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720 lines
18 KiB
720 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* hosts.c Copyright (C) 1992 Drew Eckhardt |
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* Copyright (C) 1993, 1994, 1995 Eric Youngdale |
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* Copyright (C) 2002-2003 Christoph Hellwig |
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* |
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* mid to lowlevel SCSI driver interface |
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* Initial versions: Drew Eckhardt |
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* Subsequent revisions: Eric Youngdale |
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* |
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* <[email protected]> |
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* |
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* Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli |
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* Added QLOGIC QLA1280 SCSI controller kernel host support. |
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* August 4, 1999 Fred Lewis, Intel DuPont |
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* |
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* Updated to reflect the new initialization scheme for the higher |
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* level of scsi drivers (sd/sr/st) |
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* September 17, 2000 Torben Mathiasen <[email protected]> |
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* |
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* Restructured scsi_host lists and associated functions. |
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* September 04, 2002 Mike Anderson ([email protected]) |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/blkdev.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/kthread.h> |
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#include <linux/string.h> |
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#include <linux/mm.h> |
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#include <linux/init.h> |
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#include <linux/completion.h> |
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#include <linux/transport_class.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/idr.h> |
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#include <scsi/scsi_device.h> |
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#include <scsi/scsi_host.h> |
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#include <scsi/scsi_transport.h> |
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#include <scsi/scsi_cmnd.h> |
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|
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#include "scsi_priv.h" |
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#include "scsi_logging.h" |
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static int shost_eh_deadline = -1; |
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|
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module_param_named(eh_deadline, shost_eh_deadline, int, S_IRUGO|S_IWUSR); |
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MODULE_PARM_DESC(eh_deadline, |
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"SCSI EH timeout in seconds (should be between 0 and 2^31-1)"); |
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|
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static DEFINE_IDA(host_index_ida); |
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static void scsi_host_cls_release(struct device *dev) |
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{ |
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put_device(&class_to_shost(dev)->shost_gendev); |
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} |
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|
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static struct class shost_class = { |
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.name = "scsi_host", |
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.dev_release = scsi_host_cls_release, |
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}; |
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|
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/** |
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* scsi_host_set_state - Take the given host through the host state model. |
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* @shost: scsi host to change the state of. |
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* @state: state to change to. |
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* |
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* Returns zero if unsuccessful or an error if the requested |
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* transition is illegal. |
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**/ |
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int scsi_host_set_state(struct Scsi_Host *shost, enum scsi_host_state state) |
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{ |
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enum scsi_host_state oldstate = shost->shost_state; |
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if (state == oldstate) |
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return 0; |
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switch (state) { |
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case SHOST_CREATED: |
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/* There are no legal states that come back to |
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* created. This is the manually initialised start |
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* state */ |
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goto illegal; |
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case SHOST_RUNNING: |
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switch (oldstate) { |
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case SHOST_CREATED: |
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case SHOST_RECOVERY: |
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break; |
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default: |
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goto illegal; |
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} |
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break; |
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|
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case SHOST_RECOVERY: |
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switch (oldstate) { |
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case SHOST_RUNNING: |
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break; |
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default: |
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goto illegal; |
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} |
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break; |
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|
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case SHOST_CANCEL: |
