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Commit bcc07111 authored by Greg Hackmann's avatar Greg Hackmann Committed by Sumit Semwal
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dma-buf: add show_fdinfo handler 



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

Signed-off-by: default avatarGreg Hackmann <ghackmann@google.com>
Signed-off-by: default avatarChenbo Feng <fengc@google.com>
Signed-off-by: default avatarSumit Semwal <sumit.semwal@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190613223408.139221-4-fengc@google.com
parent bb2bb903

drivers/dma-buf/dma-buf.c

+15 −0
Original line number Diff line number Diff line
@@ -401,6 +401,20 @@ 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,
@@ -410,6 +424,7 @@ static const struct file_operations dma_buf_fops = { 
#ifdef CONFIG_COMPAT

	.compat_ioctl	= dma_buf_ioctl,

#endif

	.show_fdinfo	= dma_buf_show_fdinfo,

};



/*