From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Dan Williams <dan.j.williams@intel.com>,
linux-kernel@vger.kernel.org, axboe@kernel.dk,
boaz@plexistor.com, david@fromorbit.com,
linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org,
arnd@arndb.de, ross.zwisler@linux.intel.com,
benh@kernel.crashing.org, linux-nvdimm@ml01.01.org,
heiko.carstens@de.ibm.com, tj@kernel.org, paulus@samba.org,
hpa@zytor.com, schwidefsky@de.ibm.com, willy@linux.intel.com,
akpm@linux-foundation.org, torvalds@linux-foundation.org,
mingo@kernel.org
Subject: Re: [PATCH v4 9/9] x86: convert dma_map_ops to support mapping a __pfn_t.
Date: Tue, 9 Jun 2015 09:47:09 -0400 [thread overview]
Message-ID: <20150609134708.GC15200@x230> (raw)
In-Reply-To: <20150609065854.GD10167@lst.de>
On Tue, Jun 09, 2015 at 08:58:54AM +0200, Christoph Hellwig wrote:
> On Fri, Jun 05, 2015 at 05:19:55PM -0400, Dan Williams wrote:
> > As long as a dma_map_sg() implementation avoids sg_page() conversions it
> > can support scatterlists that carry "page-less" __pfn_t entries.
> > However, a couple implementations require that __pfn_t_has_page() is
> > always true. The Xen swiotlb implementation's entanglements with ARM and
> > the Calgary MMUs requirement to have a pre-existing virtual mapping make
> > them unable to support this conversion (i.e. these now have 'depends on
> > !HAVE_DMA_PFN').
>
> That's why we really need a whole kernel conversion and not just a piecemail
> one. Given how trivial this patch is that doesn't look like a too big
> task ayway.
Aye, and the SWIOTLB (baremetal), Xen SWIOTLB (x86), Xen SWIOTLB (ARM)
can surely be easily tested by the Xen folks if you have patches. Please
just CC the xen-devel@lists.xenproject.org on the patches and shout
out for testing help.
next prev parent reply other threads:[~2015-06-09 13:47 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-05 21:19 [PATCH v4 0/9] introduce __pfn_t, evacuate struct page from sgls Dan Williams
2015-06-05 21:19 ` [PATCH v4 1/9] introduce __pfn_t for scatterlists and pmem Dan Williams
2015-06-05 21:37 ` Linus Torvalds
2015-06-05 22:12 ` Dan Williams
2015-06-05 21:19 ` [PATCH v4 2/9] x86: support kmap_atomic_pfn_t() for persistent memory Dan Williams
2015-06-09 6:50 ` Christoph Hellwig
2015-06-10 12:12 ` Christoph Hellwig
2015-06-10 15:03 ` Matthew Wilcox
2015-06-10 15:11 ` Christoph Hellwig
2015-06-10 15:36 ` Dan Williams
2015-06-10 16:11 ` Christoph Hellwig
2015-06-10 16:17 ` Dan Williams
2015-06-05 21:19 ` [PATCH v4 3/9] dax: drop size parameter to ->direct_access() Dan Williams
2015-06-06 11:37 ` Matthew Wilcox
2015-06-09 6:51 ` Christoph Hellwig
2015-06-05 21:19 ` [PATCH v4 4/9] dax: fix mapping lifetime handling, convert to __pfn_t + kmap_atomic_pfn_t() Dan Williams
2015-06-06 11:58 ` Matthew Wilcox
2015-08-07 23:54 ` Dan Williams
2015-06-08 16:29 ` Elliott, Robert (Server Storage)
2015-06-08 16:36 ` Dan Williams
2015-06-09 6:55 ` Christoph Hellwig
2015-06-05 21:19 ` [PATCH v4 5/9] dma-mapping: allow archs to optionally specify a ->map_pfn() operation Dan Williams
2015-06-05 21:19 ` [PATCH v4 6/9] scatterlist: use sg_phys() Dan Williams
2015-06-09 6:59 ` Christoph Hellwig
2015-06-05 21:19 ` [PATCH v4 7/9] scatterlist: cleanup sg_chain() and sg_unmark_end() Dan Williams
2015-06-05 21:19 ` [PATCH v4 8/9] scatterlist: convert to __pfn_t Dan Williams
2015-06-05 21:19 ` [PATCH v4 9/9] x86: convert dma_map_ops to support mapping a __pfn_t Dan Williams
2015-06-09 6:58 ` Christoph Hellwig
2015-06-09 13:47 ` Konrad Rzeszutek Wilk [this message]
2015-06-05 21:23 ` [PATCH v4 0/9] introduce __pfn_t, evacuate struct page from sgls Dan Williams
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