diff options
Diffstat (limited to 'drivers/s390/block/dasd_eckd.c')
| -rw-r--r-- | drivers/s390/block/dasd_eckd.c | 333 |
1 files changed, 252 insertions, 81 deletions
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c index 6215f6455eb8..62a323539226 100644 --- a/drivers/s390/block/dasd_eckd.c +++ b/drivers/s390/block/dasd_eckd.c @@ -1036,7 +1036,7 @@ static int dasd_eckd_read_conf(struct dasd_device *device) { void *conf_data; int conf_len, conf_data_saved; - int rc, path_err; + int rc, path_err, pos; __u8 lpm, opm; struct dasd_eckd_private *private, path_private; struct dasd_path *path_data; @@ -1068,6 +1068,17 @@ static int dasd_eckd_read_conf(struct dasd_device *device) path_data->opm |= lpm; continue; /* no error */ } + /* translate path mask to position in mask */ + pos = 8 - ffs(lpm); + kfree(private->path_conf_data[pos]); + if ((__u8 *)private->path_conf_data[pos] == + private->conf_data) { + private->conf_data = NULL; + private->conf_len = 0; + conf_data_saved = 0; + } + private->path_conf_data[pos] = + (struct dasd_conf_data *) conf_data; /* save first valid configuration data */ if (!conf_data_saved) { kfree(private->conf_data); @@ -1095,7 +1106,6 @@ static int dasd_eckd_read_conf(struct dasd_device *device) kfree(conf_data); continue; } - if (dasd_eckd_compare_path_uid( device, &path_private)) { uid = &path_private.uid; @@ -1157,9 +1167,6 @@ static int dasd_eckd_read_conf(struct dasd_device *device) path_data->cablepm &= ~lpm; path_data->hpfpm &= ~lpm; path_data->cuirpm &= ~lpm; - - if (conf_data != private->conf_data) - kfree(conf_data); } return path_err; @@ -1259,7 +1266,11 @@ static void do_path_verification_work(struct work_struct *work) schedule_work(work); return; } - + /* check if path verification already running and delay if so */ + if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) { + schedule_work(work); + return; + } opm = 0; npm = 0; ppm = 0; @@ -1402,7 +1413,7 @@ static void do_path_verification_work(struct work_struct *work) device->path_data.hpfpm |= hpfpm; spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); } - + clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags); dasd_put_device(device); if (data->isglobal) mutex_unlock(&dasd_path_verification_mutex); @@ -1810,6 +1821,7 @@ out_err1: static void dasd_eckd_uncheck_device(struct dasd_device *device) { struct dasd_eckd_private *private; + int i; private = (struct dasd_eckd_private *) device->private; dasd_alias_disconnect_device_from_lcu(device); @@ -1818,6 +1830,15 @@ static void dasd_eckd_uncheck_device(struct dasd_device *device) private->vdsneq = NULL; private->gneq = NULL; private->conf_len = 0; + for (i = 0; i < 8; i++) { + kfree(private->path_conf_data[i]); + if ((__u8 *)private->path_conf_data[i] == + private->conf_data) { + private->conf_data = NULL; + private->conf_len = 0; + } + private->path_conf_data[i] = NULL; + } kfree(private->conf_data); private->conf_data = NULL; } @@ -3968,7 +3989,7 @@ static int dasd_symm_io(struct dasd_device *device, void __user *argp) rc = -EFAULT; if (copy_from_user(&usrparm, argp, sizeof(usrparm))) goto out; - if (is_compat_task() || sizeof(long) == 4) { + if (is_compat_task()) { /* Make sure pointers are sane even on 31 bit. */ rc = -EINVAL; if ((usrparm.psf_data >> 32) != 0) @@ -4525,12 +4546,13 @@ static int dasd_eckd_read_message_buffer(struct dasd_device *device, cqr->startdev = device; cqr->memdev = device; cqr->block = NULL; - cqr->retries = 256; cqr->expires = 10 * HZ; - - /* we need to check for messages on exactly this path */ set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags); - cqr->lpm = lpum; + /* dasd_sleep_on_immediatly does not do complex error + * recovery so clear erp flag and set retry counter to + * do basic erp */ + clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); + cqr->retries = 256; /* Prepare for Read Subsystem Data */ prssdp = (struct dasd_psf_prssd_data *) cqr->data; @@ -4605,10 +4627,10 @@ dasd_eckd_psf_cuir_response(struct dasd_device *device, int response, psf_cuir->message_id = message_id; psf_cuir->cssid = sch_id.cssid; psf_cuir->ssid = sch_id.ssid; - ccw = cqr->cpaddr; ccw->cmd_code = DASD_ECKD_CCW_PSF; ccw->cda = (__u32)(addr_t)psf_cuir; + ccw->flags = CCW_FLAG_SLI; ccw->count = sizeof(struct dasd_psf_cuir_response); cqr->startdev = device; @@ -4618,6 +4640,7 @@ dasd_eckd_psf_cuir_response(struct dasd_device *device, int response, cqr->expires = 10*HZ; cqr->buildclk = get_tod_clock(); cqr->status = DASD_CQR_FILLED; + set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags); rc = dasd_sleep_on(cqr); @@ -4625,118 +4648,252 @@ dasd_eckd_psf_cuir_response(struct dasd_device *device, int response, return rc; } -static int dasd_eckd_cuir_change_state(struct dasd_device *device, __u8 lpum) +/* + * return configuration data that is referenced by record selector + * if a record selector is specified or per default return the + * conf_data pointer for the path specified by lpum + */ +static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device, + __u8 lpum, + struct dasd_cuir_message *cuir) { - unsigned long flags; - __u8 tbcpm; + struct dasd_eckd_private *private; + struct dasd_conf_data *conf_data; + int path, pos; - spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); - tbcpm = device->path_data.opm & ~lpum; - if (tbcpm) { - device->path_data.opm = tbcpm; - device->path_data.cuirpm |= lpum; + private = (struct dasd_eckd_private *) device->private; + if (cuir->record_selector == 0) + goto out; + for (path = 0x80, pos = 0; path; path >>= 1, pos++) { + conf_data = private->path_conf_data[pos]; + if (conf_data->gneq.record_selector == + cuir->record_selector) + return conf_data; + } +out: + return private->path_conf_data[8 - ffs(lpum)]; +} + +/* + * This function determines the scope of a reconfiguration request by + * analysing the path and device selection data provided in the CUIR request. + * Returns a path mask containing CUIR affected paths for the give device. + * + * If the CUIR request does not contain the required information return the + * path mask of the path the attention message for the CUIR request was reveived + * on. + */ +static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum, + struct dasd_cuir_message *cuir) +{ + struct dasd_conf_data *ref_conf_data; + unsigned long bitmask = 0, mask = 0; + struct dasd_eckd_private *private; + struct dasd_conf_data *conf_data; + unsigned int pos, path; + char *ref_gneq, *gneq; + char *ref_ned, *ned; + int tbcpm = 0; + + /* if CUIR request does not specify the scope use the path + the attention message was presented on */ + if (!cuir->ned_map || + !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2])) + return lpum; + + private = (struct dasd_eckd_private *) device->private; + /* get reference conf data */ + ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir); + /* reference ned is determined by ned_map field */ + pos = 8 - ffs(cuir->ned_map); + ref_ned = (char *)&ref_conf_data->neds[pos]; + ref_gneq = (char *)&ref_conf_data->gneq; + /* transfer 24 bit neq_map to mask */ + mask = cuir->neq_map[2]; + mask |= cuir->neq_map[1] << 8; + mask |= cuir->neq_map[0] << 16; + + for (path = 0x80; path; path >>= 1) { + /* initialise data per path */ + bitmask = mask; + pos = 8 - ffs(path); + conf_data = private->path_conf_data[pos]; + pos = 8 - ffs(cuir->ned_map); + ned = (char *) &conf_data->neds[pos]; + /* compare reference ned and per path ned */ + if (memcmp(ref_ned, ned, sizeof(*ned)) != 0) + continue; + gneq = (char *)&conf_data->gneq; + /* compare reference gneq and per_path gneq under + 24 bit mask where mask bit 0 equals byte 7 of + the gneq and mask bit 24 equals byte 31 */ + while (bitmask) { + pos = ffs(bitmask) - 1; + if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1) + != 0) + break; + clear_bit(pos, &bitmask); + } + if (bitmask) + continue; + /* device and path match the reference values + add path to CUIR scope */ + tbcpm |= path; + } + return tbcpm; +} + +static void dasd_eckd_cuir_notify_user(struct dasd_device *device, + unsigned long paths, + struct subchannel_id sch_id, int action) +{ + struct channel_path_desc *desc; + int pos; + + while (paths) { + /* get position of bit in mask */ + pos = ffs(paths) - 1; + /* get channel path descriptor from this position */ + desc = ccw_device_get_chp_desc(device->cdev, 7 - pos); + if (action == CUIR_QUIESCE) + pr_warn("Service on the storage server caused path " + "%x.%02x to go offline", sch_id.cssid, + desc ? desc->chpid : 0); + else if (action == CUIR_RESUME) + pr_info("Path %x.