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>

Documentation/misc-devices/mic/index.rst

-=============================================
-Intel Many Integrated Core (MIC) architecture
-=============================================
-
-.. toctree::
-    :maxdepth: 1
-
-    mic_overview
-    scif_overview
-
-.. only::  subproject and html
-
-   Indices
-   =======
-
-   * :ref:`genindex`

Documentation/misc-devices/mic/mic_overview.rst

-======================================================
-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                                 |
-             +-------------------------------------------------------------+

Documentation/misc-devices/mic/scif_overview.rst

-========================================
-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(..)

MAINTAINERS

@@ -8976,22 +8976,6 @@ S:	Supported
 W:	https://01.org/linux-acpi
 F:	drivers/platform/x86/intel_menlow.c
-INTEL MIC DRIVERS (mic)
-M:	Sudeep Dutt <sudeep.dutt@intel.com>
-M:	Ashutosh Dixit <ashutosh.dixit@intel.com>
-S:	Supported
-W:	https://github.com/sudeepdutt/mic
-W:	http://software.intel.com/en-us/mic-developer
-F:	Documentation/misc-devices/mic/
-F:	drivers/dma/mic_x100_dma.c
-F:	drivers/dma/mic_x100_dma.h
-F:	drivers/misc/mic/
-F:	include/linux/mic_bus.h
-F:	include/linux/scif.h
-F:	include/uapi/linux/mic_common.h
-F:	include/uapi/linux/mic_ioctl.h
-F:	include/uapi/linux/scif_ioctl.h
-
 INTEL P-Unit IPC DRIVER
 M:	Zha Qipeng <qipeng.zha@intel.com>
 L:	platform-driver-x86@vger.kernel.org

drivers/dma/Kconfig

@@ -318,24 +318,6 @@ config INTEL_IOP_ADMA
 	help
 	  Enable support for the Intel(R) IOP Series RAID engines.
 
-config INTEL_MIC_X100_DMA
-	tristate "Intel MIC X100 DMA Driver"
-	depends on 64BIT && X86 && INTEL_MIC_BUS
-	select DMA_ENGINE
-	help
-	  This enables DMA support for the Intel Many Integrated Core
-	  (MIC) family of PCIe form factor coprocessor X100 devices that
-	  run a 64 bit Linux OS. This driver will be used by both MIC
-	  host and card drivers.
-
-	  If you are building host kernel with a MIC device or a card
-	  kernel for a MIC device, then say M (recommended) or Y, else
-	  say N. If unsure say N.
-
-	  More information about the Intel MIC family as well as the Linux
-	  OS and tools for MIC to use with this driver are available from
-	  <http://software.intel.com/en-us/mic-developer>.
-
 config K3_DMA
 	tristate "Hisilicon K3 DMA support"
 	depends on ARCH_HI3xxx || ARCH_HISI || COMPILE_TEST

drivers/dma/Makefile

@@ -44,7 +44,6 @@ obj-$(CONFIG_INTEL_IDMA64) += idma64.o
 obj-$(CONFIG_INTEL_IOATDMA) += ioat/
 obj-$(CONFIG_INTEL_IDXD) += idxd/
 obj-$(CONFIG_INTEL_IOP_ADMA) += iop-adma.o
-obj-$(CONFIG_INTEL_MIC_X100_DMA) += mic_x100_dma.o
 obj-$(CONFIG_K3_DMA) += k3dma.o
 obj-$(CONFIG_LPC18XX_DMAMUX) += lpc18xx-dmamux.o
 obj-$(CONFIG_MILBEAUT_HDMAC) += milbeaut-hdmac.o

