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android / kernel / common / d6a9a74487e86b528c44965f871de75671b6adb0 / . / drivers / staging / unisys / virthba / virthba.c
blob: 938e2c82c1aba21ff8d1d283dbe8e062fdfceaf6 [file] [log] [blame]
/* 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 */
#undef DBGINF
#include <linux/kernel.h>
#ifdef CONFIG_MODVERSIONS
#include <config/modversions.h>
#endif
#include "uniklog.h"
#include "diagnostics/appos_subsystems.h"
#include "uisutils.h"
#include "uisqueue.h"
#include "uisthread.h"
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <asm/param.h>
#include <linux/debugfs.h>
#include <linux/types.h>
#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 doDiskAddRemove(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 MaxBuffLen;
/* 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 InterruptInfo 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 DARWorkQ */
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 VirtHbasOpen[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 != NULL) {
insert_location = (insert_location + 1) % MAX_PENDING_REQUESTS;
if (insert_location == (int) vhbainfo->nextinsert) {
LOGERR("Queue should be full. insert_location<<%d>> Unable to find open slot for pending commands.\n",
insert_location);
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) {
LOGERR("Failed to find empty queue slot. Waiting to try again\n");
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) {
LOGERR("Invalid queue position <<%lu>> given to delete. MAX_PENDING_REQUESTS <<%d>>\n",
(unsigned long) del, MAX_PENDING_REQUESTS);
} else {
spin_lock_irqsave(&vhbainfo->privlock, flags);
if (vhbainfo->pending[del].sent == NULL)
LOGERR("Deleting already cleared queue entry at <<%lu>>.\n",
(unsigned long) del);
sent = vhbainfo->pending[del].sent;
vhbainfo->pending[del].cmdtype = 0;
vhbainfo->pending[del].sent = NULL;
spin_unlock_irqrestore(&vhbainfo->privlock, flags);
}
return sent;
}
/* DARWorkQ (Disk Add/Remove) */
static struct work_struct DARWorkQ;
static struct diskaddremove *DARWorkQHead;
static spinlock_t DARWorkQLock;
static unsigned short DARWorkQSched;
#define QUEUE_DISKADDREMOVE(dar) { \
spin_lock_irqsave(&DARWorkQLock, flags); \
if (!DARWorkQHead) { \
DARWorkQHead = dar; \
dar->next = NULL; \
} \
else { \
dar->next = DARWorkQHead; \
DARWorkQHead = dar; \
} \
if (!DARWorkQSched) { \
schedule_work(&DARWorkQ); \
DARWorkQSched = 1; \
} \
spin_unlock_irqrestore(&DARWorkQLock, flags); \
}
static inline void
SendDiskAddRemove(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);
if (error)
LOGERR("Failed scsi_add_device: host_no=%d[chan=%d:id=%d:lun=%d]\n",
dar->shost->host_no, dar->channel, dar->id,
dar->lun);
} else
LOGERR("Failed scsi_device_lookup:[chan=%d:id=%d:lun=%d]\n",
dar->channel, dar->id, dar->lun);
kfree(dar);
}
/*****************************************************/
/* DARWorkQ Handler Thread */
/*****************************************************/
static void
doDiskAddRemove(struct work_struct *work)
{
struct diskaddremove *dar;
struct diskaddremove *tmphead;
int i = 0;
unsigned long flags;
spin_lock_irqsave(&DARWorkQLock, flags);
tmphead = DARWorkQHead;
DARWorkQHead = NULL;
DARWorkQSched = 0;
spin_unlock_irqrestore(&DARWorkQLock, flags);
while (tmphead) {
dar = tmphead;
tmphead = dar->next;
SendDiskAddRemove(dar);
i++;
}
}
/*****************************************************/
