On Fri, 21 Aug 2015, Christopher S. Hall wrote:
> From: Christopher Hall <christopher.s.h...@intel.com>
>
> Add getsynctime() PTP device callback to cross timestamp system device
> clock using ART translation depends on platform being >= SPT
> and having ART
>
> getsynctime() reads ART (TSC-derived)/device cross timestamp and
> converts to realtime/device time reporting cross timestamp to
> PTP driver
See patch 1/4
> index 25a0ad5..228f3f3 100644
> --- a/drivers/net/ethernet/intel/e1000e/ptp.c
> +++ b/drivers/net/ethernet/intel/e1000e/ptp.c
> @@ -25,6 +25,8 @@
> */
>
> #include "e1000.h"
> +#include <asm/tsc.h>
> +#include <linux/timekeeping.h>
The usual way to order includes is:
#include <linux/timekeeping.h>
#include <asm/tsc.h>
#include "e1000.h"
> +/**
> + * e1000e_phc_getsynctime - Reads the current time from the hardware clock
> and
> + * correlated system time
> + * @ptp: ptp clock structure
> + * @devts: timespec structure to hold the current device time value
> + * @systs: timespec structure to hold the current system time value
> + *
> + * Read device and system (ART) clock simultaneously and return the correct
> + * clock values in ns after converting into a struct timespec.
> + **/
> +static int e1000e_phc_getsynctime(struct ptp_clock_info *ptp,
> + struct timespec64 *devts,
> + struct timespec64 *systs)
> +{
> + struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter,
> + ptp_clock_info);
> + unsigned long flags;
> + u32 remainder;
> + struct correlated_ts art_correlated_ts;
> + u64 device_time;
> + int ret;
> +
> + art_correlated_ts.get_ts = e1000e_phc_get_ts;
> + art_correlated_ts.private = adapter;
> + ret = get_correlated_timestamp(&art_correlated_ts,
> + &art_timestamper);
Pointless line break
> + if (ret != 0)
> + goto bail;
What's the purpose of this goto?
if (ret)
return ret;
is completely sufficient.
> +
> + systs->tv_sec =
> + div_u64_rem(art_correlated_ts.system_real.tv64,
> + NSEC_PER_SEC, &remainder);
> + systs->tv_nsec = remainder;
ktime_to_timespec64() perhaps?
And please move that conversion to the ptp ioctl
> + spin_lock_irqsave(&adapter->systim_lock, flags);
> + device_time = timecounter_cyc2time(&adapter->tc,
> + art_correlated_ts.device_ts);
....
> + /* CPU must have ART and GBe must be from Sunrise Point or greater */
> + if (hw->mac.type < e1000_pch_spt || !cpu_has_art)
> + adapter->ptp_clock_info.getsynctime64 = NULL;
We do it the other way round. We leave the default NULL and update it
if we detect the feature.
Thanks,
tglx
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