![Tejun Heo](/assets/img/avatar_default.png)
Disk event code automatically blocks events on excl write. This is primarily to avoid issuing polling commands while burning is in progress. This behavior doesn't fit other types of devices with removeable media where polling commands don't have adverse side effects and door locking usually doesn't exist. This patch introduces new genhd flag which controls the auto-blocking behavior and uses it to enable auto-blocking only on optical devices. Note for stable: 2.6.38 and later only Cc: stable@kernel.org Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
741 lines
19 KiB
C
741 lines
19 KiB
C
/* -*- linux-c -*-
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* drivers/cdrom/viocd.c
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*
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* iSeries Virtual CD Rom
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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
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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 CD ROM drives owned and managed by an
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* OS/400 partition running on the same box as this Linux partition.
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*
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* All operations are performed by sending messages back and forth to
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* the OS/400 partition.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/major.h>
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#include <linux/blkdev.h>
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#include <linux/cdrom.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/dma-mapping.h>
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#include <linux/module.h>
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#include <linux/completion.h>
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#include <linux/proc_fs.h>
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#include <linux/mutex.h>
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#include <linux/seq_file.h>
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#include <linux/scatterlist.h>
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#include <asm/vio.h>
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#include <asm/iseries/hv_types.h>
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#include <asm/iseries/hv_lp_event.h>
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#include <asm/iseries/vio.h>
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#include <asm/firmware.h>
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#define VIOCD_DEVICE "iseries/vcd"
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#define VIOCD_VERS "1.06"
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/*
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* Should probably make this a module parameter....sigh
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*/
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#define VIOCD_MAX_CD HVMAXARCHITECTEDVIRTUALCDROMS
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static DEFINE_MUTEX(viocd_mutex);
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static const struct vio_error_entry viocd_err_table[] = {
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{0x0201, EINVAL, "Invalid Range"},
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{0x0202, EINVAL, "Invalid Token"},
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{0x0203, EIO, "DMA Error"},
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{0x0204, EIO, "Use Error"},
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{0x0205, EIO, "Release Error"},
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{0x0206, EINVAL, "Invalid CD"},
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{0x020C, EROFS, "Read Only Device"},
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{0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
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{0x020E, EIO, "Optical System Error (Varied Off?)"},
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{0x02FF, EIO, "Internal Error"},
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{0x3010, EIO, "Changed Volume"},
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{0xC100, EIO, "Optical System Error"},
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{0x0000, 0, NULL},
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};
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/*
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* This is the structure we use to exchange info between driver and interrupt
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* handler
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*/
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struct viocd_waitevent {
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struct completion com;
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int rc;
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u16 sub_result;
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int changed;
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};
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/* this is a lookup table for the true capabilities of a device */
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struct capability_entry {
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char *type;
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int capability;
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};
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static struct capability_entry capability_table[] __initdata = {
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{ "6330", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
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{ "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
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{ "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
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{ "632A", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
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{ "6321", CDC_LOCK },
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{ "632B", 0 },
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{ NULL , CDC_LOCK },