drivers/dma/mic_x100_dma.h

-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Intel MIC Platform Software Stack (MPSS)
- *
- * Copyright(c) 2014 Intel Corporation.
- *
- * Intel MIC X100 DMA Driver.
- *
- * Adapted from IOAT dma driver.
- */
-#ifndef _MIC_X100_DMA_H_
-#define _MIC_X100_DMA_H_
-
-#include <linux/kernel.h>
-#include <linux/delay.h>
-#include <linux/sched.h>
-#include <linux/debugfs.h>
-#include <linux/slab.h>
-#include <linux/interrupt.h>
-#include <linux/mic_bus.h>
-
-#include "dmaengine.h"
-
-/*
- * MIC has a total of 8 dma channels.
- * Four channels are assigned for host SW use & the remaining for MIC SW.
- * MIC DMA transfer size & addresses need to be 64 byte aligned.
- */
-#define MIC_DMA_MAX_NUM_CHAN	8
-#define MIC_DMA_NUM_CHAN	4
-#define MIC_DMA_ALIGN_SHIFT	DMAENGINE_ALIGN_64_BYTES
-#define MIC_DMA_ALIGN_BYTES	(1 << MIC_DMA_ALIGN_SHIFT)
-#define MIC_DMA_DESC_RX_SIZE	(128 * 1024 - 4)
-
-/*
- * Register descriptions
- * All the registers are 32 bit registers.
- * DCR is a global register and all others are per-channel.
- * DCR - bits 0, 2, 4, 6, 8, 10, 12, 14 - enable bits for channels 0 to 7
- *	 bits 1, 3, 5, 7, 9, 11, 13, 15 - owner bits for channels 0 to 7
- * DCAR - bit 24 & 25 interrupt masks for mic owned & host owned channels
- * DHPR - head of the descriptor ring updated by s/w
- * DTPR - tail of the descriptor ring updated by h/w
- * DRAR_LO - lower 32 bits of descriptor ring's mic address
- * DRAR_HI - 3:0 - remaining 4 bits of descriptor ring's mic address
- *	     20:4 descriptor ring size
- *	     25:21 mic smpt entry number
- * DSTAT - 16:0 h/w completion count; 31:28 dma engine status
- * DCHERR - this register is non-zero on error
- * DCHERRMSK - interrupt mask register
- */
-#define MIC_DMA_HW_CMP_CNT_MASK		0x1ffff
-#define MIC_DMA_CHAN_QUIESCE		0x20000000
-#define MIC_DMA_SBOX_BASE		0x00010000
-#define MIC_DMA_SBOX_DCR		0x0000A280
-#define MIC_DMA_SBOX_CH_BASE		0x0001A000
-#define MIC_DMA_SBOX_CHAN_OFF		0x40
-#define MIC_DMA_SBOX_DCAR_IM0		(0x1 << 24)
-#define MIC_DMA_SBOX_DCAR_IM1		(0x1 << 25)
-#define MIC_DMA_SBOX_DRARHI_SYS_MASK	(0x1 << 26)
-#define MIC_DMA_REG_DCAR		0
-#define MIC_DMA_REG_DHPR		4
-#define MIC_DMA_REG_DTPR		8
-#define MIC_DMA_REG_DRAR_LO		20
-#define MIC_DMA_REG_DRAR_HI		24
-#define MIC_DMA_REG_DSTAT		32
-#define MIC_DMA_REG_DCHERR		44
-#define MIC_DMA_REG_DCHERRMSK		48
-
-/* HW dma desc */
-struct mic_dma_desc {
-	u64 qw0;
-	u64 qw1;
-};
-
-enum mic_dma_chan_owner {
-	MIC_DMA_CHAN_MIC = 0,
-	MIC_DMA_CHAN_HOST
-};
-
-/*
- * mic_dma_chan - channel specific information
- * @ch_num: channel number
- * @owner: owner of this channel
- * @last_tail: cached value of descriptor ring tail
- * @head: index of next descriptor in desc_ring
- * @issued: hardware notification point
- * @submitted: index that will be used to submit descriptors to h/w
- * @api_ch: dma engine api channel
- * @desc_ring: dma descriptor ring
- * @desc_ring_micpa: mic physical address of desc_ring
- * @status_dest: destination for status (fence) descriptor
- * @status_dest_micpa: mic address for status_dest,
- *		       DMA controller uses this address
- * @tx_array: array of async_tx
- * @cleanup_lock: lock held when processing completed tx
- * @prep_lock: lock held in prep_memcpy & released in tx_submit
- * @issue_lock: lock used to synchronize writes to head
- * @cookie: mic_irq cookie used with mic irq request
- */
-struct mic_dma_chan {
-	int ch_num;
-	enum mic_dma_chan_owner owner;
-	u32 last_tail;
-	u32 head;
-	u32 issued;
-	u32 submitted;
-	struct dma_chan api_ch;
-	struct mic_dma_desc *desc_ring;
-	dma_addr_t desc_ring_micpa;
-	u64 *status_dest;
-	dma_addr_t status_dest_micpa;
-	struct dma_async_tx_descriptor *tx_array;
-	spinlock_t cleanup_lock;
-	spinlock_t prep_lock;
-	spinlock_t issue_lock;
-	struct mic_irq *cookie;
-};
-
-/*
- * struct mic_dma_device - per mic device
- * @mic_ch: dma channels
- * @dma_dev: underlying dma device
- * @mbdev: mic bus dma device
- * @mmio: virtual address of the mmio space
- * @dbg_dir: debugfs directory
- * @start_ch: first channel number that can be used
- * @max_xfer_size: maximum transfer size per dma descriptor
- */
-struct mic_dma_device {
-	struct mic_dma_chan mic_ch[MIC_DMA_MAX_NUM_CHAN];
-	struct dma_device dma_dev;
-	struct mbus_device *mbdev;
-	void __iomem *mmio;
-	struct dentry *dbg_dir;
-	int start_ch;
-	size_t max_xfer_size;
-};
-
-static inline struct mic_dma_chan *to_mic_dma_chan(struct dma_chan *ch)
-{
-	return container_of(ch, struct mic_dma_chan, api_ch);
-}
-
-static inline struct mic_dma_device *to_mic_dma_dev(struct mic_dma_chan *ch)
-{
-	return
-	container_of((const typeof(((struct mic_dma_device *)0)->mic_ch)*)
-		     (ch - ch->ch_num), struct mic_dma_device, mic_ch);
-}
-
-static inline struct mbus_device *to_mbus_device(struct mic_dma_chan *ch)
-{
-	return to_mic_dma_dev(ch)->mbdev;
-}
-
-static inline struct mbus_hw_ops *to_mbus_hw_ops(struct mic_dma_chan *ch)
-{
-	return to_mbus_device(ch)->hw_ops;
-}
-
-static inline struct device *mic_dma_ch_to_device(struct mic_dma_chan *ch)
-{
-	return to_mic_dma_dev(ch)->dma_dev.dev;
-}
-
-static inline void __iomem *mic_dma_chan_to_mmio(struct mic_dma_chan *ch)
-{
-	return to_mic_dma_dev(ch)->mmio;
-}
-
-static inline u32 mic_dma_read_reg(struct mic_dma_chan *ch, u32 reg)
-{
-	return ioread32(mic_dma_chan_to_mmio(ch) + MIC_DMA_SBOX_CH_BASE +
-			ch->ch_num * MIC_DMA_SBOX_CHAN_OFF + reg);
-}
-
-static inline void mic_dma_write_reg(struct mic_dma_chan *ch, u32 reg, u32 val)
-{
-	iowrite32(val, mic_dma_chan_to_mmio(ch) + MIC_DMA_SBOX_CH_BASE +
-		  ch->ch_num * MIC_DMA_SBOX_CHAN_OFF + reg);
-}
-
-static inline u32 mic_dma_mmio_read(struct mic_dma_chan *ch, u32 offset)
-{
-	return ioread32(mic_dma_chan_to_mmio(ch) + offset);
-}
-
-static inline void mic_dma_mmio_write(struct mic_dma_chan *ch, u32 val,
-				      u32 offset)
-{
-	iowrite32(val, mic_dma_chan_to_mmio(ch) + offset);
-}
-
-static inline u32 mic_dma_read_cmp_cnt(struct mic_dma_chan *ch)
-{
-	return mic_dma_read_reg(ch, MIC_DMA_REG_DSTAT) &
-	       MIC_DMA_HW_CMP_CNT_MASK;
-}
-
-static inline void mic_dma_chan_set_owner(struct mic_dma_chan *ch)
-{
-	u32 dcr = mic_dma_mmio_read(ch, MIC_DMA_SBOX_BASE + MIC_DMA_SBOX_DCR);
-	u32 chan_num = ch->ch_num;
-
-	dcr = (dcr & ~(0x1 << (chan_num * 2))) | (ch->owner << (chan_num * 2));
-	mic_dma_mmio_write(ch, dcr, MIC_DMA_SBOX_BASE + MIC_DMA_SBOX_DCR);
-}
-
-static inline void mic_dma_enable_chan(struct mic_dma_chan *ch)
-{
-	u32 dcr = mic_dma_mmio_read(ch, MIC_DMA_SBOX_BASE + MIC_DMA_SBOX_DCR);
-
-	dcr |= 2 << (ch->ch_num << 1);
-	mic_dma_mmio_write(ch, dcr, MIC_DMA_SBOX_BASE + MIC_DMA_SBOX_DCR);
-}
-
-static inline void mic_dma_disable_chan(struct mic_dma_chan *ch)
-{
-	u32 dcr = mic_dma_mmio_read(ch, MIC_DMA_SBOX_BASE + MIC_DMA_SBOX_DCR);
-
-	dcr &= ~(2 << (ch->ch_num << 1));
-	mic_dma_mmio_write(ch, dcr, MIC_DMA_SBOX_BASE + MIC_DMA_SBOX_DCR);
-}
-
-static void mic_dma_chan_set_desc_ring(struct mic_dma_chan *ch)
-{
-	u32 drar_hi;
-	dma_addr_t desc_ring_micpa = ch->desc_ring_micpa;
-
-	drar_hi = (MIC_DMA_DESC_RX_SIZE & 0x1ffff) << 4;
-	if (MIC_DMA_CHAN_MIC == ch->owner) {
-		drar_hi |= (desc_ring_micpa >> 32) & 0xf;
-	} else {
-		drar_hi |= MIC_DMA_SBOX_DRARHI_SYS_MASK;
-		drar_hi |= ((desc_ring_micpa >> 34)
-			    & 0x1f) << 21;
-		drar_hi |= (desc_ring_micpa >> 32) & 0x3;
-	}
-	mic_dma_write_reg(ch, MIC_DMA_REG_DRAR_LO, (u32) desc_ring_micpa);
-	mic_dma_write_reg(ch, MIC_DMA_REG_DRAR_HI, drar_hi);
-}
-
-static inline void mic_dma_chan_mask_intr(struct mic_dma_chan *ch)
-{
-	u32 dcar = mic_dma_read_reg(ch, MIC_DMA_REG_DCAR);
-
-	if (MIC_DMA_CHAN_MIC == ch->owner)
-		dcar |= MIC_DMA_SBOX_DCAR_IM0;
-	else
-		dcar |= MIC_DMA_SBOX_DCAR_IM1;
-	mic_dma_write_reg(ch, MIC_DMA_REG_DCAR, dcar);
-}
-
-static inline void mic_dma_chan_unmask_intr(struct mic_dma_chan *ch)
-{
-	u32 dcar = mic_dma_read_reg(ch, MIC_DMA_REG_DCAR);
-
-	if (MIC_DMA_CHAN_MIC == ch->owner)
-		dcar &= ~MIC_DMA_SBOX_DCAR_IM0;
-	else
-		dcar &= ~MIC_DMA_SBOX_DCAR_IM1;
-	mic_dma_write_reg(ch, MIC_DMA_REG_DCAR, dcar);
-}
-
-static void mic_dma_ack_interrupt(struct mic_dma_chan *ch)
-{
-	if (MIC_DMA_CHAN_MIC == ch->owner) {
-		/* HW errata */
-		mic_dma_chan_mask_intr(ch);
-		mic_dma_chan_unmask_intr(ch);
-	}
-	to_mbus_hw_ops(ch)->ack_interrupt(to_mbus_device(ch), ch->ch_num);
-}
-#endif

