1 files changed, 123 insertions, 131 deletions

diff --git a/arch/sh/kernel/irq.c b/arch/sh/kernel/irq.c
index c7ebd6aec95..65a1ecd77f9 100644
--- a/arch/sh/kernel/irq.c
+++ b/arch/sh/kernel/irq.c
@@ -11,11 +11,16 @@
 #include <linux/module.h>
 #include <linux/kernel_stat.h>
 #include <linux/seq_file.h>
-#include <asm/irq.h>
+#include <linux/ftrace.h>
+#include <linux/delay.h>
+#include <linux/ratelimit.h>
 #include <asm/processor.h>
+#include <asm/machvec.h>
 #include <asm/uaccess.h>
 #include <asm/thread_info.h>
-#include <asm/cpu/mmu_context.h>
+#include <cpu/mmu_context.h>
+
+atomic_t irq_err_count;
 
 /*
  * 'what should we do if we get a hw irq event on an illegal vector'.
@@ -24,44 +29,30 @@
  */
 void ack_bad_irq(unsigned int irq)
 {
+	atomic_inc(&irq_err_count);
 	printk("unexpected IRQ trap at vector %02x\n", irq);
 }
 
 #if defined(CONFIG_PROC_FS)
-int show_interrupts(struct seq_file *p, void *v)
+/*
+ * /proc/interrupts printing for arch specific interrupts
+ */
+int arch_show_interrupts(struct seq_file *p, int prec)
 {
-	int i = *(loff_t *) v, j;
-	struct irqaction * action;
-	unsigned long flags;
-
-	if (i == 0) {
-		seq_puts(p, "           ");
-		for_each_online_cpu(j)
-			seq_printf(p, "CPU%d       ",j);
-		seq_putc(p, '\n');
-	}
+	int j;
+
+	seq_printf(p, "%*s: ", prec, "NMI");
+	for_each_online_cpu(j)
+		seq_printf(p, "%10u ", irq_stat[j].__nmi_count);
+	seq_printf(p, "  Non-maskable interrupts\n");
+
+	seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
 
-	if (i < NR_IRQS) {
-		spin_lock_irqsave(&irq_desc[i].lock, flags);
-		action = irq_desc[i].action;
-		if (!action)
-			goto unlock;
-		seq_printf(p, "%3d: ",i);
-		seq_printf(p, "%10u ", kstat_irqs(i));
-		seq_printf(p, " %14s", irq_desc[i].chip->typename);
-		seq_printf(p, "  %s", action->name);
-
-		for (action=action->next; action; action = action->next)
-			seq_printf(p, ", %s", action->name);
-		seq_putc(p, '\n');
-unlock:
-		spin_unlock_irqrestore(&irq_desc[i].lock, flags);
-	}
 	return 0;
 }
 #endif
 
-#ifdef CONFIG_4KSTACKS
+#ifdef CONFIG_IRQSTACKS
 /*
  * per-CPU IRQ handling contexts (thread information and stack)
  */
@@ -70,57 +61,16 @@ union irq_ctx {
 	u32			stack[THREAD_SIZE/sizeof(u32)];
 };
 
-static union irq_ctx *hardirq_ctx[NR_CPUS];
-static union irq_ctx *softirq_ctx[NR_CPUS];
-#endif
+static union irq_ctx *hardirq_ctx[NR_CPUS] __read_mostly;
+static union irq_ctx *softirq_ctx[NR_CPUS] __read_mostly;
+
+static char softirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss;
+static char hardirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss;
 
-asmlinkage int do_IRQ(unsigned long r4, unsigned long r5,
-		      unsigned long r6, unsigned long r7,
-		      struct pt_regs regs)
+static inline void handle_one_irq(unsigned int irq)
 {
-	int irq = r4;
-#ifdef CONFIG_4KSTACKS
 	union irq_ctx *curctx, *irqctx;
-#endif
-
-	irq_enter();
-
-#ifdef CONFIG_DEBUG_STACKOVERFLOW
-	/* Debugging check for stack overflow: is there less than 1KB free? */
-	{
-		long sp;
-
-		__asm__ __volatile__ ("and r15, %0" :
-					"=r" (sp) : "0" (THREAD_SIZE - 1));
-
-		if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
-			printk("do_IRQ: stack overflow: %ld\n",
-			       sp - sizeof(struct thread_info));
-			dump_stack();
-		}
-	}
-#endif
 
