diff --git a/Documentation/00-INDEX b/Documentation/00-INDEX
index 2754fe83f0d4..9959affab599 100644
--- a/Documentation/00-INDEX
+++ b/Documentation/00-INDEX
@@ -410,6 +410,8 @@ vm/
 	- directory with info on the Linux vm code.
 w1/
 	- directory with documents regarding the 1-wire (w1) subsystem.
+warpdrive/
+	- directory with documents about WarpDrive accelerator framework.
 watchdog/
 	- how to auto-reboot Linux if it has "fallen and can't get up". ;-)
 wimax/
diff --git a/Documentation/warpdrive/warpdrive.rst b/Documentation/warpdrive/warpdrive.rst
new file mode 100644
index 000000000000..6d2a5d1e08c4
--- /dev/null
+++ b/Documentation/warpdrive/warpdrive.rst
@@ -0,0 +1,100 @@
+Introduction of WarpDrive
+=========================
+
+*WarpDrive* is a general accelerator framework for user space. It intends to
+provide interface for the user process to send request to hardware
+accelerator without heavy user-kernel interaction cost.
+
+The *WarpDrive* user library is supposed to provide a pipe-based API, such as:
+        ::
+        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);
+        int wd_flush(struct wd_queue *q);
+
+*wd_request_queue* creates the pipe connection, *queue*, between the
+application and the hardware. The application sends request and pulls the
+answer back by asynchronized wd_send/wd_recv, which directly interact with the
+hardware (by MMIO or share memory) without syscall.
+
+*WarpDrive* maintains a unified application address space among all involved
+accelerators.  With the following APIs: ::
+
+        int wd_mem_share(struct wd_queue *q, const void *addr,
+                         size_t size, int flags);
+        void wd_mem_unshare(struct wd_queue *q, const void *addr, size_t size);
+
+The referred process space shared by these APIs can be directly referred by the
+hardware. The process can also dedicate its whole process space with flags,
+*WD_SHARE_ALL* (not in this patch yet).
+
+The name *WarpDrive* is simply a cool and general name meaning the framework
+makes the application faster. As it will be explained in this text later, the
+facility in kernel is called *SDMDEV*, namely "Share Domain Mediated Device".
+
+
+How does it work
+================
+
+*WarpDrive* is built upon *VFIO-MDEV*. The queue is wrapped as *mdev* in VFIO.
+So memory sharing can be done via standard VFIO standard DMA interface.
+
+The architecture is illustrated as follow figure:
+
+.. image:: wd-arch.svg
+        :alt: WarpDrive Architecture
+
+Accelerator driver shares its capability via *SDMDEV* API: ::
+
+        vfio_sdmdev_register(struct vfio_sdmdev *sdmdev);
+        vfio_sdmdev_unregister(struct vfio_sdmdev *sdmdev);
+        vfio_sdmdev_wake_up(struct spimdev_queue *q);
+
+*vfio_sdmdev_register* is a helper function to register the hardware to the
+*VFIO_MDEV* framework. The queue creation is done by *mdev* creation interface.
+
+*WarpDrive* User library mmap the mdev to access its mmio space and shared
+memory. Request can be sent to, or receive from, hardware in this mmap-ed
+space until the queue is full or empty.
+
+The user library can wait on the queue by ioctl(VFIO_SDMDEV_CMD_WAIT) the mdev
+if the queue is full or empty. If the queue status is changed, the hardware
+driver use *vfio_sdmdev_wake_up* to wake up the waiting process.
+
+
+Multiple processes support
+==========================
+
+In the latest mainline kernel (4.18) when this document is written,
+multi-process is not supported in VFIO yet.
+
+Jean Philippe Brucker has a patchset to enable it[1]_. We have tested it
+with our hardware (which is known as *D06*). It works well. *WarpDrive* rely
+on them to support multiple processes. If it is not enabled, *WarpDrive* can
+still work, but it support only one mdev for a process, which will share the
+same io map table with kernel. (But it is not going to be a security problem,
+since the user application cannot access the kernel address space)
+
+When multiprocess is support, mdev can be created based on how many
+hardware resource (queue) is available. Because the VFIO framework accepts only
+one open from one mdev iommu_group. Mdev become the smallest unit for process
+to use queue. And the mdev will not be released if the user process exist. So
+it will need a resource agent to manage the mdev allocation for the user
+process. This is not in this document's range.
+
+
+Legacy Mode Support
+===================
+For the hardware on which IOMMU is not support, WarpDrive can run on *NOIOMMU*
+mode. That require some update to the mdev driver, which is not included in
+this version yet.
+
+
+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
new file mode 100644
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