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authorAlexey Kardashevskiy <aik@ozlabs.ru>2017-03-22 07:21:50 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2017-03-30 13:42:11 +0300
commite5afdf9dd515a9446c009f44f99f9bc2f91b89a7 (patch)
tree21683e5afe296b2a6cf32e22f5471b1da1a7a18e /drivers/vfio
parent11edf116e3a6352cfee6b1437d41603c9aff79c9 (diff)
downloadlinux-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.c2
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);
}