dma-buf: Add debugfs support

Add debugfs support to make it easier to print debug information
about the dma-buf buffers.

Cc: Dave Airlie <airlied@redhat.com>
 [minor fixes on init and warning fix]
Cc: Dan Carpenter <dan.carpenter@oracle.com>
 [remove double unlock in fail case]
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>

1 files changed, 158 insertions, 0 deletions

diff --git a/drivers/base/dma-buf.c b/drivers/base/dma-buf.c
index d89102a29f65..08fe897c0b4c 100644
--- a/drivers/base/dma-buf.c
+++ b/drivers/base/dma-buf.c
@@ -27,9 +27,18 @@
 #include <linux/dma-buf.h>
 #include <linux/anon_inodes.h>
 #include <linux/export.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
 
 static inline int is_dma_buf_file(struct file *);
 
+struct dma_buf_list {
+        struct list_head head;
+        struct mutex lock;
+};
+
+static struct dma_buf_list db_list;
+
 static int dma_buf_release(struct inode *inode, struct file *file)
 {
         struct dma_buf *dmabuf;
@@ -42,6 +51,11 @@ static int dma_buf_release(struct inode *inode, struct file *file)
         BUG_ON(dmabuf->vmapping_counter);
 
         dmabuf->ops->release(dmabuf);
+
+        mutex_lock(&db_list.lock);
+        list_del(&dmabuf->list_node);
+        mutex_unlock(&db_list.lock);
+
         kfree(dmabuf);
         return 0;
 }
@@ -125,6 +139,10 @@ struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops,
         mutex_init(&dmabuf->lock);
         INIT_LIST_HEAD(&dmabuf->attachments);
 
+        mutex_lock(&db_list.lock);
+        list_add(&dmabuf->list_node, &db_list.head);
+        mutex_unlock(&db_list.lock);
+
         return dmabuf;
 }
 EXPORT_SYMBOL_GPL(dma_buf_export_named);
@@ -551,3 +569,143 @@ void dma_buf_vunmap(struct dma_buf *dmabuf, void *vaddr)
         mutex_unlock(&dmabuf->lock);
 }
 EXPORT_SYMBOL_GPL(dma_buf_vunmap);
+
+#ifdef CONFIG_DEBUG_FS
+static int dma_buf_describe(struct seq_file *s)
+{
+        int ret;
+        struct dma_buf *buf_obj;
+        struct dma_buf_attachment *attach_obj;
+        int count = 0, attach_count;
+        size_t size = 0;
+
+        ret = mutex_lock_interruptible(&db_list.lock);
+
+        if (ret)
+                return ret;
+
+        seq_printf(s, "\nDma-buf Objects:\n");
+        seq_printf(s, "\texp_name\tsize\tflags\tmode\tcount\n");
+
+        list_for_each_entry(buf_obj, &db_list.head, list_node) {
+                ret = mutex_lock_interruptible(&buf_obj->lock);
+
+                if (ret) {
+                        seq_printf(s,
+                                  "\tERROR locking buffer object: skipping\n");
+                        continue;
+                }
+
+                seq_printf(s, "\t");
+
+                seq_printf(s, "\t%s\t%08zu\t%08x\t%08x\t%08ld\n",
+                                buf_obj->exp_name, buf_obj->size,
+                                buf_obj->file->f_flags, buf_obj->file->f_mode,
+                                (long)(buf_obj->file->f_count.counter));
+
+                seq_printf(s, "\t\tAttached Devices:\n");
+                attach_count = 0;
+
+                list_for_each_entry(attach_obj, &buf_obj->attachments, node) {
+                        seq_printf(s, "\t\t");
+
+                        seq_printf(s, "%s\n", attach_obj->dev->init_name);
+                        attach_count++;
+                }
+
+                seq_printf(s, "\n\t\tTotal %d devices attached\n",
+                                attach_count);
+
+                count++;
+                size += buf_obj->size;
+                mutex_unlock(&buf_obj->lock);
+        }
+
+        seq_printf(s, "\nTotal %d objects, %zu bytes\n", count, size);
+
+        mutex_unlock(&db_list.lock);
+        return 0;
+}
+
+static int dma_buf_show(struct seq_file *s, void *unused)
+{
+        void (*func)(struct seq_file *) = s->private;
+        func(s);
+        return 0;
+}
+
+static int dma_buf_debug_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, dma_buf_show, inode->i_private);
+}
+
+static const struct file_operations dma_buf_debug_fops = {
+        .open           = dma_buf_debug_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static struct dentry *dma_buf_debugfs_dir;
+
+static int dma_buf_init_debugfs(void)
+{
+        int err = 0;
+        dma_buf_debugfs_dir = debugfs_create_dir("dma_buf", NULL);
+        if (IS_ERR(dma_buf_debugfs_dir)) {
+                err = PTR_ERR(dma_buf_debugfs_dir);
+                dma_buf_debugfs_dir = NULL;
+                return err;
+        }
+
+        err = dma_buf_debugfs_create_file("bufinfo", dma_buf_describe);
+
+        if (err)
+                pr_debug("dma_buf: debugfs: failed to create node bufinfo\n");
+
+        return err;
+}
+
+static void dma_buf_uninit_debugfs(void)
+{
+        if (dma_buf_debugfs_dir)
+                debugfs_remove_recursive(dma_buf_debugfs_dir);
+}
+
+int dma_buf_debugfs_create_file(const char *name,
+                                int (*write)(struct seq_file *))
+{
+        struct dentry *d;
+
+        d = debugfs_create_file(name, S_IRUGO, dma_buf_debugfs_dir,
+                        write, &dma_buf_debug_fops);
+
+        if (IS_ERR(d))
+                return PTR_ERR(d);
+
+        return 0;
+}
+#else
+static inline int dma_buf_init_debugfs(void)
+{
+        return 0;
+}
+static inline void dma_buf_uninit_debugfs(void)
+{
+}
+#endif
+
+static int __init dma_buf_init(void)
+{
+        mutex_init(&db_list.lock);
+        INIT_LIST_HEAD(&db_list.head);
+        dma_buf_init_debugfs();
+        return 0;
+}
+subsys_initcall(dma_buf_init);
+
+static void __exit dma_buf_deinit(void)
+{
+        dma_buf_uninit_debugfs();
+}
+__exitcall(dma_buf_deinit);