From: Sebastian Ott <sebott@linux.vnet.ibm.com>
Date: Tue, 14 Feb 2017 18:13:09 +0100
Subject: s390: show statistics for MSI IRQs
Git-commit: 914b7dd07ee8713c69c31ddb3e19a76852a846ac
Patch-mainline: v5.2-rc1
References: jsc#SLE-5789 FATE#327042 bsc#1134730 LTC#173388

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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 arch/s390/include/asm/irq.h |    6 ++---
 arch/s390/kernel/irq.c      |   45 ++++++++++++++++++++++++++++++++++++--------
 arch/s390/pci/pci_irq.c     |    2 -
 drivers/s390/cio/cio.c      |    2 -
 4 files changed, 42 insertions(+), 13 deletions(-)

--- a/arch/s390/include/asm/irq.h
+++ b/arch/s390/include/asm/irq.h
@@ -46,7 +46,6 @@ enum interruption_class {
 	IRQEXT_CMC,
 	IRQEXT_FTP,
 	IRQIO_CIO,
-	IRQIO_QAI,
 	IRQIO_DAS,
 	IRQIO_C15,
 	IRQIO_C70,
@@ -54,12 +53,13 @@ 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,
 	NMI_NMI,
 	CPU_RST,
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -72,7 +72,6 @@ static const struct irq_class irqclass_s
 	{.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"},
@@ -80,13 +79,14 @@ static const struct irq_class irqclass_s
 	{.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_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 = NMI_NMI,    .name = "NMI", .desc = "[NMI] Machine Check"},
 	{.irq = CPU_RST,    .name = "RST", .desc = "[CPU] CPU Restart"},
 };
@@ -113,6 +113,34 @@ void do_IRQ(struct pt_regs *regs, int ir
 	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.
  */
@@ -125,7 +153,7 @@ int show_interrupts(struct seq_file *p,
 	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) {
@@ -136,9 +164,10 @@ int show_interrupts(struct seq_file *p,
 		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;
--- 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
 }
 
 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,
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -634,7 +634,7 @@ static irqreturn_t do_cio_interrupt(int
 }
 
 static struct irqaction io_interrupt = {
-	.name	 = "IO",
+	.name	 = "I/O",
 	.handler = do_cio_interrupt,
 };