[PATCH v4 2/2] remoteproc: qcom: Add remoteproc tracing

[Gokul krishna Krishnakumar]

This change attempts to add traces for start, stop, crash
subsystem/subdevice events, these will serve as standard checkpoints in
code and could help in debugging the failures in subdevice/subsystem
prepare, start, stop and unprepare functions. This will also breakdown
the time taken for each step in remoteproc bootup/shutdown process.

Signed-off-by: Gokul krishna Krishnakumar <quic_gokukris@xxxxxxxxxxx>
---
 drivers/remoteproc/qcom_common.c     | 37 ++++++++++++++++++++++++++++
 drivers/remoteproc/qcom_q6v5.c       |  9 +++++++
 drivers/remoteproc/remoteproc_core.c |  8 ++++++
 3 files changed, 54 insertions(+)

diff --git a/drivers/remoteproc/qcom_common.c b/drivers/remoteproc/qcom_common.c
index 020349f8979d..5bf6b8bc67c5 100644
--- a/drivers/remoteproc/qcom_common.c
+++ b/drivers/remoteproc/qcom_common.c
@@ -18,6 +18,7 @@
 #include <linux/slab.h>
 #include <linux/soc/qcom/mdt_loader.h>
 #include <linux/soc/qcom/smem.h>
+#include <trace/events/remoteproc_tracepoints.h>
 
 #include "remoteproc_internal.h"
 #include "qcom_common.h"
@@ -186,6 +187,10 @@ static int glink_subdev_start(struct rproc_subdev *subdev)
 
 	glink->edge = qcom_glink_smem_register(glink->dev, glink->node);
 
+	trace_rproc_subdev_event(dev_name(glink->dev->parent),
+					"glink", "start",
+					PTR_ERR_OR_ZERO(glink->edge));
+
 	return PTR_ERR_OR_ZERO(glink->edge);
 }
 
@@ -194,6 +199,11 @@ static void glink_subdev_stop(struct rproc_subdev *subdev, bool crashed)
 	struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
 
 	qcom_glink_smem_unregister(glink->edge);
+
+	trace_rproc_subdev_event(dev_name(glink->dev->parent),
+					"glink", "stop",
+					PTR_ERR_OR_ZERO(glink->edge));
+
 	glink->edge = NULL;
 }
 
@@ -201,6 +211,10 @@ static void glink_subdev_unprepare(struct rproc_subdev *subdev)
 {
 	struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
 
+	trace_rproc_subdev_event(dev_name(glink->dev->parent),
+					"glink", "unprepare",
+					PTR_ERR_OR_ZERO(glink->edge));
+
 	qcom_glink_ssr_notify(glink->ssr_name);
 }
 
@@ -295,6 +309,10 @@ static int smd_subdev_start(struct rproc_subdev *subdev)
 {
 	struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
 
+	trace_rproc_subdev_event(dev_name(smd->dev->parent),
+					"smd", "start",
+					PTR_ERR_OR_ZERO(smd->edge));
+
 	smd->edge = qcom_smd_register_edge(smd->dev, smd->node);
 
 	return PTR_ERR_OR_ZERO(smd->edge);
@@ -304,6 +322,10 @@ static void smd_subdev_stop(struct rproc_subdev *subdev, bool crashed)
 {
 	struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
 
+	trace_rproc_subdev_event(dev_name(smd->dev->parent),
+					"smd", "stop",
+					PTR_ERR_OR_ZERO(smd->edge));
+
 	qcom_smd_unregister_edge(smd->edge);
 	smd->edge = NULL;
 }
@@ -420,6 +442,10 @@ static int ssr_notify_prepare(struct rproc_subdev *subdev)
 		.crashed = false,
 	};
 
+	trace_rproc_subdev_event(ssr->info->name,
+					"ssr", "QCOM_SSR_BEFORE_POWERUP",
+					data.crashed);
+
 	srcu_notifier_call_chain(&ssr->info->notifier_list,
 				 QCOM_SSR_BEFORE_POWERUP, &data);
 	return 0;
@@ -432,6 +458,9 @@ static int ssr_notify_start(struct rproc_subdev *subdev)
 		.name = ssr->info->name,
 		.crashed = false,
 	};
+	trace_rproc_subdev_event(ssr->info->name,
+					"ssr", "QCOM_SSR_AFTER_POWERUP",
+					data.crashed);
 
 	srcu_notifier_call_chain(&ssr->info->notifier_list,
 				 QCOM_SSR_AFTER_POWERUP, &data);
@@ -446,6 +475,10 @@ static void ssr_notify_stop(struct rproc_subdev *subdev, bool crashed)
 		.crashed = crashed,
 	};
 
+	trace_rproc_subdev_event(ssr->info->name,
+					"ssr", "QCOM_SSR_BEFORE_SHUTDOWN",
+					data.crashed);
+
 	srcu_notifier_call_chain(&ssr->info->notifier_list,
 				 QCOM_SSR_BEFORE_SHUTDOWN, &data);
 }
@@ -458,6 +491,10 @@ static void ssr_notify_unprepare(struct rproc_subdev *subdev)
 		.crashed = false,
 	};
 
