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Diffstat (limited to 'arch/s390/kernel/irq.c')
-rw-r--r--arch/s390/kernel/irq.c341
1 files changed, 190 insertions, 151 deletions
diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index b9a7fdd9c81..99b0b09646c 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -1,5 +1,5 @@
/*
- * Copyright IBM Corp. 2004,2011
+ * Copyright IBM Corp. 2004, 2011
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
* Holger Smolinski <Holger.Smolinski@de.ibm.com>,
* Thomas Spatzier <tspat@de.ibm.com>,
@@ -18,161 +18,195 @@
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/cpu.h>
+#include <linux/irq.h>
#include <asm/irq_regs.h>
#include <asm/cputime.h>
#include <asm/lowcore.h>
#include <asm/irq.h>
+#include <asm/hw_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[] = {
- {.name = "EXT" },
- {.name = "I/O" },
- {.name = "CLK", .desc = "[EXT] Clock Comparator" },
- {.name = "EXC", .desc = "[EXT] External Call" },
- {.name = "EMS", .desc = "[EXT] Emergency Signal" },
- {.name = "TMR", .desc = "[EXT] CPU Timer" },
- {.name = "TAL", .desc = "[EXT] Timing Alert" },
- {.name = "PFL", .desc = "[EXT] Pseudo Page Fault" },
- {.name = "DSD", .desc = "[EXT] DASD Diag" },
- {.name = "VRT", .desc = "[EXT] Virtio" },
- {.name = "SCP", .desc = "[EXT] Service Call" },
- {.name = "IUC", .desc = "[EXT] IUCV" },
- {.name = "CPM", .desc = "[EXT] CPU Measurement" },
- {.name = "CIO", .desc = "[I/O] Common I/O Layer Interrupt" },
- {.name = "QAI", .desc = "[I/O] QDIO Adapter Interrupt" },
- {.name = "DAS", .desc = "[I/O] DASD" },
- {.name = "C15", .desc = "[I/O] 3215" },
- {.name = "C70", .desc = "[I/O] 3270" },
- {.name = "TAP", .desc = "[I/O] Tape" },
- {.name = "VMR", .desc = "[I/O] Unit Record Devices" },
- {.name = "LCS", .desc = "[I/O] LCS" },
- {.name = "CLW", .desc = "[I/O] CLAW" },
- {.name = "CTC", .desc = "[I/O] CTC" },
- {.name = "APB", .desc = "[I/O] AP Bus" },
- {.name = "CSC", .desc = "[I/O] CHSC Subchannel" },
- {.name = "NMI", .desc = "[NMI] Machine Check" },
+/*
+ * The list of "main" irq classes on s390. This is the list of interrupts
+ * 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_BASE] = {
+ [EXT_INTERRUPT] = {.name = "EXT"},
+ [IO_INTERRUPT] = {.name = "I/O"},
+ [THIN_INTERRUPT] = {.name = "AIO"},
};
/*
+ * 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" },
+ [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"},
+};
+
+void __init init_IRQ(void)
+{
+ init_cio_interrupts();
+ init_airq_interrupts();
+ init_ext_interrupts();
+}
+
+void do_IRQ(struct pt_regs *regs, int irq)
+{
+ struct pt_regs *old_regs;
+
+ old_regs = set_irq_regs(regs);
+ irq_enter();
+ if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
+ /* Serve timer interrupts first. */
+ clock_comparator_work();
+ generic_handle_irq(irq);
+ irq_exit();
+ set_irq_regs(old_regs);
+}
+
+/*
* show_interrupts is needed by /proc/interrupts.
*/
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');
+ goto out;
}
-
- 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) {
+ if (irq >= NR_IRQS_BASE)
+ goto out;
+ seq_printf(p, "%s: ", irqclass_main_desc[irq].name);
+ 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_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');
+ }
+out:
put_online_cpus();
- return 0;
+ return 0;
+}
+
+unsigned int arch_dynirq_lower_bound(unsigned int from)
+{
+ return from < THIN_INTERRUPT ? THIN_INTERRUPT : from;
}
/*
* Switch to the asynchronous interrupt stack for softirq execution.
