1 files changed, 179 insertions, 163 deletions

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 03099d521f5..a2b28a2fd7b 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -16,6 +16,8 @@
 #include <linux/interrupt.h>
 #include <linux/kernel_stat.h>
 
+#include <trace/events/irq.h>
+
 #include "internals.h"
 
 /**
@@ -26,7 +28,7 @@
 int irq_set_chip(unsigned int irq, struct irq_chip *chip)
 {
 	unsigned long flags;
-	struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
+	struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
 
 	if (!desc)
 		return -EINVAL;
@@ -34,15 +36,13 @@ int irq_set_chip(unsigned int irq, struct irq_chip *chip)
 	if (!chip)
 		chip = &no_irq_chip;
 
-	irq_chip_set_defaults(chip);
 	desc->irq_data.chip = chip;
 	irq_put_desc_unlock(desc, flags);
 	/*
 	 * For !CONFIG_SPARSE_IRQ make the irq show up in
-	 * allocated_irqs. For the CONFIG_SPARSE_IRQ case, it is
-	 * already marked, and this call is harmless.
+	 * allocated_irqs.
 	 */
-	irq_reserve_irq(irq);
+	irq_mark_irq(irq);
 	return 0;
 }
 EXPORT_SYMBOL(irq_set_chip);
@@ -55,15 +55,14 @@ EXPORT_SYMBOL(irq_set_chip);
 int irq_set_irq_type(unsigned int irq, unsigned int type)
 {
 	unsigned long flags;
-	struct irq_desc *desc = irq_get_desc_buslock(irq, &flags);
+	struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
 	int ret = 0;
 
 	if (!desc)
 		return -EINVAL;
 
 	type &= IRQ_TYPE_SENSE_MASK;
-	if (type != IRQ_TYPE_NONE)
-		ret = __irq_set_trigger(desc, irq, type);
+	ret = __irq_set_trigger(desc, irq, type);
 	irq_put_desc_busunlock(desc, flags);
 	return ret;
 }
@@ -79,7 +78,7 @@ EXPORT_SYMBOL(irq_set_irq_type);
 int irq_set_handler_data(unsigned int irq, void *data)
 {
 	unsigned long flags;
-	struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
+	struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
 
 	if (!desc)
 		return -EINVAL;
@@ -90,27 +89,41 @@ int irq_set_handler_data(unsigned int irq, void *data)
 EXPORT_SYMBOL(irq_set_handler_data);
 
 /**
- *	irq_set_msi_desc - set MSI descriptor data for an irq
- *	@irq:	Interrupt number
- *	@entry:	Pointer to MSI descriptor data
+ *	irq_set_msi_desc_off - set MSI descriptor data for an irq at offset
+ *	@irq_base:	Interrupt number base
+ *	@irq_offset:	Interrupt number offset
+ *	@entry:		Pointer to MSI descriptor data
  *
- *	Set the MSI descriptor entry for an irq
+ *	Set the MSI descriptor entry for an irq at offset
  */
-int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
+int irq_set_msi_desc_off(unsigned int irq_base, unsigned int irq_offset,
+			 struct msi_desc *entry)
 {
 	unsigned long flags;
-	struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
+	struct irq_desc *desc = irq_get_desc_lock(irq_base + irq_offset, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
 
 	if (!desc)
 		return -EINVAL;
 	desc->irq_data.msi_desc = entry;
-	if (entry)
-		entry->irq = irq;
+	if (entry && !irq_offset)
+		entry->irq = irq_base;
 	irq_put_desc_unlock(desc, flags);
 	return 0;
 }
 
