diff options
Diffstat (limited to 'drivers/block/ub.c')
| -rw-r--r-- | drivers/block/ub.c | 598 |
1 files changed, 363 insertions, 235 deletions
diff --git a/drivers/block/ub.c b/drivers/block/ub.c index ce42889..adc4dcc 100644 --- a/drivers/block/ub.c +++ b/drivers/block/ub.c @@ -8,13 +8,12 @@ * and is not licensed separately. See file COPYING for details. * * TODO (sorted by decreasing priority) + * -- Kill first_open (Al Viro fixed the block layer now) * -- Do resets with usb_device_reset (needs a thread context, use khubd) * -- set readonly flag for CDs, set removable flag for CF readers * -- do inquiry and verify we got a disk and not a tape (for LUN mismatch) - * -- support pphaneuf's SDDR-75 with two LUNs (also broken capacity...) * -- special case some senses, e.g. 3a/0 -> no media present, reduce retries * -- verify the 13 conditions and do bulk resets - * -- normal pool of commands instead of cmdv[]? * -- kill last_pipe and simply do two-state clearing on both pipes * -- verify protocol (bulk) from USB descriptors (maybe...) * -- highmem and sg @@ -49,7 +48,14 @@ #define US_SC_SCSI 0x06 /* Transparent */ /* + * This many LUNs per USB device. + * Every one of them takes a host, see UB_MAX_HOSTS. */ +#define UB_MAX_LUNS 4 + +/* + */ + #define UB_MINORS_PER_MAJOR 8 #define UB_MAX_CDB_SIZE 16 /* Corresponds to Bulk */ @@ -65,7 +71,7 @@ struct bulk_cb_wrap { u32 Tag; /* unique per command id */ __le32 DataTransferLength; /* size of data */ u8 Flags; /* direction in bit 0 */ - u8 Lun; /* LUN normally 0 */ + u8 Lun; /* LUN */ u8 Length; /* of of the CDB */ u8 CDB[UB_MAX_CDB_SIZE]; /* max command */ }; @@ -168,6 +174,7 @@ struct ub_scsi_cmd { unsigned int len; /* Requested length */ // struct scatterlist sgv[UB_MAX_REQ_SG]; + struct ub_lun *lun; void (*done)(struct ub_dev *, struct ub_scsi_cmd *); void *back; }; @@ -252,25 +259,47 @@ struct ub_scsi_cmd_queue { }; /* - * The UB device instance. + * The block device instance (one per LUN). + */ +struct ub_lun { + struct ub_dev *udev; + struct list_head link; + struct gendisk *disk; + int id; /* Host index */ + int num; /* LUN number */ + char name[16]; + + int changed; /* Media was changed */ + int removable; + int readonly; + int first_open; /* Kludge. See ub_bd_open. */ + + /* Use Ingo's mempool if or when we have more than one command. */ + /* + * Currently we never need more than one command for the whole device. + * However, giving every LUN a command is a cheap and automatic way + * to enforce fairness between them. + */ + int cmda[1]; + struct ub_scsi_cmd cmdv[1]; + + struct ub_capacity capacity; +}; + +/* + * The USB device instance. */ struct ub_dev { spinlock_t lock; - int id; /* Number among ub's */ atomic_t poison; /* The USB device is disconnected */ int openc; /* protected by ub_lock! */ /* kref is too implicit for our taste */ unsigned int tagcnt; - int changed; /* Media was changed */ - int removable; - int readonly; - int first_open; /* Kludge. See ub_bd_open. */ - char name[8]; + char name[12]; struct usb_device *dev; struct usb_interface *intf; - struct ub_capacity capacity; - struct gendisk *disk; + struct list_head luns; unsigned int send_bulk_pipe; /* cached pipe values */ unsigned int recv_bulk_pipe; @@ -279,10 +308,6 @@ struct ub_dev { struct tasklet_struct tasklet; - /* XXX Use Ingo's mempool (once we have more than one) */ - int cmda[1]; - struct ub_scsi_cmd cmdv[1]; - struct ub_scsi_cmd_queue cmd_queue; struct ub_scsi_cmd top_rqs_cmd; /* REQUEST SENSE */ unsigned char top_sense[UB_SENSE_SIZE]; @@ -301,9 +326,9 @@ struct ub_dev { /* */ static void ub_cleanup(struct ub_dev *sc); -static int ub_bd_rq_fn_1(struct ub_dev *sc, struct request *rq); -static int ub_cmd_build_block(struct ub_dev *sc, struct ub_scsi_cmd *cmd, - struct request *rq); +static int ub_bd_rq_fn_1(struct ub_lun *lun, struct request *rq); +static int ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun, + struct ub_scsi_cmd *cmd, struct request *rq); static int ub_cmd_build_packet(struct ub_dev *sc, struct