[ndctl PATCH] ndctl, monitor: support NVDIMM_FAMILY_HYPERV

[Dexuan Cui <decui-0li6OtcxBFHby3iVrkZq2A@public.gmane.org>]

Currently "ndctl monitor" fails for NVDIMM_FAMILY_HYPERV due to
"no smart support".

Actually NVDIMM_FAMILY_HYPERV doesn't use ND_CMD_SMART to get the health
info. Instead, it uses ND_CMD_CALL, so the checking here can't apply,
and NVDIMM_FAMILY_HYPERV doesn't support threshold alarms.

Let's skip the unnecessary checking for NVDIMM_FAMILY_HYPERV.

With the patch, when an error happens, we can log it with such a message:

{"timestamp":"1550209474.683237420","pid":3874,"event":
{"dimm-spares-remaining":false,"dimm-media-temperature":false,
"dimm-controller-temperature":false,"dimm-health-state":true,
"dimm-unclean-shutdown":false},"dimm":{"dev":"nmem1",
"id":"04d5-01-1701-01000000","handle":1,"phys_id":0,"health":
{"health_state":"critical","shutdown_count":8}}}

Here the meaning info is:
"health": {"health_state":"critical","shutdown_count":8}

Signed-off-by: Dexuan Cui <decui-0li6OtcxBFHby3iVrkZq2A@public.gmane.org>
---
 ndctl/lib/libndctl.c   |  5 +++++
 ndctl/lib/libndctl.sym |  1 +
 ndctl/libndctl.h       |  1 +
 ndctl/monitor.c        | 33 ++++++++++++++++++++++++++-------
 4 files changed, 33 insertions(+), 7 deletions(-)

diff --git a/ndctl/lib/libndctl.c b/ndctl/lib/libndctl.c
index 48bdb27..1186579 100644
--- a/ndctl/lib/libndctl.c
+++ b/ndctl/lib/libndctl.c
@@ -1550,6 +1550,11 @@ NDCTL_EXPORT struct ndctl_dimm *ndctl_dimm_get_next(struct ndctl_dimm *dimm)
 	return list_next(&bus->dimms, dimm, list);
 }
 
+NDCTL_EXPORT unsigned long ndctl_dimm_get_cmd_family(struct ndctl_dimm *dimm)
+{
+	return dimm->cmd_family;
+}
+
 NDCTL_EXPORT unsigned int ndctl_dimm_get_handle(struct ndctl_dimm *dimm)
 {
 	return dimm->handle;
diff --git a/ndctl/lib/libndctl.sym b/ndctl/lib/libndctl.sym
index cb9f769..470e895 100644
--- a/ndctl/lib/libndctl.sym
+++ b/ndctl/lib/libndctl.sym
@@ -38,6 +38,7 @@ global:
 	ndctl_bus_wait_probe;
 	ndctl_dimm_get_first;
 	ndctl_dimm_get_next;
+	ndctl_dimm_get_cmd_family;
 	ndctl_dimm_get_handle;
 	ndctl_dimm_get_phys_id;
 	ndctl_dimm_get_vendor;
diff --git a/ndctl/libndctl.h b/ndctl/libndctl.h
index 0debdb6..cb5a8fc 100644
--- a/ndctl/libndctl.h
+++ b/ndctl/libndctl.h
@@ -145,6 +145,7 @@ struct ndctl_dimm *ndctl_dimm_get_next(struct ndctl_dimm *dimm);
         for (dimm = ndctl_dimm_get_first(bus); \
              dimm != NULL; \
              dimm = ndctl_dimm_get_next(dimm))
+unsigned long ndctl_dimm_get_cmd_family(struct ndctl_dimm *dimm);
 unsigned int ndctl_dimm_get_handle(struct ndctl_dimm *dimm);
 unsigned short ndctl_dimm_get_phys_id(struct ndctl_dimm *dimm);
 unsigned short ndctl_dimm_get_vendor(struct ndctl_dimm *dimm);
diff --git a/ndctl/monitor.c b/ndctl/monitor.c
index 43b2abe..6adc305 100644
--- a/ndctl/monitor.c
+++ b/ndctl/monitor.c
@@ -265,31 +265,50 @@ static bool filter_region(struct ndctl_region *region,
 	return true;
 }
 
-static void filter_dimm(struct ndctl_dimm *dimm, struct util_filter_ctx *fctx)
+static bool ndctl_dimm_test_and_enable_notification(struct ndctl_dimm *dimm)
 {
-	struct monitor_dimm *mdimm;
-	struct monitor_filter_arg *mfa = fctx->monitor;
 	const char *name = ndctl_dimm_get_devname(dimm);
 
+	/*
+	 * Hyper-V Virtual NVDIMM doesn't use ND_CMD_SMART to get the health
+	 * info. Instead, it uses ND_CMD_CALL, so the checking here can't
+	 * apply, and it doesn't support threshold alarms.
+	 */
+	if (ndctl_dimm_get_cmd_family(dimm) == NVDIMM_FAMILY_HYPERV)
+		return true;
+
 	if (!ndctl_dimm_is_cmd_supported(dimm, ND_CMD_SMART)) {
 		err(&monitor, "%s: no smart support\n", name);
-		return;
+		return false;
 	}
 	if (!ndctl_dimm_is_cmd_supported(dimm, ND_CMD_SMART_THRESHOLD)) {
 		err(&monitor, "%s: no smart threshold support\n", name);
-		return;
+		return false;
 	}
 
 	if (!ndctl_dimm_is_flag_supported(dimm, ND_SMART_ALARM_VALID)) {
 		err(&monitor, "%s: smart alarm invalid\n", name);
-		return;
+		return false;
 	}
 
 	if (enable_dimm_supported_threshold_alarms(dimm)) {
 		err(&monitor, "%s: enable supported threshold alarms failed\n", name);
-		return;
+		return false;
 	}
 
+	return true;
+}
+
+static void filter_dimm(struct ndctl_dimm *dimm, struct util_filter_ctx *fctx)
+{
+	struct monitor_dimm *mdimm;
+	struct monitor_filter_arg *mfa = fctx->monitor;
+	const char *name = ndctl_dimm_get_devname(dimm);
+
+
+	if (!ndctl_dimm_test_and_enable_notification(dimm))
+		return;
+
 	mdimm = calloc(1, sizeof(struct monitor_dimm));
 	if (!mdimm) {
 		err(&monitor, "%s: calloc for monitor dimm failed\n", name);
-- 
2.19.1