From nobody Fri Dec 19 05:27:47 2025 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 B869EC04FDF for ; Wed, 2 Aug 2023 17:26:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231923AbjHBR0z (ORCPT ); Wed, 2 Aug 2023 13:26:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48334 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231775AbjHBR0k (ORCPT ); Wed, 2 Aug 2023 13:26:40 -0400 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 4EA9EED; Wed, 2 Aug 2023 10:26:38 -0700 (PDT) Received: from rrs24-12-35.corp.microsoft.com (unknown [131.107.147.181]) by linux.microsoft.com (Postfix) with ESMTPSA id 3699E238C435; Wed, 2 Aug 2023 10:26:37 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 3699E238C435 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1690997197; bh=3PXY2VvlT3nfYjchGavlVsenUShvn2PDaXDTz5PBuD8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Rn2fqLTjEYMoHG7DFqvKpcXxjYsOzxoX3NfV6f0HOduUjNBrdgwpZO+umLnKGdUkW +uPxawVtV+SEqzPQP4rUgh/ds4wgonPIJhAiVPfmbBPnQyrcNW1Ax37w+sLUNShsHx XU6nDF5UyHIKMOGL0gxMqeIMhaQjFElpy2ee2DXs= From: Easwar Hariharan To: stable@vger.kernel.org Cc: easwar.hariharan@microsoft.com, Robin Murphy , Nicolin Chen , Will Deacon , Catalin Marinas , Jonathan Corbet , Joerg Roedel , Lu Baolu , Jason Gunthorpe , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Jean-Philippe Brucker , Yicong Yang , Tomas Krcka , "Kirill A. Shutemov" , linux-arm-kernel@lists.infradead.org (moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)), linux-doc@vger.kernel.org (open list:DOCUMENTATION), linux-kernel@vger.kernel.org (open list), iommu@lists.linux.dev (open list:IOMMU SUBSYSTEM) Subject: [PATCH v2 6.4 2/4] iommu/arm-smmu-v3: Document MMU-700 erratum 2812531 Date: Wed, 2 Aug 2023 17:26:18 +0000 Message-Id: <20230802172620.1628017-3-eahariha@linux.microsoft.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230802172620.1628017-1-eahariha@linux.microsoft.com> References: <20230802172620.1628017-1-eahariha@linux.microsoft.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Robin Murphy commit 309a15cb16bb075da1c99d46fb457db6a1a2669e upstream To work around MMU-700 erratum 2812531 we need to ensure that certain sequences of commands cannot be issued without an intervening sync. In practice this falls out of our current command-batching machinery anyway - each batch only contains a single type of invalidation command, and ends with a sync. The only exception is when a batch is sufficiently large to need issuing across multiple command queue slots, wherein the earlier slots will not contain a sync and thus may in theory interleave with another batch being issued in parallel to create an affected sequence across the slot boundary. Since MMU-700 supports range invalidate commands and thus we will prefer to use them (which also happens to avoid conditions for other errata), I'm not entirely sure it's even possible for a single high-level invalidate call to generate a batch of more than 63 commands, but for the sake of robustness and documentation, wire up an option to enforce that a sync is always inserted for every slot issued. The other aspect is that the relative order of DVM commands cannot be controlled, so DVM cannot be used. Again that is already the status quo, but since we have at least defined ARM_SMMU_FEAT_BTM, we can explicitly disable it for documentation purposes even if it's not wired up anywhere yet. Signed-off-by: Robin Murphy Reviewed-by: Nicolin Chen Link: https://lore.kernel.org/r/330221cdfd0003cd51b6c04e7ff3566741ad8374.16= 83731256.git.robin.murphy@arm.com Signed-off-by: Will Deacon Signed-off-by: Easwar Hariharan --- Documentation/arm64/silicon-errata.rst | 2 ++ drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 12 ++++++++++++ drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 1 + 3 files changed, 15 insertions(+) diff --git a/Documentation/arm64/silicon-errata.rst b/Documentation/arm64/s= ilicon-errata.rst index fd0d60827b08..b0346968765d 100644 --- a/Documentation/arm64/silicon-errata.rst +++ b/Documentation/arm64/silicon-errata.rst @@ -145,6 +145,8 @@ stable kernels. +----------------+-----------------+-----------------+--------------------= ---------+ | ARM | MMU-600 | #1076982 | N/A = | +----------------+-----------------+-----------------+--------------------= ---------+ +| ARM | MMU-700 | #2812531 | N/A = | ++----------------+-----------------+-----------------+--------------------= ---------+ +----------------+-----------------+-----------------+--------------------= ---------+ | Broadcom | Brahma-B53 | N/A | ARM64_ERRATUM_84571= 9 | +----------------+-----------------+-----------------+--------------------= ---------+ diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/ar= m/arm-smmu-v3/arm-smmu-v3.c index 667e7a90706e..b0ccd735f8bb 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -894,6 +894,12 @@ static void arm_smmu_cmdq_batch_add(struct arm_smmu_de= vice *smmu, { int index; =20 + if (cmds->num =3D=3D CMDQ_BATCH_ENTRIES - 1 && + (smmu->options & ARM_SMMU_OPT_CMDQ_FORCE_SYNC)) { + arm_smmu_cmdq_issue_cmdlist(smmu, cmds->cmds, cmds->num, true); + cmds->num =3D 0; + } + if (cmds->num =3D=3D CMDQ_BATCH_ENTRIES) { arm_smmu_cmdq_issue_cmdlist(smmu, cmds->cmds, cmds->num, false); cmds->num =3D 0; @@ -3431,6 +3437,7 @@ static int arm_smmu_device_reset(struct arm_smmu_devi= ce *smmu, bool bypass) =20 #define IIDR_IMPLEMENTER_ARM 0x43b #define IIDR_PRODUCTID_ARM_MMU_600 0x483 +#define IIDR_PRODUCTID_ARM_MMU_700 0x487 =20 static void arm_smmu_device_iidr_probe(struct arm_smmu_device *smmu) { @@ -3451,6 +3458,11 @@ static void arm_smmu_device_iidr_probe(struct arm_sm= mu_device *smmu) if (variant =3D=3D 0 && revision <=3D 2) smmu->features &=3D ~ARM_SMMU_FEAT_SEV; break; + case IIDR_PRODUCTID_ARM_MMU_700: + /* Arm erratum 2812531 */ + smmu->features &=3D ~ARM_SMMU_FEAT_BTM; + smmu->options |=3D ARM_SMMU_OPT_CMDQ_FORCE_SYNC; + break; } break; } diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/ar= m/arm-smmu-v3/arm-smmu-v3.h index 5ce47f2e3402..1555c8220381 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h @@ -650,6 +650,7 @@ struct arm_smmu_device { #define ARM_SMMU_OPT_SKIP_PREFETCH (1 << 0) #define ARM_SMMU_OPT_PAGE0_REGS_ONLY (1 << 1) #define ARM_SMMU_OPT_MSIPOLL (1 << 2) +#define ARM_SMMU_OPT_CMDQ_FORCE_SYNC (1 << 3) u32 options; =20 struct arm_smmu_cmdq cmdq; --=20 2.25.1