From: Leonardo Bras <leobras.c@gmail.com>
To: Alexey Kardashevskiy <aik@ozlabs.ru>,
Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Christophe Leroy <christophe.leroy@c-s.fr>,
Joel Stanley <joel@jms.id.au>,
Thiago Jung Bauermann <bauerman@linux.ibm.com>,
Ram Pai <linuxram@us.ibm.com>,
Brian King <brking@linux.vnet.ibm.com>,
Murilo Fossa Vicentini <muvic@linux.ibm.com>,
David Dai <zdai@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1 05/10] powerpc/pseries/iommu: Add iommu_pseries_alloc_table() helper
Date: Thu, 27 Aug 2020 18:23:59 -0300 [thread overview]
Message-ID: <e06630576e199db4e93d64b55e565eff8456a2e4.camel@gmail.com> (raw)
In-Reply-To: <e4ea6264-578d-f8ea-a0c4-3b279b5c0411@ozlabs.ru>
On Mon, 2020-08-24 at 10:38 +1000, Alexey Kardashevskiy wrote:
>
> On 18/08/2020 09:40, Leonardo Bras wrote:
> > Creates a helper to allow allocating a new iommu_table without the need
> > to reallocate the iommu_group.
> >
> > This will be helpful for replacing the iommu_table for the new DMA window,
> > after we remove the old one with iommu_tce_table_put().
> >
> > Signed-off-by: Leonardo Bras <leobras.c@gmail.com>
> > ---
> > arch/powerpc/platforms/pseries/iommu.c | 25 ++++++++++++++-----------
> > 1 file changed, 14 insertions(+), 11 deletions(-)
> >
> > diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
> > index 8fe23b7dff3a..39617ce0ec83 100644
> > --- a/arch/powerpc/platforms/pseries/iommu.c
> > +++ b/arch/powerpc/platforms/pseries/iommu.c
> > @@ -53,28 +53,31 @@ enum {
> > DDW_EXT_QUERY_OUT_SIZE = 2
> > };
> >
> > -static struct iommu_table_group *iommu_pseries_alloc_group(int node)
> > +static struct iommu_table *iommu_pseries_alloc_table(int node)
> > {
> > - struct iommu_table_group *table_group;
> > struct iommu_table *tbl;
> >
> > - table_group = kzalloc_node(sizeof(struct iommu_table_group), GFP_KERNEL,
> > - node);
> > - if (!table_group)
> > - return NULL;
> > -
> > tbl = kzalloc_node(sizeof(struct iommu_table), GFP_KERNEL, node);
> > if (!tbl)
> > - goto free_group;
> > + return NULL;
> >
> > INIT_LIST_HEAD_RCU(&tbl->it_group_list);
> > kref_init(&tbl->it_kref);
> > + return tbl;
> > +}
> >
> > - table_group->tables[0] = tbl;
> > +static struct iommu_table_group *iommu_pseries_alloc_group(int node)
> > +{
> > + struct iommu_table_group *table_group;
> > +
> > + table_group = kzalloc_node(sizeof(*table_group), GFP_KERNEL, node);
>
> I'd prefer you did not make unrelated changes (sizeof(struct
> iommu_table_group) -> sizeof(*table_group)) so the diff stays shorter
> and easier to follow. You changed sizeof(struct iommu_table_group) but
> not sizeof(struct iommu_table) and this confused me enough to spend more
> time than this straight forward change deserves.
Sorry, I will keep this in mind for future patches.
Thank you for the tip!