*/
-asmlinkage void do_softirq(void)
+void do_softirq_own_stack(void)
{
- unsigned long flags, old, new;
-
- if (in_interrupt())
- return;
-
- local_irq_save(flags);
-
- if (local_softirq_pending()) {
- /* Get current stack pointer. */
- asm volatile("la %0,0(15)" : "=a" (old));
- /* Check against async. stack address range. */
- new = S390_lowcore.async_stack;
- if (((new - old) >> (PAGE_SHIFT + THREAD_ORDER)) != 0) {
- /* Need to switch to the async. stack. */
- new -= STACK_FRAME_OVERHEAD;
- ((struct stack_frame *) new)->back_chain = old;
-
- asm volatile(" la 15,0(%0)\n"
- " basr 14,%2\n"
- " la 15,0(%1)\n"
- : : "a" (new), "a" (old),
- "a" (__do_softirq)
- : "0", "1", "2", "3", "4", "5", "14",
- "cc", "memory" );
- } else
- /* We are already on the async stack. */
- __do_softirq();
+ unsigned long old, new;
+
+ /* Get current stack pointer. */
+ asm volatile("la %0,0(15)" : "=a" (old));
+ /* Check against async. stack address range. */
+ new = S390_lowcore.async_stack;
+ if (((new - old) >> (PAGE_SHIFT + THREAD_ORDER)) != 0) {
+ /* Need to switch to the async. stack. */
+ new -= STACK_FRAME_OVERHEAD;
+ ((struct stack_frame *) new)->back_chain = old;
+ asm volatile(" la 15,0(%0)\n"
+ " basr 14,%2\n"
+ " la 15,0(%1)\n"
+ : : "a" (new), "a" (old),
+ "a" (__do_softirq)
+ : "0", "1", "2", "3", "4", "5", "14",
+ "cc", "memory" );
+ } else {
+ /* We are already on the async stack. */
+ __do_softirq();
}
-
- local_irq_restore(flags);
}
-#ifdef CONFIG_PROC_FS
-void init_irq_proc(void)
-{
- struct proc_dir_entry *root_irq_dir;
-
- root_irq_dir = proc_mkdir("irq", NULL);
- create_prof_cpu_mask(root_irq_dir);
-}
-#endif
-
/*
* ext_int_hash[index] is the list head for all external interrupts that hash
* to this index.
*/
-static struct list_head ext_int_hash[256];
+static struct hlist_head ext_int_hash[32] ____cacheline_aligned;
struct ext_int_info {
ext_int_handler_t handler;
- u16 code;
- struct list_head entry;
+ struct hlist_node entry;
struct rcu_head rcu;
+ u16 code;
};
/* ext_int_hash_lock protects the handler lists for external interrupts */
-DEFINE_SPINLOCK(ext_int_hash_lock);
-
-static void __init init_external_interrupts(void)
-{
- int idx;
-
- for (idx = 0; idx < ARRAY_SIZE(ext_int_hash); idx++)
- INIT_LIST_HEAD(&ext_int_hash[idx]);
-}
+static DEFINE_SPINLOCK(ext_int_hash_lock);
static inline int ext_hash(u16 code)
{
- return (code + (code >> 9)) & 0xff;
-}
-
-static void ext_int_hash_update(struct rcu_head *head)
-{
- struct ext_int_info *p = container_of(head, struct ext_int_info, rcu);
+ BUILD_BUG_ON(!is_power_of_2(ARRAY_SIZE(ext_int_hash)));
- kfree(p);
+ return (code + (code >> 9)) & (ARRAY_SIZE(ext_int_hash) - 1);
}
-int register_external_interrupt(u16 code, ext_int_handler_t handler)
+int register_external_irq(u16 code, ext_int_handler_t handler)
{
struct ext_int_info *p;
unsigned long flags;
@@ -186,83 +220,88 @@ int register_external_interrupt(u16 code, ext_int_handler_t handler)
index = ext_hash(code);
spin_lock_irqsave(&ext_int_hash_lock, flags);
- list_add_rcu(&p->entry, &ext_int_hash[index]);
+ hlist_add_head_rcu(&p->entry, &ext_int_hash[index]);
spin_unlock_irqrestore(&ext_int_hash_lock, flags);
return 0;
}
-EXPORT_SYMBOL(register_external_interrupt);
+EXPORT_SYMBOL(register_external_irq);
-int unregister_external_interrupt(u16 code, ext_int_handler_t handler)
+int unregister_external_irq(u16 code, ext_int_handler_t handler)
{
struct ext_int_info *p;
unsigned long flags;
int index = ext_hash(code);
