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From: Ram Pai <linuxram@us.ibm.com>
To: Leonardo Bras <leonardo@linux.ibm.com>
Cc: andmike@us.ibm.com, mst@redhat.com, aik@ozlabs.ru,
	mdroth@linux.vnet.ibm.com, linux-kernel@vger.kernel.org,
	ram.n.pai@gmail.com, cai@lca.pw, tglx@linutronix.de,
	sukadev@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org,
	hch@lst.de, bauerman@linux.ibm.com, david@gibson.dropbear.id.au
Subject: Re: [PATCH v4 1/2] powerpc/pseries/iommu: Share the per-cpu TCE page with the hypervisor.
Date: Wed, 4 Dec 2019 12:27:51 -0800
Message-ID: <20191204202751.GD5063@oc0525413822.ibm.com> (raw)
In-Reply-To: <1f337af9f52ac4c3128e61c971cf0e32068a71ab.camel@linux.ibm.com>

On Wed, Dec 04, 2019 at 03:26:50PM -0300, Leonardo Bras wrote:
> On Sun, 2019-12-01 at 22:45 -0800, Ram Pai wrote:
> > @@ -206,8 +224,7 @@ static int tce_buildmulti_pSeriesLP(struct iommu_table *tbl, long tcenum,
> >          * from iommu_alloc{,_sg}()
> >          */
> >         if (!tcep) {
> > -               tcep = (__be64 *)__get_free_page(GFP_ATOMIC);
> > -               /* If allocation fails, fall back to the loop implementation */
> > +               tcep = alloc_tce_page();
> >                 if (!tcep) {
> >                         local_irq_restore(flags);
> >                         return tce_build_pSeriesLP(tbl, tcenum, npages, uaddr,
> 
> The comment about failing allocation was removed, but I see no chage of
> behaviour here. 
> 
> Can you please explain what/where it changes? 

You observed it right. The comment should stay put.  Will have it fixed
in my next version.

Thanks,
RP


      reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-02  6:45 [PATCH v4 0/2] Enable IOMMU support for pseries Secure VMs Ram Pai
2019-12-02  6:45 ` [PATCH v4 1/2] powerpc/pseries/iommu: Share the per-cpu TCE page with the hypervisor Ram Pai
2019-12-02  6:45   ` [PATCH v4 2/2] powerpc/pseries/iommu: Use dma_iommu_ops for Secure VMs aswell Ram Pai
2019-12-03  0:58     ` Alexey Kardashevskiy
2019-12-03  4:07       ` Ram Pai
2019-12-03  0:56   ` [PATCH v4 1/2] powerpc/pseries/iommu: Share the per-cpu TCE page with the hypervisor Alexey Kardashevskiy
2019-12-03  2:08     ` Ram Pai
2019-12-03  2:15       ` Alexey Kardashevskiy
2019-12-03  4:05         ` Ram Pai
2019-12-03  4:24           ` Alexey Kardashevskiy
2019-12-03 16:52             ` Ram Pai
2019-12-04  0:04               ` Alexey Kardashevskiy
2019-12-04  0:49                 ` Ram Pai
     [not found]                   ` <5963ff32-2119-be7c-d1e5-63457888a73b@ozlabs.ru>
2019-12-04  3:36                     ` David Gibson
2019-12-04 20:42                       ` Ram Pai
2019-12-04 22:26                         ` Alexey Kardashevskiy
2019-12-05  2:15                           ` [PATCH v4 1/2] powerpc/pseries/iommu: Share the per-cpu TCE page with the hypervisor.y Ram Pai
2019-12-06 23:10                           ` [PATCH v4 1/2] powerpc/pseries/iommu: Share the per-cpu TCE page with the hypervisor Ram Pai
2019-12-05  8:28                         ` Christoph Hellwig
2019-12-04 18:26   ` Leonardo Bras
2019-12-04 20:27     ` Ram Pai [this message]

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