From mboxrd@z Thu Jan 1 00:00:00 1970 From: Harry Pan Subject: [PATCH v3] platform/x86: intel_pmc_core: transform Pkg C-state residency from TSC ticks into microseconds Date: Wed, 19 Jun 2019 16:28:01 +0800 Message-ID: <20190619082801.21699-1-harry.pan@intel.com> References: <20190528025727.6014-1-harry.pan@intel.com> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20190528025727.6014-1-harry.pan@intel.com> Sender: linux-kernel-owner@vger.kernel.org To: LKML Cc: gs0622@gmail.com, Harry Pan , Vishwanath Somayaji , Andy Shevchenko , platform-driver-x86@vger.kernel.org, Rajneesh Bhardwaj , Darren Hart List-Id: platform-driver-x86.vger.kernel.org Refer to the Intel SDM Vol.4, the package C-state residency counters of modern IA micro-architecture are all ticking in TSC frequency, hence we can apply simple math to transform the ticks into microseconds. i.e., residency (ms) = count / tsc_khz residency (us) = count / tsc_khz * 1000 This also aligns to other sysfs debug entries of residency counter in the same metric in microseconds, benefits reading and scripting. v2: restore the accidentally deleted newline, no function change. v3: apply kernel do_div() macro to calculate division Signed-off-by: Harry Pan --- drivers/platform/x86/intel_pmc_core.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c index f2c621b55f49..ab798efacc85 100644 --- a/drivers/platform/x86/intel_pmc_core.c +++ b/drivers/platform/x86/intel_pmc_core.c @@ -24,6 +24,7 @@ #include #include #include +#include #include "intel_pmc_core.h" @@ -738,7 +739,9 @@ static int pmc_core_pkgc_show(struct seq_file *s, void *unused) if (rdmsrl_safe(map[index].bit_mask, &pcstate_count)) continue; - seq_printf(s, "%-8s : 0x%llx\n", map[index].name, + pcstate_count *= 1000; + do_div(pcstate_count, tsc_khz); + seq_printf(s, "%-8s : %llu\n", map[index].name, pcstate_count); } -- 2.20.1