diff options
| author | Markus Metzger <markus.t.metzger@intel.com> | 2009-03-13 10:45:07 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-13 11:57:20 +0100 |
| commit | 8a327f6d1b05f5ce16572b4413a5df1d0e872283 (patch) | |
| tree | 7903a0b4725bea86dba942003d5f6048077271d0 /arch/x86/kernel/ds.c | |
| parent | bc44fb5f7d3e764ed7698c835a1a0f35aba2eb3d (diff) | |
| download | op-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.c | 21 |
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", |
