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Fri, 20 May 2022 18:55:13 -0700 (PDT) MIME-Version: 1.0 References: <20220518092619.1269111-1-chenhuacai@loongson.cn> <20220518092619.1269111-8-chenhuacai@loongson.cn> In-Reply-To: From: Huacai Chen Date: Sat, 21 May 2022 09:55:06 +0800 Message-ID: Subject: Re: [PATCH V11 07/22] LoongArch: Add atomic/locking headers To: Guo Ren Cc: Huacai Chen , Arnd Bergmann , Andy Lutomirski , Thomas Gleixner , Peter Zijlstra , Andrew Morton , David Airlie , Jonathan Corbet , Linus Torvalds , linux-arch , Linux Doc Mailing List , Linux Kernel Mailing List , Xuefeng Li , Yanteng Si , Xuerui Wang , Jiaxun Yang , Stephen Rothwell Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Ren, On Sat, May 21, 2022 at 2:15 AM Guo Ren wrote: > > On Fri, May 20, 2022 at 5:50 PM Huacai Chen wrote: > > > > Hi, Ren, > > > > On Fri, May 20, 2022 at 3:54 PM Guo Ren wrote: > > > > > > On Wed, May 18, 2022 at 5:34 PM Huacai Chen wrote: > > > > > > > > Add common headers (atomic, bitops, barrier and locking) for basic > > > > LoongArch support. > > > > > > > > Signed-off-by: Huacai Chen > > > > --- > > > > arch/loongarch/include/asm/atomic.h | 358 +++++++++++++++++++++++++++ > > > > arch/loongarch/include/asm/barrier.h | 51 ++++ > > > > arch/loongarch/include/asm/bitops.h | 33 +++ > > > > arch/loongarch/include/asm/bitrev.h | 34 +++ > > > > arch/loongarch/include/asm/cmpxchg.h | 121 +++++++++ > > > > arch/loongarch/include/asm/local.h | 138 +++++++++++ > > > > arch/loongarch/include/asm/percpu.h | 20 ++ > > > > 7 files changed, 755 insertions(+) > > > > create mode 100644 arch/loongarch/include/asm/atomic.h > > > > create mode 100644 arch/loongarch/include/asm/barrier.h > > > > create mode 100644 arch/loongarch/include/asm/bitops.h > > > > create mode 100644 arch/loongarch/include/asm/bitrev.h > > > > create mode 100644 arch/loongarch/include/asm/cmpxchg.h > > > > create mode 100644 arch/loongarch/include/asm/local.h > > > > create mode 100644 arch/loongarch/include/asm/percpu.h > > > > > > > > diff --git a/arch/loongarch/include/asm/atomic.h b/arch/loongarch/include/asm/atomic.h > > > > new file mode 100644 > > > > index 000000000000..932352342b12 > > > > --- /dev/null > > > > +++ b/arch/loongarch/include/asm/atomic.h > > > > @@ -0,0 +1,358 @@ > > > > +/* SPDX-License-Identifier: GPL-2.0 */ > > > > +/* > > > > + * Atomic operations. > > > > + * > > > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > > > + */ > > > > +#ifndef _ASM_ATOMIC_H > > > > +#define _ASM_ATOMIC_H > > > > + > > > > +#include > > > > +#include > > > > +#include > > > > +#include > > > > + > > > > +#if __SIZEOF_LONG__ == 4 > > > > +#define __LL "ll.w " > > > > +#define __SC "sc.w " > > > > +#define __AMADD "amadd.w " > > > > +#define __AMAND_DB "amand_db.w " > > > > +#define __AMOR_DB "amor_db.w " > > > > +#define __AMXOR_DB "amxor_db.w " > > > > +#elif __SIZEOF_LONG__ == 8 > > > > +#define __LL "ll.d " > > > > +#define __SC "sc.d " > > > > +#define __AMADD "amadd.d " > > > > +#define __AMAND_DB "amand_db.d " > > > > +#define __AMOR_DB "amor_db.d " > > > > +#define __AMXOR_DB "amxor_db.d " > > > > +#endif > > > > + > > > > +#define ATOMIC_INIT(i) { (i) } > > > > + > > > > +/* > > > > + * arch_atomic_read - read atomic variable > > > > + * @v: pointer of type atomic_t > > > > + * > > > > + * Atomically reads the value of @v. > > > > + */ > > > > +#define arch_atomic_read(v) READ_ONCE((v)->counter) > > > > + > > > > +/* > > > > + * arch_atomic_set - set atomic variable > > > > + * @v: pointer of type atomic_t > > > > + * @i: required value > > > > + * > > > > + * Atomically sets the value of @v to @i. > > > > + */ > > > > +#define arch_atomic_set(v, i) WRITE_ONCE((v)->counter, (i)) > > > > + > > > > +#define ATOMIC_OP(op, I, asm_op) \ > > > > +static inline void arch_atomic_##op(int i, atomic_t *v) \ > > > > +{ \ > > > > + __asm__ __volatile__( \ > > > > + "am"#asm_op"_db.w" " $zero, %1, %0 \n" \ > > > > + : "+ZB" (v->counter) \ > > > > + : "r" (I) \ > > > > + : "memory"); \ > > > > +} > > > > + > > > > +#define ATOMIC_OP_RETURN(op, I, asm_op, c_op) \ > > > > +static inline int arch_atomic_##op##_return_relaxed(int i, atomic_t *v) \ > > > > +{ \ > > > > + int result; \ > > > > + \ > > > > + __asm__ __volatile__( \ > > > > + "am"#asm_op"_db.w" " %1, %2, %0 \n" \ > > > > + : "+ZB" (v->counter), "=&r" (result) \ > > > > + : "r" (I) \ > > > > + : "memory"); \ > > > > + \ > > > > + return result c_op I; \ > > > > +} > > > > + > > > > +#define ATOMIC_FETCH_OP(op, I, asm_op) \ > > > > +static inline int arch_atomic_fetch_##op##_relaxed(int i, atomic_t *v) \ > > > > +{ \ > > > > + int result; \ > > > > + \ > > > > + __asm__ __volatile__( \ > > > > + "am"#asm_op"_db.w" " %1, %2, %0 \n" \ > > > > + : "+ZB" (v->counter), "=&r" (result) \ > > > > + : "r" (I) \ > > > > + : "memory"); \ > > > > + \ > > > > + return result; \ > > > > +} > > > > + > > > > +#define ATOMIC_OPS(op, I, asm_op, c_op) \ > > > > + ATOMIC_OP(op, I, asm_op) \ > > > > + ATOMIC_OP_RETURN(op, I, asm_op, c_op) \ > > > > + ATOMIC_FETCH_OP(op, I, asm_op) > > > > + > > > > +ATOMIC_OPS(add, i, add, +) > > > > +ATOMIC_OPS(sub, -i, add, +) > > > > + > > > > +#define arch_atomic_add_return_relaxed arch_atomic_add_return_relaxed > > > > +#define arch_atomic_sub_return_relaxed arch_atomic_sub_return_relaxed > > > > +#define arch_atomic_fetch_add_relaxed arch_atomic_fetch_add_relaxed > > > > +#define arch_atomic_fetch_sub_relaxed arch_atomic_fetch_sub_relaxed > > > > + > > > > +#undef ATOMIC_OPS > > > > + > > > > +#define ATOMIC_OPS(op, I, asm_op) \ > > > > + ATOMIC_OP(op, I, asm_op) \ > > > > + ATOMIC_FETCH_OP(op, I, asm_op) > > > > + > > > > +ATOMIC_OPS(and, i, and) > > > > +ATOMIC_OPS(or, i, or) > > > > +ATOMIC_OPS(xor, i, xor) > > > > + > > > > +#define arch_atomic_fetch_and_relaxed arch_atomic_fetch_and_relaxed > > > > +#define arch_atomic_fetch_or_relaxed arch_atomic_fetch_or_relaxed > > > > +#define arch_atomic_fetch_xor_relaxed arch_atomic_fetch_xor_relaxed > > > > + > > > > +#undef ATOMIC_OPS > > > > +#undef