^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * hosts.c Copyright (C) 1992 Drew Eckhardt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 1993, 1994, 1995 Eric Youngdale
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2002-2003 Christoph Hellwig
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * mid to lowlevel SCSI driver interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Initial versions: Drew Eckhardt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Subsequent revisions: Eric Youngdale
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * <drew@colorado.edu>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Added QLOGIC QLA1280 SCSI controller kernel host support.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * August 4, 1999 Fred Lewis, Intel DuPont
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Updated to reflect the new initialization scheme for the higher
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * level of scsi drivers (sd/sr/st)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * September 17, 2000 Torben Mathiasen <tmm@image.dk>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * Restructured scsi_host lists and associated functions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * September 04, 2002 Mike Anderson (andmike@us.ibm.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/kthread.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/completion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/transport_class.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <linux/pm_runtime.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <linux/idr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <scsi/scsi_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <scsi/scsi_host.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include <scsi/scsi_transport.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include <scsi/scsi_cmnd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include "scsi_priv.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #include "scsi_logging.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static int shost_eh_deadline = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) module_param_named(eh_deadline, shost_eh_deadline, int, S_IRUGO|S_IWUSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) MODULE_PARM_DESC(eh_deadline,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) "SCSI EH timeout in seconds (should be between 0 and 2^31-1)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) static DEFINE_IDA(host_index_ida);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) static void scsi_host_cls_release(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) put_device(&class_to_shost(dev)->shost_gendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) static struct class shost_class = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) .name = "scsi_host",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) .dev_release = scsi_host_cls_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * scsi_host_set_state - Take the given host through the host state model.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * @shost: scsi host to change the state of.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * @state: state to change to.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * Returns zero if unsuccessful or an error if the requested
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * transition is illegal.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) int scsi_host_set_state(struct Scsi_Host *shost, enum scsi_host_state state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) enum scsi_host_state oldstate = shost->shost_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) if (state == oldstate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) switch (state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) case SHOST_CREATED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) /* There are no legal states that come back to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * created. This is the manually initialised start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) goto illegal;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) case SHOST_RUNNING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) switch (oldstate) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) case SHOST_CREATED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) case SHOST_RECOVERY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) goto illegal;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) case SHOST_RECOVERY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) switch (oldstate) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) case SHOST_RUNNING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) goto illegal;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) case SHOST_CANCEL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) switch (oldstate) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) case SHOST_CREATED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) case SHOST_RUNNING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) case SHOST_CANCEL_RECOVERY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) goto illegal;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) case SHOST_DEL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) switch (oldstate) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) case SHOST_CANCEL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) case SHOST_DEL_RECOVERY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) goto illegal;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) case SHOST_CANCEL_RECOVERY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) switch (oldstate) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) case SHOST_CANCEL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) case SHOST_RECOVERY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) goto illegal;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) case SHOST_DEL_RECOVERY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) switch (oldstate) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) case SHOST_CANCEL_RECOVERY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) goto illegal;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) shost->shost_state = state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) illegal:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) SCSI_LOG_ERROR_RECOVERY(1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) shost_printk(KERN_ERR, shost,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) "Illegal host state transition"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) "%s->%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) scsi_host_state_name(oldstate),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) scsi_host_state_name(state)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) * scsi_remove_host - remove a scsi host
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) * @shost: a pointer to a scsi host to remove
