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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/drivers/char/viotape.c

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C
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/* -*- linux-c -*-
* drivers/char/viotape.c
*
* iSeries Virtual Tape
*
* Authors: Dave Boutcher <boutcher@us.ibm.com>
* Ryan Arnold <ryanarn@us.ibm.com>
* Colin Devilbiss <devilbis@us.ibm.com>
* Stephen Rothwell
*
* (C) Copyright 2000-2004 IBM Corporation
*
* 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) anyu 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. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* This routine provides access to tape drives owned and managed by an OS/400
* partition running on the same box as this Linux partition.
*
* All tape operations are performed by sending messages back and forth to
* the OS/400 partition. The format of the messages is defined in
* iseries/vio.h
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/spinlock.h>
#include <linux/mtio.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/major.h>
#include <linux/completion.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include <asm/ioctls.h>
#include <asm/firmware.h>
#include <asm/vio.h>
#include <asm/iseries/vio.h>
#include <asm/iseries/hv_lp_event.h>
#include <asm/iseries/hv_call_event.h>
#include <asm/iseries/hv_lp_config.h>
#define VIOTAPE_VERSION "1.2"
#define VIOTAPE_MAXREQ 1
#define VIOTAPE_KERN_WARN KERN_WARNING "viotape: "
#define VIOTAPE_KERN_INFO KERN_INFO "viotape: "
static int viotape_numdev;
/*
* The minor number follows the conventions of the SCSI tape drives. The
* rewind and mode are encoded in the minor #. We use this struct to break
* them out
*/
struct viot_devinfo_struct {
int devno;
int mode;
int rewind;
};
#define VIOTAPOP_RESET 0
#define VIOTAPOP_FSF 1
#define VIOTAPOP_BSF 2
#define VIOTAPOP_FSR 3
#define VIOTAPOP_BSR 4
#define VIOTAPOP_WEOF 5
#define VIOTAPOP_REW 6
#define VIOTAPOP_NOP 7
#define VIOTAPOP_EOM 8
#define VIOTAPOP_ERASE 9
#define VIOTAPOP_SETBLK 10
#define VIOTAPOP_SETDENSITY 11
#define VIOTAPOP_SETPOS 12
#define VIOTAPOP_GETPOS 13
#define VIOTAPOP_SETPART 14
#define VIOTAPOP_UNLOAD 15
enum viotaperc {
viotape_InvalidRange = 0x0601,
viotape_InvalidToken = 0x0602,
viotape_DMAError = 0x0603,
viotape_UseError = 0x0604,
viotape_ReleaseError = 0x0605,
viotape_InvalidTape = 0x0606,
viotape_InvalidOp = 0x0607,
viotape_TapeErr = 0x0608,
viotape_AllocTimedOut = 0x0640,
viotape_BOTEnc = 0x0641,
viotape_BlankTape = 0x0642,
viotape_BufferEmpty = 0x0643,
viotape_CleanCartFound = 0x0644,
viotape_CmdNotAllowed = 0x0645,
viotape_CmdNotSupported = 0x0646,
viotape_DataCheck = 0x0647,
viotape_DecompressErr = 0x0648,
viotape_DeviceTimeout = 0x0649,
viotape_DeviceUnavail = 0x064a,
viotape_DeviceBusy = 0x064b,
viotape_EndOfMedia = 0x064c,
viotape_EndOfTape = 0x064d,
viotape_EquipCheck = 0x064e,
