[linux-2.6-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
	1	# SPDX-License-Identifier: GPL-2.0-only
	2	menu "IRQ subsystem"
	3	# Options selectable by the architecture code
	4
	5	# Make sparse irq Kconfig switch below available
	6	config MAY_HAVE_SPARSE_IRQ
	7	bool
	8
	9	# Legacy support, required for itanic
	10	config GENERIC_IRQ_LEGACY
	11	bool
	12
	13	# Enable the generic irq autoprobe mechanism
	14	config GENERIC_IRQ_PROBE
	15	bool
	16
	17	# Use the generic /proc/interrupts implementation
	18	config GENERIC_IRQ_SHOW
	19	bool
	20
	21	# Print level/edge extra information
	22	config GENERIC_IRQ_SHOW_LEVEL
	23	bool
	24
	25	# Supports effective affinity mask
	26	config GENERIC_IRQ_EFFECTIVE_AFF_MASK
	27	depends on SMP
	28	bool
	29
	30	# Support for delayed migration from interrupt context
	31	config GENERIC_PENDING_IRQ
	32	bool
	33
	34	# Support for generic irq migrating off cpu before the cpu is offline.
	35	config GENERIC_IRQ_MIGRATION
	36	bool
	37
	38	# Alpha specific irq affinity mechanism
	39	config AUTO_IRQ_AFFINITY
	40	bool
	41
	42	# Interrupt injection mechanism
	43	config GENERIC_IRQ_INJECTION
	44	bool
	45
	46	# Tasklet based software resend for pending interrupts on enable_irq()
	47	config HARDIRQS_SW_RESEND
	48	bool
	49
	50	# Generic configurable interrupt chip implementation
	51	config GENERIC_IRQ_CHIP
	52	bool
	53	select IRQ_DOMAIN
	54
	55	# Generic irq_domain hw <--> linux irq number translation
	56	config IRQ_DOMAIN
	57	bool
	58
	59	# Support for simulated interrupts
	60	config IRQ_SIM
	61	bool
	62	select IRQ_WORK
	63	select IRQ_DOMAIN
	64
	65	# Support for hierarchical irq domains
	66	config IRQ_DOMAIN_HIERARCHY
	67	bool
	68	select IRQ_DOMAIN
	69
	70	# Support for obsolete non-mapping irq domains
	71	config IRQ_DOMAIN_NOMAP
	72	bool
	73	select IRQ_DOMAIN
	74
	75	# Support for hierarchical fasteoi+edge and fasteoi+level handlers
	76	config IRQ_FASTEOI_HIERARCHY_HANDLERS
	77	bool
	78
	79	# Generic IRQ IPI support
	80	config GENERIC_IRQ_IPI
	81	bool
	82	depends on SMP
	83	select IRQ_DOMAIN_HIERARCHY
	84
	85	# Generic IRQ IPI Mux support
	86	config GENERIC_IRQ_IPI_MUX
	87	bool
	88	depends on SMP
	89
	90	# Generic MSI hierarchical interrupt domain support
	91	config GENERIC_MSI_IRQ
	92	bool
	93	select IRQ_DOMAIN_HIERARCHY
	94
	95	# irqchip drivers should select this if they call iommu_dma_prepare_msi()
	96	config IRQ_MSI_IOMMU
	97	bool
	98
	99	config IRQ_TIMINGS
	100	bool
	101
	102	config GENERIC_IRQ_MATRIX_ALLOCATOR
	103	bool
	104
	105	config GENERIC_IRQ_RESERVATION_MODE
	106	bool
	107
	108	# Snapshot for interrupt statistics
	109	config GENERIC_IRQ_STAT_SNAPSHOT
	110	bool
	111
	112	# Support forced irq threading
	113	config IRQ_FORCED_THREADING
	114	bool
	115
	116	config SPARSE_IRQ
	117	bool "Support sparse irq numbering" if MAY_HAVE_SPARSE_IRQ
	118	help
	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
	129	config GENERIC_IRQ_DEBUGFS
	130	bool "Expose irq internals in debugfs"
	131	depends on DEBUG_FS
	132	select GENERIC_IRQ_INJECTION
	133	default n
	134	help
	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
	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
	147	endmenu
	148
	149	config GENERIC_IRQ_MULTI_HANDLER
	150	bool
	151	help
	152	Allow to specify the low level IRQ handler at run time.
	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