linux-kernel - Re: [PATCH] nfit: add Microsoft NVDIMM DSM command set to white list

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Message-ID: <790a33bd-98e9-89c8-6667-e135ada69f80@gmail.com>
Date:	Wed, 8 Jun 2016 16:47:54 -0500
From:	Stuart Hayes <stuart.w.hayes@...il.com>
To:	linux-nvdimm@...ts.01.org, dan.j.williams@...el.com
Cc:	ross.zwisler@...ux.intel.com, rjw@...ysocki.net,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nfit: add Microsoft NVDIMM DSM command set to white list



On 5/26/2016 11:38 AM, Stuart Hayes wrote:
> Add the Microsoft _DSM command set to the white list of NVDIMM command sets.
>
> This command set is documented at https://msdn.microsoft.com/library/windows/hardware/mt604741.
>
> Signed-off-by: Stuart Hayes <stuart.w.hayes@...il.com>
> ---
>  drivers/acpi/nfit.c        | 9 ++++++---
>  drivers/acpi/nfit.h        | 4 ++++
>  include/uapi/linux/ndctl.h | 1 +
>  3 files changed, 11 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
> index 2215fc8..48fc575 100644
> --- a/drivers/acpi/nfit.c
> +++ b/drivers/acpi/nfit.c
> @@ -1130,11 +1130,11 @@ static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
>      }
>
>      /*
> -     * Until standardization materializes we need to consider up to 3
> +     * Until standardization materializes we need to consider several
>       * different command sets.  Note, that checking for function0 (bit0)
>       * tells us if any commands are reachable through this uuid.
>       */
> -    for (i = NVDIMM_FAMILY_INTEL; i <= NVDIMM_FAMILY_HPE2; i++)
> +    for (i = NVDIMM_FAMILY_INTEL; i <= NVDIMM_FAMILY_MSFT; i++)
>          if (acpi_check_dsm(adev_dimm->handle, to_nfit_uuid(i), 1, 1))
>              break;
>
> @@ -1150,7 +1150,9 @@ static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
>          dsm_mask = 0x1fe;
>          if (disable_vendor_specific)
>              dsm_mask &= ~(1 << 8);
> -    } else {
> +    } else if (nfit_mem->family == NVDIMM_FAMILY_MSFT)
> +        dsm_mask = 0xffffffff;
> +    else {
>          dev_err(dev, "unknown dimm command family\n");
>          nfit_mem->family = -1;
>          return force_enable_dimms ? 0 : -ENODEV;
> @@ -2692,6 +2694,7 @@ static __init int nfit_init(void)
>      acpi_str_to_uuid(UUID_NFIT_DIMM, nfit_uuid[NFIT_DEV_DIMM]);
>      acpi_str_to_uuid(UUID_NFIT_DIMM_N_HPE1, nfit_uuid[NFIT_DEV_DIMM_N_HPE1]);
>      acpi_str_to_uuid(UUID_NFIT_DIMM_N_HPE2, nfit_uuid[NFIT_DEV_DIMM_N_HPE2]);
> +    acpi_str_to_uuid(UUID_NFIT_DIMM_N_MSFT, nfit_uuid[NFIT_DEV_DIMM_N_MSFT]);
>
>      nfit_wq = create_singlethread_workqueue("nfit");
>      if (!nfit_wq)
> diff --git a/drivers/acpi/nfit.h b/drivers/acpi/nfit.h
> index 11cb383..f06fa91 100644
> --- a/drivers/acpi/nfit.h
> +++ b/drivers/acpi/nfit.h
> @@ -31,6 +31,9 @@
>  #define UUID_NFIT_DIMM_N_HPE1 "9002c334-acf3-4c0e-9642-a235f0d53bc6"
>  #define UUID_NFIT_DIMM_N_HPE2 "5008664b-b758-41a0-a03c-27c2f2d04f7e"
>
> +/* https://msdn.microsoft.com/library/windows/hardware/mt604741 */
> +#define UUID_NFIT_DIMM_N_MSFT "1ee68b36-d4bd-4a1a-9a16-4f8e53d46e05"
> +
>  #define ACPI_NFIT_MEM_FAILED_MASK (ACPI_NFIT_MEM_SAVE_FAILED \
>          | ACPI_NFIT_MEM_RESTORE_FAILED | ACPI_NFIT_MEM_FLUSH_FAILED \
>          | ACPI_NFIT_MEM_NOT_ARMED)
> @@ -40,6 +43,7 @@ enum nfit_uuids {
>      NFIT_DEV_DIMM = NVDIMM_FAMILY_INTEL,
>      NFIT_DEV_DIMM_N_HPE1 = NVDIMM_FAMILY_HPE1,
>      NFIT_DEV_DIMM_N_HPE2 = NVDIMM_FAMILY_HPE2,
> +    NFIT_DEV_DIMM_N_MSFT = NVDIMM_FAMILY_MSFT,
>      NFIT_SPA_VOLATILE,
>      NFIT_SPA_PM,
>      NFIT_SPA_DCR,
> diff --git a/include/uapi/linux/ndctl.h b/include/uapi/linux/ndctl.h
> index 309915f..ba5a8c7 100644
> --- a/include/uapi/linux/ndctl.h
> +++ b/include/uapi/linux/ndctl.h
> @@ -298,6 +298,7 @@ struct nd_cmd_pkg {
>  #define NVDIMM_FAMILY_INTEL 0
>  #define NVDIMM_FAMILY_HPE1 1
>  #define NVDIMM_FAMILY_HPE2 2
> +#define NVDIMM_FAMILY_MSFT 3
>
>  #define ND_IOCTL_CALL            _IOWR(ND_IOCTL, ND_CMD_CALL,\
>                      struct nd_cmd_pkg)

Is there a problem with this patch?  I never saw any responses, and wasn't sure if maybe I goofed.  Thanks!