[linux-2.6-block.git] / kernel / irq / Kconfig

menu "IRQ subsystem"
# Options selectable by the architecture code

# Make sparse irq Kconfig switch below available
config MAY_HAVE_SPARSE_IRQ
       bool

# Legacy support, required for itanic
config GENERIC_IRQ_LEGACY
       bool

# Enable the generic irq autoprobe mechanism
config GENERIC_IRQ_PROBE
	bool

# Use the generic /proc/interrupts implementation
config GENERIC_IRQ_SHOW
       bool

# Print level/edge extra information
config GENERIC_IRQ_SHOW_LEVEL
       bool

# Facility to allocate a hardware interrupt. This is legacy support
# and should not be used in new code. Use irq domains instead.
config GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
       bool

# Support for delayed migration from interrupt context
config GENERIC_PENDING_IRQ
	bool

# Support for generic irq migrating off cpu before the cpu is offline.
config GENERIC_IRQ_MIGRATION
	bool

# Alpha specific irq affinity mechanism
config AUTO_IRQ_AFFINITY
       bool

# Tasklet based software resend for pending interrupts on enable_irq()
config HARDIRQS_SW_RESEND
       bool

# Preflow handler support for fasteoi (sparc64)
config IRQ_PREFLOW_FASTEOI
       bool

# Edge style eoi based handler (cell)
config IRQ_EDGE_EOI_HANDLER
       bool

# Generic configurable interrupt chip implementation
config GENERIC_IRQ_CHIP
       bool
       select IRQ_DOMAIN

# Generic irq_domain hw <--> linux irq number translation
config IRQ_DOMAIN
	bool

# Support for hierarchical irq domains
config IRQ_DOMAIN_HIERARCHY
	bool
	select IRQ_DOMAIN

# Generic MSI interrupt support
config GENERIC_MSI_IRQ
	bool

# Generic MSI hierarchical interrupt domain support
config GENERIC_MSI_IRQ_DOMAIN
	bool
	select IRQ_DOMAIN_HIERARCHY
	select GENERIC_MSI_IRQ

config HANDLE_DOMAIN_IRQ
	bool

config IRQ_DOMAIN_DEBUG
	bool "Expose hardware/virtual IRQ mapping via debugfs"
	depends on IRQ_DOMAIN && DEBUG_FS
	help
	  This option will show the mapping relationship between hardware irq
	  numbers and Linux irq numbers. The mapping is exposed via debugfs
	  in the file "irq_domain_mapping".

	  If you don't know what this means you don't need it.

# Support forced irq threading
config IRQ_FORCED_THREADING
       bool

config SPARSE_IRQ
	bool "Support sparse irq numbering" if MAY_HAVE_SPARSE_IRQ
	---help---

	  Sparse irq numbering is useful for distro kernels that want
	  to define a high CONFIG_NR_CPUS value but still want to have
	  low kernel memory footprint on smaller machines.

	  ( Sparse irqs can also be beneficial on NUMA boxes, as they spread
	    out the interrupt descriptors in a more NUMA-friendly way. )

	  If you don't know what to do here, say N.

