linux-kernel - [PATCH] Add support for pebs fmt6(Lunar Lake)

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Message-ID: <20241226085605.43208-1-victoryang00@ucsc.edu>
Date: Thu, 26 Dec 2024 16:56:05 +0800
From: Yiwei Yang <yangyiwei2000@...il.com>
To: linux-kernel@...r.kernel.org
Cc: linux-perf-users@...r.kernel.org,
	hpa@...or.com,
	bp@...en8.de,
	tglx@...utronix.de,
	kan.liang@...ux.intel.com,
	adrian.hunter@...el.com,
	irogers@...gle.com,
	jolsa@...nel.org,
	alexander.shishkin@...ux.intel.com,
	mark.rutland@....com,
	namhyung@...nel.org,
	acme@...nel.org,
	mingo@...hat.com,
	peterz@...radead.org,
	Yiwei Yang <victoryang00@...c.edu>
Subject: [PATCH] Add support for pebs fmt6(Lunar Lake)

Signed-off-by: Yiwei Yang <victoryang00@...c.edu>

Lunar lake's pebs is not kernel ready. in dmesg I found

victoryang00@...toryang00-ASUS-Zenbook-S-14-UX5406SA-UX5406SA:~$ sudo dmesg|grep PMU
[sudo] password for victoryang00: 
[    0.107418] Performance Events: XSAVE Architectural LBR, no PEBS fmt6+,  AnyThread deprecated, Lunarlake Hybrid events, 32-deep LBR, full-width counters, Intel PMU driver.
[    0.107418] core: cpu_core PMU driver: 
[    0.107418] NMI watchdog: Enabled. Permanently consumes one hw-PMU counter.
[    0.007380] core: cpu_atom PMU driver: 
[    2.802582] RAPL PMU: API unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
[    2.802585] RAPL PMU: hw unit of domain pp0-core 2^-14 Joules
[    2.802586] RAPL PMU: hw unit of domain package 2^-14 Joules
[    2.802587] RAPL PMU: hw unit of domain dram 2^-14 Joules
[    2.802587] RAPL PMU: hw unit of domain pp1-gpu 2^-14 Joules

But lunar lake has the pebs extension in lscpu

    Flags:                fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge m
                          ca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 s
                          s ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc 
                          art arch_perfmon pebs bts rep_good nopl xtopology nons
                          top_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq 
                          dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma c
                          x16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt t
                          sc_deadline_timer aes xsave avx f16c rdrand lahf_lm ab
                          m 3dnowprefetch cpuid_fault epb ssbd ibrs ibpb stibp i
                          brs_enhanced tpr_shadow flexpriority ept vpid ept_ad f
                          sgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid rd
                          t_a rdseed adx smap clflushopt clwb intel_pt sha_ni xs
                          aveopt xsavec xgetbv1 xsaves split_lock_detect avx_vnn
                          i lam wbnoinvd dtherm ida arat pln pts hwp hwp_notify 
                          hwp_act_window hwp_epp hwp_pkg_req hfi vnmi umip pku o
                          spke waitpkg gfni vaes vpclmulqdq rdpid bus_lock_detec
                          t movdiri movdir64b fsrm md_clear serialize pconfig ar
                          ch_lbr ibt flush_l1d arch_capabilities


But I found implementation [1] and [2].

The code in the kernel seems not updated [3].

[1] https://github.com/search?q=repo%3Atorvalds%2Flinux%20MSR_IA32_PMC_V6_FX0_CTR&type=code 
[2] https://lwn.net/ml/all/20240625182256.291914-9-kan.liang@linux.intel.com/
[3] https://elixir.bootlin.com/linux/v6.13-rc3/source/arch/x86/events/intel/ds.c#L2480