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authorHendrik Brueckner <brueckner@linux.vnet.ibm.com>2014-07-22 16:58:52 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2014-07-28 10:02:36 +0200
commite2213e04c1b1e44a09a9d05b79809b7e63c9217e (patch)
tree9b049b184a56d4f635caeaf85edf28df39459d90 /arch/s390/kernel/irq.c
parentdc295880c6752076f8b94ba3885d0bfff09e3e82 (diff)
s390/irq: improve displayed interrupt order in /proc/interrupts
Rework the irqclass_main_desc and irqclass_sub_desc data structures which are used to report detaild IRQ statistics in /proc/interrupts. When called from the procfs ops, the entries in the structures are processed one by one. The index of an IRQ in the structures is identical to its definition in the "enum interruption_class". To control and (re)order the displayed sequence, introduce an irq member in each entry. This helps to display related IRQs together without changing the assigned number in the interruption_class enumeration. That means, adding and displaying new IRQs are independent. Finally, this new behavior improves to maintain a kernel ABI. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/irq.c')
-rw-r--r--arch/s390/kernel/irq.c95
1 files changed, 50 insertions, 45 deletions
diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index 99b0b09646ca..8eb82443cfbd 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -30,6 +30,7 @@ DEFINE_PER_CPU_SHARED_ALIGNED(struct irq_stat, irq_stat);
EXPORT_PER_CPU_SYMBOL_GPL(irq_stat);
struct irq_class {
+ int irq;
char *name;
char *desc;
};
@@ -45,9 +46,9 @@ struct irq_class {
* up with having a sum which accounts each interrupt twice.
*/
static const struct irq_class irqclass_main_desc[NR_IRQS_BASE] = {
- [EXT_INTERRUPT] = {.name = "EXT"},
- [IO_INTERRUPT] = {.name = "I/O"},
- [THIN_INTERRUPT] = {.name = "AIO"},
+ {.irq = EXT_INTERRUPT, .name = "EXT"},
+ {.irq = IO_INTERRUPT, .name = "I/O"},
+ {.irq = THIN_INTERRUPT, .name = "AIO"},
};
/*
@@ -56,38 +57,38 @@ static const struct irq_class irqclass_main_desc[NR_IRQS_BASE] = {
* 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" },
- [IRQIO_VIR] = {.name = "VIR", .desc = "[I/O] Virtual I/O Devices"},
- [IRQIO_VAI] = {.name = "VAI", .desc = "[I/O] Virtual I/O Devices AI"},
- [NMI_NMI] = {.name = "NMI", .desc = "[NMI] Machine Check"},
- [CPU_RST] = {.name = "RST", .desc = "[CPU] CPU Restart"},
+ {.irq = IRQEXT_CLK, .name = "CLK", .desc = "[EXT] Clock Comparator"},
+ {.irq = IRQEXT_EXC, .name = "EXC", .desc = "[EXT] External Call"},
+ {.irq = IRQEXT_EMS, .name = "EMS", .desc = "[EXT] Emergency Signal"},
+ {.irq = IRQEXT_TMR, .name = "TMR", .desc = "[EXT] CPU Timer"},
+ {.irq = IRQEXT_TLA, .name = "TAL", .desc = "[EXT] Timing Alert"},
+ {.irq = IRQEXT_PFL, .name = "PFL", .desc = "[EXT] Pseudo Page Fault"},
+ {.irq = IRQEXT_DSD, .name = "DSD", .desc = "[EXT] DASD Diag"},
+ {.irq = IRQEXT_VRT, .name = "VRT", .desc = "[EXT] Virtio"},
+ {.irq = IRQEXT_SCP, .name = "SCP", .desc = "[EXT] Service Call"},
+ {.irq = IRQEXT_IUC, .name = "IUC", .desc = "[EXT] IUCV"},
+ {.irq = IRQEXT_CMS, .name = "CMS", .desc = "[EXT] CPU-Measurement: Sampling"},
+ {.irq = IRQEXT_CMC, .name = "CMC", .desc = "[EXT] CPU-Measurement: Counter"},
+ {.irq = IRQEXT_CMR, .name = "CMR", .desc = "[EXT] CPU-Measurement: RI"},
+ {.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"},
+ {.irq = IRQIO_TAP, .name = "TAP", .desc = "[I/O] Tape"},
+ {.irq = IRQIO_VMR, .name = "VMR", .desc = "[I/O] Unit Record Devices"},
+ {.irq = IRQIO_LCS, .name = "LCS", .desc = "[I/O] LCS"},
+ {.irq = IRQIO_CLW, .name = "CLW", .desc = "[I/O] CLAW"},
+ {.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 = NMI_NMI, .name = "NMI", .desc = "[NMI] Machine Check"},
+ {.irq = CPU_RST, .name = "RST", .desc = "[CPU] CPU Restart"},
};
void __init init_IRQ(void)
@@ -116,33 +117,37 @@ void do_IRQ(struct pt_regs *regs, int irq)
*/
int show_interrupts(struct seq_file *p, void *v)
{
- int irq = *(loff_t *) v;
- int cpu;
+ int index = *(loff_t *) v;
+ int cpu, irq;
get_online_cpus();
- if (irq == 0) {
+ if (index == 0) {
seq_puts(p, " ");
for_each_online_cpu(cpu)
seq_printf(p, "CPU%d ", cpu);
seq_putc(p, '\n');
goto out;
}
- if (irq < NR_IRQS) {
- if (irq >= NR_IRQS_BASE)
+ if (index < NR_IRQS) {
+ if (index >= NR_IRQS_BASE)
goto out;
- seq_printf(p, "%s: ", irqclass_main_desc[irq].name);
+ /* Adjust index to process irqclass_main_desc array entries */
+ index--;
+ seq_printf(p, "%s: ", irqclass_main_desc[index].name);
+ irq = irqclass_main_desc[index].irq;
for_each_online_cpu(cpu)
seq_printf(p, "%10u ", kstat_irqs_cpu(irq, cpu));
seq_putc(p, '\n');
goto out;
}
- for (irq = 0; irq < NR_ARCH_IRQS; irq++) {
- seq_printf(p, "%s: ", irqclass_sub_desc[irq].name);
+ for (index = 0; index < NR_ARCH_IRQS; index++) {
+ seq_printf(p, "%s: ", irqclass_sub_desc[index].name);
+ irq = irqclass_sub_desc[index].irq;
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);
+ if (irqclass_sub_desc[index].desc)
+ seq_printf(p, " %s", irqclass_sub_desc[index].desc);
seq_putc(p, '\n');
}
out: