diff options
71 files changed, 2676 insertions, 213 deletions
diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml b/Documentation/devicetree/bindings/riscv/cpus.yaml index 23646b684ea2..9d8670c00e3b 100644 --- a/Documentation/devicetree/bindings/riscv/cpus.yaml +++ b/Documentation/devicetree/bindings/riscv/cpus.yaml @@ -63,8 +63,8 @@ properties: mmu-type: description: - Identifies the MMU address translation mode used on this - hart. These values originate from the RISC-V Privileged + Identifies the largest MMU address translation mode supported by + this hart. These values originate from the RISC-V Privileged Specification document, available from https://riscv.org/specifications/ $ref: /schemas/types.yaml#/definitions/string @@ -80,6 +80,11 @@ properties: description: The blocksize in bytes for the Zicbom cache operations. + riscv,cbop-block-size: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + The blocksize in bytes for the Zicbop cache operations. + riscv,cboz-block-size: $ref: /schemas/types.yaml#/definitions/uint32 description: diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml index 27beedb98198..63d81dc895e5 100644 --- a/Documentation/devicetree/bindings/riscv/extensions.yaml +++ b/Documentation/devicetree/bindings/riscv/extensions.yaml @@ -48,7 +48,7 @@ properties: insensitive, letters in the riscv,isa string must be all lowercase. $ref: /schemas/types.yaml#/definitions/string - pattern: ^rv(?:64|32)imaf?d?q?c?b?k?j?p?v?h?(?:[hsxz](?:[a-z])+)?(?:_[hsxz](?:[a-z])+)*$ + pattern: ^rv(?:64|32)imaf?d?q?c?b?k?j?p?v?h?(?:[hsxz](?:[0-9a-z])+)?(?:_[hsxz](?:[0-9a-z])+)*$ deprecated: true riscv,isa-base: diff --git a/Documentation/features/vm/TLB/arch-support.txt b/Documentation/features/vm/TLB/arch-support.txt index 8fd22073a847..d222bd3ee749 100644 --- a/Documentation/features/vm/TLB/arch-support.txt +++ b/Documentation/features/vm/TLB/arch-support.txt @@ -20,7 +20,7 @@ | openrisc: | .. | | parisc: | TODO | | powerpc: | TODO | - | riscv: | TODO | + | riscv: | ok | | s390: | TODO | | sh: | TODO | | sparc: | TODO | diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index b549499eb363..bffbd869a068 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -53,6 +53,7 @@ config RISCV select ARCH_USE_MEMTEST select ARCH_USE_QUEUED_RWLOCKS select ARCH_USES_CFI_TRAPS if CFI_CLANG + select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH if SMP && MMU select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU select ARCH_WANT_FRAME_POINTERS select ARCH_WANT_GENERAL_HUGETLB if !RISCV_ISA_SVNAPOT @@ -66,9 +67,10 @@ config RISCV select CLINT_TIMER if !MMU select CLONE_BACKWARDS select COMMON_CLK - select CPU_PM if CPU_IDLE || HIBERNATION + select CPU_PM if CPU_IDLE || HIBERNATION || SUSPEND select EDAC_SUPPORT select FRAME_POINTER if PERF_EVENTS || (FUNCTION_TRACER && !DYNAMIC_FTRACE) + select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY if DYNAMIC_FTRACE select GENERIC_ARCH_TOPOLOGY select GENERIC_ATOMIC64 if !64BIT select GENERIC_CLOCKEVENTS_BROADCAST if SMP @@ -115,6 +117,7 @@ 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 HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL select HAVE_FUNCTION_GRAPH_TRACER @@ -142,6 +145,8 @@ config RISCV select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_RETHOOK if !XIP_KERNEL select HAVE_RSEQ + select HAVE_SAMPLE_FTRACE_DIRECT + select HAVE_SAMPLE_FTRACE_DIRECT_MULTI select HAVE_STACKPROTECTOR select HAVE_SYSCALL_TRACEPOINTS select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU @@ -183,6 +188,20 @@ config HAVE_SHADOW_CALL_STACK # https://github.com/riscv-non-isa/riscv-elf-psabi-doc/commit/a484e843e6eeb51f0cb7b8819e50da6d2444d769 depends on $(ld-option,--no-relax-gp) +config RISCV_USE_LINKER_RELAXATION + def_bool y + # https://github.com/llvm/llvm-project/commit/6611d58f5bbcbec77262d392e2923e1d680f6985 + depends on !LD_IS_LLD || LLD_VERSION >= 150000 + +# https://github.com/llvm/llvm-project/commit/bbc0f99f3bc96f1db16f649fc21dd18e5b0918f6 +config ARCH_HAS_BROKEN_DWARF5 + def_bool y + depends on RISCV_USE_LINKER_RELAXATION + # https://github.com/llvm/llvm-project/commit/1df5ea29b43690b6622db2cad7b745607ca4de6a + depends on AS_IS_LLVM && AS_VERSION < 180000 + # https://github.com/llvm/llvm-project/commit/7ffabb61a5569444b5ac9322e22e5471cc5e4a77 + depends on LD_IS_LLD && LLD_VERSION < 180000 + config ARCH_MMAP_RND_BITS_MIN default 18 if 64BIT default 8 @@ -529,6 +548,28 @@ config RISCV_ISA_V_DEFAULT_ENABLE If you don't know what to do here, say Y. +config RISCV_ISA_V_UCOPY_THRESHOLD + int "Threshold size for vectorized user copies" + depends on RISCV_ISA_V + default 768 + help + Prefer using vectorized copy_to_user()/copy_from_user() when the + workload size exceeds this value. + +config RISCV_ISA_V_PREEMPTIVE + bool "Run kernel-mode Vector with kernel preemption" + depends on PREEMPTION + depends on RISCV_ISA_V + default y + help + Usually, in-kernel SIMD routines are run with preemption disabled. + Functions which envoke long running SIMD thus must yield 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. + config TOOLCHAIN_HAS_ZBB bool default y @@ -655,6 +696,20 @@ config RISCV_MISALIGNED load/store for both kernel and userspace. When disable, misaligned accesses will generate SIGBUS in userspace and panic in kernel. +config RISCV_EFFICIENT_UNALIGNED_ACCESS + bool "Assume the CPU supports fast unaligned memory accesses" + depends on NONPORTABLE + select DCACHE_WORD_ACCESS if MMU + select HAVE_EFFICIENT_UNALIGNED_ACCESS + help + Say Y here if you want the kernel to assume that the CPU supports + efficient unaligned memory accesses. When enabled, this option + improves the performance of the kernel on such CPUs. However, the + kernel will run much more slowly, or will not be able to run at all, + on CPUs that do not support efficient unaligned memory accesses. + + If unsure what to do here, say N. + endmenu # "Platform type" menu "Kernel features" diff --git a/arch/riscv/Kconfig.errata b/arch/riscv/Kconfig.errata index f5c432b005e7..910ba8837add 100644 --- a/arch/riscv/Kconfig.errata +++ b/arch/riscv/Kconfig.errata @@ -98,6 +98,7 @@ config ERRATA_THEAD_CMO depends on ERRATA_THEAD && MMU select DMA_DIRECT_REMAP select