spin_lock_irqsave(&ext_int_hash_lock, flags);
- list_for_each_entry_rcu(p, &ext_int_hash[index], entry)
+ hlist_for_each_entry_rcu(p, &ext_int_hash[index], entry) {
if (p->code == code && p->handler == handler) {
- list_del_rcu(&p->entry);
- call_rcu(&p->rcu, ext_int_hash_update);
+ hlist_del_rcu(&p->entry);
+ kfree_rcu(p, rcu);
}
+ }
spin_unlock_irqrestore(&ext_int_hash_lock, flags);
return 0;
}
-EXPORT_SYMBOL(unregister_external_interrupt);
+EXPORT_SYMBOL(unregister_external_irq);
-void __irq_entry do_extint(struct pt_regs *regs, unsigned int ext_int_code,
- unsigned int param32, unsigned long param64)
+static irqreturn_t do_ext_interrupt(int irq, void *dummy)
{
- struct pt_regs *old_regs;
- unsigned short code;
+ struct pt_regs *regs = get_irq_regs();
+ struct ext_code ext_code;
struct ext_int_info *p;
int index;
- code = (unsigned short) ext_int_code;
- old_regs = set_irq_regs(regs);
- s390_idle_check(regs, S390_lowcore.int_clock,
- S390_lowcore.async_enter_timer);
- irq_enter();
- if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
- /* Serve timer interrupts first. */
- clock_comparator_work();
- kstat_cpu(smp_processor_id()).irqs[EXTERNAL_INTERRUPT]++;
- if (code != 0x1004)
+ ext_code = *(struct ext_code *) &regs->int_code;
+ if (ext_code.code != EXT_IRQ_CLK_COMP)
__get_cpu_var(s390_idle).nohz_delay = 1;
- index = ext_hash(code);
+ index = ext_hash(ext_code.code);
rcu_read_lock();
- list_for_each_entry_rcu(p, &ext_int_hash[index], entry)
- if (likely(p->code == code))
- p->handler(ext_int_code, param32, param64);
+ hlist_for_each_entry_rcu(p, &ext_int_hash[index], entry) {
+ if (unlikely(p->code != ext_code.code))
+ continue;
+ p->handler(ext_code, regs->int_parm, regs->int_parm_long);
+ }
rcu_read_unlock();
- irq_exit();
- set_irq_regs(old_regs);
+ return IRQ_HANDLED;
}
-void __init init_IRQ(void)
+static struct irqaction external_interrupt = {
+ .name = "EXT",
+ .handler = do_ext_interrupt,
+};
+
+void __init init_ext_interrupts(void)
{
- init_external_interrupts();
+ int idx;
+
+ for (idx = 0; idx < ARRAY_SIZE(ext_int_hash); idx++)
+ INIT_HLIST_HEAD(&ext_int_hash[idx]);
+
+ irq_set_chip_and_handler(EXT_INTERRUPT,
+ &dummy_irq_chip, handle_percpu_irq);
+ setup_irq(EXT_INTERRUPT, &external_interrupt);
}
-static DEFINE_SPINLOCK(sc_irq_lock);
-static int sc_irq_refcount;
+static DEFINE_SPINLOCK(irq_subclass_lock);
+static unsigned char irq_subclass_refcount[64];
-void service_subclass_irq_register(void)
+void irq_subclass_register(enum irq_subclass subclass)
{
- spin_lock(&sc_irq_lock);
- if (!sc_irq_refcount)
- ctl_set_bit(0, 9);
- sc_irq_refcount++;
- spin_unlock(&sc_irq_lock);
+ spin_lock(&irq_subclass_lock);
+ if (!irq_subclass_refcount[subclass])
+ ctl_set_bit(0, subclass);
+ irq_subclass_refcount[subclass]++;
+ spin_unlock(&irq_subclass_lock);
}
-EXPORT_SYMBOL(service_subclass_irq_register);
+EXPORT_SYMBOL(irq_subclass_register);
-void service_subclass_irq_unregister(void)
+void irq_subclass_unregister(enum irq_subclass subclass)
{
- spin_lock(&sc_irq_lock);
- sc_irq_refcount--;
- if (!sc_irq_refcount)
- ctl_clear_bit(0, 9);
- spin_unlock(&sc_irq_lock);
+ spin_lock(&irq_subclass_lock);
+ irq_subclass_refcount[subclass]--;
+ if (!irq_subclass_refcount[subclass])
+ ctl_clear_bit(0, subclass);
+ spin_unlock(&irq_subclass_lock);
}
-EXPORT_SYMBOL(service_subclass_irq_unregister);
+EXPORT_SYMBOL(irq_subclass_unregister);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 15:33:16 +0000