ub_scsi_cmd *cmd, struct request *rq); static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd); @@ -320,8 +345,10 @@ static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd); static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int stalled_pipe); static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd); -static int ub_sync_tur(struct ub_dev *sc); -static int ub_sync_read_cap(struct ub_dev *sc, struct ub_capacity *ret); +static int ub_sync_tur(struct ub_dev *sc, struct ub_lun *lun); +static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun, + struct ub_capacity *ret); +static int ub_probe_lun(struct ub_dev *sc, int lnum); /* */ @@ -342,6 +369,7 @@ MODULE_DEVICE_TABLE(usb, ub_usb_ids); */ #define UB_MAX_HOSTS 26 static char ub_hostv[UB_MAX_HOSTS]; + static DEFINE_SPINLOCK(ub_lock); /* Locks globals and ->openc */ /* @@ -406,6 +434,8 @@ static ssize_t ub_diag_show(struct device *dev, char *page) { struct usb_interface *intf; struct ub_dev *sc; + struct list_head *p; + struct ub_lun *lun; int cnt; unsigned long flags; int nc, nh; @@ -421,9 +451,15 @@ static ssize_t ub_diag_show(struct device *dev, char *page) spin_lock_irqsave(&sc->lock, flags); cnt += sprintf(page + cnt, - "qlen %d qmax %d changed %d removable %d readonly %d\n", - sc->cmd_queue.qlen, sc->cmd_queue.qmax, - sc->changed, sc->removable, sc->readonly); + "qlen %d qmax %d\n", + sc->cmd_queue.qlen, sc->cmd_queue.qmax); + + list_for_each (p, &sc->luns) { + lun = list_entry(p, struct ub_lun, link); + cnt += sprintf(page + cnt, + "lun %u changed %d removable %d readonly %d\n", + lun->num, lun->changed, lun->removable, lun->readonly); + } if ((nc = sc->tr.cur + 1) == SCMD_TRACE_SZ) nc = 0; for (j = 0; j < SCMD_TRACE_SZ; j++) { @@ -523,53 +559,63 @@ static void ub_put(struct ub_dev *sc) */ static void ub_cleanup(struct ub_dev *sc) { + struct list_head *p; + struct ub_lun *lun; request_queue_t *q; - /* I don't think queue can be NULL. But... Stolen from sx8.c */ - if ((q = sc->disk->queue) != NULL) - blk_cleanup_queue(q); + while (!list_empty(&sc->luns)) { + p = sc->luns.next; + lun = list_entry(p, struct ub_lun, link); + list_del(p); - /* - * If we zero disk->private_data BEFORE put_disk, we have to check - * for NULL all over the place in open, release, check_media and - * revalidate, because the block level semaphore is well inside the - * put_disk. But we cannot zero after the call, because *disk is gone. - * The sd.c is blatantly racy in this area. - */ - /* disk->private_data = NULL; */ - put_disk(sc->disk); - sc->disk = NULL; + /* I don't think queue can be NULL. But... Stolen from sx8.c */ + if ((q = lun->disk->queue) != NULL) + blk_cleanup_queue(q); + /* + * If we zero disk->private_data BEFORE put_disk, we have + * to check for NULL all over the place in open, release, + * check_media and revalidate, because the block level + * semaphore is well inside the put_disk. + * But we cannot zero after the call, because *disk is gone. + * The sd.c is blatantly racy in this area. + */ + /* disk->private_data = NULL; */ + put_disk(lun->disk); + lun->disk = NULL; + + ub_id_put(lun->id); + kfree(lun); + } - ub_id_put(sc->id); kfree(sc); } /* * The "command allocator". */ -static struct ub_scsi_cmd *ub_get_cmd(struct ub_dev *sc) +static struct ub_scsi_cmd *ub_get_cmd(struct ub_lun *lun) { struct ub_scsi_cmd *ret; - if (sc->cmda[0]) + if (lun->cmda[0]) return NULL; - ret = &sc->cmdv[0]; - sc->cmda[0] = 1; + ret = &lun->cmdv[0]; + lun->cmda[0] = 1; return ret; } -static void ub_put_cmd(struct ub_dev *sc, struct ub_scsi_cmd *cmd) +static void ub_put_cmd(struct ub_lun *lun, struct ub_scsi_cmd *cmd) { - if (cmd != &sc->cmdv[0]) { + if (cmd != &lun->cmdv[0]) { printk(KERN_WARNING "%s: releasing a foreign cmd %p\n", - sc->name, cmd); + lun->name, cmd); return; } - if (!sc->cmda[0]) { - printk(KERN_WARNING "%s: releasing a free cmd\n", sc->name); + if (!lun->cmda[0]) { + printk(KERN_WARNING "%s: releasing a free cmd\n", lun->name); return; } - sc->cmda[0] = 0; + lun->cmda[0] = 0; } /* @@ -630,29 +676,30 @@ static struct ub_scsi_cmd *ub_cmdq_pop(struct ub_dev *sc) static void ub_bd_rq_fn(request_queue_t *q) { - struct ub_dev *sc = q->queuedata; + struct ub_lun *lun = q->queuedata; struct request *rq; while ((rq = elv_next_request(q)) != NULL) { - if (ub_bd_rq_fn_1(sc, rq) != 0) { + if (ub_bd_rq_fn_1(lun, rq) != 0) { blk_stop_queue(q); break; } } } -static int ub_bd_rq_fn_1(struct ub_dev *sc, struct request *rq) +static int ub_bd_rq_fn_1(struct ub_lun *lun, struct request *rq) { + struct ub_dev *sc = lun->udev; struct ub_scsi_cmd *cmd; int rc; - if (atomic_read(&sc->poison) || sc->changed) { + if (atomic_read(&sc->poison) || lun->changed) { blkdev_dequeue_request(rq); ub_end_rq(rq, 0); return 0; } - if ((cmd = ub_get_cmd(sc)) == NULL) + if ((cmd = ub_get_cmd(lun)) == NULL) return -1; memset(cmd, 0, sizeof(struct ub_scsi_cmd)); @@ -661,32 +708,30 @@ static int ub_bd_rq_fn_1(struct ub_dev *sc, struct request *rq) if (blk_pc_request(rq)) { rc = ub_cmd_build_packet(sc, cmd, rq); } else { - rc = ub_cmd_build_block(sc, cmd, rq); + rc = ub_cmd_build_block(sc, lun, cmd, rq); } if (rc != 0) { - ub_put_cmd(sc, cmd); + ub_put_cmd(lun, cmd); ub_end_rq(rq, 0); - blk_start_queue(sc->disk->queue); return 0; } - cmd->state = UB_CMDST_INIT; + cmd->lun = lun; cmd->done = ub_rw_cmd_done; cmd->back = rq; cmd->tag = sc->tagcnt++; if ((rc = ub_submit_scsi(sc, cmd)) != 0) { - ub_put_cmd(sc, cmd); + ub_put_cmd(lun, cmd); ub_end_rq(rq, 0); - blk_start_queue(sc->disk->queue); return 0; } return 0; } -static int ub_cmd_build_block(struct ub_dev *sc, struct ub_scsi_cmd *cmd, - struct request *rq) +static int ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun, + struct ub_scsi_cmd *cmd, struct request *rq) { int ub_dir; #if 0 /* We use rq->buffer for now */ @@ -707,7 +752,7 @@ static int ub_cmd_build_block(struct ub_dev *sc, struct ub_scsi_cmd *cmd, sg = &cmd->sgv[0]; n_elem = blk_rq_map_sg(q, rq, sg); if (n_elem <= 0) { - ub_put_cmd(sc, cmd); + ub_put_cmd(lun, cmd); ub_end_rq(rq, 0); blk_start_queue(q); return 0; /* request with no s/g entries? */ @@ -716,7 +761,7 @@ static int ub_cmd_build_block(struct ub_dev *sc, struct ub_scsi_cmd *cmd, if (n_elem != 1) { /* Paranoia */ printk(KERN_WARNING "%s: request with %d segments\n", sc->name, n_elem); - ub_put_cmd(sc, cmd); + ub_put_cmd(lun, cmd); ub_end_rq(rq, 0); blk_start_queue(q); return 0; @@ -748,8 +793,8 @@ static int ub_cmd_build_block(struct ub_dev *sc, struct ub_scsi_cmd *cmd, * The call to blk_queue_hardsect_size() guarantees that request * is aligned, but it is given in terms of 512 byte units, always. */ - block = rq->sector >> sc->capacity.bshift; - nblks = rq->nr_sectors >> sc->capacity.bshift; + block = rq->sector >> lun->capacity.bshift; + nblks = rq->nr_sectors >> lun->capacity.bshift; cmd->cdb[0] = (ub_dir == UB_DIR_READ)? READ_10: WRITE_10; /* 10-byte uses 4 bytes of LBA: 2147483648KB, 2097152MB, 2048GB */ @@ -803,7 +848,8 @@ static int ub_cmd_build_packet(struct ub_dev *sc, struct ub_scsi_cmd *cmd, static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd) { struct request *rq = cmd->back; - struct gendisk *disk = sc->disk; + struct ub_lun *lun = cmd->lun; + struct gendisk *disk = lun->disk; request_queue_t *q = disk->queue; int uptodate; @@ -818,7 +864,7 @@ static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd) else uptodate = 0; - ub_put_cmd(sc, cmd); + ub_put_cmd(lun, cmd); ub_end_rq(rq, uptodate); blk_start_queue(q); } @@ -887,7 +933,7 @@ static int ub_scsi_cmd_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd) bcb->Tag = cmd->tag; /* Endianness is not important */ bcb->DataTransferLength = cpu_to_le32(cmd->len); bcb->Flags = (cmd->dir == UB_DIR_READ) ? 