From: Peter Hurley <peter-WaGBZJeGNqdsbIuE7sb01tBPR1lH4CV8@public.gmane.org>
To: Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
Cc: Andi Kleen <andi-Vw/NltI1exuRpAAqCnN02g@public.gmane.org>,
Greg KH <greg-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>,
x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
Akinobu Mita
<akinobu.mita-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
Ingo Molnar <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
"H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
David Woodhouse <dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Subject: Re: [PATCH v3 0/5] enhance DMA CMA on x86
Date: Tue, 30 Sep 2014 21:49:54 -0400 [thread overview]
Message-ID: <542B5DC2.8020806@hurleysoftware.com> (raw)
In-Reply-To: <alpine.DEB.2.11.1410010131380.4455@nanos>
On 09/30/2014 07:45 PM, Thomas Gleixner wrote:
> Whether the proposed patchset is the correct solution to support it is
> a completely different question.
This patchset has been in mainline since 3.16 and has already caused
regressions, so the question of whether this is the correct solution has
already been answered.
> So either you stop this right now and help Akinobu to find the proper
> solution
If this is only a test platform for ARM parts then I don't think it
unreasonable to suggest forking x86 swiotlb support into a iommu=cma
selector that gets DMA mapping working for this test platform and doesn't
cause a bunch of breakage.
Which is different than if the plan is to ship production units for x86;
then a general purpose solution will be required.
As to the good design of a general purpose solution for allocating and
mapping huge order pages, you are certainly more qualified to help Akinobu
than I am.
Regards,
Peter Hurley
WARNING: multiple messages have this Message-ID (diff)
From: Peter Hurley <peter@hurleysoftware.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Akinobu Mita <akinobu.mita@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
David Woodhouse <dwmw2@infradead.org>,
Don Dutile <ddutile@redhat.com>, Ingo Molnar <mingo@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Andi Kleen <andi@firstfloor.org>,
x86@kernel.org, iommu@lists.linux-foundation.org,
Greg KH <greg@kroah.com>
Subject: Re: [PATCH v3 0/5] enhance DMA CMA on x86
Date: Tue, 30 Sep 2014 21:49:54 -0400 [thread overview]
Message-ID: <542B5DC2.8020806@hurleysoftware.com> (raw)
In-Reply-To: <alpine.DEB.2.11.1410010131380.4455@nanos>
On 09/30/2014 07:45 PM, Thomas Gleixner wrote:
> Whether the proposed patchset is the correct solution to support it is
> a completely different question.
This patchset has been in mainline since 3.16 and has already caused
regressions, so the question of whether this is the correct solution has
already been answered.
> So either you stop this right now and help Akinobu to find the proper
> solution
If this is only a test platform for ARM parts then I don't think it
unreasonable to suggest forking x86 swiotlb support into a iommu=cma
selector that gets DMA mapping working for this test platform and doesn't
cause a bunch of breakage.
Which is different than if the plan is to ship production units for x86;
then a general purpose solution will be required.
As to the good design of a general purpose solution for allocating and
mapping huge order pages, you are certainly more qualified to help Akinobu
than I am.
Regards,
Peter Hurley
next prev parent reply other threads:[~2014-10-01 1:49 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-15 13:08 [PATCH v3 0/5] enhance DMA CMA on x86 Akinobu Mita
2014-04-15 13:08 ` Akinobu Mita
[not found] ` <1397567329-3771-1-git-send-email-akinobu.mita-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-04-15 13:08 ` [PATCH v3 1/5] x86: make dma_alloc_coherent() return zeroed memory if CMA is enabled Akinobu Mita
2014-04-15 13:08 ` Akinobu Mita
