1 files changed, 75 insertions, 49 deletions

diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index bf24293970ce..9df824ea1667 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -24,43 +24,65 @@
 #include <asm/irq.h>
 #include "entry.h"
 
+DEFINE_PER_CPU_SHARED_ALIGNED(struct irq_stat, irq_stat);
+EXPORT_PER_CPU_SYMBOL_GPL(irq_stat);
+
 struct irq_class {
         char *name;
         char *desc;
 };
 
-static const struct irq_class intrclass_names[] = {
+/*
+ * The list of "main" irq classes on s390. This is the list of interrrupts
+ * that appear both in /proc/stat ("intr" line) and /proc/interrupts.
+ * Historically only external and I/O interrupts have been part of /proc/stat.
+ * We can't add the split external and I/O sub classes since the first field
+ * in the "intr" line in /proc/stat is supposed to be the sum of all other
+ * fields.
+ * Since the external and I/O interrupt fields are already sums we would end
+ * up with having a sum which accounts each interrupt twice.
+ */
+static const struct irq_class irqclass_main_desc[NR_IRQS] = {
         [EXTERNAL_INTERRUPT] = {.name = "EXT"},
-        [IO_INTERRUPT]       = {.name = "I/O"},
-        [EXTINT_CLK] = {.name = "CLK", .desc = "[EXT] Clock Comparator"},
-        [EXTINT_EXC] = {.name = "EXC", .desc = "[EXT] External Call"},
-        [EXTINT_EMS] = {.name = "EMS", .desc = "[EXT] Emergency Signal"},
-        [EXTINT_TMR] = {.name = "TMR", .desc = "[EXT] CPU Timer"},
-        [EXTINT_TLA] = {.name = "TAL", .desc = "[EXT] Timing Alert"},
-        [EXTINT_PFL] = {.name = "PFL", .desc = "[EXT] Pseudo Page Fault"},
-        [EXTINT_DSD] = {.name = "DSD", .desc = "[EXT] DASD Diag"},
-        [EXTINT_VRT] = {.name = "VRT", .desc = "[EXT] Virtio"},
-        [EXTINT_SCP] = {.name = "SCP", .desc = "[EXT] Service Call"},
-        [EXTINT_IUC] = {.name = "IUC", .desc = "[EXT] IUCV"},
-        [EXTINT_CMS] = {.name = "CMS", .desc = "[EXT] CPU-Measurement: Sampling"},
-        [EXTINT_CMC] = {.name = "CMC", .desc = "[EXT] CPU-Measurement: Counter"},
-        [EXTINT_CMR] = {.name = "CMR", .desc = "[EXT] CPU-Measurement: RI"},
-        [IOINT_CIO]  = {.name = "CIO", .desc = "[I/O] Common I/O Layer Interrupt"},
-        [IOINT_QAI]  = {.name = "QAI", .desc = "[I/O] QDIO Adapter Interrupt"},
-        [IOINT_DAS]  = {.name = "DAS", .desc = "[I/O] DASD"},
-        [IOINT_C15]  = {.name = "C15", .desc = "[I/O] 3215"},
-        [IOINT_C70]  = {.name = "C70", .desc = "[I/O] 3270"},
-        [IOINT_TAP]  = {.name = "TAP", .desc = "[I/O] Tape"},
-        [IOINT_VMR]  = {.name = "VMR", .desc = "[I/O] Unit Record Devices"},
-        [IOINT_LCS]  = {.name = "LCS", .desc = "[I/O] LCS"},
-        [IOINT_CLW]  = {.name = "CLW", .desc = "[I/O] CLAW"},
-        [IOINT_CTC]  = {.name = "CTC", .desc = "[I/O] CTC"},
-        [IOINT_APB]  = {.name = "APB", .desc = "[I/O] AP Bus"},
-        [IOINT_ADM]  = {.name = "ADM", .desc = "[I/O] EADM Subchannel"},
-        [IOINT_CSC]  = {.name = "CSC", .desc = "[I/O] CHSC Subchannel"},
-        [IOINT_PCI]  = {.name = "PCI", .desc = "[I/O] PCI Interrupt" },
-        [IOINT_MSI] =  {.name = "MSI", .desc = "[I/O] MSI Interrupt" },
+        [IO_INTERRUPT]       = {.name = "I/O"}
+};
+
+/*
+ * The list of split external and I/O interrupts that appear only in
+ * /proc/interrupts.
+ * In addition this list contains non external / I/O events like NMIs.
+ */
+static const struct irq_class irqclass_sub_desc[NR_ARCH_IRQS] = {
+        [IRQEXT_CLK] = {.name = "CLK", .desc = "[EXT] Clock Comparator"},
+        [IRQEXT_EXC] = {.name = "EXC", .desc = "[EXT] External Call"},
+        [IRQEXT_EMS] = {.name = "EMS", .desc = "[EXT] Emergency Signal"},
+        [IRQEXT_TMR] = {.name = "TMR", .desc = "[EXT] CPU Timer"},
+        [IRQEXT_TLA] = {.name = "TAL", .desc = "[EXT] Timing Alert"},
+        [IRQEXT_PFL] = {.name = "PFL", .desc = "[EXT] Pseudo Page Fault"},
+        [IRQEXT_DSD] = {.name = "DSD", .desc = "[EXT] DASD Diag"},
+        [IRQEXT_VRT] = {.name = "VRT", .desc = "[EXT] Virtio"},
+        [IRQEXT_SCP] = {.name = "SCP", .desc = "[EXT] Service Call"},
+        [IRQEXT_IUC] = {.name = "IUC", .desc = "[EXT] IUCV"},
+        [IRQEXT_CMS] = {.name = "CMS", .desc = "[EXT] CPU-Measurement: Sampling"},
+        [IRQEXT_CMC] = {.name = "CMC", .desc = "[EXT] CPU-Measurement: Counter"},
+        [IRQEXT_CMR] = {.name = "CMR", .desc = "[EXT] CPU-Measurement: RI"},
+        [IRQIO_CIO]  = {.name = "CIO", .desc = "[I/O] Common I/O Layer Interrupt"},
+        [IRQIO_QAI]  = {.name = "QAI", .desc = "[I/O] QDIO Adapter Interrupt"},
+        [IRQIO_DAS]  = {.name = "DAS", .desc = "[I/O] DASD"},
+        [IRQIO_C15]  = {.name = "C15", .desc = "[I/O] 3215"},
+        [IRQIO_C70]  = {.name = "C70", .desc = "[I/O] 3270"},
+        [IRQIO_TAP]  = {.name = "TAP", .desc = "[I/O] Tape"},
+        [IRQIO_VMR]  = {.name = "VMR", .desc = "[I/O] Unit Record Devices"},
+        [IRQIO_LCS]  = {.name = "LCS", .desc = "[I/O] LCS"},
+        [IRQIO_CLW]  = {.name = "CLW", .desc = "[I/O] CLAW"},
+        [IRQIO_CTC]  = {.name = "CTC", .desc = "[I/O] CTC"},
+        [IRQIO_APB]  = {.name = "APB", .desc = "[I/O] AP Bus"},
+        [IRQIO_ADM]  = {.name = "ADM", .desc = "[I/O] EADM Subchannel"},
+        [IRQIO_CSC]  = {.name = "CSC", .desc = "[I/O] CHSC Subchannel"},
+        [IRQIO_PCI]  = {.name = "PCI", .desc = "[I/O] PCI Interrupt" },
+        [IRQIO_MSI]  = {.name = "MSI", .desc = "[I/O] MSI Interrupt" },
         [NMI_NMI]    = {.name = "NMI", .desc = "[NMI] Machine Check"},
+        [CPU_RST]    = {.name = "RST", .desc = "[CPU] CPU Restart"},
 };
 
