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 <<
43 config GENERIC_IRQ_INJECTION <<
44 bool <<
45 <<
46 # Tasklet based software resend for pending in 46 # Tasklet based software resend for pending interrupts on enable_irq()
47 config HARDIRQS_SW_RESEND 47 config HARDIRQS_SW_RESEND
48 bool 48 bool
49 49
>> 50 # Preflow handler support for fasteoi (sparc64)
>> 51 config IRQ_PREFLOW_FASTEOI
>> 52 bool
>> 53
50 # Edge style eoi based handler (cell) 54 # Edge style eoi based handler (cell)
51 config IRQ_EDGE_EOI_HANDLER 55 config IRQ_EDGE_EOI_HANDLER
52 bool 56 bool
53 57
54 # Generic configurable interrupt chip implemen 58 # Generic configurable interrupt chip implementation
55 config GENERIC_IRQ_CHIP 59 config GENERIC_IRQ_CHIP
56 bool 60 bool
57 select IRQ_DOMAIN 61 select IRQ_DOMAIN
58 62
59 # Generic irq_domain hw <--> linux irq number 63 # Generic irq_domain hw <--> linux irq number translation
60 config IRQ_DOMAIN 64 config IRQ_DOMAIN
61 bool 65 bool
62 66
63 # Support for simulated interrupts 67 # Support for simulated interrupts
64 config IRQ_SIM 68 config IRQ_SIM
65 bool 69 bool
66 select IRQ_WORK 70 select IRQ_WORK
67 select IRQ_DOMAIN <<
68 71
69 # Support for hierarchical irq domains 72 # Support for hierarchical irq domains
70 config IRQ_DOMAIN_HIERARCHY 73 config IRQ_DOMAIN_HIERARCHY
71 bool 74 bool
72 select IRQ_DOMAIN 75 select IRQ_DOMAIN
73 76
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 77 # Support for hierarchical fasteoi+edge and fasteoi+level handlers
80 config IRQ_FASTEOI_HIERARCHY_HANDLERS 78 config IRQ_FASTEOI_HIERARCHY_HANDLERS
81 bool 79 bool
82 80
83 # Generic IRQ IPI support 81 # Generic IRQ IPI support
84 config GENERIC_IRQ_IPI 82 config GENERIC_IRQ_IPI
85 bool 83 bool
86 depends on SMP <<
87 select IRQ_DOMAIN_HIERARCHY 84 select IRQ_DOMAIN_HIERARCHY
88 85
89 # Generic IRQ IPI Mux support !! 86 # Generic MSI interrupt support
90 config GENERIC_IRQ_IPI_MUX !! 87 config GENERIC_MSI_IRQ
91 bool 88 bool
92 depends on SMP <<
93 89
94 # Generic MSI hierarchical interrupt domain su 90 # Generic MSI hierarchical interrupt domain support
95 config GENERIC_MSI_IRQ !! 91 config GENERIC_MSI_IRQ_DOMAIN
96 bool 92 bool
97 select IRQ_DOMAIN_HIERARCHY 93 select IRQ_DOMAIN_HIERARCHY
>> 94 select GENERIC_MSI_IRQ
98 95
99 config IRQ_MSI_IOMMU 96 config IRQ_MSI_IOMMU
100 bool 97 bool
101 98
>> 99 config HANDLE_DOMAIN_IRQ
>> 100 bool
>> 101
102 config IRQ_TIMINGS 102 config IRQ_TIMINGS
103 bool 103 bool
104 104
105 config GENERIC_IRQ_MATRIX_ALLOCATOR 105 config GENERIC_IRQ_MATRIX_ALLOCATOR
106 bool 106 bool
107 107
108 config GENERIC_IRQ_RESERVATION_MODE 108 config GENERIC_IRQ_RESERVATION_MODE
109 bool 109 bool
110 110
111 # Snapshot for interrupt statistics <<
112 config GENERIC_IRQ_STAT_SNAPSHOT <<
113 bool <<
114 <<
115 # Support forced irq threading 111 # Support forced irq threading
116 config IRQ_FORCED_THREADING 112 config IRQ_FORCED_THREADING
117 bool 113 bool
118 114
119 config SPARSE_IRQ 115 config SPARSE_IRQ
120 bool "Support sparse irq numbering" if 116 bool "Support sparse irq numbering" if MAY_HAVE_SPARSE_IRQ
121 help !! 117 ---help---
122 118
123 Sparse irq numbering is useful for d 119 Sparse irq numbering is useful for distro kernels that want
124 to define a high CONFIG_NR_CPUS valu 120 to define a high CONFIG_NR_CPUS value but still want to have
125 low kernel memory footprint on small 121 low kernel memory footprint on smaller machines.
126 122
127 ( Sparse irqs can also be beneficial 123 ( Sparse irqs can also be beneficial on NUMA boxes, as they spread
128 out the interrupt descriptors in a 124 out the interrupt descriptors in a more NUMA-friendly way. )
129 125
130 If you don't know what to do here, s 126 If you don't know what to do here, say N.
131 127
132 config GENERIC_IRQ_DEBUGFS 128 config GENERIC_IRQ_DEBUGFS
133 bool "Expose irq internals in debugfs" 129 bool "Expose irq internals in debugfs"
134 depends on DEBUG_FS 130 depends on DEBUG_FS
135 select GENERIC_IRQ_INJECTION <<
136 default n 131 default n
137 help !! 132 ---help---
138 133
139 Exposes internal state information t 134 Exposes internal state information through debugfs. Mostly for
140 developers and debugging of hard to 135 developers and debugging of hard to diagnose interrupt problems.
141 136
142 If you don't know what to do here, s 137 If you don't know what to do here, say N.
143 138
144 endmenu 139 endmenu
145 140
146 config GENERIC_IRQ_MULTI_HANDLER 141 config GENERIC_IRQ_MULTI_HANDLER
147 bool 142 bool
148 help 143 help
149 Allow to specify the low level IRQ h 144 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 <<
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