On Thu, 4 Aug 2022 13:18:52 +0530, Kajol Jain wrote:
> Commit 4c08d4bbc089 ("powerpc/papr_scm: Add perf interface support")
> added performance monitoring support for papr-scm nvdimm devices via
> perf interface. Commit also added an array in papr_scm_priv
> structure called "nvdimm_events_map", which got filled based on the
> result of H_SCM_PERFORMANCE_STATS hcall.
>
> Currently there is an assumption that the order of events in the
> stats buffer, returned by the hypervisor is same. And order also
> happens to matches with the events specified in nvdimm driver code.
> But this assumption is not documented in Power Architecture
> Platform Requirements (PAPR) document. Although the order
> of events happens to be same on current generation od system, but
> it might not be true in future generation systems. Fix the issue, by
> adding a static mapping for nvdimm events to corresponding stat-id,
> and removing the dynamic map from papr_scm_priv structure. Also
> remove the function papr_scm_pmu_check_events from papr_scm.c file,
> as we no longer need to copy stat-ids dynamically.
>
> [...]
Applied to powerpc/fixes.
[1/1] powerpc/papr_scm: Fix nvdimm event mappings
https://git.kernel.org/powerpc/c/9b1ac04698a4bfec146322502cdcd9904c1777fa
cheers
