1 // SPDX-License-Identifier: GPL-2.0
7  * Copyright (C) 2000-2002 J.I. Lee <jung-ik.lee@intel.com>
8  * Copyright (C) 1999-2000, 2002-2003 Hewlett-Packard Co.
9  *	David Mosberger-Tang <davidm@hpl.hp.com>
38  * 03/02/19	B. Helgaas	Make pcat_compat system-wide, not per-IOSAPIC.
50  * (1) A PCI device raises one of the four interrupt pins (INTA, INTB, INTC,
51  *     INTD).  The device is uniquely identified by its bus-, and slot-number
63  * IOSAPIC pin into the IA-64 interrupt vector.  This interrupt vector is then
67  *     used as architecture-independent interrupt handling mechanism in Linux.
69  *     IA-64 interrupt vector number <-> IRQ number mapping.  On smaller
70  *     systems, we use one-to-one mapping between IA-64 vector and IRQ.
74  *	PCI pin -> global system interrupt (GSI) -> IA-64 vector <-> IRQ
111  * These tables map IA-64 vectors to the IOSAPIC pin that generates this
155 	spin_lock_irqsave(&iosapic->lock, flags);  in iosapic_write()
156 	__iosapic_write(iosapic->addr, reg, val);  in iosapic_write()
157 	spin_unlock_irqrestore(&iosapic->lock, flags);  in iosapic_write()
169 		if ((unsigned) (gsi - iosapic_lists[i].gsi_base) <  in find_iosapic()
174 	return -1;  in find_iosapic()
185 		list_for_each_entry(rte, &info->rtes, rte_list)  in __gsi_to_irq()
186 			if (rte->iosapic->gsi_base + rte->rte_index == gsi)  in __gsi_to_irq()
189 	return -1;  in __gsi_to_irq()
209 		if (rte->iosapic->gsi_base + rte->rte_index == gsi)  in find_rte()
230 	rte_index = rte->rte_index;  in set_rte()
250 	iosapic_write(rte->iosapic, IOSAPIC_RTE_HIGH(rte_index), high32);  in set_rte()
251 	iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte_index), low32);  in set_rte()
275 		list_for_each_entry(rte, &info->rtes,  in kexec_disable_iosapic()
277 			iosapic_write(rte->iosapic,  in kexec_disable_iosapic()
278 					IOSAPIC_RTE_LOW(rte->rte_index),  in kexec_disable_iosapic()
280 			iosapic_eoi(rte->iosapic->addr, vec);  in kexec_disable_iosapic()
289 	unsigned int irq = data->irq;  in mask_irq()
300 		rte_index = rte->rte_index;  in mask_irq()
301 		iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte_index), low32);  in mask_irq()
308 	unsigned int irq = data->irq;  in unmask_irq()
318 		rte_index = rte->rte_index;  in unmask_irq()
319 		iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte_index), low32);  in unmask_irq()
329 	unsigned int irq = data->irq;  in iosapic_set_affinity()
340 		return -1;  in iosapic_set_affinity()
343 		return -1;  in iosapic_set_affinity()
348 		return -1;			/* not an IOSAPIC interrupt */  in iosapic_set_affinity()
368 		iosapic = rte->iosapic;  in iosapic_set_affinity()
369 		rte_index = rte->rte_index;  in iosapic_set_affinity()
379  * Handlers for level-triggered interrupts.
392 	unsigned int irq = data->irq;  in iosapic_unmask_level_irq()
405 		iosapic_eoi(rte->iosapic->addr, vec);  in iosapic_unmask_level_irq()
419 	.name =			"IO-SAPIC-level",
431  * Handlers for edge-triggered interrupts.
