Re: [ndctl PATCH v2 4/4] ndctl, monitor: support NVDIMM_FAMILY_HYPERV

> From: Dexuan Cui > Sent: Thursday, March 21, 2019 7:09 PM > IMO there are 2 issues in ndctl/monitor.c: filter_dimm(): > > 1. IMO the cmd numbers ND_CMD_SMART (1) and > ND_CMD_SMART_THRESHOLD(2) are not really device-neutral. They > work for ndctl/lib/intel.c and it looks they happen to work for > ndctl/lib/hpe1.c, as hpe "happens" to have: > NDN_HPE1_CMD_SMART = 1, > NDN_HPE1_CMD_SMART_THRESHOLD = 2, > > But for ndctl/lib/msft.c, 1 and 2 mean different things. See [1]. > So the current "ndctl monitor" can't support msft.c. > > For ndctl/lib/hyperv.c, 1 and 2 means: > ND_HYPERV_CMD_GET_HEALTH_INFO = 1, > ND_HYPERV_CMD_GET_SHUTDOWN_INFO = 2, > They're also incompatible with ND_CMD_SMART and > ND_CMD_SMART_THRESHOLD. > Of source, the current code can "work" since these ND_HYPERV_CMD* > numbers happen to be the same as ND_CMD_SMART and > ND_CMD_SMART_THRESHOLD. So this may not be an isue for hyperv.c. Actually, this _is_ an issue for NVDIMM_FAMILY_HYPERV (and the other families except for NVDIMM_FAMILY_INTEL) : see the kernel function acpi_nfit_register_dimms(), where ND_CMD_SMART is set in the "cmd_mask" only for NVDIMM_FAMILY_INTEL. So, on Hyper-V, ndctl_dimm_is_cmd_supported(dimm, ND_CMD_SMART) is always false, and "ndctl monitor" exits with "no smart support".