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Date: Thu, 13 Jan 2022 20:14:32 +0100
From: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
Huang Rui <ray.huang@....com>
CC: Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
"Adrian Hunter" <adrian.hunter@...el.com>,
Ian Rogers <irogers@...gle.com>,
"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
<linux-perf-users@...r.kernel.org>
Subject: Re: [PATCH 1/1 FYI] tools arch x86: Sync the msr-index.h copy with
the kernel sources
On 1/13/2022 3:25 PM, Arnaldo Carvalho de Melo wrote:
> To pick up the changes in:
>
> 89aa94b4a218339b ("x86/msr: Add AMD CPPC MSR definitions")
>
> Addressing these tools/perf build warnings:
>
> diff -u tools/arch/x86/include/asm/msr-index.h arch/x86/include/asm/msr-index.h
> Warning: Kernel ABI header at 'tools/arch/x86/include/asm/msr-index.h' differs from latest version at 'arch/x86/include/asm/msr-index.h'
>
> That makes the beautification scripts to pick some new entries:
>
> $ tools/perf/trace/beauty/tracepoints/x86_msr.sh > before
> $ cp arch/x86/include/asm/msr-index.h tools/arch/x86/include/asm/msr-index.h
> $ tools/perf/trace/beauty/tracepoints/x86_msr.sh > after
> $ diff -u before after
> --- before 2022-01-13 10:59:51.743416890 -0300
> +++ after 2022-01-13 11:00:00.776644178 -0300
> @@ -303,6 +303,11 @@
> [0xc0010299 - x86_AMD_V_KVM_MSRs_offset] = "AMD_RAPL_POWER_UNIT",
> [0xc001029a - x86_AMD_V_KVM_MSRs_offset] = "AMD_CORE_ENERGY_STATUS",
> [0xc001029b - x86_AMD_V_KVM_MSRs_offset] = "AMD_PKG_ENERGY_STATUS",
> + [0xc00102b0 - x86_AMD_V_KVM_MSRs_offset] = "AMD_CPPC_CAP1",
> + [0xc00102b1 - x86_AMD_V_KVM_MSRs_offset] = "AMD_CPPC_ENABLE",
> + [0xc00102b2 - x86_AMD_V_KVM_MSRs_offset] = "AMD_CPPC_CAP2",
> + [0xc00102b3 - x86_AMD_V_KVM_MSRs_offset] = "AMD_CPPC_REQ",
> + [0xc00102b4 - x86_AMD_V_KVM_MSRs_offset] = "AMD_CPPC_STATUS",
> [0xc00102f0 - x86_AMD_V_KVM_MSRs_offset] = "AMD_PPIN_CTL",
> [0xc00102f1 - x86_AMD_V_KVM_MSRs_offset] = "AMD_PPIN",
> };
> $
>
> And this gets rebuilt:
>
> CC /tmp/build/perf/trace/beauty/tracepoints/x86_msr.o
> INSTALL trace_plugins
> LD /tmp/build/perf/trace/beauty/tracepoints/perf-in.o
> LD /tmp/build/perf/trace/beauty/perf-in.o
> LD /tmp/build/perf/perf-in.o
> LINK /tmp/build/perf/perf
>
> Now one can trace systemwide asking to see backtraces to where those
> MSRs are being read/written with:
>
> # perf trace -e msr:*_msr/max-stack=32/ --filter="msr>=AMD_CPPC_CAP1 && msr<="
> Failed to set filter "(msr>=0xc00102b0 && msr<=) && (common_pid != 2612094 && common_pid != 3841)" on event msr:read_msr with 22 (Invalid argument)
> # ^C
>
> If we use -v (verbose mode) we can see what it does behind the scenes:
>
> # perf trace -v -e msr:*_msr/max-stack=32/ --filter="msr>=AMD_CPPC_CAP1 && msr<=AMD_CPPC_STATUS"
> <SNIP>
> New filter for msr:read_msr: (msr>=0xc00102b0 && msr<=0xc00102b4) && (common_pid != 2612102 && common_pid != 3841)
> New filter for msr:write_msr: (msr>=0xc00102b0 && msr<=0xc00102b4) && (common_pid != 2612102 && common_pid != 3841)
> <SNIP>
> ^C[root@...e ~]#
>
> Example with a frequent msr:
>
> # perf trace -v -e msr:*_msr/max-stack=32/ --filter="msr==IA32_SPEC_CTRL" --max-events 2
> Using CPUID AuthenticAMD-25-21-0
> 0x48
> New filter for msr:read_msr: (msr==0x48) && (common_pid != 2612129 && common_pid != 3841)
> 0x48
> New filter for msr:write_msr: (msr==0x48) && (common_pid != 2612129 && common_pid != 3841)
> mmap size 528384B
> Looking at the vmlinux_path (8 entries long)
> symsrc__init: build id mismatch for vmlinux.
