IRQ resource deallocation[0/2]

diff -puN drivers/acpi/pci_irq.c~IRQ_deallocation_acpi drivers/acpi/pci_irq.c
@@ -407,3 +407,55 @@ acpi_pci_irq_enable (
 }
 EXPORT_SYMBOL(acpi_pci_irq_enable);
 
+
+#ifdef CONFIG_ACPI_DEALLOCATE_IRQ
+void
+acpi_pci_irq_disable (
+	struct pci_dev		*dev)
+{
+	u32			gsi = 0;
+	u8			pin = 0;
+	int			edge_level = ACPI_LEVEL_SENSITIVE;
+	int			active_high_low = ACPI_ACTIVE_LOW;
+
+	ACPI_FUNCTION_TRACE("acpi_pci_irq_disable");
+
+	if (!dev)
+		return_VOID;
+	
+	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
+	if (!pin)
+		return_VOID;
+	pin--;
+
+	if (!dev->bus)
+		return_VOID;
+
+	/* 
+	 * First we check the PCI IRQ routing table (PRT) for an IRQ.
+	 */
+ 	gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
+				  &edge_level, &active_high_low);
+	/*
+	 * If no PRT entry was found, we'll try to derive an IRQ from the
+	 * device's parent bridge.
+	 */
+	if (!gsi)
+ 		gsi = acpi_pci_irq_derive(dev, pin,
+					  &edge_level, &active_high_low);
+	if (!gsi)
+		return_VOID;
+
+	/*
+	 * TBD: It might be worth clearing dev->irq by magic constant
+	 * (e.g. PCI_UNDEFINED_IRQ).
+	 */
+
+	printk(KERN_INFO PREFIX "PCI interrupt for device %s disabled\n",
+	       pci_name(dev));
+
+	acpi_unregister_gsi(gsi);
+
+	return_VOID;
+}
+#endif /* CONFIG_ACPI_DEALLOCATE_IRQ */

diff -puN include/linux/acpi.h~IRQ_deallocation_acpi include/linux/acpi.h
@@ -416,6 +416,15 @@ static inline int acpi_boot_init(void)
 unsigned int acpi_register_gsi (u32 gsi, int edge_level, int active_high_low);
 int acpi_gsi_to_irq (u32 gsi, unsigned int *irq);
 
+/*
+ * This function undoes the effect of one call to acpi_register_gsi().
+ * If this matches the last registration, any IRQ resources for gsi
+ * are freed.
+ */
+#ifdef CONFIG_ACPI_DEALLOCATE_IRQ
+void acpi_unregister_gsi (u32 gsi);
+#endif
+
 #ifdef CONFIG_ACPI_PCI
 
 struct acpi_prt_entry {

@@ -441,6 +450,10 @@ struct pci_dev;
 int acpi_pci_irq_enable (struct pci_dev *dev);
 void acpi_penalize_isa_irq(int irq);
 
+#ifdef CONFIG_ACPI_DEALLOCATE_IRQ
+void acpi_pci_irq_disable (struct pci_dev *dev);
+#endif
+
 struct acpi_pci_driver {
 	struct acpi_pci_driver *next;
 	int (*add)(acpi_handle handle);

diff -puN arch/ia64/kernel/acpi.c~IRQ_deallocation_ia64 arch/ia64/kernel/acpi.c
@@ -517,6 +517,15 @@ acpi_register_gsi (u32 gsi, int edge_lev
 }
 EXPORT_SYMBOL(acpi_register_gsi);
 
+#ifdef CONFIG_ACPI_DEALLOCATE_IRQ
+void
+acpi_unregister_gsi (u32 gsi)
+{
+	iosapic_unregister_intr(gsi);
+}
+EXPORT_SYMBOL(acpi_unregister_gsi);
+#endif /* CONFIG_ACPI_DEALLOCATE_IRQ */
+
 static int __init
 acpi_parse_fadt (unsigned long phys_addr, unsigned long size)
 {

141 lines not on this page · raw message

diff -puN arch/ia64/kernel/irq.c~IRQ_deallocation_ia64 arch/ia64/kernel/irq.c
@@ -1030,6 +1030,9 @@ void move_irq(int irq)
 	irq_desc_t *desc = irq_descp(irq);
 	int redir = test_bit(irq, pending_irq_redir);
 
+	if (unlikely(!desc->handler->set_affinity))
+		return;
+
 	if (!cpus_empty(pending_irq_cpumask[irq])) {
 		cpus_and(tmp, pending_irq_cpumask[irq], cpu_online_map);
 		if (unlikely(!cpus_empty(tmp))) {

diff -puN arch/ia64/kernel/irq_ia64.c~IRQ_deallocation_ia64 arch/ia64/kernel/irq_ia64.c
@@ -75,15 +75,34 @@ irq_exit (void)
 	preempt_enable_no_resched();
 }
 
