/* virthba.c * * Copyright (C) 2010 - 2013 UNISYS CORPORATION * All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for more * details. */ #define EXPORT_SYMTAB /* if you want to turn on some debugging of write device data or read * device data, define these two undefs. You will probably want to * customize the code which is here since it was written assuming * reading and writing a specific data file df.64M.txt which is a * 64Megabyte file created by Art Nilson using a scritp I wrote called * cr_test_data.pl. The data file consists of 256 byte lines of text * which start with an 8 digit sequence number, a colon, and then * letters after that */ #include #ifdef CONFIG_MODVERSIONS #include #endif #include "diagnostics/appos_subsystems.h" #include "uisutils.h" #include "uisqueue.h" #include "uisthread.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include "virthba.h" #include "virtpci.h" #include "visorchipset.h" #include "version.h" #include "guestlinuxdebug.h" /* this is shorter than using __FILE__ (full path name) in * debug/info/error messages */ #define CURRENT_FILE_PC VIRT_HBA_PC_virthba_c #define __MYFILE__ "virthba.c" /* NOTE: L1_CACHE_BYTES >=128 */ #define DEVICE_ATTRIBUTE struct device_attribute /* MAX_BUF = 6 lines x 10 MAXVHBA x 80 characters * = 4800 bytes ~ 2^13 = 8192 bytes */ #define MAX_BUF 8192 /*****************************************************/ /* Forward declarations */ /*****************************************************/ static int virthba_probe(struct virtpci_dev *dev, const struct pci_device_id *id); static void virthba_remove(struct virtpci_dev *dev); static int virthba_abort_handler(struct scsi_cmnd *scsicmd); static int virthba_bus_reset_handler(struct scsi_cmnd *scsicmd); static int virthba_device_reset_handler(struct scsi_cmnd *scsicmd); static int virthba_host_reset_handler(struct scsi_cmnd *scsicmd); static const char *virthba_get_info(struct Scsi_Host *shp); static int virthba_ioctl(struct scsi_device *dev, int cmd, void __user *arg); static int virthba_queue_command_lck(struct scsi_cmnd *scsicmd, void (*virthba_cmnd_done) (struct scsi_cmnd *)); static const struct x86_cpu_id unisys_spar_ids[] = { { X86_VENDOR_INTEL, 6, 62, X86_FEATURE_ANY }, {} }; /* Autoload */ MODULE_DEVICE_TABLE(x86cpu, unisys_spar_ids); #ifdef DEF_SCSI_QCMD static DEF_SCSI_QCMD(virthba_queue_command) #else #define virthba_queue_command virthba_queue_command_lck #endif static int virthba_slave_alloc(struct scsi_device *scsidev); static int virthba_slave_configure(struct scsi_device *scsidev); static void virthba_slave_destroy(struct scsi_device *scsidev); static int process_incoming_rsps(void *); static int virthba_serverup(struct virtpci_dev *virtpcidev); static int virthba_serverdown(struct virtpci_dev *virtpcidev, u32 state); static void do_disk_add_remove(struct work_struct *work); static void virthba_serverdown_complete(struct work_struct *work); static ssize_t info_debugfs_read(struct file *file, char __user *buf, size_t len, loff_t *offset); static ssize_t enable_ints_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos); /*****************************************************/ /* Globals */ /*****************************************************/ static int rsltq_wait_usecs = 4000; /* Default 4ms */ static unsigned int max_buff_len; /* Module options */ static char *virthba_options = "NONE"; static const struct pci_device_id virthba_id_table[] = { {PCI_DEVICE(PCI_VENDOR_ID_UNISYS, PCI_DEVICE_ID_VIRTHBA)}, {0}, }; /* export virthba_id_table */ MODULE_DEVICE_TABLE(pci, virthba_id_table); static struct workqueue_struct *virthba_serverdown_workqueue; static struct virtpci_driver virthba_driver = { .name = "uisvirthba", .version = VERSION, .vertag = NULL, .id_table = virthba_id_table, .probe = virthba_probe, .remove = virthba_remove, .resume = virthba_serverup, .suspend = virthba_serverdown }; /* The Send and Recive Buffers of the IO Queue may both be full */ #define MAX_PENDING_REQUESTS (MIN_NUMSIGNALS*2) #define INTERRUPT_VECTOR_MASK 0x3F struct scsipending { char cmdtype; /* Type of pointer that is being stored */ void *sent; /* The Data being tracked */ /* struct scsi_cmnd *type for virthba_queue_command */ /* struct uiscmdrsp *type for management commands */ }; #define VIRTHBA_ERROR_COUNT 30 #define IOS_ERROR_THRESHOLD 1000 struct virtdisk_info { u32 valid; u32 channel, id, lun; /* Disk Path */ atomic_t ios_threshold; atomic_t error_count; struct virtdisk_info *next; }; /* Each Scsi_Host has a host_data area that contains this struct. */ struct virthba_info { struct Scsi_Host *scsihost; struct virtpci_dev *virtpcidev; struct list_head dev_info_list; struct chaninfo chinfo; struct irq_info intr; /* use recvInterrupt info to receive interrupts when IOs complete */ int interrupt_vector; struct scsipending pending[MAX_PENDING_REQUESTS]; /* Tracks the requests that have been */ /* forwarded to the IOVM and haven't returned yet */ unsigned int nextinsert; /* Start search for next pending free slot here */ spinlock_t privlock; bool serverdown; bool serverchangingstate; unsigned long long acquire_failed_cnt; unsigned long long interrupts_rcvd; unsigned long long interrupts_notme; unsigned long long interrupts_disabled; struct work_struct serverdown_completion; u64 __iomem *flags_addr; atomic_t interrupt_rcvd; wait_queue_head_t rsp_queue; struct virtdisk_info head; }; /* Work Data for dar_work_queue */ struct diskaddremove { u8 add; /* 