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 F3F61C27C53 for ; Wed, 19 Jun 2024 08:12:08 +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: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Subject:CC:To: From:Date:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=OXJ+nv7cbapEXpU/i6EuHZygFxSFq7qh473z8nM4iTE=; b=S8JGoox32/sUQwLsTSLsoeOPgC 3brMpDvdcz38tM2HFiFT4JCHBC78islQCD10rYW7hs/PcHOBB8XtozBVPbkROkQIBdN/gmQzv0UBt MFZfPu/q1PYXkPf3d+6GoWYHBizLVfGtH+iZ43jJ4hD3/PSi/tojjRsNlJXwZgs4aPbscA+Xzw0wO 21/TN5HLoeaThd09yTmyvV7VLW3PnzbC9VbD/eEeCBqi4Q4Eu2cKlGwbpOWgbKWUJpePDPc7CKkyq jFeBBqWuFMTXoGBoZjfU5pl16VNT2kkZwhxZrBhIXR2MvnB1hopnd3mPbpvQQiD37IfSnJ5roK/rN XcPPJs9g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sJqQ5-00000000LGL-00ve; Wed, 19 Jun 2024 08:11:53 +0000 Received: from frasgout.his.huawei.com ([185.176.79.56]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sJqQ0-00000000LDu-16SP for linux-arm-kernel@lists.infradead.org; Wed, 19 Jun 2024 08:11:50 +0000 Received: from mail.maildlp.com (unknown [172.18.186.231]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4W3x6B2f2tz6JB5T; Wed, 19 Jun 2024 16:06:42 +0800 (CST) Received: from lhrpeml500005.china.huawei.com (unknown [7.191.163.240]) by mail.maildlp.com (Postfix) with ESMTPS id 32FD9140B63; Wed, 19 Jun 2024 16:11:40 +0800 (CST) Received: from localhost (10.203.174.77) by lhrpeml500005.china.huawei.com (7.191.163.240) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Wed, 19 Jun 2024 09:11:39 +0100 Date: Wed, 19 Jun 2024 09:11:37 +0100 From: Jonathan Cameron To: Marc Zyngier , Will Deacon , "Catalin Marinas" , , , , , , CC: Mark Rutland , Thomas Gleixner , Peter Zijlstra , , , Russell King , "Rafael J . Wysocki" , "Miguel Luis" , James Morse , "Salil Mehta" , Jean-Philippe Brucker , Hanjun Guo , Gavin Shan , Ingo Molnar , Borislav Petkov , Dave Hansen , , Subject: Re: [PATCH v10 13/19] irqchip/gic-v3: Don't return errors from gic_acpi_match_gicc() Message-ID: <20240619091122.00003a9e@huawei.com> In-Reply-To: <20240529133446.28446-14-Jonathan.Cameron@huawei.com> References: <20240529133446.28446-1-Jonathan.Cameron@huawei.com> <20240529133446.28446-14-Jonathan.Cameron@huawei.com> Organization: Huawei Technologies Research and Development (UK) Ltd. X-Mailer: Claws Mail 4.1.0 (GTK 3.24.33; x86_64-w64-mingw32) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.203.174.77] X-ClientProxiedBy: lhrpeml500003.china.huawei.com (7.191.162.67) To lhrpeml500005.china.huawei.com (7.191.163.240) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240619_011148_645067_38CA6BFE X-CRM114-Status: GOOD ( 26.41 ) 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 On Wed, 29 May 2024 14:34:40 +0100 Jonathan Cameron wrote: > From: James Morse > > gic_acpi_match_gicc() is only called via gic_acpi_count_gicr_regions(). > It should only count the number of enabled redistributors, but it > also tries to sanity check the GICC entry, currently returning an > error if the Enabled bit is set, but the gicr_base_address is zero. > > Adding support for the online-capable bit to the sanity check will > complicate it, for no benefit. The existing check implicitly depends on > gic_acpi_count_gicr_regions() previous failing to find any GICR regions > (as it is valid to have gicr_base_address of zero if the redistributors > are described via a GICR entry). > > Instead of complicating the check, remove it. Failures that happen at > this point cause the irqchip not to register, meaning no irqs can be > requested. The kernel grinds to a panic() pretty quickly. > > Without the check, MADT tables that exhibit this problem are still > caught by gic_populate_rdist(), which helpfully also prints what went > wrong: > | CPU4: mpidr 100 has no re-distributor! > > Signed-off-by: James Morse > Reviewed-by: Gavin Shan > Tested-by: Miguel Luis > Signed-off-by: Russell King (Oracle) > Reviewed-by: Jonathan Cameron > Signed-off-by: Jonathan Cameron Sorry. I managed not to pick up Marc's RB form v8 and this patch is unchanged. https://lore.kernel.org/all/87jzkktaui.wl-maz@kernel.org/ Hopefully whoever picks this up is using tooling (b4 or similar) that will get it from here. Reviewed-by: Marc Zyngier So just patch 14 waiting for Marc to take another glance. > --- > drivers/irqchip/irq-gic-v3.c | 13 ++----------- > 1 file changed, 2 insertions(+), 11 deletions(-) > > diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c > index 6fb276504bcc..10af15f93d4d 100644 > --- a/drivers/irqchip/irq-gic-v3.c > +++ b/drivers/irqchip/irq-gic-v3.c > @@ -2415,19 +2415,10 @@ static int __init gic_acpi_match_gicc(union acpi_subtable_headers *header, > * If GICC is enabled and has valid gicr base address, then it means > * GICR base is presented via GICC > */ > - if (acpi_gicc_is_usable(gicc) && gicc->gicr_base_address) { > + if (acpi_gicc_is_usable(gicc) && gicc->gicr_base_address) > acpi_data.enabled_rdists++; > - return 0; > - } > > - /* > - * It's perfectly valid firmware can pass disabled GICC entry, driver > - * should not treat as errors, skip the entry instead of probe fail. > - */ > - if (!acpi_gicc_is_usable(gicc)) > - return 0; > - > - return -ENODEV; > + return 0; > } > > static int __init gic_acpi_count_gicr_regions(void)