linux-kernel - Re: [PATCH v6 19/21] libnvdimm, nfit, nd_blk: driver for BLK-mode access persistent memory

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Date:	Thu, 18 Jun 2015 00:09:14 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	linux-nvdimm@...ts.01.org, axboe@...nel.dk,
	Boaz Harrosh <boaz@...xistor.com>, akpm@...ux-foundation.org,
	sfr@...b.auug.org.au, neilb@...e.de, gregkh@...uxfoundation.org,
	rafael@...nel.org, linux-kernel@...r.kernel.org,
	Andy Lutomirski <luto@...capital.net>,
	Jens Axboe <axboe@...com>, linux-acpi@...r.kernel.org,
	jmoyer@...hat.com, "H. Peter Anvin" <hpa@...or.com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	linux-api@...r.kernel.org, hch@....de, mingo@...nel.org
Subject: Re: [PATCH v6 19/21] libnvdimm, nfit, nd_blk: driver for BLK-mode access persistent memory

On Thursday, June 11, 2015 04:11:53 PM Dan Williams wrote:
> From: Ross Zwisler <ross.zwisler@...ux.intel.com>
> 
> The libnvdimm implementation handles allocating dimm address space (DPA)
> between PMEM and BLK mode interfaces.  After DPA has been allocated from
> a BLK-region to a BLK-namespace the nd_blk driver attaches to handle I/O
> as a struct bio based block device. Unlike PMEM, BLK is required to
> handle platform specific details like mmio register formats and memory
> controller interleave.  For this reason the libnvdimm generic nd_blk
> driver calls back into the bus provider to carry out the I/O.
> 
> This initial implementation handles the BLK interface defined by the
> ACPI 6 NFIT [1] and the NVDIMM DSM Interface Example [2] composed from
> DCR (dimm control region), BDW (block data window), IDT (interleave
> descriptor) NFIT structures and the hardware register format.
> [1]: http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf
> [2]: http://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf
> 
> Cc: Andy Lutomirski <luto@...capital.net>
> Cc: Boaz Harrosh <boaz@...xistor.com>
> Cc: H. Peter Anvin <hpa@...or.com>
> Cc: Jens Axboe <axboe@...com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Christoph Hellwig <hch@....de>
> Signed-off-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>

For the ACPI part:

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

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