180  * gisa_set_iam - change the GISA interruption alert mask
185  * Change the IAM atomically with the next alert address and the IPM
186  * of the GISA if the GISA is not part of the GIB alert list. All three
190  *          -EBUSY in case the gisa is part of the alert list
211  * Clear the IPM atomically with the next alert address and the IAM
230  * Atomically restores the interruption alert mask if none of the
242 		alert_mask = READ_ONCE(gi->alert.mask);  in gisa_get_ipm_or_restore_iam()
3080 		 * If the NONE_GISA_ADDR is still stored in the alert list  in process_gib_alert_list()
3082 		 * been added to the alert list by millicode while processing  in process_gib_alert_list()
3083 		 * the current alert list.  in process_gib_alert_list()
3087 		 * Cut off the alert list and store the NONE_GISA_ADDR in the  in process_gib_alert_list()
3088 		 * alert list origin to avoid further GAL interruptions.  in process_gib_alert_list()
3089 		 * A new alert list can be build up by millicode in parallel  in process_gib_alert_list()
3090 		 * for guests not in the yet cut-off alert list. When in the  in process_gib_alert_list()
3097 		 * Loop through the just cut-off alert list and start the  in process_gib_alert_list()
3133 	gi->alert.mask = 0;  in kvm_s390_gisa_init()
3134 	spin_lock_init(&gi->alert.ref_lock);  in kvm_s390_gisa_init()
3172 	WARN(gi->alert.mask != 0x00,  in kvm_s390_gisa_destroy()
3173 	     "unexpected non zero alert.mask 0x%02x",  in kvm_s390_gisa_destroy()
3174 	     gi->alert.mask);  in kvm_s390_gisa_destroy()
3175 	gi->alert.mask = 0x00;  in kvm_s390_gisa_destroy()
3176 	if (gisa_set_iam(gi->origin, gi->alert.mask))  in kvm_s390_gisa_destroy()
3207  * The function extends the vm specific alert mask to use.
3209  * in case the GISA is not part of the GIB alert list.
3213  * Returns: the nonspecific ISC (NISC) the gib alert mechanism
3227 	spin_lock(&gi->alert.ref_lock);  in kvm_s390_gisc_register()
3228 	gi->alert.ref_count[gisc]++;  in kvm_s390_gisc_register()
3229 	if (gi->alert.ref_count[gisc] == 1) {  in kvm_s390_gisc_register()
3230 		gi->alert.mask |= 0x80 >> gisc;  in kvm_s390_gisc_register()
3231 		gisa_set_iam(gi->origin, gi->alert.mask);  in kvm_s390_gisc_register()
3233 	spin_unlock(&gi->alert.ref_lock);  in kvm_s390_gisc_register()
3245  * The function reduces the vm specific alert mask to use.
3247  * in case the GISA is not part of the GIB alert list.
3251  * Returns: the nonspecific ISC (NISC) the gib alert mechanism
3267 	spin_lock(&gi->alert.ref_lock);  in kvm_s390_gisc_unregister()
3268 	if (gi->alert.ref_count[gisc] == 0) {  in kvm_s390_gisc_unregister()
3272 	gi->alert.ref_count[gisc]--;  in kvm_s390_gisc_unregister()
3273 	if (gi->alert.ref_count[gisc] == 0) {  in kvm_s390_gisc_unregister()
3274 		gi->alert.mask &= ~(0x80 >> gisc);  in kvm_s390_gisc_unregister()
3275 		gisa_set_iam(gi->origin, gi->alert.mask);  in kvm_s390_gisc_unregister()
3278 	spin_unlock(&gi->alert.ref_lock);  in kvm_s390_gisc_unregister()
3404 		pr_err("Registering the GIB alert interruption handler failed\n");  in kvm_s390_gib_init()