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};
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/* These are our internal structures for keeping track of devices */
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static int viocd_numdev;
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struct disk_info {
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struct gendisk *viocd_disk;
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struct cdrom_device_info viocd_info;
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struct device *dev;
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const char *rsrcname;
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const char *type;
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const char *model;
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};
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static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
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#define DEVICE_NR(di) ((di) - &viocd_diskinfo[0])
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static spinlock_t viocd_reqlock;
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#define MAX_CD_REQ 1
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/* procfs support */
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static int proc_viocd_show(struct seq_file *m, void *v)
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{
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int i;
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for (i = 0; i < viocd_numdev; i++) {
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seq_printf(m, "viocd device %d is iSeries resource %10.10s"
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"type %4.4s, model %3.3s\n",
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i, viocd_diskinfo[i].rsrcname,
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viocd_diskinfo[i].type,
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viocd_diskinfo[i].model);
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}
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return 0;
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}
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static int proc_viocd_open(struct inode *inode, struct file *file)
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{
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return single_open(file, proc_viocd_show, NULL);
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}
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static const struct file_operations proc_viocd_operations = {
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.owner = THIS_MODULE,
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.open = proc_viocd_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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static int viocd_blk_open(struct block_device *bdev, fmode_t mode)
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{
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struct disk_info *di = bdev->bd_disk->private_data;
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int ret;
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mutex_lock(&viocd_mutex);
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ret = cdrom_open(&di->viocd_info, bdev, mode);
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mutex_unlock(&viocd_mutex);
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return ret;
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}
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static int viocd_blk_release(struct gendisk *disk, fmode_t mode)
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{
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struct disk_info *di = disk->private_data;
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mutex_lock(&viocd_mutex);
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cdrom_release(&di->viocd_info, mode);
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mutex_unlock(&viocd_mutex);
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return 0;
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}
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static int viocd_blk_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned cmd, unsigned long arg)
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{
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struct disk_info *di = bdev->bd_disk->private_data;
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int ret;
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mutex_lock(&viocd_mutex);
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ret = cdrom_ioctl(&di->viocd_info, bdev, mode, cmd, arg);
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mutex_unlock(&viocd_mutex);
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return ret;
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}
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static unsigned int viocd_blk_check_events(struct gendisk *disk,
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unsigned int clearing)
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{
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struct disk_info *di = disk->private_data;
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return cdrom_check_events(&di->viocd_info, clearing);
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}
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static const struct block_device_operations viocd_fops = {
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.owner = THIS_MODULE,
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.open = viocd_blk_open,
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.release = viocd_blk_release,
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.ioctl = viocd_blk_ioctl,
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.check_events = viocd_blk_check_events,
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};
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static int viocd_open(struct cdrom_device_info *cdi, int purpose)
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{
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struct disk_info *diskinfo = cdi->handle;
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int device_no = DEVICE_NR(diskinfo);
