LXR linux/kernel/irq/Kconfig

   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# Support for generic irq migrating off cpu before the cpu is offline.
  34config GENERIC_IRQ_MIGRATION
  35        bool
  36
  37# Alpha specific irq affinity mechanism
  38config AUTO_IRQ_AFFINITY
  39       bool
  40
  41# Tasklet based software resend for pending interrupts on enable_irq()
  42config HARDIRQS_SW_RESEND
  43       bool
  44
  45# Preflow handler support for fasteoi (sparc64)
  46config IRQ_PREFLOW_FASTEOI
  47       bool
  48
  49# Edge style eoi based handler (cell)
  50config IRQ_EDGE_EOI_HANDLER
  51       bool
  52
  53# Generic configurable interrupt chip implementation
  54config GENERIC_IRQ_CHIP
  55       bool
  56       select IRQ_DOMAIN
  57
  58# Generic irq_domain hw <--> linux irq number translation
  59config IRQ_DOMAIN
  60        bool
  61
  62# Support for hierarchical irq domains
  63config IRQ_DOMAIN_HIERARCHY
  64        bool
  65        select IRQ_DOMAIN
  66
  67# Generic IRQ IPI support
  68config GENERIC_IRQ_IPI
  69        bool
  70
  71# Generic MSI interrupt support
  72config GENERIC_MSI_IRQ
  73        bool
  74
  75# Generic MSI hierarchical interrupt domain support
  76config GENERIC_MSI_IRQ_DOMAIN
  77        bool
  78        select IRQ_DOMAIN_HIERARCHY
  79        select GENERIC_MSI_IRQ
  80
  81config HANDLE_DOMAIN_IRQ
  82        bool
  83
  84config 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
  95config IRQ_FORCED_THREADING
  96       bool
  97
  98config SPARSE_IRQ
  99        bool "Support sparse irq numbering" if MAY_HAVE_SPARSE_IRQ
 100        ---help---
 101
 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.
 105
 106          ( Sparse irqs can also be beneficial on NUMA boxes, as they spread
 107            out the interrupt descriptors in a more NUMA-friendly way. )
 108
 109          If you don't know what to do here, say N.
 110
 111endmenu
 112