/* -*- linux-c -*- * drivers/char/viotape.c * * iSeries Virtual Tape * * Authors: Dave Boutcher * Ryan Arnold * Colin Devilbiss * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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 struct viotapelpevent { struct HvLpEvent event; u32 reserved; u16 version; u16 sub_type_result; u16 tape; u16 flags; u32 token; u64 len; union { struct { u32 tape_op; u32 count; } op; struct { u32 type; u32 resid; u32 dsreg; u32 gstat; u32 erreg; u32 file_no; u32 block_no; } get_status; struct { u32 block_no; } get_pos; } u; }; enum viotapesubtype { viotapeopen = 0x0001, viotapeclose = 0x0002, viotaperead = 0x0003, viotapewrite = 0x0004, viotapegetinfo = 0x0005, viotapeop = 0x0006, viotapegetpos = 0x0007, viotapesetpos = 0x0008, viotapegetstatus = 0x0009 }; 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 */ struct tape_descr { char rsrcname[10]; char type[4]; char model[3]; }; static struct tape_descr *viotape_unitinfo; static dma_addr_t viotape_unitinfo_token; 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; int dev_handle; 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 struct file_operations proc_viotape_operations = { .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; } /* Get info on all tapes from OS/400 */ static int get_viotape_info(void) { HvLpEvent_Rc hvrc; int i; size_t len = sizeof(*viotape_unitinfo) * VIOTAPE_MAX_TAPE; struct op_struct *op = get_op_struct(); if (op == NULL) return -ENOMEM; viotape_unitinfo = dma_alloc_coherent(iSeries_vio_dev, len, &viotape_unitinfo_token, GFP_ATOMIC); if (viotape_unitinfo == NULL) { free_op_struct(op); return -ENOMEM; } memset(viotape_unitinfo, 0, len); hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, HvLpEvent_Type_VirtualIo, viomajorsubtype_tape | viotapegetinfo, HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck, viopath_sourceinst(viopath_hostLp), viopath_targetinst(viopath_hostLp), (u64) (unsigned long) op, VIOVERSION << 16, viotape_unitinfo_token, len, 0, 0); if (hvrc != HvLpEvent_Rc_Good) { printk(VIOTAPE_KERN_WARN "hv error on op %d\n", (int)hvrc); free_op_struct(op); return -EIO; } wait_for_completion(&op->com); free_op_struct(op); for (i = 0; ((i < VIOTAPE_MAX_TAPE) && (viotape_unitinfo[i].rsrcname[0])); i++) viotape_numdev++; return 0; } /* 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_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_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_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 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; get_dev_info(file->f_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); 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_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; } struct file_operations viotap_fops = { owner: THIS_MODULE, read: viotap_read, write: viotap_write, ioctl: viotap_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 viotapegetinfo: 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) { char tapename[32]; int i = vdev->unit_address; int j; if (i >= viotape_numdev) return -ENODEV; tape_device[i] = &vdev->dev; state[i].cur_part = 0; for (j = 0; j < MAX_PARTITIONS; ++j) state[i].part_stat_rwi[j] = VIOT_IDLE; class_device_create(tape_class, NULL, MKDEV(VIOTAPE_MAJOR, i), NULL, "iseries!vt%d", i); class_device_create(tape_class, NULL, MKDEV(VIOTAPE_MAJOR, i | 0x80), NULL, "iseries!nvt%d", i); devfs_mk_cdev(MKDEV(VIOTAPE_MAJOR, i), S_IFCHR | S_IRUSR | S_IWUSR, "iseries/vt%d", i); devfs_mk_cdev(MKDEV(VIOTAPE_MAJOR, i | 0x80), S_IFCHR | S_IRUSR | S_IWUSR, "iseries/nvt%d", i); sprintf(tapename, "iseries/vt%d", i); state[i].dev_handle = devfs_register_tape(tapename); printk(VIOTAPE_KERN_INFO "tape %s is iSeries " "resource %10.10s type %4.4s, model %3.3s\n", tapename, 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; devfs_remove("iseries/nvt%d", i); devfs_remove("iseries/vt%d", i); devfs_unregister_tape(state[i].dev_handle); class_device_destroy(tape_class, MKDEV(VIOTAPE_MAJOR, i | 0x80)); class_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 = { { "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; struct proc_dir_entry *e; 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; } if ((ret = get_viotape_info()) < 0) { printk(VIOTAPE_KERN_WARN "Unable to obtain virtual device information"); goto unreg_class; } ret = vio_register_driver(&viotape_driver); if (ret) goto unreg_class; e = create_proc_entry("iSeries/viotape", S_IFREG|S_IRUGO, NULL); if (e) { e->owner = THIS_MODULE; e->proc_fops = &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) { int ret; remove_proc_entry("iSeries/viotape", NULL); vio_unregister_driver(&viotape_driver); class_destroy(tape_class); ret = unregister_chrdev(VIOTAPE_MAJOR, "viotape"); if (ret < 0) printk(VIOTAPE_KERN_WARN "Error unregistering device: %d\n", ret); if (viotape_unitinfo) dma_free_coherent(iSeries_vio_dev, sizeof(viotape_unitinfo[0]) * VIOTAPE_MAX_TAPE, viotape_unitinfo, viotape_unitinfo_token); 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);