/* Routine to add entry to DARWorkQ */
/*****************************************************/
static void
process_disk_notify(struct Scsi_Host *shost, struct uiscmdrsp *cmdrsp)
{
struct diskaddremove *dar;
unsigned long flags;
dar = kzalloc(sizeof(struct diskaddremove), 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);
} else {
LOGERR("kmalloc failed for dar. host_no=%d[chan=%d:id=%d:lun=%d]\n",
shost->host_no, cmdrsp->disknotify.channel,
cmdrsp->disknotify.id, cmdrsp->disknotify.lun);
}
}
/*****************************************************/
/* Probe Remove Functions */
/*****************************************************/
static irqreturn_t
virthba_ISR(int irq, void *dev_id)
{
struct virthba_info *virthbainfo = (struct virthba_info *) dev_id;
CHANNEL_HEADER __iomem *pChannelHeader;
SIGNAL_QUEUE_HEADER __iomem *pqhdr;
u64 mask;
unsigned long long rc1;
if (virthbainfo == NULL)
return IRQ_NONE;
virthbainfo->interrupts_rcvd++;
pChannelHeader = virthbainfo->chinfo.queueinfo->chan;
if (((readq(&pChannelHeader->Features)
& ULTRA_IO_IOVM_IS_OK_WITH_DRIVER_DISABLING_INTS) != 0)
&& ((readq(&pChannelHeader->Features) &
ULTRA_IO_DRIVER_DISABLES_INTS) !=
0)) {
virthbainfo->interrupts_disabled++;
mask = ~ULTRA_CHANNEL_ENABLE_INTS;
rc1 = uisqueue_interlocked_and(virthbainfo->flags_addr, mask);
}
if (visor_signalqueue_empty(pChannelHeader, IOCHAN_FROM_IOPART)) {
virthbainfo->interrupts_notme++;
return IRQ_NONE;
}
pqhdr = (SIGNAL_QUEUE_HEADER __iomem *)
((char __iomem *) pChannelHeader +
readq(&pChannelHeader->oChannelSpace)) + IOCHAN_FROM_IOPART;
writeq(readq(&pqhdr->NumInterruptsReceived) + 1,
&pqhdr->NumInterruptsReceived);
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;
CHANNEL_HEADER __iomem *pChannelHeader;
SIGNAL_QUEUE_HEADER __iomem *pqhdr;
u64 mask;
LOGVER("entering virthba_probe...\n");
LOGVER("virtpcidev busNo<<%d>>devNo<<%d>>", virtpcidev->busNo,
virtpcidev->deviceNo);
LOGINF("entering virthba_probe...\n");
LOGINF("virtpcidev busNo<<%d>>devNo<<%d>>", virtpcidev->busNo,
virtpcidev->deviceNo);
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
* initializatoin. The host is not published to the scsi
* midlayer until scsi_add_host is called.
*/
DBGINF("calling scsi_host_alloc.\n");
/* 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 == NULL)
return -ENODEV;
DBGINF("scsihost: 0x%p, scsihost->this_id: %d, host_no: %d.\n",
scsihost, scsihost->this_id, scsihost->host_no);
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.
*/
LOGINF("virtpcidev->scsi.max.max_channel=%u, max_id=%u, max_lun=%u, cmd_per_lun=%u, max_io_size=%u\n",
(unsigned) virtpcidev->scsi.max.max_channel - 1,
(unsigned) virtpcidev->scsi.max.max_id,
(unsigned) virtpcidev->scsi.max.max_lun,
(unsigned) virtpcidev->scsi.max.cmd_per_lun,
(unsigned) virtpcidev->scsi.max.max_io_size);
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;
LOGINF("scsihost->max_channel=%u, max_id=%u, max_lun=%llu, cmd_per_lun=%u, max_sectors=%hu, sg_tablesize=%hu\n",
scsihost->max_channel, scsihost->max_id, scsihost->max_lun,
scsihost->cmd_per_lun, scsihost->max_sectors,
scsihost->sg_tablesize);
LOGINF("scsihost->can_queue=%u, scsihost->cmd_per_lun=%u, max_sectors=%hu, sg_tablesize=%hu\n",
scsihost->can_queue, scsihost->cmd_per_lun, scsihost->max_sectors,
scsihost->sg_tablesize);
DBGINF("calling scsi_add_host\n");
/* 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/<path>/host? is created and
* host? points to that device instead.
