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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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ca9033ba69
In the iowait structure, two iowait_work entries were included to queue a given object: one for normal IB operations, and the other for TID RDMA operations. For non-TID RDMA operations, the iowait_work structure for TID RDMA is initialized to contain a NULL function (not used). When the QP is reset, the function iowait_cancel_work will be called to cancel any pending work. The problem is that this function will call cancel_work_sync() for both iowait_work entries, even though the one for TID RDMA is not used at all. Eventually, the call cascades to __flush_work(), wherein a WARN_ON will be triggered due to the fact that work->func is NULL. The WARN_ON was introduced in commit4d43d395fe("workqueue: Try to catch flush_work() without INIT_WORK().") This patch fixes the issue by making sure that a work function is present for TID RDMA before calling cancel_work_sync in iowait_cancel_work. Fixes:4d43d395fe("workqueue: Try to catch flush_work() without INIT_WORK().") Fixes:5da0fc9dbf("IB/hfi1: Prepare resource waits for dual leg") Link: https://lore.kernel.org/r/20191219211941.58387.39883.stgit@awfm-01.aw.intel.com Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by: Kaike Wan <kaike.wan@intel.com> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
129 lines
3.3 KiB
C
129 lines
3.3 KiB
C
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
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/*
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* Copyright(c) 2018 Intel Corporation.
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*
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*/
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#include "iowait.h"
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#include "trace_iowait.h"
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/* 1 priority == 16 starve_cnt */
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#define IOWAIT_PRIORITY_STARVE_SHIFT 4
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void iowait_set_flag(struct iowait *wait, u32 flag)
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{
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trace_hfi1_iowait_set(wait, flag);
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set_bit(flag, &wait->flags);
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}
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bool iowait_flag_set(struct iowait *wait, u32 flag)
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{
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return test_bit(flag, &wait->flags);
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}
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inline void iowait_clear_flag(struct iowait *wait, u32 flag)
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{
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trace_hfi1_iowait_clear(wait, flag);
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clear_bit(flag, &wait->flags);
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}
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/**
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* iowait_init() - initialize wait structure
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* @wait: wait struct to initialize
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* @tx_limit: limit for overflow queuing
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* @func: restart function for workqueue
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* @sleep: sleep function for no space
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* @resume: wakeup function for no space
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*
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* This function initializes the iowait
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* structure embedded in the QP or PQ.
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*
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*/
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void iowait_init(struct iowait *wait, u32 tx_limit,
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void (*func)(struct work_struct *work),
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void (*tidfunc)(struct work_struct *work),
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int (*sleep)(struct sdma_engine *sde,
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struct iowait_work *wait,
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struct sdma_txreq *tx,
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uint seq,
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bool pkts_sent),
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void (*wakeup)(struct iowait *wait, int reason),
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void (*sdma_drained)(struct iowait *wait),
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void (*init_priority)(struct iowait *wait))
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{
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int i;
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wait->count = 0;
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INIT_LIST_HEAD(&wait->list);
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init_waitqueue_head(&wait->wait_dma);
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init_waitqueue_head(&wait->wait_pio);
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atomic_set(&wait->sdma_busy, 0);
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atomic_set(&wait->pio_busy, 0);
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wait->tx_limit = tx_limit;
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wait->sleep = sleep;
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wait->wakeup = wakeup;
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wait->sdma_drained = sdma_drained;
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wait->init_priority = init_priority;
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wait->flags = 0;
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for (i = 0; i < IOWAIT_SES; i++) {
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wait->wait[i].iow = wait;
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INIT_LIST_HEAD(&wait->wait[i].tx_head);
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if (i == IOWAIT_IB_SE)
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INIT_WORK(&wait->wait[i].iowork, func);
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else
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INIT_WORK(&wait->wait[i].iowork, tidfunc);
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}
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}
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/**
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* iowait_cancel_work - cancel all work in iowait
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* @w: the iowait struct
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*/
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void iowait_cancel_work(struct iowait *w)
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{
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cancel_work_sync(&iowait_get_ib_work(w)->iowork);
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/* Make sure that the iowork for TID RDMA is used */
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if (iowait_get_tid_work(w)->iowork.func)
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cancel_work_sync(&iowait_get_tid_work(w)->iowork);
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}
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/**
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* iowait_set_work_flag - set work flag based on leg
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* @w - the iowait work struct
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*/
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int iowait_set_work_flag(struct iowait_work *w)
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{
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if (w == &w->iow->wait[IOWAIT_IB_SE]) {
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iowait_set_flag(w->iow, IOWAIT_PENDING_IB);
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return IOWAIT_IB_SE;
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}
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iowait_set_flag(w->iow, IOWAIT_PENDING_TID);
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return IOWAIT_TID_SE;
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}
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/**
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* iowait_priority_update_top - update the top priority entry
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* @w: the iowait struct
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* @top: a pointer to the top priority entry
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* @idx: the index of the current iowait in an array
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* @top_idx: the array index for the iowait entry that has the top priority
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*
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* This function is called to compare the priority of a given
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* iowait with the given top priority entry. The top index will
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* be returned.
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*/
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uint iowait_priority_update_top(struct iowait *w,
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struct iowait *top,
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uint idx, uint top_idx)
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{
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u8 cnt, tcnt;
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/* Convert priority into starve_cnt and compare the total.*/
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cnt = (w->priority << IOWAIT_PRIORITY_STARVE_SHIFT) + w->starved_cnt;
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tcnt = (top->priority << IOWAIT_PRIORITY_STARVE_SHIFT) +
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top->starved_cnt;
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if (cnt > tcnt)
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return idx;
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else
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return top_idx;
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}
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