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

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Date:	Fri, 24 Apr 2015 09:56:31 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	linux-nvdimm@...ts.01.org, linux-acpi@...r.kernel.org,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Robert Moore <robert.moore@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [Linux-nvdimm] [PATCH 08/21] nd: ndctl.h, the nd ioctl abi

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.

Thanks,
-Toshi

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