| config ARM64 |
| def_bool y |
| select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE |
| select ARCH_USE_CMPXCHG_LOCKREF |
| select ARCH_SUPPORTS_ATOMIC_RMW |
| select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST |
| select ARCH_WANT_OPTIONAL_GPIOLIB |
| select ARCH_WANT_COMPAT_IPC_PARSE_VERSION |
| select ARCH_WANT_FRAME_POINTERS |
| select ARM_AMBA |
| select ARM_ARCH_TIMER |
| select ARM_GIC |
| select BUILDTIME_EXTABLE_SORT |
| select CLONE_BACKWARDS |
| select COMMON_CLK |
| select CPU_PM if (SUSPEND || CPU_IDLE) |
| select DCACHE_WORD_ACCESS |
| select GENERIC_ALLOCATOR |
| select GENERIC_CLOCKEVENTS |
| select GENERIC_CLOCKEVENTS_BROADCAST if SMP |
| select GENERIC_IDLE_POLL_SETUP |
| select GENERIC_IOMAP |
| select GENERIC_IRQ_PROBE |
| select GENERIC_IRQ_SHOW |
| select GENERIC_SCHED_CLOCK |
| select GENERIC_SMP_IDLE_THREAD |
| select GENERIC_STRNCPY_FROM_USER |
| select GENERIC_STRNLEN_USER |
| select GENERIC_TIME_VSYSCALL |
| select HARDIRQS_SW_RESEND |
| select HAVE_ARCH_JUMP_LABEL |
| select HAVE_ARCH_TRACEHOOK |
| select HAVE_DEBUG_BUGVERBOSE |
| select HAVE_DEBUG_KMEMLEAK |
| select HAVE_DMA_API_DEBUG |
| select HAVE_DMA_ATTRS |
| select HAVE_DMA_CONTIGUOUS |
| select HAVE_EFFICIENT_UNALIGNED_ACCESS |
| select HAVE_GENERIC_DMA_COHERENT |
| select HAVE_HW_BREAKPOINT if PERF_EVENTS |
| select HAVE_MEMBLOCK |
| select HAVE_PATA_PLATFORM |
| select HAVE_PERF_EVENTS |
| select IRQ_DOMAIN |
| select MODULES_USE_ELF_RELA |
| select NO_BOOTMEM |
| select OF |
| select OF_EARLY_FLATTREE |
| select PERF_USE_VMALLOC |
| select POWER_RESET |
| select POWER_SUPPLY |
| select RTC_LIB |
| select SPARSE_IRQ |
| select SYSCTL_EXCEPTION_TRACE |
| select CORESIGHT_SUPPORT |
| select CORESIGHT_TRACE_SUPPORT |
| help |
| ARM 64-bit (AArch64) Linux support. |
| |
| config 64BIT |
| def_bool y |
| |
| config ARCH_PHYS_ADDR_T_64BIT |
| def_bool y |
| |
| config MMU |
| def_bool y |
| |
| config NO_IOPORT |
| def_bool y |
| |
| config STACKTRACE_SUPPORT |
| def_bool y |
| |
| config LOCKDEP_SUPPORT |
| def_bool y |
| |
| config TRACE_IRQFLAGS_SUPPORT |
| def_bool y |
| |
| config RWSEM_GENERIC_SPINLOCK |
| def_bool y |
| |
| config GENERIC_HWEIGHT |
| def_bool y |
| |
| config GENERIC_CSUM |
| def_bool y |
| |
| config GENERIC_CALIBRATE_DELAY |
| def_bool y |
| |
| config ZONE_DMA32 |
| def_bool y |
| |
| config ARCH_DMA_ADDR_T_64BIT |
| def_bool y |
| |
| config NEED_DMA_MAP_STATE |
| def_bool y |
| |
| config NEED_SG_DMA_LENGTH |
| def_bool y |
| |
| config SWIOTLB |
| def_bool y |
| |
| config IOMMU_HELPER |
| def_bool SWIOTLB |
| |
| config KERNEL_MODE_NEON |
| def_bool y |
| |
| source "init/Kconfig" |
| |
| source "kernel/Kconfig.freezer" |
| |
| menu "Platform selection" |
| |
| config ARCH_VEXPRESS |
| bool "ARMv8 software model (Versatile Express)" |
| select ARCH_REQUIRE_GPIOLIB |
| select COMMON_CLK_VERSATILE |
| select POWER_RESET_VEXPRESS |
| select VEXPRESS_CONFIG |
| help |
| This enables support for the ARMv8 software model (Versatile |
| Express). |
| |
| config ARCH_XGENE |
| bool "AppliedMicro X-Gene SOC Family" |
| help |
| This enables support for AppliedMicro X-Gene SOC Family |
| |
| config ARCH_MMP |
| bool "Marvell MMP" |
| select ARCH_HAS_OPP |
| select ARCH_HAS_CPUFREQ |
| select ARCH_REQUIRE_GPIOLIB |
| select PINCTRL |
| select PINCTRL_SINGLE |
| select PM_GENERIC_DOMAINS |
| help |
| This enables support for the Marvell MMP platforms. |
| endmenu |
| |
| menu "Bus support" |
| |
| config ARM_AMBA |
| bool |
| |
| endmenu |
| |
| menu "Kernel Features" |
| |
| menu "ARM errata workarounds via the alternatives framework" |
| |
| config ARM64_ERRATUM_826319 |
| bool "Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is accepted" |
| default y |
