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=-19.3 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, URIBL_BLOCKED,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 0A1D5C433DB for ; Tue, 9 Feb 2021 06:23:22 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 BBD3C64E54 for ; Tue, 9 Feb 2021 06:23:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BBD3C64E54 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.83138.154095 (Exim 4.92) (envelope-from ) id 1l9MQb-0003BG-Lh; Tue, 09 Feb 2021 06:23:13 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 83138.154095; Tue, 09 Feb 2021 06:23:13 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1l9MQb-0003B8-Fe; Tue, 09 Feb 2021 06:23:13 +0000 Received: by outflank-mailman (input) for mailman id 83138; Tue, 09 Feb 2021 06:23:11 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1l9MQZ-0003A2-RH for xen-devel@lists.xenproject.org; Tue, 09 Feb 2021 06:23:11 +0000 Received: from mail-pl1-x630.google.com (unknown [2607:f8b0:4864:20::630]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 1684ab7b-4ba4-4df0-8dab-bc81045a7a5d; Tue, 09 Feb 2021 06:23:10 +0000 (UTC) Received: by mail-pl1-x630.google.com with SMTP id u11so9151602plg.13 for ; Mon, 08 Feb 2021 22:23:10 -0800 (PST) Received: from localhost ([2401:fa00:1:10:a106:46e1:a999:81df]) by smtp.gmail.com with UTF8SMTPSA id p12sm1179850pju.35.2021.02.08.22.23.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 08 Feb 2021 22:23:09 -0800 (PST) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 1684ab7b-4ba4-4df0-8dab-bc81045a7a5d 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=vHso+1dmoTPyqg/ZF0QCJG3XeyxPCOLU98naLUieJmU=; b=QwHj1zYjx8/U4T+NrsaexKnUNeJz6V3FI8pfT++P1AguN4L2+bwgyhZpJV9bSAwRQa twEx8bTmtbIBs2lxyKwlCbga0ygDkQ0nQZXX5ABNhH9W7/F1oNHJLy6ve5KSFZapowUH 93XaB33tmsf953SSQYHK0jmBpqLV34Qb65Vhc= 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=vHso+1dmoTPyqg/ZF0QCJG3XeyxPCOLU98naLUieJmU=; b=s+BuOTYxAARBjquq9nUa+i9tsObzOFzBHMmzmjzQZAnpRZFBIDMIgs7f94IsxDk1uu aKmGZPzZh6TVsef7Fhmocb28CM/j88XD0EnN6S767uNl0PO94dKSj2cv6IuWVGo5O2dK mLuTLf+d2uczd1nQZscH5GRhuHAOvg+obZiGv7Lw+X/36JNyyzCJdGz+T/mbbycmtMa1 yB4BnwU1k84V6bhVqKG28yzYFySYsHgKztFdPvqhdy8yn27GWO9Fvs9rWIc2/Y0zU2FX sTViTiS1HibX3hRWlkBd/DYrAX1r6haGGHPfg8ly7OVdAA48eX6OqJh+iACoNe2qVEkD LW8w== X-Gm-Message-State: AOAM532YrlcmVaF2YvHvLltpd6nwgD7rjdCDiQGlZKKWM7BEZRNEs6T1 2qFjHtkvUBT9xqnPWh55id4EvA== X-Google-Smtp-Source: ABdhPJxWN5Jg96v3iIqbJoN9yhUIoNv8pB4+CsEk+MHaFgKY0zVKfDlN6kq7qCIcEpJ1CyA9UerivQ== X-Received: by 2002:a17:90a:c82:: with SMTP id v2mr2529855pja.171.1612851790238; Mon, 08 Feb 2021 22:23:10 -0800 (PST) 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 , Claire Chang Subject: [PATCH v4 12/14] swiotlb: Add restricted DMA alloc/free support. Date: Tue, 9 Feb 2021 14:21:29 +0800 Message-Id: <20210209062131.2300005-13-tientzu@chromium.org> X-Mailer: git-send-email 2.30.0.478.g8a0d178c01-goog In-Reply-To: <20210209062131.2300005-1-tientzu@chromium.org> References: <20210209062131.2300005-1-tientzu@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add the functions, dev_swiotlb_{alloc,free} to support the memory allocation from restricted DMA pool. Signed-off-by: Claire Chang --- include/linux/swiotlb.h | 2 ++ kernel/dma/direct.c | 30 ++++++++++++++++++++++-------- kernel/dma/swiotlb.c | 34 ++++++++++++++++++++++++++++++++++ 3 files changed, 58 insertions(+), 8 deletions(-) diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index b9f2a250c8da..2cd39e102915 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -74,6 +74,8 @@ extern enum swiotlb_force swiotlb_force; #ifdef CONFIG_DMA_RESTRICTED_POOL bool is_swiotlb_force(struct device *dev); bool is_dev_swiotlb_force(struct device *dev); +struct page *dev_swiotlb_alloc(struct device *dev, size_t size, gfp_t gfp); +bool dev_swiotlb_free(struct device *dev, struct page *page, size_t size); #else static inline bool is_swiotlb_force(struct device *dev) { diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index a76a1a2f24da..f9a9321f7559 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include "direct.h" @@ -77,6 +78,10 @@ static bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size) static void __dma_direct_free_pages(struct device *dev, struct page *page, size_t size) { +#ifdef CONFIG_DMA_RESTRICTED_POOL + if (dev_swiotlb_free(dev, page, size)) + return; +#endif dma_free_contiguous(dev, page, size); } @@ -89,6 +94,12 @@ static struct page *__dma_direct_alloc_pages(struct device *dev, size_t size, WARN_ON_ONCE(!PAGE_ALIGNED(size)); +#ifdef CONFIG_DMA_RESTRICTED_POOL + page = dev_swiotlb_alloc(dev, size, gfp); + if (page) + return page; +#endif + gfp |= dma_direct_optimal_gfp_mask(dev, dev->coherent_dma_mask, &phys_limit); page = dma_alloc_contiguous(dev, size, gfp); @@ -147,7 +158,7 @@ void *dma_direct_alloc(struct device *dev, size_t size, gfp |= __GFP_NOWARN; if ((attrs & DMA_ATTR_NO_KERNEL_MAPPING) && - !force_dma_unencrypted(dev)) { + !force_dma_unencrypted(dev) && !is_dev_swiotlb_force(dev)) { page = __dma_direct_alloc_pages(dev, size, gfp & ~__GFP_ZERO); if (!page) return NULL; @@ -160,8 +171,8 @@ void *dma_direct_alloc(struct device *dev, size_t size, } if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED) && - !IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) && - !dev_is_dma_coherent(dev)) + !IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) && !dev_is_dma_coherent(dev) && + !is_dev_swiotlb_force(dev)) return arch_dma_alloc(dev, size, dma_handle, gfp, attrs); /* @@ -171,7 +182,9 @@ void *dma_direct_alloc(struct device *dev, size_t size, if (IS_ENABLED(CONFIG_DMA_COHERENT_POOL) && !gfpflags_allow_blocking(gfp) && (force_dma_unencrypted(dev) || - (IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) && !dev_is_dma_coherent(dev)))) + (IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) && + !dev_is_dma_coherent(dev))) && + !is_dev_swiotlb_force(dev)) return dma_direct_alloc_from_pool(dev, size, dma_handle, gfp); /* we always manually zero the memory once we are done */ @@ -252,15 +265,15 @@ void dma_direct_free(struct device *dev, size_t size, unsigned int page_order = get_order(size); if ((attrs & DMA_ATTR_NO_KERNEL_MAPPING) && - !force_dma_unencrypted(dev)) { + !force_dma_unencrypted(dev) && !is_dev_swiotlb_force(dev)) { /* cpu_addr is a struct page cookie, not a kernel address */ dma_free_contiguous(dev, cpu_addr, size); return; } if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED) && - !IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) && - !dev_is_dma_coherent(dev)) { + !IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) && !dev_is_dma_coherent(dev) && + !is_dev_swiotlb_force(dev)) { arch_dma_free(dev, size, cpu_addr, dma_addr, attrs); return; } @@ -288,7 +301,8 @@ struct page *dma_direct_alloc_pages(struct device *dev, size_t size, void *ret; if (IS_ENABLED(CONFIG_DMA_COHERENT_POOL) && - force_dma_unencrypted(dev) && !gfpflags_allow_blocking(gfp)) + force_dma_unencrypted(dev) && !gfpflags_allow_blocking(gfp) && + !is_dev_swiotlb_force(dev)) return dma_direct_alloc_from_pool(dev, size, dma_handle, gfp); page = __dma_direct_alloc_pages(dev, size, gfp); diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index fd9c1bd183ac..8b77fd64199e 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -836,6 +836,40 @@ late_initcall(swiotlb_create_default_debugfs); #endif #ifdef CONFIG_DMA_RESTRICTED_POOL +struct page *dev_swiotlb_alloc(struct device *dev, size_t size, gfp_t gfp) +{ + struct swiotlb *swiotlb; + phys_addr_t tlb_addr; + unsigned int index; + + /* dev_swiotlb_alloc can be used only in the context which permits sleeping. */ + if (!dev->dev_swiotlb || !gfpflags_allow_blocking(gfp)) + return NULL; + + swiotlb = dev->dev_swiotlb; + index = swiotlb_tbl_find_free_region(dev, swiotlb->start, size, 0); + if (index < 0) + return NULL; + + tlb_addr = swiotlb->start + (index << IO_TLB_SHIFT); + + return pfn_to_page(PFN_DOWN(tlb_addr)); +} + +bool dev_swiotlb_free(struct device *dev, struct page *page, size_t size) +{ + unsigned int index; + phys_addr_t tlb_addr = page_to_phys(page); + + if (!is_swiotlb_buffer(dev, tlb_addr)) + return false; + + index = (tlb_addr - dev->dev_swiotlb->start) >> IO_TLB_SHIFT; + swiotlb_tbl_release_region(dev, index, size); + + return true; +} + bool is_swiotlb_force(struct device *dev) { return unlikely(swiotlb_force == SWIOTLB_FORCE) || dev->dev_swiotlb; -- 2.30.0.478.g8a0d178c01-goog