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Date: Tue, 26 Feb 2019 19:54:48 -0800 From: Chenbo Feng <fengc@...gle.com> To: linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org Cc: Sumit Semwal <sumit.semwal@...aro.org>, erickreyes@...gle.com, Greg Hackmann <ghackmann@...gle.com>, Chenbo Feng <fengc@...gle.com> Subject: [RFC dma-buf 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 e0d9cdd3520b..2da3e2653f92 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -377,6 +377,20 @@ 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, @@ -386,6 +400,7 @@ 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.rc2.261.ga7da99ff1b-goog
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