 /**
+ *	irq_set_msi_desc - set MSI descriptor data for an irq
+ *	@irq:	Interrupt number
+ *	@entry:	Pointer to MSI descriptor data
+ *
+ *	Set the MSI descriptor entry for an irq
+ */
+int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
+{
+	return irq_set_msi_desc_off(irq, 0, entry);
+}
+
+/**
  *	irq_set_chip_data - set irq chip data for an irq
  *	@irq:	Interrupt number
  *	@data:	Pointer to chip specific data
@@ -120,7 +133,7 @@ int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
 int irq_set_chip_data(unsigned int irq, void *data)
 {
 	unsigned long flags;
-	struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
+	struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
 
 	if (!desc)
 		return -EINVAL;
@@ -141,40 +154,39 @@ EXPORT_SYMBOL_GPL(irq_get_irq_data);
 static void irq_state_clr_disabled(struct irq_desc *desc)
 {
 	irqd_clear(&desc->irq_data, IRQD_IRQ_DISABLED);
-	irq_compat_clr_disabled(desc);
 }
 
 static void irq_state_set_disabled(struct irq_desc *desc)
 {
 	irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
-	irq_compat_set_disabled(desc);
 }
 
 static void irq_state_clr_masked(struct irq_desc *desc)
 {
 	irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED);
-	irq_compat_clr_masked(desc);
 }
 
 static void irq_state_set_masked(struct irq_desc *desc)
 {
 	irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
-	irq_compat_set_masked(desc);
 }
 
-int irq_startup(struct irq_desc *desc)
+int irq_startup(struct irq_desc *desc, bool resend)
 {
+	int ret = 0;
+
 	irq_state_clr_disabled(desc);
 	desc->depth = 0;
 
 	if (desc->irq_data.chip->irq_startup) {
-		int ret = desc->irq_data.chip->irq_startup(&desc->irq_data);
+		ret = desc->irq_data.chip->irq_startup(&desc->irq_data);
 		irq_state_clr_masked(desc);
-		return ret;
+	} else {
+		irq_enable(desc);
 	}
-
-	irq_enable(desc);
-	return 0;
+	if (resend)
+		check_irq_resend(desc, desc->irq_data.irq);
+	return ret;
 }
 
 void irq_shutdown(struct irq_desc *desc)
@@ -183,7 +195,7 @@ void irq_shutdown(struct irq_desc *desc)
 	desc->depth = 1;
 	if (desc->irq_data.chip->irq_shutdown)
 		desc->irq_data.chip->irq_shutdown(&desc->irq_data);
-	if (desc->irq_data.chip->irq_disable)
+	else if (desc->irq_data.chip->irq_disable)
 		desc->irq_data.chip->irq_disable(&desc->irq_data);
 	else
 		desc->irq_data.chip->irq_mask(&desc->irq_data);
@@ -200,6 +212,19 @@ void irq_enable(struct irq_desc *desc)
 	irq_state_clr_masked(desc);
 }
 
+/**
+ * irq_disable - Mark interrupt disabled
+ * @desc:	irq descriptor which should be disabled
+ *
+ * If the chip does not implement the irq_disable callback, we
+ * use a lazy disable approach. That means we mark the interrupt
+ * disabled, but leave the hardware unmasked. That's an
+ * optimization because we avoid the hardware access for the
+ * common case where no interrupt happens after we marked it
+ * disabled. If an interrupt happens, then the interrupt flow
+ * handler masks the line at the hardware level and marks it
+ * pending.
+ */
 void irq_disable(struct irq_desc *desc)
 {
 	irq_state_set_disabled(desc);
@@ -209,124 +234,22 @@ void irq_disable(struct irq_desc *desc)
 	}
 }
 
-#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
-/* Temporary migration helpers */
-static void compat_irq_mask(struct irq_data *data)
-{
-	data->chip->mask(data->irq);
-}
-
-static void compat_irq_unmask(struct irq_data *data)
-{
-	data->chip->unmask(data->irq);
-}
-
-static void compat_irq_ack(struct irq_data *data)
-{
-	data->chip->ack(data->irq);
-}
-
-static void compat_irq_mask_ack(struct irq_data *data)
+void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu)
 {
-	data->chip->mask_ack(data->irq);
-}
-
-static void compat_irq_eoi(struct irq_data *data)
-{
-	data->chip->eoi(data->irq);
-}
-
-static void compat_irq_enable(struct irq_data *data)
-{
-	data->chip->enable(data->irq);
-}
-
-static void compat_irq_disable(struct irq_data *data)
-{
-	data->chip->disable(data->irq);
-}
-
-static void compat_irq_shutdown(struct irq_data *data)
-{
-	data->chip->shutdown(data->irq);
-}
-
-static unsigned int compat_irq_startup(struct irq_data *data)
-{
-	return data->chip->startup(data->irq);
-}
-
-static int compat_irq_set_affinity(struct irq_data *data,
-				   const struct cpumask *dest, bool force)
-{
-	return data->chip->set_affinity(data->irq, dest);
-}
-
-static int compat_irq_set_type(struct irq_data *data, unsigned int type)
-{
-	return data->chip->set_type(data->irq, type);
-}
-
-static int compat_irq_set_wake(struct irq_data *data, unsigned int on)
-{
-	return data->chip->set_wake(data->irq, on);
-}
-
-static int compat_irq_retrigger(struct irq_data *data)
-{
-	return data->chip->retrigger(data->irq);
-}
-
-static void compat_bus_lock(struct irq_data *data)
-{
-	data->chip->bus_lock(data->irq);
+	if (desc->irq_data.chip->irq_enable)
+		desc->irq_data.chip->irq_enable(&desc->irq_data);
+	else
+		desc->irq_data.chip->irq_unmask(&desc->irq_data);
+	cpumask_set_cpu(cpu, desc->percpu_enabled);
 }
 
-static void compat_bus_sync_unlock(struct irq_data *data)
+void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu)
 {
-	data->chip->bus_sync_unlock(data->irq);
-}
-#endif
-
-/*
- * Fixup enable/disable function pointers
- */
-void irq_chip_set_defaults(struct irq_chip *chip)
-{
-#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
-	if (chip->enable)
-		chip->irq_enable = compat_irq_enable;
-	if (chip->disable)
-		chip->irq_disable = compat_irq_disable;
-	if (chip->shutdown)
-		chip->irq_shutdown = compat_irq_shutdown;
-	if (chip->startup)
-		chip->irq_startup = compat_irq_startup;
-	if (!chip->end)
-		chip->end = dummy_irq_chip.end;
-	if (chip->bus_lock)
-		chip->irq_bus_lock = compat_bus_lock;
-	if (chip->bus_sync_unlock)
-		chip->irq_bus_sync_unlock = compat_bus_sync_unlock;
-	if (chip->mask)
-		chip->irq_mask = compat_irq_mask;
-	if (chip->unmask)
-		chip->irq_unmask = compat_irq_unmask;
-	if (chip->ack)
-		chip->irq_ack = compat_irq_ack;
-	if (chip->mask_ack)
-		chip->irq_mask_ack = compat_irq_mask_ack;
-	if (chip->eoi)
-		chip->irq_eoi = compat_irq_eoi;
-	if (chip->set_affinity)
-		chip->irq_set_affinity = compat_irq_set_affinity;
-	if (chip->set_type)
-		chip->irq_set_type = compat_irq_set_type;
-	if (chip->set_wake)
-		chip->irq_set_wake = compat_irq_set_wake;
-	if (chip->retrigger)
-		chip->irq_retrigger = compat_irq_retrigger;
-#endif
+	if (desc->irq_data.chip->irq_disable)
+		desc->irq_data.chip->irq_disable(&desc->irq_data);
+	else
+		desc->irq_data.chip->irq_mask(&desc->irq_data);
+	cpumask_clear_cpu(cpu, desc->percpu_enabled);
 }
 
 static inline void mask_ack_irq(struct irq_desc *desc)
@@ -357,6 +280,19 @@ void unmask_irq(struct irq_desc *desc)
 	}
 }
 
+void unmask_threaded_irq(struct irq_desc *desc)
+{
+	struct irq_chip *chip = desc->irq_data.chip;
+
+	if (chip->flags & IRQCHIP_EOI_THREADED)
+		chip->irq_eoi(&desc->irq_data);
+
+	if (chip->irq_unmask) {
+		chip->irq_unmask(&desc->irq_data);
+		irq_state_clr_masked(desc);
+	}
+}
+
 /*
  *	handle_nested_irq - Handle a nested irq from a irq thread
  *	@irq:	the interrupt number
@@ -375,13 +311,15 @@ void handle_nested_irq(unsigned int irq)
 
 	raw_spin_lock_irq(&desc->lock);
 