>
> Not important in this case though so
>
> Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Thank you!
next prev parent reply other threads:[~2020-08-27 21:24 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-17 23:40 [PATCH v1 00/10] DDW indirect mapping Leonardo Bras
2020-08-17 23:40 ` [PATCH v1 01/10] powerpc/pseries/iommu: Replace hard-coded page shift Leonardo Bras
2020-08-22 9:33 ` Alexey Kardashevskiy
2020-08-27 15:32 ` Leonardo Bras
2020-08-28 2:27 ` Alexey Kardashevskiy
2020-08-28 19:55 ` Leonardo Bras
2020-08-31 0:06 ` Alexey Kardashevskiy
2020-08-31 1:41 ` Oliver O'Halloran
2020-08-31 3:48 ` Alexey Kardashevskiy
2020-09-01 21:38 ` Leonardo Bras
2020-09-03 4:26 ` Alexey Kardashevskiy
2020-08-17 23:40 ` [PATCH v1 02/10] powerpc/kernel/iommu: Align size for IOMMU_PAGE_SIZE on iommu_*_coherent() Leonardo Bras
2020-08-22 10:07 ` Alexey Kardashevskiy
2020-08-27 16:51 ` Leonardo Bras
2020-08-28 1:40 ` Alexey Kardashevskiy
2020-08-28 20:41 ` Leonardo Bras
2020-08-31 0:47 ` Alexey Kardashevskiy
2020-09-01 22:34 ` Leonardo Bras
2020-09-03 4:41 ` Alexey Kardashevskiy
2020-09-04 6:04 ` Leonardo Bras
2020-09-08 3:18 ` Alexey Kardashevskiy
2020-08-17 23:40 ` [PATCH v1 03/10] powerpc/kernel/iommu: Use largepool as a last resort when !largealloc Leonardo Bras
2020-08-22 10:09 ` Alexey Kardashevskiy
2020-08-27 16:58 ` Leonardo Bras
2020-08-17 23:40 ` [PATCH v1 04/10] powerpc/kernel/iommu: Add new iommu_table_in_use() helper Leonardo Bras
2020-08-22 10:34 ` Alexey Kardashevskiy
2020-08-27 18:34 ` Leonardo Bras
2020-08-28 1:51 ` Alexey Kardashevskiy
2020-08-17 23:40 ` [PATCH v1 05/10] powerpc/pseries/iommu: Add iommu_pseries_alloc_table() helper Leonardo Bras
2020-08-24 0:38 ` Alexey Kardashevskiy
2020-08-27 21:23 ` Leonardo Bras [this message]
2020-08-17 23:40 ` [PATCH v1 06/10] powerpc/pseries/iommu: Add ddw_list_add() helper Leonardo Bras
2020-08-24 3:46 ` Alexey Kardashevskiy
2020-08-27 22:11 ` Leonardo Bras
2020-08-28 1:58 ` Alexey Kardashevskiy
2020-08-28 21:28 ` Leonardo Bras
2020-08-17 23:40 ` [PATCH v1 07/10] powerpc/pseries/iommu: Allow DDW windows starting at 0x00 Leonardo Bras
2020-08-24 3:44 ` Alexey Kardashevskiy
2020-08-28 14:04 ` Leonardo Bras
2020-08-31 0:50 ` Alexey Kardashevskiy
2020-08-17 23:40 ` [PATCH v1 08/10] powerpc/pseries/iommu: Add ddw_property_create() and refactor enable_ddw() Leonardo Bras
2020-08-24 5:07 ` Alexey Kardashevskiy
2020-08-28 15:25 ` Leonardo Bras
2020-08-31 4:34 ` Alexey Kardashevskiy
2020-09-02 5:27 ` Leonardo Bras
2020-08-17 23:40 ` [PATCH v1 09/10] powerpc/pseries/iommu: Make use of DDW even if it does not map the partition Leonardo Bras
2020-08-24 5:17 ` Alexey Kardashevskiy
2020-08-28 18:36 ` Leonardo Bras
2020-08-31 4:35 ` Alexey Kardashevskiy
2020-09-02 6:11 ` Leonardo Bras
2020-09-04 1:00 ` Alexey Kardashevskiy
2020-08-17 23:40 ` [PATCH v1 10/10] powerpc/pseries/iommu: Rename "direct window" to "dma window" Leonardo Bras
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