This series removes the use of the heavy-weight PTP hardware semaphore in the gettimex64 path. Instead, serialization of access to the time register is done using a host-side spinlock. The timer hardware is shared between PFs on the PCI adapter, so the spinlock must be shared between ice_pf instances too.
Replacing the PTP hardware semaphore entirely with a mutex is also possible and you can see it done in my git branch[1], but I am not posting those patches yet to keep the scope of this series limited. [1] https://gitlab.com/mschmidt2/linux/-/commits/ice-ptp-host-side-lock-10 v4: - Patch 1: Use named GENMASK macros and FIELD_PREP. v3: - Longer variable name ("a" -> "adapter"). - Propagate xarray error in ice_adapter_get with ERR_PTR. - Added kernel-doc comments for ice_adapter_{get,put}. v2: - Patch 1: Rely on xarray's own lock. (Suggested by Jiri Pirko) - Patch 2: Do not use *_irqsave with ptp_gltsyn_time_lock, as it's used only in process contexts. Michal Schmidt (3): ice: add ice_adapter for shared data across PFs on the same NIC ice: avoid the PTP hardware semaphore in gettimex64 path ice: fold ice_ptp_read_time into ice_ptp_gettimex64 drivers/net/ethernet/intel/ice/Makefile | 3 +- drivers/net/ethernet/intel/ice/ice.h | 2 + drivers/net/ethernet/intel/ice/ice_adapter.c | 116 +++++++++++++++++++ drivers/net/ethernet/intel/ice/ice_adapter.h | 28 +++++ drivers/net/ethernet/intel/ice/ice_main.c | 8 ++ drivers/net/ethernet/intel/ice/ice_ptp.c | 33 +----- drivers/net/ethernet/intel/ice/ice_ptp_hw.c | 3 + 7 files changed, 163 insertions(+), 30 deletions(-) create mode 100644 drivers/net/ethernet/intel/ice/ice_adapter.c create mode 100644 drivers/net/ethernet/intel/ice/ice_adapter.h -- 2.43.2