| help |
| This option adds an alternative code sequence to work around ARM |
| erratum 826319 on Cortex-A53 parts up to r0p2 with an AMBA 4 ACE or |
| AXI master interface and an L2 cache. |
| |
| If a Cortex-A53 uses an AMBA AXI4 ACE interface to other processors |
| and is unable to accept a certain write via this interface, it will |
| not progress on read data presented on the read data channel and the |
| system can deadlock. |
| |
| The workaround promotes data cache clean instructions to |
| data cache clean-and-invalidate. |
| Please note that this does not necessarily enable the workaround, |
| as it depends on the alternative framework, which will only patch |
| the kernel if an affected CPU is detected. |
| |
| If unsure, say Y. |
| |
| config ARM64_ERRATUM_827319 |
| bool "Cortex-A53: 827319: Data cache clean instructions might cause overlapping transactions to the interconnect" |
| default y |
| help |
| This option adds an alternative code sequence to work around ARM |
| erratum 827319 on Cortex-A53 parts up to r0p2 with an AMBA 5 CHI |
| master interface and an L2 cache. |
| |
| Under certain conditions this erratum can cause a clean line eviction |
| to occur at the same time as another transaction to the same address |
| on the AMBA 5 CHI interface, which can cause data corruption if the |
| interconnect reorders the two transactions. |
| |
| The workaround promotes data cache clean instructions to |
| data cache clean-and-invalidate. |
| Please note that this does not necessarily enable the workaround, |
| as it depends on the alternative framework, which will only patch |
| the kernel if an affected CPU is detected. |
| |
| If unsure, say Y. |
| |
| config ARM64_ERRATUM_824069 |
| bool "Cortex-A53: 824069: Cache line might not be marked as clean after a CleanShared snoop" |
| default y |
| help |
| This option adds an alternative code sequence to work around ARM |
| erratum 824069 on Cortex-A53 parts up to r0p2 when it is connected |
| to a coherent interconnect. |
| |
| If a Cortex-A53 processor is executing a store or prefetch for |
| write instruction at the same time as a processor in another |
| cluster is executing a cache maintenance operation to the same |
| address, then this erratum might cause a clean cache line to be |
| incorrectly marked as dirty. |
| |
| The workaround promotes data cache clean instructions to |
| data cache clean-and-invalidate. |
| Please note that this option does not necessarily enable the |
| workaround, as it depends on the alternative framework, which will |
| only patch the kernel if an affected CPU is detected. |
| |
| If unsure, say Y. |
| |
| config ARM64_ERRATUM_845719 |
| bool "Cortex-A53: 845719: a load might read incorrect data" |
| depends on COMPAT |
| default y |
| help |
| This option adds an alternative code sequence to avoid ARM |
| erratum 845719 on Cortex-A53 parts up to r0p4. |
| |
| When running a compat (AArch32) userspace on an affected Cortex-A53 |
| part, a load at EL0 from a virtual address that matches the bottom 32 |
| bits of the virtual address used by a recent load at (AArch64) EL1 |
| might return incorrect data. |
| |
| The fix is to write the contextidr_el1 register on exception |
| return to a 32-bit task. |
| |
| If unsure, say Y. |
| |
| endmenu |
| |
| config ARM64_64K_PAGES |
| bool "Enable 64KB pages support" |
| help |
| This feature enables 64KB pages support (4KB by default) |
| allowing only two levels of page tables and faster TLB |
| look-up. AArch32 emulation is not available when this feature |
| is enabled. |
| |
| config CPU_BIG_ENDIAN |
| bool "Build big-endian kernel" |
| help |
| Say Y if you plan on running a kernel in big-endian mode. |
| |
| config SMP |
