From patchwork Wed Sep 30 21:17:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 11810279 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 E2648618 for ; Wed, 30 Sep 2020 21:16:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C6E792075F for ; Wed, 30 Sep 2020 21:16:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="qA0BKeGO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730723AbgI3VQX (ORCPT ); Wed, 30 Sep 2020 17:16:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39548 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730695AbgI3VQS (ORCPT ); Wed, 30 Sep 2020 17:16:18 -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 ADA58C0613D0; Wed, 30 Sep 2020 14:16:18 -0700 (PDT) Received: by mail-pg1-x542.google.com with SMTP id t14so1939786pgl.10; Wed, 30 Sep 2020 14:16:18 -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=2U/fjg//jswj3Yudi2Db1uBr5ff+2io2dnuoLW/qR0A=; b=qA0BKeGOCvBF9bL80rgHz360wFyWQUEkiHm4zDy+G1Vi2O18MzTYl4/04CVlt8FHMb 7mOK9eG8CD5gzFIeVmFNyVVZGTZpx0EIsMHkCHoJNO782DwRYy1Vm12N7Dy47k9CTnHM pTCaeZhi4OF0dOqujGlBpf+cf4xCQnevxhOztZC2hXzlVLX1cN+ZQqdMXFtXlsVKmD2O 1IiwohPL5VpKhw6nGriSvKODwJ+g7dCmaHjOWXhCiTx+7w9CWmLoRVk7mHXL4bnQ2LtC QM3oKuE3lfL84CDD+Mv+vWcDMce0nLwUsNUQBEC7aE3rVBZhNf0HcmavkdkvKzipiAQY LX4w== 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=2U/fjg//jswj3Yudi2Db1uBr5ff+2io2dnuoLW/qR0A=; b=epKIQ5VOoIDV9XaFfGYvWym/e2XXcIVmJLDxnP9FXRdtPQhXFdg68+J3mmlcvD7Js5 bbDaGJcLbZ5t6IwcPryH3yXOWVqiZi3BJXXo3aF0f1mJzaFQkOCkWUZ0NbpWbq6EGkKu DBbAKZACwrrhGB2SYm81G+nNrvBuXd8qOIfat9potk4nvxWVqmPV5Nbp/J0huByMhipb jK2gWzdiEA5Ufsiukx2tBkJLoyvyjQVia38i4PCH/eweu0u7MfDZnZrth2ynKWA16OEv 4YHnN2eRLqyP7A6z2dEeCiY2i+CVU2iAlvSkaCcFrrMrivGnYwaWf8LvHUEN2QTGrtXs aOzg== X-Gm-Message-State: AOAM530Ewam7T08BRGDMSLS4/Qq6tnXTE0sLN45khZ38WM5brF4AQkdB WSC+ALesFmYXUkfvH0Uw1RU= X-Google-Smtp-Source: ABdhPJwTRuxYSLgbeUmLAYi4ke/Rev9ysHOLICTOKEacpnjGaRU4LkJop3kZqCMXI2Gd88aZDrdvSw== X-Received: by 2002:a17:902:d888:b029:d0:cb2d:f274 with SMTP id b8-20020a170902d888b02900d0cb2df274mr3965422plz.13.1601500578174; Wed, 30 Sep 2020 14:16:18 -0700 (PDT) Received: from localhost ([2601:1c0:5200:a6:307:a401:7b76:c6e5]) by smtp.gmail.com with ESMTPSA id n2sm3609064pfe.208.2020.09.30.14.16.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Sep 2020 14:16:17 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org, Tejun Heo , timmurray@google.com, Daniel Vetter , Qais Yousef , Rob Clark , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v2 3/3] drm: Expose CRTC's kworker task id Date: Wed, 30 Sep 2020 14:17:22 -0700 Message-Id: <20200930211723.3028059-4-robdclark@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200930211723.3028059-1-robdclark@gmail.com> References: <20200930211723.3028059-1-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 userspace to control the scheduling policy and priority. In particular if the userspace half of the display pipeline is SCHED_FIFO then it will want to use the same scheduling policy and an appropriate priority to ensure that it is not preempting commit_work. Signed-off-by: Rob Clark --- drivers/gpu/drm/drm_crtc.c | 3 +++ drivers/gpu/drm/drm_mode_config.c | 14 ++++++++++++++ drivers/gpu/drm/drm_mode_object.c | 4 ++++ include/drm/drm_mode_config.h | 9 +++++++++ include/drm/drm_property.h | 9 +++++++++ 5 files changed, 39 insertions(+) diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 4f7c0bfce0a3..1828853542dc 