linux-kernel - [RFC v2 3/3] dma-buf: add show

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Message-Id: <20190322025135.118201-4-fengc@google.com>
Date:   Thu, 21 Mar 2019 19:51:35 -0700
From:   Chenbo Feng <fengc@...gle.com>
To:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-media@...r.kernel.org
Cc:     kernel-team@...roid.com, Sumit Semwal <sumit.semwal@...aro.org>,
        erickreyes@...gle.com, Daniel Vetter <daniel@...ll.ch>,
        Greg Hackmann <ghackmann@...gle.com>,
        Chenbo Feng <fengc@...gle.com>
Subject: [RFC v2 3/3] dma-buf: add show_fdinfo handler

From: Greg Hackmann <ghackmann@...gle.com>

The show_fdinfo handler exports the same information available through
debugfs on a per-buffer basis.

Signed-off-by: Greg Hackmann <ghackmann@...gle.com>
Signed-off-by: Chenbo Feng <fengc@...gle.com>
---
 drivers/dma-buf/dma-buf.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index f5e8d4fab950..fc7be2939ba1 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -383,6 +383,20 @@ static long dma_buf_ioctl(struct file *file,
 	}
 }
 
+static void dma_buf_show_fdinfo(struct seq_file *m, struct file *file)
+{
+	struct dma_buf *dmabuf = file->private_data;
+
+	seq_printf(m, "size:\t%zu\n", dmabuf->size);
+	/* Don't count the temporary reference taken inside procfs seq_show */
+	seq_printf(m, "count:\t%ld\n", file_count(dmabuf->file) - 1);
+	seq_printf(m, "exp_name:\t%s\n", dmabuf->exp_name);
+	mutex_lock(&dmabuf->lock);
+	if (dmabuf->name)
+		seq_printf(m, "name:\t%s\n", dmabuf->name);
+	mutex_unlock(&dmabuf->lock);
+}
+
 static const struct file_operations dma_buf_fops = {
 	.release	= dma_buf_release,
 	.mmap		= dma_buf_mmap_internal,
@@ -392,6 +406,7 @@ static const struct file_operations dma_buf_fops = {
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= dma_buf_ioctl,
 #endif
+	.show_fdinfo	= dma_buf_show_fdinfo,
 };
 
 /*
-- 
2.21.0.225.g810b269d1ac-goog