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x86, bts: add selftest for BTS

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Perform a selftest of branch trace store when a cpu is initialized.

WARN and disable branch trace store support if the selftest fails.

Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
LKML-Reference: <20090313104507.A30125@sedona.ch.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Markus Metzger
2009-03-13 10:45:07 +01:00
committed by Ingo Molnar
parent bc44fb5f7d
commit 8a327f6d1b
5 changed files with 287 additions and 0 deletions
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21
arch/x86/kernel/ds.c
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@@ -29,6 +29,7 @@
#include <linux/mm.h>
#include <linux/kernel.h>
#include "ds_selftest.h"
/*
* The configuration for a particular DS hardware implementation.
@@ -940,6 +941,26 @@ ds_configure(const struct ds_configuration *cfg,
printk(KERN_INFO "[ds] pebs not available\n");
}
if (ds_cfg.sizeof_rec[ds_bts]) {
int error;
error = ds_selftest_bts();
if (error) {
WARN(1, "[ds] selftest failed. disabling bts.\n");
ds_cfg.sizeof_rec[ds_bts] = 0;
}
}
if (ds_cfg.sizeof_rec[ds_pebs]) {
int error;
error = ds_selftest_pebs();
if (error) {
WARN(1, "[ds] selftest failed. disabling pebs.\n");
ds_cfg.sizeof_rec[ds_pebs] = 0;
}
}
printk(KERN_INFO "[ds] sizes: address: %u bit, ",
8 * ds_cfg.sizeof_ptr_field);
printk("bts/pebs record: %u/%u bytes\n",