linux-kernel - Re: [PATCH] nfit: Collect shutdown status for NVDIMM_FAMILY

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Message-ID: <CAPcyv4g_dmR77ofqCR3Zy_V2inD_0WTgLLJOqTcB6=SSZZjp8w@mail.gmail.com>
Date:   Wed, 30 Jan 2019 10:57:30 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Dexuan Cui <decui@...rosoft.com>
Cc:     Ross Zwisler <zwisler@...nel.org>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        Josh Poulson <jopoulso@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "driverdev-devel@...uxdriverproject.org" 
        <driverdev-devel@...uxdriverproject.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>
Subject: Re: [PATCH] nfit: Collect shutdown status for NVDIMM_FAMILY_HYPERV

On Wed, Jan 30, 2019 at 10:49 AM Dexuan Cui <decui@...rosoft.com> wrote:
>
>
> See http://www.uefi.org/RFIC_LIST ("Virtual NVDIMM 0x1901"):
> "Get Unsafe Shutdown Count (Function Index 2)".
>
> Let's expose the info to the userspace (e.g. ntctl) via sysfs.
>
> Signed-off-by: Dexuan Cui <decui@...rosoft.com>
> ---
>  drivers/acpi/nfit/core.c   | 51 ++++++++++++++++++++++++++++++++++++++
>  drivers/acpi/nfit/hyperv.h | 26 +++++++++++++++++++
>  2 files changed, 77 insertions(+)
>  create mode 100644 drivers/acpi/nfit/hyperv.h

Looks ok to me, but if we grow any more of these "shutdown count"
retrievals I'll want to take a look at being able to call
acpi_nfit_ctl() earlier in the init process so that this data
marshaling can be unified.