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, 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 9CE0CC47089 for ; Thu, 27 May 2021 13:04:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7AA146128B for ; Thu, 27 May 2021 13:04:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236303AbhE0NGF (ORCPT ); Thu, 27 May 2021 09:06:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57362 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236252AbhE0NF4 (ORCPT ); Thu, 27 May 2021 09:05:56 -0400 Received: from mail-pg1-x535.google.com (mail-pg1-x535.google.com [IPv6:2607:f8b0:4864:20::535]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 969C4C061761 for ; Thu, 27 May 2021 06:04:20 -0700 (PDT) Received: by mail-pg1-x535.google.com with SMTP id i5so3680149pgm.0 for ; Thu, 27 May 2021 06:04:20 -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=g9sAWaw9/Ru404/gNZK/9yCFJ+COY6ShgEN5yl9rius=; b=RU9c38RKOmRl8qLPe9nfaNayIMAo/KhsxRPQb+p1I2/vkq857xJH1yHb2hsJr/oLI5 OzLGwV9+GOm93mot3oVKzRPIFGItH+esVlARoN4qqQuH+rUWPo604KbT7KtsniJEDbEo HQFJYd6CK0U3jnTgrILmcYyxGPhhzyPRwcTRo= 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=g9sAWaw9/Ru404/gNZK/9yCFJ+COY6ShgEN5yl9rius=; b=MowfSAHndqxmCR+M/D2p77FFeT3otRc5be57+kmmKLYH/na3X54Wer9zOZKb3PdEkC mU4NXTiMBX+s0HBF6basWGlQYaP0Y+mRizXkGTrdEbpYUaMwSMqafJzRkjVc9FvjztBo yTs68usHQnXWxQZzNNbHjJNQ6eXQszxOIjlYsj7ZJVwOBcoQ4a/CrTHtwEg/3Zljdaue 08mpN3SoN3X2rxzSbnP9/RFr+WVJfAtx1DGmeuvcW2Zi5JAlS0BrvZoBu8pP8zV0MlMq 9KRERU6gij9RMu/ktS7qLLAXju6vrQsMXRrVnBYHpvE/BRLQZF8E6GJseTAhkarcLtHy E3WA== X-Gm-Message-State: AOAM530ANpjCBl6r6zvSS8vsfjQevAI+NKRibfB4WdqyddToVqjUXc0/ WBOHr1riD5X8GMvQpyNfk6tFBg== X-Google-Smtp-Source: ABdhPJw+tNdufRtYdRKBadLokBr1RMenJ8TRt7icb84uhhJq7TwV1n1jRizQR2Rn5o3HccoeyQdcjw== X-Received: by 2002:aa7:9438:0:b029:2df:258e:7f10 with SMTP id y24-20020aa794380000b02902df258e7f10mr3229291pfo.79.1622120660147; Thu, 27 May 2021 06:04:20 -0700 (PDT) Received: from localhost ([2401:fa00:95:205:a93:378d:9a9e:3b70]) by smtp.gmail.com with UTF8SMTPSA id o3sm1937619pgh.22.2021.05.27.06.04.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 27 May 2021 06:04:19 -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 v8 15/15] of: Add plumbing for restricted DMA pool Date: Thu, 27 May 2021 21:03:29 +0800 Message-Id: <20210527130329.1853588-5-tientzu@chromium.org> X-Mailer: git-send-email 2.31.1.818.g46aad6cb9e-goog In-Reply-To: <20210527130329.1853588-1-tientzu@chromium.org> References: <20210527130329.1853588-1-tientzu@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org If a device is not behind an IOMMU, we look up the device node and set up the restricted DMA when the restricted-dma-pool is presented. Signed-off-by: Claire Chang --- drivers/of/address.c | 33 +++++++++++++++++++++++++++++++++ drivers/of/device.c | 3 +++ drivers/of/of_private.h | 6 ++++++ 3 files changed, 42 insertions(+) diff --git a/drivers/of/address.c b/drivers/of/address.c index aca94c348bd4..6cc7eaaf7e11 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -1112,6 +1113,38 @@ bool of_dma_is_coherent(struct device_node *np) } EXPORT_SYMBOL_GPL(of_dma_is_coherent); +int of_dma_set_restricted_buffer(struct device *dev, struct device_node *np) +{ + struct device_node *node, *of_node = dev->of_node; + int count, i; + + count = of_property_count_elems_of_size(of_node, "memory-region", + sizeof(u32)); + /* + * If dev->of_node doesn't exist or doesn't contain memory-region, try + * the OF node having DMA configuration. + */ + if (count <= 0) { + of_node = np; + count = of_property_count_elems_of_size( + of_node, "memory-region", sizeof(u32)); + } + + for (i = 0; i < count; i++) { + node = of_parse_phandle(of_node, "memory-region", i); + /* + * There might be multiple memory regions, but only one + * restricted-dma-pool region is allowed. + */ + if (of_device_is_compatible(node, "restricted-dma-pool") && + of_device_is_available(node)) + return of_reserved_mem_device_init_by_idx(dev, of_node, + i); + } + + return 0; +} + /** * of_mmio_is_nonposted - Check if device uses non-posted MMIO * @np: device node diff --git a/drivers/of/device.c b/drivers/of/device.c index c5a9473a5fb1..2defdca418ec 100644 --- a/drivers/of/device.c +++ b/drivers/of/device.c @@ -165,6 +165,9 @@ int of_dma_configure_id(struct device *dev, struct device_node *np, arch_setup_dma_ops(dev, dma_start, size, iommu, coherent); + if (!iommu) + return of_dma_set_restricted_buffer(dev, np); + return 0; } EXPORT_SYMBOL_GPL(of_dma_configure_id); diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h index d717efbd637d..8fde97565d11 100644 --- a/drivers/of/of_private.h +++ b/drivers/of/of_private.h @@ -163,12 +163,18 @@ struct bus_dma_region; #if defined(CONFIG_OF_ADDRESS) && defined(CONFIG_HAS_DMA) int of_dma_get_range(struct device_node *np, const struct bus_dma_region **map); +int of_dma_set_restricted_buffer(struct device *dev, struct device_node *np); #else static inline int of_dma_get_range(struct device_node *np, const struct bus_dma_region **map) { return -ENODEV; } +static inline int of_dma_set_restricted_buffer(struct device *dev, + struct device_node *np) +{ + return -ENODEV; +} #endif #endif /* _LINUX_OF_PRIVATE_H */ -- 2.31.1.818.g46aad6cb9e-goog