1 // SPDX-License-Identifier: GPL-2.0-or-later
8  * Copyright (C) 1999-2000 Grant Grundler
27 #define EIEM_MASK(irq)       (1UL<<(CPU_IRQ_MAX - irq))
36 ** between ->ack() and ->end() of the interrupt to prevent
37 ** re-interruption of a processing interrupt.
43 	unsigned long eirr_bit = EIEM_MASK(d->irq);  in cpu_mask_irq()
66 	__cpu_unmask_irq(d->irq);  in cpu_unmask_irq()
71 	unsigned long mask = EIEM_MASK(d->irq);  in cpu_ack_irq()
86 	unsigned long mask = EIEM_MASK(d->irq);  in cpu_eoi_irq()
89 	/* set it in the eiems---it's no longer in process */  in cpu_eoi_irq()
103 		return -EINVAL;  in cpu_check_affinity()
119 	/* XXX: Needs to be written.  We managed without it so far, but
138 		seq_printf(p, "%10u ", irq_stats(j)->kernel_stack_usage);  in arch_show_interrupts()
143 		seq_printf(p, "%10u ", irq_stats(j)->irq_stack_usage);  in arch_show_interrupts()
151 			seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);  in arch_show_interrupts()
155 			seq_printf(p, "%10u ", irq_stats(j)->irq_call_count);  in arch_show_interrupts()
161 		seq_printf(p, "%10u ", irq_stats(j)->irq_unaligned_count);  in arch_show_interrupts()
165 		seq_printf(p, "%10u ", irq_stats(j)->irq_fpassist_count);  in arch_show_interrupts()
169 		seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);  in arch_show_interrupts()
194 		raw_spin_lock_irqsave(&desc->lock, flags);  in show_interrupts()
195 		action = desc->action;  in show_interrupts()
203 		seq_printf(p, " %14s", irq_desc_get_chip(desc)->name);  in show_interrupts()
205 		seq_printf(p, "  %s", action->name);  in show_interrupts()
207 		while ((action = action->next))  in show_interrupts()
208 			seq_printf(p, ", %s", action->name);  in show_interrupts()
210 		for ( ;action; action = action->next) {  in show_interrupts()
213 			min = max = action->cr16_hist[0];  in show_interrupts()
216 				int hist = action->cr16_hist[k];  in show_interrupts()
228 			seq_printf(p, " %s[%d/%d/%d]", action->name,  in show_interrupts()
235 		raw_spin_unlock_irqrestore(&desc->lock, flags);  in show_interrupts()
257 		return -EBUSY;  in cpu_claim_irq()
259 		return -EBUSY;  in cpu_claim_irq()
272 	return cpu_claim_irq(irq, NULL, NULL) ? -1 : irq;  in txn_claim_irq()
276  * The bits_wide parameter accommodates the limitations of the HW/SW which
279  * V-class (EPIC):          6 bits
280  * N/L/A-class (iosapic):   8 bits
285  * o PA 1.1 (and PA2.0 narrow mode)     5-bits (width of EIR register)
286  * o PA 2.0 wide mode                   6-bits (per processor)
287  * o IA64                               8-bits (0-256 total)
290  * by the processor...and the N/L-class I/O subsystem supports more bits than
301 		if ((irq - CPU_IRQ_BASE) >= (1 << bits_wide))  in txn_alloc_irq()
307 	return -1;  in txn_alloc_irq()
324 	static int next_cpu = -1;  in txn_alloc_addr()
343 	return virt_irq - CPU_IRQ_BASE;  in txn_alloc_data()
349 	return (BITS_PER_LONG - bit) + TIMER_IRQ;  in eirr_to_irq()
354  * IRQ STACK - used for irq handler
382 	unsigned long sp = regs->gr[30];  in stack_overflow_check()
389 	if (regs->sr[7])  in stack_overflow_check()
397 	stack_usage = sp - stack_start;  in stack_overflow_check()
404 	stack_usage = sp - stack_start;  in stack_overflow_check()
410 	if (likely(stack_usage < (IRQ_STACK_SIZE - STACK_MARGIN)))  in stack_overflow_check()
414 		 "(sp:%lx, stk bottom-top:%lx-%lx)\n",  in stack_overflow_check()
415 		current->comm, sp, stack_start, stack_start + IRQ_STACK_SIZE);  in stack_overflow_check()
427 	if (likely(stack_usage < (THREAD_SIZE - STACK_MARGIN)))  in stack_overflow_check()
431 		 "(sp:%lx, stk bottom-top:%lx-%lx)\n",  in stack_overflow_check()
432 		current->comm, sp, stack_start, stack_start + THREAD_SIZE);  in stack_overflow_check()
438 		sysctl_panic_on_stackoverflow = -1; /* disable further checks */  in stack_overflow_check()
439 		panic("low stack detected by irq handler - check messages\n");  in stack_overflow_check()
455 	irq_stack = (unsigned long) &union_ptr->stack;  in execute_on_irq_stack()
567 	local_irq_disable();	/* PARANOID - should already be disabled */  in init_IRQ()