linux-kernel - [PATCH v1 2/4] mmc: core: Add trace event for SD SSR response

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Date:   Mon, 15 Apr 2019 16:52:39 -0600
From:   Raul E Rangel <rrangel@...omium.org>
To:     linux-mmc@...r.kernel.org, linux-trace-devel@...r.kernel.org
Cc:     djkurtz@...omium.org, zwisler@...omium.org,
        Raul E Rangel <rrangel@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        hongjiefang <hongjiefang@...micro.com>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        Kyle Roeschley <kyle.roeschley@...com>,
        Avri Altman <avri.altman@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH v1 2/4] mmc: core: Add trace event for SD SSR response

Example:
sd_ssr: mmc0: au: 8192, erase time: 0, erase offset: 0x0, raw: {0x0,0x3000000,0x1019000,0x10000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0}

Signed-off-by: Raul E Rangel <rrangel@...omium.org>
---

 drivers/mmc/core/sd.c      |  2 ++
 include/trace/events/mmc.h | 31 +++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 3bed7c4b6d75..cc33a4f96c6a 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -282,6 +282,8 @@ static int mmc_read_ssr(struct mmc_card *card)
 		}
 	}
 
+	trace_sd_ssr(card);
+
 	/*
 	 * starting SD5.1 discard is supported if DISCARD_SUPPORT (b313) is set
 	 */
diff --git a/include/trace/events/mmc.h b/include/trace/events/mmc.h
index e45258e8a6cb..cad604ee800f 100644
--- a/include/trace/events/mmc.h
+++ b/include/trace/events/mmc.h
@@ -52,6 +52,37 @@ TRACE_EVENT(sd_scr,
 	)
 );
 
+TRACE_EVENT(sd_ssr,
+
+	TP_PROTO(struct mmc_card *card),
+
+	TP_ARGS(card),
+
+	TP_STRUCT__entry(
+		__array(u32,			raw,	16)
+		__field(unsigned int,		au)
+		__field(unsigned int,		erase_timeout)
+		__field(unsigned int,		erase_offset)
+		__string(name,			mmc_hostname(card->host))
+	),
+
+	TP_fast_assign(
+		memcpy(__entry->raw, card->raw_ssr, sizeof(card->raw_ssr));
+		__entry->au = card->ssr.au;
+		__entry->erase_timeout = card->ssr.erase_timeout;
+		__entry->erase_offset = card->ssr.erase_offset;
+		__assign_str(name, mmc_hostname(card->host));
+	),
+
+	TP_printk("%s: au: %d, erase time: %d, erase offset: %#x, raw: %s",
+		  __get_str(name),
+		  __entry->au,
+		  __entry->erase_timeout,
+		  __entry->erase_offset,
+		  __print_array(__entry->raw, 16, sizeof(u32))
+	)
+);
+
 TRACE_EVENT(mmc_request_start,
 
 	TP_PROTO(struct mmc_host *host, struct mmc_request *mrq),
-- 
2.21.0.392.gf8f6787159e-goog