449 	irq_complete_move(data->irq);  in iosapic_ack_edge_irq()
457 	.name =			"IO-SAPIC-edge",
485 	int i, irq = -ENOSPC, min_count = -1;  in iosapic_find_sharable_irq()
489 	 * shared vectors for edge-triggered interrupts are not  in iosapic_find_sharable_irq()
493 		return -EINVAL;  in iosapic_find_sharable_irq()
497 		if (info->trigger == trigger && info->polarity == pol &&  in iosapic_find_sharable_irq()
498 		    (info->dmode == IOSAPIC_FIXED ||  in iosapic_find_sharable_irq()
499 		     info->dmode == IOSAPIC_LOWEST_PRIORITY) &&  in iosapic_find_sharable_irq()
501 			if (min_count == -1 || info->count < min_count) {  in iosapic_find_sharable_irq()
503 				min_count = info->count;  in iosapic_find_sharable_irq()
563 		return -ENODEV;  in register_intr()
572 			return -ENOMEM;  in register_intr()
575 		rte->iosapic	= &iosapic_lists[index];  in register_intr()
576 		rte->rte_index	= gsi - rte->iosapic->gsi_base;  in register_intr()
577 		rte->refcnt++;  in register_intr()
578 		list_add_tail(&rte->rte_list, &iosapic_intr_info[irq].rtes);  in register_intr()
582 	else if (rte->refcnt == NO_REF_RTE) {  in register_intr()
584 		if (info->count > 0 &&  in register_intr()
585 		    (info->trigger != trigger || info->polarity != polarity)){  in register_intr()
589 			return -EINVAL;  in register_intr()
591 		rte->refcnt++;  in register_intr()
608 			       chip->name, irq_type->name);  in register_intr()
621 	static int cpu = -1;  in get_target_cpu()
640 	 * Some interrupts (ACPI SCI, for instance) are registered  in get_target_cpu()
682 	 * Otherwise, round-robin interrupt vectors across all the  in get_target_cpu()
735 		} else if (rte->refcnt != NO_REF_RTE) {  in iosapic_register_intr()
736 			rte->refcnt++;  in iosapic_register_intr()
750 	raw_spin_lock(&desc->lock);  in iosapic_register_intr()
755 		raw_spin_unlock(&desc->lock);  in iosapic_register_intr()
769 	printk(KERN_INFO "GSI %u (%s, %s) -> CPU %d (0x%04x) vector %d\n",  in iosapic_register_intr()
774 	raw_spin_unlock(&desc->lock);  in iosapic_register_intr()
811 	if (--rte->refcnt > 0)  in iosapic_unregister_intr()
814 	rte->refcnt = NO_REF_RTE;  in iosapic_unregister_intr()
818 	iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte->rte_index), low32);  in iosapic_unregister_intr()
820 	iosapic_intr_info[irq].count--;  in iosapic_unregister_intr()
822 	iosapic_lists[index].rtes_inuse--;  in iosapic_unregister_intr()
829 	       "GSI %u (%s, %s) -> CPU %d (0x%04x) vector %d unregistered\n",  in iosapic_unregister_intr()
893 		return -1;  in iosapic_register_platform_intr()
899 	       "PLATFORM int %s (0x%x): GSI %u (%s, %s) -> CPU %d (0x%04x)"  in iosapic_register_platform_intr()
925 	DBG("ISA: IRQ %u -> GSI %u (%s,%s) -> CPU %d (0x%04x) vector %d\n",  in iosapic_override_isa_irq()
942 		       "%s: Disabling PC-AT compatible 8259 interrupts\n",  in ia64_native_iosapic_pcat_compat_init()
977 	return -1;  in iosapic_alloc()
999 		end  = base + iosapic_lists[index].num_rte - 1;  in iosapic_check_gsi_range()
1004 		return -EBUSY;  in iosapic_check_gsi_range()
1016 		if (rte->iosapic->gsi_base + rte->rte_index == gsi) {  in iosapic_delete_rte()
1017 			if (rte->refcnt)  in iosapic_delete_rte()
1018 				return -EBUSY;  in iosapic_delete_rte()
1020 			list_del(&rte->rte_list);  in iosapic_delete_rte()
1026 	return -EINVAL;  in iosapic_delete_rte()
1040 		return -EBUSY;  in iosapic_init()
1046 		return -ENOMEM;  in iosapic_init()
1100 		err = -EBUSY;  in iosapic_remove()