1 // SPDX-License-Identifier: GPL-2.0
31 #define CHP_INFO_UPDATE_INTERVAL	1*HZ
43 /* Map for channel-path status. */
47 /* Time after which channel-path status may be outdated. */
58 	chpid_to_chp(chpid)->state = onoff;  in set_chp_logically_online()
61 /* On success return 0 if channel-path is varied offline, 1 if it is varied
62  * online. Return -ENODEV if channel-path is not registered. */
65 	return (chpid_to_chp(chpid) ? chpid_to_chp(chpid)->state : -ENODEV);  in chp_get_status()
69  * chp_get_sch_opm - return opm for subchannel
73  * used by the subchannel and the status of the associated channel-paths.
85 		chpid.id = sch->schib.pmcw.chpid[i];  in chp_get_sch_opm()
94  * chp_is_registered - check if a channel-path is registered
95  * @chpid: channel-path ID
97  * Return non-zero if a channel-path with the given chpid is registered,
139 	if (chp->cmg == -1)  in measurement_chars_read()
142 	return memory_read_from_buffer(buf, count, &off, &chp->cmg_chars,  in measurement_chars_read()
143 				       sizeof(chp->cmg_chars));  in measurement_chars_read()
159 	css = to_css(chp->dev.parent);  in chp_measurement_copy_block()
160 	id = chp->chpid.id;  in chp_measurement_copy_block()
164 		if (!chp->extended)  in chp_measurement_copy_block()
168 		area = css->ecub[id / CSS_ECUES_PER_PAGE];  in chp_measurement_copy_block()
172 		area = css->cub[id / CSS_CUES_PER_PAGE];  in chp_measurement_copy_block()
212 	device_remove_groups(&chp->dev, measurement_groups);  in chp_remove_cmg_attr()
217 	return device_add_groups(&chp->dev, measurement_groups);  in chp_add_cmg_attr()
229 	mutex_lock(&chp->lock);  in chp_status_show()
230 	status = chp->state;  in chp_status_show()
231 	mutex_unlock(&chp->lock);  in chp_status_show()
253 		mutex_lock(&cp->lock);  in chp_status_write()
254 		error = s390_vary_chpid(cp->chpid, 1);  in chp_status_write()
255 		mutex_unlock(&cp->lock);  in chp_status_write()
257 		mutex_lock(&cp->lock);  in chp_status_write()
258 		error = s390_vary_chpid(cp->chpid, 0);  in chp_status_write()
259 		mutex_unlock(&cp->lock);  in chp_status_write()
261 		error = -EINVAL;  in chp_status_write()
275 	status = chp_info_get_status(cp->chpid);  in chp_configure_show()
293 		return -EINVAL;  in chp_configure_write()
295 		return -EINVAL;  in chp_configure_write()
297 	chp_cfg_schedule(cp->chpid, val);  in chp_configure_write()
311 	mutex_lock(&chp->lock);  in chp_type_show()
312 	type = chp->desc.desc;  in chp_type_show()
313 	mutex_unlock(&chp->lock);  in chp_type_show()
326 	if (chp->cmg == -1) /* channel measurements not available */  in chp_cmg_show()
328 	return sprintf(buf, "%d\n", chp->cmg);  in chp_cmg_show()
340 	if (chp->shared == -1) /* channel measurements not available */  in chp_shared_show()
342 	return sprintf(buf, "%x\n", chp->shared);  in chp_shared_show()
353 	mutex_lock(&chp->lock);  in chp_chid_show()
354 	if (chp->desc_fmt1.flags & 0x10)  in chp_chid_show()
355 		rc = sprintf(buf, "%04x\n", chp->desc_fmt1.chid);  in chp_chid_show()
358 	mutex_unlock(&chp->lock);  in chp_chid_show()
370 	mutex_lock(&chp->lock);  in chp_chid_external_show()
371 	if (chp->desc_fmt1.flags & 0x10)  in chp_chid_external_show()
372 		rc = sprintf(buf, "%x\n", chp->desc_fmt1.flags & 0x8 ? 1 : 0);  in chp_chid_external_show()
375 	mutex_unlock(&chp->lock);  in chp_chid_external_show()
387 	mutex_lock(&chp->lock);  in chp_esc_show()
388 	rc = sprintf(buf, "%x\n", chp->desc_fmt1.esc);  in chp_esc_show()
389 	mutex_unlock(&chp->lock);  in chp_esc_show()
400 	for (i = 0; i < ARRAY_SIZE(suffixes) - 1; i++) {  in apply_max_suffix()
413 	unsigned long speed = chp->speed;  in speed_bps_show()  local
416 	suffix = apply_max_suffix(&speed, 1000);  in speed_bps_show()
418 	return suffix ? sysfs_emit(buf, "%lu%c\n", speed, suffix) :  in speed_bps_show()
419 			sysfs_emit(buf, "%lu\n", speed);  in speed_bps_show()
431 	mutex_lock(&chp->lock);  in util_string_read()
432 	rc = memory_read_from_buffer(buf, count, &off, chp->desc_fmt3.util_str,  in util_string_read()
433 				     sizeof(chp->desc_fmt3.util_str));  in util_string_read()
434 	mutex_unlock(&chp->lock);  in util_string_read()
439 		   sizeof(((struct channel_path_desc_fmt3 *)0)->util_str));
476  * chp_update_desc - update channel-path description
477  * @chp: channel-path
479  * Update the channel-path description of the specified channel-path
481  * Return zero on success, non-zero otherwise.
