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Message-ID: <20260114114638.2290765-8-cristian.marussi@arm.com>
Date: Wed, 14 Jan 2026 11:46:11 +0000
From: Cristian Marussi <cristian.marussi@....com>
To: linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
arm-scmi@...r.kernel.org,
linux-fsdevel@...r.kernel.org
Cc: sudeep.holla@....com,
james.quinlan@...adcom.com,
f.fainelli@...il.com,
vincent.guittot@...aro.org,
etienne.carriere@...com,
peng.fan@....nxp.com,
michal.simek@....com,
dan.carpenter@...aro.org,
d-gole@...com,
jonathan.cameron@...wei.com,
elif.topuz@....com,
lukasz.luba@....com,
philip.radford@....com,
souvik.chakravarty@....com,
Cristian Marussi <cristian.marussi@....com>
Subject: [PATCH v2 07/17] firmware: arm_scmi: Use new Telemetry traces
Track failed SHMTI accesses and received notifications.
Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
drivers/firmware/arm_scmi/telemetry.c | 57 ++++++++++++++++++++++-----
1 file changed, 48 insertions(+), 9 deletions(-)
diff --git a/drivers/firmware/arm_scmi/telemetry.c b/drivers/firmware/arm_scmi/telemetry.c
index 16bcdcdc1dc3..443e032a3553 100644
--- a/drivers/firmware/arm_scmi/telemetry.c
+++ b/drivers/firmware/arm_scmi/telemetry.c
@@ -25,6 +25,8 @@
#include "protocols.h"
#include "notify.h"
+#include <trace/events/scmi.h>
+
/* Updated only after ALL the mandatory features for that version are merged */
#define SCMI_PROTOCOL_SUPPORTED_VERSION 0x10000
@@ -1366,8 +1368,10 @@ static void scmi_telemetry_tdcf_blkts_parse(struct telemetry_info *ti,
/* Check for spec compliance */
if (USE_LINE_TS(payld) || USE_BLK_TS(payld) ||
- DATA_INVALID(payld) || (PAYLD_ID(payld) != 0))
+ DATA_INVALID(payld) || (PAYLD_ID(payld) != 0)) {
+ trace_scmi_tlm_access(0, "BLK_TS_INVALID", 0, 0);
return;
+ }
/* A BLK_TS descriptor MUST be returned: it is found or it is crated */
bts = scmi_telemetry_blkts_lookup(ti->ph->dev, &ti->xa_bts, payld);
@@ -1376,6 +1380,9 @@ static void scmi_telemetry_tdcf_blkts_parse(struct telemetry_info *ti,
/* Update the descriptor with the lastest TS*/
scmi_telemetry_blkts_update(shmti->last_magic, bts);
+
+ trace_scmi_tlm_collect(bts->last_ts, (u64)payld,
+ bts->last_magic, "SHMTI_BLK_TS");
}
static void scmi_telemetry_tdcf_data_parse(struct telemetry_info *ti,
@@ -1393,8 +1400,10 @@ static void scmi_telemetry_tdcf_data_parse(struct telemetry_info *ti,
/* Is thi DE ID know ? */
tde = scmi_telemetry_tde_lookup(ti, de_id);
if (!tde) {
- if (mode != SCAN_DISCOVERY)
+ if (mode != SCAN_DISCOVERY) {
+ trace_scmi_tlm_access(de_id, "DE_INVALID", 0, 0);
return;
+ }
/* In SCAN_DISCOVERY mode we allocate new DEs for unknown IDs */
tde = scmi_telemetry_tde_get(ti, de_id);
@@ -1462,6 +1471,8 @@ static void scmi_telemetry_tdcf_data_parse(struct telemetry_info *ti,
tde->last_ts = tstamp;
else
tde->last_ts = 0;
+
+ trace_scmi_tlm_collect(0, tde->de.info->id, tde->last_val, "SHMTI_DE_UPDT");
}
static int scmi_telemetry_tdcf_line_parse(struct telemetry_info *ti,
