linux-kernel - [patch 15/21] x86, ds: add task tracing selftest

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Date:	Tue, 31 Mar 2009 15:33:08 +0200
From:	Markus Metzger <markus.t.metzger@...el.com>
To:	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	hpa@...or.com
Cc:	markus.t.metzger@...el.com, markus.t.metzger@...il.com,
	roland@...hat.com, eranian@...glemail.com, oleg@...hat.com,
	juan.villacis@...el.com, ak@...ux.jf.intel.com
Subject: [patch 15/21] x86, ds: add task tracing selftest

Add selftests to cover per-task branch tracing.


Signed-off-by: Markus Metzger <markus.t.metzger@...el.com>
---

Index: git-tip/arch/x86/kernel/ds_selftest.c
===================================================================
--- git-tip.orig/arch/x86/kernel/ds_selftest.c	2009-03-31 08:59:34.000000000 +0200
+++ git-tip/arch/x86/kernel/ds_selftest.c	2009-03-31 11:18:33.000000000 +0200
@@ -280,10 +280,51 @@ static int ds_selftest_bts_bad_release_n
 	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();
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