Merge tag 'mm-stable-2023-04-27-15-30' of git://git.kernel.org/pub/scm/linux/kernel...

[linux-block.git] / arch / loongarch / Kconfig

# SPDX-License-Identifier: GPL-2.0
config LOONGARCH
        bool
        default y
        select ACPI
        select ACPI_GENERIC_GSI if ACPI
        select ACPI_MCFG if ACPI
        select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
        select ARCH_BINFMT_ELF_STATE
        select ARCH_ENABLE_MEMORY_HOTPLUG
        select ARCH_ENABLE_MEMORY_HOTREMOVE
        select ARCH_HAS_ACPI_TABLE_UPGRADE      if ACPI
        select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
        select ARCH_HAS_PTE_SPECIAL
        select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
        select ARCH_INLINE_READ_LOCK if !PREEMPTION
        select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
        select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
        select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
        select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
        select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
        select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
        select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
        select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
        select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
        select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION
        select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION
        select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION
        select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION
        select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION
        select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION
        select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION
        select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION
        select ARCH_INLINE_SPIN_LOCK if !PREEMPTION
        select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION
        select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION
        select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION
        select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION
        select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION
        select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION
        select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION
        select ARCH_KEEP_MEMBLOCK
        select ARCH_MIGHT_HAVE_PC_PARPORT
        select ARCH_MIGHT_HAVE_PC_SERIO
        select ARCH_SPARSEMEM_ENABLE
        select ARCH_STACKWALK
        select ARCH_SUPPORTS_ACPI
        select ARCH_SUPPORTS_ATOMIC_RMW
        select ARCH_SUPPORTS_HUGETLBFS
        select ARCH_SUPPORTS_NUMA_BALANCING
        select ARCH_USE_BUILTIN_BSWAP
        select ARCH_USE_CMPXCHG_LOCKREF
        select ARCH_USE_QUEUED_RWLOCKS
        select ARCH_USE_QUEUED_SPINLOCKS
        select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
        select ARCH_WANT_LD_ORPHAN_WARN
        select ARCH_WANT_OPTIMIZE_VMEMMAP
        select ARCH_WANTS_NO_INSTR
        select BUILDTIME_TABLE_SORT
        select COMMON_CLK
        select CPU_PM
        select EFI
        select GENERIC_CLOCKEVENTS
        select GENERIC_CMOS_UPDATE
        select GENERIC_CPU_AUTOPROBE
        select GENERIC_ENTRY
        select GENERIC_GETTIMEOFDAY
        select GENERIC_IOREMAP if !ARCH_IOREMAP
        select GENERIC_IRQ_MULTI_HANDLER
        select GENERIC_IRQ_PROBE
        select GENERIC_IRQ_SHOW
        select GENERIC_LIB_ASHLDI3
        select GENERIC_LIB_ASHRDI3
        select GENERIC_LIB_CMPDI2
        select GENERIC_LIB_LSHRDI3
        select GENERIC_LIB_UCMPDI2
        select GENERIC_LIB_DEVMEM_IS_ALLOWED
        select GENERIC_PCI_IOMAP
        select GENERIC_SCHED_CLOCK
        select GENERIC_SMP_IDLE_THREAD
        select GENERIC_TIME_VSYSCALL
        select GPIOLIB
        select HAS_IOPORT
        select HAVE_ARCH_AUDITSYSCALL
        select HAVE_ARCH_MMAP_RND_BITS if MMU
        select HAVE_ARCH_SECCOMP_FILTER
        select HAVE_ARCH_TRACEHOOK
        select HAVE_ARCH_TRANSPARENT_HUGEPAGE
        select HAVE_ASM_MODVERSIONS
        select HAVE_CONTEXT_TRACKING_USER
        select HAVE_C_RECORDMCOUNT
        select HAVE_DEBUG_STACKOVERFLOW
        select HAVE_DMA_CONTIGUOUS
        select HAVE_DYNAMIC_FTRACE
        select HAVE_DYNAMIC_FTRACE_WITH_ARGS
        select HAVE_DYNAMIC_FTRACE_WITH_REGS
        select HAVE_EBPF_JIT
        select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN
        select HAVE_EXIT_THREAD
        select HAVE_FAST_GUP
        select HAVE_FTRACE_MCOUNT_RECORD
        select HAVE_FUNCTION_ARG_ACCESS_API
        select HAVE_FUNCTION_GRAPH_TRACER
        select HAVE_FUNCTION_TRACER
        select HAVE_GENERIC_VDSO
        select HAVE_HW_BREAKPOINT if PERF_EVENTS
        select HAVE_IOREMAP_PROT
        select HAVE_IRQ_EXIT_ON_IRQ_STACK
        select HAVE_IRQ_TIME_ACCOUNTING
        select HAVE_KPROBES
        select HAVE_KPROBES_ON_FTRACE
        select HAVE_KRETPROBES
        select HAVE_MOD_ARCH_SPECIFIC
        select HAVE_NMI
        select HAVE_PCI
        select HAVE_PERF_EVENTS
        select HAVE_PERF_REGS
        select HAVE_PERF_USER_STACK_DUMP
        select HAVE_REGS_AND_STACK_ACCESS_API
        select HAVE_RSEQ
        select HAVE_SETUP_PER_CPU_AREA if NUMA
        select HAVE_STACKPROTECTOR
        select HAVE_SYSCALL_TRACEPOINTS
        select HAVE_TIF_NOHZ
        select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
        select IRQ_FORCED_THREADING
        select IRQ_LOONGARCH_CPU
        select MMU_GATHER_MERGE_VMAS if MMU
        select MODULES_USE_ELF_RELA if MODULES
        select NEED_PER_CPU_EMBED_FIRST_CHUNK
        select NEED_PER_CPU_PAGE_FIRST_CHUNK
        select OF
        select OF_EARLY_FLATTREE
        select PCI
        select PCI_DOMAINS_GENERIC
        select PCI_ECAM if ACPI
        select PCI_LOONGSON
        select PCI_MSI_ARCH_FALLBACKS
        select PCI_QUIRKS
        select PERF_USE_VMALLOC
        select RTC_LIB
        select SMP
        select SPARSE_IRQ
        select SYSCTL_ARCH_UNALIGN_ALLOW
        select SYSCTL_ARCH_UNALIGN_NO_WARN
        select SYSCTL_EXCEPTION_TRACE
        select SWIOTLB
        select TRACE_IRQFLAGS_SUPPORT
        select USE_PERCPU_NUMA_NODE_ID
        select USER_STACKTRACE_SUPPORT
        select ZONE_DMA32

config 32BIT
        bool

config 64BIT
        def_bool y

config CPU_HAS_FPU
        bool
        default y

config CPU_HAS_PREFETCH
        bool
        default y

config GENERIC_BUG
        def_bool y
        depends on BUG

config GENERIC_BUG_RELATIVE_POINTERS
        def_bool y
        depends on GENERIC_BUG

config GENERIC_CALIBRATE_DELAY
        def_bool y

config GENERIC_CSUM
        def_bool y

config GENERIC_HWEIGHT
        def_bool y

config L1_CACHE_SHIFT
        int
        default "6"

config LOCKDEP_SUPPORT
        bool
        default y

config STACKTRACE_SUPPORT
        bool
        default y

# MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
# MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
# are shared between architectures, and specifically expecting the symbols.
config MACH_LOONGSON32
        def_bool 32BIT

config MACH_LOONGSON64
        def_bool 64BIT

config FIX_EARLYCON_MEM
        def_bool y

config PAGE_SIZE_4KB
        bool

config PAGE_SIZE_16KB
        bool

config PAGE_SIZE_64KB
        bool

config PGTABLE_2LEVEL
        bool

config PGTABLE_3LEVEL
        bool

config PGTABLE_4LEVEL
        bool

config PGTABLE_LEVELS
        int
        default 2 if PGTABLE_2LEVEL
        default 3 if PGTABLE_3LEVEL
        default 4 if PGTABLE_4LEVEL

config SCHED_OMIT_FRAME_POINTER
        bool
        default y

config AS_HAS_EXPLICIT_RELOCS
        def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))

menu "Kernel type and options"

source "kernel/Kconfig.hz"

choice
        prompt "Page Table Layout"
        default 16KB_2LEVEL if 32BIT
        default 16KB_3LEVEL if 64BIT
        help
          Allows choosing the page table layout, which is a combination
          of page size and page table levels. The size of virtual memory
          address space are determined by the page table layout.

config 4KB_3LEVEL
        bool "4KB with 3 levels"
        select PAGE_SIZE_4KB
        select PGTABLE_3LEVEL
        help
          This option selects 4KB page size with 3 level page tables, which
          support a maximum of 39 bits of application virtual memory.

config 4KB_4LEVEL
        bool "4KB with 4 levels"
        select PAGE_SIZE_4KB
        select PGTABLE_4LEVEL
        help
          This option selects 4KB page size with 4 level page tables, which
          support a maximum of 48 bits of application virtual memory.

config 16KB_2LEVEL
        bool "16KB with 2 levels"
        select PAGE_SIZE_16KB
        select PGTABLE_2LEVEL
        help
          This option selects 16KB page size with 2 level page tables, which
          support a maximum of 36 bits of application virtual memory.

