1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 menu "IRQ subsystem" 2 menu "IRQ subsystem"
3 # Options selectable by the architecture code 3 # Options selectable by the architecture code
4 4
5 # Make sparse irq Kconfig switch below availab 5 # Make sparse irq Kconfig switch below available
6 config MAY_HAVE_SPARSE_IRQ 6 config MAY_HAVE_SPARSE_IRQ
7 bool 7 bool
8 8
9 # Legacy support, required for itanic 9 # Legacy support, required for itanic
10 config GENERIC_IRQ_LEGACY 10 config GENERIC_IRQ_LEGACY
11 bool 11 bool
12 12
13 # Enable the generic irq autoprobe mechanism 13 # Enable the generic irq autoprobe mechanism
14 config GENERIC_IRQ_PROBE 14 config GENERIC_IRQ_PROBE
15 bool 15 bool
16 16
17 # Use the generic /proc/interrupts implementat 17 # Use the generic /proc/interrupts implementation
18 config GENERIC_IRQ_SHOW 18 config GENERIC_IRQ_SHOW
19 bool 19 bool
20 20
21 # Print level/edge extra information 21 # Print level/edge extra information
22 config GENERIC_IRQ_SHOW_LEVEL 22 config GENERIC_IRQ_SHOW_LEVEL
23 bool 23 bool
24 24
25 # Supports effective affinity mask 25 # Supports effective affinity mask
26 config GENERIC_IRQ_EFFECTIVE_AFF_MASK 26 config GENERIC_IRQ_EFFECTIVE_AFF_MASK
27 depends on SMP !! 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.
>> 31 config GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
28 bool 32 bool
29 33
30 # Support for delayed migration from interrupt 34 # Support for delayed migration from interrupt context
31 config GENERIC_PENDING_IRQ 35 config GENERIC_PENDING_IRQ
32 bool 36 bool
33 37
34 # Support for generic irq migrating off cpu be 38 # Support for generic irq migrating off cpu before the cpu is offline.
35 config GENERIC_IRQ_MIGRATION 39 config GENERIC_IRQ_MIGRATION
36 bool 40 bool
37 41
38 # Alpha specific irq affinity mechanism 42 # Alpha specific irq affinity mechanism
39 config AUTO_IRQ_AFFINITY 43 config AUTO_IRQ_AFFINITY
40 bool 44 bool
41 45
42 # Interrupt injection mechanism 46 # Interrupt injection mechanism
43 config GENERIC_IRQ_INJECTION 47 config GENERIC_IRQ_INJECTION
44 bool 48 bool
45 49
46 # Tasklet based software resend for pending in 50 # Tasklet based software resend for pending interrupts on enable_irq()
47 config HARDIRQS_SW_RESEND 51 config HARDIRQS_SW_RESEND
48 bool 52 bool
49 53
>> 54 # Preflow handler support for fasteoi (sparc64)
>> 55 config IRQ_PREFLOW_FASTEOI
>> 56 bool
>> 57
50 # Edge style eoi based handler (cell) 58 # Edge style eoi based handler (cell)
51 config IRQ_EDGE_EOI_HANDLER 59 config IRQ_EDGE_EOI_HANDLER
52 bool 60 bool
53 61
54 # Generic configurable interrupt chip implemen 62 # Generic configurable interrupt chip implementation
55 config GENERIC_IRQ_CHIP 63 config GENERIC_IRQ_CHIP
56 bool 64 bool
57 select IRQ_DOMAIN 65 select IRQ_DOMAIN
58 66
59 # Generic irq_domain hw <--> linux irq number 67 # Generic irq_domain hw <--> linux irq number translation
60 config IRQ_DOMAIN 68 config IRQ_DOMAIN
61 bool 69 bool
62 70
63 # Support for simulated interrupts 71 # Support for simulated interrupts
64 config IRQ_SIM 72 config IRQ_SIM
65 bool 73 bool
66 select IRQ_WORK 74 select IRQ_WORK
67 select IRQ_DOMAIN 75 select IRQ_DOMAIN
68 76
69 # Support for hierarchical irq domains 77 # Support for hierarchical irq domains
70 config IRQ_DOMAIN_HIERARCHY 78 config IRQ_DOMAIN_HIERARCHY
71 bool 79 bool
72 select IRQ_DOMAIN 80 select IRQ_DOMAIN
73 81
74 # Support for obsolete non-mapping irq domains <<
75 config IRQ_DOMAIN_NOMAP <<
76 bool <<
77 select IRQ_DOMAIN <<
78 <<