ATOMIC_FETCH_OP > > > > +#undef ATOMIC_OP_RETURN > > > > +#undef ATOMIC_OP > > > > + > > > > +static inline int arch_atomic_fetch_add_unless(atomic_t *v, int a, int u) > > > > +{ > > > > + int prev, rc; > > > > + > > > > + __asm__ __volatile__ ( > > > We need __WEAK_LLSC_MB here, to prevent previous access after sc.w. > > LoongArch's ll and sc has implied memory barrier. :) > > But why do you put __WEAK_LLSC_MB after sc ? We don't need a barrier before ll, and don't need a barrier after sc, but we need a barrier when the code goes out of the ll-sc region. Huacai > > > > > > > > > > + "0: ll.w %[p], %[c]\n" > > > > + " beq %[p], %[u], 1f\n" > > > > + " add.w %[rc], %[p], %[a]\n" > > > > + " sc.w %[rc], %[c]\n" > > > > + " beqz %[rc], 0b\n" > > > > + " b 2f\n" > > > > + "1:\n" > > > > + __WEAK_LLSC_MB > > > > + "2:\n" > > > > + : [p]"=&r" (prev), [rc]"=&r" (rc), > > > > + [c]"=ZB" (v->counter) > > > > + : [a]"r" (a), [u]"r" (u) > > > > + : "memory"); > > > > + > > > > + return prev; > > > > +} > > > > +#define arch_atomic_fetch_add_unless arch_atomic_fetch_add_unless > > > > + > > > > +/* > > > > + * arch_atomic_sub_if_positive - conditionally subtract integer from atomic variable > > > > + * @i: integer value to subtract > > > > + * @v: pointer of type atomic_t > > > > + * > > > > + * Atomically test @v and subtract @i if @v is greater or equal than @i. > > > > + * The function returns the old value of @v minus @i. > > > > + */ > > > > +static inline int arch_atomic_sub_if_positive(int i, atomic_t *v) > > > > +{ > > > > + int result; > > > > + int temp; > > > > + > > > > + if (__builtin_constant_p(i)) { > > > > + __asm__ __volatile__( > > > Ditto. > > > > + "1: ll.w %1, %2 # atomic_sub_if_positive\n" > > > > + " addi.w %0, %1, %3 \n" > > > > + " or %1, %0, $zero \n" > > > > + " blt %0, $zero, 2f \n" > > > > + " sc.w %1, %2 \n" > > > > + " beq $zero, %1, 1b \n" > > > Need __WEAK_LLSC_MB ? > > > > + "2: \n" > > > > + : "=&r" (result), "=&r" (temp), > > > > + "+" GCC_OFF_SMALL_ASM() (v->counter) > > > > + : "I" (-i)); > > > > + } else { > > > > + __asm__ __volatile__( > > > Ditto. > > > > + "1: ll.w %1, %2 # atomic_sub_if_positive\n" > > > > + " sub.w %0, %1, %3 \n" > > > > + " or %1, %0, $zero \n" > > > > + " blt %0, $zero, 2f \n" > > > > + " sc.w %1, %2 \n" > > > Need __WEAK_LLSC_MB ? > > > > + " beq $zero, %1, 1b \n" > > > > + "2: \n" > > > > + : "=&r" (result), "=&r" (temp), > > > > + "+" GCC_OFF_SMALL_ASM() (v->counter) > > > > + : "r" (i)); > > > > + } > > > > + > > > > + return result; > > > > +} > > > > + > > > > +#define arch_atomic_cmpxchg(v, o, n) (arch_cmpxchg(&((v)->counter), (o), (n))) > > > > +#define arch_atomic_xchg(v, new) (arch_xchg(&((v)->counter), (new))) > > > > + > > > > +/* > > > > + * arch_atomic_dec_if_positive - decrement by 1 if old value positive > > > > + * @v: pointer of type atomic_t > > > > + */ > > > > +#define arch_atomic_dec_if_positive(v) arch_atomic_sub_if_positive(1, v) > > > > + > > > > +#ifdef CONFIG_64BIT > > > > + > > > > +#define