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switch (oldstate) { |
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case SHOST_CREATED: |
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case SHOST_RUNNING: |
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case SHOST_CANCEL_RECOVERY: |
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break; |
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default: |
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goto illegal; |
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} |
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break; |
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case SHOST_DEL: |
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switch (oldstate) { |
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case SHOST_CANCEL: |
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case SHOST_DEL_RECOVERY: |
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break; |
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default: |
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goto illegal; |
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} |
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break; |
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|
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case SHOST_CANCEL_RECOVERY: |
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switch (oldstate) { |
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case SHOST_CANCEL: |
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case SHOST_RECOVERY: |
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break; |
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default: |
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goto illegal; |
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} |
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break; |
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|
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case SHOST_DEL_RECOVERY: |
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switch (oldstate) { |
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case SHOST_CANCEL_RECOVERY: |
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break; |
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default: |
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goto illegal; |
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} |
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break; |
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} |
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shost->shost_state = state; |
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return 0; |
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illegal: |
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SCSI_LOG_ERROR_RECOVERY(1, |
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shost_printk(KERN_ERR, shost, |
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"Illegal host state transition" |
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"%s->%s\n", |
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scsi_host_state_name(oldstate), |
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scsi_host_state_name(state))); |
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return -EINVAL; |
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} |
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|
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/** |
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* scsi_remove_host - remove a scsi host |
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* @shost: a pointer to a scsi host to remove |
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**/ |
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void scsi_remove_host(struct Scsi_Host *shost) |
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{ |
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unsigned long flags; |
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mutex_lock(&shost->scan_mutex); |
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spin_lock_irqsave(shost->host_lock, flags); |
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if (scsi_host_set_state(shost, SHOST_CANCEL)) |
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if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) { |
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spin_unlock_irqrestore(shost->host_lock, flags); |
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mutex_unlock(&shost->scan_mutex); |
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return; |
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} |
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spin_unlock_irqrestore(shost->host_lock, flags); |
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scsi_autopm_get_host(shost); |
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flush_workqueue(shost->tmf_work_q); |
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scsi_forget_host(shost); |
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mutex_unlock(&shost->scan_mutex); |
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scsi_proc_host_rm(shost); |
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spin_lock_irqsave(shost->host_lock, flags); |
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if (scsi_host_set_state(shost, SHOST_DEL)) |
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BUG_ON(scsi_host_set_state(shost, SHOST_DEL_RECOVERY)); |
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spin_unlock_irqrestore(shost->host_lock, flags); |
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transport_unregister_device(&shost->shost_gendev); |
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device_unregister(&shost->shost_dev); |
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device_del(&shost->shost_gendev); |
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} |
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EXPORT_SYMBOL(scsi_remove_host); |
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|
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/** |
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* scsi_add_host_with_dma - add a scsi host with dma device |
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* @shost: scsi host pointer to add |
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* @dev: a struct device of type scsi class |
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* @dma_dev: dma device for the host |
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* |
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* Note: You rarely need to worry about this unless you're in a |
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* virtualised host environments, so use the simpler scsi_add_host() |
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* function instead. |
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* |
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* Return value: |
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* 0 on success / != 0 for error |
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**/ |
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int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev, |
