From aed48c48fa65abdd584e14f7d0273711bc10d223 Mon Sep 17 00:00:00 2001 From: Patryk Wlazlyn Date: Tue, 30 Jan 2024 23:57:07 +0100 Subject: tools/power turbostat: add early exits for permission checks Checking early if the permissions are even needed gets rid of the warnings about some of them missing. Earlier we issued a warning in case of missing MSR and/or perf permissions, even when user never asked for counters that require those. Signed-off-by: Patryk Wlazlyn Signed-off-by: Len Brown --- tools/power/x86/turbostat/turbostat.c | 66 ++++++++++++++++++++++++++++++++--- 1 file changed, 61 insertions(+), 5 deletions(-) (limited to 'tools/power') diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c index 30db6e92193a..e5e01b58992e 100644 --- a/tools/power/x86/turbostat/turbostat.c +++ b/tools/power/x86/turbostat/turbostat.c @@ -5818,6 +5818,14 @@ static int has_instr_count_access(void) return has_access; } +bool is_aperf_access_required(void) +{ + return BIC_IS_ENABLED(BIC_Avg_MHz) + || BIC_IS_ENABLED(BIC_Busy) + || BIC_IS_ENABLED(BIC_Bzy_MHz) + || BIC_IS_ENABLED(BIC_IPC); +} + /* * Linux-perf manages the HW instructions-retired counter * by enabling when requested, and hiding rollover @@ -5833,8 +5841,7 @@ void linux_perf_init(void) err(-1, "calloc fd_instr_count_percpu"); } - const bool aperf_required = BIC_IS_ENABLED(BIC_Avg_MHz) || BIC_IS_ENABLED(BIC_Busy) || - BIC_IS_ENABLED(BIC_Bzy_MHz) || BIC_IS_ENABLED(BIC_IPC); + const bool aperf_required = is_aperf_access_required(); if (aperf_required && has_aperf && amperf_source == AMPERF_SOURCE_PERF) { fd_amperf_percpu = calloc(topo.max_cpu_num + 1, sizeof(*fd_amperf_percpu)); if (fd_amperf_percpu == NULL) @@ -5903,6 +5910,9 @@ static int has_amperf_access_via_perf(void) /* Check if we can access APERF and MPERF */ static int has_amperf_access(void) { + if (!is_aperf_access_required()) + return 0; + if (!no_msr && has_amperf_access_via_msr()) return 1; @@ -6581,7 +6591,8 @@ static void set_amperf_source(void) { amperf_source = AMPERF_SOURCE_PERF; - if (no_perf || !has_amperf_access_via_perf()) + const bool aperf_required = is_aperf_access_required(); + if (no_perf || !aperf_required || !has_amperf_access_via_perf()) amperf_source = AMPERF_SOURCE_MSR; if (quiet || !debug) @@ -6590,8 +6601,51 @@ static void set_amperf_source(void) fprintf(outf, "aperf/mperf source preference: %s\n", amperf_source == AMPERF_SOURCE_MSR ? "msr" : "perf"); } +bool is_msr_access_required(void) +{ + /* TODO: add detection for dynamic counters from add_counter() */ + if (no_msr) + return false; + + return BIC_IS_ENABLED(BIC_SMI) + || BIC_IS_ENABLED(BIC_CPU_c1) + || BIC_IS_ENABLED(BIC_CPU_c3) + || BIC_IS_ENABLED(BIC_CPU_c6) + || BIC_IS_ENABLED(BIC_CPU_c7) + || BIC_IS_ENABLED(BIC_Mod_c6) + || BIC_IS_ENABLED(BIC_CoreTmp) + || BIC_IS_ENABLED(BIC_Totl_c0) + || BIC_IS_ENABLED(BIC_Any_c0) + || BIC_IS_ENABLED(BIC_GFX_c0) + || BIC_IS_ENABLED(BIC_CPUGFX) + || BIC_IS_ENABLED(BIC_Pkgpc3) + || BIC_IS_ENABLED(BIC_Pkgpc6) + || BIC_IS_ENABLED(BIC_Pkgpc2) + || BIC_IS_ENABLED(BIC_Pkgpc7) + || BIC_IS_ENABLED(BIC_Pkgpc8) + || BIC_IS_ENABLED(BIC_Pkgpc9) + || BIC_IS_ENABLED(BIC_Pkgpc10) + || BIC_IS_ENABLED(BIC_CorWatt) + || BIC_IS_ENABLED(BIC_Cor_J) + || BIC_IS_ENABLED(BIC_PkgWatt) + || BIC_IS_ENABLED(BIC_CorWatt) + || BIC_IS_ENABLED(BIC_GFXWatt) + || BIC_IS_ENABLED(BIC_RAMWatt) + || BIC_IS_ENABLED(BIC_Pkg_J) + || BIC_IS_ENABLED(BIC_Cor_J) + || BIC_IS_ENABLED(BIC_GFX_J) + || BIC_IS_ENABLED(BIC_RAM_J) + || BIC_IS_ENABLED(BIC_PKG__) + || BIC_IS_ENABLED(BIC_RAM__) + || BIC_IS_ENABLED(BIC_PkgTmp) + || (is_aperf_access_required() && !has_amperf_access_via_perf()); +} + void check_msr_access(void) { + if (!is_msr_access_required()) + no_msr = 1; + check_dev_msr(); check_msr_permission(); @@ -6601,10 +6655,12 @@ void check_msr_access(void) void check_perf_access(void) { - if (no_perf || !has_instr_count_access()) + const bool intrcount_required = BIC_IS_ENABLED(BIC_IPC); + if (no_perf || !intrcount_required || !has_instr_count_access()) bic_enabled &= ~BIC_IPC; - if (!has_amperf_access()) { + const bool aperf_required = is_aperf_access_required(); + if (!aperf_required || !has_amperf_access()) { bic_enabled &= ~BIC_Avg_MHz; bic_enabled &= ~BIC_Busy; bic_enabled &= ~BIC_Bzy_MHz; -- cgit v1.2.3