From: Niklas Cassel <Niklas.Cassel@wdc.com>
To: John Garry <john.garry@huawei.com>
Cc: "Ajish.Koshy@microchip.com" <Ajish.Koshy@microchip.com>,
"jinpu.wang@cloud.ionos.com" <jinpu.wang@cloud.ionos.com>,
"jejb@linux.ibm.com" <jejb@linux.ibm.com>,
"martin.petersen@oracle.com" <martin.petersen@oracle.com>,
"Viswas.G@microchip.com" <Viswas.G@microchip.com>,
"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Damien Le Moal <damien.lemoal@opensource.wdc.com>
Subject: Re: [PATCH] scsi: pm8001: Fix phys_to_virt() usage on dma_addr_t
Date: Mon, 6 Dec 2021 13:24:19 +0000 [thread overview]
Message-ID: <Ya4PAu4Xj8UGHEV7@x1-carbon> (raw)
In-Reply-To: <a60318ef-dc19-a146-5ac3-16eae38b8c37@huawei.com>
On Mon, Dec 06, 2021 at 09:42:23AM +0000, John Garry wrote:
> On 29/11/2021 10:46, Ajish.Koshy@microchip.com wrote:
> > Thanks John for the update. Based on the given issue,
> > we never tested on arm server.
> >
> > Further arm testing will depend on the availability of
> > the server.
> >
> > Meanwhile will do further test on x86 and update
> > on the observations.
>
> Have you tested on x86 with the IOMMU enabled? From my limited experience,
> out of the box the IOMMU is disabled in the BIOS on x86 machines - that is a
> very general statement. But this is not just an issue specific to arm64.
My limited experience tells me the opposite, that modern x64 servers
have IOMMU enabled by default:
E.g.:
https://www.dell.com/support/manuals/en-uk/poweredge-r7515/r7515_bios_pub/processor-settings?guid=guid-ec36d324-4f45-4bc1-bb51-de2db7cc5cd9&lang=en-us
https://support.hpe.com/hpesc/public/docDisplay?docId=a00025662en_us&docLocale=en_US
This driver not working properly on a system with an IOMMU just tells
us that the number of mainline users of this driver is very low :/
Kind regards,
Niklas
next prev parent reply other threads:[~2021-12-06 13:24 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-26 15:35 [PATCH] scsi: pm8001: Fix phys_to_virt() usage on dma_addr_t John Garry
2021-11-29 10:46 ` Ajish.Koshy
2021-12-06 9:42 ` John Garry
2021-12-06 13:24 ` Niklas Cassel [this message]
2021-12-07 10:36 ` Ajish.Koshy
2021-12-07 13:54 ` John Garry
2021-12-09 12:04 ` Ajish.Koshy
2021-12-09 12:19 ` John Garry
2021-12-09 22:38 ` Damien Le Moal
2021-12-09 23:09 ` John Garry
2021-12-09 23:55 ` Damien Le Moal
2021-12-10 10:35 ` John Garry
2021-12-11 0:19 ` Damien Le Moal
2021-12-09 22:26 ` Damien Le Moal
2021-12-09 13:46 ` John Garry
2021-12-10 10:23 ` Ajish.Koshy
2021-12-10 10:44 ` John Garry
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