linux-kernel - [PATCH] cpufreq: intel_pstate: Add Ice Lake server to out-of-band IDs

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Date:   Fri, 12 Nov 2021 09:16:57 +0000
From:   Adamos Ttofari <attofari@...zon.de>
To:     <attofari@...zon.de>
CC:     Hendrik Borghorst <hborghor@...zon.de>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Len Brown <lenb@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Giovanni Gherdovich <ggherdovich@...e.cz>,
        <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] cpufreq: intel_pstate: Add Ice Lake server to out-of-band IDs

Commit fbdc21e9b038 ("cpufreq: intel_pstate: Add Icelake servers support in
no-HWP mode") enabled the use of Intel P-State driver for Ice Lake servers.
But it doesn't cover the case when OS can't control P-States.

Therefore, for Ice Lake server, if MSR_MISC_PWR_MGMT bits 8 or 18 are
enabled, then the Intel P-State driver should exit as OS can't control
P-States.

Fixes: fbdc21e9b038 ("cpufreq: intel_pstate: Add Icelake servers support in no-HWP mode")

Signed-off-by: Adamos Ttofari <attofari@...zon.de>
Cc: Hendrik Borghorst <hborghor@...zon.de>
Cc: David Woodhouse <dwmw@...zon.co.uk>
---
 drivers/cpufreq/intel_pstate.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 815df3daae9d..1088ff350159 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -2353,6 +2353,7 @@ static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] __initconst = {
 	X86_MATCH(BROADWELL_D,		core_funcs),
 	X86_MATCH(BROADWELL_X,		core_funcs),
 	X86_MATCH(SKYLAKE_X,		core_funcs),
+	X86_MATCH(ICELAKE_X,		core_funcs),
 	{}
 };
 
-- 
2.32.0




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