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
147 lines
4.5 KiB
C
147 lines
4.5 KiB
C
/*-
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* Data structures and definitions for SCSI Interface Modules (SIMs).
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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_SIM_H
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#define _CAM_CAM_SIM_H 1
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#ifdef _KERNEL
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/*
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* The sim driver creates a sim for each controller. The sim device
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* queue is separately created in order to allow resource sharing between
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* sims. For instance, a driver may create one sim for each channel of
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* a multi-channel controller and use the same queue for each channel.
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* In this way, the queue resources are shared across all the channels
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* of the multi-channel controller.
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*/
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struct cam_sim;
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struct cam_devq;
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typedef void (*sim_action_func)(struct cam_sim *sim, union ccb *ccb);
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typedef void (*sim_poll_func)(struct cam_sim *sim);
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struct cam_devq * cam_simq_alloc(u_int32_t max_sim_transactions);
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void cam_simq_free(struct cam_devq *devq);
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struct cam_sim * cam_sim_alloc(sim_action_func sim_action,
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sim_poll_func sim_poll,
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const char *sim_name,
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void *softc,
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u_int32_t unit,
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struct mtx *mtx,
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int max_dev_transactions,
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int max_tagged_dev_transactions,
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struct cam_devq *queue);
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void cam_sim_free(struct cam_sim *sim, int free_devq);
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void cam_sim_hold(struct cam_sim *sim);
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void cam_sim_release(struct cam_sim *sim);
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/* Optional sim attributes may be set with these. */
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void cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id);
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/* Convenience routines for accessing sim attributes. */
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static __inline u_int32_t cam_sim_path(struct cam_sim *sim);
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static __inline const char * cam_sim_name(struct cam_sim *sim);
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static __inline void * cam_sim_softc(struct cam_sim *sim);
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static __inline u_int32_t cam_sim_unit(struct cam_sim *sim);
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static __inline u_int32_t cam_sim_bus(struct cam_sim *sim);
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/* Generically useful offsets into the sim private area */
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#define spriv_ptr0 sim_priv.entries[0].ptr
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#define spriv_ptr1 sim_priv.entries[1].ptr
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#define spriv_field0 sim_priv.entries[0].field
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#define spriv_field1 sim_priv.entries[1].field
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/*
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* The sim driver should not access anything directly from this
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* structure.
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*/
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struct cam_sim {
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sim_action_func sim_action;
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sim_poll_func sim_poll;
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const char *sim_name;
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void *softc;
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struct mtx *mtx;
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TAILQ_HEAD(, ccb_hdr) sim_doneq;
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TAILQ_ENTRY(cam_sim) links;
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u_int32_t path_id;/* The Boot device may set this to 0? */
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u_int32_t unit_number;
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u_int32_t bus_id;
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int max_tagged_dev_openings;
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int max_dev_openings;
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u_int32_t flags;
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#define CAM_SIM_REL_TIMEOUT_PENDING 0x01
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#define CAM_SIM_MPSAFE 0x02
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struct callout callout;
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struct cam_devq *devq; /* Device Queue to use for this SIM */
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int refcount; /* References to the SIM. */
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};
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#define CAM_SIM_LOCK(sim) mtx_lock((sim)->mtx)
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#define CAM_SIM_UNLOCK(sim) mtx_unlock((sim)->mtx)
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static __inline u_int32_t
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cam_sim_path(struct cam_sim *sim)
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{
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return (sim->path_id);
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}
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static __inline const char *
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cam_sim_name(struct cam_sim *sim)
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{
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return (sim->sim_name);
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}
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static __inline void *
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cam_sim_softc(struct cam_sim *sim)
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{
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return (sim->softc);
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}
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static __inline u_int32_t
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cam_sim_unit(struct cam_sim *sim)
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{
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return (sim->unit_number);
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}
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static __inline u_int32_t
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cam_sim_bus(struct cam_sim *sim)
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{
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return (sim->bus_id);
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}
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#endif /* _KERNEL */
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#endif /* _CAM_CAM_SIM_H */
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