 /*
@@ -68,30 +90,34 @@ static const struct irq_class intrclass_names[] = {
  */
 int show_interrupts(struct seq_file *p, void *v)
 {
-        int i = *(loff_t *) v, j;
+        int irq = *(loff_t *) v;
+        int cpu;
 
         get_online_cpus();
-        if (i == 0) {
+        if (irq == 0) {
                 seq_puts(p, "           ");
-                for_each_online_cpu(j)
-                        seq_printf(p, "CPU%d       ",j);
+                for_each_online_cpu(cpu)
+                        seq_printf(p, "CPU%d       ", cpu);
                 seq_putc(p, '\n');
         }
-
-        if (i < NR_IRQS) {
-                seq_printf(p, "%s: ", intrclass_names[i].name);
-#ifndef CONFIG_SMP
-                seq_printf(p, "%10u ", kstat_irqs(i));
-#else
-                for_each_online_cpu(j)
-                        seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
-#endif
-                if (intrclass_names[i].desc)
-                        seq_printf(p, "  %s", intrclass_names[i].desc);
-                seq_putc(p, '\n');
-        }
+        if (irq < NR_IRQS) {
+                seq_printf(p, "%s: ", irqclass_main_desc[irq].name);
+                for_each_online_cpu(cpu)
+                        seq_printf(p, "%10u ", kstat_cpu(cpu).irqs[irq]);
+                seq_putc(p, '\n');
+                goto skip_arch_irqs;
+        }
+        for (irq = 0; irq < NR_ARCH_IRQS; irq++) {
+                seq_printf(p, "%s: ", irqclass_sub_desc[irq].name);
+                for_each_online_cpu(cpu)
+                        seq_printf(p, "%10u ", per_cpu(irq_stat, cpu).irqs[irq]);
+                if (irqclass_sub_desc[irq].desc)
+                        seq_printf(p, "  %s", irqclass_sub_desc[irq].desc);
+                seq_putc(p, '\n');
+        }
+skip_arch_irqs:
         put_online_cpus();
-        return 0;
+        return 0;
 }
 
 /*
@@ -222,7 +248,7 @@ void __irq_entry do_extint(struct pt_regs *regs, struct ext_code ext_code,
                 /* Serve timer interrupts first. */
                 clock_comparator_work();
         }
-        kstat_cpu(smp_processor_id()).irqs[EXTERNAL_INTERRUPT]++;
+        kstat_incr_irqs_this_cpu(EXTERNAL_INTERRUPT, NULL);
         if (ext_code.code != 0x1004)
                 __get_cpu_var(s390_idle).nohz_delay = 1;