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authorChaitanya Kulkarni <chaitanya.kulkarni@wdc.com>2020-03-25 10:49:55 -0700
committerJens Axboe <axboe@kernel.dk>2020-03-27 13:39:10 -0600
commitc51d04199826824944ed563748c9542eea27c2d7 (patch)
treeb903c7c7edb2881ab10d29d0aee4715eba7cfeea /drivers/block
parent02694e86356dcf72d39329e52630234ad687e206 (diff)
downloadlinux-c51d04199826824944ed563748c9542eea27c2d7.tar.bz2
null_blk: add tracepoint helpers for zoned mode
This patch adds two new tracpoints for null_blk_zoned.c that allows us to trace report-zones, zone-mgmt-op and zone-write operations which has direct effect on the zone condition state machine. Also, we update drivers/block/Makefile so that new null_blk related tracefiles can be compiled. Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/Makefile6
-rw-r--r--drivers/block/null_blk_trace.c21
-rw-r--r--drivers/block/null_blk_trace.h79
3 files changed, 106 insertions, 0 deletions
diff --git a/drivers/block/Makefile b/drivers/block/Makefile
index a53cc1e3a2d3..795facd8cf19 100644
--- a/drivers/block/Makefile
+++ b/drivers/block/Makefile
@@ -6,6 +6,9 @@
# Rewritten to use lists instead of if-statements.
#
+# needed for trace events
+ccflags-y += -I$(src)
+
obj-$(CONFIG_MAC_FLOPPY) += swim3.o
obj-$(CONFIG_BLK_DEV_SWIM) += swim_mod.o
obj-$(CONFIG_BLK_DEV_FD) += floppy.o
@@ -39,6 +42,9 @@ obj-$(CONFIG_ZRAM) += zram/
obj-$(CONFIG_BLK_DEV_NULL_BLK) += null_blk.o
null_blk-objs := null_blk_main.o
+ifeq ($(CONFIG_BLK_DEV_ZONED), y)
+null_blk-$(CONFIG_TRACING) += null_blk_trace.o
+endif
null_blk-$(CONFIG_BLK_DEV_ZONED) += null_blk_zoned.o
skd-y := skd_main.o
diff --git a/drivers/block/null_blk_trace.c b/drivers/block/null_blk_trace.c
new file mode 100644
index 000000000000..f246e7bff698
--- /dev/null
+++ b/drivers/block/null_blk_trace.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * null_blk trace related helpers.
+ *
+ * Copyright (C) 2020 Western Digital Corporation or its affiliates.
+ */
+#include "null_blk_trace.h"
+
+/*
+ * Helper to use for all null_blk traces to extract disk name.
+ */
+const char *nullb_trace_disk_name(struct trace_seq *p, char *name)
+{
+ const char *ret = trace_seq_buffer_ptr(p);
+
+ if (name && *name)
+ trace_seq_printf(p, "disk=%s, ", name);
+ trace_seq_putc(p, 0);
+
+ return ret;
+}
diff --git a/drivers/block/null_blk_trace.h b/drivers/block/null_blk_trace.h
new file mode 100644
index 000000000000..4f83032eb544
--- /dev/null
+++ b/drivers/block/null_blk_trace.h
@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * null_blk device driver tracepoints.
+ *
+ * Copyright (C) 2020 Western Digital Corporation or its affiliates.
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM nullb
+
+#if !defined(_TRACE_NULLB_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_NULLB_H
+
+#include <linux/tracepoint.h>
+#include <linux/trace_seq.h>
+
+#include "null_blk.h"
+
+const char *nullb_trace_disk_name(struct trace_seq *p, char *name);
+
+#define __print_disk_name(name) nullb_trace_disk_name(p, name)
+
+#ifndef TRACE_HEADER_MULTI_READ
+static inline void __assign_disk_name(char *name, struct gendisk *disk)
+{
+ if (disk)
+ memcpy(name, disk->disk_name, DISK_NAME_LEN);
+ else
+ memset(name, 0, DISK_NAME_LEN);
+}
+#endif
+
+TRACE_EVENT(nullb_zone_op,
+ TP_PROTO(struct nullb_cmd *cmd, unsigned int zone_no,
+ unsigned int zone_cond),
+ TP_ARGS(cmd, zone_no, zone_cond),
+ TP_STRUCT__entry(
+ __array(char, disk, DISK_NAME_LEN)
+ __field(enum req_opf, op)
+ __field(unsigned int, zone_no)
+ __field(unsigned int, zone_cond)
+ ),
+ TP_fast_assign(
+ __entry->op = req_op(cmd->rq);
+ __entry->zone_no = zone_no;
+ __entry->zone_cond = zone_cond;
+ __assign_disk_name(__entry->disk, cmd->rq->rq_disk);
+ ),
+ TP_printk("%s req=%-15s zone_no=%u zone_cond=%-10s",
+ __print_disk_name(__entry->disk),
+ blk_op_str(__entry->op),
+ __entry->zone_no,
+ blk_zone_cond_str(__entry->zone_cond))
+);
+
+TRACE_EVENT(nullb_report_zones,
+ TP_PROTO(struct nullb *nullb, unsigned int nr_zones),
+ TP_ARGS(nullb, nr_zones),
+ TP_STRUCT__entry(
+ __array(char, disk, DISK_NAME_LEN)
+ __field(unsigned int, nr_zones)
+ ),
+ TP_fast_assign(
+ __entry->nr_zones = nr_zones;
+ __assign_disk_name(__entry->disk, nullb->disk);
+ ),
+ TP_printk("%s nr_zones=%u",
+ __print_disk_name(__entry->disk), __entry->nr_zones)
+);
+
+#endif /* _TRACE_NULLB_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE null_blk_trace
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>