kernel/irq/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 menu "IRQ subsystem"
   3 # Options selectable by the architecture code
   4
   5 # Make sparse irq Kconfig switch below available
   6 config MAY_HAVE_SPARSE_IRQ
   7        bool
   8
   9 # Legacy support, required for itanic
  10 config GENERIC_IRQ_LEGACY
  11        bool
  12
  13 # Enable the generic irq autoprobe mechanism
  14 config GENERIC_IRQ_PROBE
  15         bool
  16
  17 # Use the generic /proc/interrupts implementation
  18 config GENERIC_IRQ_SHOW
  19        bool
  20
  21 # Print level/edge extra information
  22 config GENERIC_IRQ_SHOW_LEVEL
  23        bool
  24
  25 # Supports effective affinity mask
  26 config GENERIC_IRQ_EFFECTIVE_AFF_MASK
  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 # Interrupt injection mechanism
  42 config GENERIC_IRQ_INJECTION
  43         bool
  44
  45 # Tasklet based software resend for pending interrupts on enable_irq()
  46 config HARDIRQS_SW_RESEND
  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 simulated interrupts
  63 config IRQ_SIM
  64         bool
  65         select IRQ_WORK
  66         select IRQ_DOMAIN
  67
  68 # Support for hierarchical irq domains
  69 config IRQ_DOMAIN_HIERARCHY
  70         bool
  71         select IRQ_DOMAIN
  72
  73 # Support for obsolete non-mapping irq domains
  74 config IRQ_DOMAIN_NOMAP
  75         bool
  76         select IRQ_DOMAIN
  77
  78 # Support for hierarchical fasteoi+edge and fasteoi+level handlers
  79 config IRQ_FASTEOI_HIERARCHY_HANDLERS
  80         bool
  81
  82 # Generic IRQ IPI support
  83 config GENERIC_IRQ_IPI
  84         bool
  85         select IRQ_DOMAIN_HIERARCHY
  86
  87 # Generic MSI interrupt support
  88 config GENERIC_MSI_IRQ
  89         bool
  90
  91 # Generic MSI hierarchical interrupt domain support
  92 config GENERIC_MSI_IRQ_DOMAIN
  93         bool
  94         select IRQ_DOMAIN_HIERARCHY
  95         select GENERIC_MSI_IRQ
  96
  97 config IRQ_MSI_IOMMU
  98         bool
  99
 100 config IRQ_TIMINGS
 101         bool
 102
 103 config GENERIC_IRQ_MATRIX_ALLOCATOR
 104         bool
 105
 106 config GENERIC_IRQ_RESERVATION_MODE
 107         bool
 108
 109 # Support forced irq threading
 110 config IRQ_FORCED_THREADING
 111        bool
 112
 113 config SPARSE_IRQ
 114         bool "Support sparse irq numbering" if MAY_HAVE_SPARSE_IRQ
 115         help
 116
 117           Sparse irq numbering is useful for distro kernels that want
 118           to define a high CONFIG_NR_CPUS value but still want to have
 119           low kernel memory footprint on smaller machines.
 120
 121           ( Sparse irqs can also be beneficial on NUMA boxes, as they spread
 122             out the interrupt descriptors in a more NUMA-friendly way. )
 123
 124           If you don't know what to do here, say N.
 125
 126 config GENERIC_IRQ_DEBUGFS
 127         bool "Expose irq internals in debugfs"
 128         depends on DEBUG_FS
 129         select GENERIC_IRQ_INJECTION
 130         default n
 131         help
 132
 133           Exposes internal state information through debugfs. Mostly for
 134           developers and debugging of hard to diagnose interrupt problems.
 135
 136           If you don't know what to do here, say N.
 137
 138 endmenu
 139
 140 config GENERIC_IRQ_MULTI_HANDLER
 141         bool
 142         help
 143           Allow to specify the low level IRQ handler at run time.
 144
 145 # Cavium Octeon is the last system to use this deprecated option
 146 # Do not even think of enabling this on any new platform
 147 config DEPRECATED_IRQ_CPU_ONOFFLINE
 148         bool
 149         depends on CAVIUM_OCTEON_SOC
 150         default CAVIUM_OCTEON_SOC