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* Intel MIC Platform Software Stack (MPSS)
* Copyright(c) 2014 Intel Corporation.
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, 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
* General Public License for more details.
* Intel SCIF driver.
#ifndef SCIF_MAIN_H
#define SCIF_MAIN_H
#include <linux/sched/signal.h>
#include <linux/pci.h>
#include <linux/miscdevice.h>
#include <linux/dmaengine.h>
#include <linux/iova.h>
#include <linux/anon_inodes.h>
#include <linux/file.h>
#include <linux/vmalloc.h>
#include <linux/scif.h>
#include "../common/mic_dev.h"
#define SCIF_MGMT_NODE 0
* Generic state used for certain node QP message exchanges
* like Unregister, Alloc etc.
enum scif_msg_state {
OP_IDLE = 1,
* struct scif_info - Global SCIF information
* @nodeid: Node ID this node is to others
* @maxid: Max known node ID
* @total: Total number of SCIF nodes
* @nr_zombies: number of zombie endpoints
* @eplock: Lock to synchronize listening, zombie endpoint lists
* @connlock: Lock to synchronize connected and disconnected lists
* @nb_connect_lock: Synchronize non blocking connect operations
* @port_lock: Synchronize access to SCIF ports
* @uaccept: List of user acceptreq waiting for acceptreg
* @listen: List of listening end points
* @zombie: List of zombie end points with pending RMA's
* @connected: List of end points in connected state
* @disconnected: List of end points in disconnected state
* @nb_connect_list: List for non blocking connections
* @misc_work: miscellaneous SCIF tasks
* @conflock: Lock to synchronize SCIF node configuration changes
* @en_msg_log: Enable debug message logging
* @p2p_enable: Enable P2P SCIF network
* @mdev: The MISC device
* @conn_work: Work for workqueue handling all connections
* @exitwq: Wait queue for waiting for an EXIT node QP message response
* @loopb_dev: Dummy SCIF device used for loopback
* @loopb_wq: Workqueue used for handling loopback messages
* @loopb_wqname[16]: Name of loopback workqueue
* @loopb_work: Used for submitting work to loopb_wq
* @loopb_recv_q: List of messages received on the loopb_wq
* @card_initiated_exit: set when the card has initiated the exit
* @rmalock: Synchronize access to RMA operations
* @fencelock: Synchronize access to list of remote fences requested.
* @rma: List of temporary registered windows to be destroyed.
* @rma_tc: List of temporary registered & cached Windows to be destroyed
* @fence: List of remote fence requests
* @mmu_notif_work: Work for registration caching MMU notifier workqueue
* @mmu_notif_cleanup: List of temporary cached windows for reg cache
* @rma_tc_limit: RMA temporary cache limit
struct scif_info {
u8 nodeid;
u8 maxid;
u8 total;
u32 nr_zombies;
struct mutex eplock;
struct mutex connlock;
spinlock_t nb_connect_lock;
spinlock_t port_lock;
struct list_head uaccept;
struct list_head listen;
struct list_head zombie;
struct list_head connected;
struct list_head disconnected;
struct list_head nb_connect_list;
struct work_struct misc_work;
struct mutex conflock;
u8 en_msg_log;
u8 p2p_enable;
struct miscdevice mdev;
struct work_struct conn_work;
wait_queue_head_t exitwq;
struct scif_dev *loopb_dev;
struct workqueue_struct *loopb_wq;
char loopb_wqname[16];
struct work_struct loopb_work;
struct list_head loopb_recv_q;
bool card_initiated_exit;
spinlock_t rmalock;
struct mutex fencelock;
struct list_head rma;
struct list_head rma_tc;
struct list_head fence;
struct work_struct mmu_notif_work;
struct list_head mmu_notif_cleanup;
unsigned long rma_tc_limit;
* struct scif_p2p_info - SCIF mapping information used for P2P
* @ppi_peer_id - SCIF peer node id
* @ppi_sg - Scatter list for bar information (One for mmio and one for aper)
* @sg_nentries - Number of entries in the scatterlist
* @ppi_da: DMA address for MMIO and APER bars
* @ppi_len: Length of MMIO and APER bars
* @ppi_list: Link in list of mapping information
struct scif_p2p_info {
u8 ppi_peer_id;
struct scatterlist *ppi_sg[2];
u64 sg_nentries[2];
dma_addr_t ppi_da[2];
u64 ppi_len[2];
