@@ -1606,6 +1606,9 @@ static int gen6_reset_engines(struct drm_i915_private *dev_priv,
* wish to wait without holding forcewake for the duration (i.e. you expect
* the wait to be slow).
*
+ * Only @fast_timeout_us < 10us are allowed in atomic context.
+ * Note that @fast_timeout_us >= 50000us are not allowed at all.
+ *
* Returns 0 if the register matches the desired condition, or -ETIMEOUT.
*/
int __intel_wait_for_register_fw(struct drm_i915_private *dev_priv,
@@ -1620,6 +1623,9 @@ int __intel_wait_for_register_fw(struct drm_i915_private *dev_priv,
#define done (((reg_value = I915_READ_FW(reg)) & mask) == value)
int ret;
+ /* Catch any overuse of this function */
+ might_sleep_if(fast_timeout_us > 10 || slow_timeout_ms);
+
if (fast_timeout_us > 10)
ret = _wait_for(done, fast_timeout_us, 10);
else
This function should not be called with long timeouts in atomic context. Annotate it as might_sleep if timeout is longer than 10us. Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com> Suggested-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Chris Wilson <chris@chris-wilson.co.uk> --- drivers/gpu/drm/i915/intel_uncore.c | 6 ++++++ 1 file changed, 6 insertions(+)