Eric Lee / smarc-fsl-linux-kernel

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lib/dim/dim.c 2.08 KB
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4f75da366   Tal Gilboa   linux/dim: Move i... 
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  // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
  /*
   * Copyright (c) 2019, Mellanox Technologies inc.  All rights reserved.
   */
  
  #include <linux/dim.h>
  
  bool dim_on_top(struct dim *dim)
  {
  	switch (dim->tune_state) {
  	case DIM_PARKING_ON_TOP:
  	case DIM_PARKING_TIRED:
  		return true;
  	case DIM_GOING_RIGHT:
  		return (dim->steps_left > 1) && (dim->steps_right == 1);
  	default: /* DIM_GOING_LEFT */
  		return (dim->steps_right > 1) && (dim->steps_left == 1);
  	}
  }
  EXPORT_SYMBOL(dim_on_top);
  
  void dim_turn(struct dim *dim)
  {
  	switch (dim->tune_state) {
  	case DIM_PARKING_ON_TOP:
  	case DIM_PARKING_TIRED:
  		break;
  	case DIM_GOING_RIGHT:
  		dim->tune_state = DIM_GOING_LEFT;
  		dim->steps_left = 0;
  		break;
  	case DIM_GOING_LEFT:
  		dim->tune_state = DIM_GOING_RIGHT;
  		dim->steps_right = 0;
  		break;
  	}
  }
  EXPORT_SYMBOL(dim_turn);
  
  void dim_park_on_top(struct dim *dim)
  {
  	dim->steps_right  = 0;
  	dim->steps_left   = 0;
  	dim->tired        = 0;
  	dim->tune_state   = DIM_PARKING_ON_TOP;
  }
  EXPORT_SYMBOL(dim_park_on_top);
  
  void dim_park_tired(struct dim *dim)
  {
  	dim->steps_right  = 0;
  	dim->steps_left   = 0;
  	dim->tune_state   = DIM_PARKING_TIRED;
  }
  EXPORT_SYMBOL(dim_park_tired);
  
  void dim_calc_stats(struct dim_sample *start, struct dim_sample *end,
  		    struct dim_stats *curr_stats)
  {
  	/* u32 holds up to 71 minutes, should be enough */
  	u32 delta_us = ktime_us_delta(end->time, start->time);
  	u32 npkts = BIT_GAP(BITS_PER_TYPE(u32), end->pkt_ctr, start->pkt_ctr);
  	u32 nbytes = BIT_GAP(BITS_PER_TYPE(u32), end->byte_ctr,
  			     start->byte_ctr);
398c2b05b   Yamin Friedman   linux/dim: Add co... 
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  	u32 ncomps = BIT_GAP(BITS_PER_TYPE(u32), end->comp_ctr,
  			     start->comp_ctr);
4f75da366   Tal Gilboa   linux/dim: Move i... 
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  	if (!delta_us)
  		return;
  
  	curr_stats->ppms = DIV_ROUND_UP(npkts * USEC_PER_MSEC, delta_us);
  	curr_stats->bpms = DIV_ROUND_UP(nbytes * USEC_PER_MSEC, delta_us);
  	curr_stats->epms = DIV_ROUND_UP(DIM_NEVENTS * USEC_PER_MSEC,
  					delta_us);
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  	curr_stats->cpms = DIV_ROUND_UP(ncomps * USEC_PER_MSEC, delta_us);
  	if (curr_stats->epms != 0)
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  		curr_stats->cpe_ratio = DIV_ROUND_DOWN_ULL(
  			curr_stats->cpms * 100, curr_stats->epms);
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  	else
  		curr_stats->cpe_ratio = 0;
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  }
  EXPORT_SYMBOL(dim_calc_stats);