endmenu
Commit	Line	Data
d9817ebe	1	menu "IRQ subsystem"
d9817ebe	2	# Options selectable by the architecture code
c68fd4f3 TG	3
c68fd4f3 TG	4	# Make sparse irq Kconfig switch below available
2ed86b16	5	config MAY_HAVE_SPARSE_IRQ
fd4afaf3	6	bool
d9817ebe	7
c940e01c TG	8	# Legacy support, required for itanic
	9	config GENERIC_IRQ_LEGACY
	10	bool
	11
c68fd4f3	12	# Enable the generic irq autoprobe mechanism
d9817ebe	13	config GENERIC_IRQ_PROBE
fd4afaf3	14	bool
d9817ebe	15
c68fd4f3	16	# Use the generic /proc/interrupts implementation
c78b9b65	17	config GENERIC_IRQ_SHOW
fd4afaf3	18	bool
c78b9b65	19
ab7798ff TG	20	# Print level/edge extra information
	21	config GENERIC_IRQ_SHOW_LEVEL
	22	bool
	23
7b6ef126 TG	24	# Facility to allocate a hardware interrupt. This is legacy support
	25	# and should not be used in new code. Use irq domains instead.
	26	config GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
	27	bool
	28
c68fd4f3	29	# Support for delayed migration from interrupt context
d9817ebe	30	config GENERIC_PENDING_IRQ
fd4afaf3	31	bool
d9817ebe	32
f1e0bb0a YY	33	# Support for generic irq migrating off cpu before the cpu is offline.
	34	config GENERIC_IRQ_MIGRATION
	35	bool
	36
c68fd4f3	37	# Alpha specific irq affinity mechanism
d9817ebe	38	config AUTO_IRQ_AFFINITY
fd4afaf3	39	bool
d9817ebe	40
c68fd4f3	41	# Tasklet based software resend for pending interrupts on enable_irq()
d9817ebe	42	config HARDIRQS_SW_RESEND
fd4afaf3	43	bool
d9817ebe	44
c68fd4f3	45	# Preflow handler support for fasteoi (sparc64)
78129576	46	config IRQ_PREFLOW_FASTEOI
fd4afaf3	47	bool
78129576	48
0521c8fb TG	49	# Edge style eoi based handler (cell)
	50	config IRQ_EDGE_EOI_HANDLER
	51	bool
	52
c42321c7 TG	53	# Generic configurable interrupt chip implementation
	54	config GENERIC_IRQ_CHIP
	55	bool
923fa4ea	56	select IRQ_DOMAIN
c42321c7	57
08a543ad GL	58	# Generic irq_domain hw <--> linux irq number translation
	59	config IRQ_DOMAIN
	60	bool
	61
f8264e34 JL	62	# Support for hierarchical irq domains
	63	config IRQ_DOMAIN_HIERARCHY
	64	bool
	65	select IRQ_DOMAIN
	66
f3cf8bb0 JL	67	# Generic MSI interrupt support
	68	config GENERIC_MSI_IRQ
	69	bool
	70
	71	# Generic MSI hierarchical interrupt domain support
	72	config GENERIC_MSI_IRQ_DOMAIN
	73	bool
	74	select IRQ_DOMAIN_HIERARCHY
	75	select GENERIC_MSI_IRQ
	76
76ba59f8 MZ	77	config HANDLE_DOMAIN_IRQ
	78	bool
	79
092b2fb0 GL	80	config IRQ_DOMAIN_DEBUG
	81	bool "Expose hardware/virtual IRQ mapping via debugfs"
	82	depends on IRQ_DOMAIN && DEBUG_FS
	83	help
	84	This option will show the mapping relationship between hardware irq
	85	numbers and Linux irq numbers. The mapping is exposed via debugfs
ac5830a3	86	in the file "irq_domain_mapping".
092b2fb0 GL	87
	88	If you don't know what this means you don't need it.
	89
c68fd4f3	90	# Support forced irq threading
8d32a307 TG	91	config IRQ_FORCED_THREADING
	92	bool
	93
d9817ebe	94	config SPARSE_IRQ
2ed86b16	95	bool "Support sparse irq numbering" if MAY_HAVE_SPARSE_IRQ
d9817ebe TG	96	---help---
	97
	98	Sparse irq numbering is useful for distro kernels that want
	99	to define a high CONFIG_NR_CPUS value but still want to have
	100	low kernel memory footprint on smaller machines.
	101
	102	( Sparse irqs can also be beneficial on NUMA boxes, as they spread
	103	out the interrupt descriptors in a more NUMA-friendly way. )
	104
	105	If you don't know what to do here, say N.
	106
	107	endmenu