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ptp: Allow exposing cycles only for clocks with free-running counter

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The PTP core falls back to gettimex64 and getcrosststamp when
getcycles64 or getcyclesx64 are not implemented. This causes the CYCLES
ioctls to retrieve PHC real time instead of free-running cycles.

Reject PTP_SYS_OFFSET_{PRECISE,EXTENDED}_CYCLES for clocks without
free-running counter support since the result would represent PHC real
time and system time rather than cycles and system time.

Fixes: faf23f54d3 ("ptp: Add ioctl commands to expose raw cycle counter values")
Signed-off-by: Carolina Jubran <cjubran@nvidia.com>
Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Link: https://patch.msgid.link/20251029083813.2276997-1-cjubran@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Carolina Jubran
2025-10-29 10:38:13 +02:00
committed by Jakub Kicinski
parent 01534d73c5
commit 5a89b27afd
1 changed files with 4 additions and 0 deletions
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4
drivers/ptp/ptp_chardev.c
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@@ -561,10 +561,14 @@ long ptp_ioctl(struct posix_clock_context *pccontext, unsigned int cmd,
return ptp_mask_en_single(pccontext->private_clkdata, argptr);
case PTP_SYS_OFFSET_PRECISE_CYCLES:
if (!ptp->has_cycles)
return -EOPNOTSUPP;
return ptp_sys_offset_precise(ptp, argptr,
ptp->info->getcrosscycles);
case PTP_SYS_OFFSET_EXTENDED_CYCLES:
if (!ptp->has_cycles)
return -EOPNOTSUPP;
return ptp_sys_offset_extended(ptp, argptr,
ptp->info->getcyclesx64);
default: