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 
36 static 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_RQ_TIMESTAMP_FORMAT_CAP_REAL_TIME  ||
41 		rq_ts_format_cap == MLX5_RQ_TIMESTAMP_FORMAT_CAP_FREE_RUNNING_AND_REAL_TIME);
42 }
43 
44 static inline bool mlx5_is_real_time_sq(struct mlx5_core_dev *mdev)
45 {
46 	u8 sq_ts_format_cap = MLX5_CAP_GEN(mdev, sq_ts_format);
47 
48 	return (sq_ts_format_cap == MLX5_SQ_TIMESTAMP_FORMAT_CAP_REAL_TIME  ||
49 		sq_ts_format_cap == MLX5_SQ_TIMESTAMP_FORMAT_CAP_FREE_RUNNING_AND_REAL_TIME);
50 }
51 
52 typedef ktime_t (*cqe_ts_to_ns)(struct mlx5_clock *, u64);
53 
54 #if IS_ENABLED(CONFIG_PTP_1588_CLOCK)
55 void mlx5_init_clock(struct mlx5_core_dev *mdev);
56 void mlx5_cleanup_clock(struct mlx5_core_dev *mdev);
57 
58 static inline int mlx5_clock_get_ptp_index(struct mlx5_core_dev *mdev)
59 {
60 	return mdev->clock.ptp ? ptp_clock_index(mdev->clock.ptp) : -1;
61 }
62 
63 static inline ktime_t mlx5_timecounter_cyc2time(struct mlx5_clock *clock,
64 						u64 timestamp)
65 {
66 	struct mlx5_timer *timer = &clock->timer;
67 	unsigned int seq;
68 	u64 nsec;
69 
70 	do {
71 		seq = read_seqbegin(&clock->lock);
72 		nsec = timecounter_cyc2time(&timer->tc, timestamp);
73 	} while (read_seqretry(&clock->lock, seq));
74 
75 	return ns_to_ktime(nsec);
76 }
77 
78 #define REAL_TIME_TO_NS(hi, low) (((u64)hi) * NSEC_PER_SEC + ((u64)low))
79 
80 static inline ktime_t mlx5_real_time_cyc2time(struct mlx5_clock *clock,
81 					      u64 timestamp)
82 {
83 	u64 time = REAL_TIME_TO_NS(timestamp >> 32, timestamp & 0xFFFFFFFF);
84 
85 	return ns_to_ktime(time);
86 }
87 #else
88 static inline void mlx5_init_clock(struct mlx5_core_dev *mdev) {}
89 static inline void mlx5_cleanup_clock(struct mlx5_core_dev *mdev) {}
90 static inline int mlx5_clock_get_ptp_index(struct mlx5_core_dev *mdev)
91 {
92 	return -1;
93 }
94 
95 static inline ktime_t mlx5_timecounter_cyc2time(struct mlx5_clock *clock,
96 						u64 timestamp)
97 {
98 	return 0;
99 }
100 
101 static inline ktime_t mlx5_real_time_cyc2time(struct mlx5_clock *clock,
102 					      u64 timestamp)
103 {
104 	return 0;
105 }
106 #endif
107 
108 #endif
109