linux-kernel - RE: [PATCH v2 2/2] acpi/nfit: Issue Start ARS to retrieve existing records

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Date:   Sat, 17 Jun 2017 00:47:03 +0000
From:   "Kani, Toshimitsu" <toshi.kani@....com>
To:     Dan Williams <dan.j.williams@...el.com>
CC:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        "Verma, Vishal L" <vishal.l.verma@...el.com>,
        "Knippers, Linda" <linda.knippers@....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>
Subject: RE: [PATCH v2 2/2] acpi/nfit: Issue Start ARS to retrieve existing
 records

> On Fri, Jun 16, 2017 at 5:01 PM, Kani, Toshimitsu <toshi.kani@....com> wrote:
> >> > --- a/drivers/acpi/nfit/core.c
> >> > +++ b/drivers/acpi/nfit/core.c
> >> > @@ -1031,7 +1031,7 @@ static ssize_t scrub_store(struct device *dev,
> >> >         if (nd_desc) {
> >> >                 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
> >> >
> >> > -               rc = acpi_nfit_ars_rescan(acpi_desc);
> >> > +               rc = acpi_nfit_ars_rescan(acpi_desc, 0);
> >> >         }
> >> >         device_unlock(dev);
> >> >         if (rc)
> >> > @@ -2057,6 +2057,10 @@ static int ars_start(struct acpi_nfit_desc
> >> *acpi_desc, struct nfit_spa *nfit_spa
> >> >                 ars_start.type = ND_ARS_VOLATILE;
> >> >         else
> >> >                 return -ENOTTY;
> >> > +       if (nfit_spa->ars_prev_data) {
> >> > +               ars_start.flags |= ND_ARS_RETURN_PREV_DATA;
> >> > +               nfit_spa->ars_prev_data = 0;
> >> > +       }
> >>
> >> I'd rather you plumb a new 'flags' parameter all the way through from
> >> acpi_nfit_ars_rescan() to ars_start() rather than carrying this as a
> >> property of nfit_spa.
> >
> > Yes, I wanted to carry 'flags' all the way, but since acpi_nfit_ars_rescan()
> > calls acpi_nfit_scrub() via acpi_desc->work, all info needs to be marshalled
> > into struct acpi_nfit_desc.  Using nfit_spa allows a request to be carried as
> > per-spa basis...
> 
> Ah ok, but I still think it does not belong to a spa. This is control
> / context information for the workqueue and that belongs with
> acpi_nfit_desc. It think it's fine if all spas get re-scrubbed with
> the "prev_data" flag in the the notification case.

Sounds good.  I will add the flags info to acpi_nfit_desc and update
this patch.

Thanks!
-Toshi