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HvLpEvent_Rc hvrc;
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struct viocd_waitevent we;
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init_completion(&we.com);
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hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
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HvLpEvent_Type_VirtualIo,
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viomajorsubtype_cdio | viocdopen,
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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)&we, VIOVERSION << 16, ((u64)device_no << 48),
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0, 0, 0);
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if (hvrc != 0) {
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pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
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(int)hvrc);
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return -EIO;
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}
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wait_for_completion(&we.com);
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if (we.rc) {
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const struct vio_error_entry *err =
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vio_lookup_rc(viocd_err_table, we.sub_result);
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pr_warning("bad rc %d:0x%04X on open: %s\n",
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we.rc, we.sub_result, err->msg);
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return -err->errno;
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}
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return 0;
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}
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static void viocd_release(struct cdrom_device_info *cdi)
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{
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int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
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HvLpEvent_Rc hvrc;
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hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
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HvLpEvent_Type_VirtualIo,
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viomajorsubtype_cdio | viocdclose,
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HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
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viopath_sourceinst(viopath_hostLp),
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viopath_targetinst(viopath_hostLp), 0,
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VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
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if (hvrc != 0)
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pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
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(int)hvrc);
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}
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/* Send a read or write request to OS/400 */
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static int send_request(struct request *req)
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{
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HvLpEvent_Rc hvrc;
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struct disk_info *diskinfo = req->rq_disk->private_data;
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u64 len;
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dma_addr_t dmaaddr;
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int direction;
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u16 cmd;
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struct scatterlist sg;
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BUG_ON(req->nr_phys_segments > 1);
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if (rq_data_dir(req) == READ) {
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direction = DMA_FROM_DEVICE;
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cmd = viomajorsubtype_cdio | viocdread;
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} else {
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direction = DMA_TO_DEVICE;
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cmd = viomajorsubtype_cdio | viocdwrite;
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}
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sg_init_table(&sg, 1);
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if (blk_rq_map_sg(req->q, req, &sg) == 0) {
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pr_warning("error setting up scatter/gather list\n");
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return -1;
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}
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if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
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pr_warning("error allocating sg tce\n");
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return -1;
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}
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dmaaddr = sg_dma_address(&sg);
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len = sg_dma_len(&sg);
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hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
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HvLpEvent_Type_VirtualIo, cmd,
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HvLpEvent_AckInd_DoAck,
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HvLpEvent_AckType_ImmediateAck,
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viopath_sourceinst(viopath_hostLp),
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viopath_targetinst(viopath_hostLp),
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(u64)req, VIOVERSION << 16,
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((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
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(u64)blk_rq_pos(req) * 512, len, 0);
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if (hvrc != HvLpEvent_Rc_Good) {