[not found] ` <1397567329-3771-2-git-send-email-akinobu.mita-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-04-16 19:44 ` Andrew Morton
2014-04-16 19:44 ` Andrew Morton
[not found] ` <20140416124406.b6a3f8c9f6e7eb7328ebb5cb-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2014-04-17 15:40 ` Akinobu Mita
2014-04-17 15:40 ` Akinobu Mita
2014-04-15 13:08 ` [PATCH v3 2/5] x86: enable DMA CMA with swiotlb Akinobu Mita
2014-04-15 13:08 ` Akinobu Mita
2014-04-15 13:08 ` [PATCH v3 3/5] intel-iommu: integrate DMA CMA Akinobu Mita
2014-04-15 13:08 ` Akinobu Mita
2014-04-15 13:08 ` [PATCH v3 4/5] memblock: introduce memblock_alloc_range() Akinobu Mita
2014-04-15 13:08 ` Akinobu Mita
2014-04-15 13:08 ` [PATCH v3 5/5] cma: add placement specifier for "cma=" kernel parameter Akinobu Mita
2014-04-15 13:08 ` Akinobu Mita
2014-09-27 14:30 ` [PATCH v3 0/5] enhance DMA CMA on x86 Peter Hurley
[not found] ` <5426CA0A.7000806-WaGBZJeGNqdsbIuE7sb01tBPR1lH4CV8@public.gmane.org>
2014-09-28 0:31 ` Akinobu Mita
2014-09-28 0:31 ` Akinobu Mita
[not found] ` <CAC5umyhgs8---HZLa7_DOSbqW0uPbLgqTfBweScZSR9oWbG9xg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-09-29 12:09 ` Peter Hurley
2014-09-29 12:09 ` Peter Hurley
[not found] ` <54294C0B.1060705-WaGBZJeGNqdsbIuE7sb01tBPR1lH4CV8@public.gmane.org>
2014-09-29 14:32 ` Akinobu Mita
2014-09-29 14:32 ` Akinobu Mita
2014-09-30 14:34 ` Peter Hurley
2014-09-30 14:34 ` Peter Hurley
[not found] ` <542ABF77.1020402-WaGBZJeGNqdsbIuE7sb01tBPR1lH4CV8@public.gmane.org>
2014-09-30 23:23 ` Akinobu Mita
2014-09-30 23:23 ` Akinobu Mita
2014-09-30 23:45 ` Thomas Gleixner
2014-09-30 23:49 ` Peter Hurley
2014-09-30 23:49 ` Peter Hurley
2014-10-01 1:49 ` Peter Hurley [this message]
2014-10-01 1:49 ` Peter Hurley
2014-10-01 9:05 ` Thomas Gleixner
[not found] ` <542B5DC2.8020806-WaGBZJeGNqdsbIuE7sb01tBPR1lH4CV8@public.gmane.org>
2014-10-02 16:41 ` Konrad Rzeszutek Wilk
2014-10-02 16:41 ` Konrad Rzeszutek Wilk
[not found] ` <20141002164121.GF1715-0iZWjJA6G8GSPmnEAIUT9EEOCMrvLtNR@public.gmane.org>
2014-10-02 22:03 ` Peter Hurley
2014-10-02 22:03 ` Peter Hurley
[not found] ` <542DCB9C.4020703-WaGBZJeGNqdsbIuE7sb01tBPR1lH4CV8@public.gmane.org>
2014-10-02 23:08 ` Akinobu Mita
2014-10-02 23:08 ` Akinobu Mita
[not found] ` <CAC5umyjHruhnwiKwrHLBAF+g0ZDVouuuNvrisrUH8o963GyytQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-10-03 13:40 ` Konrad Rzeszutek Wilk
2014-10-03 13:40 ` Konrad Rzeszutek Wilk
2014-10-03 14:27 ` Peter Hurley
2014-10-03 14:27 ` Peter Hurley
[not found] ` <542EB242.4090102-WaGBZJeGNqdsbIuE7sb01tBPR1lH4CV8@public.gmane.org>
2014-10-03 16:06 ` Akinobu Mita
2014-10-03 16:06 ` Akinobu Mita
[not found] ` <CAC5umygJ3EDOb4E29+YPo4t4Ew_K3x7jpxLrmvNco3U=UJBCrA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-10-03 16:33 ` konrad wilk
2014-10-03 16:33 ` konrad wilk
2014-10-03 16:39 ` Peter Hurley
2014-10-03 16:39 ` Peter Hurley
[not found] ` <542ED130.2090501-WaGBZJeGNqdsbIuE7sb01tBPR1lH4CV8@public.gmane.org>
2014-10-05 6:01 ` Akinobu Mita
2014-10-05 6:01 ` Akinobu Mita
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=542B5DC2.8020806@hurleysoftware.com \
--to=peter-wagbzjegnqdsbiue7sb01tbpr1lh4cv8@public.gmane.org \
--cc=akinobu.mita-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org \
--cc=akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org \
--cc=andi-Vw/NltI1exuRpAAqCnN02g@public.gmane.org \
--cc=dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org \
--cc=greg-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org \
--cc=hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org \
--cc=iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org \
--cc=linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org \
--cc=tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org \
--cc=x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.