0-remove, 1-add */ struct Scsi_Host *shost; /* Scsi Host for this virthba instance */ u32 channel, id, lun; /* Disk Path */ struct diskaddremove *next; }; #define virtpci_dev_to_virthba_virthba_get_info(d) \ container_of(d, struct virthba_info, virtpcidev) static DEVICE_ATTRIBUTE *virthba_shost_attrs[]; static struct scsi_host_template virthba_driver_template = { .name = "Unisys Virtual HBA", .info = virthba_get_info, .ioctl = virthba_ioctl, .queuecommand = virthba_queue_command, .eh_abort_handler = virthba_abort_handler, .eh_device_reset_handler = virthba_device_reset_handler, .eh_bus_reset_handler = virthba_bus_reset_handler, .eh_host_reset_handler = virthba_host_reset_handler, .shost_attrs = virthba_shost_attrs, #define VIRTHBA_MAX_CMNDS 128 .can_queue = VIRTHBA_MAX_CMNDS, .sg_tablesize = 64, /* largest number of address/length pairs */ .this_id = -1, .slave_alloc = virthba_slave_alloc, .slave_configure = virthba_slave_configure, .slave_destroy = virthba_slave_destroy, .use_clustering = ENABLE_CLUSTERING, }; struct virthba_devices_open { struct virthba_info *virthbainfo; }; static const struct file_operations debugfs_info_fops = { .read = info_debugfs_read, }; static const struct file_operations debugfs_enable_ints_fops = { .write = enable_ints_write, }; /*****************************************************/ /* Structs */ /*****************************************************/ #define VIRTHBASOPENMAX 1 /* array of open devices maintained by open() and close(); */ static struct virthba_devices_open virthbas_open[VIRTHBASOPENMAX]; static struct dentry *virthba_debugfs_dir; /*****************************************************/ /* Local Functions */ /*****************************************************/ static int add_scsipending_entry(struct virthba_info *vhbainfo, char cmdtype, void *new) { unsigned long flags; int insert_location; spin_lock_irqsave(&vhbainfo->privlock, flags); insert_location = vhbainfo->nextinsert; while (vhbainfo->pending[insert_location].sent) { insert_location = (insert_location + 1) % MAX_PENDING_REQUESTS; if (insert_location == (int)vhbainfo->nextinsert) { spin_unlock_irqrestore(&vhbainfo->privlock, flags); return -1; } } vhbainfo->pending[insert_location].cmdtype = cmdtype; vhbainfo->pending[insert_location].sent = new; vhbainfo->nextinsert = (insert_location + 1) % MAX_PENDING_REQUESTS; spin_unlock_irqrestore(&vhbainfo->privlock, flags); return insert_location; } static unsigned int add_scsipending_entry_with_wait(struct virthba_info *vhbainfo, char cmdtype, void *new) { int insert_location = add_scsipending_entry(vhbainfo, cmdtype, new); while (insert_location == -1) { set_current_state(TASK_INTERRUPTIBLE); schedule_timeout(msecs_to_jiffies(10)); insert_location = add_scsipending_entry(vhbainfo, cmdtype, new); } return (unsigned int)insert_location; } static void * del_scsipending_entry(struct virthba_info *vhbainfo, uintptr_t del) { unsigned long flags; void *sent = NULL; if (del < MAX_PENDING_REQUESTS) { spin_lock_irqsave(&vhbainfo->privlock, flags); sent = vhbainfo->pending[del].sent; vhbainfo->pending[del].cmdtype = 0; vhbainfo->pending[del].sent = NULL; spin_unlock_irqrestore(&vhbainfo->privlock, flags); } return sent; } /* dar_work_queue (Disk Add/Remove) */ static struct work_struct dar_work_queue; static struct diskaddremove *dar_work_queue_head; static spinlock_t dar_work_queue_lock; static unsigned short dar_work_queue_sched; #define QUEUE_DISKADDREMOVE(dar) { \ spin_lock_irqsave(&dar_work_queue_lock, flags); \ if (!dar_work_queue_head) { \ dar_work_queue_head = dar; \ dar->next = NULL; \ } \ else { \ dar->next = dar_work_queue_head; \ dar_work_queue_head = dar; \ } \ if (!dar_work_queue_sched) { \ schedule_work(&dar_work_queue); \ dar_work_queue_sched = 1; \ } \ spin_unlock_irqrestore(&dar_work_queue_lock, flags); \ } static inline void send_disk_add_remove(struct diskaddremove *dar) { struct scsi_device *sdev; int error; sdev = scsi_device_lookup(dar->shost, dar->channel, dar->id, dar->lun); if (sdev) { if (!(dar->add)) scsi_remove_device(sdev); } else if (dar->add) { error = scsi_add_device(dar->shost, dar->channel, dar->id, dar->lun); } kfree(dar); } /*****************************************************/ /* dar_work_queue Handler Thread */ /*****************************************************/ static void do_disk_add_remove(struct work_struct *work) { struct diskaddremove *dar; struct diskaddremove *tmphead; int i = 0; unsigned long flags; spin_lock_irqsave(&dar_work_queue_lock, flags); tmphead = dar_work_queue_head; dar_work_queue_head = NULL; dar_work_queue_sched = 0; spin_unlock_irqrestore(&dar_work_queue_lock, flags); while (tmphead) { dar = tmphead; tmphead = dar->next; send_disk_add_remove(dar); i++; } } /*****************************************************/ /* Routine to add entry to dar_work_queue */ /*****************************************************/ static void process_disk_notify(struct Scsi_Host *shost, struct uiscmdrsp *cmdrsp) { struct diskaddremove *dar; unsigned long flags; dar = kzalloc(sizeof(*dar), GFP_ATOMIC); if (dar) { dar->add = cmdrsp->disknotify.add; dar->shost = shost; dar->channel = cmdrsp->disknotify.channel; dar->id = cmdrsp->disknotify.id; dar->lun = cmdrsp->disknotify.lun; QUEUE_DISKADDREMOVE(dar); } } /*****************************************************/ /* Probe Remove Functions */ /*****************************************************/ static irqreturn_t virthba_isr(int