From: Christopher Lameter <cl@linux.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: Michal Hocko <mhocko@kernel.org>,
Christoph Hellwig <hch@infradead.org>,
"Luis R. Rodriguez" <mcgrof@kernel.org>,
linux-mm@kvack.org, Jan Kara <jack@suse.cz>,
matthew@wil.cx, x86@kernel.org, luto@amacapital.net,
martin.petersen@oracle.com, jthumshirn@suse.de,
broonie@kernel.org, linux-spi@vger.kernel.org,
linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
"lsf-pc@lists.linux-foundation.org"
<lsf-pc@lists.linux-foundation.org>
Subject: Re: [LSF/MM TOPIC NOTES] x86 ZONE_DMA love
Date: Fri, 27 Apr 2018 11:36:23 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.20.1804271136030.11686@nuc-kabylake> (raw)
In-Reply-To: <20180427161813.GD8161@bombadil.infradead.org>
On Fri, 27 Apr 2018, Matthew Wilcox wrote:
> Some devices have incredibly bogus hardware like 28 bit addressing
> or 39 bit addressing. We don't have a good way to allocate memory by
> physical address other than than saying "GFP_DMA for anything less than
> 32, GFP_DMA32 (or GFP_KERNEL on 32-bit) for anything less than 64 bit".
>
> Even CMA doesn't have a "cma_alloc_phys()". Maybe that's the right place
> to put such an allocation API.
The other way out of this would be to require a IOMMU?
next prev parent reply other threads:[~2018-04-27 16:36 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-26 21:54 [LSF/MM TOPIC NOTES] x86 ZONE_DMA love Luis R. Rodriguez
2018-04-27 1:09 ` [Lsf-pc] " Rik van Riel
2018-04-27 5:35 ` Christoph Hellwig
2018-04-27 7:18 ` Michal Hocko
2018-04-27 16:07 ` Christopher Lameter
2018-04-27 16:18 ` Matthew Wilcox
2018-04-27 16:36 ` Christopher Lameter [this message]
2018-04-28 8:33 ` Christoph Hellwig
2018-04-27 16:37 ` Michal Hocko
2018-04-28 8:33 ` Christoph Hellwig
2018-04-28 8:30 ` Christoph Hellwig
2018-04-27 16:14 ` Luis R. Rodriguez
2018-04-27 16:28 ` Matthew Wilcox
2018-04-28 8:42 ` Christoph Hellwig
2018-04-28 18:55 ` Luis R. Rodriguez
2018-04-28 19:46 ` Julia Lawall
2018-04-28 20:41 ` Matthew Wilcox
2018-04-29 14:34 ` Julia Lawall
[not found] ` <CAFhKne8u7KcBkpgiQ0fFZyh5_EorfY-_MJJaEYk3feCOd9LsRQ@mail.gmail.com>
2018-05-03 12:03 ` Michal Hocko
2018-05-03 12:13 ` Christoph Hellwig
2018-05-03 8:20 ` Geert Uytterhoeven
2018-05-05 16:08 ` Are media drivers abusing of GFP_DMA? - was: " Mauro Carvalho Chehab
2018-05-07 13:26 ` Laurent Pinchart
2018-05-07 15:19 ` Mauro Carvalho Chehab
2018-05-14 8:00 ` Fabien DESSENNE
2018-05-14 10:35 ` Mauro Carvalho Chehab
2018-05-14 10:39 ` Mauro Carvalho Chehab
2018-05-15 7:30 ` Fabien DESSENNE
2018-05-15 8:27 ` Laurent Pinchart
2018-05-15 10:30 ` Mauro Carvalho Chehab
2018-05-15 16:24 ` Luis R. Rodriguez
2018-05-10 4:39 ` Yasunari.Takiguchi
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