*/
error = scsi_add_host(scsihost, &virtpcidev->generic_dev);
if (error) {
LOGERR("scsi_add_host ****FAILED 0x%x TBD - RECOVER\n", 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 (VirtHbasOpen[i].virthbainfo == NULL) {
VirtHbasOpen[i].virthbainfo = virthbainfo;
break;
}
}
virthbainfo->interrupt_vector = -1;
virthbainfo->chinfo.queueinfo = &virtpcidev->queueinfo;
virthbainfo->virtpcidev = virtpcidev;
spin_lock_init(&virthbainfo->chinfo.insertlock);
DBGINF("generic_dev: 0x%p, queueinfo: 0x%p.\n",
&virtpcidev->generic_dev, &virtpcidev->queueinfo);
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 */
DBGINF("starting rsp thread -- queueinfo: 0x%p, threadinfo: 0x%p.\n",
virthbainfo->chinfo.queueinfo, &virthbainfo->chinfo.threadinfo);
pChannelHeader = virthbainfo->chinfo.queueinfo->chan;
pqhdr = (SIGNAL_QUEUE_HEADER __iomem *)
((char __iomem *)pChannelHeader +
readq(&pChannelHeader->oChannelSpace)) + IOCHAN_FROM_IOPART;
virthbainfo->flags_addr = &pqhdr->FeatureFlags;
if (!uisthread_start(&virthbainfo->chinfo.threadinfo,
process_incoming_rsps,
virthbainfo, "vhba_incoming")) {
LOGERR("uisthread_start rsp ****FAILED\n");
/* 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;
}
LOGINF("sendInterruptHandle=0x%16llX",
virthbainfo->intr.sendInterruptHandle);
LOGINF("recvInterruptHandle=0x%16llX",
virthbainfo->intr.recvInterruptHandle);
LOGINF("recvInterruptVector=0x%8X",
virthbainfo->intr.recvInterruptVector);
LOGINF("recvInterruptShared=0x%2X",
virthbainfo->intr.recvInterruptShared);
LOGINF("scsihost.hostt->name=%s", scsihost->hostt->name);
virthbainfo->interrupt_vector =
virthbainfo->intr.recvInterruptHandle & INTERRUPT_VECTOR_MASK;
rsp = request_irq(virthbainfo->interrupt_vector, handler, IRQF_SHARED,
scsihost->hostt->name, virthbainfo);
if (rsp != 0) {
LOGERR("request_irq(%d) uislib_virthba_ISR request failed with rsp=%d\n",
virthbainfo->interrupt_vector, rsp);
virthbainfo->interrupt_vector = -1;
POSTCODE_LINUX_2(VHBA_PROBE_FAILURE_PC, POSTCODE_SEVERITY_ERR);
} else {
u64 __iomem *Features_addr =
&virthbainfo->chinfo.queueinfo->chan->Features;
LOGERR("request_irq(%d) uislib_virthba_ISR request succeeded\n",
virthbainfo->interrupt_vector);
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;
}
DBGINF("calling scsi_scan_host.\n");
scsi_scan_host(scsihost);
DBGINF("return from scsi_scan_host.\n");
LOGINF("virthba added scsihost:0x%p\n", 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;
LOGINF("virtpcidev busNo<<%d>>devNo<<%d>>", virtpcidev->busNo,
virtpcidev->deviceNo);
virthbainfo = (struct virthba_info *) scsihost->hostdata;
if (virthbainfo->interrupt_vector != -1)
free_irq(virthbainfo->interrupt_vector, virthbainfo);
LOGINF("Removing virtpcidev: 0x%p, virthbainfo: 0x%p\n", virtpcidev,
virthbainfo);
DBGINF("removing scsihost: 0x%p, scsihost->this_id: %d\n", scsihost,
scsihost->this_id);
scsi_remove_host(scsihost);
DBGINF("stopping thread.\n");
uisthread_stop(&virthbainfo->chinfo.threadinfo);
DBGINF("calling scsi_host_put\n");
/* decr refcount on scsihost which was incremented by
* scsi_add_host so the scsi_host gets deleted
*/
scsi_host_put(scsihost);
LOGINF("virthba removed scsi_host.\n");
}
static int
forward_vdiskmgmt_command(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;
LOGINF("vDiskMgmt:%d %d:%d:%d\n", vdiskcmdtype,
vdest->channel, vdest->id, vdest->lun);
if (virthbainfo->serverdown || virthbainfo->serverchangingstate) {
DBGINF("Server is down/changing state. Returning Failure.\n");
return FAILED;
}
cmdrsp = kzalloc(SIZEOF_CMDRSP, GFP_ATOMIC);
if (cmdrsp == NULL) {
