[RFC][PATCH v1 06/15] perf: export tracepoint events via sysfs: iwlwifi and iwlwifi_io

[Lin Ming <ming.m.lin@intel.com>]

iwlwifi and iwlwifi_io tracepoint events are exported like below,

/sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/net/wlan0/events/
|-- iwlwifi_dev_hcmd
|   |-- config
|   |-- type
|-- iwlwifi_dev_rx
|   |-- config
|   |-- type
....
....
|-- iwlwifi_dev_ioread32
|   |-- config
|   |-- type
|-- iwlwifi_dev_iowrite32
|   |-- config
|   |-- type
|-- iwlwifi_dev_iowrite8
|   |-- config
|   |-- type
---
 drivers/net/wireless/iwlwifi/iwl3945-base.c |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/drivers/net/wireless/iwlwifi/iwl3945-base.c b/drivers/net/wireless/iwlwifi/iwl3945-base.c
index a27872d..cbcc2bb 100644
--- a/drivers/net/wireless/iwlwifi/iwl3945-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl3945-base.c
@@ -41,6 +41,7 @@
 #include <linux/firmware.h>
 #include <linux/etherdevice.h>
 #include <linux/if_arp.h>
+#include <linux/perf_event.h>
 
 #include <net/ieee80211_radiotap.h>
 #include <net/mac80211.h>
@@ -3989,6 +3990,18 @@ static int iwl3945_setup_mac(struct iwl_priv *priv)
 	return 0;
 }
 
+static void iwl_sys_add_tp(struct kobject *kobj)
+{
+	struct kobject *events_kobj;
+
+	events_kobj = perf_sys_create_events_dir(kobj);
+	if (!events_kobj)
+		return;
+
+	perf_sys_add_tp_events(events_kobj, "iwlwifi");
+	perf_sys_add_tp_events(events_kobj, "iwlwifi_io");
+}
+
 static int iwl3945_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	int err = 0;
@@ -4148,6 +4161,8 @@ static int iwl3945_pci_probe(struct pci_dev *pdev, const struct pci_device_id *e
 		goto out_release_irq;
 	}
 
+	iwl_sys_add_tp(&pdev->dev.kobj);
+
 	iwl_set_rxon_channel(priv,
 			     &priv->bands[IEEE80211_BAND_2GHZ].channels[5]);
 	iwl3945_setup_deferred_work(priv);