From patchwork Mon May 10 09:50:19 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claire Chang X-Patchwork-Id: 12247383 X-Patchwork-Delegate: bhelgaas@google.com 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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 48C0CC43460 for ; Mon, 10 May 2021 09:52:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 16722610CC for ; Mon, 10 May 2021 09:52:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230373AbhEJJxS (ORCPT ); Mon, 10 May 2021 05:53:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58088 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231166AbhEJJxD (ORCPT ); Mon, 10 May 2021 05:53:03 -0400 Received: from mail-pj1-x1035.google.com (mail-pj1-x1035.google.com [IPv6:2607:f8b0:4864:20::1035]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7069BC061359 for ; Mon, 10 May 2021 02:51:49 -0700 (PDT) Received: by mail-pj1-x1035.google.com with SMTP id lj11-20020a17090b344bb029015bc3073608so9989372pjb.3 for ; Mon, 10 May 2021 02:51:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=01kC5VD+dD2b0OOexB3kVYJ/sTlgIQPUcrnnVCwnvhY=; b=lgBDGiALZJWoTMGClwt7gAfCf14fepwM0lhs1vHuCCfVO5wyRcvJle6S59iBD1WHjw VcpIItr7I/JDG2KUPkhdMWHWpmui21OOXJ9ngFwe6+SQwXm1Lr/pV+cfahxnBOMneB9Q gdKX6Ey7xAgGLsyJX9bor8s5uFP/awnm9jDNw= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=01kC5VD+dD2b0OOexB3kVYJ/sTlgIQPUcrnnVCwnvhY=; b=mf7cQ15KmyjgYE4tn11SQtjyVr1ifky8/M/1wzNaX8jiT9dG7WOnNvW/z1uTfV0M/1 8wz4udW8O0M6Basmrdb581YTs0A6enDZojytYz5OQmFBIKGEwvJmxctrQ2Xkk4MsE/JG HYO4hEJ7X326EdutSCNyCifYpYS97qU1UtZA/PmZAnClhUux9+aQ+jmjj8gMQgvQ5gPa x4JYY8GG0etAY9nPcePxtWhmqKjhcyt9cDcPqMa50MS6C5WFhVth2/AsrK+Wbiuxkijt 9DfZhUsYdMplCEz78rACWiSqRCHj9PFhmxvHauTpVydUfX7wjFaou97nnneoM0UWpVdY r/VA== X-Gm-Message-State: AOAM532cjwLhOKn2LdiAlNt8gF2E+xsih0t3Ls57JmZY7TEjNJoSh2pL bTogEAlOv8hJ5cXUE9GrgL93yQ== X-Google-Smtp-Source: ABdhPJye9uoE8lM9qdQ85PwqQIVeAFlLuKjevIwDP1Nhkih9+NHBUgn/S+CAWbVadnjMg7MY4s3LVA== X-Received: by 2002:a17:90b:3551:: with SMTP id lt17mr26991167pjb.92.1620640309019; Mon, 10 May 2021 02:51:49 -0700 (PDT) Received: from localhost ([2401:fa00:95:205:a524:abe8:94e3:5601]) by smtp.gmail.com with UTF8SMTPSA id s64sm6702432pfs.3.2021.05.10.02.51.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 May 2021 02:51:48 -0700 (PDT) From: Claire Chang To: Rob Herring , mpe@ellerman.id.au, Joerg Roedel , Will Deacon , Frank Rowand , Konrad Rzeszutek Wilk , boris.ostrovsky@oracle.com, jgross@suse.com, Christoph Hellwig , Marek Szyprowski Cc: benh@kernel.crashing.org, paulus@samba.org, "list@263.net:IOMMU DRIVERS" , sstabellini@kernel.org, Robin Murphy , grant.likely@arm.com, xypron.glpk@gmx.de, Thierry Reding , mingo@kernel.org, bauerman@linux.ibm.com, peterz@infradead.org, Greg KH , Saravana Kannan , "Rafael J . Wysocki" , heikki.krogerus@linux.intel.com, Andy Shevchenko , Randy Dunlap , Dan Williams , Bartosz Golaszewski , linux-devicetree , lkml , linuxppc-dev@lists.ozlabs.org, xen-devel@lists.xenproject.org, Nicolas Boichat , Jim Quinlan , tfiga@chromium.org, bskeggs@redhat.com, bhelgaas@google.com, chris@chris-wilson.co.uk, tientzu@chromium.org, daniel@ffwll.ch, airlied@linux.ie, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, jani.nikula@linux.intel.com, jxgao@google.com, joonas.lahtinen@linux.intel.com, linux-pci@vger.kernel.org, maarten.lankhorst@linux.intel.com, matthew.auld@intel.com, nouveau@lists.freedesktop.org, rodrigo.vivi@intel.com, thomas.hellstrom@linux.intel.com Subject: [PATCH v6 08/15] swiotlb: Bounce data from/to restricted DMA pool if available Date: Mon, 10 May 2021 17:50:19 +0800 Message-Id: <20210510095026.3477496-9-tientzu@chromium.org> X-Mailer: git-send-email 2.31.1.607.g51e8a6a459-goog In-Reply-To: <20210510095026.3477496-1-tientzu@chromium.org> References: <20210510095026.3477496-1-tientzu@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Regardless of swiotlb setting, the restricted DMA pool is preferred if available. The restricted DMA pools provide a basic level of protection against the DMA overwriting buffer contents at unexpected times. However, to protect against general data leakage and system memory corruption, the