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struct device *dma_dev) |
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{ |
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struct scsi_host_template *sht = shost->hostt; |
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int error = -EINVAL; |
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shost_printk(KERN_INFO, shost, "%s\n", |
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sht->info ? sht->info(shost) : sht->name); |
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if (!shost->can_queue) { |
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shost_printk(KERN_ERR, shost, |
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"can_queue = 0 no longer supported\n"); |
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goto fail; |
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} |
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error = scsi_init_sense_cache(shost); |
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if (error) |
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goto fail; |
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error = scsi_mq_setup_tags(shost); |
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if (error) |
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goto fail; |
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if (!shost->shost_gendev.parent) |
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shost->shost_gendev.parent = dev ? dev : &platform_bus; |
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if (!dma_dev) |
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dma_dev = shost->shost_gendev.parent; |
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shost->dma_dev = dma_dev; |
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/* |
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* Increase usage count temporarily here so that calling |
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* scsi_autopm_put_host() will trigger runtime idle if there is |
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* nothing else preventing suspending the device. |
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*/ |
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pm_runtime_get_noresume(&shost->shost_gendev); |
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pm_runtime_set_active(&shost->shost_gendev); |
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pm_runtime_enable(&shost->shost_gendev); |
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device_enable_async_suspend(&shost->shost_gendev); |
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error = device_add(&shost->shost_gendev); |
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if (error) |
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goto out_disable_runtime_pm; |
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scsi_host_set_state(shost, SHOST_RUNNING); |
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get_device(shost->shost_gendev.parent); |
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device_enable_async_suspend(&shost->shost_dev); |
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error = device_add(&shost->shost_dev); |
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if (error) |
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goto out_del_gendev; |
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get_device(&shost->shost_gendev); |
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if (shost->transportt->host_size) { |
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shost->shost_data = kzalloc(shost->transportt->host_size, |
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GFP_KERNEL); |
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if (shost->shost_data == NULL) { |
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error = -ENOMEM; |
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goto out_del_dev; |
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} |
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} |
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if (shost->transportt->create_work_queue) { |
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snprintf(shost->work_q_name, sizeof(shost->work_q_name), |
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"scsi_wq_%d", shost->host_no); |
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shost->work_q = alloc_workqueue("%s", |
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WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND, |
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1, shost->work_q_name); |
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if (!shost->work_q) { |
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error = -EINVAL; |
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goto out_free_shost_data; |
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} |
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} |
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error = scsi_sysfs_add_host(shost); |
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if (error) |
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goto out_destroy_host; |
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scsi_proc_host_add(shost); |
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scsi_autopm_put_host(shost); |
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return error; |
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out_destroy_host: |
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if (shost->work_q) |
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destroy_workqueue(shost->work_q); |
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out_free_shost_data: |
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kfree(shost->shost_data); |
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out_del_dev: |
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device_del(&shost->shost_dev); |
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out_del_gendev: |
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device_del(&shost->shost_gendev); |
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out_disable_runtime_pm: |
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device_disable_async_suspend(&shost->shost_gendev); |
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pm_runtime_disable(&shost->shost_gendev); |
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pm_runtime_set_suspended(&shost->shost_gendev); |
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pm_runtime_put_noidle(&shost->shost_gendev); |
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scsi_mq_destroy_tags(shost); |
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fail: |
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return error; |
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} |
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EXPORT_SYMBOL(scsi_add_host_with_dma); |
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static void scsi_host_dev_release(struct device *dev) |
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{ |
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struct Scsi_Host *shost = dev_to_shost(dev); |
