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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>
This commit is contained in:
Artem Bityutskiy 2022-03-02 10:16:00 +02:00 committed by Rafael J. Wysocki
parent da0e58c038
commit 3a9cf77b60
1 changed files with 15 additions and 0 deletions
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15
drivers/idle/intel_idle.c
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@ -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)