[mirror_ubuntu-jammy-kernel.git] / kernel / irq / Kconfig

# SPDX-License-Identifier: GPL-2.0-only
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

# Supports effective affinity mask
config GENERIC_IRQ_EFFECTIVE_AFF_MASK
       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

# Interrupt injection mechanism
config GENERIC_IRQ_INJECTION
	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 simulated interrupts
config IRQ_SIM
	bool
	select IRQ_WORK
	select IRQ_DOMAIN

# Support for hierarchical irq domains
config IRQ_DOMAIN_HIERARCHY
	bool
	select IRQ_DOMAIN

# Support for hierarchical fasteoi+edge and fasteoi+level handlers
config IRQ_FASTEOI_HIERARCHY_HANDLERS
	bool

# Generic IRQ IPI support
config GENERIC_IRQ_IPI
	bool

# 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 IRQ_MSI_IOMMU
	bool

config HANDLE_DOMAIN_IRQ
	bool

config IRQ_TIMINGS
	bool

config GENERIC_IRQ_MATRIX_ALLOCATOR
	bool

config GENERIC_IRQ_RESERVATION_MODE
	bool

# 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.

config GENERIC_IRQ_DEBUGFS
	bool "Expose irq internals in debugfs"
	depends on DEBUG_FS
	select GENERIC_IRQ_INJECTION
	default n
	---help---

	  Exposes internal state information through debugfs. Mostly for
	  developers and debugging of hard to diagnose interrupt problems.