-#ifdef CONFIG_CPU_HAS_INTEVT
-	__asm__ __volatile__ (
-#ifdef CONFIG_CPU_HAS_SR_RB
-		"stc	r2_bank, %0\n\t"
-#else
-		"mov.l	@%1, %0\n\t"
-#endif
-		"shlr2	%0\n\t"
-		"shlr2	%0\n\t"
-		"shlr	%0\n\t"
-		"add	#-16, %0\n\t"
-		: "=z" (irq), "=r" (r4)
-		: "1" (INTEVT)
-		: "memory"
-	);
-#endif
-
-	irq = irq_demux(irq);
-
-#ifdef CONFIG_4KSTACKS
 	curctx = (union irq_ctx *)current_thread_info();
 	irqctx = hardirq_ctx[smp_processor_id()];
 
@@ -137,41 +87,31 @@ asmlinkage int do_IRQ(unsigned long r4, unsigned long r5,
 		irqctx->tinfo.task = curctx->tinfo.task;
 		irqctx->tinfo.previous_sp = current_stack_pointer;
 
+		/*
+		 * Copy the softirq bits in preempt_count so that the
+		 * softirq checks work in the hardirq context.
+		 */
+		irqctx->tinfo.preempt_count =
+			(irqctx->tinfo.preempt_count & ~SOFTIRQ_MASK) |
+			(curctx->tinfo.preempt_count & SOFTIRQ_MASK);
+
 		__asm__ __volatile__ (
 			"mov	%0, r4		\n"
-			"mov	%1, r5		\n"
-			"mov	r15, r9		\n"
-			"jsr	@%2		\n"
+			"mov	r15, r8		\n"
+			"jsr	@%1		\n"
 			/* swith to the irq stack */
-			" mov	%3, r15		\n"
+			" mov	%2, r15		\n"
 			/* restore the stack (ring zero) */
-			"mov	r9, r15		\n"
+			"mov	r8, r15		\n"
 			: /* no outputs */
-			: "r" (irq), "r" (&regs), "r" (__do_IRQ), "r" (isp)
-			/* XXX: A somewhat excessive clobber list? -PFM */
+			: "r" (irq), "r" (generic_handle_irq), "r" (isp)
 			: "memory", "r0", "r1", "r2", "r3", "r4",
 			  "r5", "r6", "r7", "r8", "t", "pr"
 		);
 	} else
-#endif
-		__do_IRQ(irq, &regs);
-
-	irq_exit();
-
-	return 1;
+		generic_handle_irq(irq);
 }
 
-#ifdef CONFIG_4KSTACKS
-/*
- * These should really be __section__(".bss.page_aligned") as well, but
- * gcc's 3.0 and earlier don't handle that correctly.
- */
-static char softirq_stack[NR_CPUS * THREAD_SIZE]
-		__attribute__((__aligned__(THREAD_SIZE)));
-
-static char hardirq_stack[NR_CPUS * THREAD_SIZE]
-		__attribute__((__aligned__(THREAD_SIZE)));
-
 /*
  * allocate per-cpu stacks for hardirq and for softirq processing
  */
@@ -195,7 +135,7 @@ void irq_ctx_init(int cpu)
 	irqctx->tinfo.task		= NULL;
 	irqctx->tinfo.exec_domain	= NULL;
 	irqctx->tinfo.cpu		= cpu;
-	irqctx->tinfo.preempt_count	= SOFTIRQ_OFFSET;
+	irqctx->tinfo.preempt_count	= 0;
 	irqctx->tinfo.addr_limit	= MAKE_MM_SEG(0);
 
 	softirq_ctx[cpu] = irqctx;
@@ -209,45 +149,97 @@ void irq_ctx_exit(int cpu)
 	hardirq_ctx[cpu] = NULL;
 }
 
