diff --git a/Documentation/warpdrive/warpdrive.rst b/Documentation/warpdrive/warpdrive.rst
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+Introduction of WarpDrive
+=========================
+
+*WarpDrive* is a general accelerator framework for the user application to
+access the hardware without going through the kernel in data path.
+
+It can be used as the quick channel for accelerators, network adaptors or
+other hardware for application in user space.
+
+This may make some implementation simpler.  E.g.  you can reuse most of the
+*netdev* driver in kernel and just share some ring buffer to the user space
+driver for *DPDK* [4] or *ODP* [5]. Or you can combine the RSA accelerator with
+the *netdev* in the user space as a https reversed proxy, etc.
+
+*WarpDrive* takes the hardware accelerator as a heterogeneous processor which
+can share particular load from the CPU:
+
+.. image:: wd.svg
+        :alt: WarpDrive Concept
+
+The virtual concept, queue, is used to manage the requests sent to the
+accelerator. The application send requests to the queue by writing to some
+particular address, while the hardware takes the requests directly from the
+address and send feedback accordingly.
+
+The format of the queue may differ from hardware to hardware. But the
+application need not to make any system call for the communication.
+
+*WarpDrive* tries to create a shared virtual address space for all involved
+accelerators. Within this space, the requests sent to queue can refer to any
+virtual address, which will be valid to the application and all involved
+accelerators.
+
+The name *WarpDrive* is simply a cool and general name meaning the framework
+makes the application faster. It includes general user library, kernel
+management module and drivers for the hardware. In kernel, the management
+module is called *uacce*, meaning "Unified/User-space-access-intended
+Accelerator Framework".
+
+
+How does it work
+================
+
+*WarpDrive* uses *mmap* and *IOMMU* to play the trick.
+
+*Uacce* creates a chrdev for the device registered to it. A "queue" will be
+created when the chrdev is opened. The application access the queue by mmap
+different address region of the queue file.
+
+The following figure demonstrated the queue file address space:
+
+.. image:: wd_q_addr_space.svg
+        :alt: WarpDrive Queue Address Space
+
+The first region of the space, device region, is used for the application to
+write request or read answer to or from the hardware.
+
+Normally, there can be three types of device regions mmio and memory regions.
+It is recommended to use common memory for request/answer descriptors and use
+the mmio space for device notification, such as doorbell. But of course, this
+is all up to the interface designer.
+
+There can be two types of device memory regions, kernel-only and user-shared.
+This will be explained in the "kernel APIs" section.
+
+The Static Share Virtual Memory region is necessary only when the device IOMMU
+does not support "Share Virtual Memory". This will be explained after the
+*IOMMU* idea.
+
+
+Architecture
+------------
+
+The full *WarpDrive* architecture is represented in the following class
+diagram:
+
+.. image:: wd-arch.svg
+        :alt: WarpDrive Architecture
+
+
+The user API
+------------
+
+We adopt a polling style interface in the user space: ::
+
+        int wd_request_queue(struct wd_queue *q);
+        void wd_release_queue(struct wd_queue *q);
+
+        int wd_send(struct wd_queue *q, void *req);
+        int wd_recv(struct wd_queue *q, void **req);
+        int wd_recv_sync(struct wd_queue *q, void **req);
+        void wd_flush(struct wd_queue *q);
+
+wd_recv_sync() is a wrapper to its non-sync version. It will trapped into
+kernel and waits until the queue become available.
+
+If the queue do not support SVA/SVM. The following helper function
+can be used to create Static Virtual Share Memory: ::
+
+        void *wd_preserve_share_memory(struct wd_queue *q, size_t size);
+
+The user API is not mandatory. It is simply a suggestion and hint what the
+kernel interface is supposed to support.
+
+
+The user driver
+---------------
+
+The queue file mmap space will need a user driver to wrap the communication
+protocol. *UACCE* provides some attributes in sysfs for the user driver to
+match the right accelerator accordingly.
+
+The *UACCE* device attribute is under the following directory:
+
+/sys/class/uacce/<dev-name>/params
+
+The following attributes is supported:
+
+nr_queue_remained (ro)
+        number of queue remained
+
+api_version (ro)
+        a string to identify the queue mmap space format and its version
+
+device_attr (ro)
+        attributes of the device, see UACCE_DEV_xxx flag defined in uacce.h
+
+numa_node (ro)
+        id of numa node
+
+priority (rw)
+        Priority or the device, bigger is higher
+
+(This is not yet implemented in RFC version)
+
+
+The kernel API
+--------------
+
+The *uacce* kernel API is defined in uacce.h. If the hardware support SVM/SVA,
+The driver need only the following API functions: ::
+
+        int uacce_register(uacce);
+        void uacce_unregister(uacce);
+        void uacce_wake_up(q);
+
+*uacce_wake_up* is used to notify the process who epoll() on the queue file.