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struct device *parent = dev->parent; |
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scsi_proc_hostdir_rm(shost->hostt); |
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/* Wait for functions invoked through call_rcu(&shost->rcu, ...) */ |
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rcu_barrier(); |
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if (shost->tmf_work_q) |
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destroy_workqueue(shost->tmf_work_q); |
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if (shost->ehandler) |
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kthread_stop(shost->ehandler); |
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if (shost->work_q) |
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destroy_workqueue(shost->work_q); |
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if (shost->shost_state == SHOST_CREATED) { |
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/* |
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* Free the shost_dev device name here if scsi_host_alloc() |
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* and scsi_host_put() have been called but neither |
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* scsi_host_add() nor scsi_host_remove() has been called. |
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* This avoids that the memory allocated for the shost_dev |
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* name is leaked. |
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*/ |
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kfree(dev_name(&shost->shost_dev)); |
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} |
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if (shost->tag_set.tags) |
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scsi_mq_destroy_tags(shost); |
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kfree(shost->shost_data); |
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ida_simple_remove(&host_index_ida, shost->host_no); |
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if (parent) |
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put_device(parent); |
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kfree(shost); |
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} |
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static struct device_type scsi_host_type = { |
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.name = "scsi_host", |
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.release = scsi_host_dev_release, |
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}; |
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/** |
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* scsi_host_alloc - register a scsi host adapter instance. |
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* @sht: pointer to scsi host template |
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* @privsize: extra bytes to allocate for driver |
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* |
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* Note: |
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* Allocate a new Scsi_Host and perform basic initialization. |
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* The host is not published to the scsi midlayer until scsi_add_host |
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* is called. |
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* |
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* Return value: |
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* Pointer to a new Scsi_Host |
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**/ |
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struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize) |
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{ |
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struct Scsi_Host *shost; |
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gfp_t gfp_mask = GFP_KERNEL; |
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int index; |
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if (sht->unchecked_isa_dma && privsize) |
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gfp_mask |= __GFP_DMA; |
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shost = kzalloc(sizeof(struct Scsi_Host) + privsize, gfp_mask); |
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if (!shost) |
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return NULL; |
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shost->host_lock = &shost->default_lock; |
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spin_lock_init(shost->host_lock); |
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shost->shost_state = SHOST_CREATED; |
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INIT_LIST_HEAD(&shost->__devices); |
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INIT_LIST_HEAD(&shost->__targets); |
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INIT_LIST_HEAD(&shost->eh_cmd_q); |
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INIT_LIST_HEAD(&shost->starved_list); |
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init_waitqueue_head(&shost->host_wait); |
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mutex_init(&shost->scan_mutex); |
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index = ida_simple_get(&host_index_ida, 0, 0, GFP_KERNEL); |
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if (index < 0) |
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goto fail_kfree; |
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shost->host_no = index; |
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shost->dma_channel = 0xff; |
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/* These three are default values which can be overridden */ |
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shost->max_channel = 0; |
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shost->max_id = 8; |
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shost->max_lun = 8; |
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|
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/* Give each shost a default transportt */ |
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shost->transportt = &blank_transport_template; |
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/* |
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* All drivers right now should be able to handle 12 byte |
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* commands. Every so often there are requests for 16 byte |
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* commands, but individual low-level drivers need to certify that |
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* they actually do something sensible with such commands. |
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*/ |
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shost->max_cmd_len = 12; |
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shost->hostt = sht; |
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shost->this_id = sht->this_id; |
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shost->can_queue = sht->can_queue; |
