From: Timur Tabi <timur@codeaurora.org>
To: Arnd Bergmann <arnd@arndb.de>, Sinan Kaya <okaya@codeaurora.org>
Cc: linux-arm-kernel@lists.infradead.org,
Abhijit Mahajan <abhijit.mahajan@avagotech.com>,
Nagalakshmi Nandigama <nagalakshmi.nandigama@avagotech.com>,
linux-scsi@vger.kernel.org, jcm@redhat.com,
"James E.J. Bottomley" <JBottomley@odin.com>,
linux-kernel@vger.kernel.org,
Sreekanth Reddy <sreekanth.reddy@avagotech.com>,
Praveen Krishnamoorthy <praveen.krishnamoorthy@avagotech.com>,
cov@codeaurora.org, linux-arm-msm@vger.kernel.org,
agross@codeaurora.org, MPT-FusionLinux.pdl@avagotech.com,
Hannes Reinecke <hare@suse.de>
Subject: Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA fails
Date: Tue, 10 Nov 2015 11:00:59 -0600 [thread overview]
Message-ID: <564222CB.3000701@codeaurora.org> (raw)
In-Reply-To: <4982446.ZlJVrezq1Y@wuerfel>
On 11/10/2015 10:47 AM, Arnd Bergmann wrote:
> What BenH was worried about here is that the driver sets different masks
> for streaming and coherent mappings, which is indeed a worry that
> could hit us on ARM as well, but I suppose we'll have to deal with
> that in platform code.
>
> Setting both masks to 32-bit is something that a lot of drivers do,
> and without IOMMU enabled, you'd hit the same bug on all of them.
Also note that I think that on PowerPC, the mask is set to 32 by default
for all devices. I don't think we do that on ARM64. So on PowerPC,
some drivers get away with not explicitly setting the mask.
--
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.
WARNING: multiple messages have this Message-ID (diff)
From: timur@codeaurora.org (Timur Tabi)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA fails
Date: Tue, 10 Nov 2015 11:00:59 -0600 [thread overview]
Message-ID: <564222CB.3000701@codeaurora.org> (raw)
In-Reply-To: <4982446.ZlJVrezq1Y@wuerfel>
On 11/10/2015 10:47 AM, Arnd Bergmann wrote:
> What BenH was worried about here is that the driver sets different masks
> for streaming and coherent mappings, which is indeed a worry that
> could hit us on ARM as well, but I suppose we'll have to deal with
> that in platform code.
>
> Setting both masks to 32-bit is something that a lot of drivers do,
> and without IOMMU enabled, you'd hit the same bug on all of them.
Also note that I think that on PowerPC, the mask is set to 32 by default
for all devices. I don't think we do that on ARM64. So on PowerPC,
some drivers get away with not explicitly setting the mask.
--
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.