drivers/misc/Kconfig

@@ -474,7 +474,6 @@ source "drivers/misc/lis3lv02d/Kconfig"
 source "drivers/misc/altera-stapl/Kconfig"
 source "drivers/misc/mei/Kconfig"
 source "drivers/misc/vmw_vmci/Kconfig"
-source "drivers/misc/mic/Kconfig"
 source "drivers/misc/genwqe/Kconfig"
 source "drivers/misc/echo/Kconfig"
 source "drivers/misc/cxl/Kconfig"

drivers/misc/Makefile

@@ -46,7 +46,6 @@ obj-$(CONFIG_VMWARE_VMCI)	+= vmw_vmci/
 obj-$(CONFIG_LATTICE_ECP3_CONFIG)	+= lattice-ecp3-config.o
 obj-$(CONFIG_SRAM)		+= sram.o
 obj-$(CONFIG_SRAM_EXEC)		+= sram-exec.o
-obj-y				+= mic/
 obj-$(CONFIG_GENWQE)		+= genwqe/
 obj-$(CONFIG_ECHO)		+= echo/
 obj-$(CONFIG_CXL_BASE)		+= cxl/

drivers/misc/mic/Kconfig

-# SPDX-License-Identifier: GPL-2.0-only
-menu "Intel MIC & related support"
-
-config INTEL_MIC_BUS
-	tristate "Intel MIC Bus Driver"
-	depends on 64BIT && PCI && X86
-	select DMA_OPS
-	help
-	  This option is selected by any driver which registers a
-	  device or driver on the MIC Bus, such as CONFIG_INTEL_MIC_HOST,
-	  CONFIG_INTEL_MIC_CARD, CONFIG_INTEL_MIC_X100_DMA etc.
-
-	  If you are building a host/card kernel with an Intel MIC device
-	  then say M (recommended) or Y, else say N. If unsure say N.
-
-	  More information about the Intel MIC family as well as the Linux
-	  OS and tools for MIC to use with this driver are available from
-	  <http://software.intel.com/en-us/mic-developer>.
-
-config SCIF_BUS
-	tristate "SCIF Bus Driver"
-	depends on 64BIT && PCI && X86
-	select DMA_OPS
-	help
-	  This option is selected by any driver which registers a
-	  device or driver on the SCIF Bus, such as CONFIG_INTEL_MIC_HOST
-	  and CONFIG_INTEL_MIC_CARD.
-
-	  If you are building a host/card kernel with an Intel MIC device
-	  then say M (recommended) or Y, else say N. If unsure say N.
-
-	  More information about the Intel MIC family as well as the Linux
-	  OS and tools for MIC to use with this driver are available from
-	  <http://software.intel.com/en-us/mic-developer>.
-
-config VOP_BUS
-	tristate "VOP Bus Driver"
-	depends on HAS_DMA
-	select DMA_OPS
-	help
-	  This option is selected by any driver which registers a
-	  device or driver on the VOP Bus, such as CONFIG_INTEL_MIC_HOST
-	  and CONFIG_INTEL_MIC_CARD.
-
-	  If you are building a host/card kernel with an Intel MIC device
-	  then say M (recommended) or Y, else say N. If unsure say N.
-
-	  More information about the Intel MIC family as well as the Linux
-	  OS and tools for MIC to use with this driver are available from
-	  <http://software.intel.com/en-us/mic-developer>.
-
-config INTEL_MIC_HOST
-	tristate "Intel MIC Host Driver"
-	depends on 64BIT && PCI && X86
-	depends on INTEL_MIC_BUS && SCIF_BUS && MIC_COSM && VOP_BUS
-	select DMA_OPS
-	help
-	  This enables Host Driver support for the Intel Many Integrated
-	  Core (MIC) family of PCIe form factor coprocessor devices that
-	  run a 64 bit Linux OS. The driver manages card OS state and
-	  enables communication between host and card. Intel MIC X100
-	  devices are currently supported.
-
-	  If you are building a host kernel with an Intel MIC device then
-	  say M (recommended) or Y, else say N. If unsure say N.
-
-	  More information about the Intel MIC family as well as the Linux
-	  OS and tools for MIC to use with this driver are available from
-	  <http://software.intel.com/en-us/mic-developer>.
-
-config INTEL_MIC_CARD
-	tristate "Intel MIC Card Driver"
-	depends on 64BIT && X86
-	depends on INTEL_MIC_BUS && SCIF_BUS && MIC_COSM && VOP_BUS
-	select VIRTIO
-	help
-	  This enables card driver support for the Intel Many Integrated
-	  Core (MIC) device family. The card driver communicates shutdown/
-	  crash events to the host and allows registration/configuration of
-	  virtio devices. Intel MIC X100 devices are currently supported.
-
-	  If you are building a card kernel for an Intel MIC device then
-	  say M (recommended) or Y, else say N. If unsure say N.
-
-	  For more information see
-	  <http://software.intel.com/en-us/mic-developer>.
-
-config SCIF
-	tristate "SCIF Driver"
-	depends on 64BIT && PCI && X86 && SCIF_BUS && IOMMU_SUPPORT
-	select IOMMU_IOVA
-	help
-	  This enables SCIF Driver support for the Intel Many Integrated
-	  Core (MIC) family of PCIe form factor coprocessor devices that
-	  run a 64 bit Linux OS. The Symmetric Communication Interface
-	  (SCIF (pronounced as skiff)) is a low level communications API
-	  across PCIe currently implemented for MIC.
-
-	  If you are building a host kernel with an Intel MIC device then
-	  say M (recommended) or Y, else say N. If unsure say N.
-
-	  More information about the Intel MIC family as well as the Linux
-	  OS and tools for MIC to use with this driver are available from
-	  <http://software.intel.com/en-us/mic-developer>.
-
-config MIC_COSM
-	tristate "Intel MIC Coprocessor State Management (COSM) Drivers"
-	depends on 64BIT && PCI && X86 && SCIF
-	help
-	  This enables COSM driver support for the Intel Many
-	  Integrated Core (MIC) family of PCIe form factor coprocessor
-	  devices. COSM drivers implement functions such as boot,
-	  shutdown, reset and reboot of MIC devices.
-
-	  If you are building a host kernel with an Intel MIC device then
-	  say M (recommended) or Y, else say N. If unsure say N.
-
-	  More information about the Intel MIC family as well as the Linux
-	  OS and tools for MIC to use with this driver are available from
-	  <http://software.intel.com/en-us/mic-developer>.
-
-config VOP
-	tristate "VOP Driver"
-	depends on VOP_BUS
-	select VHOST_RING
-	select VIRTIO
-	help
-	  This enables VOP (Virtio over PCIe) Driver support for the Intel
-	  Many Integrated Core (MIC) family of PCIe form factor coprocessor
-	  devices. The VOP driver allows virtio drivers, e.g. net, console
-	  and block drivers, on the card connect to user space virtio
-	  devices on the host.
-
-	  If you are building a host kernel with an Intel MIC device then
-	  say M (recommended) or Y, else say N. If unsure say N.
-
-	  More information about the Intel MIC family as well as the Linux
-	  OS and tools for MIC to use with this driver are available from
-	  <http://software.intel.com/en-us/mic-developer>.
-
-endmenu

drivers/misc/mic/Makefile

-# SPDX-License-Identifier: GPL-2.0
-#
-# Makefile - Intel MIC Linux driver.
-# Copyright(c) 2013, Intel Corporation.
-#
-obj-$(CONFIG_INTEL_MIC_HOST) += host/
-obj-$(CONFIG_INTEL_MIC_CARD) += card/
-obj-y += bus/
-obj-$(CONFIG_SCIF) += scif/
-obj-$(CONFIG_MIC_COSM) += cosm/
-obj-$(CONFIG_MIC_COSM) += cosm_client/
-obj-$(CONFIG_VOP) += vop/

