• Dan Williams's avatar
    libnvdimm: control (ioctl) messages for nvdimm_bus and nvdimm devices · 62232e45
    Dan Williams authored
    Most discovery/configuration of the nvdimm-subsystem is done via sysfs
    attributes.  However, some nvdimm_bus instances, particularly the
    ACPI.NFIT bus, define a small set of messages that can be passed to the
    platform.  For convenience we derive the initial libnvdimm-ioctl command
    formats directly from the NFIT DSM Interface Example formats.
    
        ND_CMD_SMART: media health and diagnostics
        ND_CMD_GET_CONFIG_SIZE: size of the label space
        ND_CMD_GET_CONFIG_DATA: read label space
        ND_CMD_SET_CONFIG_DATA: write label space
        ND_CMD_VENDOR: vendor-specific command passthrough
        ND_CMD_ARS_CAP: report address-range-scrubbing capabilities
        ND_CMD_ARS_START: initiate scrubbing
        ND_CMD_ARS_STATUS: report on scrubbing state
        ND_CMD_SMART_THRESHOLD: configure alarm thresholds for smart events
    
    If a platform later defines different commands than this set it is
    straightforward to extend support to those formats.
    
    Most of the commands target a specific dimm.  However, the
    address-range-scrubbing commands target the bus.  The 'commands'
    attribute in sysfs of an nvdimm_bus, or nvdimm, enumerate the supported
    commands for that object.
    
    Cc: <linux-acpi@vger.kernel.org>
    Cc: Robert Moore <robert.moore@intel.com>
    Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
    Reported-by: default avatarNicholas Moulin <nicholas.w.moulin@linux.intel.com>
    Acked-by: default avatarChristoph Hellwig <hch@lst.de>
    Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
    62232e45
core.c 4.95 KB