[PATCH v2 2/4] mmc: core: Add trace event for SD SSR response

[Raul E Rangel]

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 <rran...@chromium.org>
---

 drivers/mmc/core/sd.c      |  2 ++
 include/trace/events/mmc.h | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index f1772972d6a3..908c3087cdcd 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -292,6 +292,8 @@ static int mmc_read_ssr(struct mmc_card *card)
        card->erase_arg = (card->scr.sda_specx && discard_support) ?
                            SD_DISCARD_ARG : SD_ERASE_ARG;
 
+       trace_sd_ssr(card);
+
        return 0;
 }
 
diff --git a/include/trace/events/mmc.h b/include/trace/events/mmc.h
index 9761d3db16db..463cf318d762 100644
--- a/include/trace/events/mmc.h
+++ b/include/trace/events/mmc.h
@@ -61,6 +61,38 @@ 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(
+               BUILD_BUG_ON(sizeof(card->raw_ssr) != sizeof(__entry->raw));
+               memcpy(__entry->raw, card->raw_ssr, sizeof(__entry->raw));
+               __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