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From: Frank Li <frank.li@nxp.com>
To: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Zhi Li <lznuaa@gmail.com>, Shenwei Wang <shenwei.wang@nxp.com>,
	Han Xu <han.xu@nxp.com>, Nitin Garg <nitin.garg@nxp.com>,
	Jason Liu <jason.hui.liu@nxp.com>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>
Subject: RE: [EXT] Re: The problem about arm64: io: Relax implicit barriers in default I/O accessors
Date: Thu, 15 Jul 2021 15:53:39 +0000	[thread overview]
Message-ID: <AS8PR04MB8500635E829B332A61AC85C988129@AS8PR04MB8500.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <20210706171106.GE20750@willie-the-truck>



> -----Original Message-----
> From: Will Deacon <will@kernel.org>
> Sent: Tuesday, July 6, 2021 12:11 PM
> To: Frank Li <frank.li@nxp.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>; Zhi Li <lznuaa@gmail.com>;
> Shenwei Wang <shenwei.wang@nxp.com>; Han Xu <han.xu@nxp.com>; Nitin Garg
> <nitin.garg@nxp.com>; Jason Liu <jason.hui.liu@nxp.com>; 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

> 
> Cheers,
> 
> Will

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2021-07-15 15:55 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <AS8PR04MB850004639EE6CE9432BBF13E880F9@AS8PR04MB8500.eurprd04.prod.outlook.com>
     [not found] ` <CAHrpEqRsp2_bt=p5JgS5F-2F_LCwgT+VX7mSENzpEYTQiW1tjg@mail.gmail.com>
2021-06-17  9:27   ` The problem about arm64: io: Relax implicit barriers in default I/O accessors Catalin Marinas
2021-06-17 17:25     ` Will Deacon
2021-06-17 17:41       ` Will Deacon
2021-06-17 20:11         ` [EXT] " Frank Li
2021-06-17 21:40           ` Will Deacon
2021-06-17 22:13             ` Frank Li
2021-06-18 14:56             ` Nitin Garg
2021-06-21 16:11             ` Frank Li
2021-06-21 16:26               ` Will Deacon
2021-06-21 16:59                 ` Will Deacon
2021-06-21 17:56                   ` Frank Li
2021-06-21 18:13                     ` Will Deacon
2021-06-21 21:32                       ` Frank Li
2021-06-22  9:11                         ` Will Deacon
2021-06-23 15:48                           ` Frank Li
2021-07-06 17:11                             ` Will Deacon
2021-07-15 15:53                               ` Frank Li [this message]
2021-07-22 19:14                                 ` Frank Li
2021-08-09 13:50                                   ` Will Deacon
2021-08-09 14:46                                     ` Frank Li
2021-08-09 15:26                                       ` Will Deacon
2021-08-10 18:50                                         ` Frank Li

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