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Tue, 18 Mar 2025 17:38:59 -0700 (PDT) From: Charlie Jenkins Date: Tue, 18 Mar 2025 17:38:45 -0700 Subject: [PATCH v9 1/2] riscv: Move nop definition to insn-def.h Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250318-runtime_const_riscv-v9-1-ddd3534d3e8e@rivosinc.com> References: <20250318-runtime_const_riscv-v9-0-ddd3534d3e8e@rivosinc.com> In-Reply-To: <20250318-runtime_const_riscv-v9-0-ddd3534d3e8e@rivosinc.com> To: Paul Walmsley , Palmer Dabbelt , Ard Biesheuvel , Ben Dooks , Pasha Bouzarjomehri , Emil Renner Berthing , Alexandre Ghiti , Steven Rostedt , Masami Hiramatsu , Mark Rutland , Albert Ou , Peter Zijlstra , Josh Poimboeuf , Jason Baron Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Charlie Jenkins X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=3569; i=charlie@rivosinc.com; h=from:subject:message-id; bh=nHhYXQAzGWOBz+fiRV2cBI9NDuh7wsnPI3XSuTaljL8=; b=owGbwMvMwCXWx5hUnlvL8Y3xtFoSQ/otIfkQ3duf1/8PsCmcejzUoDqoafJJ0wPHu/yXPd5/Q 51lfo17RykLgxgXg6yYIgvPtQbm1jv6ZUdFyybAzGFlAhnCwMUpABMRPsLwm+Ww5w7x5kVMnLa8 t+LDbVX0Y9PnnD4mHne38uwli52eUYwMa/Z8viB16td7F4dtzs18h594F500+n7n1QaOeyl/vrP P5wQA X-Developer-Key: i=charlie@rivosinc.com; a=openpgp; fpr=7D834FF11B1D8387E61C776FFB10D1F27D6B1354 We have duplicated the definition of the nop instruction in ftrace.h and in jump_label.c. Move this definition into the generic file insn-def.h so that they can share the definition with each other and with future files. Signed-off-by: Charlie Jenkins Reviewed-by: Alexandre Ghiti Tested-by: Alexandre Ghiti --- arch/riscv/include/asm/ftrace.h | 1 - arch/riscv/include/asm/insn-def.h | 2 ++ arch/riscv/kernel/ftrace.c | 6 +++--- arch/riscv/kernel/jump_label.c | 4 ++-- 4 files changed, 7 insertions(+), 6 deletions(-) diff --git a/arch/riscv/include/asm/ftrace.h b/arch/riscv/include/asm/ftrac= e.h index c4721ce44ca474654b37b3d51bc0a63d46bc1eff..b7f361a50f6445d02a0d88eef55= 47ee27c1fb52e 100644 --- a/arch/riscv/include/asm/ftrace.h +++ b/arch/riscv/include/asm/ftrace.h @@ -79,7 +79,6 @@ struct dyn_arch_ftrace { #define AUIPC_RA (0x00000097) #define JALR_T0 (0x000282e7) #define AUIPC_T0 (0x00000297) -#define NOP4 (0x00000013) =20 #define to_jalr_t0(offset) \ (((offset & JALR_OFFSET_MASK) << JALR_SHIFT) | JALR_T0) diff --git a/arch/riscv/include/asm/insn-def.h b/arch/riscv/include/asm/ins= n-def.h index 9a913010cdd93cdfdd93f467e7880e20cce0dd2b..0a1fc5134f29da190554c59f8ce= e3b5374c9aa2d 100644 --- a/arch/riscv/include/asm/insn-def.h +++ b/arch/riscv/include/asm/insn-def.h @@ -200,4 +200,6 @@ #define ZAWRS_WRS_NTO ".4byte 0x00d00073" #define ZAWRS_WRS_STO ".4byte 0x01d00073" =20 +#define RISCV_INSN_NOP4 0x00000013U + #endif /* __ASM_INSN_DEF_H */ diff --git a/arch/riscv/kernel/ftrace.c b/arch/riscv/kernel/ftrace.c index 3524db5e4fa014a4594465f849d898a030bfb7b8..674dcdfae7a149c339f1e791adb= 450535f22991b 100644 --- a/arch/riscv/kernel/ftrace.c +++ b/arch/riscv/kernel/ftrace.c @@ -36,7 +36,7 @@ static int ftrace_check_current_call(unsigned long hook_p= os, unsigned int *expected) { unsigned int replaced[2]; - unsigned int nops[2] =3D {NOP4, NOP4}; + unsigned int nops[2] =3D {RISCV_INSN_NOP4, RISCV_INSN_NOP4}; =20 /* we expect nops at the hook position */ if (!expected) @@ -68,7 +68,7 @@ static int __ftrace_modify_call(unsigned long hook_pos, u= nsigned long target, bool enable, bool ra) { unsigned int call[2]; - unsigned int nops[2] =3D {NOP4, NOP4}; + unsigned int nops[2] =3D {RISCV_INSN_NOP4, RISCV_INSN_NOP4}; =20 if (ra) make_call_ra(hook_pos, target, call); @@ -97,7 +97,7 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned lon= g addr) int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec, unsigned long addr) { - unsigned int nops[2] =3D {NOP4, NOP4}; + unsigned int nops[2] =3D {RISCV_INSN_NOP4, RISCV_INSN_NOP4}; =20 if (patch_insn_write((void *)rec->ip, nops, MCOUNT_INSN_SIZE)) return -EPERM; diff --git a/arch/riscv/kernel/jump_label.c b/arch/riscv/kernel/jump_label.c index 654ed159c830b3d5e34ac58bf367107066eb73a1..b4c1a6a3fbd28533552036194f2= 7ed206bea305d 100644 --- a/arch/riscv/kernel/jump_label.c +++ b/arch/riscv/kernel/jump_label.c @@ -11,8 +11,8 @@ #include #include #include +#include =20 -#define RISCV_INSN_NOP 0x00000013U #define RISCV_INSN_JAL 0x0000006fU =20 bool arch_jump_label_transform_queue(struct jump_entry *entry, @@ -33,7 +33,7 @@ bool arch_jump_label_transform_queue(struct jump_entry *e= ntry, (((u32)offset & GENMASK(10, 1)) << (21 - 1)) | (((u32)offset & GENMASK(20, 20)) << (31 - 20)); 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Tue, 18 Mar 2025 17:39:01 -0700 (PDT) Received: from charlie.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-225c6bbe890sm100843415ad.188.2025.03.18.17.39.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Mar 2025 17:39:00 -0700 (PDT) From: Charlie Jenkins Date: Tue, 18 Mar 2025 17:38:46 -0700 Subject: [PATCH v9 2/2] riscv: Add runtime constant support Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250318-runtime_const_riscv-v9-2-ddd3534d3e8e@rivosinc.com> References: <20250318-runtime_const_riscv-v9-0-ddd3534d3e8e@rivosinc.com> In-Reply-To: <20250318-runtime_const_riscv-v9-0-ddd3534d3e8e@rivosinc.com> To: Paul Walmsley , Palmer Dabbelt , Ard Biesheuvel , Ben Dooks , Pasha Bouzarjomehri , Emil Renner Berthing , Alexandre Ghiti , Steven Rostedt , Masami Hiramatsu , Mark Rutland , Albert Ou , Peter Zijlstra , Josh Poimboeuf , Jason Baron Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Charlie Jenkins X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=11402; i=charlie@rivosinc.com; h=from:subject:message-id; bh=6NxMsf9l7XhYdvNMjykcrSEZ7mA6J1gQi9sA+71cr8I=; b=owGbwMvMwCXWx5hUnlvL8Y3xtFoSQ/otIfnQbPkSKdnzn5M0ky5J/rY6sEMoS/bt3taj84smM bW8OyjTUcrCIMbFICumyMJzrYG59Y5+2VHRsgkwc1iZQIYwcHEKwERcshj+Well69xZ8eOum+wC 6aPX7u4uvZYhP+PsJgYWPs7al79UAxgZJqWpvn4kdPWYyKxPDIf+VervYlnm7zXl5frX4kYMOZn eLAA= X-Developer-Key: i=charlie@rivosinc.com; a=openpgp; fpr=7D834FF11B1D8387E61C776FFB10D1F27D6B1354 Implement the runtime constant infrastructure for riscv. Use this infrastructure to generate constants to be used by the d_hash() function. This is the riscv variant of commit 94a2bc0f611c ("arm64: add 'runtime constant' support") and commit e3c92e81711d ("runtime constants: add x86 architecture support"). Signed-off-by: Charlie Jenkins Reviewed-by: