83c5d981ac
- Unify bus reset/probe sequence. Whenever bus attached at boot or later, CAM will automatically reset and scan it. It allows to remove duplicate code from many drivers. - Any bus, attached before CAM completed it's boot-time initialization, will equally join to the process, delaying boot if needed. - New kern.cam.boot_delay loader tunable should help controllers that are still unable to register their buses in time (such as slow USB/ PCCard/ CardBus devices), by adding one more event to wait on boot. - To allow synchronization between different CAM levels, concept of requests priorities was extended. Priorities now split between several "run levels". Device can be freezed at specified level, allowing higher priority requests to pass. For example, no payload requests allowed, until PMP driver enable port. ATA XPT negotiate transfer parameters, periph driver configure caching and so on. - Frozen requests are no more counted by request allocation scheduler. It fixes deadlocks, when frozen low priority payload requests occupying slots, required by higher levels to manage theit execution. - Two last changes were holding proper ATA reinitialization and error recovery implementation. Now it is done: SATA controllers and Port Multipliers now implement automatic hot-plug and should correctly recover from timeouts and bus resets. - Improve SCSI error recovery for devices on buses without automatic sense reporting, such as ATAPI or USB. For example, it allows CAM to wait, while CD drive loads disk, instead of immediately return error status. - Decapitalize diagnostic messages and make them more readable and sensible. - Teach PMP driver to limit maximum speed on fan-out ports. - Make boot wait for PMP scan completes, and make rescan more reliable. - Fix pass driver, to return CCB to user level in case of error. - Increase number of retries in cd driver, as device may return several UAs.
139 lines
5.0 KiB
C
139 lines
5.0 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_H
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#define _CAM_CAM_XPT_H 1
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/* Forward Declarations */
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union ccb;
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struct cam_periph;
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struct cam_sim;
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/*
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* Definition of a CAM path. Paths are created from bus, target, and lun ids
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* via xpt_create_path and allow for reference to devices without recurring
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* lookups in the edt.
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*/
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struct cam_path;
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/* Path functions */
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#ifdef _KERNEL
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/*
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* Definition of an async handler callback block. These are used to add
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* SIMs and peripherals to the async callback lists.
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*/
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struct async_node {
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SLIST_ENTRY(async_node) links;
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u_int32_t event_enable; /* Async Event enables */
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void (*callback)(void *arg, u_int32_t code,
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struct cam_path *path, void *args);
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void *callback_arg;
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};
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SLIST_HEAD(async_list, async_node);
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SLIST_HEAD(periph_list, cam_periph);
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#if defined(CAM_DEBUG_FLAGS) && !defined(CAMDEBUG)
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#error "You must have options CAMDEBUG to use options CAM_DEBUG_FLAGS"
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#endif
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/*
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* In order to enable the CAM_DEBUG_* options, the user must have CAMDEBUG
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* enabled. Also, the user must have either none, or all of CAM_DEBUG_BUS,
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* CAM_DEBUG_TARGET, and CAM_DEBUG_LUN specified.
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*/
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#if defined(CAM_DEBUG_BUS) || defined(CAM_DEBUG_TARGET) \
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|| defined(CAM_DEBUG_LUN)
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#ifdef CAMDEBUG
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#if !defined(CAM_DEBUG_BUS) || !defined(CAM_DEBUG_TARGET) \
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|| !defined(CAM_DEBUG_LUN)
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#error "You must define all or none of CAM_DEBUG_BUS, CAM_DEBUG_TARGET \
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and CAM_DEBUG_LUN"
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#endif /* !CAM_DEBUG_BUS || !CAM_DEBUG_TARGET || !CAM_DEBUG_LUN */
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#else /* !CAMDEBUG */
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#error "You must use options CAMDEBUG if you use the CAM_DEBUG_* options"
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#endif /* CAMDEBUG */
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#endif /* CAM_DEBUG_BUS || CAM_DEBUG_TARGET || CAM_DEBUG_LUN */
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void xpt_action(union ccb *new_ccb);
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void xpt_action_default(union ccb *new_ccb);
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union ccb *xpt_alloc_ccb(void);
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union ccb *xpt_alloc_ccb_nowait(void);
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void xpt_free_ccb(union ccb *free_ccb);
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void xpt_setup_ccb(struct ccb_hdr *ccb_h,
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struct cam_path *path,
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u_int32_t priority);
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void xpt_merge_ccb(union ccb *master_ccb,
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union ccb *slave_ccb);
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cam_status xpt_create_path(struct cam_path **new_path_ptr,
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struct cam_periph *perph,
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path_id_t path_id,
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target_id_t target_id, lun_id_t lun_id);
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cam_status xpt_create_path_unlocked(struct cam_path **new_path_ptr,
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struct cam_periph *perph,
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path_id_t path_id,
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target_id_t target_id, lun_id_t lun_id);
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void xpt_free_path(struct cam_path *path);
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int xpt_path_comp(struct cam_path *path1,
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struct cam_path *path2);
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void xpt_print_path(struct cam_path *path);
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void xpt_print(struct cam_path *path, const char *fmt, ...);
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int xpt_path_string(struct cam_path *path, char *str,
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size_t str_len);
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path_id_t xpt_path_path_id(struct cam_path *path);
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target_id_t xpt_path_target_id(struct cam_path *path);
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lun_id_t xpt_path_lun_id(struct cam_path *path);
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struct cam_sim *xpt_path_sim(struct cam_path *path);
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struct cam_periph *xpt_path_periph(struct cam_path *path);
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void xpt_async(u_int32_t async_code, struct cam_path *path,
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void *async_arg);
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void xpt_rescan(union ccb *ccb);
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void xpt_hold_boot(void);
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void xpt_release_boot(void);
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void xpt_lock_buses(void);
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void xpt_unlock_buses(void);
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cam_status xpt_register_async(int event, ac_callback_t *cbfunc,
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void *cbarg, struct cam_path *path);
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cam_status xpt_compile_path(struct cam_path *new_path,
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struct cam_periph *perph,
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path_id_t path_id,
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target_id_t target_id,
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lun_id_t lun_id);
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void xpt_release_path(struct cam_path *path);
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#endif /* _KERNEL */
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#endif /* _CAM_CAM_XPT_H */
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