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pr_warning("hv error on op %d\n", (int)hvrc);
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return -1;
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}
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return 0;
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}
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static int rwreq;
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static void do_viocd_request(struct request_queue *q)
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{
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struct request *req;
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while ((rwreq == 0) && ((req = blk_fetch_request(q)) != NULL)) {
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if (req->cmd_type != REQ_TYPE_FS)
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__blk_end_request_all(req, -EIO);
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else if (send_request(req) < 0) {
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pr_warning("unable to send message to OS/400!\n");
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__blk_end_request_all(req, -EIO);
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} else
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rwreq++;
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}
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}
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static unsigned int viocd_check_events(struct cdrom_device_info *cdi,
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unsigned int clearing, int disc_nr)
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{
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struct viocd_waitevent we;
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HvLpEvent_Rc hvrc;
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int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
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init_completion(&we.com);
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/* Send the open event to OS/400 */
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hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
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HvLpEvent_Type_VirtualIo,
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viomajorsubtype_cdio | viocdcheck,
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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)&we, VIOVERSION << 16, ((u64)device_no << 48),
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0, 0, 0);
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if (hvrc != 0) {
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pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
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(int)hvrc);
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return 0;
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}
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wait_for_completion(&we.com);
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/* Check the return code. If bad, assume no change */
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if (we.rc) {
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const struct vio_error_entry *err =
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vio_lookup_rc(viocd_err_table, we.sub_result);
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pr_warning("bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
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we.rc, we.sub_result, err->msg);
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return 0;
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}
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return we.changed ? DISK_EVENT_MEDIA_CHANGE : 0;
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}
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static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
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{
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HvLpEvent_Rc hvrc;
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u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
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/* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
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u64 flags = !!locking;
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struct viocd_waitevent we;
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init_completion(&we.com);
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/* Send the lockdoor event to OS/400 */
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hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
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HvLpEvent_Type_VirtualIo,
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viomajorsubtype_cdio | viocdlockdoor,
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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)&we, VIOVERSION << 16,
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(device_no << 48) | (flags << 32), 0, 0, 0);
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if (hvrc != 0) {
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pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
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(int)hvrc);
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return -EIO;
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}
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wait_for_completion(&we.com);
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if (we.rc != 0)
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return -EIO;
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return 0;
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}
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static int viocd_packet(struct cdrom_device_info *cdi,
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struct packet_command *cgc)
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{
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unsigned int buflen = cgc->buflen;
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int ret = -EIO;
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switch (cgc->cmd[0]) {
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case GPCMD_READ_DISC_INFO:
