Useful for local debugging
Signed-off-by: Sagi Grimberg <[email protected]>
---
include/linux/irq-am.h | 2 +
lib/irq-am.c | 109 +++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 111 insertions(+)
diff --git a/include/linux/irq-am.h b/include/linux/irq-am.h
index 5ddd5ca268aa..18df315633a4 100644
--- a/include/linux/irq-am.h
+++ b/include/linux/irq-am.h
@@ -101,6 +101,8 @@ struct irq_am {
struct work_struct work;
irq_am_fn *program;
+ struct dentry *debugfs_dir;
+ int id;
};
void irq_am_add_event(struct irq_am *am);
diff --git a/lib/irq-am.c b/lib/irq-am.c
index ed7befd7a560..6cd2f131f5e8 100644
--- a/lib/irq-am.c
+++ b/lib/irq-am.c
@@ -12,6 +12,61 @@
* more details.
*/
#include <linux/irq-am.h>
+#include <linux/debugfs.h>
+
+static DEFINE_IDA(am_ida);
+
+#ifdef CONFIG_DEBUG_FS
+struct dentry *irq_am_debugfs_root;
+
+struct irq_am_debugfs_attr {
+ const char *name;
+ umode_t mode;
+ int (*show)(void *, struct seq_file *);
+ ssize_t (*write)(void *, const char __user *, size_t, loff_t *);
+};
+
+static int irq_am_tune_state_show(void *data, struct seq_file *m)
+{
+ struct irq_am *am = data;
+
+ seq_printf(m, "%d\n", am->tune_state);
+ return 0;
+}
+
+static int irq_am_curr_level_show(void *data, struct seq_file *m)
+{
+ struct irq_am *am = data;
+
+ seq_printf(m, "%d\n", am->curr_level);
+ return 0;
+}
+
+static int irq_am_debugfs_show(struct seq_file *m, void *v)
+{
+ const struct irq_am_debugfs_attr *attr = m->private;
+ void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private;
+
+ return attr->show(data, m);
+}
+
+static int irq_am_debugfs_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, irq_am_debugfs_show, inode->i_private);
+}
+
+static const struct file_operations irq_am_debugfs_fops = {
+ .open = irq_am_debugfs_open,
+ .read = seq_read,
+ .release = seq_release,
+};
+
+static const struct irq_am_debugfs_attr irq_am_attrs[] = {
+ {"tune_state", 0400, irq_am_tune_state_show},
+ {"curr_level", 0400, irq_am_curr_level_show},
+ {},
+};
+#endif
static void irq_am_try_step(struct irq_am *am)
{
@@ -160,10 +215,51 @@ static void irq_am_program_moderation_work(struct
work_struct *w)
am->state = IRQ_AM_START_MEASURING;
}
+#ifdef CONFIG_DEBUG_FS
+static bool debugfs_create_files(struct dentry *parent, void *data,
+ const struct irq_am_debugfs_attr *attr)
+{
+ d_inode(parent)->i_private = data;
+
+ for (; attr->name; attr++) {
+ if (!debugfs_create_file(attr->name, attr->mode, parent,
+ (void *)attr, &irq_am_debugfs_fops))
+ return false;
+ }
+ return true;
+}
+
+static int irq_am_register_debugfs(struct irq_am *am)
+{
+ char name[20];
+
+ snprintf(name, sizeof(name), "am%u", am->id);
+ am->debugfs_dir = debugfs_create_dir(name,
+ irq_am_debugfs_root);
+ if (!am->debugfs_dir)
+ return -ENOMEM;
+
+ if (!debugfs_create_files(am->debugfs_dir, am,
+ irq_am_attrs))
+ return -ENOMEM;
+ return 0;
+}
+
+static void irq_am_deregister_debugfs(struct irq_am *am)
+{
+ debugfs_remove_recursive(am->debugfs_dir);
+}
+
+#else
+static int irq_am_register_debugfs(struct irq_am *am) {}
+static void irq_am_deregister_debugfs(struct irq_am *am) {}
+#endif
void irq_am_cleanup(struct irq_am *am)
{
flush_work(&am->work);
+ irq_am_deregister_debugfs(am);
+ ida_simple_remove(&am_ida, am->id);
}
EXPORT_SYMBOL_GPL(irq_am_cleanup);
@@ -177,6 +273,19 @@ void irq_am_init(struct irq_am *am, unsigned int nr_events,
am->nr_events = nr_events;
am->curr_level = start_level;
am->program = fn;
+ am->id = ida_simple_get(&am_ida, 0, 0, GFP_KERNEL);
+ WARN_ON(am->id < 0);
INIT_WORK(&am->work, irq_am_program_moderation_work);
+ if (irq_am_register_debugfs(am))
+ pr_warn("irq-am %d failed to register debugfs\n", am->id);
}
EXPORT_SYMBOL_GPL(irq_am_init);
+
+static __init int irq_am_setup(void)
+{
+#ifdef CONFIG_DEBUG_FS
+ irq_am_debugfs_root = debugfs_create_dir("irq_am", NULL);
+#endif
+ return 0;
+}
+subsys_initcall(irq_am_setup);
--
2.14.1
