s390/cpumf: Adjust registration of s390 PMU device drivers

[ Upstream commit 6a82e23f45fe0aa821e7a935e39d0acb20c275c0 ]

Linux-next commit titled "perf/core: Optimize perf_init_event()"
changed the semantics of PMU device driver registration.
It was done to speed up the lookup/handling of PMU device driver
specific events. It also enforces that only one PMU device
driver will be registered of type PERF_EVENT_RAW.

This change added these line in function perf_pmu_register():

  ...
  +       ret = idr_alloc(&pmu_idr, pmu, max, 0, GFP_KERNEL);
  +       if (ret < 0)
                goto free_pdc;
  +
  +       WARN_ON(type >= 0 && ret != type);

The warn_on generates a message. We have 3 PMU device drivers,
each registered as type PERF_TYPE_RAW.
The cf_diag device driver (arch/s390/kernel/perf_cpumf_cf_diag.c)
always hits the WARN_ON because it is the second PMU device driver
(after sampling device driver arch/s390/kernel/perf_cpumf_sf.c)
which is registered as type 4 (PERF_TYPE_RAW).
So when the sampling device driver is registered, ret has value 4.
When cf_diag device driver is registered with type 4,
ret has value of 5 and WARN_ON fires.

Adjust the PMU device drivers for s390 to support the new
semantics required by perf_pmu_register().

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/s390/kernel/perf_cpum_cf.c b/arch/s390/kernel/perf_cpum_cf.c
index 48d48b6187c0d720bff1cbd836d5233455658ed5..0eb1d1cc53a88380421468f5daa6ec1f842328e2 100644 (file)
--- a/arch/s390/kernel/perf_cpum_cf.c
+++ b/arch/s390/kernel/perf_cpum_cf.c
@@ -199,7 +199,7 @@ static const int cpumf_generic_events_user[] = {
        [PERF_COUNT_HW_BUS_CYCLES]          = -1,
 };
 
-static int __hw_perf_event_init(struct perf_event *event)
+static int __hw_perf_event_init(struct perf_event *event, unsigned int type)
 {
        struct perf_event_attr *attr = &event->attr;
        struct hw_perf_event *hwc = &event->hw;
@@ -207,7 +207,7 @@ static int __hw_perf_event_init(struct perf_event *event)
        int err = 0;
        u64 ev;
 
-       switch (attr->type) {
+       switch (type) {
        case PERF_TYPE_RAW:
                /* Raw events are used to access counters directly,
                 * hence do not permit excludes */
@@ -294,17 +294,16 @@ static int __hw_perf_event_init(struct perf_event *event)
 
 static int cpumf_pmu_event_init(struct perf_event *event)
 {
+       unsigned int type = event->attr.type;
        int err;
 
-       switch (event->attr.type) {
-       case PERF_TYPE_HARDWARE:
-       case PERF_TYPE_HW_CACHE:
-       case PERF_TYPE_RAW:
-               err = __hw_perf_event_init(event);
-               break;
-       default:
+       if (type == PERF_TYPE_HARDWARE || type == PERF_TYPE_RAW)
+               err = __hw_perf_event_init(event, type);
+       else if (event->pmu->type == type)
+               /* Registered as unknown PMU */
+               err = __hw_perf_event_init(event, PERF_TYPE_RAW);
+       else
                return -ENOENT;
-       }
 
        if (unlikely(err) && event->destroy)
                event->destroy(event);
@@ -553,7 +552,7 @@ static int __init cpumf_pmu_init(void)
                return -ENODEV;
 
        cpumf_pmu.attr_groups = cpumf_cf_event_group();
-       rc = perf_pmu_register(&cpumf_pmu, "cpum_cf", PERF_TYPE_RAW);
+       rc = perf_pmu_register(&cpumf_pmu, "cpum_cf", -1);
        if (rc)
                pr_err("Registering the cpum_cf PMU failed with rc=%i\n", rc);
        return rc;

diff --git a/arch/s390/kernel/perf_cpum_cf_diag.c b/arch/s390/kernel/perf_cpum_cf_diag.c
index 2654e348801a1269998ee344df5eed1eb1658e51..e949ab832ed759bd237f78cca12c8ca83fe6a384 100644 (file)
--- a/arch/s390/kernel/perf_cpum_cf_diag.c
+++ b/arch/s390/kernel/perf_cpum_cf_diag.c
@@ -243,13 +243,13 @@ static int cf_diag_event_init(struct perf_event *event)
        int err = -ENOENT;
 
        debug_sprintf_event(cf_diag_dbg, 5,
-                           "%s event %p cpu %d config %#llx "
+                           "%s event %p cpu %d config %#llx type:%u "
                            "sample_type %#llx cf_diag_events %d\n", __func__,
-                           event, event->cpu, attr->config, attr->sample_type,
-                           atomic_read(&cf_diag_events));
+                           event, event->cpu, attr->config, event->pmu->type,
+                           attr->sample_type, atomic_read(&cf_diag_events));
 
        if (event->attr.config != PERF_EVENT_CPUM_CF_DIAG ||
-           event->attr.type != PERF_TYPE_RAW)
+           event->attr.type != event->pmu->type)
                goto out;
 
        /* Raw events are used to access counters directly,
@@ -693,7 +693,7 @@ static int __init cf_diag_init(void)
        }
        debug_register_view(cf_diag_dbg, &debug_sprintf_view);
 
-       rc = perf_pmu_register(&cf_diag, "cpum_cf_diag", PERF_TYPE_RAW);
+       rc = perf_pmu_register(&cf_diag, "cpum_cf_diag", -1);
        if (rc) {
                debug_unregister_view(cf_diag_dbg, &debug_sprintf_view);
                debug_unregister(cf_diag_dbg);