diff options
Diffstat (limited to 'arch/riscv/Kconfig')
| -rw-r--r-- | arch/riscv/Kconfig | 418 |
1 files changed, 356 insertions, 62 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index be09c8836d56..1c5544401530 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -13,26 +13,40 @@ config 32BIT config RISCV def_bool y select ACPI_GENERIC_GSI if ACPI + select ACPI_MCFG if (ACPI && PCI) + select ACPI_PPTT if ACPI select ACPI_REDUCED_HARDWARE_ONLY if ACPI + select ACPI_SPCR_TABLE if ACPI select ARCH_DMA_DEFAULT_COHERENT select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION + select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM_VMEMMAP + select ARCH_ENABLE_MEMORY_HOTREMOVE if MEMORY_HOTPLUG select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2 select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE select ARCH_HAS_BINFMT_FLAT + select ARCH_HAS_CRC32 if RISCV_ISA_ZBC + select ARCH_HAS_CRC64 if 64BIT && RISCV_ISA_ZBC + select ARCH_HAS_CRC_T10DIF if RISCV_ISA_ZBC select ARCH_HAS_CURRENT_STACK_POINTER select ARCH_HAS_DEBUG_VIRTUAL if MMU select ARCH_HAS_DEBUG_VM_PGTABLE select ARCH_HAS_DEBUG_WX + select ARCH_HAS_FAST_MULTIPLIER select ARCH_HAS_FORTIFY_SOURCE select ARCH_HAS_GCOV_PROFILE_ALL select ARCH_HAS_GIGANTIC_PAGE + select ARCH_HAS_HW_PTE_YOUNG select ARCH_HAS_KCOV + select ARCH_HAS_KERNEL_FPU_SUPPORT if 64BIT && FPU select ARCH_HAS_MEMBARRIER_CALLBACKS select ARCH_HAS_MEMBARRIER_SYNC_CORE select ARCH_HAS_MMIOWB select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE select ARCH_HAS_PMEM_API + select ARCH_HAS_PREEMPT_LAZY select ARCH_HAS_PREPARE_SYNC_CORE_CMD + select ARCH_HAS_PTDUMP if MMU + select ARCH_HAS_PTE_DEVMAP if 64BIT && MMU select ARCH_HAS_PTE_SPECIAL select ARCH_HAS_SET_DIRECT_MAP if MMU select ARCH_HAS_SET_MEMORY if MMU @@ -42,46 +56,58 @@ config RISCV select ARCH_HAS_SYSCALL_WRAPPER select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_HAS_UBSAN - select ARCH_HAS_VDSO_DATA + select ARCH_HAS_VDSO_ARCH_DATA if GENERIC_VDSO_DATA_STORE select ARCH_KEEP_MEMBLOCK if ACPI + select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE if 64BIT && MMU select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT select ARCH_STACKWALK select ARCH_SUPPORTS_ATOMIC_RMW - select ARCH_SUPPORTS_CFI_CLANG + # clang >= 17: https://github.com/llvm/llvm-project/commit/62fa708ceb027713b386c7e0efda994f8bdc27e2 + select ARCH_SUPPORTS_CFI_CLANG if CLANG_VERSION >= 170000 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if MMU + select ARCH_SUPPORTS_HUGE_PFNMAP if TRANSPARENT_HUGEPAGE select ARCH_SUPPORTS_HUGETLBFS if MMU # LLD >= 14: https://github.com/llvm/llvm-project/issues/50505 select ARCH_SUPPORTS_LTO_CLANG if LLD_VERSION >= 140000 select ARCH_SUPPORTS_LTO_CLANG_THIN if LLD_VERSION >= 140000 + select ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS if 64BIT && MMU select ARCH_SUPPORTS_PAGE_TABLE_CHECK if MMU select ARCH_SUPPORTS_PER_VMA_LOCK if MMU + select ARCH_SUPPORTS_RT select ARCH_SUPPORTS_SHADOW_CALL_STACK if HAVE_SHADOW_CALL_STACK + select ARCH_USE_CMPXCHG_LOCKREF if 64BIT select ARCH_USE_MEMTEST select ARCH_USE_QUEUED_RWLOCKS + select ARCH_USE_SYM_ANNOTATIONS select ARCH_USES_CFI_TRAPS if CFI_CLANG - select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH if SMP && MMU + select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH if MMU select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU select ARCH_WANT_FRAME_POINTERS select ARCH_WANT_GENERAL_HUGETLB if !RISCV_ISA_SVNAPOT select ARCH_WANT_HUGE_PMD_SHARE if 64BIT select ARCH_WANT_LD_ORPHAN_WARN if !XIP_KERNEL + select ARCH_WANT_OPTIMIZE_DAX_VMEMMAP select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP select ARCH_WANTS_NO_INSTR select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE + select ARCH_WEAK_RELEASE_ACQUIRE if ARCH_USE_QUEUED_SPINLOCKS select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU select BUILDTIME_TABLE_SORT