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) void scsi_remove_host(struct Scsi_Host *shost)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) mutex_lock(&shost->scan_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) spin_lock_irqsave(shost->host_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) if (scsi_host_set_state(shost, SHOST_CANCEL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) spin_unlock_irqrestore(shost->host_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) mutex_unlock(&shost->scan_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) spin_unlock_irqrestore(shost->host_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) scsi_autopm_get_host(shost);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) flush_workqueue(shost->tmf_work_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) scsi_forget_host(shost);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) mutex_unlock(&shost->scan_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) scsi_proc_host_rm(shost);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) spin_lock_irqsave(shost->host_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) if (scsi_host_set_state(shost, SHOST_DEL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) BUG_ON(scsi_host_set_state(shost, SHOST_DEL_RECOVERY));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) spin_unlock_irqrestore(shost->host_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) transport_unregister_device(&shost->shost_gendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) device_unregister(&shost->shost_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) device_del(&shost->shost_gendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) EXPORT_SYMBOL(scsi_remove_host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) * scsi_add_host_with_dma - add a scsi host with dma device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) * @shost: scsi host pointer to add
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) * @dev: a struct device of type scsi class
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) * @dma_dev: dma device for the host
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) * Note: You rarely need to worry about this unless you're in a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) * virtualised host environments, so use the simpler scsi_add_host()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) * function instead.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) * Return value:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) * 0 on success / != 0 for error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) struct device *dma_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) struct scsi_host_template *sht = shost->hostt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) int error = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) shost_printk(KERN_INFO, shost, "%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) sht->info ? sht->info(shost) : sht->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) if (!shost->can_queue) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) shost_printk(KERN_ERR, shost,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) "can_queue = 0 no longer supported\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) /* Use min_t(int, ...) in case shost->can_queue exceeds SHRT_MAX */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) shost->cmd_per_lun = min_t(int, shost->cmd_per_lun,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) shost->can_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) error = scsi_init_sense_cache(shost);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) error = scsi_mq_setup_tags(shost);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) if (!shost->shost_gendev.parent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) shost->shost_gendev.parent = dev ? dev : &platform_bus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) if (!dma_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) dma_dev = shost->shost_gendev.parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) shost->dma_dev = dma_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) * Increase usage count temporarily here so that calling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) * scsi_autopm_put_host() will trigger runtime idle if there is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) * nothing else preventing suspending the device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) pm_runtime_get_noresume(&shost->shost_gendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) pm_runtime_set_active(&shost->shost_gendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) pm_runtime_enable(&shost->shost_gendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) device_enable_async_suspend(&shost->shost_gendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) error = device_add(&shost->shost_gendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) goto out_disable_runtime_pm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) scsi_host_set_state(shost, SHOST_RUNNING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) get_device(shost->shost_gendev.parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) device_enable_async_suspend(&shost->shost_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) get_device(&shost->shost_gendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) error = device_add(&shost->shost_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) goto out_del_gendev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) if (shost->transportt->host_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) shost->shost_data = kzalloc(shost->transportt->host_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) if (shost->shost_data == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) error = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) goto out_del_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (shost->transportt->create_work_queue) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) snprintf(shost->work_q_name, sizeof(shost->work_q_name),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) "scsi_wq_%d", shost->host_no);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) shost->work_q = alloc_workqueue("%s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 1, shost->work_q_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) if (!shost->work_q) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) error = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) goto out_del_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) error = scsi_sysfs_add_host(shost);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) goto out_del_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) scsi_proc_host_add(shost);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) scsi_autopm_put_host(shost);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) * Any host allocation in this function will be freed in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) * scsi_host_dev_release().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) out_del_dev:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) device_del(&shost->shost_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) out_del_gendev:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) * Host state is SHOST_RUNNING so we have to explicitly release
