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cpuidle: ACPI/intel: fix MWAIT hint target C-state computation

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According to x86 spec ([1] and [2]), MWAIT hint_address[7:4] plus 1 is
the corresponding C-state, and 0xF means C0.

ACPI C-state table usually only contains C1+, but nothing prevents ACPI
firmware from presenting a C-state (maybe C1+) but using MWAIT address C0
(i.e., 0xF in ACPI FFH MWAIT hint address). And if this is the case, Linux
erroneously treat this cstate as C16, while actually this should be valid
C0 instead of C16, as per the specifications.

Since ACPI firmware is out of Linux kernel scope, fix the kernel handling
of 0xF ->(to) C0 in this situation. This is found when a tweaked ACPI
C-state table is presented by Qemu to VM.

Also modify the intel_idle case for code consistency.

[1]. Intel SDM Vol 2, Table 4-11. MWAIT Hints
Register (EAX): "Value of 0 means C1; 1 means C2 and so on
Value of 01111B means C0".

[2]. AMD manual Vol 3, MWAIT: "The processor C-state is EAX[7:4]+1, so to
request C0 is to place the value F in EAX[7:4] and to request C1 is to
place the value 0 in EAX[7:4].".

Signed-off-by: He Rongguang <herongguang@linux.alibaba.com>
[ rjw: Subject and changelog edits, whitespace fixups ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
He Rongguang 2024-03-04 14:14:06 +08:00 committed by Rafael J. Wysocki
parent 88390dd788
commit 6b8e288f49
2 changed files with 4 additions and 3 deletions
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4
arch/x86/kernel/acpi/cstate.c
View File

@ -131,8 +131,8 @@ static long acpi_processor_ffh_cstate_probe_cpu(void *_cx)
cpuid(CPUID_MWAIT_LEAF, &eax, &ebx, &ecx, &edx);
/* Check whether this particular cx_type (in CST) is supported or not */
cstate_type = ((cx->address >> MWAIT_SUBSTATE_SIZE) &
MWAIT_CSTATE_MASK) + 1;
cstate_type = (((cx->address >> MWAIT_SUBSTATE_SIZE) &
MWAIT_CSTATE_MASK) + 1) & MWAIT_CSTATE_MASK;
edx_part = edx >> (cstate_type * MWAIT_SUBSTATE_SIZE);
num_cstate_subtype = edx_part & MWAIT_SUBSTATE_MASK;

3
drivers/idle/intel_idle.c
View File

@ -1934,7 +1934,8 @@ static void __init spr_idle_state_table_update(void)
static bool __init intel_idle_verify_cstate(unsigned int mwait_hint)
{
unsigned int mwait_cstate = MWAIT_HINT2CSTATE(mwait_hint) + 1;
unsigned int mwait_cstate = (MWAIT_HINT2CSTATE(mwait_hint) + 1) &
MWAIT_CSTATE_MASK;
unsigned int num_substates = (mwait_substates >> mwait_cstate * 4) &
MWAIT_SUBSTATE_MASK;