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658 lines
16 KiB
C
658 lines
16 KiB
C
/*
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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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* <drew@colorado.edu>
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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 <tmm@image.dk>
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*
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* Restructured scsi_host lists and associated functions.
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* September 04, 2002 Mike Anderson (andmike@us.ibm.com)
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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 <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_priv.h"
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#include "scsi_logging.h"
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static atomic_t scsi_host_next_hn = ATOMIC_INIT(0); /* host_no for next new host */
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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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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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* 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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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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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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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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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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EXPORT_SYMBOL(scsi_host_set_state);
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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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* 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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if (shost_use_blk_mq(shost)) {
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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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} else {
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shost->bqt = blk_init_tags(shost->can_queue,
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shost->hostt->tag_alloc_policy);
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if (!shost->bqt) {
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error = -ENOMEM;
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goto fail;
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}
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}
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/*
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* Note that we allocate the freelist even for the MQ case for now,
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* as we need a command set aside for scsi_reset_provider. Having
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* the full host freelist and one command available for that is a
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* little heavy-handed, but avoids introducing a special allocator
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* just for this. Eventually the structure of scsi_reset_provider
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* will need a major overhaul.
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*/
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error = scsi_setup_command_freelist(shost);
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if (error)
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goto out_destroy_tags;
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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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error = device_add(&shost->shost_gendev);
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if (error)
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goto out_destroy_freelist;
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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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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 = create_singlethread_workqueue(
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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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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_destroy_freelist:
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scsi_destroy_command_freelist(shost);
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out_destroy_tags:
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if (shost_use_blk_mq(shost))
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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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struct request_queue *q;
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void *queuedata;
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scsi_proc_hostdir_rm(shost->hostt);
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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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q = shost->uspace_req_q;
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if (q) {
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queuedata = q->queuedata;
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blk_cleanup_queue(q);
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kfree(queuedata);
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}
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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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scsi_destroy_command_freelist(shost);
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if (shost_use_blk_mq(shost)) {
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if (shost->tag_set.tags)
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scsi_mq_destroy_tags(shost);
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} else {
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if (shost->bqt)
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blk_free_tags(shost->bqt);
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}
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kfree(shost->shost_data);
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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 int shost_eh_deadline = -1;
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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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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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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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/*
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* subtract one because we increment first then return, but we need to
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* know what the next host number was before increment
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*/
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shost->host_no = atomic_inc_return(&scsi_host_next_hn) - 1;
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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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/* 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->use_clustering = sht->use_clustering;
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shost->no_write_same = sht->no_write_same;
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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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* 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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* 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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shost->use_blk_mq = scsi_use_blk_mq && !shost->hostt->disable_blk_mq;
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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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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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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_kfree;
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}
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|
shost->tmf_work_q = alloc_workqueue("scsi_tmf_%d",
|
|
WQ_UNBOUND | WQ_MEM_RECLAIM,
|
|
1, shost->host_no);
|
|
if (!shost->tmf_work_q) {
|
|
shost_printk(KERN_WARNING, shost,
|
|
"failed to create tmf workq\n");
|
|
goto fail_kthread;
|
|
}
|
|
scsi_proc_hostdir_add(shost->hostt);
|
|
return shost;
|
|
|
|
fail_kthread:
|
|
kthread_stop(shost->ehandler);
|
|
fail_kfree:
|
|
kfree(shost);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(scsi_host_alloc);
|
|
|
|
struct Scsi_Host *scsi_register(struct scsi_host_template *sht, int privsize)
|
|
{
|
|
struct Scsi_Host *shost = scsi_host_alloc(sht, privsize);
|
|
|
|
if (!sht->detect) {
|
|
printk(KERN_WARNING "scsi_register() called on new-style "
|
|
"template for driver %s\n", sht->name);
|
|
dump_stack();
|
|
}
|
|
|
|
if (shost)
|
|
list_add_tail(&shost->sht_legacy_list, &sht->legacy_hosts);
|
|
return shost;
|
|
}
|
|
EXPORT_SYMBOL(scsi_register);
|
|
|
|
void scsi_unregister(struct Scsi_Host *shost)
|
|
{
|
|
list_del(&shost->sht_legacy_list);
|
|
scsi_host_put(shost);
|
|
}
|
|
EXPORT_SYMBOL(scsi_unregister);
|
|
|
|
static int __scsi_host_match(struct device *dev, const void *data)
|
|
{
|
|
struct Scsi_Host *p;
|
|
const unsigned short *hostnum = data;
|
|
|
|
p = class_to_shost(dev);
|
|
return p->host_no == *hostnum;
|
|
}
|
|
|
|
/**
|
|
* scsi_host_lookup - get a reference to a Scsi_Host by host no
|
|
* @hostnum: host number to locate
|
|
*
|
|
* Return value:
|
|
* A pointer to located Scsi_Host or NULL.
|
|
*
|
|
* The caller must do a scsi_host_put() to drop the reference
|
|
* that scsi_host_get() took. The put_device() below dropped
|
|
* the reference from class_find_device().
|
|
**/
|
|
struct Scsi_Host *scsi_host_lookup(unsigned short hostnum)
|
|
{
|
|
struct device *cdev;
|
|
struct Scsi_Host *shost = NULL;
|
|
|
|
cdev = class_find_device(&shost_class, NULL, &hostnum,
|
|
__scsi_host_match);
|
|
if (cdev) {
|
|
shost = scsi_host_get(class_to_shost(cdev));
|
|
put_device(cdev);
|
|
}
|
|
return shost;
|
|
}
|
|
EXPORT_SYMBOL(scsi_host_lookup);
|
|
|
|
/**
|
|
* scsi_host_get - inc a Scsi_Host ref count
|
|
* @shost: Pointer to Scsi_Host to inc.
|
|
**/
|
|
struct Scsi_Host *scsi_host_get(struct Scsi_Host *shost)
|
|
{
|
|
if ((shost->shost_state == SHOST_DEL) ||
|
|
!get_device(&shost->shost_gendev))
|
|
return NULL;
|
|
return shost;
|
|
}
|
|
EXPORT_SYMBOL(scsi_host_get);
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
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);
|