f2c41828113050c19f0f09ce6d97beb733ebcd3e
2 * linux/arch/ia64/kernel/irq.c
4 * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
6 * This file contains the code used by various IRQ handling routines:
7 * asking for different IRQs should be done through these routines
8 * instead of just grabbing them. Thus setups with different IRQ numbers
9 * shouldn't result in any weird surprises, and installing new handlers
12 * Copyright (C) Ashok Raj<ashok.raj@intel.com>, Intel Corporation 2004
14 * 4/14/2004: Added code to handle cpu migration and do safe irq
15 * migration without losing interrupts for iosapic
19 #include <asm/delay.h>
20 #include <asm/uaccess.h>
21 #include <linux/module.h>
22 #include <linux/seq_file.h>
23 #include <linux/interrupt.h>
24 #include <linux/kernel_stat.h>
29 * 'what should we do if we get a hw irq event on an illegal vector'.
30 * each architecture has to answer this themselves.
32 void ack_bad_irq(unsigned int irq
)
34 printk(KERN_ERR
"Unexpected irq vector 0x%x on CPU %u!\n", irq
, smp_processor_id());
37 #ifdef CONFIG_IA64_GENERIC
38 ia64_vector
__ia64_irq_to_vector(int irq
)
40 return irq_cfg
[irq
].vector
;
43 unsigned int __ia64_local_vector_to_irq (ia64_vector vec
)
45 return __get_cpu_var(vector_irq
)[vec
];
50 * Interrupt statistics:
53 atomic_t irq_err_count
;
56 * /proc/interrupts printing:
58 int arch_show_interrupts(struct seq_file
*p
, int prec
)
60 seq_printf(p
, "ERR: %10u\n", atomic_read(&irq_err_count
));
65 static char irq_redir
[NR_IRQS
]; // = { [0 ... NR_IRQS-1] = 1 };
67 void set_irq_affinity_info (unsigned int irq
, int hwid
, int redir
)
70 cpumask_copy(irq_get_irq_data(irq
)->affinity
,
71 cpumask_of(cpu_logical_id(hwid
)));
72 irq_redir
[irq
] = (char) (redir
& 0xff);
76 bool is_affinity_mask_valid(const struct cpumask
*cpumask
)
78 if (ia64_platform_is("sn2")) {
79 /* Only allow one CPU to be specified in the smp_affinity mask */
80 if (cpumask_weight(cpumask
) != 1)
86 #endif /* CONFIG_SMP */
88 int __init
arch_early_irq_init(void)
94 #ifdef CONFIG_HOTPLUG_CPU
95 unsigned int vectors_in_migration
[NR_IRQS
];
98 * Since cpu_online_mask is already updated, we just need to check for
99 * affinity that has zeros
101 static void migrate_irqs(void)
105 for (irq
=0; irq
< NR_IRQS
; irq
++) {
106 struct irq_desc
*desc
= irq_to_desc(irq
);
107 struct irq_data
*data
= irq_desc_get_irq_data(desc
);
108 struct irq_chip
*chip
= irq_data_get_irq_chip(data
);
110 if (irqd_irq_disabled(data
))
114 * No handling for now.
115 * TBD: Implement a disable function so we can now
116 * tell CPU not to respond to these local intr sources.
117 * such as ITV,CPEI,MCA etc.
119 if (irqd_is_per_cpu(data
))
122 if (cpumask_any_and(data
->affinity
, cpu_online_mask
)
125 * Save it for phase 2 processing
127 vectors_in_migration
[irq
] = irq
;
129 new_cpu
= cpumask_any(cpu_online_mask
);
132 * Al three are essential, currently WARN_ON.. maybe panic?
134 if (chip
&& chip
->irq_disable
&&
135 chip
->irq_enable
&& chip
->irq_set_affinity
) {
136 chip
->irq_disable(data
);
137 chip
->irq_set_affinity(data
,
138 cpumask_of(new_cpu
), false);
139 chip
->irq_enable(data
);
141 WARN_ON((!chip
|| !chip
->irq_disable
||
143 !chip
->irq_set_affinity
));
149 void fixup_irqs(void)
152 extern void ia64_process_pending_intr(void);
153 extern volatile int time_keeper_id
;
155 /* Mask ITV to disable timer */
156 ia64_set_itv(1 << 16);
159 * Find a new timesync master
161 if (smp_processor_id() == time_keeper_id
) {
162 time_keeper_id
= cpumask_first(cpu_online_mask
);
163 printk ("CPU %d is now promoted to time-keeper master\n", time_keeper_id
);
167 * Phase 1: Locate IRQs bound to this cpu and
168 * relocate them for cpu removal.
173 * Phase 2: Perform interrupt processing for all entries reported in
176 ia64_process_pending_intr();
179 * Phase 3: Now handle any interrupts not captured in local APIC.
180 * This is to account for cases that device interrupted during the time the
181 * rte was being disabled and re-programmed.
183 for (irq
=0; irq
< NR_IRQS
; irq
++) {
184 if (vectors_in_migration
[irq
]) {
185 struct pt_regs
*old_regs
= set_irq_regs(NULL
);
187 vectors_in_migration
[irq
]=0;
188 generic_handle_irq(irq
);
189 set_irq_regs(old_regs
);
194 * Now let processor die. We do irq disable and max_xtp() to
195 * ensure there is no more interrupts routed to this processor.
196 * But the local timer interrupt can have 1 pending which we
197 * take care in timer_interrupt().