linux-kernel - Re: [PATCH v3 4/7] acpi, nfit: Use bus_dsm

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Date:   Thu, 29 Jun 2017 15:47:35 -0600
From:   Jerry Hoemann <jerry.hoemann@....com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 4/7] acpi, nfit: Use bus_dsm_mask for passthru

On Thu, Jun 29, 2017 at 02:35:14PM -0700, Dan Williams wrote:
> On Thu, Jun 29, 2017 at 9:56 AM, Jerry Hoemann <jerry.hoemann@....com> wrote:
> > Populate bus_dsm_mask and use it to filter dsm calls that user can
> > make through the pass thru interface.
> >
> > Signed-off-by: Jerry Hoemann <jerry.hoemann@....com>
> > ---
> >  drivers/acpi/nfit/core.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
> > index b46fca2..971002b 100644
> > --- a/drivers/acpi/nfit/core.c
> > +++ b/drivers/acpi/nfit/core.c
> > @@ -253,6 +253,8 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
> >                 cmd_name = nvdimm_bus_cmd_name(cmd);
> >                 cmd_mask = nd_desc->cmd_mask;
> >                 dsm_mask = cmd_mask;
> > +               if (cmd == ND_CMD_CALL)
> > +                       dsm_mask = nd_desc->bus_dsm_mask;
> >                 desc = nd_cmd_bus_desc(cmd);
> >                 uuid = to_nfit_uuid(NFIT_DEV_BUS);
> >                 handle = adev->handle;
> > @@ -1624,6 +1626,9 @@ static void acpi_nfit_init_dsms(struct acpi_nfit_desc *acpi_desc)
> >                 if (acpi_check_dsm(adev->handle, uuid, 1, 1ULL << i))
> >                         set_bit(i, &nd_desc->cmd_mask);
> >         set_bit(ND_CMD_CALL, &nd_desc->cmd_mask);
> > +       for (i = 0; i < ND_CMD_CALL; i++)
> > +               if (acpi_check_dsm(adev->handle, uuid, 1, 1ULL << i))
> > +                       set_bit(i, &nd_desc->bus_dsm_mask);
> >  }
> 
> This loop checks for function 6 which is specified as reserved. Lets
> explicitly test for the known good function numbers with something
> like this:
> 
> /* this should be private in drivers/acpi/nfit/nfit.h */
> enum nfit_aux_cmds {
>         NFIT_CMD_TRANSLATE_SPA = 5,
>         NFIT_CMD_ARS_INJECT_SET = 7,
>         NFIT_CMD_ARS_INJECT_CLEAR = 8,
>         NFIT_CMD_ARS_INJECT_GET = 9,
> };
> 
> bus_dsm_mask =
>         (1 << ND_CMD_ARS_CAP) |
>         (1 << ND_CMD_ARS_START) |
>         (1 << ND_CMD_ARS_STATUS) |
>         (1 << ND_CMD_CLEAR_ERROR) |
>         (1 << NFIT_CMD_TRANSLATE_SPA) |
>         (1 << NFIT_CMD_ARS_INJECT_SET) |
>         (1 << NFIT_CMD_ARS_INJECT_CLEAR) |
>         (1 << NFIT_CMD_ARS_INJECT_GET);
> 
> for_each_set_bit(i, &bus_dsm_mask...


  I added the for_each_set_bit check in patch 7 of the series.


-- 

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Jerry Hoemann                  Software Engineer   Hewlett Packard Enterprise
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