diff options
Diffstat (limited to 'drivers/staging/unisys/visorhba')
| -rw-r--r-- | drivers/staging/unisys/visorhba/Kconfig | 15 | ||||
| -rw-r--r-- | drivers/staging/unisys/visorhba/Makefile | 10 | ||||
| -rw-r--r-- | drivers/staging/unisys/visorhba/visorhba_main.c | 1142 |
3 files changed, 0 insertions, 1167 deletions
diff --git a/drivers/staging/unisys/visorhba/Kconfig b/drivers/staging/unisys/visorhba/Kconfig deleted file mode 100644 index ed59ac11c322..000000000000 --- a/drivers/staging/unisys/visorhba/Kconfig +++ /dev/null @@ -1,15 +0,0 @@ -# SPDX-License-Identifier: GPL-2.0 -# -# Unisys visorhba configuration -# - -config UNISYS_VISORHBA - tristate "Unisys visorhba driver" - depends on UNISYSSPAR && UNISYS_VISORBUS && SCSI - help - The Unisys visorhba driver provides support for s-Par HBA - devices exposed on the s-Par visorbus. When a message is sent - to visorbus to create a HBA device, the probe function of - visorhba is called to create the scsi device. - If you say Y here, you will enable the Unisys visorhba driver. - diff --git a/drivers/staging/unisys/visorhba/Makefile b/drivers/staging/unisys/visorhba/Makefile deleted file mode 100644 index b613a7dcdae9..000000000000 --- a/drivers/staging/unisys/visorhba/Makefile +++ /dev/null @@ -1,10 +0,0 @@ -# SPDX-License-Identifier: GPL-2.0 -# -# Makefile for Unisys channel -# - -obj-$(CONFIG_UNISYS_VISORHBA) += visorhba.o - -visorhba-y := visorhba_main.o - -ccflags-y += -I $(srctree)/$(src)/../include diff --git a/drivers/staging/unisys/visorhba/visorhba_main.c b/drivers/staging/unisys/visorhba/visorhba_main.c deleted file mode 100644 index 694644112447..000000000000 --- a/drivers/staging/unisys/visorhba/visorhba_main.c +++ /dev/null @@ -1,1142 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * Copyright (c) 2012 - 2015 UNISYS CORPORATION - * All rights reserved. - */ - -#include <linux/debugfs.h> -#include <linux/kthread.h> -#include <linux/module.h> -#include <linux/seq_file.h> -#include <linux/visorbus.h> -#include <linux/xarray.h> -#include <scsi/scsi.h> -#include <scsi/scsi_host.h> -#include <scsi/scsi_cmnd.h> -#include <scsi/scsi_device.h> - -#include "iochannel.h" - -/* The Send and Receive Buffers of the IO Queue may both be full */ - -#define IOS_ERROR_THRESHOLD 1000 -#define MAX_PENDING_REQUESTS (MIN_NUMSIGNALS * 2) -#define VISORHBA_ERROR_COUNT 30 - -static struct dentry *visorhba_debugfs_dir; - -/* GUIDS for HBA channel type supported by this driver */ -static struct visor_channeltype_descriptor visorhba_channel_types[] = { - /* Note that the only channel type we expect to be reported by the - * bus driver is the VISOR_VHBA channel. - */ - { VISOR_VHBA_CHANNEL_GUID, "sparvhba", sizeof(struct channel_header), - VISOR_VHBA_CHANNEL_VERSIONID }, - {} -}; - -MODULE_DEVICE_TABLE(visorbus, visorhba_channel_types); -MODULE_ALIAS("visorbus:" VISOR_VHBA_CHANNEL_GUID_STR); - -struct visordisk_info { - struct scsi_device *sdev; - u32 valid; - atomic_t ios_threshold; - atomic_t error_count; - struct visordisk_info *next; -}; - -struct scsipending { - struct uiscmdrsp cmdrsp; - /* The Data being tracked */ - void *sent; - /* Type of pointer that is being stored */ - char cmdtype; -}; - -/* Each scsi_host has a host_data area that contains this struct. */ -struct visorhba_devdata { - struct Scsi_Host *scsihost; - struct visor_device *dev; - struct list_head dev_info_list; - /* Tracks the requests that have been forwarded to - * the IOVM and haven't returned yet - */ - struct scsipending pending[MAX_PENDING_REQUESTS]; - /* Start search for next pending free slot here */ - unsigned int nextinsert; - /* lock to protect data in devdata */ - 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; - u64 __iomem *flags_addr; - struct visordisk_info head; - unsigned int max_buff_len; - int devnum; - struct uiscmdrsp *cmdrsp; - /* - * allows us to pass int handles back-and-forth between us and - * iovm, instead of raw pointers - */ - struct xarray xa; - struct dentry *debugfs_dir; - struct dentry *debugfs_info; -}; - -struct visorhba_devices_open { - struct visorhba_devdata *devdata; -}; - -/* - * add_scsipending_entry - Save off io command that is pending in - * Service Partition - * @devdata: Pointer to devdata - * @cmdtype: Specifies the type of command pending - * @new: The command to be saved - * - * Saves off the io command that is being handled by the Service - * Partition so that it can be handled when it completes. If new is - * NULL it is assumed the entry refers only to the cmdrsp. - * - * Return: Insert_location where entry was added on success, - * -EBUSY if it can't - */ -static int add_scsipending_entry(struct visorhba_devdata *devdata, - char cmdtype, void *new) -{ - unsigned long flags; - struct scsipending *entry; - int insert_location; - - spin_lock_irqsave(&devdata->privlock, flags); - insert_location = devdata->nextinsert; - while (devdata->pending[insert_location].sent) { - insert_location = (insert_location + 1) % MAX_PENDING_REQUESTS; - if (insert_location == (int)devdata->nextinsert) { - spin_unlock_irqrestore(&devdata->privlock, flags); - return -EBUSY; - } - } - - entry = &devdata->pending[insert_location]; - memset(&entry->cmdrsp, 0, sizeof(entry->cmdrsp)); - entry->cmdtype = cmdtype; - if (new) - entry->sent = new; - /* wants to send cmdrsp */ - else - entry->sent = &entry->cmdrsp; - devdata->nextinsert = (insert_location + 1) % MAX_PENDING_REQUESTS; - spin_unlock_irqrestore(&devdata->privlock, flags); - - return insert_location; -} - -/* - * del_scsipending_ent - Removes an entry from the pending array - * @devdata: Device holding the pending array - * @del: Entry to remove - * - * Removes the entry pointed at by del and returns it. - * - * Return: The scsipending entry pointed to on success, NULL on failure - */ -static void *del_scsipending_ent(struct visorhba_devdata *devdata, int del) -{ - unsigned long flags; - void *sent; - - if (del >= MAX_PENDING_REQUESTS) - return NULL; - - spin_lock_irqsave(&devdata->privlock, flags); - sent = devdata->pending[del].sent; - devdata->pending[del].cmdtype = 0; - devdata->pending[del].sent = NULL; - spin_unlock_irqrestore(&devdata->privlock, flags); - - return sent; -} - -/* - * get_scsipending_cmdrsp - Return the cmdrsp stored in a pending entry - * @ddata: Device holding the pending array - * @ent: Entry that stores the cmdrsp - * - * Each scsipending entry has a cmdrsp in it. The cmdrsp is only valid - * if the "sent" field is not NULL. - * - * Return: A pointer to the cmdrsp, NULL on failure - */ -static struct uiscmdrsp *get_scsipending_cmdrsp(struct visorhba_devdata *ddata, - int ent) -{ - if (ddata->pending[ent].sent) - return &ddata->pending[ent].cmdrsp; - - return NULL; -} - -/* - * setup_scsitaskmgmt_handles - Stash the necessary handles so that the - * completion processing logic for a taskmgmt - * cmd will be able to find who to wake up - * and where to stash the result - * @xa: The data object maintaining the pointer<-->int mappings - * @cmdrsp: Response from the IOVM - * @event: The event handle to associate with an id - * @result: The location to place the result of the event handle into - */ -static int setup_scsitaskmgmt_handles(struct xarray *xa, struct uiscmdrsp *cmdrsp, - wait_queue_head_t *event, int *result) -{ - int ret; - u32 id; - - /* specify the event that has to be triggered when this cmd is complete */ - ret = xa_alloc_irq(xa, &id, event, xa_limit_32b, GFP_KERNEL); - if (ret) - return ret; - cmdrsp->scsitaskmgmt.notify_handle = id; - ret = xa_alloc_irq(xa, &id, result, xa_limit_32b, GFP_KERNEL); - if (ret) { - xa_erase_irq(xa, cmdrsp->scsitaskmgmt.notify_handle); - return ret; - } - cmdrsp->scsitaskmgmt.notifyresult_handle = id; - - return 0; -} - -/* - * cleanup_scsitaskmgmt_handles - Forget handles created by - * setup_scsitaskmgmt_handles() - * @xa: The data object maintaining the pointer<-->int mappings - * @cmdrsp: Response from the IOVM - */ -static void cleanup_scsitaskmgmt_handles(struct xarray *xa, - struct uiscmdrsp *cmdrsp) -{ - xa_erase_irq(xa, cmdrsp->scsitaskmgmt.notify_handle); - xa_erase_irq(xa, cmdrsp->scsitaskmgmt.notifyresult_handle); -} - -/* - * forward_taskmgmt_command - Send taskmegmt command to the Service - * Partition - * @tasktype: Type of taskmgmt command - * @scsidev: Scsidev that issued command - * - * Create a cmdrsp packet and send it to the Service Partition - * that will service this request. - * - * Return: Int representing whether command was queued successfully or not - */ -static int forward_taskmgmt_command(enum task_mgmt_types tasktype, - struct scsi_device *scsidev) -{ - struct uiscmdrsp *cmdrsp; - struct visorhba_devdata *devdata = - (struct visorhba_devdata *)scsidev->host->hostdata; - int notifyresult = 0xffff; - wait_queue_head_t notifyevent; - int scsicmd_id; - int ret; - - if (devdata->serverdown || devdata->serverchangingstate) - return FAILED; - - scsicmd_id = add_scsipending_entry(devdata, CMD_SCSITASKMGMT_TYPE, - NULL); - if (scsicmd_id < 0) - return FAILED; - - cmdrsp = get_scsipending_cmdrsp(devdata, scsicmd_id); - - init_waitqueue_head(¬ifyevent); - - /* issue TASK_MGMT_ABORT_TASK */ - cmdrsp->cmdtype = CMD_SCSITASKMGMT_TYPE; - - ret = setup_scsitaskmgmt_handles(&devdata->xa, cmdrsp, - ¬ifyevent, ¬ifyresult); - if (ret) { - dev_dbg(&scsidev->sdev_gendev, - "visorhba: setup_scsitaskmgmt_handles returned %d\n", ret); - return FAILED; - } - - /* 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.handle = scsicmd_id; - - dev_dbg(&scsidev->sdev_gendev, - "visorhba: initiating type=%d taskmgmt command\n", tasktype); - if (visorchannel_signalinsert(devdata->dev->visorchannel, - IOCHAN_TO_IOPART, - cmdrsp)) - goto err_del_scsipending_ent; - - /* It can take the Service Partition up to 35 seconds to complete - * an IO in some cases, so wait 45 seconds and error out - */ - if (!wait_event_timeout(notifyevent, notifyresult != 0xffff, - msecs_to_jiffies(45000))) - goto err_del_scsipending_ent; - - dev_dbg(&scsidev->sdev_gendev, - "visorhba: taskmgmt type=%d success; result=0x%x\n", - tasktype, notifyresult); - cleanup_scsitaskmgmt_handles(&devdata->xa, cmdrsp); - return SUCCESS; - -err_del_scsipending_ent: - dev_dbg(&scsidev->sdev_gendev, - "visorhba: taskmgmt type=%d not executed\n", tasktype); - del_scsipending_ent(devdata, scsicmd_id); - cleanup_scsitaskmgmt_handles(&devdata->xa, cmdrsp); - return FAILED; -} - -/* - * visorhba_abort_handler - Send TASK_MGMT_ABORT_TASK - * @scsicmd: The scsicmd that needs aborted - * - * Return: SUCCESS if inserted, FAILED otherwise - */ -static int visorhba_abort_handler(struct scsi_cmnd *scsicmd) -{ - /* issue TASK_MGMT_ABORT_TASK */ - struct scsi_device *scsidev; - struct visordisk_info *vdisk; - int rtn; - - scsidev = scsicmd->device; - vdisk = scsidev->hostdata; - if (atomic_read(&vdisk->error_count) < VISORHBA_ERROR_COUNT) - atomic_inc(&vdisk->error_count); - else - atomic_set(&vdisk->ios_threshold, IOS_ERROR_THRESHOLD); - rtn = forward_taskmgmt_command(TASK_MGMT_ABORT_TASK, scsidev); - if (rtn == SUCCESS) { - scsicmd->result = DID_ABORT << 16; - scsi_done(scsicmd); - } - return rtn; -} - -/* - * visorhba_device_reset_handler - Send TASK_MGMT_LUN_RESET - * @scsicmd: The scsicmd that needs aborted - * - * Return: SUCCESS if inserted, FAILED otherwise - */ -static int visorhba_device_reset_handler(struct scsi_cmnd *scsicmd) -{ - /* issue TASK_MGMT_LUN_RESET */ - struct scsi_device *scsidev; - struct visordisk_info *vdisk; - int rtn; - - scsidev = scsicmd->device; - vdisk = scsidev->hostdata; - if (atomic_read(&vdisk->error_count) < VISORHBA_ERROR_COUNT) - atomic_inc(&vdisk->error_count); - else - atomic_set(&vdisk->ios_threshold, IOS_ERROR_THRESHOLD); - rtn = forward_taskmgmt_command(TASK_MGMT_LUN_RESET, scsidev); - if (rtn == SUCCESS) { - scsicmd->result = DID_RESET << 16; - scsi_done(scsicmd); - } - return rtn; -} - -/* - * visorhba_bus_reset_handler - Send TASK_MGMT_TARGET_RESET for each - * target on the bus - * @scsicmd: The scsicmd that needs aborted - * - * Return: SUCCESS if inserted, FAILED otherwise - */ -static int visorhba_bus_reset_handler(struct scsi_cmnd *scsicmd) -{ - struct scsi_device *scsidev; - struct visordisk_info *vdisk; - int rtn; - - scsidev = scsicmd->device; - shost_for_each_device(scsidev, scsidev->host) { - vdisk = scsidev->hostdata; - if (atomic_read(&vdisk->error_count) < VISORHBA_ERROR_COUNT) - atomic_inc(&vdisk->error_count); - else - atomic_set(&vdisk->ios_threshold, IOS_ERROR_THRESHOLD); - } - rtn = forward_taskmgmt_command(TASK_MGMT_BUS_RESET, scsidev); - if (rtn == SUCCESS) { - scsicmd->result = DID_RESET << 16; - scsi_done(scsicmd); - } - return rtn; -} - -/* - * visorhba_host_reset_handler - Not supported - * @scsicmd: The scsicmd that needs to be aborted - * - * Return: Not supported, return SUCCESS - */ -static int visorhba_host_reset_handler(struct scsi_cmnd *scsicmd) -{ - /* issue TASK_MGMT_TARGET_RESET for each target on each bus for host */ - return SUCCESS; -} - -/* - * visorhba_get_info - Get information about SCSI device - * @shp: Scsi host that is requesting information - * - * Return: String with visorhba information - */ -static const char *visorhba_get_info(struct Scsi_Host *shp) -{ - /* Return version string */ - return "visorhba"; -} - -/* - * dma_data_dir_linux_to_spar - convert dma_data_direction value to - * Unisys-specific equivalent - * @d: dma direction value to convert - * - * Returns the Unisys-specific dma direction value corresponding to @d - */ -static u32 dma_data_dir_linux_to_spar(enum dma_data_direction d) -{ - switch (d) { - case DMA_BIDIRECTIONAL: - return UIS_DMA_BIDIRECTIONAL; - case DMA_TO_DEVICE: - return UIS_DMA_TO_DEVICE; - case DMA_FROM_DEVICE: - return UIS_DMA_FROM_DEVICE; - case DMA_NONE: - return UIS_DMA_NONE; - default: - return UIS_DMA_NONE; - } -} - -/* - * visorhba_queue_command_lck - Queues command to the Service Partition - * @scsicmd: Command to be queued - * @vsiorhba_cmnd_done: Done command to call when scsicmd is returned - * - * Queues to scsicmd to the ServicePartition after converting it to a - * uiscmdrsp structure. - * - * Return: 0 if successfully queued to the Service Partition, otherwise - * error code - */ -static int visorhba_queue_command_lck(struct scsi_cmnd *scsicmd) -{ - void (*visorhba_cmnd_done)(struct scsi_cmnd *) = scsi_done; - struct uiscmdrsp *cmdrsp; - struct scsi_device *scsidev = scsicmd->device; - int insert_location; - unsigned char *cdb = scsicmd->cmnd; - struct Scsi_Host *scsihost = scsidev->host; - unsigned int i; - struct visorhba_devdata *devdata = - (struct visorhba_devdata *)scsihost->hostdata; - struct scatterlist *sg = NULL; - struct scatterlist *sglist = NULL; - - if (devdata->serverdown || devdata->serverchangingstate) - return SCSI_MLQUEUE_DEVICE_BUSY; - - insert_location = add_scsipending_entry(devdata, CMD_SCSI_TYPE, - (void *)scsicmd); - if (insert_location < 0) - return SCSI_MLQUEUE_DEVICE_BUSY; - - cmdrsp = get_scsipending_cmdrsp(devdata, insert_location); - cmdrsp->cmdtype = CMD_SCSI_TYPE; - /* save the pending insertion location. Deletion from pending - * will return the scsicmd pointer for completion - */ - cmdrsp->scsi.handle = insert_location; - - WARN_ON_ONCE(visorhba_cmnd_done != scsi_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 = - dma_data_dir_linux_to_spar(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 > devdata->max_buff_len) - devdata->max_buff_len = cmdrsp->scsi.bufflen; - - if (scsi_sg_count(scsicmd) > MAX_PHYS_INFO) - goto err_del_scsipending_ent; - - /* convert buffer to phys information */ - /* buffer is scatterlist - copy it out */ - sglist = scsi_sglist(scsicmd); - - for_each_sg(sglist, sg, scsi_sg_count(scsicmd), i) { - cmdrsp->scsi.gpi_list[i].address = sg_phys(sg); - cmdrsp->scsi.gpi_list[i].length = sg->length; - } - cmdrsp->scsi.guest_phys_entries = scsi_sg_count(scsicmd); - - if (visorchannel_signalinsert(devdata->dev->visorchannel, - IOCHAN_TO_IOPART, - cmdrsp)) - /* queue must be full and we aren't going to wait */ - goto err_del_scsipending_ent; - - return 0; - -err_del_scsipending_ent: - del_scsipending_ent(devdata, insert_location); - return SCSI_MLQUEUE_DEVICE_BUSY; -} - -#ifdef DEF_SCSI_QCMD -static DEF_SCSI_QCMD(visorhba_queue_command) -#else -#define visorhba_queue_command visorhba_queue_command_lck -#endif - -/* - * visorhba_slave_alloc - Called when new