#define SCIF_PPI_MMIO 0
#define SCIF_PPI_APER 1
struct list_head ppi_list;
* struct scif_dev - SCIF remote device specific fields
* @node: Node id
* @p2p: List of P2P mapping information
* @qpairs: The node queue pair for exchanging control messages
* @intr_wq: Workqueue for handling Node QP messages
* @intr_wqname: Name of node QP workqueue for handling interrupts
* @intr_bh: Used for submitting work to intr_wq
* @lock: Lock used for synchronizing access to the scif device
* @sdev: SCIF hardware device on the SCIF hardware bus
* @db: doorbell the peer will trigger to generate an interrupt on self
* @rdb: Doorbell to trigger on the peer to generate an interrupt on the peer
* @cookie: Cookie received while registering the interrupt handler
* @peer_add_work: Work for handling device_add for peer devices
* @p2p_dwork: Delayed work to enable polling for P2P state
* @qp_dwork: Delayed work for enabling polling for remote QP information
* @p2p_retry: Number of times to retry polling of P2P state
* @base_addr: P2P aperture bar base address
* @mic_mw mmio: The peer MMIO information used for P2P
* @spdev: SCIF peer device on the SCIF peer bus
* @node_remove_ack_pending: True if a node_remove_ack is pending
* @exit_ack_pending: true if an exit_ack is pending
* @disconn_wq: Used while waiting for a node remove response
* @disconn_rescnt: Keeps track of number of node remove requests sent
* @exit: Status of exit message
* @qp_dma_addr: Queue pair DMA address passed to the peer
* @dma_ch_idx: Round robin index for DMA channels
* @signal_pool: DMA pool used for scheduling scif_fence_signal DMA's
struct scif_dev {
u8 node;
struct list_head p2p;
struct scif_qp *qpairs;
struct workqueue_struct *intr_wq;
char intr_wqname[16];
struct work_struct intr_bh;
struct mutex lock;
struct scif_hw_dev *sdev;
int db;
int rdb;
struct mic_irq *cookie;
struct work_struct peer_add_work;
struct delayed_work p2p_dwork;
struct delayed_work qp_dwork;
int p2p_retry;
dma_addr_t base_addr;
struct mic_mw mmio;
struct scif_peer_dev __rcu *spdev;
bool node_remove_ack_pending;
bool exit_ack_pending;
wait_queue_head_t disconn_wq;
atomic_t disconn_rescnt;
enum scif_msg_state exit;
dma_addr_t qp_dma_addr;
int dma_ch_idx;
struct dma_pool *signal_pool;
extern bool scif_reg_cache_enable;
extern bool scif_ulimit_check;
extern struct scif_info scif_info;
extern struct idr scif_ports;
extern struct bus_type scif_peer_bus;
extern struct scif_dev *scif_dev;
extern const struct file_operations scif_fops;
extern const struct file_operations scif_anon_fops;
/* Size of the RB for the Node QP */
#define SCIF_NODE_QP_SIZE 0x10000
#include "scif_nodeqp.h"
#include "scif_rma.h"
#include "scif_rma_list.h"
* scifdev_self:
* @dev: The remote SCIF Device
* Returns true if the SCIF Device passed is the self aka Loopback SCIF device.
static inline int scifdev_self(struct scif_dev *dev)
return dev->node == scif_info.nodeid;
static inline bool scif_is_mgmt_node(void)
return !scif_info.nodeid;
* scifdev_is_p2p:
* @dev: The remote SCIF Device
* Returns true if the SCIF Device is a MIC Peer to Peer SCIF device.
static inline bool scifdev_is_p2p(struct scif_dev *dev)
if (scif_is_mgmt_node())
return false;
return dev != &scif_dev[SCIF_MGMT_NODE] &&
* scifdev_alive:
* @scifdev: The remote SCIF Device
* Returns true if the remote SCIF Device is running or sleeping for
* this endpoint.
static inline int _scifdev_alive(struct scif_dev *scifdev)
struct scif_peer_dev *spdev;
spdev = rcu_dereference(scifdev->spdev);
return !!spdev;
#include "scif_epd.h"
void __init scif_init_debugfs(void);
void scif_exit_debugfs(void);
int scif_setup_intr_wq(struct scif_dev *scifdev);
void scif_destroy_intr_wq(struct scif_dev *scifdev);
void scif_cleanup_scifdev(struct scif_dev *dev);
void scif_handle_remove_node(int node);
void scif_disconnect_node(u32 node_id, bool mgmt_initiated);
void scif_free_qp(struct scif_dev *dev);
void scif_misc_handler(struct work_struct *work);
void scif_stop(struct scif_dev *scifdev);
irqreturn_t scif_intr_handler(int irq, void *data);
#endif /* SCIF_MAIN_H */