+	trace_rproc_subdev_event(ssr->info->name,
+					"ssr", "QCOM_SSR_AFTER_SHUTDOWN",
+					data.crashed);
+
 	srcu_notifier_call_chain(&ssr->info->notifier_list,
 				 QCOM_SSR_AFTER_SHUTDOWN, &data);
 }
diff --git a/drivers/remoteproc/qcom_q6v5.c b/drivers/remoteproc/qcom_q6v5.c
index 497acfb33f8f..cf3f322be65e 100644
--- a/drivers/remoteproc/qcom_q6v5.c
+++ b/drivers/remoteproc/qcom_q6v5.c
@@ -15,6 +15,7 @@
 #include <linux/soc/qcom/smem.h>
 #include <linux/soc/qcom/smem_state.h>
 #include <linux/remoteproc.h>
+#include <trace/events/remoteproc_tracepoints.h>
 #include "qcom_common.h"
 #include "qcom_q6v5.h"
 
@@ -113,6 +114,7 @@ static irqreturn_t q6v5_wdog_interrupt(int irq, void *data)
 		dev_err(q6v5->dev, "watchdog without message\n");
 
 	q6v5->running = false;
+	trace_rproc_interrupt_event(q6v5->rproc, "q6v5_wdog", msg);
 	rproc_report_crash(q6v5->rproc, RPROC_WATCHDOG);
 
 	return IRQ_HANDLED;
@@ -134,6 +136,7 @@ static irqreturn_t q6v5_fatal_interrupt(int irq, void *data)
 		dev_err(q6v5->dev, "fatal error without message\n");
 
 	q6v5->running = false;
+	trace_rproc_interrupt_event(q6v5->rproc, "fatal", msg);
 	rproc_report_crash(q6v5->rproc, RPROC_FATAL_ERROR);
 
 	return IRQ_HANDLED;
@@ -165,6 +168,8 @@ int qcom_q6v5_wait_for_start(struct qcom_q6v5 *q6v5, int timeout)
 	if (!ret)
 		disable_irq(q6v5->handover_irq);
 
+	trace_rproc_interrupt_event(q6v5->rproc, "Ready", !ret ? "-ETIMEDOUT":"done");
+
 	return !ret ? -ETIMEDOUT : 0;
 }
 EXPORT_SYMBOL_GPL(qcom_q6v5_wait_for_start);
@@ -180,6 +185,8 @@ static irqreturn_t q6v5_handover_interrupt(int irq, void *data)
 
 	q6v5->handover_issued = true;
 
+	trace_rproc_interrupt_event(q6v5->rproc, "handover", "Proxy votes removed");
+
 	return IRQ_HANDLED;
 }
 
@@ -216,6 +223,8 @@ int qcom_q6v5_request_stop(struct qcom_q6v5 *q6v5, struct qcom_sysmon *sysmon)
 
 	qcom_smem_state_update_bits(q6v5->state, BIT(q6v5->stop_bit), 0);
 
+	trace_rproc_interrupt_event(q6v5->rproc, "Stop", ret ? "done":"-EETIMEDOUT");
+
 	return ret == 0 ? -ETIMEDOUT : 0;
 }
 EXPORT_SYMBOL_GPL(qcom_q6v5_request_stop);
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 1cd4815a6dd1..d8dc91a15477 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -38,6 +38,7 @@
 #include <linux/virtio_ring.h>
 #include <asm/byteorder.h>
 #include <linux/platform_device.h>
+#include <trace/events/remoteproc_tracepoints.h>
 
 #include "remoteproc_internal.h"
 
@@ -1270,6 +1271,7 @@ static int rproc_start(struct rproc *rproc, const struct firmware *fw)
 
 	/* load the ELF segments to memory */
 	ret = rproc_load_segments(rproc, fw);
+	trace_rproc_load_event(rproc, ret);
 	if (ret) {
 		dev_err(dev, "Failed to load program segments: %d\n", ret);
 		return ret;
@@ -1305,6 +1307,7 @@ static int rproc_start(struct rproc *rproc, const struct firmware *fw)
 
 	/* Start any subdevices for the remote processor */
 	ret = rproc_start_subdevices(rproc);
+
 	if (ret) {
 		dev_err(dev, "failed to probe subdevices for %s: %d\n",
 			rproc->name, ret);
@@ -1729,6 +1732,8 @@ static int rproc_stop(struct rproc *rproc, bool crashed)
 		return ret;
 	}
 
+	trace_rproc_stop_event(rproc, crashed ? "crash stop" : "stop");
+
 	rproc_unprepare_subdevices(rproc);
 
 	rproc->state = RPROC_OFFLINE;
@@ -1939,6 +1944,8 @@ int rproc_boot(struct rproc *rproc)
 		dev_info(dev, "attaching to %s\n", rproc->name);
 
 		ret = rproc_attach(rproc);
+		trace_rproc_start_event(rproc, ret);
+
 	} else {
 		dev_info(dev, "powering up %s\n", rproc->name);
 
@@ -1950,6 +1957,7 @@ int rproc_boot(struct rproc *rproc)
 		}
 
 		ret = rproc_fw_boot(rproc, firmware_p);
+		trace_rproc_start_event(rproc, ret);
 
 		release_firmware(firmware_p);
 	}
-- 
2.40.1