ATOMIC64_INIT(i) { (i) } > > > > + > > > > +/* > > > > + * arch_atomic64_read - read atomic variable > > > > + * @v: pointer of type atomic64_t > > > > + * > > > > + */ > > > > +#define arch_atomic64_read(v) READ_ONCE((v)->counter) > > > > + > > > > +/* > > > > + * arch_atomic64_set - set atomic variable > > > > + * @v: pointer of type atomic64_t > > > > + * @i: required value > > > > + */ > > > > +#define arch_atomic64_set(v, i) WRITE_ONCE((v)->counter, (i)) > > > > + > > > > +#define ATOMIC64_OP(op, I, asm_op) \ > > > > +static inline void arch_atomic64_##op(long i, atomic64_t *v) \ > > > > +{ \ > > > > + __asm__ __volatile__( \ > > > > + "am"#asm_op"_db.d " " $zero, %1, %0 \n" \ > > > > + : "+ZB" (v->counter) \ > > > > + : "r" (I) \ > > > > + : "memory"); \ > > > > +} > > > > + > > > > +#define ATOMIC64_OP_RETURN(op, I, asm_op, c_op) \ > > > > +static inline long arch_atomic64_##op##_return_relaxed(long i, atomic64_t *v) \ > > > > +{ \ > > > > + long result; \ > > > > + __asm__ __volatile__( \ > > > > + "am"#asm_op"_db.d " " %1, %2, %0 \n" \ > > > > + : "+ZB" (v->counter), "=&r" (result) \ > > > > + : "r" (I) \ > > > > + : "memory"); \ > > > > + \ > > > > + return result c_op I; \ > > > > +} > > > > + > > > > +#define ATOMIC64_FETCH_OP(op, I, asm_op) \ > > > > +static inline long arch_atomic64_fetch_##op##_relaxed(long i, atomic64_t *v) \ > > > > +{ \ > > > > + long result; \ > > > > + \ > > > > + __asm__ __volatile__( \ > > > > + "am"#asm_op"_db.d " " %1, %2, %0 \n" \ > > > > + : "+ZB" (v->counter), "=&r" (result) \ > > > > + : "r" (I) \ > > > > + : "memory"); \ > > > > + \ > > > > + return result; \ > > > > +} > > > > + > > > > +#define ATOMIC64_OPS(op, I, asm_op, c_op) \ > > > > + ATOMIC64_OP(op, I, asm_op) \ > > > > + ATOMIC64_OP_RETURN(op, I, asm_op, c_op) \ > > > > + ATOMIC64_FETCH_OP(op, I, asm_op) > > > > + > > > > +ATOMIC64_OPS(add, i, add, +) > > > > +ATOMIC64_OPS(sub, -i, add, +) > > > > + > > > > +#define arch_atomic64_add_return_relaxed arch_atomic64_add_return_relaxed > > > > +#define arch_atomic64_sub_return_relaxed arch_atomic64_sub_return_relaxed > > > > +#define arch_atomic64_fetch_add_relaxed arch_atomic64_fetch_add_relaxed > > > > +#define arch_atomic64_fetch_sub_relaxed arch_atomic64_fetch_sub_relaxed > > > > + > > > > +#undef ATOMIC64_OPS > > > > + > > > > +#define ATOMIC64_OPS(op, I, asm_op) \ > > > > + ATOMIC64_OP(op, I, asm_op) \ > > > > + ATOMIC64_FETCH_OP(op, I, asm_op) > > > > + > > > > +ATOMIC64_OPS(and, i, and) > > > > +ATOMIC64_OPS(or, i, or) > > > > +ATOMIC64_OPS(xor, i, xor) > > > > + > > > > +#define arch_atomic64_fetch_and_relaxed arch_atomic64_fetch_and_relaxed > > > > +#define arch_atomic64_fetch_or_relaxed arch_atomic64_fetch_or_relaxed > > > > +#define arch_atomic64_fetch_xor_relaxed arch_atomic64_fetch_xor_relaxed > > > > + > > > > +#undef ATOMIC64_OPS > > > > +#undef ATOMIC64_FETCH_OP > > > > +#undef ATOMIC64_OP_RETURN > > > > +#undef ATOMIC64_OP > > > > + > > > > +static inline long arch_atomic64_fetch_add_unless(atomic64_t *v, long a, long u) > > > > +{ > > > > + long prev, rc; > > > > + > > > > + __asm__ __volatile__ ( > > > Ditto > > > > + "0: ll.d %[p], %[c]\n" > > > > + " beq %[p], %[u], 1f\n" > > > > + " add.d %[rc], %[p], %[a]\n" > > > > + " sc.d %[rc], %[c]\n" > > > > + " beqz %[rc], 0b\n" > > > Ditto > > > > + " b 2f\n" > > > > + "1:\n" > > > > + __WEAK_LLSC_MB > > > > + "2:\n" > > > > + : [p]"=&r" (prev), [rc]"=&r" (rc), > > > > + [c] "=ZB" (v->counter) > > > > + : [a]"r" (a), [u]"r" (u) > > > > + : "memory"); > > > > + > > > > + return prev; > > > > +} > > > > +#define arch_atomic64_fetch_add_unless arch_atomic64_fetch_add_unless > > > > + > > > > +/* > > > > + * arch_atomic64_sub_if_positive - conditionally subtract integer from atomic variable > > > > + * @i: integer value to subtract > > > > + * @v: pointer of type atomic64_t > > > > + * > > > > + * Atomically test @v and subtract @i if @v is greater or equal than @i. > > > > + * The function returns the old value of @v minus @i. > > > > + */ > > > > +static inline long arch_atomic64_sub_if_positive(long i, atomic64_t *v) > > > > +{ > > > > + long result; > > > > + long temp; > > > > + > > > > + if (__builtin_constant_p(i)) { > > > > + __asm__ __volatile__( > > > Ditto > > > > + "1: ll.d %1, %2 # atomic64_sub_if_positive \n" > > > > + " addi.d %0, %1, %3 \n" > > > > + " or %1, %0, $zero \n" > > > > + " blt %0, $zero, 2f \n" > > > > + " sc.d %1, %2 \n" > > > Ditto > > > > + " beq %1, $zero, 1b \n" > > > > + "2: \n" > > > > + : "=&r" (result), "=&r" (temp), > > > > + "+" GCC_OFF_SMALL_ASM() (v->counter) > > > > + : "I" (-i)); > > > > + } else { > > > > + __asm__ __volatile__( > > > Ditto > > > > + "1: ll.d %1, %2 # atomic64_sub_if_positive \n" > > > > + " sub.d %0, %1, %3 \n" > > > > + " or %1, %0, $zero \n" > > > > + " blt %0, $zero, 2f \n" > > > > + " sc.d %1, %2 \n" > > > Ditto > > > > + " beq %1, $zero, 1b \n" > > > > + "2: \n" > > > > + : "=&r" (result), "=&r" (temp), > > > > + "+" GCC_OFF_SMALL_ASM() (v->counter) > > > > + : "r" (i)); > > > > + } > > > > + > > > > + return result; > > > > +} > > > > + > > > > +#define arch_atomic64_cmpxchg(v, o, n) \ > > > > + ((__typeof__((v)->counter))arch_cmpxchg(&((v)->counter), (o), (n))) > > > > +#define arch_atomic64_xchg(v, new) (arch_xchg(&((v)->counter), (new))) > > > > + > > > > +/* > > > > + * arch_atomic64_dec_if_positive - decrement by 1 if old value positive > > > > + * @v: pointer of type atomic64_t > > > > + */ > > > > +#define arch_atomic64_dec_if_positive(v) arch_atomic64_sub_if_positive(1, v) > > > > + > > > > +#endif /* CONFIG_64BIT */ > > > > + > > > > +#endif /* _ASM_ATOMIC_H */ > > > > diff --git a/arch/loongarch/include/asm/barrier.h b/arch/loongarch/include/asm/barrier.h > > > > new file mode 100644 > > > > index 000000000000..e57571bcaf4f > > > > --- /dev/null > > > > +++ b/arch/loongarch/include/asm/barrier.h > > > > @@ -0,0 +1,51 @@ > > > > +/* SPDX-License-Identifier: GPL-2.0 */ > > > > +/* > > > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > > > + */ > > > > +#ifndef __ASM_BARRIER_H > > > > +#define __ASM_BARRIER_H > > > > + > > > > +#define __sync() __asm__ __volatile__("dbar 0" : : : "memory") > > > > + > > > > +#define fast_wmb() __sync() > > > > +#define fast_rmb() __sync() > > > > +#define fast_mb() __sync() > > > > +#define fast_iob() __sync() > > > > +#define wbflush() __sync() > > > > + > > > > +#define wmb() fast_wmb() > > > > +#define rmb() fast_rmb() > > > > +#define mb() fast_mb() > > > > +#define iob() fast_iob() > > > > + > > > > +/** > > > > + * array_index_mask_nospec() - generate a ~0 mask when index < size, 0 otherwise > > > > + * @index: array element index > > > > + * @size: number of elements in array > > > > + * > > > > + * Returns: > > > > + * 0 - (@index < @size) > > > > + */ > > > > +#define array_index_mask_nospec array_index_mask_nospec > > > > +static inline unsigned long array_index_mask_nospec(unsigned long index, > > > > + unsigned long size) > > > > +{ > > > > + unsigned long mask; > > > > + > > > > + __asm__ __volatile__( > > > > + "sltu %0, %1, %2\n\t" > > > > +#if (__SIZEOF_LONG__ == 4) > > > > + "sub.w %0, $r0, %0\n\t" > > > > +#elif (__SIZEOF_LONG__ == 8) > > > > + "sub.d %0, $r0, %0\n\t" > > > > +#endif > > > > + : "=r" (mask) > > > > + : "r" (index), "r" (size) > > > > + :); > > > > + > > > > + return mask; > > > > +} > > > > + > > > > +#include > > > > + > > > > +#endif /* __ASM_BARRIER_H */ > > > > diff --git a/arch/loongarch/include/asm/bitops.h b/arch/loongarch/include/asm/bitops.h > > > > new file mode 100644 > > > > index 000000000000..69e00f8d8034 > > > > --- /dev/null > > > > +++ b/arch/loongarch/include/asm/bitops.h > > > > @@ -0,0 +1,33 @@ > > > > +/* SPDX-License-Identifier: GPL-2.0 */ > > > > +/* > > > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > > > + */ > > > > +#ifndef _ASM_BITOPS_H > > > > +#define _ASM_BITOPS_H > > > > + > > > > +#include > > > > + > > > > +#ifndef _LINUX_BITOPS_H > > > > +#error only can be included directly > > > > +#endif > > > > + > > > > +#include > > > > + > > > > +#include > > > > +#include > > > > +#include > > > > +#include > > > > + > > > > +#include > > > > +#include > > > > + > > > > +#include > > > > +#include > > > > + > > > > +#include > > > > +#include > > > > +#include > > > > +#include > > > > +#include > > > > + > > > > +#endif /* _ASM_BITOPS_H */ > > > > diff --git a/arch/loongarch/include/asm/bitrev.h b/arch/loongarch/include/asm/bitrev.h > > > > new file mode 100644 > > > > index 000000000000..46f275b9cdf7 > > > > --- /dev/null > > > > +++ b/arch/loongarch/include/asm/bitrev.h > > > > @@ -0,0 +1,34 @@ > > > > +/* SPDX-License-Identifier: GPL-2.0 */ > > > > +/* > > > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > > > + */ > > > > +#ifndef __LOONGARCH_ASM_BITREV_H__ > > > > +#define __LOONGARCH_ASM_BITREV_H__ > > > > + > > > > +#include > > > > + > > > > +static __always_inline __attribute_const__ u32 __arch_bitrev32(u32 x) > > > > +{ > > > > + u32 ret; > > > > + > > > > + asm("bitrev.4b %0, %1" : "=r"(ret) : "r"(__swab32(x))); > > > > + return