linux-kernel - Re: [PATCH v4 0/9] introduce __pfn_t, evacuate struct page from sgls

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Message-ID: <CAPcyv4i+qGpb1sDPDUksB9YuFGPtNjqhJbVt5GmSt8mfoZYJkg@mail.gmail.com>
Date:	Fri, 5 Jun 2015 14:23:41 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:	Jens Axboe <axboe@...nel.dk>, Boaz Harrosh <boaz@...xistor.com>,
	david <david@...morbit.com>, linux-arch@...r.kernel.org,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Christoph Hellwig <hch@....de>,
	Julia Lawall <Julia.Lawall@...6.fr>,
	Paul Mackerras <paulus@...ba.org>,
	"H. Peter Anvin" <hpa@...or.com>, Tejun Heo <tj@...nel.org>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>
Subject: Re: [PATCH v4 0/9] introduce __pfn_t, evacuate struct page from sgls

On Fri, Jun 5, 2015 at 2:19 PM, Dan Williams <dan.j.williams@...el.com> wrote:
> Introduce __pfn_t which:
>
> 1/ Allows kernel internal DAX mappings to adhere to the lifetime of the
>    the underlying block device.  In general, it enables a mechanism to
>    allow any device driver to advertise "device memory" (CONFIG_DEV_PFN)
>    to other parts of the kernel.
>
> 2/ Replaces usage of struct page in struct scatterlist.  A scatterlist
>    need only carry enough information to generate a dma address, and
>    removing struct page from scatterlists is a precursor to allowing DMA to
>    device memory.  Some dma mapping implementations are not ready for a
>    scatterlist-pfn to reference unampped device memory, those
>    implementations are disabled by CONFIG_DEV_PFN=y.
>
> Changes since v4 [1]:

v3: https://lists.01.org/pipermail/linux-nvdimm/2015-May/000749.html
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