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Bring in intel_pstate regression fixes for BayTrail

This commit is contained in:
Josh Boyer 2014-06-20 21:05:53 -04:00
parent 8fc448b27e
commit b8c3c4aa15
4 changed files with 405 additions and 1 deletions
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133
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stable@vger.kernel.org, Dirk Brandewie <dirk.j.brandewie@intel.com>
Subject: [PATCH 1/3] intel_pstate: Fix setting VID
Date: Fri, 20 Jun 2014 07:27:58 -0700
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From: Dirk Brandewie <dirk.j.brandewie@intel.com>
Commit 21855ff5 intel_pstate: Set turbo VID for BayTrail introduced
setting the turbo VID which is required to prevent a machine check on
some Baytrail SKUs under heavy graphics based workloads. The
docmumentation update that brought the requirement to light also
changed the bit mask used for enumerating P state and VID values from
0x7f to 0x3f.
This change returns the mask value to 0x7f.
Tested with the Intel NUC DN2820FYK,
BIOS version FYBYT10H.86A.0034.2014.0513.1413 with v3.16-rc1 and
v3.14.8 kernel versions.
Reported-by: Rune Reterson <rune@megahurts.dk>
Reported-by: Eric Eickmeyer <erich@ericheickmeyer.com>
Tested-by: Rune Reterson <rune@megahurts.dk>
Tested-by: Eric Eickmeyer <erich@ericheickmeyer.com>
References: https://bugzilla.kernel.org/show_bug.cgi?id=77951
Cc: Cc: Stable <stable@vger.kernel.org> [3.13+]
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
---
drivers/cpufreq/intel_pstate.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 924bb2d..74376d6 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -357,21 +357,21 @@ static int byt_get_min_pstate(void)
{
u64 value;
rdmsrl(BYT_RATIOS, value);
- return (value >> 8) & 0x3F;
+ return (value >> 8) & 0x7F;
}
static int byt_get_max_pstate(void)
{
u64 value;
rdmsrl(BYT_RATIOS, value);
- return (value >> 16) & 0x3F;
+ return (value >> 16) & 0x7F;
}
static int byt_get_turbo_pstate(void)
{
u64 value;
rdmsrl(BYT_TURBO_RATIOS, value);
- return value & 0x3F;
+ return value & 0x7F;
}
static void byt_set_pstate(struct cpudata *cpudata, int pstate)
@@ -405,8 +405,8 @@ static void byt_get_vid(struct cpudata *cpudata)
rdmsrl(BYT_VIDS, value);
- cpudata->vid.min = int_tofp((value >> 8) & 0x3f);
- cpudata->vid.max = int_tofp((value >> 16) & 0x3f);
+ cpudata->vid.min = int_tofp((value >> 8) & 0x7f);
+ cpudata->vid.max = int_tofp((value >> 16) & 0x7f);
cpudata->vid.ratio = div_fp(
cpudata->vid.max - cpudata->vid.min,
int_tofp(cpudata->pstate.max_pstate -
--
1.9.0
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97
intel_pstate-Update-documentation-of-max-min_perf_pct-sysfs-files.patch Normal file
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Subject: [PATCH 3/3] intel_pstate: Update documentation of {max,min}_perf_pct sysfs files
Date: Fri, 20 Jun 2014 07:28:00 -0700
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Update documentation to make the interpretation of the values clearer
References: https://bugzilla.kernel.org/show_bug.cgi?id=64251
Cc: Stable <stable@vger.kernel.org> [3.13+]
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
---
Documentation/cpu-freq/intel-pstate.txt | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/Documentation/cpu-freq/intel-pstate.txt b/Documentation/cpu-freq/intel-pstate.txt
index e742d21..a69ffe1 100644
--- a/Documentation/cpu-freq/intel-pstate.txt
+++ b/Documentation/cpu-freq/intel-pstate.txt
@@ -15,10 +15,13 @@ New sysfs files for controlling P state selection have been added to
/sys/devices/system/cpu/intel_pstate/
max_perf_pct: limits the maximum P state that will be requested by
- the driver stated as a percentage of the available performance.