| bool "Symmetric Multi-Processing" |
| help |
| This enables support for systems with more than one CPU. If |
| you say N here, the kernel will run on single and |
| multiprocessor machines, but will use only one CPU of a |
| multiprocessor machine. If you say Y here, the kernel will run |
| on many, but not all, single processor machines. On a single |
| processor machine, the kernel will run faster if you say N |
| here. |
| |
| If you don't know what to do here, say N. |
| |
| config SCHED_MC |
| bool "Multi-core scheduler support" |
| depends on SMP |
| help |
| Multi-core scheduler support improves the CPU scheduler's decision |
| making when dealing with multi-core CPU chips at a cost of slightly |
| increased overhead in some places. If unsure say N here. |
| |
| config SCHED_SMT |
| bool "SMT scheduler support" |
| depends on SMP |
| help |
| Improves the CPU scheduler's decision making when dealing with |
| MultiThreading at a cost of slightly increased overhead in some |
| places. If unsure say N here. |
| |
| config DISABLE_CPU_SCHED_DOMAIN_BALANCE |
| bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing" |
| help |
| Disables scheduler load-balancing at CPU sched domain level. |
| |
| config SCHED_HMP |
| bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling" |
| depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP |
| help |
| Experimental scheduler optimizations for heterogeneous platforms. |
| Attempts to introspectively select task affinity to optimize power |
| and performance. Basic support for multiple (>2) cpu types is in place, |
| but it has only been tested with two types of cpus. |
| There is currently no support for migration of task groups, hence |
| !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled |
| between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE). |
| When turned on, this option adds sys/kernel/hmp directory which |
| contains the following files: |
| up_threshold - the load average threshold used for up migration |
| (0 - 1023) |
| down_threshold - the load average threshold used for down migration |
| (0 - 1023) |
| hmp_domains - a list of cpumasks for the present HMP domains, |
| starting with the 'biggest' and ending with the |
| 'smallest'. |
| Note that both the threshold files can be written at runtime to |
| control scheduler behaviour. |
| |
| config SCHED_HMP_PRIO_FILTER |
| bool "(EXPERIMENTAL) Filter HMP migrations by task priority" |
| depends on SCHED_HMP |
| help |
| Enables task priority based HMP migration filter. Any task with |
| a NICE value above the threshold will always be on low-power cpus |
| with less compute capacity. |
| |
| config SCHED_HMP_PRIO_FILTER_VAL |
| int "NICE priority threshold" |
| default 5 |
| depends on SCHED_HMP_PRIO_FILTER |
| |
| config HMP_FAST_CPU_MASK |
| string "HMP scheduler fast CPU mask" |
| depends on SCHED_HMP |
| help |
| Leave empty to use device tree information. |
| Specify the cpuids of the fast CPUs in the system as a list string, |
| e.g. cpuid 0+1 should be specified as 0-1. |
| |
| config HMP_SLOW_CPU_MASK |
| string "HMP scheduler slow CPU mask" |
| depends on SCHED_HMP |
| help |
| Leave empty to use device tree information. |
| Specify the cpuids of the slow CPUs in the system as a list string, |
| e.g. cpuid 0+1 should be specified as 0-1. |
| |
| config HMP_VARIABLE_SCALE |
| bool "Allows changing the load tracking scale through sysfs" |
| depends on SCHED_HMP |
| help |
| When turned on, this option exports the load average period value |
| for the load tracking patches through sysfs. |
| The values can be modified to change the rate of load accumulation |
| used for HMP migration. 'load_avg_period_ms' is the time in ms to |
| reach a load average of 0.5 for an idle task of 0 load average |
| ratio which becomes 100% busy. |
| For example, with load_avg_period_ms = 128 and up_threshold = 512, |
| a running task with a load of 0 will be migrated to a bigger CPU after |
| 128ms, because after 128ms its load_avg_ratio is 0.5 and the real |
| up_threshold is 0.5. |
| This patch has the same behavior as changing the Y of the load |
| average computation to |
| (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms) |
| but removes intermediate overflows in computation. |
| |
| config HMP_FREQUENCY_INVARIANT_SCALE |
| bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP" |
| depends on SCHED_HMP && CPU_FREQ |
| help |
| Scales the current load contribution in line with the frequency |
| of the CPU that the task was executed on. |
| In this version, we use a simple linear scale derived from the |
| maximum frequency reported by CPUFreq. |
| Restricting tracked load to be scaled by the CPU's frequency |
| represents the consumption of possible compute capacity |
| (rather than consumption of actual instantaneous capacity as |
| normal) and allows the HMP migration's simple threshold |
| migration strategy to interact more predictably with CPUFreq's |
| asynchronous compute capacity changes. |
| |
| config SCHED_HMP_LITTLE_PACKING |
| bool "Small task packing for HMP" |
| depends on SCHED_HMP |
| default n |
| help |
| Allows the HMP Scheduler to pack small tasks into CPUs in the |
| smallest HMP domain. |
| Controlled by two sysfs files in sys/kernel/hmp. |
| packing_enable: 1 to enable, 0 to disable packing. Default 1. |
| packing_limit: runqueue load ratio where a RQ is considered |
| to be full. Default is NICE_0_LOAD * 9/8. |
| |
| |
| config NR_CPUS |
| int "Maximum number of CPUs (2-32)" |
| range 2 32 |
| depends on SMP |
| # These have to remain sorted largest to smallest |
| default "8" |
| |
| config HOTPLUG_CPU |
| bool "Support for hot-pluggable CPUs" |
| depends on SMP |
| help |
| Say Y here to experiment with turning CPUs off and on. CPUs |
| can be controlled through /sys/devices/system/cpu. |
| |
| source kernel/Kconfig.preempt |
| |
| config HZ |
| int |
| default 100 |
| |
| config ARCH_HAS_HOLES_MEMORYMODEL |
| def_bool y if SPARSEMEM |
| |
| config ARCH_SPARSEMEM_ENABLE |
| bool |
| |
| config SPARSEMEM_VMEMMAP_ENABLE |
| def_bool ARCH_SPARSEMEM_ENABLE |
| |
| config ARCH_SPARSEMEM_DEFAULT |
| def_bool ARCH_SPARSEMEM_ENABLE |
| |
| config ARCH_SELECT_MEMORY_MODEL |
| def_bool ARCH_SPARSEMEM_ENABLE |
| |
| config HAVE_ARCH_PFN_VALID |
| def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM |
| |
| config HW_PERF_EVENTS |
| bool "Enable hardware performance counter support for perf events" |
| depends on PERF_EVENTS |
| default y |
| help |
| Enable hardware performance counter support for perf events. If |
| disabled, perf events will use software events only. |
| |
| config SYS_SUPPORTS_HUGETLBFS |
| def_bool y |
| |
| config ARCH_WANT_GENERAL_HUGETLB |
| def_bool y |
| |
| config ARCH_WANT_HUGE_PMD_SHARE |
| def_bool y if !ARM64_64K_PAGES |
| |
| config HAVE_ARCH_TRANSPARENT_HUGEPAGE |
| def_bool y |
| |
| source "mm/Kconfig" |
| |
| config KEXEC |
| bool "kexec system call" |
| ---help--- |
| kexec is a system call that implements the ability to shutdown your |
| current kernel, and to start another kernel. It is like a reboot |
| but it is independent of the system firmware. And like a reboot |
| you can start any kernel with it, not just Linux. |
| |
| config XEN_DOM0 |
| def_bool y |
| depends on XEN |
| |
| config XEN |
| bool "Xen guest support on ARM64 (EXPERIMENTAL)" |
| depends on ARM64 && OF |
| select SWIOTLB_XEN |
| help |
| Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64. |
| |
