mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-12-28 16:56:26 +00:00
a865276872
Make the start and end arguments to dim_calc_stats() const pointers to clarify that the function does not modify their values. Signed-off-by: Caleb Sander Mateos <csander@purestorage.com> Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com> Reviewed-by: Arthur Kiyanovski <akiyano@amazon.com> Link: https://patch.msgid.link/20241031002326.3426181-1-csander@purestorage.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
// 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);
|
|
|
|
bool dim_calc_stats(const struct dim_sample *start,
|
|
const 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);
|
|
u32 ncomps = BIT_GAP(BITS_PER_TYPE(u32), end->comp_ctr,
|
|
start->comp_ctr);
|
|
|
|
if (!delta_us)
|
|
return false;
|
|
|
|
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);
|
|
curr_stats->cpms = DIV_ROUND_UP(ncomps * USEC_PER_MSEC, delta_us);
|
|
if (curr_stats->epms != 0)
|
|
curr_stats->cpe_ratio = DIV_ROUND_DOWN_ULL(
|
|
curr_stats->cpms * 100, curr_stats->epms);
|
|
else
|
|
curr_stats->cpe_ratio = 0;
|
|
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL(dim_calc_stats);
|
|
|
|
MODULE_DESCRIPTION("Dynamic Interrupt Moderation (DIM) library");
|
|
MODULE_LICENSE("Dual BSD/GPL");
|