linux-kernel - Re: [PATCH v1 4/9] powerpc: Convert to physical address DMA mapping

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Message-ID: <909c5ab3-b3d3-4b5b-bc64-8b30c220ac92@csgroup.eu>
Date: Sat, 4 Oct 2025 08:19:40 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Jason Gunthorpe <jgg@...dia.com>, Leon Romanovsky <leon@...nel.org>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>,
 Leon Romanovsky <leonro@...dia.com>, Andreas Larsson <andreas@...sler.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 "David S. Miller" <davem@...emloft.net>, Geoff Levand <geoff@...radead.org>,
 Helge Deller <deller@....de>, Ingo Molnar <mingo@...hat.com>,
 iommu@...ts.linux.dev,
 "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
 Jason Wang <jasowang@...hat.com>, Juergen Gross <jgross@...e.com>,
 linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org, Madhavan Srinivasan <maddy@...ux.ibm.com>,
 Matt Turner <mattst88@...il.com>, Michael Ellerman <mpe@...erman.id.au>,
 "Michael S. Tsirkin" <mst@...hat.com>,
 Richard Henderson <richard.henderson@...aro.org>,
 sparclinux@...r.kernel.org, Stefano Stabellini <sstabellini@...nel.org>,
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
 Thomas Gleixner <tglx@...utronix.de>, virtualization@...ts.linux.dev,
 x86@...nel.org, xen-devel@...ts.xenproject.org,
 Magnus Lindholm <linmag7@...il.com>
Subject: Re: [PATCH v1 4/9] powerpc: Convert to physical address DMA mapping

Le 03/10/2025 à 18:35, Jason Gunthorpe a écrit :
> On Sun, Sep 28, 2025 at 06:02:24PM +0300, Leon Romanovsky wrote:
>> From: Leon Romanovsky <leonro@...dia.com>
>>
>> Adapt PowerPC DMA to use physical addresses in order to prepare code
>> to removal .map_page and .unmap_page.
>>
>> Signed-off-by: Leon Romanovsky <leonro@...dia.com>
>> ---
>>   arch/powerpc/include/asm/iommu.h         |  8 +++---
>>   arch/powerpc/kernel/dma-iommu.c          | 22 +++++++---------
>>   arch/powerpc/kernel/iommu.c              | 14 +++++-----
>>   arch/powerpc/platforms/ps3/system-bus.c  | 33 ++++++++++++++----------
>>   arch/powerpc/platforms/pseries/ibmebus.c | 15 ++++++-----
>>   arch/powerpc/platforms/pseries/vio.c     | 21 ++++++++-------
>>   6 files changed, 60 insertions(+), 53 deletions(-)
> 
> I think this is good enough for PPC anything more looks quite hard

Can you tell what you have in mind ? What more would be interesting to 
do but looks hard ? Maybe it can be a follow-up change ?

Christophe

> 
> Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
> 
> Jason
>