0x80 : 0; - bcb->Lun = 0; /* No multi-LUN yet */ + bcb->Lun = (cmd->lun != NULL) ? cmd->lun->num : 0; bcb->Length = cmd->cdb_len; /* copy the command payload */ @@ -1002,9 +1048,8 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd) * The control pipe clears itself - nothing to do. * XXX Might try to reset the device here and retry. */ - printk(KERN_NOTICE "%s: " - "stall on control pipe for device %u\n", - sc->name, sc->dev->devnum); + printk(KERN_NOTICE "%s: stall on control pipe\n", + sc->name); goto Bad_End; } @@ -1025,9 +1070,8 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd) * The control pipe clears itself - nothing to do. * XXX Might try to reset the device here and retry. */ - printk(KERN_NOTICE "%s: " - "stall on control pipe for device %u\n", - sc->name, sc->dev->devnum); + printk(KERN_NOTICE "%s: stall on control pipe\n", + sc->name); goto Bad_End; } @@ -1046,9 +1090,8 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd) rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); if (rc != 0) { printk(KERN_NOTICE "%s: " - "unable to submit clear for device %u" - " (code %d)\n", - sc->name, sc->dev->devnum, rc); + "unable to submit clear (%d)\n", + sc->name, rc); /* * This is typically ENOMEM or some other such shit. * Retrying is pointless. Just do Bad End on it... @@ -1107,9 +1150,8 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd) rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); if (rc != 0) { printk(KERN_NOTICE "%s: " - "unable to submit clear for device %u" - " (code %d)\n", - sc->name, sc->dev->devnum, rc); + "unable to submit clear (%d)\n", + sc->name, rc); /* * This is typically ENOMEM or some other such shit. * Retrying is pointless. Just do Bad End on it... @@ -1140,9 +1182,8 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd) rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); if (rc != 0) { printk(KERN_NOTICE "%s: " - "unable to submit clear for device %u" - " (code %d)\n", - sc->name, sc->dev->devnum, rc); + "unable to submit clear (%d)\n", + sc->name, rc); /* * This is typically ENOMEM or some other such shit. * Retrying is pointless. Just do Bad End on it... @@ -1164,9 +1205,8 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd) * encounter such a thing, try to read the CSW again. */ if (++cmd->stat_count >= 4) { - printk(KERN_NOTICE "%s: " - "unable to get CSW on device %u\n", - sc->name, sc->dev->devnum); + printk(KERN_NOTICE "%s: unable to get CSW\n", + sc->name); goto Bad_End; } __ub_state_stat(sc, cmd); @@ -1207,10 +1247,8 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd) */ if (++cmd->stat_count >= 4) { printk(KERN_NOTICE "%s: " - "tag mismatch orig 0x%x reply 0x%x " - "on device %u\n", - sc->name, cmd->tag, bcs->Tag, - sc->dev->devnum); + "tag mismatch orig 0x%x reply 0x%x\n", + sc->name, cmd->tag, bcs->Tag); goto Bad_End; } __ub_state_stat(sc, cmd); @@ -1244,8 +1282,8 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd) } else { printk(KERN_WARNING "%s: " - "wrong command state %d on device %u\n", - sc->name, cmd->state, sc->dev->devnum); + "wrong command state %d\n", + sc->name, cmd->state); goto Bad_End; } return; @@ -1288,7 +1326,6 @@ static void __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd) if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { /* XXX Clear stalls */ - printk("%s: CSW #%d submit failed (%d)\n", sc->name, cmd->tag, rc); /* P3 */ ub_complete(&sc->work_done); ub_state_done(sc, cmd, rc); return; @@ -1333,6 +1370,7 @@ static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd) scmd->state = UB_CMDST_INIT; scmd->data = sc->top_sense; scmd->len = UB_SENSE_SIZE; + scmd->lun = cmd->lun; scmd->done = ub_top_sense_done; scmd->back = cmd; @@ -1411,14 +1449,14 @@ static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd) } if (cmd != scmd->back) { printk(KERN_WARNING "%s: " - "sense done for wrong command 0x%x on device %u\n", - sc->name, cmd->tag, sc->dev->devnum); + "sense done for wrong command 0x%x\n", + sc->name, cmd->tag); return; } if (cmd->state != UB_CMDST_SENSE) { printk(KERN_WARNING "%s: " - "sense done with bad cmd state %d on device %u\n", - sc->name, cmd->state, sc->dev->devnum); + "sense done with bad cmd state %d\n", + sc->name, cmd->state); return; } @@ -1429,68 +1467,32 @@ static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd) ub_scsi_urb_compl(sc, cmd); } -#if 