diff options
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/viotape.c | 1041 |
1 files changed, 0 insertions, 1041 deletions
diff --git a/drivers/char/viotape.c b/drivers/char/viotape.c deleted file mode 100644 index ad6e64a2912d..000000000000 --- a/drivers/char/viotape.c +++ /dev/null @@ -1,1041 +0,0 @@ -/* -*- 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/mutex.h> -#include <linux/slab.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 DEFINE_MUTEX(proc_viotape_mutex); -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; - - mutex_lock(&proc_viotape_mutex); - rc = viotap_ioctl(file->f_path.dentry->d_inode, file, cmd, arg); - mutex_unlock(&proc_viotape_mutex); - 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; - - mutex_lock(&proc_viotape_mutex); - 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); - mutex_unlock(&proc_viotape_mutex); - 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, - .llseek = noop_llseek, -}; - -/* 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.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); |