disk is discovered - * @scsidev: New disk - * - * Create a new visordisk_info structure and add it to our - * list of vdisks. - * - * Return: 0 on success, -ENOMEM on failure. - */ -static int visorhba_slave_alloc(struct scsi_device *scsidev) -{ - /* this is called by the midlayer before scan for new devices -- - * LLD can alloc any struct & do init if needed. - */ - struct visordisk_info *vdisk; - struct visorhba_devdata *devdata; - struct Scsi_Host *scsihost = (struct Scsi_Host *)scsidev->host; - - /* already allocated return success */ - if (scsidev->hostdata) - return 0; - - /* even though we errored, treat as success */ - devdata = (struct visorhba_devdata *)scsihost->hostdata; - if (!devdata) - return 0; - - vdisk = kzalloc(sizeof(*vdisk), GFP_ATOMIC); - if (!vdisk) - return -ENOMEM; - - vdisk->sdev = scsidev; - scsidev->hostdata = vdisk; - return 0; -} - -/* - * visorhba_slave_destroy - Disk is going away, clean up resources. - * @scsidev: Scsi device to destroy - */ -static void visorhba_slave_destroy(struct scsi_device *scsidev) -{ - /* midlevel calls this after device has been quiesced and - * before it is to be deleted. - */ - struct visordisk_info *vdisk; - - vdisk = scsidev->hostdata; - scsidev->hostdata = NULL; - kfree(vdisk); -} - -static struct scsi_host_template visorhba_driver_template = { - .name = "Unisys Visor HBA", - .info = visorhba_get_info, - .queuecommand = visorhba_queue_command, - .eh_abort_handler = visorhba_abort_handler, - .eh_device_reset_handler = visorhba_device_reset_handler, - .eh_bus_reset_handler = visorhba_bus_reset_handler, - .eh_host_reset_handler = visorhba_host_reset_handler, -#define visorhba_MAX_CMNDS 128 - .can_queue = visorhba_MAX_CMNDS, - .sg_tablesize = 64, - .this_id = -1, - .slave_alloc = visorhba_slave_alloc, - .slave_destroy = visorhba_slave_destroy, -}; - -/* - * info_debugfs_show - Debugfs interface to dump visorhba states - * @seq: The sequence file to write information to - * @v: Unused, but needed for use with seq file single_open invocation - * - * Presents a file in the debugfs tree named: /visorhba/vbus<x>:dev<y>/info. - * - * Return: SUCCESS - */ -static int info_debugfs_show(struct seq_file *seq, void *v) -{ - struct visorhba_devdata *devdata = seq->private; - - seq_printf(seq, "max_buff_len = %u\n", devdata->max_buff_len); - seq_printf(seq, "interrupts_rcvd = %llu\n", devdata->interrupts_rcvd); - seq_printf(seq, "interrupts_disabled = %llu\n", - devdata->interrupts_disabled); - seq_printf(seq, "interrupts_notme = %llu\n", - devdata->interrupts_notme); - seq_printf(seq, "flags_addr = %p\n", devdata->flags_addr); - if (devdata->flags_addr) { - u64 phys_flags_addr = - virt_to_phys((__force void *)devdata->flags_addr); - seq_printf(seq, "phys_flags_addr = 0x%016llx\n", - phys_flags_addr); - seq_printf(seq, "FeatureFlags = %llu\n", - (u64)readq(devdata->flags_addr)); - } - seq_printf(seq, "acquire_failed_cnt = %llu\n", - devdata->acquire_failed_cnt); - - return 0; -} -DEFINE_SHOW_ATTRIBUTE(info_debugfs); - -/* - * complete_taskmgmt_command - Complete task management - * @idrtable: The data object maintaining the pointer<-->int mappings - * @cmdrsp: Response from the IOVM - * @result: The result of the task management command - * - * Service Partition returned the result of the task management - * command. Wake up anyone waiting for it. - */ -static void complete_taskmgmt_command(struct xarray *xa, - struct uiscmdrsp *cmdrsp, int result) -{ - wait_queue_head_t *wq = - xa_load(xa, cmdrsp->scsitaskmgmt.notify_handle); - int *scsi_result_ptr = - xa_load(xa, cmdrsp->scsitaskmgmt.notifyresult_handle); - if (unlikely(!