libndctl/papr: Add support for reporting shutdown-count

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Brew: 

commit aa990008f48f21121474a411d829f24e832c89a2

Author: Vaibhav Jain <vaibhav@linux.ibm.com>

Date:   Tue Jan 25 00:26:05 2022 +0530

    libndctl/papr: Add support for reporting shutdown-count

    Add support for reporting dirty-shutdown-count (DSC) for PAPR based

    NVDIMMs. The sysfs attribute exposing this value is located at

    nmemX/papr/dirty_shutdown.

    This counter is also returned in payload for PAPR_PDSM_HEALTH as newly

    introduced member 'dimm_dsc' in 'struct nd_papr_pdsm_health'. Presence

    of 'DSC' is indicated by the PDSM_DIMM_DSC_VALID extension flag.

    The patch implements 'ndctl_dimm_ops.smart_get_shutdown_count'

    callback in implemented as papr_smart_get_shutdown_count().

    Kernel side changes to support reporting DSC have been merged to linux kernel

    via patch proposed at [1]. With updated kernel 'ndctl list -DH' reports

    following output on PPC64:

    $ sudo ndctl list -DH

    [

      {

        "dev":"nmem0",

        "health":{

          "health_state":"ok",

          "life_used_percentage":50,

          "shutdown_state":"clean",

          "shutdown_count":10

        }

      }

    ]

    [1] http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20210624080621.252038-1-vaibhav@linux.ibm.com

    Link: https://lore.kernel.org/r/20220124185605.1465681-1-vaibhav@linux.ibm.com

    Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>

    Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>

diff --git a/ndctl/lib/libndctl.c b/ndctl/lib/libndctl.c

index 47a234c..5979a92 100644

--- a/ndctl/lib/libndctl.c

+++ b/ndctl/lib/libndctl.c

@@ -1819,8 +1819,12 @@ static int add_papr_dimm(struct ndctl_dimm *dimm, const char *dimm_base)

 		/* Allocate monitor mode fd */

 		dimm->health_eventfd = open(path, O_RDONLY|O_CLOEXEC);

-		rc = 0;

+		/* Get the dirty shutdown counter value */

+		sprintf(path, "%s/papr/dirty_shutdown", dimm_base);

+		if (sysfs_read_attr(ctx, path, buf) == 0)

+			dimm->dirty_shutdown = strtoll(buf, NULL, 0);

+		rc = 0;

 	} else if (strcmp(buf, "nvdimm_test") == 0) {

 		/* probe via common populate_dimm_attributes() */

 		rc = populate_dimm_attributes(dimm, dimm_base, "papr");

diff --git a/ndctl/lib/papr.c b/ndctl/lib/papr.c

index 43b8412..46cf9c1 100644

--- a/ndctl/lib/papr.c

+++ b/ndctl/lib/papr.c

@@ -165,6 +165,9 @@ static unsigned int papr_smart_get_flags(struct ndctl_cmd *cmd)

 		if (health.extension_flags & PDSM_DIMM_HEALTH_RUN_GAUGE_VALID)

 			flags |= ND_SMART_USED_VALID;

+		if (health.extension_flags &  PDSM_DIMM_DSC_VALID)

+			flags |= ND_SMART_SHUTDOWN_COUNT_VALID;

+

 		return flags;

 	}

@@ -236,6 +239,25 @@ static unsigned int papr_smart_get_life_used(struct ndctl_cmd *cmd)

 		(100 - health.dimm_fuel_gauge) : 0;

 }

+static unsigned int papr_smart_get_shutdown_count(struct ndctl_cmd *cmd)

+{

+

+	struct nd_papr_pdsm_health health;

+

+	/* Ignore in case of error or invalid pdsm */

+	if (!cmd_is_valid(cmd) ||

+	    to_pdsm(cmd)->cmd_status != 0 ||

+	    to_pdsm_cmd(cmd) != PAPR_PDSM_HEALTH)

+		return 0;

+

+	/* get the payload from command */

+	health = to_payload(cmd)->health;

+

+	return (health.extension_flags & PDSM_DIMM_DSC_VALID) ?

+		(health.dimm_dsc) : 0;

+

+}

+

 struct ndctl_dimm_ops * const papr_dimm_ops = &(struct ndctl_dimm_ops) {

 	.cmd_is_supported = papr_cmd_is_supported,

 	.smart_get_flags = papr_smart_get_flags,

@@ -245,4 +267,5 @@ struct ndctl_dimm_ops * const papr_dimm_ops = &(struct ndctl_dimm_ops) {

 	.smart_get_health = papr_smart_get_health,

 	.smart_get_shutdown_state = papr_smart_get_shutdown_state,

 	.smart_get_life_used = papr_smart_get_life_used,

+	.smart_get_shutdown_count = papr_smart_get_shutdown_count,

 };

diff --git a/ndctl/lib/papr_pdsm.h b/ndctl/lib/papr_pdsm.h

index 1bac8a7..f45b1e4 100644

--- a/ndctl/lib/papr_pdsm.h

+++ b/ndctl/lib/papr_pdsm.h

@@ -75,6 +75,9 @@

 /* Indicate that the 'dimm_fuel_gauge' field is valid */

 #define PDSM_DIMM_HEALTH_RUN_GAUGE_VALID 1

+/* Indicate that the 'dimm_dsc' field is valid */

+#define PDSM_DIMM_DSC_VALID 2

+

 /*

  * Struct exchanged between kernel & ndctl in for PAPR_PDSM_HEALTH

  * Various flags indicate the health status of the dimm.

@@ -103,6 +106,9 @@ struct nd_papr_pdsm_health {

 			/* Extension flag PDSM_DIMM_HEALTH_RUN_GAUGE_VALID */

 			__u16 dimm_fuel_gauge;

+

+			/* Extension flag PDSM_DIMM_DSC_VALID */

+			__u64 dimm_dsc;

 		};

 		__u8 buf[ND_PDSM_PAYLOAD_MAX_SIZE];

 	};