drivers/misc/mic/bus/Makefile

-# SPDX-License-Identifier: GPL-2.0-only
-#
-# Makefile - Intel MIC Linux driver.
-# Copyright(c) 2014, Intel Corporation.
-#
-obj-$(CONFIG_INTEL_MIC_BUS) += mic_bus.o
-obj-$(CONFIG_SCIF_BUS) += scif_bus.o
-obj-$(CONFIG_MIC_COSM) += cosm_bus.o
-obj-$(CONFIG_VOP_BUS) += vop_bus.o

drivers/misc/mic/bus/cosm_bus.c

-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Intel MIC Platform Software Stack (MPSS)
- *
- * Copyright(c) 2015 Intel Corporation.
- *
- * Intel MIC COSM Bus Driver
- */
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/idr.h>
-#include "cosm_bus.h"
-
-/* Unique numbering for cosm devices. */
-static DEFINE_IDA(cosm_index_ida);
-
-static int cosm_dev_probe(struct device *d)
-{
-	struct cosm_device *dev = dev_to_cosm(d);
-	struct cosm_driver *drv = drv_to_cosm(dev->dev.driver);
-
-	return drv->probe(dev);
-}
-
-static int cosm_dev_remove(struct device *d)
-{
-	struct cosm_device *dev = dev_to_cosm(d);
-	struct cosm_driver *drv = drv_to_cosm(dev->dev.driver);
-
-	drv->remove(dev);
-	return 0;
-}
-
-static struct bus_type cosm_bus = {
-	.name  = "cosm_bus",
-	.probe = cosm_dev_probe,
-	.remove = cosm_dev_remove,
-};
-
-int cosm_register_driver(struct cosm_driver *driver)
-{
-	driver->driver.bus = &cosm_bus;
-	return driver_register(&driver->driver);
-}
-EXPORT_SYMBOL_GPL(cosm_register_driver);
-
-void cosm_unregister_driver(struct cosm_driver *driver)
-{
-	driver_unregister(&driver->driver);
-}
-EXPORT_SYMBOL_GPL(cosm_unregister_driver);
-
-static inline void cosm_release_dev(struct device *d)
-{
-	struct cosm_device *cdev = dev_to_cosm(d);
-
-	kfree(cdev);
-}
-
-struct cosm_device *
-cosm_register_device(struct device *pdev, struct cosm_hw_ops *hw_ops)
-{
-	struct cosm_device *cdev;
-	int ret;
-
-	cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
-	if (!cdev)
-		return ERR_PTR(-ENOMEM);
-
-	cdev->dev.parent = pdev;
-	cdev->dev.release = cosm_release_dev;
-	cdev->hw_ops = hw_ops;
-	dev_set_drvdata(&cdev->dev, cdev);
-	cdev->dev.bus = &cosm_bus;
-
-	/* Assign a unique device index and hence name */
-	ret = ida_simple_get(&cosm_index_ida, 0, 0, GFP_KERNEL);
-	if (ret < 0)
-		goto free_cdev;
-
-	cdev->index = ret;
-	cdev->dev.id = ret;
-	dev_set_name(&cdev->dev, "cosm-dev%u", cdev->index);
-
-	ret = device_register(&cdev->dev);
-	if (ret)
-		goto ida_remove;
-	return cdev;
-ida_remove:
-	ida_simple_remove(&cosm_index_ida, cdev->index);
-free_cdev:
-	put_device(&cdev->dev);
-	return ERR_PTR(ret);
-}
-EXPORT_SYMBOL_GPL(cosm_register_device);
-
-void cosm_unregister_device(struct cosm_device *dev)
-{
-	int index = dev->index; /* save for after device release */
-
-	device_unregister(&dev->dev);
-	ida_simple_remove(&cosm_index_ida, index);
-}
-EXPORT_SYMBOL_GPL(cosm_unregister_device);
-
-struct cosm_device *cosm_find_cdev_by_id(int id)
-{
-	struct device *dev = subsys_find_device_by_id(&cosm_bus, id, NULL);
-
-	return dev ? container_of(dev, struct cosm_device, dev) : NULL;
-}
-EXPORT_SYMBOL_GPL(cosm_find_cdev_by_id);
-
-static int __init cosm_init(void)
-{
-	return bus_register(&cosm_bus);
-}
-
-static void __exit cosm_exit(void)
-{
-	bus_unregister(&cosm_bus);
-	ida_destroy(&cosm_index_ida);
-}
-
-core_initcall(cosm_init);
-module_exit(cosm_exit);
-
-MODULE_AUTHOR("Intel Corporation");
-MODULE_DESCRIPTION("Intel(R) MIC card OS state management bus driver");
-MODULE_LICENSE("GPL v2");

drivers/misc/mic/bus/cosm_bus.h

-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Intel MIC Platform Software Stack (MPSS)
- *
- * Copyright(c) 2015 Intel Corporation.
- *
- * Intel MIC COSM Bus Driver
- */
-#ifndef _COSM_BUS_H_
-#define _COSM_BUS_H_
-
-#include <linux/scif.h>
-#include <linux/mic_common.h>
-#include "../common/mic_dev.h"
-
-/**
- * cosm_device - representation of a cosm device
- *
- * @attr_group: Pointer to list of sysfs attribute groups.
- * @sdev: Device for sysfs entries.
- * @state: MIC state.
- * @prev_state: MIC state previous to MIC_RESETTING
- * @shutdown_status: MIC status reported by card for shutdown/crashes.
- * @shutdown_status_int: Internal shutdown status maintained by the driver
- * @cosm_mutex: Mutex for synchronizing access to data structures.
- * @reset_trigger_work: Work for triggering reset requests.
- * @scif_work: Work for handling per device SCIF connections
- * @cmdline: Kernel command line.
- * @firmware: Firmware file name.
- * @ramdisk: Ramdisk file name.
- * @bootmode: Boot mode i.e. "linux" or "elf" for flash updates.
- * @log_buf_addr: Log buffer address for MIC.
- * @log_buf_len: Log buffer length address for MIC.
- * @state_sysfs: Sysfs dirent for notifying ring 3 about MIC state changes.
- * @hw_ops: the hardware bus ops for this device.
- * @dev: underlying device.
- * @index: unique position on the cosm bus
- * @dbg_dir: debug fs directory
- * @newepd: new endpoint from scif accept to be assigned to this cdev
- * @epd: SCIF endpoint for this cdev
- * @heartbeat_watchdog_enable: if heartbeat watchdog is enabled for this cdev
- * @sysfs_heartbeat_enable: sysfs setting for disabling heartbeat notification
- */
-struct cosm_device {
-	const struct attribute_group **attr_group;
-	struct device *sdev;
-	u8 state;
-	u8 prev_state;
-	u8 shutdown_status;
-	u8 shutdown_status_int;
-	struct mutex cosm_mutex;
-	struct work_struct reset_trigger_work;
-	struct work_struct scif_work;
-	char *cmdline;
-	char *firmware;
-	char *ramdisk;
-	char *bootmode;
-	void *log_buf_addr;
-	int *log_buf_len;
-	struct kernfs_node *state_sysfs;
-	struct cosm_hw_ops *hw_ops;
-	struct device dev;
-	int index;
-	struct dentry *dbg_dir;
-	scif_epd_t newepd;
-	scif_epd_t epd;
-	bool heartbeat_watchdog_enable;
-	bool sysfs_heartbeat_enable;
-};
-
-/**
- * cosm_driver - operations for a cosm driver
- *
- * @driver: underlying device driver (populate name and owner).
- * @probe: the function to call when a device is found.  Returns 0 or -errno.
- * @remove: the function to call when a device is removed.
- */
-struct cosm_driver {
-	struct device_driver driver;
-	int (*probe)(struct cosm_device *dev);
-	void (*remove)(struct cosm_device *dev);
-};
-
-/**
- * cosm_hw_ops - cosm bus ops
- *
- * @reset: trigger MIC reset
- * @force_reset: force MIC reset
- * @post_reset: inform MIC reset is complete
- * @ready: is MIC ready for OS download
- * @start: boot MIC
- * @stop: prepare MIC for reset
- * @family: return MIC HW family string
- * @stepping: return MIC HW stepping string
- * @aper: return MIC PCIe aperture
- */
-struct cosm_hw_ops {
-	void (*reset)(struct cosm_device *cdev);
-	void (*force_reset)(struct cosm_device *cdev);
-	void (*post_reset)(struct cosm_device *cdev, enum mic_states state);
-	bool (*ready)(struct cosm_device *cdev);
-	int (*start)(struct cosm_device *cdev, int id);
-	void (*stop)(struct cosm_device *cdev, bool force);
-	ssize_t (*family)(struct cosm_device *cdev, char *buf);
-	ssize_t (*stepping)(struct cosm_device *cdev, char *buf);
-	struct mic_mw *(*aper)(struct cosm_device *cdev);
-};
-
-struct cosm_device *
-cosm_register_device(struct device *pdev, struct cosm_hw_ops *hw_ops);
-void cosm_unregister_device(struct cosm_device *dev);
-int cosm_register_driver(struct cosm_driver *drv);
-void cosm_unregister_driver(struct cosm_driver *drv);
-struct cosm_device *cosm_find_cdev_by_id(int id);
-
-static inline struct cosm_device *dev_to_cosm(struct device *dev)
-{
-	return container_of(dev, struct cosm_device, dev);
-}
-
-static inline struct cosm_driver *drv_to_cosm(struct device_driver *drv)
-{
-	return container_of(drv, struct cosm_driver, driver);
-}
-#endif /* _COSM_BUS_H */

