linux-kernel - [RFC PATCH 11/16] rv/monitors: wwnr instrumentation and Makefile/Kconfig entries

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Date:   Wed, 19 May 2021 13:36:32 +0200
From:   Daniel Bristot de Oliveira <bristot@...hat.com>
To:     linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>
Cc:     Tommaso Cucinotta <tommaso.cucinotta@...tannapisa.it>,
        Kate Carcia <kcarcia@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Ingo Molnar <mingo@...hat.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Gabriele Paoloni <gabriele.paoloni@...el.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Clark Williams <williams@...hat.com>, linux-doc@...r.kernel.org
Subject: [RFC PATCH 11/16] rv/monitors: wwnr instrumentation and Makefile/Kconfig entries

Adds the instrumentation to the previously created wwnr monitor, as an
example of the developer work. It also adds a Makefile and Kconfig
entries.

Cc: Jonathan Corbet <corbet@....net>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Will Deacon <will@...nel.org>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: "Paul E. McKenney" <paulmck@...nel.org>
Cc: Joel Fernandes <joel@...lfernandes.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Gabriele Paoloni <gabriele.paoloni@...el.com>
Cc: Juri Lelli <juri.lelli@...hat.com>
Cc: Clark Williams <williams@...hat.com>
Cc: linux-doc@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Daniel Bristot de Oliveira <bristot@...hat.com>
---
 kernel/trace/rv/Kconfig              |  7 ++++++
 kernel/trace/rv/Makefile             |  1 +
 kernel/trace/rv/monitors/wwnr/wwnr.c | 35 ++++++++++++----------------
 kernel/trace/rv/monitors/wwnr/wwnr.h |  2 +-
 4 files changed, 24 insertions(+), 21 deletions(-)

diff --git a/kernel/trace/rv/Kconfig b/kernel/trace/rv/Kconfig
index 4a1088c5ba68..612b36b97663 100644
--- a/kernel/trace/rv/Kconfig
+++ b/kernel/trace/rv/Kconfig
@@ -21,6 +21,13 @@ config RV_MON_WIP
 	  Enable WIP sample monitor, this is a sample monitor that
 	  illustrates the usage of per-cpu monitors.
 
+config RV_MON_WWNR
+	tristate "WWNR monitor"
+	help
+	  Enable WWNR sample monitor, this is a sample monitor that
+	  illustrates the usage of per-task monitor. The model is
+	  broken on purpose: it serves to test reactors.
+
 config RV_REACTORS
 	bool "Runtime verification reactors"
 	default y if RV
diff --git a/kernel/trace/rv/Makefile b/kernel/trace/rv/Makefile
index b41109d2750a..af0ff9a46418 100644
--- a/kernel/trace/rv/Makefile
+++ b/kernel/trace/rv/Makefile
@@ -3,3 +3,4 @@
 obj-$(CONFIG_RV) += rv.o
 obj-$(CONFIG_RV_REACTORS) += rv_reactors.o
 obj-$(CONFIG_RV_MON_WIP) += monitors/wip/wip.o
+obj-$(CONFIG_RV_MON_WWNR) += monitors/wwnr/wwnr.o
diff --git a/kernel/trace/rv/monitors/wwnr/wwnr.c b/kernel/trace/rv/monitors/wwnr/wwnr.c
index 91cb3b70a6a7..cb364a02639b 100644
--- a/kernel/trace/rv/monitors/wwnr/wwnr.c
+++ b/kernel/trace/rv/monitors/wwnr/wwnr.c
@@ -33,39 +33,34 @@ DECLARE_DA_MON_PER_TASK(wwnr, char);
  *
  */
 
-void handle_switch_in(void *data, /* XXX: fill header */)
+static void handle_switch(void *data, bool preempt, struct task_struct *p, struct task_struct *n)
 {
-	pid_t pid = /* XXX how do I get the pid? */;
-	da_handle_event_wwnr(pid, switch_in);
-}
+	int ppid = p->pid;
+	int npid = n->pid;
 
-void handle_switch_out(void *data, /* XXX: fill header */)
-{
-	pid_t pid = /* XXX how do I get the pid? */;
-	da_handle_event_wwnr(pid, switch_out);
+	if (ppid && ppid < MAX_PID)
+		da_handle_init_event_wwnr(ppid, switch_out);
+
+	if (npid && npid < MAX_PID)
+		da_handle_event_wwnr(npid, switch_in);
 }
 
-void handle_wakeup(void *data, /* XXX: fill header */)
+static void handle_wakeup(void *data, struct task_struct *p)
 {
-	pid_t pid = /* XXX how do I get the pid? */;
-	da_handle_event_wwnr(pid, wakeup);
+	if (p->pid && p->pid < MAX_PID)
+		da_handle_event_wwnr(p->pid, wakeup);
 }
 
-#define NR_TP   3
+#define NR_TP	2
 static struct tracepoint_hook_helper tracepoints_to_hook[NR_TP] = {
 	{
-		.probe = handle_switch_in,
-		.name = /* XXX: tracepoint name here */,
-		.registered = 0
-	},
-	{
-		.probe = handle_switch_out,
-		.name = /* XXX: tracepoint name here */,
+		.probe = handle_switch,
+		.name = "sched_switch",
 		.registered = 0
 	},
 	{
 		.probe = handle_wakeup,
-		.name = /* XXX: tracepoint name here */,
+		.name = "sched_wakeup",
 		.registered = 0
 	},
 };
diff --git a/kernel/trace/rv/monitors/wwnr/wwnr.h b/kernel/trace/rv/monitors/wwnr/wwnr.h
index 4af1827d2f16..ed817952821e 100644
--- a/kernel/trace/rv/monitors/wwnr/wwnr.h
+++ b/kernel/trace/rv/monitors/wwnr/wwnr.h
@@ -65,6 +65,6 @@ TRACE_EVENT(error_wwnr,
 
 /* This part ust be outside protection */
 #undef TRACE_INCLUDE_PATH
-#define TRACE_INCLUDE_PATH .
+#define TRACE_INCLUDE_PATH ../kernel/trace/rv/monitors/wwnr/
 #define TRACE_INCLUDE_FILE wwnr
 #include <trace/define_trace.h>
-- 
2.26.2