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[2620:137:e000::1:20]) by mx.google.com with ESMTP id dd9-20020a1709069b8900b0093defbd6275si14250365ejc.1020.2023.03.28.06.44.12; Tue, 28 Mar 2023 06:44:37 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20210112 header.b=PeN4PVlI; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233249AbjC1NiZ (ORCPT + 99 others); Tue, 28 Mar 2023 09:38:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37906 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232841AbjC1NiU (ORCPT ); Tue, 28 Mar 2023 09:38:20 -0400 Received: from mail-wr1-x433.google.com (mail-wr1-x433.google.com [IPv6:2a00:1450:4864:20::433]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 54FE8AD0E for ; Tue, 28 Mar 2023 06:38:17 -0700 (PDT) Received: by mail-wr1-x433.google.com with SMTP id l27so12264450wrb.2 for ; Tue, 28 Mar 2023 06:38:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; t=1680010696; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=LIezWcC42h0ES1RJtRzU0ZPy+jlW694/tWWre3nr04o=; b=PeN4PVlILs3/e87yebQgkoi0lUwsO4Q9UILT9CvI0j2iWrV4UyC0RYvhJBmZQ/jtF6 OO7ULx4R3rxBuPVhmbof/XRYGNWpjFBXvAm/dhGyh34u+Gy+GWqyDGot1zMrMQaMxw1h jiX8qVdJ8R0qEuCby7sto8oIH7bBS99Cr7pmXgBqt+ffJnW/eIgrBTUMTqaegEghtvXB Mh/+VofjeK6dtSuR6F1IuCG9Zi1vAzUzcCXAi/s4Cv+EZyRsGmrTEC/NoZ6GYrIr9IKz Zykd/KuoB8B/JwGXRfcB/gvtWqq0BKUr9F9vRWP5UbGd+gcM9FQAGsMybu8Tt1CCG4MS 1/dA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680010696; 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=LIezWcC42h0ES1RJtRzU0ZPy+jlW694/tWWre3nr04o=; b=VzEY/h3HrXB7XcVbUYGwXBQ16UXRn7Z4dkoeHE2AUWI46pb03R7pVbXXZoV4LZxVB4 yeHeDWAO35eR+cmVrcJrI5EIE1B9wxi0uLtXoPwhkaslLBk6gXvE9Q8UxlgzDZIp+pjF M3ML0tQkk+H93dBwlQGeksCnlKE1XDX3wXIITe6Xwv/o2lizz+4IQeirF3BMl/bZb13c +IJyEJYAADiO9d8l1bMn6jae91pwA8CfAswYmO3pgs4OsrNFjQsKGrsBtrzaD4qVMtPg Xq6Z+/IVgEvv4QCao0IxLSVtjoOc8d/mWmFs06NLSbIroyDO5W3MwzLwSITjVgveI0BZ /06A== X-Gm-Message-State: AAQBX9fwCNN6FkZeARXV88aAQOrKayrhMFiI0yFwb37ZO+0xPLnEhwFy nHdYis7bQj6szBfqYtoAAeJU/P/Ax4vWhUa0iAPHuA== X-Received: by 2002:adf:fb90:0:b0:2d6:9044:d836 with SMTP id a16-20020adffb90000000b002d69044d836mr2650840wrr.2.1680010695655; Tue, 28 Mar 2023 06:38:15 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: David Gow Date: Tue, 28 Mar 2023 21:38:03 +0800 Message-ID: Subject: Re: [PATCH v6 3/7] kunit: Add kunit wrappers for (root) device creation To: Matti Vaittinen Cc: Greg Kroah-Hartman , Matti Vaittinen , Brendan Higgins , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com, Stephen Boyd , Jonathan Cameron , linux-iio@vger.kernel.org, Maxime Ripard Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000c174b905f7f5f8e7" X-Spam-Status: No, score=-15.7 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,ENV_AND_HDR_SPF_MATCH, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL, USER_IN_DEF_SPF_WL autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --000000000000c174b905f7f5f8e7 Content-Type: text/plain; charset="UTF-8" On Tue, 28 Mar 2023 at 21:22, Matti Vaittinen wrote: > > Hi David & Greg and thanks for working with this! > > On 3/28/23 15:45, David Gow wrote: > > Thanks, Gred and Matti. > > > > On Mon, 27 Mar 2023 at 20:38, Greg Kroah-Hartman > > wrote: > >> > >> On Mon, Mar 27, 2023 at 03:20:06PM +0300, Matti Vaittinen wrote: > >>> On 3/27/23 15:01, Greg Kroah-Hartman wrote: > >>>> On Mon, Mar 27, 2023 at 02:34:02PM +0300, Matti Vaittinen wrote: > > > > I'm happy to keep working on this, but would definitely appreciate > > your feedback. > > > > I've put my work-in-progress code here: > > https://kunit.googlesource.com/linux/+/refs/heads/kunit/device-helpers%5E%21/#F0 > > > > It creates a "kunit" bus, and adds a few helpers to create both > > devices and drivers on that bus, and clean them up when the test > > exits. It seems to work on all of the tests which used > > root_device_register so far (except those -- only > > test_iio_find_closest_gain_low so far -- which create multiple devices > > with the same name, as the driver name won't be unique), > > I wouldn't worry about it for as long as it's just because an iio-gts > test does something silly. Those tests are currently only in my personal > playground and changing those tests should be pretty trivial. > Yeah: this isn't anything to worry about. It's as much my note as to "what works with this code as-is", rather than indicative of a more fundamental flaw. > And right after saying