Add selftests to cover per-task branch tracing.
Signed-off-by: Markus Metzger <[email protected]>
---
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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