1 // SPDX-License-Identifier: GPL-2.0-or-later
8  * Copyright (C) 1999-2000 Grant Grundler
30 #define EIEM_MASK(irq)       (1UL<<(CPU_IRQ_MAX - irq))
39 ** between ->ack() and ->end() of the interrupt to prevent
40 ** re-interruption of a processing interrupt.
46 	unsigned long eirr_bit = EIEM_MASK(d->irq);  in cpu_mask_irq()
69 	__cpu_unmask_irq(d->irq);  in cpu_unmask_irq()
74 	unsigned long mask = EIEM_MASK(d->irq);  in cpu_ack_irq()
77 	/* Clear in EIEM so we can no longer process */  in cpu_ack_irq()
89 	unsigned long mask = EIEM_MASK(d->irq);  in cpu_eoi_irq()
92 	/* set it in the eiems---it's no longer in process */  in cpu_eoi_irq()
106 		return -EINVAL;  in cpu_check_affinity()
141 		seq_printf(p, "%10u ", irq_stats(j)->kernel_stack_usage);  in arch_show_interrupts()
146 		seq_printf(p, "%10u ", irq_stats(j)->irq_stack_usage);  in arch_show_interrupts()
154 			seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);  in arch_show_interrupts()
158 			seq_printf(p, "%10u ", irq_stats(j)->irq_call_count);  in arch_show_interrupts()
164 		seq_printf(p, "%10u ", irq_stats(j)->irq_unaligned_count);  in arch_show_interrupts()
165 	seq_puts(p, "  Unaligned access handler traps\n");  in arch_show_interrupts()
168 		seq_printf(p, "%10u ", irq_stats(j)->irq_fpassist_count);  in arch_show_interrupts()
172 		seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);  in arch_show_interrupts()
197 		raw_spin_lock_irqsave(&desc->lock, flags);  in show_interrupts()
198 		action = desc->action;  in show_interrupts()
206 		seq_printf(p, " %14s", irq_desc_get_chip(desc)->name);  in show_interrupts()
208 		seq_printf(p, "  %s", action->name);  in show_interrupts()
210 		while ((action = action->next))  in show_interrupts()
211 			seq_printf(p, ", %s", action->name);  in show_interrupts()
213 		for ( ;action; action = action->next) {  in show_interrupts()
216 			min = max = action->cr16_hist[0];  in show_interrupts()
219 				int hist = action->cr16_hist[k];  in show_interrupts()
231 			seq_printf(p, " %s[%d/%d/%d]", action->name,  in show_interrupts()
238 		raw_spin_unlock_irqrestore(&desc->lock, flags);  in show_interrupts()
260 		return -EBUSY;  in cpu_claim_irq()
262 		return -EBUSY;  in cpu_claim_irq()
275 	return cpu_claim_irq(irq, NULL, NULL) ? -1 : irq;  in txn_claim_irq()
282  * V-class (EPIC):          6 bits
283  * N/L/A-class (iosapic):   8 bits
288  * o PA 1.1 (and PA2.0 narrow mode)     5-bits (width of EIR register)
289  * o PA 2.0 wide mode                   6-bits (per processor)
290  * o IA64                               8-bits (0-256 total)
293  * by the processor...and the N/L-class I/O subsystem supports more bits than
304 		if ((irq - CPU_IRQ_BASE) >= (1 << bits_wide))  in txn_alloc_irq()
310 	return -1;  in txn_alloc_irq()
327 	static int next_cpu = -1;  in txn_alloc_addr()
346 	return virt_irq - CPU_IRQ_BASE;  in txn_alloc_data()
352 	return (BITS_PER_LONG - bit) + TIMER_IRQ;  in eirr_to_irq()
357  * IRQ STACK - used for irq handler
385 	unsigned long sp = regs->gr[30];  in stack_overflow_check()
392 	if (regs->sr[7])  in stack_overflow_check()
400 	stack_usage = sp - stack_start;  in stack_overflow_check()
407 	stack_usage = sp - stack_start;  in stack_overflow_check()
413 	if (likely(stack_usage < (IRQ_STACK_SIZE - STACK_MARGIN)))  in stack_overflow_check()
417 		 "(sp:%lx, stk bottom-top:%lx-%lx)\n",  in stack_overflow_check()
418 		current->comm, sp, stack_start, stack_start + IRQ_STACK_SIZE);  in stack_overflow_check()
430 	if (likely(stack_usage < (THREAD_SIZE - STACK_MARGIN)))  in stack_overflow_check()
434 		 "(sp:%lx, stk bottom-top:%lx-%lx)\n",  in stack_overflow_check()
435 		current->comm, sp, stack_start, stack_start + THREAD_SIZE);  in stack_overflow_check()
441 		sysctl_panic_on_stackoverflow = -1; /* disable further checks */  in stack_overflow_check()
442 		panic("low stack detected by irq handler - check messages\n");  in stack_overflow_check()
458 	irq_stack = (unsigned long) &union_ptr->stack;  in execute_on_irq_stack()
471 		 * Do direct call on current stack. */  in execute_on_irq_stack()
570 	local_irq_disable();	/* PARANOID - should already be disabled */  in init_IRQ()