iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

perf/x86/amd/uncore: Add PerfMonV2 RDPMC assignments

Browse Source 
The current RDPMC assignment scheme maps four DF PMCs and
six L3 PMCs from index 6 to 15.

If AMD Performance Monitoring Version 2 (PerfMonV2) is
supported, there may be additional DF counters available
which are mapped starting from index 16 i.e. just after
the L3 counters. Update the RDPMC assignments accordingly.

Signed-off-by: Sandipan Das <sandipan.das@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/1359379ef34da760f108b075ac138ab082caa3ba.1652954372.git.sandipan.das@amd.com
This commit is contained in:
Sandipan Das 2022-05-19 15:33:34 +05:30 committed by Peter Zijlstra
parent c390241a93
commit f0fe9f3c7a
1 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
arch/x86/events/amd/uncore.c
View File

@ -158,6 +158,16 @@ out:
hwc->event_base_rdpmc = uncore->rdpmc_base + hwc->idx;
hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
/*
* The first four DF counters are accessible via RDPMC index 6 to 9
* followed by the L3 counters from index 10 to 15. For processors
* with more than four DF counters, the DF RDPMC assignments become
* discontiguous as the additional counters are accessible starting
* from index 16.
*/
if (is_nb_event(event) && hwc->idx >= NUM_COUNTERS_NB)
hwc->event_base_rdpmc += NUM_COUNTERS_L3;
if (flags & PERF_EF_START)
amd_uncore_start(event, PERF_EF_RELOAD);