| config FORCE_MAX_ZONEORDER |
| int |
| default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE) |
| default "11" |
| |
| config ARM64_FLUSH_CONSOLE_ON_RESTART |
| bool "Force flush the console on restart" |
| help |
| If the console is locked while the system is rebooted, the messages |
| in the temporary logbuffer would not have propogated to all the |
| console drivers. This option forces the console lock to be |
| released if it failed to be acquired, which will cause all the |
| pending messages to be flushed. |
| |
| endmenu |
| |
| menu "Boot options" |
| |
| config CMDLINE |
| string "Default kernel command string" |
| default "" |
| help |
| Provide a set of default command-line options at build time by |
| entering them here. As a minimum, you should specify the the |
| root device (e.g. root=/dev/nfs). |
| |
| choice |
| prompt "Kernel command line type" if CMDLINE != "" |
| default CMDLINE_FROM_BOOTLOADER |
| |
| config CMDLINE_FROM_BOOTLOADER |
| bool "Use bootloader kernel arguments if available" |
| help |
| Uses the command-line options passed by the boot loader. If |
| the boot loader doesn't provide any, the default kernel command |
| string provided in CMDLINE will be used. |
| |
| config CMDLINE_EXTEND |
| bool "Extend bootloader kernel arguments" |
| help |
| The command-line arguments provided by the boot loader will be |
| appended to the default kernel command string. |
| |
| config CMDLINE_FORCE |
| bool "Always use the default kernel command string" |
| help |
| Always use the default kernel command string, even if the boot |
| loader passes other arguments to the kernel. |
| This is useful if you cannot or don't want to change the |
| command-line options your boot loader passes to the kernel. |
| endchoice |
| |
| config BUILD_ARM64_APPENDED_DTB_IMAGE |
| bool "Build a concatenated Image.gz/dtb by default" |
| depends on OF |
| help |
| Enabling this option will cause a concatenated Image.gz and list of |
| DTBs to be built by default (instead of a standalone Image.gz.) |
| The image will built in arch/arm64/boot/Image.gz-dtb |
| |
| config BUILD_ARM64_APPENDED_DTB_IMAGE_NAMES |
| string "Default dtb names" |
| depends on BUILD_ARM64_APPENDED_DTB_IMAGE |
| help |
| Space separated list of names of dtbs to append when |
| building a concatenated Image.gz-dtb. |
| |
| endmenu |
| |
| menu "Userspace binary formats" |
| |
| source "fs/Kconfig.binfmt" |
| |
| config COMPAT |
| bool "Kernel support for 32-bit EL0" |
| depends on !ARM64_64K_PAGES |
| select COMPAT_BINFMT_ELF |
| select HAVE_UID16 |
| select OLD_SIGSUSPEND3 |
| select COMPAT_OLD_SIGACTION |
| help |
| This option enables support for a 32-bit EL0 running under a 64-bit |
| kernel at EL1. AArch32-specific components such as system calls, |
| the user helper functions, VFP support and the ptrace interface are |
| handled appropriately by the kernel. |
| |
| If you want to execute 32-bit userspace applications, say Y. |
| |
| config SYSVIPC_COMPAT |
| def_bool y |
| depends on COMPAT && SYSVIPC |
| |
| endmenu |
| |
| menu "Power management options" |
| |
| source "kernel/power/Kconfig" |
| |
| config ARCH_SUSPEND_POSSIBLE |
| def_bool y |
| |
| config ARM64_CPU_SUSPEND |
| def_bool PM_SLEEP |
| |
| endmenu |
| |
| menu "CPU Power Management" |
| |
| source "drivers/cpufreq/Kconfig" |
| source "drivers/cpuidle/Kconfig" |
| |
| source "drivers/cpuhotplug/Kconfig" |
| |
| endmenu |
| |
| source "net/Kconfig" |
| |
| source "drivers/Kconfig" |
| |
| source "fs/Kconfig" |
| |
| source "arch/arm64/kvm/Kconfig" |
| |
| source "arch/arm64/Kconfig.debug" |
| |
| source "security/Kconfig" |
| |
| source "crypto/Kconfig" |
| if CRYPTO |
| source "arch/arm64/crypto/Kconfig" |
| endif |
| |
| source "lib/Kconfig" |