Initial import

1 files changed, 201 insertions, 0 deletions

diff --git a/drivers/oprofile/oprofile_files.c b/drivers/oprofile/oprofile_files.c
new file mode 100644
index 000000000..ee2cfce35
--- /dev/null
+++ b/drivers/oprofile/oprofile_files.c
@@ -0,0 +1,201 @@
+/**
+ * @file oprofile_files.c
+ *
+ * @remark Copyright 2002 OProfile authors
+ * @remark Read the file COPYING
+ *
+ * @author John Levon <levon@movementarian.org>
+ */
+
+#include <linux/fs.h>
+#include <linux/oprofile.h>
+#include <linux/jiffies.h>
+
+#include "event_buffer.h"
+#include "oprofile_stats.h"
+#include "oprof.h"
+
+#define BUFFER_SIZE_DEFAULT		131072
+#define CPU_BUFFER_SIZE_DEFAULT		8192
+#define BUFFER_WATERSHED_DEFAULT	32768	/* FIXME: tune */
+#define TIME_SLICE_DEFAULT		1
+
+unsigned long oprofile_buffer_size;
+unsigned long oprofile_cpu_buffer_size;
+unsigned long oprofile_buffer_watershed;
+unsigned long oprofile_time_slice;
+
+#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
+
+static ssize_t timeout_read(struct file *file, char __user *buf,
+		size_t count, loff_t *offset)
+{
+	return oprofilefs_ulong_to_user(jiffies_to_msecs(oprofile_time_slice),
+					buf, count, offset);
+}
+
+
+static ssize_t timeout_write(struct file *file, char const __user *buf,
+		size_t count, loff_t *offset)
+{
+	unsigned long val;
+	int retval;
+
+	if (*offset)
+		return -EINVAL;
+
+	retval = oprofilefs_ulong_from_user(&val, buf, count);
+	if (retval <= 0)
+		return retval;
+
+	retval = oprofile_set_timeout(val);
+
+	if (retval)
+		return retval;
+	return count;
+}
+
+
+static const struct file_operations timeout_fops = {
+	.read		= timeout_read,
+	.write		= timeout_write,
+	.llseek		= default_llseek,
+};
+
+#endif
+
+
+static ssize_t depth_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
+{
+	return oprofilefs_ulong_to_user(oprofile_backtrace_depth, buf, count,
+					offset);
+}
+
+
+static ssize_t depth_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
+{
+	unsigned long val;
+	int retval;
+
+	if (*offset)
+		return -EINVAL;
+
+	if (!oprofile_ops.backtrace)
+		return -EINVAL;
+
+	retval = oprofilefs_ulong_from_user(&val, buf, count);
+	if (retval <= 0)
+		return retval;
+
+	retval = oprofile_set_ulong(&oprofile_backtrace_depth, val);
+	if (retval)
+		return retval;
+
+	return count;
+}
+
+
+static const struct file_operations depth_fops = {
+	.read		= depth_read,
+	.write		= depth_write,
+	.llseek		= default_llseek,
+};
+
+
+static ssize_t pointer_size_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
+{
+	return oprofilefs_ulong_to_user(sizeof(void *), buf, count, offset);
+}
+
+
+static const struct file_operations pointer_size_fops = {
+	.read		= pointer_size_read,
+	.llseek		= default_llseek,
+};
+
+
+static ssize_t cpu_type_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
+{
+	return oprofilefs_str_to_user(oprofile_ops.cpu_type, buf, count, offset);
+}
+
+
+static const struct file_operations cpu_type_fops = {
+	.read		= cpu_type_read,
+	.llseek		= default_llseek,
+};
+
+
+static ssize_t enable_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
+{
+	return oprofilefs_ulong_to_user(oprofile_started, buf, count, offset);
+}
+
+
+static ssize_t enable_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
+{
+	unsigned long val;
+	int retval;
+
+	if (*offset)
+		return -EINVAL;
+
+	retval = oprofilefs_ulong_from_user(&val, buf, count);
+	if (retval <= 0)
+		return retval;
+
+	retval = 0;
+	if (val)
+		retval = oprofile_start();
+	else
+		oprofile_stop();
+
+	if (retval)
+		return retval;
+	return count;
+}
+
+
+static const struct file_operations enable_fops = {
+	.read		= enable_read,
+	.write		= enable_write,
+	.llseek		= default_llseek,
+};
+
+
+static ssize_t dump_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
+{
+	wake_up_buffer_waiter();
+	return count;
+}
+
+
+static const struct file_operations dump_fops = {
+	.write		= dump_write,
+	.llseek		= noop_llseek,
+};
+
+void oprofile_create_files(struct dentry *root)
+{
+	/* reinitialize default values */
+	oprofile_buffer_size =		BUFFER_SIZE_DEFAULT;
+	oprofile_cpu_buffer_size =	CPU_BUFFER_SIZE_DEFAULT;
+	oprofile_buffer_watershed =	BUFFER_WATERSHED_DEFAULT;
+	oprofile_time_slice =		msecs_to_jiffies(TIME_SLICE_DEFAULT);
+
+	oprofilefs_create_file(root, "enable", &enable_fops);
+	oprofilefs_create_file_perm(root, "dump", &dump_fops, 0666);
+	oprofilefs_create_file(root, "buffer", &event_buffer_fops);
+	oprofilefs_create_ulong(root, "buffer_size", &oprofile_buffer_size);
+	oprofilefs_create_ulong(root, "buffer_watershed", &oprofile_buffer_watershed);
+	oprofilefs_create_ulong(root, "cpu_buffer_size", &oprofile_cpu_buffer_size);
+	oprofilefs_create_file(root, "cpu_type", &cpu_type_fops);
+	oprofilefs_create_file(root, "backtrace_depth", &depth_fops);
+	oprofilefs_create_file(root, "pointer_size", &pointer_size_fops);
+#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
+	oprofilefs_create_file(root, "time_slice", &timeout_fops);
+#endif
+	oprofile_create_stats_files(root);
+	if (oprofile_ops.create_files)
+		oprofile_ops.create_files(root);
+}