system needs to provide a way to lock down the memory access, e.g., MPU. Note that is_dev_swiotlb_force doesn't check if swiotlb_force == SWIOTLB_FORCE. Otherwise the memory allocation behavior with default swiotlb will be changed by the following patche ("dma-direct: Allocate memory from restricted DMA pool if available"). Signed-off-by: Claire Chang --- include/linux/swiotlb.h | 13 +++++++++++++ kernel/dma/direct.c | 3 ++- kernel/dma/direct.h | 3 ++- kernel/dma/swiotlb.c | 8 ++++---- 4 files changed, 21 insertions(+), 6 deletions(-) diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index c530c976d18b..0c5a18d9cf89 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -120,6 +120,15 @@ static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr) return mem && paddr >= mem->start && paddr < mem->end; } +static inline bool is_dev_swiotlb_force(struct device *dev) +{ +#ifdef CONFIG_DMA_RESTRICTED_POOL + if (dev->dma_io_tlb_mem) + return true; +#endif /* CONFIG_DMA_RESTRICTED_POOL */ + return false; +} + void __init swiotlb_exit(void); unsigned int swiotlb_max_segment(void); size_t swiotlb_max_mapping_size(struct device *dev); @@ -131,6 +140,10 @@ static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr) { return false; } +static inline bool is_dev_swiotlb_force(struct device *dev) +{ + return false; +} static inline void swiotlb_exit(void) { } diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index 7a88c34d0867..078f7087e466 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -496,7 +496,8 @@ size_t dma_direct_max_mapping_size(struct device *dev) { /* If SWIOTLB is active, use its maximum mapping size */ if (is_swiotlb_active(dev) && - (dma_addressing_limited(dev) || swiotlb_force == SWIOTLB_FORCE)) + (dma_addressing_limited(dev) || swiotlb_force == SWIOTLB_FORCE || + is_dev_swiotlb_force(dev))) return swiotlb_max_mapping_size(dev); return SIZE_MAX; } diff --git a/kernel/dma/direct.h b/kernel/dma/direct.h index 13e9e7158d94..f94813674e23 100644 --- a/kernel/dma/direct.h +++ b/kernel/dma/direct.h @@ -87,7 +87,8 @@ static inline dma_addr_t dma_direct_map_page(struct device *dev, phys_addr_t phys = page_to_phys(page) + offset; dma_addr_t dma_addr = phys_to_dma(dev, phys); - if (unlikely(swiotlb_force == SWIOTLB_FORCE)) + if (unlikely(swiotlb_force == SWIOTLB_FORCE) || + is_dev_swiotlb_force(dev)) return swiotlb_map(dev, phys, size, dir, attrs); if (unlikely(!dma_capable(dev, dma_addr, size, true))) { diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index 81bed3d2c771..3f1ad080a4bc 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -347,7 +347,7 @@ void __init swiotlb_exit(void) static void swiotlb_bounce(struct device *dev, phys_addr_t tlb_addr, size_t size, enum dma_data_direction dir) { - struct io_tlb_mem *mem = io_tlb_default_mem; + struct io_tlb_mem *mem = get_io_tlb_mem(dev); int index = (tlb_addr - mem->start) >> IO_TLB_SHIFT; phys_addr_t orig_addr = mem->slots[index].orig_addr; size_t alloc_size = mem->slots[index].alloc_size; @@ -429,7 +429,7 @@ static unsigned int wrap_index(struct io_tlb_mem *mem, unsigned int index) static int find_slots(struct device *dev, phys_addr_t orig_addr, size_t alloc_size) { - struct io_tlb_mem *mem = io_tlb_default_mem; + struct io_tlb_mem *mem = get_io_tlb_mem(dev); unsigned long boundary_mask = dma_get_seg_boundary(dev); dma_addr_t tbl_dma_addr = phys_to_dma_unencrypted(dev, mem->start) & boundary_mask; @@ -506,7 +506,7 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr, size_t mapping_size, size_t alloc_size, enum dma_data_direction dir, unsigned long attrs) { - struct io_tlb_mem *mem = io_tlb_default_mem; + struct io_tlb_mem *mem = get_io_tlb_mem(dev); unsigned int offset = swiotlb_align_offset(dev, orig_addr); unsigned int i; int index; @@ -557,7 +557,7 @@ void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr, size_t mapping_size, enum dma_data_direction dir, unsigned long attrs) { - struct io_tlb_mem *mem = io_tlb_default_mem; + struct io_tlb_mem *mem = get_io_tlb_mem(hwdev); unsigned long flags; unsigned int offset = swiotlb_align_offset(hwdev, tlb_addr); int index = (tlb_addr - offset - mem->start) >> IO_TLB_SHIFT;