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 X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4CD34C4724C for ; Thu, 30 Apr 2020 21:13:59 +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 15AAF2072A for ; Thu, 30 Apr 2020 21:13:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="CsnNO+H1" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 15AAF2072A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.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:References:In-Reply-To: Message-ID:Subject: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=W0tWyZdVsf/k9bu0bLneWbM6LD+czJFJsoItnqDjndQ=; b=CsnNO+H1GFNTmX zGjXPgYoJXosqn9gdqpW6ADUFDIijICGlSwaSOLdrWDDac5PoKz1Vnz9ig4usx8LU30l9JlZPcnkB wL0fK4aijety/dnUcdwL5HCFgpS0i5/TWFSdYFqUZ8L08qrF/+B6e6ASrW+jk125q5OmbHR9zIGvg y193Pac+B+Eq1Lu/XWvLRww4hCrLvWKph/GtnDIr2gl89O4A4pHkqhT3mBoGuufwc2+meAupIjt+R TBN41TaiyTEeJEqIBM6P25vjRRf1l7CvbHZxV+Ty55FEdaXDGvW6FQiGu8rWDM97dEFt3mQa1d3RR dEwSHgpXPIxyLqXnakSA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jUGVJ-0006KS-V7; Thu, 30 Apr 2020 21:13:57 +0000 Received: from mga17.intel.com ([192.55.52.151]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jUGTf-0004sy-RL for linux-arm-kernel@lists.infradead.org; Thu, 30 Apr 2020 21:12:18 +0000 IronPort-SDR: GD+T4JA1Rzxxt2/Re5h2Tw6oDBJk8zw/PUXiFq+V0EUaSrmXHq2ypb8kpZg9qSDwK0Caq8EFf8 zWg04oGaWCBw== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Apr 2020 14:12:13 -0700 IronPort-SDR: LVHsRMgJ7GdSWX064ocXY72QKgePGf1G+/dA+XVa/E+wyPTuvCryaG2DXe8fDKuW9WtKlwUhjb MeYme43Pk+/A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,337,1583222400"; d="scan'208";a="460080601" Received: from jacob-builder.jf.intel.com (HELO jacob-builder) ([10.7.199.155]) by fmsmga006.fm.intel.com with ESMTP; 30 Apr 2020 14:12:13 -0700 Date: Thu, 30 Apr 2020 14:18:16 -0700 From: Jacob Pan To: Jean-Philippe Brucker Subject: Re: [PATCH v6 00/25] iommu: Shared Virtual Addressing for SMMUv3 Message-ID: <20200430141816.595b758f@jacob-builder> In-Reply-To: <20200430143424.2787566-1-jean-philippe@linaro.org> References: <20200430143424.2787566-1-jean-philippe@linaro.org> Organization: OTC X-Mailer: Claws Mail 3.13.2 (GTK+ 2.24.30; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200430_141216_232073_240AD9D8 X-CRM114-Status: GOOD ( 19.39 ) 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: devicetree@vger.kernel.org, kevin.tian@intel.com, jacob.jun.pan@linux.intel.com, jgg@ziepe.ca, linux-pci@vger.kernel.org, joro@8bytes.org, Jonathan.Cameron@huawei.com, robin.murphy@arm.com, fenghua.yu@intel.com, hch@infradead.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, zhangfei.gao@linaro.org, "Liu, Yi L" , catalin.marinas@arm.com, felix.kuehling@amd.com, xuzaibo@huawei.com, will@kernel.org, christian.koenig@amd.com, linux-arm-kernel@lists.infradead.org, baolu.lu@linux.intel.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, 30 Apr 2020 16:33:59 +0200 Jean-Philippe Brucker wrote: > Shared Virtual Addressing (SVA) allows to share process page tables > with devices using the IOMMU, PASIDs and I/O page faults. Add SVA > support to the Arm SMMUv3 driver. > > Since v5 [1]: > > * Added patches 1-3. Patch 1 adds a PASID field to mm_struct as > discussed in [1] and [2]. This is also needed for Intel ENQCMD. > Patch 2 adds refcounts to IOASID and patch 3 adds a couple of helpers > to allocate the PASID. > > * Dropped most of iommu-sva.c. After getting rid of io_mm following > review of v5, there wasn't enough generic code left to justify the > indirect