linux-kernel - Re: [PATCH v3 7/7] acpi, nfit: override mask

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Date:   Thu, 29 Jun 2017 14:16:17 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Jerry Hoemann <jerry.hoemann@....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 7/7] acpi, nfit: override mask

On Thu, Jun 29, 2017 at 9:56 AM, Jerry Hoemann <jerry.hoemann@....com> wrote:
> Have module parameter override_dsm_mask override the dsm_mask for
> root calls like it does for non-root dsm calls.
>
> Signed-off-by: Jerry Hoemann <jerry.hoemann@....com>
> ---
>  drivers/acpi/nfit/core.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
> index 7d2f1a0..87acaf2 100644
> --- a/drivers/acpi/nfit/core.c
> +++ b/drivers/acpi/nfit/core.c
> @@ -1627,6 +1627,7 @@ static void acpi_nfit_init_dsms(struct acpi_nfit_desc *acpi_desc)
>         struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
>         const u8 *uuid = to_nfit_uuid(NFIT_DEV_BUS);
>         struct acpi_device *adev;
> +       unsigned long dsm_mask;
>         int i;
>
>         nd_desc->cmd_mask = acpi_desc->bus_cmd_force_en;
> @@ -1638,7 +1639,11 @@ 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++)
> +
> +       dsm_mask = 0x3bf;
> +       if (override_dsm_mask)
> +               dsm_mask = override_dsm_mask;
> +       for_each_set_bit(i, &dsm_mask, BITS_PER_LONG)
>                 if (acpi_check_dsm(adev->handle, uuid, 1, 1ULL << i))
>                         set_bit(i, &nd_desc->bus_dsm_mask);
>  }

I don't think we need this patch. 'override_dsm_mask' is there to make
it easier for vendor-specific DSM testing and debug for DIMM-level
DSMs. The root bus is not vendor specific and the command set is not
evolving at the same rate we are seeing change at DIMM-level DSMs.