xref: /openbmc/linux/kernel/irq/Kconfig (revision 588b48ca) 
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# Facility to allocate a hardware interrupt. This is legacy support
25# and should not be used in new code. Use irq domains instead.
26config GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
27       bool
28
29# Support for delayed migration from interrupt context
30config GENERIC_PENDING_IRQ
31	bool
32
33# Alpha specific irq affinity mechanism
34config AUTO_IRQ_AFFINITY
35       bool
36
37# Tasklet based software resend for pending interrupts on enable_irq()
38config HARDIRQS_SW_RESEND
39       bool
40
41# Preflow handler support for fasteoi (sparc64)
42config IRQ_PREFLOW_FASTEOI
43       bool
44
45# Edge style eoi based handler (cell)
46config IRQ_EDGE_EOI_HANDLER
47       bool
48
49# Generic configurable interrupt chip implementation
50config GENERIC_IRQ_CHIP
51       bool
52       select IRQ_DOMAIN
53
54# Generic irq_domain hw <--> linux irq number translation
55config IRQ_DOMAIN
56	bool
57
58config IRQ_DOMAIN_DEBUG
59	bool "Expose hardware/virtual IRQ mapping via debugfs"
60	depends on IRQ_DOMAIN && DEBUG_FS
61	help
62	  This option will show the mapping relationship between hardware irq
63	  numbers and Linux irq numbers. The mapping is exposed via debugfs
64	  in the file "irq_domain_mapping".
65
66	  If you don't know what this means you don't need it.
67
68# Support forced irq threading
69config IRQ_FORCED_THREADING
70       bool
71
72config SPARSE_IRQ
73	bool "Support sparse irq numbering" if MAY_HAVE_SPARSE_IRQ
74	---help---
75
76	  Sparse irq numbering is useful for distro kernels that want
77	  to define a high CONFIG_NR_CPUS value but still want to have
78	  low kernel memory footprint on smaller machines.
79
80	  ( Sparse irqs can also be beneficial on NUMA boxes, as they spread
81	    out the interrupt descriptors in a more NUMA-friendly way. )
82
83	  If you don't know what to do here, say N.
84
85endmenu
86