From: Dan Williams <dan.j.williams-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
To: Casey Leedom <leedom-ut6Up61K2wZBDgjK7y7TUQ@public.gmane.org>
Cc: Herbert Xu
<herbert-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>,
"dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org"
<dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org"
<iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>,
"linux-crypto-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-crypto-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Harsh Jain <Harsh-ut6Up61K2wZBDgjK7y7TUQ@public.gmane.org>,
David Woodhouse
<David.Woodhouse-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Subject: Re: DMA error when sg->offset value is greater than PAGE_SIZE in Intel IOMMU
Date: Mon, 25 Sep 2017 13:11:04 -0700 [thread overview]
Message-ID: <CAPcyv4ihhJM5+iHTMzH2m5n7X5347MHkj0h2DC5KGobjby5nmg@mail.gmail.com> (raw)
In-Reply-To: <MWHPR12MB1600948B2F57696189FC7C22C87A0-Gy0DoCVfaSVsWITs4OkDoAdYzm3356FpvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
On Mon, Sep 25, 2017 at 1:05 PM, Casey Leedom <leedom-ut6Up61K2wZBDgjK7y7TUQ@public.gmane.org> wrote:
> | From: Dan Williams <dan.j.williams-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> | Sent: Monday, September 25, 2017 12:31 PM
> | ...
> | IIUC it looks like this has been broken ever since commit e1605495c716
> | "intel-iommu: Introduce domain_sg_mapping() to speed up
> | intel_map_sg()". I.e. it looks like the calculation for pte_val should
> | be:
> |
> | pteval = (page_to_phys(sg_page(sg)) + sg->offset) | prot;
>
> Hhmmm, shouldn't that be:
>
> pteval = (page_to_phys(sg_page(sg)) + (sg->offset>>PAGE_SHIFT)) | prot;
Yes, I think you're right. We do want to mask off the page-unaligned
portion of sg->offset.
next prev parent reply other threads:[~2017-09-25 20:11 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-16 6:11 DMA error when sg->offset value is greater than PAGE_SIZE in Intel IOMMU Harsh Jain
2017-09-20 8:01 ` Herbert Xu
2017-09-20 10:12 ` Robin Murphy
2017-09-20 11:20 ` Harsh Jain
2017-09-25 17:46 ` Casey Leedom
2017-09-25 15:54 ` Raj, Ashok
2017-09-25 18:46 ` Casey Leedom
2017-09-26 3:46 ` Harsh Jain
[not found] ` <afa02763-4556-0e14-7d1b-1c044cdc1ff7-ut6Up61K2wZBDgjK7y7TUQ@public.gmane.org>
2017-09-26 12:21 ` Harsh Jain
2017-09-26 14:22 ` Robin Murphy
2017-09-26 14:34 ` Raj, Ashok
2017-09-26 14:40 ` Raj, Ashok
2017-09-26 20:50 ` Casey Leedom
2017-09-26 18:15 ` Robin Murphy
[not found] ` <437a9bd8-d4d6-22ca-1a64-1a3e73f1101a-5wv7dgnIgG8@public.gmane.org>
2017-09-26 16:06 ` Casey Leedom
2017-09-26 16:10 ` Dan Williams
2017-09-27 16:31 ` Casey Leedom
[not found] ` <MWHPR12MB160060436AC70CB5BE8C0C6EC8780-Gy0DoCVfaSVsWITs4OkDoAdYzm3356FpvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
2017-09-27 17:13 ` Dan Williams
2017-10-01 8:59 ` Christoph Hellwig
2017-09-27 17:18 ` Robin Murphy
[not found] ` <20170927181802.3dcd7efb-h2/QxWiDqNo@public.gmane.org>
2017-09-27 14:48 ` Raj, Ashok
2017-09-27 21:29 ` Casey Leedom
[not found] ` <MWHPR12MB16005D59D7A33F3D5BE43395C8780-Gy0DoCVfaSVsWITs4OkDoAdYzm3356FpvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
2017-09-27 19:07 ` Raj, Ashok
2017-09-27 22:13 ` Casey Leedom
2017-09-28 5:01 ` Harsh Jain
[not found] ` <MWHPR12MB16007E5363E79173C52BFA19C8780-Gy0DoCVfaSVsWITs4OkDoAdYzm3356FpvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
2017-09-28 10:33 ` Herbert Xu
[not found] ` <20170928103312.GB8118-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>
2017-09-28 11:11 ` Harsh Jain
2017-09-28 13:38 ` Harsh Jain
2017-09-28 13:05 ` Raj, Ashok
2017-09-29 5:37 ` Harsh Jain
2017-09-27 17:30 ` Casey Leedom
2017-09-26 17:30 ` Casey Leedom
2017-09-25 19:31 ` Dan Williams
[not found] ` <CAPcyv4j3J41eY2eR07nTvo75F0yCbL9bNHM8GmXEFOHDQUuf8Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-09-25 20:05 ` Casey Leedom
[not found] ` <MWHPR12MB1600948B2F57696189FC7C22C87A0-Gy0DoCVfaSVsWITs4OkDoAdYzm3356FpvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
2017-09-25 20:11 ` Dan Williams [this message]
2017-09-25 19:03 ` Raj, Ashok
2017-09-25 23:41 ` Casey Leedom
2017-09-26 13:04 ` Harsh Jain
2017-09-20 11:30 ` Harsh Jain
2017-09-25 18:45 ` David Woodhouse
2017-09-25 20:19 ` Casey Leedom
2017-09-26 11:17 ` Harsh Jain
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