[PATCH v3 12/24] firmware: arm_scmi: Add support for Telemetry reset
From: Cristian Marussi <cristian.marussi@arm.com>
Date: 2026-03-29 16:34:53
Also in:
arm-scmi, linux-doc, linux-fsdevel, lkml
Subsystem:
system control & power/management interface (scpi/scmi) message protocol drivers, the rest · Maintainers:
Sudeep Holla, Linus Torvalds
Add support for Telemetry operations needed to request platform to reset telemetry current configuration and data events values. Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> --- v2 --> v3 - split from monolithic Telemetry patch - use scmi_telemetry_de_unlink --- drivers/firmware/arm_scmi/telemetry.c | 44 +++++++++++++++++++++++++++ include/linux/scmi_protocol.h | 2 ++ 2 files changed, 46 insertions(+)
diff --git a/drivers/firmware/arm_scmi/telemetry.c b/drivers/firmware/arm_scmi/telemetry.c
index 61eaad817db4..ff0a5a8f6f57 100644
--- a/drivers/firmware/arm_scmi/telemetry.c
+++ b/drivers/firmware/arm_scmi/telemetry.c@@ -2456,6 +2456,49 @@ static int scmi_telemetry_des_sample_get(const struct scmi_protocol_handle *ph, return ret; } +static void scmi_telemetry_local_resources_reset(struct telemetry_info *ti) +{ + struct scmi_telemetry_res_info *rinfo; + + /* Get rinfo as it is...without triggering an enumeration */ + rinfo = __scmi_telemetry_resources_get(ti); + /* Clear all local state...*/ + for (int i = 0; i < rinfo->num_des; i++) { + rinfo->des[i]->enabled = false; + rinfo->des[i]->tstamp_enabled = false; + + scmi_telemetry_de_unlink(rinfo->des[i]); + } + for (int i = 0; i < rinfo->num_groups; i++) { + rinfo->grps[i].enabled = false; + rinfo->grps[i].tstamp_enabled = false; + rinfo->grps[i].current_mode = SCMI_TLM_ONDEMAND; + rinfo->grps[i].active_update_interval = 0; + } +} + +static int scmi_telemetry_reset(const struct scmi_protocol_handle *ph) +{ + struct scmi_xfer *t; + int ret; + + ret = ph->xops->xfer_get_init(ph, TELEMETRY_RESET, sizeof(u32), 0, &t); + if (ret) + return ret; + + put_unaligned_le32(0, t->tx.buf); + ret = ph->xops->do_xfer(ph, t); + if (!ret) { + struct telemetry_info *ti = ph->get_priv(ph); + + scmi_telemetry_local_resources_reset(ti); + } + + ph->xops->xfer_put(ph, t); + + return ret; +} + static const struct scmi_telemetry_proto_ops tlm_proto_ops = { .info_get = scmi_telemetry_info_get, .de_lookup = scmi_telemetry_de_lookup,
@@ -2467,6 +2510,7 @@ static const struct scmi_telemetry_proto_ops tlm_proto_ops = { .de_data_read = scmi_telemetry_de_data_read, .des_bulk_read = scmi_telemetry_des_bulk_read, .des_sample_get = scmi_telemetry_des_sample_get, + .reset = scmi_telemetry_reset, }; /**
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index 5f05df297064..fc3b5493dc1a 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h@@ -963,6 +963,7 @@ struct scmi_telemetry_de_sample { * the ones belonging to a specific group when provided. * This causes an immediate update platform-side of all the * enabled DEs. + * @reset: reset configuration and telemetry data. */ struct scmi_telemetry_proto_ops { const struct scmi_telemetry_info __must_check *(*info_get)
@@ -989,6 +990,7 @@ struct scmi_telemetry_proto_ops { int __must_check (*des_sample_get)(const struct scmi_protocol_handle *ph, int grp_id, int *num_samples, struct scmi_telemetry_de_sample *samples); + int (*reset)(const struct scmi_protocol_handle *ph); }; /**
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2.53.0