misc: mic: remove the MIC drivers

This patch removes the MIC drivers from the kernel tree
since the corresponding devices have been discontinued.

Removing the dma and char-misc changes in one patch and
merging via the char-misc tree is best to avoid any
potential build breakage.

Cc: Nikhil Rao <nikhil.rao@intel.com>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com>
Acked-By: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Sherry Sun <sherry.sun@nxp.com>
Link: https://lore.kernel.org/r/8c1443136563de34699d2c084df478181c205db4.1603854416.git.sudeep.dutt@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 0 insertions, 209 deletions

diff --git a/Documentation/misc-devices/mic/index.rst b/Documentation/misc-devices/mic/index.rst
deleted file mode 100644
index 3a8d06367ef1..000000000000
--- a/Documentation/misc-devices/mic/index.rst
+++ /dev/null
@@ -1,16 +0,0 @@
-=============================================
-Intel Many Integrated Core (MIC) architecture
-=============================================
-
-.. toctree::
-    :maxdepth: 1
-
-    mic_overview
-    scif_overview
-
-.. only::  subproject and html
-
-   Indices
-   =======
-
-   * :ref:`genindex`
diff --git a/Documentation/misc-devices/mic/mic_overview.rst b/Documentation/misc-devices/mic/mic_overview.rst
deleted file mode 100644
index 17d956bdaf7c..000000000000
--- a/Documentation/misc-devices/mic/mic_overview.rst
+++ /dev/null
@@ -1,85 +0,0 @@
-======================================================
-Intel Many Integrated Core (MIC) architecture overview
-======================================================
-
-An Intel MIC X100 device is a PCIe form factor add-in coprocessor
-card based on the Intel Many Integrated Core (MIC) architecture
-that runs a Linux OS. It is a PCIe endpoint in a platform and therefore
-implements the three required standard address spaces i.e. configuration,
-memory and I/O. The host OS loads a device driver as is typical for
-PCIe devices. The card itself runs a bootstrap after reset that
-transfers control to the card OS downloaded from the host driver. The
-host driver supports OSPM suspend and resume operations. It shuts down
-the card during suspend and reboots the card OS during resume.
-The card OS as shipped by Intel is a Linux kernel with modifications
-for the X100 devices.
-
-Since it is a PCIe card, it does not have the ability to host hardware
-devices for networking, storage and console. We provide these devices
-on X100 coprocessors thus enabling a self-bootable equivalent
-environment for applications. A key benefit of our solution is that it
-leverages the standard virtio framework for network, disk and console
-devices, though in our case the virtio framework is used across a PCIe
-bus. A Virtio Over PCIe (VOP) driver allows creating user space
-backends or devices on the host which are used to probe virtio drivers
-for these devices on the MIC card. The existing VRINGH infrastructure
-in the kernel is used to access virtio rings from the host. The card
-VOP driver allows card virtio drivers to communicate with their user
-space backends on the host via a device page. Ring 3 apps on the host
-can add, remove and configure virtio devices. A thin MIC specific
-virtio_config_ops is implemented which is borrowed heavily from
-previous similar implementations in lguest and s390.
-
-MIC PCIe card has a dma controller with 8 channels. These channels are
-shared between the host s/w and the card s/w. 0 to 3 are used by host
-and 4 to 7 by card. As the dma device doesn't show up as PCIe device,
-a virtual bus called mic bus is created and virtual dma devices are
-created on it by the host/card drivers. On host the channels are private
-and used only by the host driver to transfer data for the virtio devices.
-
-The Symmetric Communication Interface (SCIF (pronounced as skiff)) is a
-low level communications API across PCIe currently implemented for MIC.
-More details are available at scif_overview.txt.
-
-The Coprocessor State Management (COSM) driver on the host allows for
-boot, shutdown and reset of Intel MIC devices. It communicates with a COSM
-"client" driver on the MIC cards over SCIF to perform these functions.
-
-Here is a block diagram of the various components described above. The
-virtio backends are situated on the host rather than the card given better
-single threaded performance for the host compared to MIC, the ability of
-the host to initiate DMA's to/from the card using the MIC DMA engine and
-the fact that the virtio block storage backend can only be on the host::
-
-               +----------+           |             +----------+
-               | Card OS  |           |             | Host OS  |
-               +----------+           |             +----------+
-                                      |
-        +-------+ +--------+ +------+ | +---------+  +--------+ +--------+
-        | Virtio| |Virtio  | |Virtio| | |Virtio   |  |Virtio  | |Virtio  |
-        | Net   | |Console | |Block | | |Net      |  |Console | |Block   |
-        | Driver| |Driver  | |Driver| | |backend  |  |backend | |backend |
-        +---+---+ +---+----+ +--+---+ | +---------+  +----+---+ +--------+
-            |         |         |     |      |            |         |
-            |         |         |     |User  |            |         |
-            |         |         |     |------|------------|--+------|-------
-            +---------+---------+     |Kernel                |
-                      |               |                      |
-  +---------+     +---+----+ +------+ | +------+ +------+ +--+---+  +-------+
-  |MIC DMA  |     |  VOP   | | SCIF | | | SCIF | | COSM | | VOP  |  |MIC DMA|
-  +---+-----+     +---+----+ +--+---+ | +--+---+ +--+---+ +------+  +----+--+
-      |               |         |     |    |        |                    |
-  +---+-----+     +---+----+ +--+---+ | +--+---+ +--+---+ +------+  +----+--+
-  |MIC      |     |  VOP   | |SCIF  | | |SCIF  | | COSM | | VOP  |  | MIC   |
-  |HW Bus   |     |  HW Bus| |HW Bus| | |HW Bus| | Bus  | |HW Bus|  |HW Bus |
-  +---------+     +--------+ +--+---+ | +--+---+ +------+ +------+  +-------+
-      |               |         |     |       |     |                    |
-      |   +-----------+--+      |     |       |    +---------------+     |
-      |   |Intel MIC     |      |     |       |    |Intel MIC      |     |
-      |   |Card Driver   |      |     |       |    |Host Driver    |     |
-      +---+--------------+------+     |       +----+---------------+-----+
-                 |                    |                   |
-             +-------------------------------------------------------------+
-             |                                                             |
-             |                    PCIe Bus                                 |
-             +-------------------------------------------------------------+
diff --git a/Documentation/misc-devices/mic/scif_overview.rst b/Documentation/misc-devices/mic/scif_overview.rst
deleted file mode 100644
index 4c8ad9e43706..000000000000
--- a/Documentation/misc-devices/mic/scif_overview.rst
+++ /dev/null
@@ -1,108 +0,0 @@
-========================================
-Symmetric Communication Interface (SCIF)
-========================================
-
-The Symmetric Communication Interface (SCIF (pronounced as skiff)) is a low
-level communications API across PCIe currently implemented for MIC. Currently
-SCIF provides inter-node communication within a single host platform, where a
-node is a MIC Coprocessor or Xeon based host. SCIF abstracts the details of
-communicating over the PCIe bus while providing an API that is symmetric
-across all the nodes in the PCIe network. An important design objective for SCIF
-is to deliver the maximum possible performance given the communication
-abilities of the hardware. SCIF has been used to implement an offload compiler
-runtime and OFED support for MPI implementations for MIC coprocessors.
-
-SCIF API Components
-===================
-
-The SCIF API has the following parts:
-
-1. Connection establishment using a client server model
-2. Byte stream messaging intended for short messages
-3. Node enumeration to determine online nodes
-4. Poll semantics for detection of incoming connections and messages
-5. Memory registration to pin down pages
-6. Remote memory mapping for low latency CPU accesses via mmap
-7. Remote DMA (RDMA) for high bandwidth DMA transfers
-8. Fence APIs for RDMA synchronization
-
-SCIF exposes the notion of a connection which can be used by peer processes on
-nodes in a SCIF PCIe "network" to share memory "windows" and to communicate. A
-process in a SCIF node initiates a SCIF connection to a peer process on a
-different node via a SCIF "endpoint". SCIF endpoints support messaging APIs
-which are similar to connection oriented socket APIs. Connected SCIF endpoints
-can also register local memory which is followed by data transfer using either
-DMA, CPU copies or remote memory mapping via mmap. SCIF supports both user and
-kernel mode clients which are functionally equivalent.
-
-SCIF Performance for MIC
-========================
-
-DMA bandwidth comparison between the TCP (over ethernet over PCIe) stack versus
-SCIF shows the performance advantages of SCIF for HPC applications and
-runtimes::
-
-             Comparison of TCP and SCIF based BW
-
-  Throughput (GB/sec)
-    8 +                                             PCIe Bandwidth ******
-      +                                                        TCP ######
-    7 +    **************************************             SCIF %%%%%%
-      |                       %%%%%%%%%%%%%%%%%%%
-    6 +                   %%%%
-      |                 %%
-      |               %%%
-    5 +              %%
-      |            %%
-    4 +           %%
-      |          %%
-    3 +         %%
-      |        %
-    2 +      %%
-      |     %%
-      |    %
-    1 +
-      +    ######################################
-    0 +++---+++--+--+-+--+--+-++-+--+-++-+--+-++-+-
-      1       10     100      1000   10000   100000
-                   Transfer Size (KBytes)
-
-SCIF allows memory sharing via mmap(..) between processes on different PCIe
-nodes and thus provides bare-metal PCIe latency. The round trip SCIF mmap
-latency from the host to an x100 MIC for an 8 byte message is 0.44 usecs.
-
-SCIF has a user space library which is a thin IOCTL wrapper providing a user
-space API similar to the kernel API in scif.h. The SCIF user space library
-is distributed @ https://software.intel.com/en-us/mic-developer
-
-Here is some pseudo code for an example of how two applications on two PCIe
-nodes would typically use the SCIF API::
-
-  Process A (on node A)			Process B (on node B)
-
-  /* get online node information */
-  scif_get_node_ids(..)			scif_get_node_ids(..)
-  scif_open(..)				scif_open(..)
-  scif_bind(..)				scif_bind(..)
-  scif_listen(..)
-  scif_accept(..)				scif_connect(..)
-  /* SCIF connection established */
-
-  /* Send and receive short messages */
-  scif_send(..)/scif_recv(..)		scif_send(..)/scif_recv(..)
-
-  /* Register memory */
-  scif_register(..)			scif_register(..)
-
-  /* RDMA */
-  scif_readfrom(..)/scif_writeto(..)	scif_readfrom(..)/scif_writeto(..)
-
-  /* Fence DMAs */
-  scif_fence_signal(..)			scif_fence_signal(..)
-
-  mmap(..)				mmap(..)
-
-  /* Access remote registered memory */
-
-  /* Close the endpoints */
-  scif_close(..)				scif_close(..)