From patchwork Fri Jun 11 15:26:56 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claire Chang X-Patchwork-Id: 12315955 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 14324C48BE0 for ; Fri, 11 Jun 2021 15:28:52 +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 DB832613FA for ; Fri, 11 Jun 2021 15:28:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DB832613FA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 44AA06EEC1; Fri, 11 Jun 2021 15:28:51 +0000 (UTC) Received: from mail-pj1-x102b.google.com (mail-pj1-x102b.google.com [IPv6:2607:f8b0:4864:20::102b]) by gabe.freedesktop.org (Postfix) with ESMTPS id B3D526EEC1 for ; Fri, 11 Jun 2021 15:28:50 +0000 (UTC) Received: by mail-pj1-x102b.google.com with SMTP id go18-20020a17090b03d2b029016e4ae973f7so5090245pjb.0 for ; Fri, 11 Jun 2021 08:28:50 -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=kF6lfFlm47ewlGSwNHdOa0bRh+k/2w/JyGCG+Bsk7jg=; b=H/C67oW7mc9oS6nqFrlyQ5bKo2M4IEytOonNmobjWozjPKJmD5foT/Xw7AFSNzd2Jo 0wjSUN2RW/ppa8UiQ09kGN695gbXZ6TGfgjGghWkAaCeHdylaYggXNn7A87sM831TjH9 l31C3Fl2eMIXd/0uX15rNLpBd42Axwn6s/C8I= 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=kF6lfFlm47ewlGSwNHdOa0bRh+k/2w/JyGCG+Bsk7jg=; b=s6HbjlQCpb0JlS16BKHVyVdkFJbUnjI7pNTZLdaKy/WlxRQQ2bLFtJU9sMI1G32OgX qcqRI4TciTIqH7XQd0kcDqCuVpUcs5LUHKSByekaSYX2qI7SkuuAU378D4/pln4x+Fxc UikVOAsIT0Fbj0RUADMiUkbBBnOeXQG6d5qpksEaH/2OG5S59HtzGpqzI4oRxjd4V6uL xWFzJKufoVDXCpMDc/v3PRtFCyZ69Kw4ZvnV1BZMr2BjDDcUSXqsCrYb0uIRQ+u1MOhu NNwqyzJSeCTJMxwUYMG2ziQ6RWnGwvV8XumJWX+puCb9+OVvUEIgycb2GNxvlUJspvu6 Owyw== X-Gm-Message-State: AOAM532tB7sJINYERD5lw8Q6bvZaZxnePCnUBFyFytBiWTONTVZ+ZL6K rSycuiPz20pA69Y0xqDmTSusRg== X-Google-Smtp-Source: ABdhPJwmTa5xH/d7onV720jkujld6c+EE1EDx86RTuZajd94EHAxdcF++t/hrsHfq11H6lXLYCr71w== X-Received: by 2002:a17:902:d4d0:b029:113:fb3d:3644 with SMTP id o16-20020a170902d4d0b0290113fb3d3644mr4373020plg.58.1623425330334; Fri, 11 Jun 2021 08:28:50 -0700 (PDT) Received: from localhost ([2401:fa00:95:205:33c8:8e01:1161:6797]) by smtp.gmail.com with UTF8SMTPSA id p11sm3312697pjj.43.2021.06.11.08.28.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 11 Jun 2021 08:28:49 -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 Subject: [PATCH v9 11/14] swiotlb: Add restricted DMA alloc/free support. Date: Fri, 11 Jun 2021 23:26:56 +0800 Message-Id: <20210611152659.2142983-12-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 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - 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, 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 , rodrigo.vivi@intel.com, 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: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add the functions, swiotlb_{alloc,free} to support the memory allocation from restricted DMA pool. Signed-off-by: Claire Chang --- include/linux/swiotlb.h | 15 +++++++++++++++ kernel/dma/swiotlb.c | 35 +++++++++++++++++++++++++++++++++-- 2 files changed, 48 insertions(+), 2 deletions(-) diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index 8200c100fe10..d3374497a4f8 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -162,4 +162,19 @@ static inline void swiotlb_adjust_size(unsigned long size) extern void swiotlb_print_info(void); extern void swiotlb_set_max_segment(unsigned int); +#ifdef CONFIG_DMA_RESTRICTED_POOL +struct page *swiotlb_alloc(struct device *dev, size_t size); +bool swiotlb_free(struct device *dev, struct page *page, size_t size); +#else +static inline struct page *swiotlb_alloc(struct device *dev, size_t size) +{ + return NULL; +} +static inline bool swiotlb_free(struct device *dev, struct page *page, + size_t size) +{ + return false; +} +#endif /* CONFIG_DMA_RESTRICTED_POOL */ + #endif /* __LINUX_SWIOTLB_H */ diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index a6562573f090..0a19858da5b8 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -461,8 +461,9 @@ static int find_slots(struct device *dev, phys_addr_t orig_addr, index = wrap = wrap_index(mem, ALIGN(mem->index, stride)); do { - if ((slot_addr(tbl_dma_addr, index) & iotlb_align_mask) != - (orig_addr & iotlb_align_mask)) { + if (orig_addr && + (slot_addr(tbl_dma_addr, index) & iotlb_align_mask) != + (orig_addr & iotlb_align_mask)) { index = wrap_index(mem, index + 1); continue; } @@ -702,6 +703,36 @@ late_initcall(swiotlb_create_default_debugfs); #endif #ifdef CONFIG_DMA_RESTRICTED_POOL +struct page *swiotlb_alloc(struct device *dev, size_t size) +{ + struct io_tlb_mem *mem = dev->dma_io_tlb_mem; + phys_addr_t tlb_addr; + int index; + + if (!mem) + return NULL; + + index = find_slots(dev, 0, size); + if (index == -1) + return NULL; + + tlb_addr = slot_addr(mem->start, index); + + return pfn_to_page(PFN_DOWN(tlb_addr)); +} + +bool swiotlb_free(struct device *dev, struct page *page, size_t size) +{ + phys_addr_t tlb_addr = page_to_phys(page); + + if (!is_swiotlb_buffer(dev, tlb_addr)) + return false; + + release_slots(dev, tlb_addr); + + return true; +} + static int rmem_swiotlb_device_init(struct reserved_mem *rmem, struct device *dev) {