irq, void *dev_id) { struct virthba_info *virthbainfo = (struct virthba_info *)dev_id; struct channel_header __iomem *channel_header; struct signal_queue_header __iomem *pqhdr; u64 mask; unsigned long long rc1; if (!virthbainfo) return IRQ_NONE; virthbainfo->interrupts_rcvd++; channel_header = virthbainfo->chinfo.queueinfo->chan; if (((readq(&channel_header->features) & ULTRA_IO_IOVM_IS_OK_WITH_DRIVER_DISABLING_INTS) != 0) && ((readq(&channel_header->features) & ULTRA_IO_DRIVER_DISABLES_INTS) != 0)) { virthbainfo->interrupts_disabled++; mask = ~ULTRA_CHANNEL_ENABLE_INTS; rc1 = uisqueue_interlocked_and(virthbainfo->flags_addr, mask); } if (spar_signalqueue_empty(channel_header, IOCHAN_FROM_IOPART)) { virthbainfo->interrupts_notme++; return IRQ_NONE; } pqhdr = (struct signal_queue_header __iomem *) ((char __iomem *)channel_header + readq(&channel_header->ch_space_offset)) + IOCHAN_FROM_IOPART; writeq(readq(&pqhdr->num_irq_received) + 1, &pqhdr->num_irq_received); atomic_set(&virthbainfo->interrupt_rcvd, 1); wake_up_interruptible(&virthbainfo->rsp_queue); return IRQ_HANDLED; } static int virthba_probe(struct virtpci_dev *virtpcidev, const struct pci_device_id *id) { int error; struct Scsi_Host *scsihost; struct virthba_info *virthbainfo; int rsp; int i; irq_handler_t handler = virthba_isr; struct channel_header __iomem *channel_header; struct signal_queue_header __iomem *pqhdr; u64 mask; POSTCODE_LINUX_2(VHBA_PROBE_ENTRY_PC, POSTCODE_SEVERITY_INFO); /* call scsi_host_alloc to register a scsi host adapter * instance - this virthba that has just been created is an * instance of a scsi host adapter. This scsi_host_alloc * function allocates a new Scsi_Host struct & performs basic * initialization. The host is not published to the scsi * midlayer until scsi_add_host is called. */ /* arg 2 passed in length of extra space we want allocated * with scsi_host struct for our own use scsi_host_alloc * assign host_no */ scsihost = scsi_host_alloc(&virthba_driver_template, sizeof(struct virthba_info)); if (!scsihost) return -ENODEV; scsihost->this_id = UIS_MAGIC_VHBA; /* linux treats max-channel differently than max-id & max-lun. * In the latter cases, those two values result in 0 to max-1 * (inclusive) being scanned. But in the case of channels, the * scan is 0 to max (inclusive); so we will subtract one from * the max-channel value. */ scsihost->max_channel = (unsigned)virtpcidev->scsi.max.max_channel; scsihost->max_id = (unsigned)virtpcidev->scsi.max.max_id; scsihost->max_lun = (unsigned)virtpcidev->scsi.max.max_lun; scsihost->cmd_per_lun = (unsigned)virtpcidev->scsi.max.cmd_per_lun; scsihost->max_sectors = (unsigned short)(virtpcidev->scsi.max.max_io_size >> 9); scsihost->sg_tablesize = (unsigned short)(virtpcidev->scsi.max.max_io_size / PAGE_SIZE); if (scsihost->sg_tablesize > MAX_PHYS_INFO) scsihost->sg_tablesize = MAX_PHYS_INFO; /* this creates "host%d" in sysfs. If 2nd argument is NULL, * then this generic /sys/devices/platform/host? device is * created and /sys/scsi_host/host? -> * /sys/devices/platform/host? If 2nd argument is not NULL, * then this generic /sys/devices//host? is created and * host? points to that device instead. */ error = scsi_add_host(scsihost, &virtpcidev->generic_dev); if (error) { POSTCODE_LINUX_2(VHBA_PROBE_FAILURE_PC, POSTCODE_SEVERITY_ERR); /* decr refcount on scsihost which was incremented by * scsi_add_host so the scsi_host gets deleted */ scsi_host_put(scsihost); return -ENODEV; } virthbainfo = (struct virthba_info *)scsihost->hostdata; memset(virthbainfo, 0, sizeof(struct virthba_info)); for (i = 0; i < VIRTHBASOPENMAX; i++) { if (!virthbas_open[i].virthbainfo) { virthbas_open[i].virthbainfo = virthbainfo; break; } } virthbainfo->interrupt_vector = -1; virthbainfo->chinfo.queueinfo = &virtpcidev->queueinfo; virthbainfo->virtpcidev = virtpcidev; spin_lock_init(&virthbainfo->chinfo.insertlock); init_waitqueue_head(&virthbainfo->rsp_queue); spin_lock_init(&virthbainfo->privlock); memset(&virthbainfo->pending, 0, sizeof(virthbainfo->pending)); virthbainfo->serverdown = false; virthbainfo->serverchangingstate = false; virthbainfo->intr = virtpcidev->intr; /* save of host within virthba_info */ virthbainfo->scsihost = scsihost; /* save of host within virtpci_dev */ virtpcidev->scsi.scsihost = scsihost; /* Setup workqueue for serverdown messages */ INIT_WORK(&virthbainfo->serverdown_completion, virthba_serverdown_complete); writeq(readq(&virthbainfo->chinfo.queueinfo->chan->features) | ULTRA_IO_CHANNEL_IS_POLLING, &virthbainfo->chinfo.queueinfo->chan->features); /* start thread that will receive scsicmnd responses */ channel_header = virthbainfo->chinfo.queueinfo->chan; pqhdr = (struct signal_queue_header __iomem *) ((char __iomem *)channel_header + readq(&channel_header->ch_space_offset)) + IOCHAN_FROM_IOPART; virthbainfo->flags_addr = &pqhdr->features; if (!uisthread_start(&virthbainfo->chinfo.threadinfo, process_incoming_rsps, virthbainfo, "vhba_incoming")) { /* decr refcount on scsihost which was incremented by * scsi_add_host so the scsi_host gets deleted */ POSTCODE_LINUX_2(VHBA_PROBE_FAILURE_PC, POSTCODE_SEVERITY_ERR); scsi_host_put(scsihost); return -ENODEV; } virthbainfo->interrupt_vector = virthbainfo->intr.recv_irq_handle & INTERRUPT_VECTOR_MASK; rsp = request_irq(virthbainfo->interrupt_vector, handler, IRQF_SHARED, scsihost->hostt->name, virthbainfo); if (rsp != 0) { virthbainfo->interrupt_vector = -1; POSTCODE_LINUX_2(VHBA_PROBE_FAILURE_PC, POSTCODE_SEVERITY_ERR); } else { u64 __iomem *features_addr = &virthbainfo->chinfo.queueinfo->chan->features; mask = ~(ULTRA_IO_CHANNEL_IS_POLLING | ULTRA_IO_DRIVER_DISABLES_INTS); uisqueue_interlocked_and(features_addr, mask); mask = ULTRA_IO_DRIVER_ENABLES_INTS; uisqueue_interlocked_or(features_addr, mask); rsltq_wait_usecs = 4000000; } scsi_scan_host(scsihost); POSTCODE_LINUX_2(VHBA_PROBE_EXIT_PC, POSTCODE_SEVERITY_INFO); return 0; } static void virthba_remove(struct virtpci_dev *virtpcidev) { struct virthba_info *virthbainfo; struct Scsi_Host *scsihost = (struct Scsi_Host *)virtpcidev->scsi.scsihost; virthbainfo = (struct virthba_info *)scsihost->hostdata; if (virthbainfo->interrupt_vector != -1) free_irq(virthbainfo->interrupt_vector, virthbainfo); scsi_remove_host(scsihost); uisthread_stop(&virthbainfo->chinfo.threadinfo); /* decr refcount on scsihost which was incremented by * scsi_add_host so the scsi_host gets deleted */ scsi_host_put(scsihost); } static int forward_vdiskmgmt_command(enum vdisk_mgmt_types vdiskcmdtype, struct Scsi_Host *scsihost, struct uisscsi_dest *vdest) { struct uiscmdrsp *cmdrsp; struct virthba_info *virthbainfo = (struct virthba_info *)scsihost->hostdata; int notifyresult = 0xffff; wait_queue_head_t notifyevent; if (virthbainfo->serverdown || virthbainfo->serverchangingstate) return FAILED; cmdrsp = kzalloc(SIZEOF_CMDRSP, GFP_ATOMIC); if (!cmdrsp) return FAILED; /* reject */ init_waitqueue_head(¬ifyevent); /* issue VDISK_MGMT_CMD * set type to command - as opposed to task mgmt */ cmdrsp->cmdtype = CMD_VDISKMGMT_TYPE; /* specify the event that has to be triggered when this cmd is * complete */ cmdrsp->vdiskmgmt.notify = (void *)¬ifyevent; cmdrsp->vdiskmgmt.notifyresult = (void *)¬ifyresult; /* save destination */ cmdrsp->vdiskmgmt.vdisktype = vdiskcmdtype; cmdrsp->vdiskmgmt.vdest.channel = vdest->channel; cmdrsp->vdiskmgmt.vdest.id = vdest->id; cmdrsp->vdiskmgmt.vdest.lun = vdest->lun; cmdrsp->vdiskmgmt.scsicmd = (void *)(uintptr_t) add_scsipending_entry_with_wait(virthbainfo, CMD_VDISKMGMT_TYPE, (void *)cmdrsp); uisqueue_put_cmdrsp_with_lock_client(virthbainfo->chinfo.queueinfo, cmdrsp, IOCHAN_TO_IOPART, &virthbainfo->chinfo.insertlock, DONT_ISSUE_INTERRUPT, (u64)NULL, OK_TO_WAIT, "vhba"); wait_event(notifyevent, notifyresult != 0xffff); kfree(cmdrsp); return SUCCESS; } /*****************************************************/ /* Scsi Host support functions */ /*****************************************************/ static int forward_taskmgmt_command(enum task_mgmt_types tasktype, struct scsi_device *scsidev) { struct uiscmdrsp *cmdrsp; struct virthba_info *virthbainfo = (struct virthba_info *)scsidev->host->hostdata; int notifyresult = 0xffff; wait_queue_head_t notifyevent; if (virthbainfo->serverdown || virthbainfo->serverchangingstate) return FAILED; cmdrsp = kzalloc(SIZEOF_CMDRSP, GFP_ATOMIC); if (!cmdrsp) return FAILED; /* reject */ init_waitqueue_head(¬ifyevent); /* issue TASK_MGMT_ABORT_TASK */ /* set type to command - as opposed to task mgmt */ cmdrsp->cmdtype = CMD_SCSITASKMGMT_TYPE; /* specify the event that has to be triggered when this */ /* cmd is complete */ cmdrsp->scsitaskmgmt.notify = (void *)¬ifyevent; cmdrsp->scsitaskmgmt.notifyresult = (void *)¬ifyresult; /* save destination */ cmdrsp->scsitaskmgmt.tasktype = tasktype; cmdrsp->scsitaskmgmt.vdest.channel = scsidev->channel; cmdrsp->scsitaskmgmt.vdest.id = scsidev->id; cmdrsp->scsitaskmgmt.vdest.lun = scsidev->lun; cmdrsp->scsitaskmgmt.scsicmd = (void *)(uintptr_t) add_scsipending_entry_with_wait(virthbainfo, CMD_SCSITASKMGMT_TYPE, (void *)cmdrsp); uisqueue_put_cmdrsp_with_lock_client(virthbainfo->chinfo.queueinfo, cmdrsp, IOCHAN_TO_IOPART, &virthbainfo->chinfo.insertlock, DONT_ISSUE_INTERRUPT, (u64)NULL, OK_TO_WAIT, "vhba"); wait_event(notifyevent, notifyresult != 0xffff); kfree(cmdrsp); return SUCCESS; } /* The abort handler returns SUCCESS if it has succeeded to make LLDD * and all related hardware forget about the scmd. */ static int virthba_abort_handler(struct scsi_cmnd *scsicmd) { /* issue TASK_MGMT_ABORT_TASK */ struct scsi_device *scsidev; struct virtdisk_info *vdisk; scsidev = scsicmd->device; for (vdisk = &((struct virthba_info *)scsidev->host->hostdata)->head; vdisk->next; vdisk = vdisk->next) { if ((scsidev->channel == vdisk->channel) && (scsidev->id == vdisk->id) && (scsidev->lun == vdisk->lun)) { if (atomic_read(&vdisk->error_count) < VIRTHBA_ERROR_COUNT) { atomic_inc(&vdisk->error_count); POSTCODE_LINUX_2(VHBA_COMMAND_HANDLER_PC, POSTCODE_SEVERITY_INFO); } else atomic_set(&vdisk->ios_threshold, IOS_ERROR_THRESHOLD); } } return forward_taskmgmt_command(TASK_MGMT_ABORT_TASK, scsicmd->device); } static int virthba_bus_reset_handler(struct scsi_cmnd *scsicmd) { /* issue TASK_MGMT_TARGET_RESET for each target on the bus */ struct scsi_device *scsidev; struct virtdisk_info *vdisk; scsidev = scsicmd->device; for (vdisk = &((struct virthba_info *)scsidev->host->hostdata)->head; vdisk->next; vdisk = vdisk->next) { if ((scsidev->channel == vdisk->channel) && (scsidev->id == vdisk->id) && (scsidev->lun == vdisk->lun)) { if (atomic_read(&vdisk->error_count) < VIRTHBA_ERROR_COUNT) { atomic_inc(&vdisk->error_count); POSTCODE_LINUX_2(VHBA_COMMAND_HANDLER_PC, POSTCODE_SEVERITY_INFO); } else atomic_set(&vdisk->ios_threshold, IOS_ERROR_THRESHOLD); } } return forward_taskmgmt_command(TASK_MGMT_BUS_RESET, scsicmd->device); } static int