(wq && scsi_result_ptr))) { - pr_err("visorhba: no completion context; cmd will time out\n"); - return; - } - - /* copy the result of the taskmgmt and - * wake up the error handler that is waiting for this - */ - pr_debug("visorhba: notifying initiator with result=0x%x\n", result); - *scsi_result_ptr = result; - wake_up_all(wq); -} - -/* - * visorhba_serverdown_complete - Called when we are done cleaning up - * from serverdown - * @devdata: Visorhba instance on which to complete serverdown - * - * Called when we are done cleanning up from serverdown, stop processing - * queue, fail pending IOs. - */ -static void visorhba_serverdown_complete(struct visorhba_devdata *devdata) -{ - int i; - struct scsipending *pendingdel = NULL; - struct scsi_cmnd *scsicmd = NULL; - struct uiscmdrsp *cmdrsp; - unsigned long flags; - - /* Stop using the IOVM response queue (queue should be drained - * by the end) - */ - visorbus_disable_channel_interrupts(devdata->dev); - - /* Fail commands that weren't completed */ - spin_lock_irqsave(&devdata->privlock, flags); - for (i = 0; i < MAX_PENDING_REQUESTS; i++) { - pendingdel = &devdata->pending[i]; - switch (pendingdel->cmdtype) { - case CMD_SCSI_TYPE: - scsicmd = pendingdel->sent; - scsicmd->result = DID_RESET << 16; - scsi_done(scsicmd); - break; - case CMD_SCSITASKMGMT_TYPE: - cmdrsp = pendingdel->sent; - complete_taskmgmt_command(&devdata->xa, cmdrsp, - TASK_MGMT_FAILED); - break; - default: - break; - } - pendingdel->cmdtype = 0; - pendingdel->sent = NULL; - } - spin_unlock_irqrestore(&devdata->privlock, flags); - - devdata->serverdown = true; - devdata->serverchangingstate = false; -} - -/* - * visorhba_serverdown - Got notified that the IOVM is down - * @devdata: Visorhba that is being serviced by downed IOVM - * - * Something happened to the IOVM, return immediately and - * schedule cleanup work. - * - * Return: 0 on success, -EINVAL on failure - */ -static int visorhba_serverdown(struct visorhba_devdata *devdata) -{ - if (!devdata->serverdown && !devdata->serverchangingstate) { - devdata->serverchangingstate = true; - visorhba_serverdown_complete(devdata); - } else if (devdata->serverchangingstate) { - return -EINVAL; - } - return 0; -} - -/* - * do_scsi_linuxstat - Scsi command returned linuxstat - * @cmdrsp: Response from IOVM - * @scsicmd: Command issued - * - * Don't log errors for disk-not-present inquiries. - */ -static void do_scsi_linuxstat(struct uiscmdrsp *cmdrsp, - struct scsi_cmnd *scsicmd) -{ - struct visordisk_info *vdisk; - struct scsi_device *scsidev; - - scsidev = scsicmd->device; - memcpy(scsicmd->sense_buffer, cmdrsp->scsi.sensebuf, MAX_SENSE_SIZE); - - /* 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.... */ - vdisk = scsidev->hostdata; - if (atomic_read(&vdisk->error_count) < VISORHBA_ERROR_COUNT) { - atomic_inc(&vdisk->error_count); - atomic_set(&vdisk->ios_threshold, IOS_ERROR_THRESHOLD); - } -} - -static int set_no_disk_inquiry_result(unsigned char *buf, size_t len, - bool is_lun0) -{ - if (len < NO_DISK_INQUIRY_RESULT_LEN) - return -EINVAL; - memset(buf, 0, NO_DISK_INQUIRY_RESULT_LEN); - buf[2] = SCSI_SPC2_VER; - if (is_lun0) { - buf[0] = DEV_DISK_CAPABLE_NOT_PRESENT; - buf[3] = DEV_HISUPPORT; - } else { - buf[0] = DEV_NOT_CAPABLE; - } - buf[4] = NO_DISK_INQUIRY_RESULT_LEN - 5; - strncpy(buf + 8, "DELLPSEUDO DEVICE .", NO_DISK_INQUIRY_RESULT_LEN - 8); - return 0; -} - -/* - * do_scsi_nolinuxstat - Scsi command didn't have linuxstat - * @cmdrsp: Response from IOVM - * @scsicmd: Command issued - * - * Handle response when no linuxstat was returned. - */ -static void do_scsi_nolinuxstat(struct uiscmdrsp *cmdrsp, - struct scsi_cmnd *scsicmd) -{ - struct scsi_device *scsidev; - unsigned char *buf; - struct scatterlist *sg; - unsigned int i; - char *this_page; - char *this_page_orig; - int bufind = 0; - struct visordisk_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; - - buf = kzalloc(36, GFP_KERNEL); - if (!buf) - return; - - /* Linux scsi code 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, (size_t)cmdrsp->scsi.bufflen, - scsidev->lun == 0); - - if (scsi_sg_count(scsicmd) == 0) { - memcpy(scsi_sglist(scsicmd), buf, - cmdrsp->scsi.bufflen); - kfree(buf); - return; - } - - scsi_for_each_sg(scsicmd, sg, scsi_sg_count(scsicmd), i) { - this_page_orig = kmap_atomic(sg_page(sg)); - this_page = (void *)((unsigned long)this_page_orig | - sg->offset); - memcpy(this_page, buf + bufind, sg->length); - kunmap_atomic(this_page_orig); - } - kfree(buf); - } else { - vdisk = scsidev->hostdata; - 