linux-kernel - [PATCH 02/16] coresight: stm: Support marked packet

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Message-Id: <20200916191737.4001561-3-mathieu.poirier@linaro.org>
Date:   Wed, 16 Sep 2020 13:17:23 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 02/16] coresight: stm: Support marked packet

From: Tingwei Zhang <tingwei@...eaurora.org>

STP_PACKET_MARKED is not supported by STM currently.
Add STM_FLAG_MARKED to support marked packet in STM.

Signed-off-by: Tingwei Zhang <tingwei@...eaurora.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 drivers/hwtracing/coresight/coresight-stm.c | 11 +++++++----
 include/uapi/linux/coresight-stm.h          |  1 +
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
index 673d2f56ed1e..2ba819a47cf6 100644
--- a/drivers/hwtracing/coresight/coresight-stm.c
+++ b/drivers/hwtracing/coresight/coresight-stm.c
@@ -412,6 +412,7 @@ static ssize_t notrace stm_generic_packet(struct stm_data *stm_data,
 	void __iomem *ch_addr;
 	struct stm_drvdata *drvdata = container_of(stm_data,
 						   struct stm_drvdata, stm);
+	unsigned int stm_flags;
 
 	if (!(drvdata && local_read(&drvdata->mode)))
 		return -EACCES;
@@ -421,8 +422,9 @@ static ssize_t notrace stm_generic_packet(struct stm_data *stm_data,
 
 	ch_addr = stm_channel_addr(drvdata, channel);
 
-	flags = (flags == STP_PACKET_TIMESTAMPED) ? STM_FLAG_TIMESTAMPED : 0;
-	flags |= test_bit(channel, drvdata->chs.guaranteed) ?
+	stm_flags = (flags & STP_PACKET_TIMESTAMPED) ?
+			STM_FLAG_TIMESTAMPED : 0;
+	stm_flags |= test_bit(channel, drvdata->chs.guaranteed) ?
 			   STM_FLAG_GUARANTEED : 0;
 
 	if (size > drvdata->write_bytes)
@@ -432,7 +434,7 @@ static ssize_t notrace stm_generic_packet(struct stm_data *stm_data,
 
 	switch (packet) {
 	case STP_PACKET_FLAG:
-		ch_addr += stm_channel_off(STM_PKT_TYPE_FLAG, flags);
+		ch_addr += stm_channel_off(STM_PKT_TYPE_FLAG, stm_flags);
 
 		/*
 		 * The generic STM core sets a size of '0' on flag packets.
@@ -444,7 +446,8 @@ static ssize_t notrace stm_generic_packet(struct stm_data *stm_data,
 		break;
 
 	case STP_PACKET_DATA:
-		ch_addr += stm_channel_off(STM_PKT_TYPE_DATA, flags);
+		stm_flags |= (flags & STP_PACKET_MARKED) ? STM_FLAG_MARKED : 0;
+		ch_addr += stm_channel_off(STM_PKT_TYPE_DATA, stm_flags);
 		stm_send(ch_addr, payload, size,
 				drvdata->write_bytes);
 		break;
diff --git a/include/uapi/linux/coresight-stm.h b/include/uapi/linux/coresight-stm.h
index 8847dbf24151..7ff3709c01b8 100644
--- a/include/uapi/linux/coresight-stm.h
+++ b/include/uapi/linux/coresight-stm.h
@@ -5,6 +5,7 @@
 #include <linux/const.h>
 
 #define STM_FLAG_TIMESTAMPED   _BITUL(3)
+#define STM_FLAG_MARKED        _BITUL(4)
 #define STM_FLAG_GUARANTEED    _BITUL(7)
 
 /*
-- 
2.25.1