cccf422080
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
55 lines
2.2 KiB
C
55 lines
2.2 KiB
C
/*-
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* Data structures and definitions for dealing with the
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* Common Access Method Transport (xpt) layer.
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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_XPT_SIM_H
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#define _CAM_CAM_XPT_SIM_H 1
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#include <cam/cam_xpt.h>
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#include <cam/cam_queue.h>
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/* Functions accessed by SIM drivers */
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#ifdef _KERNEL
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int32_t xpt_bus_register(struct cam_sim *sim, device_t parent,
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u_int32_t bus);
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int32_t xpt_bus_deregister(path_id_t path_id);
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u_int32_t xpt_freeze_simq(struct cam_sim *sim, u_int count);
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void xpt_release_simq(struct cam_sim *sim, int run_queue);
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u_int32_t xpt_freeze_devq(struct cam_path *path, u_int count);
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void xpt_release_devq(struct cam_path *path,
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u_int count, int run_queue);
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void xpt_done(union ccb *done_ccb);
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void xpt_batch_start(struct cam_sim *sim);
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void xpt_batch_done(struct cam_sim *sim);
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#endif
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#endif /* _CAM_CAM_XPT_SIM_H */
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