Re: [PATCH 0/2] hwpmc_amd: fix MSR offset calculation and DF counter sharing
- In reply to: Paulo Fragoso : "[PATCH 0/2] hwpmc_amd: fix MSR offset calculation and DF counter sharing"
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Date: Sun, 01 Mar 2026 18:49:25 UTC
I have also submitted these patches to Phabricator at https://reviews.freebsd.org/D55607 for formal review. Em 01/03/2026 10:50, Paulo Fragoso escreveu: > Hello! > > These two patches fix regressions in the hwpmc AMD driver introduced > by the Netflix commit 37bba2ad92d8 (2026-02-01), which refactored the > driver from a static counter table to dynamic CPUID-based detection. > > Patch 1 fixes amd_get_msr() MSR offset calculation for newer AMD > counter bases (Core, L3, Data Fabric), verified on AMD Ryzen 5600X. > > Patch 2 fixes Data Fabric counter MSR sharing in amd_pcpu_init(), > honoring the per-package sharing requirement documented in AMD PPR > 57930-A0 section 2.1.9 [Register Sharing]. > > Both patches tested on AMD Ryzen 5600X (Family 19h, Zen 3), > FreeBSD 16.0-CURRENT. > > Paulo Fragoso (2): > hwpmc_amd: fix amd_get_msr() MSR offset for newer counter bases > hwpmc_amd: fix DF counter MSR sharing in amd_pcpu_init() > > sys/dev/hwpmc/hwpmc_amd.c | 38 +++++++++++++++++++++++++++++++++++--- > 1 file changed, 35 insertions(+), 3 deletions(-) > > -- > 2.53.0 >