kernel/irq/Kconfig

   1 menu "IRQ subsystem"
   2 # Options selectable by the architecture code
   3
   4 # Make sparse irq Kconfig switch below available
   5 config MAY_HAVE_SPARSE_IRQ
   6        bool
   7
   8 # Legacy support, required for itanic
   9 config GENERIC_IRQ_LEGACY
  10        bool
  11
  12 # Enable the generic irq autoprobe mechanism
  13 config GENERIC_IRQ_PROBE
  14         bool
  15
  16 # Use the generic /proc/interrupts implementation
  17 config GENERIC_IRQ_SHOW
  18        bool
  19
  20 # Print level/edge extra information
  21 config 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.
  26 config GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
  27        bool
  28
  29 # Support for delayed migration from interrupt context
  30 config GENERIC_PENDING_IRQ
  31         bool
  32
  33 # Support for generic irq migrating off cpu before the cpu is offline.
  34 config GENERIC_IRQ_MIGRATION
  35         bool
  36
  37 # Alpha specific irq affinity mechanism
  38 config AUTO_IRQ_AFFINITY
  39        bool
  40
  41 # Tasklet based software resend for pending interrupts on enable_irq()
  42 config HARDIRQS_SW_RESEND
  43        bool
  44
  45 # Preflow handler support for fasteoi (sparc64)
  46 config IRQ_PREFLOW_FASTEOI
  47        bool
  48
  49 # Edge style eoi based handler (cell)
  50 config IRQ_EDGE_EOI_HANDLER
  51        bool
  52
  53 # Generic configurable interrupt chip implementation
  54 config GENERIC_IRQ_CHIP
  55        bool
  56        select IRQ_DOMAIN
  57
  58 # Generic irq_domain hw <--> linux irq number translation
  59 config IRQ_DOMAIN
  60         bool
  61
  62 # Support for hierarchical irq domains
  63 config IRQ_DOMAIN_HIERARCHY
  64         bool
  65         select IRQ_DOMAIN
  66
  67 # Generic IRQ IPI support
  68 config GENERIC_IRQ_IPI
  69         bool
  70
  71 # Generic MSI interrupt support
  72 config GENERIC_MSI_IRQ
  73         bool
  74
  75 # Generic MSI hierarchical interrupt domain support
  76 config GENERIC_MSI_IRQ_DOMAIN
  77         bool
  78         select IRQ_DOMAIN_HIERARCHY
  79         select GENERIC_MSI_IRQ
  80
  81 config HANDLE_DOMAIN_IRQ
  82         bool
  83
  84 config IRQ_DOMAIN_DEBUG
  85         bool "Expose hardware/virtual IRQ mapping via debugfs"
  86         depends on IRQ_DOMAIN && DEBUG_FS
  87         help
  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".
  91
  92           If you don't know what this means you don't need it.
  93
  94 # Support forced irq threading
  95 config IRQ_FORCED_THREADING
  96        bool
  97
  98 config IRQ_FORCED_THREADING_DEFAULT
  99         bool "Use IRQ threading by default"
 100         depends on IRQ_FORCED_THREADING
 101
 102 config SPARSE_IRQ
 103         bool "Support sparse irq numbering" if MAY_HAVE_SPARSE_IRQ
 104         ---help---
 105
 106           Sparse irq numbering is useful for distro kernels that want
 107           to define a high CONFIG_NR_CPUS value but still want to have
 108           low kernel memory footprint on smaller machines.
 109
 110           ( Sparse irqs can also be beneficial on NUMA boxes, as they spread
 111             out the interrupt descriptors in a more NUMA-friendly way. )
 112
 113           If you don't know what to do here, say N.
 114
 115 endmenu