From patchwork Thu Apr 22 08:15:08 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claire Chang X-Patchwork-Id: 12217951 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=-18.8 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 DBFCCC433ED for ; Thu, 22 Apr 2021 08:17:51 +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 5DF556140F for ; Thu, 22 Apr 2021 08:17:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5DF556140F 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.115155.219631 (Exim 4.92) (envelope-from ) id 1lZUWr-0003Td-Gj; Thu, 22 Apr 2021 08:17:41 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 115155.219631; Thu, 22 Apr 2021 08:17:41 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lZUWr-0003TV-D9; Thu, 22 Apr 2021 08:17:41 +0000 Received: by outflank-mailman (input) for mailman id 115155; Thu, 22 Apr 2021 08:17:40 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lZUWq-0003Kb-DZ for xen-devel@lists.xenproject.org; Thu, 22 Apr 2021 08:17:40 +0000 Received: from mail-pg1-x531.google.com (unknown [2607:f8b0:4864:20::531]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 4f4cd902-7eac-4807-8e26-29d05627c07f; Thu, 22 Apr 2021 08:17:35 +0000 (UTC) Received: by mail-pg1-x531.google.com with SMTP id y32so32286919pga.11 for ; Thu, 22 Apr 2021 01:17:35 -0700 (PDT) Received: from localhost ([2401:fa00:1:10:1a8e:1bde:f79e:c302]) by smtp.gmail.com with UTF8SMTPSA id mv13sm4264856pjb.29.2021.04.22.01.17.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 22 Apr 2021 01:17:34 -0700 (PDT) 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: 4f4cd902-7eac-4807-8e26-29d05627c07f 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=5bO8jBPxmhc0FYqpDIHIi403K+/m2pjsRxNa/hQYLNg=; b=l9dZkekI9ynak1cuuz1gZEfzuFdcwaCQxSVspMCgfzWBUCPeiChd4qGtfGgmbrGqK2 DyiawYfp+L38t6whTuTgSmM/zP9uUBMfUt0vr6RIepKhIQRnK+Qsf9YyFSWIU0Sx1467 uTVIPlK/thBY3/BeX7BGvXMZOQsxqlxc89h6k= 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=5bO8jBPxmhc0FYqpDIHIi403K+/m2pjsRxNa/hQYLNg=; b=iwbzCcSPhhJ8VwH6qaqtQ6EUpT2k+neKvF2ssFmYbRFGfglKCcaHxMU9UeuF78Ak8L voirmYAUDfgI7pqSSUP4Bi8FmpNDTfxsIZ38hO9EejO+/8M0PIzXyj50b4pvbQWQLE5C CEKPx0Xpx1mwtPSMwIKZ+uEInxCVD/me9EuyWew4CpnkvIcEfsV/xaDeGDqaQhCSdVW9 kO4PKzvTp/zS5wbv+cvQqeUsIN4uTjZAUYRYtDly2+F3sXn7/PkUS8rM0ABb4ZeMbAQi omRDuJYeS4NXqcjsueGnUTmf2ZvrGbuAig6kyc5xB5/oLdISSxrff5+dtx2lNASVKD1i aHRg== X-Gm-Message-State: AOAM532bIfXCXWXo74BsAhvCtjie49FHg0VCahxhTvJ9y8JCqjofJVVL ofqqYuBjAFYzNJD3yJnyDS+91A== X-Google-Smtp-Source: ABdhPJzasU+vpN6SUMMsssz/FXWOLp6M4bgGVD/oD8ztZdWuu4tvnvoUWMHmVZ54Ezi6ND2Z2q+dSQ== X-Received: by 2002:a65:6a4c:: with SMTP id o12mr2325173pgu.371.1619079455178; Thu, 22 Apr 2021 01:17:35 -0700 (PDT) From: Claire Chang To: 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, nouveau@lists.freedesktop.org, rodrigo.vivi@intel.com, thomas.hellstrom@linux.intel.com Subject: [PATCH v5 16/16] of: Add plumbing for restricted DMA pool Date: Thu, 22 Apr 2021 16:15:08 +0800 Message-Id: <20210422081508.3942748-17-tientzu@chromium.org> X-Mailer: git-send-email 2.31.1.368.gbe11c130af-goog In-Reply-To: <20210422081508.3942748-1-tientzu@chromium.org> References: <20210422081508.3942748-1-tientzu@chromium.org> MIME-Version: 1.0 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 | 25 +++++++++++++++++++++++++ drivers/of/device.c | 3 +++ drivers/of/of_private.h | 5 +++++ 3 files changed, 33 insertions(+) diff --git a/drivers/of/address.c b/drivers/of/address.c index 54f221dde267..fff3adfe4986 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -1109,6 +1110,30 @@ 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 *node; + int count, i; + + if (!dev->of_node) + return 0; + + count = of_property_count_elems_of_size(dev->of_node, "memory-region", + sizeof(phandle)); + for (i = 0; i < count; i++) { + node = of_parse_phandle(dev->of_node, "memory-region", i); + /* There might be multiple memory regions, but only one + * restriced-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, 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..d8d865223e51 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); + 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..e9237f5eff48 100644 --- a/drivers/of/of_private.h +++ b/drivers/of/of_private.h @@ -163,12 +163,17 @@ 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); #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_get_restricted_buffer(struct device *dev) +{ + return -ENODEV; +} #endif #endif /* _LINUX_OF_PRIVATE_H */