X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=kernel%2Firq%2Fresend.c;fp=kernel%2Firq%2Fresend.c;h=35f10f7ff94aec43957fa71e7e97cf8f67b22b73;hb=f05f9504c50ed069377d37f02f22e7a16b5921de;hp=0000000000000000000000000000000000000000;hpb=16c70f8c1b54b61c3b951b6fb220df250fe09b32;p=linux-2.6.git

diff --git a/kernel/irq/resend.c b/kernel/irq/resend.c
new file mode 100644
index 000000000..35f10f7ff
--- /dev/null
+++ b/kernel/irq/resend.c
@@ -0,0 +1,77 @@
+/*
+ * linux/kernel/irq/resend.c
+ *
+ * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
+ * Copyright (C) 2005-2006, Thomas Gleixner
+ *
+ * This file contains the IRQ-resend code
+ *
+ * If the interrupt is waiting to be processed, we try to re-run it.
+ * We can't directly run it from here since the caller might be in an
+ * interrupt-protected region. Not all irq controller chips can
+ * retrigger interrupts at the hardware level, so in those cases
+ * we allow the resending of IRQs via a tasklet.
+ */
+
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/random.h>
+#include <linux/interrupt.h>
+
+#include "internals.h"
+
+#ifdef CONFIG_HARDIRQS_SW_RESEND
+
+/* Bitmap to handle software resend of interrupts: */
+static DECLARE_BITMAP(irqs_resend, NR_IRQS);
+
+/*
+ * Run software resends of IRQ's
+ */
+static void resend_irqs(unsigned long arg)
+{
+	struct irq_desc *desc;
+	int irq;
+
+	while (!bitmap_empty(irqs_resend, NR_IRQS)) {
+		irq = find_first_bit(irqs_resend, NR_IRQS);
+		clear_bit(irq, irqs_resend);
+		desc = irq_desc + irq;
+		local_irq_disable();
+		desc->handle_irq(irq, desc, NULL);
+		local_irq_enable();
+	}
+}
+
+/* Tasklet to handle resend: */
+static DECLARE_TASKLET(resend_tasklet, resend_irqs, 0);
+
+#endif
+
+/*
+ * IRQ resend
+ *
+ * Is called with interrupts disabled and desc->lock held.
+ */
+void check_irq_resend(struct irq_desc *desc, unsigned int irq)
+{
+	unsigned int status = desc->status;
+
+	/*
+	 * Make sure the interrupt is enabled, before resending it:
+	 */
+	desc->chip->enable(irq);
+
+	if ((status & (IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) {
+		desc->status = (status & ~IRQ_PENDING) | IRQ_REPLAY;
+
+		if (!desc->chip || !desc->chip->retrigger ||
+					!desc->chip->retrigger(irq)) {
+#ifdef CONFIG_HARDIRQS_SW_RESEND
+			/* Set it pending and activate the softirq: */
+			set_bit(irq, irqs_resend);
+			tasklet_schedule(&resend_tasklet);
+#endif
+		}
+	}
+}