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) * ->shost_dev.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) put_device(&shost->shost_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) device_del(&shost->shost_gendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) out_disable_runtime_pm:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) device_disable_async_suspend(&shost->shost_gendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) pm_runtime_disable(&shost->shost_gendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) pm_runtime_set_suspended(&shost->shost_gendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) pm_runtime_put_noidle(&shost->shost_gendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) EXPORT_SYMBOL(scsi_add_host_with_dma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) static void scsi_host_dev_release(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) struct Scsi_Host *shost = dev_to_shost(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) struct device *parent = dev->parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) scsi_proc_hostdir_rm(shost->hostt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) /* Wait for functions invoked through call_rcu(&shost->rcu, ...) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) rcu_barrier();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) if (shost->tmf_work_q)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) destroy_workqueue(shost->tmf_work_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) if (shost->ehandler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) kthread_stop(shost->ehandler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) if (shost->work_q)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) destroy_workqueue(shost->work_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) if (shost->shost_state == SHOST_CREATED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) * Free the shost_dev device name here if scsi_host_alloc()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) * and scsi_host_put() have been called but neither
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) * scsi_host_add() nor scsi_host_remove() has been called.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) * This avoids that the memory allocated for the shost_dev
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) * name is leaked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) kfree(dev_name(&shost->shost_dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) if (shost->tag_set.tags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) scsi_mq_destroy_tags(shost);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) kfree(shost->shost_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) ida_simple_remove(&host_index_ida, shost->host_no);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) if (shost->shost_state != SHOST_CREATED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) put_device(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) kfree(shost);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) static struct device_type scsi_host_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) .name = "scsi_host",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) .release = scsi_host_dev_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) * scsi_host_alloc - register a scsi host adapter instance.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) * @sht: pointer to scsi host template
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) * @privsize: extra bytes to allocate for driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) * Note:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) * Allocate a new Scsi_Host and perform basic initialization.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) * The host is not published to the scsi midlayer until scsi_add_host
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) * is called.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * Return value:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) * Pointer to a new Scsi_Host
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) struct Scsi_Host *shost;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) gfp_t gfp_mask = GFP_KERNEL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) int index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) if (sht->unchecked_isa_dma && privsize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) gfp_mask |= __GFP_DMA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) shost = kzalloc(sizeof(struct Scsi_Host) + privsize, gfp_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) if (!shost)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) shost->host_lock = &shost->default_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) spin_lock_init(shost->host_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) shost->shost_state = SHOST_CREATED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) INIT_LIST_HEAD(&shost->__devices);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) INIT_LIST_HEAD(&shost->__targets);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) INIT_LIST_HEAD(&shost->eh_cmd_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) INIT_LIST_HEAD(&shost->starved_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) init_waitqueue_head(&shost->host_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) mutex_init(&shost->scan_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) index = ida_simple_get(&host_index_ida, 0, 0, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) if (index < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) kfree(shost);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) shost->host_no = index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) shost->dma_channel = 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) /* These three are default values which can be overridden */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) shost->max_channel = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) shost->max_id = 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) shost->max_lun = 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) /* Give each shost a default transportt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) shost->transportt = &blank_transport_template;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) * All drivers right now should be able to handle 12 byte
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) * commands. Every so often there are requests for 16 byte
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) * commands, but individual low-level drivers need to certify that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) * they actually do something sensible with such commands.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) shost->max_cmd_len = 12;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) shost->hostt = sht;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) shost->this_id = sht->this_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) shost->can_queue = sht->can_queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) shost->sg_tablesize = sht->sg_tablesize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) shost->sg_prot_tablesize = sht->sg_prot_tablesize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) shost->cmd_per_lun = sht->cmd_per_lun;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) shost->unchecked_isa_dma = sht->unchecked_isa_dma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) shost->no_write_same = sht->no_write_same;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) shost->host_tagset = sht->host_tagset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) if (shost_eh_deadline == -1 || !sht->eh_host_reset_handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) shost->eh_deadline = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) else if ((ulong) shost_eh_deadline * HZ > INT_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) shost_printk(KERN_WARNING, shost,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) "eh_deadline %u too large, setting to %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) shost_eh_deadline, INT_MAX / HZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) shost->eh_deadline = INT_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) shost->eh_deadline = shost_eh_deadline * HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) if (sht->supported_mode == MODE_UNKNOWN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) /* means we didn't set it ... default to INITIATOR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) shost->active_mode = MODE_INITIATOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) shost->active_mode = sht->supported_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) if (sht->max_host_blocked)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) shost->max_host_blocked = sht->max_host_blocked;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) shost->max_host_blocked = SCSI_DEFAULT_HOST_BLOCKED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) * If the driver imposes no hard sector transfer limit, start at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) * machine infinity initially.