Alexandre Ghiti Tested-by: Alexandre Ghiti --- arch/riscv/Kconfig | 22 +++ arch/riscv/include/asm/asm.h | 1 + arch/riscv/include/asm/runtime-const.h | 265 +++++++++++++++++++++++++++++= ++++ arch/riscv/kernel/vmlinux.lds.S | 3 + 4 files changed, 291 insertions(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 7612c52e9b1e35607f1dd4603a596416d3357a71..c123f7c0579c1aca839e3c04bdb= 662d6856ae765 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -783,6 +783,28 @@ config RISCV_ISA_ZBC =20 If you don't know what to do here, say Y. =20 +config TOOLCHAIN_HAS_ZBKB + bool + default y + depends on !64BIT || $(cc-option,-mabi=3Dlp64 -march=3Drv64ima_zbkb) + depends on !32BIT || $(cc-option,-mabi=3Dilp32 -march=3Drv32ima_zbkb) + depends on LLD_VERSION >=3D 150000 || LD_VERSION >=3D 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 diff --git a/arch/riscv/include/asm/asm.h b/arch/riscv/include/asm/asm.h index 776354895b81e7dc332e58265548aaf7365a6037..a8a2af6dfe9d2406625ca8fc940= 14fe5180e4fec 100644 --- a/arch/riscv/include/asm/asm.h +++ b/arch/riscv/include/asm/asm.h @@ -27,6 +27,7 @@ #define REG_ASM __REG_SEL(.dword, .word) #define SZREG __REG_SEL(8, 4) #define LGREG __REG_SEL(3, 2) +#define SRLI __REG_SEL(srliw, srli) =20 #if __SIZEOF_POINTER__ =3D=3D 8 #ifdef __ASSEMBLY__ diff --git a/arch/riscv/include/asm/runtime-const.h b/arch/riscv/include/as= m/runtime-const.h new file mode 100644 index 0000000000000000000000000000000000000000..a23a9bd47903b2765608c75cd83= f01ae578dffaa --- /dev/null +++ b/arch/riscv/include/asm/runtime-const.h @@ -0,0 +1,265 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_RISCV_RUNTIME_CONST_H +#define _ASM_RISCV_RUNTIME_CONST_H + +#include +#include +#include +#include +#include +#include + +#include + +#ifdef CONFIG_32BIT +#define runtime_const_ptr(sym) \ +({ \ + typeof(sym) __ret; \ + asm_inline(".option push\n\t" \ + ".option norvc\n\t" \ + "1:\t" \ + "lui %[__ret],0x89abd\n\t" \ + "addi %[__ret],%[__ret],-0x211\n\t" \ + ".option pop\n\t" \ + ".pushsection runtime_ptr_" #sym ",\"a\"\n\t" \ + ".long 1b - .\n\t" \ + ".popsection" \ + : [__ret] "=3Dr" (__ret)); \ + __ret; \ +}) +#else +/* + * Loading 64-bit constants into a register from immediates is a non-trivi= al + * task on riscv64. To get it somewhat performant, load 32 bits into two + * different registers and then combine the results. + * + * If the processor supports the Zbkb extension, we can combine the final + * "slli,slli,srli,add" into the single "pack" instruction. If the process= or + * doesn't support Zbkb but does support the Zbb extension, we can + * combine the final "slli,srli,add" into one instruction "add.uw". + */ +#define RISCV_RUNTIME_CONST_64_PREAMBLE \ + ".option push\n\t" \ + ".option norvc\n\t" \ + "1:\t" \ + "lui %[__ret],0x89abd\n\t" \ + "lui %[__tmp],0x1234\n\t" \ + "addiw %[__ret],%[__ret],-0x211\n\t" \ + "addiw %[__tmp],%[__tmp],0x567\n\t" \ + +#define RISCV_RUNTIME_CONST_64_BASE \ + "slli %[__tmp],%[__tmp],32\n\t" \ + "slli %[__ret],%[__ret],32\n\t" \ + "srli %[__ret],%[__ret],32\n\t" \ + "add %[__ret],%[__ret],%[__tmp]\n\t" \ + +#define RISCV_RUNTIME_CONST_64_ZBA \ + ".option push\n\t" \ + ".option