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Mon, 27 Jul 2020 22:02:05 -0700 (PDT) From: Claire Chang To: robh+dt@kernel.org, frowand.list@gmail.com, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com Subject: [RFC v2 4/5] dt-bindings: of: Add plumbing for restricted DMA pool Date: Tue, 28 Jul 2020 13:01:39 +0800 Message-Id: <20200728050140.996974-5-tientzu@chromium.org> X-Mailer: git-send-email 2.28.0.rc0.142.g3c755180ce-goog In-Reply-To: <20200728050140.996974-1-tientzu@chromium.org> References: <20200728050140.996974-1-tientzu@chromium.org> MIME-Version: 1.0 Cc: devicetree@vger.kernel.org, heikki.krogerus@linux.intel.com, saravanak@google.com, suzuki.poulose@arm.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, bgolaszewski@baylibre.com, iommu@lists.linux-foundation.org, drinkcat@chromium.org, tientzu@chromium.org, dan.j.williams@intel.com, treding@nvidia.com X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" Introduce the new compatible string, device-swiotlb-pool, for restricted DMA. One can specify the address and length of the device swiotlb memory region by device-swiotlb-pool in the device tree. Signed-off-by: Claire Chang --- .../reserved-memory/reserved-memory.txt | 35 +++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt b/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt index 4dd20de6977f..78850896e1d0 100644 --- a/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt +++ b/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt @@ -51,6 +51,24 @@ compatible (optional) - standard definition used as a shared pool of DMA buffers for a set of devices. It can be used by an operating system to instantiate the necessary pool management subsystem if necessary. + - device-swiotlb-pool: This indicates a region of memory meant to be + used as a pool of device swiotlb buffers for a given device. When + using this, the no-map and reusable properties must not be set, so the + operating system can create a virtual mapping that will be used for + synchronization. Also, there must be a restricted-dma property in the + device node to specify the indexes of reserved-memory nodes. One can + specify two reserved-memory nodes in the device tree. One with + shared-dma-pool to handle the coherent DMA buffer allocation, and + another one with device-swiotlb-pool for regular DMA to/from system + memory, which would be subject to bouncing. The main purpose for + restricted DMA is to mitigate the lack of DMA access control on + systems without an IOMMU, which could result in the DMA accessing the + system memory at unexpected times and/or unexpected addresses, + possibly leading to data leakage or corruption. The feature on its own + provides a basic level of protection against the DMA overwriting buffer + contents at unexpected times. However, to protect against general data + leakage and system memory corruption, the system needs to provide a + way to restrict the DMA to a predefined memory region. - vendor specific string in the form ,[-] no-map (optional) - empty property - Indicates the operating system must not create a virtual mapping @@ -117,6 +135,16 @@ one for multimedia processing (named multimedia-memory@77000000, 64MiB). compatible = "acme,multimedia-memory"; reg = <0x77000000 0x4000000>; }; + + wifi_coherent_mem_region: wifi_coherent_mem_region { + compatible = "shared-dma-pool"; + reg = <0x50000000 0x400000>; + }; + + wifi_device_swiotlb_region: wifi_device_swiotlb_region { + compatible = "device-swiotlb-pool"; + reg = <0x50400000 0x4000000>; + }; }; /* ... */ @@ -135,4 +163,11 @@ one for multimedia processing (named multimedia-memory@77000000, 64MiB). memory-region = <&multimedia_reserved>; /* ... */ }; + + pcie_wifi: pcie_wifi@0,0 { + memory-region = <&wifi_coherent_mem_region>, + <&wifi_device_swiotlb_region>; + restricted-dma = <0>, <1>; + /* ... */ + }; }; -- 2.28.0.rc0.142.g3c755180ce-goog _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu