From: Dan Williams <dan.j.williams@intel.com>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>, Boaz Harrosh <boaz@plexistor.com>,
david <david@fromorbit.com>,
linux-arch@vger.kernel.org,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Arnd Bergmann <arnd@arndb.de>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
"torvalds@linux-foundation.org" <torvalds@linux-foundation.org>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Christoph Hellwig <hch@lst.de>,
Julia Lawall <Julia.Lawall@lip6.fr>,
Paul Mackerras <paulus@samba.org>,
"H. Peter Anvin" <hpa@zytor.com>, Tejun Heo <tj@kernel.org>,
Matthew Wilcox <willy@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Ross Zwisler <ross.zwisler@linux.intel.com>,
Ingo Molnar <mingo@kernel.org>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>
Subject: Re: [PATCH v4 0/9] introduce __pfn_t, evacuate struct page from sgls
Date: Fri, 5 Jun 2015 14:23:41 -0700 [thread overview]
Message-ID: <CAPcyv4i+qGpb1sDPDUksB9YuFGPtNjqhJbVt5GmSt8mfoZYJkg@mail.gmail.com> (raw)
In-Reply-To: <20150605205052.20751.77149.stgit@dwillia2-desk3.amr.corp.intel.com>
On Fri, Jun 5, 2015 at 2:19 PM, Dan Williams <dan.j.williams@intel.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
WARNING: multiple messages have this Message-ID (diff)
From: Dan Williams <dan.j.williams@intel.com>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>, Boaz Harrosh <boaz@plexistor.com>,
david <david@fromorbit.com>,
linux-arch@vger.kernel.org,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Arnd Bergmann <arnd@arndb.de>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
"torvalds@linux-foundation.org" <torvalds@linux-foundation.org>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Christoph Hellwig <hch@lst.de>,
Julia Lawall <Julia.Lawall@lip6.fr>,
Paul Mackerras <paulus@samba.org>,
"H. Peter Anvin" <hpa@zytor.com>, Tejun Heo <tj@kernel.org>,
Matthew Wilcox <willy@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Ross Zwisler <ross.zwisler@linux.intel.com>,
Ingo Molnar <mingo@kernel.org>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@ml01.01.org>
Subject: Re: [PATCH v4 0/9] introduce __pfn_t, evacuate struct page from sgls
Date: Fri, 5 Jun 2015 14:23:41 -0700 [thread overview]
Message-ID: <CAPcyv4i+qGpb1sDPDUksB9YuFGPtNjqhJbVt5GmSt8mfoZYJkg@mail.gmail.com> (raw)
In-Reply-To: <20150605205052.20751.77149.stgit@dwillia2-desk3.amr.corp.intel.com>
On Fri, Jun 5, 2015 at 2:19 PM, Dan Williams <dan.j.williams@intel.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
next prev parent reply other threads:[~2015-06-05 21:23 UTC|newest]
Thread overview: 59+ 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 ` Dan Williams
2015-06-05 21:19 ` [PATCH v4 1/9] introduce __pfn_t for scatterlists and pmem Dan Williams
2015-06-05 21:19 ` Dan Williams
2015-06-05 21:37 ` Linus Torvalds
2015-06-05 21:37 ` Linus Torvalds
2015-06-05 22:12 ` Dan Williams
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
2015-06-05 21:19 ` Dan Williams
2015-06-09 6:50 ` Christoph Hellwig
2015-06-09 6:50 ` Christoph Hellwig
2015-06-10 12:12 ` Christoph Hellwig
2015-06-10 12:12 ` Christoph Hellwig
2015-06-10 15:03 ` Matthew Wilcox
2015-06-10 15:03 ` Matthew Wilcox
2015-06-10 15:11 ` Christoph Hellwig
2015-06-10 15:11 ` Christoph Hellwig
2015-06-10 15:36 ` Dan Williams
2015-06-10 15:36 ` Dan Williams
2015-06-10 16:11 ` Christoph Hellwig
2015-06-10 16:11 ` Christoph Hellwig
2015-06-10 16:17 ` Dan Williams
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
2015-06-05 21:19 ` Dan Williams
2015-06-06 11:37 ` Matthew Wilcox
2015-06-06 11:37 ` Matthew Wilcox
2015-06-09 6:51 ` Christoph Hellwig
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
2015-06-05 21:19 ` Dan Williams
2015-06-06 11:58 ` Matthew Wilcox
2015-06-06 11:58 ` Matthew Wilcox
2015-08-07 23:54 ` Dan Williams
2015-08-07 23:54 ` Dan Williams
2015-06-08 16:29 ` Elliott, Robert (Server Storage)
2015-06-08 16:29 ` Elliott, Robert (Server Storage)
2015-06-08 16:36 ` Dan Williams
2015-06-08 16:36 ` Dan Williams
2015-06-09 6:55 ` Christoph Hellwig
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 ` Dan Williams
2015-06-05 21:19 ` [PATCH v4 6/9] scatterlist: use sg_phys() Dan Williams
2015-06-05 21:19 ` Dan Williams
2015-06-09 6:59 ` Christoph Hellwig
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 ` Dan Williams
2015-06-05 21:19 ` [PATCH v4 8/9] scatterlist: convert to __pfn_t Dan Williams
2015-06-05 21:19 ` Dan Williams
2015-06-05 21:19 ` [PATCH v4 9/9] x86: convert dma_map_ops to support mapping a __pfn_t Dan Williams
2015-06-05 21:19 ` Dan Williams
2015-06-09 6:58 ` Christoph Hellwig
2015-06-09 6:58 ` Christoph Hellwig
2015-06-09 13:47 ` Konrad Rzeszutek Wilk
2015-06-05 21:23 ` Dan Williams [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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