From patchwork Mon Feb 19 09:02:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel van Vugt X-Patchwork-Id: 774171 Received: from smtp-relay-canonical-1.canonical.com (smtp-relay-canonical-1.canonical.com [185.125.188.121]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6B2431CD1F; Mon, 19 Feb 2024 09:03:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.125.188.121 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708333392; cv=none; b=Z4dOK8WnZ39wFZyUvARSZ6+TWq2UML2akWhtDyxDY6INIv0iG7tacYruune7MISmepW4cJqniNS5N0oyVIS6yfDdf/cl6oZPkNbwnWmFXJ2wKGiZ99Ay7+7IzpGDtuOySLvlPKVJgCEF+Hkpaoc/ha0T2pTJZeQynvN2mn5VqIM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708333392; c=relaxed/simple; bh=CV4GH9UNJ6zNQc6c5xVZP+xrV8bnxAF5VgMaNZ9XGwg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ErjP29qPeCIAT4yaF5t2D6yd7hcxHTc9pzQvrbYZrfyoEoqwloH3EpDiUGbcDPX10WlfY6QzgJSV/TNYVfpf+qmnIBpicj3QuswNvaBQOIptj7EJYroCK5heuDKGljvPJSLg5bzaxjKZAqTaLQRoqd02LTIc2GnGQwZB8crTpJQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=canonical.com; spf=pass smtp.mailfrom=canonical.com; dkim=pass (2048-bit key) header.d=canonical.com header.i=@canonical.com header.b=Al4oZOn0; arc=none smtp.client-ip=185.125.188.121 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=canonical.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=canonical.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=canonical.com header.i=@canonical.com header.b="Al4oZOn0" Received: from dragon.fritz.box (unknown [58.7.187.102]) (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 smtp-relay-canonical-1.canonical.com (Postfix) with ESMTPSA id 51F753FFCB; Mon, 19 Feb 2024 09:02:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1708333382; bh=qrYMi74bcCPFGEWKyxCuYJeZThHsF8LjYHDib4wabmI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Al4oZOn0ScbIR3AVLorfwEDF/5CS85wWgFVY3g4D7ozov/IfnGT0akRSxUmy80iY8 AIGO2ImJUtycicQQ0NWjANNxfA25Aez0V0SFYMzYJekRQjRpEYLofpXccbzv+Xnehq QRNVg9DeYX4WuNl7vJwzrOOEvvliQm/9X+0PaoI62CfumZv8aNBj/7fjxHkhBi7v4h iOYalDVjncZyQUSlH3vF9kqqiMbEnqQh/ZCh2WVt4YKCjutmP2Ah4Z2mI4o1XNpM25 sRQJYuxePHHme5hXF6zzuDeUo8Nsnmk4smFnYeFaElHDGZrfEdKAENnrJfD4mGrL5r rLL8F6ja+Lccg== From: Daniel van Vugt To: Cc: Daniel van Vugt , Greg Kroah-Hartman , Helge Deller , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 1/2] dummycon: Add dummycon_(un)register_switch_notifier Date: Mon, 19 Feb 2024 17:02:33 +0800 Message-ID: <20240219090239.22568-1-daniel.van.vugt@canonical.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-fbdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 To detect switch attempts before a real console exists. This will be used for the same purpose as dummycon_(un)register_output_notifier, for fbcon to detect a more polite time to take over. Signed-off-by: Daniel van Vugt --- drivers/video/console/dummycon.c | 35 +++++++++++++++++++++++++++----- include/linux/console.h | 2 ++ 2 files changed, 32 insertions(+), 5 deletions(-) diff --git a/drivers/video/console/dummycon.c b/drivers/video/console/dummycon.c index 14af5d9e13..55e9b600ce 100644 --- a/drivers/video/console/dummycon.c +++ b/drivers/video/console/dummycon.c @@ -83,6 +83,32 @@ static int dummycon_blank(struct vc_data *vc, int blank, int mode_switch) /* Redraw, so that we get putc(s) for output done while blanked */ return 1; } + +/* This is protected by the console_lock */ +static RAW_NOTIFIER_HEAD(dummycon_switch_nh); + +void dummycon_register_switch_notifier(struct notifier_block *nb) +{ + WARN_CONSOLE_UNLOCKED(); + + raw_notifier_chain_register(&dummycon_switch_nh, nb); +} + +void dummycon_unregister_switch_notifier(struct notifier_block *nb) +{ + WARN_CONSOLE_UNLOCKED(); + + raw_notifier_chain_unregister(&dummycon_switch_nh, nb); +} + +static int dummycon_switch(struct vc_data *vc) +{ + WARN_CONSOLE_UNLOCKED(); + + raw_notifier_call_chain(&dummycon_switch_nh, 0, vc); + + return 0; +} #else static void dummycon_putc(struct vc_data *vc, int c, int ypos, int xpos) { } static void dummycon_putcs(struct vc_data *vc, const unsigned short *s, @@ -91,6 +117,10 @@ static int dummycon_blank(struct vc_data *vc, int blank, int mode_switch) { return 0; } +static int dummycon_switch(struct vc_data *vc) +{ + return 0; +} #endif static const char *dummycon_startup(void) @@ -120,11 +150,6 @@ static bool dummycon_scroll(struct vc_data *vc, unsigned int top, return false; } -static int dummycon_switch(struct vc_data *vc) -{ - return 0; -} - /* * The console `switch' structure for the dummy console * diff --git a/include/linux/console.h b/include/linux/console.h index 779d388af8..8fd70ae623 100644 --- a/include/linux/console.h +++ b/include/linux/console.h @@ -531,5 +531,7 @@ extern void console_init(void); /* For deferred console takeover */ void dummycon_register_output_notifier(struct notifier_block *nb); void dummycon_unregister_output_notifier(struct notifier_block *nb); +void dummycon_register_switch_notifier(struct notifier_block *nb); +void dummycon_unregister_switch_notifier(struct notifier_block *nb); #endif /* _LINUX_CONSOLE_H */