1# SPDX-License-Identifier: GPL-2.0-only 2menu "IRQ subsystem" 3# Options selectable by the architecture code 4 5# Make sparse irq Kconfig switch below available 6config MAY_HAVE_SPARSE_IRQ 7 bool 8 9# Legacy support, required for itanic 10config GENERIC_IRQ_LEGACY 11 bool 12 13# Enable the generic irq autoprobe mechanism 14config GENERIC_IRQ_PROBE 15 bool 16 17# Use the generic /proc/interrupts implementation 18config GENERIC_IRQ_SHOW 19 bool 20 21# Print level/edge extra information 22config GENERIC_IRQ_SHOW_LEVEL 23 bool 24 25# Supports effective affinity mask 26config GENERIC_IRQ_EFFECTIVE_AFF_MASK 27 depends on SMP 28 bool 29 30# Support for delayed migration from interrupt context 31config GENERIC_PENDING_IRQ 32 bool 33 34# Support for generic irq migrating off cpu before the cpu is offline. 35config GENERIC_IRQ_MIGRATION 36 bool 37 38# Alpha specific irq affinity mechanism 39config AUTO_IRQ_AFFINITY 40 bool 41 42# Interrupt injection mechanism 43config GENERIC_IRQ_INJECTION 44 bool 45 46# Tasklet based software resend for pending interrupts on enable_irq() 47config HARDIRQS_SW_RESEND 48 bool 49 50# Edge style eoi based handler (cell) 51config IRQ_EDGE_EOI_HANDLER 52 bool 53 54# Generic configurable interrupt chip implementation 55config GENERIC_IRQ_CHIP 56 bool 57 select IRQ_DOMAIN 58 59# Generic irq_domain hw <--> linux irq number translation 60config IRQ_DOMAIN 61 bool 62 63# Support for simulated interrupts 64config IRQ_SIM 65 bool 66 select IRQ_WORK 67 select IRQ_DOMAIN 68 69# Support for hierarchical irq domains 70config IRQ_DOMAIN_HIERARCHY 71 bool 72 select IRQ_DOMAIN 73 74# Support for obsolete non-mapping irq domains 75config IRQ_DOMAIN_NOMAP 76 bool 77 select IRQ_DOMAIN 78 79# Support for hierarchical fasteoi+edge and fasteoi+level handlers 80config IRQ_FASTEOI_HIERARCHY_HANDLERS 81 bool 82 83# Generic IRQ IPI support 84config GENERIC_IRQ_IPI 85 bool 86 depends on SMP 87 select IRQ_DOMAIN_HIERARCHY 88 89# Generic MSI hierarchical interrupt domain support 90config GENERIC_MSI_IRQ 91 bool 92 select IRQ_DOMAIN_HIERARCHY 93 94config IRQ_MSI_IOMMU 95 bool 96 97config IRQ_TIMINGS 98 bool 99 100config GENERIC_IRQ_MATRIX_ALLOCATOR 101 bool 102 103config GENERIC_IRQ_RESERVATION_MODE 104 bool 105 106# Support forced irq threading 107config IRQ_FORCED_THREADING 108 bool 109 110config SPARSE_IRQ 111 bool "Support sparse irq numbering" if MAY_HAVE_SPARSE_IRQ 112 help 113 114 Sparse irq numbering is useful for distro kernels that want 115 to define a high CONFIG_NR_CPUS value but still want to have 116 low kernel memory footprint on smaller machines. 117 118 ( Sparse irqs can also be beneficial on NUMA boxes, as they spread 119 out the interrupt descriptors in a more NUMA-friendly way. ) 120 121 If you don't know what to do here, say N. 122 123config GENERIC_IRQ_DEBUGFS 124 bool "Expose irq internals in debugfs" 125 depends on DEBUG_FS 126 select GENERIC_IRQ_INJECTION 127 default n 128 help 129 130 Exposes internal state information through debugfs. Mostly for 131 developers and debugging of hard to diagnose interrupt problems. 132 133 If you don't know what to do here, say N. 134 135endmenu 136 137config GENERIC_IRQ_MULTI_HANDLER 138 bool 139 help 140 Allow to specify the low level IRQ handler at run time. 141 142# Cavium Octeon is the last system to use this deprecated option 143# Do not even think of enabling this on any new platform 144config DEPRECATED_IRQ_CPU_ONOFFLINE 145 bool 146 depends on CAVIUM_OCTEON_SOC 147 default CAVIUM_OCTEON_SOC 148