that - the test_iio_find_closest_gain_low test does > > a) register a 'test' device > b) perform test on devm_ API > c) unregister the 'test' device > > d) register a 'test' device (same name as at step a) > e) perform test on devm_ API > f) unregister the 'test' device > > My assumption is that the test device would be gone after step c) > because there should be no references to it anywhere. Hence, I wonder > why registering at step d) fails? (Or did I misunderstand something?) > This is because I'm now creating a struct device_driver as well as a device, and it's not being cleaned up until the end of the test. The two solutions here would be to either: - Add a way to clean up the driver earlier. (Shouldn't be too hard, I just haven't got around to it yet), or: - Use the same struct device_driver for both tests (there's a new kunit_device_register_with_driver which allows you to pass a custom driver in, rather than creating your own) I think the latter's probably better, but I'll probably implement both as I clean up the API further. > > and the drm > > tests work fine when ported to it as well. > > > > There's still a lot of cleanup to do and questions which need > > answering, including: > > - Working out how best to provide an owning module (it's currently > > just kunit, but probably should be the module which contains the > > actual tests) > > Maybe there is something I am not seeing but how about wrapping the > kunit_device_register() in a macro and getting the THIS_MODULE in > caller's context? > Yeah: that's probably what I'll do. The other possibility is to store the module pointer in the struct kunit context. > > In any case, does this seem like the right way forward? > > I am by no means an expert on this but this does look good to me. I > would keep this as clean, lean and simple as possible in order to keep > understanding / debugging the problems exposed by the tests as simple as > possible. At some point someone is wondering why a test fails, and ends > up looking through these helpers to ensure problem is no lurking > there... Hence, I'd kept the code there in minimum - meaning, I might > not add kunit class or even a driver until tests require that. (Even if > it would not look as good in the sysfs - as far as I understand the > kunit sysfs entries are a 'test feature' which should not be present in > 'production systems'. This is not an excuse to make things bad - but (in > my opinion) this is a good reason to prioritize simplicity. I agree with you that it's best to avoid complexity for as long as we reasonably can. I think that there are enough things which would benefit from having the driver stuff to make it worth having _something_ there, particularly since it makes this a more "normal" device, so hopefully will be less surprising. For sysfs, it's one of those things which shows up pretty rarely in day-to-day KUnit use, as most people are using the kunit.py script which has all of the tests built-in, and no userspace to look at sysfs from. That being said, that doesn't cover all use cases, and I definitely would rather not make sysfs unusably ugly for everyone else, so I'm happy to tidy it up. (I'm not planning to do a kunit class at the moment, though.) I _think_ this approach (once the details of the API and implementation are tidied up a bit) should sit in about the sweet spot for complexity, assuming there's nothing horribly wrong with it I haven't noticed. I suspect we're better off leaving some of the more advanced use-cases to implement their own way of instantiating devices, at least for now, and focus on getting these common cases right. Cheers, -- David --000000000000c174b905f7f5f8e7 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIPnwYJKoZIhvcNAQcCoIIPkDCCD4wCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg ggz5MIIEtjCCA56gAwIBAgIQeAMYYHb81ngUVR0WyMTzqzANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA3MjgwMDAwMDBaFw0yOTAzMTgwMDAwMDBaMFQxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMSowKAYDVQQDEyFHbG9iYWxTaWduIEF0bGFz IFIzIFNNSU1FIENBIDIwMjAwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCvLe9xPU9W dpiHLAvX7kFnaFZPuJLey7LYaMO8P/xSngB9IN73mVc7YiLov12Fekdtn5kL8PjmDBEvTYmWsuQS 6VBo3vdlqqXZ0M9eMkjcKqijrmDRleudEoPDzTumwQ18VB/3I+vbN039HIaRQ5x+NHGiPHVfk6Rx c6KAbYceyeqqfuJEcq23vhTdium/Bf5hHqYUhuJwnBQ+dAUcFndUKMJrth6lHeoifkbw2bv81zxJ 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