arch,+zba\n\t" \ + "slli %[__tmp],%[__tmp],32\n\t" \ + "add.uw %[__ret],%[__ret],%[__tmp]\n\t" \ + "nop\n\t" \ + "nop\n\t" \ + ".option pop\n\t" \ + +#define RISCV_RUNTIME_CONST_64_ZBKB \ + ".option push\n\t" \ + ".option arch,+zbkb\n\t" \ + "pack %[__ret],%[__ret],%[__tmp]\n\t" \ + "nop\n\t" \ + "nop\n\t" \ + "nop\n\t" \ + ".option pop\n\t" \ + +#define RISCV_RUNTIME_CONST_64_POSTAMBLE(sym) \ + ".option pop\n\t" \ + ".pushsection runtime_ptr_" #sym ",\"a\"\n\t" \ + ".long 1b - .\n\t" \ + ".popsection" \ + +#if defined(CONFIG_RISCV_ISA_ZBA) && defined(CONFIG_RISCV_ISA_ZBKB) +#define runtime_const_ptr(sym) \ +({ \ + typeof(sym) __ret, __tmp; \ + asm_inline(RISCV_RUNTIME_CONST_64_PREAMBLE \ + ALTERNATIVE_2( \ + RISCV_RUNTIME_CONST_64_BASE, \ + RISCV_RUNTIME_CONST_64_ZBA, \ + 0, RISCV_ISA_EXT_ZBA, 1, \ + RISCV_RUNTIME_CONST_64_ZBKB, \ + 0, RISCV_ISA_EXT_ZBKB, 1 \ + ) \ + RISCV_RUNTIME_CONST_64_POSTAMBLE(sym) \ + : [__ret] "=3Dr" (__ret), [__tmp] "=3Dr" (__tmp)); \ + __ret; \ +}) +#elif defined(CONFIG_RISCV_ISA_ZBA) +#define runtime_const_ptr(sym) \ +({ \ + typeof(sym) __ret, __tmp; \ + asm_inline(RISCV_RUNTIME_CONST_64_PREAMBLE \ + ALTERNATIVE( \ + RISCV_RUNTIME_CONST_64_BASE, \ + RISCV_RUNTIME_CONST_64_ZBA, \ + 0, RISCV_ISA_EXT_ZBA, 1 \ + ) \ + RISCV_RUNTIME_CONST_64_POSTAMBLE(sym) \ + : [__ret] "=3Dr" (__ret), [__tmp] "=3Dr" (__tmp)); \ + __ret; \ +}) +#elif defined(CONFIG_RISCV_ISA_ZBKB) +#define runtime_const_ptr(sym) \ +({ \ + typeof(sym) __ret, __tmp; \ + asm_inline(RISCV_RUNTIME_CONST_64_PREAMBLE \ + ALTERNATIVE( \ + RISCV_RUNTIME_CONST_64_BASE, \ + RISCV_RUNTIME_CONST_64_ZBKB, \ + 0, RISCV_ISA_EXT_ZBKB, 1 \ + ) \ + RISCV_RUNTIME_CONST_64_POSTAMBLE(sym) \ + : [__ret] "=3Dr" (__ret), [__tmp] "=3Dr" (__tmp)); \ + __ret; \ +}) +#else +#define runtime_const_ptr(sym) \ +({ \ + typeof(sym) __ret, __tmp; \ + asm_inline(RISCV_RUNTIME_CONST_64_PREAMBLE \ + RISCV_RUNTIME_CONST_64_BASE \ + RISCV_RUNTIME_CONST_64_POSTAMBLE(sym) \ + : [__ret] "=3Dr" (__ret), [__tmp] "=3Dr" (__tmp)); \ + __ret; \ +}) +#endif +#endif + +#define runtime_const_shift_right_32(val, sym) \ +({ \ + u32 __ret; \ + asm_inline(".option push\n\t" \ + ".option norvc\n\t" \ + "1:\t" \ + SRLI " %[__ret],%[__val],12\n\t" \ + ".option pop\n\t" \ + ".pushsection runtime_shift_" #sym ",\"a\"\n\t" \ + ".long 1b - .\n\t" \ + ".popsection" \ + : [__ret] "=3Dr" (__ret) \ + : [__val] "r" (val)); \ + __ret; \ +}) + +#define runtime_const_init(type, sym) do { \ + extern s32 __start_runtime_##type##_##sym[]; \ + extern s32 __stop_runtime_##type##_##sym[]; \ + \ + runtime_const_fixup(__runtime_fixup_##type, \ + (unsigned long)(sym), \ + __start_runtime_##type##_##sym, \ + __stop_runtime_##type##_##sym); \ +} while (0) + +static inline void __runtime_fixup_caches(void *where, unsigned int insns) +{ + /* On riscv there are currently only cache-wide flushes so va is ignored.