+	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 	kstat_incr_irqs_this_cpu(irq, desc);
 
 	action = desc->action;
-	if (unlikely(!action || irqd_irq_disabled(&desc->irq_data)))
+	if (unlikely(!action || irqd_irq_disabled(&desc->irq_data))) {
+		desc->istate |= IRQS_PENDING;
 		goto out_unlock;
+	}
 
-	irq_compat_set_progress(desc);
 	irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
 	raw_spin_unlock_irq(&desc->lock);
 
@@ -391,7 +329,6 @@ void handle_nested_irq(unsigned int irq)
 
 	raw_spin_lock_irq(&desc->lock);
 	irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
-	irq_compat_clr_progress(desc);
 
 out_unlock:
 	raw_spin_unlock_irq(&desc->lock);
@@ -429,14 +366,35 @@ handle_simple_irq(unsigned int irq, struct irq_desc *desc)
 	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 	kstat_incr_irqs_this_cpu(irq, desc);
 
-	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data)))
+	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
+		desc->istate |= IRQS_PENDING;
 		goto out_unlock;
+	}
 
 	handle_irq_event(desc);
 
 out_unlock:
 	raw_spin_unlock(&desc->lock);
 }
+EXPORT_SYMBOL_GPL(handle_simple_irq);
+
+/*
+ * Called unconditionally from handle_level_irq() and only for oneshot
+ * interrupts from handle_fasteoi_irq()
+ */
+static void cond_unmask_irq(struct irq_desc *desc)
+{
+	/*
+	 * We need to unmask in the following cases:
+	 * - Standard level irq (IRQF_ONESHOT is not set)
+	 * - Oneshot irq which did not wake the thread (caused by a
+	 *   spurious interrupt or a primary handler handling it
+	 *   completely).
+	 */
+	if (!irqd_irq_disabled(&desc->irq_data) &&
+	    irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot)
+		unmask_irq(desc);
+}
 
 /**
  *	handle_level_irq - Level type irq handler
@@ -465,13 +423,15 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc)
 	 * If its disabled or no action available
 	 * keep it masked and get out of here
 	 */
-	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data)))
+	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
+		desc->istate |= IRQS_PENDING;
 		goto out_unlock;
+	}
 
 	handle_irq_event(desc);
 
-	if (!irqd_irq_disabled(&desc->irq_data) && !(desc->istate & IRQS_ONESHOT))
-		unmask_irq(desc);
+	cond_unmask_irq(desc);
+
 out_unlock:
 	raw_spin_unlock(&desc->lock);
 }
@@ -487,6 +447,27 @@ static inline void preflow_handler(struct irq_desc *desc)
 static inline void preflow_handler(struct irq_desc *desc) { }
 #endif
 
+static void cond_unmask_eoi_irq(struct irq_desc *desc, struct irq_chip *chip)
+{
+	if (!(desc->istate & IRQS_ONESHOT)) {
+		chip->irq_eoi(&desc->irq_data);
+		return;
+	}
+	/*
+	 * We need to unmask in the following cases:
+	 * - Oneshot irq which did not wake the thread (caused by a
+	 *   spurious interrupt or a primary handler handling it
+	 *   completely).
+	 */
+	if (!irqd_irq_disabled(&desc->irq_data) &&
+	    irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot) {
+		chip->irq_eoi(&desc->irq_data);
+		unmask_irq(desc);
+	} else if (!(chip->flags & IRQCHIP_EOI_THREADED)) {
+		chip->irq_eoi(&desc->irq_data);
+	}
+}
+
 /**
  *	handle_fasteoi_irq - irq handler for transparent controllers
  *	@irq:	the interrupt number
@@ -500,6 +481,8 @@ static inline void preflow_handler(struct irq_desc *desc) { }
 void
 handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
 {
+	struct irq_chip *chip = desc->irq_data.chip;
+
 	raw_spin_lock(&desc->lock);
 
 	if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
@@ -514,7 +497,6 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
 	 * then mask it and get out of here:
 	 */
 	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
-		irq_compat_set_pending(desc);
 		desc->istate |= IRQS_PENDING;
 		mask_irq(desc);
 		goto out;
@@ -526,15 +508,14 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
 	preflow_handler(desc);
 	handle_irq_event(desc);
 