branch overhead of io_mm_ops in the MMU notifiers. I ended > up with more glue than useful code, and couldn't find an easy way to > deal with domains in the SMMU driver (we keep PASID tables per domain, > while x86 keeps them per device). The direct approach in patch 17 is > nicer and a little easier to read. The SMMU driver only gained 160 > lines, while iommu-sva lost 470 lines. > > As a result I dropped the MMU notifier patch. > > Jacob, one upside of this rework is that we now free ioasids in > blocking context, which might help with your addition of notifiers > to ioasid.c > Thanks for the note. It does make notifier much easier, plus the refcount can alleviate the constraint on ordering. I guess we don't share mmu notifier code for now :) > * Simplified io-pgfault a bit, since flush() isn't called from mm exit > path anymore. > > * Fixed a bug in patch 17 (don't clear the stall bit when stall is > forced). > > You can find the latest version on https://jpbrucker.net/git/linux > branch sva/current, and sva/zip-devel for the Hisilicon zip > accelerator. > > [1] > https://lore.kernel.org/linux-iommu/20200414170252.714402-1-jean-philippe@linaro.org/ > [2] > https://lore.kernel.org/linux-iommu/1585596788-193989-6-git-send-email-fenghua.yu@intel.com/ > > Jean-Philippe Brucker (25): > mm: Add a PASID field to mm_struct > iommu/ioasid: Add ioasid references > iommu/sva: Add PASID helpers > iommu: Add a page fault handler > iommu/iopf: Handle mm faults > arm64: mm: Add asid_gen_match() helper > arm64: mm: Pin down ASIDs for sharing mm with devices > iommu/io-pgtable-arm: Move some definitions to a header > iommu/arm-smmu-v3: Manage ASIDs with xarray > arm64: cpufeature: Export symbol read_sanitised_ftr_reg() > iommu/arm-smmu-v3: Share process page tables > iommu/arm-smmu-v3: Seize private ASID > iommu/arm-smmu-v3: Add support for VHE > iommu/arm-smmu-v3: Enable broadcast TLB maintenance > iommu/arm-smmu-v3: Add SVA feature checking > iommu/arm-smmu-v3: Add SVA device feature > iommu/arm-smmu-v3: Implement iommu_sva_bind/unbind() > iommu/arm-smmu-v3: Hook up ATC invalidation to mm ops > iommu/arm-smmu-v3: Add support for Hardware Translation Table Update > iommu/arm-smmu-v3: Maintain a SID->device structure > dt-bindings: document stall property for IOMMU masters > iommu/arm-smmu-v3: Add stall support for platform devices > PCI/ATS: Add PRI stubs > PCI/ATS: Export PRI functions > iommu/arm-smmu-v3: Add support for PRI > > drivers/iommu/Kconfig | 11 + > drivers/iommu/Makefile | 2 + > .../devicetree/bindings/iommu/iommu.txt | 18 + > arch/arm64/include/asm/mmu.h | 1 + > arch/arm64/include/asm/mmu_context.h | 11 +- > drivers/iommu/io-pgtable-arm.h | 30 + > drivers/iommu/iommu-sva.h | 15 + > include/linux/ioasid.h | 10 +- > include/linux/iommu.h | 53 + > include/linux/mm_types.h | 4 + > include/linux/pci-ats.h | 8 + > arch/arm64/kernel/cpufeature.c | 1 + > arch/arm64/mm/context.c | 103 +- > drivers/iommu/arm-smmu-v3.c | 1554 > +++++++++++++++-- drivers/iommu/io-pgfault.c | > 458 +++++ drivers/iommu/io-pgtable-arm.c | 27 +- > drivers/iommu/ioasid.c | 30 +- > drivers/iommu/iommu-sva.c | 85 + > drivers/iommu/of_iommu.c | 5 +- > drivers/pci/ats.c | 4 + > MAINTAINERS | 3 +- > 21 files changed, 2275 insertions(+), 158 deletions(-) > create mode 100644 drivers/iommu/io-pgtable-arm.h > create mode 100644 drivers/iommu/iommu-sva.h > create mode 100644 drivers/iommu/io-pgfault.c > create mode 100644 drivers/iommu/iommu-sva.c > [Jacob Pan] _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel