--- /dev/null
+/* -*- 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 <sfr@au1.ibm.com>
+ *
+ * (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/config.h>
+#include <linux/version.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/devfs_fs_kernel.h>
+#include <linux/major.h>
+#include <linux/completion.h>
+
+#include <asm/uaccess.h>
+#include <asm/ioctls.h>
+
+#include <asm/iSeries/vio.h>
+#include <asm/iSeries/HvLpEvent.h>
+#include <asm/iSeries/HvCallEvent.h>
+#include <asm/iSeries/HvLpConfig.h>
+
+#define VIOTAPE_VERSION "1.1"
+#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 8
+#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_simple *tape_class;
+
+/*
+ * 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 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);
+
+/* 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->buffer = dma_alloc_coherent(iSeries_vio_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(iSeries_vio_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->buffer = dma_alloc_coherent(iSeries_vio_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(iSeries_vio_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(iSeries_vio_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 "wierd ack\n");
+ }
+}
+
+
+int __init viotap_init(void)
+{
+ int ret;
+ char tapename[32];
+ int i;
+
+ printk(VIOTAPE_KERN_INFO "driver version " VIOTAPE_VERSION "\n");
+
+ 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;
+ }
+ }
+
+ printk(VIOTAPE_KERN_INFO "init - open path to hosting (%d)\n",
+ viopath_hostLp);
+ 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;
+ }
+
+ 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_simple_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;
+ }
+
+ for (i = 0; i < viotape_numdev; i++) {
+ int j;
+
+ state[i].cur_part = 0;
+ for (j = 0; j < MAX_PARTITIONS; ++j)
+ state[i].part_stat_rwi[j] = VIOT_IDLE;
+ class_simple_device_add(tape_class, MKDEV(VIOTAPE_MAJOR, i),
+ NULL, "iseries!vt%d", i);
+ class_simple_device_add(tape_class,
+ 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;
+
+unreg_class:
+ class_simple_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 i, ret;
+
+ for (i = 0; i < viotape_numdev; ++i) {
+ devfs_remove("iseries/nvt%d", i);
+ devfs_remove("iseries/vt%d", i);
+ devfs_unregister_tape(state[i].dev_handle);
+ class_simple_device_remove(MKDEV(VIOTAPE_MAJOR, i | 0x80));
+ class_simple_device_remove(MKDEV(VIOTAPE_MAJOR, i));
+ }
+ class_simple_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);
projects / linux / commitdiff