linux-kernel - Re: [PATCH v2 0/3] io.h, logic_pio: Allow barriers for inX() and outX() be overridden

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Date:   Fri, 15 May 2020 15:07:15 +0800
From:   Wei Xu <xuwei5@...ilicon.com>
To:     John Garry <john.garry@...wei.com>, <xuwei5@...wei.com>,
        <arnd@...db.de>
CC:     <okaya@...nel.org>, <bhelgaas@...gle.com>,
        <linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linuxarm@...wei.com>,
        <olof@...om.net>, <jiaxun.yang@...goat.com>
Subject: Re: [PATCH v2 0/3] io.h, logic_pio: Allow barriers for inX() and
 outX() be overridden

Hi John,

On 2020/3/28 0:06, John Garry wrote:
> Since commits a7851aa54c0c ("io: change outX() to have their own IO
> barrier overrides") and 87fe2d543f81 ("io: change inX() to have their own
> IO barrier overrides"), the outX() and inX() functions have memory
> barriers which can be overridden per-arch.
> 
> However, under CONFIG_INDIRECT_PIO, logic_pio defines its own version of
> inX() and outX(), which still use readb et al. For these, the barrier
> after a raw read is weaker than it otherwise would be. 
> 
> This series generates consistent behaviour for logic_pio, by defining
> generic _inX() and _outX() in asm-generic/io.h, and using those in
> logic_pio. Generic _inX() and _outX() have per-arch overrideable
> barriers.
> 
> The topic was discussed there originally:
> https://lore.kernel.org/lkml/2e80d7bc-32a0-cc40-00a9-8a383a1966c2@huawei.com/
> 
> A small tidy-up patch is included.
> 
> I hope that series can go through the arm-soc tree, as with other recent
> logic_pio changes.
> 
> Hi Arnd,
> 
> I added your tag, but please let me know if you have any issue with the
> updated change in patch #1.
> 
> cheers
> 
> - Differences to v1
> 	- fix x86 clang build by adding extra build swicth for _{in,out}X
> 	- added Arnd's RB tag
> 
> John Garry (3):
>   io: Provide _inX() and _outX()
>   logic_pio: Improve macro argument name
>   logic_pio: Use _inX() and _outX()
> 
>  include/asm-generic/io.h | 64 +++++++++++++++++++++++++++++++++---------------
>  lib/logic_pio.c          | 22 ++++++++---------
>  2 files changed, 55 insertions(+), 31 deletions(-)
> 

Thanks!
Series applied to the hisilicon SoC tree.

Best Regards,
Wei