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) if (sht->max_sectors)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) shost->max_sectors = sht->max_sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) shost->max_sectors = SCSI_DEFAULT_MAX_SECTORS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) if (sht->max_segment_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) shost->max_segment_size = sht->max_segment_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) shost->max_segment_size = BLK_MAX_SEGMENT_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) * assume a 4GB boundary, if not set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) if (sht->dma_boundary)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) shost->dma_boundary = sht->dma_boundary;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) shost->dma_boundary = 0xffffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) if (sht->virt_boundary_mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) shost->virt_boundary_mask = sht->virt_boundary_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) device_initialize(&shost->shost_gendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) dev_set_name(&shost->shost_gendev, "host%d", shost->host_no);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) shost->shost_gendev.bus = &scsi_bus_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) shost->shost_gendev.type = &scsi_host_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) device_initialize(&shost->shost_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) shost->shost_dev.parent = &shost->shost_gendev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) shost->shost_dev.class = &shost_class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) dev_set_name(&shost->shost_dev, "host%d", shost->host_no);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) shost->shost_dev.groups = scsi_sysfs_shost_attr_groups;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) shost->ehandler = kthread_run(scsi_error_handler, shost,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) "scsi_eh_%d", shost->host_no);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) if (IS_ERR(shost->ehandler)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) shost_printk(KERN_WARNING, shost,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) "error handler thread failed to spawn, error = %ld\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) PTR_ERR(shost->ehandler));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) shost->ehandler = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) shost->tmf_work_q = alloc_workqueue("scsi_tmf_%d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) 1, shost->host_no);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) if (!shost->tmf_work_q) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) shost_printk(KERN_WARNING, shost,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) "failed to create tmf workq\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) scsi_proc_hostdir_add(shost->hostt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) return shost;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) * Host state is still SHOST_CREATED and that is enough to release
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) * ->shost_gendev. scsi_host_dev_release() will free
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) * dev_name(&shost->shost_dev).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) put_device(&shost->shost_gendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) EXPORT_SYMBOL(scsi_host_alloc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) static int __scsi_host_match(struct device *dev, const void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) struct Scsi_Host *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) const unsigned short *hostnum = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) p = class_to_shost(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) return p->host_no == *hostnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) * scsi_host_lookup - get a reference to a Scsi_Host by host no
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) * @hostnum: host number to locate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) * Return value:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) * A pointer to located Scsi_Host or NULL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) * The caller must do a scsi_host_put() to drop the reference
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) * that scsi_host_get() took. The put_device() below dropped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) * the reference from class_find_device().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) struct Scsi_Host *scsi_host_lookup(unsigned short hostnum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) struct device *cdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) struct Scsi_Host *shost = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) cdev = class_find_device(&shost_class, NULL, &hostnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) __scsi_host_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) if (cdev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) shost = scsi_host_get(class_to_shost(cdev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) put_device(cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) return shost;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) EXPORT_SYMBOL(scsi_host_lookup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) * scsi_host_get - inc a Scsi_Host ref count
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) * @shost: Pointer to Scsi_Host to inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) struct Scsi_Host *scsi_host_get(struct Scsi_Host *shost)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) if ((shost->shost_state == SHOST_DEL) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) !get_device(&shost->shost_gendev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) return shost;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) EXPORT_SYMBOL(scsi_host_get);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) static bool scsi_host_check_in_flight(struct request *rq, void *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) bool reserved)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) int *count = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) if (test_bit(SCMD_STATE_INFLIGHT, &cmd->state))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) (*count)++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) * scsi_host_busy - Return the host busy counter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) * @shost: Pointer to Scsi_Host to inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) int scsi_host_busy(struct Scsi_Host *shost)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) int cnt = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) blk_mq_tagset_busy_iter(&shost->tag_set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) scsi_host_check_in_flight, &cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) return cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) EXPORT_SYMBOL(scsi_host_busy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) * scsi_host_put - dec a Scsi_Host ref count
