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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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4e045572e2
Profiling suggests that the read_seqbegin() in the txreq put logic is colliding with other uses of the iowait lock. The packet at a time use of this lock dictates a unique lock to avoid reader/writer collisions when the number of vTxWait events is low. In order to support a unique lock the iowait struct embedded in the QP is extended to remember the lock that protects the queue head. The QP destroy removes that QP from any wait list. It doesn't need to know the head because of the linked list API, but it does need to know the lock required to protect the head. This also opens up the wait logic to have unique per resources locks which needs to be in future refinement. Reviewed-by: Sebastian Sanchez <sebastian.sanchez@intel.com> Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
309 lines
7.9 KiB
C
309 lines
7.9 KiB
C
#ifndef _HFI1_IOWAIT_H
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#define _HFI1_IOWAIT_H
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/*
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* Copyright(c) 2015, 2016 Intel Corporation.
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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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 version 2 of the GNU General Public License 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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* BSD LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/list.h>
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#include <linux/workqueue.h>
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#include <linux/sched.h>
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#include "sdma_txreq.h"
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/*
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* typedef (*restart_t)() - restart callback
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* @work: pointer to work structure
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*/
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typedef void (*restart_t)(struct work_struct *work);
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struct sdma_txreq;
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struct sdma_engine;
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/**
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* struct iowait - linkage for delayed progress/waiting
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* @list: used to add/insert into QP/PQ wait lists
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* @lock: uses to record the list head lock
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* @tx_head: overflow list of sdma_txreq's
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* @sleep: no space callback
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* @wakeup: space callback wakeup
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* @sdma_drained: sdma count drained
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* @iowork: workqueue overhead
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* @wait_dma: wait for sdma_busy == 0
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* @wait_pio: wait for pio_busy == 0
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* @sdma_busy: # of packets in flight
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* @count: total number of descriptors in tx_head'ed list
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* @tx_limit: limit for overflow queuing
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* @tx_count: number of tx entry's in tx_head'ed list
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*
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* This is to be embedded in user's state structure
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* (QP or PQ).
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*
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* The sleep and wakeup members are a
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* bit misnamed. They do not strictly
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* speaking sleep or wake up, but they
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* are callbacks for the ULP to implement
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* what ever queuing/dequeuing of
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* the embedded iowait and its containing struct
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* when a resource shortage like SDMA ring space is seen.
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*
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* Both potentially have locks help
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* so sleeping is not allowed.
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*
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* The wait_dma member along with the iow
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*
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* The lock field is used by waiters to record
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* the seqlock_t that guards the list head.
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* Waiters explicity know that, but the destroy
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* code that unwaits QPs does not.
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*/
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struct iowait {
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struct list_head list;
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struct list_head tx_head;
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int (*sleep)(
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struct sdma_engine *sde,
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struct iowait *wait,
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struct sdma_txreq *tx,
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unsigned seq);
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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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seqlock_t *lock;
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struct work_struct iowork;
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wait_queue_head_t wait_dma;
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wait_queue_head_t wait_pio;
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atomic_t sdma_busy;
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atomic_t pio_busy;
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u32 count;
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u32 tx_limit;
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u32 tx_count;
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};
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#define SDMA_AVAIL_REASON 0
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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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static inline void iowait_init(
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struct iowait *wait,
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u32 tx_limit,
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void (*func)(struct work_struct *work),
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int (*sleep)(
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struct sdma_engine *sde,
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struct iowait *wait,
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struct sdma_txreq *tx,
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unsigned seq),
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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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{
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wait->count = 0;
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wait->lock = NULL;
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INIT_LIST_HEAD(&wait->list);
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INIT_LIST_HEAD(&wait->tx_head);
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INIT_WORK(&wait->iowork, func);
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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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}
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/**
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* iowait_schedule() - initialize wait structure
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* @wait: wait struct to schedule
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* @wq: workqueue for schedule
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* @cpu: cpu
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*/
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static inline void iowait_schedule(
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struct iowait *wait,
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struct workqueue_struct *wq,
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int cpu)
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{
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queue_work_on(cpu, wq, &wait->iowork);
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}
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/**
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* iowait_sdma_drain() - wait for DMAs to drain
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*
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* @wait: iowait structure
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*
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* This will delay until the iowait sdmas have
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* completed.
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*/
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static inline void iowait_sdma_drain(struct iowait *wait)
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{
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wait_event(wait->wait_dma, !atomic_read(&wait->sdma_busy));
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}
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/**
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* iowait_sdma_pending() - return sdma pending count
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*
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* @wait: iowait structure
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*
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*/
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static inline int iowait_sdma_pending(struct iowait *wait)
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{
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return atomic_read(&wait->sdma_busy);
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}
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/**
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* iowait_sdma_inc - note sdma io pending
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* @wait: iowait structure
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*/
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static inline void iowait_sdma_inc(struct iowait *wait)
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{
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atomic_inc(&wait->sdma_busy);
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}
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/**
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* iowait_sdma_add - add count to pending
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* @wait: iowait structure
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*/
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static inline void iowait_sdma_add(struct iowait *wait, int count)
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{
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atomic_add(count, &wait->sdma_busy);
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}
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/**
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* iowait_sdma_dec - note sdma complete
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* @wait: iowait structure
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*/
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static inline int iowait_sdma_dec(struct iowait *wait)
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{
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return atomic_dec_and_test(&wait->sdma_busy);
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}
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/**
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* iowait_pio_drain() - wait for pios to drain
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*
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* @wait: iowait structure
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*
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* This will delay until the iowait pios have
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* completed.
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*/
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static inline void iowait_pio_drain(struct iowait *wait)
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{
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wait_event_timeout(wait->wait_pio,
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!atomic_read(&wait->pio_busy),
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HZ);
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}
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/**
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* iowait_pio_pending() - return pio pending count
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*
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* @wait: iowait structure
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*
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*/
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static inline int iowait_pio_pending(struct iowait *wait)
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{
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return atomic_read(&wait->pio_busy);
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}
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/**
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* iowait_pio_inc - note pio pending
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* @wait: iowait structure
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*/
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static inline void iowait_pio_inc(struct iowait *wait)
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{
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atomic_inc(&wait->pio_busy);
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}
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/**
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* iowait_sdma_dec - note pio complete
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* @wait: iowait structure
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*/
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static inline int iowait_pio_dec(struct iowait *wait)
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{
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return atomic_dec_and_test(&wait->pio_busy);
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}
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/**
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* iowait_drain_wakeup() - trigger iowait_drain() waiter
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*
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* @wait: iowait structure
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*
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* This will trigger any waiters.
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*/
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static inline void iowait_drain_wakeup(struct iowait *wait)
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{
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wake_up(&wait->wait_dma);
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wake_up(&wait->wait_pio);
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if (wait->sdma_drained)
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wait->sdma_drained(wait);
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}
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/**
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* iowait_get_txhead() - get packet off of iowait list
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*
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* @wait wait struture
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*/
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static inline struct sdma_txreq *iowait_get_txhead(struct iowait *wait)
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{
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struct sdma_txreq *tx = NULL;
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if (!list_empty(&wait->tx_head)) {
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tx = list_first_entry(
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&wait->tx_head,
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struct sdma_txreq,
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list);
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list_del_init(&tx->list);
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}
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return tx;
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}
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#endif
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