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shost->sg_tablesize = sht->sg_tablesize; |
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shost->sg_prot_tablesize = sht->sg_prot_tablesize; |
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shost->cmd_per_lun = sht->cmd_per_lun; |
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shost->unchecked_isa_dma = sht->unchecked_isa_dma; |
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shost->no_write_same = sht->no_write_same; |
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shost->host_tagset = sht->host_tagset; |
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if (shost_eh_deadline == -1 || !sht->eh_host_reset_handler) |
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shost->eh_deadline = -1; |
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else if ((ulong) shost_eh_deadline * HZ > INT_MAX) { |
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shost_printk(KERN_WARNING, shost, |
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"eh_deadline %u too large, setting to %u\n", |
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shost_eh_deadline, INT_MAX / HZ); |
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shost->eh_deadline = INT_MAX; |
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} else |
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shost->eh_deadline = shost_eh_deadline * HZ; |
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if (sht->supported_mode == MODE_UNKNOWN) |
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/* means we didn't set it ... default to INITIATOR */ |
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shost->active_mode = MODE_INITIATOR; |
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else |
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shost->active_mode = sht->supported_mode; |
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if (sht->max_host_blocked) |
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shost->max_host_blocked = sht->max_host_blocked; |
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else |
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shost->max_host_blocked = SCSI_DEFAULT_HOST_BLOCKED; |
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|
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/* |
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* If the driver imposes no hard sector transfer limit, start at |
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* machine infinity initially. |
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*/ |
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if (sht->max_sectors) |
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shost->max_sectors = sht->max_sectors; |
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else |
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shost->max_sectors = SCSI_DEFAULT_MAX_SECTORS; |
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|
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if (sht->max_segment_size) |
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shost->max_segment_size = sht->max_segment_size; |
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else |
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shost->max_segment_size = BLK_MAX_SEGMENT_SIZE; |
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|
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/* |
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* assume a 4GB boundary, if not set |
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*/ |
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if (sht->dma_boundary) |
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shost->dma_boundary = sht->dma_boundary; |
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else |
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shost->dma_boundary = 0xffffffff; |
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|
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if (sht->virt_boundary_mask) |
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shost->virt_boundary_mask = sht->virt_boundary_mask; |
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|
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device_initialize(&shost->shost_gendev); |
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dev_set_name(&shost->shost_gendev, "host%d", shost->host_no); |
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shost->shost_gendev.bus = &scsi_bus_type; |
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shost->shost_gendev.type = &scsi_host_type; |
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|
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device_initialize(&shost->shost_dev); |
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shost->shost_dev.parent = &shost->shost_gendev; |
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shost->shost_dev.class = &shost_class; |
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dev_set_name(&shost->shost_dev, "host%d", shost->host_no); |
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shost->shost_dev.groups = scsi_sysfs_shost_attr_groups; |
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|
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shost->ehandler = kthread_run(scsi_error_handler, shost, |
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"scsi_eh_%d", shost->host_no); |
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if (IS_ERR(shost->ehandler)) { |
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shost_printk(KERN_WARNING, shost, |
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"error handler thread failed to spawn, error = %ld\n", |
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PTR_ERR(shost->ehandler)); |
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goto fail_index_remove; |
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} |
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|
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shost->tmf_work_q = alloc_workqueue("scsi_tmf_%d", |
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WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, |
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1, shost->host_no); |
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if (!shost->tmf_work_q) { |
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shost_printk(KERN_WARNING, shost, |
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"failed to create tmf workq\n"); |
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goto fail_kthread; |
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} |
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scsi_proc_hostdir_add(shost->hostt); |
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return shost; |
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|
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fail_kthread: |
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kthread_stop(shost->ehandler); |
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fail_index_remove: |
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ida_simple_remove(&host_index_ida, shost->host_no); |
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fail_kfree: |
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kfree(shost); |