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{
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disc_information *di = (disc_information *)cgc->buffer;
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if (buflen >= 2) {
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di->disc_information_length = cpu_to_be16(1);
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ret = 0;
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}
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if (buflen >= 3)
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di->erasable =
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(cdi->ops->capability & ~cdi->mask
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& (CDC_DVD_RAM | CDC_RAM)) != 0;
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}
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break;
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case GPCMD_GET_CONFIGURATION:
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if (cgc->cmd[3] == CDF_RWRT) {
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struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
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if ((buflen >=
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(sizeof(struct feature_header) + sizeof(*rfd))) &&
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(cdi->ops->capability & ~cdi->mask
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& (CDC_DVD_RAM | CDC_RAM))) {
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rfd->feature_code = cpu_to_be16(CDF_RWRT);
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rfd->curr = 1;
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ret = 0;
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}
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}
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break;
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default:
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if (cgc->sense) {
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/* indicate Unknown code */
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cgc->sense->sense_key = 0x05;
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cgc->sense->asc = 0x20;
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cgc->sense->ascq = 0x00;
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}
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break;
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}
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cgc->stat = ret;
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return ret;
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}
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static void restart_all_queues(int first_index)
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{
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int i;
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for (i = first_index + 1; i < viocd_numdev; i++)
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if (viocd_diskinfo[i].viocd_disk)
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blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
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for (i = 0; i <= first_index; i++)
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if (viocd_diskinfo[i].viocd_disk)
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blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
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}
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/* This routine handles incoming CD LP events */
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static void vio_handle_cd_event(struct HvLpEvent *event)
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{
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struct viocdlpevent *bevent;
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struct viocd_waitevent *pwe;
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struct disk_info *di;
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unsigned long flags;
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struct request *req;
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if (event == NULL)
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/* Notification that a partition went away! */
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return;
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/* First, we should NEVER get an int here...only acks */
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if (hvlpevent_is_int(event)) {
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pr_warning("Yikes! got an int in viocd event handler!\n");
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if (hvlpevent_need_ack(event)) {
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event->xRc = HvLpEvent_Rc_InvalidSubtype;
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HvCallEvent_ackLpEvent(event);
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}
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}
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|
bevent = (struct viocdlpevent *)event;
|
|
|
|
switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
|
|
case viocdopen:
|
|
if (event->xRc == 0) {
|
|
di = &viocd_diskinfo[bevent->disk];
|
|
blk_queue_logical_block_size(di->viocd_disk->queue,
|
|
bevent->block_size);
|
|
set_capacity(di->viocd_disk,
|
|
bevent->media_size *
|
|
bevent->block_size / 512);
|
|
}
|
|
/* FALLTHROUGH !! */
|
|
case viocdlockdoor:
|
|
pwe = (struct viocd_waitevent *)event->xCorrelationToken;
|
|
return_complete:
|
|
pwe->rc = event->xRc;
|
|
pwe->sub_result = bevent->sub_result;
|
|
complete(&pwe->com);
|
|
break;
|
|
|
|
case viocdcheck:
|
|
pwe = (struct viocd_waitevent *)event->xCorrelationToken;
|
|
pwe->changed = bevent->flags;
|
|
goto return_complete;
|
|
|
|
case viocdclose:
|
|
break;
|
|
|
|
case viocdwrite:
|
|
case viocdread:
|
|
/*
|
|
* Since this is running in interrupt mode, we need to
|
|
* make sure we're not stepping on any global I/O operations
|
|
*/
|
|
di = &viocd_diskinfo[bevent->disk];
|
|
spin_lock_irqsave(&viocd_reqlock, flags);
|
|
dma_unmap_single(di->dev, bevent->token, bevent->len,
|
|
((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
|
|
? DMA_FROM_DEVICE : DMA_TO_DEVICE);
|
|
req = (struct request *)bevent->event.xCorrelationToken;
