2 # Options selectable by the architecture code
4 # Make sparse irq Kconfig switch below available
5 config MAY_HAVE_SPARSE_IRQ
8 # Legacy support, required for itanic
9 config GENERIC_IRQ_LEGACY
12 # Enable the generic irq autoprobe mechanism
13 config GENERIC_IRQ_PROBE
16 # Use the generic /proc/interrupts implementation
17 config GENERIC_IRQ_SHOW
20 # Print level/edge extra information
21 config GENERIC_IRQ_SHOW_LEVEL
24 # Facility to allocate a hardware interrupt. This is legacy support
25 # and should not be used in new code. Use irq domains instead.
26 config GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
29 # Support for delayed migration from interrupt context
30 config GENERIC_PENDING_IRQ
33 # Support for generic irq migrating off cpu before the cpu is offline.
34 config GENERIC_IRQ_MIGRATION
37 # Alpha specific irq affinity mechanism
38 config AUTO_IRQ_AFFINITY
41 # Tasklet based software resend for pending interrupts on enable_irq()
42 config HARDIRQS_SW_RESEND
45 # Preflow handler support for fasteoi (sparc64)
46 config IRQ_PREFLOW_FASTEOI
49 # Edge style eoi based handler (cell)
50 config IRQ_EDGE_EOI_HANDLER
53 # Generic configurable interrupt chip implementation
54 config GENERIC_IRQ_CHIP
58 # Generic irq_domain hw <--> linux irq number translation
62 # Support for hierarchical irq domains
63 config IRQ_DOMAIN_HIERARCHY
67 # Generic IRQ IPI support
68 config GENERIC_IRQ_IPI
71 # Generic MSI interrupt support
72 config GENERIC_MSI_IRQ
75 # Generic MSI hierarchical interrupt domain support
76 config GENERIC_MSI_IRQ_DOMAIN
78 select IRQ_DOMAIN_HIERARCHY
79 select GENERIC_MSI_IRQ
81 config HANDLE_DOMAIN_IRQ
84 config IRQ_DOMAIN_DEBUG
85 bool "Expose hardware/virtual IRQ mapping via debugfs"
86 depends on IRQ_DOMAIN && DEBUG_FS
88 This option will show the mapping relationship between hardware irq
89 numbers and Linux irq numbers. The mapping is exposed via debugfs
90 in the file "irq_domain_mapping".
92 If you don't know what this means you don't need it.
94 # Support forced irq threading
95 config IRQ_FORCED_THREADING
99 bool "Support sparse irq numbering" if MAY_HAVE_SPARSE_IRQ
102 Sparse irq numbering is useful for distro kernels that want
103 to define a high CONFIG_NR_CPUS value but still want to have
104 low kernel memory footprint on smaller machines.
106 ( Sparse irqs can also be beneficial on NUMA boxes, as they spread
107 out the interrupt descriptors in a more NUMA-friendly way. )
109 If you don't know what to do here, say N.