From patchwork Tue May 10 15:58:23 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: 12845211 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 9E9B6C433FE for ; Tue, 10 May 2022 15:58:57 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.325838.548595 (Exim 4.92) (envelope-from ) id 1noSG2-0007kx-AR; Tue, 10 May 2022 15:58:42 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 325838.548595; Tue, 10 May 2022 15:58:42 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1noSG2-0007kq-7P; Tue, 10 May 2022 15:58:42 +0000 Received: by outflank-mailman (input) for mailman id 325838; Tue, 10 May 2022 15:58:40 +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 1noSG0-0007kf-NJ for xen-devel@lists.xenproject.org; Tue, 10 May 2022 15:58:40 +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 0e838c96-d07a-11ec-8fc4-03012f2f19d4; Tue, 10 May 2022 17:58:39 +0200 (CEST) Received: from compute5.internal (compute5.nyi.internal [10.202.2.45]) by mailout.nyi.internal (Postfix) with ESMTP id 976445C01D9; Tue, 10 May 2022 11:58:38 -0400 (EDT) Received: from mailfrontend2 ([10.202.2.163]) by compute5.internal (MEProxy); Tue, 10 May 2022 11:58:38 -0400 Received: by mail.messagingengine.com (Postfix) with ESMTPA; Tue, 10 May 2022 11:58:37 -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: 0e838c96-d07a-11ec-8fc4-03012f2f19d4 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding :content-type:date:date:from:from:in-reply-to:message-id :mime-version:reply-to:sender:subject:subject:to:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm1; t= 1652198318; x=1652284718; bh=mYaKCBVQq7I6CRUH5kFvTjqejzct4Ce/08q PdhMHtqA=; b=ISN6lIMRNWS7GfQpVhKKFleTmeaoYkgMQmQV92FhZI5Mg8oNVM5 E8j2p4osLHk+cqWLS5vnBOdQGFnSTD0bx6rW1MAEli4C9nSxPu0QK4tuvIvpNvU9 x6gSjdvd0jJ6aYDXLVur8eAZuBrhifQwFqaG/QwaKXyBNlcdrUjp4dAYHWDLayIH +Ep5x0MJYHA//dNkzhS6jNBPq7cV/OjQJWA74tgFCo3RcMmhVfaUwDBUq6YNWDUW BF/rG4lUUQr3hL77nS0lKHMa6w6Ap3CIRj9vfrTgGgla94T++HWKrP8Hu+zl+Wsd V6SDXVjkU92LhEXOD3C6u/M6qOenmgomycA== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvfedrgedugdeltdcutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenuc fjughrpefhvfevufffkffogggtgfesthekredtredtjeenucfhrhhomhepofgrrhgvkhcu ofgrrhgtiiihkhhofihskhhiqdfikphrvggtkhhiuceomhgrrhhmrghrvghksehinhhvih hsihgslhgvthhhihhnghhslhgrsgdrtghomheqnecuggftrfgrthhtvghrnhepleekhfdu leetleelleetteevfeefteffkeetteejheelgfegkeelgeehhfdthedvnecuvehluhhsth gvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomhepmhgrrhhmrghrvghksehi nhhvihhsihgslhgvthhhihhnghhslhgrsgdrtghomh X-ME-Proxy: 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 v3 1/2] ns16550: reject IRQ above nr_irqs_gsi Date: Tue, 10 May 2022 17:58:23 +0200 Message-Id: <20220510155824.1779789-1-marmarek@invisiblethingslab.com> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 Intel LPSS has INTERRUPT_LINE set to 0xff by default, that is declared by the PCI Local Bus Specification Revision 3.0 (from 2004) as "unknown"/"no connection". Fallback to poll mode in this case. Signed-off-by: Marek Marczykowski-Górecki --- Changes in v3: - change back to checking 0xff explicitly - adjust commit message, include spec reference - change warning to match the above Changes in v2: - add log message - extend commit message - code style fix --- xen/drivers/char/ns16550.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/xen/drivers/char/ns16550.c b/xen/drivers/char/ns16550.c index fb75cee4a13a..b4434ad815e1 100644 --- a/xen/drivers/char/ns16550.c +++ b/xen/drivers/char/ns16550.c @@ -1238,6 +1238,15 @@ pci_uart_config(struct ns16550 *uart, bool_t skip_amt, unsigned int idx) pci_conf_read8(PCI_SBDF(0, b, d, f), PCI_INTERRUPT_LINE) : 0; + if ( uart->irq == 0xff ) + { + printk(XENLOG_WARNING + "ns16550: %02x:%02x.%u has no legacy IRQ %d, " + "falling back to a poll mode\n", + b, d, f, uart->irq); + uart->irq = 0; + } + return 0; } }