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); - } - } -} - -/* - * complete_scsi_command - Complete a scsi command - * @uiscmdrsp: Response from Service Partition - * @scsicmd: The scsi command - * - * Response was returned by the Service Partition. Finish it and send - * completion to the scsi midlayer. - */ -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); - - scsi_done(scsicmd); -} - -/* - * drain_queue - Pull responses out of iochannel - * @cmdrsp: Response from the IOSP - * @devdata: Device that owns this iochannel - * - * Pulls responses out of the iochannel and process the responses. - */ -static void drain_queue(struct uiscmdrsp *cmdrsp, - struct visorhba_devdata *devdata) -{ - struct scsi_cmnd *scsicmd; - - while (1) { - /* queue empty */ - if (visorchannel_signalremove(devdata->dev->visorchannel, - IOCHAN_FROM_IOPART, - cmdrsp)) - break; - if (cmdrsp->cmdtype == CMD_SCSI_TYPE) { - /* scsicmd location is returned by the - * deletion - */ - scsicmd = del_scsipending_ent(devdata, - cmdrsp->scsi.handle); - if (!scsicmd) - break; - /* complete the orig cmd */ - complete_scsi_command(cmdrsp, scsicmd); - } else if (cmdrsp->cmdtype == CMD_SCSITASKMGMT_TYPE) { - if (!del_scsipending_ent(devdata, - cmdrsp->scsitaskmgmt.handle)) - break; - complete_taskmgmt_command(&devdata->xa, cmdrsp, - cmdrsp->scsitaskmgmt.result); - } else if (cmdrsp->cmdtype == CMD_NOTIFYGUEST_TYPE) - dev_err_once(&devdata->dev->device, - "ignoring unsupported NOTIFYGUEST\n"); - /* cmdrsp is now available for re-use */ - } -} - -/* - * This is used only when this driver is active as an hba driver in the - * client guest partition. It is called periodically so we can obtain - * and process the command respond from the IO Service Partition periodically. - */ -static void visorhba_channel_interrupt(struct visor_device *dev) -{ - struct visorhba_devdata *devdata = dev_get_drvdata(&dev->device); - - if (!devdata) - return; - - drain_queue(devdata->cmdrsp, devdata); -} - -/* - * visorhba_pause - Function to handle visorbus pause messages - * @dev: Device that is pausing - * @complete_func: Function to call when finished - * - * Something has happened to the IO Service Partition that is - * handling this device. Quiet this device and reset commands - * so that the Service Partition can be corrected. - * - * Return: SUCCESS - */ -static int visorhba_pause(struct visor_device *dev, - visorbus_state_complete_func complete_func) -{ - struct visorhba_devdata *devdata = dev_get_drvdata(&dev->device); - - visorhba_serverdown(devdata); - complete_func(dev, 0); - return 0; -} - -/* - * visorhba_resume - Function called when the IO Service Partition is back - * @dev: Device that is pausing - * @complete_func: Function to call when finished - * - * Yay! The IO Service Partition is back, the channel has been wiped - * so lets re-establish connection and start processing responses. - * - * Return: 0 on success, -EINVAL on failure - */ -static int visorhba_resume(struct visor_device *dev, - visorbus_state_complete_func complete_func) -{ - struct visorhba_devdata *devdata; - - devdata = dev_get_drvdata(&dev->device); - if (!devdata) - return -EINVAL; - - if (devdata->serverdown && !devdata->serverchangingstate) - devdata->serverchangingstate = true; - - visorbus_enable_channel_interrupts(dev); - devdata->serverdown = false; - devdata->serverchangingstate = false; - - return 0; -} - -/* - * visorhba_probe - Device has been discovered; do acquire - * @dev: visor_device that was discovered - * - * A new HBA was discovered; do the initial connections of it. - * - * Return: 0 on success, otherwise error code - */ -static int visorhba_probe(struct visor_device *dev) -{ - struct Scsi_Host *scsihost; - struct vhba_config_max max; - struct visorhba_devdata *devdata = NULL; - int err, channel_offset; - u64 features; - - scsihost = scsi_host_alloc(&visorhba_driver_template, - sizeof(*devdata)); - if (!scsihost) - return -ENODEV; - - channel_offset = offsetof(struct visor_io_channel, vhba.max); - err = visorbus_read_channel(dev, channel_offset, &max, - sizeof(struct vhba_config_max)); - if (err < 0) - goto err_scsi_host_put; - - scsihost->max_id = (unsigned int)max.max_id; - scsihost->max_lun = (unsigned int)max.max_lun; - scsihost->cmd_per_lun = (unsigned int)max.cmd_per_lun; - scsihost->max_sectors = - (unsigned short)(max.max_io_size >> 9); - scsihost->sg_tablesize = - (unsigned short)(max.max_io_size / PAGE_SIZE); - if (scsihost->sg_tablesize > MAX_PHYS_INFO) - scsihost->sg_tablesize = MAX_PHYS_INFO; - err = scsi_add_host(scsihost, &dev->device); - if (err < 0) - goto err_scsi_host_put; - - devdata = (struct visorhba_devdata *)scsihost->hostdata; - devdata->dev = dev; - dev_set_drvdata(&dev->device, devdata); - - devdata->debugfs_dir = debugfs_create_dir(dev_name(&dev->device), - visorhba_debugfs_dir); - if (!devdata->debugfs_dir) { - err = -ENOMEM; - goto err_scsi_remove_host; - } - devdata->debugfs_info = - debugfs_create_file("info", 0440, - devdata->debugfs_dir, devdata, - &info_debugfs_fops); - if (!devdata->debugfs_info) { - err = -ENOMEM; - goto err_debugfs_dir; - } - - spin_lock_init(&devdata->privlock); - devdata->serverdown = false; - devdata->serverchangingstate = false; - devdata->scsihost = scsihost; - - channel_offset = offsetof(struct visor_io_channel, - channel_header.features); - err = visorbus_read_channel(dev, channel_offset, &features, 8); - if (err) - goto err_debugfs_info; - features |= VISOR_CHANNEL_IS_POLLING; - err = visorbus_write_channel(dev, channel_offset, &features, 8); - if (err) - goto err_debugfs_info; - - xa_init(&devdata->xa); - - devdata->cmdrsp = kmalloc(sizeof(*devdata->cmdrsp), GFP_ATOMIC); - visorbus_enable_channel_interrupts(dev); - - scsi_scan_host(scsihost); - - return 0; - -err_debugfs_info: - debugfs_remove(devdata->debugfs_info); - -err_debugfs_dir: - debugfs_remove_recursive(devdata->debugfs_dir); - -err_scsi_remove_host: - scsi_remove_host(scsihost); - -err_scsi_host_put: - scsi_host_put(scsihost); - return err; -} - -/* - * visorhba_remove - Remove a visorhba device - * @dev: Device to remove - * - * Removes the visorhba device. - */ -static void visorhba_remove(struct visor_device *dev) -{ - struct visorhba_devdata *devdata = dev_get_drvdata(&dev->device); - struct Scsi_Host *scsihost = NULL; - - if (!devdata) - return; - - scsihost = devdata->scsihost; - kfree(devdata->cmdrsp); - visorbus_disable_channel_interrupts(dev); - scsi_remove_host(scsihost); - scsi_host_put(scsihost); - - dev_set_drvdata(&dev->device, NULL); - debugfs_remove(devdata->debugfs_info); - debugfs_remove_recursive(devdata->debugfs_dir); -} - -/* This is used to tell the visorbus driver which types of visor devices - * we support, and what functions to call when a visor device that we support - * is attached or removed. - */ -static struct visor_driver visorhba_driver = { - .name = "visorhba", - .owner = THIS_MODULE, - .channel_types = visorhba_channel_types, - .probe = visorhba_probe, - .remove = visorhba_remove, - .pause = visorhba_pause, - .resume = visorhba_resume, - .channel_interrupt = visorhba_channel_interrupt, -}; - -/* - * visorhba_init - Driver init routine - * - * Initialize the visorhba driver and register it with visorbus - * to handle s-Par virtual host bus adapter. - * - * Return: 0 on success, error code otherwise - */ -static int visorhba_init(void) -{ - int rc; - - visorhba_debugfs_dir = debugfs_create_dir("visorhba", NULL); - if (!visorhba_debugfs_dir) - return -ENOMEM; - - rc = visorbus_register_visor_driver(&visorhba_driver); - if (rc) - goto cleanup_debugfs; - - return 0; - -cleanup_debugfs: - debugfs_remove_recursive(visorhba_debugfs_dir); - - return rc; -} - -/* - * visorhba_exit - Driver exit routine - * - * Unregister driver from the bus and free up memory. - */ -static void visorhba_exit(void) -{ - visorbus_unregister_visor_driver(&visorhba_driver); - debugfs_remove_recursive(visorhba_debugfs_dir); -} - -module_init(visorhba_init); -module_exit(visorhba_exit); - -MODULE_AUTHOR("Unisys"); -MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("s-Par HBA driver for virtual SCSI host busses"); 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