linux-kernel - Re: [PATCH 1/4] nvdimm: Add wrapper for IOCTL pass thru.

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Date:	Tue, 10 Nov 2015 12:51:59 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Jerry Hoemann <jerry.hoemann@....com>
Cc:	ross.zwisler@...ux.intel.com, rjw@...ysocki.net, lenb@...nel.org,
	dan.j.williams@...el.com, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-nvdimm@...1.01.org
Subject: Re: [PATCH 1/4] nvdimm: Add wrapper for IOCTL pass thru.

Jerry Hoemann <jerry.hoemann@....com> writes:

> Add IOCTL type 'P' to denote NVDIMM_TYPE_PASSTHRU.

Can't you just make passthrough a separate command?  If you actually add
the ioctl definition for passthrough (which you didn't do for some
reason?), it looks odd:

#define ND_IOCTL_PASSTHRU        _IOWR(NVDIMM_TYPE_PASSTHRU,, ND_CMD_PASSTHRU, \
                                 struct ndn_package)

Care to comment on why you chose a different type instead of specifying
a new command?

> +struct ndn_pkg {
> +	struct {
> +		__u8	dsm_uuid[16];
> +		__u32	dsm_in;			/* size of _DSM input    */
> +		__u32	dsm_out;		/* size of user buffer   */
> +		__u32	dsm_rev;		/* revision of dsm call  */
> +		__u32	res[8];			/* reserved must be zero */
> +		__u32	dsm_size;		/* size _DSM would write */
> +	} h;
> +	unsigned char buf[];

Please change that to:
	__u8 *buf;
since acpi_object.buffer.pointer is a u8 *.

Note that the size of this structure will be different for 32 vs. 64
bit, but I don't think it matters since offsets won't change (the
pointer is at the end of the structure).
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