From patchwork Fri Nov 15 13:40:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jocelyn Falempe X-Patchwork-Id: 13876329 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 38D79D68BC0 for ; Fri, 15 Nov 2024 14:30:36 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B476910E86A; Fri, 15 Nov 2024 14:30:35 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.b="VdT9e4sL"; dkim-atps=neutral Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4DC9B10E86A for ; Fri, 15 Nov 2024 14:30:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1731681033; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=PqzXwfom8uMA5cWS07luULgcBuSRhlxoOEl4sjQVQRQ=; b=VdT9e4sLmgvU/CcQt4y9UcmJeYHP4p7I/kwXoKwqObd8Pq/j3J3QB7Kj0HH7BZiUm6x75p kW+kNcB8TpP8bpnDWTasDIlMp7d0peQjBG35OomtpS9qQvs5BrShnbkpdBolT+coDi6TnE DLvmSh5LclkZBvLa1f9rVyfG1XbrIzY= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-439-LpYCq0O1Mw2Wmk6bm7DzLw-1; Fri, 15 Nov 2024 09:30:30 -0500 X-MC-Unique: LpYCq0O1Mw2Wmk6bm7DzLw-1 X-Mimecast-MFC-AGG-ID: LpYCq0O1Mw2Wmk6bm7DzLw Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 530591955F2B; Fri, 15 Nov 2024 14:30:27 +0000 (UTC) Received: from hydra.redhat.com (unknown [10.39.194.181]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 66D501956089; Fri, 15 Nov 2024 14:30:23 +0000 (UTC) From: Jocelyn Falempe To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , John Ogness , Javier Martinez Canillas , "Guilherme G . Piccoli" , bluescreen_avenger@verizon.net, Caleb Connolly , Petr Mladek , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Cc: Jocelyn Falempe Subject: [PATCH v8 3/6] drm/log: Do not draw if drm_master is taken Date: Fri, 15 Nov 2024 14:40:40 +0100 Message-ID: <20241115142950.1758007-4-jfalempe@redhat.com> In-Reply-To: <20241115142950.1758007-1-jfalempe@redhat.com> References: <20241115142950.1758007-1-jfalempe@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 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: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" When userspace takes drm_master, the drm_client buffer is no more visible, so drm_log shouldn't waste CPU cycle to draw on it. Signed-off-by: Jocelyn Falempe --- drivers/gpu/drm/clients/drm_log.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/clients/drm_log.c b/drivers/gpu/drm/clients/drm_log.c index cb793a348f1f9..8eca8044f1f08 100644 --- a/drivers/gpu/drm/clients/drm_log.c +++ b/drivers/gpu/drm/clients/drm_log.c @@ -19,6 +19,7 @@ #include "drm_client_internal.h" #include "../drm_draw.h" +#include "../drm_internal.h" MODULE_AUTHOR("Jocelyn Falempe"); MODULE_DESCRIPTION("DRM boot logger"); @@ -308,8 +309,13 @@ static void drm_log_write_thread(struct console *con, struct nbcon_write_context if (!dlog->probed) drm_log_init_client(dlog); - for (i = 0; i < dlog->n_scanout; i++) - drm_log_draw_kmsg_record(&dlog->scanout[i], wctxt->outbuf, wctxt->len); + /* Check that we are still the master before drawing */ + if (drm_master_internal_acquire(dlog->client.dev)) { + drm_master_internal_release(dlog->client.dev); + + for (i = 0; i < dlog->n_scanout; i++) + drm_log_draw_kmsg_record(&dlog->scanout[i], wctxt->outbuf, wctxt->len); + } } static void drm_log_lock(struct console *con, unsigned long *flags)