0 -/* Determine what the maximum LUN supported is */ -int usb_stor_Bulk_max_lun(struct us_data *us) -{ - int result; - - /* issue the command */ - result = usb_stor_control_msg(us, us->recv_ctrl_pipe, - US_BULK_GET_MAX_LUN, - USB_DIR_IN | USB_TYPE_CLASS | - USB_RECIP_INTERFACE, - 0, us->ifnum, us->iobuf, 1, HZ); - - /* - * Some devices (i.e. Iomega Zip100) need this -- apparently - * the bulk pipes get STALLed when the GetMaxLUN request is - * processed. This is, in theory, harmless to all other devices - * (regardless of if they stall or not). - */ - if (result < 0) { - usb_stor_clear_halt(us, us->recv_bulk_pipe); - usb_stor_clear_halt(us, us->send_bulk_pipe); - } - - US_DEBUGP("GetMaxLUN command result is %d, data is %d\n", - result, us->iobuf[0]); - - /* if we have a successful request, return the result */ - if (result == 1) - return us->iobuf[0]; - - /* return the default -- no LUNs */ - return 0; -} -#endif - /* * This is called from a process context. */ -static void ub_revalidate(struct ub_dev *sc) +static void ub_revalidate(struct ub_dev *sc, struct ub_lun *lun) { - sc->readonly = 0; /* XXX Query this from the device */ + lun->readonly = 0; /* XXX Query this from the device */ - sc->capacity.nsec = 0; - sc->capacity.bsize = 512; - sc->capacity.bshift = 0; + lun->capacity.nsec = 0; + lun->capacity.bsize = 512; + lun->capacity.bshift = 0; - if (ub_sync_tur(sc) != 0) + if (ub_sync_tur(sc, lun) != 0) return; /* Not ready */ - sc->changed = 0; + lun->changed = 0; - if (ub_sync_read_cap(sc, &sc->capacity) != 0) { + if (ub_sync_read_cap(sc, lun, &lun->capacity) != 0) { /* * The retry here means something is wrong, either with the * device, with the transport, or with our code. * We keep this because sd.c has retries for capacity. */ - if (ub_sync_read_cap(sc, &sc->capacity) != 0) { - sc->capacity.nsec = 0; - sc->capacity.bsize = 512; - sc->capacity.bshift = 0; + if (ub_sync_read_cap(sc, lun, &lun->capacity) != 0) { + lun->capacity.nsec = 0; + lun->capacity.bsize = 512; + lun->capacity.bshift = 0; } } } @@ -1503,12 +1505,15 @@ static void ub_revalidate(struct ub_dev *sc) static int ub_bd_open(struct inode *inode, struct file *filp) { struct gendisk *disk = inode->i_bdev->bd_disk; + struct ub_lun *lun; struct ub_dev *sc; unsigned long flags; int rc; - if ((sc = disk->private_data) == NULL) + if ((lun = disk->private_data) == NULL) return -ENXIO; + sc = lun->udev; + spin_lock_irqsave(&ub_lock, flags); if (atomic_read(&sc->poison)) { spin_unlock_irqrestore(&ub_lock, flags); @@ -1529,15 +1534,15 @@ static int ub_bd_open(struct inode *inode, struct file *filp) * The bottom line is, Al Viro says that we should not allow * bdev->bd_invalidated to be set when doing add_disk no matter what. */ - if (sc->first_open) { - if (sc->changed) { - sc->first_open = 0; + if (lun->first_open) { + lun->first_open = 0; + if (lun->changed) { rc = -ENOMEDIUM; goto err_open; } } - if (sc->removable || sc->readonly) + if (lun->removable || lun->readonly) check_disk_change(inode->i_bdev); /* @@ -1545,12 +1550,12 @@ static int ub_bd_open(struct inode *inode, struct file *filp) * under some pretty murky conditions (a failure of READ CAPACITY). * We may need it one day. */ - if (sc->removable && sc->changed && !(filp->f_flags & O_NDELAY)) { + if (lun->removable && lun->changed && !(filp->f_flags & O_NDELAY)) { rc = -ENOMEDIUM; goto err_open; } - if (sc->readonly && (filp->f_mode & FMODE_WRITE)) { + if (lun->readonly && (filp->f_mode & FMODE_WRITE)) { rc = -EROFS; goto err_open; } @@ -1567,7 +1572,8 @@ err_open: static int ub_bd_release(struct inode *inode, struct file *filp) { struct gendisk *disk = inode->i_bdev->bd_disk; - struct ub_dev *sc = disk->private_data; + struct ub_lun *lun = disk->private_data; + struct ub_dev *sc = lun->udev; ub_put(sc); return 0; @@ -1597,20 +1603,14 @@ static int ub_bd_ioctl(struct inode *inode, struct file *filp, */ static int ub_bd_revalidate(struct gendisk *disk) { - struct ub_dev *sc = disk->private_data; - - ub_revalidate(sc); - /* This