From patchwork Fri Jun 11 15:26:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claire Chang X-Patchwork-Id: 12316021 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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 B3C1DC48BE0 for ; Fri, 11 Jun 2021 15:28:17 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 818DB61400 for ; Fri, 11 Jun 2021 15:28:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 818DB61400 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 1ECC06EF2E; Fri, 11 Jun 2021 15:28:17 +0000 (UTC) Received: from mail-pg1-x52b.google.com (mail-pg1-x52b.google.com [IPv6:2607:f8b0:4864:20::52b]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0583D6E7D7 for ; Fri, 11 Jun 2021 15:28:16 +0000 (UTC) Received: by mail-pg1-x52b.google.com with SMTP id n12so2729313pgs.13 for ; Fri, 11 Jun 2021 08:28:16 -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=xr7PRB7Hd7uTEVi/Kqqr6QruQxC5reNs5RNxGaybH98=; b=YSZ4LEx/9RYLf/YKEG6tawzieyj/VAOpPCm5Fm982cDV6gY8FOWSj8Iha0Cw2ygemc 3I0c6r5KExTHw/LJYZsBJHzskVIqgxxuoNNap9FQ4XuW20PKiHcekGBx9346xteGvy0g PyEd4u9wNOBOko8Jf1JfFmLyPmRNUFV9L6mCY= 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=xr7PRB7Hd7uTEVi/Kqqr6QruQxC5reNs5RNxGaybH98=; b=HGgjIFLTDBoH1YiZoMzrv6jMozV4vTsgekz8Gj60+lBzDHK8QmoD0DThvEJ/6GnJOv +vXEc16ILXIvjnkyWNM5aKNnyAXWSATPI0QVJ9/RWasHjYMxn9Kg89goECih8BRQf6vx evCl28uEvBZTSoI/JYHVG7sr8DK5LxOkqxN3wj36JRckxW/ofRsp9S58lsvJxM/qWSQi rmWS+jydIOzR7LXBhFzmjX49eX4mVBtIc6sj58SNsvc8ctxl7zS9BC/7+/4SNFnXXgY7 Tab6QuYf/Q53j1l16iiQm8Nw7EgK51kCMq8Z3X4kdzZwJQBJOCmHmrc3V3RFSna9YQ5i pVbg== X-Gm-Message-State: AOAM533v4VVO8UM2jPeALOM2xI06oEiR0ZwZ5bUVmhEFJ2IKRAcKpyaq 2iAkeSsIaQ2hPIhJsDzResIYyg== X-Google-Smtp-Source: ABdhPJxAymBN9XfurYEcX4Hnlqi/pyl7ilzdDB9Ga+mX+C72T/+t3ghcDjkBJ1DjqsKqJ9yREhHJyw== X-Received: by 2002:a62:2682:0:b029:2f4:e1cf:9575 with SMTP id m124-20020a6226820000b02902f4e1cf9575mr8860532pfm.51.1623425295638; Fri, 11 Jun 2021 08:28:15 -0700 (PDT) Received: from localhost ([2401:fa00:95:205:33c8:8e01:1161:6797]) by smtp.gmail.com with UTF8SMTPSA id e21sm5534829pjh.55.2021.06.11.08.28.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 11 Jun 2021 08:28:15 -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 Date: Fri, 11 Jun 2021 23:26:52 +0800 Message-Id: <20210611152659.2142983-8-tientzu@chromium.org> X-Mailer: git-send-email 2.32.0.272.g935e593368-goog In-Reply-To: <20210611152659.2142983-1-tientzu@chromium.org> References: <20210611152659.2142983-1-tientzu@chromium.org> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v9 07/14] swiotlb: Bounce data from/to restricted DMA pool if available X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: heikki.krogerus@linux.intel.com, thomas.hellstrom@linux.intel.com, peterz@infradead.org, benh@kernel.crashing.org, dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, grant.likely@arm.com, paulus@samba.org, mingo@kernel.org, jxgao@google.com, sstabellini@kernel.org, Saravana Kannan , xypron.glpk@gmx.de, "Rafael J . Wysocki" , Bartosz Golaszewski , bskeggs@redhat.com, linux-pci@vger.kernel.org, xen-devel@lists.xenproject.org, Thierry Reding , intel-gfx@lists.freedesktop.org, matthew.auld@intel.com, linux-devicetree , airlied@linux.ie, Robin Murphy , Nicolas Boichat , bhelgaas@google.com, tientzu@chromium.org, Dan Williams , Andy Shevchenko , Greg KH , Randy Dunlap , lkml , tfiga@chromium.org, "list@263.net:IOMMU DRIVERS" , Jim Quinlan , linuxppc-dev@lists.ozlabs.org, bauerman@linux.ibm.com Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" 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 | 10 +++++++++- kernel/dma/direct.c | 3 ++- kernel/dma/direct.h | 3 ++- kernel/dma/swiotlb.c | 1 + 4 files changed, 14 insertions(+), 3 deletions(-) diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index 06cf17a80f5c..8200c100fe10 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -85,6 +85,7 @@ extern enum swiotlb_force swiotlb_force; * unmap calls. * @debugfs: The dentry to debugfs. * @late_alloc: %true if allocated using the page allocator + * @force_swiotlb: %true if swiotlb is forced */ struct io_tlb_mem { phys_addr_t start; @@ -95,6 +96,7 @@ struct io_tlb_mem { spinlock_t lock; struct dentry *debugfs; bool late_alloc; + bool force_swiotlb; struct io_tlb_slot { phys_addr_t orig_addr; size_t alloc_size; @@ -115,6 +117,11 @@ static inline void swiotlb_set_io_tlb_default_mem(struct device *dev) dev->dma_io_tlb_mem = io_tlb_default_mem; } +static inline bool is_dev_swiotlb_force(struct device *dev) +{ + return dev->dma_io_tlb_mem->force_swiotlb; +} + void __init swiotlb_exit(void); unsigned int swiotlb_max_segment(void); size_t swiotlb_max_mapping_size(struct device *dev); @@ -126,8 +133,9 @@ static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr) { return false; } -static inline void swiotlb_set_io_tlb_default_mem(struct device *dev) +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 21e99907edd6..e5ccc198d0a7 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -714,6 +714,7 @@ static int rmem_swiotlb_device_init(struct reserved_mem *rmem, return -ENOMEM; swiotlb_init_io_tlb_mem(mem, rmem->base, nslabs, false, true); + mem->force_swiotlb = true; rmem->priv = mem;