From patchwork Mon Sep 18 17:21:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Oza Pawandeep X-Patchwork-Id: 13390175 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B9E8EC46CA1 for ; Mon, 18 Sep 2023 17:21:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229561AbjIRRV7 (ORCPT ); Mon, 18 Sep 2023 13:21:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47982 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229608AbjIRRV6 (ORCPT ); Mon, 18 Sep 2023 13:21:58 -0400 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A6D76FA; Mon, 18 Sep 2023 10:21:52 -0700 (PDT) Received: from pps.filterd (m0279864.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 38IEPn2i017417; Mon, 18 Sep 2023 17:21:43 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : mime-version : content-type : content-transfer-encoding; s=qcppdkim1; bh=cS+wpZ5V56K6I1xkmbCKM44QVguTfU3WjZmElYRFn1U=; b=kvtxfzLOp1GSqAV/VfcwV0c1voqGpNZziks9IPDwRwhdxuqSidzrlywqmYAq6m3yp2sX YITBS/aQbUuJBitskLKuZwAuOVc3DTSPFAHsbDWb9mKbgGZxI5DEkj4ZnL2CRL61fnJ+ dOftVK7Q+bupZJrNx5E8IFPbvKIHn/7ZdOF/T06yPX5ZOHv0bsfOx2dEG4Lv9nlGE9ag /xqQAomXQlIq/7ofqpB5rtAq2P/g30dANeGCsLSuT1kjjYg5eQ3jNn9u1pJb+2yMKH/t 6teuJQVZfDDPSJRoNaO73res34PXW0cazOBeTvCH1bxiPtPS4VSiHgAwGPp22eq74KbP Fw== Received: from nalasppmta04.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3t6pmq0pd5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 18 Sep 2023 17:21:43 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA04.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 38IHLgwO019030 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 18 Sep 2023 17:21:42 GMT Received: from localhost (10.49.16.6) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.36; Mon, 18 Sep 2023 10:21:42 -0700 From: Oza Pawandeep To: , , , , , , , CC: Oza Pawandeep Subject: [PATCH v8] cpuidle, ACPI: Evaluate LPI arch_flags for broadcast timer Date: Mon, 18 Sep 2023 10:21:40 -0700 Message-ID: <20230918172140.2825357-1-quic_poza@quicinc.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01b.na.qualcomm.com (10.47.209.197) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: c86pfDBfPTRVd9Mv1waKxsQghRSdD3LG X-Proofpoint-ORIG-GUID: c86pfDBfPTRVd9Mv1waKxsQghRSdD3LG X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-09-18_08,2023-09-18_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=40 malwarescore=0 spamscore=40 priorityscore=1501 impostorscore=0 mlxlogscore=18 mlxscore=40 phishscore=0 clxscore=1015 lowpriorityscore=0 adultscore=0 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2308100000 definitions=main-2309180153 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Arm® Functional Fixed Hardware Specification defines LPI states, which provide an architectural context loss flags field that can be used to describe the context that might be lost when an LPI state is entered. - Core context Lost - General purpose registers. - Floating point and SIMD registers. - System registers, include the System register based - generic timer for the core. - Debug register in the core power domain. - PMU registers in the core power domain. - Trace register in the core power domain. - Trace context loss - GICR - GICD Qualcomm's custom CPUs preserves the architectural state, including keeping the power domain for local timers active. when core is power gated, the local timers are sufficient to wake the core up without needing broadcast timer. The patch fixes the evaluation of cpuidle arch_flags, and moves only to broadcast timer if core context lost is defined in ACPI LPI. Fixes: a36a7fecfe607 ("Add support for Low Power Idle(LPI) states") Reviewed-by: Sudeep Holla Acked-by: Rafael J. Wysocki Signed-off-by: Oza Pawandeep --- Notes: Will/Catalin: Rafael has acked and he prefers to take it via arm64 tree diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h index 4d537d56eb84..269d21209723 100644 --- a/arch/arm64/include/asm/acpi.h +++ b/arch/arm64/include/asm/acpi.h @@ -9,6 +9,7 @@ #ifndef _ASM_ACPI_H #define _ASM_ACPI_H +#include #include #include #include @@ -44,6 +45,23 @@ #define ACPI_MADT_GICC_TRBE (offsetof(struct acpi_madt_generic_interrupt, \ trbe_interrupt) + sizeof(u16)) +/* + * Arm® Functional Fixed Hardware Specification Version 1.2. + * Table 2: Arm Architecture context loss flags + */ +#define CPUIDLE_CORE_CTXT BIT(0) /* Core context Lost */ + +static __always_inline void _arch_update_idle_state_flags(u32 arch_flags, + unsigned int *sflags) +{ + if (arch_flags & CPUIDLE_CORE_CTXT) + *sflags |= CPUIDLE_FLAG_TIMER_STOP; +} +#define arch_update_idle_state_flags _arch_update_idle_state_flags + +#define CPUIDLE_TRACE_CTXT BIT(1) /* Trace context loss */ +#define CPUIDLE_GICR_CTXT BIT(2) /* GICR */ +#define CPUIDLE_GICD_CTXT BIT(3) /* GICD */ /* Basic configuration for ACPI */ #ifdef CONFIG_ACPI diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index dc615ef6550a..5c1d13eecdd1 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -1217,8 +1217,7 @@ static int acpi_processor_setup_lpi_states(struct acpi_processor *pr) strscpy(state->desc, lpi->desc, CPUIDLE_DESC_LEN); state->exit_latency = lpi->wake_latency; state->target_residency = lpi->min_residency; - if (lpi->arch_flags) - state->flags |= CPUIDLE_FLAG_TIMER_STOP; + arch_update_idle_state_flags(lpi->arch_flags, &state->flags); if (i != 0 && lpi->entry_method == ACPI_CSTATE_FFH) state->flags |= CPUIDLE_FLAG_RCU_IDLE; state->enter = acpi_idle_lpi_enter; diff --git a/include/linux/acpi.h b/include/linux/acpi.h index a73246c3c35e..07a825c76bab 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -1480,6 +1480,12 @@ static inline int lpit_read_residency_count_address(u64 *address) } #endif +#ifdef CONFIG_ACPI_PROCESSOR_IDLE +#ifndef arch_update_idle_state_flags +#define arch_update_idle_state_flags(af, sf) do {} while (0) +#endif +#endif /* CONFIG_ACPI_PROCESSOR_IDLE */ + #ifdef CONFIG_ACPI_PPTT int acpi_pptt_cpu_is_thread(unsigned int cpu); int find_acpi_cpu_topology(unsigned int cpu, int level);