LOGERR("kmalloc of cmdrsp failed.\n");
return FAILED; /* reject */
}
init_waitqueue_head(&notifyevent);
/* 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 *) &notifyevent;
cmdrsp->vdiskmgmt.notifyresult = (void *) &notifyresult;
/* 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");
LOGINF("VdiskMgmt waiting on event notifyevent=0x%p\n",
cmdrsp->scsitaskmgmt.notify);
wait_event(notifyevent, notifyresult != 0xffff);
LOGINF("VdiskMgmt complete; result:%d\n", cmdrsp->vdiskmgmt.result);
kfree(cmdrsp);
return SUCCESS;
}
/*****************************************************/
/* Scsi Host support functions */
/*****************************************************/
static int
forward_taskmgmt_command(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;
LOGINF("TaskMgmt:%d %d:%d:%llu\n", tasktype,
scsidev->channel, scsidev->id, scsidev->lun);
if (virthbainfo->serverdown || virthbainfo->serverchangingstate) {
DBGINF("Server is down/changing state. Returning Failure.\n");
return FAILED;
}
cmdrsp = kzalloc(SIZEOF_CMDRSP, GFP_ATOMIC);
if (cmdrsp == NULL) {
LOGERR("kmalloc of cmdrsp failed.\n");
return FAILED; /* reject */
}
init_waitqueue_head(&notifyevent);
/* 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 *) &notifyevent;
cmdrsp->scsitaskmgmt.notifyresult = (void *) &notifyresult;
/* 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");
LOGINF("TaskMgmt waiting on event notifyevent=0x%p\n",
cmdrsp->scsitaskmgmt.notify);
wait_event(notifyevent, notifyresult != 0xffff);
LOGINF("TaskMgmt complete; result:%d\n", cmdrsp->scsitaskmgmt.result);
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 */
LOGERR("virthba_host_reset_handler Not yet implemented\n");
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)
{
DBGINF("In virthba_ioctl: ioctl: cmd=0x%x\n", cmd);
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) {
DBGINF("Server is down/changing state. Returning SCSI_MLQUEUE_DEVICE_BUSY.\n");
return SCSI_MLQUEUE_DEVICE_BUSY;
}
cmdrsp = kzalloc(SIZEOF_CMDRSP, GFP_ATOMIC);
if (cmdrsp == NULL) {
LOGERR("kmalloc of cmdrsp failed.\n");
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 {
LOGERR("Queue is full. Returning busy.\n");
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 > MaxBuffLen)
MaxBuffLen = cmdrsp->scsi.bufflen;
if (scsi_sg_count(scsicmd) > MAX_PHYS_INFO) {
LOGERR("scsicmd use_sg:%d greater than MAX:%d\n",
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) {
LOGERR("**** FAILED No scatter list for bufflen > 0\n");
BUG_ON(scsi_sg_count(scsicmd) == 0);
}
DBGINF("No sg; buffer:0x%p bufflen:%d\n",
scsi_sglist(scsicmd), scsi_bufflen(scsicmd));
} 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 ((i != 0) && (sg->offset != 0))
LOGINF("Offset on a sg_entry other than zero =<<%d>>.\n",
sg->offset);
}
if (sg_failed) {
LOGERR("Start sg_list dump (entries %d, bufflen %d)...\n",
scsi_sg_count(scsicmd), cmdrsp->scsi.bufflen);
for_each_sg(sgl, sg, scsi_sg_count(scsicmd), i) {
LOGERR(" Entry(%d): page->[0x%p], phys->[0x%Lx], off(%d), len(%d)\n",
i, sg_page(sg),
(unsigned long long) sg_phys(sg),
sg->offset, sg->length);
}
LOGERR("Done sg_list dump.\n");
/* 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 */
LOGERR("uisqueue_put_cmdrsp_with_lock ****FAILED\n");
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) {
LOGERR("Could not find virthba_info for scsihost\n");
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(struct virtdisk_info), GFP_ATOMIC);
if (!tmpvdisk) { /* error allocating */
LOGERR("Could not allocate memory for disk\n");
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;