config 16KB_3LEVEL
        bool "16KB with 3 levels"
        select PAGE_SIZE_16KB
        select PGTABLE_3LEVEL
        help
          This option selects 16KB page size with 3 level page tables, which
          support a maximum of 47 bits of application virtual memory.

config 64KB_2LEVEL
        bool "64KB with 2 levels"
        select PAGE_SIZE_64KB
        select PGTABLE_2LEVEL
        help
          This option selects 64KB page size with 2 level page tables, which
          support a maximum of 42 bits of application virtual memory.

config 64KB_3LEVEL
        bool "64KB with 3 levels"
        select PAGE_SIZE_64KB
        select PGTABLE_3LEVEL
        help
          This option selects 64KB page size with 3 level page tables, which
          support a maximum of 55 bits of application virtual memory.

endchoice

config CMDLINE
        string "Built-in kernel command line"
        help
          For most platforms, the arguments for the kernel's command line
          are provided at run-time, during boot. However, there are cases
          where either no arguments are being provided or the provided
          arguments are insufficient or even invalid.

          When that occurs, it is possible to define a built-in command
          line here and choose how the kernel should use it later on.

choice
        prompt "Kernel command line type"
        default CMDLINE_BOOTLOADER
        help
          Choose how the kernel will handle the provided built-in command
          line.

config CMDLINE_BOOTLOADER
        bool "Use bootloader kernel arguments if available"
        help
          Prefer the command-line passed by the boot loader if available.
          Use the built-in command line as fallback in case we get nothing
          during boot. This is the default behaviour.

config CMDLINE_EXTEND
        bool "Use built-in to extend bootloader kernel arguments"
        help
          The command-line arguments provided during boot will be
          appended to the built-in command line. This is useful in
          cases where the provided arguments are insufficient and
          you don't want to or cannot modify them.

config CMDLINE_FORCE
        bool "Always use the built-in kernel command string"
        help
          Always use the built-in command line, even if we get one during
          boot. This is useful in case you need to override the provided
          command line on systems where you don't have or want control
          over it.

endchoice

config DMI
        bool "Enable DMI scanning"
        select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
        default y
        help
          This enables SMBIOS/DMI feature for systems, and scanning of
          DMI to identify machine quirks.

config EFI
        bool "EFI runtime service support"
        select UCS2_STRING
        select EFI_RUNTIME_WRAPPERS
        help
          This enables the kernel to use EFI runtime services that are
          available (such as the EFI variable services).

config EFI_STUB
        bool "EFI boot stub support"
        default y
        depends on EFI
        select EFI_GENERIC_STUB
        help
          This kernel feature allows the kernel to be loaded directly by
          EFI firmware without the use of a bootloader.

config SMP
        bool "Multi-Processing support"
        help
          This enables support for systems with more than one CPU. If you have
          a system with only one CPU, say N. If you have a system with more
          than one CPU, say Y.

          If you say N here, the kernel will run on uni- 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,
          uniprocessor machines. On a uniprocessor machine, the kernel
          will run faster if you say N here.

          See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.

          If you don't know what to do here, say N.

config HOTPLUG_CPU
        bool "Support for hot-pluggable CPUs"
        depends on SMP
        select GENERIC_IRQ_MIGRATION
        help
          Say Y here to allow turning CPUs off and on. CPUs can be
          controlled through /sys/devices/system/cpu.
          (Note: power management support will enable this option
            automatically on SMP systems. )
          Say N if you want to disable CPU hotplug.

config NR_CPUS
        int "Maximum number of CPUs (2-256)"
        range 2 256
        depends on SMP
        default "64"
        help
          This allows you to specify the maximum number of CPUs which this
          kernel will support.

config NUMA
        bool "NUMA Support"
        select SMP
        select ACPI_NUMA if ACPI
        help
          Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
          support.  This option improves performance on systems with more
          than one NUMA node; on single node systems it is generally better
          to leave it disabled.

config NODES_SHIFT
        int
        default "6"
        depends on NUMA

config ARCH_FORCE_MAX_ORDER
        int "Maximum zone order"
        default "13" if PAGE_SIZE_64KB
        default "11" if PAGE_SIZE_16KB
        default "10"
        help
          The kernel memory allocator divides physically contiguous memory
          blocks into "zones", where each zone is a power of two number of
          pages.  This option selects the largest power of two that the kernel
          keeps in the memory allocator.  If you need to allocate very large
          blocks of physically contiguous memory, then you may need to
          increase this value.

