Re: [PATCH kernel v9 12/32] powerpc/spapr: vfio: Switch from iommu_table to new iommu_table_group

From: Alexey Kardashevskiy
Date: Wed Apr 29 2015 - 22:31:00 EST

On 04/29/2015 12:49 PM, David Gibson wrote:
On Sat, Apr 25, 2015 at 10:14:36PM +1000, Alexey Kardashevskiy wrote:
Modern IBM POWERPC systems support multiple (currently two) TCE tables
per IOMMU group (a.k.a. PE). This adds a iommu_table_group container
for TCE tables. Right now just one table is supported.

For P5IOC2 and IODA, iommu_table_group is embedded into PE struct
(pnv_ioda_pe and pnv_phb) and does not require iommu_free_table(), only .

For pSeries, this replaces multiple calls of kzalloc_node() with a new
iommu_pseries_group_alloc() helper and stores the table group struct
pointer into the pci_dn struct. For release, a iommu_table_group_free()
helper is added.

This should cause no behavioural change.

Signed-off-by: Alexey Kardashevskiy <aik@xxxxxxxxx>
[aw: for the vfio related changes]
Acked-by: Alex Williamson <alex.williamson@xxxxxxxxxx>

I'm not particularly fond of the "table_group" name, but I can't
really think of a better name for now. So,

I asked Ben again. iommu_state is not much better either. I'd stick to iommu_table_group.

Reviewed-by: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>

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