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f049cf1a7b
As explained during the 2018 LSF/MM session about increasing SCSI disk
probing concurrency, the problems with the current probing approach are as
follows:
- The driver core is unaware of asynchronous SCSI LUN probing.
wait_for_device_probe() waits for all asynchronous probes except
asynchronous SCSI disk probes.
- There is unnecessary serialization between sd_probe() and sd_remove().
This can lead to a deadlock.
Hence this patch that modifies the sd driver such that it uses the driver
core framework for asynchronous probing. The async domain and
get_device()/put_device() pairs that became superfluous due to this change
are removed.
This patch does not affect the time needed for loading the scsi_debug
kernel module with parameters delay=0 and max_luns=256.
This patch depends on commit ef0ff68351 ("driver core: Probe devices
asynchronously instead of the driver") that went upstream in kernel version
v5.1-rc1.
Cc: Lee Duncan <lduncan@suse.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
196 lines
6.5 KiB
C
196 lines
6.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _SCSI_PRIV_H
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#define _SCSI_PRIV_H
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#include <linux/device.h>
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#include <linux/async.h>
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#include <scsi/scsi_device.h>
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struct request_queue;
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struct request;
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struct scsi_cmnd;
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struct scsi_device;
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struct scsi_target;
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struct scsi_host_template;
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struct Scsi_Host;
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struct scsi_nl_hdr;
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/*
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* Scsi Error Handler Flags
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*/
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#define SCSI_EH_ABORT_SCHEDULED 0x0002 /* Abort has been scheduled */
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#define SCSI_SENSE_VALID(scmd) \
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(((scmd)->sense_buffer[0] & 0x70) == 0x70)
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/* hosts.c */
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extern int scsi_init_hosts(void);
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extern void scsi_exit_hosts(void);
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/* scsi.c */
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extern bool scsi_use_blk_mq;
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int scsi_init_sense_cache(struct Scsi_Host *shost);
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void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd);
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#ifdef CONFIG_SCSI_LOGGING
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void scsi_log_send(struct scsi_cmnd *cmd);
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void scsi_log_completion(struct scsi_cmnd *cmd, int disposition);
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#else
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static inline void scsi_log_send(struct scsi_cmnd *cmd)
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{ };
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static inline void scsi_log_completion(struct scsi_cmnd *cmd, int disposition)
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{ };
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#endif
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/* scsi_devinfo.c */
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/* list of keys for the lists */
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enum scsi_devinfo_key {
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SCSI_DEVINFO_GLOBAL = 0,
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SCSI_DEVINFO_SPI,
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};
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extern blist_flags_t scsi_get_device_flags(struct scsi_device *sdev,
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const unsigned char *vendor,
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const unsigned char *model);
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extern blist_flags_t scsi_get_device_flags_keyed(struct scsi_device *sdev,
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const unsigned char *vendor,
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const unsigned char *model,
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enum scsi_devinfo_key key);
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extern int scsi_dev_info_list_add_keyed(int compatible, char *vendor,
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char *model, char *strflags,
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blist_flags_t flags,
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enum scsi_devinfo_key key);
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extern int scsi_dev_info_list_del_keyed(char *vendor, char *model,
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enum scsi_devinfo_key key);
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extern int scsi_dev_info_add_list(enum scsi_devinfo_key key, const char *name);
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extern int scsi_dev_info_remove_list(enum scsi_devinfo_key key);
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extern int __init scsi_init_devinfo(void);
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extern void scsi_exit_devinfo(void);
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/* scsi_error.c */
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extern void scmd_eh_abort_handler(struct work_struct *work);
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extern enum blk_eh_timer_return scsi_times_out(struct request *req);
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extern int scsi_error_handler(void *host);
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extern int scsi_decide_disposition(struct scsi_cmnd *cmd);
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extern void scsi_eh_wakeup(struct Scsi_Host *shost);
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extern void scsi_eh_scmd_add(struct scsi_cmnd *);
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void scsi_eh_ready_devs(struct Scsi_Host *shost,
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struct list_head *work_q,
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struct list_head *done_q);
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int scsi_eh_get_sense(struct list_head *work_q,
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struct list_head *done_q);
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int scsi_noretry_cmd(struct scsi_cmnd *scmd);
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/* scsi_lib.c */
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extern void scsi_add_cmd_to_list(struct scsi_cmnd *cmd);
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extern void scsi_del_cmd_from_list(struct scsi_cmnd *cmd);
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extern int scsi_maybe_unblock_host(struct scsi_device *sdev);
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extern void scsi_device_unbusy(struct scsi_device *sdev);
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extern void scsi_queue_insert(struct scsi_cmnd *cmd, int reason);
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extern void scsi_io_completion(struct scsi_cmnd *, unsigned int);
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extern void scsi_run_host_queues(struct Scsi_Host *shost);
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extern void scsi_requeue_run_queue(struct work_struct *work);
