From patchwork Wed Jul 6 15:32:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Marek_Marczykowski-G=C3=B3recki?= X-Patchwork-Id: 12908231 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 lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 6B422CCA483 for ; Wed, 6 Jul 2022 15:33:10 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.362335.592363 (Exim 4.92) (envelope-from ) id 1o971O-0000eb-Kd; Wed, 06 Jul 2022 15:32:58 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 362335.592363; Wed, 06 Jul 2022 15:32:58 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o971O-0000e4-Ge; Wed, 06 Jul 2022 15:32:58 +0000 Received: by outflank-mailman (input) for mailman id 362335; Wed, 06 Jul 2022 15:32:57 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o971N-00081g-G8 for xen-devel@lists.xenproject.org; Wed, 06 Jul 2022 15:32:57 +0000 Received: from out4-smtp.messagingengine.com (out4-smtp.messagingengine.com [66.111.4.28]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id e86c1d32-fd40-11ec-924f-1f966e50362f; Wed, 06 Jul 2022 17:32:56 +0200 (CEST) Received: from compute4.internal (compute4.nyi.internal [10.202.2.44]) by mailout.nyi.internal (Postfix) with ESMTP id E7E865C013E; Wed, 6 Jul 2022 11:32:55 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute4.internal (MEProxy); Wed, 06 Jul 2022 11:32:55 -0400 Received: by mail.messagingengine.com (Postfix) with ESMTPA; Wed, 6 Jul 2022 11:32:54 -0400 (EDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: e86c1d32-fd40-11ec-924f-1f966e50362f DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= invisiblethingslab.com; h=cc:cc:content-transfer-encoding :content-type:date:date:from:from:in-reply-to:in-reply-to :message-id:mime-version:references:reply-to:sender:subject :subject:to:to; s=fm2; t=1657121575; x=1657207975; bh=/FmM9IRoHk jrJvz5SecKZ+9vnPpot8BHqRtqlD2wsdk=; b=TeSF8TQIHWZN5u8l7NlLQgmrM2 392VbjOuH3mKRqIp+KAzyPGq9YLgnpYQnIHQH0lzWrTp/kaCYeGzQjErBJWeo3tb MvJ+PLtttNzAuaScAuxBJFVnhq8ARuJRPzCTjpoda3gvSOUyz5kPLp3u9PMrRYiE 4Rbyna0jKb5qkWFntG+XleLPi8YfBW8SMrI8sTjk4jp/3vfxBgWQgQxq+T7+17MH oogqlRW0aOSO4qwhNLCcFLYZtMyPMVHy8687y0RyHpJmw4VGzxLv6VC1CgBad4V1 WrF8+c9rvESv1gtgD7V+tDZYtqTUsBxw+gKshhdqIdhOegoMfGTsARQNGH7Q== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding :content-type:date:date:feedback-id:feedback-id:from:from :in-reply-to:in-reply-to:message-id:mime-version:references :reply-to:sender:subject:subject:to:to:x-me-proxy:x-me-proxy :x-me-sender:x-me-sender:x-sasl-enc; s=fm3; t=1657121575; x= 1657207975; bh=/FmM9IRoHkjrJvz5SecKZ+9vnPpot8BHqRtqlD2wsdk=; b=v EBaxY41fGsJy42QkRx73YdFsYVw5q+FrdmcA8VDmYJrIVSqdhCONLT+l/sDgqjH7 sh11/yOHyqz85xdsmLAYB+CIlH67DFeSAvg7/3DeQyhmKJ8kIf/wf5GKjojrZZEq exuLtgrja6lWXvNf5ls0ALlDdlTN7e8llWpdlSvhFXCdSpiiY2WqyDNpdzPdOH4P 6vSynGaBwV8ityhz8IwgyNp/oUAnkruP0hXhiVRMNmqiEsF0voxcbPpfj/0095tb PEJ06OjS9HQCbcUsAY8QPymD7rXRBNNCNdSSeOQEngQ1W/juEQQIDlPtpvd4d+Hn SrMlgoqmUxD7QNoWrlc4Q== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvfedrudeifedgkeelucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhephffvvefufffkofgjfhggtgfgsehtkeertdertdejnecuhfhrohhmpeforghr vghkucforghrtgiihihkohifshhkihdqifpkrhgvtghkihcuoehmrghrmhgrrhgvkhesih hnvhhishhisghlvghthhhinhhgshhlrggsrdgtohhmqeenucggtffrrghtthgvrhhnpefg ueduhefgvdefheehudejheefudevueeghfekhfehleegveduteeuiedugffgffenucevlh hushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhgrihhlfhhrohhmpehmrghrmhgrrhgv khesihhnvhhishhisghlvghthhhinhhgshhlrggsrdgtohhm X-ME-Proxy: Feedback-ID: i1568416f:Fastmail From: =?utf-8?q?Marek_Marczykowski-G=C3=B3recki?= To: xen-devel@lists.xenproject.org Cc: =?utf-8?q?Marek_Marczykowski-G=C3=B3recki?= , Andrew Cooper , George Dunlap , Jan Beulich , Julien Grall , Stefano Stabellini , Wei Liu Subject: [PATCH v2 4/9] console: support multiple serial console simultaneously Date: Wed, 6 Jul 2022 17:32:09 +0200 Message-Id: X-Mailer: git-send-email 2.35.3 In-Reply-To: References: MIME-Version: 1.0 Previously only one serial console was supported at the same time. Using console=com1,dbgp,vga silently ignored all but last serial console (in this case: only dbgp and vga were active). Fix this by storing not a single sercon_handle, but an array of them, up to MAX_SERCONS entries. The value of MAX_SERCONS (4) is arbitrary, inspired by the number of SERHND_IDX