drivers/misc/mic/scif/scif_nodeqp.h - arm/linux - Git at Google

 /*
  * Intel MIC Platform Software Stack (MPSS)
  *
  * This file is provided under a dual BSD/GPLv2 license.  When using or
  * redistributing this file, you may do so under either license.
  *
  * GPL LICENSE SUMMARY
  *
  * Copyright(c) 2014 Intel Corporation.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  *
  * BSD LICENSE
  *
  * Copyright(c) 2014 Intel Corporation.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * * Redistributions of source code must retain the above copyright
  *   notice, this list of conditions and the following disclaimer.
  * * Redistributions in binary form must reproduce the above copyright
  *   notice, this list of conditions and the following disclaimer in
  *   the documentation and/or other materials provided with the
  *   distribution.
  * * Neither the name of Intel Corporation nor the names of its
  *   contributors may be used to endorse or promote products derived
  *   from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * Intel SCIF driver.
  *
  */
 #ifndef SCIF_NODEQP
 #define SCIF_NODEQP

 #include "scif_rb.h"
 #include "scif_peer_bus.h"

 #define SCIF_INIT 1  /* First message sent to the peer node for discovery */
 #define SCIF_EXIT 2  /* Last message from the peer informing intent to exit */
 #define SCIF_EXIT_ACK 3 /* Response to SCIF_EXIT message */
 #define SCIF_NODE_ADD 4  /* Tell Online nodes a new node exits */
 #define SCIF_NODE_ADD_ACK 5  /* Confirm to mgmt node sequence is finished */
 #define SCIF_NODE_ADD_NACK 6 /* SCIF_NODE_ADD failed */
 #define SCIF_NODE_REMOVE 7 /* Request to deactivate a SCIF node */
 #define SCIF_NODE_REMOVE_ACK 8 /* Response to a SCIF_NODE_REMOVE message */
 #define SCIF_CNCT_REQ 9  /* Phys addr of Request connection to a port */
 #define SCIF_CNCT_GNT 10  /* Phys addr of new Grant connection request */
 #define SCIF_CNCT_GNTACK 11  /* Error type Reject a connection request */
 #define SCIF_CNCT_GNTNACK 12  /* Error type Reject a connection request */
 #define SCIF_CNCT_REJ 13  /* Error type Reject a connection request */
 #define SCIF_DISCNCT 14 /* Notify peer that connection is being terminated */
 #define SCIF_DISCNT_ACK 15 /* Notify peer that connection is being terminated */
 #define SCIF_CLIENT_SENT 16 /* Notify the peer that data has been written */
 #define SCIF_CLIENT_RCVD 17 /* Notify the peer that data has been read */
 #define SCIF_GET_NODE_INFO 18 /* Get current node mask from the mgmt node*/
 #define SCIF_REGISTER 19 /* Tell peer about a new registered window */
 #define SCIF_REGISTER_ACK 20 /* Notify peer about unregistration success */
 #define SCIF_REGISTER_NACK 21 /* Notify peer about registration success */
 #define SCIF_UNREGISTER 22 /* Tell peer about unregistering a window */
 #define SCIF_UNREGISTER_ACK 23 /* Notify peer about registration failure */
 #define SCIF_UNREGISTER_NACK 24 /* Notify peer about unregistration failure */
 #define SCIF_ALLOC_REQ 25 /* Request a mapped buffer */
 #define SCIF_ALLOC_GNT 26 /* Notify peer about allocation success */
 #define SCIF_ALLOC_REJ 27 /* Notify peer about allocation failure */
 #define SCIF_FREE_VIRT 28 /* Free previously allocated virtual memory */
 #define SCIF_MUNMAP 29 /* Acknowledgment for a SCIF_MMAP request */
 #define SCIF_MARK 30 /* SCIF Remote Fence Mark Request */
 #define SCIF_MARK_ACK 31 /* SCIF Remote Fence Mark Success */
 #define SCIF_MARK_NACK 32 /* SCIF Remote Fence Mark Failure */
 #define SCIF_WAIT 33 /* SCIF Remote Fence Wait Request */
 #define SCIF_WAIT_ACK 34 /* SCIF Remote Fence Wait Success */
 #define SCIF_WAIT_NACK 35 /* SCIF Remote Fence Wait Failure */
 #define SCIF_SIG_LOCAL 36 /* SCIF Remote Fence Local Signal Request */
 #define SCIF_SIG_REMOTE 37 /* SCIF Remote Fence Remote Signal Request */
 #define SCIF_SIG_ACK 38 /* SCIF Remote Fence Remote Signal Success */
 #define SCIF_SIG_NACK 39 /* SCIF Remote Fence Remote Signal Failure */
 #define SCIF_MAX_MSG SCIF_SIG_NACK

