/*
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*
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* (C) COPYRIGHT 2016-2017 ARM Limited. All rights reserved.
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*
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* This program is free software and is provided to you under the terms of the
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* GNU General Public License version 2 as published by the Free Software
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* Foundation, and any use by you of this program is subject to the terms
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* of such GNU licence.
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*
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* A copy of the licence is included with the program, and can also be obtained
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* from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#include <linux/thermal.h>
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#ifdef CONFIG_DEVFREQ_THERMAL
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#include <linux/devfreq_cooling.h>
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#endif
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#include <linux/of.h>
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#include <linux/math64.h>
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#include "mali_kbase.h"
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#include "mali_kbase_defs.h"
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/*
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* This model is primarily designed for the Juno platform. It may not be
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* suitable for other platforms. The additional resources in this model
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* should preferably be minimal, as this model is rarely used when a dynamic
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* model is available.
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*/
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/**
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* struct kbase_ipa_model_simple_data - IPA context per device
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* @dynamic_coefficient: dynamic coefficient of the model
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* @static_coefficient: static coefficient of the model
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* @ts: Thermal scaling coefficients of the model
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* @tz_name: Thermal zone name
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* @gpu_tz: thermal zone device
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*/
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struct kbase_ipa_model_simple_data {
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u32 dynamic_coefficient;
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u32 static_coefficient;
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s32 ts[4];
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char tz_name[16];
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struct thermal_zone_device *gpu_tz;
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};
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#define FALLBACK_STATIC_TEMPERATURE 55000
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/**
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* calculate_temp_scaling_factor() - Calculate temperature scaling coefficient
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* @ts: Signed coefficients, in order t^0 to t^3, with units Deg^-N
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* @t: Temperature, in mDeg C. Range: -2^17 < t < 2^17
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*
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* Scale the temperature according to a cubic polynomial whose coefficients are
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* provided in the device tree. The result is used to scale the static power
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* coefficient, where 1000000 means no change.
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*
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* Return: Temperature scaling factor. Approx range 0 < ret < 10,000,000.
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*/
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static u32 calculate_temp_scaling_factor(s32 ts[4], s64 t)
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{
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/* Range: -2^24 < t2 < 2^24 m(Deg^2) */
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u32 remainder;
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// static inline s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder)
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const s64 t2 = div_s64_rem((t * t), 1000, &remainder);
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/* Range: -2^31 < t3 < 2^31 m(Deg^3) */
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const s64 t3 = div_s64_rem((t * t2), 1000, &remainder);
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/*
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* Sum the parts. t^[1-3] are in m(Deg^N), but the coefficients are in
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* Deg^-N, so we need to multiply the last coefficient by 1000.
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* Range: -2^63 < res_big < 2^63
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*/
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const s64 res_big = ts[3] * t3 /* +/- 2^62 */
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+ ts[2] * t2 /* +/- 2^55 */
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+ ts[1] * t /* +/- 2^48 */
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+ ts[0] * 1000; /* +/- 2^41 */
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/* Range: -2^60 < res_unclamped < 2^60 */
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s64 res_unclamped = div_s64_rem(res_big, 1000, &remainder);
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/* Clamp to range of 0x to 10x the static power */
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return clamp(res_unclamped, (s64) 0, (s64) 10000000);
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}
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static int model_static_coeff(struct kbase_ipa_model *model, u32 *coeffp)
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{
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)
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unsigned long temp;
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#else
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int temp;
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#endif
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u32 temp_scaling_factor;
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struct kbase_ipa_model_simple_data *model_data =
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(struct kbase_ipa_model_simple_data *) model->model_data;
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struct thermal_zone_device *gpu_tz = model_data->gpu_tz;
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u64 coeffp_big;
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if (gpu_tz) {
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int ret;
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ret = gpu_tz->ops->get_temp(gpu_tz, &temp);
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if (ret) {
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pr_warn_ratelimited("Error reading temperature for gpu thermal zone: %d\n",
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ret);
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temp = FALLBACK_STATIC_TEMPERATURE;
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}
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} else {
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temp = FALLBACK_STATIC_TEMPERATURE;
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}
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temp_scaling_factor = calculate_temp_scaling_factor(model_data->ts,
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temp);
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coeffp_big = (u64)model_data->static_coefficient * temp_scaling_factor;
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*coeffp = div_u64(coeffp_big, 1000000);
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return 0;
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}
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static int model_dynamic_coeff(struct kbase_ipa_model *model, u32 *coeffp,
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u32 current_freq)
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{
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struct kbase_ipa_model_simple_data *model_data =
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(struct kbase_ipa_model_simple_data *) model->model_data;
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*coeffp = model_data->dynamic_coefficient;
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return 0;
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}
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static int add_params(struct kbase_ipa_model *model)
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{
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int err = 0;
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struct kbase_ipa_model_simple_data *model_data =
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(struct kbase_ipa_model_simple_data *)model->model_data;
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err = kbase_ipa_model_add_param_s32(model, "static-coefficient",
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&model_data->static_coefficient,
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1, true);
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if (err)
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goto end;
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err = kbase_ipa_model_add_param_s32(model, "dynamic-coefficient",
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&model_data->dynamic_coefficient,
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1, true);
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if (err)
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goto end;
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err = kbase_ipa_model_add_param_s32(model, "ts",
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model_data->ts, 4, true);
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if (err)
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goto end;
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err = kbase_ipa_model_add_param_string(model, "thermal-zone",
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model_data->tz_name,
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sizeof(model_data->tz_name), true);
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end:
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return err;
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}
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static int kbase_simple_power_model_init(struct kbase_ipa_model *model)
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{
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int err;
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struct kbase_ipa_model_simple_data *model_data;
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model_data = kzalloc(sizeof(struct kbase_ipa_model_simple_data),
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GFP_KERNEL);
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if (!model_data)
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return -ENOMEM;
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model->model_data = (void *) model_data;
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err = add_params(model);
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return err;
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}
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static int kbase_simple_power_model_recalculate(struct kbase_ipa_model *model)
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{
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struct kbase_ipa_model_simple_data *model_data =
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(struct kbase_ipa_model_simple_data *)model->model_data;
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if (!strnlen(model_data->tz_name, sizeof(model_data->tz_name))) {
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model_data->gpu_tz = NULL;
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} else {
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model_data->gpu_tz = thermal_zone_get_zone_by_name(model_data->tz_name);
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if (IS_ERR(model_data->gpu_tz)) {
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pr_warn_ratelimited("Error %ld getting thermal zone \'%s\', not yet ready?\n",
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PTR_ERR(model_data->gpu_tz),
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model_data->tz_name);
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model_data->gpu_tz = NULL;
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return -EPROBE_DEFER;
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}
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}
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return 0;
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}
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static void kbase_simple_power_model_term(struct kbase_ipa_model *model)
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{
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struct kbase_ipa_model_simple_data *model_data =
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(struct kbase_ipa_model_simple_data *)model->model_data;
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kfree(model_data);
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}
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struct kbase_ipa_model_ops kbase_simple_ipa_model_ops = {
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.name = "mali-simple-power-model",
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.init = &kbase_simple_power_model_init,
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.recalculate = &kbase_simple_power_model_recalculate,
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.term = &kbase_simple_power_model_term,
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.get_dynamic_coeff = &model_dynamic_coeff,
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.get_static_coeff = &model_static_coeff,
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.do_utilization_scaling_in_framework = true,
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};
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