cd4455d638
locking support for CAM r256826: Fix several target mode SIMs to not blindly clear ccb_h.flags field of ATIO CCBs. Not all CCB flags there belong to them. r256836: Remove hard limit on number of BIOs handled with one ATA TRIM request. r256843: Merge CAM locking changes from the projects/camlock branch to radically reduce lock congestion and improve SMP scalability of the SCSI/ATA stack, preparing the ground for the coming next GEOM direct dispatch support. r256888: Unconditionally acquire periph reference on CCB allocation failure. r256895: Fix memory and references leak due to unfreed path. r256960: Move CAM_UNQUEUED_INDEX setting to the last moment and under the periph lock. This fixes race condition with cam_periph_ccbwait(), causing use-after-free. r256975: Minor (mostly cosmetical) addition to r256960. r257054: Some microoptimizations for da and ada drivers: - Replace ordered_tag_count counter with single flag; - From da remove outstanding_cmds counter, duplicating pending_ccbs list; - From da_softc remove unused links field. r257482: Fix lock recursion, triggered by `smartctl -a /dev/adaX`. r257501: Make getenv_*() functions and respectively TUNABLE_*_FETCH() macros not allocate memory and so not require sleepable environment. getenv() has already used on-stack temporary storage, so just use it more rationally. getenv_string() receives buffer as argument, so don't need another one. r257914: Some CAM locks polishing: - Fix LOR and possible lock recursion when handling high-power commands. Introduce new lock to protect left power quota and list of frozen devices. - Correct locking around xpt periph creation. - Remove seems never used XPT_FLAG_OPEN xpt periph flag. Again, Netflix assisted with testing the merge, but all of the credit goes to Alexander and iX Systems. Submitted by: mav Sponsored by: iX Systems
138 lines
5.1 KiB
C
138 lines
5.1 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_ed;
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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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u_int32_t event_lock; /* Take SIM lock for handlers. */
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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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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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int xpt_getattr(char *buf, size_t len, const char *attr,
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struct cam_path *path);
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void xpt_free_path(struct cam_path *path);
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void xpt_path_counts(struct cam_path *path, uint32_t *bus_ref,
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uint32_t *periph_ref, uint32_t *target_ref,
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uint32_t *device_ref);
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int xpt_path_comp(struct cam_path *path1,
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struct cam_path *path2);
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int xpt_path_comp_dev(struct cam_path *path,
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struct cam_ed *dev);
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void xpt_print_path(struct cam_path *path);
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void xpt_print_device(struct cam_ed *device);
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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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int xpt_path_legacy_ata_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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struct mtx * xpt_path_mtx(struct cam_path *path);
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#define xpt_path_lock(path) mtx_lock(xpt_path_mtx(path))
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#define xpt_path_unlock(path) mtx_unlock(xpt_path_mtx(path))
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#define xpt_path_assert(path, what) mtx_assert(xpt_path_mtx(path), (what))
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#define xpt_path_owned(path) mtx_owned(xpt_path_mtx(path))
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#define xpt_path_sleep(path, chan, priority, wmesg, timo) \
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msleep((chan), xpt_path_mtx(path), (priority), (wmesg), (timo))
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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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cam_status xpt_clone_path(struct cam_path **new_path,
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struct cam_path *path);
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void xpt_copy_path(struct cam_path *new_path,
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struct cam_path *path);
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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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