| Jens Axboe | 8055e41 | 2012-11-26 08:43:47 +0100 | [diff] [blame] | 1 | #ifndef FIO_LFSR_H |
| 2 | #define FIO_LFSR_H |
| 3 | |
| 4 | #include <inttypes.h> |
| 5 | |
| Alex Pyrgiotis | d474cbc | 2013-03-08 14:37:03 +0200 | [diff] [blame] | 6 | #define FIO_MAX_TAPS 6 |
| Jens Axboe | 8055e41 | 2012-11-26 08:43:47 +0100 | [diff] [blame] | 7 | |
| 8 | struct lfsr_taps { |
| 9 | unsigned int length; |
| 10 | unsigned int taps[FIO_MAX_TAPS]; |
| 11 | }; |
| 12 | |
| 13 | |
| 14 | struct fio_lfsr { |
| Alex Pyrgiotis | d474cbc | 2013-03-08 14:37:03 +0200 | [diff] [blame] | 15 | uint64_t xormask; |
| Jens Axboe | 8055e41 | 2012-11-26 08:43:47 +0100 | [diff] [blame] | 16 | uint64_t last_val; |
| Alex Pyrgiotis | d474cbc | 2013-03-08 14:37:03 +0200 | [diff] [blame] | 17 | uint64_t cached_bit; |
| Jens Axboe | 8055e41 | 2012-11-26 08:43:47 +0100 | [diff] [blame] | 18 | uint64_t max_val; |
| 19 | uint64_t num_vals; |
| Alex Pyrgiotis | d474cbc | 2013-03-08 14:37:03 +0200 | [diff] [blame] | 20 | uint64_t cycle_length; |
| Alex Pyrgiotis | d0f8536 | 2013-03-12 10:28:35 +0200 | [diff] [blame] | 21 | uint64_t cached_cycle_length; |
| Alex Pyrgiotis | d474cbc | 2013-03-08 14:37:03 +0200 | [diff] [blame] | 22 | unsigned int spin; |
| Jens Axboe | 8055e41 | 2012-11-26 08:43:47 +0100 | [diff] [blame] | 23 | }; |
| 24 | |
| Jens Axboe | 7477673 | 2013-01-11 14:03:25 +0100 | [diff] [blame] | 25 | int lfsr_next(struct fio_lfsr *fl, uint64_t *off, uint64_t); |
| Alex Pyrgiotis | d474cbc | 2013-03-08 14:37:03 +0200 | [diff] [blame] | 26 | int lfsr_init(struct fio_lfsr *fl, uint64_t size, |
| 27 | unsigned long seed, unsigned int spin); |
| 28 | int lfsr_reset(struct fio_lfsr *fl, unsigned long seed); |
| Jens Axboe | 8055e41 | 2012-11-26 08:43:47 +0100 | [diff] [blame] | 29 | |
| 30 | #endif |