RISCV_DMA_NONCOHERENT + select RISCV_NONSTANDARD_CACHE_OPS default y help This will apply the cache management errata to handle the diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile index a74be78678eb..0b7d109258e7 100644 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -43,8 +43,7 @@ else KBUILD_LDFLAGS += -melf32lriscv endif -ifeq ($(CONFIG_LD_IS_LLD),y) -ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 150000),y) +ifndef CONFIG_RISCV_USE_LINKER_RELAXATION KBUILD_CFLAGS += -mno-relax KBUILD_AFLAGS += -mno-relax ifndef CONFIG_AS_IS_LLVM @@ -52,7 +51,6 @@ ifndef CONFIG_AS_IS_LLVM KBUILD_AFLAGS += -Wa,-mno-relax endif endif -endif ifeq ($(CONFIG_SHADOW_CALL_STACK),y) KBUILD_LDFLAGS += --no-relax-gp @@ -108,7 +106,9 @@ KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax) # unaligned accesses. While unaligned accesses are explicitly allowed in the # RISC-V ISA, they're emulated by machine mode traps on all extant # architectures. It's faster to have GCC emit only aligned accesses. +ifneq ($(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS),y) KBUILD_CFLAGS += $(call cc-option,-mstrict-align) +endif ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) prepare: stack_protector_prepare @@ -163,6 +163,8 @@ BOOT_TARGETS := Image Image.gz loader loader.bin xipImage vmlinuz.efi all: $(notdir $(KBUILD_IMAGE)) +loader.bin: loader +Image.gz loader vmlinuz.efi: Image $(BOOT_TARGETS): vmlinux $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ @$(kecho) ' Kernel: $(boot)/$@ is ready' diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig index 905881282a7c..eaf34e871e30 100644 --- a/arch/riscv/configs/defconfig +++ b/arch/riscv/configs/defconfig @@ -149,6 +149,7 @@ CONFIG_SERIAL_8250_CONSOLE=y CONFIG_SERIAL_8250_DW=y CONFIG_SERIAL_OF_PLATFORM=y CONFIG_SERIAL_SH_SCI=y +CONFIG_SERIAL_EARLYCON_RISCV_SBI=y CONFIG_VIRTIO_CONSOLE=y CONFIG_HW_RANDOM=y CONFIG_HW_RANDOM_VIRTIO=y diff --git a/arch/riscv/errata/thead/errata.c b/arch/riscv/errata/thead/errata.c index 0554ed4bf087..b1c410bbc1ae 100644 --- a/arch/riscv/errata/thead/errata.c +++ b/arch/riscv/errata/thead/errata.c @@ -12,8 +12,10 @@ #include <asm/alternative.h> #include <asm/cacheflush.h> #include <asm/cpufeature.h> +#include <asm/dma-noncoherent.h> #include <asm/errata_list.h> #include <asm/hwprobe.h> +#include <asm/io.h> #include <asm/patch.h> #include <asm/vendorid_list.h> @@ -33,6 +35,69 @@ static bool errata_probe_pbmt(unsigned int stage, return false; } +/* + * th.dcache.ipa rs1 (invalidate, physical address) + * | 31 - 25 | 24 - 20 | 19 - 15 | 14 - 12 | 11 - 7 | 6 - 0 | + * 0000001 01010 rs1 000 00000 0001011 + * th.dcache.iva rs1 (invalidate, virtual address) + * 0000001 00110 rs1 000 00000 0001011 + * + * th.dcache.cpa rs1 (clean, physical address) + * | 31 - 25 | 24 - 20 | 19 - 15 | 14 - 12 | 11 - 7 | 6 - 0 | + * 0000001 01001 rs1 000 00000 0001011 + * th.dcache.cva rs1 (clean, virtual address) + * 0000001 00101 rs1 000 00000 0001011 + * + * th.dcache.cipa rs1 (clean then invalidate, physical address) + * | 31 - 25 | 24 - 20 | 19 - 15 | 14 - 12 | 11 - 7 | 6 - 0 | + * 0000001 01011 rs1 