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

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Message-ID: <20150429024959.GI32589@voom.redhat.com>
Date:	Wed, 29 Apr 2015 12:49:59 +1000
From:	David Gibson <david@...son.dropbear.id.au>
To:	Alexey Kardashevskiy <aik@...abs.ru>
Cc:	linuxppc-dev@...ts.ozlabs.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	Gavin Shan <gwshan@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH kernel v9 12/32] powerpc/spapr: vfio: Switch from
 iommu_table to new iommu_table_group

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 .
> iommu_reset_table().
> 
> 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@...abs.ru>
> [aw: for the vfio related changes]
> Acked-by: Alex Williamson <alex.williamson@...hat.com>

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

Reviewed-by: David Gibson <david@...son.dropbear.id.au>

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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