From patchwork Fri Sep 13 11:48:37 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Robin Murphy X-Patchwork-Id: 11144413 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 882FC1395 for ; Fri, 13 Sep 2019 11:48:56 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 656EF20830 for ; Fri, 13 Sep 2019 11:48:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="je3l7A3P" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 656EF20830 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:To :From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=O+es3a+lN2yPbanPkEtR+9e4NKyVuM/dM6bW2eNwEy4=; b=je3l7A3PgFRA5u sso0E1BeEl/Se4Ld4U983vvHEl1EgNMyf7QgjomqmEAK4G8TNW7cVKM3gR0w576N04Kja44mfqvMs 7jWVVvrYw1XU0F/maNPajD9TzFg3OEnxG7l2TJrixHBeZwKs+wRPvg4EbG8gGC1VRPgJrfGMHejxC uvdyrMwJbsVLifCbOWE+iq+Pl3UQrXYjFp4zjuGLoAb3zbmqToFrSsNw9JNZeXtKFTfUpn7LpYAjJ AQ4PWn9V8YN/UilRZF5/RE4pU+bVVuASpcH82HwxZZop/CohABoiINl3WRVyDEyb3kABpERvZGwjw 3wEQ5qIKrm8iY940DRnQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.2 #3 (Red Hat Linux)) id 1i8k4I-0006nh-It; Fri, 13 Sep 2019 11:48:50 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.2 #3 (Red Hat Linux)) id 1i8k4F-0006nI-NM for linux-arm-kernel@lists.infradead.org; Fri, 13 Sep 2019 11:48:48 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 76D0128; Fri, 13 Sep 2019 04:48:43 -0700 (PDT) Received: from e110467-lin.cambridge.arm.com (e110467-lin.cambridge.arm.com [10.1.197.57]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id A93D23F71F; Fri, 13 Sep 2019 04:48:42 -0700 (PDT) From: Robin Murphy To: will@kernel.org, joro@8bytes.org Subject: [PATCH] iommu/arm-smmu: Report USF more clearly Date: Fri, 13 Sep 2019 12:48:37 +0100 Message-Id: <2762ffd4c196dc91d62e10eb8b753f256ea9b629.1568375317.git.robin.murphy@arm.com> X-Mailer: git-send-email 2.21.0.dirty MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190913_044847_798181_AE0194D3 X-CRM114-Status: GOOD ( 10.82 ) X-Spam-Score: 0.0 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (0.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: iommu@lists.linux-foundation.org, Douglas Anderson , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Although CONFIG_ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT is a welcome tool for smoking out inadequate firmware, the failure mode is non-obvious and can be confusing for end users. Add some special-case reporting of Unidentified Stream Faults to help clarify this particular symptom. CC: Douglas Anderson Signed-off-by: Robin Murphy --- drivers/iommu/arm-smmu.c | 5 +++++ drivers/iommu/arm-smmu.h | 2 ++ 2 files changed, 7 insertions(+) diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index b7cf24402a94..76ac8c180695 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -499,6 +499,11 @@ static irqreturn_t arm_smmu_global_fault(int irq, void *dev) dev_err_ratelimited(smmu->dev, "\tGFSR 0x%08x, GFSYNR0 0x%08x, GFSYNR1 0x%08x, GFSYNR2 0x%08x\n", gfsr, gfsynr0, gfsynr1, gfsynr2); + if (IS_ENABLED(CONFIG_ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT) && + (gfsr & sGFSR_USF)) + dev_err_ratelimited(smmu->dev, + "Stream ID %hu may not be described by firmware, try booting with \"arm-smmu.disable_bypass=0\"\n", + (u16)gfsynr1); arm_smmu_gr0_write(smmu, ARM_SMMU_GR0_sGFSR, gfsr); return IRQ_HANDLED; diff --git a/drivers/iommu/arm-smmu.h b/drivers/iommu/arm-smmu.h index c9c13b5785f2..46f7e161e83e 100644 --- a/drivers/iommu/arm-smmu.h +++ b/drivers/iommu/arm-smmu.h @@ -79,6 +79,8 @@ #define ID7_MINOR GENMASK(3, 0) #define ARM_SMMU_GR0_sGFSR 0x48 +#define sGFSR_USF BIT(2) + #define ARM_SMMU_GR0_sGFSYNR0 0x50 #define ARM_SMMU_GR0_sGFSYNR1 0x54 #define ARM_SMMU_GR0_sGFSYNR2 0x58