linux-kernel - Re: [PATCH 1/2]: nfit: Clarify memory device state flags strings

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Message-ID: <CAPcyv4hNdyDSirnbxw9uMWZXPVhzGSznEDT0GEMD8do2go6i7Q@mail.gmail.com>
Date:	Thu, 27 Aug 2015 11:57:28 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Toshi Kani <toshi.kani@...com>
Cc:	Rafael J Wysocki <rafael.j.wysocki@...el.com>,
	Robert Moore <robert.moore@...el.com>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Elliott, Robert (Server Storage)" <elliott@...com>
Subject: Re: [PATCH 1/2]: nfit: Clarify memory device state flags strings

On Wed, Aug 26, 2015 at 9:20 AM, Toshi Kani <toshi.kani@...com> wrote:
> ACPI 6.0 NFIT Memory Device State Flags in Table 5-129 defines
> NVDIMM status as follows.  These bits indicate multiple info,
> such as failures, pending event, and capability.
>
>   Bit [0] set to 1 to indicate that the previous SAVE to the
>   Memory Device failed.
>   Bit [1] set to 1 to indicate that the last RESTORE from the
>   Memory Device failed.
>   Bit [2] set to 1 to indicate that platform flush of data to
>   Memory Device failed. As a result, the restored data content
>   may be inconsistent even if SAVE and RESTORE do not indicate
>   failure.
>   Bit [3] set to 1 to indicate that the Memory Device is observed
>   to be not armed prior to OSPM hand off. A Memory Device is
>   considered armed if it is able to accept persistent writes.
>   Bit [4] set to 1 to indicate that the Memory Device observed
>   SMART and health events prior to OSPM handoff.
>   Bit [5] is set to 1 to indicate that platform firmware is
>   enabled to notify OSPM on SMART and health events related to
>   the memory device using Notify codes as specified in Section
>   5.6.6.
>
> /sys/bus/nd/devices/nmemX/nfit/flags shows this flags info.
> The output strings associated with the bits are "save", "restore",
> "smart", etc., which can be confusing as they may be interpreted
> as positive status, i.e. save succeeded.
>
> Change the strings to be more descriptive per the ACPI spec.
> Also add a string to bit 5 for completeness.

Ok I'm going to push this upstream for 4.2 with the "not_armed" fixup
that Ross suggested, but I'll defer adding bit5 since that is separate
from the urgent fix to get the polarities properly reflected and we
can add support for it later.
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