From patchwork Tue Oct 24 15:18:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Russell King (Oracle)" X-Patchwork-Id: 13434944 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 2F196C07545 for ; Tue, 24 Oct 2023 15:21:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Date:Message-Id:MIME-Version:Subject:Cc :To:From:References:In-Reply-To:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=hzpDjRVm29CkhZzPE2ZnuK0Dd/qfN18XdUnchpWmOgo=; b=iL/i5f5Cb/ErE3 a9s5WKyq8UnR643twj0PEF6QjRoq9Pp7AdIrMTlqgVsTSqNBA/yvYwFDh9X3C+r45eyxYf+wgjcz2 iAd+AISKmZHMxROQjvdRzbIy46GXbZp+xXT2TjZbMcVQv4sgaiU/U1v3IYBwlgVugkBI/wdVKU509 LcH+sRtEMzKqu8xWZd4Md+renev8D5iRaF/O5TTZNUJAwBRp4hGXvkDhwc+gug7h+ehVWsr/gKjp8 1WPPBFkOlSyFSc16Gt2Q/NJzRkHyO529EKJvAtiCqcyU2pcReVEgrUUzs26tkLieNj73ZimArEXjj l3KcErur9qqyeVKDUjbw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qvJDl-00AIvF-14; Tue, 24 Oct 2023 15:21:29 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qvJBP-00AGpX-1t; Tue, 24 Oct 2023 15:19:03 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Date:Sender:Message-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:Subject:Cc:To:From:References: In-Reply-To:Reply-To:Content-ID:Content-Description; bh=NNfCkWmd5LT0BAlRMwpLRo9og9wq6dyC/LO+q6jD+yw=; b=GPKKYJxcxw57oC285ndZvwWMJj GupaUd+k9s0rp+Ykt/nydfK3oQXTDryykZFpwI53trBL6bn4BvSzhoMl+qjcWyZmYVfB6/auJpOlJ K6cd+pGp2pO90WRrQ1rHNicgF90qHULVHC7ejfeKQa8w0mXTNL6hxGM/Yxqc2ggip69ip3QH7QO3I PiD8St5Z4svt7Nt+yMC5+Pr9xwG3aeRs2HLZPEVIO8S97cf3VIDecttdTUXTMEZi1uL4SiPBDoUZs mKlExsy+STbaVGGJX6e6XMpfX20V+UZsfRkfZyyxrSN9mgmxI5WaMYycopNFeKk+bu34u62S2BdHk ttUhsgsg==; Received: from pandora.armlinux.org.uk ([2001:4d48:ad52:32c8:5054:ff:fe00:142]) by desiato.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qvJBL-00FbJx-2d; Tue, 24 Oct 2023 15:19:02 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Date:Sender:Message-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:Subject:Cc:To:From:References: In-Reply-To:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=NNfCkWmd5LT0BAlRMwpLRo9og9wq6dyC/LO+q6jD+yw=; b=pyT8sDn3D1Na/0O83HIphO1Ygc l6elglC6TwBupkx3TMPL6MHhd2AQ13+rYybnm0Z2pPCaFUuxwj82HJY+JIzqfk8mGsLNkv610UyCO Mu8peZB3jHlW2munKziOBEfKGZwJcPj8n/tN4OL3S9fexilLt0PcraVsNGn/RbnYJMs6Gx+A/yVsV 8Yb4sXGt74xXlYc6UEszKMH3by5XWusgwOTbCfqzHtABHHLYkGpXAcRtU6UgpuhZrNXk2EdBkqfEC gZrnaaFcBiIzZgVdZDiJT4aZixMrV3HtPxI0LxbVPyNoi1yiCfbQ6QuP6izPgBwNqRCmtL8esPEGk gnU6KdQw==; Received: from e0022681537dd.dyn.armlinux.org.uk ([fd8f:7570:feb6:1:222:68ff:fe15:37dd]:44458 helo=rmk-PC.armlinux.org.uk) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1qvJBE-0004VZ-1a; Tue, 24 Oct 2023 16:18:52 +0100 Received: from rmk by rmk-PC.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1qvJBF-00AqRw-Us; Tue, 24 Oct 2023 16:18:54 +0100 In-Reply-To: References: From: Russell King (Oracle) To: linux-pm@vger.kernel.org, loongarch@lists.linux.dev, linux-acpi@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, kvmarm@lists.linux.dev, x86@kernel.org, linux-csky@vger.kernel.org, linux-doc@vger.kernel.org, linux-ia64@vger.kernel.org, linux-parisc@vger.kernel.org Cc: Salil Mehta , Jean-Philippe Brucker , jianyong.wu@arm.com, justin.he@arm.com, James Morse , Marc Zyngier , Thomas Gleixner Subject: [PATCH 32/39] irqchip/gic-v3: Don't return errors from gic_acpi_match_gicc() MIME-Version: 1.0 Content-Disposition: inline Message-Id: Date: Tue, 24 Oct 2023 16:18:53 +0100 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231024_161900_282028_74F42450 X-CRM114-Status: GOOD ( 16.45 ) X-BeenThere: linux-riscv@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-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org 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 complicates 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 Signed-off-by: Russell King (Oracle) --- drivers/irqchip/irq-gic-v3.c | 18 ++++++------------ 1 file changed, 6 insertions(+), 12 deletions(-) diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c index d50d9414f471..e787e7bbb5a2 100644 --- a/drivers/irqchip/irq-gic-v3.c +++ b/drivers/irqchip/irq-gic-v3.c @@ -2428,21 +2428,15 @@ 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 + * GICR base is presented via GICC. The redistributor is only known to + * be accessible if the GICC is marked as enabled. If this bit is not + * set, we'd need to add the redistributor at runtime, which isn't + * supported. */ - if (acpi_gicc_is_usable(gicc) && gicc->gicr_base_address) { + if (gicc->flags & ACPI_MADT_ENABLED && 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)