[RFC/RFT] [PATCH v2 1/6] cpufreq: intel_pstate: Cache last HWP capability/request value

[Srinivas Pandruvada]

Store the HWP request value last set using MSR_HWP_REQUEST. This will
allow us to save cycles used for reading last HWP request value for
dynamic update of MSR_HWP_REQUEST.
Also store HWP capability MSR value in local memory, to avoid reading
MSR later for calculating limits for dynamic update of MSR_HWP_REQUEST.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruv...@linux.intel.com>
---
 drivers/cpufreq/intel_pstate.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 17e566afbb41..baed29c768e7 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -221,6 +221,8 @@ struct global_params {
  *                     preference/bias
  * @epp_saved:         Saved EPP/EPB during system suspend or CPU offline
  *                     operation
+ * @hwp_req_cached:    Cached value of the last HWP Request MSR
+ * @hwp_cap_cached:    Cached value of the last HWP Capabilities MSR
  *
  * This structure stores per CPU instance data for all CPUs.
  */
@@ -253,6 +255,8 @@ struct cpudata {
        s16 epp_policy;
        s16 epp_default;
        s16 epp_saved;
+       u64 hwp_req_cached;
+       u64 hwp_cap_cached;
 };
 
 static struct cpudata **all_cpu_data;
@@ -689,6 +693,7 @@ static void intel_pstate_get_hwp_max(unsigned int cpu, int 
*phy_max,
        u64 cap;
 
        rdmsrl_on_cpu(cpu, MSR_HWP_CAPABILITIES, &cap);
+       WRITE_ONCE(all_cpu_data[cpu]->hwp_cap_cached, cap);
        if (global.no_turbo)
                *current_max = HWP_GUARANTEED_PERF(cap);
        else
@@ -763,6 +768,7 @@ static void intel_pstate_hwp_set(unsigned int cpu)
                intel_pstate_set_epb(cpu, epp);
        }
 skip_epp:
+       WRITE_ONCE(cpu_data->hwp_req_cached, value);
        wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value);
 }
 
-- 
2.13.6