[Cbe-oss-dev] [PATCH 5/5]MARS/base: kernel fix idle signal

[Yuji Mano]

This patch is a fix to a kernel bug that causes the kernel to remain in the idle
wait state even when another MPU has sent a new signal to a workload that should
cause it to change state.

Signed-off-by: Yuji Mano <yuji.mano at am.sony.com>
---
 base/src/mpu/kernel/kernel.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/base/src/mpu/kernel/kernel.c
+++ b/base/src/mpu/kernel/kernel.c
@@ -53,6 +53,7 @@
 #define MARS_KERNEL_STATUS_BUSY				0x4
 #define MARS_KERNEL_STATUS_RETRY			0x8
 
+#define MARS_KERNEL_UPDATE_HEADER_BITS_ACCESS		0x0
 #define MARS_KERNEL_UPDATE_HEADER_BITS_STATE		0x1
 #define MARS_KERNEL_UPDATE_HEADER_BITS_COUNTER		0x2
 #define MARS_KERNEL_UPDATE_HEADER_BITS_COUNTER_RESET	0x4
@@ -243,7 +244,7 @@ static void update_header_bits(int mode,
 		MARS_BITS_SET(block_bits, BLOCK_WAITING, block_waiting);
 		MARS_BITS_SET(block_bits, BLOCK_PRIORITY, block_priority);
 	/* update header bits counter */
-	} else {
+	} else if (mode) {
 		/* reset is not specified so increment current block counter */
 		if (mode & MARS_KERNEL_UPDATE_HEADER_BITS_COUNTER) {
 			block_counter =
@@ -399,6 +400,9 @@ static uint64_t set_signal_bits(uint64_t
 {
 	MARS_BITS_SET(&bits, WORKLOAD_SIGNAL, signal);
 
+	/* update queue header bits access in case kernel is idle */
+	update_header_bits(MARS_KERNEL_UPDATE_HEADER_BITS_ACCESS, 0);
+
 	return bits;
 }