> Using /proc/kcore for kernel data
> Using /proc/kallsyms for symbols
> 0.000 Timer/2525383 msr:write_msr(msr: IA32_SPEC_CTRL, val: 6)
> do_trace_write_msr ([kernel.kallsyms])
> do_trace_write_msr ([kernel.kallsyms])
> __switch_to_xtra ([kernel.kallsyms])
> __switch_to ([kernel.kallsyms])
> __schedule ([kernel.kallsyms])
> schedule ([kernel.kallsyms])
> futex_wait_queue_me ([kernel.kallsyms])
> futex_wait ([kernel.kallsyms])
> do_futex ([kernel.kallsyms])
> __x64_sys_futex ([kernel.kallsyms])
> do_syscall_64 ([kernel.kallsyms])
> entry_SYSCALL_64_after_hwframe ([kernel.kallsyms])
> __futex_abstimed_wait_common64 (/usr/lib64/libpthread-2.33.so)
> 0.030 :0/0 msr:write_msr(msr: IA32_SPEC_CTRL, val: 2)
> do_trace_write_msr ([kernel.kallsyms])
> do_trace_write_msr ([kernel.kallsyms])
> __switch_to_xtra ([kernel.kallsyms])
> __switch_to ([kernel.kallsyms])
> __schedule ([kernel.kallsyms])
> schedule_idle ([kernel.kallsyms])
> do_idle ([kernel.kallsyms])
> cpu_startup_entry ([kernel.kallsyms])
> secondary_startup_64_no_verify ([kernel.kallsyms])
> #
>
> Cc: Huang Rui <ray.huang@....com>
> Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
> tools/arch/x86/include/asm/msr-index.h | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/tools/arch/x86/include/asm/msr-index.h b/tools/arch/x86/include/asm/msr-index.h
> index 01e2650b958591e0..3faf0f97edb1bcd3 100644
> --- a/tools/arch/x86/include/asm/msr-index.h
> +++ b/tools/arch/x86/include/asm/msr-index.h
> @@ -486,6 +486,23 @@
>
> #define MSR_AMD64_VIRT_SPEC_CTRL 0xc001011f
>
> +/* AMD Collaborative Processor Performance Control MSRs */
> +#define MSR_AMD_CPPC_CAP1 0xc00102b0
> +#define MSR_AMD_CPPC_ENABLE 0xc00102b1
> +#define MSR_AMD_CPPC_CAP2 0xc00102b2
> +#define MSR_AMD_CPPC_REQ 0xc00102b3
> +#define MSR_AMD_CPPC_STATUS 0xc00102b4
> +
> +#define AMD_CPPC_LOWEST_PERF(x) (((x) >> 0) & 0xff)
> +#define AMD_CPPC_LOWNONLIN_PERF(x) (((x) >> 8) & 0xff)
> +#define AMD_CPPC_NOMINAL_PERF(x) (((x) >> 16) & 0xff)
> +#define AMD_CPPC_HIGHEST_PERF(x) (((x) >> 24) & 0xff)
> +
> +#define AMD_CPPC_MAX_PERF(x) (((x) & 0xff) << 0)
> +#define AMD_CPPC_MIN_PERF(x) (((x) & 0xff) << 8)
> +#define AMD_CPPC_DES_PERF(x) (((x) & 0xff) << 16)
> +#define AMD_CPPC_ENERGY_PERF_PREF(x) (((x) & 0xff) << 24)
> +
> /* Fam 17h MSRs */
> #define MSR_F17H_IRPERF 0xc00000e9
>
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