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