1d9817ebeSThomas Gleixnermenu "IRQ subsystem" 2d9817ebeSThomas Gleixner# Options selectable by the architecture code 3c68fd4f3SThomas Gleixner 4c68fd4f3SThomas Gleixner# Make sparse irq Kconfig switch below available 52ed86b16SRob Herringconfig MAY_HAVE_SPARSE_IRQ 6fd4afaf3SJan Beulich bool 7d9817ebeSThomas Gleixner 8*c940e01cSThomas Gleixner# Legacy support, required for itanic 9*c940e01cSThomas Gleixnerconfig GENERIC_IRQ_LEGACY 10*c940e01cSThomas Gleixner bool 11*c940e01cSThomas Gleixner 12c68fd4f3SThomas Gleixner# Enable the generic irq autoprobe mechanism 13d9817ebeSThomas Gleixnerconfig GENERIC_IRQ_PROBE 14fd4afaf3SJan Beulich bool 15d9817ebeSThomas Gleixner 16c68fd4f3SThomas Gleixner# Use the generic /proc/interrupts implementation 17c78b9b65SThomas Gleixnerconfig GENERIC_IRQ_SHOW 18fd4afaf3SJan Beulich bool 19c78b9b65SThomas Gleixner 20ab7798ffSThomas Gleixner# Print level/edge extra information 21ab7798ffSThomas Gleixnerconfig GENERIC_IRQ_SHOW_LEVEL 22ab7798ffSThomas Gleixner bool 23ab7798ffSThomas Gleixner 247b6ef126SThomas Gleixner# Facility to allocate a hardware interrupt. This is legacy support 257b6ef126SThomas Gleixner# and should not be used in new code. Use irq domains instead. 267b6ef126SThomas Gleixnerconfig GENERIC_IRQ_LEGACY_ALLOC_HWIRQ 277b6ef126SThomas Gleixner bool 287b6ef126SThomas Gleixner 29c68fd4f3SThomas Gleixner# Support for delayed migration from interrupt context 30d9817ebeSThomas Gleixnerconfig GENERIC_PENDING_IRQ 31fd4afaf3SJan Beulich bool 32d9817ebeSThomas Gleixner 33c68fd4f3SThomas Gleixner# Alpha specific irq affinity mechanism 34d9817ebeSThomas Gleixnerconfig AUTO_IRQ_AFFINITY 35fd4afaf3SJan Beulich bool 36d9817ebeSThomas Gleixner 37c68fd4f3SThomas Gleixner# Tasklet based software resend for pending interrupts on enable_irq() 38d9817ebeSThomas Gleixnerconfig HARDIRQS_SW_RESEND 39fd4afaf3SJan Beulich bool 40d9817ebeSThomas Gleixner 41c68fd4f3SThomas Gleixner# Preflow handler support for fasteoi (sparc64) 4278129576SThomas Gleixnerconfig IRQ_PREFLOW_FASTEOI 43fd4afaf3SJan Beulich bool 4478129576SThomas Gleixner 450521c8fbSThomas Gleixner# Edge style eoi based handler (cell) 460521c8fbSThomas Gleixnerconfig IRQ_EDGE_EOI_HANDLER 470521c8fbSThomas Gleixner bool 480521c8fbSThomas Gleixner 49c42321c7SThomas Gleixner# Generic configurable interrupt chip implementation 50c42321c7SThomas Gleixnerconfig GENERIC_IRQ_CHIP 51c42321c7SThomas Gleixner bool 52923fa4eaSNitin A Kamble select IRQ_DOMAIN 53c42321c7SThomas Gleixner 5408a543adSGrant Likely# Generic irq_domain hw <--> linux irq number translation 5508a543adSGrant Likelyconfig IRQ_DOMAIN 5608a543adSGrant Likely bool 5708a543adSGrant Likely 58092b2fb0SGrant Likelyconfig IRQ_DOMAIN_DEBUG 59092b2fb0SGrant Likely bool "Expose hardware/virtual IRQ mapping via debugfs" 60092b2fb0SGrant Likely depends on IRQ_DOMAIN && DEBUG_FS 61092b2fb0SGrant Likely help 62092b2fb0SGrant Likely This option will show the mapping relationship between hardware irq 63092b2fb0SGrant Likely numbers and Linux irq numbers. The mapping is exposed via debugfs 64ac5830a3SMika Westerberg in the file "irq_domain_mapping". 65092b2fb0SGrant Likely 66092b2fb0SGrant Likely If you don't know what this means you don't need it. 67092b2fb0SGrant Likely 68c68fd4f3SThomas Gleixner# Support forced irq threading 698d32a307SThomas Gleixnerconfig IRQ_FORCED_THREADING 708d32a307SThomas Gleixner bool 718d32a307SThomas Gleixner 72d9817ebeSThomas Gleixnerconfig SPARSE_IRQ 732ed86b16SRob Herring bool "Support sparse irq numbering" if MAY_HAVE_SPARSE_IRQ 74d9817ebeSThomas Gleixner ---help--- 75d9817ebeSThomas Gleixner 76d9817ebeSThomas Gleixner Sparse irq numbering is useful for distro kernels that want 77d9817ebeSThomas Gleixner to define a high CONFIG_NR_CPUS value but still want to have 78d9817ebeSThomas Gleixner low kernel memory footprint on smaller machines. 79d9817ebeSThomas Gleixner 80d9817ebeSThomas Gleixner ( Sparse irqs can also be beneficial on NUMA boxes, as they spread 81d9817ebeSThomas Gleixner out the interrupt descriptors in a more NUMA-friendly way. ) 82d9817ebeSThomas Gleixner 83d9817ebeSThomas Gleixner If you don't know what to do here, say N. 84d9817ebeSThomas Gleixner 85d9817ebeSThomas Gleixnerendmenu 86