linux-kernel - [PATCH v1 3/3] iwlwifi: mvm: Use for_each_thermal

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Date: Wed, 07 Feb 2024 20:12:38 +0100
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: Gregory Greenman <gregory.greenman@...el.com>,
 Miri Korenblit <miriam.rachel.korenblit@...el.com>,
 Kalle Valo <kvalo@...nel.org>, Johannes Berg <johannes.berg@...el.com>,
 linux-wireless@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Stanislaw Gruszka <stanislaw.gruszka@...ux.intel.com>
Subject:
 [PATCH v1 3/3] iwlwifi: mvm: Use for_each_thermal_trip() for walking trip
 points

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

The code walking trip points in iwl_mvm_send_temp_report_ths_cmd()
reads the trip table passed to thermal_zone_device_register_with_trips()
in order to get the current trip temperatures, but this is not
guaranteed to work in the future, because the thermal zone will store
trip points information internally.

For this reason, make iwl_mvm_send_temp_report_ths_cmd() use
for_each_thermal_trip() as appropriate for walking trip points in a
given thermal zone.

No intentional functional impact, but it is requisite for future thermal
core improvements.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/tt.c |   40 +++++++++++++++++-----------
 1 file changed, 25 insertions(+), 15 deletions(-)

Index: linux-pm/drivers/net/wireless/intel/iwlwifi/mvm/tt.c
===================================================================
--- linux-pm.orig/drivers/net/wireless/intel/iwlwifi/mvm/tt.c
+++ linux-pm/drivers/net/wireless/intel/iwlwifi/mvm/tt.c
@@ -555,6 +555,22 @@ static int compare_temps(const void *a,
 	return ((s16)le16_to_cpu(*(__le16 *)a) -
 		(s16)le16_to_cpu(*(__le16 *)b));
 }
+
+struct iwl_trip_walk_data {
+	__le16 *thresholds;
+	int count;
+};
+
+static int iwl_trip_temp_cb(struct thermal_trip *trip, void *arg)
+{
+	struct iwl_trip_walk_data *twd = arg;
+
+	if (trip->temperature == THERMAL_TEMP_INVALID)
+		return 0;
+
+	twd->thresholds[twd->count++] = cpu_to_le16((s16)(trip->temperature / 1000));
+	return 0;
+}
 #endif

 int iwl_mvm_send_temp_report_ths_cmd(struct iwl_mvm *mvm)
@@ -562,31 +578,25 @@ int iwl_mvm_send_temp_report_ths_cmd(str
 	struct temp_report_ths_cmd cmd = {0};
 	int ret;
 #ifdef CONFIG_THERMAL
-	int i, idx = 0;
+	struct iwl_trip_walk_data twd = { .thresholds = cmd.thresholds, .count = 0 };

 	lockdep_assert_held(&mvm->mutex);

 	if (!mvm->tz_device.tzone)
 		goto send;

-	/* The driver holds array of temperature trips that are unsorted
-	 * and uncompressed, the FW should get it compressed and sorted
+	/*
+	 * The thermal core holds an array of temperature trips that are
+	 * unsorted and uncompressed, the FW should get it compressed and
+	 * sorted.
 	 */

 	/* compress trips to cmd array, remove uninitialized values*/
-	for (i = 0; i < IWL_MAX_DTS_TRIPS; i++) {
-		if (mvm->tz_device.trips[i].temperature != THERMAL_TEMP_INVALID) {
-			cmd.thresholds[idx++] =
-				cpu_to_le16((s16)(mvm->tz_device.trips[i].temperature / 1000));
-		}
-	}
-	cmd.num_temps = cpu_to_le32(idx);
-
-	if (!idx)
-		goto send;
+	for_each_thermal_trip(mvm->tz_device.tzone, iwl_trip_temp_cb, &twd);

-	/*sort cmd array*/
-	sort(cmd.thresholds, idx, sizeof(s16), compare_temps, NULL);
+	cmd.num_temps = cpu_to_le32(twd.count);
+	if (twd.count)
+		sort(cmd.thresholds, twd.count, sizeof(s16), compare_temps, NULL);

 send:
 #endif