+ the driver stated as a percentage of the available performance. The
+ available (P states) performance may be reduced by the no_turbo
+ setting described below.
min_perf_pct: limits the minimum P state that will be requested by
- the driver stated as a percentage of the available performance.
+ the driver stated as a percentage of the max (non-turbo)
+ performance level.
no_turbo: limits the driver to selecting P states below the turbo
frequency range.
--
1.9.0
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163
intel_pstate-dont-touch-turbo-bit-if-turbo-disabled-or-unavailable.patch Normal file
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Subject: [PATCH 2/3] intel_pstate: don't touch turbo bit if turbo disabled or unavailable.
Date: Fri, 20 Jun 2014 07:27:59 -0700
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From: Dirk Brandewie <dirk.j.brandewie@intel.com>
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.
References: https://bugzilla.kernel.org/show_bug.cgi?id=64251
Cc: Stable <stable@vger.kernel.org> [3.13+]
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
---
drivers/cpufreq/intel_pstate.c | 22 ++++++++++++++++------
1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 74376d6..127ead8 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -128,6 +128,7 @@ 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;
@@ -287,7 +288,10 @@ static ssize_t store_no_turbo(struct kobject *a, struct attribute *b,
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;
}
@@ -381,7 +385,7 @@ static void byt_set_pstate(struct cpudata *cpudata, int pstate)
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(
@@ -448,7 +452,7 @@ static void core_set_pstate(struct cpudata *cpudata, int pstate)
u64 val;
val = pstate << 8;
- if (limits.no_turbo)
+ if (limits.no_turbo && !limits.turbo_disabled)
val |= (u64)1 << 32;
wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val);
@@ -741,7 +745,7 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy)
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;
@@ -784,6 +788,7 @@ static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
{
struct cpudata *cpu;
int rc;
+ u64 misc_en;
rc = intel_pstate_init_cpu(policy->cpu);
if (rc)
@@ -791,8 +796,13 @@ static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
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;
--
1.9.0
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13
kernel.spec
View File

@ -62,7 +62,7 @@ Summary: The Linux kernel
# For non-released -rc kernels, this will be appended after the rcX and
# gitX tags, so a 3 here would become part of release "0.rcX.gitX.3"
#
%global baserelease 2
%global baserelease 3
%global fedora_build %{baserelease}
# base_sublevel is the kernel version we're starting with and patching
@ -734,6 +734,10 @@ Patch25100: dm-thin-update-discard_granularity-to-reflect-the-thin-pool-blocksiz
#rhbz 1103528
Patch25101: elantech-Deal-with-clickpads-reporting-right-button-.patch
Patch25102: intel_pstate-Fix-setting-VID.patch
Patch25103: intel_pstate-dont-touch-turbo-bit-if-turbo-disabled-or-unavailable.patch
Patch25104: intel_pstate-Update-documentation-of-max-min_perf_pct-sysfs-files.patch
# END OF PATCH DEFINITIONS
%endif
@ -1436,6 +1440,10 @@ ApplyPatch dm-thin-update-discard_granularity-to-reflect-the-thin-pool-blocksize
#rhbz 1103528
ApplyPatch elantech-Deal-with-clickpads-reporting-right-button-.patch
ApplyPatch intel_pstate-Fix-setting-VID.patch
ApplyPatch intel_pstate-dont-touch-turbo-bit-if-turbo-disabled-or-unavailable.patch
ApplyPatch intel_pstate-Update-documentation-of-max-min_perf_pct-sysfs-files.patch
# END OF PATCH APPLICATIONS
%endif
@ -2248,6 +2256,9 @@ fi
# ||----w |
# || ||
%changelog
* Fri Jun 20 2014 Josh Boyer <jwboyer@fedoraproject.org>
- Bring in intel_pstate regression fixes for BayTrail
* Tue Jun 17 2014 Josh Boyer <jwboyer@fedoraproject.org>
- Linux v3.15.1