Provide the ability to request a default DSM family. If it is not supported, then fall back to the normal discovery order.
This is helpful for testing platforms that support multiple DSM families. It will also allow administrators to request the DSM family that their management tools support, which may not be the first one found using the current discovery order. Signed-off-by: Linda Knippers <[email protected]> --- drivers/acpi/nfit/core.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index 97d42ff..0564cd6 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -55,6 +55,11 @@ module_param(override_dsm_mask, ulong, S_IRUGO); MODULE_PARM_DESC(override_dsm_mask, "Bitmask of allowed NVDIMM DSM functions"); +static int default_dsm_family = -1; +module_param(default_dsm_family, int, S_IRUGO); +MODULE_PARM_DESC(default_dsm_family, + "Try this DSM type first when identifying NVDIMM family"); + LIST_HEAD(acpi_descs); DEFINE_MUTEX(acpi_desc_lock); @@ -1372,6 +1377,7 @@ static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc, unsigned long dsm_mask; const u8 *uuid; int i; + int family = -1; /* nfit test assumes 1:1 relationship between commands and dsms */ nfit_mem->dsm_mask = acpi_desc->dimm_cmd_force_en; @@ -1402,10 +1408,11 @@ static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc, */ for (i = NVDIMM_FAMILY_INTEL; i <= NVDIMM_FAMILY_MSFT; i++) if (acpi_check_dsm(adev_dimm->handle, to_nfit_uuid(i), 1, 1)) - break; + if (family < 0 || i == default_dsm_family) + family = i; /* limit the supported commands to those that are publicly documented */ - nfit_mem->family = i; + nfit_mem->family = family; if (override_dsm_mask && !disable_vendor_specific) dsm_mask = override_dsm_mask; else if (nfit_mem->family == NVDIMM_FAMILY_INTEL) { -- 1.8.3.1 _______________________________________________ Linux-nvdimm mailing list [email protected] https://lists.01.org/mailman/listinfo/linux-nvdimm
