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From:   kan.liang@linux.intel.com
To:     peterz@infradead.org, mingo@kernel.org,
        linux-kernel@vger.kernel.org
Cc:     acme@kernel.org, tglx@linutronix.de, bp@alien8.de,
        namhyung@kernel.org, jolsa@redhat.com, ak@linux.intel.com,
        yao.jin@linux.intel.com, alexander.shishkin@linux.intel.com,
        adrian.hunter@intel.com, ricardo.neri-calderon@linux.intel.com,
        Kan Liang <kan.liang@linux.intel.com>
Subject: [PATCH V6 18/25] perf/x86/intel: Add attr_update for Hybrid PMUs
Date:   Mon, 12 Apr 2021 07:30:58 -0700
Message-Id: <1618237865-33448-19-git-send-email-kan.liang@linux.intel.com>
In-Reply-To: <1618237865-33448-1-git-send-email-kan.liang@linux.intel.com>
References: <1618237865-33448-1-git-send-email-kan.liang@linux.intel.com>
Precedence: bulk

From: Kan Liang <kan.liang@linux.intel.com>

The attribute_group for Hybrid PMUs should be different from the
previous
cpu PMU. For example, cpumask is required for a Hybrid PMU. The PMU type
should be included in the event and format attribute.

Add hybrid_attr_update for the Hybrid PMU.
Check the PMU type in is_visible() function. Only display the event or
format for the matched Hybrid PMU.

Reviewed-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
---
 arch/x86/events/intel/core.c | 120 ++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 114 insertions(+), 6 deletions(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 4881209..ba24638 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -5118,6 +5118,106 @@ static const struct attribute_group *attr_update[] = {
 	NULL,
 };
 
+static bool is_attr_for_this_pmu(struct kobject *kobj, struct attribute *attr)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct x86_hybrid_pmu *pmu =
+		container_of(dev_get_drvdata(dev), struct x86_hybrid_pmu, pmu);
+	struct perf_pmu_events_hybrid_attr *pmu_attr =
+		container_of(attr, struct perf_pmu_events_hybrid_attr, attr.attr);
+
+	return pmu->cpu_type & pmu_attr->pmu_type;
+}
+
+static umode_t hybrid_events_is_visible(struct kobject *kobj,
+					struct attribute *attr, int i)
+{
+	return is_attr_for_this_pmu(kobj, attr) ? attr->mode : 0;
+}
+
+static inline int hybrid_find_supported_cpu(struct x86_hybrid_pmu *pmu)
+{
+	int cpu = cpumask_first(&pmu->supported_cpus);
+
+	return (cpu >= nr_cpu_ids) ? -1 : cpu;
+}
+
+static umode_t hybrid_tsx_is_visible(struct kobject *kobj,
+				     struct attribute *attr, int i)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct x86_hybrid_pmu *pmu =
+		 container_of(dev_get_drvdata(dev), struct x86_hybrid_pmu, pmu);
+	int cpu = hybrid_find_supported_cpu(pmu);
+
+	return (cpu >= 0) && is_attr_for_this_pmu(kobj, attr) && cpu_has(&cpu_data(cpu), X86_FEATURE_RTM) ? attr->mode : 0;
+}
+
+static umode_t hybrid_format_is_visible(struct kobject *kobj,
+					struct attribute *attr, int i)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct x86_hybrid_pmu *pmu =
+		container_of(dev_get_drvdata(dev), struct x86_hybrid_pmu, pmu);
+	struct perf_pmu_format_hybrid_attr *pmu_attr =
+		container_of(attr, struct perf_pmu_format_hybrid_attr, attr.attr);
+	int cpu = hybrid_find_supported_cpu(pmu);
+
+	return (cpu >= 0) && (pmu->cpu_type & pmu_attr->pmu_type) ? attr->mode : 0;
+}
+
+static struct attribute_group hybrid_group_events_td  = {
+	.name		= "events",
+	.is_visible	= hybrid_events_is_visible,
+};
+
+static struct attribute_group hybrid_group_events_mem = {
+	.name		= "events",
+	.is_visible	= hybrid_events_is_visible,
+};
+
+static struct attribute_group hybrid_group_events_tsx = {
+	.name		= "events",
+	.is_visible	= hybrid_tsx_is_visible,
+};
+
+static struct attribute_group hybrid_group_format_extra = {
+	.name		= "format",
+	.is_visible	= hybrid_format_is_visible,
+};
+
+static ssize_t intel_hybrid_get_attr_cpus(struct device *dev,
+					  struct device_attribute *attr,
+					  char *buf)
+{
+	struct x86_hybrid_pmu *pmu =
+		container_of(dev_get_drvdata(dev), struct x86_hybrid_pmu, pmu);
+
+	return cpumap_print_to_pagebuf(true, buf, &pmu->supported_cpus);
+}
+
+static DEVICE_ATTR(cpus, S_IRUGO, intel_hybrid_get_attr_cpus, NULL);
+static struct attribute *intel_hybrid_cpus_attrs[] = {
+	&dev_attr_cpus.attr,
+	NULL,
+};
+
+static struct attribute_group hybrid_group_cpus = {
+	.attrs		= intel_hybrid_cpus_attrs,
+};
+
+static const struct attribute_group *hybrid_attr_update[] = {
+	&hybrid_group_events_td,
+	&hybrid_group_events_mem,
+	&hybrid_group_events_tsx,
+	&group_caps_gen,
+	&group_caps_lbr,
+	&hybrid_group_format_extra,
+	&group_default,
+	&hybrid_group_cpus,
+	NULL,
+};
+
 static struct attribute *empty_attrs;
 
 static void intel_pmu_check_num_counters(int *num_counters,
@@ -5861,14 +5961,22 @@ __init int intel_pmu_init(void)
 
 	snprintf(pmu_name_str, sizeof(pmu_name_str), "%s", name);
 
+	if (!is_hybrid()) {
+		group_events_td.attrs  = td_attr;
+		group_events_mem.attrs = mem_attr;
+		group_events_tsx.attrs = tsx_attr;
+		group_format_extra.attrs = extra_attr;
+		group_format_extra_skl.attrs = extra_skl_attr;
 
-	group_events_td.attrs  = td_attr;
-	group_events_mem.attrs = mem_attr;
-	group_events_tsx.attrs = tsx_attr;
-	group_format_extra.attrs = extra_attr;
-	group_format_extra_skl.attrs = extra_skl_attr;
+		x86_pmu.attr_update = attr_update;
+	} else {
+		hybrid_group_events_td.attrs  = td_attr;
+		hybrid_group_events_mem.attrs = mem_attr;
+		hybrid_group_events_tsx.attrs = tsx_attr;
+		hybrid_group_format_extra.attrs = extra_attr;
 
-	x86_pmu.attr_update = attr_update;
+		x86_pmu.attr_update = hybrid_attr_update;
+	}
 
 	intel_pmu_check_num_counters(&x86_pmu.num_counters,
 				     &x86_pmu.num_counters_fixed,
-- 
2.7.4