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From: Chunyan Zhang <zhang.chunyan@linaro.org>
To: mathieu.poirier@linaro.org, gregkh@linuxfoundation.org
Cc: broonie@kernel.org, serge.broslavsky@linaro.org,
	zhang.lyra@gmail.com, linux-arm-kernel@lists.infradead.org,
	linux-api@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 3/5] Coresight: Add an interface for supporting ETM3/4 Context ID tracing
Date: Tue,  7 Jul 2015 16:41:56 +0800	[thread overview]
Message-ID: <1436258518-9339-4-git-send-email-zhang.chunyan@linaro.org> (raw)
In-Reply-To: <1436258518-9339-1-git-send-email-zhang.chunyan@linaro.org>

If PID namespace is enabled, everytime users configure the Context ID
register to trace the specific process, there needs to be a translation
between the real PID seen from the kernel and VPID seen from the
namespace in which the user's process resides .

This patch just adds the translation interface for ETMs.

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
---
 include/linux/coresight.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 3486b90..626da69 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -248,4 +248,24 @@ static inline struct coresight_platform_data *of_get_coresight_platform_data(
 	struct device *dev, struct device_node *node) { return NULL; }
 #endif
 
+#ifdef CONFIG_PID_NS
+static inline unsigned long
+coresight_vpid_to_pid(unsigned long vpid)
+{
+	struct task_struct *task = NULL;
+	unsigned long pid = 0;
+
+	rcu_read_lock();
+	task = find_task_by_vpid(vpid);
+	if (task)
+		pid = task_pid_nr(task);
+	rcu_read_unlock();
+
+	return pid;
+}
+#else
+static inline unsigned long
+coresight_vpid_to_pid(unsigned long vpid) { return vpid; }
+#endif
+
 #endif
-- 
1.9.1


WARNING: multiple messages have this Message-ID (diff)
From: Chunyan Zhang <zhang.chunyan-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
To: mathieu.poirier-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org,
	gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org
Cc: broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
	serge.broslavsky-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org,
	zhang.lyra-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [PATCH 3/5] Coresight: Add an interface for supporting ETM3/4 Context ID tracing
Date: Tue,  7 Jul 2015 16:41:56 +0800	[thread overview]
Message-ID: <1436258518-9339-4-git-send-email-zhang.chunyan@linaro.org> (raw)
In-Reply-To: <1436258518-9339-1-git-send-email-zhang.chunyan-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>

If PID namespace is enabled, everytime users configure the Context ID
register to trace the specific process, there needs to be a translation
between the real PID seen from the kernel and VPID seen from the
namespace in which the user's process resides .

This patch just adds the translation interface for ETMs.

Signed-off-by: Chunyan Zhang <zhang.chunyan-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
---
 include/linux/coresight.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 3486b90..626da69 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -248,4 +248,24 @@ static inline struct coresight_platform_data *of_get_coresight_platform_data(
 	struct device *dev, struct device_node *node) { return NULL; }
 #endif
 
+#ifdef CONFIG_PID_NS
+static inline unsigned long
+coresight_vpid_to_pid(unsigned long vpid)
+{
+	struct task_struct *task = NULL;
+	unsigned long pid = 0;
+
+	rcu_read_lock();
+	task = find_task_by_vpid(vpid);
+	if (task)
+		pid = task_pid_nr(task);
+	rcu_read_unlock();
+
+	return pid;
+}
+#else
+static inline unsigned long
+coresight_vpid_to_pid(unsigned long vpid) { return vpid; }
+#endif
+
 #endif
-- 
1.9.1

WARNING: multiple messages have this Message-ID (diff)
From: zhang.chunyan@linaro.org (Chunyan Zhang)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 3/5] Coresight: Add an interface for supporting ETM3/4 Context ID tracing
Date: Tue,  7 Jul 2015 16:41:56 +0800	[thread overview]
Message-ID: <1436258518-9339-4-git-send-email-zhang.chunyan@linaro.org> (raw)
In-Reply-To: <1436258518-9339-1-git-send-email-zhang.chunyan@linaro.org>

If PID namespace is enabled, everytime users configure the Context ID
register to trace the specific process, there needs to be a translation
between the real PID seen from the kernel and VPID seen from the
namespace in which the user's process resides .

This patch just adds the translation interface for ETMs.

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
---
 include/linux/coresight.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 3486b90..626da69 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -248,4 +248,24 @@ static inline struct coresight_platform_data *of_get_coresight_platform_data(
 	struct device *dev, struct device_node *node) { return NULL; }
 #endif
 
+#ifdef CONFIG_PID_NS
+static inline unsigned long
+coresight_vpid_to_pid(unsigned long vpid)
+{
+	struct task_struct *task = NULL;
+	unsigned long pid = 0;
+
+	rcu_read_lock();
+	task = find_task_by_vpid(vpid);
+	if (task)
+		pid = task_pid_nr(task);
+	rcu_read_unlock();
+
+	return pid;
+}
+#else
+static inline unsigned long
+coresight_vpid_to_pid(unsigned long vpid) { return vpid; }
+#endif
+
 #endif
-- 
1.9.1

  parent reply	other threads:[~2015-07-07  8:44 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-07-07  8:41 [PATCH 0/5] coresight: Support context-ID tracing when PID namespace is enabled Chunyan Zhang
2015-07-07  8:41 ` Chunyan Zhang
2015-07-07  8:41 ` Chunyan Zhang
2015-07-07  8:41 ` [PATCH 1/5] coresight-etm3x: Change the name of the ctxid_val to ctxid_pid Chunyan Zhang
2015-07-07  8:41   ` Chunyan Zhang
2015-07-07  8:41   ` Chunyan Zhang
2015-07-07  8:41 ` [PATCH 2/5] coresight-etm4x: " Chunyan Zhang
2015-07-07  8:41   ` Chunyan Zhang
2015-07-07  8:41   ` Chunyan Zhang
2015-08-26 17:57   ` Christopher Covington
2015-08-26 17:57     ` Christopher Covington
2015-08-26 17:57     ` Christopher Covington
2015-08-27 15:12     ` Mathieu Poirier
2015-08-27 15:12       ` Mathieu Poirier
2015-08-27 15:12       ` Mathieu Poirier
2015-08-27 15:33       ` Christopher Covington
2015-08-27 15:33         ` Christopher Covington
2015-08-27 15:33         ` Christopher Covington
2015-08-27 15:54         ` Mathieu Poirier
2015-08-27 15:54           ` Mathieu Poirier
2015-08-27 15:54           ` Mathieu Poirier
2015-07-07  8:41 ` Chunyan Zhang [this message]
2015-07-07  8:41   ` [PATCH 3/5] Coresight: Add an interface for supporting ETM3/4 Context ID tracing Chunyan Zhang
2015-07-07  8:41   ` Chunyan Zhang
2015-07-07  8:41 ` [PATCH 4/5] coresight-etm3x: Support context-ID tracing when PID namespace is enabled Chunyan Zhang
2015-07-07  8:41   ` Chunyan Zhang
2015-07-07  8:41   ` Chunyan Zhang
2015-07-07  8:41 ` [PATCH 5/5] coresight-etm4x: " Chunyan Zhang
2015-07-07  8:41   ` Chunyan Zhang
2015-07-07  8:41   ` Chunyan Zhang
2015-07-13 17:26 ` [PATCH 0/5] coresight: " Mathieu Poirier
2015-07-13 17:26   ` Mathieu Poirier
2015-07-13 17:26   ` Mathieu Poirier

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