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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org > -----Original Message----- > From: Frank Li > Sent: Thursday, July 15, 2021 10:54 AM > To: Will Deacon > Cc: Catalin Marinas ; Zhi Li ; > Shenwei Wang ; Han Xu ; Nitin Garg > ; Jason Liu ; linux-arm- > kernel@lists.infradead.org > Subject: RE: [EXT] Re: The problem about arm64: io: Relax implicit barriers > in default I/O accessors > > > > > -----Original Message----- > > From: Will Deacon > > Sent: Tuesday, July 6, 2021 12:11 PM > > To: Frank Li > > Cc: Catalin Marinas ; Zhi Li ; > > Shenwei Wang ; Han Xu ; Nitin Garg > > ; Jason Liu ; linux-arm- > > kernel@lists.infradead.org > > Subject: Re: [EXT] Re: The problem about arm64: io: Relax implicit > barriers > > in default I/O accessors > > > > Caution: EXT Email > > > > Hi Frank, > > > > On Wed, Jun 23, 2021 at 03:48:10PM +0000, Frank Li wrote: > > > > I think you had a support case open with Arm [1] which I'm not able > to > > > > access -- please can you ask them about the two examples above? > > > > > > Still not get feedback from ARM. > > > > Just wondering if you were able to solve this without the need to change > > Linux? > > Sorry for late reply > > For CCI-500 and 550, ARM removed support for barrier transactions but CCI- > 400 supports barrier transactions. With CCI-400 it is a valid configuration > to have SYSBARDISABLE LOW in Cortex-A processors. This change in Linux > kernel is assuming that the SYSBARDISABLE is set to HIGH hence its not > correct change for all products having various versions of ARM CCI IP. > > Frank Li Deacon: Did you plan fix this problem by changing dma_wmb()? Frank Li > > > > > Cheers, > > > > Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel