linux-kernel - Re: [PATCH 3/3] libnvdimm: New ACPI 6.2 DSM functions

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Date:   Fri, 9 Jun 2017 10:59:31 -0600
From:   Jerry Hoemann <jerry.hoemann@....com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Johannes Thumshirn <jthumshirn@...e.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>
Subject: Re: [PATCH 3/3] libnvdimm: New ACPI 6.2 DSM functions

On Thu, Jun 08, 2017 at 10:28:51PM -0700, Dan Williams wrote:
> On Thu, Jun 8, 2017 at 1:02 AM, Johannes Thumshirn <jthumshirn@...e.de> wrote:
> > On 06/07/2017 07:04 PM, Jerry Hoemann wrote:
> >> @@ -179,6 +217,10 @@ static inline const char *nvdimm_bus_cmd_name(unsigned cmd)
> >>               [ND_CMD_ARS_START] = "ars_start",
> >>               [ND_CMD_ARS_STATUS] = "ars_status",
> >>               [ND_CMD_CLEAR_ERROR] = "clear_error",
> >> +             [5] = "trans_spa",
> >> +             [7] = "ars_err_inj",
> >> +             [8] = "ars_err_inj_clr",
> >> +             [9] = "ars_err_inj_stat",
> >>               [ND_CMD_CALL] = "cmd_call",
> >>       };
> >
> > Can you please add the new values to the enum in uapi/ndctl.h? I don't
> > really like the magic numbers here.
> 
> I think the reason Jerry didn't add them is due to symmetry. All the
> current ND_CMD_ definitions have corresponding ND_IOCTL_ definitions.
> These new commands we're only adding function number support and using
> ND_CMD_CALL for the ioctl transport.

  Yes, this is correct.

> 					We can still add definitions for
> them, but perhaps with an ACPI_NFIT_DSM_ prefix? The only consumer in
> the kernel of this is debug output code. I think perhaps we should
> just delete them here and either print raw numbers or enable
> acpi_nfit_ctl() to the decode and not rely on nvdimm_bus_cmd_name()
> which is meant to represent NVDIMM bus type generic command numbers.

This also comes into play when doing:

	cat /sys/class/nd/ndctl0/device/nd/ndctl0/device/commands

Without change here the new functions would show up as "unknown unknown unknown unknown."

Dan, are you suggesting I change the above to:

               [ND_CMD_CLEAR_ERROR] = "clear_error",
 +             [5] = "5",
 +             [7] = "7",
 +             [8] = "8",
 +             [9] = "9",
               [ND_CMD_CALL] = "cmd_call",

Note, "6" is currently reserved by ACPI.  I could add that also.



-- 

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Jerry Hoemann                  Software Engineer   Hewlett Packard Enterprise
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