From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f49.google.com (mail-pj1-f49.google.com [209.85.216.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2EA414A341C for ; Wed, 1 Jul 2026 12:31:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.49 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782909068; cv=none; b=E4aOu+oXD/Ugzcd6/hfwR350OE6a37OxrrWKjqO7KcbxTXwjbruOKMRtW0rvEs0oV+ImrT5faC+SbGELGmregCm3wA5zMyBdBN5gc/PKAPUL018EYfmDiAqQbGFgze3j4OUd93UEzq/0Px9atly21jukEDS/VtQV1oojw887yDw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782909068; c=relaxed/simple; bh=agvL7Ow6ssZvy/UdszdSPfkr19+5NGh/0V3SGLpStiw=; h=From:To:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=tDTDci4afIAyTPumn1bqULycIUumwh6KElwqJgmS1BOE0arXdP/wFNad3wOQ1XUWU1vyeopAS12vaT5xh1h7I2Sm83bfJuUk1l5MhruSZSHZY3XohzM/hCogagLldc5dA0IG0yt9wyWQcb0GM0LoKdO84b8eTT8zYQOWmNsqcrQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=bytedance.com; spf=pass smtp.mailfrom=bytedance.com; dkim=pass (2048-bit key) header.d=bytedance.com header.i=@bytedance.com header.b=QYllG7cL; arc=none smtp.client-ip=209.85.216.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=bytedance.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bytedance.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bytedance.com header.i=@bytedance.com header.b="QYllG7cL" Received: by mail-pj1-f49.google.com with SMTP id 98e67ed59e1d1-37fb17e1435so285701a91.1 for ; Wed, 01 Jul 2026 05:31:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1782909065; x=1783513865; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=cAJaR5LSpJ3CnGjWltmSLzlT17UwWjJ4qSirL9f+0QE=; b=QYllG7cLe18+IPTknBKA16jx+LpGBoj0B94/jOGGyw/PW9xPzBKqEEs4YjUI5TiDJh LG6lmCGKe26eHh+Qrs31rrrc6vmQaljSw7utfdlGYk9ODKaVcYWlM5fvpzmQAllp6zYL mdlImhf9JSBZSlry2MztdI35k34WEWM+mbGvL771YBx40kRwKNw6h0tWMkCbLQXIyuRH bHQ3cnNeKoloCxIhsf3DM9CCA2ElihFQOz8k/4JYYKaf1eqvaPu9DoKUSFCQSaU5eWFu lWdYDYOCMMs8q8dLmSlDv6Dt8DfjFB+9Ss0vHwdNnWD/GD9fE2nlPsPSwKB/ZbyWonFu 74gw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1782909065; x=1783513865; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-gg:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=cAJaR5LSpJ3CnGjWltmSLzlT17UwWjJ4qSirL9f+0QE=; b=qnTSlCJXdPclzSUxrq2MjYdQlt1ctXvclFyB2vjguzETvIUsjhvcLE4a0HagoJUIYK KWnyWdd8Diz9TFDnQ33k86vGZC5SjG3+L47MY3KKjVlXULfe5As0X6vsALjEn8P3O0IP NVWNBdd/3e5h76aRlaerWV24cLHuhPn8VDh9WcLqr7NCIWatEUyK5mu81EpbrIvXMMny qpv3MqwmE6MMo7hqhOJu9tOWGSmZ9VihhHa9gnpnoZgBeLtRgVHjq8N0kueGWPtHgIqb +yHSvRDWEYetpP5Yz8FpT8iMv1+8nIjQ+ehAbPGHJuWmK3q4E9/oQLADIDLUydFRK1qz X3Cg== X-Forwarded-Encrypted: i=1; AHgh+Rqo6JPNicCOs7pgM6r+oyUlEqXjDJM6LAmNH9NBL3vBw9AEw6fGDbXOaxeUMwNEOU3vB62k55CPUJxt@vger.kernel.org X-Gm-Message-State: AOJu0YyA4OxGvXl+PGquDzVMQmEqzEHO4YS3tuH+EnTnOXnaSfGEVTNj C3590bK6gT9x12CRGCU3aL57EGnElY49il94iLrA4Iak5pOVnqoFDxfAGzW4thJ6+EI= X-Gm-Gg: AfdE7cnJbS3c6glAZw+Pgq6nz0QYP2hPv1cpnW/LYm5e58RM1Zu3QTI7K8kBoaCKRtu uvjd84J+nlHXBU4XkhwyMB52Aj/5mL9p+C2FzA4MFllWCo3Y9JV9iA2pHW2hWOaeAKnbPDFeI5k