 /*
  * struct scifmsg - Node QP message format
  *
  * @src: Source information
  * @dst: Destination information
  * @uop: The message opcode
  * @payload: Unique payload format for each message
  */
 struct scifmsg {
 	struct scif_port_id src;
 	struct scif_port_id dst;
 	u32 uop;
 	u64 payload[4];
 } __packed;

 /*
  * struct scif_allocmsg - Used with SCIF_ALLOC_REQ to request
  * the remote note to allocate memory
  *
  * phys_addr: Physical address of the buffer
  * vaddr: Virtual address of the buffer
  * size: Size of the buffer
  * state: Current state
  * allocwq: wait queue for status
  */
 struct scif_allocmsg {
 	dma_addr_t phys_addr;
 	unsigned long vaddr;
 	size_t size;
 	enum scif_msg_state state;
 	wait_queue_head_t allocwq;
 };

 /*
  * struct scif_qp - Node Queue Pair
  *
  * Interesting structure -- a little difficult because we can only
  * write across the PCIe, so any r/w pointer we need to read is
  * local. We only need to read the read pointer on the inbound_q
  * and read the write pointer in the outbound_q
  *
  * @magic: Magic value to ensure the peer sees the QP correctly
  * @outbound_q: The outbound ring buffer for sending messages
  * @inbound_q: The inbound ring buffer for receiving messages
  * @local_write: Local write index
  * @local_read: Local read index
  * @remote_qp: The remote queue pair
  * @local_buf: DMA address of local ring buffer
  * @local_qp: DMA address of the local queue pair data structure
  * @remote_buf: DMA address of remote ring buffer
  * @qp_state: QP state i.e. online or offline used for P2P
  * @send_lock: synchronize access to outbound queue
  * @recv_lock: Synchronize access to inbound queue
  */
 struct scif_qp {
 	u64 magic;
 #define SCIFEP_MAGIC 0x5c1f000000005c1fULL
 	struct scif_rb outbound_q;
 	struct scif_rb inbound_q;

 	u32 local_write __aligned(64);
 	u32 local_read __aligned(64);
 	struct scif_qp *remote_qp;
 	dma_addr_t local_buf;
 	dma_addr_t local_qp;
 	dma_addr_t remote_buf;
 	u32 qp_state;
 #define SCIF_QP_OFFLINE 0xdead
 #define SCIF_QP_ONLINE 0xc0de
 	spinlock_t send_lock;
 	spinlock_t recv_lock;
 };

 /*
  * struct scif_loopb_msg - An element in the loopback Node QP message list.
  *
  * @msg - The SCIF node QP message
  * @list - link in the list of messages
  */
 struct scif_loopb_msg {
 	struct scifmsg msg;
 	struct list_head list;
 };

 int scif_nodeqp_send(struct scif_dev *scifdev, struct scifmsg *msg);
 int _scif_nodeqp_send(struct scif_dev *scifdev, struct scifmsg *msg);
 void scif_nodeqp_intrhandler(struct scif_dev *scifdev, struct scif_qp *qp);
 int scif_loopb_msg_handler(struct scif_dev *scifdev, struct scif_qp *qp);
 int scif_setup_qp(struct scif_dev *scifdev);
 int scif_qp_response(phys_addr_t phys, struct scif_dev *dev);
 int scif_setup_qp_connect(struct scif_qp *qp, dma_addr_t *qp_offset,
 			  int local_size, struct scif_dev *scifdev);
 int scif_setup_qp_accept(struct scif_qp *qp, dma_addr_t *qp_offset,
 			 dma_addr_t phys, int local_size,
 			 struct scif_dev *scifdev);
 int scif_setup_qp_connect_response(struct scif_dev *scifdev,
 				   struct scif_qp *qp, u64 payload);
 int scif_setup_loopback_qp(struct scif_dev *scifdev);
 int scif_destroy_loopback_qp(struct scif_dev *scifdev);
 void scif_poll_qp_state(struct work_struct *work);
 void scif_destroy_p2p(struct scif_dev *scifdev);
 void scif_send_exit(struct scif_dev *scifdev);
 static inline struct device *scif_get_peer_dev(struct scif_dev *scifdev)
 {
 	struct scif_peer_dev *spdev;
 	struct device *spdev_ret;

 	rcu_read_lock();
 	spdev = rcu_dereference(scifdev->spdev);
 	if (spdev)
 		spdev_ret = get_device(&spdev->dev);
 	else
 		spdev_ret = ERR_PTR(-ENODEV);
 	rcu_read_unlock();
 	return spdev_ret;
 }

