From owner-freebsd-hackers@freebsd.org Thu May 3 11:58:03 2018 Return-Path: Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 8EFCFFA824E for ; Thu, 3 May 2018 11:58:03 +0000 (UTC) (envelope-from agapon@gmail.com) Received: from mail-lf0-f46.google.com (mail-lf0-f46.google.com [209.85.215.46]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id E92FB6864C; Thu, 3 May 2018 11:58:02 +0000 (UTC) (envelope-from agapon@gmail.com) Received: by mail-lf0-f46.google.com with SMTP id y72-v6so11808307lfd.2; Thu, 03 May 2018 04:58:02 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:references:openpgp:autocrypt :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=w0/KHc+HDWZGAzWfs4WUE7EncYMUtxwWlNreUr7mgBY=; b=MjVcN1qRWxb5+Y8MfhJZanykcMDvF3HAF/mpXgBG0q20kl63DtEdxvqgtoxyviF0IM 1K767EjTfZ4mbFgzI+y8RPMP9X87q2E263YXtKpIZ/5zLPa8kBC3Y3X3fPYCm+JxPRIf ifpTD2u0/qpfTVNNSsPrLA9xk2EjABgMeEpTqI2xTMbKiTHzeusPZrMPAksinnqx7ThG r6907ZAI16Vc2XiutO5KIlKvJxUJYyVKniPnPXO0Apzd5hZ6DKAl88vUdNjSLvGZYOtV UlLtTbI0FG3Jjx0iBqbudA8/s8B4IG/Nx0TIyHstHZ/trnKHqhfkcajdhQoiKJMuAn9T /u6w== X-Gm-Message-State: ALQs6tBZu5JfWuGQ4fexfB4lUXnqIIeDHlyMoNqELrHMHSe/O08zYYHX wZNWe/Ea7UwXp6S1iA39uS3wIOjh X-Google-Smtp-Source: AB8JxZq8jNcI+vWYh0N2J/E8Fwk9gaGft4bCy7h2DhXEGxYaP+oOLs5rKD37joSF9rfvDLVc0AZAqQ== X-Received: by 2002:a19:5a1d:: with SMTP id o29-v6mr13983491lfb.93.1525348681160; Thu, 03 May 2018 04:58:01 -0700 (PDT) Received: from [192.168.0.88] (east.meadow.volia.net. [93.72.151.96]) by smtp.googlemail.com with ESMTPSA id o11-v6sm2807951ljc.77.2018.05.03.04.58.00 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 03 May 2018 04:58:00 -0700 (PDT) Subject: Re: hpet vs suspend to ram From: Andriy Gapon To: Konstantin Belousov Cc: "freebsd-hackers@freebsd.org" References: <8d3f5a6f-f2be-f2e1-18d5-f774f4909694@icyb.net.ua> <20180503095558.GJ6887@kib.kiev.ua> <18935a5e-cd60-a434-f226-1c4ab258c044@FreeBSD.org> Openpgp: preference=signencrypt Autocrypt: addr=avg@FreeBSD.org; prefer-encrypt=mutual; keydata= xsFNBFm4LIgBEADNB/3lT7f15UKeQ52xCFQx/GqHkSxEdVyLFZTmY3KyNPQGBtyvVyBfprJ7 mAeXZWfhat6cKNRAGZcL5EmewdQuUfQfBdYmKjbw3a9GFDsDNuhDA2QwFt8BmkiVMRYyvI7l N0eVzszWCUgdc3qqM6qqcgBaqsVmJluwpvwp4ZBXmch5BgDDDb1MPO8AZ2QZfIQmplkj8Y6Z