linux/drivers/infiniband/hw/hfi1/iowait.c

// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
/*
 * Copyright(c) 2018 Intel Corporation.
 *
 */
#include "iowait.h"
#include "trace_iowait.h"

/* 1 priority == 16 starve_cnt */
#define IOWAIT_PRIORITY_STARVE_SHIFT …

void iowait_set_flag(struct iowait *wait, u32 flag)
{ … }

bool iowait_flag_set(struct iowait *wait, u32 flag)
{ … }

inline void iowait_clear_flag(struct iowait *wait, u32 flag)
{ … }

/*
 * iowait_init() - initialize wait structure
 * @wait: wait struct to initialize
 * @tx_limit: limit for overflow queuing
 * @func: restart function for workqueue
 * @sleep: sleep function for no space
 * @resume: wakeup function for no space
 *
 * This function initializes the iowait
 * structure embedded in the QP or PQ.
 *
 */
void iowait_init(struct iowait *wait, u32 tx_limit,
		 void (*func)(struct work_struct *work),
		 void (*tidfunc)(struct work_struct *work),
		 int (*sleep)(struct sdma_engine *sde,
			      struct iowait_work *wait,
			      struct sdma_txreq *tx,
			      uint seq,
			      bool pkts_sent),
		 void (*wakeup)(struct iowait *wait, int reason),
		 void (*sdma_drained)(struct iowait *wait),
		 void (*init_priority)(struct iowait *wait))
{ … }

/**
 * iowait_cancel_work - cancel all work in iowait
 * @w: the iowait struct
 */
void iowait_cancel_work(struct iowait *w)
{ … }

/**
 * iowait_set_work_flag - set work flag based on leg
 * @w: the iowait work struct
 */
int iowait_set_work_flag(struct iowait_work *w)
{ … }

/**
 * iowait_priority_update_top - update the top priority entry
 * @w: the iowait struct
 * @top: a pointer to the top priority entry
 * @idx: the index of the current iowait in an array
 * @top_idx: the array index for the iowait entry that has the top priority
 *
 * This function is called to compare the priority of a given
 * iowait with the given top priority entry. The top index will
 * be returned.
 */
uint iowait_priority_update_top(struct iowait *w,
				struct iowait *top,
				uint idx, uint top_idx)
{ … }