[ndctl PATCH 4/8] libndctl: Add support for parsing of_pmem dimm flags and monitor mode

[Vaibhav Jain <vaibhav@linux.ibm.com>]

Add support for parsing the dimm flags for of_pmem supporting
dimms. The flag file is exported in sysfs as 'papr_flags' and its
contents are space separated flags indicating the current state of the
dimm. A newly introduced function parse_of_pmem_flags() reads the contents
of this flag file and sets appropriate flag bits in 'struct
ndctl_dimm.flags'. This function is called at the end of of_pmem probe
function add_of_pmem_dimm().

Also we advertise support for monitor mode by allocating a file
descriptor to the 'papr_flags' file and assigning it to 'struct
ndctl_dimm.health_event_fd'.

Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
---
 ndctl/lib/libndctl.c | 33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/ndctl/lib/libndctl.c b/ndctl/lib/libndctl.c
index 650406d27512..7cc50afac404 100644
--- a/ndctl/lib/libndctl.c
+++ b/ndctl/lib/libndctl.c
@@ -801,6 +801,28 @@ static void parse_nfit_mem_flags(struct ndctl_dimm *dimm, char *flags)
 				ndctl_dimm_get_devname(dimm), flags);
 }
 
+static void parse_of_pmem_flags(struct ndctl_dimm *dimm, char *flags)
+{
+	char *start, *end;
+
+	start = flags;
+	while ((end = strchr(start, ' '))) {
+		*end = '\0';
+		if (strcmp(start, "not_armed") == 0)
+			dimm->flags.f_arm = 1;
+		else if (strcmp(start, "save_fail") == 0)
+			dimm->flags.f_save = 1;
+		else if (strcmp(start, "flush_fail") == 0)
+			dimm->flags.f_flush = 1;
+		else if (strcmp(start, "smart_notify") == 0)
+			dimm->flags.f_notify = 1;
+		start = end + 1;
+	}
+	if (end != start)
+		dbg(ndctl_dimm_get_ctx(dimm), "%s: %s\n",
+				ndctl_dimm_get_devname(dimm), flags);
+}
+
 static void parse_dimm_flags(struct ndctl_dimm *dimm, char *flags)
 {
 	char *start, *end;
@@ -1436,8 +1458,17 @@ static int add_of_pmem_dimm(struct ndctl_dimm *dimm, const char *dimm_base)
 	if (strcmp(buf, "ibm,pmemory") == 0) {
 		dimm->cmd_family = NVDIMM_FAMILY_PAPR_SCM;
 		rc = 0;
-		goto out;
+		goto out_monitor;
 	}
+
+out_monitor:
+	/* read the flags and also allocate the monitor mode event_fd */
+	sprintf(path, "%s/papr_flags", dimm_base);
+	if (sysfs_read_attr(ctx, path, buf) == 0)
+		parse_of_pmem_flags(dimm, buf);
+
+	/* Allocate monitor mode fd */
+	dimm->health_eventfd = open(path, O_RDONLY|O_CLOEXEC);
 out:
 	free(path);
 	return rc;
-- 
2.24.1
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