|
|
rwreq--;
|
|
|
|
if (event->xRc != HvLpEvent_Rc_Good) {
|
|
const struct vio_error_entry *err =
|
|
vio_lookup_rc(viocd_err_table,
|
|
bevent->sub_result);
|
|
pr_warning("request %p failed with rc %d:0x%04X: %s\n",
|
|
req, event->xRc,
|
|
bevent->sub_result, err->msg);
|
|
__blk_end_request_all(req, -EIO);
|
|
} else
|
|
__blk_end_request_all(req, 0);
|
|
|
|
/* restart handling of incoming requests */
|
|
spin_unlock_irqrestore(&viocd_reqlock, flags);
|
|
restart_all_queues(bevent->disk);
|
|
break;
|
|
|
|
default:
|
|
pr_warning("message with invalid subtype %0x04X!\n",
|
|
event->xSubtype & VIOMINOR_SUBTYPE_MASK);
|
|
if (hvlpevent_need_ack(event)) {
|
|
event->xRc = HvLpEvent_Rc_InvalidSubtype;
|
|
HvCallEvent_ackLpEvent(event);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int viocd_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
|
|
void *arg)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static struct cdrom_device_ops viocd_dops = {
|
|
.open = viocd_open,
|
|
.release = viocd_release,
|
|
.check_events = viocd_check_events,
|
|
.lock_door = viocd_lock_door,
|
|
.generic_packet = viocd_packet,
|
|
.audio_ioctl = viocd_audio_ioctl,
|
|
.capability = CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | CDC_PLAY_AUDIO | CDC_RESET | CDC_DRIVE_STATUS | CDC_GENERIC_PACKET | CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_RAM
|
|
};
|
|
|
|
static int find_capability(const char *type)
|
|
{
|
|
struct capability_entry *entry;
|
|
|
|
for(entry = capability_table; entry->type; ++entry)
|
|
if(!strncmp(entry->type, type, 4))
|
|
break;
|
|
return entry->capability;
|
|
}
|
|
|
|
static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
|
|
{
|
|
struct gendisk *gendisk;
|
|
int deviceno;
|
|
struct disk_info *d;
|
|
struct cdrom_device_info *c;
|
|
struct request_queue *q;
|
|
struct device_node *node = vdev->dev.of_node;
|
|
|
|
deviceno = vdev->unit_address;
|
|
if (deviceno >= VIOCD_MAX_CD)
|
|
return -ENODEV;
|
|
if (!node)
|
|
return -ENODEV;
|
|
|
|
if (deviceno >= viocd_numdev)
|
|
viocd_numdev = deviceno + 1;
|
|
|
|
d = &viocd_diskinfo[deviceno];
|
|
d->rsrcname = of_get_property(node, "linux,vio_rsrcname", NULL);
|
|
d->type = of_get_property(node, "linux,vio_type", NULL);
|
|
d->model = of_get_property(node, "linux,vio_model", NULL);
|
|
|
|
c = &d->viocd_info;
|
|
|
|
c->ops = &viocd_dops;
|
|
c->speed = 4;
|
|
c->capacity = 1;
|
|
c->handle = d;
|
|
c->mask = ~find_capability(d->type);
|
|
sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
|
|
|
|
if (register_cdrom(c) != 0) {
|
|
pr_warning("Cannot register viocd CD-ROM %s!\n", c->name);
|
|
goto out;
|
|
}
|
|
pr_info("cd %s is iSeries resource %10.10s type %4.4s, model %3.3s\n",
|
|
c->name, d->rsrcname, d->type, d->model);
|
|
q = blk_init_queue(do_viocd_request, &viocd_reqlock);
|
|
if (q == NULL) {
|
|
pr_warning("Cannot allocate queue for %s!\n", c->name);
|
|
goto out_unregister_cdrom;
|
|
}
|
|
gendisk = alloc_disk(1);
|
|
if (gendisk == NULL) {
|
|
pr_warning("Cannot create gendisk for %s!\n", c->name);
|
|
goto out_cleanup_queue;
|
|
}
|
|
gendisk->major = VIOCD_MAJOR;
|
|
gendisk->first_minor = deviceno;
|
|
strncpy(gendisk->disk_name, c->name,
|
|
sizeof(gendisk->disk_name));
|
|
blk_queue_max_segments(q, 1);
|
|
blk_queue_max_hw_sectors(q, 4096 / 512);
|
|
gendisk->queue = q;
|
|
gendisk->fops = &viocd_fops;
|
|
gendisk->flags = GENHD_FL_CD | GENHD_FL_REMOVABLE |
|
|
GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
|
|
gendisk->events = DISK_EVENT_MEDIA_CHANGE;
|
|
set_capacity(gendisk, 0);
|
|
gendisk->private_data = d;
|
|
d->viocd_disk = gendisk;
|
|
d->dev = &vdev->dev;
|
|
gendisk->driverfs_dev = d->dev;
|
|
add_disk(gendisk);
|
|
return 0;
|
|
|
|
out_cleanup_queue:
|
|
blk_cleanup_queue(q);
|
|
out_unregister_cdrom:
|
|
unregister_cdrom(c);
|
|
out:
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int viocd_remove(struct vio_dev *vdev)
|
|
{
|
|
struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
|
|
|
|
unregister_cdrom(&d->viocd_info);
|
|
del_gendisk(d->viocd_disk);
|
|
blk_cleanup_queue(d->viocd_disk->queue);
|
|
put_disk(d->viocd_disk);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* viocd_device_table: Used by vio.c to match devices that we
|
|
* support.
|
|
*/
|
|
static struct vio_device_id viocd_device_table[] __devinitdata = {
|
|
{ "block", "IBM,iSeries-viocd" },
|
|
{ "", "" }
|
|
};
|
|
MODULE_DEVICE_TABLE(vio, viocd_device_table);
|
|
|
|
static struct vio_driver viocd_driver = {
|
|
.id_table = viocd_device_table,
|
|
.probe = viocd_probe,
|
|
.remove = viocd_remove,
|
|
.driver = {
|
|
.name = "viocd",
|
|
.owner = THIS_MODULE,
|
|
}
|
|
};
|
|
|
|
static int __init viocd_init(void)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!firmware_has_feature(FW_FEATURE_ISERIES))
|
|
return -ENODEV;
|
|
|
|
if (viopath_hostLp == HvLpIndexInvalid) {
|
|
vio_set_hostlp();
|
|
/* If we don't have a host, bail out */
|
|
if (viopath_hostLp == HvLpIndexInvalid)
|
|
return -ENODEV;
|
|
}
|
|
|
|
pr_info("vers " VIOCD_VERS ", hosting partition %d\n", viopath_hostLp);
|
|
|
|
if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
|
|
pr_warning("Unable to get major %d for %s\n",
|
|
VIOCD_MAJOR, VIOCD_DEVICE);
|
|
return -EIO;
|
|
}
|
|
|
|
ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
|
|
MAX_CD_REQ + 2);
|
|
if (ret) {
|
|
pr_warning("error opening path to host partition %d\n",
|
|
viopath_hostLp);
|
|
goto out_unregister;
|
|
}
|
|
|
|
/* Initialize our request handler */
|
|
vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
|
|
|
|
spin_lock_init(&viocd_reqlock);
|
|
|
|
ret = vio_register_driver(&viocd_driver);
|
|
if (ret)
|
|
goto out_free_info;
|
|
|
|
proc_create("iSeries/viocd", S_IFREG|S_IRUGO, NULL,
|
|
&proc_viocd_operations);
|
|
return 0;
|
|
|
|
out_free_info:
|
|
vio_clearHandler(viomajorsubtype_cdio);
|
|
viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
|
|
out_unregister:
|
|
unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit viocd_exit(void)
|
|
{
|
|
remove_proc_entry("iSeries/viocd", NULL);
|
|
vio_unregister_driver(&viocd_driver);
|
|
viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
|
|
vio_clearHandler(viomajorsubtype_cdio);
|
|
unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
|
|
}
|
|
|
|
module_init(viocd_init);
|
|
module_exit(viocd_exit);
|
|
MODULE_LICENSE("GPL");
|