Commit-ID: 53ed74af05517cf5fe83d87c4bb7ab998adfd631
Gitweb: https://git.kernel.org/tip/53ed74af05517cf5fe83d87c4bb7ab998adfd631
Author: Reinette Chatre <reinette.cha...@intel.com>
AuthorDate: Wed, 19 Sep 2018 10:29:11 -0700
Committer: Thomas Gleixner <t...@linutronix.de>
CommitDate: Wed, 3 Oct 2018 21:53:35 +0200
x86/intel_rdt: Re-enable pseudo-lock measurements
Commit 4a7a54a55e72 ("x86/intel_rdt: Disable PMU access") disabled
measurements of pseudo-locked regions because of incorrect usage
of the performance monitoring hardware.
Cache pseudo-locking measurements are now done correctly with the
in-kernel perf API and its use can be re-enabled at this time.
The adjustment to the in-kernel perf API also separated the L2 and L3
measurements that can be triggered separately from user space. The
re-enabling of the measurements is thus not a simple revert of the
original disable in order to accommodate the additional parameter
possible.
Signed-off-by: Reinette Chatre <reinette.cha...@intel.com>
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Cc: fenghua...@intel.com
Cc: tony.l...@intel.com
Cc: pet...@infradead.org
Cc: a...@kernel.org
Cc: gavin.hind...@intel.com
Cc: jithu.jos...@intel.com
Cc: dave.han...@intel.com
Cc: h...@zytor.com
Link:
https://lkml.kernel.org/r/bfb9fc31692e0c62d9ca39062e55eceb6a0635b5.1537377064.git.reinette.cha...@intel.com
---
arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c
b/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c
index d68836139cf9..30e6c9f5a0ad 100644
--- a/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c
+++ b/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c
@@ -1236,7 +1236,7 @@ static ssize_t pseudo_lock_measure_trigger(struct file
*file,
buf[buf_size] = '\0';
ret = kstrtoint(buf, 10, &sel);
if (ret == 0) {
- if (sel != 1)
+ if (sel != 1 && sel != 2 && sel != 3)
return -EINVAL;
ret = debugfs_file_get(file->f_path.dentry);
if (ret)