487 	rc = chsc_determine_fmt0_channel_path_desc(chp->chpid, &chp->desc);  in chp_update_desc()
495 	chsc_determine_fmt1_channel_path_desc(chp->chpid, &chp->desc_fmt1);  in chp_update_desc()
496 	chsc_determine_fmt3_channel_path_desc(chp->chpid, &chp->desc_fmt3);  in chp_update_desc()
503  * chp_new - register a new channel-path
504  * @chpid: channel-path ID
506  * Create and register data structure representing new channel-path. Return
507  * zero on success, non-zero otherwise.
515 	mutex_lock(&css->mutex);  in chp_new()
521 		ret = -ENOMEM;  in chp_new()
525 	chp->chpid = chpid;  in chp_new()
526 	chp->state = 1;  in chp_new()
527 	chp->dev.parent = &css->device;  in chp_new()
528 	chp->dev.groups = chp_attr_groups;  in chp_new()
529 	chp->dev.release = chp_release;  in chp_new()
530 	mutex_init(&chp->lock);  in chp_new()
536 	if ((chp->desc.flags & 0x80) == 0) {  in chp_new()
537 		ret = -ENODEV;  in chp_new()
540 	dev_set_name(&chp->dev, "chp%x.%02x", chpid.cssid, chpid.id);  in chp_new()
543 	ret = device_register(&chp->dev);  in chp_new()
547 		put_device(&chp->dev);  in chp_new()
551 	if (css->cm_enabled) {  in chp_new()
554 			device_unregister(&chp->dev);  in chp_new()
558 	css->chps[chpid.id] = chp;  in chp_new()
563 	mutex_unlock(&css->mutex);  in chp_new()
568  * chp_get_chp_desc - return newly allocated channel-path description
569  * @chpid: channel-path ID
571  * On success return a newly allocated copy of the channel-path description
572  * data associated with the given channel-path ID. Return %NULL on error.
586 	mutex_lock(&chp->lock);  in chp_get_chp_desc()
587 	memcpy(desc, &chp->desc, sizeof(*desc));  in chp_get_chp_desc()
588 	mutex_unlock(&chp->lock);  in chp_get_chp_desc()
593  * chp_process_crw - process channel-path status change
594  * @crw0: channel report-word to handler
595  * @crw1: second channel-report word (always NULL)
598  * Handle channel-report-words indicating that the status of a channel-path
612 		      crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,  in chp_process_crw()
613 		      crw0->erc, crw0->rsid);  in chp_process_crw()
619 	if (crw0->slct) {  in chp_process_crw()
621 			      "channel path %02X\n", crw0->rsid);  in chp_process_crw()
625 	chpid.id = crw0->rsid;  in chp_process_crw()
626 	switch (crw0->erc) {  in chp_process_crw()
638 			      crw0->erc);  in chp_process_crw()
649 		if (!(ssd->path_mask & mask))  in chp_ssd_get_mask()
651 		if (!chp_id_is_equal(&ssd->chpid[i], &link->chpid))  in chp_ssd_get_mask()
653 		if ((ssd->fla_valid_mask & mask) &&  in chp_ssd_get_mask()
654 		    ((ssd->fla[i] & link->fla_mask) != link->fla))  in chp_ssd_get_mask()
671 	chp_info_expires = jiffies - 1;  in info_expire()
675 /* Ensure that chp_info is up-to-date. */
693  * chp_info_get_status - retrieve configure status of a channel-path
694  * @chpid: channel-path ID
796  * chp_cfg_schedule - schedule chpid configuration request
797  * @chpid: channel-path ID
798  * @configure: Non-zero for configure, zero for deconfigure
800  * Schedule a channel-path configuration/deconfiguration request.
813  * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request
814  * @chpid: channel-path ID
816  * Cancel an active channel-path deconfiguration request if it has not yet
843 		return -ERESTARTSYS;  in cfg_wait_idle()
858 	/* Register available channel-paths. */  in chp_init()