if (!virthbainfo)
LOGERR("Could not find virthba_info for scsihost\n");
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);
LOGERR("SCSICMD ****FAILED scsicmd:0x%p op:0x%x <%d:%d:%d:%llu> 0x%x-0x%x-0x%x-0x%x-0x%x.\n",
scsicmd, cmdrsp->scsi.cmnd[0],
scsidev->host->host_no, scsidev->id,
scsidev->channel, scsidev->lun,
cmdrsp->scsi.linuxstat, sd->Valid, sd->SenseKey,
sd->AdditionalSenseCode,
sd->AdditionalSenseCodeQualifier);
if (atomic_read(&vdisk->error_count) ==
VIRTHBA_ERROR_COUNT) {
LOGERR("Throtling SCSICMD errors disk <%d:%d:%d:%llu>\n",
scsidev->host->host_no, scsidev->id,
scsidev->channel, scsidev->lun);
}
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) {
LOGERR("**** FAILED No scatter list for bufflen > 0\n");
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++) {
DBGVER("copying OUT OF buf into 0x%p %d\n",
sg_page(sg + i), sg[i].length);
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) {
LOGERR("Resetting error count for disk\n");
atomic_set(&vdisk->error_count, 0);
}
}
}
}
}
static void
complete_scsi_command(struct uiscmdrsp *cmdrsp, struct scsi_cmnd *scsicmd)
{
DBGINF("cmdrsp: 0x%p, scsistat:0x%x.\n", cmdrsp, cmdrsp->scsi.scsistat);
/* 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) {
DBGVER("Scsi_DONE\n");
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);
LOGINF("set notify result to %d\n", cmdrsp->vdiskmgmt.result);
}
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);
LOGINF("set notify result to %d\n", cmdrsp->scsitaskmgmt.result);
}
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 (!ULTRA_CHANNEL_CLIENT_ACQUIRE_OS(dc->queueinfo->chan,
"vhba", NULL)) {
spin_unlock_irqrestore(&virthbainfo->chinfo.insertlock,
flags);
virthbainfo->acquire_failed_cnt++;
break;
}
qrslt = uisqueue_get_cmdrsp(dc->queueinfo, cmdrsp,
IOCHAN_FROM_IOPART);
ULTRA_CHANNEL_CLIENT_RELEASE_OS(dc->queueinfo->chan,
"vhba", NULL);
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.vHba = 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);
} else
LOGERR("Invalid cmdtype %d\n", cmdrsp->cmdtype);
/* 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 == NULL) {
LOGERR("process_incoming_rsps ****FAILED to malloc - thread exiting\n");
complete_and_exit(&dc->threadinfo.has_stopped, 0);
return 0;
}
mask = ULTRA_CHANNEL_ENABLE_INTS;
while (1) {
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);
if (dc->threadinfo.should_stop)
break;
}
kfree(cmdrsp);
DBGINF("exiting processing incoming rsps.\n");
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 (VirtHbasOpen[i].virthbainfo == NULL)
continue;
virthbainfo = VirtHbasOpen[i].virthbainfo;
str_pos += scnprintf(vbuf + str_pos,
len - str_pos, "MaxBuffLen:%u\n", MaxBuffLen);
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)) {
LOGERR("copy_from_user failed. buf<<%.*s>> count<<%lu>>\n",
(int) count, buf, count);
return -EFAULT;
}
i = kstrtoint(buf, 10 , &new_value);
if (i != 0) {
LOGERR("Failed to scan value for enable_ints, buf<<%.*s>>",
(int) count, buf);
return -EFAULT;
}
/* set all counts to new_value usually 0 */
for (i = 0; i < VIRTHBASOPENMAX; i++) {
if (VirtHbasOpen[i].virthbainfo != NULL) {
virthbainfo = VirtHbasOpen[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;
DBGINF("virtpcidev busNo<<%d>>devNo<<%d>>", virtpcidev->busNo,
virtpcidev->deviceNo);
if (!virthbainfo->serverdown) {
DBGINF("Server up message received while server is already up.\n");
return 1;
}
if (virthbainfo->serverchangingstate) {
LOGERR("Server already processing change state message\n");
return 0;
}