RsBW4NOlMvpQKFGMWdWw02LAPd+WiLoxID20HGg/h2KT+ESXH7bkRx/x1Oy3QZi9kbAYW3VIO8V 8DdPYMi9YzE2zhvQ2z5mzBs+hLFkKf/9dO/PeaLENyGI2LFKgcRYf3q4DjSHFLVNqjydw70HoDu 4FjS8b4QNjQ/rEx6ZWiB4wwhcwbzgAz89E4WMzJaaAO8Hh3ekFsgshgMorRBOYuMexHPdCoprMh ZRasjM7AhvEpxI5lNVTF8yE5qzQZkst3YUKRtqNgfagHzWWwRPS5J4Pb3s6RulxmMnlr7Hg/0qb U5RR9IDsPIadEcLxTYnTgInMT/MTjU+eDlyhC7Yn2bPN83eg== X-Received: by 2002:a17:90a:d44b:b0:37c:7090:821b with SMTP id 98e67ed59e1d1-380aa0f436amr1235947a91.10.1782909065079; Wed, 01 Jul 2026 05:31:05 -0700 (PDT) Received: from L6YN4KR4K9.bytedance.net ([139.177.225.232]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ca4bae1e2asm25166825ad.73.2026.07.01.05.30.48 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Wed, 01 Jul 2026 05:31:04 -0700 (PDT) From: Yunhui Cui To: pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, dennis@kernel.org, tj@kernel.org, cl@gentwo.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, memxor@gmail.com, song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, bjorn@kernel.org, pulehui@huawei.com, puranjay@kernel.org, thuth@redhat.com, ajones@ventanamicro.com, ben.dooks@codethink.co.uk, rkrcmar@ventanamicro.com, cuiyunhui@bytedance.com, samuel.holland@sifive.com, zong.li@sifive.com, conor.dooley@microchip.com, tglx@kernel.org, debug@rivosinc.com, seanwascoding@gmail.com, andybnac@gmail.com, menglong8.dong@gmail.com, cyrilbur@tenstorrent.com, wangruikang@iscas.ac.cn, atishp@rivosinc.com, apatel@ventanamicro.com, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, bpf@vger.kernel.org, arnd@arndb.de, nathan@kernel.org, nick.desaulniers+lkml@gmail.com, morbo@google.com, justinstitt@google.com, qingfang.deng@siflower.com.cn, linux-arch@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH v6 2/3] riscv: introduce percpu.h into include/asm Date: Wed, 1 Jul 2026 20:29:47 +0800 Message-Id: <20260701122948.57584-3-cuiyunhui@bytedance.com> X-Mailer: git-send-email 2.39.2 (Apple Git-143) In-Reply-To: <20260701122948.57584-1-cuiyunhui@bytedance.com> References: <20260701122948.57584-1-cuiyunhui@bytedance.com> Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add RISC-V specific this_cpu helpers so common percpu operations can use short architecture sequences instead of the generic implementation. Native-width operations use AMOs, while 8/16-bit operations use Zabha when available and a local 32-bit LR/SC fallback otherwise. Signed-off-by: Yunhui Cui --- arch/riscv/include/asm/percpu.h | 284 ++++++++++++++++++++++++++++++++ 1 file changed, 284 insertions(+) create mode 100644 arch/riscv/include/asm/percpu.h diff --git a/arch/riscv/include/asm/percpu.h b/arch/riscv/include/asm/percpu.h new file mode 100644 index 0000000000000..34483253e946f --- /dev/null +++ b/arch/riscv/include/asm/percpu.h @@ -0,0 +1,284 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#ifndef __ASM_PERCPU_H +#define __ASM_PERCPU_H + +#include +#include + +#include +#include +#include +#include + +#define PERCPU_RW_OPS(sz) \ +static inline unsigned long __percpu_read_##sz(void *ptr) \ +{ \ + return READ_ONCE(*(u##sz *)ptr); \ +} \ + \ +static inline void __percpu_write_##sz(void *ptr, unsigned long val) \ +{ \ + WRITE_ONCE(*(u##sz *)ptr, (u##sz)val); \ +} + +PERCPU_RW_OPS(8) +PERCPU_RW_OPS(16) +PERCPU_RW_OPS(32) + +#ifdef CONFIG_64BIT +PERCPU_RW_OPS(64) +#endif + +#define __PERCPU_AMO_OP_CASE(sfx, name, sz, amo_insn) \ +static inline void \ +__percpu_##name##_amo_case_##sz(void *ptr, unsigned long val) \ +{ \ + asm volatile ( \ + "amo" #amo_insn #sfx " zero, %[val], %[ptr]" \ + : [ptr] "+A" (*(u##sz *)ptr) \ + : [val] "r" ((u##sz)(val)) \ + : "memory"); \ +} + +#ifdef CONFIG_64BIT +#define PERCPU_OP(name, amo_insn) \ + __PERCPU_AMO_OP_CASE(.w, name, 32, amo_insn) \ + __PERCPU_AMO_OP_CASE(.d, name, 64, amo_insn) +#else +#define PERCPU_OP(name, amo_insn) \ + __PERCPU_AMO_OP_CASE(.w, name, 32, amo_insn) +#endif + +PERCPU_OP(add, add) +PERCPU_OP(andnot, and) +PERCPU_OP(or, or) + +/* + * Currently, only this_cpu_add_return_xxx() requires a return value, + * and the PERCPU_RET_OP() does not account for other operations. + */ +#define __PERCPU_AMO_RET_OP_CASE(sfx, name, sz, amo_insn) \ +static inline u##sz \ +__percpu_##name##_return_amo_case_##sz(void *ptr, unsigned long val) \ +{ \ + register u##sz ret; \ + \ + asm volatile ( \ + "amo" #amo_insn #sfx " %[ret], %[val], %[ptr]" \ + : [ptr] "+A" (*(u##sz *)ptr), [ret] "=r" (ret) \ + : [val] "r" ((u##sz)(val)) \ + : "memory"); \ + \ + return ret + val; \ +} + +#ifdef CONFIG_64BIT +#define PERCPU_RET_OP(name, amo_insn) \ + __PERCPU_AMO_RET_OP_CASE(.w, name, 32, amo_insn) \ + __PERCPU_AMO_RET_OP_CASE(.d, name, 64, amo_insn) +#else +#define PERCPU_RET_OP(name, amo_insn) \ + __PERCPU_AMO_RET_OP_CASE(.w, name, 32, amo_insn) +#endif + +PERCPU_RET_OP(add, add) + +#define PERCPU_8_16_GET_SHIFT(ptr) (((unsigned long)(ptr) & 0x3) * BITS_PER_BYTE) +#define PERCPU_8_16_GET_MASK(sz) GENMASK((sz) - 1, 0) +#define PERCPU_8_16_GET_PTR32(ptr) ((u32 *)((unsigned long)(ptr) & ~0x3)) + +#define PERCPU_8_16_OP(name, amo_insn, sz, sfx, val_type, new_val_expr, asm_op) \ +static inline void __percpu_##name##_amo_case_##sz(void *ptr, unsigned long val) \ +{ \ + if (IS_ENABLED(CONFIG_RISCV_ISA_ZABHA) && \ + riscv_has_extension_unlikely(RISCV_ISA_EXT_ZABHA)) { \ + asm volatile ("amo" #amo_insn #sfx " zero, %[val], %[ptr]" \ + : [ptr] "+A"(*(val_type *)ptr) \ + : [val] "r"((val_type)((new_val_expr) & PERCPU_8_16_GET_MASK(sz))) \ + : "memory"); \ + } else { \ + u32 *ptr32 = PERCPU_8_16_GET_PTR32(ptr); \ + const unsigned long shift = PERCPU_8_16_GET_SHIFT(ptr); \ + const u32 mask = PERCPU_8_16_GET_MASK(sz) << shift; \ + const val_type val_trunc = (val_type)((new_val_expr) \ + & PERCPU_8_16_GET_MASK(sz)); \ + u32 old, new; \ + val_type field; \ + \ + asm volatile ( \ + "0: lr.w %0, %2\n" \ + "and %3, %0, %4\n" \ + "srl %3, %3, %5\n" \ + #asm_op " %3, %3, %6\n" \ + "and %3, %3, %8\n" \ + "sll %3, %3, %5\n" \ + "and %1, %0, %7\n" \ + "or %1, %1, %3\n" \ + "sc.w %1, %1, %2\n" \ + "bnez %1, 0b\n" \ + : "=&r"(old), "=&r"(new), "+A"(*ptr32), "=&r"(field) \ + : "r"(mask), "r"(shift), "r"(val_trunc), "r"(~mask), \ + "r"(PERCPU_8_16_GET_MASK(sz)) \ + : "memory"); \ + } \ +} + +#define PERCPU_OP_8_16(op_name, op, expr, final_op) \ + PERCPU_8_16_OP(op_name, op, 8, .b, u8, expr, final_op); \ + PERCPU_8_16_OP(op_name, op, 16, .h, u16, expr, final_op) + +PERCPU_OP_8_16(add, add, val, add) +PERCPU_OP_8_16(andnot, and, ~(val), and) +PERCPU_OP_8_16(or, or, val, or) + +#define PERCPU_8_16_RET_OP(name, amo_insn, sz, sfx, val_type, new_val_expr) \ +static inline val_type __percpu_##name##_return_amo_case_##sz(void *ptr, unsigned long val) \ +{ \ + if (IS_ENABLED(CONFIG_RISCV_ISA_ZABHA) && \ + riscv_has_extension_unlikely(RISCV_ISA_EXT_ZABHA)) { \ + register val_type ret; \ + asm volatile ("amo" #amo_insn #sfx " %[ret], %[val], %[ptr]" \ + : [ptr] "+A"(*(val_type *)ptr), [ret] "=r"(ret) \ + : [val] "r"((val_type)((new_val_expr) & PERCPU_8_16_GET_MASK(sz))) \ + : "memory"); \ + return ret + (val_type)((new_val_expr) & PERCPU_8_16_GET_MASK(sz)); \ + } else { \ + u32 *ptr32 = PERCPU_8_16_GET_PTR32(ptr); \ + const unsigned long shift = PERCPU_8_16_GET_SHIFT(ptr); \ + const u32 mask = (PERCPU_8_16_GET_MASK(sz) << shift); \ + const u32 inv_mask = ~mask; \ + const val_type val_trunc = (val_type)((new_val_expr) \ + & PERCPU_8_16_GET_MASK(sz)); \ + u32 old, new, field; \ + \ + asm volatile ( \ + "0: lr.w %0, %3\n" \ + "and %1, %0, %4\n" \ + "srl %1, %1, %5\n" \ + "add %1, %1, %6\n" \ + "and %1, %1, %7\n" \ + "sll %1, %1, %5\n" \ + "and %2, %0, %8\n" \ + "or %2, %2, %1\n" \ + "sc.w %2, %2, %3\n" \ + "bnez %2, 0b\n" \ + : "=&r"(old), "=&r"(field), "=&r"(new), "+A"(*ptr32) \ + : "r"(mask), "r"(shift), "r"(val_trunc), "r"(PERCPU_8_16_GET_MASK(sz)), \ + "r"(inv_mask) \ + : "memory"); \ + return (val_type)(field >> shift); \ + } \ +} + +PERCPU_8_16_RET_OP(add, add, 8, .b, u8, val) +PERCPU_8_16_RET_OP(add, add, 16, .h, u16, val) + +#define _pcp_protect(op, pcp, ...) \ +({ \ + preempt_disable_notrace(); \ + op(raw_cpu_ptr(&(pcp)), __VA_ARGS__); \ + preempt_enable_notrace(); \ +}) + +#define _pcp_protect_return(op, pcp, args...) \ +({ \ + typeof(pcp) __retval; \ + preempt_disable_notrace(); \ + __retval = (typeof(pcp))op(raw_cpu_ptr(&(pcp)), ##args); \ + preempt_enable_notrace(); \ + __retval; \ +}) + +#define this_cpu_read_1(pcp) _pcp_protect_return(__percpu_read_8, pcp) +#define this_cpu_read_2(pcp) _pcp_protect_return(__percpu_read_16, pcp) +#define this_cpu_read_4(pcp) _pcp_protect_return(__percpu_read_32, pcp) + +#ifdef CONFIG_64BIT +#define this_cpu_read_8(pcp) _pcp_protect_return(__percpu_read_64, pcp) +#endif + +#define this_cpu_write_1(pcp, val) _pcp_protect(__percpu_write_8, pcp, (unsigned long)val) +#define this_cpu_write_2(pcp, val) _pcp_protect(__percpu_write_16, pcp, (unsigned long)val) +#define this_cpu_write_4(pcp, val) _pcp_protect(__percpu_write_32, pcp, (unsigned