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vfio: powerpc/spapr: Rework groups attaching

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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>
This commit is contained in:
Alexey Kardashevskiy 2015-06-05 16:35:04 +10:00 committed by Michael Ellerman
parent 649354b75d
commit 22af48596e
1 changed files with 25 additions and 17 deletions
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42
drivers/vfio/vfio_iommu_spapr_tce.c
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@ -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);
}
/* 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);
goto unlock_exit;
}
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);
}