linux-kernel - Re: [PATCH v5 05/21] libnvdimm: control (ioctl) messages for libnvdimm bus and dimm devices

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Date:	Wed, 10 Jun 2015 09:33:16 +0200
From:	Christoph Hellwig <hch@....de>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Christoph Hellwig <hch@....de>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	Jens Axboe <axboe@...nel.dk>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Neil Brown <neilb@...e.de>,
	Greg KH <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	jmoyer <jmoyer@...hat.com>, linux-api@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v5 05/21] libnvdimm: control (ioctl) messages for
	libnvdimm bus and dimm devices

On Mon, Jun 08, 2015 at 11:57:42PM -0700, Dan Williams wrote:
> Data payload size for one, these commands transfer more than a page
> worth of data at a time.
> 
> Even if we killed the ioctl interface to userspace we still need all
> the ugly data marshaling code in the kernel to craft properly
> formatted ACPI _DSM messages.  I try to share as much common
> infrastructure from the ACPI _DSM implementation to the ioctl
> interface (nd_cmd_dimm_desc() + nd_cmd_bus_desc()).

Ok.  Not a fan of these dual interfaces but in this case they might be
justified.
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