From: "Raj, Ashok" <ashok.raj@intel.com>
To: Robin Murphy <robin.murphy@arm.com>
Cc: Casey Leedom <leedom@chelsio.com>,
"joro@8bytes.org" <joro@8bytes.org>,
"dwmw2@infradead.org" <dwmw2@infradead.org>,
Harsh Jain <Harsh@chelsio.com>,
"herbert@gondor.apana.org.au" <herbert@gondor.apana.org.au>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Michael Werner <werner@chelsio.com>,
Atul Gupta <atul.gupta@chelsio.com>
Subject: Re: [PATCH] iommu/vt-d: Fix scatterlist offset handling
Date: Thu, 28 Sep 2017 08:43:46 -0700 [thread overview]
Message-ID: <20170928154345.GA101272@otc-nc-03> (raw)
In-Reply-To: <a135090f-27e2-cf69-b3a7-c9d0e101bf07@arm.com>
Hi Robin
thanks.. i have no idea.. i see all the other patches from you :-)
my email has decided to play games with me i suppose :-)
On Thu, Sep 28, 2017 at 05:59:11PM +0100, Robin Murphy wrote:
> I hope our email server hasn't got blacklisted again... Said patch is
> the top of this very thread we're replying on[1] - you were definitely
> on cc :(
(sg->dma_address + sg->dma_len) ----+
sg->dma_address ---------+ |
iov_pfn------+ | |
| | |
v v v
iova: a b c d e f
|--------|--------|--------|--------|--------|
<...calculated....>
[_____mapped______]
pfn: 0 1 2 3 4 5
|--------|--------|--------|--------|--------|
^ ^ ^
| | |
sg->page ----+ | |
sg->offset --------------+ |
(sg->offset + sg->length) ----------+
The picture seems right. Looking at the code i'm not sure if i understand
it correctly.
pgoff = sg->offset & ~PAGE_MASK;
this gets the offset past the start of page.
sg->dma_address = ((dma_addr_t)iov_pfn << VTD_PAGE_SHIFT) + pgoff;
this would set dma_address at b+off instead of starting at c+off correct?
>
> Robin
>
> [1]:https://lists.linuxfoundation.org/pipermail/iommu/2017-September/024371.html
next prev parent reply other threads:[~2017-09-28 18:39 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-28 14:14 [PATCH] iommu/vt-d: Fix scatterlist offset handling Robin Murphy
2017-09-28 16:17 ` Casey Leedom
2017-09-28 13:29 ` Raj, Ashok
2017-09-28 16:59 ` Robin Murphy
2017-09-28 15:43 ` Raj, Ashok [this message]
2017-10-03 19:36 ` Raj, Ashok
2017-09-29 8:14 ` Harsh Jain
[not found] ` <fe25071a-18bf-e468-01e7-36515f2110e2-ut6Up61K2wZBDgjK7y7TUQ@public.gmane.org>
2017-09-29 16:18 ` Casey Leedom
2017-09-29 16:18 ` Casey Leedom
[not found] ` <MWHPR12MB160034E91A834504FE85C07BC87E0-Gy0DoCVfaSVsWITs4OkDoAdYzm3356FpvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
2017-10-03 12:22 ` Harsh Jain
2017-10-03 22:22 ` Casey Leedom
[not found] ` <644c3e01654f8bd48d669c36e424959d6ef0e27e.1506607370.git.robin.murphy-5wv7dgnIgG8@public.gmane.org>
2017-10-03 12:55 ` David Woodhouse
2017-10-03 12:55 ` David Woodhouse
2017-10-03 18:05 ` Robin Murphy
2017-10-03 22:16 ` David Woodhouse
2017-10-04 11:18 ` Robin Murphy
2017-10-06 14:43 ` Joerg Roedel
2017-10-06 12:54 ` Raj, Ashok
[not found] ` <20171006144309.GA30803-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2017-11-06 18:47 ` Jacob Pan
2017-11-06 18:47 ` Jacob Pan
2017-11-15 23:54 ` Jacob Pan
2017-11-15 23:54 ` Jacob Pan
2017-11-16 21:32 ` Alex Williamson
[not found] ` <20171116143244.2583d044-1yVPhWWZRC1BDLzU/O5InQ@public.gmane.org>
2017-11-16 21:09 ` Raj, Ashok
2017-11-16 21:09 ` Raj, Ashok
2017-11-17 16:18 ` Alex Williamson
2017-11-17 16:18 ` Alex Williamson
2017-11-17 15:48 ` Raj, Ashok
2017-11-17 17:44 ` Casey Leedom
2017-11-17 17:44 ` Casey Leedom
2017-11-17 17:44 ` Casey Leedom
[not found] ` <SN1PR12MB035214EF471935B6F4220E36C82F0-z7L1TMIYDg4e2a8M8f4RFAdYzm3356FpvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
2017-11-17 18:09 ` Jacob Pan
2017-11-17 18:09 ` Jacob Pan
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