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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clock.h (3838B)

      1/*
      2 * Copyright (c) 2017, Mellanox Technologies, Ltd.  All rights reserved.
      3 *
      4 * This software is available to you under a choice of one of two
      5 * licenses.  You may choose to be licensed under the terms of the GNU
      6 * General Public License (GPL) Version 2, available from the file
      7 * COPYING in the main directory of this source tree, or the
      8 * OpenIB.org BSD license below:
      9 *
     10 *     Redistribution and use in source and binary forms, with or
     11 *     without modification, are permitted provided that the following
     12 *     conditions are met:
     13 *
     14 *      - Redistributions of source code must retain the above
     15 *        copyright notice, this list of conditions and the following
     16 *        disclaimer.
     17 *
     18 *      - Redistributions in binary form must reproduce the above
     19 *        copyright notice, this list of conditions and the following
     20 *        disclaimer in the documentation and/or other materials
     21 *        provided with the distribution.
     22 *
     23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
     27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
     28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     30 * SOFTWARE.
     31 */
     32
     33#ifndef __LIB_CLOCK_H__
     34#define __LIB_CLOCK_H__
     35
     36static inline bool mlx5_is_real_time_rq(struct mlx5_core_dev *mdev)
     37{
     38	u8 rq_ts_format_cap = MLX5_CAP_GEN(mdev, rq_ts_format);
     39
     40	return (rq_ts_format_cap == MLX5_TIMESTAMP_FORMAT_CAP_REAL_TIME ||
     41		rq_ts_format_cap ==
     42			MLX5_TIMESTAMP_FORMAT_CAP_FREE_RUNNING_AND_REAL_TIME);
     43}
     44
     45static inline bool mlx5_is_real_time_sq(struct mlx5_core_dev *mdev)
     46{
     47	u8 sq_ts_format_cap = MLX5_CAP_GEN(mdev, sq_ts_format);
     48
     49	return (sq_ts_format_cap == MLX5_TIMESTAMP_FORMAT_CAP_REAL_TIME ||
     50		sq_ts_format_cap ==
     51			MLX5_TIMESTAMP_FORMAT_CAP_FREE_RUNNING_AND_REAL_TIME);
     52}
     53
     54typedef ktime_t (*cqe_ts_to_ns)(struct mlx5_clock *, u64);
     55
     56#if IS_ENABLED(CONFIG_PTP_1588_CLOCK)
     57void mlx5_init_clock(struct mlx5_core_dev *mdev);
     58void mlx5_cleanup_clock(struct mlx5_core_dev *mdev);
     59
     60static inline int mlx5_clock_get_ptp_index(struct mlx5_core_dev *mdev)
     61{
     62	return mdev->clock.ptp ? ptp_clock_index(mdev->clock.ptp) : -1;
     63}
     64
     65static inline ktime_t mlx5_timecounter_cyc2time(struct mlx5_clock *clock,
     66						u64 timestamp)
     67{
     68	struct mlx5_timer *timer = &clock->timer;
     69	unsigned int seq;
     70	u64 nsec;
     71
     72	do {
     73		seq = read_seqbegin(&clock->lock);
     74		nsec = timecounter_cyc2time(&timer->tc, timestamp);
     75	} while (read_seqretry(&clock->lock, seq));
     76
     77	return ns_to_ktime(nsec);
     78}
     79
     80#define REAL_TIME_TO_NS(hi, low) (((u64)hi) * NSEC_PER_SEC + ((u64)low))
     81
     82static inline ktime_t mlx5_real_time_cyc2time(struct mlx5_clock *clock,
     83					      u64 timestamp)
     84{
     85	u64 time = REAL_TIME_TO_NS(timestamp >> 32, timestamp & 0xFFFFFFFF);
     86
     87	return ns_to_ktime(time);
     88}
     89#else
     90static inline void mlx5_init_clock(struct mlx5_core_dev *mdev) {}
     91static inline void mlx5_cleanup_clock(struct mlx5_core_dev *mdev) {}
     92static inline int mlx5_clock_get_ptp_index(struct mlx5_core_dev *mdev)
     93{
     94	return -1;
     95}
     96
     97static inline ktime_t mlx5_timecounter_cyc2time(struct mlx5_clock *clock,
     98						u64 timestamp)
     99{
    100	return 0;
    101}
    102
    103static inline ktime_t mlx5_real_time_cyc2time(struct mlx5_clock *clock,
    104					      u64 timestamp)
    105{
    106	return 0;
    107}
    108#endif
    109
    110static inline cqe_ts_to_ns mlx5_rq_ts_translator(struct mlx5_core_dev *mdev)
    111{
    112	return mlx5_is_real_time_rq(mdev) ? mlx5_real_time_cyc2time :
    113					    mlx5_timecounter_cyc2time;
    114}
    115
    116static inline cqe_ts_to_ns mlx5_sq_ts_translator(struct mlx5_core_dev *mdev)
    117{
    118	return mlx5_is_real_time_sq(mdev) ? mlx5_real_time_cyc2time :
    119					    mlx5_timecounter_cyc2time;
    120}
    121#endif