284 lines
8.7 KiB
C
284 lines
8.7 KiB
C
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/*
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* Intel MIC Platform Software Stack (MPSS)
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*
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* Copyright(c) 2014 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* Intel SCIF driver.
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*
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*/
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#ifndef SCIF_MAIN_H
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#define SCIF_MAIN_H
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#include <linux/sched.h>
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#include <linux/pci.h>
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#include <linux/miscdevice.h>
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#include <linux/dmaengine.h>
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#include <linux/iova.h>
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#include <linux/anon_inodes.h>
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#include <linux/file.h>
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#include <linux/vmalloc.h>
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#include <linux/scif.h>
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#include "../common/mic_dev.h"
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#define SCIF_MGMT_NODE 0
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#define SCIF_DEFAULT_WATCHDOG_TO 30
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#define SCIF_NODE_ACCEPT_TIMEOUT (3 * HZ)
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#define SCIF_NODE_ALIVE_TIMEOUT (SCIF_DEFAULT_WATCHDOG_TO * HZ)
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#define SCIF_RMA_TEMP_CACHE_LIMIT 0x20000
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/*
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* Generic state used for certain node QP message exchanges
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* like Unregister, Alloc etc.
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*/
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enum scif_msg_state {
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OP_IDLE = 1,
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OP_IN_PROGRESS,
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OP_COMPLETED,
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OP_FAILED
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};
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/*
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* struct scif_info - Global SCIF information
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*
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* @nodeid: Node ID this node is to others
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* @maxid: Max known node ID
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* @total: Total number of SCIF nodes
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* @nr_zombies: number of zombie endpoints
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* @eplock: Lock to synchronize listening, zombie endpoint lists
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* @connlock: Lock to synchronize connected and disconnected lists
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* @nb_connect_lock: Synchronize non blocking connect operations
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* @port_lock: Synchronize access to SCIF ports
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* @uaccept: List of user acceptreq waiting for acceptreg
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* @listen: List of listening end points
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* @zombie: List of zombie end points with pending RMA's
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* @connected: List of end points in connected state
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* @disconnected: List of end points in disconnected state
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* @nb_connect_list: List for non blocking connections
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* @misc_work: miscellaneous SCIF tasks
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* @conflock: Lock to synchronize SCIF node configuration changes
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* @en_msg_log: Enable debug message logging
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* @p2p_enable: Enable P2P SCIF network
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* @mdev: The MISC device
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* @conn_work: Work for workqueue handling all connections
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* @exitwq: Wait queue for waiting for an EXIT node QP message response
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* @loopb_dev: Dummy SCIF device used for loopback
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* @loopb_wq: Workqueue used for handling loopback messages
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* @loopb_wqname[16]: Name of loopback workqueue
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* @loopb_work: Used for submitting work to loopb_wq
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* @loopb_recv_q: List of messages received on the loopb_wq
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* @card_initiated_exit: set when the card has initiated the exit
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* @rmalock: Synchronize access to RMA operations
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* @fencelock: Synchronize access to list of remote fences requested.
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* @rma: List of temporary registered windows to be destroyed.
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* @rma_tc: List of temporary registered & cached Windows to be destroyed
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* @fence: List of remote fence requests
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* @mmu_notif_work: Work for registration caching MMU notifier workqueue
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* @mmu_notif_cleanup: List of temporary cached windows for reg cache
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* @rma_tc_limit: RMA temporary cache limit
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*/
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struct scif_info {
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u8 nodeid;
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u8 maxid;
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u8 total;
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u32 nr_zombies;
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struct mutex eplock;
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struct mutex connlock;
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spinlock_t nb_connect_lock;
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spinlock_t port_lock;
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struct list_head uaccept;
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struct list_head listen;
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struct list_head zombie;
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struct list_head connected;
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struct list_head disconnected;
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struct list_head nb_connect_list;
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struct work_struct misc_work;
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struct mutex conflock;
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u8 en_msg_log;
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u8 p2p_enable;
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struct miscdevice mdev;
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struct work_struct conn_work;
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wait_queue_head_t exitwq;
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struct scif_dev *loopb_dev;
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struct workqueue_struct *loopb_wq;
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char loopb_wqname[16];
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struct work_struct loopb_work;
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struct list_head loopb_recv_q;
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bool card_initiated_exit;
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spinlock_t rmalock;
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struct mutex fencelock;
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struct list_head rma;
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struct list_head rma_tc;
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struct list_head fence;
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struct work_struct mmu_notif_work;
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struct list_head mmu_notif_cleanup;
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unsigned long rma_tc_limit;
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};
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/*
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* struct scif_p2p_info - SCIF mapping information used for P2P
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*
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* @ppi_peer_id - SCIF peer node id
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* @ppi_sg - Scatter list for bar information (One for mmio and one for aper)
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* @sg_nentries - Number of entries in the scatterlist
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* @ppi_da: DMA address for MMIO and APER bars
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* @ppi_len: Length of MMIO and APER bars
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* @ppi_list: Link in list of mapping information
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*/
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struct scif_p2p_info {
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u8 ppi_peer_id;
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struct scatterlist *ppi_sg[2];
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u64 sg_nentries[2];
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dma_addr_t ppi_da[2];
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u64 ppi_len[2];
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#define SCIF_PPI_MMIO 0
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#define SCIF_PPI_APER 1
