linux-kernel - [PATCH RFC 4/9] drm/amd/pm: Avoid open-coded use of ratelimit

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Message-Id: <20250403211514.985900-4-paulmck@kernel.org>
Date: Thu,  3 Apr 2025 14:15:09 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: kernel-team@...a.com,
	"Paul E. McKenney" <paulmck@...nel.org>,
	kernel test robot <lkp@...el.com>,
	Kenneth Feng <kenneth.feng@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	Xinhui Pan <Xinhui.Pan@....com>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH RFC 4/9] drm/amd/pm: Avoid open-coded use of ratelimit_state structure's internals

The amdgpu_set_thermal_throttling_logging() function directly accesses
the ratelimit_state structure's ->missed field, which work, but which
also makes it more difficult to change this field.  Therefore, make
use of the ratelimit_state_reset_miss() function instead of directly
accessing the ->missed field.

Nevertheless, open-coded use of ->burst and ->interval is still permitted,
for example, for runtime sysfs adjustment of these fields.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202503180826.EiekA1MB-lkp@intel.com/
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Cc: Kenneth Feng <kenneth.feng@....com>
Cc: Alex Deucher <alexander.deucher@....com>
Cc: "Christian König" <christian.koenig@....com>
Cc: Xinhui Pan <Xinhui.Pan@....com>
Cc: David Airlie <airlied@...il.com>
Cc: Simona Vetter <simona@...ll.ch>
Cc: <amd-gfx@...ts.freedesktop.org>
Cc: <dri-devel@...ts.freedesktop.org>
---
 drivers/gpu/drm/amd/pm/amdgpu_pm.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
index e8ae7681bf0a3..6adf4e8822108 100644
--- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
@@ -1663,7 +1663,6 @@ static ssize_t amdgpu_set_thermal_throttling_logging(struct device *dev,
 	struct drm_device *ddev = dev_get_drvdata(dev);
 	struct amdgpu_device *adev = drm_to_adev(ddev);
 	long throttling_logging_interval;
-	unsigned long flags;
 	int ret = 0;
 
 	ret = kstrtol(buf, 0, &throttling_logging_interval);
@@ -1674,18 +1673,12 @@ static ssize_t amdgpu_set_thermal_throttling_logging(struct device *dev,
 		return -EINVAL;
 
 	if (throttling_logging_interval > 0) {
-		raw_spin_lock_irqsave(&adev->throttling_logging_rs.lock, flags);
 		/*
 		 * Reset the ratelimit timer internals.
 		 * This can effectively restart the timer.
 		 */
-		adev->throttling_logging_rs.interval =
-			(throttling_logging_interval - 1) * HZ;
-		adev->throttling_logging_rs.begin = 0;
-		adev->throttling_logging_rs.printed = 0;
-		adev->throttling_logging_rs.missed = 0;
-		raw_spin_unlock_irqrestore(&adev->throttling_logging_rs.lock, flags);
-
+		ratelimit_state_reset_interval(&adev->throttling_logging_rs,
+					       (throttling_logging_interval - 1) * HZ);
 		atomic_set(&adev->throttling_logging_enabled, 1);
 	} else {
 		atomic_set(&adev->throttling_logging_enabled, 0);
-- 
2.40.1