: Make set_dev_pasid op support domain replacement

Message ID 20240912130427.10119-7-yi.l.liu@intel.com
State New
Headers show
Series Make set_dev_pasid op supporting domain replacement | expand

Commit Message

Yi Liu Sept. 12, 2024, 1:04 p.m. UTC
The iommu core is going to support domain replacement for pasid, it needs
to make the set_dev_pasid op support replacing domain and keep the old
domain config in the failure case.

AMD iommu driver does not support domain replacement for pasid yet, so it
would fail the set_dev_pasid op to keep the old config if the input @old
is non-NULL.

Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
 drivers/iommu/amd/pasid.c | 3 +++
 include/linux/iommu.h     | 3 ++-
 2 files changed, 5 insertions(+), 1 deletion(-)

Comments

Jason Gunthorpe Sept. 26, 2024, 7:06 p.m. UTC | #1
On Thu, Sep 12, 2024 at 06:04:27AM -0700, Yi Liu wrote:
> The iommu core is going to support domain replacement for pasid, it needs
> to make the set_dev_pasid op support replacing domain and keep the old
> domain config in the failure case.
> 
> AMD iommu driver does not support domain replacement for pasid yet, so it
> would fail the set_dev_pasid op to keep the old config if the input @old
> is non-NULL.
> 
> Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Yi Liu <yi.l.liu@intel.com>
> ---
>  drivers/iommu/amd/pasid.c | 3 +++
>  include/linux/iommu.h     | 3 ++-
>  2 files changed, 5 insertions(+), 1 deletion(-)

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

Jason
Tian, Kevin Sept. 30, 2024, 7:20 a.m. UTC | #2
> From: Liu, Yi L <yi.l.liu@intel.com>
> Sent: Thursday, September 12, 2024 9:04 PM
> 
> The iommu core is going to support domain replacement for pasid, it needs
> to make the set_dev_pasid op support replacing domain and keep the old
> domain config in the failure case.
> 
> AMD iommu driver does not support domain replacement for pasid yet, so it
> would fail the set_dev_pasid op to keep the old config if the input @old
> is non-NULL.
> 
> Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Yi Liu <yi.l.liu@intel.com>

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
diff mbox series

Patch

diff --git a/drivers/iommu/amd/pasid.c b/drivers/iommu/amd/pasid.c
index 77bf5f5f947a..30e27bda3fac 100644
--- a/drivers/iommu/amd/pasid.c
+++ b/drivers/iommu/amd/pasid.c
@@ -109,6 +109,9 @@  int iommu_sva_set_dev_pasid(struct iommu_domain *domain,
 	unsigned long flags;
 	int ret = -EINVAL;
 
+	if (old)
+		return -EOPNOTSUPP;
+
 	/* PASID zero is used for requests from the I/O device without PASID */
 	if (!is_pasid_valid(dev_data, pasid))
 		return ret;
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 32dce80aa7fd..27f923450a7c 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -616,7 +616,8 @@  struct iommu_ops {
  * * EBUSY	- device is attached to a domain and cannot be changed
  * * ENODEV	- device specific errors, not able to be attached
  * * <others>	- treated as ENODEV by the caller. Use is discouraged
- * @set_dev_pasid: set an iommu domain to a pasid of device
+ * @set_dev_pasid: set or replace an iommu domain to a pasid of device. The pasid of
+ *                 the device should be left in the old config in error case.
  * @map_pages: map a physically contiguous set of pages of the same size to
  *             an iommu domain.
  * @unmap_pages: unmap a number of pages of the same size from an iommu domain