[PATCH V4 07/23] drm/etnaviv: add performance monitor request validation

[Christian Gmeiner]

Check if the selected domain and signal combination exists.

Signed-off-by: Christian Gmeiner <christian.gmeiner at gmail.com>
Reviewed-by: Lucas Stach <l.stach at pengutronix.de>
---
 drivers/gpu/drm/etnaviv/etnaviv_perfmon.c | 15 +++++++++++++++
 drivers/gpu/drm/etnaviv/etnaviv_perfmon.h |  2 ++
 2 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c b/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c
index 5bc015194791..3ecedeed87bd 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c
@@ -83,3 +83,18 @@ int etnaviv_pm_query_sig(struct etnaviv_gpu *gpu,
 
 	return 0;
 }
+
+int etnaviv_pm_req_validate(const struct drm_etnaviv_gem_submit_pmr *r)
+{
+	const struct etnaviv_pm_domain *dom;
+
+	if (r->domain >= ARRAY_SIZE(doms))
+		return -EINVAL;
+
+	dom = &doms[r->domain];
+
+	if (r->signal > dom->nr_signals)
+		return -EINVAL;
+
+	return 0;
+}
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_perfmon.h b/drivers/gpu/drm/etnaviv/etnaviv_perfmon.h
index 4b2b518cfd16..f20b69c942fc 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_perfmon.h
+++ b/drivers/gpu/drm/etnaviv/etnaviv_perfmon.h
@@ -40,4 +40,6 @@ int etnaviv_pm_query_dom(struct etnaviv_gpu *gpu,
 int etnaviv_pm_query_sig(struct etnaviv_gpu *gpu,
 	struct drm_etnaviv_pm_signal *signal);
 
+int etnaviv_pm_req_validate(const struct drm_etnaviv_gem_submit_pmr *r);
+
 #endif /* __ETNAVIV_PERFMON_H__ */
-- 
2.13.5