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![Arjan van de Ven](/assets/img/avatar_default.png)
Many struct file_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1121 lines
27 KiB
C
1121 lines
27 KiB
C
/* -*- linux-c -*-
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* drivers/char/viotape.c
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*
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* iSeries Virtual Tape
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*
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* Authors: Dave Boutcher <boutcher@us.ibm.com>
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* Ryan Arnold <ryanarn@us.ibm.com>
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* Colin Devilbiss <devilbis@us.ibm.com>
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* Stephen Rothwell <sfr@au1.ibm.com>
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*
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* (C) Copyright 2000-2004 IBM Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) anyu later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* This routine provides access to tape drives owned and managed by an OS/400
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* partition running on the same box as this Linux partition.
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*
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* All tape operations are performed by sending messages back and forth to
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* the OS/400 partition. The format of the messages is defined in
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* iseries/vio.h
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/wait.h>
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#include <linux/spinlock.h>
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#include <linux/mtio.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/fs.h>
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#include <linux/cdev.h>
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#include <linux/major.h>
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#include <linux/completion.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <asm/uaccess.h>
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#include <asm/ioctls.h>
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#include <asm/firmware.h>
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#include <asm/vio.h>
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#include <asm/iseries/vio.h>
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#include <asm/iseries/hv_lp_event.h>
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#include <asm/iseries/hv_call_event.h>
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#include <asm/iseries/hv_lp_config.h>
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#define VIOTAPE_VERSION "1.2"
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#define VIOTAPE_MAXREQ 1
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#define VIOTAPE_KERN_WARN KERN_WARNING "viotape: "
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#define VIOTAPE_KERN_INFO KERN_INFO "viotape: "
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static int viotape_numdev;
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/*
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* The minor number follows the conventions of the SCSI tape drives. The
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* rewind and mode are encoded in the minor #. We use this struct to break
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* them out
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*/
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struct viot_devinfo_struct {
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int devno;
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int mode;
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int rewind;
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};
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#define VIOTAPOP_RESET 0
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#define VIOTAPOP_FSF 1
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#define VIOTAPOP_BSF 2
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#define VIOTAPOP_FSR 3
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#define VIOTAPOP_BSR 4
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#define VIOTAPOP_WEOF 5
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#define VIOTAPOP_REW 6
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#define VIOTAPOP_NOP 7
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#define VIOTAPOP_EOM 8
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#define VIOTAPOP_ERASE 9
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#define VIOTAPOP_SETBLK 10
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#define VIOTAPOP_SETDENSITY 11
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#define VIOTAPOP_SETPOS 12
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#define VIOTAPOP_GETPOS 13
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#define VIOTAPOP_SETPART 14
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#define VIOTAPOP_UNLOAD 15
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struct viotapelpevent {
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struct HvLpEvent event;
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u32 reserved;
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u16 version;
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u16 sub_type_result;
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u16 tape;
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u16 flags;
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u32 token;
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u64 len;
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union {
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struct {
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u32 tape_op;
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u32 count;
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} op;
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struct {
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u32 type;
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u32 resid;
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u32 dsreg;
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u32 gstat;
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u32 erreg;
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u32 file_no;
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u32 block_no;
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} get_status;
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struct {
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u32 block_no;
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} get_pos;
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} u;
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};
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enum viotapesubtype {
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viotapeopen = 0x0001,
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viotapeclose = 0x0002,
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viotaperead = 0x0003,
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viotapewrite = 0x0004,
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viotapegetinfo = 0x0005,
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viotapeop = 0x0006,
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viotapegetpos = 0x0007,
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viotapesetpos = 0x0008,
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viotapegetstatus = 0x0009
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};
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enum viotaperc {
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viotape_InvalidRange = 0x0601,
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viotape_InvalidToken = 0x0602,
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viotape_DMAError = 0x0603,
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viotape_UseError = 0x0604,
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viotape_ReleaseError = 0x0605,