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -334,6 +334,9 @@ int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc, crtc->worker = NULL; return ret; } + + drm_object_attach_property(&crtc->base, + config->kwork_tid_property, 0); } return 0; diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c index f1affc1bb679..b11a1fc8ed0d 100644 --- a/drivers/gpu/drm/drm_mode_config.c +++ b/drivers/gpu/drm/drm_mode_config.c @@ -215,6 +215,13 @@ static const struct drm_prop_enum_list drm_plane_type_enum_list[] = { { DRM_PLANE_TYPE_CURSOR, "Cursor" }, }; +static int get_kwork_tid(struct drm_mode_object *obj, uint64_t *val) +{ + struct drm_crtc *crtc = obj_to_crtc(obj); + *val = task_pid_vnr(crtc->worker->task); + return 0; +} + static int drm_mode_create_standard_properties(struct drm_device *dev) { struct drm_property *prop; @@ -371,6 +378,13 @@ static int drm_mode_create_standard_properties(struct drm_device *dev) return -ENOMEM; dev->mode_config.modifiers_property = prop; + prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC, + "KWORK_TID", 0, UINT_MAX); + if (!prop) + return -ENOMEM; + prop->get_value = get_kwork_tid; + dev->mode_config.kwork_tid_property = prop; + return 0; } diff --git a/drivers/gpu/drm/drm_mode_object.c b/drivers/gpu/drm/drm_mode_object.c index db05f386a709..1a4df65baf0f 100644 --- a/drivers/gpu/drm/drm_mode_object.c +++ b/drivers/gpu/drm/drm_mode_object.c @@ -285,6 +285,7 @@ int drm_object_property_set_value(struct drm_mode_object *obj, WARN_ON(drm_drv_uses_atomic_modeset(property->dev) && !(property->flags & DRM_MODE_PROP_IMMUTABLE)); + WARN_ON(property->get_value); for (i = 0; i < obj->properties->count; i++) { if (obj->properties->properties[i] == property) { @@ -303,6 +304,9 @@ static int __drm_object_property_get_value(struct drm_mode_object *obj, { int i; + if (property->get_value) + return property->get_value(obj, val); + /* read-only properties bypass atomic mechanism and still store * their value in obj->properties->values[].. mostly to avoid * having to deal w/ EDID and similar props in atomic paths: diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h index c2d3d71d133c..7244df926a6d 100644 --- a/include/drm/drm_mode_config.h +++ b/include/drm/drm_mode_config.h @@ -926,6 +926,15 @@ struct drm_mode_config { */ struct drm_property *modifiers_property; + /** + * @kwork_tid_property: CRTC property to expose the task-id of the per- + * CRTC kthread-worker, used for non-block atomic commit. This is exposed + * to userspace, to allow userspace to control the scheduling policy and + * priority, as this is a decision that depends on how userspace structures + * it's rendering pipeline. + */ + struct drm_property *kwork_tid_property; + /* cursor size */ uint32_t cursor_width, cursor_height; diff --git a/include/drm/drm_property.h b/include/drm/drm_property.h index 4a0a80d658c7..6843be6aa3ec 100644 --- a/include/drm/drm_property.h +++ b/include/drm/drm_property.h @@ -188,6 +188,15 @@ struct drm_property { * enum and bitmask values. */ struct list_head enum_list; + + /** + * @get_value: accessor to get current value for "virtual" properties + * + * For properties with dynamic values, where it is for whatever reason + * not feasible to keep updated with drm_object_property_set_value(), + * this callback can be used to retrieve the current value on demand. + */ + int (*get_value)(struct drm_mode_object *obj, uint64_t *val); }; /**