[linux-block.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
       depends on SMP
       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

# 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 obsolete non-mapping irq domains
config IRQ_DOMAIN_NOMAP
	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
	depends on SMP
	select IRQ_DOMAIN_HIERARCHY

# Generic IRQ IPI Mux support
config GENERIC_IRQ_IPI_MUX
	bool
	depends on SMP

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

# irqchip drivers should select this if they call iommu_dma_prepare_msi()
config IRQ_MSI_IOMMU
	bool

config IRQ_TIMINGS
	bool

config GENERIC_IRQ_MATRIX_ALLOCATOR
	bool

config GENERIC_IRQ_RESERVATION_MODE
	bool

# Snapshot for interrupt statistics
config GENERIC_IRQ_STAT_SNAPSHOT
	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.

# Clear forwarded VM interrupts during kexec.
# This option ensures the kernel clears active states for interrupts
# forwarded to virtual machines (VMs) during a machine kexec.
config GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD
	bool

endmenu

config GENERIC_IRQ_MULTI_HANDLER
	bool
	help
	  Allow to specify the low level IRQ handler at run time.

# Cavium Octeon is the last system to use this deprecated option
# Do not even think of enabling this on any new platform
config DEPRECATED_IRQ_CPU_ONOFFLINE
	bool
	depends on CAVIUM_OCTEON_SOC
	default CAVIUM_OCTEON_SOC
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
0d3f5425 TG	26	config GENERIC_IRQ_EFFECTIVE_AFF_MASK
0e6c027c	27	depends on SMP
0d3f5425 TG	28	bool
0d3f5425 TG	29
c68fd4f3	30	# Support for delayed migration from interrupt context
d9817ebe	31	config GENERIC_PENDING_IRQ
fd4afaf3	32	bool
d9817ebe	33
f1e0bb0a YY	34	# Support for generic irq migrating off cpu before the cpu is offline.
	35	config GENERIC_IRQ_MIGRATION
	36	bool
	37
c68fd4f3	38	# Alpha specific irq affinity mechanism
d9817ebe	39	config AUTO_IRQ_AFFINITY
fd4afaf3	40	bool
d9817ebe	41
acd26bcf TG	42	# Interrupt injection mechanism
	43	config GENERIC_IRQ_INJECTION
	44	bool
	45
c68fd4f3	46	# Tasklet based software resend for pending interrupts on enable_irq()
d9817ebe	47	config HARDIRQS_SW_RESEND
fd4afaf3	48	bool
d9817ebe	49
c42321c7 TG	50	# Generic configurable interrupt chip implementation
	51	config GENERIC_IRQ_CHIP
	52	bool
923fa4ea	53	select IRQ_DOMAIN
c42321c7	54
08a543ad GL	55	# Generic irq_domain hw <--> linux irq number translation
	56	config IRQ_DOMAIN
	57	bool
	58
b19af510 BG	59	# Support for simulated interrupts
	60	config IRQ_SIM
	61	bool
	62	select IRQ_WORK
337cbeb2	63	select IRQ_DOMAIN
b19af510	64
f8264e34 JL	65	# Support for hierarchical irq domains
	66	config IRQ_DOMAIN_HIERARCHY
	67	bool
	68	select IRQ_DOMAIN
	69
e37af801 MZ	70	# Support for obsolete non-mapping irq domains
	71	config IRQ_DOMAIN_NOMAP
	72	bool
	73	select IRQ_DOMAIN
	74
7703b08c DD	75	# Support for hierarchical fasteoi+edge and fasteoi+level handlers
	76	config IRQ_FASTEOI_HIERARCHY_HANDLERS
	77	bool
	78
379b6564 QY	79	# Generic IRQ IPI support
	80	config GENERIC_IRQ_IPI
	81	bool
0f5209fe	82	depends on SMP
151a5351	83	select IRQ_DOMAIN_HIERARCHY
379b6564	84
835a486c AP	85	# Generic IRQ IPI Mux support
	86	config GENERIC_IRQ_IPI_MUX
	87	bool
	88	depends on SMP
	89
f3cf8bb0	90	# Generic MSI hierarchical interrupt domain support
13e7accb	91	config GENERIC_MSI_IRQ
f3cf8bb0 JL	92	bool
f3cf8bb0 JL	93	select IRQ_DOMAIN_HIERARCHY
f3cf8bb0	94
96093fe5	95	# irqchip drivers should select this if they call iommu_dma_prepare_msi()
aaebdf8d JG	96	config IRQ_MSI_IOMMU
	97	bool
	98
b2d3d61a DL	99	config IRQ_TIMINGS
	100	bool
	101
2f75d9e1 TG	102	config GENERIC_IRQ_MATRIX_ALLOCATOR
	103	bool
	104
2b5175c4 TG	105	config GENERIC_IRQ_RESERVATION_MODE
	106	bool
	107
99cf63c5 BH	108	# Snapshot for interrupt statistics
	109	config GENERIC_IRQ_STAT_SNAPSHOT
	110	bool
	111
c68fd4f3	112	# Support forced irq threading
8d32a307 TG	113	config IRQ_FORCED_THREADING
	114	bool
	115
d9817ebe	116	config SPARSE_IRQ
2ed86b16	117	bool "Support sparse irq numbering" if MAY_HAVE_SPARSE_IRQ
a7f7f624	118	help
d9817ebe TG	119
	120	Sparse irq numbering is useful for distro kernels that want
	121	to define a high CONFIG_NR_CPUS value but still want to have
	122	low kernel memory footprint on smaller machines.
	123
	124	( Sparse irqs can also be beneficial on NUMA boxes, as they spread
	125	out the interrupt descriptors in a more NUMA-friendly way. )
	126
	127	If you don't know what to do here, say N.
	128
087cdfb6 TG	129	config GENERIC_IRQ_DEBUGFS
	130	bool "Expose irq internals in debugfs"
	131	depends on DEBUG_FS
acd26bcf	132	select GENERIC_IRQ_INJECTION
087cdfb6	133	default n
a7f7f624	134	help
087cdfb6 TG	135
	136	Exposes internal state information through debugfs. Mostly for
	137	developers and debugging of hard to diagnose interrupt problems.
	138
	139	If you don't know what to do here, say N.
	140
bad6722e EF	141	# Clear forwarded VM interrupts during kexec.
	142	# This option ensures the kernel clears active states for interrupts
	143	# forwarded to virtual machines (VMs) during a machine kexec.
	144	config GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD
	145	bool
	146
d9817ebe	147	endmenu
caacdbf4 PD	148
	149	config GENERIC_IRQ_MULTI_HANDLER
	150	bool
	151	help
	152	Allow to specify the low level IRQ handler at run time.
8d15a729 MZ	153
	154	# Cavium Octeon is the last system to use this deprecated option
	155	# Do not even think of enabling this on any new platform
	156	config DEPRECATED_IRQ_CPU_ONOFFLINE
	157	bool
	158	depends on CAVIUM_OCTEON_SOC
	159	default CAVIUM_OCTEON_SOC