          The page size is not necessarily 4KB.  Keep this in mind
          when choosing a value for this option.

config ARCH_IOREMAP
        bool "Enable LoongArch DMW-based ioremap()"
        help
          We use generic TLB-based ioremap() by default since it has page
          protection support. However, you can enable LoongArch DMW-based
          ioremap() for better performance.

config ARCH_WRITECOMBINE
        bool "Enable WriteCombine (WUC) for ioremap()"
        help
          LoongArch maintains cache coherency in hardware, but when paired
          with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which
          is similar to WriteCombine) is out of the scope of cache coherency
          machanism for PCIe devices (this is a PCIe protocol violation, which
          may be fixed in newer chipsets).

          This means WUC can only used for write-only memory regions now, so
          this option is disabled by default, making WUC silently fallback to
          SUC for ioremap(). You can enable this option if the kernel is ensured
          to run on hardware without this bug.

          You can override this setting via writecombine=on/off boot parameter.

config ARCH_STRICT_ALIGN
        bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT
        default y
        help
          Not all LoongArch cores support h/w unaligned access, we can use
          -mstrict-align build parameter to prevent unaligned accesses.

          CPUs with h/w unaligned access support:
          Loongson-2K2000/2K3000/3A5000/3C5000/3D5000.

          CPUs without h/w unaligned access support:
          Loongson-2K500/2K1000.

          This option is enabled by default to make the kernel be able to run
          on all LoongArch systems. But you can disable it manually if you want
          to run kernel only on systems with h/w unaligned access support in
          order to optimise for performance.

config KEXEC
        bool "Kexec system call"
        select KEXEC_CORE
        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.

          The name comes from the similarity to the exec system call.

config CRASH_DUMP
        bool "Build kdump crash kernel"
        select RELOCATABLE
        help
          Generate crash dump after being started by kexec. This should
          be normally only set in special crash dump kernels which are
          loaded in the main kernel with kexec-tools into a specially
          reserved region and then later executed after a crash by
          kdump/kexec.

          For more details see Documentation/admin-guide/kdump/kdump.rst

config RELOCATABLE
        bool "Relocatable kernel"
        help
          This builds the kernel as a Position Independent Executable (PIE),
          which retains all relocation metadata required, so as to relocate
          the kernel binary at runtime to a different virtual address from
          its link address.

config RANDOMIZE_BASE
        bool "Randomize the address of the kernel (KASLR)"
        depends on RELOCATABLE
        help
           Randomizes the physical and virtual address at which the
           kernel image is loaded, as a security feature that
           deters exploit attempts relying on knowledge of the location
           of kernel internals.

           The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET.

           If unsure, say N.

config RANDOMIZE_BASE_MAX_OFFSET
        hex "Maximum KASLR offset" if EXPERT
        depends on RANDOMIZE_BASE
        range 0x0 0x10000000
        default "0x01000000"
        help
          When KASLR is active, this provides the maximum offset that will
          be applied to the kernel image. It should be set according to the
          amount of physical RAM available in the target system.

          This is limited by the size of the lower address memory, 256MB.

config SECCOMP
        bool "Enable seccomp to safely compute untrusted bytecode"
        depends on PROC_FS
        default y
        help
          This kernel feature is useful for number crunching applications
          that may need to compute untrusted bytecode during their
          execution. By using pipes or other transports made available to
          the process as file descriptors supporting the read/write
          syscalls, it's possible to isolate those applications in
          their own address space using seccomp. Once seccomp is
          enabled via /proc/<pid>/seccomp, it cannot be disabled
          and the task is only allowed to execute a few safe syscalls
          defined by each seccomp mode.

          If unsure, say Y. Only embedded should say N here.

endmenu

config ARCH_SELECT_MEMORY_MODEL
        def_bool y

config ARCH_FLATMEM_ENABLE
        def_bool y
        depends on !NUMA

config ARCH_SPARSEMEM_ENABLE
        def_bool y
        select SPARSEMEM_VMEMMAP_ENABLE
        help
          Say Y to support efficient handling of sparse physical memory,
          for architectures which are either NUMA (Non-Uniform Memory Access)
          or have huge holes in the physical address space for other reasons.
          See <file:Documentation/mm/numa.rst> for more.

config ARCH_ENABLE_THP_MIGRATION
        def_bool y
        depends on TRANSPARENT_HUGEPAGE

config ARCH_MEMORY_PROBE
        def_bool y
        depends on MEMORY_HOTPLUG

config MMU
        bool
        default y

config ARCH_MMAP_RND_BITS_MIN
        default 12

config ARCH_MMAP_RND_BITS_MAX
        default 18

menu "Power management options"

config ARCH_SUSPEND_POSSIBLE
        def_bool y

config ARCH_HIBERNATION_POSSIBLE
        def_bool y

source "kernel/power/Kconfig"
source "drivers/acpi/Kconfig"

endmenu

source "drivers/firmware/Kconfig"