virthba_device_reset_handler(struct scsi_cmnd *scsicmd) { /* issue TASK_MGMT_LUN_RESET */ struct scsi_device *scsidev; struct virtdisk_info *vdisk; scsidev = scsicmd->device; for (vdisk = &((struct virthba_info *)scsidev->host->hostdata)->head; vdisk->next; vdisk = vdisk->next) { if ((scsidev->channel == vdisk->channel) && (scsidev->id == vdisk->id) && (scsidev->lun == vdisk->lun)) { if (atomic_read(&vdisk->error_count) < VIRTHBA_ERROR_COUNT) { atomic_inc(&vdisk->error_count); POSTCODE_LINUX_2(VHBA_COMMAND_HANDLER_PC, POSTCODE_SEVERITY_INFO); } else atomic_set(&vdisk->ios_threshold, IOS_ERROR_THRESHOLD); } } return forward_taskmgmt_command(TASK_MGMT_LUN_RESET, scsicmd->device); } static int virthba_host_reset_handler(struct scsi_cmnd *scsicmd) { /* issue TASK_MGMT_TARGET_RESET for each target on each bus for host */ return SUCCESS; } static char virthba_get_info_str[256]; static const char * virthba_get_info(struct Scsi_Host *shp) { /* Return version string */ sprintf(virthba_get_info_str, "virthba, version %s\n", VIRTHBA_VERSION); return virthba_get_info_str; } static int virthba_ioctl(struct scsi_device *dev, int cmd, void __user *arg) { return -EINVAL; } /* This returns SCSI_MLQUEUE_DEVICE_BUSY if the signal queue to IOpart * is full. */ static int virthba_queue_command_lck(struct scsi_cmnd *scsicmd, void (*virthba_cmnd_done)(struct scsi_cmnd *)) { struct scsi_device *scsidev = scsicmd->device; int insert_location; unsigned char op; unsigned char *cdb = scsicmd->cmnd; struct Scsi_Host *scsihost = scsidev->host; struct uiscmdrsp *cmdrsp; unsigned int i; struct virthba_info *virthbainfo = (struct virthba_info *)scsihost->hostdata; struct scatterlist *sg = NULL; struct scatterlist *sgl = NULL; int sg_failed = 0; if (virthbainfo->serverdown || virthbainfo->serverchangingstate) return SCSI_MLQUEUE_DEVICE_BUSY; cmdrsp = kzalloc(SIZEOF_CMDRSP, GFP_ATOMIC); if (!cmdrsp) return 1; /* reject the command */ /* now saving everything we need from scsi_cmd into cmdrsp * before we queue cmdrsp set type to command - as opposed to * task mgmt */ cmdrsp->cmdtype = CMD_SCSI_TYPE; /* save the pending insertion location. Deletion from pending * will return the scsicmd pointer for completion */ insert_location = add_scsipending_entry(virthbainfo, CMD_SCSI_TYPE, (void *)scsicmd); if (insert_location != -1) { cmdrsp->scsi.scsicmd = (void *)(uintptr_t)insert_location; } else { kfree(cmdrsp); return SCSI_MLQUEUE_DEVICE_BUSY; } /* save done function that we have call when cmd is complete */ scsicmd->scsi_done = virthba_cmnd_done; /* save destination */ cmdrsp->scsi.vdest.channel = scsidev->channel; cmdrsp->scsi.vdest.id = scsidev->id; cmdrsp->scsi.vdest.lun = scsidev->lun; /* save datadir */ cmdrsp->scsi.data_dir = scsicmd->sc_data_direction; memcpy(cmdrsp->scsi.cmnd, cdb, MAX_CMND_SIZE); cmdrsp->scsi.bufflen = scsi_bufflen(scsicmd); /* keep track of the max buffer length so far. */ if (cmdrsp->scsi.bufflen > max_buff_len) max_buff_len = cmdrsp->scsi.bufflen; if (scsi_sg_count(scsicmd) > MAX_PHYS_INFO) { del_scsipending_entry(virthbainfo, (uintptr_t)insert_location); kfree(cmdrsp); return 1; /* reject the command */ } /* This is what we USED to do when we assumed we were running */ /* uissd & virthba on the same Linux system. */ /* cmdrsp->scsi.buffer = scsicmd->request_buffer; */ /* The following code does NOT make that assumption. */ /* convert buffer to phys information */ if (scsi_sg_count(scsicmd) == 0) { if (scsi_bufflen(scsicmd) > 0) { BUG_ON(scsi_sg_count(scsicmd) == 0); } } else { /* buffer is scatterlist - copy it out */ sgl = scsi_sglist(scsicmd); for_each_sg(sgl, sg, scsi_sg_count(scsicmd), i) { cmdrsp->scsi.gpi_list[i].address = sg_phys(sg); cmdrsp->scsi.gpi_list[i].length = sg->length; } if (sg_failed) { /* BUG(); ***** For now, let it fail in uissd * if it is a problem, as it might just * work */ } cmdrsp->scsi.guest_phys_entries = scsi_sg_count(scsicmd); } op = cdb[0]; i = uisqueue_put_cmdrsp_with_lock_client(virthbainfo->chinfo.queueinfo, cmdrsp, IOCHAN_TO_IOPART, &virthbainfo->chinfo. insertlock, DONT_ISSUE_INTERRUPT, (u64)NULL, DONT_WAIT, "vhba"); if (i == 0) { /* queue must be full - and we said don't wait - return busy */ kfree(cmdrsp); del_scsipending_entry(virthbainfo, (uintptr_t)insert_location); return SCSI_MLQUEUE_DEVICE_BUSY; } /* we're done with cmdrsp space - data from it has been copied * into channel - free it now. */ kfree(cmdrsp); return 0; /* non-zero implies host/device is busy */ } static int virthba_slave_alloc(struct scsi_device *scsidev) { /* this called by the midlayer before scan for new devices - * LLD can alloc any struct & do init if needed. */ struct virtdisk_info *vdisk; struct virtdisk_info *tmpvdisk; struct virthba_info *virthbainfo; struct Scsi_Host *scsihost = (struct Scsi_Host *)scsidev->host; virthbainfo = (struct virthba_info *)scsihost->hostdata; if (!virthbainfo) return 0; /* even though we errored, treat as success */ for (vdisk = &virthbainfo->head; vdisk->next; vdisk = vdisk->next) { if (vdisk->next->valid && (vdisk->next->channel == scsidev->channel) && (vdisk->next->id == scsidev->id) && (vdisk->next->lun == scsidev->lun)) return 0; } tmpvdisk = kzalloc(sizeof(*tmpvdisk), GFP_ATOMIC); if (!tmpvdisk) return 0; tmpvdisk->channel = scsidev->channel; tmpvdisk->id = scsidev->id; tmpvdisk->lun = scsidev->lun; tmpvdisk->valid = 1; vdisk->next = tmpvdisk; return 0; /* success */ } static int virthba_slave_configure(struct