1 files changed, 117 insertions, 124 deletions

diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index 9df824ea166..99b0b09646c 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -18,10 +18,12 @@
 #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);
@@ -33,7 +35,7 @@ struct irq_class {
 };
 
 /*
- * The list of "main" irq classes on s390. This is the list of interrrupts
+ * 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
@@ -42,9 +44,10 @@ struct irq_class {
  * 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"}
+static const struct irq_class irqclass_main_desc[NR_IRQS_BASE] = {
+	[EXT_INTERRUPT]  = {.name = "EXT"},
+	[IO_INTERRUPT]	 = {.name = "I/O"},
+	[THIN_INTERRUPT] = {.name = "AIO"},
 };
 
 /*
@@ -81,10 +84,33 @@ static const struct irq_class irqclass_sub_desc[NR_ARCH_IRQS] = {
 	[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.
  */
@@ -99,105 +125,88 @@ int show_interrupts(struct seq_file *p, void *v)
 		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)
+			goto out;
 		seq_printf(p, "%s: ", irqclass_main_desc[irq].name);
 		for_each_online_cpu(cpu)
-			seq_printf(p, "%10u ", kstat_cpu(cpu).irqs[irq]);
+			seq_printf(p, "%10u ", kstat_irqs_cpu(irq, cpu));
 		seq_putc(p, '\n');
-		goto skip_arch_irqs;
+		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]);
+			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:
+out:
 	put_online_cpus();
 	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;
+	BUILD_BUG_ON(!is_power_of_2(ARRAY_SIZE(ext_int_hash)));
+
+	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;
@@ -211,104 +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);
+			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, struct ext_code ext_code,
-			   unsigned int param32, unsigned long param64)
+static irqreturn_t do_ext_interrupt(int irq, void *dummy)
 {
-	struct pt_regs *old_regs;
+	struct pt_regs *regs = get_irq_regs();
+	struct ext_code ext_code;
 	struct ext_int_info *p;
 	int index;
 
-	old_regs = set_irq_regs(regs);
-	irq_enter();
-	if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) {
-		/* Serve timer interrupts first. */
-		clock_comparator_work();
-	}
-	kstat_incr_irqs_this_cpu(EXTERNAL_INTERRUPT, NULL);
-	if (ext_code.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(ext_code.code);
 	rcu_read_lock();
-	list_for_each_entry_rcu(p, &ext_int_hash[index], entry)
-		if (likely(p->code == ext_code.code))
-			p->handler(ext_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);
-}
-
-void __init init_IRQ(void)
-{
-	init_external_interrupts();
+	return IRQ_HANDLED;
 }
 
-static DEFINE_SPINLOCK(sc_irq_lock);
-static int sc_irq_refcount;
+static struct irqaction external_interrupt = {
+	.name	 = "EXT",
+	.handler = do_ext_interrupt,
+};
 
-void service_subclass_irq_register(void)
+void __init init_ext_interrupts(void)
 {
-	spin_lock(&sc_irq_lock);
-	if (!sc_irq_refcount)
-		ctl_set_bit(0, 9);
-	sc_irq_refcount++;
-	spin_unlock(&sc_irq_lock);
-}
-EXPORT_SYMBOL(service_subclass_irq_register);
+	int idx;
 
-void service_subclass_irq_unregister(void)
-{
-	spin_lock(&sc_irq_lock);
-	sc_irq_refcount--;
-	if (!sc_irq_refcount)
-		ctl_clear_bit(0, 9);
-	spin_unlock(&sc_irq_lock);
+	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);
 }
-EXPORT_SYMBOL(service_subclass_irq_unregister);
 
-static DEFINE_SPINLOCK(ma_subclass_lock);
-static int ma_subclass_refcount;
+static DEFINE_SPINLOCK(irq_subclass_lock);
+static unsigned char irq_subclass_refcount[64];
 
-void measurement_alert_subclass_register(void)
+void irq_subclass_register(enum irq_subclass subclass)
 {
-	spin_lock(&ma_subclass_lock);
-	if (!ma_subclass_refcount)
-		ctl_set_bit(0, 5);
-	ma_subclass_refcount++;
-	spin_unlock(&ma_subclass_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(measurement_alert_subclass_register);
+EXPORT_SYMBOL(irq_subclass_register);
 
-void measurement_alert_subclass_unregister(void)
+void irq_subclass_unregister(enum irq_subclass subclass)
 {
-	spin_lock(&ma_subclass_lock);
-	ma_subclass_refcount--;
-	if (!ma_subclass_refcount)
-		ctl_clear_bit(0, 5);
-	spin_unlock(&ma_subclass_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(measurement_alert_subclass_unregister);
+EXPORT_SYMBOL(irq_subclass_unregister);