From: Michal Wajdeczko <michal.wajdeczko@intel.com>
Date: Tue, 27 Jan 2026 19:37:22 +0000 (+0100)
Subject: drm/xe: Move exponential sleep logic to helper
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=eec43f368466e0de9a4aaa4d09ac23815186d2a6;p=thirdparty%2Fkernel%2Flinux.git

drm/xe: Move exponential sleep logic to helper

We want to reuse the same increased sleep logic in other places.
To avoid code duplication, move it to the helper.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20260127193727.601-3-michal.wajdeczko@intel.com
---

diff --git a/drivers/gpu/drm/xe/xe_guc_submit.c b/drivers/gpu/drm/xe/xe_guc_submit.c
index bab930ca62e3f..de716c1fb18e0 100644
--- a/drivers/gpu/drm/xe/xe_guc_submit.c
+++ b/drivers/gpu/drm/xe/xe_guc_submit.c
@@ -1049,10 +1049,7 @@ try_again:
 				return -ENODEV;
 			}
 
-			msleep(sleep_period_ms);
-			sleep_total_ms += sleep_period_ms;
-			if (sleep_period_ms < 64)
-				sleep_period_ms <<= 1;
+			sleep_total_ms += xe_sleep_exponential_ms(&sleep_period_ms, 64);
 			goto try_again;
 		}
 	}
diff --git a/drivers/gpu/drm/xe/xe_sleep.h b/drivers/gpu/drm/xe/xe_sleep.h
index a772f1a37395f..2bc3f4c0ee0b3 100644
--- a/drivers/gpu/drm/xe/xe_sleep.h
+++ b/drivers/gpu/drm/xe/xe_sleep.h
@@ -33,4 +33,25 @@ static inline void xe_sleep_relaxed_ms(unsigned int delay_ms)
 	usleep_range(min_us, max_us);
 }
 
+/**
+ * xe_sleep_exponential_ms() - Sleep for a exponentially increased time.
+ * @sleep_period_ms: current time in msec to sleep
+ * @max_sleep_ms: maximum time in msec to sleep
+ *
+ * Sleep for the @sleep_period_ms and exponentially increase this time for the
+ * next loop, unless reaching the @max_sleep_ms limit.
+ *
+ * Return: approximate time in msec the task was delayed.
+ */
+static inline unsigned int xe_sleep_exponential_ms(unsigned int *sleep_period_ms,
+						   unsigned int max_sleep_ms)
+{
+	unsigned int delay_ms = *sleep_period_ms;
+	unsigned int next_delay_ms = 2 * delay_ms;
+
+	xe_sleep_relaxed_ms(delay_ms);
+	*sleep_period_ms = min(next_delay_ms, max_sleep_ms);
+	return delay_ms;
+}
+
 #endif