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extern struct request_queue *scsi_mq_alloc_queue(struct scsi_device *sdev);
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extern void scsi_start_queue(struct scsi_device *sdev);
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extern int scsi_mq_setup_tags(struct Scsi_Host *shost);
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extern void scsi_mq_destroy_tags(struct Scsi_Host *shost);
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extern int scsi_init_queue(void);
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extern void scsi_exit_queue(void);
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extern void scsi_evt_thread(struct work_struct *work);
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struct request_queue;
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struct request;
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/* scsi_proc.c */
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#ifdef CONFIG_SCSI_PROC_FS
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extern void scsi_proc_hostdir_add(struct scsi_host_template *);
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extern void scsi_proc_hostdir_rm(struct scsi_host_template *);
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extern void scsi_proc_host_add(struct Scsi_Host *);
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extern void scsi_proc_host_rm(struct Scsi_Host *);
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extern int scsi_init_procfs(void);
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extern void scsi_exit_procfs(void);
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#else
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# define scsi_proc_hostdir_add(sht) do { } while (0)
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# define scsi_proc_hostdir_rm(sht) do { } while (0)
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# define scsi_proc_host_add(shost) do { } while (0)
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# define scsi_proc_host_rm(shost) do { } while (0)
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# define scsi_init_procfs() (0)
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# define scsi_exit_procfs() do { } while (0)
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#endif /* CONFIG_PROC_FS */
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/* scsi_scan.c */
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extern char scsi_scan_type[];
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extern int scsi_complete_async_scans(void);
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extern int scsi_scan_host_selected(struct Scsi_Host *, unsigned int,
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unsigned int, u64, enum scsi_scan_mode);
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extern void scsi_forget_host(struct Scsi_Host *);
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extern void scsi_rescan_device(struct device *);
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/* scsi_sysctl.c */
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#ifdef CONFIG_SYSCTL
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extern int scsi_init_sysctl(void);
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extern void scsi_exit_sysctl(void);
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#else
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# define scsi_init_sysctl() (0)
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# define scsi_exit_sysctl() do { } while (0)
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#endif /* CONFIG_SYSCTL */
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/* scsi_sysfs.c */
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extern int scsi_sysfs_add_sdev(struct scsi_device *);
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extern int scsi_sysfs_add_host(struct Scsi_Host *);
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extern int scsi_sysfs_register(void);
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extern void scsi_sysfs_unregister(void);
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extern void scsi_sysfs_device_initialize(struct scsi_device *);
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extern int scsi_sysfs_target_initialize(struct scsi_device *);
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extern struct scsi_transport_template blank_transport_template;
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extern void __scsi_remove_device(struct scsi_device *);
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extern struct bus_type scsi_bus_type;
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extern const struct attribute_group *scsi_sysfs_shost_attr_groups[];
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/* scsi_netlink.c */
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#ifdef CONFIG_SCSI_NETLINK
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extern void scsi_netlink_init(void);
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extern void scsi_netlink_exit(void);
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extern struct sock *scsi_nl_sock;
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#else
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static inline void scsi_netlink_init(void) {}
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static inline void scsi_netlink_exit(void) {}
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#endif
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/* scsi_pm.c */
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#ifdef CONFIG_PM
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extern const struct dev_pm_ops scsi_bus_pm_ops;
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extern void scsi_autopm_get_target(struct scsi_target *);
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extern void scsi_autopm_put_target(struct scsi_target *);
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extern int scsi_autopm_get_host(struct Scsi_Host *);
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extern void scsi_autopm_put_host(struct Scsi_Host *);
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#else
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static inline void scsi_autopm_get_target(struct scsi_target *t) {}
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static inline void scsi_autopm_put_target(struct scsi_target *t) {}
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static inline int scsi_autopm_get_host(struct Scsi_Host *h) { return 0; }
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static inline void scsi_autopm_put_host(struct Scsi_Host *h) {}
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#endif /* CONFIG_PM */
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extern struct async_domain scsi_sd_pm_domain;
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/* scsi_dh.c */
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#ifdef CONFIG_SCSI_DH
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void scsi_dh_add_device(struct scsi_device *sdev);
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void scsi_dh_release_device(struct scsi_device *sdev);
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#else
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static inline void scsi_dh_add_device(struct scsi_device *sdev) { }
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static inline void scsi_dh_release_device(struct scsi_device *sdev) { }
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#endif
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/*
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* internal scsi timeout functions: for use by mid-layer and transport
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* classes.
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*/
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#define SCSI_DEVICE_BLOCK_MAX_TIMEOUT 600 /* units in seconds */
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#endif /* _SCSI_PRIV_H */
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