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return NULL; |
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} |
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EXPORT_SYMBOL(scsi_host_alloc); |
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|
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static int __scsi_host_match(struct device *dev, const void *data) |
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{ |
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struct Scsi_Host *p; |
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const unsigned short *hostnum = data; |
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|
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p = class_to_shost(dev); |
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return p->host_no == *hostnum; |
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} |
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|
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/** |
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* scsi_host_lookup - get a reference to a Scsi_Host by host no |
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* @hostnum: host number to locate |
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* |
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* Return value: |
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* A pointer to located Scsi_Host or NULL. |
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* |
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* The caller must do a scsi_host_put() to drop the reference |
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* that scsi_host_get() took. The put_device() below dropped |
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* the reference from class_find_device(). |
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**/ |
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struct Scsi_Host *scsi_host_lookup(unsigned short hostnum) |
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{ |
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struct device *cdev; |
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struct Scsi_Host *shost = NULL; |
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|
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cdev = class_find_device(&shost_class, NULL, &hostnum, |
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__scsi_host_match); |
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if (cdev) { |
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shost = scsi_host_get(class_to_shost(cdev)); |
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put_device(cdev); |
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} |
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return shost; |
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} |
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EXPORT_SYMBOL(scsi_host_lookup); |
|
|
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/** |
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* scsi_host_get - inc a Scsi_Host ref count |
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* @shost: Pointer to Scsi_Host to inc. |
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**/ |
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struct Scsi_Host *scsi_host_get(struct Scsi_Host *shost) |
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{ |
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if ((shost->shost_state == SHOST_DEL) || |
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!get_device(&shost->shost_gendev)) |
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return NULL; |
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return shost; |
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} |
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EXPORT_SYMBOL(scsi_host_get); |
|
|
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static bool scsi_host_check_in_flight(struct request *rq, void *data, |
|
bool reserved) |
|
{ |
|
int *count = data; |
|
struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq); |
|
|
|
if (test_bit(SCMD_STATE_INFLIGHT, &cmd->state)) |
|
(*count)++; |
|
|
|
return true; |
|
} |
|
|
|
/** |
|
* scsi_host_busy - Return the host busy counter |
|
* @shost: Pointer to Scsi_Host to inc. |
|
**/ |
|
int scsi_host_busy(struct Scsi_Host *shost) |
|
{ |
|
int cnt = 0; |
|
|
|
blk_mq_tagset_busy_iter(&shost->tag_set, |
|
scsi_host_check_in_flight, &cnt); |
|
return cnt; |
|
} |
|
EXPORT_SYMBOL(scsi_host_busy); |
|
|
|
/** |
|
* scsi_host_put - dec a Scsi_Host ref count |
|
* @shost: Pointer to Scsi_Host to dec. |
|
**/ |
|
void scsi_host_put(struct Scsi_Host *shost) |
|
{ |
|
put_device(&shost->shost_gendev); |
|
} |
|
EXPORT_SYMBOL(scsi_host_put); |
|
|
|
int scsi_init_hosts(void) |
|
{ |
|
return class_register(&shost_class); |
|
} |
|
|
|
void scsi_exit_hosts(void) |
|
{ |
|
class_unregister(&shost_class); |
|
ida_destroy(&host_index_ida); |
|
} |
|
|
|
int scsi_is_host_device(const struct device *dev) |
|
{ |
|
return dev->type == &scsi_host_type; |
|
} |
|
EXPORT_SYMBOL(scsi_is_host_device); |
|
|
|
/** |
|
* 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) |
|
{ |
|
if (unlikely(!shost->work_q)) { |
|
shost_printk(KERN_ERR, shost, |
|
"ERROR: Scsi host '%s' attempted to queue scsi-work, " |
|
"when no workqueue created.\n", shost->hostt->name); |
|
dump_stack(); |
|
|
|
return -EINVAL; |
|
} |
|
|
|
return queue_work(shost->work_q, work); |
|
} |
|
EXPORT_SYMBOL_GPL(scsi_queue_work); |
|
|
|
/** |
|
* scsi_flush_work - Flush a Scsi_Host's workqueue. |
|
* @shost: Pointer to Scsi_Host. |
|
**/ |
|
void scsi_flush_work(struct Scsi_Host *shost) |
|
{ |
|
if (!shost->work_q) { |
|
shost_printk(KERN_ERR, shost, |
|
"ERROR: Scsi host '%s' attempted to flush scsi-work, " |
|
"when no workqueue created.\n", shost->hostt->name); |
|
dump_stack(); |
|
return; |
|
} |
|
|
|
flush_workqueue(shost->work_q); |
|
} |
|
EXPORT_SYMBOL_GPL(scsi_flush_work); |
|
|
|
static bool complete_all_cmds_iter(struct request *rq, void *data, bool rsvd) |
|
{ |
|
struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(rq); |
|
int status = *(int *)data; |
|
|
|
scsi_dma_unmap(scmd); |
|
scmd->result = status << 16; |
|
scmd->scsi_done(scmd); |
|
return true; |
|
} |
|
|
|
/** |
|
* 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, int status) |
|
{ |
|
blk_mq_tagset_busy_iter(&shost->tag_set, complete_all_cmds_iter, |
|
&status); |
|
} |
|
EXPORT_SYMBOL_GPL(scsi_host_complete_all_commands); |
|
|
|
struct scsi_host_busy_iter_data { |
|
bool (*fn)(struct scsi_cmnd *, void *, bool); |
|
void *priv; |
|
}; |
|
|
|
static bool __scsi_host_busy_iter_fn(struct request *req, void *priv, |
|
bool reserved) |
|
{ |
|
struct scsi_host_busy_iter_data *iter_data = priv; |
|
struct scsi_cmnd *sc = blk_mq_rq_to_pdu(req); |
|
|
|
return iter_data->fn(sc, iter_data->priv, reserved); |
|
} |
|
|
|
/** |
|
* 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 *, bool), |
|
void *priv) |
|
{ |
|
struct scsi_host_busy_iter_data iter_data = { |
|
.fn = fn, |
|
.priv = priv, |
|
}; |
|
|
|
blk_mq_tagset_busy_iter(&shost->tag_set, __scsi_host_busy_iter_fn, |
|
&iter_data); |
|
} |
|
EXPORT_SYMBOL_GPL(scsi_host_busy_iter);
|
|
|