/* -*- 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 <linux/scatterlist.h> #include <asm/vio.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: " /* * 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 disk_info { struct gendisk *viocd_disk; struct cdrom_device_info viocd_info; struct device *dev; const char *rsrcname; const char *type; const char *model; }; 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_diskinfo[i].rsrcname, viocd_diskinfo[i].type, viocd_diskinfo[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, }; 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; } sg_init_table(&sg, 1); 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 void viocd_end_request(struct request *req, int error) { int nsectors = req->hard_nr_sectors; /* * Make sure it's fully ended, and ensure that we process * at least one sector. */ if (blk_pc_request(req)) nsectors = (req->data_len + 511) >> 9; if (!nsectors) nsectors = 1; if (__blk_end_request(req, error, nsectors << 9)) BUG(); } static int rwreq; static void do_viocd_request(struct request_queue *q) { struct request *req; while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) { if (!blk_fs_request(req)) viocd_end_request(req, -EIO); else if (send_request(req) < 0) { printk(VIOCD_KERN_WARNING "unable to send message to OS/400!"); viocd_end_request(req, -EIO); } 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 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); viocd_end_request(req, -EIO); } else viocd_end_request(req, 0); /* 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 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.archdata.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) { 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, d->rsrcname, d->type, d->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]; 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) { 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); 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: 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");