agent: make panic on delay configurable

Adds additional functionality to system agent that allows
to enable and disable panic on delay when necessary.

Signed-off-by: Tomasz Lauda <tomasz.lauda@linux.intel.com>

src/include/sof/lib/agent.h

@@ -8,8 +8,11 @@
 #ifndef __SOF_LIB_AGENT_H__
 #define __SOF_LIB_AGENT_H__
 
+#include <sof/atomic.h>
+#include <sof/lib/memory.h>
 #include <sof/lib/perf_cnt.h>
 #include <sof/schedule/task.h>
+#include <sof/sof.h>
 #include <config.h>
 #include <stdbool.h>
 #include <stdint.h>
@@ -25,15 +28,37 @@ struct sa {
 	struct perf_cnt_data pcd;
 #endif
 	struct task work;
+	atomic_t panic_cnt;	/**< ref counter for panic_on_delay property */
+	bool panic_on_delay;	/**< emits panic on delay if true */
 };
 
 #if CONFIG_HAVE_AGENT
 
+/**
+ * Enables or disables panic on agent delay.
+ * @param enabled True for panic enabling, false otherwise.
+ */
+static inline void sa_set_panic_on_delay(bool enabled)
+{
+	struct sa *sa = sof_get()->sa;
+
+	if (enabled)
+		atomic_add(&sa->panic_cnt, 1);
+	else
+		atomic_sub(&sa->panic_cnt, 1);
+
+	/* enable panic only if no refs */
+	sa->panic_on_delay = !atomic_read(&sa->panic_cnt);
+
+	platform_shared_commit(sa, sizeof(*sa));
+}
+
 void sa_init(struct sof *sof, uint64_t timeout);
 
 #else
 
 static inline void sa_init(struct sof *sof, uint64_t timeout) { }
+static inline void sa_set_panic_on_delay(bool enabled) { }
 
 #endif
 

src/lib/agent.c

@@ -29,6 +29,7 @@
 #include <ipc/topology.h>
 #include <ipc/trace.h>
 #include <user/trace.h>
+#include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ -60,7 +61,7 @@ static enum task_state validate(void *data)
 	perf_cnt_stamp(&sa->pcd, perf_sa_trace, sa);
 
 	/* panic timeout */
-	if (delta > sa->panic_timeout)
+	if (sa->panic_on_delay && delta > sa->panic_timeout)
 		panic(SOF_IPC_PANIC_IDLE);
 
 	/* warning timeout */
@@ -92,6 +93,9 @@ void sa_init(struct sof *sof, uint64_t timeout)
 	sof->sa->panic_timeout = 2 * ticks;	/* 100% delay */
 	sof->sa->warn_timeout = ticks + ticks / 20;	/* 5% delay */
 
+	atomic_init(&sof->sa->panic_cnt, 0);
+	sof->sa->panic_on_delay = true;
+
 	trace_sa("sa_init(), ticks = %u, sof->sa->warn_timeout = %u, sof->sa->panic_timeout = %u",
 		 ticks, sof->sa->warn_timeout, sof->sa->panic_timeout);