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authorMarkus Metzger <markus.t.metzger@intel.com>2009-03-13 10:45:07 +0100
committerIngo Molnar <mingo@elte.hu>2009-03-13 11:57:20 +0100
commit8a327f6d1b05f5ce16572b4413a5df1d0e872283 (patch)
tree7903a0b4725bea86dba942003d5f6048077271d0 /arch/x86/kernel/ds.c
parentbc44fb5f7d3e764ed7698c835a1a0f35aba2eb3d (diff)
downloadop-kernel-dev-8a327f6d1b05f5ce16572b4413a5df1d0e872283.zip
op-kernel-dev-8a327f6d1b05f5ce16572b4413a5df1d0e872283.tar.gz
x86, bts: add selftest for BTS
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>
Diffstat (limited to 'arch/x86/kernel/ds.c')
-rw-r--r--arch/x86/kernel/ds.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/x86/kernel/ds.c b/arch/x86/kernel/ds.c
index 6e5ec67..51c936c 100644
--- a/arch/x86/kernel/ds.c
+++ b/arch/x86/kernel/ds.c
@@ -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",
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