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

endmenu

config GENERIC_IRQ_MULTI_HANDLER
	bool
	help
	  Allow to specify the low level IRQ handler at run time.
Commit	Line	Data
ec8f24b7	1	# SPDX-License-Identifier: GPL-2.0-only
d9817ebe	2	menu "IRQ subsystem"
d9817ebe	3	# Options selectable by the architecture code
c68fd4f3 TG	4
c68fd4f3 TG	5	# Make sparse irq Kconfig switch below available
2ed86b16	6	config MAY_HAVE_SPARSE_IRQ
fd4afaf3	7	bool
d9817ebe	8
c940e01c TG	9	# Legacy support, required for itanic
	10	config GENERIC_IRQ_LEGACY
	11	bool
	12
c68fd4f3	13	# Enable the generic irq autoprobe mechanism
d9817ebe	14	config GENERIC_IRQ_PROBE
fd4afaf3	15	bool
d9817ebe	16
c68fd4f3	17	# Use the generic /proc/interrupts implementation
c78b9b65	18	config GENERIC_IRQ_SHOW
fd4afaf3	19	bool
c78b9b65	20
ab7798ff TG	21	# Print level/edge extra information
	22	config GENERIC_IRQ_SHOW_LEVEL
	23	bool
	24
0d3f5425 TG	25	# Supports effective affinity mask
	26	config GENERIC_IRQ_EFFECTIVE_AFF_MASK
	27	bool
	28
7b6ef126 TG	29	# Facility to allocate a hardware interrupt. This is legacy support
	30	# and should not be used in new code. Use irq domains instead.
	31	config GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
	32	bool
	33
c68fd4f3	34	# Support for delayed migration from interrupt context
d9817ebe	35	config GENERIC_PENDING_IRQ
fd4afaf3	36	bool
d9817ebe	37
f1e0bb0a YY	38	# Support for generic irq migrating off cpu before the cpu is offline.
	39	config GENERIC_IRQ_MIGRATION
	40	bool
	41
c68fd4f3	42	# Alpha specific irq affinity mechanism
d9817ebe	43	config AUTO_IRQ_AFFINITY
fd4afaf3	44	bool
d9817ebe	45
acd26bcf TG	46	# Interrupt injection mechanism
	47	config GENERIC_IRQ_INJECTION
	48	bool
	49
c68fd4f3	50	# Tasklet based software resend for pending interrupts on enable_irq()
d9817ebe	51	config HARDIRQS_SW_RESEND
fd4afaf3	52	bool
d9817ebe	53
c68fd4f3	54	# Preflow handler support for fasteoi (sparc64)
78129576	55	config IRQ_PREFLOW_FASTEOI
fd4afaf3	56	bool
78129576	57
0521c8fb TG	58	# Edge style eoi based handler (cell)
	59	config IRQ_EDGE_EOI_HANDLER
	60	bool
	61
c42321c7 TG	62	# Generic configurable interrupt chip implementation
	63	config GENERIC_IRQ_CHIP
	64	bool
923fa4ea	65	select IRQ_DOMAIN
c42321c7	66
08a543ad GL	67	# Generic irq_domain hw <--> linux irq number translation
	68	config IRQ_DOMAIN
	69	bool
	70
b19af510 BG	71	# Support for simulated interrupts
	72	config IRQ_SIM
	73	bool
	74	select IRQ_WORK
337cbeb2	75	select IRQ_DOMAIN
b19af510	76
f8264e34 JL	77	# Support for hierarchical irq domains
	78	config IRQ_DOMAIN_HIERARCHY
	79	bool
	80	select IRQ_DOMAIN
	81
7703b08c DD	82	# Support for hierarchical fasteoi+edge and fasteoi+level handlers
	83	config IRQ_FASTEOI_HIERARCHY_HANDLERS
	84	bool
	85
379b6564 QY	86	# Generic IRQ IPI support
	87	config GENERIC_IRQ_IPI
	88	bool
	89
f3cf8bb0 JL	90	# Generic MSI interrupt support
	91	config GENERIC_MSI_IRQ
	92	bool
	93
	94	# Generic MSI hierarchical interrupt domain support
	95	config GENERIC_MSI_IRQ_DOMAIN
	96	bool
	97	select IRQ_DOMAIN_HIERARCHY
	98	select GENERIC_MSI_IRQ
	99
aaebdf8d JG	100	config IRQ_MSI_IOMMU
	101	bool
	102
76ba59f8 MZ	103	config HANDLE_DOMAIN_IRQ
	104	bool
	105
b2d3d61a DL	106	config IRQ_TIMINGS
	107	bool
	108
2f75d9e1 TG	109	config GENERIC_IRQ_MATRIX_ALLOCATOR
	110	bool
	111
2b5175c4 TG	112	config GENERIC_IRQ_RESERVATION_MODE
	113	bool
	114
c68fd4f3	115	# Support forced irq threading
8d32a307 TG	116	config IRQ_FORCED_THREADING
	117	bool
	118
d9817ebe	119	config SPARSE_IRQ
2ed86b16	120	bool "Support sparse irq numbering" if MAY_HAVE_SPARSE_IRQ
d9817ebe TG	121	---help---
	122
	123	Sparse irq numbering is useful for distro kernels that want
	124	to define a high CONFIG_NR_CPUS value but still want to have
	125	low kernel memory footprint on smaller machines.
	126
	127	( Sparse irqs can also be beneficial on NUMA boxes, as they spread
	128	out the interrupt descriptors in a more NUMA-friendly way. )
	129
	130	If you don't know what to do here, say N.
	131
087cdfb6 TG	132	config GENERIC_IRQ_DEBUGFS
	133	bool "Expose irq internals in debugfs"
	134	depends on DEBUG_FS
acd26bcf	135	select GENERIC_IRQ_INJECTION
087cdfb6 TG	136	default n
	137	---help---
	138
	139	Exposes internal state information through debugfs. Mostly for
	140	developers and debugging of hard to diagnose interrupt problems.
	141
	142	If you don't know what to do here, say N.
	143
d9817ebe	144	endmenu
caacdbf4 PD	145
	146	config GENERIC_IRQ_MULTI_HANDLER
	147	bool
	148	help
	149	Allow to specify the low level IRQ handler at run time.