diff options
Diffstat (limited to 'drivers/s390/block/dasd.c')
| -rw-r--r-- | drivers/s390/block/dasd.c | 92 |
1 files changed, 91 insertions, 1 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index c78db05e75b1..8973d34ce5ba 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -75,6 +75,8 @@ static void dasd_block_timeout(unsigned long); static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *); static void dasd_profile_init(struct dasd_profile *, struct dentry *); static void dasd_profile_exit(struct dasd_profile *); +static void dasd_hosts_init(struct dentry *, struct dasd_device *); +static void dasd_hosts_exit(struct dasd_device *); /* * SECTION: Operations on the device structure. @@ -267,6 +269,7 @@ static int dasd_state_known_to_basic(struct dasd_device *device) dasd_debugfs_setup(dev_name(&device->cdev->dev), dasd_debugfs_root_entry); dasd_profile_init(&device->profile, device->debugfs_dentry); + dasd_hosts_init(device->debugfs_dentry, device); /* register 'device' debug area, used for all DBF_DEV_XXX calls */ device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1, @@ -304,6 +307,7 @@ static int dasd_state_basic_to_known(struct dasd_device *device) return rc; dasd_device_clear_timer(device); dasd_profile_exit(&device->profile); + dasd_hosts_exit(device); debugfs_remove(device->debugfs_dentry); DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); if (device->debug_area != NULL) { @@ -1150,6 +1154,58 @@ int dasd_profile_on(struct dasd_profile *profile) #endif /* CONFIG_DASD_PROFILE */ +static int dasd_hosts_show(struct seq_file *m, void *v) +{ + struct dasd_device *device; + int rc = -EOPNOTSUPP; + + device = m->private; + dasd_get_device(device); + + if (device->discipline->hosts_print) + rc = device->discipline->hosts_print(device, m); + + dasd_put_device(device); + return rc; +} + +static int dasd_hosts_open(struct inode *inode, struct file *file) +{ + struct dasd_device *device = inode->i_private; + + return single_open(file, dasd_hosts_show, device); +} + +static const struct file_operations dasd_hosts_fops = { + .owner = THIS_MODULE, + .open = dasd_hosts_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static void dasd_hosts_exit(struct dasd_device *device) +{ + debugfs_remove(device->hosts_dentry); + device->hosts_dentry = NULL; +} + +static void dasd_hosts_init(struct dentry *base_dentry, + struct dasd_device *device) +{ + struct dentry *pde; + umode_t mode; + + if (!base_dentry) + return; + + mode = S_IRUSR | S_IFREG; + pde = debugfs_create_file("host_access_list", mode, base_dentry, + device, &dasd_hosts_fops); + if (pde && !IS_ERR(pde)) + device->hosts_dentry = pde; +} + /* * Allocate memory for a channel program with 'cplength' channel * command words and 'datasize' additional space. There are two @@ -1582,6 +1638,9 @@ void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, struct dasd_ccw_req *cqr, *next; struct dasd_device *device; unsigned long long now; + int nrf_suppressed = 0; + int fp_suppressed = 0; + u8 *sense = NULL; int expires; if (IS_ERR(irb)) { @@ -1617,7 +1676,23 @@ void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, dasd_put_device(device); return; } - device->discipline->dump_sense_dbf(device, irb, "int"); + + /* + * In some cases 'File Protected' or 'No Record Found' errors + * might be expected and debug log messages for the + * corresponding interrupts shouldn't be written then. + * Check if either of the according suppress bits is set. + */ + sense = dasd_get_sense(irb); + if (sense) { + fp_suppressed = (sense[1] & SNS1_FILE_PROTECTED) && + test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags); + nrf_suppressed = (sense[1] & SNS1_NO_REC_FOUND) && + test_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags); + } + if (!(fp_suppressed || nrf_suppressed)) + device->discipline->dump_sense_dbf(device, irb, "int"); + if (device->features & DASD_FEATURE_ERPLOG) device->discipline->dump_sense(device, cqr, irb); device->discipline->check_for_device_change(device, cqr, irb); @@ -2256,6 +2331,7 @@ static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible) { struct dasd_device *device; struct dasd_ccw_req *cqr, *n; + u8 *sense = NULL; int rc; retry: @@ -2302,6 +2378,20 @@ retry: rc = 0; list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) { /* + * In some cases the 'File Protected' or 'Incorrect Length' + * error might be expected and error recovery would be + * unnecessary in these cases. Check if the according suppress + * bit is set. + */ + sense = dasd_get_sense(&cqr->irb); + if (sense && sense[1] & SNS1_FILE_PROTECTED && + test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags)) + continue; + if (scsw_cstat(&cqr->irb.scsw) == 0x40 && + test_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags)) + continue; + + /* * for alias devices simplify error recovery and * return to upper layer * do not skip ERP requests |