The sw_msi_start is only set by the ARM drivers and it is always constant.
Due to the way vfio/iommufd allow domains to be re-used between
devices we have a built in assumption that there is only one value
for sw_msi_start and it is global to the system.
To make replace simpler where we may not reparse the
iommu_get_resv_regions() move the sw_msi_start to the iommufd_group so it
is always available once any HWPT has been attached.
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
---
drivers/iommu/iommufd/device.c | 14 +++++++-------
drivers/iommu/iommufd/iommufd_private.h | 1 +
2 files changed, 8 insertions(+), 7 deletions(-)
diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c
index 7f063b679a24be..616a23939e968b 100644
--- a/drivers/iommu/iommufd/device.c
+++ b/drivers/iommu/iommufd/device.c
@@ -88,6 +88,7 @@ static struct iommufd_group *iommufd_get_group(struct iommufd_ctx *ictx,
kref_init(&new_igroup->ref);
mutex_init(&new_igroup->lock);
INIT_LIST_HEAD(&new_igroup->device_list);
+ new_igroup->sw_msi_start = PHYS_ADDR_MAX;
/* group reference moves into new_igroup */
new_igroup->group = group;
@@ -249,10 +250,10 @@ void iommufd_device_unbind(struct iommufd_device *idev)
}
EXPORT_SYMBOL_NS_GPL(iommufd_device_unbind, IOMMUFD);
-static int iommufd_device_setup_msi(struct iommufd_device *idev,
- struct iommufd_hw_pagetable *hwpt,
- phys_addr_t sw_msi_start)
+static int iommufd_group_setup_msi(struct iommufd_group *igroup,
+ struct iommufd_hw_pagetable *hwpt)
{
+ phys_addr_t sw_msi_start = igroup->sw_msi_start;
int rc;
/*
@@ -285,7 +286,6 @@ static int iommufd_device_setup_msi(struct iommufd_device *idev,
int iommufd_hw_pagetable_attach(struct iommufd_hw_pagetable *hwpt,
struct iommufd_device *idev)
{
- phys_addr_t sw_msi_start = PHYS_ADDR_MAX;
int rc;
lockdep_assert_held(&idev->igroup->lock);
@@ -310,8 +310,8 @@ int iommufd_hw_pagetable_attach(struct iommufd_hw_pagetable *hwpt,
}
}
- rc = iopt_table_enforce_dev_resv_regions(
- &hwpt->ioas->iopt, idev->dev, &sw_msi_start);
+ rc = iopt_table_enforce_dev_resv_regions(&hwpt->ioas->iopt, idev->dev,
+ &idev->igroup->sw_msi_start);
if (rc)
return rc;
@@ -322,7 +322,7 @@ int iommufd_hw_pagetable_attach(struct iommufd_hw_pagetable *hwpt,
* regions are only updated during individual device attachment.
*/
if (list_empty(&idev->igroup->device_list)) {
- rc = iommufd_device_setup_msi(idev, hwpt, sw_msi_start);
+ rc = iommufd_group_setup_msi(idev->igroup, hwpt);
if (rc)
goto err_unresv;
diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h
index 22863759c3bfb0..7f4936cf537be4 100644
--- a/drivers/iommu/iommufd/iommufd_private.h
+++ b/drivers/iommu/iommufd/iommufd_private.h
@@ -267,6 +267,7 @@ struct iommufd_group {
struct iommu_group *group;
struct iommufd_hw_pagetable *hwpt;
struct list_head device_list;
+ phys_addr_t sw_msi_start;
};
/*
--
2.40.0
