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authorAlexey Kardashevskiy <aik@ozlabs.ru>2015-06-05 16:35:04 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2015-06-11 15:14:56 +1000
commit22af48596e9c92313d475306b684f844301ea4cd (patch)
treec8ca7bdf5d382b69616545a53158a4ba0ea92ad0 /drivers/vfio
parent649354b75dca1ebcb55d8db41e1d6b59ef69ac77 (diff)
downloadlinux-22af48596e9c92313d475306b684f844301ea4cd.tar.bz2
vfio: powerpc/spapr: Rework groups attaching
This is to make extended ownership and multiple groups support patches simpler for review. This should cause no behavioural change. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> [aw: for the vfio related changes] Acked-by: Alex Williamson <alex.williamson@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/vfio_iommu_spapr_tce.c40
1 files changed, 24 insertions, 16 deletions
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
index cf5d4a159ce9..e65bc73cc8a8 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -460,16 +460,21 @@ static int tce_iommu_attach_group(void *iommu_data,
iommu_group_id(container->tbl->it_group),
iommu_group_id(iommu_group));
ret = -EBUSY;
- } else if (container->enabled) {
+ goto unlock_exit;
+ }
+
+ if (container->enabled) {
pr_err("tce_vfio: attaching group #%u to enabled container\n",
iommu_group_id(iommu_group));
ret = -EBUSY;
- } else {
- ret = iommu_take_ownership(tbl);
- if (!ret)
- container->tbl = tbl;
+ goto unlock_exit;
}
+ ret = iommu_take_ownership(tbl);
+ if (!ret)
+ container->tbl = tbl;
+
+unlock_exit:
mutex_unlock(&container->lock);
return ret;
@@ -487,19 +492,22 @@ static void tce_iommu_detach_group(void *iommu_data,
pr_warn("tce_vfio: detaching group #%u, expected group is #%u\n",
iommu_group_id(iommu_group),
iommu_group_id(tbl->it_group));
- } else {
- if (container->enabled) {
- pr_warn("tce_vfio: detaching group #%u from enabled container, forcing disable\n",
- iommu_group_id(tbl->it_group));
- tce_iommu_disable(container);
- }
+ goto unlock_exit;
+ }
- /* pr_debug("tce_vfio: detaching group #%u from iommu %p\n",
- iommu_group_id(iommu_group), iommu_group); */
- container->tbl = NULL;
- tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
- iommu_release_ownership(tbl);
+ if (container->enabled) {
+ pr_warn("tce_vfio: detaching group #%u from enabled container, forcing disable\n",
+ iommu_group_id(tbl->it_group));
+ tce_iommu_disable(container);
}
+
+ /* pr_debug("tce_vfio: detaching group #%u from iommu %p\n",
+ iommu_group_id(iommu_group), iommu_group); */
+ container->tbl = NULL;
+ tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
+ iommu_release_ownership(tbl);
+
+unlock_exit:
mutex_unlock(&container->lock);
}