drivers/perf: hisi: Add identifier sysfs file

To allow userspace to identify the specific implementation of the device,
add an "identifier" sysfs file.

Encoding is as follows (same for all uncore drivers):
hi1620: 0x0
hi1630: 0x30
Signed-off-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1602149181-237415-2-git-send-email-john.garry@huawei.comSigned-off-by: Will Deacon <will@kernel.org>

drivers/perf/hisilicon/hisi_uncore_ddrc_pmu.c

@@ -33,6 +33,7 @@
 #define DDRC_INT_MASK		0x6c8
 #define DDRC_INT_STATUS		0x6cc
 #define DDRC_INT_CLEAR		0x6d0
+#define DDRC_VERSION		0x710
 
 /* DDRC has 8-counters */
 #define DDRC_NR_COUNTERS	0x8
@@ -267,6 +268,8 @@ static int hisi_ddrc_pmu_init_data(struct platform_device *pdev,
 		return PTR_ERR(ddrc_pmu->base);
 	}
 
+	ddrc_pmu->identifier = readl(ddrc_pmu->base + DDRC_VERSION);
+
 	return 0;
 }
 
@@ -308,10 +311,23 @@ static const struct attribute_group hisi_ddrc_pmu_cpumask_attr_group = {
 	.attrs = hisi_ddrc_pmu_cpumask_attrs,
 };
 
+static struct device_attribute hisi_ddrc_pmu_identifier_attr =
+	__ATTR(identifier, 0444, hisi_uncore_pmu_identifier_attr_show, NULL);
+
+static struct attribute *hisi_ddrc_pmu_identifier_attrs[] = {
+	&hisi_ddrc_pmu_identifier_attr.attr,
+	NULL
+};
+
+static struct attribute_group hisi_ddrc_pmu_identifier_group = {
+	.attrs = hisi_ddrc_pmu_identifier_attrs,
+};
+
 static const struct attribute_group *hisi_ddrc_pmu_attr_groups[] = {
 	&hisi_ddrc_pmu_format_group,
 	&hisi_ddrc_pmu_events_group,
 	&hisi_ddrc_pmu_cpumask_attr_group,
+	&hisi_ddrc_pmu_identifier_group,
 	NULL,
 };
 

drivers/perf/hisilicon/hisi_uncore_hha_pmu.c

@@ -23,6 +23,7 @@
 #define HHA_INT_MASK		0x0804
 #define HHA_INT_STATUS		0x0808
 #define HHA_INT_CLEAR		0x080C
+#define HHA_VERSION		0x1cf0
 #define HHA_PERF_CTRL		0x1E00
 #define HHA_EVENT_CTRL		0x1E04
 #define HHA_EVENT_TYPE0		0x1E80
@@ -261,6 +262,8 @@ static int hisi_hha_pmu_init_data(struct platform_device *pdev,
 		return PTR_ERR(hha_pmu->base);
 	}
 
+	hha_pmu->identifier = readl(hha_pmu->base + HHA_VERSION);
+
 	return 0;
 }
 
@@ -320,10 +323,23 @@ static const struct attribute_group hisi_hha_pmu_cpumask_attr_group = {
 	.attrs = hisi_hha_pmu_cpumask_attrs,
 };
 
+static struct device_attribute hisi_hha_pmu_identifier_attr =
+	__ATTR(identifier, 0444, hisi_uncore_pmu_identifier_attr_show, NULL);
+
+static struct attribute *hisi_hha_pmu_identifier_attrs[] = {
+	&hisi_hha_pmu_identifier_attr.attr,
+	NULL
+};
+
+static struct attribute_group hisi_hha_pmu_identifier_group = {
+	.attrs = hisi_hha_pmu_identifier_attrs,
+};
+
 static const struct attribute_group *hisi_hha_pmu_attr_groups[] = {
 	&hisi_hha_pmu_format_group,
 	&hisi_hha_pmu_events_group,
 	&hisi_hha_pmu_cpumask_attr_group,
+	&hisi_hha_pmu_identifier_group,
 	NULL,
 };
 

