linux-kernel - Re: [Linux-nvdimm] [PATCH 08/21] nd: ndctl.h, the nd ioctl abi

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Message-ID: <1429891777.16996.58.camel@misato.fc.hp.com>
Date:	Fri, 24 Apr 2015 10:09:37 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	linux-acpi@...r.kernel.org,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Robert Moore <robert.moore@...el.com>,
	linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org
Subject: Re: [Linux-nvdimm] [PATCH 08/21] nd: ndctl.h, the nd ioctl abi

On Fri, 2015-04-24 at 09:56 -0600, Toshi Kani wrote:
> On Fri, 2015-04-17 at 21:35 -0400, Dan Williams wrote:
> > Most configuration of the nd-subsystem is done via nd-sysfs.  However,
> > the NFIT specification defines a small set of messages that can be
> > passed to the subsystem via platform-firmware-defined methods.  The
> > command set (as of the current version of the NFIT-DSM spec) is:
> > 
> >     NFIT_CMD_SMART: media health and diagnostics
> >     NFIT_CMD_GET_CONFIG_SIZE: size of the label space
> >     NFIT_CMD_GET_CONFIG_DATA: read label
> >     NFIT_CMD_SET_CONFIG_DATA: write label
> >     NFIT_CMD_VENDOR: vendor-specific command passthrough
> >     NFIT_CMD_ARS_CAP: report address-range-scrubbing capabilities
> >     NFIT_CMD_START_ARS: initiate scrubbing
> >     NFIT_CMD_QUERY_ARS: report on scrubbing state
> >     NFIT_CMD_SMART_THRESHOLD: configure alarm thresholds for smart events
> 
> "nd/bus.c" provides two features, 1) the top level ND bus driver which
> is the central part of the ND, and 2) the ioctl interface specific to
> the example-DSM-interface.  I think the example-DSM-specific part should
> be put into an example-DSM-support module, so that the ND can support
> other _DSMs as necessary.  Also, _DSM needs to be handled as optional.

And the same for "nd/acpi.c", which is 1) the ACPI0012 handler, and 2)
the example-DSM-support module.  I think they need to be separated.  

Thanks,
-Toshi 

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