r248917, r248918, r248978, r249001, r249014, r249030: Remove multilevel freezing mechanism, implemented to handle specifics of the ATA/SATA error recovery, when post-reset recovery commands should be allocated when queues are already full of payload requests. Instead of removing frozen CCBs with specified range of priorities from the queue to provide free openings, use simple hack, allowing explicit CCBs over- allocation for requests with priority higher (numerically lower) then CAM_PRIORITY_OOB threshold. Simplify CCB allocation logic by removing SIM-level allocation queue. After that SIM-level queue manages only CCBs execution, while allocation logic is localized within each single device. Suggested by: gibbs
248 lines
6.2 KiB
C
248 lines
6.2 KiB
C
/*-
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* CAM request queue management definitions.
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*
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* Copyright (c) 1997 Justin T. Gibbs.
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* All rights reserved.
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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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* 1. 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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* without modification, immediately at the beginning of the file.
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* 2. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _CAM_CAM_QUEUE_H
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#define _CAM_CAM_QUEUE_H 1
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#ifdef _KERNEL
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#include <sys/queue.h>
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#include <cam/cam.h>
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/*
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* This structure implements a heap based priority queue. The queue
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* assumes that the objects stored in it begin with a cam_qentry
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* structure holding the priority information used to sort the objects.
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* This structure is opaque to clients (outside of the XPT layer) to allow
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* the implementation to change without affecting them.
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*/
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struct camq {
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cam_pinfo **queue_array;
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int array_size;
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int entries;
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u_int32_t generation;
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u_int32_t qfrozen_cnt;
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};
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TAILQ_HEAD(ccb_hdr_tailq, ccb_hdr);
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LIST_HEAD(ccb_hdr_list, ccb_hdr);
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SLIST_HEAD(ccb_hdr_slist, ccb_hdr);
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struct cam_ccbq {
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struct camq queue;
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int devq_openings;
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int devq_allocating;
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int dev_openings;
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int dev_active;
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int held;
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};
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struct cam_ed;
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struct cam_devq {
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struct camq send_queue;
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int send_openings;
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int send_active;
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};
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struct cam_devq *cam_devq_alloc(int devices, int openings);
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int cam_devq_init(struct cam_devq *devq, int devices,
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int openings);
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void cam_devq_free(struct cam_devq *devq);
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u_int32_t cam_devq_resize(struct cam_devq *camq, int openings);
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/*
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* Allocate a cam_ccb_queue structure and initialize it.
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*/
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struct cam_ccbq *cam_ccbq_alloc(int openings);
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u_int32_t cam_ccbq_resize(struct cam_ccbq *ccbq, int devices);
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int cam_ccbq_init(struct cam_ccbq *ccbq, int openings);
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void cam_ccbq_free(struct cam_ccbq *ccbq);
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void cam_ccbq_fini(struct cam_ccbq *ccbq);
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/*
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* Allocate and initialize a cam_queue structure.
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*/
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struct camq *camq_alloc(int size);
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/*
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* Resize a cam queue
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*/
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u_int32_t camq_resize(struct camq *queue, int new_size);
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/*
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* Initialize a camq structure. Return 0 on success, 1 on failure.
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*/
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int camq_init(struct camq *camq, int size);
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/*
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* Free a cam_queue structure. This should only be called if a controller
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* driver failes somehow during its attach routine or is unloaded and has
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* obtained a cam_queue structure.
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*/
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void camq_free(struct camq *queue);
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/*
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* Finialize any internal storage or state of a cam_queue.
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*/
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void camq_fini(struct camq *queue);
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/*
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* cam_queue_insert: Given a CAM queue with at least one open spot,
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* insert the new entry maintaining order.
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*/
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void camq_insert(struct camq *queue, cam_pinfo *new_entry);
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/*
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* camq_remove: Remove and arbitrary entry from the queue maintaining
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* queue order.
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*/
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cam_pinfo *camq_remove(struct camq *queue, int index);
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#define CAMQ_HEAD 1 /* Head of queue index */
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/* Index the first element in the heap */
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#define CAMQ_GET_HEAD(camq) ((camq)->queue_array[CAMQ_HEAD])
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/* Get the first element priority. */
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#define CAMQ_GET_PRIO(camq) (((camq)->entries > 0) ? \
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((camq)->queue_array[CAMQ_HEAD]->priority) : 0)
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/*
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* camq_change_priority: Raise or lower the priority of an entry
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* maintaining queue order.
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*/
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void camq_change_priority(struct camq *queue, int index,
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u_int32_t new_priority);
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static __inline int
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cam_ccbq_pending_ccb_count(struct cam_ccbq *ccbq);
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static __inline void
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cam_ccbq_take_opening(struct cam_ccbq *ccbq);
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static __inline int
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cam_ccbq_insert_ccb(struct cam_ccbq *ccbq, union ccb *new_ccb);
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static __inline int
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cam_ccbq_remove_ccb(struct cam_ccbq *ccbq, union ccb *ccb);
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static __inline union ccb *
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cam_ccbq_peek_ccb(struct cam_ccbq *ccbq, int index);
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static __inline void
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cam_ccbq_send_ccb(struct cam_ccbq *queue, union ccb *send_ccb);
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static __inline void
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cam_ccbq_ccb_done(struct cam_ccbq *ccbq, union ccb *done_ccb);
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static __inline void
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cam_ccbq_release_opening(struct cam_ccbq *ccbq);
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static __inline int
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cam_ccbq_pending_ccb_count(struct cam_ccbq *ccbq)
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{
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return (ccbq->queue.entries);
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}
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static __inline void
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cam_ccbq_take_opening(struct cam_ccbq *ccbq)
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{
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ccbq->devq_openings--;
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ccbq->held++;
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}
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static __inline int
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cam_ccbq_insert_ccb(struct cam_ccbq *ccbq, union ccb *new_ccb)
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{
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ccbq->held--;
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camq_insert(&ccbq->queue, &new_ccb->ccb_h.pinfo);
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if (ccbq->queue.qfrozen_cnt > 0) {
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ccbq->devq_openings++;
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ccbq->held++;
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return (1);
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} else
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return (0);
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}
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static __inline int
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cam_ccbq_remove_ccb(struct cam_ccbq *ccbq, union ccb *ccb)
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{
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camq_remove(&ccbq->queue, ccb->ccb_h.pinfo.index);
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if (ccbq->queue.qfrozen_cnt > 0) {
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ccbq->devq_openings--;
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ccbq->held--;
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return (1);
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} else
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return (0);
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}
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static __inline union ccb *
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cam_ccbq_peek_ccb(struct cam_ccbq *ccbq, int index)
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{
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return((union ccb *)ccbq->queue.queue_array[index]);
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}
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static __inline void
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cam_ccbq_send_ccb(struct cam_ccbq *ccbq, union ccb *send_ccb)
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{
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send_ccb->ccb_h.pinfo.index = CAM_ACTIVE_INDEX;
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ccbq->dev_active++;
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ccbq->dev_openings--;
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}
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static __inline void
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cam_ccbq_ccb_done(struct cam_ccbq *ccbq, union ccb *done_ccb)
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{
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ccbq->dev_active--;
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ccbq->dev_openings++;
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ccbq->held++;
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}
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static __inline void
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cam_ccbq_release_opening(struct cam_ccbq *ccbq)
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{
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ccbq->held--;
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ccbq->devq_openings++;
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}
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#endif /* _KERNEL */
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#endif /* _CAM_CAM_QUEUE_H */
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