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UPSTREAM: dma-buf: add show_fdinfo handler

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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>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190613223408.139221-4-fengc@google.com
(cherry picked from commit bcc071110aeacd28a87525a2442dd96eab145a3c)

Bug: 135613055
Test: run dmabufinfo_test.cpp and check the info is showed up in
      /proc/pid/fdinfo

Change-Id: I7e82209af812e2a3160ec470113c2ced991c9fc3
This commit is contained in:
Greg Hackmann 2019-06-13 15:34:08 -07:00 committed by Alistair Delva
parent 4cc456b318
commit e204fa49a0
1 changed files with 15 additions and 0 deletions
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15
drivers/dma-buf/dma-buf.c
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@ -397,6 +397,20 @@ 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,
@ -406,6 +420,7 @@ static const struct file_operations dma_buf_fops = {
#ifdef CONFIG_COMPAT
.compat_ioctl = dma_buf_ioctl,
#endif
.show_fdinfo = dma_buf_show_fdinfo,
};
/*