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viotape_InvalidTape = 0x0606,
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viotape_InvalidOp = 0x0607,
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viotape_TapeErr = 0x0608,
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viotape_AllocTimedOut = 0x0640,
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viotape_BOTEnc = 0x0641,
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viotape_BlankTape = 0x0642,
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viotape_BufferEmpty = 0x0643,
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viotape_CleanCartFound = 0x0644,
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viotape_CmdNotAllowed = 0x0645,
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viotape_CmdNotSupported = 0x0646,
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viotape_DataCheck = 0x0647,
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viotape_DecompressErr = 0x0648,
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viotape_DeviceTimeout = 0x0649,
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viotape_DeviceUnavail = 0x064a,
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viotape_DeviceBusy = 0x064b,
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viotape_EndOfMedia = 0x064c,
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viotape_EndOfTape = 0x064d,
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viotape_EquipCheck = 0x064e,
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viotape_InsufficientRs = 0x064f,
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viotape_InvalidLogBlk = 0x0650,
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viotape_LengthError = 0x0651,
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viotape_LibDoorOpen = 0x0652,
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viotape_LoadFailure = 0x0653,
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viotape_NotCapable = 0x0654,
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viotape_NotOperational = 0x0655,
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viotape_NotReady = 0x0656,
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viotape_OpCancelled = 0x0657,
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viotape_PhyLinkErr = 0x0658,
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viotape_RdyNotBOT = 0x0659,
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viotape_TapeMark = 0x065a,
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viotape_WriteProt = 0x065b
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};
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static const struct vio_error_entry viotape_err_table[] = {
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{ viotape_InvalidRange, EIO, "Internal error" },
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{ viotape_InvalidToken, EIO, "Internal error" },
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{ viotape_DMAError, EIO, "DMA error" },
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{ viotape_UseError, EIO, "Internal error" },
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{ viotape_ReleaseError, EIO, "Internal error" },
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{ viotape_InvalidTape, EIO, "Invalid tape device" },
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{ viotape_InvalidOp, EIO, "Invalid operation" },
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{ viotape_TapeErr, EIO, "Tape error" },
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{ viotape_AllocTimedOut, EBUSY, "Allocate timed out" },
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{ viotape_BOTEnc, EIO, "Beginning of tape encountered" },
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{ viotape_BlankTape, EIO, "Blank tape" },
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{ viotape_BufferEmpty, EIO, "Buffer empty" },
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{ viotape_CleanCartFound, ENOMEDIUM, "Cleaning cartridge found" },
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{ viotape_CmdNotAllowed, EIO, "Command not allowed" },
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{ viotape_CmdNotSupported, EIO, "Command not supported" },
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{ viotape_DataCheck, EIO, "Data check" },
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{ viotape_DecompressErr, EIO, "Decompression error" },
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{ viotape_DeviceTimeout, EBUSY, "Device timeout" },
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{ viotape_DeviceUnavail, EIO, "Device unavailable" },
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{ viotape_DeviceBusy, EBUSY, "Device busy" },
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{ viotape_EndOfMedia, ENOSPC, "End of media" },
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{ viotape_EndOfTape, ENOSPC, "End of tape" },
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{ viotape_EquipCheck, EIO, "Equipment check" },
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{ viotape_InsufficientRs, EOVERFLOW, "Insufficient tape resources" },
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{ viotape_InvalidLogBlk, EIO, "Invalid logical block location" },
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{ viotape_LengthError, EOVERFLOW, "Length error" },
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{ viotape_LibDoorOpen, EBUSY, "Door open" },
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{ viotape_LoadFailure, ENOMEDIUM, "Load failure" },
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{ viotape_NotCapable, EIO, "Not capable" },
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{ viotape_NotOperational, EIO, "Not operational" },
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{ viotape_NotReady, EIO, "Not ready" },
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{ viotape_OpCancelled, EIO, "Operation cancelled" },
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{ viotape_PhyLinkErr, EIO, "Physical link error" },
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{ viotape_RdyNotBOT, EIO, "Ready but not beginning of tape" },
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{ viotape_TapeMark, EIO, "Tape mark" },
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{ viotape_WriteProt, EROFS, "Write protection error" },
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{ 0, 0, NULL },
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};
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/* Maximum number of tapes we support */
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#define VIOTAPE_MAX_TAPE HVMAXARCHITECTEDVIRTUALTAPES
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#define MAX_PARTITIONS 4
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/* defines for current tape state */
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#define VIOT_IDLE 0
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#define VIOT_READING 1
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#define VIOT_WRITING 2
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/* Our info on the tapes */
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struct tape_descr {
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char rsrcname[10];
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char type[4];
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char model[3];
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};
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static struct tape_descr *viotape_unitinfo;
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static dma_addr_t viotape_unitinfo_token;
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static struct mtget viomtget[VIOTAPE_MAX_TAPE];
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static struct class *tape_class;
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static struct device *tape_device[VIOTAPE_MAX_TAPE];
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/*
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* maintain the current state of each tape (and partition)
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* so that we know when to write EOF marks.