drivers/misc/mic/bus/mic_bus.c

-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Intel MIC Platform Software Stack (MPSS)
- *
- * Copyright(c) 2014 Intel Corporation.
- *
- * Intel MIC Bus driver.
- *
- * This implementation is very similar to the the virtio bus driver
- * implementation @ drivers/virtio/virtio.c
- */
-#include <linux/dma-map-ops.h>
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/idr.h>
-#include <linux/mic_bus.h>
-
-static ssize_t device_show(struct device *d,
-			   struct device_attribute *attr, char *buf)
-{
-	struct mbus_device *dev = dev_to_mbus(d);
-	return sprintf(buf, "0x%04x\n", dev->id.device);
-}
-static DEVICE_ATTR_RO(device);
-
-static ssize_t vendor_show(struct device *d,
-			   struct device_attribute *attr, char *buf)
-{
-	struct mbus_device *dev = dev_to_mbus(d);
-	return sprintf(buf, "0x%04x\n", dev->id.vendor);
-}
-static DEVICE_ATTR_RO(vendor);
-
-static ssize_t modalias_show(struct device *d,
-			     struct device_attribute *attr, char *buf)
-{
-	struct mbus_device *dev = dev_to_mbus(d);
-	return sprintf(buf, "mbus:d%08Xv%08X\n",
-		       dev->id.device, dev->id.vendor);
-}
-static DEVICE_ATTR_RO(modalias);
-
-static struct attribute *mbus_dev_attrs[] = {
-	&dev_attr_device.attr,
-	&dev_attr_vendor.attr,
-	&dev_attr_modalias.attr,
-	NULL,
-};
-ATTRIBUTE_GROUPS(mbus_dev);
-
-static inline int mbus_id_match(const struct mbus_device *dev,
-				const struct mbus_device_id *id)
-{
-	if (id->device != dev->id.device && id->device != MBUS_DEV_ANY_ID)
-		return 0;
-
-	return id->vendor == MBUS_DEV_ANY_ID || id->vendor == dev->id.vendor;
-}
-
-/*
- * This looks through all the IDs a driver claims to support.  If any of them
- * match, we return 1 and the kernel will call mbus_dev_probe().
- */
-static int mbus_dev_match(struct device *dv, struct device_driver *dr)
-{
-	unsigned int i;
-	struct mbus_device *dev = dev_to_mbus(dv);
-	const struct mbus_device_id *ids;
-
-	ids = drv_to_mbus(dr)->id_table;
-	for (i = 0; ids[i].device; i++)
-		if (mbus_id_match(dev, &ids[i]))
-			return 1;
-	return 0;
-}
-
-static int mbus_uevent(struct device *dv, struct kobj_uevent_env *env)
-{
-	struct mbus_device *dev = dev_to_mbus(dv);
-
-	return add_uevent_var(env, "MODALIAS=mbus:d%08Xv%08X",
-			      dev->id.device, dev->id.vendor);
-}
-
-static int mbus_dev_probe(struct device *d)
-{
-	int err;
-	struct mbus_device *dev = dev_to_mbus(d);
-	struct mbus_driver *drv = drv_to_mbus(dev->dev.driver);
-
-	err = drv->probe(dev);
-	if (!err)
-		if (drv->scan)
-			drv->scan(dev);
-	return err;
-}
-
-static int mbus_dev_remove(struct device *d)
-{
-	struct mbus_device *dev = dev_to_mbus(d);
-	struct mbus_driver *drv = drv_to_mbus(dev->dev.driver);
-
-	drv->remove(dev);
-	return 0;
-}
-
-static struct bus_type mic_bus = {
-	.name  = "mic_bus",
-	.match = mbus_dev_match,
-	.dev_groups = mbus_dev_groups,
-	.uevent = mbus_uevent,
-	.probe = mbus_dev_probe,
-	.remove = mbus_dev_remove,
-};
-
-int mbus_register_driver(struct mbus_driver *driver)
-{
-	driver->driver.bus = &mic_bus;
-	return driver_register(&driver->driver);
-}
-EXPORT_SYMBOL_GPL(mbus_register_driver);
-
-void mbus_unregister_driver(struct mbus_driver *driver)
-{
-	driver_unregister(&driver->driver);
-}
-EXPORT_SYMBOL_GPL(mbus_unregister_driver);
-
-static void mbus_release_dev(struct device *d)
-{
-	struct mbus_device *mbdev = dev_to_mbus(d);
-	kfree(mbdev);
-}
-
-struct mbus_device *
-mbus_register_device(struct device *pdev, int id, const struct dma_map_ops *dma_ops,
-		     struct mbus_hw_ops *hw_ops, int index,
-		     void __iomem *mmio_va)
-{
-	int ret;
-	struct mbus_device *mbdev;
-
-	mbdev = kzalloc(sizeof(*mbdev), GFP_KERNEL);
-	if (!mbdev)
-		return ERR_PTR(-ENOMEM);
-
-	mbdev->mmio_va = mmio_va;
-	mbdev->dev.parent = pdev;
-	mbdev->id.device = id;
-	mbdev->id.vendor = MBUS_DEV_ANY_ID;
-	mbdev->dev.dma_ops = dma_ops;
-	mbdev->dev.dma_mask = &mbdev->dev.coherent_dma_mask;
-	dma_set_mask(&mbdev->dev, DMA_BIT_MASK(64));
-	mbdev->dev.release = mbus_release_dev;
-	mbdev->hw_ops = hw_ops;
-	mbdev->dev.bus = &mic_bus;
-	mbdev->index = index;
-	dev_set_name(&mbdev->dev, "mbus-dev%u", mbdev->index);
-	/*
-	 * device_register() causes the bus infrastructure to look for a
-	 * matching driver.
-	 */
-	ret = device_register(&mbdev->dev);
-	if (ret)
-		goto free_mbdev;
-	return mbdev;
-free_mbdev:
-	put_device(&mbdev->dev);
-	return ERR_PTR(ret);
-}
-EXPORT_SYMBOL_GPL(mbus_register_device);
-
-void mbus_unregister_device(struct mbus_device *mbdev)
-{
-	device_unregister(&mbdev->dev);
-}
-EXPORT_SYMBOL_GPL(mbus_unregister_device);
-
-static int __init mbus_init(void)
-{
-	return bus_register(&mic_bus);
-}
-
-static void __exit mbus_exit(void)
-{
-	bus_unregister(&mic_bus);
-}
-
-core_initcall(mbus_init);
-module_exit(mbus_exit);
-
-MODULE_AUTHOR("Intel Corporation");
-MODULE_DESCRIPTION("Intel(R) MIC Bus driver");
-MODULE_LICENSE("GPL v2");

