DAOS-19150 bio: add percentage_used to nvme stats

src/bio/bio_internal.h

@@ -175,6 +175,9 @@ struct bio_dma_buffer {
 	X(bdh_unsafe_shutdowns, "unsafe_shutdowns",			\
 	  "Number of unsafe shutdowns (no notification prior to power loss)",  \
 	  "shutdowns", D_TM_COUNTER)					\
+	X(bdh_percentage_used, "percentage_used",			\
+	  "Percentage as canonical NAND-life indicator, hits 100 when the drive has consumed its rated endurance",\
+	  "percents", D_TM_GAUGE)					\
 	X(bdh_temp, "temp/current",					\
 	  "Current SSD temperature",					\
 	  "kelvins", D_TM_GAUGE)					\

src/bio/bio_monitor.c

@@ -512,6 +512,8 @@ populate_health_stats(struct bio_dev_health *bdh)
 	dev_state->unsafe_shutdowns	= page->unsafe_shutdowns[0];
 	d_tm_set_counter(bdh->bdh_unsafe_shutdowns,
 			 page->unsafe_shutdowns[0]);
+	dev_state->percentage_used = page->percentage_used;
+	d_tm_set_gauge(bdh->bdh_percentage_used, page->percentage_used);
 
 	/** temperature */
 	dev_state->warn_temp_time	= page->warning_temp_time;

src/control/lib/spdk/src/nvme_control_common.c

@@ -352,6 +352,7 @@ populate_dev_health(struct nvme_stats *stats,
 	stats->read_only_warn = cw.bits.read_only ? true : false;
 	stats->volatile_mem_warn = cw.bits.volatile_memory_backup ?
 				   true : false;
+	stats->percentage_used = hp->percentage_used;
 
 	/* Intel Smart Information Attributes */
 	if ((cdata == NULL) || (cdata->vid != SPDK_PCI_VID_INTEL))

src/include/daos_srv/control.h

@@ -105,6 +105,7 @@ struct nvme_stats {
 	uint64_t	 unsafe_shutdowns;
 	uint64_t	 media_errs;
 	uint64_t	 err_log_entries;
+	uint8_t		 percentage_used;
 	/* I/O error counters */
 	uint32_t	 bio_read_errs;
 	uint32_t	 bio_write_errs;

src/proto/ctl/smd.proto

@@ -1,5 +1,5 @@
 //
 // (C) Copyright 2019-2024 Intel Corporation.
 //
 // SPDX-License-Identifier: BSD-2-Clause-Patent
 //
@@ -79,6 +79,7 @@
 	uint32 link_max_width = 51; // maximum width (number of lanes)
 	float  link_neg_speed = 52; // negotiated speed in transactions per second
 	uint32 link_neg_width = 53; // negotiated width (number of lanes)
+	uint32 percentage_used = 54;
 }
 
 enum NvmeDevState {