// SPDX-License-Identifier: GPL-2.0-only /* * hosts.c Copyright (C) 1992 Drew Eckhardt * Copyright (C) 1993, 1994, 1995 Eric Youngdale * Copyright (C) 2002-2003 Christoph Hellwig * * mid to lowlevel SCSI driver interface * Initial versions: Drew Eckhardt * Subsequent revisions: Eric Youngdale * * <[email protected]> * * Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli * Added QLOGIC QLA1280 SCSI controller kernel host support. * August 4, 1999 Fred Lewis, Intel DuPont * * Updated to reflect the new initialization scheme for the higher * level of scsi drivers (sd/sr/st) * September 17, 2000 Torben Mathiasen <[email protected]> * * Restructured scsi_host lists and associated functions. * September 04, 2002 Mike Anderson ([email protected]) */ #include <linux/module.h> #include <linux/blkdev.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/kthread.h> #include <linux/string.h> #include <linux/mm.h> #include <linux/init.h> #include <linux/completion.h> #include <linux/transport_class.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/idr.h> #include <scsi/scsi_device.h> #include <scsi/scsi_host.h> #include <scsi/scsi_transport.h> #include <scsi/scsi_cmnd.h> #include "scsi_priv.h" #include "scsi_logging.h" static int shost_eh_deadline = …; module_param_named(eh_deadline, shost_eh_deadline, int, S_IRUGO|S_IWUSR); MODULE_PARM_DESC(…) …; static DEFINE_IDA(host_index_ida); static void scsi_host_cls_release(struct device *dev) { … } static struct class shost_class = …; /** * scsi_host_set_state - Take the given host through the host state model. * @shost: scsi host to change the state of. * @state: state to change to. * * Returns zero if unsuccessful or an error if the requested * transition is illegal. **/ int scsi_host_set_state(struct Scsi_Host *shost, enum scsi_host_state state) { … } /** * scsi_remove_host - remove a scsi host * @shost: a pointer to a scsi host to remove **/ void scsi_remove_host(struct Scsi_Host *shost) { … } EXPORT_SYMBOL(…); /** * scsi_add_host_with_dma - add a scsi host with dma device * @shost: scsi host pointer to add * @dev: a struct device of type scsi class * @dma_dev: dma device for the host * * Note: You rarely need to worry about this unless you're in a * virtualised host environments, so use the simpler scsi_add_host() * function instead. * * Return value: * 0 on success / != 0 for error **/ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev, struct device *dma_dev) { … } EXPORT_SYMBOL(…); static void scsi_host_dev_release(struct device *dev) { … } static const struct device_type scsi_host_type = …; /** * scsi_host_alloc - register a scsi host adapter instance. * @sht: pointer to scsi host template * @privsize: extra bytes to allocate for driver * * Note: * Allocate a new Scsi_Host and perform basic initialization. * The host is not published to the scsi midlayer until scsi_add_host * is called. * * Return value: * Pointer to a new Scsi_Host **/ struct Scsi_Host *scsi_host_alloc(const struct scsi_host_template *sht, int privsize) { … } EXPORT_SYMBOL(…); static int __scsi_host_match(struct device *dev, const void *data) { … } /** * scsi_host_lookup - get a reference to a Scsi_Host by host no * @hostnum: host number to locate * * Return value: * A pointer to located Scsi_Host or NULL. * * The caller must do a scsi_host_put() to drop the reference * that scsi_host_get() took. The put_device() below dropped * the reference from class_find_device(). **/ struct Scsi_Host *scsi_host_lookup(unsigned int hostnum) { … } EXPORT_SYMBOL(…); /** * scsi_host_get - inc a Scsi_Host ref count * @shost: Pointer to Scsi_Host to inc. **/ struct Scsi_Host *scsi_host_get(struct Scsi_Host *shost) { … } EXPORT_SYMBOL(…); static bool scsi_host_check_in_flight(struct request *rq, void *data) { … } /** * scsi_host_busy - Return the host busy counter * @shost: Pointer to Scsi_Host to inc. **/ int scsi_host_busy(struct Scsi_Host *shost) { … } EXPORT_SYMBOL(…); /** * scsi_host_put - dec a Scsi_Host ref count * @shost: Pointer to Scsi_Host to dec. **/ void scsi_host_put(struct Scsi_Host *shost) { … } EXPORT_SYMBOL(…); int scsi_init_hosts(void) { … } void scsi_exit_hosts(void) { … } int scsi_is_host_device(const struct device *dev) { … } EXPORT_SYMBOL(…); /** * scsi_queue_work - Queue work to the Scsi_Host workqueue. * @shost: Pointer to Scsi_Host. * @work: Work to queue for execution. * * Return value: * 1 - work queued for execution * 0 - work is already queued * -EINVAL - work queue doesn't exist **/ int scsi_queue_work(struct Scsi_Host *shost, struct work_struct *work) { … } EXPORT_SYMBOL_GPL(…); /** * scsi_flush_work - Flush a Scsi_Host's workqueue. * @shost: Pointer to Scsi_Host. **/ void scsi_flush_work(struct Scsi_Host *shost) { … } EXPORT_SYMBOL_GPL(…); static bool complete_all_cmds_iter(struct request *rq, void *data) { … } /** * scsi_host_complete_all_commands - Terminate all running commands * @shost: Scsi Host on which commands should be terminated * @status: Status to be set for the terminated commands * * There is no protection against modification of the number * of outstanding commands. It is the responsibility of the * caller to ensure that concurrent I/O submission and/or * completion is stopped when calling this function. */ void scsi_host_complete_all_commands(struct Scsi_Host *shost, enum scsi_host_status status) { … } EXPORT_SYMBOL_GPL(…); struct scsi_host_busy_iter_data { … }; static bool __scsi_host_busy_iter_fn(struct request *req, void *priv) { … } /** * scsi_host_busy_iter - Iterate over all busy commands * @shost: Pointer to Scsi_Host. * @fn: Function to call on each busy command * @priv: Data pointer passed to @fn * * If locking against concurrent command completions is required * ithas to be provided by the caller **/ void scsi_host_busy_iter(struct Scsi_Host *shost, bool (*fn)(struct scsi_cmnd *, void *), void *priv) { … } EXPORT_SYMBOL_GPL(…);
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