5.4-stable review patch. If anyone has any objections, please let me know.
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From: Len Brown len.brown@intel.com
[ Upstream commit 2734fdbc9bb8a3aeb309ba0d62212d7f53f30bc7 ]
When we are successful in using cpufreq min/max limits, skip setting the raw MSR limits entirely.
This is necessary to avoid undoing any modification that the cpufreq driver makes to our sysfs request.
eg. intel_pstate may take our request for a limit that is valid according to HWP.CAP.MIN/MAX and clip it to be within the range available in PLATFORM_INFO.
Signed-off-by: Len Brown len.brown@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- .../x86_energy_perf_policy/x86_energy_perf_policy.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c b/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c index 0cb17e13c002b..c878e2e1cabea 100644 --- a/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c +++ b/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c @@ -62,6 +62,7 @@ unsigned char turbo_update_value; unsigned char update_hwp_epp; unsigned char update_hwp_min; unsigned char update_hwp_max; +unsigned char hwp_limits_done_via_sysfs; unsigned char update_hwp_desired; unsigned char update_hwp_window; unsigned char update_hwp_use_pkg; @@ -809,8 +810,10 @@ int ratio_2_sysfs_khz(int ratio) } /* * If HWP is enabled and cpufreq sysfs attribtes are present, - * then update sysfs, so that it will not become - * stale when we write to MSRs. + * then update via sysfs. The intel_pstate driver may modify (clip) + * this request, say, when HWP_CAP is outside of PLATFORM_INFO limits, + * and the driver-chosen value takes precidence. + * * (intel_pstate's max_perf_pct and min_perf_pct will follow cpufreq, * so we don't have to touch that.) */ @@ -865,6 +868,8 @@ int update_sysfs(int cpu) if (update_hwp_max) update_cpufreq_scaling_freq(1, cpu, req_update.hwp_max);
+ hwp_limits_done_via_sysfs = 1; + return 0; }
@@ -943,10 +948,10 @@ int update_hwp_request(int cpu) if (debug) print_hwp_request(cpu, &req, "old: ");
- if (update_hwp_min) + if (update_hwp_min && !hwp_limits_done_via_sysfs) req.hwp_min = req_update.hwp_min;
- if (update_hwp_max) + if (update_hwp_max && !hwp_limits_done_via_sysfs) req.hwp_max = req_update.hwp_max;
if (update_hwp_desired)