lkml.org 
[lkml]   [2020]   [Sep]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 02/16] coresight: stm: Support marked packet
Date
From: Tingwei Zhang <tingwei@codeaurora.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@codeaurora.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.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
\
 
 \ /
  Last update: 2020-09-16 21:46    [W:0.080 / U:0.932 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site