-out_eoi:
-	desc->irq_data.chip->irq_eoi(&desc->irq_data);
-out_unlock:
+	cond_unmask_eoi_irq(desc, chip);
+
 	raw_spin_unlock(&desc->lock);
 	return;
 out:
-	if (!(desc->irq_data.chip->flags & IRQCHIP_EOI_IF_HANDLED))
-		goto out_eoi;
-	goto out_unlock;
+	if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
+		chip->irq_eoi(&desc->irq_data);
+	raw_spin_unlock(&desc->lock);
 }
 
 /**
@@ -543,7 +524,7 @@ out:
  *	@desc:	the interrupt description structure for this irq
  *
  *	Interrupt occures on the falling and/or rising edge of a hardware
- *	signal. The occurence is latched into the irq controller hardware
+ *	signal. The occurrence is latched into the irq controller hardware
  *	and must be acked in order to be reenabled. After the ack another
  *	interrupt can happen on the same source even before the first one
  *	is handled by the associated event handler. If this happens it
@@ -567,7 +548,6 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
 	if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
 		     irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
 		if (!irq_check_poll(desc)) {
-			irq_compat_set_pending(desc);
 			desc->istate |= IRQS_PENDING;
 			mask_ack_irq(desc);
 			goto out_unlock;
@@ -603,6 +583,7 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
 out_unlock:
 	raw_spin_unlock(&desc->lock);
 }
+EXPORT_SYMBOL(handle_edge_irq);
 
 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
 /**
@@ -643,7 +624,7 @@ void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc)
 	} while ((desc->istate & IRQS_PENDING) &&
 		 !irqd_irq_disabled(&desc->irq_data));
 
-out_unlock:
+out_eoi:
 	chip->irq_eoi(&desc->irq_data);
 	raw_spin_unlock(&desc->lock);
 }
@@ -672,12 +653,44 @@ handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
 		chip->irq_eoi(&desc->irq_data);
 }
 
+/**
+ * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
+ * @irq:	the interrupt number
+ * @desc:	the interrupt description structure for this irq
+ *
+ * Per CPU interrupts on SMP machines without locking requirements. Same as
+ * handle_percpu_irq() above but with the following extras:
+ *
+ * action->percpu_dev_id is a pointer to percpu variables which
+ * contain the real device id for the cpu on which this handler is
+ * called
+ */
+void handle_percpu_devid_irq(unsigned int irq, struct irq_desc *desc)
+{
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	struct irqaction *action = desc->action;
+	void *dev_id = __this_cpu_ptr(action->percpu_dev_id);
+	irqreturn_t res;
+
+	kstat_incr_irqs_this_cpu(irq, desc);
+
+	if (chip->irq_ack)
+		chip->irq_ack(&desc->irq_data);
+
+	trace_irq_handler_entry(irq, action);
+	res = action->handler(irq, dev_id);
+	trace_irq_handler_exit(irq, action, res);
+
+	if (chip->irq_eoi)
+		chip->irq_eoi(&desc->irq_data);
+}
+
 void
 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 		  const char *name)
 {
 	unsigned long flags;
-	struct irq_desc *desc = irq_get_desc_buslock(irq, &flags);
+	struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
 
 	if (!desc)
 		return;
@@ -702,7 +715,8 @@ __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 	if (handle != handle_bad_irq && is_chained) {
 		irq_settings_set_noprobe(desc);
 		irq_settings_set_norequest(desc);
-		irq_startup(desc);
+		irq_settings_set_nothread(desc);
+		irq_startup(desc, true);
 	}
 out:
 	irq_put_desc_busunlock(desc, flags);
@@ -716,11 +730,12 @@ irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
 	irq_set_chip(irq, chip);
 	__irq_set_handler(irq, handle, 0, name);
 }
+EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name);
 
 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
 {
 	unsigned long flags;
-	struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
+	struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
 
 	if (!desc)
 		return;
@@ -741,6 +756,7 @@ void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
 
 	irq_put_desc_unlock(desc, flags);
 }
+EXPORT_SYMBOL_GPL(irq_modify_status);
 
 /**
  *	irq_cpu_online - Invoke all irq_cpu_online functions.