drivers/perf/hisilicon/hisi_uncore_l3c_pmu.c

@@ -25,6 +25,7 @@
 #define L3C_INT_STATUS		0x0808
 #define L3C_INT_CLEAR		0x080c
 #define L3C_EVENT_CTRL	        0x1c00
+#define L3C_VERSION		0x1cf0
 #define L3C_EVENT_TYPE0		0x1d00
 /*
  * Each counter is 48-bits and [48:63] are reserved
@@ -264,6 +265,8 @@ static int hisi_l3c_pmu_init_data(struct platform_device *pdev,
 		return PTR_ERR(l3c_pmu->base);
 	}
 
+	l3c_pmu->identifier = readl(l3c_pmu->base + L3C_VERSION);
+
 	return 0;
 }
 
@@ -310,10 +313,23 @@ static const struct attribute_group hisi_l3c_pmu_cpumask_attr_group = {
 	.attrs = hisi_l3c_pmu_cpumask_attrs,
 };
 
+static struct device_attribute hisi_l3c_pmu_identifier_attr =
+	__ATTR(identifier, 0444, hisi_uncore_pmu_identifier_attr_show, NULL);
+
+static struct attribute *hisi_l3c_pmu_identifier_attrs[] = {
+	&hisi_l3c_pmu_identifier_attr.attr,
+	NULL
+};
+
+static struct attribute_group hisi_l3c_pmu_identifier_group = {
+	.attrs = hisi_l3c_pmu_identifier_attrs,
+};
+
 static const struct attribute_group *hisi_l3c_pmu_attr_groups[] = {
 	&hisi_l3c_pmu_format_group,
 	&hisi_l3c_pmu_events_group,
 	&hisi_l3c_pmu_cpumask_attr_group,
+	&hisi_l3c_pmu_identifier_group,
 	NULL,
 };
 

drivers/perf/hisilicon/hisi_uncore_pmu.c

@@ -119,6 +119,16 @@ int hisi_uncore_pmu_get_event_idx(struct perf_event *event)
 }
 EXPORT_SYMBOL_GPL(hisi_uncore_pmu_get_event_idx);
 
+ssize_t hisi_uncore_pmu_identifier_attr_show(struct device *dev,
+					     struct device_attribute *attr,
+					     char *page)
+{
+	struct hisi_pmu *hisi_pmu = to_hisi_pmu(dev_get_drvdata(dev));
+
+	return snprintf(page, PAGE_SIZE, "0x%08x\n", hisi_pmu->identifier);
+}
+EXPORT_SYMBOL_GPL(hisi_uncore_pmu_identifier_attr_show);
+
 static void hisi_uncore_pmu_clear_event_idx(struct hisi_pmu *hisi_pmu, int idx)
 {
 	if (!hisi_uncore_pmu_counter_valid(hisi_pmu, idx)) {

drivers/perf/hisilicon/hisi_uncore_pmu.h

@@ -75,6 +75,7 @@ struct hisi_pmu {
 	int counter_bits;
 	/* check event code range */
 	int check_event;
+	u32 identifier;
 };
 
 int hisi_uncore_pmu_counter_valid(struct hisi_pmu *hisi_pmu, int idx);
@@ -97,4 +98,10 @@ ssize_t hisi_cpumask_sysfs_show(struct device *dev,
 				struct device_attribute *attr, char *buf);
 int hisi_uncore_pmu_online_cpu(unsigned int cpu, struct hlist_node *node);
 int hisi_uncore_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node);
+
+ssize_t hisi_uncore_pmu_identifier_attr_show(struct device *dev,
+					     struct device_attribute *attr,
+					     char *page);
+
+
 #endif /* __HISI_UNCORE_PMU_H__ */