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 X-Spam-Level: X-Spam-Status: No, score=-15.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 89CADC2D0E4 for ; Thu, 19 Nov 2020 09:59:47 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2AC0A22253 for ; Thu, 19 Nov 2020 09:59:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2AC0A22253 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4B9B389A76; Thu, 19 Nov 2020 09:59:46 +0000 (UTC) Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by gabe.freedesktop.org (Postfix) with ESMTPS id BE3AC89A76 for ; Thu, 19 Nov 2020 09:59:44 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 49998AA4F; Thu, 19 Nov 2020 09:59:43 +0000 (UTC) To: Maxime Ripard , Mark Rutland , Rob Herring , Frank Rowand , Eric Anholt , Daniel Vetter , David Airlie , Maarten Lankhorst References: <20201113152956.139663-1-maxime@cerno.tech> <20201113152956.139663-2-maxime@cerno.tech> From: Thomas Zimmermann Subject: Re: [PATCH 1/8] drm: Introduce an atomic_commit_setup function Message-ID: Date: Thu, 19 Nov 2020 10:59:42 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.0 MIME-Version: 1.0 In-Reply-To: <20201113152956.139663-2-maxime@cerno.tech> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Tim Gover , Dave Stevenson , Daniel Vetter , dri-devel@lists.freedesktop.org, bcm-kernel-feedback-list@broadcom.com, linux-rpi-kernel@lists.infradead.org, Phil Elwell , linux-arm-kernel@lists.infradead.org Content-Type: multipart/mixed; boundary="===============1444739470==" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --===============1444739470== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="2W0sLh3hYJ5LJMQDLuOIXQ9WTte0Yd3Os" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --2W0sLh3hYJ5LJMQDLuOIXQ9WTte0Yd3Os Content-Type: multipart/mixed; boundary="bUKJdqjueVcslnRq6dPhfZrAtf0Yym6XG"; protected-headers="v1" From: Thomas Zimmermann To: Maxime Ripard , Mark Rutland , Rob Herring , Frank Rowand , Eric Anholt , Daniel Vetter , David Airlie , Maarten Lankhorst Cc: linux-arm-kernel@lists.infradead.org, linux-rpi-kernel@lists.infradead.org, dri-devel@lists.freedesktop.org, Tim Gover , Phil Elwell , bcm-kernel-feedback-list@broadcom.com, Dave Stevenson , devicetree@vger.kernel.org, Daniel Vetter Message-ID: Subject: Re: [PATCH 1/8] drm: Introduce an atomic_commit_setup function References: <20201113152956.139663-1-maxime@cerno.tech> <20201113152956.139663-2-maxime@cerno.tech> In-Reply-To: <20201113152956.139663-2-maxime@cerno.tech> --bUKJdqjueVcslnRq6dPhfZrAtf0Yym6XG Content-Type: multipart/mixed; boundary="------------1FDC6A1299548E5BBCFE7D96" Content-Language: en-US This is a multi-part message in MIME format. --------------1FDC6A1299548E5BBCFE7D96 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable Hi Am 13.11.20 um 16:29 schrieb Maxime Ripard: > Private objects storing a state shared across all CRTCs need to be > carefully handled to avoid a use-after-free issue. >=20 > The proper way to do this to track all the commits using that shared > state and wait for the previous commits to be done before going on with= > the current one to avoid the reordering of commits that could occur. >=20 > However, this commit setup needs to be done after > drm_atomic_helper_setup_commit(), because before the CRTC commit > structure hasn't been allocated before, and before the workqueue is > scheduled, because we would be potentially reordered already otherwise.