From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 445BFCD6E60 for ; Wed, 3 Jun 2026 14:36:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=7xz1aX70qn9PI7ve+ARdDiOiusxyII7zIQ0VV5UGVp8=; b=Ra4OpzV80nYRflY9RBR+wVYhTr dEprQ4lEKQxRmyrrUy3pLb3BZHGBes/CA+p1wyoAKY2tXXlO6ObRjPVom/iK/feHnCtu3NxE5sE7w 96WGySic9sr2nq9PipHal6YMe7A4o8Hzy1iT6RCK0x1dltyMF+pLzBDmLcHXAT2rC6E5Csx1DZkPs dlT9No/Mv+iEAC+Lb+Sxb6ZZMtqXIyJ06TJDOX3uX4geBmrHuxVdY7WpJvTPFP+WzsHPNL3lBC51X i/YmI9WCC4TCY15TEGT/pV09GlISHSCR7csqIofxnnPcOknxQPBHmf9uXLN7lTg/5sU7bSZ0JX/m6 4hOWqMDg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wUmi8-0000000FGMj-0fIH; Wed, 03 Jun 2026 14:36:48 +0000 Received: from fhigh-a3-smtp.messagingengine.com ([103.168.172.154]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wUmi4-0000000FGJT-0LHM; Wed, 03 Jun 2026 14:36:45 +0000 Received: from phl-compute-06.internal (phl-compute-06.internal [10.202.2.46]) by mailfhigh.phl.internal (Postfix) with ESMTP id 7A3EC14000CC; Wed, 3 Jun 2026 10:36:41 -0400 (EDT) Received: from phl-frontend-04 ([10.202.2.163]) by phl-compute-06.internal (MEProxy); Wed, 03 Jun 2026 10:36:41 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shutemov.name; 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:subject:subject:to:to; s=fm2; t=1780497401; x= 1780583801; bh=7xz1aX70qn9PI7ve+ARdDiOiusxyII7zIQ0VV5UGVp8=; b=x pIDWgDakKPnOoL050NQ8/xbJ+zl2eU//r++7fa4cPBo8tWOz3JzyLQZjGrJ6x4rd 8RJngSLDi9vJKtfAoXPbMI/9AHpFwRnkFjqkeu8/7Gatdg+clqThvMliQCEK017E MxRKgjizwg3f5a10JtbYwvZksXuX4PGwdfAHfybFrpoKGhK6wyB9H3EBTe+IC2R+ Yl6NaZ1UTOIqZ+mVOifo4YRIFt1RnI2yafR9Q8NLpNLpOsgArqTKyEPQa+o4m/Wq NEiFPotX69DAFbEPgb8ltlQABvBysR49b3yDptmKkztak3bchDPznzIC1klAp4Pd IbYAxzTjnSg9QHMY0xPdg== 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:subject:subject:to:to:x-me-proxy:x-me-sender :x-me-sender:x-sasl-enc; s=fm1; t=1780497401; x=1780583801; bh=7 xz1aX70qn9PI7ve+ARdDiOiusxyII7zIQ0VV5UGVp8=; b=Ttqyi4M9W7O9CHzMY EwzZh7JYsqZJUNMRXmYWI2nectSS8yjilBXOnEa8sPcb4ruZj7lohy5sBjTFVcFw CP4Ke1Dmk/hDquLcCtfY5PUY+JWgHcGkeSt9tppZKJOnKoUs6qKHkuC7kX5rNFLc ymz70zoAqB3UbP5W7Wdt9BFdzexFdgYh+zpqhz90TgsPLV6pwXCumtiQHYhMjgCR hBCZFd8jWVdhdcX6yO7XCpM1b25Rl3AG1tb/MGFwqX4ic6paJBJejNtWW+07NPYK s5IG7o8d9TFXUnNp170ShfXosP11uwB+aqRGCqqAUMHfGVIYEKCNoO/JbD/OwWYe 68c0A== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: dmFkZTFVMaZNPrRvSfF6lMDYeRZ1GT+YvZmW7/XK/DI4veA79wFWZ3OTazeQfPnYwN97CC Cs7iG9lFDm4VwxgpNn+szFkMQ6p+sawghQpLMos458rKa6kqCjeLITn+xOFJRuLH44jdjC bYnKt60OIxUI0HzEiKQ/d/999Ki3O4KAWblGhTDaHqAwTlFtGQQ5XMSyzboPUJHYsMRxyM j/zwJItMy9TSzKSj2Y695qlb0/SVGvKOj9QbiUnxexRfYyaiNrFZ52yLjpFN+pCrTPE1BV zfeSjTVtTl0AdNVaDzT7MlIgVuikoL9aGaZH0Ygsy1IGcYaK7xBN9rEeaPK3HRSnq6UCLX 7mx1vjl6T+Qg3Dkz6sCPmZZWdbsSp+4rrU2Qbo/UdG6OHiNBWjv3g0zCjx2c0QDnaRY/7u wX21gKqXPZ/zlcGiVQ878DzqL9dpNYIVwUYc2Ef2C8hygYd+rQXQHSGcGXlWM4oHb9cJpx jBq87hbpXCmIpC3zmnf8JtPVlf8FETS3oGcoBXYstAasJ7BzndZOnPApmJMQpq5Gq9590f +Z96L7n12f6GLORHRpuJyuUPTIuHsLxGRjO5KICo2yip8yrOr9Tcv4W9PeZ+gP2RTH8joY E4548RaYz4CmiiLyX8dytqOYkH7mxiXTmkXufYEQQ9XcDvKqYBgKzRS/zmRg X-ME-Proxy: Feedback-ID: ie3994620:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Wed, 3 Jun 2026 10:36:40 -0400 (EDT) From: Kiryl Shutsemau To: Catalin Marinas , Will Deacon , James Morse Cc: Mark Rutland , Marc Zyngier , Doug Anderson , Petr Mladek , Thomas Gleixner , Andrew Morton , Baoquan He , Puranjay Mohan , Usama Arif , Breno Leitao , Julien Thierry , Lecopzer Chen , Sumit Garg , kernel-team@meta.com, kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, "Kiryl Shutsemau (Meta)" Subject: [PATCH 1/4] firmware: arm_sdei: add SDEI_EVENT_SIGNAL support Date: Wed, 3 Jun 2026 15:36:32 +0100 Message-ID: X-Mailer: git-send-email 2.54.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260603_073644_182183_87DD05D4 X-CRM114-Status: GOOD ( 11.83 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: "Kiryl Shutsemau (Meta)" Add sdei_event_signal(), a thin wrapper over the SDEI_EVENT_SIGNAL call (DEN0054) that makes the software-signalled event (event 0) pending on a target PE -- delivered NMI-like even when that PE has interrupts masked. It takes no locks, so it is safe to call from NMI / crash context. Signed-off-by: Kiryl Shutsemau (Meta) --- drivers/firmware/arm_sdei.c | 12 ++++++++++++ include/linux/arm_sdei.h | 6 ++++++ include/uapi/linux/arm_sdei.h | 1 + 3 files changed, 19 insertions(+) diff --git a/drivers/firmware/arm_sdei.c b/drivers/firmware/arm_sdei.c index f39ed7ba3a38..e3fd604d9894 100644 --- a/drivers/firmware/arm_sdei.c +++ b/drivers/firmware/arm_sdei.c @@ -339,6 +339,18 @@ static void _ipi_unmask_cpu(void *ignored) sdei_unmask_local_cpu(); } +/* + * Signal the software-signalled event (event 0) to @mpidr. Does nothing + * but the SMC -- no locks, no event lookup -- so it is safe from NMI / + * crash context (e.g. the cross-CPU NMI service). + */ +int sdei_event_signal(u32 event_num, u64 mpidr) +{ + return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_SIGNAL, event_num, + mpidr, 0, 0, 0, NULL); +} +NOKPROBE_SYMBOL(sdei_event_signal); + static void _ipi_private_reset(void *ignored) { int err; diff --git a/include/linux/arm_sdei.h b/include/linux/arm_sdei.h index f652a5028b59..3f3ec01155e8 100644 --- a/include/linux/arm_sdei.h +++ b/include/linux/arm_sdei.h @@ -37,6 +37,12 @@ int sdei_event_unregister(u32 event_num); int sdei_event_enable(u32 event_num); int sdei_event_disable(u32 event_num); +/* + * Signal the software-signalled event (event 0) to another PE, NMI-like. + * @mpidr is the target's MPIDR affinity. + */ +int sdei_event_signal(u32 event_num, u64 mpidr); + /* GHES register/unregister helpers */ int sdei_register_ghes(struct ghes *ghes, sdei_event_callback *normal_cb, sdei_event_callback *critical_cb); diff --git a/include/uapi/linux/arm_sdei.h b/include/uapi/linux/arm_sdei.h index af0630ba5437..22eb61612673 100644 --- a/include/uapi/linux/arm_sdei.h +++ b/include/uapi/linux/arm_sdei.h @@ -22,6 +22,7 @@ #define SDEI_1_0_FN_SDEI_PE_UNMASK SDEI_1_0_FN(0x0C) #define SDEI_1_0_FN_SDEI_INTERRUPT_BIND SDEI_1_0_FN(0x0D) #define SDEI_1_0_FN_SDEI_INTERRUPT_RELEASE SDEI_1_0_FN(0x0E) +#define SDEI_1_0_FN_SDEI_EVENT_SIGNAL SDEI_1_0_FN(0x0F) #define SDEI_1_0_FN_SDEI_PRIVATE_RESET SDEI_1_0_FN(0x11) #define SDEI_1_0_FN_SDEI_SHARED_RESET SDEI_1_0_FN(0x12) -- 2.54.0