diff options
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx4/en_clock.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx4/en_clock.c | 43 |
1 files changed, 20 insertions, 23 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_clock.c b/drivers/net/ethernet/mellanox/mlx4/en_clock.c index 015198c14fa8..e7b81a305469 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_clock.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_clock.c @@ -62,12 +62,13 @@ void mlx4_en_fill_hwtstamps(struct mlx4_en_dev *mdev, struct skb_shared_hwtstamps *hwts, u64 timestamp) { - unsigned long flags; + unsigned int seq; u64 nsec; - read_lock_irqsave(&mdev->clock_lock, flags); - nsec = timecounter_cyc2time(&mdev->clock, timestamp); - read_unlock_irqrestore(&mdev->clock_lock, flags); + do { + seq = read_seqbegin(&mdev->clock_lock); + nsec = timecounter_cyc2time(&mdev->clock, timestamp); + } while (read_seqretry(&mdev->clock_lock, seq)); memset(hwts, 0, sizeof(struct skb_shared_hwtstamps)); hwts->hwtstamp = ns_to_ktime(nsec); @@ -95,9 +96,9 @@ void mlx4_en_ptp_overflow_check(struct mlx4_en_dev *mdev) unsigned long flags; if (timeout) { - write_lock_irqsave(&mdev->clock_lock, flags); + write_seqlock_irqsave(&mdev->clock_lock, flags); timecounter_read(&mdev->clock); - write_unlock_irqrestore(&mdev->clock_lock, flags); + write_sequnlock_irqrestore(&mdev->clock_lock, flags); mdev->last_overflow_check = jiffies; } } @@ -128,10 +129,10 @@ static int mlx4_en_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta) adj *= delta; diff = div_u64(adj, 1000000000ULL); - write_lock_irqsave(&mdev->clock_lock, flags); + write_seqlock_irqsave(&mdev->clock_lock, flags); timecounter_read(&mdev->clock); mdev->cycles.mult = neg_adj ? mult - diff : mult + diff; - write_unlock_irqrestore(&mdev->clock_lock, flags); + write_sequnlock_irqrestore(&mdev->clock_lock, flags); return 0; } @@ -149,9 +150,9 @@ static int mlx4_en_phc_adjtime(struct ptp_clock_info *ptp, s64 delta) ptp_clock_info); unsigned long flags; - write_lock_irqsave(&mdev->clock_lock, flags); + write_seqlock_irqsave(&mdev->clock_lock, flags); timecounter_adjtime(&mdev->clock, delta); - write_unlock_irqrestore(&mdev->clock_lock, flags); + write_sequnlock_irqrestore(&mdev->clock_lock, flags); return 0; } @@ -172,9 +173,9 @@ static int mlx4_en_phc_gettime(struct ptp_clock_info *ptp, unsigned long flags; u64 ns; - write_lock_irqsave(&mdev->clock_lock, flags); + write_seqlock_irqsave(&mdev->clock_lock, flags); ns = timecounter_read(&mdev->clock); - write_unlock_irqrestore(&mdev->clock_lock, flags); + write_sequnlock_irqrestore(&mdev->clock_lock, flags); *ts = ns_to_timespec64(ns); @@ -198,9 +199,9 @@ static int mlx4_en_phc_settime(struct ptp_clock_info *ptp, unsigned long flags; /* reset the timecounter */ - write_lock_irqsave(&mdev->clock_lock, flags); + write_seqlock_irqsave(&mdev->clock_lock, flags); timecounter_init(&mdev->clock, &mdev->cycles, ns); - write_unlock_irqrestore(&mdev->clock_lock, flags); + write_sequnlock_irqrestore(&mdev->clock_lock, flags); return 0; } @@ -245,13 +246,9 @@ static u32 freq_to_shift(u16 freq) { u32 freq_khz = freq * 1000; u64 max_val_cycles = freq_khz * 1000 * MLX4_EN_WRAP_AROUND_SEC; - u64 tmp_rounded = - roundup_pow_of_two(max_val_cycles) > max_val_cycles ? - roundup_pow_of_two(max_val_cycles) - 1 : UINT_MAX; - u64 max_val_cycles_rounded = is_power_of_2(max_val_cycles + 1) ? - max_val_cycles : tmp_rounded; + u64 max_val_cycles_rounded = 1ULL << fls64(max_val_cycles - 1); /* calculate max possible multiplier in order to fit in 64bit */ - u64 max_mul = div_u64(0xffffffffffffffffULL, max_val_cycles_rounded); + u64 max_mul = div64_u64(ULLONG_MAX, max_val_cycles_rounded); /* This comes from the reverse of clocksource_khz2mult */ return ilog2(div_u64(max_mul * freq_khz, 1000000)); @@ -270,7 +267,7 @@ void mlx4_en_init_timestamp(struct mlx4_en_dev *mdev) if (mdev->ptp_clock) return; - rwlock_init(&mdev->clock_lock); + seqlock_init(&mdev->clock_lock); memset(&mdev->cycles, 0, sizeof(mdev->cycles)); mdev->cycles.read = mlx4_en_read_clock; @@ -280,10 +277,10 @@ void mlx4_en_init_timestamp(struct mlx4_en_dev *mdev) clocksource_khz2mult(1000 * dev->caps.hca_core_clock, mdev->cycles.shift); mdev->nominal_c_mult = mdev->cycles.mult; - write_lock_irqsave(&mdev->clock_lock, flags); + write_seqlock_irqsave(&mdev->clock_lock, flags); timecounter_init(&mdev->clock, &mdev->cycles, ktime_to_ns(ktime_get_real())); - write_unlock_irqrestore(&mdev->clock_lock, flags); + write_sequnlock_irqrestore(&mdev->clock_lock, flags); /* Calculate period in seconds to call the overflow watchdog - to make * sure counter is checked at least once every wrap around. |
