Re: [PATCH v2 1/1] remoteproc: qcom: Add remoteproc tracing

From: Gokul Krishna Krishnakumar
Date: Wed Mar 08 2023 - 17:49:36 EST




On 3/6/2023 4:17 AM, Mukesh Ojha wrote:


On 3/3/2023 9:24 AM, Gokul krishna Krishnakumar wrote:
This change attempts to add traces for start, stop, crash
subsystem/subdevice event 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.

Change-Id: I202814452192ca0733f134daf7c99201881e2c9c
Signed-off-by: Gokul krishna Krishnakumar <quic_gokukris@xxxxxxxxxxx>
---
  drivers/remoteproc/Makefile           |   1 +
  drivers/remoteproc/qcom_common.c      |  37 ++++++++
  drivers/remoteproc/qcom_q6v5.c        |   9 ++
  drivers/remoteproc/qcom_tracepoints.c |  12 +++
  drivers/remoteproc/remoteproc_core.c  |   8 ++
  include/trace/events/rproc_qcom.h     | 128 ++++++++++++++++++++++++++
  6 files changed, 195 insertions(+)
  create mode 100644 drivers/remoteproc/qcom_tracepoints.c
  create mode 100644 include/trace/events/rproc_qcom.h


I think, it is better to split this where first patch will introduce the trace event and in the later you can use at respective places.

Done.

diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
index 91314a9b43ce..3399fcaba39b 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -10,6 +10,7 @@ remoteproc-y                += remoteproc_debugfs.o
  remoteproc-y                += remoteproc_sysfs.o
  remoteproc-y                += remoteproc_virtio.o
  remoteproc-y                += remoteproc_elf_loader.o
+remoteproc-y                += qcom_tracepoints.o
  obj-$(CONFIG_REMOTEPROC_CDEV)        += remoteproc_cdev.o
  obj-$(CONFIG_IMX_REMOTEPROC)        += imx_rproc.o
  obj-$(CONFIG_IMX_DSP_REMOTEPROC)    += imx_dsp_rproc.o
diff --git a/drivers/remoteproc/qcom_common.c b/drivers/remoteproc/qcom_common.c
index 020349f8979d..09b79f39ccd6 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/rproc_qcom.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..aff91de3cea0 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/rproc_qcom.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/qcom_tracepoints.c b/drivers/remoteproc/qcom_tracepoints.c
new file mode 100644
index 000000000000..1b587ef54aa7
--- /dev/null
+++ b/drivers/remoteproc/qcom_tracepoints.c'

is it qcom specific ? No, i guess, as you have put traces in generic path as well.
Yes you are right the traces are generic to remoteproc events.
-Mukesh


Thanks for the review,
Gokul
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/rproc_qcom.h>
+EXPORT_TRACEPOINT_SYMBOL(rproc_load_event);
+EXPORT_TRACEPOINT_SYMBOL(rproc_start_event);
+EXPORT_TRACEPOINT_SYMBOL(rproc_stop_event);
+EXPORT_TRACEPOINT_SYMBOL(rproc_interrupt_event);
+EXPORT_TRACEPOINT_SYMBOL(rproc_subdev_event);
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 1cd4815a6dd1..6def868f0a98 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/rproc_qcom.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);
      }
diff --git a/include/trace/events/rproc_qcom.h b/include/trace/events/rproc_qcom.h
new file mode 100644
index 000000000000..66b10cb17965
--- /dev/null
+++ b/include/trace/events/rproc_qcom.h
@@ -0,0 +1,128 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM rproc_qcom
+
+#if !defined(_TRACE_RPROC_QCOM_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_RPROC_QCOM_H
+#include <linux/tracepoint.h>
+#include <linux/remoteproc.h>
+
+/*
+ * Tracepoints for remoteproc and subdevice events
+ */
+TRACE_EVENT(rproc_load_event,
+
+    TP_PROTO(struct rproc *rproc, int ret),
+
+    TP_ARGS(rproc, ret),
+
+    TP_STRUCT__entry(
+        __string(name, rproc->name)
+        __string(firmware, rproc->firmware)
+        __field(int,ret)
+    ),
+
+    TP_fast_assign(
+        __assign_str(name, rproc->name);
+        __assign_str(firmware, rproc->firmware);
+        __entry->ret = ret;
+    ),
+
+    TP_printk("%s loading firmware %s returned %d",
+            __get_str(name), __get_str(firmware),
+            __entry->ret)
+);
+
+TRACE_EVENT(rproc_start_event,
+
+    TP_PROTO(struct rproc *rproc, int ret),
+
+    TP_ARGS(rproc, ret),
+
+    TP_STRUCT__entry(
+        __string(name, rproc->name)
+        __field(int, ret)
+    ),
+
+    TP_fast_assign(
+        __assign_str(name, rproc->name);
+        __entry->ret = ret;
+    ),
+
+    TP_printk("%s %d", __get_str(name), __entry->ret)
+);
+
+TRACE_EVENT(rproc_stop_event,
+
+    TP_PROTO(struct rproc *rproc, char* crash_msg),
+
+    TP_ARGS(rproc, crash_msg),
+
+    TP_STRUCT__entry(
+        __string(name, rproc->name)
+        __string(crash_msg, crash_msg)
+    ),
+
+    TP_fast_assign(
+        __assign_str(name, rproc->name);
+        __assign_str(crash_msg, crash_msg)
+    ),
+
+    TP_printk("%s %s", __get_str(name), __get_str(crash_msg))
+);
+
+TRACE_EVENT(rproc_interrupt_event,
+
+    TP_PROTO(struct rproc *rproc, const char* event,
+             const char* msg),
+
+    TP_ARGS(rproc, event, msg),
+
+    TP_STRUCT__entry(
+        __string(name, rproc->name)
+        __string(event, event)
+        __string(msg, msg)
+    ),
+
+    TP_fast_assign(
+        __assign_str(name, rproc->name);
+        __assign_str(event, event);
+        __assign_str(msg, msg);
+    ),
+
+    TP_printk("%s %s returned %s", __get_str(name),
+             __get_str(event), __get_str(msg))
+);
+
+TRACE_EVENT(rproc_subdev_event,
+
+    TP_PROTO(const char* rproc, const char* subdev,
+            const char* event, int ret),
+
+    TP_ARGS(rproc, subdev, event, ret),
+
+    TP_STRUCT__entry(
+        __string(rproc, rproc)
+        __string(subdev, subdev)
+        __string(event, event)
+        __field(int, ret)
+    ),
+
+    TP_fast_assign(
+        __assign_str(rproc, rproc);
+        __assign_str(subdev, subdev);
+        __assign_str(event, event);
+        __entry->ret = ret;
+    ),
+
+    TP_printk("%s %s %s %d", __get_str(rproc), __get_str(subdev),
+            __get_str(event), __entry->ret)
+);
+#endif /* _TRACE_RPROC_QCOM_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>