diff options
Diffstat (limited to 'drivers/staging/rdma/hfi1/iowait.h')
| -rw-r--r-- | drivers/staging/rdma/hfi1/iowait.h | 300 |
1 files changed, 0 insertions, 300 deletions
diff --git a/drivers/staging/rdma/hfi1/iowait.h b/drivers/staging/rdma/hfi1/iowait.h deleted file mode 100644 index 2ec6ef38d389..000000000000 --- a/drivers/staging/rdma/hfi1/iowait.h +++ /dev/null @@ -1,300 +0,0 @@ -#ifndef _HFI1_IOWAIT_H -#define _HFI1_IOWAIT_H -/* - * Copyright(c) 2015, 2016 Intel Corporation. - * - * This file is provided under a dual BSD/GPLv2 license. When using or - * redistributing this file, you may do so under either license. - * - * GPL LICENSE SUMMARY - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of version 2 of the GNU General Public License 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. - * - * BSD LICENSE - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * - Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * - Neither the name of Intel Corporation nor the names of its - * contributors may be used to endorse or promote products derived - * from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - * - */ - -#include <linux/list.h> -#include <linux/workqueue.h> -#include <linux/sched.h> - -#include "sdma_txreq.h" - -/* - * typedef (*restart_t)() - restart callback - * @work: pointer to work structure - */ -typedef void (*restart_t)(struct work_struct *work); - -struct sdma_txreq; -struct sdma_engine; -/** - * struct iowait - linkage for delayed progress/waiting - * @list: used to add/insert into QP/PQ wait lists - * @tx_head: overflow list of sdma_txreq's - * @sleep: no space callback - * @wakeup: space callback wakeup - * @sdma_drained: sdma count drained - * @iowork: workqueue overhead - * @wait_dma: wait for sdma_busy == 0 - * @wait_pio: wait for pio_busy == 0 - * @sdma_busy: # of packets in flight - * @count: total number of descriptors in tx_head'ed list - * @tx_limit: limit for overflow queuing - * @tx_count: number of tx entry's in tx_head'ed list - * - * This is to be embedded in user's state structure - * (QP or PQ). - * - * The sleep and wakeup members are a - * bit misnamed. They do not strictly - * speaking sleep or wake up, but they - * are callbacks for the ULP to implement - * what ever queuing/dequeuing of - * the embedded iowait and its containing struct - * when a resource shortage like SDMA ring space is seen. - * - * Both potentially have locks help - * so sleeping is not allowed. - * - * The wait_dma member along with the iow - */ - -struct iowait { - struct list_head list; - struct list_head tx_head; - int (*sleep)( - struct sdma_engine *sde, - struct iowait *wait, - struct sdma_txreq *tx, - unsigned seq); - void (*wakeup)(struct iowait *wait, int reason); - void (*sdma_drained)(struct iowait *wait); - struct work_struct iowork; - wait_queue_head_t wait_dma; - wait_queue_head_t wait_pio; - atomic_t sdma_busy; - atomic_t pio_busy; - u32 count; - u32 tx_limit; - u32 tx_count; -}; - -#define SDMA_AVAIL_REASON 0 - -/** - * 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. - * - */ - -static inline void iowait_init( - struct iowait *wait, - u32 tx_limit, - void (*func)(struct work_struct *work), - int (*sleep)( - struct sdma_engine *sde, - struct iowait *wait, - struct sdma_txreq *tx, - unsigned seq), - void (*wakeup)(struct iowait *wait, int reason), - void (*sdma_drained)(struct iowait *wait)) -{ - wait->count = 0; - INIT_LIST_HEAD(&wait->list); - INIT_LIST_HEAD(&wait->tx_head); - INIT_WORK(&wait->iowork, func); - init_waitqueue_head(&wait->wait_dma); - init_waitqueue_head(&wait->wait_pio); - atomic_set(&wait->sdma_busy, 0); - atomic_set(&wait->pio_busy, 0); - wait->tx_limit = tx_limit; - wait->sleep = sleep; - wait->wakeup = wakeup; - wait->sdma_drained = sdma_drained; -} - -/** - * iowait_schedule() - initialize wait structure - * @wait: wait struct to schedule - * @wq: workqueue for schedule - * @cpu: cpu - */ -static inline void iowait_schedule( - struct iowait *wait, - struct workqueue_struct *wq, - int cpu) -{ - queue_work_on(cpu, wq, &wait->iowork); -} - -/** - * iowait_sdma_drain() - wait for DMAs to drain - * - * @wait: iowait structure - * - * This will delay until the iowait sdmas have - * completed. - */ -static inline void iowait_sdma_drain(struct iowait *wait) -{ - wait_event(wait->wait_dma, !atomic_read(&wait->sdma_busy)); -} - -/** - * iowait_sdma_pending() - return sdma pending count - * - * @wait: iowait structure - * - */ -static inline int iowait_sdma_pending(struct iowait *wait) -{ - return atomic_read(&wait->sdma_busy); -} - -/** - * iowait_sdma_inc - note sdma io pending - * @wait: iowait structure - */ -static inline void iowait_sdma_inc(struct iowait *wait) -{ - atomic_inc(&wait->sdma_busy); -} - -/** - * iowait_sdma_add - add count to pending - * @wait: iowait structure - */ -static inline void iowait_sdma_add(struct iowait *wait, int count) -{ - atomic_add(count, &wait->sdma_busy); -} - -/** - * iowait_sdma_dec - note sdma complete - * @wait: iowait structure - */ -static inline int iowait_sdma_dec(struct iowait *wait) -{ - return atomic_dec_and_test(&wait->sdma_busy); -} - -/** - * iowait_pio_drain() - wait for pios to drain - * - * @wait: iowait structure - * - * This will delay until the iowait pios have - * completed. - */ -static inline void iowait_pio_drain(struct iowait *wait) -{ - wait_event_timeout(wait->wait_pio, - !atomic_read(&wait->pio_busy), - HZ); -} - -/** - * iowait_pio_pending() - return pio pending count - * - * @wait: iowait structure - * - */ -static inline int iowait_pio_pending(struct iowait *wait) -{ - return atomic_read(&wait->pio_busy); -} - -/** - * iowait_pio_inc - note pio pending - * @wait: iowait structure - */ -static inline void iowait_pio_inc(struct iowait *wait) -{ - atomic_inc(&wait->pio_busy); -} - -/** - * iowait_sdma_dec - note pio complete - * @wait: iowait structure - */ -static inline int iowait_pio_dec(struct iowait *wait) -{ - return atomic_dec_and_test(&wait->pio_busy); -} - -/** - * iowait_drain_wakeup() - trigger iowait_drain() waiter - * - * @wait: iowait structure - * - * This will trigger any waiters. - */ -static inline void iowait_drain_wakeup(struct iowait *wait) -{ - wake_up(&wait->wait_dma); - wake_up(&wait->wait_pio); - if (wait->sdma_drained) - wait->sdma_drained(wait); -} - -/** - * iowait_get_txhead() - get packet off of iowait list - * - * @wait wait struture - */ -static inline struct sdma_txreq *iowait_get_txhead(struct iowait *wait) -{ - struct sdma_txreq *tx = NULL; - - if (!list_empty(&wait->tx_head)) { - tx = list_first_entry( - &wait->tx_head, - struct sdma_txreq, - list); - list_del_init(&tx->list); - } - return tx; -} - -#endif |