drivers/misc/mic/bus/scif_bus.c

-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Intel MIC Platform Software Stack (MPSS)
- *
- * Copyright(c) 2014 Intel Corporation.
- *
- * Intel Symmetric Communications Interface Bus driver.
- */
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/idr.h>
-#include <linux/dma-map-ops.h>
-
-#include "scif_bus.h"
-
-static ssize_t device_show(struct device *d,
-			   struct device_attribute *attr, char *buf)
-{
-	struct scif_hw_dev *dev = dev_to_scif(d);
-
-	return sprintf(buf, "0x%04x\n", dev->id.device);
-}
-static DEVICE_ATTR_RO(device);
-
-static ssize_t vendor_show(struct device *d,
-			   struct device_attribute *attr, char *buf)
-{
-	struct scif_hw_dev *dev = dev_to_scif(d);
-
-	return sprintf(buf, "0x%04x\n", dev->id.vendor);
-}
-static DEVICE_ATTR_RO(vendor);
-
-static ssize_t modalias_show(struct device *d,
-			     struct device_attribute *attr, char *buf)
-{
-	struct scif_hw_dev *dev = dev_to_scif(d);
-
-	return sprintf(buf, "scif:d%08Xv%08X\n",
-		       dev->id.device, dev->id.vendor);
-}
-static DEVICE_ATTR_RO(modalias);
-
-static struct attribute *scif_dev_attrs[] = {
-	&dev_attr_device.attr,
-	&dev_attr_vendor.attr,
-	&dev_attr_modalias.attr,
-	NULL,
-};
-ATTRIBUTE_GROUPS(scif_dev);
-
-static inline int scif_id_match(const struct scif_hw_dev *dev,
-				const struct scif_hw_dev_id *id)
-{
-	if (id->device != dev->id.device && id->device != SCIF_DEV_ANY_ID)
-		return 0;
-
-	return id->vendor == SCIF_DEV_ANY_ID || id->vendor == dev->id.vendor;
-}
-
-/*
- * This looks through all the IDs a driver claims to support.  If any of them
- * match, we return 1 and the kernel will call scif_dev_probe().
- */
-static int scif_dev_match(struct device *dv, struct device_driver *dr)
-{
-	unsigned int i;
-	struct scif_hw_dev *dev = dev_to_scif(dv);
-	const struct scif_hw_dev_id *ids;
-
-	ids = drv_to_scif(dr)->id_table;
-	for (i = 0; ids[i].device; i++)
-		if (scif_id_match(dev, &ids[i]))
-			return 1;
-	return 0;
-}
-
-static int scif_uevent(struct device *dv, struct kobj_uevent_env *env)
-{
-	struct scif_hw_dev *dev = dev_to_scif(dv);
-
-	return add_uevent_var(env, "MODALIAS=scif:d%08Xv%08X",
-			      dev->id.device, dev->id.vendor);
-}
-
-static int scif_dev_probe(struct device *d)
-{
-	struct scif_hw_dev *dev = dev_to_scif(d);
-	struct scif_driver *drv = drv_to_scif(dev->dev.driver);
-
-	return drv->probe(dev);
-}
-
-static int scif_dev_remove(struct device *d)
-{
-	struct scif_hw_dev *dev = dev_to_scif(d);
-	struct scif_driver *drv = drv_to_scif(dev->dev.driver);
-
-	drv->remove(dev);
-	return 0;
-}
-
-static struct bus_type scif_bus = {
-	.name  = "scif_bus",
-	.match = scif_dev_match,
-	.dev_groups = scif_dev_groups,
-	.uevent = scif_uevent,
-	.probe = scif_dev_probe,
-	.remove = scif_dev_remove,
-};
-
-int scif_register_driver(struct scif_driver *driver)
-{
-	driver->driver.bus = &scif_bus;
-	return driver_register(&driver->driver);
-}
-EXPORT_SYMBOL_GPL(scif_register_driver);
-
-void scif_unregister_driver(struct scif_driver *driver)
-{
-	driver_unregister(&driver->driver);
-}
-EXPORT_SYMBOL_GPL(scif_unregister_driver);
-
-static void scif_release_dev(struct device *d)
-{
-	struct scif_hw_dev *sdev = dev_to_scif(d);
-
-	kfree(sdev);
-}
-
-struct scif_hw_dev *
-scif_register_device(struct device *pdev, int id, const struct dma_map_ops *dma_ops,
-		     struct scif_hw_ops *hw_ops, u8 dnode, u8 snode,
-		     struct mic_mw *mmio, struct mic_mw *aper, void *dp,
-		     void __iomem *rdp, struct dma_chan **chan, int num_chan,
-		     bool card_rel_da)
-{
-	int ret;
-	struct scif_hw_dev *sdev;
-
-	sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);
-	if (!sdev)
-		return ERR_PTR(-ENOMEM);
-
-	sdev->dev.parent = pdev;
-	sdev->id.device = id;
-	sdev->id.vendor = SCIF_DEV_ANY_ID;
-	sdev->dev.dma_ops = dma_ops;
-	sdev->dev.release = scif_release_dev;
-	sdev->hw_ops = hw_ops;
-	sdev->dnode = dnode;
-	sdev->snode = snode;
-	dev_set_drvdata(&sdev->dev, sdev);
-	sdev->dev.bus = &scif_bus;
-	sdev->mmio = mmio;
-	sdev->aper = aper;
-	sdev->dp = dp;
-	sdev->rdp = rdp;
-	sdev->dev.dma_mask = &sdev->dev.coherent_dma_mask;
-	dma_set_mask(&sdev->dev, DMA_BIT_MASK(64));
-	sdev->dma_ch = chan;
-	sdev->num_dma_ch = num_chan;
-	sdev->card_rel_da = card_rel_da;
-	dev_set_name(&sdev->dev, "scif-dev%u", sdev->dnode);
-	/*
-	 * device_register() causes the bus infrastructure to look for a
-	 * matching driver.
-	 */
-	ret = device_register(&sdev->dev);
-	if (ret)
-		goto free_sdev;
-	return sdev;
-free_sdev:
-	put_device(&sdev->dev);
-	return ERR_PTR(ret);
-}
-EXPORT_SYMBOL_GPL(scif_register_device);
-
-void scif_unregister_device(struct scif_hw_dev *sdev)
-{
-	device_unregister(&sdev->dev);
-}
-EXPORT_SYMBOL_GPL(scif_unregister_device);
-
-static int __init scif_init(void)
-{
-	return bus_register(&scif_bus);
-}
-
-static void __exit scif_exit(void)
-{
-	bus_unregister(&scif_bus);
-}
-
-core_initcall(scif_init);
-module_exit(scif_exit);
-
-MODULE_AUTHOR("Intel Corporation");
-MODULE_DESCRIPTION("Intel(R) SCIF Bus driver");
-MODULE_LICENSE("GPL v2");