= >=20 > That means that drivers currently have to roll their own > drm_atomic_helper_commit() function, even though it would be identical > if not for the commit setup. >=20 > Let's introduce a hook to do so that would be called as part of > drm_atomic_helper_commit, allowing us to reuse the atomic helpers. >=20 > Suggested-by: Daniel Vetter > Signed-off-by: Maxime Ripard > --- > drivers/gpu/drm/drm_atomic_helper.c | 6 ++++++ > include/drm/drm_modeset_helper_vtables.h | 18 ++++++++++++++++++ > 2 files changed, 24 insertions(+) >=20 > diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_= atomic_helper.c > index ddd0e3239150..7d69c7844dfc 100644 > --- a/drivers/gpu/drm/drm_atomic_helper.c > +++ b/drivers/gpu/drm/drm_atomic_helper.c > @@ -2083,8 +2083,11 @@ int drm_atomic_helper_setup_commit(struct drm_at= omic_state *state, > struct drm_plane *plane; > struct drm_plane_state *old_plane_state, *new_plane_state; > struct drm_crtc_commit *commit; > + const struct drm_mode_config_helper_funcs *funcs; > int i, ret; > =20 > + funcs =3D state->dev->mode_config.helper_private; > + > for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_= state, i) { > commit =3D kzalloc(sizeof(*commit), GFP_KERNEL); > if (!commit) > @@ -2169,6 +2172,9 @@ int drm_atomic_helper_setup_commit(struct drm_ato= mic_state *state, > new_plane_state->commit =3D drm_crtc_commit_get(commit); > } > =20 > + if (funcs && funcs->atomic_commit_setup) > + return funcs->atomic_commit_setup(state); > + > return 0; > } > EXPORT_SYMBOL(drm_atomic_helper_setup_commit); > diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm= _modeset_helper_vtables.h > index f2de050085be..56470baf0513 100644 > --- a/include/drm/drm_modeset_helper_vtables.h > +++ b/include/drm/drm_modeset_helper_vtables.h > @@ -1396,6 +1396,24 @@ struct drm_mode_config_helper_funcs { > * drm_atomic_helper_commit_tail(). > */ > void (*atomic_commit_tail)(struct drm_atomic_state *state); > + > + /** > + * @atomic_commit_setup: > + * > + * This hook is used by the default atomic_commit() hook implemented = in > + * drm_atomic_helper_commit() together with the nonblocking helpers (= see > + * drm_atomic_helper_setup_commit()) to extend the DRM commit setup. = It > + * is not used by the atomic helpers. > + * > + * This function is called at the end of > + * drm_atomic_helper_setup_commit(), so once the commit has been > + * properly setup across the generic DRM object states. It allows > + * drivers to do some additional commit tracking that isn't related t= o a > + * CRTC, plane or connector, typically a private object. > + * > + * This hook is optional. > + */ > + int (*atomic_commit_setup)(struct drm_atomic_state *state); It feels hacky and screwed-on to me. I'd suggest to add an=20 atomic_commit_prepare callback that is called by drm_atomic_helper where = it currently calls drm_atomic_helper_setup_commit(). The default=20 implementation would include setup_commit and prepare_planes. Some=20 example code for drm_atomic_helper.c static int commit_prepare(state) { drm_atomic_helper_setup_commit(state) drm_atomic_helper_prepare_planes(state) } int drm_atomic_helper_commit() { if (async_update) { ... } if (funcs->atomic_commit_prepare) funcs->atomic_commit_prepare(state) else commit_prepare(state) /* the rest of the current function below */ INIT_WORK(&state->commit_work, commit_work); ... } Drivers that implement atomic_commit_prepare would be expected to call=20 drm_atomic_helper_setup_commit() and drm_atomic_helper_prepare_planes()=20 or their own implementation of them. The whole construct mimics how commit tails work. Best regards Thomas > }; > =20 > #endif >=20 --=20 Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 N=C3=BCrnberg, Germany (HRB 36809, AG N=C3=BCrnberg) Gesch=C3=A4ftsf=C3=BChrer: Felix Imend=C3=B6rffer --------------1FDC6A1299548E5BBCFE7D96 Content-Type: application/pgp-keys; name="OpenPGP_0x680DC11D530B7A23.asc" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="OpenPGP_0x680DC11D530B7A23.asc" -----BEGIN PGP PUBLIC KEY BLOCK----- xsBNBFs50uABCADEHPidWt974CaxBVbrIBwqcq/WURinJ3+2WlIrKWspiP83vfZKaXhFYsdgX= H47 fDVbPPj+d6tQrw5lPQCyqjwrCPYnq3WlIBnGPJ4/jreTL6V+qfKRDlGLWFjZcsrPJGE0BeB5B= bqP 5erN1qylK9i3gPoQjXGhpBpQYwRrEyQyjuvk+Ev0K1Jc5tVDeJAuau3TGNgah4YchdHm3bkPj= z9E ErV85RwvImQ1dptvx6s7xzwXTgGAsaYZsL8WCwDaTuqFa1d1jjlaxg6+tZsB9GluwvIhSezPg= nEm imZDkGnZRRSFiGP8yjqTjjWuf0bSj5rUnTGiyLyRZRNGcXmu6hjlABEBAAHNKFRob21hcyBaa= W1t ZXJtYW5uIDx0emltbWVybWFubkBzdXNlLmNvbT7CwI4EEwEIADgCGwMFCwkIBwIGFQoJCAsCB= BYC 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https://lists.freedesktop.org/mailman/listinfo/dri-devel --===============1444739470==--