1 /* 2 * Copyright IBM Corp. 2004,2010 3 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), 4 * Thomas Spatzier (tspat@de.ibm.com) 5 * 6 * This file contains interrupt related functions. 7 */ 8 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> 17 18 struct irq_class { 19 char *name; 20 char *desc; 21 }; 22 23 static const struct irq_class intrclass_names[] = { 24 {.name = "EXT" }, 25 {.name = "I/O" }, 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 = "QAI", .desc = "[I/O] QDIO Adapter Interrupt" }, 36 {.name = "QDI", .desc = "[I/O] QDIO Interrupt" }, 37 {.name = "DAS", .desc = "[I/O] DASD" }, 38 {.name = "C15", .desc = "[I/O] 3215" }, 39 {.name = "C70", .desc = "[I/O] 3270" }, 40 {.name = "TAP", .desc = "[I/O] Tape" }, 41 {.name = "VMR", .desc = "[I/O] Unit Record Devices" }, 42 {.name = "LCS", .desc = "[I/O] LCS" }, 43 {.name = "CLW", .desc = "[I/O] CLAW" }, 44 {.name = "CTC", .desc = "[I/O] CTC" }, 45 {.name = "APB", .desc = "[I/O] AP Bus" }, 46 {.name = "NMI", .desc = "[NMI] Machine Check" }, 47 }; 48 49 /* 50 * show_interrupts is needed by /proc/interrupts. 51 */ 52 int show_interrupts(struct seq_file *p, void *v) 53 { 54 int i = *(loff_t *) v, j; 55 56 get_online_cpus(); 57 if (i == 0) { 58 seq_puts(p, " "); 59 for_each_online_cpu(j) 60 seq_printf(p, "CPU%d ",j); 61 seq_putc(p, '\n'); 62 } 63 64 if (i < NR_IRQS) { 65 seq_printf(p, "%s: ", intrclass_names[i].name); 66 #ifndef CONFIG_SMP 67 seq_printf(p, "%10u ", kstat_irqs(i)); 68 #else 69 for_each_online_cpu(j) 70 seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); 71 #endif 72 if (intrclass_names[i].desc) 73 seq_printf(p, " %s", intrclass_names[i].desc); 74 seq_putc(p, '\n'); 75 } 76 put_online_cpus(); 77 return 0; 78 } 79 80 /* 81 * For compatibilty only. S/390 specific setup of interrupts et al. is done 82 * much later in init_channel_subsystem(). 83 */ 84 void __init 85 init_IRQ(void) 86 { 87 /* nothing... */ 88 } 89 90 /* 91 * Switch to the asynchronous interrupt stack for softirq execution. 92 */ 93 asmlinkage void do_softirq(void) 94 { 95 unsigned long flags, old, new; 96 97 if (in_interrupt()) 98 return; 99 100 local_irq_save(flags); 101 102 if (local_softirq_pending()) { 103 /* Get current stack pointer. */ 104 asm volatile("la %0,0(15)" : "=a" (old)); 105 /* Check against async. stack address range. */ 106 new = S390_lowcore.async_stack; 107 if (((new - old) >> (PAGE_SHIFT + THREAD_ORDER)) != 0) { 108 /* Need to switch to the async. stack. */ 109 new -= STACK_FRAME_OVERHEAD; 110 ((struct stack_frame *) new)->back_chain = old; 111 112 asm volatile(" la 15,0(%0)\n" 113 " basr 14,%2\n" 114 " la 15,0(%1)\n" 115 : : "a" (new), "a" (old), 116 "a" (__do_softirq) 117 : "0", "1", "2", "3", "4", "5", "14", 118 "cc", "memory" ); 119 } else 120 /* We are already on the async stack. */ 121 __do_softirq(); 122 } 123 124 local_irq_restore(flags); 125 } 126 127 #ifdef CONFIG_PROC_FS 128 void init_irq_proc(void) 129 { 130 struct proc_dir_entry *root_irq_dir; 131 132 root_irq_dir = proc_mkdir("irq", NULL); 133 create_prof_cpu_mask(root_irq_dir); 134 } 135 #endif 136