From: Tingwei Zhang <tingwei@codeaurora.org>
To: Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@st.com>
Cc: tsoni@codeaurora.org,
Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Mao Jinlong <jinlmao@codeaurora.org>,
linux-kernel@vger.kernel.org,
Tingwei Zhang <tingwei@codeaurora.org>,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 6/6] stm class: ftrace: use different channel accroding to CPU
Date: Thu, 3 Sep 2020 08:17:06 +0800 [thread overview]
Message-ID: <20200903001706.28147-7-tingwei@codeaurora.org> (raw)
In-Reply-To: <20200903001706.28147-1-tingwei@codeaurora.org>
To avoid mixup of packets from differnt ftrace packets simultaneously,
use different channel for packets from different CPU.
Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
drivers/hwtracing/stm/ftrace.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/hwtracing/stm/ftrace.c b/drivers/hwtracing/stm/ftrace.c
index c694a6e692d1..ebf29489919c 100644
--- a/drivers/hwtracing/stm/ftrace.c
+++ b/drivers/hwtracing/stm/ftrace.c
@@ -37,8 +37,10 @@ static void notrace
stm_ftrace_write(struct trace_export *export, const void *buf, unsigned int len)
{
struct stm_ftrace *stm = container_of(export, struct stm_ftrace, ftrace);
+ /* This is called from trace system with preemption disabled */
+ unsigned int cpu = smp_processor_id();
- stm_source_write(&stm->data, STM_FTRACE_CHAN, buf, len);
+ stm_source_write(&stm->data, STM_FTRACE_CHAN + cpu, buf, len);
}
static int stm_ftrace_link(struct stm_source_data *data)
@@ -63,6 +65,7 @@ static int __init stm_ftrace_init(void)
{
int ret;
+ stm_ftrace.data.nr_chans = num_possible_cpus();
ret = stm_source_register_device(NULL, &stm_ftrace.data);
if (ret)
pr_err("Failed to register stm_source - ftrace.\n");
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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WARNING: multiple messages have this Message-ID (diff)
From: Tingwei Zhang <tingwei@codeaurora.org>
To: Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@st.com>
Cc: Tingwei Zhang <tingwei@codeaurora.org>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
tsoni@codeaurora.org,
Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>,
Mao Jinlong <jinlmao@codeaurora.org>,
linux-kernel@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 6/6] stm class: ftrace: use different channel accroding to CPU
Date: Thu, 3 Sep 2020 08:17:06 +0800 [thread overview]
Message-ID: <20200903001706.28147-7-tingwei@codeaurora.org> (raw)
In-Reply-To: <20200903001706.28147-1-tingwei@codeaurora.org>
To avoid mixup of packets from differnt ftrace packets simultaneously,
use different channel for packets from different CPU.
Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
drivers/hwtracing/stm/ftrace.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/hwtracing/stm/ftrace.c b/drivers/hwtracing/stm/ftrace.c
index c694a6e692d1..ebf29489919c 100644
--- a/drivers/hwtracing/stm/ftrace.c
+++ b/drivers/hwtracing/stm/ftrace.c
@@ -37,8 +37,10 @@ static void notrace
stm_ftrace_write(struct trace_export *export, const void *buf, unsigned int len)
{
struct stm_ftrace *stm = container_of(export, struct stm_ftrace, ftrace);
+ /* This is called from trace system with preemption disabled */
+ unsigned int cpu = smp_processor_id();
- stm_source_write(&stm->data, STM_FTRACE_CHAN, buf, len);
+ stm_source_write(&stm->data, STM_FTRACE_CHAN + cpu, buf, len);
}
static int stm_ftrace_link(struct stm_source_data *data)
@@ -63,6 +65,7 @@ static int __init stm_ftrace_init(void)
{
int ret;
+ stm_ftrace.data.nr_chans = num_possible_cpus();
ret = stm_source_register_device(NULL, &stm_ftrace.data);
if (ret)
pr_err("Failed to register stm_source - ftrace.\n");
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2020-09-03 0:19 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-03 0:17 [PATCH v3 0/6] tracing: export event trace and trace_marker Tingwei Zhang
2020-09-03 0:17 ` Tingwei Zhang
2020-09-03 0:17 ` [PATCH v3 1/6] stm class: ftrace: change dependency to TRACING Tingwei Zhang
2020-09-03 0:17 ` Tingwei Zhang
2020-09-03 0:17 ` [PATCH v3 2/6] tracing: add flag to control different traces Tingwei Zhang
2020-09-03 0:17 ` Tingwei Zhang
2020-09-03 0:17 ` [PATCH v3 3/6] tracing: add trace_export support for event trace Tingwei Zhang
2020-09-03 0:17 ` Tingwei Zhang
2020-09-03 0:17 ` [PATCH v3 4/6] tracing: add trace_export support for trace_marker Tingwei Zhang
2020-09-03 0:17 ` Tingwei Zhang
2020-09-03 0:17 ` [PATCH v3 5/6] stm class: ftrace: enable supported trace export flag Tingwei Zhang
2020-09-03 0:17 ` Tingwei Zhang
2020-09-03 0:17 ` Tingwei Zhang [this message]
2020-09-03 0:17 ` [PATCH v3 6/6] stm class: ftrace: use different channel accroding to CPU Tingwei Zhang
2020-09-18 12:45 ` Alexander Shishkin
2020-09-18 12:45 ` Alexander Shishkin
2020-09-23 4:39 ` Tingwei Zhang
2020-09-23 4:39 ` Tingwei Zhang
2020-09-14 23:27 ` [PATCH v3 0/6] tracing: export event trace and trace_marker Tingwei Zhang
2020-09-14 23:27 ` Tingwei Zhang
2020-09-18 14:26 ` Alexander Shishkin
2020-09-18 14:26 ` Alexander Shishkin
-- strict thread matches above, loose matches on Subject: below --
2020-08-13 1:45 Tingwei Zhang
2020-08-13 1:45 ` [PATCH v3 6/6] stm class: ftrace: use different channel accroding to CPU Tingwei Zhang
2020-08-11 3:57 [PATCH v3 0/6] tracing: export event trace and trace_marker Tingwei Zhang
2020-08-11 3:57 ` [PATCH v3 6/6] stm class: ftrace: use different channel accroding to CPU Tingwei Zhang
2020-07-28 1:33 [PATCH v3 0/6] tracing: export event trace and trace_marker Tingwei Zhang
2020-07-28 1:33 ` [PATCH v3 6/6] stm class: ftrace: use different channel accroding to CPU Tingwei Zhang
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