+
+According to the IOMMU capability, *uacce* categories the devices as follow:
+
+UACCE_DEV_NOIOMMU
+        The device has no IOMMU. The user process cannot use VA on the hardware
+        This mode is not recommended.
+
+UACCE_DEV_SVA (UACCE_DEV_PASID | UACCE_DEV_FAULT_FROM_DEV)
+        The device has IOMMU which can share the same page table with user
+        process
+
+UACCE_DEV_SHARE_DOMAIN
+        The device has IOMMU which has no multiple page table and device page
+        fault support
+
+If the device works in mode other than UACCE_DEV_NOIOMMU, *uacce* will set its
+IOMMU to IOMMU_DOMAIN_UNMANAGED. So the driver must not use any kernel
+DMA API but the following ones from *uacce* instead: ::
+
+        uacce_dma_map(q, va, size, prot);
+        uacce_dma_unmap(q, va, size, prot);
+
+*uacce_dma_map/unmap* is valid only for UACCE_DEV_SVA device. It creates a
+particular PASID and page table for the kernel in the IOMMU (Not yet
+implemented in the RFC)
+
+For the UACCE_DEV_SHARE_DOMAIN device, uacce_dma_map/unmap is not valid.
+*Uacce* call back start_queue only when the DUS and DKO region is mmapped. The
+accelerator driver must use those dma buffer, via uacce_queue->qfrs[], on
+start_queue call back. The size of the queue file region is defined by
+uacce->ops->qf_pg_start[].
+
+We have to do it this way because most of current IOMMU cannot support the
+kernel and user virtual address at the same time. So we have to let them both
+share the same user virtual address space.
+
+If the device have to support kernel and user at the same time, both kernel
+and the user should use these DMA API. This is not convenient. A better
+solution is to change the future DMA/IOMMU design to let them separate the
+address space between the user and kernel space. But it is not going to be in
+a short time.
+
+
+Multiple processes support
+==========================
+
+In the latest mainline kernel (4.19) when this document is written, the IOMMU
+subsystem do not support multiple process page tables yet.
+
+Most IOMMU hardware implementation support multi-process with the concept
+of PASID. But they may use different name, e.g. it is call sub-stream-id in
+SMMU of ARM. With PASID or similar design, multi page table can be added to
+the IOMMU and referred by its PASID.
+
+*JPB* has a patchset to enable this[1]_. We have tested it with our hardware
+(which is known as *D06*). It works well. *WarpDrive* rely on them to support
+UACCE_DEV_SVA. If it is not enabled, *WarpDrive* can still work. But it
+support only one process, the device will be set to UACCE_DEV_SHARE_DOMAIN
+even it is set to UACCE_DEV_SVA initially.
+
+Static Share Virtual Memory is mainly used by UACCE_DEV_SHARE_DOMAIN device.
+
+
+Legacy Mode Support
+===================
+For the hardware without IOMMU, WarpDrive can still work, the only problem is
+VA cannot be used in the device. The driver should adopt another strategy for
+the shared memory. It is only for testing, and not recommended.
+
+
+The Folk Scenario
+=================
+For a process with allocated queues and shared memory, what happen if it forks
+a child?
+
+The fd of the queue will be duplicated on folk, so the child can send request
+to the same queue as its parent. But the requests which is sent from processes
+except for the one who open the queue will be blocked.
+
+It is recommended to add O_CLOEXEC to the queue file.
+
+The queue mmap space has a VM_DONTCOPY in its VMA. So the child will lost all
+those VMAs.
+
+This is why *WarpDrive* does not adopt the mode used in *VFIO* and *InfiniBand*.
+Both solutions can set any user pointer for hardware sharing. But they cannot
+support fork when the dma is in process. Or the "Copy-On-Write" procedure will
+make the parent process lost its physical pages.
+
+
+The Sample Code
+===============
+There is a sample user land implementation with a simple driver for Hisilicon
+Hi1620 ZIP Accelerator.
+
+To test, do the following in samples/warpdrive (for the case of PC host): ::
+        ./autogen.sh
+        ./conf.sh       # or simply ./configure if you build on target system
+        make
+
+Then you can get test_hisi_zip in the test subdirectory. Copy it to the target
+system and make sure the hisi_zip driver is enabled (the major and minor of
+the uacce chrdev can be gotten from the dmesg or sysfs), and run: ::
+        mknod /dev/ua1 c <major> <minior>
+        test/test_hisi_zip -z < data > data.zip
+        test/test_hisi_zip -g < data > data.gzip
+
+
+References
+==========
+.. [1] https://patchwork.kernel.org/patch/10394851/
+
+.. vim: tw=78
diff --git a/Documentation/warpdrive/wd-arch.svg b/Documentation/warpdrive/wd-arch.svg
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diff --git a/Documentation/warpdrive/wd_q_addr_space.svg b/Documentation/warpdrive/wd_q_addr_space.svg
new file mode 100644
index 000000000000..5e6cf8e89908
--- /dev/null
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