drivers/misc/mic/bus/scif_bus.h

-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Intel MIC Platform Software Stack (MPSS)
- *
- * Copyright(c) 2014 Intel Corporation.
- *
- * Intel Symmetric Communications Interface Bus driver.
- */
-#ifndef _SCIF_BUS_H_
-#define _SCIF_BUS_H_
-/*
- * Everything a scif driver needs to work with any particular scif
- * hardware abstraction layer.
- */
-#include <linux/dma-map-ops.h>
-
-#include <linux/mic_common.h>
-#include "../common/mic_dev.h"
-
-struct scif_hw_dev_id {
-	u32 device;
-	u32 vendor;
-};
-
-#define MIC_SCIF_DEV 1
-#define SCIF_DEV_ANY_ID 0xffffffff
-
-/**
- * scif_hw_dev - representation of a hardware device abstracted for scif
- * @hw_ops: the hardware ops supported by this device
- * @id: the device type identification (used to match it with a driver)
- * @mmio: MMIO memory window
- * @aper: Aperture memory window
- * @dev: underlying device
- * @dnode - The destination node which this device will communicate with.
- * @snode - The source node for this device.
- * @dp - Self device page
- * @rdp - Remote device page
- * @dma_ch - Array of DMA channels
- * @num_dma_ch - Number of DMA channels available
- * @card_rel_da - Set to true if DMA addresses programmed in the DMA engine
- *		are relative to the card point of view
- */
-struct scif_hw_dev {
-	struct scif_hw_ops *hw_ops;
-	struct scif_hw_dev_id id;
-	struct mic_mw *mmio;
-	struct mic_mw *aper;
-	struct device dev;
-	u8 dnode;
-	u8 snode;
-	void *dp;
-	void __iomem *rdp;
-	struct dma_chan **dma_ch;
-	int num_dma_ch;
-	bool card_rel_da;
-};
-
-/**
- * scif_driver - operations for a scif I/O driver
- * @driver: underlying device driver (populate name and owner).
- * @id_table: the ids serviced by this driver.
- * @probe: the function to call when a device is found.  Returns 0 or -errno.
- * @remove: the function to call when a device is removed.
- */
-struct scif_driver {
-	struct device_driver driver;
-	const struct scif_hw_dev_id *id_table;
-	int (*probe)(struct scif_hw_dev *dev);
-	void (*remove)(struct scif_hw_dev *dev);
-};
-
-/**
- * scif_hw_ops - Hardware operations for accessing a SCIF device on the SCIF bus.
- *
- * @next_db: Obtain the next available doorbell.
- * @request_irq: Request an interrupt on a particular doorbell.
- * @free_irq: Free an interrupt requested previously.
- * @ack_interrupt: acknowledge an interrupt in the ISR.
- * @send_intr: Send an interrupt to the remote node on a specified doorbell.
- * @send_p2p_intr: Send an interrupt to the peer node on a specified doorbell
- * which is specifically targeted for a peer to peer node.
- * @remap: Map a buffer with the specified physical address and length.
- * @unmap: Unmap a buffer previously mapped.
- */
-struct scif_hw_ops {
-	int (*next_db)(struct scif_hw_dev *sdev);
-	struct mic_irq * (*request_irq)(struct scif_hw_dev *sdev,
-					irqreturn_t (*func)(int irq,
-							    void *data),
-					const char *name, void *data,
-					int db);
-	void (*free_irq)(struct scif_hw_dev *sdev,
-			 struct mic_irq *cookie, void *data);
-	void (*ack_interrupt)(struct scif_hw_dev *sdev, int num);
-	void (*send_intr)(struct scif_hw_dev *sdev, int db);
-	void (*send_p2p_intr)(struct scif_hw_dev *sdev, int db,
-			      struct mic_mw *mw);
-	void __iomem * (*remap)(struct scif_hw_dev *sdev,
-				  phys_addr_t pa, size_t len);
-	void (*unmap)(struct scif_hw_dev *sdev, void __iomem *va);
-};
-
-int scif_register_driver(struct scif_driver *driver);
-void scif_unregister_driver(struct scif_driver *driver);
-struct scif_hw_dev *
-scif_register_device(struct device *pdev, int id,
-		     const struct dma_map_ops *dma_ops,
-		     struct scif_hw_ops *hw_ops, u8 dnode, u8 snode,
-		     struct mic_mw *mmio, struct mic_mw *aper,
-		     void *dp, void __iomem *rdp,
-		     struct dma_chan **chan, int num_chan,
-		     bool card_rel_da);
-void scif_unregister_device(struct scif_hw_dev *sdev);
-
-static inline struct scif_hw_dev *dev_to_scif(struct device *dev)
-{
-	return container_of(dev, struct scif_hw_dev, dev);
-}
-
-static inline struct scif_driver *drv_to_scif(struct device_driver *drv)
-{
-	return container_of(drv, struct scif_driver, driver);
-}
-#endif /* _SCIF_BUS_H */

drivers/misc/mic/bus/vop_bus.c

-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Intel MIC Platform Software Stack (MPSS)
- *
- * Copyright(c) 2016 Intel Corporation.
- *
- * Intel Virtio Over PCIe (VOP) Bus driver.
- */
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/idr.h>
-#include <linux/dma-map-ops.h>
-
-#include "vop_bus.h"
-
-static ssize_t device_show(struct device *d,
-			   struct device_attribute *attr, char *buf)
-{
-	struct vop_device *dev = dev_to_vop(d);
-
-	return sprintf(buf, "0x%04x\n", dev->id.device);
-}
-static DEVICE_ATTR_RO(device);
-
-static ssize_t vendor_show(struct device *d,
-			   struct device_attribute *attr, char *buf)
-{
-	struct vop_device *dev = dev_to_vop(d);
-
-	return sprintf(buf, "0x%04x\n", dev->id.vendor);
-}
-static DEVICE_ATTR_RO(vendor);
-
-static ssize_t modalias_show(struct device *d,
-			     struct device_attribute *attr, char *buf)
-{
-	struct vop_device *dev = dev_to_vop(d);
-
-	return sprintf(buf, "vop:d%08Xv%08X\n",
-		       dev->id.device, dev->id.vendor);
-}
-static DEVICE_ATTR_RO(modalias);
-
-static struct attribute *vop_dev_attrs[] = {
-	&dev_attr_device.attr,
-	&dev_attr_vendor.attr,
-	&dev_attr_modalias.attr,
-	NULL,
-};
-ATTRIBUTE_GROUPS(vop_dev);
-
-static inline int vop_id_match(const struct vop_device *dev,
-			       const struct vop_device_id *id)
-{
-	if (id->device != dev->id.device && id->device != VOP_DEV_ANY_ID)
-		return 0;
-
-	return id->vendor == VOP_DEV_ANY_ID || id->vendor == dev->id.vendor;
-}
-
-/*
- * This looks through all the IDs a driver claims to support.  If any of them
- * match, we return 1 and the kernel will call vop_dev_probe().
- */
-static int vop_dev_match(struct device *dv, struct device_driver *dr)
-{
-	unsigned int i;
-	struct vop_device *dev = dev_to_vop(dv);
-	const struct vop_device_id *ids;
-
-	ids = drv_to_vop(dr)->id_table;
-	for (i = 0; ids[i].device; i++)
-		if (vop_id_match(dev, &ids[i]))
-			return 1;
-	return 0;
-}
-
-static int vop_uevent(struct device *dv, struct kobj_uevent_env *env)
-{
-	struct vop_device *dev = dev_to_vop(dv);
-
-	return add_uevent_var(env, "MODALIAS=vop:d%08Xv%08X",
-			      dev->id.device, dev->id.vendor);
-}
-
-static int vop_dev_probe(struct device *d)
-{
-	struct vop_device *dev = dev_to_vop(d);
-	struct vop_driver *drv = drv_to_vop(dev->dev.driver);
-
-	return drv->probe(dev);
-}
-
-static int vop_dev_remove(struct device *d)
-{
-	struct vop_device *dev = dev_to_vop(d);
-	struct vop_driver *drv = drv_to_vop(dev->dev.driver);
-
-	drv->remove(dev);
-	return 0;
-}
-
-static struct bus_type vop_bus = {
-	.name  = "vop_bus",
-	.match = vop_dev_match,
-	.dev_groups = vop_dev_groups,
-	.uevent = vop_uevent,
-	.probe = vop_dev_probe,
-	.remove = vop_dev_remove,
-};
-
-int vop_register_driver(struct vop_driver *driver)
-{
-	driver->driver.bus = &vop_bus;
-	return driver_register(&driver->driver);
-}
-EXPORT_SYMBOL_GPL(vop_register_driver);
-
-void vop_unregister_driver(struct vop_driver *driver)
-{
-	driver_unregister(&driver->driver);
-}
-EXPORT_SYMBOL_GPL(vop_unregister_driver);
-
-static void vop_release_dev(struct device *d)
-{
-	struct vop_device *dev = dev_to_vop(d);
-
-	kfree(dev);
-}
-
-struct vop_device *
-vop_register_device(struct device *pdev, int id,
-		    const struct dma_map_ops *dma_ops,
-		    struct vop_hw_ops *hw_ops, u8 dnode, struct mic_mw *aper,
-		    struct dma_chan *chan)
-{
-	int ret;
-	struct vop_device *vdev;
-
-	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
-	if (!vdev)
-		return ERR_PTR(-ENOMEM);
-
-	vdev->dev.parent = pdev;
-	vdev->id.device = id;
-	vdev->id.vendor = VOP_DEV_ANY_ID;
-	vdev->dev.dma_ops = dma_ops;
-	vdev->dev.dma_mask = &vdev->dev.coherent_dma_mask;
-	dma_set_mask(&vdev->dev, DMA_BIT_MASK(64));
-	vdev->dev.release = vop_release_dev;
-	vdev->hw_ops = hw_ops;
-	vdev->dev.bus = &vop_bus;
-	vdev->dnode = dnode;
-	vdev->aper = aper;
-	vdev->dma_ch = chan;
-	vdev->index = dnode - 1;
-	dev_set_name(&vdev->dev, "vop-dev%u", vdev->index);
-	/*
-	 * device_register() causes the bus infrastructure to look for a
-	 * matching driver.
-	 */
-	ret = device_register(&vdev->dev);
-	if (ret)
-		goto free_vdev;
-	return vdev;
-free_vdev:
-	put_device(&vdev->dev);
-	return ERR_PTR(ret);
-}
-EXPORT_SYMBOL_GPL(vop_register_device);
-
-void vop_unregister_device(struct vop_device *dev)
-{
-	device_unregister(&dev->dev);
-}
-EXPORT_SYMBOL_GPL(vop_unregister_device);
-
-static int __init vop_init(void)
-{
-	return bus_register(&vop_bus);
-}
-
-static void __exit vop_exit(void)
-{
-	bus_unregister(&vop_bus);
-}
-
-core_initcall(vop_init);
-module_exit(vop_exit);
-
-MODULE_AUTHOR("Intel Corporation");
-MODULE_DESCRIPTION("Intel(R) VOP Bus driver");
-MODULE_LICENSE("GPL v2");