if MMU - select CLINT_TIMER if !MMU + select CLINT_TIMER if RISCV_M_MODE select CLONE_BACKWARDS select COMMON_CLK select CPU_PM if CPU_IDLE || HIBERNATION || SUSPEND + select DYNAMIC_FTRACE if FUNCTION_TRACER select EDAC_SUPPORT select FRAME_POINTER if PERF_EVENTS || (FUNCTION_TRACER && !DYNAMIC_FTRACE) select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY if DYNAMIC_FTRACE + select FUNCTION_ALIGNMENT_8B if DYNAMIC_FTRACE_WITH_CALL_OPS select GENERIC_ARCH_TOPOLOGY select GENERIC_ATOMIC64 if !64BIT select GENERIC_CLOCKEVENTS_BROADCAST if SMP select GENERIC_CPU_DEVICES + select GENERIC_CPU_VULNERABILITIES select GENERIC_EARLY_IOREMAP select GENERIC_ENTRY select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO @@ -93,17 +119,19 @@ config RISCV select GENERIC_IRQ_SHOW select GENERIC_IRQ_SHOW_LEVEL select GENERIC_LIB_DEVMEM_IS_ALLOWED + select GENERIC_PENDING_IRQ if SMP select GENERIC_PCI_IOMAP - select GENERIC_PTDUMP if MMU select GENERIC_SCHED_CLOCK select GENERIC_SMP_IDLE_THREAD select GENERIC_TIME_VSYSCALL if MMU && 64BIT + select GENERIC_VDSO_DATA_STORE if MMU select GENERIC_VDSO_TIME_NS if HAVE_GENERIC_VDSO select HARDIRQS_SW_RESEND select HAS_IOPORT if MMU + select HAVE_ALIGNED_STRUCT_PAGE select HAVE_ARCH_AUDITSYSCALL select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP - select HAVE_ARCH_HUGE_VMAP if MMU && 64BIT && !XIP_KERNEL + select HAVE_ARCH_HUGE_VMAP if MMU && 64BIT select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL select HAVE_ARCH_JUMP_LABEL_RELATIVE if !XIP_KERNEL select HAVE_ARCH_KASAN if MMU && 64BIT @@ -115,9 +143,11 @@ config RISCV select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET select HAVE_ARCH_SECCOMP_FILTER + select HAVE_ARCH_STACKLEAK select HAVE_ARCH_THREAD_STRUCT_WHITELIST select HAVE_ARCH_TRACEHOOK select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT && MMU + select HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD if 64BIT && MMU select HAVE_ARCH_USERFAULTFD_MINOR if 64BIT && USERFAULTFD select HAVE_ARCH_VMAP_STACK if MMU && 64BIT select HAVE_ASM_MODVERSIONS @@ -125,21 +155,31 @@ config RISCV select HAVE_DEBUG_KMEMLEAK select HAVE_DMA_CONTIGUOUS if MMU select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && MMU && (CLANG_SUPPORTS_DYNAMIC_FTRACE || GCC_SUPPORTS_DYNAMIC_FTRACE) - select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS - select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE + select FUNCTION_ALIGNMENT_4B if HAVE_DYNAMIC_FTRACE && RISCV_ISA_C + select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS if HAVE_DYNAMIC_FTRACE_WITH_CALL_OPS + select HAVE_DYNAMIC_FTRACE_WITH_CALL_OPS if (DYNAMIC_FTRACE_WITH_ARGS && !CFI_CLANG) + select HAVE_DYNAMIC_FTRACE_WITH_ARGS if HAVE_DYNAMIC_FTRACE + select HAVE_FTRACE_GRAPH_FUNC select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL - select HAVE_FUNCTION_GRAPH_TRACER - select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER - select HAVE_FUNCTION_TRACER if !XIP_KERNEL && !PREEMPTION + select HAVE_FUNCTION_GRAPH_TRACER if HAVE_DYNAMIC_FTRACE_WITH_ARGS + select HAVE_FUNCTION_GRAPH_FREGS + select HAVE_FUNCTION_TRACER if !XIP_KERNEL && HAVE_DYNAMIC_FTRACE select HAVE_EBPF_JIT if MMU - select HAVE_FAST_GUP if MMU + select HAVE_GUP_FAST if MMU select HAVE_FUNCTION_ARG_ACCESS_API select HAVE_FUNCTION_ERROR_INJECTION select HAVE_GCC_PLUGINS select HAVE_GENERIC_VDSO if MMU && 64BIT select HAVE_IRQ_TIME_ACCOUNTING + select HAVE_KERNEL_BZIP2 if !XIP_KERNEL && !EFI_ZBOOT + select HAVE_KERNEL_GZIP if !XIP_KERNEL && !EFI_ZBOOT + select HAVE_KERNEL_LZ4 if !XIP_KERNEL && !EFI_ZBOOT + select HAVE_KERNEL_LZMA if !XIP_KERNEL && !EFI_ZBOOT + select HAVE_KERNEL_LZO if !XIP_KERNEL && !EFI_ZBOOT + select HAVE_KERNEL_UNCOMPRESSED if !XIP_KERNEL && !EFI_ZBOOT + select HAVE_KERNEL_ZSTD if !XIP_KERNEL && !EFI_ZBOOT + select HAVE_KERNEL_XZ if !XIP_KERNEL && !EFI_ZBOOT select HAVE_KPROBES if !XIP_KERNEL - select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL select HAVE_KRETPROBES if !XIP_KERNEL # https://github.com/ClangBuiltLinux/linux/issues/1881 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if !LD_IS_LLD @@ -155,6 +195,7 @@ config RISCV select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_RETHOOK if !XIP_KERNEL select HAVE_RSEQ + select HAVE_RUST if RUSTC_SUPPORTS_RISCV && CC_IS_CLANG select HAVE_SAMPLE_FTRACE_DIRECT select HAVE_SAMPLE_FTRACE_DIRECT_MULTI select HAVE_STACKPROTECTOR @@ -166,13 +207,16 @@ config RISCV select LOCK_MM_AND_FIND_VMA select MMU_GATHER_RCU_TABLE_FREE if SMP && MMU select MODULES_USE_ELF_RELA if MODULES - select MODULE_SECTIONS if MODULES select OF select OF_EARLY_FLATTREE select OF_IRQ select PCI_DOMAINS_GENERIC if PCI + select PCI_ECAM if (ACPI && PCI) select PCI_MSI if PCI + select RELOCATABLE if !MMU && !PHYS_RAM_BASE_FIXED select RISCV_ALTERNATIVE if !XIP_KERNEL + select RISCV_APLIC + select RISCV_IMSIC select RISCV_INTC select RISCV_TIMER if RISCV_SBI select SIFIVE_PLIC @@ -181,8 +225,17 @@ config RISCV select THREAD_INFO_IN_TASK select TRACE_IRQFLAGS_SUPPORT select UACCESS_MEMCPY if !MMU + select VDSO_GETRANDOM if HAVE_GENERIC_VDSO + select USER_STACKTRACE_SUPPORT select ZONE_DMA32 if 64BIT +config RUSTC_SUPPORTS_RISCV + def_bool y + depends on 64BIT + # Shadow call stack requires rustc version 1.82+ due to use of the + # -Zsanitizer=shadow-call-stack flag. + depends on !SHADOW_CALL_STACK || RUSTC_VERSION >= 108200 + config CLANG_SUPPORTS_DYNAMIC_FTRACE def_bool CC_IS_CLANG # https://github.com/ClangBuiltLinux/linux/issues/1817 @@ -191,6 +244,7 @@ config CLANG_SUPPORTS_DYNAMIC_FTRACE config GCC_SUPPORTS_DYNAMIC_FTRACE def_bool CC_IS_GCC depends on $(cc-option,-fpatchable-function-entry=8) + depends on CC_HAS_MIN_FUNCTION_ALIGNMENT || !RISCV_ISA_C config HAVE_SHADOW_CALL_STACK def_bool $(cc-option,-fsanitize=shadow-call-stack) @@ -229,8 +283,12 @@ config ARCH_MMAP_RND_COMPAT_BITS_MAX # set if we run in machine mode, cleared if we run in supervisor mode config RISCV_M_MODE - bool - default !MMU + bool "Build a kernel that runs in machine mode" + depends on !MMU + default y + help + Select this option if you want to run the kernel in M-mode, + without the assistance of any other firmware. # set if we are running in S-mode and can use SBI calls config RISCV_SBI @@ -245,12 +303,6 @@ config MMU Select if you want MMU-based virtualised addressing space support by paged memory management. If unsure, say 'Y'. -config PAGE_OFFSET - hex - default 0xC0000000 if 32BIT && MMU - default 0x80000000 if !MMU - default 0xff60000000000000 if 64BIT - config KASAN_SHADOW_OFFSET hex depends on KASAN_GENERIC @@ -295,6 +347,11 @@ config GENERIC_HWEIGHT config FIX_EARLYCON_MEM def_bool MMU +config ILLEGAL_POINTER_VALUE + hex + default 0 if 32BIT + default 0xdead000000000000 if 64BIT + config PGTABLE_LEVELS int default 5 if 64BIT @@ -463,6 +520,39 @@ config NODES_SHIFT Specify the maximum number of NUMA Nodes available on the target system. Increases memory reserved to accommodate various tables. +choice + prompt "RISC-V spinlock type" + default RISCV_COMBO_SPINLOCKS + +config RISCV_TICKET_SPINLOCKS + bool "Using ticket spinlock" + +config RISCV_QUEUED_SPINLOCKS + bool "Using queued spinlock" + depends on SMP && MMU && NONPORTABLE + select ARCH_USE_QUEUED_SPINLOCKS + help + The queued spinlock implementation requires the forward progress + guarantee of cmpxchg()/xchg() atomic operations: CAS with Zabha or + LR/SC with Ziccrse provide such guarantee. + + Select this if and only if Zabha or Ziccrse is available on your + platform, RISCV_QUEUED_SPINLOCKS must not be selected for platforms + without one of those extensions. + + If unsure, select RISCV_COMBO_SPINLOCKS, which will use qspinlocks + when supported and otherwise ticket spinlocks. + +config RISCV_COMBO_SPINLOCKS + bool "Using combo spinlock" + depends on SMP && MMU + select ARCH_USE_QUEUED_SPINLOCKS + help + Embed both queued spinlock and ticket lock so that the spinlock + implementation can be chosen at runtime. + +endchoice + config RISCV_ALTERNATIVE bool depends on !XIP_KERNEL @@ -484,18 +574,30 @@ config RISCV_ISA_C help Adds "C" to the ISA subsets that the toolchain is allowed to emit when building Linux, which results in compressed instructions in the - Linux binary. + Linux binary. This option produces a kernel that will not run on + systems that do not support compressed instructions. If you don't know what to do here, say Y. +config RISCV_ISA_SUPM + bool "Supm extension for userspace pointer masking" + depends on 64BIT + default y + help + Add support for pointer masking in userspace (Supm) when the + underlying hardware extension (Smnpm or Ssnpm) is detected at boot. + + If this option is disabled, userspace will be unable to use + the prctl(PR_{SET,GET}_TAGGED_ADDR_CTRL) API. + config RISCV_ISA_SVNAPOT bool "Svnapot extension support for supervisor mode NAPOT pages" depends on 64BIT && MMU depends on RISCV_ALTERNATIVE default y help - Allow kernel to detect the Svnapot ISA-extension dynamically at boot - time and enable its usage. + Enable support for the Svnapot ISA-extension when it is detected + at boot. The Svnapot extension is used to mark contiguous PTEs as a range of contiguous virtual-to-physical translations for a naturally @@ -513,9 +615,8 @@ config RISCV_ISA_SVPBMT depends on RISCV_ALTERNATIVE default y help - Adds support to dynamically detect the presence of the Svpbmt - ISA-extension (Supervisor-mode: page-based memory types) and - enable its usage. + Add support for the Svpbmt ISA-extension (Supervisor-mode: + page-based memory types) in the kernel when it is detected at boot. The memory type for a page contains a combination of attributes that indicate the cacheability, idempotency, and ordering @@ -528,20 +629,21 @@ config RISCV_ISA_SVPBMT config TOOLCHAIN_HAS_V bool default y - depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64iv) - depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32iv) + depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64imv) + depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32imv) depends on LLD_VERSION >= 140000 || LD_VERSION >= 23800 depends on AS_HAS_OPTION_ARCH config RISCV_ISA_V - bool "VECTOR extension support" + bool "Vector extension support" depends on TOOLCHAIN_HAS_V depends on FPU select DYNAMIC_SIGFRAME default y help - Say N here if you want to disable all vector related procedure - in the kernel. + Add support for the Vector extension when it is detected at boot. + When this option is disabled, neither the kernel nor userspace may + use vector procedures. If you don't know what to do here, say Y. @@ -571,12 +673,59 @@ config RISCV_ISA_V_PREEMPTIVE default y help Usually, in-kernel SIMD routines are run with preemption disabled. - Functions which envoke long running SIMD thus must yield core's + Functions which invoke long running SIMD thus must yield the core's vector unit to prevent blocking other tasks for too long. - This config allows kernel to run SIMD without explicitly disable - preemption. Enabling this config will result in higher memory - consumption due to the allocation of per-task's kernel Vector context. + This config allows the kernel to run SIMD without explicitly disabling + preemption. Enabling this config will result in higher memory consumption + due to the allocation of per-task's kernel Vector context. + +config RISCV_ISA_ZAWRS + bool "Zawrs extension support for more efficient busy waiting" + depends on RISCV_ALTERNATIVE + default y + help + The Zawrs extension defines instructions to be used in polling loops + which allow a hart to enter a low-power state or to trap to the + hypervisor while waiting on a store to a memory location. Enable the + use of these instructions in the kernel when the Zawrs extension is + detected at boot. + +config