From dad559d4944b220a84b2d57657fb7ba2363f66f1 Mon Sep 17 00:00:00 2001
From: Markus Metzger <markus.t.metzger@intel.com>
Date: Fri, 3 Apr 2009 16:43:45 +0200
Subject: [PATCH] --- yaml --- r: 146132 b: refs/heads/master c:
 3a68eef945b234f286406d96dc690fe17863c203 h: refs/heads/master v: v3

---
 [refs]                              |  2 +-
 trunk/arch/x86/kernel/ds_selftest.c | 71 +++++++++++++++++++++++++++++
 2 files changed, 72 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 781e9cdf567e..ce71a619bd7a 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 01f6569ece6915616f6cae1d7d8b46ab8da9c1bd
+refs/heads/master: 3a68eef945b234f286406d96dc690fe17863c203
diff --git a/trunk/arch/x86/kernel/ds_selftest.c b/trunk/arch/x86/kernel/ds_selftest.c
index 599a96300628..a40b2533c71e 100644
--- a/trunk/arch/x86/kernel/ds_selftest.c
+++ b/trunk/arch/x86/kernel/ds_selftest.c
@@ -280,10 +280,51 @@ static int ds_selftest_bts_bad_release_noirq(int cpu,
 	return error ? 0 : -1;
 }
 
+static int ds_selftest_bts_bad_request_cpu(int cpu, void *buffer)
+{
+	struct bts_tracer *tracer;
+	int error;
+
+	/* Try to request cpu tracing while task tracing is active. */
+	tracer = ds_request_bts_cpu(cpu, buffer, BUFFER_SIZE, NULL,
+				    (size_t)-1, BTS_KERNEL);
+	error = PTR_ERR(tracer);
+	if (!IS_ERR(tracer)) {
+		ds_release_bts(tracer);
+		error = 0;
+	}
+
+	if (error != -EPERM)
+		printk(KERN_CONT "cpu/task tracing overlap...");
+
+	return error ? 0 : -1;
+}
+
+static int ds_selftest_bts_bad_request_task(void *buffer)
+{
+	struct bts_tracer *tracer;
+	int error;
+
+	/* Try to request cpu tracing while task tracing is active. */
+	tracer = ds_request_bts_task(current, buffer, BUFFER_SIZE, NULL,
+				    (size_t)-1, BTS_KERNEL);
+	error = PTR_ERR(tracer);
+	if (!IS_ERR(tracer)) {
+		error = 0;
+		ds_release_bts(tracer);
+	}
+
+	if (error != -EPERM)
+		printk(KERN_CONT "task/cpu tracing overlap...");
+
+	return error ? 0 : -1;
+}
+
 int ds_selftest_bts(void)
 {
 	struct ds_selftest_bts_conf conf;
 	unsigned char buffer[BUFFER_SIZE];
+	unsigned long irq;
 	int cpu;
 
 	printk(KERN_INFO "[ds] bts selftest...");
@@ -297,6 +338,8 @@ int ds_selftest_bts(void)
 			ds_request_bts_cpu(cpu, buffer, BUFFER_SIZE,
 					   NULL, (size_t)-1, BTS_KERNEL);
 		ds_selftest_bts_cpu(&conf);
+		if (conf.error >= 0)
+			conf.error = ds_selftest_bts_bad_request_task(buffer);
 		ds_release_bts(conf.tracer);
 		if (conf.error < 0)
 			goto out;
@@ -315,12 +358,40 @@ int ds_selftest_bts(void)
 			if (conf.error < 0)
 				conf.tracer = NULL;
 		}
+		if (conf.error >= 0)
+			conf.error = ds_selftest_bts_bad_request_task(buffer);
 		smp_call_function_single(cpu, ds_release_bts_noirq_wrap,
 					 conf.tracer, 1);
 		if (conf.error < 0)
 			goto out;
 	}
 
+	conf.suspend = ds_suspend_bts_wrap;
+	conf.resume = ds_resume_bts_wrap;
+	conf.tracer =
+		ds_request_bts_task(current, buffer, BUFFER_SIZE,
+				    NULL, (size_t)-1, BTS_KERNEL);
+	ds_selftest_bts_cpu(&conf);
+	if (conf.error >= 0)
+		conf.error = ds_selftest_bts_bad_request_cpu(0, buffer);
+	ds_release_bts(conf.tracer);
+	if (conf.error < 0)
+		goto out;
+
+	conf.suspend = ds_suspend_bts_noirq;
+	conf.resume = ds_resume_bts_noirq;
+	conf.tracer =
+		ds_request_bts_task(current, buffer, BUFFER_SIZE,
+				   NULL, (size_t)-1, BTS_KERNEL);
+	local_irq_save(irq);
+	ds_selftest_bts_cpu(&conf);
+	if (conf.error >= 0)
+		conf.error = ds_selftest_bts_bad_request_cpu(0, buffer);
+	ds_release_bts_noirq(conf.tracer);
+	local_irq_restore(irq);
+	if (conf.error < 0)
+		goto out;
+
 	conf.error = 0;
  out:
 	put_online_cpus();