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/*
* 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;
scsicmd->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;
scsicmd->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;
scsicmd->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 *))
{
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;
/* save done function that we have call when cmd is complete */
scsicmd->scsi_done = visorhba_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 =
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,
.shost_attrs = NULL,
#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;
if (scsicmd->scsi_done)
scsicmd->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);
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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