viotape_InsufficientRs = 0x064f,
viotape_InvalidLogBlk = 0x0650,
viotape_LengthError = 0x0651,
viotape_LibDoorOpen = 0x0652,
viotape_LoadFailure = 0x0653,
viotape_NotCapable = 0x0654,
viotape_NotOperational = 0x0655,
viotape_NotReady = 0x0656,
viotape_OpCancelled = 0x0657,
viotape_PhyLinkErr = 0x0658,
viotape_RdyNotBOT = 0x0659,
viotape_TapeMark = 0x065a,
viotape_WriteProt = 0x065b
};
static const struct vio_error_entry viotape_err_table[] = {
{ viotape_InvalidRange, EIO, "Internal error" },
{ viotape_InvalidToken, EIO, "Internal error" },
{ viotape_DMAError, EIO, "DMA error" },
{ viotape_UseError, EIO, "Internal error" },
{ viotape_ReleaseError, EIO, "Internal error" },
{ viotape_InvalidTape, EIO, "Invalid tape device" },
{ viotape_InvalidOp, EIO, "Invalid operation" },
{ viotape_TapeErr, EIO, "Tape error" },
{ viotape_AllocTimedOut, EBUSY, "Allocate timed out" },
{ viotape_BOTEnc, EIO, "Beginning of tape encountered" },
{ viotape_BlankTape, EIO, "Blank tape" },
{ viotape_BufferEmpty, EIO, "Buffer empty" },
{ viotape_CleanCartFound, ENOMEDIUM, "Cleaning cartridge found" },
{ viotape_CmdNotAllowed, EIO, "Command not allowed" },
{ viotape_CmdNotSupported, EIO, "Command not supported" },
{ viotape_DataCheck, EIO, "Data check" },
{ viotape_DecompressErr, EIO, "Decompression error" },
{ viotape_DeviceTimeout, EBUSY, "Device timeout" },
{ viotape_DeviceUnavail, EIO, "Device unavailable" },
{ viotape_DeviceBusy, EBUSY, "Device busy" },
{ viotape_EndOfMedia, ENOSPC, "End of media" },
{ viotape_EndOfTape, ENOSPC, "End of tape" },
{ viotape_EquipCheck, EIO, "Equipment check" },
{ viotape_InsufficientRs, EOVERFLOW, "Insufficient tape resources" },
{ viotape_InvalidLogBlk, EIO, "Invalid logical block location" },
{ viotape_LengthError, EOVERFLOW, "Length error" },
{ viotape_LibDoorOpen, EBUSY, "Door open" },
{ viotape_LoadFailure, ENOMEDIUM, "Load failure" },
{ viotape_NotCapable, EIO, "Not capable" },
{ viotape_NotOperational, EIO, "Not operational" },
{ viotape_NotReady, EIO, "Not ready" },
{ viotape_OpCancelled, EIO, "Operation cancelled" },
{ viotape_PhyLinkErr, EIO, "Physical link error" },
{ viotape_RdyNotBOT, EIO, "Ready but not beginning of tape" },
{ viotape_TapeMark, EIO, "Tape mark" },
{ viotape_WriteProt, EROFS, "Write protection error" },
{ 0, 0, NULL },
};
/* Maximum number of tapes we support */
#define VIOTAPE_MAX_TAPE HVMAXARCHITECTEDVIRTUALTAPES
#define MAX_PARTITIONS 4
/* defines for current tape state */
#define VIOT_IDLE 0
#define VIOT_READING 1
#define VIOT_WRITING 2
/* Our info on the tapes */
static struct {
const char *rsrcname;
const char *type;
const char *model;
} viotape_unitinfo[VIOTAPE_MAX_TAPE];
static struct mtget viomtget[VIOTAPE_MAX_TAPE];
static struct class *tape_class;
static struct device *tape_device[VIOTAPE_MAX_TAPE];
/*
* maintain the current state of each tape (and partition)
* so that we know when to write EOF marks.
*/
static struct {
unsigned char cur_part;
unsigned char part_stat_rwi[MAX_PARTITIONS];
} state[VIOTAPE_MAX_TAPE];
/* We single-thread */
static struct semaphore reqSem;
/*
* When we send a request, we use this struct to get the response back
* from the interrupt handler
*/
struct op_struct {
void *buffer;
dma_addr_t dmaaddr;
size_t count;
int rc;
int non_blocking;
struct completion com;
struct device *dev;
struct op_struct *next;
};
static spinlock_t op_struct_list_lock;
static struct op_struct *op_struct_list;
/* forward declaration to resolve interdependence */
static int chg_state(int index, unsigned char new_state, struct file *file);
/* procfs support */
static int proc_viotape_show(struct seq_file *m, void *v)
{
int i;
seq_printf(m, "viotape driver version " VIOTAPE_VERSION "\n");
for (i = 0; i < viotape_numdev; i++) {
seq_printf(m, "viotape device %d is iSeries resource %10.10s"
"type %4.4s, model %3.3s\n",
i, viotape_unitinfo[i].rsrcname,
viotape_unitinfo[i].type,
viotape_unitinfo[i].model);
}
return 0;
}
static int proc_viotape_open(struct inode *inode, struct file *file)
{
return single_open(file, proc_viotape_show, NULL);
}
static const struct file_operations proc_viotape_operations = {
.owner = THIS_MODULE,
.open = proc_viotape_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
/* Decode the device minor number into its parts */
void get_dev_info(struct inode *ino, struct viot_devinfo_struct *devi)
{
devi->devno = iminor(ino) & 0x1F;
devi->mode = (iminor(ino) & 0x60) >> 5;
/* if bit is set in the minor, do _not_ rewind automatically */
devi->rewind = (iminor(ino) & 0x80) == 0;
}
/* This is called only from the exit and init paths, so no need for locking */
static void clear_op_struct_pool(void)
{
while (op_struct_list) {
struct op_struct *toFree = op_struct_list;
op_struct_list = op_struct_list->next;
kfree(toFree);
}
}
/* Likewise, this is only called from the init path */
static int add_op_structs(int structs)
{
int i;
for (i = 0; i < structs; ++i) {
struct op_struct *new_struct =
kmalloc(sizeof(*new_struct), GFP_KERNEL);
if (!new_struct) {
clear_op_struct_pool();
return -ENOMEM;
}
new_struct->next = op_struct_list;
op_struct_list = new_struct;
}
return 0;
}
/* Allocate an op structure from our pool */
static struct op_struct *get_op_struct(void)
{
struct op_struct *retval;
unsigned long flags;
spin_lock_irqsave(&op_struct_list_lock, flags);
retval = op_struct_list;
if (retval)
op_struct_list = retval->next;
spin_unlock_irqrestore(&op_struct_list_lock, flags);
if (retval) {
memset(retval, 0, sizeof(*retval));
init_completion(&retval->com);
}
return retval;
}
/* Return an op structure to our pool */
static void free_op_struct(struct op_struct *op_struct)
{
unsigned long flags;
spin_lock_irqsave(&op_struct_list_lock, flags);
op_struct->next = op_struct_list;
op_struct_list = op_struct;
spin_unlock_irqrestore(&op_struct_list_lock, flags);
}
/* Map our tape return codes to errno values */
int tape_rc_to_errno(int tape_rc, char *operation, int tapeno)
{
const struct vio_error_entry *err;
if (tape_rc == 0)
return 0;
err = vio_lookup_rc(viotape_err_table, tape_rc);