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struct list_head ppi_list;
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};
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/*
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* struct scif_dev - SCIF remote device specific fields
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*
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* @node: Node id
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* @p2p: List of P2P mapping information
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* @qpairs: The node queue pair for exchanging control messages
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* @intr_wq: Workqueue for handling Node QP messages
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* @intr_wqname: Name of node QP workqueue for handling interrupts
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* @intr_bh: Used for submitting work to intr_wq
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* @lock: Lock used for synchronizing access to the scif device
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* @sdev: SCIF hardware device on the SCIF hardware bus
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* @db: doorbell the peer will trigger to generate an interrupt on self
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* @rdb: Doorbell to trigger on the peer to generate an interrupt on the peer
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* @cookie: Cookie received while registering the interrupt handler
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* @peer_add_work: Work for handling device_add for peer devices
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* @p2p_dwork: Delayed work to enable polling for P2P state
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* @qp_dwork: Delayed work for enabling polling for remote QP information
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* @p2p_retry: Number of times to retry polling of P2P state
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* @base_addr: P2P aperture bar base address
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* @mic_mw mmio: The peer MMIO information used for P2P
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* @spdev: SCIF peer device on the SCIF peer bus
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* @node_remove_ack_pending: True if a node_remove_ack is pending
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* @exit_ack_pending: true if an exit_ack is pending
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* @disconn_wq: Used while waiting for a node remove response
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* @disconn_rescnt: Keeps track of number of node remove requests sent
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* @exit: Status of exit message
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* @qp_dma_addr: Queue pair DMA address passed to the peer
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* @dma_ch_idx: Round robin index for DMA channels
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* @signal_pool: DMA pool used for scheduling scif_fence_signal DMA's
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*/
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struct scif_dev {
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u8 node;
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struct list_head p2p;
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struct scif_qp *qpairs;
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struct workqueue_struct *intr_wq;
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char intr_wqname[16];
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struct work_struct intr_bh;
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struct mutex lock;
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struct scif_hw_dev *sdev;
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int db;
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int rdb;
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struct mic_irq *cookie;
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struct work_struct peer_add_work;
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struct delayed_work p2p_dwork;
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struct delayed_work qp_dwork;
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int p2p_retry;
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dma_addr_t base_addr;
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struct mic_mw mmio;
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struct scif_peer_dev __rcu *spdev;
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bool node_remove_ack_pending;
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bool exit_ack_pending;
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wait_queue_head_t disconn_wq;
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atomic_t disconn_rescnt;
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enum scif_msg_state exit;
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dma_addr_t qp_dma_addr;
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int dma_ch_idx;
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struct dma_pool *signal_pool;
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};
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extern bool scif_reg_cache_enable;
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extern bool scif_ulimit_check;
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extern struct scif_info scif_info;
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extern struct idr scif_ports;
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extern struct bus_type scif_peer_bus;
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extern struct scif_dev *scif_dev;
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extern const struct file_operations scif_fops;
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extern const struct file_operations scif_anon_fops;
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/* Size of the RB for the Node QP */
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#define SCIF_NODE_QP_SIZE 0x10000
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#include "scif_nodeqp.h"
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#include "scif_rma.h"
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#include "scif_rma_list.h"
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/*
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* scifdev_self:
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* @dev: The remote SCIF Device
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*
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* Returns true if the SCIF Device passed is the self aka Loopback SCIF device.
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*/
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static inline int scifdev_self(struct scif_dev *dev)
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{
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return dev->node == scif_info.nodeid;
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}
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static inline bool scif_is_mgmt_node(void)
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{
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return !scif_info.nodeid;
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}
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/*
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* scifdev_is_p2p:
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* @dev: The remote SCIF Device
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*
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* Returns true if the SCIF Device is a MIC Peer to Peer SCIF device.
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*/
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static inline bool scifdev_is_p2p(struct scif_dev *dev)
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{
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if (scif_is_mgmt_node())
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return false;
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else
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return dev != &scif_dev[SCIF_MGMT_NODE] &&
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!scifdev_self(dev);
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}
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/*
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* scifdev_alive:
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* @scifdev: The remote SCIF Device
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*
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* Returns true if the remote SCIF Device is running or sleeping for
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* this endpoint.
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*/
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static inline int _scifdev_alive(struct scif_dev *scifdev)
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{
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struct scif_peer_dev *spdev;
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rcu_read_lock();
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spdev = rcu_dereference(scifdev->spdev);
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rcu_read_unlock();
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return !!spdev;
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}
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#include "scif_epd.h"
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void __init scif_init_debugfs(void);
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void scif_exit_debugfs(void);
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int scif_setup_intr_wq(struct scif_dev *scifdev);
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void scif_destroy_intr_wq(struct scif_dev *scifdev);
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void scif_cleanup_scifdev(struct scif_dev *dev);
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void scif_handle_remove_node(int node);
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void scif_disconnect_node(u32 node_id, bool mgmt_initiated);
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void scif_free_qp(struct scif_dev *dev);
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void scif_misc_handler(struct work_struct *work);
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void scif_stop(struct scif_dev *scifdev);
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irqreturn_t scif_intr_handler(int irq, void *data);
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#endif /* SCIF_MAIN_H */
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