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| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2019-02-11 10:49:17 +0300 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2019-02-13 23:08:12 +0300 |
| commit | a3906855890d94736d240f0f637585c1470d8d02 (patch) | |
| tree | 9b652b78d7482ef03b8d5a770190157ae02d933b /drivers/vfio/vfio_iommu_spapr_tce.c | |
| parent | 3e4835f7d7a84ab022682aaeecaae5c508aeb76c (diff) | |
| download | linux-a3906855890d94736d240f0f637585c1470d8d02.tar.xz | |
vfio/spapr_tce: Skip unsetting already unset table
VFIO TCE IOMMU v2 owns IOMMU tables. When we detach an IOMMU group from
a container, we need to unset these tables from the group which we do by
calling unset_window(). We also unset tables when removing a DMA window
via the VFIO_IOMMU_SPAPR_TCE_REMOVE ioctl.
The window removal checks if the table actually exists (hidden inside
tce_iommu_find_table()) but the group detaching does not so the user
may see duplicating messages:
pci 0009:03 : [PE# fd] Removing DMA window #0
pci 0009:03 : [PE# fd] Removing DMA window #1
pci 0009:03 : [PE# fd] Removing DMA window #0
pci 0009:03 : [PE# fd] Removing DMA window #1
At the moment this is not a problem as the second invocation
of unset_window() writes zeroes to the HW registers again and exits early
as there is no table.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio/vfio_iommu_spapr_tce.c')
| -rw-r--r-- | drivers/vfio/vfio_iommu_spapr_tce.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c index c424913324e3..8dbb270998f4 100644 --- a/drivers/vfio/vfio_iommu_spapr_tce.c +++ b/drivers/vfio/vfio_iommu_spapr_tce.c @@ -1235,7 +1235,8 @@ static void tce_iommu_release_ownership_ddw(struct tce_container *container, } for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) - table_group->ops->unset_window(table_group, i); + if (container->tables[i]) + table_group->ops->unset_window(table_group, i); table_group->ops->release_ownership(table_group); } |