From patchwork Fri Sep 14 14:30:21 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Robin Murphy X-Patchwork-Id: 10600833 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 63868933 for ; Fri, 14 Sep 2018 14:32:29 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 440712B86C for ; Fri, 14 Sep 2018 14:32:29 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 380252B8A3; Fri, 14 Sep 2018 14:32:29 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id A7F122B86C for ; Fri, 14 Sep 2018 14:32:27 +0000 (UTC) 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:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=xm4mT5pvP8tCcTotlKEiq+swN7ED5qUuWX1VB7Sa42E=; b=kn012sbTYSmItc c9KsS73RqIc+86MGI4ScU4SlxpxU0RAfts88Vn+Fa3zb64WvtDKEYN/gAQRu57uI+aqqWGGGLl2cC 1Ko3q29/31VctxF2dQ1SI++6axVMsy9gZACMv3Vaw7laG19WDb9OeszqDyKeIhNlDugu2jJvJfNs9 o5XGe84cPTIus+qwIsry3/GRYZEvC9bCrC8KAIyQiabSSKchbMgCJP1VnGLlAN2dDiVvqNrOE71YQ dG10XYletninCkepcja6lG+vdWc8+uQgaJSbZPF95h/l/FqOdS7ad7/DJJeXEURPXYaGcclsiNZDS S8xkNcs7u3eEFjPizRJA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1g0p8l-0004Me-AD; Fri, 14 Sep 2018 14:32:11 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1g0p7I-0003lE-IM for linux-arm-kernel@lists.infradead.org; Fri, 14 Sep 2018 14:30:44 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 159B915BE; Fri, 14 Sep 2018 07:30:39 -0700 (PDT) Received: from e110467-lin.cambridge.arm.com (e110467-lin.emea.arm.com [10.4.12.131]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 4B94E3F575; Fri, 14 Sep 2018 07:30:37 -0700 (PDT) From: Robin Murphy To: joro@8bytes.org, will.deacon@arm.com, thunder.leizhen@huawei.com, iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v7 3/6] iommu/io-pgtable-arm: Add support for non-strict mode Date: Fri, 14 Sep 2018 15:30:21 +0100 Message-Id: <75c1c1f9e8bc2fb9f199be5d3aef041a92d30160.1536935328.git.robin.murphy@arm.com> X-Mailer: git-send-email 2.19.0.dirty In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180914_073040_652459_B548BD4F X-CRM114-Status: GOOD ( 16.11 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: john.garry@huawei.com, linuxarm@huawei.com, huawei.libin@huawei.com, guohanjun@huawei.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Zhen Lei To support non-strict mode, now we only TLBI and sync for strict mode, except for non-leaf invalidations since page table updates themselves must always be synchronous. To save having to reason about it too much, make sure the invalidation in arm_lpae_split_blk_unmap() just performs its own unconditional sync to minimise the window in which we're technically violating the break- before-make requirement on a live mapping. This might work out redundant with an outer-level sync for strict unmaps, but we'll never be splitting blocks on a DMA fastpath anyway. Signed-off-by: Zhen Lei [rm: tweak comment, commit message, and split_blk_unmap logic] Signed-off-by: Robin Murphy --- drivers/iommu/io-pgtable-arm.c | 9 ++++++--- drivers/iommu/io-pgtable.h | 5 +++++ 2 files changed, 11 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index 2f79efd16a05..5b915aab7fd3 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -576,6 +576,7 @@ static size_t arm_lpae_split_blk_unmap(struct arm_lpae_io_pgtable *data, tablep = iopte_deref(pte, data); } else if (unmap_idx >= 0) { io_pgtable_tlb_add_flush(&data->iop, iova, size, size, true); + io_pgtable_tlb_sync(&data->iop); return size; } @@ -609,7 +610,7 @@ static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data, io_pgtable_tlb_sync(iop); ptep = iopte_deref(pte, data); __arm_lpae_free_pgtable(data, lvl + 1, ptep); - } else { + } else if (!(iop->cfg.quirks & IO_PGTABLE_QUIRK_NON_STRICT)) { io_pgtable_tlb_add_flush(iop, iova, size, size, true); } @@ -771,7 +772,8 @@ arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie) u64 reg; struct arm_lpae_io_pgtable *data; - if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS | IO_PGTABLE_QUIRK_NO_DMA)) + if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS | IO_PGTABLE_QUIRK_NO_DMA | + IO_PGTABLE_QUIRK_NON_STRICT)) return NULL; data = arm_lpae_alloc_pgtable(cfg); @@ -863,7 +865,8 @@ arm_64_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie) struct arm_lpae_io_pgtable *data; /* The NS quirk doesn't apply at stage 2 */ - if (cfg->quirks & ~IO_PGTABLE_QUIRK_NO_DMA) + if (cfg->quirks & ~(IO_PGTABLE_QUIRK_NO_DMA | + IO_PGTABLE_QUIRK_NON_STRICT)) return NULL; data = arm_lpae_alloc_pgtable(cfg); diff --git a/drivers/iommu/io-pgtable.h b/drivers/iommu/io-pgtable.h index 2df79093cad9..47d5ae559329 100644 --- a/drivers/iommu/io-pgtable.h +++ b/drivers/iommu/io-pgtable.h @@ -71,12 +71,17 @@ struct io_pgtable_cfg { * be accessed by a fully cache-coherent IOMMU or CPU (e.g. for a * software-emulated IOMMU), such that pagetable updates need not * be treated as explicit DMA data. + * + * IO_PGTABLE_QUIRK_NON_STRICT: Skip issuing synchronous leaf TLBIs + * on unmap, for DMA domains using the flush queue mechanism for + * delayed invalidation. */ #define IO_PGTABLE_QUIRK_ARM_NS BIT(0) #define IO_PGTABLE_QUIRK_NO_PERMS BIT(1) #define IO_PGTABLE_QUIRK_TLBI_ON_MAP BIT(2) #define IO_PGTABLE_QUIRK_ARM_MTK_4GB BIT(3) #define IO_PGTABLE_QUIRK_NO_DMA BIT(4) + #define IO_PGTABLE_QUIRK_NON_STRICT BIT(5) unsigned long quirks; unsigned long pgsize_bitmap; unsigned int ias;