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