long)val) + +#ifdef CONFIG_64BIT +#define this_cpu_write_8(pcp, val) _pcp_protect(__percpu_write_64, pcp, (unsigned long)val) +#endif + +#define this_cpu_add_1(pcp, val) _pcp_protect(__percpu_add_amo_case_8, pcp, val) +#define this_cpu_add_2(pcp, val) _pcp_protect(__percpu_add_amo_case_16, pcp, val) +#define this_cpu_add_4(pcp, val) _pcp_protect(__percpu_add_amo_case_32, pcp, val) + +#ifdef CONFIG_64BIT +#define this_cpu_add_8(pcp, val) _pcp_protect(__percpu_add_amo_case_64, pcp, val) +#endif + +#define this_cpu_add_return_1(pcp, val) \ +_pcp_protect_return(__percpu_add_return_amo_case_8, pcp, val) + +#define this_cpu_add_return_2(pcp, val) \ +_pcp_protect_return(__percpu_add_return_amo_case_16, pcp, val) + +#define this_cpu_add_return_4(pcp, val) \ +_pcp_protect_return(__percpu_add_return_amo_case_32, pcp, val) + +#ifdef CONFIG_64BIT +#define this_cpu_add_return_8(pcp, val) \ +_pcp_protect_return(__percpu_add_return_amo_case_64, pcp, val) +#endif + +#define this_cpu_and_1(pcp, val) _pcp_protect(__percpu_andnot_amo_case_8, pcp, ~(val)) +#define this_cpu_and_2(pcp, val) _pcp_protect(__percpu_andnot_amo_case_16, pcp, ~(val)) +#define this_cpu_and_4(pcp, val) _pcp_protect(__percpu_andnot_amo_case_32, pcp, val) + +#ifdef CONFIG_64BIT +#define this_cpu_and_8(pcp, val) _pcp_protect(__percpu_andnot_amo_case_64, pcp, val) +#endif + +#define this_cpu_or_1(pcp, val) _pcp_protect(__percpu_or_amo_case_8, pcp, val) +#define this_cpu_or_2(pcp, val) _pcp_protect(__percpu_or_amo_case_16, pcp, val) +#define this_cpu_or_4(pcp, val) _pcp_protect(__percpu_or_amo_case_32, pcp, val) + +#ifdef CONFIG_64BIT +#define this_cpu_or_8(pcp, val) _pcp_protect(__percpu_or_amo_case_64, pcp, val) +#endif + +#define this_cpu_xchg_1(pcp, val) _pcp_protect_return(xchg_relaxed, pcp, val) +#define this_cpu_xchg_2(pcp, val) _pcp_protect_return(xchg_relaxed, pcp, val) +#define this_cpu_xchg_4(pcp, val) _pcp_protect_return(xchg_relaxed, pcp, val) + +#ifdef CONFIG_64BIT +#define this_cpu_xchg_8(pcp, val) _pcp_protect_return(xchg_relaxed, pcp, val) +#endif + +#define this_cpu_cmpxchg_1(pcp, o, n) _pcp_protect_return(cmpxchg_relaxed, pcp, o, n) +#define this_cpu_cmpxchg_2(pcp, o, n) _pcp_protect_return(cmpxchg_relaxed, pcp, o, n) +#define this_cpu_cmpxchg_4(pcp, o, n) _pcp_protect_return(cmpxchg_relaxed, pcp, o, n) + +#ifdef CONFIG_64BIT +#define this_cpu_cmpxchg_8(pcp, o, n) _pcp_protect_return(cmpxchg_relaxed, pcp, o, n) + +#define this_cpu_cmpxchg64(pcp, o, n) this_cpu_cmpxchg_8(pcp, o, n) +#endif + +#ifdef system_has_cmpxchg128 +#define this_cpu_cmpxchg128(pcp, o, n) \ +({ \ + u128 ret__; \ + typeof(pcp) *ptr__; \ + \ + preempt_disable_notrace(); \ + ptr__ = raw_cpu_ptr(&(pcp)); \ + if (system_has_cmpxchg128()) \ + ret__ = cmpxchg128_local(ptr__, (o), (n)); \ + else \ + ret__ = this_cpu_generic_cmpxchg(pcp, (o), (n)); \ + preempt_enable_notrace(); \ + ret__; \ +}) +#endif + +#include + +#endif /* __ASM_PERCPU_H */ -- 2.39.5