= */ + __always_unused uintptr_t va =3D (uintptr_t)where; + + flush_icache_range(va, va + 4 * insns); +} + +/* + * The 32-bit immediate is stored in a lui+addi pairing. + * lui holds the upper 20 bits of the immediate in the first 20 bits of th= e instruction. + * addi holds the lower 12 bits of the immediate in the first 12 bits of t= he instruction. + */ +static inline void __runtime_fixup_32(__le16 *lui_parcel, __le16 *addi_par= cel, unsigned int val) +{ + unsigned int lower_immediate, upper_immediate; + u32 lui_insn, addi_insn, addi_insn_mask; + __le32 lui_res, addi_res; + + /* Mask out upper 12 bit of addi */ + addi_insn_mask =3D 0x000fffff; + + lui_insn =3D (u32)le16_to_cpu(lui_parcel[0]) | (u32)le16_to_cpu(lui_parce= l[1]) << 16; + addi_insn =3D (u32)le16_to_cpu(addi_parcel[0]) | (u32)le16_to_cpu(addi_pa= rcel[1]) << 16; + + lower_immediate =3D sign_extend32(val, 11); + upper_immediate =3D (val - lower_immediate); + + if (upper_immediate & 0xfffff000) { + /* replace upper 20 bits of lui with upper immediate */ + lui_insn &=3D 0x00000fff; + lui_insn |=3D upper_immediate & 0xfffff000; + } else { + /* replace lui with nop if immediate is small enough to fit in addi */ + lui_insn =3D RISCV_INSN_NOP4; + /*=20 + * lui is being skipped, so do a load instead of an add. A load + * is performed by adding with the x0 register. Setting rs to + * zero with the following mask will accomplish this goal. + */ + addi_insn_mask &=3D 0x07fff; + } + + if (lower_immediate & 0x00000fff) { + /* replace upper 12 bits of addi with lower 12 bits of val */ + addi_insn &=3D addi_insn_mask; + addi_insn |=3D (lower_immediate & 0x00000fff) << 20; + } else { + /* replace addi with nop if lower_immediate is empty */ + addi_insn =3D RISCV_INSN_NOP4; + } + + addi_res =3D cpu_to_le32(addi_insn); + lui_res =3D cpu_to_le32(lui_insn); + mutex_lock(&text_mutex); + patch_insn_write(addi_parcel, &addi_res, sizeof(addi_res)); + patch_insn_write(lui_parcel, &lui_res, sizeof(lui_res)); + mutex_unlock(&text_mutex); +} + +static inline void __runtime_fixup_ptr(void *where, unsigned long val) +{ +#ifdef CONFIG_32BIT + __runtime_fixup_32(where, where + 4, val); + __runtime_fixup_caches(where, 2); +#else + __runtime_fixup_32(where, where + 8, val); + __runtime_fixup_32(where + 4, where + 12, val >> 32); + __runtime_fixup_caches(where, 4); +#endif +} + +/* + * Replace the least significant 5 bits of the srli/srliw immediate that is + * located at bits 20-24 + */ +static inline void __runtime_fixup_shift(void *where, unsigned long val) +{ + __le16 *parcel =3D where; + __le32 res; + u32 insn; + + insn =3D (u32)le16_to_cpu(parcel[0]) | (u32)le16_to_cpu(parcel[1]) << 16; + + insn &=3D 0xfe0fffff; + insn |=3D (val & 0b11111) << 20; + + res =3D cpu_to_le32(insn); + mutex_lock(&text_mutex); + patch_text_nosync(where, &res, sizeof(insn)); + mutex_unlock(&text_mutex); +} + +static inline void runtime_const_fixup(void (*fn)(void *, unsigned long), + unsigned long val, s32 *start, s32 *end) +{ + while (start < end) { + fn(*start + (void *)start, val); + start++; + } +} + +#endif /* _ASM_RISCV_RUNTIME_CONST_H */ diff --git a/arch/riscv/kernel/vmlinux.lds.S b/arch/riscv/kernel/vmlinux.ld= s.S index 002ca58dd998cb78b662837b5ebac988fb6c77bb..61bd5ba6680a786bf1db7dc37bf= 1acda0639b5c7 100644 --- a/arch/riscv/kernel/vmlinux.lds.S +++ b/arch/riscv/kernel/vmlinux.lds.S @@ -97,6 +97,9 @@ SECTIONS { EXIT_DATA } + + RUNTIME_CONST_VARIABLES + PERCPU_SECTION(L1_CACHE_BYTES) =20 .rel.dyn : { --=20 2.43.0