kernel-ark/drivers/cdrom/viocd.c
Arjan van de Ven 2b8693c061 [PATCH] mark struct file_operations const 3
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>
2007-02-12 09:48:45 -08:00

826 lines
21 KiB
C

/* -*- linux-c -*-
* drivers/cdrom/viocd.c
*
* iSeries Virtual CD Rom
*
* Authors: Dave Boutcher <boutcher@us.ibm.com>
* Ryan Arnold <ryanarn@us.ibm.com>
* Colin Devilbiss <devilbis@us.ibm.com>
* Stephen Rothwell <sfr@au1.ibm.com>
*
* (C) Copyright 2000-2004 IBM Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) anyu later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* This routine provides access to CD ROM drives owned and managed by an
* OS/400 partition running on the same box as this Linux partition.
*
* All operations are performed by sending messages back and forth to
* the OS/400 partition.
*/
#include <linux/major.h>
#include <linux/blkdev.h>
#include <linux/cdrom.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/completion.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/vio.h>
#include <asm/scatterlist.h>
#include <asm/iseries/hv_types.h>
#include <asm/iseries/hv_lp_event.h>
#include <asm/iseries/vio.h>
#include <asm/firmware.h>
#define VIOCD_DEVICE "iseries/vcd"
#define VIOCD_VERS "1.06"
#define VIOCD_KERN_WARNING KERN_WARNING "viocd: "
#define VIOCD_KERN_INFO KERN_INFO "viocd: "
struct viocdlpevent {
struct HvLpEvent event;
u32 reserved;
u16 version;
u16 sub_result;
u16 disk;
u16 flags;
u32 token;
u64 offset; /* On open, max number of disks */
u64 len; /* On open, size of the disk */
u32 block_size; /* Only set on open */
u32 media_size; /* Only set on open */
};
enum viocdsubtype {
viocdopen = 0x0001,
viocdclose = 0x0002,
viocdread = 0x0003,
viocdwrite = 0x0004,
viocdlockdoor = 0x0005,
viocdgetinfo = 0x0006,
viocdcheck = 0x0007
};
/*
* Should probably make this a module parameter....sigh
*/
#define VIOCD_MAX_CD HVMAXARCHITECTEDVIRTUALCDROMS
static const struct vio_error_entry viocd_err_table[] = {
{0x0201, EINVAL, "Invalid Range"},
{0x0202, EINVAL, "Invalid Token"},
{0x0203, EIO, "DMA Error"},
{0x0204, EIO, "Use Error"},
{0x0205, EIO, "Release Error"},
{0x0206, EINVAL, "Invalid CD"},
{0x020C, EROFS, "Read Only Device"},
{0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
{0x020E, EIO, "Optical System Error (Varied Off?)"},
{0x02FF, EIO, "Internal Error"},
{0x3010, EIO, "Changed Volume"},
{0xC100, EIO, "Optical System Error"},
{0x0000, 0, NULL},
};
/*
* This is the structure we use to exchange info between driver and interrupt
* handler
*/
struct viocd_waitevent {
struct completion com;
int rc;
u16 sub_result;
int changed;
};
/* this is a lookup table for the true capabilities of a device */
struct capability_entry {
char *type;
int capability;
};
static struct capability_entry capability_table[] __initdata = {
{ "6330", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
{ "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
{ "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
{ "632A", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
{ "6321", CDC_LOCK },
{ "632B", 0 },
{ NULL , CDC_LOCK },
};
/* These are our internal structures for keeping track of devices */
static int viocd_numdev;
struct cdrom_info {
char rsrcname[10];
char type[4];
char model[3];
};
/*
* This needs to be allocated since it is passed to the
* Hypervisor and we may be a module.
