[PATCH v5 03/21] gpu: host1x: Show number of pending waiters in debugfs

Mikko Perttunen
2021-01-11T13:02:14Z

Show the number of pending waiters in the debugfs status file.
This is useful for testing to verify that waiters do not leak
or accumulate incorrectly.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
---
drivers/gpu/host1x/debug.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/host1x/debug.c b/drivers/gpu/host1x/debug.c
index 1b4997bda1c7..8a14880c61bb 100644
--- a/drivers/gpu/host1x/debug.c
+++ b/drivers/gpu/host1x/debug.c
@@ -69,6 +69,7 @@ static int show_channel(struct host1x_channel *ch, void *data, bool show_fifo)

static void show_syncpts(struct host1x *m, struct output *o)
{
+ struct list_head *pos;
unsigned int i;

host1x_debug_output(o, "---- syncpts ----\n");
@@ -76,12 +77,19 @@ static void show_syncpts(struct host1x *m, struct output *o)
for (i = 0; i < host1x_syncpt_nb_pts(m); i++) {
u32 max = host1x_syncpt_read_max(m->syncpt + i);
u32 min = host1x_syncpt_load(m->syncpt + i);
+ unsigned int waiters = 0;

- if (!min && !max)
+ spin_lock(&m->syncpt[i].intr.lock);
+ list_for_each(pos, &m->syncpt[i].intr.wait_head)
+ waiters++;
+ spin_unlock(&m->syncpt[i].intr.lock);
+
+ if (!min && !max && !waiters)
continue;

- host1x_debug_output(o, "id %u (%s) min %d max %d\n",
- i, m->syncpt[i].name, min, max);
+ host1x_debug_output(o,
+ "id %u (%s) min %d max %d (%d waiters)\n",
+ i, m->syncpt[i].name, min, max, waiters);
}

for (i = 0; i < host1x_syncpt_nb_bases(m); i++) {
--
2.30.0