[tip:perf/core] perf/x86: Fix caps/ for !Intel

tip-bot for Peter Zijlstra
2017-08-29T14:26:52Z

Commit-ID: 5da382eb6ea37e2c49ef521c636d73f6ecc3fa81
Gitweb: http://git.kernel.org/tip/5da382eb6ea37e2c49ef521c636d73f6ecc3fa81
Author: Peter Zijlstra <peterz@infradead.org>
AuthorDate: Mon, 28 Aug 2017 12:46:50 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 29 Aug 2017 15:09:25 +0200

perf/x86: Fix caps/ for !Intel

Move the 'max_precise' capability into generic x86 code where it
belongs. This fixes a sysfs splat on !Intel systems where we fail to set
x86_pmu_caps_group.atts.

Reported-and-tested-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: hpa@zytor.com
Fixes: 22688d1c20f5 ("x86/perf: Export some PMU attributes in caps/ directory")
Link: http://lkml.kernel.org/r/20170828104650.2u3rsim4jafyjzv2@hirez.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/events/core.c | 33 ++++++++++++++++++++++++++++-----
arch/x86/events/intel/core.c | 14 ++------------
2 files changed, 30 insertions(+), 17 deletions(-)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index d5f9809..73a6311 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -1757,10 +1757,7 @@ ssize_t x86_event_sysfs_show(char *page, u64 config, u64 event)
}

static struct attribute_group x86_pmu_attr_group;
-
-static struct attribute_group x86_pmu_caps_group = {
- .name = "caps",
-};
+static struct attribute_group x86_pmu_caps_group;

static int __init init_hw_perf_events(void)
{
@@ -1808,7 +1805,14 @@ static int __init init_hw_perf_events(void)
0, x86_pmu.num_counters, 0, 0);

x86_pmu_format_group.attrs = x86_pmu.format_attrs;
- x86_pmu_caps_group.attrs = x86_pmu.caps_attrs;
+
+ if (x86_pmu.caps_attrs) {
+ struct attribute **tmp;
+
+ tmp = merge_attr(x86_pmu_caps_group.attrs, x86_pmu.caps_attrs);
+ if (!WARN_ON(!tmp))
+ x86_pmu_caps_group.attrs = tmp;
+ }

if (x86_pmu.event_attrs)
x86_pmu_events_group.attrs = x86_pmu.event_attrs;
@@ -2224,6 +2228,25 @@ static struct attribute_group x86_pmu_attr_group = {
.attrs = x86_pmu_attrs,
};

+static ssize_t max_precise_show(struct device *cdev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d\n", x86_pmu_max_precise());
+}
+
+static DEVICE_ATTR_RO(max_precise);
+
+static struct attribute *x86_pmu_caps_attrs[] = {
+ &dev_attr_max_precise.attr,
+ NULL
+};
+
+static struct attribute_group x86_pmu_caps_group = {
+ .name = "caps",
+ .attrs = x86_pmu_caps_attrs,
+};
+
static const struct attribute_group *x86_pmu_attr_groups[] = {
&x86_pmu_attr_group,
&x86_pmu_format_group,
diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 8fa2abd..829e89c 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3820,19 +3820,9 @@ static ssize_t pmu_name_show(struct device *cdev,

static DEVICE_ATTR_RO(pmu_name);

-static ssize_t max_precise_show(struct device *cdev,
- struct device_attribute *attr,
- char *buf)
-{
- return snprintf(buf, PAGE_SIZE, "%d\n", x86_pmu_max_precise());
-}
-
-static DEVICE_ATTR_RO(max_precise);
-
static struct attribute *intel_pmu_caps_attrs[] = {
- &dev_attr_pmu_name.attr,
- &dev_attr_max_precise.attr,
- NULL
+ &dev_attr_pmu_name.attr,
+ NULL
};

static struct attribute *intel_pmu_attrs[] = {