From patchwork Sat Sep 19 19:37:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 11787267 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BB9276CA for ; Sat, 19 Sep 2020 19:36:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A00F421D42 for ; Sat, 19 Sep 2020 19:36:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="lg7Ubyu9" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726511AbgISTgm (ORCPT ); Sat, 19 Sep 2020 15:36:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43496 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726668AbgISTgk (ORCPT ); Sat, 19 Sep 2020 15:36:40 -0400 Received: from mail-pg1-x542.google.com (mail-pg1-x542.google.com [IPv6:2607:f8b0:4864:20::542]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C3F52C0613CE; Sat, 19 Sep 2020 12:36:40 -0700 (PDT) Received: by mail-pg1-x542.google.com with SMTP id o25so595387pgm.0; Sat, 19 Sep 2020 12:36:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ZcEhH3LkJwJxm1/YqfDogAmQdhcYfaMPXbiNt/rTvIg=; b=lg7Ubyu9WAKxfdBXsHIE0fpkFazRYiZBfqd7ekL+E3pANQ48iJwjSskg8Eb9/Ipxum vvea2HDVe246HhZnx09J5sw/zvLq+X/chYapub84dru4tTYVy5R6QlX8GixKSFMagOqr SiDjzfINE3Gr2AYrazENBJHXI+Xn+YIRbwOlharJlTl5xZXu9vm38MHB1s4zUFuB4X4w sskrIy020y6bFI7vAwFVJ1MBDQ8yjM9uudCvs1Vou9g4OTbf5XR0romkoa4Qu00sItUw Bs/0LoQsCfY349hIqWWmcPkKqQYRpNNjg2x6zMmr1m78mxkQkWqa7pQQL9OI+pbzk/bc iXcQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ZcEhH3LkJwJxm1/YqfDogAmQdhcYfaMPXbiNt/rTvIg=; b=sIJjmPC3vp4FWjMs82jU4+zm+rFHgXOxXz6NL9p5PKjKJxplT2SZ7KtOC4Pu4nvgBE 9/2HveOjj66nBiAWa7Bswp4zLIutmXxiA0XN4+mt07v76Om1iQt44wSLZ+yBDS2TJOlE euamYG2mMRL5cfXeRpPA0DsCtngDwLp9l1jfnS8yq7cCrJ4BJUzzNFV3/MvLOh5Z1g1u sxXqaeZMB2VCsRCMQRbpP1wqg97iJa8oGRsj1uEvqp2uzJmkfs8hHFVrjH4sa9step87 jjCMpMhlTt4IJJt/aVXG+TOlEQVzTlyCD66jvrI1Ucc5FfFl9jejqLqADbXmKgSIVg7Z yGRA== X-Gm-Message-State: AOAM533Jy6tiHbjjgymZohtFksaD6OOvXNhJtsuznxjqOwZuyy8J0cOK 2vvw5mQ3Fr2orCaP2e1eJfk= X-Google-Smtp-Source: ABdhPJw1pkeptMx0qD+T+XhkQAyHm1sDInLhYFcOAYQh5gmEsV+WcdgYPL5u/76isoo3XZIVFAt6Xg== X-Received: by 2002:a65:6088:: with SMTP id t8mr26953418pgu.404.1600544200308; Sat, 19 Sep 2020 12:36:40 -0700 (PDT) Received: from localhost ([2601:1c0:5200:a6:307:a401:7b76:c6e5]) by smtp.gmail.com with ESMTPSA id q5sm7477198pfn.172.2020.09.19.12.36.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 19 Sep 2020 12:36:39 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: Peter Zijlstra , Tejun Heo , timmurray@google.com, linux-arm-msm@vger.kernel.org, Rob Clark , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , linux-kernel@vger.kernel.org (open list) Subject: [PATCH 2/3] drm/atomic: Use kthread worker for nonblocking commits Date: Sat, 19 Sep 2020 12:37:25 -0700 Message-Id: <20200919193727.2093945-3-robdclark@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200919193727.2093945-1-robdclark@gmail.com> References: <20200919193727.2093945-1-robdclark@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: Rob Clark This will allow us to more easily switch scheduling rules based on what userspace wants. Signed-off-by: Rob Clark --- drivers/gpu/drm/drm_atomic_helper.c | 13 ++++++++---- include/drm/drm_atomic.h | 31 +++++++++++++++++++++++++++++ 2 files changed, 40 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index 9e1ad493e689..75eeec5e7b10 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -1659,11 +1659,11 @@ static void commit_tail(struct drm_atomic_state *old_state) drm_atomic_state_put(old_state); } -static void commit_work(struct work_struct *work) +static void commit_work(struct kthread_work *work) { struct drm_atomic_state *state = container_of(work, struct drm_atomic_state, - commit_work); + commit_kwork); commit_tail(state); } @@ -1797,6 +1797,7 @@ int drm_atomic_helper_commit(struct drm_device *dev, struct drm_atomic_state *state, bool nonblock) { + struct kthread_worker *worker = NULL; int ret; if (state->async_update) { @@ -1814,7 +1815,7 @@ int drm_atomic_helper_commit(struct drm_device *dev, if (ret) return ret; - INIT_WORK(&state->commit_work, commit_work); + kthread_init_work(&state->commit_kwork, commit_work); ret = drm_atomic_helper_prepare_planes(dev, state); if (ret) @@ -1857,8 +1858,12 @@ int drm_atomic_helper_commit(struct drm_device *dev, */ drm_atomic_state_get(state); + if (nonblock) - queue_work(system_unbound_wq, &state->commit_work); + worker = drm_atomic_pick_worker(state); + + if (worker) + kthread_queue_work(worker, &state->commit_kwork); else commit_tail(state); diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h index d07c851d255b..8d0ee19953df 100644 --- a/include/drm/drm_atomic.h +++ b/include/drm/drm_atomic.h @@ -373,8 +373,18 @@ struct drm_atomic_state { * * Work item which can be used by the driver or helpers to execute the * commit without blocking. + * + * This is deprecated, use commit_kwork. */ struct work_struct commit_work; + + /** + * @commit_kwork: + * + * Work item which can be used by the driver or helpers to execute the + * commit without blocking. + */ + struct kthread_work commit_kwork; }; void __drm_crtc_commit_free(struct kref *kref); @@ -954,6 +964,27 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p); (new_obj_state) = (__state)->private_objs[__i].new_state, 1); \ (__i)++) +/** + * drm_atomic_pick_worker - helper to get kworker to use for nonblocking commit + * @state: the &drm_atomic_state for the commit + * + * Pick an appropriate worker for a given atomic update. The first CRTC + * invovled in the atomic update is used to pick the worker, to prevent + * serializing multiple pageflips / atomic-updates on indenpendent CRTCs. + */ +static inline struct kthread_worker * +drm_atomic_pick_worker(const struct drm_atomic_state *state) +{ + struct drm_crtc_state *crtc_state; + struct drm_crtc *crtc; + unsigned i; + + for_each_new_crtc_in_state(state, crtc, crtc_state, i) + return crtc->worker; + + return NULL; +} + /** * drm_atomic_crtc_needs_modeset - compute combined modeset need * @state: &drm_crtc_state for the CRTC