printk(VIOTAPE_KERN_WARN "error(%s) 0x%04x on Device %d (%-10s): %s\n",
operation, tape_rc, tapeno,
viotape_unitinfo[tapeno].rsrcname, err->msg);
return -err->errno;
}
/* Write */
static ssize_t viotap_write(struct file *file, const char *buf,
size_t count, loff_t * ppos)
{
HvLpEvent_Rc hvrc;
unsigned short flags = file->f_flags;
int noblock = ((flags & O_NONBLOCK) != 0);
ssize_t ret;
struct viot_devinfo_struct devi;
struct op_struct *op = get_op_struct();
if (op == NULL)
return -ENOMEM;
get_dev_info(file->f_path.dentry->d_inode, &devi);
/*
* We need to make sure we can send a request. We use
* a semaphore to keep track of # requests in use. If
* we are non-blocking, make sure we don't block on the
* semaphore
*/
if (noblock) {
if (down_trylock(&reqSem)) {
ret = -EWOULDBLOCK;
goto free_op;
}
} else
down(&reqSem);
/* Allocate a DMA buffer */
op->dev = tape_device[devi.devno];
op->buffer = dma_alloc_coherent(op->dev, count, &op->dmaaddr,
GFP_ATOMIC);
if (op->buffer == NULL) {
printk(VIOTAPE_KERN_WARN
"error allocating dma buffer for len %ld\n",
count);
ret = -EFAULT;
goto up_sem;
}
/* Copy the data into the buffer */
if (copy_from_user(op->buffer, buf, count)) {
printk(VIOTAPE_KERN_WARN "tape: error on copy from user\n");
ret = -EFAULT;
goto free_dma;
}
op->non_blocking = noblock;
init_completion(&op->com);
op->count = count;
hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
HvLpEvent_Type_VirtualIo,
viomajorsubtype_tape | viotapewrite,
HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
viopath_sourceinst(viopath_hostLp),
viopath_targetinst(viopath_hostLp),
(u64)(unsigned long)op, VIOVERSION << 16,
((u64)devi.devno << 48) | op->dmaaddr, count, 0, 0);
if (hvrc != HvLpEvent_Rc_Good) {
printk(VIOTAPE_KERN_WARN "hv error on op %d\n",
(int)hvrc);
ret = -EIO;
goto free_dma;
}
if (noblock)
return count;
wait_for_completion(&op->com);
if (op->rc)
ret = tape_rc_to_errno(op->rc, "write", devi.devno);
else {
chg_state(devi.devno, VIOT_WRITING, file);
ret = op->count;
}
free_dma:
dma_free_coherent(op->dev, count, op->buffer, op->dmaaddr);
up_sem:
up(&reqSem);
free_op:
free_op_struct(op);
return ret;
}
/* read */
static ssize_t viotap_read(struct file *file, char *buf, size_t count,
loff_t *ptr)
{
HvLpEvent_Rc hvrc;
unsigned short flags = file->f_flags;
struct op_struct *op = get_op_struct();
int noblock = ((flags & O_NONBLOCK) != 0);
ssize_t ret;
struct viot_devinfo_struct devi;
if (op == NULL)
return -ENOMEM;
get_dev_info(file->f_path.dentry->d_inode, &devi);
/*
* We need to make sure we can send a request. We use
* a semaphore to keep track of # requests in use. If
* we are non-blocking, make sure we don't block on the
* semaphore
*/
if (noblock) {
if (down_trylock(&reqSem)) {
ret = -EWOULDBLOCK;
goto free_op;
}
} else
down(&reqSem);
chg_state(devi.devno, VIOT_READING, file);
/* Allocate a DMA buffer */
op->dev = tape_device[devi.devno];
op->buffer = dma_alloc_coherent(op->dev, count, &op->dmaaddr,
GFP_ATOMIC);
if (op->buffer == NULL) {
ret = -EFAULT;
goto up_sem;
}
op->count = count;
init_completion(&op->com);
hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
HvLpEvent_Type_VirtualIo,
viomajorsubtype_tape | viotaperead,
HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
viopath_sourceinst(viopath_hostLp),
viopath_targetinst(viopath_hostLp),
(u64)(unsigned long)op, VIOVERSION << 16,
((u64)devi.devno << 48) | op->dmaaddr, count, 0, 0);
if (hvrc != HvLpEvent_Rc_Good) {
printk(VIOTAPE_KERN_WARN "tape hv error on op %d\n",
(int)hvrc);
ret = -EIO;
goto free_dma;
}
wait_for_completion(&op->com);
if (op->rc)
ret = tape_rc_to_errno(op->rc, "read", devi.devno);
else {
ret = op->count;
if (ret && copy_to_user(buf, op->buffer, ret)) {
printk(VIOTAPE_KERN_WARN "error on copy_to_user\n");
ret = -EFAULT;
}
}
free_dma:
dma_free_coherent(op->dev, count, op->buffer, op->dmaaddr);
up_sem:
up(&reqSem);
free_op:
free_op_struct(op);
return ret;
}
/* ioctl */
static int viotap_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
HvLpEvent_Rc hvrc;
int ret;
struct viot_devinfo_struct devi;
struct mtop mtc;
u32 myOp;
struct op_struct *op = get_op_struct();
if (op == NULL)
return -ENOMEM;
get_dev_info(file->f_path.dentry->d_inode, &devi);
down(&reqSem);
ret = -EINVAL;
switch (cmd) {
case MTIOCTOP:
ret = -EFAULT;
/*
* inode is null if and only if we (the kernel)
* made the request
*/
if (inode == NULL)
memcpy(&mtc, (void *) arg, sizeof(struct mtop));
else if (copy_from_user((char *)&mtc, (char *)arg,
sizeof(struct mtop)))
goto free_op;
ret = -EIO;
switch (mtc.mt_op) {
case MTRESET:
myOp = VIOTAPOP_RESET;
break;
case MTFSF:
myOp = VIOTAPOP_FSF;
break;
case MTBSF:
myOp = VIOTAPOP_BSF;
break;
case MTFSR:
myOp = VIOTAPOP_FSR;
break;
case MTBSR:
myOp = VIOTAPOP_BSR;
break;
case MTWEOF:
myOp = VIOTAPOP_WEOF;
break;
case MTREW:
myOp = VIOTAPOP_REW;
break;
case MTNOP:
myOp = VIOTAPOP_NOP;
break;
case MTEOM:
myOp = VIOTAPOP_EOM;
break;
case MTERASE:
myOp = VIOTAPOP_ERASE;
break;
case MTSETBLK:
myOp = VIOTAPOP_SETBLK;
break;
case MTSETDENSITY:
myOp = VIOTAPOP_SETDENSITY;
break;
case MTTELL:
myOp = VIOTAPOP_GETPOS;
break;
case MTSEEK:
myOp = VIOTAPOP_SETPOS;
break;
case MTSETPART:
myOp = VIOTAPOP_SETPART;
break;
case MTOFFL:
myOp = VIOTAPOP_UNLOAD;
break;
default:
printk(VIOTAPE_KERN_WARN "MTIOCTOP called "
"with invalid op 0x%x\n", mtc.mt_op);
goto free_op;
}
/*
* if we moved the head, we are no longer
* reading or writing
*/
switch (mtc.mt_op) {
case MTFSF:
case MTBSF:
case MTFSR:
case MTBSR:
case MTTELL:
case MTSEEK:
case MTREW:
chg_state(devi.devno, VIOT_IDLE, file);
}
init_completion(&op->com);
hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
HvLpEvent_Type_VirtualIo,
viomajorsubtype_tape | viotapeop,
HvLpEvent_AckInd_DoAck,
HvLpEvent_AckType_ImmediateAck,
viopath_sourceinst(viopath_hostLp),
viopath_targetinst(viopath_hostLp),
(u64)(unsigned long)op,
VIOVERSION << 16,
((u64)devi.devno << 48), 0,
(((u64)myOp) << 32) | mtc.mt_count, 0);
if (hvrc != HvLpEvent_Rc_Good) {
printk(VIOTAPE_KERN_WARN "hv error on op %d\n",
(int)hvrc);
goto free_op;
}
wait_for_completion(&op->com);
ret = tape_rc_to_errno(op->rc, "tape operation", devi.devno);
goto free_op;
case MTIOCGET:
ret = -EIO;
init_completion(&op->com);
hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
HvLpEvent_Type_VirtualIo,
viomajorsubtype_tape | viotapegetstatus,
HvLpEvent_AckInd_DoAck,
HvLpEvent_AckType_ImmediateAck,
viopath_sourceinst(viopath_hostLp),
viopath_targetinst(viopath_hostLp),
(u64)(unsigned long)op, VIOVERSION << 16,
((u64)devi.devno << 48), 0, 0, 0);
if (hvrc != HvLpEvent_Rc_Good) {
printk(VIOTAPE_KERN_WARN "hv error on op %d\n",
(int)hvrc);
goto free_op;
}
wait_for_completion(&op->com);
/* Operation is complete - grab the error code */
ret = tape_rc_to_errno(op->rc, "get status", devi.devno);
free_op_struct(op);
up(&reqSem);
if ((ret == 0) && copy_to_user((void *)arg,
&viomtget[devi.devno],
sizeof(viomtget[0])))
ret = -EFAULT;
return ret;
case MTIOCPOS:
printk(VIOTAPE_KERN_WARN "Got an (unsupported) MTIOCPOS\n");
break;
default:
printk(VIOTAPE_KERN_WARN "got an unsupported ioctl 0x%0x\n",
cmd);
break;
}
free_op:
free_op_struct(op);
up(&reqSem);
return ret;
}
static long viotap_unlocked_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
long rc;
lock_kernel();
rc = viotap_ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
unlock_kernel();
return rc;
}
static int viotap_open(struct inode *inode, struct file *file)
{
HvLpEvent_Rc hvrc;
struct viot_devinfo_struct devi;
int ret;
struct op_struct *op = get_op_struct();
if (op == NULL)
return -ENOMEM;
lock_kernel();
get_dev_info(file->f_path.dentry->d_inode, &devi);
/* Note: We currently only support one mode! */
if ((devi.devno >= viotape_numdev) || (devi.mode)) {
ret = -ENODEV;
goto free_op;
}
init_completion(&op->com);
hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
HvLpEvent_Type_VirtualIo,
viomajorsubtype_tape | viotapeopen,
HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
viopath_sourceinst(viopath_hostLp),
viopath_targetinst(viopath_hostLp),
(u64)(unsigned long)op, VIOVERSION << 16,
((u64)devi.devno << 48), 0, 0, 0);
if (hvrc != 0) {
printk(VIOTAPE_KERN_WARN "bad rc on signalLpEvent %d\n",
(int) hvrc);
ret = -EIO;
goto free_op;
}
wait_for_completion(&op->com);
ret = tape_rc_to_errno(op->rc, "open", devi.devno);
free_op:
free_op_struct(op);
unlock_kernel();
return ret;
}
static int viotap_release(struct inode *inode, struct file *file)
{
HvLpEvent_Rc hvrc;
struct viot_devinfo_struct devi;
int ret = 0;
struct op_struct *op = get_op_struct();
if (op == NULL)
return -ENOMEM;
init_completion(&op->com);
get_dev_info(file->f_path.dentry->d_inode, &devi);
if (devi.devno >= viotape_numdev) {
ret = -ENODEV;
goto free_op;
}
chg_state(devi.devno, VIOT_IDLE, file);
if (devi.rewind) {
hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
HvLpEvent_Type_VirtualIo,
viomajorsubtype_tape | viotapeop,
HvLpEvent_AckInd_DoAck,
HvLpEvent_AckType_ImmediateAck,
viopath_sourceinst(viopath_hostLp),
viopath_targetinst(viopath_hostLp),
(u64)(unsigned long)op, VIOVERSION << 16,
((u64)devi.devno << 48), 0,
((u64)VIOTAPOP_REW) << 32, 0);
wait_for_completion(&op->com);
tape_rc_to_errno(op->rc, "rewind", devi.devno);
}
hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
HvLpEvent_Type_VirtualIo,
viomajorsubtype_tape | viotapeclose,
HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
viopath_sourceinst(viopath_hostLp),
viopath_targetinst(viopath_hostLp),
(u64)(unsigned long)op, VIOVERSION << 16,
((u64)devi.devno << 48), 0, 0, 0);
if (hvrc != 0) {
printk(VIOTAPE_KERN_WARN "bad rc on signalLpEvent %d\n",
(int) hvrc);
ret = -EIO;
goto free_op;
}
wait_for_completion(&op->com);
if (op->rc)
printk(VIOTAPE_KERN_WARN "close failed\n");
free_op:
free_op_struct(op);
return ret;
}
const struct file_operations viotap_fops = {
.owner = THIS_MODULE,
.read = viotap_read,
.write = viotap_write,
.unlocked_ioctl = viotap_unlocked_ioctl,
.open = viotap_open,
.release = viotap_release,
};
/* Handle interrupt events for tape */
static void vioHandleTapeEvent(struct HvLpEvent *event)
{
int tapeminor;
struct op_struct *op;
struct viotapelpevent *tevent = (struct viotapelpevent *)event;
if (event == NULL) {
/* Notification that a partition went away! */
if (!viopath_isactive(viopath_hostLp)) {
/* TODO! Clean up */
}
return;
}
tapeminor = event->xSubtype & VIOMINOR_SUBTYPE_MASK;
op = (struct op_struct *)event->xCorrelationToken;
switch (tapeminor) {
case viotapeopen:
case viotapeclose:
op->rc = tevent->sub_type_result;
complete(&op->com);
break;
case viotaperead:
op->rc = tevent->sub_type_result;
op->count = tevent->len;
complete(&op->com);
break;
case viotapewrite:
if (op->non_blocking) {
dma_free_coherent(op->dev, op->count,
op->buffer, op->dmaaddr);
free_op_struct(op);
up(&reqSem);
} else {
op->rc = tevent->sub_type_result;
op->count = tevent->len;
complete(&op->com);
}
break;
case viotapeop:
case viotapegetpos:
case viotapesetpos:
case viotapegetstatus:
if (op) {
op->count = tevent->u.op.count;
op->rc = tevent->sub_type_result;
if (!op->non_blocking)
complete(&op->com);
}
break;
default:
printk(VIOTAPE_KERN_WARN "weird ack\n");
}
}
static int viotape_probe(struct vio_dev *vdev, const struct vio_device_id *id)
{
int i = vdev->unit_address;
int j;
struct device_node *node = vdev->dev.archdata.of_node;
if (i > VIOTAPE_MAX_TAPE)
return -ENODEV;
if (!node)
return -ENODEV;
if (i >= viotape_numdev)
viotape_numdev = i + 1;
tape_device[i] = &vdev->dev;
viotape_unitinfo[i].rsrcname = of_get_property(node,
"linux,vio_rsrcname", NULL);
viotape_unitinfo[i].type = of_get_property(node, "linux,vio_type",
NULL);
viotape_unitinfo[i].model = of_get_property(node, "linux,vio_model",
NULL);
state[i].cur_part = 0;
for (j = 0; j < MAX_PARTITIONS; ++j)
state[i].part_stat_rwi[j] = VIOT_IDLE;
device_create(tape_class, NULL, MKDEV(VIOTAPE_MAJOR, i), NULL,
"iseries!vt%d", i);
device_create(tape_class, NULL, MKDEV(VIOTAPE_MAJOR, i | 0x80), NULL,
"iseries!nvt%d", i);
printk(VIOTAPE_KERN_INFO "tape iseries/vt%d is iSeries "
"resource %10.10s type %4.4s, model %3.3s\n",
i, viotape_unitinfo[i].rsrcname,
viotape_unitinfo[i].type, viotape_unitinfo[i].model);
return 0;
}
static int viotape_remove(struct vio_dev *vdev)
{
int i = vdev->unit_address;
device_destroy(tape_class, MKDEV(VIOTAPE_MAJOR, i | 0x80));
device_destroy(tape_class, MKDEV(VIOTAPE_MAJOR, i));
return 0;
}
/**
* viotape_device_table: Used by vio.c to match devices that we
* support.
