[linux-6.6.y] Add MWAIT Cx support for Zhaoxin CPUs

[leoliu-oc]

zhaoxin inclusion
category: bugfix
CVE: NA

---

When the processor is idle，low-power idle states (C-states) can be used to save power. For Zhaoxin processors，there are two methods to enter idle states. One is HLT instruction and legacy method of I/O reads from the ACPI-defined register (known as P_LVLx)，the other one is MWAIT instruction with idle states hints.

Default for legacy operating system，HLT and P_LVLx I/O reads are used for Zhaoxin Processors to enter idle states, but we have checked on some Zhaoxin platform that MWAIT instruction is more efficient than P_LVLx I/O reads and HLT, so we add MWAIT Cx support for Zhaoxin Processors.

[deepin-ci-robot]

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[deepin-ci-robot]

Hi @leoliu-oc. Thanks for your PR.

I'm waiting for a deepin-community member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[opsiff]

/ok-to-test

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在arch_has_acpi_pdc函数中，新增的条件判断可能会导致逻辑错误，如果c->x86_vendor等于X86_VENDOR_CENTAUR或X86_VENDOR_ZHAOXIN时，应该直接返回true，而不是进行额外的条件判断。
• 在ffh_cstate_init函数中，新增的条件判断c->x86_vendor != X86_VENDOR_CENTAUR && c->x86_vendor != X86_VENDOR_ZHAOXIN可能会导致原有的逻辑判断失效，需要确认新增的条件是否与原有逻辑一致。

是否建议立即修改:

• 是

[opsiff]

/lgtm