2 * Copyright IBM Corp. 2004,2010
3 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
4 * Thomas Spatzier (tspat@de.ibm.com)
6 * This file contains interrupt related functions.
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/kernel_stat.h>
12 #include <linux/interrupt.h>
13 #include <linux/seq_file.h>
14 #include <linux/cpu.h>
15 #include <linux/proc_fs.h>
16 #include <linux/profile.h>
23 static const struct irq_class intrclass_names
[] = {
26 {.name
= "CLK", .desc
= "[EXT] Clock Comparator" },
27 {.name
= "IPI", .desc
= "[EXT] Signal Processor" },
28 {.name
= "TMR", .desc
= "[EXT] CPU Timer" },
29 {.name
= "TAL", .desc
= "[EXT] Timing Alert" },
30 {.name
= "PFL", .desc
= "[EXT] Pseudo Page Fault" },
31 {.name
= "DSD", .desc
= "[EXT] DASD Diag" },
32 {.name
= "VRT", .desc
= "[EXT] Virtio" },
33 {.name
= "SCP", .desc
= "[EXT] Service Call" },
34 {.name
= "IUC", .desc
= "[EXT] IUCV" },
35 {.name
= "CPM", .desc
= "[EXT] CPU Measurement" },
36 {.name
= "QAI", .desc
= "[I/O] QDIO Adapter Interrupt" },
37 {.name
= "QDI", .desc
= "[I/O] QDIO Interrupt" },
38 {.name
= "DAS", .desc
= "[I/O] DASD" },
39 {.name
= "C15", .desc
= "[I/O] 3215" },
40 {.name
= "C70", .desc
= "[I/O] 3270" },
41 {.name
= "TAP", .desc
= "[I/O] Tape" },
42 {.name
= "VMR", .desc
= "[I/O] Unit Record Devices" },
43 {.name
= "LCS", .desc
= "[I/O] LCS" },
44 {.name
= "CLW", .desc
= "[I/O] CLAW" },
45 {.name
= "CTC", .desc
= "[I/O] CTC" },
46 {.name
= "APB", .desc
= "[I/O] AP Bus" },
47 {.name
= "NMI", .desc
= "[NMI] Machine Check" },
51 * show_interrupts is needed by /proc/interrupts.
53 int show_interrupts(struct seq_file
*p
, void *v
)
55 int i
= *(loff_t
*) v
, j
;
60 for_each_online_cpu(j
)
61 seq_printf(p
, "CPU%d ",j
);
66 seq_printf(p
, "%s: ", intrclass_names
[i
].name
);
68 seq_printf(p
, "%10u ", kstat_irqs(i
));
70 for_each_online_cpu(j
)
71 seq_printf(p
, "%10u ", kstat_cpu(j
).irqs
[i
]);
73 if (intrclass_names
[i
].desc
)
74 seq_printf(p
, " %s", intrclass_names
[i
].desc
);
82 * For compatibilty only. S/390 specific setup of interrupts et al. is done
83 * much later in init_channel_subsystem().
92 * Switch to the asynchronous interrupt stack for softirq execution.
94 asmlinkage
void do_softirq(void)
96 unsigned long flags
, old
, new;
101 local_irq_save(flags
);
103 if (local_softirq_pending()) {
104 /* Get current stack pointer. */
105 asm volatile("la %0,0(15)" : "=a" (old
));
106 /* Check against async. stack address range. */
107 new = S390_lowcore
.async_stack
;
108 if (((new - old
) >> (PAGE_SHIFT
+ THREAD_ORDER
)) != 0) {
109 /* Need to switch to the async. stack. */
110 new -= STACK_FRAME_OVERHEAD
;
111 ((struct stack_frame
*) new)->back_chain
= old
;
113 asm volatile(" la 15,0(%0)\n"
116 : : "a" (new), "a" (old
),
118 : "0", "1", "2", "3", "4", "5", "14",
121 /* We are already on the async stack. */
125 local_irq_restore(flags
);
128 #ifdef CONFIG_PROC_FS
129 void init_irq_proc(void)
131 struct proc_dir_entry
*root_irq_dir
;
133 root_irq_dir
= proc_mkdir("irq", NULL
);
134 create_prof_cpu_mask(root_irq_dir
);