*/
static struct vio_device_id viotape_device_table[] __devinitdata = {
{ "byte", "IBM,iSeries-viotape" },
{ "", "" }
};
MODULE_DEVICE_TABLE(vio, viotape_device_table);
static struct vio_driver viotape_driver = {
.id_table = viotape_device_table,
.probe = viotape_probe,
.remove = viotape_remove,
.driver = {
.name = "viotape",
.owner = THIS_MODULE,
}
};
int __init viotap_init(void)
{
int ret;
if (!firmware_has_feature(FW_FEATURE_ISERIES))
return -ENODEV;
op_struct_list = NULL;
if ((ret = add_op_structs(VIOTAPE_MAXREQ)) < 0) {
printk(VIOTAPE_KERN_WARN "couldn't allocate op structs\n");
return ret;
}
spin_lock_init(&op_struct_list_lock);
sema_init(&reqSem, VIOTAPE_MAXREQ);
if (viopath_hostLp == HvLpIndexInvalid) {
vio_set_hostlp();
if (viopath_hostLp == HvLpIndexInvalid) {
ret = -ENODEV;
goto clear_op;
}
}
ret = viopath_open(viopath_hostLp, viomajorsubtype_tape,
VIOTAPE_MAXREQ + 2);
if (ret) {
printk(VIOTAPE_KERN_WARN
"error on viopath_open to hostlp %d\n", ret);
ret = -EIO;
goto clear_op;
}
printk(VIOTAPE_KERN_INFO "vers " VIOTAPE_VERSION
", hosting partition %d\n", viopath_hostLp);
vio_setHandler(viomajorsubtype_tape, vioHandleTapeEvent);
ret = register_chrdev(VIOTAPE_MAJOR, "viotape", &viotap_fops);
if (ret < 0) {
printk(VIOTAPE_KERN_WARN "Error registering viotape device\n");
goto clear_handler;
}
tape_class = class_create(THIS_MODULE, "tape");
if (IS_ERR(tape_class)) {
printk(VIOTAPE_KERN_WARN "Unable to allocat class\n");
ret = PTR_ERR(tape_class);
goto unreg_chrdev;
}
ret = vio_register_driver(&viotape_driver);
if (ret)
goto unreg_class;
proc_create("iSeries/viotape", S_IFREG|S_IRUGO, NULL,
&proc_viotape_operations);
return 0;
unreg_class:
class_destroy(tape_class);
unreg_chrdev:
unregister_chrdev(VIOTAPE_MAJOR, "viotape");
clear_handler:
vio_clearHandler(viomajorsubtype_tape);
viopath_close(viopath_hostLp, viomajorsubtype_tape, VIOTAPE_MAXREQ + 2);
clear_op:
clear_op_struct_pool();
return ret;
}
/* Give a new state to the tape object */
static int chg_state(int index, unsigned char new_state, struct file *file)
{
unsigned char *cur_state =
&state[index].part_stat_rwi[state[index].cur_part];
int rc = 0;
/* if the same state, don't bother */
if (*cur_state == new_state)
return 0;
/* write an EOF if changing from writing to some other state */
if (*cur_state == VIOT_WRITING) {
struct mtop write_eof = { MTWEOF, 1 };
rc = viotap_ioctl(NULL, file, MTIOCTOP,
(unsigned long)&write_eof);
}
*cur_state = new_state;
return rc;
}
/* Cleanup */
static void __exit viotap_exit(void)
{
remove_proc_entry("iSeries/viotape", NULL);
vio_unregister_driver(&viotape_driver);
class_destroy(tape_class);
unregister_chrdev(VIOTAPE_MAJOR, "viotape");
viopath_close(viopath_hostLp, viomajorsubtype_tape, VIOTAPE_MAXREQ + 2);
vio_clearHandler(viomajorsubtype_tape);
clear_op_struct_pool();
}
MODULE_LICENSE("GPL");
module_init(viotap_init);
module_exit(viotap_exit);
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