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From: Tomasz Fujak on 28 Jan 2010 04:40
Signed-off-by: Tomasz Fujak <t.fujak(a)samsung.com>
Reviewed-by: Marek Szyprowski <m.szyprowski(a)samsung.com>
Reviewed-by: Pawel Osciak <p.osciak(a)samsung.com>
Reviewed-by: Kyungmin Park <kyungmin.park(a)samsung.com>

---
include/linux/perf_event.h | 19 +++++++++
kernel/perf_event.c | 92 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 111 insertions(+), 0 deletions(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index c66b34f..b50e2b8 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -458,6 +458,12 @@ enum perf_callchain_context {

#define PERF_MAX_STACK_DEPTH 255

+#define PERF_EVENT_RAW_BIT (1ULL << 63)
+#define PERF_EVENT_RAW_TO_CONFIG(_val) ((_val) | PERF_EVENT_RAW_BIT)
+#define PERF_EVENT_CONFIG_TO_RAW(_val) ((_val) & ~PERF_EVENT_RAW_BIT)
+#define PERF_EVENT_IS_RAW(_val) ((_val) & PERF_EVENT_RAW_BIT)
+
+
struct perf_callchain_entry {
__u64 nr;
__u64 ip[PERF_MAX_STACK_DEPTH];
@@ -554,6 +560,19 @@ struct perf_mmap_data {
void *data_pages[0];
};

+struct perf_event_description {
+ struct list_head list;
+
+ /* type : 1, subsystem [0..7], id [56..63]*/
+ __u64 config;
+ __u64 min_value; /* min. wakeup period */
+ __u64 max_value; /* max. wakeup period */
+ __u32 flags; /* ??? */
+ __u32 reserved[3];
+ char *name;
+ char *description;
+};
+
struct perf_pending_entry {
struct perf_pending_entry *next;
void (*func)(struct perf_pending_entry *);
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 603c0d8..dc68f0b 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -31,6 +31,9 @@
#include <linux/ftrace_event.h>
#include <linux/hw_breakpoint.h>

+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
#include <asm/irq_regs.h>

/*
@@ -99,6 +102,10 @@ void __weak hw_perf_enable(void) { barrier(); }
void __weak hw_perf_event_setup(int cpu) { barrier(); }
void __weak hw_perf_event_setup_online(int cpu) { barrier(); }

+static LIST_HEAD(perf_event_empty);
+
+const struct list_head __weak *perf_events_platform;
+
int __weak
hw_perf_group_sched_in(struct perf_event *group_leader,
struct perf_cpu_context *cpuctx,
@@ -5333,6 +5340,83 @@ perf_set_overcommit(struct sysdev_class *class, const char *buf, size_t count)
return count;
}

+static void *platevent_seq_start(struct seq_file *s, loff_t *pos)
+{
+ struct list_head *spos = NULL;
+
+ if (perf_events_platform) {
+ loff_t count = *pos;
+ struct list_head *curr;
+
+ list_for_each(curr, perf_events_platform)
+ if (!count--)
+ break;
+
+ if (curr != perf_events_platform) {
+ s->private = perf_events_platform;
+ spos = curr;
+ }
+ }
+
+ return spos;
+}
+
+static void *platevent_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ struct list_head *curr = (struct list_head *)v;
+ struct list_head *head = (struct list_head *)s->private;
+
+ if (list_is_last(curr, head))
+ return NULL;
+
+ ++(*pos);
+ return curr->next;
+}
+
+static void platevent_seq_stop(struct seq_file *s, void *v)
+{
+ kfree(v);
+}
+
+static int platevent_seq_show(struct seq_file *s, void *v)
+{
+ struct list_head *curr = (struct list_head *)v;
+
+ if (curr) {
+ struct perf_event_description *entry = list_entry(curr,
+ struct perf_event_description, list);
+
+ if (PERF_EVENT_IS_RAW(entry->config))
+ seq_printf(s, "0x%llx\t%s\t%lld-%lld\t%s\n",
+ PERF_EVENT_CONFIG_TO_RAW(entry->config),
+ entry->name, entry->min_value,
+ entry->max_value, entry->description);
+ }
+
+ return 0;
+}
+
+static const struct seq_operations platevent_seq_ops = {
+ .start = platevent_seq_start,
+ .next = platevent_seq_next,
+ .stop = platevent_seq_stop,
+ .show = platevent_seq_show
+};
+
+static int platevent_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &platevent_seq_ops);
+};
+
+static const struct file_operations platevent_file_ops = {
+ .owner = THIS_MODULE,
+ .open = platevent_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release
+};
+
+
static SYSDEV_CLASS_ATTR(
reserve_percpu,
0644,
@@ -5358,8 +5442,16 @@ static struct attribute_group perfclass_attr_group = {
.name = "perf_events",
};

+
static int __init perf_event_sysfs_init(void)
{
+ struct dentry *dentry;
+
+ dentry = debugfs_create_file("perf_events_platform", 0444, NULL,
+ NULL, &platevent_file_ops);
+ if (!dentry)
+ printk(KERN_WARNING "Cannot create debugfs entry 'perf_events_platform'\n");
+
return sysfs_create_group(&cpu_sysdev_class.kset.kobj,
&perfclass_attr_group);
}
--
1.5.4.3

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Prev: [PATCH/RFC v2 2/3] [ARM] perfevents: Event description for ARMv6, Cortex-A8 and Cortex-A9 exported
Next: [PATCH/RFC v2 0/3] Human readable platform-specific performance event support