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 EC06AC433FE for ; Tue, 1 Nov 2022 17:37:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230438AbiKARht (ORCPT ); Tue, 1 Nov 2022 13:37:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38424 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231180AbiKARhn (ORCPT ); Tue, 1 Nov 2022 13:37:43 -0400 Received: from mail-ed1-x534.google.com (mail-ed1-x534.google.com [IPv6:2a00:1450:4864:20::534]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 054691CB1C for ; Tue, 1 Nov 2022 10:37:41 -0700 (PDT) Received: by mail-ed1-x534.google.com with SMTP id u24so13567153edd.13 for ; Tue, 01 Nov 2022 10:37:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=cdUAsiAgmBJ1jbIAcY/gGR+Z/7ih0XBIpAP4mnSXYwg=; b=U+3jcriNI6G3mRzAxSj20osZtTDZErBW8Nh3ObL1xuyZVmynG7VTQ6hdaJDZfvYuc4 BsAvfNmsSOYVQr1aPoTaBNp/Wjsp/mcsuXhQVkBEvgszY1b+jniCkvoAvlnhfUO9/7Ew nYABzAW6uipYWW4pCOp3Jvxu/hanu2Vo9v1kg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=cdUAsiAgmBJ1jbIAcY/gGR+Z/7ih0XBIpAP4mnSXYwg=; b=ihddnHFpOzKB0xCG7L1HAKUMdBacRFgQGgb7Ad+GXp5rlqA3u2RIhDAQi4Ize6+mW1 UDcoIE/Ja1jBPoGk558REc5rIvWcDPKha2kqV/LcFtiR5J4lEnnW+ZKZybuiZZAvoiZJ d+yUpfH2aaMgR5VPF/ZCIA9S2/D7g1f7sy867whmERP0DY95F12zTRM5sf0iD3rD8QyX A0wAW+fPwUaRUOoy5hmS3kO0q+ygoaV2qaztqtIl4CgXN5Zyq9UnLkEkdqsKpGk9t7JQ m5rGASK5GBXV54dBEgP8eEsA0x7AbPwnu+RnxzGLUWCGyprkKw5pzAuDnGDcOkro6Jqe kuLw== X-Gm-Message-State: ACrzQf2bfDVoeYRkV0wFjaXMYfeny7mw5a/DdlxrS+dgWpFstJp+t/bz nUIW5FB4O2TBdBa5GWaitODWvyh3iHiCWPZ1 X-Google-Smtp-Source: AMsMyM5ebDvYyqKxpcAYm3F4xDirivj+cNvE9O24Ywokb2WFP+TtQBLf0e+ROZpZetJxMjGEcyVBmg== X-Received: by 2002:a50:eb05:0:b0:457:c6f5:5f65 with SMTP id y5-20020a50eb05000000b00457c6f55f65mr19762375edp.311.1667324259389; Tue, 01 Nov 2022 10:37:39 -0700 (PDT) Received: from mail-ed1-f46.google.com (mail-ed1-f46.google.com. [209.85.208.46]) by smtp.gmail.com with ESMTPSA id f10-20020a50fe0a000000b00443d657d8a4sm4655399edt.61.2022.11.01.10.37.37 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 01 Nov 2022 10:37:38 -0700 (PDT) Received: by mail-ed1-f46.google.com with SMTP id y69so22795695ede.5 for ; Tue, 01 Nov 2022 10:37:37 -0700 (PDT) X-Received: by 2002:a05:6402:1947:b0:461:a47d:274 with SMTP id f7-20020a056402194700b00461a47d0274mr20093632edz.165.1667324257158; Tue, 01 Nov 2022 10:37:37 -0700 (PDT) MIME-Version: 1.0 References: <20221031204320.22464-1-mario.limonciello@amd.com> <20221031204320.22464-2-mario.limonciello@amd.com> In-Reply-To: <20221031204320.22464-2-mario.limonciello@amd.com> From: Sven van Ashbrook Date: Tue, 1 Nov 2022 13:37:26 -0400 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [RFC 1/3] PM: Add a sysfs file to represent whether hardware reached the deepest state To: Mario Limonciello Cc: Rafael J Wysocki , Pavel Machek , Len Brown , Rajneesh Bhardwaj , S-k Shyam-sundar , rrangel@chromium.org, platform-driver-x86@vger.kernel.org, Rajat Jain , David E Box , Hans de Goede , linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Oct 31, 2022 at 4:43 PM Mario Limonciello wrote: > > +void pm_set_hw_deepest_state(u64 duration) > +{ > + suspend_stats.last_hw_deepest_state = duration; I'm wondering if we could add a userspace notification here. Then userspace wouldn't have to synchronize with the suspend/resume state of the system when reading this entry. What about sysfs_notify() ? Or via udev? > +} > +EXPORT_SYMBOL_GPL(pm_set_hw_deepest_state);