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Wysocki" To: Linux ACPI , Daniel Lezcano Cc: LKML , Linux PM , Michal Wilczynski , Zhang Rui , Srinivas Pandruvada Subject: [PATCH v5 09/11] ACPI: thermal: Rework thermal_get_trend() Date: Mon, 07 Aug 2023 20:17:07 +0200 Message-ID: <8296661.NyiUUSuA9g@kreacher> In-Reply-To: <4503814.LvFx2qVVIh@kreacher> References: <13318886.uLZWGnKmhe@kreacher> <4503814.LvFx2qVVIh@kreacher> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="UTF-8" X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: clean X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedviedrledtgdduudejucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomhepfdftrghfrggvlhculfdrucghhihsohgtkhhifdcuoehrjhifsehrjhifhihsohgtkhhirdhnvghtqedpnhgspghrtghpthhtohepjedprhgtphhtthhopehlihhnuhigqdgrtghpihesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhinhhugidqkhgvrhhnvghlsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhrtghpthhtoheplhhinhhugidqphhmsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhrtghp thhtohepmhhitghhrghlrdifihhltgiihihnshhkihesihhnthgvlhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=7 Fuz1=7 Fuz2=7 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rafael J. Wysocki Rework the ACPI thermal driver's .get_trend() callback function, thermal_get_trend(), so that it does not call thermal_get_trip_type() and thermal_get_trip_temp() which are going to be dropped. This reduces the overhead of the function too, because it will always carry out a trip point lookup once after the change. Signed-off-by: Rafael J. Wysocki --- v4 -> v5: * Rebase on top of patches [07-08/11]. v3 -> v4: * Adjust for the lack of a direct way to get from the local trip point representations to trips[i]. v2 -> v3: Rebase on top of the v2 of the previous patch. v1 -> v2: * Do not acquire thermal_check_lock in thermal_get_trend() (lockdep would complain about this, because it is hold around thermal zone locking and .get_trend() runs under the thermal zone lock). The thermal zone locking added in the previous patches is sufficient to protect this code. * Check trips against invalid temperature values. * Return an error for trips other than passive and active. --- drivers/acpi/thermal.c | 68 +++++++++++++++++++++++++++---------------------- 1 file changed, 38 insertions(+), 30 deletions(-) Index: linux-pm/drivers/acpi/thermal.c =================================================================== --- linux-pm.orig/drivers/acpi/thermal.c +++ linux-pm/drivers/acpi/thermal.c @@ -597,46 +597,54 @@ static int thermal_get_crit_temp(struct } static int thermal_get_trend(struct thermal_zone_device *thermal, - int trip, enum thermal_trend *trend) + int trip_index, enum thermal_trend *trend) { struct acpi_thermal *tz = thermal_zone_device_priv(thermal); - enum thermal_trip_type type; - int i; + struct acpi_thermal_trip *acpi_trip; + int t, i; - if (thermal_get_trip_type(thermal, trip, &type)) + if (!tz || trip_index < 0) return -EINVAL; - if (type == THERMAL_TRIP_ACTIVE) { - int trip_temp; - int temp = deci_kelvin_to_millicelsius_with_offset( - tz->temperature, tz->kelvin_offset); - if (thermal_get_trip_temp(thermal, trip, &trip_temp)) - return -EINVAL; + if (tz->trips.critical.valid) + trip_index--; - if (temp > trip_temp) { + if (tz->trips.hot.valid) + trip_index--; + + if (trip_index < 0) + return -EINVAL; + + acpi_trip = &tz->trips.passive.trip; + if (acpi_trip->valid && !trip_index--) { + t = tz->trips.passive.tc1 * (tz->temperature - + tz->last_temperature) + + tz->trips.passive.tc2 * (tz->temperature - + acpi_trip->temperature); + if (t > 0) *trend = THERMAL_TREND_RAISING; - return 0; - } else { - /* Fall back on default trend */ - return -EINVAL; - } + else if (t < 0) + *trend = THERMAL_TREND_DROPPING; + else + *trend = THERMAL_TREND_STABLE; + + return 0; } - /* - * tz->temperature has already been updated by generic thermal layer, - * before this callback being invoked - */ - i = tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature) + - tz->trips.passive.tc2 * (tz->temperature - tz->trips.passive.trip.temperature); - - if (i > 0) - *trend = THERMAL_TREND_RAISING; - else if (i < 0) - *trend = THERMAL_TREND_DROPPING; - else - *trend = THERMAL_TREND_STABLE; + t = acpi_thermal_temp(tz, tz->temperature); + + for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { + acpi_trip = &tz->trips.active[i].trip; + if (acpi_trip->valid && !trip_index--) { + if (t > acpi_thermal_temp(tz, acpi_trip->temperature)) { + *trend = THERMAL_TREND_RAISING; + return 0; + } + break; + } + } - return 0; + return -EINVAL; } static void acpi_thermal_zone_device_hot(struct thermal_zone_device *thermal)