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*/
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static struct {
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unsigned char cur_part;
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unsigned char part_stat_rwi[MAX_PARTITIONS];
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} state[VIOTAPE_MAX_TAPE];
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/* We single-thread */
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static struct semaphore reqSem;
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/*
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* When we send a request, we use this struct to get the response back
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* from the interrupt handler
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*/
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struct op_struct {
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void *buffer;
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dma_addr_t dmaaddr;
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size_t count;
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int rc;
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int non_blocking;
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struct completion com;
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struct device *dev;
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struct op_struct *next;
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};
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static spinlock_t op_struct_list_lock;
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static struct op_struct *op_struct_list;
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/* forward declaration to resolve interdependence */
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static int chg_state(int index, unsigned char new_state, struct file *file);
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/* procfs support */
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static int proc_viotape_show(struct seq_file *m, void *v)
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{
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int i;
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seq_printf(m, "viotape driver version " VIOTAPE_VERSION "\n");
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for (i = 0; i < viotape_numdev; i++) {
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seq_printf(m, "viotape device %d is iSeries resource %10.10s"
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"type %4.4s, model %3.3s\n",
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i, viotape_unitinfo[i].rsrcname,
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viotape_unitinfo[i].type,
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viotape_unitinfo[i].model);
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}
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return 0;
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}
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static int proc_viotape_open(struct inode *inode, struct file *file)
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{
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return single_open(file, proc_viotape_show, NULL);
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}
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static const struct file_operations proc_viotape_operations = {
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.open = proc_viotape_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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/* Decode the device minor number into its parts */
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void get_dev_info(struct inode *ino, struct viot_devinfo_struct *devi)
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{
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devi->devno = iminor(ino) & 0x1F;
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devi->mode = (iminor(ino) & 0x60) >> 5;
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/* if bit is set in the minor, do _not_ rewind automatically */
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devi->rewind = (iminor(ino) & 0x80) == 0;
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}
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/* This is called only from the exit and init paths, so no need for locking */
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static void clear_op_struct_pool(void)
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{
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while (op_struct_list) {
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struct op_struct *toFree = op_struct_list;
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op_struct_list = op_struct_list->next;
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kfree(toFree);
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}
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}
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/* Likewise, this is only called from the init path */
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static int add_op_structs(int structs)
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{
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int i;
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for (i = 0; i < structs; ++i) {
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struct op_struct *new_struct =
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kmalloc(sizeof(*new_struct), GFP_KERNEL);
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if (!new_struct) {
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clear_op_struct_pool();
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return -ENOMEM;
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}
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new_struct->next = op_struct_list;
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op_struct_list = new_struct;
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}
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return 0;
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}
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/* Allocate an op structure from our pool */
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static struct op_struct *get_op_struct(void)
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{
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struct op_struct *retval;
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unsigned long flags;
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spin_lock_irqsave(&op_struct_list_lock, flags);
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retval = op_struct_list;
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if (retval)
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op_struct_list = retval->next;
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spin_unlock_irqrestore(&op_struct_list_lock, flags);
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if (retval) {
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memset(retval, 0, sizeof(*retval));
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init_completion(&retval->com);
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}
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return retval;
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}
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/* Return an op structure to our pool */
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static void free_op_struct(struct op_struct *op_struct)
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{
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unsigned long flags;
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spin_lock_irqsave(&op_struct_list_lock, flags);
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op_struct->next = op_struct_list;
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op_struct_list = op_struct;
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spin_unlock_irqrestore(&op_struct_list_lock, flags);