is pretty much a long term P3 */ - if (!atomic_read(&sc->poison)) { /* Cover sc->dev */ - printk(KERN_INFO "%s: device %u capacity nsec %ld bsize %u\n", - sc->name, sc->dev->devnum, - sc->capacity.nsec, sc->capacity.bsize); - } + struct ub_lun *lun = disk->private_data; + + ub_revalidate(lun->udev, lun); /* XXX Support sector size switching like in sr.c */ - blk_queue_hardsect_size(disk->queue, sc->capacity.bsize); - set_capacity(disk, sc->capacity.nsec); - // set_disk_ro(sdkp->disk, sc->readonly); + blk_queue_hardsect_size(disk->queue, lun->capacity.bsize); + set_capacity(disk, lun->capacity.nsec); + // set_disk_ro(sdkp->disk, lun->readonly); return 0; } @@ -1626,9 +1626,9 @@ static int ub_bd_revalidate(struct gendisk *disk) */ static int ub_bd_media_changed(struct gendisk *disk) { - struct ub_dev *sc = disk->private_data; + struct ub_lun *lun = disk->private_data; - if (!sc->removable) + if (!lun->removable) return 0; /* @@ -1640,12 +1640,12 @@ static int ub_bd_media_changed(struct gendisk *disk) * will fail, then block layer discards the data. Since we never * spin drives up, such devices simply cannot be used with ub anyway. */ - if (ub_sync_tur(sc) != 0) { - sc->changed = 1; + if (ub_sync_tur(lun->udev, lun) != 0) { + lun->changed = 1; return 1; } - return sc->changed; + return lun->changed; } static struct block_device_operations ub_bd_fops = { @@ -1669,7 +1669,7 @@ static void ub_probe_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd) /* * Test if the device has a check condition on it, synchronously. */ -static int ub_sync_tur(struct ub_dev *sc) +static int ub_sync_tur(struct ub_dev *sc, struct ub_lun *lun) { struct ub_scsi_cmd *cmd; enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) }; @@ -1688,6 +1688,7 @@ static int ub_sync_tur(struct ub_dev *sc) cmd->cdb_len = 6; cmd->dir = UB_DIR_NONE; cmd->state = UB_CMDST_INIT; + cmd->lun = lun; /* This may be NULL, but that's ok */ cmd->done = ub_probe_done; cmd->back = &compl; @@ -1718,7 +1719,8 @@ err_alloc: /* * Read the SCSI capacity synchronously (for probing). */ -static int ub_sync_read_cap(struct ub_dev *sc, struct ub_capacity *ret) +static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun, + struct ub_capacity *ret) { struct ub_scsi_cmd *cmd; char *p; @@ -1743,6 +1745,7 @@ static int ub_sync_read_cap(struct ub_dev *sc, struct ub_capacity *ret) cmd->state = UB_CMDST_INIT; cmd->data = p; cmd->len = 8; + cmd->lun = lun; cmd->done = ub_probe_done; cmd->back = &compl; @@ -1812,6 +1815,90 @@ static void ub_probe_timeout(unsigned long arg) } /* + * Get number of LUNs by the way of Bulk GetMaxLUN command. + */ +static int ub_sync_getmaxlun(struct ub_dev *sc) +{ + int ifnum = sc->intf->cur_altsetting->desc.bInterfaceNumber; + unsigned char *p; + enum { ALLOC_SIZE = 1 }; + struct usb_ctrlrequest *cr; + struct completion compl; + struct timer_list timer; + int nluns; + int rc; + + init_completion(&compl); + + rc = -ENOMEM; + if ((p = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) + goto err_alloc; + *p = 55; + + cr = &sc->work_cr; + cr->bRequestType = USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE; + cr->bRequest = US_BULK_GET_MAX_LUN; + cr->wValue = cpu_to_le16(0); + cr->wIndex = cpu_to_le16(ifnum); + cr->wLength = cpu_to_le16(1); + + usb_fill_control_urb(&sc->work_urb, sc->dev, sc->recv_ctrl_pipe, + (unsigned char*) cr, p, 1, ub_probe_urb_complete, &compl); + sc->work_urb.transfer_flags = 0; + sc->work_urb.actual_length = 0; + sc->work_urb.error_count = 0; + sc->work_urb.status = 0; + + if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) { + if (rc == -EPIPE) { + printk("%s: Stall at GetMaxLUN, using 1 LUN\n", + sc->name); /* P3 */ + } else { + printk(KERN_WARNING + "%s: Unable to submit GetMaxLUN (%d)\n", + sc->name, rc); + } + goto err_submit; + } + + init_timer(&timer); + timer.function = ub_probe_timeout; + timer.data = (unsigned long) &compl; + timer.expires = jiffies + UB_CTRL_TIMEOUT; + add_timer(&timer); + + wait_for_completion(&compl); + + del_timer_sync(&timer); + usb_kill_urb(&sc->work_urb); + + if (sc->work_urb.actual_length != 1) { + printk("%s: GetMaxLUN returned %d bytes\n", sc->name, + sc->work_urb.actual_length); /* P3 */ + nluns = 0; + } else { + if ((nluns = *p) == 55) { + nluns = 0; + } else { + /* GetMaxLUN returns the maximum LUN number */ + nluns += 1; + if (nluns > UB_MAX_LUNS) + nluns = UB_MAX_LUNS; + } + printk("%s: GetMaxLUN returned %d, using %d LUNs\n", sc->name, + *p, nluns); /* P3 */ + } + + kfree(p); + return nluns; + +err_submit: + kfree(p); +err_alloc: + return rc; +} + +/* * Clear initial stalls. */ static int ub_probe_clear_stall(struct ub_dev *sc, int stalled_pipe) @@ -1897,8 +1984,8 @@ static int ub_get_pipes(struct ub_dev *sc, struct usb_device *dev, } if (ep_in == NULL || ep_out == NULL) { - printk(KERN_NOTICE "%s: device %u failed endpoint check\n", - sc->name, sc->dev->devnum); + printk(KERN_NOTICE "%s: failed endpoint check\n", + sc->name); return -EIO; } @@ -1921,8 +2008,7 @@ static int ub_probe(struct usb_interface *intf, const struct usb_device_id *dev_id) { struct ub_dev *sc; - request_queue_t *q; - struct gendisk *disk; + int nluns; int rc; int i; @@ -1931,6 +2017,7 @@ static int ub_probe(struct usb_interface *intf, goto err_core; memset(sc, 0, sizeof(struct ub_dev)); spin_lock_init(&sc->lock); + INIT_LIST_HEAD(&sc->luns); usb_init_urb(&sc->work_urb); tasklet_init(&sc->tasklet, ub_scsi_action, (unsigned long)sc); atomic_set(&sc->poison, 0); @@ -1942,19 +2029,16 @@ static int ub_probe(struct usb_interface *intf, ub_init_completion(&sc->work_done); sc->work_done.done = 1; /* A little yuk, but oh well... */ - rc = -ENOSR; - if ((sc->id = ub_id_get()) == -1) - goto err_id; - snprintf(sc->name, 8, DRV_NAME "%c", sc->id + 'a'); - sc->dev = interface_to_usbdev(intf); sc->intf = intf; // sc->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; - usb_set_intfdata(intf, sc); usb_get_dev(sc->dev); // usb_get_intf(sc->intf); /* Do we need this? */ + snprintf(sc->name, 12, DRV_NAME "(%d.%d)", + sc->dev->bus->busnum, sc->dev->devnum); + /* XXX Verify that we can handle the device (from descriptors) */ ub_get_pipes(sc, sc->dev, intf); @@ -1992,35 +2076,88 @@ static int ub_probe(struct usb_interface *intf, * In any case it's not our business how revaliadation is implemented. */ for (i = 0; i < 3; i++) { /* Retries for benh's key */ - if ((rc = ub_sync_tur(sc)) <= 0) break; + if ((rc = ub_sync_tur(sc, NULL)) <= 0) break; if (rc != 0x6) break; msleep(10); } - sc->removable = 1; /* XXX Query this from the device */ - sc->changed = 1; /* ub_revalidate clears only */ - sc->first_open = 1; + nluns = 1; + for (i = 0; i < 3; i++) { + if ((rc = ub_sync_getmaxlun(sc)) < 0) { + /* + * Some devices (i.e. Iomega Zip100) need this -- + * apparently the bulk pipes get STALLed when the + * GetMaxLUN request is processed. + * XXX I have a ZIP-100, verify it does this. + */ + if (rc == -EPIPE) { + ub_probe_clear_stall(sc, sc->recv_bulk_pipe); + ub_probe_clear_stall(sc, sc->send_bulk_pipe); + } + break; + } + if (rc != 0) { + nluns = rc; + break; + } + mdelay(100); + } - ub_revalidate(sc); - /* This is pretty much a long term P3 */ - printk(KERN_INFO "%s: device %u capacity nsec %ld bsize %u\n", - sc->name, sc->dev->devnum, sc->capacity.nsec, sc->capacity.bsize); + for (i = 0; i < nluns; i++) { + ub_probe_lun(sc, i); + } + return 0; + + /* device_remove_file(&sc->intf->dev, &dev_attr_diag); */ +err_diag: + usb_set_intfdata(intf, NULL); + // usb_put_intf(sc->intf); + usb_put_dev(sc->dev); + kfree(sc); +err_core: + return rc; +} + +static int ub_probe_lun(struct ub_dev *sc, int lnum) +{ + struct ub_lun *lun; + request_queue_t *q; + struct gendisk *disk; + int rc; + + rc = -ENOMEM; + if ((lun = kmalloc(sizeof(struct ub_lun), GFP_KERNEL)) == NULL) + goto err_alloc; + memset(lun, 0, sizeof(struct ub_lun)); + lun->num = lnum; + + rc = -ENOSR; + if ((lun->id = ub_id_get()) == -1) + goto err_id; + + lun->udev = sc; + list_add(&lun->link, &sc->luns); + + snprintf(lun->name, 16, DRV_NAME "%c(%d.%d.