79 # Support for hierarchical fasteoi+edge and fa 82 # Support for hierarchical fasteoi+edge and fasteoi+level handlers
80 config IRQ_FASTEOI_HIERARCHY_HANDLERS 83 config IRQ_FASTEOI_HIERARCHY_HANDLERS
81 bool 84 bool
82 85
83 # Generic IRQ IPI support 86 # Generic IRQ IPI support
84 config GENERIC_IRQ_IPI 87 config GENERIC_IRQ_IPI
85 bool 88 bool
86 depends on SMP <<
87 select IRQ_DOMAIN_HIERARCHY <<
88 89
89 # Generic IRQ IPI Mux support !! 90 # Generic MSI interrupt support
90 config GENERIC_IRQ_IPI_MUX !! 91 config GENERIC_MSI_IRQ
91 bool 92 bool
92 depends on SMP <<
93 93
94 # Generic MSI hierarchical interrupt domain su 94 # Generic MSI hierarchical interrupt domain support
95 config GENERIC_MSI_IRQ !! 95 config GENERIC_MSI_IRQ_DOMAIN
96 bool 96 bool
97 select IRQ_DOMAIN_HIERARCHY 97 select IRQ_DOMAIN_HIERARCHY
>> 98 select GENERIC_MSI_IRQ
98 99
99 config IRQ_MSI_IOMMU 100 config IRQ_MSI_IOMMU
100 bool 101 bool
101 102
>> 103 config HANDLE_DOMAIN_IRQ
>> 104 bool
>> 105
102 config IRQ_TIMINGS 106 config IRQ_TIMINGS
103 bool 107 bool
104 108
105 config GENERIC_IRQ_MATRIX_ALLOCATOR 109 config GENERIC_IRQ_MATRIX_ALLOCATOR
106 bool 110 bool
107 111
108 config GENERIC_IRQ_RESERVATION_MODE 112 config GENERIC_IRQ_RESERVATION_MODE
109 bool 113 bool
110 114
111 # Snapshot for interrupt statistics <<
112 config GENERIC_IRQ_STAT_SNAPSHOT <<
113 bool <<
114 <<
115 # Support forced irq threading 115 # Support forced irq threading
116 config IRQ_FORCED_THREADING 116 config IRQ_FORCED_THREADING
117 bool 117 bool
118 118
119 config SPARSE_IRQ 119 config SPARSE_IRQ
120 bool "Support sparse irq numbering" if 120 bool "Support sparse irq numbering" if MAY_HAVE_SPARSE_IRQ
121 help 121 help
122 122
123 Sparse irq numbering is useful for d 123 Sparse irq numbering is useful for distro kernels that want
124 to define a high CONFIG_NR_CPUS valu 124 to define a high CONFIG_NR_CPUS value but still want to have
125 low kernel memory footprint on small 125 low kernel memory footprint on smaller machines.
126 126
127 ( Sparse irqs can also be beneficial 127 ( Sparse irqs can also be beneficial on NUMA boxes, as they spread
128 out the interrupt descriptors in a 128 out the interrupt descriptors in a more NUMA-friendly way. )
129 129
130 If you don't know what to do here, s 130 If you don't know what to do here, say N.
131 131
132 config GENERIC_IRQ_DEBUGFS 132 config GENERIC_IRQ_DEBUGFS
133 bool "Expose irq internals in debugfs" 133 bool "Expose irq internals in debugfs"
134 depends on DEBUG_FS 134 depends on DEBUG_FS
135 select GENERIC_IRQ_INJECTION 135 select GENERIC_IRQ_INJECTION
136 default n 136 default n
137 help 137 help
138 138
139 Exposes internal state information t 139 Exposes internal state information through debugfs. Mostly for
140 developers and debugging of hard to 140 developers and debugging of hard to diagnose interrupt problems.
141 141
142 If you don't know what to do here, s 142 If you don't know what to do here, say N.
143 143
144 endmenu 144 endmenu
145 145
146 config GENERIC_IRQ_MULTI_HANDLER 146 config GENERIC_IRQ_MULTI_HANDLER
147 bool 147 bool
148 help 148 help
149 Allow to specify the low level IRQ h 149 Allow to specify the low level IRQ handler at run time.
150 <<
151 # Cavium Octeon is the last system to use this <<
152 # Do not even think of enabling this on any ne <<
153 config DEPRECATED_IRQ_CPU_ONOFFLINE <<
154 bool <<
155 depends on CAVIUM_OCTEON_SOC <<
156 default CAVIUM_OCTEON_SOC <<
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.