linux-kernel - [PATCH] tools/power/turbostat: Add Power Limit4 support

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Date:   Fri, 20 Aug 2021 17:42:43 +0530
From:   Sumeet Pawnikar <sumeet.r.pawnikar@...el.com>
To:     lenb@...nel.org, x86@...nel.org, tony.luck@...el.com,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     sumeet.r.pawnikar@...el.com
Subject: [PATCH] tools/power/turbostat: Add Power Limit4 support

Add Power Limit4 support.

Signed-off-by: Sumeet Pawnikar <sumeet.r.pawnikar@...el.com>
Acked-by: Zhang Rui <rui.zhang@...el.com>
---
We can see below output with this patch under turbostat.
On Alder Lake:
cpu0: MSR_VR_CURRENT_CONFIG: 0x000003f0
cpu0: PKG Limit #4: 126.000000 Watts (UNlocked)

On Tiger Lake:
cpu0: MSR_VR_CURRENT_CONFIG: 0x00000348
cpu0: PKG Limit #4: 105.000000 Watts (UNlocked)
---
 arch/x86/include/asm/msr-index.h      | 1 +
 tools/power/x86/turbostat/turbostat.c | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index a7c413432b33..336a811c8683 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -310,6 +310,7 @@
 
 /* Run Time Average Power Limiting (RAPL) Interface */
 
+#define MSR_VR_CURRENT_CONFIG	0x00000601
 #define MSR_RAPL_POWER_UNIT		0x00000606
 
 #define MSR_PKG_POWER_LIMIT		0x00000610
diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 47d3ba895d6d..4eb59f459830 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -4768,6 +4768,15 @@ int print_rapl(struct thread_data *t, struct core_data *c, struct pkg_data *p)
 			((msr >> 32) & 0x7FFF) * rapl_power_units,
 			(1.0 + (((msr >> 54) & 0x3) / 4.0)) * (1 << ((msr >> 49) & 0x1F)) * rapl_time_units,
 			((msr >> 48) & 1) ? "EN" : "DIS");
+
+		if (get_msr(cpu, MSR_VR_CURRENT_CONFIG, &msr))
+			return -9;
+
+		fprintf(outf, "cpu%d: MSR_VR_CURRENT_CONFIG: 0x%08llx\n", cpu, msr);
+		fprintf(outf, "cpu%d: PKG Limit #4: %f Watts (%slocked)\n",
+			cpu,
+			((msr >> 0) & 0x1FFF) * rapl_power_units,
+			(msr >> 31) & 1 ? "" : "UN");
 	}
 
 	if (do_rapl & RAPL_DRAM_POWER_INFO) {
-- 
2.17.1