000 00000 0001011 + * th.dcache.civa rs1 (clean then invalidate, virtual address) + * 0000001 00111 rs1 000 00000 0001011 + * + * th.sync.s (make sure all cache operations finished) + * | 31 - 25 | 24 - 20 | 19 - 15 | 14 - 12 | 11 - 7 | 6 - 0 | + * 0000000 11001 00000 000 00000 0001011 + */ +#define THEAD_INVAL_A0 ".long 0x02a5000b" +#define THEAD_CLEAN_A0 ".long 0x0295000b" +#define THEAD_FLUSH_A0 ".long 0x02b5000b" +#define THEAD_SYNC_S ".long 0x0190000b" + +#define THEAD_CMO_OP(_op, _start, _size, _cachesize) \ +asm volatile("mv a0, %1\n\t" \ + "j 2f\n\t" \ + "3:\n\t" \ + THEAD_##_op##_A0 "\n\t" \ + "add a0, a0, %0\n\t" \ + "2:\n\t" \ + "bltu a0, %2, 3b\n\t" \ + THEAD_SYNC_S \ + : : "r"(_cachesize), \ + "r"((unsigned long)(_start) & ~((_cachesize) - 1UL)), \ + "r"((unsigned long)(_start) + (_size)) \ + : "a0") + +static void thead_errata_cache_inv(phys_addr_t paddr, size_t size) +{ + THEAD_CMO_OP(INVAL, paddr, size, riscv_cbom_block_size); +} + +static void thead_errata_cache_wback(phys_addr_t paddr, size_t size) +{ + THEAD_CMO_OP(CLEAN, paddr, size, riscv_cbom_block_size); +} + +static void thead_errata_cache_wback_inv(phys_addr_t paddr, size_t size) +{ + THEAD_CMO_OP(FLUSH, paddr, size, riscv_cbom_block_size); +} + +static const struct riscv_nonstd_cache_ops thead_errata_cmo_ops = { + .wback = &thead_errata_cache_wback, + .inv = &thead_errata_cache_inv, + .wback_inv = &thead_errata_cache_wback_inv, +}; + static bool errata_probe_cmo(unsigned int stage, unsigned long arch_id, unsigned long impid) { @@ -48,6 +113,7 @@ static bool errata_probe_cmo(unsigned int stage, if (stage == RISCV_ALTERNATIVES_BOOT) { riscv_cbom_block_size = L1_CACHE_BYTES; riscv_noncoherent_supported(); + riscv_noncoherent_register_cache_ops(&thead_errata_cmo_ops); } return true; @@ -77,8 +143,7 @@ static u32 thead_errata_probe(unsigned int stage, if (errata_probe_pbmt(stage, archid, impid)) cpu_req_errata |= BIT(ERRATA_THEAD_PBMT); - if (errata_probe_cmo(stage, archid, impid)) - cpu_req_errata |= BIT(ERRATA_THEAD_CMO); + errata_probe_cmo(stage, archid, impid); if (errata_probe_pmu(stage, archid, impid)) cpu_req_errata |= BIT(ERRATA_THEAD_PMU); diff --git a/arch/riscv/include/asm/arch_hweight.h b/arch/riscv/include/asm/arch_hweight.h new file mode 100644 index 000000000000..c20236a0725b --- /dev/null +++ b/arch/riscv/include/asm/arch_hweight.h @@ -0,0 +1,78 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Based on arch/x86/include/asm/arch_hweight.h + */ + +#ifndef _ASM_RISCV_HWEIGHT_H +#define _ASM_RISCV_HWEIGHT_H + +#include <asm/alternative-macros.h> +#include <asm/hwcap.h> + +#if (BITS_PER_LONG == 64) +#define CPOPW "cpopw " +#elif (BITS_PER_LONG == 32) +#define CPOPW "cpop " +#else +#error "Unexpected BITS_PER_LONG" +#endif + +static __always_inline unsigned int __arch_hweight32(unsigned int w) +{ +#ifdef CONFIG_RISCV_ISA_ZBB + asm_volatile_goto(ALTERNATIVE("j %l[legacy]", "nop", 0, + RISCV_ISA_EXT_ZBB, 1) + : : : : legacy); + + asm (".option push\n" + ".option arch,+zbb\n" + CPOPW "%0, %0\n" + ".option pop\n" + : "+r" (w) : :); + + return w; + +legacy: +#endif + return __sw_hweight32(w); +} + +static inline unsigned int __arch_hweight16(unsigned int w) +{ + return __arch_hweight32(w & 0xffff); +} + +static inline unsigned int __arch_hweight8(unsigned int w) +{ + return __arch_hweight32(w & 0xff); +} + +#if BITS_PER_LONG == 64 +static __always_inline unsigned long __arch_hweight64(__u64 w) +{ +# ifdef CONFIG_RISCV_ISA_ZBB + asm_volatile_goto(ALTERNATIVE("j %l[legacy]", "nop", 0, + RISCV_ISA_EXT_ZBB, 1) + : : : : legacy); + + asm (".option push\n" + ".option arch,+zbb\n" + "cpop %0, %0\n" + ".option pop\n" + : "+r" (w) : :); + + return w; + +legacy: +# endif + return __sw_hweight64(w); +} +#else /* BITS_PER_LONG == 64 */ +static inline unsigned long __arch_hweight64(__u64 w) +{ + return __arch_hweight32((u32)w) + + __arch_hweight32((u32)(w >> 32)); +} +#endif /* !(BITS_PER_LONG == 64) */ + +#endif /* _ASM_RISCV_HWEIGHT_H */ diff --git a/arch/riscv/include/asm/archrandom.h b/arch/riscv/include/asm/archrandom.h new file mode 100644 index 000000000000..5345360adfb9 --- /dev/null +++ b/arch/riscv/include/asm/archrandom.h @@ -0,0 +1,72 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Kernel interface for the RISCV arch_random_* functions + * + * Copyright (c) 2023 Rivos Inc. + * + */ + +#ifndef ASM_RISCV_ARCHRANDOM_H +#define ASM_RISCV_ARCHRANDOM_H + +#include <asm/csr.h> +#include <asm/processor.h> + +#define SEED_RETRY_LOOPS 100 + +static inline bool __must_check csr_seed_long(unsigned long *v) +{ + unsigned int retry = SEED_RETRY_LOOPS, valid_seeds = 0; + const int needed_seeds = sizeof(long) / sizeof(u16); + u16 *entropy = (u16 *)v; + + do { + /* + * The SEED CSR must be accessed with a read-write instruction. + */ + unsigned long csr_seed = csr_swap(CSR_SEED, 0); + unsigned long opst = csr_seed & SEED_OPST_MASK; + + switch (opst) { + case SEED_OPST_ES16: + entropy[valid_seeds++] = csr_seed & SEED_ENTROPY_MASK; + if (valid_seeds == needed_seeds) + return true; + break; + + case SEED_OPST_DEAD: + pr_err_once("archrandom: Unrecoverable error\n"); + return false; + + case SEED_OPST_BIST: + case SEED_OPST_WAIT: + default: + cpu_relax(); + continue; + } + } while (--retry); + + return false; +} + +static inline size_t __must_check arch_get_random_longs(unsigned long *v, size_t max_longs) +{ + return 0; +} + +static inline size_t __must_check arch_get_random_seed_longs(unsigned long *v, size_t max_longs) +{ + if (!max_longs) + return 0; + + /* + * If Zkr is supported and csr_seed_long succeeds, we return one long + * worth of entropy. + */ + if (riscv_has_extension_likely(RISCV_ISA_EXT_ZKR) && csr_seed_long(v)) + return 1; + + return 0; +} + +#endif /* ASM_RISCV_ARCHRANDOM_H */ diff --git a/arch/riscv/include/asm/asm-extable.h b/arch/riscv/include/asm/asm-extable.h index 00a96e7a9664..0c8bfd54fc4e 100644 --- a/arch/riscv/include/asm/asm-extable.h +++ b/arch/riscv/include/asm/asm-extable.h @@ -6,6 +6,7 @@ #define EX_TYPE_FIXUP 1 #define EX_TYPE_BPF 2 #define EX_TYPE_UACCESS_ERR_ZERO 3 +#define EX_TYPE_LOAD_UNALIGNED_ZEROPAD 4 #ifdef CONFIG_MMU @@ -47,6 +48,11 @@ #define EX_DATA_REG_ZERO_SHIFT 5 #define EX_DATA_REG_ZERO GENMASK(9, 5) |