values. Signed-off-by: Marek Marczykowski-Górecki --- xen/drivers/char/console.c | 58 ++++++++++++++++++++++++++++++--------- 1 file changed, 45 insertions(+), 13 deletions(-) diff --git a/xen/drivers/char/console.c b/xen/drivers/char/console.c index f9937c5134c0..44b703296487 100644 --- a/xen/drivers/char/console.c +++ b/xen/drivers/char/console.c @@ -113,7 +113,9 @@ static char *__read_mostly conring = _conring; static uint32_t __read_mostly conring_size = _CONRING_SIZE; static uint32_t conringc, conringp; -static int __read_mostly sercon_handle = -1; +#define MAX_SERCONS 4 +static int __read_mostly sercon_handle[MAX_SERCONS]; +static int __read_mostly nr_sercon_handle = 0; #ifdef CONFIG_X86 /* Tristate: 0 disabled, 1 user enabled, -1 default enabled */ @@ -395,9 +397,17 @@ static unsigned int serial_rx_cons, serial_rx_prod; static void (*serial_steal_fn)(const char *, size_t nr) = early_puts; +/* Redirect any console output to *fn*, if *handle* is configured as a console. */ int console_steal(int handle, void (*fn)(const char *, size_t nr)) { - if ( (handle == -1) || (handle != sercon_handle) ) + int i; + + if ( handle == -1 ) + return 0; + for ( i = 0; i < nr_sercon_handle; i++ ) + if ( handle == sercon_handle[i] ) + break; + if ( nr_sercon_handle && i == nr_sercon_handle ) return 0; if ( serial_steal_fn != NULL ) @@ -415,10 +425,13 @@ void console_giveback(int id) void console_serial_puts(const char *s, size_t nr) { + int i; + if ( serial_steal_fn != NULL ) serial_steal_fn(s, nr); else - serial_puts(sercon_handle, s, nr); + for ( i = 0; i < nr_sercon_handle; i++ ) + serial_puts(sercon_handle[i], s, nr); /* Copy all serial output into PV console */ pv_console_puts(s, nr); @@ -956,7 +969,7 @@ void guest_printk(const struct domain *d, const char *fmt, ...) void __init console_init_preirq(void) { char *p; - int sh; + int sh, i; serial_init_preirq(); @@ -977,7 +990,8 @@ void __init console_init_preirq(void) continue; else if ( (sh = serial_parse_handle(p)) >= 0 ) { - sercon_handle = sh; + if ( nr_sercon_handle < MAX_SERCONS ) + sercon_handle[nr_sercon_handle++] = sh; serial_steal_fn = NULL; } else @@ -996,7 +1010,8 @@ void __init console_init_preirq(void) opt_console_xen = 0; #endif - serial_set_rx_handler(sercon_handle, serial_rx); + for ( i = 0; i < nr_sercon_handle; i++ ) + serial_set_rx_handler(sercon_handle[i], serial_rx); pv_console_set_rx_handler(serial_rx); /* HELLO WORLD --- start-of-day banner text. */ @@ -1014,7 +1029,8 @@ void __init console_init_preirq(void) if ( opt_sync_console ) { - serial_start_sync(sercon_handle); + for ( i = 0; i < nr_sercon_handle; i++ ) + serial_start_sync(sercon_handle[i]); add_taint(TAINT_SYNC_CONSOLE); printk("Console output is synchronous.\n"); warning_add(warning_sync_console); @@ -1121,13 +1137,19 @@ int __init console_has(const char *device) void console_start_log_everything(void) { - serial_start_log_everything(sercon_handle); + int i; + + for ( i = 0; i < nr_sercon_handle; i++ ) + serial_start_log_everything(sercon_handle[i]); atomic_inc(&print_everything); } void console_end_log_everything(void) { - serial_end_log_everything(sercon_handle); + int i; + + for ( i = 0; i < nr_sercon_handle; i++ ) + serial_end_log_everything(sercon_handle[i]); atomic_dec(&print_everything); } @@ -1149,23 +1171,32 @@ void console_unlock_recursive_irqrestore(unsigned long flags) void console_force_unlock(void) { + int i; + watchdog_disable(); spin_debug_disable(); spin_lock_init(&console_lock); - serial_force_unlock(sercon_handle); + for ( i = 0 ; i < nr_sercon_handle ; i++ ) + serial_force_unlock(sercon_handle[i]); console_locks_busted = 1; console_start_sync(); } void console_start_sync(void) { + int i; + atomic_inc(&print_everything); - serial_start_sync(sercon_handle); + for ( i = 0 ; i < nr_sercon_handle ; i++ ) + serial_start_sync(sercon_handle[i]); } void console_end_sync(void) { - serial_end_sync(sercon_handle); + int i; + + for ( i = 0; i < nr_sercon_handle; i++ ) + serial_end_sync(sercon_handle[i]); atomic_dec(&print_everything); } @@ -1291,7 +1322,8 @@ static int suspend_steal_id; int console_suspend(void) { - suspend_steal_id = console_steal(sercon_handle, suspend_steal_fn); + if ( nr_sercon_handle ) + suspend_steal_id = console_steal(sercon_handle[0], suspend_steal_fn); serial_suspend(); return 0; }