next prev parent reply other threads:[~2015-11-10 17:00 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-09 1:57 [PATCH V2 0/3] scsi: mptxsas: updates for ARM64 Sinan Kaya
2015-11-09 1:57 ` Sinan Kaya
2015-11-09 1:57 ` [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA fails Sinan Kaya
2015-11-09 1:57 ` Sinan Kaya
2015-11-09 7:09 ` Hannes Reinecke
2015-11-09 7:09 ` Hannes Reinecke
2015-11-09 8:59 ` Arnd Bergmann
2015-11-09 8:59 ` Arnd Bergmann
2015-11-09 14:07 ` Sinan Kaya
2015-11-09 14:07 ` Sinan Kaya
2015-11-09 14:33 ` Arnd Bergmann
2015-11-09 14:33 ` Arnd Bergmann
2015-11-09 23:22 ` Sinan Kaya
2015-11-09 23:22 ` Sinan Kaya
2015-11-09 23:29 ` Timur Tabi
2015-11-09 23:29 ` Timur Tabi
2015-11-10 8:38 ` Arnd Bergmann
2015-11-10 8:38 ` Arnd Bergmann
2015-11-10 16:06 ` Sinan Kaya
2015-11-10 16:06 ` Sinan Kaya
2015-11-10 16:47 ` Arnd Bergmann
2015-11-10 16:47 ` Arnd Bergmann
2015-11-10 17:00 ` Timur Tabi [this message]
2015-11-10 17:00 ` Timur Tabi
2015-11-10 19:13 ` Arnd Bergmann
2015-11-10 19:13 ` Arnd Bergmann
2015-11-10 21:03 ` Timur Tabi
2015-11-10 21:03 ` Timur Tabi
2015-11-10 21:54 ` Arnd Bergmann
2015-11-10 21:54 ` Arnd Bergmann
2015-11-10 21:59 ` Timur Tabi
2015-11-10 21:59 ` Timur Tabi
2015-11-10 22:08 ` Arnd Bergmann
2015-11-10 22:08 ` Arnd Bergmann
2015-11-10 17:19 ` Sinan Kaya
2015-11-10 17:19 ` Sinan Kaya
2015-11-10 18:27 ` James Bottomley
2015-11-10 18:27 ` James Bottomley
2015-11-10 19:14 ` Sinan Kaya
2015-11-10 19:14 ` Sinan Kaya
2015-11-10 19:43 ` James Bottomley
2015-11-10 19:43 ` James Bottomley
2015-11-10 19:56 ` Sinan Kaya
2015-11-10 19:56 ` Sinan Kaya
2015-11-10 20:05 ` James Bottomley
2015-11-10 20:05 ` James Bottomley
2015-11-10 20:26 ` Sinan Kaya
2015-11-10 20:26 ` Sinan Kaya
2015-11-10 20:35 ` James Bottomley
2015-11-10 20:35 ` James Bottomley
2015-11-10 19:56 ` Arnd Bergmann
2015-11-10 19:56 ` Arnd Bergmann
2015-11-10 20:58 ` Sinan Kaya
2015-11-10 20:58 ` Sinan Kaya
2015-11-10 22:06 ` Arnd Bergmann
2015-11-10 22:06 ` Arnd Bergmann
2015-11-09 14:00 ` Sinan Kaya
2015-11-09 14:00 ` Sinan Kaya
2015-11-09 1:57 ` [PATCH V2 2/3] scsi: fix compiler warning for sg Sinan Kaya
2015-11-09 1:57 ` Sinan Kaya
2015-11-09 14:14 ` Andy Shevchenko
2015-11-09 14:14 ` Andy Shevchenko
2015-11-10 3:21 ` Sinan Kaya
2015-11-10 3:21 ` Sinan Kaya
2015-11-10 3:21 ` Sinan Kaya
2015-11-10 3:26 ` Timur Tabi
2015-11-10 3:26 ` Timur Tabi
2015-11-10 4:51 ` Sinan Kaya
2015-11-10 4:51 ` Sinan Kaya
2015-11-10 4:53 ` Timur Tabi
2015-11-10 4:53 ` Timur Tabi
2015-11-10 9:23 ` Andy Shevchenko
2015-11-10 9:23 ` Andy Shevchenko
2015-11-10 10:09 ` Arnd Bergmann
2015-11-10 10:09 ` Arnd Bergmann
2015-11-09 1:57 ` [PATCH V2 3/3] scsi: mptxsas: offload IRQ execution Sinan Kaya
2015-11-09 1:57 ` Sinan Kaya
2015-11-09 7:15 ` Hannes Reinecke
2015-11-09 7:15 ` Hannes Reinecke
2015-11-09 14:01 ` Sinan Kaya
2015-11-09 14:01 ` Sinan Kaya
2015-11-10 5:59 ` Sinan Kaya
2015-11-10 5:59 ` Sinan Kaya
2015-11-10 5:59 ` Sinan Kaya
2016-03-16 15:31 ` Christopher Covington
2016-03-16 15:31 ` Christopher Covington
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