scsi_device *scsidev) { return 0; /* success */ } static void virthba_slave_destroy(struct scsi_device *scsidev) { /* midlevel calls this after device has been quiesced and * before it is to be deleted. */ struct virtdisk_info *vdisk, *delvdisk; struct virthba_info *virthbainfo; struct Scsi_Host *scsihost = (struct Scsi_Host *)scsidev->host; virthbainfo = (struct virthba_info *)scsihost->hostdata; for (vdisk = &virthbainfo->head; vdisk->next; vdisk = vdisk->next) { if (vdisk->next->valid && (vdisk->next->channel == scsidev->channel) && (vdisk->next->id == scsidev->id) && (vdisk->next->lun == scsidev->lun)) { delvdisk = vdisk->next; vdisk->next = vdisk->next->next; kfree(delvdisk); return; } } } /*****************************************************/ /* Scsi Cmnd support thread */ /*****************************************************/ static void do_scsi_linuxstat(struct uiscmdrsp *cmdrsp, struct scsi_cmnd *scsicmd) { struct virtdisk_info *vdisk; struct scsi_device *scsidev; struct sense_data *sd; scsidev = scsicmd->device; memcpy(scsicmd->sense_buffer, cmdrsp->scsi.sensebuf, MAX_SENSE_SIZE); sd = (struct sense_data *)scsicmd->sense_buffer; /* Do not log errors for disk-not-present inquiries */ if ((cmdrsp->scsi.cmnd[0] == INQUIRY) && (host_byte(cmdrsp->scsi.linuxstat) == DID_NO_CONNECT) && (cmdrsp->scsi.addlstat == ADDL_SEL_TIMEOUT)) return; /* Okay see what our error_count is here.... */ for (vdisk = &((struct virthba_info *)scsidev->host->hostdata)->head; vdisk->next; vdisk = vdisk->next) { if ((scsidev->channel != vdisk->channel) || (scsidev->id != vdisk->id) || (scsidev->lun != vdisk->lun)) continue; if (atomic_read(&vdisk->error_count) < VIRTHBA_ERROR_COUNT) { atomic_inc(&vdisk->error_count); atomic_set(&vdisk->ios_threshold, IOS_ERROR_THRESHOLD); } } } static void do_scsi_nolinuxstat(struct uiscmdrsp *cmdrsp, struct scsi_cmnd *scsicmd) { struct scsi_device *scsidev; unsigned char buf[36]; struct scatterlist *sg; unsigned int i; char *thispage; char *thispage_orig; int bufind = 0; struct virtdisk_info *vdisk; scsidev = scsicmd->device; if ((cmdrsp->scsi.cmnd[0] == INQUIRY) && (cmdrsp->scsi.bufflen >= MIN_INQUIRY_RESULT_LEN)) { if (cmdrsp->scsi.no_disk_result == 0) return; /* Linux scsi code is weird; it wants * a device at Lun 0 to issue report * luns, but we don't want a disk * there so we'll present a processor * there. */ SET_NO_DISK_INQUIRY_RESULT(buf, cmdrsp->scsi.bufflen, scsidev->lun, DEV_DISK_CAPABLE_NOT_PRESENT, DEV_NOT_CAPABLE); if (scsi_sg_count(scsicmd) == 0) { if (scsi_bufflen(scsicmd) > 0) { BUG_ON(scsi_sg_count(scsicmd) == 0); } memcpy(scsi_sglist(scsicmd), buf, cmdrsp->scsi.bufflen); return; } sg = scsi_sglist(scsicmd); for (i = 0; i < scsi_sg_count(scsicmd); i++) { thispage_orig = kmap_atomic(sg_page(sg + i)); thispage = (void *)((unsigned long)thispage_orig | sg[i].offset); memcpy(thispage, buf + bufind, sg[i].length); kunmap_atomic(thispage_orig); bufind += sg[i].length; } } else { vdisk = &((struct virthba_info *)scsidev->host->hostdata)->head; for ( ; vdisk->next; vdisk = vdisk->next) { if ((scsidev->channel != vdisk->channel) || (scsidev->id != vdisk->id) || (scsidev->lun != vdisk->lun)) continue; if (atomic_read(&vdisk->ios_threshold) > 0) { atomic_dec(&vdisk->ios_threshold); if (atomic_read(&vdisk->ios_threshold) == 0) { atomic_set(&vdisk->error_count, 0); } } } } } static void complete_scsi_command(struct uiscmdrsp *cmdrsp, struct scsi_cmnd *scsicmd) { /* take what we need out of cmdrsp and complete the scsicmd */ scsicmd->result = cmdrsp->scsi.linuxstat; if (cmdrsp->scsi.linuxstat) do_scsi_linuxstat(cmdrsp, scsicmd); else do_scsi_nolinuxstat(cmdrsp, scsicmd); if (scsicmd->scsi_done) scsicmd->scsi_done(scsicmd); } static inline void complete_vdiskmgmt_command(struct uiscmdrsp *cmdrsp) { /* copy the result of the taskmgmt and */ /* wake up the error handler that is waiting for this */ *(int *)cmdrsp->vdiskmgmt.notifyresult = cmdrsp->vdiskmgmt.result; wake_up_all((wait_queue_head_t *)cmdrsp->vdiskmgmt.notify); } static inline void complete_taskmgmt_command(struct uiscmdrsp *cmdrsp) { /* copy the result of the taskmgmt and */ /* wake up the error handler that is waiting for this */ *(int *)cmdrsp->scsitaskmgmt.notifyresult = cmdrsp->scsitaskmgmt.result; wake_up_all((wait_queue_head_t *)cmdrsp->scsitaskmgmt.notify); } static void drain_queue(struct virthba_info *virthbainfo, struct chaninfo *dc, struct uiscmdrsp *cmdrsp) { unsigned long flags; int qrslt = 0; struct scsi_cmnd *scsicmd; struct Scsi_Host *shost = virthbainfo->scsihost; while (1) { spin_lock_irqsave(&virthbainfo->chinfo.insertlock, flags); if (!spar_channel_client_acquire_os(dc->queueinfo->chan, "vhba")) { spin_unlock_irqrestore(&virthbainfo->chinfo.insertlock, flags); virthbainfo->acquire_failed_cnt++; break; } qrslt = uisqueue_get_cmdrsp(dc->queueinfo, cmdrsp, IOCHAN_FROM_IOPART); spar_channel_client_release_os(dc->queueinfo->chan, "vhba"); spin_unlock_irqrestore(&virthbainfo->chinfo.insertlock, flags); if (qrslt == 0) break; if (cmdrsp->cmdtype == CMD_SCSI_TYPE) { /* scsicmd location is returned by the * deletion */ scsicmd = del_scsipending_entry(virthbainfo, (uintptr_t) cmdrsp->scsi.scsicmd); if (!scsicmd) break; /* complete the orig cmd */ complete_scsi_command(cmdrsp, scsicmd); } else if (cmdrsp->cmdtype == CMD_SCSITASKMGMT_TYPE) { if (!del_scsipending_entry(virthbainfo, (uintptr_t)cmdrsp->scsitaskmgmt.scsicmd)) break; complete_taskmgmt_command(cmdrsp); } else if (cmdrsp->cmdtype == CMD_NOTIFYGUEST_TYPE) { /* The vHba pointer has no meaning in * a Client/Guest Partition. Let's be * safe and set it to NULL now. Do * not use it here! */ cmdrsp->disknotify.v_hba = NULL; process_disk_notify(shost, cmdrsp); } else if (cmdrsp->cmdtype == CMD_VDISKMGMT_TYPE) { if (!del_scsipending_entry(virthbainfo, (uintptr_t) cmdrsp->vdiskmgmt.scsicmd)) break; complete_vdiskmgmt_command(cmdrsp); } /* cmdrsp is now available for reuse */ } } /* main function for the thread that waits for scsi commands to arrive * in a specified queue */ static int process_incoming_rsps(void *v) { struct virthba_info *virthbainfo = v; struct chaninfo *dc = &virthbainfo->chinfo; struct uiscmdrsp *cmdrsp = NULL; const int SZ = sizeof(struct uiscmdrsp); u64 mask; unsigned long long rc1; UIS_DAEMONIZE("vhba_incoming"); /* alloc once and reuse */ cmdrsp = kmalloc(SZ, GFP_ATOMIC); if (!cmdrsp) { complete_and_exit(&dc->threadinfo.has_stopped, 0); return 0; } mask = ULTRA_CHANNEL_ENABLE_INTS; while (1) { if (kthread_should_stop()) break; wait_event_interruptible_timeout(virthbainfo->rsp_queue, (atomic_read(&virthbainfo->interrupt_rcvd) == 1), usecs_to_jiffies(rsltq_wait_usecs)); atomic_set(&virthbainfo->interrupt_rcvd, 0); /* drain queue */ drain_queue(virthbainfo, dc, cmdrsp); rc1 = uisqueue_interlocked_or(virthbainfo->flags_addr, mask); } kfree(cmdrsp); complete_and_exit(&dc->threadinfo.has_stopped, 0); } /*****************************************************/ /* Debugfs filesystem functions */ /*****************************************************/ static ssize_t info_debugfs_read(struct file *file, char __user *buf, size_t len, loff_t *offset) { ssize_t bytes_read = 0; int str_pos = 0; u64 phys_flags_addr; int i; struct virthba_info *virthbainfo; char *vbuf; if (len > MAX_BUF) len = MAX_BUF; vbuf = kzalloc(len, GFP_KERNEL); if (!vbuf) return -ENOMEM; for (i = 0; i < VIRTHBASOPENMAX; i++) { if (!virthbas_open[i].virthbainfo) continue; virthbainfo = virthbas_open[i].virthbainfo; str_pos += scnprintf(vbuf + str_pos, len - str_pos, "max_buff_len:%u\n", max_buff_len); str_pos += scnprintf(vbuf + str_pos, len - str_pos, "\nvirthba result queue poll wait:%d usecs.\n", rsltq_wait_usecs); str_pos += scnprintf(vbuf + str_pos, len - str_pos, "\ninterrupts_rcvd = %llu, interrupts_disabled = %llu\n", virthbainfo->interrupts_rcvd, virthbainfo->interrupts_disabled); str_pos += scnprintf(vbuf + str_pos, len - str_pos, "\ninterrupts_notme = %llu,\n", virthbainfo->interrupts_notme); phys_flags_addr = virt_to_phys((__force void *) virthbainfo->flags_addr); str_pos += scnprintf(vbuf + str_pos, len - str_pos, "flags_addr = %p, phys_flags_addr=0x%016llx, FeatureFlags=%llu\n", virthbainfo->flags_addr, phys_flags_addr, (__le64)readq(virthbainfo->flags_addr)); str_pos += scnprintf(vbuf + str_pos, len - str_pos, "acquire_failed_cnt:%llu\n", virthbainfo->acquire_failed_cnt); str_pos += scnprintf(vbuf + str_pos, len - str_pos, "\n"); } bytes_read = simple_read_from_buffer(buf, len, offset, vbuf, str_pos); kfree(vbuf); return bytes_read; } static ssize_t enable_ints_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) { char buf[4]; int i, new_value; struct virthba_info *virthbainfo; u64 __iomem *features_addr; u64 mask; if (count >= ARRAY_SIZE(buf)) return -EINVAL; buf[count] = '\0'; if (copy_from_user(buf, buffer, count)) return -EFAULT; i = kstrtoint(buf, 10, &new_value); if (i != 0) return -EFAULT; /* set all counts to new_value usually 0 */ for (i = 0; i < VIRTHBASOPENMAX; i++) { if (virthbas_open[i].virthbainfo) { virthbainfo = virthbas_open[i].virthbainfo; features_addr = &virthbainfo->chinfo.queueinfo->chan->features; if (new_value == 1) { mask = ~(ULTRA_IO_CHANNEL_IS_POLLING | ULTRA_IO_DRIVER_DISABLES_INTS); uisqueue_interlocked_and(features_addr, mask); mask = ULTRA_IO_DRIVER_ENABLES_INTS; uisqueue_interlocked_or(features_addr, mask); rsltq_wait_usecs = 4000000; } else { mask = ~(ULTRA_IO_DRIVER_ENABLES_INTS | ULTRA_IO_DRIVER_DISABLES_INTS); uisqueue_interlocked_and(features_addr, mask); mask = ULTRA_IO_CHANNEL_IS_POLLING; uisqueue_interlocked_or(features_addr, mask); rsltq_wait_usecs = 4000; } } } return count; } /* As per VirtpciFunc returns 1 for success and 0 for failure */ static int virthba_serverup(struct virtpci_dev *virtpcidev) { struct virthba_info *virthbainfo = (struct virthba_info *)((struct Scsi_Host *)virtpcidev->scsi. scsihost)->hostdata; if (!virthbainfo->serverdown) return 1; if (virthbainfo->serverchangingstate) return 0; virthbainfo->serverchangingstate = true; /* Must transition channel to ATTACHED state BEFORE we * can start using the device again */ SPAR_CHANNEL_CLIENT_TRANSITION(virthbainfo->chinfo.queueinfo->chan, dev_name(&virtpcidev->generic_dev), CHANNELCLI_ATTACHED, NULL); /* Start Processing the IOVM Response Queue Again */ if (!uisthread_start(&virthbainfo->chinfo.threadinfo, process_incoming_rsps, virthbainfo, "vhba_incoming")) { return 0; } virthbainfo->serverdown = false; virthbainfo->serverchangingstate = false; return 1; } static void virthba_serverdown_complete(struct work_struct *work) { struct virthba_info *virthbainfo; struct virtpci_dev *virtpcidev; int i; struct scsipending *pendingdel = NULL; struct scsi_cmnd *scsicmd = NULL; struct uiscmdrsp *cmdrsp; unsigned long flags; virthbainfo = container_of(work, struct virthba_info, serverdown_completion); /* Stop Using the IOVM Response Queue (queue should be drained * by the end) */ uisthread_stop(&virthbainfo->chinfo.threadinfo); /* Fail Commands that weren't completed */ spin_lock_irqsave(&virthbainfo->privlock, flags); for (i = 0; i < MAX_PENDING_REQUESTS; i++) { pendingdel = &virthbainfo->pending[i]; switch (pendingdel->cmdtype) { case CMD_SCSI_TYPE: scsicmd = (struct scsi_cmnd *)pendingdel->sent; scsicmd->result = DID_RESET << 16; if (scsicmd->scsi_done) scsicmd->scsi_done(scsicmd); break; case CMD_SCSITASKMGMT_TYPE: cmdrsp = (struct uiscmdrsp *)pendingdel->sent; wake_up_all((wait_queue_head_t *) cmdrsp->scsitaskmgmt.notify); *(int *)cmdrsp->scsitaskmgmt.notifyresult = TASK_MGMT_FAILED; break; case CMD_VDISKMGMT_TYPE: cmdrsp = (struct uiscmdrsp *)pendingdel->sent; *(int *)cmdrsp->vdiskmgmt.notifyresult = VDISK_MGMT_FAILED; wake_up_all((wait_queue_head_t *) cmdrsp->vdiskmgmt.notify); break; default: break; } pendingdel->cmdtype = 0; pendingdel->sent = NULL; } spin_unlock_irqrestore(&virthbainfo->privlock, flags); virtpcidev = virthbainfo->virtpcidev; virthbainfo->serverdown = true; virthbainfo->serverchangingstate = false; /* Return the ServerDown response to Command */ visorchipset_device_pause_response(virtpcidev->bus_no, virtpcidev->device_no, 0); } /* As per VirtpciFunc returns 1 for success and 0 for failure */ static int virthba_serverdown(struct virtpci_dev *virtpcidev, u32 state) { int stat = 1; struct virthba_info *virthbainfo = (struct virthba_info *)((struct Scsi_Host *)virtpcidev->scsi. scsihost)->hostdata; if (!virthbainfo->serverdown && !virthbainfo->serverchangingstate) { virthbainfo->serverchangingstate = true; queue_work(virthba_serverdown_workqueue, &virthbainfo->serverdown_completion); } else if (virthbainfo->serverchangingstate) { stat = 0; } return stat; } /*****************************************************/ /* Module Init & Exit functions */ /*****************************************************/ static int __init virthba_parse_line(char *str) { return 1; } static void __init virthba_parse_options(char *line) { char *next = line; POSTCODE_LINUX_2(VHBA_CREATE_ENTRY_PC, POSTCODE_SEVERITY_INFO); if (!line || !*line) return; while ((line = next)) { next = strchr(line, ' '); if (next) *next++ = 0; virthba_parse_line(line); } POSTCODE_LINUX_2(VHBA_CREATE_EXIT_PC, POSTCODE_SEVERITY_INFO); } static int __init virthba_mod_init(void) { int error; int i; if (!unisys_spar_platform) return -ENODEV; POSTCODE_LINUX_2(VHBA_CREATE_ENTRY_PC, POSTCODE_SEVERITY_INFO); virthba_parse_options(virthba_options); error = virtpci_register_driver(&virthba_driver); if (error < 0) { POSTCODE_LINUX_3(VHBA_CREATE_FAILURE_PC, error, POSTCODE_SEVERITY_ERR); } else { /* create the debugfs directories and entries */ virthba_debugfs_dir = debugfs_create_dir("virthba", NULL); debugfs_create_file("info", S_IRUSR, virthba_debugfs_dir, NULL, &debugfs_info_fops); debugfs_create_u32("rqwait_usecs", S_IRUSR | S_IWUSR, virthba_debugfs_dir, &rsltq_wait_usecs); debugfs_create_file("enable_ints", S_IWUSR, virthba_debugfs_dir, NULL, &debugfs_enable_ints_fops); /* Initialize dar_work_queue */ INIT_WORK(&dar_work_queue, do_disk_add_remove); spin_lock_init(&dar_work_queue_lock); /* clear out array */ for (i = 0; i < VIRTHBASOPENMAX; i++) virthbas_open[i].virthbainfo = NULL; /* Initialize the serverdown workqueue */ virthba_serverdown_workqueue = create_singlethread_workqueue("virthba_serverdown"); if (!virthba_serverdown_workqueue) { POSTCODE_LINUX_2(VHBA_CREATE_FAILURE_PC, POSTCODE_SEVERITY_ERR); error = -1; } } POSTCODE_LINUX_2(VHBA_CREATE_EXIT_PC, POSTCODE_SEVERITY_INFO); return error; } static ssize_t virthba_acquire_lun(struct device *cdev, struct device_attribute *attr, const char *buf, size_t count) { struct uisscsi_dest vdest; struct Scsi_Host *shost = class_to_shost(cdev); int i; i = sscanf(buf, "%d-%d-%d", &vdest.channel, &vdest.id, &vdest.lun); if (i != 3) return i; return forward_vdiskmgmt_command(VDISK_MGMT_ACQUIRE, shost, &vdest); } static ssize_t virthba_release_lun(struct device *cdev, struct device_attribute *attr, const char *buf, size_t count) { struct uisscsi_dest vdest; struct Scsi_Host *shost = class_to_shost(cdev); int i; i = sscanf(buf, "%d-%d-%d", &vdest.channel, &vdest.id, &vdest.lun); if (i != 3) return i; return forward_vdiskmgmt_command(VDISK_MGMT_RELEASE, shost, &vdest); } #define CLASS_DEVICE_ATTR(_name, _mode, _show, _store) \ struct device_attribute class_device_attr_##_name = \ __ATTR(_name, _mode, _show, _store) static CLASS_DEVICE_ATTR(acquire_lun, S_IWUSR, NULL, virthba_acquire_lun); static CLASS_DEVICE_ATTR(release_lun, S_IWUSR, NULL, virthba_release_lun); static DEVICE_ATTRIBUTE *virthba_shost_attrs[] = { &class_device_attr_acquire_lun, &class_device_attr_release_lun, NULL }; static void __exit virthba_mod_exit(void) { virtpci_unregister_driver(&virthba_driver); /* unregister is going to call virthba_remove */ /* destroy serverdown completion workqueue */ if (virthba_serverdown_workqueue) { destroy_workqueue(virthba_serverdown_workqueue); virthba_serverdown_workqueue = NULL; } debugfs_remove_recursive(virthba_debugfs_dir); } /* specify function to be run at module insertion time */ module_init(virthba_mod_init); /* specify function to be run when module is removed */ module_exit(virthba_mod_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Usha Srinivasan"); MODULE_ALIAS("uisvirthba"); /* this is extracted during depmod and kept in modules.dep */ /* module parameter */ module_param(virthba_options, charp, S_IRUGO);