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) * @shost: Pointer to Scsi_Host to dec.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) void scsi_host_put(struct Scsi_Host *shost)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) put_device(&shost->shost_gendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) EXPORT_SYMBOL(scsi_host_put);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) int scsi_init_hosts(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) return class_register(&shost_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) void scsi_exit_hosts(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) class_unregister(&shost_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) ida_destroy(&host_index_ida);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) int scsi_is_host_device(const struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) return dev->type == &scsi_host_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) EXPORT_SYMBOL(scsi_is_host_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) * scsi_queue_work - Queue work to the Scsi_Host workqueue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) * @shost: Pointer to Scsi_Host.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) * @work: Work to queue for execution.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) * Return value:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) * 1 - work queued for execution
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) * 0 - work is already queued
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) * -EINVAL - work queue doesn't exist
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) int scsi_queue_work(struct Scsi_Host *shost, struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) if (unlikely(!shost->work_q)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) shost_printk(KERN_ERR, shost,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) "ERROR: Scsi host '%s' attempted to queue scsi-work, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) "when no workqueue created.\n", shost->hostt->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) dump_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) return queue_work(shost->work_q, work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) EXPORT_SYMBOL_GPL(scsi_queue_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) * scsi_flush_work - Flush a Scsi_Host's workqueue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) * @shost: Pointer to Scsi_Host.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) void scsi_flush_work(struct Scsi_Host *shost)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) if (!shost->work_q) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) shost_printk(KERN_ERR, shost,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) "ERROR: Scsi host '%s' attempted to flush scsi-work, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) "when no workqueue created.\n", shost->hostt->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) dump_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) flush_workqueue(shost->work_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) EXPORT_SYMBOL_GPL(scsi_flush_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) static bool complete_all_cmds_iter(struct request *rq, void *data, bool rsvd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(rq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) int status = *(int *)data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) scsi_dma_unmap(scmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) scmd->result = status << 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) scmd->scsi_done(scmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) * scsi_host_complete_all_commands - Terminate all running commands
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) * @shost: Scsi Host on which commands should be terminated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) * @status: Status to be set for the terminated commands
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) * There is no protection against modification of the number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) * of outstanding commands. It is the responsibility of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) * caller to ensure that concurrent I/O submission and/or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) * completion is stopped when calling this function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) void scsi_host_complete_all_commands(struct Scsi_Host *shost, int status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) blk_mq_tagset_busy_iter(&shost->tag_set, complete_all_cmds_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) &status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) EXPORT_SYMBOL_GPL(scsi_host_complete_all_commands);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) struct scsi_host_busy_iter_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) bool (*fn)(struct scsi_cmnd *, void *, bool);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) void *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) static bool __scsi_host_busy_iter_fn(struct request *req, void *priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) bool reserved)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) struct scsi_host_busy_iter_data *iter_data = priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) struct scsi_cmnd *sc = blk_mq_rq_to_pdu(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) return iter_data->fn(sc, iter_data->priv, reserved);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) * scsi_host_busy_iter - Iterate over all busy commands
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) * @shost: Pointer to Scsi_Host.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) * @fn: Function to call on each busy command
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) * @priv: Data pointer passed to @fn
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) * If locking against concurrent command completions is required
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) * ithas to be provided by the caller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) void scsi_host_busy_iter(struct Scsi_Host *shost,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) bool (*fn)(struct scsi_cmnd *, void *, bool),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) void *priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) struct scsi_host_busy_iter_data iter_data = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) .fn = fn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) .priv = priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) blk_mq_tagset_busy_iter(&shost->tag_set, __scsi_host_busy_iter_fn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) &iter_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) EXPORT_SYMBOL_GPL(scsi_host_busy_iter);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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