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}
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/* Map our tape return codes to errno values */
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int tape_rc_to_errno(int tape_rc, char *operation, int tapeno)
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{
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const struct vio_error_entry *err;
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if (tape_rc == 0)
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return 0;
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err = vio_lookup_rc(viotape_err_table, tape_rc);
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printk(VIOTAPE_KERN_WARN "error(%s) 0x%04x on Device %d (%-10s): %s\n",
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operation, tape_rc, tapeno,
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viotape_unitinfo[tapeno].rsrcname, err->msg);
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return -err->errno;
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}
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/* Get info on all tapes from OS/400 */
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static int get_viotape_info(void)
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{
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HvLpEvent_Rc hvrc;
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int i;
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size_t len = sizeof(*viotape_unitinfo) * VIOTAPE_MAX_TAPE;
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struct op_struct *op = get_op_struct();
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if (op == NULL)
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return -ENOMEM;
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viotape_unitinfo = dma_alloc_coherent(iSeries_vio_dev, len,
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&viotape_unitinfo_token, GFP_ATOMIC);
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if (viotape_unitinfo == NULL) {
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free_op_struct(op);
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return -ENOMEM;
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}
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memset(viotape_unitinfo, 0, len);
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hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
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HvLpEvent_Type_VirtualIo,
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viomajorsubtype_tape | viotapegetinfo,
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HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
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viopath_sourceinst(viopath_hostLp),
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viopath_targetinst(viopath_hostLp),
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(u64) (unsigned long) op, VIOVERSION << 16,
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viotape_unitinfo_token, len, 0, 0);
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if (hvrc != HvLpEvent_Rc_Good) {
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printk(VIOTAPE_KERN_WARN "hv error on op %d\n",
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(int)hvrc);
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free_op_struct(op);
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return -EIO;
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}
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|
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wait_for_completion(&op->com);
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free_op_struct(op);
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for (i = 0;
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((i < VIOTAPE_MAX_TAPE) && (viotape_unitinfo[i].rsrcname[0]));
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i++)
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viotape_numdev++;
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return 0;
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}
|
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|
|
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/* Write */
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static ssize_t viotap_write(struct file *file, const char *buf,
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size_t count, loff_t * ppos)
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{
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HvLpEvent_Rc hvrc;
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unsigned short flags = file->f_flags;
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int noblock = ((flags & O_NONBLOCK) != 0);
|
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ssize_t ret;
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struct viot_devinfo_struct devi;
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struct op_struct *op = get_op_struct();
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if (op == NULL)
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return -ENOMEM;
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|
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get_dev_info(file->f_path.dentry->d_inode, &devi);
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|
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/*
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* We need to make sure we can send a request. We use
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* a semaphore to keep track of # requests in use. If
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* we are non-blocking, make sure we don't block on the
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* semaphore
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*/
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if (noblock) {
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if (down_trylock(&reqSem)) {
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ret = -EWOULDBLOCK;
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goto free_op;
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}
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} else
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down(&reqSem);
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|
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/* Allocate a DMA buffer */
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op->dev = tape_device[devi.devno];
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op->buffer = dma_alloc_coherent(op->dev, count, &op->dmaaddr,
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GFP_ATOMIC);
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|
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if (op->buffer == NULL) {
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printk(VIOTAPE_KERN_WARN
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"error allocating dma buffer for len %ld\n",
|
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count);
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ret = -EFAULT;
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goto up_sem;
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}
|
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|
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/* Copy the data into the buffer */
|
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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 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_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);
|
|
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,
|
|
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)
|
|
{
|
|
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);
|
|
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;
|
|
|
|
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 = {
|
|
{ "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;
|
|
struct proc_dir_entry *e;
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|