AiNMknkmgaekIINSJX8IzRzKD5WwMsin70psE8dpL/iBsA2cpJGzWMObVTtCxeDKlBCNqM1i gTXta1ukdUT7JgLEFZk9ceYQQMJJtUwzWu1UHfZn0Fs29HTqawfWPSZVbulbrnu5q55R4PlQ /xURkWQUTyDpqUvb4JK371zhepXiXDwrrpnyyZABm3SFLkk2bHlheeKU6Yql4pcmSVym1AS4 dV8y0oHAfdlSCF6tpOPf2+K9nW1CFA8b/tw4oJBTtfZ1kxXOMdyZU5fiG7xb1qDgpQKgHUX8 7Rd2T1UVLVeuhYlXNw2F+a2ucY+cMoqz3LtpksUiBppJhw099gEXehcN2JbUZ2TueJdt1FdS ztnZmsHUXLxrRBtGwqnFL7GSd6snpGIKuuL305iaOGODbb9c7ne1JqBbkw1wh8ci6vvwGlzx rexzimRaBzJxlkjNfMx8WpCvYebGMydNoeEtkWldtjTNVsUAtQARAQABzR5BbmRyaXkgR2Fw b24gPGF2Z0BGcmVlQlNELm9yZz7CwZQEEwEIAD4WIQS+LEO7ngQnXA4Bjr538m7TUc1yjwUC WbgsiAIbIwUJBaOagAULCQgHAgYVCAkKCwIEFgIDAQIeAQIXgAAKCRB38m7TUc1yj+JAEACV l9AK/nOWAt/9cufV2fRj0hdOqB1aCshtSrwHk/exXsDa4/FkmegxXQGY+3GWX3deIyesbVRL rYdtdK0dqJyT1SBqXK1h3/at9rxr9GQA6KWOxTjUFURsU7ok/6SIlm8uLRPNKO+yq0GDjgaO LzN+xykuBA0FlhQAXJnpZLcVfPJdWv7sSHGedL5ln8P8rxR+XnmsA5TUaaPcbhTB+mG+iKFj GghASDSfGqLWFPBlX/fpXikBDZ1gvOr8nyMY9nXhgfXpq3B6QCRYKPy58ChrZ5weeJZ29b7/ QdEO8NFNWHjSD9meiLdWQaqo9Y7uUxN3wySc/YUZxtS0bhAd8zJdNPsJYG8sXgKjeBQMVGuT eCAJFEYJqbwWvIXMfVWop4+O4xB+z2YE3jAbG/9tB/GSnQdVSj3G8MS80iLS58frnt+RSEw/ psahrfh0dh6SFHttE049xYiC+cM8J27Aaf0i9RflyITq57NuJm+AHJoU9SQUkIF0nc6lfA+o JRiyRlHZHKoRQkIg4aiKaZSWjQYRl5Txl0IZUP1dSWMX4s3XTMurC/pnja45dge/4ESOtJ9R 8XuIWg45Oq6MeIWdjKddGhRj3OohsltKgkEU3eLKYtB6qRTQypHHUawCXz88uYt5e3w4V16H lCpSTZV/EVHnNe45FVBlvK7k7HFfDDkryM7BTQRZuCyIARAAlq0slcsVboY/+IUJdcbEiJRW be9HKVz4SUchq0z9MZPX/0dcnvz/gkyYA+OuM78dNS7Mbby5dTvOqfpLJfCuhaNYOhlE0wY+ 1T6Tf1f4c/uA3U/YiadukQ3+6TJuYGAdRZD5EqYFIkreARTVWg87N9g0fT9BEqLw9lJtEGDY EWUE7L++B8o4uu3LQFEYxcrb4K/WKmgtmFcm77s0IKDrfcX4doV92QTIpLiRxcOmCC/OCYuO jB1oaaqXQzZrCutXRK0L5XN1Y1PYjIrEzHMIXmCDlLYnpFkK+itlXwlE2ZQxkfMruCWdQXye syl2fynAe8hvp7Mms9qU2r2K9EcJiR5N1t1C2/kTKNUhcRv7Yd/vwusK7BqJbhlng5ZgRx0m WxdntU/JLEntz3QBsBsWM9Y9wf2V4tLv6/DuDBta781RsCB/UrU2zNuOEkSixlUiHxw1dccI 6CVlaWkkJBxmHX22GdDFrcjvwMNIbbyfQLuBq6IOh8nvu9vuItup7qemDG3Ms6TVwA7BD3j+ 3fGprtyW8Fd/RR2bW2+LWkMrqHffAr6Y6V3h5kd2G9Q8ZWpEJk+LG6Mk3fhZhmCnHhDu6CwN MeUvxXDVO+fqc3JjFm5OxhmfVeJKrbCEUJyM8ESWLoNHLqjywdZga4Q7P12g8DUQ1mRxYg/L HgZY3zfKOqcAEQEAAcLBfAQYAQgAJhYhBL4sQ7ueBCdcDgGOvnfybtNRzXKPBQJZuCyIAhsM BQkFo5qAAAoJEHfybtNRzXKPBVwQAKfFy9P7N3OsLDMB56A4Kf+ZT+d5cIx0Yiaf4n6w7m3i