This is a note to let you know that I've just added the patch titled
intel_pstate: don't touch turbo bit if turbo disabled or unavailable.
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
intel_pstate-don-t-touch-turbo-bit-if-turbo-disabled-or-unavailable.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From dd5fbf70f96dbfd7ee432096a1f979b2b3267856 Mon Sep 17 00:00:00 2001
From: Dirk Brandewie <dirk.j.brandewie@xxxxxxxxx>
Date: Fri, 20 Jun 2014 07:27:59 -0700
Subject: intel_pstate: don't touch turbo bit if turbo disabled or unavailable.
From: Dirk Brandewie <dirk.j.brandewie@xxxxxxxxx>
commit dd5fbf70f96dbfd7ee432096a1f979b2b3267856 upstream.
If turbo is disabled in the BIOS bit 38 should be set in
MSR_IA32_MISC_ENABLE register per section 14.3.2.1 of the SDM Vol 3
document 325384-050US Feb 2014. If this bit is set do *not* attempt
to disable trubo via the MSR_IA32_PERF_CTL register. On some systems
trying to disable turbo via MSR_IA32_PERF_CTL will cause subsequent
writes to MSR_IA32_PERF_CTL not take affect, in fact reading
MSR_IA32_PERF_CTL will not show the IDA/Turbo DISENGAGE bit(32) as
set. A write of bit 32 to zero returns to normal operation.
Also deal with the case where the processor does not support
turbo and the BIOS does not report the fact in MSR_IA32_MISC_ENABLE
but does report the max and turbo P states as the same value.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=64251
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@xxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/cpufreq/intel_pstate.c | 22 ++++++++++++++++------
1 file changed, 16 insertions(+), 6 deletions(-)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -132,6 +132,7 @@ static struct pstate_funcs pstate_funcs;
struct perf_limits {
int no_turbo;
+ int turbo_disabled;
int max_perf_pct;
int min_perf_pct;
int32_t max_perf;
@@ -291,7 +292,10 @@ static ssize_t store_no_turbo(struct kob
if (ret != 1)
return -EINVAL;
limits.no_turbo = clamp_t(int, input, 0 , 1);
-
+ if (limits.turbo_disabled) {
+ pr_warn("Turbo disabled by BIOS or unavailable on processor\n");
+ limits.no_turbo = limits.turbo_disabled;
+ }
return count;
}
@@ -385,7 +389,7 @@ static void byt_set_pstate(struct cpudat
u32 vid;
val = pstate << 8;
- if (limits.no_turbo)
+ if (limits.no_turbo && !limits.turbo_disabled)
val |= (u64)1 << 32;
vid_fp = cpudata->vid.min + mul_fp(
@@ -452,7 +456,7 @@ static void core_set_pstate(struct cpuda
u64 val;
val = pstate << 8;
- if (limits.no_turbo)
+ if (limits.no_turbo && !limits.turbo_disabled)
val |= (u64)1 << 32;
wrmsrl(MSR_IA32_PERF_CTL, val);
@@ -750,7 +754,7 @@ static int intel_pstate_set_policy(struc
limits.min_perf = int_tofp(1);
limits.max_perf_pct = 100;
limits.max_perf = int_tofp(1);
- limits.no_turbo = 0;
+ limits.no_turbo = limits.turbo_disabled;
return 0;
}
limits.min_perf_pct = (policy->min * 100) / policy->cpuinfo.max_freq;
@@ -790,6 +794,7 @@ static int intel_pstate_cpu_init(struct
{
struct cpudata *cpu;
int rc;
+ u64 misc_en;
rc = intel_pstate_init_cpu(policy->cpu);
if (rc)
@@ -797,8 +802,13 @@ static int intel_pstate_cpu_init(struct
cpu = all_cpu_data[policy->cpu];
- if (!limits.no_turbo &&
- limits.min_perf_pct == 100 && limits.max_perf_pct == 100)
+ rdmsrl(MSR_IA32_MISC_ENABLE, misc_en);
+ if (misc_en & MSR_IA32_MISC_ENABLE_TURBO_DISABLE ||
+ cpu->pstate.max_pstate == cpu->pstate.turbo_pstate) {
+ limits.turbo_disabled = 1;
+ limits.no_turbo = 1;
+ }
+ if (limits.min_perf_pct == 100 && limits.max_perf_pct == 100)
policy->policy = CPUFREQ_POLICY_PERFORMANCE;
else
policy->policy = CPUFREQ_POLICY_POWERSAVE;
Patches currently in stable-queue which might be from dirk.j.brandewie@xxxxxxxxx are
queue-3.14/intel_pstate-fix-setting-vid.patch
queue-3.14/intel_pstate-update-documentation-of-max-min-_perf_pct-sysfs-files.patch
queue-3.14/intel_pstate-don-t-touch-turbo-bit-if-turbo-disabled-or-unavailable.patch
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