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=-18.9 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 4D67AC48BD1 for ; Fri, 11 Jun 2021 15:28:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3C43D613FA for ; Fri, 11 Jun 2021 15:28:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231895AbhFKPav (ORCPT ); Fri, 11 Jun 2021 11:30:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39454 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231804AbhFKPas (ORCPT ); Fri, 11 Jun 2021 11:30:48 -0400 Received: from mail-pj1-x102e.google.com (mail-pj1-x102e.google.com [IPv6:2607:f8b0:4864:20::102e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C3358C061574 for ; Fri, 11 Jun 2021 08:28:50 -0700 (PDT) Received: by mail-pj1-x102e.google.com with SMTP id md2-20020a17090b23c2b029016de4440381so6195629pjb.1 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=RvCBEYpdntUI7F71v8SRUTOS7bcakpC4Yqw3w1iMZIIVxKMYwH0Nq1nE2Y2RDHV+1l QC6AAxUkLcWh88gDPHk6/6HPl8kGWAyNc+KbyppqaMOvvIBHnZGpXCFtiEUoxguiuYtn pbP0lMT5XG1RgQVKCbsdRGvqbeIHi1W6Oa+SzxfP4AQXbdKnHcFF6K6NiJ7Mx0iCuxgM rNxa7LWIOe/RAm6h65SnSWZhUblXKq+ooNr9nq1f65oJ+KP4OaESBQ8GekSAHGqKYh0K wPSDy9DBUgzo9MOVcQ7KyR/WoWY0HEBTe+xGhannp1h/zXOJgqVLFiCPp4a36kUqj0zg zC/A== X-Gm-Message-State: AOAM530US4fWCP5d5zT8Op6sNQqVe3uJ+p+7bon/+MwOIo58TLrjBJFJ 6zsNHfi8THGbVbyml8LfkQrDTg== 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 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, rodrigo.vivi@intel.com, thomas.hellstrom@linux.intel.com 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 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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) { -- 2.32.0.272.g935e593368-goog