-extern asmlinkage void __do_softirq(void);
-
-asmlinkage void do_softirq(void)
+void do_softirq_own_stack(void)
 {
-	unsigned long flags;
 	struct thread_info *curctx;
 	union irq_ctx *irqctx;
 	u32 *isp;
 
-	if (in_interrupt())
-		return;
+	curctx = current_thread_info();
+	irqctx = softirq_ctx[smp_processor_id()];
+	irqctx->tinfo.task = curctx->task;
+	irqctx->tinfo.previous_sp = current_stack_pointer;
 
-	local_irq_save(flags);
+	/* build the stack frame on the softirq stack */
+	isp = (u32 *)((char *)irqctx + sizeof(*irqctx));
 
-	if (local_softirq_pending()) {
-		curctx = current_thread_info();
-		irqctx = softirq_ctx[smp_processor_id()];
-		irqctx->tinfo.task = curctx->task;
-		irqctx->tinfo.previous_sp = current_stack_pointer;
+	__asm__ __volatile__ (
+		"mov	r15, r9		\n"
+		"jsr	@%0		\n"
+		/* switch to the softirq stack */
+		" mov	%1, r15		\n"
+		/* restore the thread stack */
+		"mov	r9, r15		\n"
+		: /* no outputs */
+		: "r" (__do_softirq), "r" (isp)
+		: "memory", "r0", "r1", "r2", "r3", "r4",
+		  "r5", "r6", "r7", "r8", "r9", "r15", "t", "pr"
+	);
+}
+#else
+static inline void handle_one_irq(unsigned int irq)
+{
+	generic_handle_irq(irq);
+}
+#endif
 
-		/* build the stack frame on the softirq stack */
-		isp = (u32 *)((char *)irqctx + sizeof(*irqctx));
+asmlinkage __irq_entry int do_IRQ(unsigned int irq, struct pt_regs *regs)
+{
+	struct pt_regs *old_regs = set_irq_regs(regs);
 
-		__asm__ __volatile__ (
-			"mov	r15, r9		\n"
-			"jsr	@%0		\n"
-			/* switch to the softirq stack */
-			" mov	%1, r15		\n"
-			/* restore the thread stack */
-			"mov	r9, r15		\n"
-			: /* no outputs */
-			: "r" (__do_softirq), "r" (isp)
-			/* XXX: A somewhat excessive clobber list? -PFM */
-			: "memory", "r0", "r1", "r2", "r3", "r4",
-			  "r5", "r6", "r7", "r8", "r9", "r15", "t", "pr"
-		);
+	irq_enter();
+
+	irq = irq_demux(irq_lookup(irq));
+
+	if (irq != NO_IRQ_IGNORE) {
+		handle_one_irq(irq);
+		irq_finish(irq);
 	}
 
-	local_irq_restore(flags);
+	irq_exit();
+
+	set_irq_regs(old_regs);
+
+	return IRQ_HANDLED;
+}
+
+void __init init_IRQ(void)
+{
+	plat_irq_setup();
+
+	/* Perform the machine specific initialisation */
+	if (sh_mv.mv_init_irq)
+		sh_mv.mv_init_irq();
+
+	intc_finalize();
+
+	irq_ctx_init(smp_processor_id());
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+/*
+ * The CPU has been marked offline.  Migrate IRQs off this CPU.  If
+ * the affinity settings do not allow other CPUs, force them onto any
+ * available CPU.
+ */
+void migrate_irqs(void)
+{
+	unsigned int irq, cpu = smp_processor_id();
+
+	for_each_active_irq(irq) {
+		struct irq_data *data = irq_get_irq_data(irq);
+
+		if (data->node == cpu) {
+			unsigned int newcpu = cpumask_any_and(data->affinity,
+							      cpu_online_mask);
+			if (newcpu >= nr_cpu_ids) {
+				pr_info_ratelimited("IRQ%u no longer affine to CPU%u\n",
+						    irq, cpu);
+
+				cpumask_setall(data->affinity);
+			}
+			irq_set_affinity(irq, data->affinity);
+		}
+	}
 }
-EXPORT_SYMBOL(do_softirq);
 #endif