*/
static struct cdrom_info *viocd_unitinfo;
static dma_addr_t unitinfo_dmaaddr;
struct disk_info {
struct gendisk *viocd_disk;
struct cdrom_device_info viocd_info;
struct device *dev;
};
static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
#define DEVICE_NR(di) ((di) - &viocd_diskinfo[0])
static spinlock_t viocd_reqlock;
#define MAX_CD_REQ 1
/* procfs support */
static int proc_viocd_show(struct seq_file *m, void *v)
{
int i;
for (i = 0; i < viocd_numdev; i++) {
seq_printf(m, "viocd device %d is iSeries resource %10.10s"
"type %4.4s, model %3.3s\n",
i, viocd_unitinfo[i].rsrcname,
viocd_unitinfo[i].type,
viocd_unitinfo[i].model);
}
return 0;
}
static int proc_viocd_open(struct inode *inode, struct file *file)
{
return single_open(file, proc_viocd_show, NULL);
}
static const struct file_operations proc_viocd_operations = {
.open = proc_viocd_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int viocd_blk_open(struct inode *inode, struct file *file)
{
struct disk_info *di = inode->i_bdev->bd_disk->private_data;
return cdrom_open(&di->viocd_info, inode, file);
}
static int viocd_blk_release(struct inode *inode, struct file *file)
{
struct disk_info *di = inode->i_bdev->bd_disk->private_data;
return cdrom_release(&di->viocd_info, file);
}
static int viocd_blk_ioctl(struct inode *inode, struct file *file,
unsigned cmd, unsigned long arg)
{
struct disk_info *di = inode->i_bdev->bd_disk->private_data;
return cdrom_ioctl(file, &di->viocd_info, inode, cmd, arg);
}
static int viocd_blk_media_changed(struct gendisk *disk)
{
struct disk_info *di = disk->private_data;
return cdrom_media_changed(&di->viocd_info);
}
struct block_device_operations viocd_fops = {
.owner = THIS_MODULE,
.open = viocd_blk_open,
.release = viocd_blk_release,
.ioctl = viocd_blk_ioctl,
.media_changed = viocd_blk_media_changed,
};
/* Get info on CD devices from OS/400 */
static void __init get_viocd_info(void)
{
HvLpEvent_Rc hvrc;
int i;
struct viocd_waitevent we;
viocd_unitinfo = dma_alloc_coherent(iSeries_vio_dev,
sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
&unitinfo_dmaaddr, GFP_ATOMIC);
if (viocd_unitinfo == NULL) {
printk(VIOCD_KERN_WARNING "error allocating unitinfo\n");
return;
}
memset(viocd_unitinfo, 0, sizeof(*viocd_unitinfo) * VIOCD_MAX_CD);
init_completion(&we.com);
hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
HvLpEvent_Type_VirtualIo,
viomajorsubtype_cdio | viocdgetinfo,
HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
viopath_sourceinst(viopath_hostLp),
viopath_targetinst(viopath_hostLp),
(u64)&we, VIOVERSION << 16, unitinfo_dmaaddr, 0,
sizeof(*viocd_unitinfo) * VIOCD_MAX_CD, 0);
if (hvrc != HvLpEvent_Rc_Good) {
printk(VIOCD_KERN_WARNING "cdrom error sending event. rc %d\n",
(int)hvrc);
goto error_ret;
}
wait_for_completion(&we.com);
if (we.rc) {
const struct vio_error_entry *err =
vio_lookup_rc(viocd_err_table, we.sub_result);
printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on getinfo: %s\n",
we.rc, we.sub_result, err->msg);
goto error_ret;
}
for (i = 0; (i < VIOCD_MAX_CD) && viocd_unitinfo[i].rsrcname[0]; i++)
viocd_numdev++;
error_ret:
if (viocd_numdev == 0) {
dma_free_coherent(iSeries_vio_dev,
sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
viocd_unitinfo, unitinfo_dmaaddr);
viocd_unitinfo = NULL;
}
}
static int viocd_open(struct cdrom_device_info *cdi, int purpose)
{
struct disk_info *diskinfo = cdi->handle;
int device_no = DEVICE_NR(diskinfo);
HvLpEvent_Rc hvrc;
struct viocd_waitevent we;
init_completion(&we.com);
hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
HvLpEvent_Type_VirtualIo,
viomajorsubtype_cdio | viocdopen,
HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
viopath_sourceinst(viopath_hostLp),
viopath_targetinst(viopath_hostLp),
(u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
0, 0, 0);
if (hvrc != 0) {
printk(VIOCD_KERN_WARNING
"bad rc on HvCallEvent_signalLpEventFast %d\n",
(int)hvrc);
return -EIO;
}
wait_for_completion(&we.com);
if (we.rc) {
const struct vio_error_entry *err =
vio_lookup_rc(viocd_err_table, we.sub_result);
printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
we.rc, we.sub_result, err->msg);
return -err->errno;
}
return 0;
}
static void viocd_release(struct cdrom_device_info *cdi)
{
int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
HvLpEvent_Rc hvrc;
hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
HvLpEvent_Type_VirtualIo,
viomajorsubtype_cdio | viocdclose,
HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
viopath_sourceinst(viopath_hostLp),
viopath_targetinst(viopath_hostLp), 0,
VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
if (hvrc != 0)
printk(VIOCD_KERN_WARNING
"bad rc on HvCallEvent_signalLpEventFast %d\n",
(int)hvrc);
}
/* Send a read or write request to OS/400 */
static int send_request(struct request *req)
{
HvLpEvent_Rc hvrc;
struct disk_info *diskinfo = req->rq_disk->private_data;
u64 len;
dma_addr_t dmaaddr;
int direction;
u16 cmd;
struct scatterlist sg;
BUG_ON(req->nr_phys_segments > 1);
if (rq_data_dir(req) == READ) {
direction = DMA_FROM_DEVICE;
cmd = viomajorsubtype_cdio | viocdread;
} else {
direction = DMA_TO_DEVICE;
cmd = viomajorsubtype_cdio | viocdwrite;
}
if (blk_rq_map_sg(req->q, req, &sg) == 0) {
printk(VIOCD_KERN_WARNING
"error setting up scatter/gather list\n");
return -1;
}
if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
return -1;
}
dmaaddr = sg_dma_address(&sg);
len = sg_dma_len(&sg);
hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
HvLpEvent_Type_VirtualIo, cmd,
HvLpEvent_AckInd_DoAck,
HvLpEvent_AckType_ImmediateAck,
viopath_sourceinst(viopath_hostLp),
viopath_targetinst(viopath_hostLp),
(u64)req, VIOVERSION << 16,
((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
(u64)req->sector * 512, len, 0);
if (hvrc != HvLpEvent_Rc_Good) {
printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
return -1;
}
return 0;
}
static int rwreq;
static void do_viocd_request(request_queue_t *q)
{
struct request *req;
while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
if (!blk_fs_request(req))
end_request(req, 0);
else if (send_request(req) < 0) {
printk(VIOCD_KERN_WARNING
"unable to send message to OS/400!");
end_request(req, 0);
} else
rwreq++;
}
}
static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
{
struct viocd_waitevent we;
HvLpEvent_Rc hvrc;
int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
init_completion(&we.com);
/* Send the open event to OS/400 */
hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
HvLpEvent_Type_VirtualIo,
viomajorsubtype_cdio | viocdcheck,
HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
viopath_sourceinst(viopath_hostLp),
viopath_targetinst(viopath_hostLp),
(u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
0, 0, 0);
if (hvrc != 0) {
printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
(int)hvrc);
return -EIO;
}
wait_for_completion(&we.com);
/* Check the return code. If bad, assume no change */
if (we.rc) {
const struct vio_error_entry *err =
vio_lookup_rc(viocd_err_table, we.sub_result);
printk(VIOCD_KERN_WARNING
"bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
we.rc, we.sub_result, err->msg);
return 0;
}
return we.changed;
}
static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
{
HvLpEvent_Rc hvrc;
u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
/* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
u64 flags = !!locking;
struct viocd_waitevent we;
init_completion(&we.com);
/* Send the lockdoor event to OS/400 */
hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
HvLpEvent_Type_VirtualIo,
viomajorsubtype_cdio | viocdlockdoor,
HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
viopath_sourceinst(viopath_hostLp),
viopath_targetinst(viopath_hostLp),
(u64)&we, VIOVERSION << 16,
(device_no << 48) | (flags << 32), 0, 0, 0);
if (hvrc != 0) {
printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
(int)hvrc);
return -EIO;
}
wait_for_completion(&we.com);
if (we.rc != 0)
return -EIO;
return 0;
}
static int viocd_packet(struct cdrom_device_info *cdi,
struct packet_command *cgc)
{
unsigned int buflen = cgc->buflen;
int ret = -EIO;
switch (cgc->cmd[0]) {
case GPCMD_READ_DISC_INFO:
{
disc_information *di = (disc_information *)cgc->buffer;
if (buflen >= 2) {
di->disc_information_length = cpu_to_be16(1);
ret = 0;
}
if (buflen >= 3)
di->erasable =
(cdi->ops->capability & ~cdi->mask
& (CDC_DVD_RAM | CDC_RAM)) != 0;
}
break;
case GPCMD_GET_CONFIGURATION:
if (cgc->cmd[3] == CDF_RWRT) {
struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
if ((buflen >=
(sizeof(struct feature_header) + sizeof(*rfd))) &&
(cdi->ops->capability & ~cdi->mask
& (CDC_DVD_RAM | CDC_RAM))) {
rfd->feature_code = cpu_to_be16(CDF_RWRT);
rfd->curr = 1;
ret = 0;
}
}
break;
default:
if (cgc->sense) {
/* indicate Unknown code */
cgc->sense->sense_key = 0x05;
cgc->sense->asc = 0x20;
