From mboxrd@z Thu Jan 1 00:00:00 1970 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 D8047C04A6A for ; Sat, 12 Aug 2023 06:02:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233392AbjHLGCn (ORCPT ); Sat, 12 Aug 2023 02:02:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54592 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229709AbjHLGCn (ORCPT ); Sat, 12 Aug 2023 02:02:43 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AA416127 for ; Fri, 11 Aug 2023 23:02:42 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 4806E64366 for ; Sat, 12 Aug 2023 06:02:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 51C1AC433C9; Sat, 12 Aug 2023 06:02:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1691820161; bh=lv2uKChWNGwh11BkK35edDREkdvZK/bssTV4O8VXXzs=; h=Subject:To:Cc:From:Date:From; b=UUAdNspMWTFnSLWNoRSHHz9u4nrhRtr5bwEfMoYHzUYR9AksbSQeSjQBAms7hqO3a QUt6vkG6nr3Ntq93XDAG9sVrB7khxU2gj04vsjY6Ks2ZRhjmmQHUp0q/cQGocn0rjK CxxPuA0BZfxgzm0wfzf1iFjOgh+Itfkpqe9AEprk= Subject: FAILED: patch "[PATCH] cpuidle: psci: Move enabling OSI mode after power domains" failed to apply to 6.1-stable tree To: quic_mkshah@quicinc.com, ulf.hansson@linaro.org Cc: From: Date: Sat, 12 Aug 2023 08:02:38 +0200 Message-ID: <2023081238-transform-anybody-0d1c@gregkh> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y git checkout FETCH_HEAD git cherry-pick -x 12acb348fa4528a4203edf1cce7a3be2c9af2279 # git commit -s git send-email --to '' --in-reply-to '2023081238-transform-anybody-0d1c@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^.. Possible dependencies: 12acb348fa45 ("cpuidle: psci: Move enabling OSI mode after power domains creation") 668057b07db0 ("cpuidle: psci: Extend information in log about OSI/PC mode") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 12acb348fa4528a4203edf1cce7a3be2c9af2279 Mon Sep 17 00:00:00 2001 From: Maulik Shah Date: Mon, 3 Jul 2023 14:25:54 +0530 Subject: [PATCH] cpuidle: psci: Move enabling OSI mode after power domains creation A switch from OSI to PC mode is only possible if all CPUs other than the calling one are OFF, either through a call to CPU_OFF or not yet booted. Currently OSI mode is enabled before power domains are created. In cases where CPUidle states are not using hierarchical CPU topology the bail out path tries to switch back to PC mode which gets denied by firmware since other CPUs are online at this point and creates inconsistent state as firmware is in OSI mode and Linux in PC mode. This change moves enabling OSI mode after power domains are created, this would makes sure that hierarchical CPU topology is used before switching firmware to OSI mode. Cc: stable@vger.kernel.org Fixes: 70c179b49870 ("cpuidle: psci: Allow PM domain to be initialized even if no OSI mode") Signed-off-by: Maulik Shah Reviewed-by: Ulf Hansson Signed-off-by: Ulf Hansson diff --git a/drivers/cpuidle/cpuidle-psci-domain.c b/drivers/cpuidle/cpuidle-psci-domain.c index c2d6d9c3c930..b88af1262f1a 100644 --- a/drivers/cpuidle/cpuidle-psci-domain.c +++ b/drivers/cpuidle/cpuidle-psci-domain.c @@ -120,20 +120,6 @@ static void psci_pd_remove(void) } } -static bool psci_pd_try_set_osi_mode(void) -{ - int ret; - - if (!psci_has_osi_support()) - return false; - - ret = psci_set_osi_mode(true); - if (ret) - return false; - - return true; -} - static void psci_cpuidle_domain_sync_state(struct device *dev) { /* @@ -152,15 +138,12 @@ static int psci_cpuidle_domain_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct device_node *node; - bool use_osi; + bool use_osi = psci_has_osi_support(); int ret = 0, pd_count = 0; if (!np) return -ENODEV; - /* If OSI mode is supported, let's try to enable it. */ - use_osi = psci_pd_try_set_osi_mode(); - /* * Parse child nodes for the "#power-domain-cells" property and * initialize a genpd/genpd-of-provider pair when it's found. @@ -170,33 +153,37 @@ static int psci_cpuidle_domain_probe(struct platform_device *pdev) continue; ret = psci_pd_init(node, use_osi); - if (ret) - goto put_node; + if (ret) { + of_node_put(node); + goto exit; + } pd_count++; } /* Bail out if not using the hierarchical CPU topology. */ if (!pd_count) - goto no_pd; + return 0; /* Link genpd masters/subdomains to model the CPU topology. */ ret = dt_idle_pd_init_topology(np); if (ret) goto remove_pd; + /* let's try to enable OSI. */ + ret = psci_set_osi_mode(use_osi); + if (ret) + goto remove_pd; + pr_info("Initialized CPU PM domain topology using %s mode\n", use_osi ? "OSI" : "PC"); return 0; -put_node: - of_node_put(node); remove_pd: + dt_idle_pd_remove_topology(np); psci_pd_remove(); +exit: pr_err("failed to create CPU PM domains ret=%d\n", ret); -no_pd: - if (use_osi) - psci_set_osi_mode(false); return ret; }