%d)", + lun->id + 'a', sc->dev->bus->busnum, sc->dev->devnum, lun->num); + + lun->removable = 1; /* XXX Query this from the device */ + lun->changed = 1; /* ub_revalidate clears only */ + lun->first_open = 1; + ub_revalidate(sc, lun); - /* - * Just one disk per sc currently, but maybe more. - */ rc = -ENOMEM; if ((disk = alloc_disk(UB_MINORS_PER_MAJOR)) == NULL) goto err_diskalloc; - sc->disk = disk; - sprintf(disk->disk_name, DRV_NAME "%c", sc->id + 'a'); - sprintf(disk->devfs_name, DEVFS_NAME "/%c", sc->id + 'a'); + lun->disk = disk; + sprintf(disk->disk_name, DRV_NAME "%c", lun->id + 'a'); + sprintf(disk->devfs_name, DEVFS_NAME "/%c", lun->id + 'a'); disk->major = UB_MAJOR; - disk->first_minor = sc->id * UB_MINORS_PER_MAJOR; + disk->first_minor = lun->id * UB_MINORS_PER_MAJOR; disk->fops = &ub_bd_fops; - disk->private_data = sc; - disk->driverfs_dev = &intf->dev; + disk->private_data = lun; + disk->driverfs_dev = &sc->intf->dev; /* XXX Many to one ok? */ rc = -ENOMEM; if ((q = blk_init_queue(ub_bd_rq_fn, &sc->lock)) == NULL) @@ -2028,28 +2165,17 @@ static int ub_probe(struct usb_interface *intf, disk->queue = q; - // blk_queue_bounce_limit(q, hba[i]->pdev->dma_mask); + blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH); blk_queue_max_hw_segments(q, UB_MAX_REQ_SG); blk_queue_max_phys_segments(q, UB_MAX_REQ_SG); - // blk_queue_segment_boundary(q, CARM_SG_BOUNDARY); + blk_queue_segment_boundary(q, 0xffffffff); /* Dubious. */ blk_queue_max_sectors(q, UB_MAX_SECTORS); - blk_queue_hardsect_size(q, sc->capacity.bsize); - - /* - * This is a serious infraction, caused by a deficiency in the - * USB sg interface (usb_sg_wait()). We plan to remove this once - * we get mileage on the driver and can justify a change to USB API. - * See blk_queue_bounce_limit() to understand this part. - * - * XXX And I still need to be aware of the DMA mask in the HC. - */ - q->bounce_pfn = blk_max_low_pfn; - q->bounce_gfp = GFP_NOIO; + blk_queue_hardsect_size(q, lun->capacity.bsize); - q->queuedata = sc; + q->queuedata = lun; - set_capacity(disk, sc->capacity.nsec); - if (sc->removable) + set_capacity(disk, lun->capacity.nsec); + if (lun->removable) disk->flags |= GENHD_FL_REMOVABLE; add_disk(disk); @@ -2059,22 +2185,20 @@ static int ub_probe(struct usb_interface *intf, err_blkqinit: put_disk(disk); err_diskalloc: - device_remove_file(&sc->intf->dev, &dev_attr_diag); -err_diag: - usb_set_intfdata(intf, NULL); - // usb_put_intf(sc->intf); - usb_put_dev(sc->dev); - ub_id_put(sc->id); + list_del(&lun->link); + ub_id_put(lun->id); err_id: - kfree(sc); -err_core: + kfree(lun); +err_alloc: return rc; } static void ub_disconnect(struct usb_interface *intf) { struct ub_dev *sc = usb_get_intfdata(intf); - struct gendisk *disk = sc->disk; + struct list_head *p; + struct ub_lun *lun; + struct gendisk *disk; unsigned long flags; /* @@ -2124,14 +2248,18 @@ static void ub_disconnect(struct usb_interface *intf) /* * Unregister the upper layer. */ - if (disk->flags & GENHD_FL_UP) - del_gendisk(disk); - /* - * I wish I could do: - * set_bit(QUEUE_FLAG_DEAD, &q->queue_flags); - * As it is, we rely on our internal poisoning and let - * the upper levels to spin furiously failing all the I/O. - */ + list_for_each (p, &sc->luns) { + lun = list_entry(p, struct ub_lun, link); + disk = lun->disk; + if (disk->flags & GENHD_FL_UP) + del_gendisk(disk); + /* + * I wish I could do: + * set_bit(QUEUE_FLAG_DEAD, &q->queue_flags); + * As it is, we rely on our internal poisoning and let + * the upper levels to spin furiously failing all the I/O. + */ + } /* * Taking a lock on a structure which is about to be freed @@ -2182,8 +2310,8 @@ static int __init ub_init(void) { int rc; - /* P3 */ printk("ub: sizeof ub_scsi_cmd %zu ub_dev %zu\n", - sizeof(struct ub_scsi_cmd), sizeof(struct ub_dev)); + /* P3 */ printk("ub: sizeof ub_scsi_cmd %zu ub_dev %zu ub_lun %zu\n", + sizeof(struct ub_scsi_cmd), sizeof(struct ub_dev), sizeof(struct ub_lun)); if ((rc = register_blkdev(UB_MAJOR, DRV_NAME)) != 0) goto err_regblkdev; |