%02x is back online after service " + "on the storage server", sch_id.cssid, + desc ? desc->chpid : 0); + kfree(desc); + clear_bit(pos, &paths); } - spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); - return tbcpm ? 0 : PSF_CUIR_LAST_PATH; +} + +static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum, + struct dasd_cuir_message *cuir) +{ + unsigned long tbcpm; + + tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir); + /* nothing to do if path is not in use */ + if (!(device->path_data.opm & tbcpm)) + return 0; + if (!(device->path_data.opm & ~tbcpm)) { + /* no path would be left if the CUIR action is taken + return error */ + return -EINVAL; + } + /* remove device from operational path mask */ + device->path_data.opm &= ~tbcpm; + device->path_data.cuirpm |= tbcpm; + return tbcpm; } /* - * walk through all devices and quiesce them - * if it is the last path return error + * walk through all devices and build a path mask to quiesce them + * return an error if the last path to a device would be removed * * if only part of the devices are quiesced and an error * occurs no onlining necessary, the storage server will * notify the already set offline devices again */ static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum, - struct channel_path_desc *desc, - struct subchannel_id sch_id) + struct subchannel_id sch_id, + struct dasd_cuir_message *cuir) { struct alias_pav_group *pavgroup, *tempgroup; struct dasd_eckd_private *private; struct dasd_device *dev, *n; - int rc; + unsigned long paths = 0; + unsigned long flags; + int tbcpm; private = (struct dasd_eckd_private *) device->private; - rc = 0; - /* active devices */ - list_for_each_entry_safe(dev, n, - &private->lcu->active_devices, + list_for_each_entry_safe(dev, n, &private->lcu->active_devices, alias_list) { - rc = dasd_eckd_cuir_change_state(dev, lpum); - if (rc) - goto out; + spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags); + tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir); + spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags); + if (tbcpm < 0) + goto out_err; + paths |= tbcpm; } - /* inactive devices */ - list_for_each_entry_safe(dev, n, - &private->lcu->inactive_devices, + list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices, alias_list) { - rc = dasd_eckd_cuir_change_state(dev, lpum); - if (rc) - goto out; + spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags); + tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir); + spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags); + if (tbcpm < 0) + goto out_err; + paths |= tbcpm; } - /* devices in PAV groups */ list_for_each_entry_safe(pavgroup, tempgroup, &private->lcu->grouplist, group) { list_for_each_entry_safe(dev, n, &pavgroup->baselist, alias_list) { - rc = dasd_eckd_cuir_change_state(dev, lpum); - if (rc) - goto out; + spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags); + tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir); + spin_unlock_irqrestore( + get_ccwdev_lock(dev->cdev), flags); + if (tbcpm < 0) + goto out_err; + paths |= tbcpm; } list_for_each_entry_safe(dev, n, &pavgroup->aliaslist, alias_list) { - rc = dasd_eckd_cuir_change_state(dev, lpum); - if (rc) - goto out; + spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags); + tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir); + spin_unlock_irqrestore( + get_ccwdev_lock(dev->cdev), flags); + if (tbcpm < 0) + goto out_err; + paths |= tbcpm; } } - - pr_warn("Service on the storage server caused path %x.%02x to go offline", - sch_id.cssid, desc ? desc->chpid : 0); - rc = PSF_CUIR_COMPLETED; -out: - return rc; + /* notify user about all paths affected by CUIR action */ + dasd_eckd_cuir_notify_user(device, paths, sch_id, CUIR_QUIESCE); + return 0; +out_err: + return tbcpm; } static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum, - struct channel_path_desc *desc, - struct subchannel_id sch_id) + struct subchannel_id sch_id, + struct dasd_cuir_message *cuir) { struct alias_pav_group *pavgroup, *tempgroup; struct dasd_eckd_private *private; struct dasd_device *dev, *n; + unsigned long paths = 0; + int tbcpm; - pr_info("Path %x.