cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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dim.c (2126B)

      1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
      2/*
      3 * Copyright (c) 2019, Mellanox Technologies inc.  All rights reserved.
      4 */
      5
      6#include <linux/dim.h>
      7
      8bool dim_on_top(struct dim *dim)
      9{
     10	switch (dim->tune_state) {
     11	case DIM_PARKING_ON_TOP:
     12	case DIM_PARKING_TIRED:
     13		return true;
     14	case DIM_GOING_RIGHT:
     15		return (dim->steps_left > 1) && (dim->steps_right == 1);
     16	default: /* DIM_GOING_LEFT */
     17		return (dim->steps_right > 1) && (dim->steps_left == 1);
     18	}
     19}
     20EXPORT_SYMBOL(dim_on_top);
     21
     22void dim_turn(struct dim *dim)
     23{
     24	switch (dim->tune_state) {
     25	case DIM_PARKING_ON_TOP:
     26	case DIM_PARKING_TIRED:
     27		break;
     28	case DIM_GOING_RIGHT:
     29		dim->tune_state = DIM_GOING_LEFT;
     30		dim->steps_left = 0;
     31		break;
     32	case DIM_GOING_LEFT:
     33		dim->tune_state = DIM_GOING_RIGHT;
     34		dim->steps_right = 0;
     35		break;
     36	}
     37}
     38EXPORT_SYMBOL(dim_turn);
     39
     40void dim_park_on_top(struct dim *dim)
     41{
     42	dim->steps_right  = 0;
     43	dim->steps_left   = 0;
     44	dim->tired        = 0;
     45	dim->tune_state   = DIM_PARKING_ON_TOP;
     46}
     47EXPORT_SYMBOL(dim_park_on_top);
     48
     49void dim_park_tired(struct dim *dim)
     50{
     51	dim->steps_right  = 0;
     52	dim->steps_left   = 0;
     53	dim->tune_state   = DIM_PARKING_TIRED;
     54}
     55EXPORT_SYMBOL(dim_park_tired);
     56
     57void dim_calc_stats(struct dim_sample *start, struct dim_sample *end,
     58		    struct dim_stats *curr_stats)
     59{
     60	/* u32 holds up to 71 minutes, should be enough */
     61	u32 delta_us = ktime_us_delta(end->time, start->time);
     62	u32 npkts = BIT_GAP(BITS_PER_TYPE(u32), end->pkt_ctr, start->pkt_ctr);
     63	u32 nbytes = BIT_GAP(BITS_PER_TYPE(u32), end->byte_ctr,
     64			     start->byte_ctr);
     65	u32 ncomps = BIT_GAP(BITS_PER_TYPE(u32), end->comp_ctr,
     66			     start->comp_ctr);
     67
     68	if (!delta_us)
     69		return;
     70
     71	curr_stats->ppms = DIV_ROUND_UP(npkts * USEC_PER_MSEC, delta_us);
     72	curr_stats->bpms = DIV_ROUND_UP(nbytes * USEC_PER_MSEC, delta_us);
     73	curr_stats->epms = DIV_ROUND_UP(DIM_NEVENTS * USEC_PER_MSEC,
     74					delta_us);
     75	curr_stats->cpms = DIV_ROUND_UP(ncomps * USEC_PER_MSEC, delta_us);
     76	if (curr_stats->epms != 0)
     77		curr_stats->cpe_ratio = DIV_ROUND_DOWN_ULL(
     78			curr_stats->cpms * 100, curr_stats->epms);
     79	else
     80		curr_stats->cpe_ratio = 0;
     81
     82}
     83EXPORT_SYMBOL(dim_calc_stats);