 static inline void scif_put_peer_dev(struct device *dev)
 {
 	put_device(dev);
 }
 #endif  /* SCIF_NODEQP */
	/*
	* Intel MIC Platform Software Stack (MPSS)
	*
	* This file is provided under a dual BSD/GPLv2 license. When using or
	* redistributing this file, you may do so under either license.
	*
	* GPL LICENSE SUMMARY
	*
	* Copyright(c) 2014 Intel Corporation.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of version 2 of the GNU General Public License as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* BSD LICENSE
	*
	* Copyright(c) 2014 Intel Corporation.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name of Intel Corporation nor the names of its
	* contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*
	* Intel SCIF driver.
	*
	*/
	#ifndef SCIF_NODEQP
	#define SCIF_NODEQP

	#include "scif_rb.h"
	#include "scif_peer_bus.h"

	#define SCIF_INIT 1 /* First message sent to the peer node for discovery */
	#define SCIF_EXIT 2 /* Last message from the peer informing intent to exit */
	#define SCIF_EXIT_ACK 3 /* Response to SCIF_EXIT message */
	#define SCIF_NODE_ADD 4 /* Tell Online nodes a new node exits */
	#define SCIF_NODE_ADD_ACK 5 /* Confirm to mgmt node sequence is finished */
	#define SCIF_NODE_ADD_NACK 6 /* SCIF_NODE_ADD failed */
	#define SCIF_NODE_REMOVE 7 /* Request to deactivate a SCIF node */
	#define SCIF_NODE_REMOVE_ACK 8 /* Response to a SCIF_NODE_REMOVE message */
	#define SCIF_CNCT_REQ 9 /* Phys addr of Request connection to a port */
	#define SCIF_CNCT_GNT 10 /* Phys addr of new Grant connection request */
	#define SCIF_CNCT_GNTACK 11 /* Error type Reject a connection request */
	#define SCIF_CNCT_GNTNACK 12 /* Error type Reject a connection request */
	#define SCIF_CNCT_REJ 13 /* Error type Reject a connection request */
	#define SCIF_DISCNCT 14 /* Notify peer that connection is being terminated */
	#define SCIF_DISCNT_ACK 15 /* Notify peer that connection is being terminated */
	#define SCIF_CLIENT_SENT 16 /* Notify the peer that data has been written */
	#define SCIF_CLIENT_RCVD 17 /* Notify the peer that data has been read */
	#define SCIF_GET_NODE_INFO 18 /* Get current node mask from the mgmt node*/
	#define SCIF_REGISTER 19 /* Tell peer about a new registered window */
	#define SCIF_REGISTER_ACK 20 /* Notify peer about unregistration success */
	#define SCIF_REGISTER_NACK 21 /* Notify peer about registration success */
	#define SCIF_UNREGISTER 22 /* Tell peer about unregistering a window */
	#define SCIF_UNREGISTER_ACK 23 /* Notify peer about registration failure */
	#define SCIF_UNREGISTER_NACK 24 /* Notify peer about unregistration failure */
	#define SCIF_ALLOC_REQ 25 /* Request a mapped buffer */
	#define SCIF_ALLOC_GNT 26 /* Notify peer about allocation success */
	#define SCIF_ALLOC_REJ 27 /* Notify peer about allocation failure */
	#define SCIF_FREE_VIRT 28 /* Free previously allocated virtual memory */
	#define SCIF_MUNMAP 29 /* Acknowledgment for a SCIF_MMAP request */
	#define SCIF_MARK 30 /* SCIF Remote Fence Mark Request */
	#define SCIF_MARK_ACK 31 /* SCIF Remote Fence Mark Success */
	#define SCIF_MARK_NACK 32 /* SCIF Remote Fence Mark Failure */
	#define SCIF_WAIT 33 /* SCIF Remote Fence Wait Request */
	#define SCIF_WAIT_ACK 34 /* SCIF Remote Fence Wait Success */
	#define SCIF_WAIT_NACK 35 /* SCIF Remote Fence Wait Failure */
	#define SCIF_SIG_LOCAL 36 /* SCIF Remote Fence Local Signal Request */
	#define SCIF_SIG_REMOTE 37 /* SCIF Remote Fence Remote Signal Request */
	#define SCIF_SIG_ACK 38 /* SCIF Remote Fence Remote Signal Success */
	#define SCIF_SIG_NACK 39 /* SCIF Remote Fence Remote Signal Failure */
	#define SCIF_MAX_MSG SCIF_SIG_NACK