%02x is back online after service on the storage server", - sch_id.cssid, desc ? desc->chpid : 0); private = (struct dasd_eckd_private *) device->private; - /* * the path may have been added through a generic path event before * only trigger path verification if the path is not already in use */ - list_for_each_entry_safe(dev, n, &private->lcu->active_devices, alias_list) { - if (!(dev->path_data.opm & lpum)) { - dev->path_data.tbvpm |= lpum; + tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir); + paths |= tbcpm; + if (!(dev->path_data.opm & tbcpm)) { + dev->path_data.tbvpm |= tbcpm; dasd_schedule_device_bh(dev); } } - list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices, alias_list) { - if (!(dev->path_data.opm & lpum)) { - dev->path_data.tbvpm |= lpum; + tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir); + paths |= tbcpm; + if (!(dev->path_data.opm & tbcpm)) { + dev->path_data.tbvpm |= tbcpm; dasd_schedule_device_bh(dev); } } - /* devices in PAV groups */ list_for_each_entry_safe(pavgroup, tempgroup, &private->lcu->grouplist, @@ -4744,21 +4901,27 @@ static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum, list_for_each_entry_safe(dev, n, &pavgroup->baselist, alias_list) { - if (!(dev->path_data.opm & lpum)) { - dev->path_data.tbvpm |= lpum; + tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir); + paths |= tbcpm; + if (!(dev->path_data.opm & tbcpm)) { + dev->path_data.tbvpm |= tbcpm; dasd_schedule_device_bh(dev); } } list_for_each_entry_safe(dev, n, &pavgroup->aliaslist, alias_list) { - if (!(dev->path_data.opm & lpum)) { - dev->path_data.tbvpm |= lpum; + tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir); + paths |= tbcpm; + if (!(dev->path_data.opm & tbcpm)) { + dev->path_data.tbvpm |= tbcpm; dasd_schedule_device_bh(dev); } } } - return PSF_CUIR_COMPLETED; + /* notify user about all paths affected by CUIR action */ + dasd_eckd_cuir_notify_user(device, paths, sch_id, CUIR_RESUME); + return 0; } static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages, @@ -4768,8 +4931,12 @@ static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages, struct channel_path_desc *desc; struct subchannel_id sch_id; int pos, response; - ccw_device_get_schid(device->cdev, &sch_id); + DBF_DEV_EVENT(DBF_WARNING, device, + "CUIR request: %016llx %016llx %016llx %08x", + ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2], + ((u32 *)cuir)[3]); + ccw_device_get_schid(device->cdev, &sch_id); /* get position of path in mask */ pos = 8 - ffs(lpum); /* get channel path descriptor from this position */ @@ -4777,18 +4944,26 @@ static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages, if (cuir->code == CUIR_QUIESCE) { /* quiesce */ - response = dasd_eckd_cuir_quiesce(device, lpum, desc, sch_id); + if (dasd_eckd_cuir_quiesce(device, lpum, sch_id, cuir)) + response = PSF_CUIR_LAST_PATH; + else + response = PSF_CUIR_COMPLETED; } else if (cuir->code == CUIR_RESUME) { /* resume */ - response = dasd_eckd_cuir_resume(device, lpum, desc, sch_id); + dasd_eckd_cuir_resume(device, lpum, sch_id, cuir); + response = PSF_CUIR_COMPLETED; } else response = PSF_CUIR_NOT_SUPPORTED; - dasd_eckd_psf_cuir_response(device, response, cuir->message_id, - desc, sch_id); - + dasd_eckd_psf_cuir_response(device, response, + cuir->message_id, desc, sch_id); + DBF_DEV_EVENT(DBF_WARNING, device, + "CUIR response: %d on message ID %08x", response, + cuir->message_id); /* free descriptor copy */ kfree(desc); + /* to make sure there is no attention left schedule work again */ + device->discipline->check_attention(device, lpum); } static void dasd_eckd_check_attention_work(struct work_struct *work) @@ -4800,22 +4975,18 @@ static void dasd_eckd_check_attention_work(struct work_struct *work) data = container_of(work, struct check_attention_work_data, worker); device = data->device; - messages = kzalloc(sizeof(*messages), GFP_KERNEL); if (!messages) { DBF_DEV_EVENT(DBF_WARNING, device, "%s", "Could not allocate attention message buffer"); goto out; } - rc = dasd_eckd_read_message_buffer(device, messages, data->lpum); if (rc) goto out; - if (messages->length == ATTENTION_LENGTH_CUIR && messages->format == ATTENTION_FORMAT_CUIR) dasd_eckd_handle_cuir(device, messages, data->lpum); - out: dasd_put_device(device); kfree(messages); |