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=-19.1 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 DF0F7C43460 for ; Tue, 18 May 2021 06:44:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C4F5A61263 for ; Tue, 18 May 2021 06:44:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346816AbhERGpk (ORCPT ); Tue, 18 May 2021 02:45:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33234 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346815AbhERGph (ORCPT ); Tue, 18 May 2021 02:45:37 -0400 Received: from mail-pf1-x42c.google.com (mail-pf1-x42c.google.com [IPv6:2607:f8b0:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 02187C06138D for ; Mon, 17 May 2021 23:44:17 -0700 (PDT) Received: by mail-pf1-x42c.google.com with SMTP id s19so4434280pfe.8 for ; Mon, 17 May 2021 23:44:16 -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=XERRPmZD9LZ8NlvTKf69Ki0Z3JOqJsfzsMjeGM/hmyc=; b=oT5AI3WxhLeqEGvrMWNth5ilokIoDf3aUpAY7upThFXBQOnHIqoXsdqVxmKsJ2ibAV p2tS4tJqThBqZvPuEA86u4i7tHwUvgMMmS6jwMmWzqazAKGD8hQRrm4uJZAQme8fQgO7 xMpoBHann0anuHkotadEJq5SA2Uh6yM8s5FoE= 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=XERRPmZD9LZ8NlvTKf69Ki0Z3JOqJsfzsMjeGM/hmyc=; b=ucqtg1ads5QYX8DB3urvRcBkdg1X18/OFJRbC7NGP46GXsm8r7souA9iB1YQApsLaQ 78hGBD41ZnULdJEdHES+7OD7YCaonbDh+ossHJbcHjsey58guxcQrzqdGnxPWLGmhjTW zDmgmQ2irSliHw/wdoU0r6LX5k1fTnU8z21NVK6yl3dKIkSU2xAbglWYItwR4G7nY1DI ChrmnhBofORruC8ZckVbO5EbuV/GSJN0KPswvKaXR8q0JSdVqjFhBhaNCrmCTOdOhhx1 TzzsMjVSCVHPKEj1R/81TUOw+DHg3De3U63V8PEBi4zCH5npzBJaAlqfAkLmKzT47K4A oALw== X-Gm-Message-State: AOAM531aGyd7YQvassW/jV3YfYb+j5nfm/CnqBvaUr0yLecYS1MJAMX3 eStJ7YKxgoFgzyH5aigeJhBLPA== X-Google-Smtp-Source: ABdhPJyi8T1bUdRh2weFxzn5qV51jHdwUH18sdVlzVJRpz5+Czvdmvjaq4flIajQeG3jnSiA7cCp7w== X-Received: by 2002:a05:6a00:15d4:b029:2de:a538:c857 with SMTP id o20-20020a056a0015d4b02902dea538c857mr438129pfu.51.1621320256584; Mon, 17 May 2021 23:44:16 -0700 (PDT) Received: from localhost ([2401:fa00:95:205:f284:b819:54ca:c198]) by smtp.gmail.com with UTF8SMTPSA id a7sm11612338pfg.76.2021.05.17.23.44.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 17 May 2021 23:44:16 -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 v7 12/15] swiotlb: Add restricted DMA alloc/free support. Date: Tue, 18 May 2021 14:42:12 +0800 Message-Id: <20210518064215.2856977-13-tientzu@chromium.org> X-Mailer: git-send-email 2.31.1.751.gd2f1c929bd-goog In-Reply-To: <20210518064215.2856977-1-tientzu@chromium.org> References: <20210518064215.2856977-1-tientzu@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: devicetree@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 | 4 ++++ kernel/dma/swiotlb.c | 35 +++++++++++++++++++++++++++++++++-- 2 files changed, 37 insertions(+), 2 deletions(-) diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index 0c5a18d9cf89..e8cf49bd90c5 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -134,6 +134,10 @@ unsigned int swiotlb_max_segment(void); size_t swiotlb_max_mapping_size(struct device *dev); bool is_swiotlb_active(struct device *dev); void __init swiotlb_adjust_size(unsigned long size); +#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); +#endif /* CONFIG_DMA_RESTRICTED_POOL */ #else #define swiotlb_force SWIOTLB_NO_FORCE static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr) diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index cef856d23194..d3fa4669229b 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -457,8 +457,9 @@ 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; } @@ -704,6 +705,36 @@ 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) { -- 2.31.1.751.gd2f1c929bd-goog