cgc->sense->ascq = 0x00;
}
break;
}
cgc->stat = ret;
return ret;
}
static void restart_all_queues(int first_index)
{
int i;
for (i = first_index + 1; i < viocd_numdev; i++)
if (viocd_diskinfo[i].viocd_disk)
blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
for (i = 0; i <= first_index; i++)
if (viocd_diskinfo[i].viocd_disk)
blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
}
/* This routine handles incoming CD LP events */
static void vio_handle_cd_event(struct HvLpEvent *event)
{
struct viocdlpevent *bevent;
struct viocd_waitevent *pwe;
struct disk_info *di;
unsigned long flags;
struct request *req;
if (event == NULL)
/* Notification that a partition went away! */
return;
/* First, we should NEVER get an int here...only acks */
if (hvlpevent_is_int(event)) {
printk(VIOCD_KERN_WARNING
"Yikes! got an int in viocd event handler!\n");
if (hvlpevent_need_ack(event)) {
event->xRc = HvLpEvent_Rc_InvalidSubtype;
HvCallEvent_ackLpEvent(event);
}
}
bevent = (struct viocdlpevent *)event;
switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
case viocdopen:
if (event->xRc == 0) {
di = &viocd_diskinfo[bevent->disk];
blk_queue_hardsect_size(di->viocd_disk->queue,
bevent->block_size);
set_capacity(di->viocd_disk,
bevent->media_size *
bevent->block_size / 512);
}
/* FALLTHROUGH !! */
case viocdgetinfo:
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);
printk(VIOCD_KERN_WARNING "request %p failed "
"with rc %d:0x%04X: %s\n",
req, event->xRc,
bevent->sub_result, err->msg);
end_request(req, 0);
} else
end_request(req, 1);
/* restart handling of incoming requests */
spin_unlock_irqrestore(&viocd_reqlock, flags);
restart_all_queues(bevent->disk);
break;
default:
printk(VIOCD_KERN_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 struct cdrom_device_ops viocd_dops = {
.open = viocd_open,
.release = viocd_release,
.media_changed = viocd_media_changed,
.lock_door = viocd_lock_door,
.generic_packet = viocd_packet,
.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 __init 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 cdrom_info *ci;
struct request_queue *q;
deviceno = vdev->unit_address;
if (deviceno >= viocd_numdev)
return -ENODEV;
d = &viocd_diskinfo[deviceno];
c = &d->viocd_info;
ci = &viocd_unitinfo[deviceno];
c->ops = &viocd_dops;
c->speed = 4;
c->capacity = 1;
c->handle = d;
c->mask = ~find_capability(ci->type);
sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
if (register_cdrom(c) != 0) {
printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
c->name);
goto out;
}
printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
"type %4.4s, model %3.3s\n",
c->name, ci->rsrcname, ci->type, ci->model);
q = blk_init_queue(do_viocd_request, &viocd_reqlock);
if (q == NULL) {
printk(VIOCD_KERN_WARNING "Cannot allocate queue for %s!\n",
c->name);
goto out_unregister_cdrom;
}
gendisk = alloc_disk(1);
if (gendisk == NULL) {
printk(VIOCD_KERN_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_hw_segments(q, 1);
blk_queue_max_phys_segments(q, 1);
blk_queue_max_sectors(q, 4096 / 512);
gendisk->queue = q;
gendisk->fops = &viocd_fops;
gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
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];
if (unregister_cdrom(&d->viocd_info) != 0)
printk(VIOCD_KERN_WARNING
"Cannot unregister viocd CD-ROM %s!\n",
d->viocd_info.name);
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)
{
struct proc_dir_entry *e;
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;
}
printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
viopath_hostLp);
if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
printk(VIOCD_KERN_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) {
printk(VIOCD_KERN_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);
get_viocd_info();
spin_lock_init(&viocd_reqlock);
ret = vio_register_driver(&viocd_driver);
if (ret)
goto out_free_info;
e = create_proc_entry("iSeries/viocd", S_IFREG|S_IRUGO, NULL);
if (e) {
e->owner = THIS_MODULE;
e->proc_fops = &proc_viocd_operations;
}
return 0;
out_free_info:
dma_free_coherent(iSeries_vio_dev,
sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
viocd_unitinfo, unitinfo_dmaaddr);
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);
if (viocd_unitinfo != NULL)
dma_free_coherent(iSeries_vio_dev,
sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
viocd_unitinfo, unitinfo_dmaaddr);
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");