	/*
	* struct scifmsg - Node QP message format
	*
	* @src: Source information
	* @dst: Destination information
	* @uop: The message opcode
	* @payload: Unique payload format for each message
	*/
	struct scifmsg {
	struct scif_port_id src;
	struct scif_port_id dst;
	u32 uop;
	u64 payload[4];
	} __packed;

	/*
	* struct scif_allocmsg - Used with SCIF_ALLOC_REQ to request
	* the remote note to allocate memory
	*
	* phys_addr: Physical address of the buffer
	* vaddr: Virtual address of the buffer
	* size: Size of the buffer
	* state: Current state
	* allocwq: wait queue for status
	*/
	struct scif_allocmsg {
	dma_addr_t phys_addr;
	unsigned long vaddr;
	size_t size;
	enum scif_msg_state state;
	wait_queue_head_t allocwq;
	};

	/*
	* struct scif_qp - Node Queue Pair
	*
	* Interesting structure -- a little difficult because we can only
	* write across the PCIe, so any r/w pointer we need to read is
	* local. We only need to read the read pointer on the inbound_q
	* and read the write pointer in the outbound_q
	*
	* @magic: Magic value to ensure the peer sees the QP correctly
	* @outbound_q: The outbound ring buffer for sending messages
	* @inbound_q: The inbound ring buffer for receiving messages
	* @local_write: Local write index
	* @local_read: Local read index
	* @remote_qp: The remote queue pair
	* @local_buf: DMA address of local ring buffer
	* @local_qp: DMA address of the local queue pair data structure
	* @remote_buf: DMA address of remote ring buffer
	* @qp_state: QP state i.e. online or offline used for P2P
	* @send_lock: synchronize access to outbound queue
	* @recv_lock: Synchronize access to inbound queue
	*/
	struct scif_qp {
	u64 magic;
	#define SCIFEP_MAGIC 0x5c1f000000005c1fULL
	struct scif_rb outbound_q;
	struct scif_rb inbound_q;

	u32 local_write __aligned(64);
	u32 local_read __aligned(64);
	struct scif_qp *remote_qp;
	dma_addr_t local_buf;
	dma_addr_t local_qp;
	dma_addr_t remote_buf;
	u32 qp_state;
	#define SCIF_QP_OFFLINE 0xdead
	#define SCIF_QP_ONLINE 0xc0de
	spinlock_t send_lock;
	spinlock_t recv_lock;
	};

	/*
	* struct scif_loopb_msg - An element in the loopback Node QP message list.
	*
	* @msg - The SCIF node QP message
	* @list - link in the list of messages
	*/
	struct scif_loopb_msg {
	struct scifmsg msg;
	struct list_head list;
	};

	int scif_nodeqp_send(struct scif_dev scifdev, struct scifmsg msg);
	int _scif_nodeqp_send(struct scif_dev scifdev, struct scifmsg msg);
	void scif_nodeqp_intrhandler(struct scif_dev scifdev, struct scif_qp qp);
	int scif_loopb_msg_handler(struct scif_dev scifdev, struct scif_qp qp);
	int scif_setup_qp(struct scif_dev *scifdev);
	int scif_qp_response(phys_addr_t phys, struct scif_dev *dev);
	int scif_setup_qp_connect(struct scif_qp qp, dma_addr_t qp_offset,
	int local_size, struct scif_dev *scifdev);
	int scif_setup_qp_accept(struct scif_qp qp, dma_addr_t qp_offset,
	dma_addr_t phys, int local_size,
	struct scif_dev *scifdev);
	int scif_setup_qp_connect_response(struct scif_dev *scifdev,
	struct scif_qp *qp, u64 payload);
	int scif_setup_loopback_qp(struct scif_dev *scifdev);
	int scif_destroy_loopback_qp(struct scif_dev *scifdev);
	void scif_poll_qp_state(struct work_struct *work);
	void scif_destroy_p2p(struct scif_dev *scifdev);
	void scif_send_exit(struct scif_dev *scifdev);
	static inline struct device scif_get_peer_dev(struct scif_dev scifdev)
	{
	struct scif_peer_dev *spdev;
	struct device *spdev_ret;

	rcu_read_lock();
	spdev = rcu_dereference(scifdev->spdev);
	if (spdev)
	spdev_ret = get_device(&spdev->dev);
	else
	spdev_ret = ERR_PTR(-ENODEV);
	rcu_read_unlock();
	return spdev_ret;
	}

	static inline void scif_put_peer_dev(struct device *dev)
	{
	put_device(dev);
	}
	#endif /* SCIF_NODEQP */