virthbainfo->serverchangingstate = true;
/* Must transition channel to ATTACHED state BEFORE we
* can start using the device again
*/
ULTRA_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")) {
LOGERR("uisthread_start rsp ****FAILED\n");
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;
DBGINF("cmdrsp=0x%x, notify=0x%x\n", cmdrsp,
cmdrsp->scsitaskmgmt.notify);
*(int *) cmdrsp->scsitaskmgmt.notifyresult =
TASK_MGMT_FAILED;
wake_up_all((wait_queue_head_t *)
cmdrsp->scsitaskmgmt.notify);
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:
if (pendingdel->sent != NULL)
LOGERR("Unknown command type: 0x%x. Only freeing list structure.\n",
pendingdel->cmdtype);
}
pendingdel->cmdtype = 0;
pendingdel->sent = NULL;
}
spin_unlock_irqrestore(&virthbainfo->privlock, flags);
virtpcidev = virthbainfo->virtpcidev;
DBGINF("virtpcidev busNo<<%d>>devNo<<%d>>", virtpcidev->busNo,
virtpcidev->deviceNo);
virthbainfo->serverdown = true;
virthbainfo->serverchangingstate = false;
/* Return the ServerDown response to Command */
visorchipset_device_pause_response(virtpcidev->busNo,
virtpcidev->deviceNo, 0);
}
/* As per VirtpciFunc returns 1 for success and 0 for failure */
static int
virthba_serverdown(struct virtpci_dev *virtpcidev, u32 state)
{
struct virthba_info *virthbainfo =
(struct virthba_info *) ((struct Scsi_Host *) virtpcidev->scsi.
scsihost)->hostdata;
DBGINF("virthba_serverdown");
DBGINF("virtpcidev busNo<<%d>>devNo<<%d>>", virtpcidev->busNo,
virtpcidev->deviceNo);
if (!virthbainfo->serverdown && !virthbainfo->serverchangingstate) {
virthbainfo->serverchangingstate = true;
queue_work(virthba_serverdown_workqueue,
&virthbainfo->serverdown_completion);
} else if (virthbainfo->serverchangingstate) {
LOGERR("Server already processing change state message\n");
return 0;
} else
LOGERR("Server already down, but another server down message received.");
return 1;
}
/*****************************************************/
/* Module Init & Exit functions */
/*****************************************************/
static int __init
virthba_parse_line(char *str)
{
DBGINF("In virthba_parse_line %s\n", 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 == NULL || !*line)
return;
while ((line = next) != NULL) {
next = strchr(line, ' ');
if (next != NULL)
*next++ = 0;
if (!virthba_parse_line(line))
DBGINF("Unknown option '%s'\n", 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;
LOGINF("Entering virthba_mod_init...\n");
POSTCODE_LINUX_2(VHBA_CREATE_ENTRY_PC, POSTCODE_SEVERITY_INFO);
virthba_parse_options(virthba_options);
error = virtpci_register_driver(&virthba_driver);
if (error < 0) {
LOGERR("register ****FAILED 0x%x\n", error);
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 DARWorkQ */
INIT_WORK(&DARWorkQ, doDiskAddRemove);
spin_lock_init(&DARWorkQLock);
/* clear out array */
for (i = 0; i < VIRTHBASOPENMAX; i++)
VirtHbasOpen[i].virthbainfo = NULL;
/* Initialize the serverdown workqueue */
virthba_serverdown_workqueue =
create_singlethread_workqueue("virthba_serverdown");
if (virthba_serverdown_workqueue == NULL) {
LOGERR("**** FAILED virthba_serverdown_workqueue creation\n");
POSTCODE_LINUX_2(VHBA_CREATE_FAILURE_PC,
POSTCODE_SEVERITY_ERR);
error = -1;
}
}
POSTCODE_LINUX_2(VHBA_CREATE_EXIT_PC, POSTCODE_SEVERITY_INFO);
LOGINF("Leaving virthba_mod_init\n");
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)
{
LOGINF("entering virthba_mod_exit...\n");
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);
LOGINF("Leaving virthba_mod_exit\n");
}
/* 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);