ImHHHk9FIetI4Xe54a2IXh4Bq5UkAGY0667eIs+Z1Ea6I2i27Sdo7DxGwq09Qnm/Y65ADvXs 3aBvokCcm7FsM1wky395m8xUos1681oV5oxgqeRI8/76qy0hD9WR65UW+HQgZRIcIjSel9vR XDaD2HLGPTTGr7u4v00UeTMs6qvPsa2PJagogrKY8RXdFtXvweQFz78NbXhluwix2Tb9ETPk LIpDrtzV73CaE2aqBG/KrboXT2C67BgFtnk7T7Y7iKq4/XvEdDWscz2wws91BOXuMMd4c/c4 OmGW9m3RBLufFrOag1q5yUS9QbFfyqL6dftJP3Zq/xe+mr7sbWbhPVCQFrH3r26mpmy841ym dwQnNcsbIGiBASBSKksOvIDYKa2Wy8htPmWFTEOPRpFXdGQ27awcjjnB42nngyCK5ukZDHi6 w0qK5DNQQCkiweevCIC6wc3p67jl1EMFY5+z+zdTPb3h7LeVnGqW0qBQl99vVFgzLxchKcl0 R/paSFgwqXCZhAKMuUHncJuynDOP7z5LirUeFI8qsBAJi1rXpQoLJTVcW72swZ42IdPiboqx NbTMiNOiE36GqMcTPfKylCbF45JNX4nF9ElM0E+Y8gi4cizJYBRr2FBJgay0b9Cp Message-ID: <39dad33d-3983-c85f-5049-e3b934800829@FreeBSD.org> Date: Thu, 3 May 2018 14:57:59 +0300 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <18935a5e-cd60-a434-f226-1c4ab258c044@FreeBSD.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 03 May 2018 11:58:03 -0000 On 03/05/2018 14:50, Andriy Gapon wrote: > Thank you very much for the suggestion! > It seems that doing that (and a little bit more[*]) helps indeed. > > However there seems to be another issue. > hpet_suspend() is called too early. [Some] Other drivers require a working > event timer for their suspend routines. So after HPET is stopped the suspend > process gets stuck. Repeatedly pressing keyboard keys helps the process to > finally reach the firmware suspend. Everything is okay after resume. Got a patch for this issue as well. The idea is to suspend children in the reverse order (comparing to their attach order). --- a/sys/kern/subr_bus.c +++ b/sys/kern/subr_bus.c @@ -3772,15 +3772,16 @@ int bus_generic_suspend(device_t dev) { int error; - device_t child, child2; + device_t child; - TAILQ_FOREACH(child, &dev->children, link) { + TAILQ_FOREACH_REVERSE(child, &dev->children, device_list, link) { error = BUS_SUSPEND_CHILD(dev, child); - if (error) { - for (child2 = TAILQ_FIRST(&dev->children); - child2 && child2 != child; - child2 = TAILQ_NEXT(child2, link)) - BUS_RESUME_CHILD(dev, child2); + if (error != 0) { + child = TAILQ_NEXT(child, link); + if (child != NULL) { + TAILQ_FOREACH_FROM(child, &dev->children, link) + BUS_RESUME_CHILD(dev, child); + } return (error); } } -- Andriy Gapon