From: Fredrik Noring <noring@nocrew.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Robin Murphy <robin.murphy@arm.com>,
m.szyprowski@samsung.com, Geoff Levand <geoff@infradead.org>,
iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
JuergenUrban@gmx.de
Subject: Re: [PATCH] dma-mapping: Relax warnings for per-device areas
Date: Tue, 17 Jul 2018 18:33:30 +0200 [thread overview]
Message-ID: <20180717163330.GE2342@localhost.localdomain> (raw)
In-Reply-To: <20180717145725.GA22109@lst.de>
Hi Christoph, Geoff,
[ CC-ing Geoff to give him an opportunity to chime in about the PS3 part. ]
> > Here are three other regressions related to the coherent mask WARN_ON_ONCE:
>
> They are a pretty strong indication that yes, you should really set
> the coherent mask if you ever do coherent allocations..
I'm unfortunately unfamiliar with the USB drivers for the PS3. Geoff, what
do you think about setting a coherent mask?
Christoph, what mask value would you suggest for the PS2 driver? Typical
DMA addresses 0-0x200000 are mapped to 0x1c000000-0x1c200000 and is memory
managed exclusively by the IOP. Robin indicated that DMA_BIT_MASK(20) or a
nonzero but useless value such as 1 are possibly candidates. It seems quite
unclear what the coherent mask actually means in this case, doesn't it?
Fredrik
next prev parent reply other threads:[~2018-07-17 16:33 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-03 13:08 [PATCH] dma-mapping: Relax warnings for per-device areas Robin Murphy
2018-07-03 13:08 ` Robin Murphy
[not found] ` <1f8262d206c6886072d04cc93454f6e3f812bd20.1530623284.git.robin.murphy-5wv7dgnIgG8@public.gmane.org>
2018-07-03 16:47 ` Fredrik Noring
2018-07-03 16:47 ` Fredrik Noring
2018-07-05 19:36 ` Christoph Hellwig
2018-07-05 19:36 ` Christoph Hellwig
[not found] ` <20180705193613.GA28905-jcswGhMUV9g@public.gmane.org>
2018-07-06 11:57 ` Robin Murphy
2018-07-06 11:57 ` Robin Murphy
[not found] ` <5811ebe5-b2bd-efc1-bf54-a8f05432c4f8-5wv7dgnIgG8@public.gmane.org>
2018-07-06 14:19 ` Fredrik Noring
2018-07-06 14:19 ` Fredrik Noring
[not found] ` <20180706141926.GA2313-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2018-07-06 16:46 ` Robin Murphy
2018-07-06 16:46 ` Robin Murphy
[not found] ` <bd63815c-260e-078f-4184-561c8e54e636-5wv7dgnIgG8@public.gmane.org>
2018-07-06 20:54 ` Fredrik Noring
2018-07-06 20:54 ` Fredrik Noring
2018-07-06 23:35 ` Aw: " "Jürgen Urban"
2018-07-06 23:35 ` "Jürgen Urban"
2018-07-07 6:32 ` Fredrik Noring
2018-07-07 6:32 ` Fredrik Noring
2018-07-08 20:47 ` Aw: " "Jürgen Urban"
2018-07-15 12:28 ` Fredrik Noring
2018-07-15 12:28 ` Fredrik Noring
2018-07-17 14:57 ` Christoph Hellwig
2018-07-17 16:33 ` Fredrik Noring [this message]
2018-07-18 21:55 ` Geoff Levand
2018-07-19 13:16 ` Christoph Hellwig
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