TOOLCHAIN_HAS_ZABHA + bool + default y + depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zabha) + depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zabha) + depends on AS_HAS_OPTION_ARCH + +config RISCV_ISA_ZABHA + bool "Zabha extension support for atomic byte/halfword operations" + depends on TOOLCHAIN_HAS_ZABHA + depends on RISCV_ALTERNATIVE + default y + help + Enable the use of the Zabha ISA-extension to implement kernel + byte/halfword atomic memory operations when it is detected at boot. + + If you don't know what to do here, say Y. + +config TOOLCHAIN_HAS_ZACAS + bool + default y + depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zacas) + depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zacas) + depends on AS_HAS_OPTION_ARCH + +config RISCV_ISA_ZACAS + bool "Zacas extension support for atomic CAS" + depends on TOOLCHAIN_HAS_ZACAS + depends on RISCV_ALTERNATIVE + default y + help + Enable the use of the Zacas ISA-extension to implement kernel atomic + cmpxchg operations when it is detected at boot. + + If you don't know what to do here, say Y. config TOOLCHAIN_HAS_ZBB bool @@ -593,15 +742,34 @@ config TOOLCHAIN_HAS_VECTOR_CRYPTO def_bool $(as-instr, .option arch$(comma) +v$(comma) +zvkb) depends on AS_HAS_OPTION_ARCH +config TOOLCHAIN_HAS_ZBA + bool + default y + depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zba) + depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zba) + depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900 + depends on AS_HAS_OPTION_ARCH + +config RISCV_ISA_ZBA + bool "Zba extension support for bit manipulation instructions" + default y + help + Add support for enabling optimisations in the kernel when the Zba + extension is detected at boot. + + The Zba extension provides instructions to accelerate the generation + of addresses that index into arrays of basic data types. + + If you don't know what to do here, say Y. + config RISCV_ISA_ZBB bool "Zbb extension support for bit manipulation instructions" - depends on TOOLCHAIN_HAS_ZBB - depends on MMU depends on RISCV_ALTERNATIVE default y help - Adds support to dynamically detect the presence of the ZBB - extension (basic bit manipulation) and enable its usage. + Add support for enabling optimisations in the kernel when the + Zbb extension is detected at boot. Some optimisations may + additionally depend on toolchain support for Zbb. The Zbb extension provides instructions to accelerate a number of bit-specific operations (count bit population, sign extending, @@ -609,6 +777,51 @@ config RISCV_ISA_ZBB If you don't know what to do here, say Y. +config TOOLCHAIN_HAS_ZBC + bool + default y + depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zbc) + depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zbc) + depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900 + depends on AS_HAS_OPTION_ARCH + +config RISCV_ISA_ZBC + bool "Zbc extension support for carry-less multiplication instructions" + depends on TOOLCHAIN_HAS_ZBC + depends on MMU + depends on RISCV_ALTERNATIVE + default y + help + Adds support to dynamically detect the presence of the Zbc + extension (carry-less multiplication) and enable its usage. + + The Zbc extension could accelerate CRC (cyclic redundancy check) + calculations. + + If you don't know what to do here, say Y. + +config TOOLCHAIN_HAS_ZBKB + bool + default y + depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zbkb) + depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zbkb) + depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900 + depends on AS_HAS_OPTION_ARCH + +config RISCV_ISA_ZBKB + bool "Zbkb extension support for bit manipulation instructions" + depends on TOOLCHAIN_HAS_ZBKB + depends on RISCV_ALTERNATIVE + default y + help + Adds support to dynamically detect the presence of the ZBKB + extension (bit manipulation for cryptography) and enable its usage. + + The Zbkb extension provides