drivers/misc/mic/bus/vop_bus.h

-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Intel MIC Platform Software Stack (MPSS)
- *
- * Copyright(c) 2016 Intel Corporation.
- *
- * Intel Virtio over PCIe Bus driver.
- */
-#ifndef _VOP_BUS_H_
-#define _VOP_BUS_H_
-/*
- * Everything a vop driver needs to work with any particular vop
- * implementation.
- */
-#include <linux/dmaengine.h>
-#include <linux/interrupt.h>
-
-#include "../common/mic_dev.h"
-
-struct vop_device_id {
-	u32 device;
-	u32 vendor;
-};
-
-#define VOP_DEV_TRNSP 1
-#define VOP_DEV_ANY_ID 0xffffffff
-/*
- * Size of the internal buffer used during DMA's as an intermediate buffer
- * for copy to/from user. Must be an integral number of pages.
- */
-#define VOP_INT_DMA_BUF_SIZE PAGE_ALIGN(64 * 1024ULL)
-
-/**
- * vop_device - representation of a device using vop
- * @hw_ops: the hardware ops supported by this device.
- * @id: the device type identification (used to match it with a driver).
- * @dev: underlying device.
- * @dnode - The destination node which this device will communicate with.
- * @aper: Aperture memory window
- * @dma_ch - DMA channel
- * @index: unique position on the vop bus
- */
-struct vop_device {
-	struct vop_hw_ops *hw_ops;
-	struct vop_device_id id;
-	struct device dev;
-	u8 dnode;
-	struct mic_mw *aper;
-	struct dma_chan *dma_ch;
-	int index;
-};
-
-/**
- * vop_driver - operations for a vop I/O driver
- * @driver: underlying device driver (populate name and owner).
- * @id_table: the ids serviced by this driver.
- * @probe: the function to call when a device is found.  Returns 0 or -errno.
- * @remove: the function to call when a device is removed.
- */
-struct vop_driver {
-	struct device_driver driver;
-	const struct vop_device_id *id_table;
-	int (*probe)(struct vop_device *dev);
-	void (*remove)(struct vop_device *dev);
-};
-
-/**
- * vop_hw_ops - Hardware operations for accessing a VOP device on the VOP bus.
- *
- * @next_db: Obtain the next available doorbell.
- * @request_irq: Request an interrupt on a particular doorbell.
- * @free_irq: Free an interrupt requested previously.
- * @ack_interrupt: acknowledge an interrupt in the ISR.
- * @get_remote_dp: Get access to the virtio device page used by the remote
- *                 node to add/remove/configure virtio devices.
- * @get_dp: Get access to the virtio device page used by the self
- *          node to add/remove/configure virtio devices.
- * @send_intr: Send an interrupt to the peer node on a specified doorbell.
- * @remap: Map a buffer with the specified DMA address and length.
- * @unmap: Unmap a buffer previously mapped.
- * @dma_filter: The DMA filter function to use for obtaining access to
- *		a DMA channel on the peer node.
- */
-struct vop_hw_ops {
-	int (*next_db)(struct vop_device *vpdev);
-	struct mic_irq *(*request_irq)(struct vop_device *vpdev,
-				       irqreturn_t (*func)(int irq, void *data),
-				       const char *name, void *data,
-				       int intr_src);
-	void (*free_irq)(struct vop_device *vpdev,
-			 struct mic_irq *cookie, void *data);
-	void (*ack_interrupt)(struct vop_device *vpdev, int num);
-	void __iomem * (*get_remote_dp)(struct vop_device *vpdev);
-	void * (*get_dp)(struct vop_device *vpdev);
-	void (*send_intr)(struct vop_device *vpdev, int db);
-	void __iomem * (*remap)(struct vop_device *vpdev,
-				  dma_addr_t pa, size_t len);
-	void (*unmap)(struct vop_device *vpdev, void __iomem *va);
-};
-
-struct vop_device *
-vop_register_device(struct device *pdev, int id,
-		    const struct dma_map_ops *dma_ops,
-		    struct vop_hw_ops *hw_ops, u8 dnode, struct mic_mw *aper,
-		    struct dma_chan *chan);
-void vop_unregister_device(struct vop_device *dev);
-int vop_register_driver(struct vop_driver *drv);
-void vop_unregister_driver(struct vop_driver *drv);
-
-/*
- * module_vop_driver() - Helper macro for drivers that don't do
- * anything special in module init/exit.  This eliminates a lot of
- * boilerplate.  Each module may only use this macro once, and
- * calling it replaces module_init() and module_exit()
- */
-#define module_vop_driver(__vop_driver) \
-	module_driver(__vop_driver, vop_register_driver, \
-			vop_unregister_driver)
-
-static inline struct vop_device *dev_to_vop(struct device *dev)
-{
-	return container_of(dev, struct vop_device, dev);
-}
-
-static inline struct vop_driver *drv_to_vop(struct device_driver *drv)
-{
-	return container_of(drv, struct vop_driver, driver);
-}
-#endif /* _VOP_BUS_H */