@@ -1507,8 +1518,10 @@ static int scmi_telemetry_shmti_scan(struct telemetry_info *ti,
fsleep((SCMI_TLM_TDCF_MAX_RETRIES - retries) * 1000);
startm = TDCF_START_SEQ_GET(tdcf);
- if (IS_BAD_START_SEQ(startm))
+ if (IS_BAD_START_SEQ(startm)) {
+ trace_scmi_tlm_access(0, "MSEQ_BADSTART", startm, 0);
continue;
+ }
/* On a BAD_SEQ this will be updated on the next attempt */
shmti->last_magic = startm;
@@ -1520,18 +1533,25 @@ static int scmi_telemetry_shmti_scan(struct telemetry_info *ti,
used_qwords = scmi_telemetry_tdcf_line_parse(ti, next,
shmti, mode);
- if (qwords < used_qwords)
+ if (qwords < used_qwords) {
+ trace_scmi_tlm_access(PAYLD_ID(next),
+ "BAD_QWORDS", startm, 0);
return -EINVAL;
+ }
next += used_qwords * 8;
qwords -= used_qwords;
}
endm = TDCF_END_SEQ_GET(eplg);
+ if (startm != endm)
+ trace_scmi_tlm_access(0, "MSEQ_MISMATCH", startm, endm);
} while (startm != endm && --retries);
- if (startm != endm)
+ if (startm != endm) {
+ trace_scmi_tlm_access(0, "TDCF_SCAN_FAIL", startm, endm);
return -EPROTO;
+ }
return 0;
}
@@ -1923,6 +1943,8 @@ static void scmi_telemetry_scan_update(struct telemetry_info *ti, u64 ts)
tde->last_ts = tstamp;
else
tde->last_ts = 0;
+
+ trace_scmi_tlm_collect(ts, tde->de.info->id, tde->last_val, "FC_UPDATE");
}
}
@@ -2001,8 +2023,11 @@ static int scmi_telemetry_tdcf_de_parse(struct telemetry_de *tde,
fsleep((SCMI_TLM_TDCF_MAX_RETRIES - retries) * 1000);
startm = TDCF_START_SEQ_GET(tdcf);
- if (IS_BAD_START_SEQ(startm))
+ if (IS_BAD_START_SEQ(startm)) {
+ trace_scmi_tlm_access(tde->de.info->id, "MSEQ_BADSTART",
+ startm, 0);
continue;
+ }
/* Has anything changed at all at the SHMTI level ? */
scoped_guard(mutex, &tde->mtx) {
@@ -2018,11 +2043,16 @@ static int scmi_telemetry_tdcf_de_parse(struct telemetry_de *tde,
if (DATA_INVALID(payld))
return -EINVAL;
- if (IS_BLK_TS(payld))
+ if (IS_BLK_TS(payld)) {
+ trace_scmi_tlm_access(tde->de.info->id,
+ "BAD_DE_META", 0, 0);
return -EINVAL;
+ }
- if (PAYLD_ID(payld) != tde->de.info->id)
+ if (PAYLD_ID(payld) != tde->de.info->id) {
+ trace_scmi_tlm_access(tde->de.info->id, "DE_INVALID", 0, 0);
return -EINVAL;
+ }
/* Data is always valid since NOT handling BLK TS lines here */
*val = LINE_DATA_GET(&payld->l);
@@ -2046,10 +2076,16 @@ static int scmi_telemetry_tdcf_de_parse(struct telemetry_de *tde,
}
endm = TDCF_END_SEQ_GET(tde->eplg);
+ if (startm != endm)
+ trace_scmi_tlm_access(tde->de.info->id, "MSEQ_MISMATCH",
+ startm, endm);
} while (startm != endm && --retries);
- if (startm != endm)
+ if (startm != endm) {
+ trace_scmi_tlm_access(tde->de.info->id, "TDCF_DE_FAIL",
+ startm, endm);
return -EPROTO;
+ }
guard(mutex)(&tde->mtx);
tde->last_magic = startm;
@@ -2230,6 +2266,9 @@ scmi_telemetry_msg_payld_process(struct telemetry_info *ti,
tde->last_ts = LINE_TSTAMP_GET(&payld->tsl);
else
tde->last_ts = 0;
+
+ trace_scmi_tlm_collect(timestamp, tde->de.info->id, tde->last_val,
+ "MESSAGE");
}
}
--
2.52.0
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