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| author | Artem Bityutskiy <artem.bityutskiy@linux.intel.com> | 2022-03-02 10:16:00 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-03-04 19:54:32 +0100 |
| commit | 3a9cf77b60dc9839b6674943bb7c9dcd524b6294 (patch) | |
| tree | 72b57b5e202ebf70230baceb1bde4ebe9facaee0 /drivers/idle/intel_idle.c | |
| parent | da0e58c038e60e7e65d30813ebdfe91687aa8a24 (diff) | |
| download | lwn-3a9cf77b60dc9839b6674943bb7c9dcd524b6294.tar.gz lwn-3a9cf77b60dc9839b6674943bb7c9dcd524b6294.zip | |
intel_idle: add core C6 optimization for SPR
Add a Sapphire Rapids Xeon C6 optimization, similar to what we have for Sky Lake
Xeon: if package C6 is disabled, adjust C6 exit latency and target residency to
match core C6 values, instead of using the default package C6 values.
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/idle/intel_idle.c')
| -rw-r--r-- | drivers/idle/intel_idle.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index b2688c326522..e385ddf15b32 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -1578,6 +1578,8 @@ static void __init skx_idle_state_table_update(void) */ static void __init spr_idle_state_table_update(void) { + unsigned long long msr; + /* Check if user prefers C1E over C1. */ if (preferred_states_mask & BIT(2)) { if (preferred_states_mask & BIT(1)) @@ -1591,6 +1593,19 @@ static void __init spr_idle_state_table_update(void) c1e_promotion_enable(); disable_promotion_to_c1e = false; } + + /* + * By default, the C6 state assumes the worst-case scenario of package + * C6. However, if PC6 is disabled, we update the numbers to match + * core C6. + */ + rdmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr); + + /* Limit value 2 and above allow for PC6. */ + if ((msr & 0x7) < 2) { + spr_cstates[2].exit_latency = 190; + spr_cstates[2].target_residency = 600; + } } static bool __init intel_idle_verify_cstate(unsigned int mwait_hint) |