Messages in this thread Patch in this message | | | Date | Thu, 9 May 2019 17:00:32 -0700 | Subject | [dma-buf v3 3/3] dma-buf: add show_fdinfo handler | From | Chenbo Feng <> |
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From: Greg Hackmann <ghackmann@google.com>
The show_fdinfo handler exports the same information available through debugfs on a per-buffer basis.
Signed-off-by: Greg Hackmann <ghackmann@google.com> Signed-off-by: Chenbo Feng <fengc@google.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 c1da5f9ce44d..c4efc272fc34 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -381,6 +381,20 @@ 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, @@ -390,6 +404,7 @@ static const struct file_operations dma_buf_fops = { #ifdef CONFIG_COMPAT .compat_ioctl = dma_buf_ioctl, #endif + .show_fdinfo = dma_buf_show_fdinfo, }; /* -- 2.21.0.1020.gf2820cf01a-goog
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