1 // SPDX-License-Identifier: GPL-2.0
24 #include <linux/entry-common.h>
54 	{.irq = EXT_INTERRUPT,	.name = "EXT"},
65 	{.irq = IRQEXT_CLK, .name = "CLK", .desc = "[EXT] Clock Comparator"},
66 	{.irq = IRQEXT_EXC, .name = "EXC", .desc = "[EXT] External Call"},
67 	{.irq = IRQEXT_EMS, .name = "EMS", .desc = "[EXT] Emergency Signal"},
68 	{.irq = IRQEXT_TMR, .name = "TMR", .desc = "[EXT] CPU Timer"},
69 	{.irq = IRQEXT_TLA, .name = "TAL", .desc = "[EXT] Timing Alert"},
70 	{.irq = IRQEXT_PFL, .name = "PFL", .desc = "[EXT] Pseudo Page Fault"},
71 	{.irq = IRQEXT_DSD, .name = "DSD", .desc = "[EXT] DASD Diag"},
72 	{.irq = IRQEXT_VRT, .name = "VRT", .desc = "[EXT] Virtio"},
73 	{.irq = IRQEXT_SCP, .name = "SCP", .desc = "[EXT] Service Call"},
74 	{.irq = IRQEXT_IUC, .name = "IUC", .desc = "[EXT] IUCV"},
75 	{.irq = IRQEXT_CMS, .name = "CMS", .desc = "[EXT] CPU-Measurement: Sampling"},
76 	{.irq = IRQEXT_CMC, .name = "CMC", .desc = "[EXT] CPU-Measurement: Counter"},
77 	{.irq = IRQEXT_FTP, .name = "FTP", .desc = "[EXT] HMC FTP Service"},
100 static void do_IRQ(struct pt_regs *regs, int irq)  in do_IRQ()  argument
113 	return ((S390_lowcore.async_stack ^ frame) & ~(THREAD_SIZE - 1)) == 0;  in on_async_stack()
116 static void do_irq_async(struct pt_regs *regs, int irq)  in do_irq_async()  argument
119 		do_IRQ(regs, irq);  in do_irq_async()
122 			      struct pt_regs *, regs, int, irq);  in do_irq_async()
126 static int irq_pending(struct pt_regs *regs)  in irq_pending()  argument
135 void noinstr do_io_irq(struct pt_regs *regs)  in do_io_irq()  argument
137 	irqentry_state_t state = irqentry_enter(regs);  in do_io_irq()
138 	struct pt_regs *old_regs = set_irq_regs(regs);  in do_io_irq()
143 	if (user_mode(regs)) {  in do_io_irq()
146 			current->thread.last_break = regs->last_break;  in do_io_irq()
154 		regs->tpi_info = S390_lowcore.tpi_info;  in do_io_irq()
156 			do_irq_async(regs, THIN_INTERRUPT);  in do_io_irq()
158 			do_irq_async(regs, IO_INTERRUPT);  in do_io_irq()
159 	} while (MACHINE_IS_LPAR && irq_pending(regs));  in do_io_irq()
164 	irqentry_exit(regs, state);  in do_io_irq()
167 		regs->psw.mask &= ~(PSW_MASK_EXT | PSW_MASK_IO | PSW_MASK_WAIT);  in do_io_irq()
170 void noinstr do_ext_irq(struct pt_regs *regs)  in do_ext_irq()  argument
172 	irqentry_state_t state = irqentry_enter(regs);  in do_ext_irq()
173 	struct pt_regs *old_regs = set_irq_regs(regs);  in do_ext_irq()
178 	if (user_mode(regs)) {  in do_ext_irq()
181 			current->thread.last_break = regs->last_break;  in do_ext_irq()
184 	regs->int_code = S390_lowcore.ext_int_code_addr;  in do_ext_irq()
185 	regs->int_parm = S390_lowcore.ext_params;  in do_ext_irq()
186 	regs->int_parm_long = S390_lowcore.ext_params2;  in do_ext_irq()
192 	do_irq_async(regs, EXT_INTERRUPT);  in do_ext_irq()
196 	irqentry_exit(regs, state);  in do_ext_irq()
199 		regs->psw.mask &= ~(PSW_MASK_EXT | PSW_MASK_IO | PSW_MASK_WAIT);  in do_ext_irq()
213 	raw_spin_lock_irqsave(&desc->lock, flags);  in show_msi_interrupt()
218 	if (desc->irq_data.chip)  in show_msi_interrupt()
219 		seq_printf(p, " %8s", desc->irq_data.chip->name);  in show_msi_interrupt()
221 	if (desc->action)  in show_msi_interrupt()
222 		seq_printf(p, "  %s", desc->action->name);  in show_msi_interrupt()
225 	raw_spin_unlock_irqrestore(&desc->lock, flags);  in show_msi_interrupt()
242 			seq_printf(p, "CPU%-8d", cpu);  in show_interrupts()
297 	return (code + (code >> 9)) & (ARRAY_SIZE(ext_int_hash) - 1);  in ext_hash()
308 		return -ENOMEM;  in register_external_irq()
309 	p->code = code;  in register_external_irq()
310 	p->handler = handler;  in register_external_irq()
314 	hlist_add_head_rcu(&p->entry, &ext_int_hash[index]);  in register_external_irq()
328 		if (p->code == code && p->handler == handler) {  in unregister_external_irq()
329 			hlist_del_rcu(&p->entry);  in unregister_external_irq()
340 	struct pt_regs *regs = get_irq_regs();  in do_ext_interrupt()  local
345 	ext_code.int_code = regs->int_code;  in do_ext_interrupt()
352 		if (unlikely(p->code != ext_code.code))  in do_ext_interrupt()
354 		p->handler(ext_code, regs->int_parm, regs->int_parm_long);  in do_ext_interrupt()
369 	if (request_irq(EXT_INTERRUPT, do_ext_interrupt, 0, "EXT", NULL))  in init_ext_interrupts()
370 		panic("Failed to register EXT interrupt\n");  in init_ext_interrupts()
397 	irq_subclass_refcount[subclass]--;  in irq_subclass_unregister()