s390: show statistics for MSI IRQs

Improve /proc/interrupts on s390 to show statistics for individual
MSI interrupts.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

4 files changed, 43 insertions, 14 deletions

diff --git a/arch/s390/include/asm/irq.h b/arch/s390/include/asm/irq.h
index afaf5e3c57fd..d15943944054 100644
--- a/arch/s390/include/asm/irq.h
+++ b/arch/s390/include/asm/irq.h
@@ -47,7 +47,6 @@ enum interruption_class {
         IRQEXT_CMC,
         IRQEXT_FTP,
         IRQIO_CIO,
-        IRQIO_QAI,
         IRQIO_DAS,
         IRQIO_C15,
         IRQIO_C70,
@@ -55,12 +54,13 @@ enum interruption_class {
         IRQIO_VMR,
         IRQIO_LCS,
         IRQIO_CTC,
-        IRQIO_APB,
         IRQIO_ADM,
         IRQIO_CSC,
+        IRQIO_VIR,
+        IRQIO_QAI,
+        IRQIO_APB,
         IRQIO_PCI,
         IRQIO_MSI,
-        IRQIO_VIR,
         IRQIO_VAI,
         IRQIO_GAL,
         NMI_NMI,
diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index 0cd5a5f96729..f586f94d3947 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -73,7 +73,6 @@ static const struct irq_class irqclass_sub_desc[] = {
         {.irq = IRQEXT_CMC, .name = "CMC", .desc = "[EXT] CPU-Measurement: Counter"},
         {.irq = IRQEXT_FTP, .name = "FTP", .desc = "[EXT] HMC FTP Service"},
         {.irq = IRQIO_CIO,  .name = "CIO", .desc = "[I/O] Common I/O Layer Interrupt"},
-        {.irq = IRQIO_QAI,  .name = "QAI", .desc = "[I/O] QDIO Adapter Interrupt"},
         {.irq = IRQIO_DAS,  .name = "DAS", .desc = "[I/O] DASD"},
         {.irq = IRQIO_C15,  .name = "C15", .desc = "[I/O] 3215"},
         {.irq = IRQIO_C70,  .name = "C70", .desc = "[I/O] 3270"},
@@ -81,14 +80,15 @@ static const struct irq_class irqclass_sub_desc[] = {
         {.irq = IRQIO_VMR,  .name = "VMR", .desc = "[I/O] Unit Record Devices"},
         {.irq = IRQIO_LCS,  .name = "LCS", .desc = "[I/O] LCS"},
         {.irq = IRQIO_CTC,  .name = "CTC", .desc = "[I/O] CTC"},
-        {.irq = IRQIO_APB,  .name = "APB", .desc = "[I/O] AP Bus"},
         {.irq = IRQIO_ADM,  .name = "ADM", .desc = "[I/O] EADM Subchannel"},
         {.irq = IRQIO_CSC,  .name = "CSC", .desc = "[I/O] CHSC Subchannel"},
-        {.irq = IRQIO_PCI,  .name = "PCI", .desc = "[I/O] PCI Interrupt" },
-        {.irq = IRQIO_MSI,  .name = "MSI", .desc = "[I/O] MSI Interrupt" },
         {.irq = IRQIO_VIR,  .name = "VIR", .desc = "[I/O] Virtual I/O Devices"},
-        {.irq = IRQIO_VAI,  .name = "VAI", .desc = "[I/O] Virtual I/O Devices AI"},
-        {.irq = IRQIO_GAL,  .name = "GAL", .desc = "[I/O] GIB Alert"},
+        {.irq = IRQIO_QAI,  .name = "QAI", .desc = "[AIO] QDIO Adapter Interrupt"},
+        {.irq = IRQIO_APB,  .name = "APB", .desc = "[AIO] AP Bus"},
+        {.irq = IRQIO_PCI,  .name = "PCI", .desc = "[AIO] PCI Interrupt"},
+        {.irq = IRQIO_MSI,  .name = "MSI", .desc = "[AIO] MSI Interrupt"},
+        {.irq = IRQIO_VAI,  .name = "VAI", .desc = "[AIO] Virtual I/O Devices AI"},
+        {.irq = IRQIO_GAL,  .name = "GAL", .desc = "[AIO] GIB Alert"},
         {.irq = NMI_NMI,    .name = "NMI", .desc = "[NMI] Machine Check"},
         {.irq = CPU_RST,    .name = "RST", .desc = "[CPU] CPU Restart"},
 };
@@ -116,6 +116,34 @@ void do_IRQ(struct pt_regs *regs, int irq)
         set_irq_regs(old_regs);
 }
 
+static void show_msi_interrupt(struct seq_file *p, int irq)
+{
+        struct irq_desc *desc;
+        unsigned long flags;
+        int cpu;
+
+        irq_lock_sparse();
+        desc = irq_to_desc(irq);
+        if (!desc)
+                goto out;
+
+        raw_spin_lock_irqsave(&desc->lock, flags);
+        seq_printf(p, "%3d: ", irq);
+        for_each_online_cpu(cpu)
+                seq_printf(p, "%10u ", kstat_irqs_cpu(irq, cpu));
+
+        if (desc->irq_data.chip)
+                seq_printf(p, " %8s", desc->irq_data.chip->name);
+
+        if (desc->action)
+                seq_printf(p, "  %s", desc->action->name);
+
+        seq_putc(p, '\n');
+        raw_spin_unlock_irqrestore(&desc->lock, flags);
+out:
+        irq_unlock_sparse();
+}
+
 /*
  * show_interrupts is needed by /proc/interrupts.
  */
@@ -128,7 +156,7 @@ int show_interrupts(struct seq_file *p, void *v)
         if (index == 0) {
                 seq_puts(p, "           ");
                 for_each_online_cpu(cpu)
-                        seq_printf(p, "CPU%d       ", cpu);
+                        seq_printf(p, "CPU%-8d", cpu);
                 seq_putc(p, '\n');
         }
         if (index < NR_IRQS_BASE) {
@@ -139,9 +167,10 @@ int show_interrupts(struct seq_file *p, void *v)
                 seq_putc(p, '\n');
                 goto out;
         }
-        if (index > NR_IRQS_BASE)
+        if (index < nr_irqs) {
+                show_msi_interrupt(p, index);
                 goto out;
-
+        }
         for (index = 0; index < NR_ARCH_IRQS; index++) {
                 seq_printf(p, "%s: ", irqclass_sub_desc[index].name);
                 irq = irqclass_sub_desc[index].irq;
diff --git a/arch/s390/pci/pci_irq.c b/arch/s390/pci/pci_irq.c
index 4bfd902f27f4..e7e3eab9a2b8 100644
--- a/arch/s390/pci/pci_irq.c
+++ b/arch/s390/pci/pci_irq.c
@@ -112,7 +112,7 @@ static int zpci_set_irq_affinity(struct irq_data *data, const struct cpumask *de
 }
 
 static struct irq_chip zpci_irq_chip = {
-        .name = "zPCI",
+        .name = "PCI-MSI",
         .irq_unmask = pci_msi_unmask_irq,
         .irq_mask = pci_msi_mask_irq,
         .irq_set_affinity = zpci_set_irq_affinity,
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index de744ca158fd..18f5458f90e8 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -564,7 +564,7 @@ static irqreturn_t do_cio_interrupt(int irq, void *dummy)
 }
 
 static struct irqaction io_interrupt = {
-        .name    = "IO",
+        .name    = "I/O",
         .handler = do_cio_interrupt,
 };