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| author | Jan Kiszka <jan.kiszka@siemens.com> | 2016-07-08 20:42:04 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-08-20 18:09:18 +0200 |
| commit | 695c69bf304d7874e0b918684818711f0d7830f9 (patch) | |
| tree | b5d89f7b0c64e7789db50392659a127560b7a77d /drivers/cpufreq | |
| parent | e990e8ba92c63136f7678a8bbd656af53318343b (diff) | |
| download | linux-stable-695c69bf304d7874e0b918684818711f0d7830f9.tar.gz linux-stable-695c69bf304d7874e0b918684818711f0d7830f9.tar.bz2 linux-stable-695c69bf304d7874e0b918684818711f0d7830f9.zip | |
intel_pstate: Fix MSR_CONFIG_TDP_x addressing in core_get_max_pstate()
commit 5fc8f707a2aa40c767c3a338738b9b6fcd151ac1 upstream.
If MSR_CONFIG_TDP_CONTROL is locked, we currently try to address some
MSR 0x80000648 or so. Mask out the relevant level bits 0 and 1.
Found while running over the Jailhouse hypervisor which became upset
about this strange MSR index.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index f53b02a6bc05..6e80e4298274 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -662,7 +662,7 @@ static int core_get_max_pstate(void) if (err) goto skip_tar; - tdp_msr = MSR_CONFIG_TDP_NOMINAL + tdp_ctrl; + tdp_msr = MSR_CONFIG_TDP_NOMINAL + (tdp_ctrl & 0x3); err = rdmsrl_safe(tdp_msr, &tdp_ratio); if (err) goto skip_tar; |