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Subject[PATCH v2 1/4] mmc: core: Add trace event for SD SCR response
Date
Example:
sd_scr: mmc0: version: 2, spec3: 1, width: [1-BIT | 4-BIT], cmds: [], raw: {0x2b58000,0x0} */

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

drivers/mmc/core/sd.c | 6 +++++
include/trace/events/mmc.h | 51 ++++++++++++++++++++++++++++++++++++++
2 files changed, 57 insertions(+)

diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 265e1aeeb9d8..f1772972d6a3 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -21,6 +21,8 @@
#include <linux/mmc/mmc.h>
#include <linux/mmc/sd.h>

+#include <trace/events/mmc.h>
+
#include "core.h"
#include "card.h"
#include "host.h"
@@ -200,6 +202,7 @@ static int mmc_decode_scr(struct mmc_card *card)
if (scr_struct != 0) {
pr_err("%s: unrecognised SCR structure version %d\n",
mmc_hostname(card->host), scr_struct);
+ trace_sd_scr(card, NULL);
return -EINVAL;
}

@@ -221,6 +224,9 @@ static int mmc_decode_scr(struct mmc_card *card)

if (scr->sda_spec3)
scr->cmds = UNSTUFF_BITS(resp, 32, 2);
+
+ trace_sd_scr(card, scr);
+
return 0;
}

diff --git a/include/trace/events/mmc.h b/include/trace/events/mmc.h
index 7b706ff21335..9761d3db16db 100644
--- a/include/trace/events/mmc.h
+++ b/include/trace/events/mmc.h
@@ -10,6 +10,57 @@
#include <linux/mmc/host.h>
#include <linux/tracepoint.h>

+#define SD_SCR_WIDTH_FLAGS \
+ {SD_SCR_BUS_WIDTH_1, "1-BIT"}, \
+ {SD_SCR_BUS_WIDTH_4, "4-BIT"}
+
+#define SD_SCR_CMD_FLAGS \
+ {SD_SCR_CMD20_SUPPORT, "CMD20"},\
+ {SD_SCR_CMD23_SUPPORT, "CMD23"}
+
+TRACE_EVENT(sd_scr,
+
+ TP_PROTO(struct mmc_card *card, struct sd_scr *scr),
+
+ TP_ARGS(card, scr),
+
+ TP_STRUCT__entry(
+ __array(u32, raw, 2)
+ __field(unsigned char, sda_vsn)
+ __field(unsigned char, sda_spec3)
+ __field(unsigned char, bus_widths)
+ __field(unsigned char, cmds)
+ __string(name, mmc_hostname(card->host))
+ ),
+
+ TP_fast_assign(
+ BUILD_BUG_ON(sizeof(card->raw_scr) != sizeof(__entry->raw));
+ memcpy(__entry->raw, card->raw_scr, sizeof(__entry->raw));
+ if (scr) {
+ __entry->sda_vsn = scr->sda_vsn;
+ __entry->sda_spec3 = scr->sda_spec3;
+ __entry->bus_widths = scr->bus_widths;
+ __entry->cmds = scr->cmds;
+ } else {
+ __entry->sda_vsn = 0;
+ __entry->sda_spec3 = 0;
+ __entry->bus_widths = 0;
+ __entry->cmds = 0;
+ }
+ __assign_str(name, mmc_hostname(card->host));
+ ),
+
+ TP_printk("%s: version: %d, spec3: %d, width: [%s], cmds: [%s], "
+ "raw: %s",
+ __get_str(name),
+ __entry->sda_vsn,
+ __entry->sda_spec3,
+ __print_flags(__entry->bus_widths, " | ", SD_SCR_WIDTH_FLAGS),
+ __print_flags(__entry->cmds, " | ", SD_SCR_CMD_FLAGS),
+ __print_array(__entry->raw, 2, sizeof(u32))
+ )
+);
+
TRACE_EVENT(mmc_request_start,

TP_PROTO(struct mmc_host *host, struct mmc_request *mrq),
--
2.21.0.392.gf8f6787159e-goog
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