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| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2017-03-22 07:21:50 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-03-30 13:42:11 +0300 |
| commit | e5afdf9dd515a9446c009f44f99f9bc2f91b89a7 (patch) | |
| tree | 21683e5afe296b2a6cf32e22f5471b1da1a7a18e /drivers/vfio | |
| parent | 11edf116e3a6352cfee6b1437d41603c9aff79c9 (diff) | |
| download | linux-e5afdf9dd515a9446c009f44f99f9bc2f91b89a7.tar.xz | |
powerpc/vfio_spapr_tce: Add reference counting to iommu_table
So far iommu_table obejcts were only used in virtual mode and had
a single owner. We are going to change this by implementing in-kernel
acceleration of DMA mapping requests. The proposed acceleration
will handle requests in real mode and KVM will keep references to tables.
This adds a kref to iommu_table and defines new helpers to update it.
This replaces iommu_free_table() with iommu_tce_table_put() and makes
iommu_free_table() static. iommu_tce_table_get() is not used in this patch
but it will be in the following patch.
Since this touches prototypes, this also removes @node_name parameter as
it has never been really useful on powernv and carrying it for
the pseries platform code to iommu_free_table() seems to be quite
useless as well.
This should cause no behavioral change.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/vfio')
| -rw-r--r-- | drivers/vfio/vfio_iommu_spapr_tce.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c index fbec7348a7e5..8031d3a55a17 100644 --- a/drivers/vfio/vfio_iommu_spapr_tce.c +++ b/drivers/vfio/vfio_iommu_spapr_tce.c @@ -680,7 +680,7 @@ static void tce_iommu_free_table(struct tce_container *container, unsigned long pages = tbl->it_allocated_size >> PAGE_SHIFT; tce_iommu_userspace_view_free(tbl, container->mm); - iommu_free_table(tbl, ""); + iommu_tce_table_put(tbl); decrement_locked_vm(container->mm, pages); } |