From patchwork Wed Feb 28 07:28:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: He Rongguang X-Patchwork-Id: 13574946 Received: from out30-118.freemail.mail.aliyun.com (out30-118.freemail.mail.aliyun.com [115.124.30.118]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 53BC225561; Wed, 28 Feb 2024 07:28:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.118 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709105297; cv=none; b=q6JVCIR7qj773YwmO9mWeSu9ls3lac20usTmlTEn73dkiYWWU7+NtQqVtKtUBYSiQAFr8HnYNjQoKxyc2tmsjj2dOoKIhpj0PjY/xwhKflo6WWitEq5r8KVWCJg3rH9JXa4YUOR2isHMPz8UnEbh6tKdbAK1/nHGtAmEcZRnFdE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709105297; c=relaxed/simple; bh=ePqKn8ziKMdqjuoJwILjLschlxQ28phSyMpacK99zsk=; h=Message-ID:Date:MIME-Version:To:From:Subject:Cc:Content-Type; b=R+zoNofABUkg5ffcbXiBff9AOgjUMGO+vBY0nfpoB4aUgck//GYNY2lguJc4Vdj42+dobGaZSGa9qjatKUhSV7IFo/rKNc4phP0JPZvjCK/mN1BM5y4nK/A+fuiSGoVtvbnS4UxVj4IAM5PxzTo/iakyAmDMu0ycwdHzsv3IFF4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=QuQdgyyD; arc=none smtp.client-ip=115.124.30.118 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="QuQdgyyD" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1709105292; h=Message-ID:Date:MIME-Version:To:From:Subject:Content-Type; bh=tTdDg6Bgbx6mgt0LyKK65ZbQOISSRCoKbVfK76KQnng=; b=QuQdgyyDa1UTktdRQa8IjR1u0ZntwQSgWDKijq2KIMWJDwvzLnapzrsN+eWQ0qJjezn8J4awpaVKTor/8I1jURk5PS8OXpWp9CKJqBT0Ht+joddCbXZb2muZbfThDPEyLa/CkyuZGgeYmWEd4dmO2+WYalycC3vaIfgeQstVzdo= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R101e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045168;MF=herongguang@linux.alibaba.com;NM=1;PH=DS;RN=7;SR=0;TI=SMTPD_---0W1P1iM4_1709105290; Received: from 30.221.96.233(mailfrom:herongguang@linux.alibaba.com fp:SMTPD_---0W1P1iM4_1709105290) by smtp.aliyun-inc.com; Wed, 28 Feb 2024 15:28:11 +0800 Message-ID: <64137e23-e374-4129-8e3c-dcd7606364d4@linux.alibaba.com> Date: Wed, 28 Feb 2024 15:28:08 +0800 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: jacob.jun.pan@linux.intel.com, lenb@kernel.org, rafael@kernel.org From: He Rongguang Subject: [PATCH] x86/cstate: fix mwait hint target cstate calc Cc: linux-pm@vger.kernel.org, linux-acpi@vger.kernel.org, herongguang@linux.alibaba.com, shannon.zhao@linux.alibaba.com According to x86 manual (Intel SDM Vol 2, Table 4-11. MWAIT Hints Register (EAX) and AMD manual Vol 3, MWAIT), mwait hint[7:4] adds 1 is the corresponding cstate, and 0xF means C0, so fix the handling of 0xF -> C0. Intel: "Value of 0 means C1; 1 means C2 and so on Value of 01111B means C0". AMD: "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 --- arch/x86/kernel/acpi/cstate.c | 4 ++-- drivers/idle/intel_idle.c | 3 ++- 2 files changed, 4 insertions(+), 3 deletions(-) -- 2.43.0 diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c index 401808b47af3..f3ffd0a3a012 100644 --- a/arch/x86/kernel/acpi/cstate.c +++ b/arch/x86/kernel/acpi/cstate.c @@ -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; diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index bcf1198e8991..e486027f8b07 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -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;