+static unsigned long ia64_vector_mask[BITS_TO_LONGS(IA64_NUM_DEVICE_VECTORS)];
+
 int
 assign_irq_vector (int irq)
 {
-	static int next_vector = IA64_FIRST_DEVICE_VECTOR;
-
-	if (next_vector > IA64_LAST_DEVICE_VECTOR)
+	int pos, vector;
+ again:
+	pos = find_first_zero_bit(ia64_vector_mask, IA64_NUM_DEVICE_VECTORS);
+	vector = IA64_FIRST_DEVICE_VECTOR + pos;
+	if (vector > IA64_LAST_DEVICE_VECTOR)
 		/* XXX could look for sharable vectors instead of panic'ing... */
 		panic("assign_irq_vector: out of interrupt vectors!");
-	return next_vector++;
+	if (test_and_set_bit(pos, ia64_vector_mask))
+		goto again;
+	return vector;
+}
+
+void
+free_irq_vector (int vector)
+{
+	int pos;
+
+	if (vector < IA64_FIRST_DEVICE_VECTOR || vector > IA64_LAST_DEVICE_VECTOR)
+		return;
+
+	pos = vector - IA64_FIRST_DEVICE_VECTOR;
+	if (!test_and_clear_bit(pos, ia64_vector_mask))
+		printk(KERN_WARNING "%s: double free!\n", __FUNCTION__);
 }
 
 extern unsigned int do_IRQ(unsigned long irq, struct pt_regs *regs);

diff -puN arch/ia64/pci/pci.c~IRQ_deallocation_ia64 arch/ia64/pci/pci.c
@@ -480,6 +480,14 @@ pcibios_enable_device (struct pci_dev *d
 	return acpi_pci_irq_enable(dev);
 }
 
+#ifdef CONFIG_ACPI_DEALLOCATE_IRQ
+void
+pcibios_disable_device (struct pci_dev *dev)
+{
+	acpi_pci_irq_disable(dev);
+}
+#endif /* CONFIG_ACPI_DEALLOCATE_IRQ */
+
 void
 pcibios_align_resource (void *data, struct resource *res,
 		        unsigned long size, unsigned long align)

diff -puN include/asm-ia64/hw_irq.h~IRQ_deallocation_ia64 include/asm-ia64/hw_irq.h
@@ -50,6 +50,7 @@ typedef u8 ia64_vector;
  */
 #define IA64_FIRST_DEVICE_VECTOR	0x30
 #define IA64_LAST_DEVICE_VECTOR		0xe7
+#define IA64_NUM_DEVICE_VECTORS		(IA64_LAST_DEVICE_VECTOR - IA64_FIRST_DEVICE_VECTOR + 1)
 
 #define IA64_MCA_RENDEZ_VECTOR		0xe8	/* MCA rendez interrupt */
 #define IA64_PERFMON_VECTOR		0xee	/* performanc monitor interrupt vector */

@@ -81,6 +82,7 @@ extern __u8 isa_irq_to_vector_map[16];
 extern struct hw_interrupt_type irq_type_ia64_lsapic;	/* CPU-internal interrupt controller */
 
 extern int assign_irq_vector (int irq);	/* allocate a free vector */
+extern void free_irq_vector (int vector);
 extern void ia64_send_ipi (int cpu, int vector, int delivery_mode, int redirect);
 extern void register_percpu_irq (ia64_vector vec, struct irqaction *action);
 

diff -puN include/asm-ia64/iosapic.h~IRQ_deallocation_ia64 include/asm-ia64/iosapic.h
@@ -78,6 +78,9 @@ extern int gsi_to_irq (unsigned int gsi)
 extern void iosapic_enable_intr (unsigned int vector);
 extern int iosapic_register_intr (unsigned int gsi, unsigned long polarity,
 				  unsigned long trigger);
+#ifdef CONFIG_ACPI_DEALLOCATE_IRQ
+extern void iosapic_unregister_intr (unsigned int irq);
+#endif
 extern void __init iosapic_override_isa_irq (unsigned int isa_irq, unsigned int gsi,
 				      unsigned long polarity,
 				      unsigned long trigger);

@@ -97,6 +100,7 @@ extern void __init map_iosapic_to_node (
 #define iosapic_system_init(pcat_compat)			do { } while (0)
 #define iosapic_init(address,gsi_base)				do { } while (0)
 #define iosapic_register_intr(gsi,polarity,trigger)		(gsi)
+#define iosapic_unregister_intr(irq)				do { } while (0)
 #define iosapic_override_isa_irq(isa_irq,gsi,polarity,trigger)	do { } while (0)
 #define iosapic_register_platform_intr(type,gsi,pmi,eid,id, \
 	polarity,trigger)					(gsi)