From nobody Sun Feb 8 10:33:48 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 228D4EB64D7 for ; Fri, 16 Jun 2023 11:25:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344965AbjFPLZb (ORCPT ); Fri, 16 Jun 2023 07:25:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45086 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235046AbjFPLZ2 (ORCPT ); Fri, 16 Jun 2023 07:25:28 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D8F511FF5 for ; Fri, 16 Jun 2023 04:25:27 -0700 (PDT) Date: Fri, 16 Jun 2023 11:25:24 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1686914725; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=jEUn0/f9FVUChE7Kl1tLCWJPDi1svyiHRZIFyQJfrAI=; b=u0p1fVB9n4LnPERCTGO+VZ1CcyV9aPXOGxpUi/ox6KqsoQZohb6CTQrTVHfWQxRixZd/Cw ljrlKBQk1KBet1qOZ4k0fikonbbWyeMpZ0kThQdrfCHva/Ff4Myp3vI1CAi5bhPs/YzSZg 3XAhaW9n3Z5/V2uzcYs8qd1BmDP9BKtcerIIzMmaOKQiRCtHcCLlaUr08XypguQ1+xAXX+ grzPkt2PPcNvXowtNFCblpcMxwrSM9h2UHklqt2iQH/8gR8G1nTxg/UXgw3Rq6ID8PrrX9 VHymYMV8t2M9GwyON0NBc00L6vHsBVIemx901k0FwyNY2P7kJDGJq1wPX6xSKQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1686914725; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=jEUn0/f9FVUChE7Kl1tLCWJPDi1svyiHRZIFyQJfrAI=; b=MYj3kp6Q27WnBrL6hJmIYYl7z9plCfRjRUTsawRabe5C7OipIYt9tjDpfxsIYHbXSxl1dB oZt3IM8/cTnyHlBQ== From: "irqchip-bot for James Gowans" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-kernel@vger.kernel.org Subject: [irqchip: irq/irqchip-next] irqchip/gic-v3-its: Enable RESEND_WHEN_IN_PROGRESS for LPIs Cc: Marc Zyngier , James Gowans , Thomas Gleixner , KarimAllah Raslan , Yipeng Zou , Zhang Jianhua In-Reply-To: <20230608120021.3273400-4-jgowans@amazon.com> References: <20230608120021.3273400-4-jgowans@amazon.com> MIME-Version: 1.0 Message-ID: <168691472458.404.8158933098572478728.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the irq/irqchip-next branch of ir= qchip: Commit-ID: 8f4b589595d01f882d63d21efe15af4a5ad7c59b Gitweb: https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-plat= forms/8f4b589595d01f882d63d21efe15af4a5ad7c59b Author: James Gowans AuthorDate: Thu, 08 Jun 2023 14:00:21 +02:00 Committer: Marc Zyngier CommitterDate: Fri, 16 Jun 2023 12:23:40 +01:00 irqchip/gic-v3-its: Enable RESEND_WHEN_IN_PROGRESS for LPIs GICv3 LPIs are impacted by an architectural design issue: they do not have a global active state and as such a given LPI can be delivered to a new CPU after an affinity change while the previous instance of the same LPI handler has not yet completed on the original CPU. If LPIs had an active state, this second LPI would not be delivered until the first CPU deactivated the initial LPI, just like SPIs. To solve this issue, use the newly introduced IRQD_RESEND_WHEN_IN_PROGRESS flag, ensuring that we do not lose an LPI being delivered during that window by getting the GIC to resend it. This workaround gets enabled for all LPIs, including the VPE doorbells. Suggested-by: Marc Zyngier Signed-off-by: James Gowans Cc: Thomas Gleixner Cc: Marc Zyngier Cc: KarimAllah Raslan Cc: Yipeng Zou Cc: Zhang Jianhua [maz: massaged commit message] Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20230608120021.3273400-4-jgowans@amazon.com --- drivers/irqchip/irq-gic-v3-its.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-= its.c index 0ec2b1e..1994541 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -3585,6 +3585,7 @@ static int its_irq_domain_alloc(struct irq_domain *do= main, unsigned int virq, irqd =3D irq_get_irq_data(virq + i); irqd_set_single_target(irqd); irqd_set_affinity_on_activate(irqd); + irqd_set_resend_when_in_progress(irqd); pr_debug("ID:%d pID:%d vID:%d\n", (int)(hwirq + i - its_dev->event_map.lpi_base), (int)(hwirq + i), virq + i); @@ -4523,6 +4524,7 @@ static int its_vpe_irq_domain_alloc(struct irq_domain= *domain, unsigned int virq irq_domain_set_hwirq_and_chip(domain, virq + i, i, irqchip, vm->vpes[i]); set_bit(i, bitmap); + irqd_set_resend_when_in_progress(irq_get_irq_data(virq + i)); } =20 if (err) {