instructions to accelerate a number + of common cryptography operations (pack, zip, etc). + + If you don't know what to do here, say Y. + config RISCV_ISA_ZICBOM bool "Zicbom extension support for non-coherent DMA operation" depends on MMU @@ -617,9 +830,9 @@ config RISCV_ISA_ZICBOM select RISCV_DMA_NONCOHERENT select DMA_DIRECT_REMAP help - Adds support to dynamically detect the presence of the ZICBOM - extension (Cache Block Management Operations) and enable its - usage. + Add support for the Zicbom extension (Cache Block Management + Operations) and enable its use in the kernel when it is detected + at boot. The Zicbom extension can be used to handle for example non-coherent DMA support on devices that need it. @@ -628,23 +841,30 @@ config RISCV_ISA_ZICBOM config RISCV_ISA_ZICBOZ bool "Zicboz extension support for faster zeroing of memory" - depends on MMU depends on RISCV_ALTERNATIVE default y help Enable the use of the Zicboz extension (cbo.zero instruction) - when available. + in the kernel when it is detected at boot. The Zicboz extension is used for faster zeroing of memory. If you don't know what to do here, say Y. -config TOOLCHAIN_HAS_ZIHINTPAUSE - bool +config RISCV_ISA_ZICBOP + bool "Zicbop extension support for cache block prefetch" + depends on MMU + depends on RISCV_ALTERNATIVE default y - depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zihintpause) - depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zihintpause) - depends on LLD_VERSION >= 150000 || LD_VERSION >= 23600 + help + Adds support to dynamically detect the presence of the ZICBOP + extension (Cache Block Prefetch Operations) and enable its + usage. + + The Zicbop extension can be used to prefetch cache blocks for + read/write fetch. + + If you don't know what to do here, say Y. config TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI def_bool y @@ -678,8 +898,9 @@ config FPU bool "FPU support" default y help - Say N here if you want to disable all floating-point related procedure - in the kernel. + Add support for floating point operations when an FPU is detected at + boot. When this option is disabled, neither the kernel nor userspace + may use the floating point unit. If you don't know what to do here, say Y. @@ -695,8 +916,7 @@ config IRQ_STACKS config THREAD_SIZE_ORDER int "Kernel stack size (in power-of-two numbers of page size)" if VMAP_STACK && EXPERT range 0 4 - default 1 if 32BIT && !KASAN - default 3 if 64BIT && KASAN + default 1 if 32BIT default 2 help Specify the Pages of thread stack size (from 4KB to 64KB), which also @@ -704,10 +924,24 @@ config THREAD_SIZE_ORDER config RISCV_MISALIGNED bool + help + Embed support for detecting and emulating misaligned + scalar or vector loads and stores. + +config RISCV_SCALAR_MISALIGNED + bool + select RISCV_MISALIGNED select SYSCTL_ARCH_UNALIGN_ALLOW help Embed support for emulating misaligned loads and stores. +config RISCV_VECTOR_MISALIGNED + bool + select RISCV_MISALIGNED + depends on RISCV_ISA_V + help + Enable detecting support for vector misaligned loads and stores. + choice prompt "Unaligned Accesses Support" default RISCV_PROBE_UNALIGNED_ACCESS @@ -719,7 +953,7 @@ choice config RISCV_PROBE_UNALIGNED_ACCESS bool "Probe for hardware unaligned access support" - select RISCV_MISALIGNED + select RISCV_SCALAR_MISALIGNED help During boot, the kernel will run a series of tests to determine the speed of unaligned accesses. This probing will dynamically determine @@ -730,7 +964,7 @@ config RISCV_PROBE_UNALIGNED_ACCESS config RISCV_EMULATED_UNALIGNED_ACCESS bool "Emulate unaligned access where system support is missing" - select RISCV_MISALIGNED + select RISCV_SCALAR_MISALIGNED help If unaligned memory accesses trap into the kernel as they are not supported by the system, the kernel will emulate the unaligned @@ -759,6 +993,48 @@ config RISCV_EFFICIENT_UNALIGNED_ACCESS endchoice +choice + prompt "Vector unaligned Accesses