diff options
Diffstat (limited to 'drivers/misc/mic/scif/scif_main.h')
| -rw-r--r-- | drivers/misc/mic/scif/scif_main.h | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/drivers/misc/mic/scif/scif_main.h b/drivers/misc/mic/scif/scif_main.h new file mode 100644 index 000000000000..580bc63e1b23 --- /dev/null +++ b/drivers/misc/mic/scif/scif_main.h @@ -0,0 +1,254 @@ +/* + * 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 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * Intel SCIF driver. + * + */ +#ifndef SCIF_MAIN_H +#define SCIF_MAIN_H + +#include <linux/sched.h> +#include <linux/pci.h> +#include <linux/miscdevice.h> +#include <linux/dmaengine.h> +#include <linux/file.h> +#include <linux/scif.h> + +#include "../common/mic_dev.h" + +#define SCIF_MGMT_NODE 0 +#define SCIF_DEFAULT_WATCHDOG_TO 30 +#define SCIF_NODE_ACCEPT_TIMEOUT (3 * HZ) +#define SCIF_NODE_ALIVE_TIMEOUT (SCIF_DEFAULT_WATCHDOG_TO * HZ) + +/* + * Generic state used for certain node QP message exchanges + * like Unregister, Alloc etc. + */ +enum scif_msg_state { + OP_IDLE = 1, + OP_IN_PROGRESS, + OP_COMPLETED, + OP_FAILED +}; + +/* + * 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 + */ +struct scif_info { + u8 nodeid; + u8 maxid; + u8 total; + u32 nr_zombies; + spinlock_t 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; +}; + +/* + * 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 + * init_msg_work: work scheduled for SCIF_INIT message processing + * @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 +*/ +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 init_msg_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; +}; + +extern struct scif_info scif_info; +extern struct idr scif_ports; +extern struct scif_dev *scif_dev; +extern const struct file_operations scif_fops; + +/* Size of the RB for the Node QP */ +#define SCIF_NODE_QP_SIZE 0x10000 + +#include "scif_nodeqp.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; + else + return dev != &scif_dev[SCIF_MGMT_NODE] && + !scifdev_self(dev); +} + +/* + * 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; + + rcu_read_lock(); + spdev = rcu_dereference(scifdev->spdev); + rcu_read_unlock(); + 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 */ |