Support" + depends on RISCV_ISA_V + default RISCV_PROBE_VECTOR_UNALIGNED_ACCESS + help + This determines the level of support for vector unaligned accesses. This + information is used by the kernel to perform optimizations. It is also + exposed to user space via the hwprobe syscall. The hardware will be + probed at boot by default. + +config RISCV_PROBE_VECTOR_UNALIGNED_ACCESS + bool "Probe speed of vector unaligned accesses" + select RISCV_VECTOR_MISALIGNED + depends on RISCV_ISA_V + help + During boot, the kernel will run a series of tests to determine the + speed of vector unaligned accesses if they are supported. This probing + will dynamically determine the speed of vector unaligned accesses on + the underlying system if they are supported. + +config RISCV_SLOW_VECTOR_UNALIGNED_ACCESS + bool "Assume the system supports slow vector unaligned memory accesses" + depends on NONPORTABLE + help + Assume that the system supports slow vector unaligned memory accesses. The + kernel and userspace programs may not be able to run at all on systems + that do not support unaligned memory accesses. + +config RISCV_EFFICIENT_VECTOR_UNALIGNED_ACCESS + bool "Assume the system supports fast vector unaligned memory accesses" + depends on NONPORTABLE + help + Assume that the system supports fast vector unaligned memory accesses. When + enabled, this option improves the performance of the kernel on such + systems. However, the kernel and userspace programs will run much more + slowly, or will not be able to run at all, on systems that do not + support efficient unaligned memory accesses. + +endchoice + +source "arch/riscv/Kconfig.vendor" + endmenu # "Platform type" menu "Kernel features" @@ -815,6 +1091,9 @@ config ARCH_SUPPORTS_KEXEC_PURGATORY config ARCH_SUPPORTS_CRASH_DUMP def_bool y +config ARCH_DEFAULT_CRASH_DUMP + def_bool y + config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION def_bool CRASH_RESERVE @@ -851,7 +1130,9 @@ config PARAVIRT_TIME_ACCOUNTING config RELOCATABLE bool "Build a relocatable kernel" - depends on MMU && 64BIT && !XIP_KERNEL + depends on !XIP_KERNEL + select MODULE_SECTIONS if MODULES + select ARCH_VMLINUX_NEEDS_RELOCS help This builds a kernel as a Position Independent Executable (PIE), which retains all relocation metadata required to relocate the @@ -898,7 +1179,8 @@ config CMDLINE line here and choose how the kernel should use it later on. choice - prompt "Built-in command line usage" if CMDLINE != "" + prompt "Built-in command line usage" + depends on CMDLINE != "" default CMDLINE_FALLBACK help Choose how the kernel will handle the provided built-in command @@ -913,8 +1195,8 @@ config CMDLINE_FALLBACK config CMDLINE_EXTEND bool "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 + The built-in command line will be appended to the command- + line arguments provided during boot. This is useful in cases where the provided arguments are insufficient and you don't want to or cannot modify them. @@ -951,6 +1233,17 @@ config EFI allow the kernel to be booted as an EFI application. This is only useful on systems that have UEFI firmware. +config DMI + bool "Enable support for SMBIOS (DMI) tables" + depends on EFI + default y + help + This enables SMBIOS/DMI feature for systems. + + This option is only useful on systems that have UEFI firmware. + However, even with this option, the resultant kernel should + continue to boot on existing non-UEFI platforms. + config CC_HAVE_STACKPROTECTOR_TLS def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0) @@ -1032,13 +1325,14 @@ config RISCV_ISA_FALLBACK config BUILTIN_DTB bool "Built-in device tree" depends on OF && NONPORTABLE + select GENERIC_BUILTIN_DTB help Build a device tree into the Linux image. This option should be selected if no bootloader is being used. If unsure, say N. -config BUILTIN_DTB_SOURCE +config BUILTIN_DTB_NAME string "Built-in device tree source" depends on BUILTIN_DTB help |