ret; > > > > +} > > > > + > > > > +static __always_inline __attribute_const__ u16 __arch_bitrev16(u16 x) > > > > +{ > > > > + u16 ret; > > > > + > > > > + asm("bitrev.4b %0, %1" : "=r"(ret) : "r"(__swab16(x))); > > > > + return ret; > > > > +} > > > > + > > > > +static __always_inline __attribute_const__ u8 __arch_bitrev8(u8 x) > > > > +{ > > > > + u8 ret; > > > > + > > > > + asm("bitrev.4b %0, %1" : "=r"(ret) : "r"(x)); > > > > + return ret; > > > > +} > > > > + > > > > +#endif /* __LOONGARCH_ASM_BITREV_H__ */ > > > > diff --git a/arch/loongarch/include/asm/cmpxchg.h b/arch/loongarch/include/asm/cmpxchg.h > > > > new file mode 100644 > > > > index 000000000000..699925b8ff27 > > > > --- /dev/null > > > > +++ b/arch/loongarch/include/asm/cmpxchg.h > > > > @@ -0,0 +1,121 @@ > > > > +/* SPDX-License-Identifier: GPL-2.0 */ > > > > +/* > > > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > > > + */ > > > > +#ifndef __ASM_CMPXCHG_H > > > > +#define __ASM_CMPXCHG_H > > > > + > > > > +#include > > > > + > > > > +#define __xchg_asm(amswap_db, m, val) \ > > > > +({ \ > > > > + __typeof(val) __ret; \ > > > > + \ > > > > + __asm__ __volatile__ ( \ > > > > + " "amswap_db" %1, %z2, %0 \n" \ > > > > + : "+ZB" (*m), "=&r" (__ret) \ > > > > + : "Jr" (val) \ > > > > + : "memory"); \ > > > > + \ > > > > + __ret; \ > > > > +}) > > > > + > > > > +static inline unsigned long __xchg(volatile void *ptr, unsigned long x, > > > relaxed ? > > > > > > > + int size) > > > > +{ > > > > + switch (size) { > > > > + case 4: > > > > + return __xchg_asm("amswap_db.w", (volatile u32 *)ptr, (u32)x); > > > Your amswap_db don't have any implicit acquire/release, right? > > amswap don't have implicit acquire/release, but amswap_db has. > > > > Huacai > > > > > > > + > > > > + case 8: > > > > + return __xchg_asm("amswap_db.d", (volatile u64 *)ptr, (u64)x); > > > > + > > > > + default: > > > > + BUILD_BUG(); > > > > + } > > > > + > > > > + return 0; > > > > +} > > > > + > > > > +#define arch_xchg(ptr, x) \ > > > > +({ \ > > > > + __typeof__(*(ptr)) __res; \ > > > > + \ > > > > + __res = (__typeof__(*(ptr))) \ > > > > + __xchg((ptr), (unsigned long)(x), sizeof(*(ptr))); \ > > > > + \ > > > > + __res; \ > > > > +}) > > > > + > > > > +#define __cmpxchg_asm(ld, st, m, old, new) \ > > > > +({ \ > > > > + __typeof(old) __ret; \ > > > > + \ > > > > + __asm__ __volatile__( \ > > > > + "1: " ld " %0, %2 # __cmpxchg_asm \n" \ > > > > + " bne %0, %z3, 2f \n" \ > > > > + " or $t0, %z4, $zero \n" \ > > > > + " " st " $t0, %1 \n" \ > > > > + " beq $zero, $t0, 1b \n" \ > > > > + "2: \n" \ > > > > + : "=&r" (__ret), "=ZB"(*m) \ > > > > + : "ZB"(*m), "Jr" (old), "Jr" (new) \ > > > > + : "t0", "memory"); \ > > > > + \ > > > > + __ret; \ > > > > +}) > > > > + > > > > +static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old, > > > > + unsigned long new, unsigned int size) > > > > +{ > > > > + switch (size) { > > > > + case 4: > > > > + return __cmpxchg_asm("ll.w", "sc.w", (volatile u32 *)ptr, > > > > + (u32)old, new); > > > > + > > > > + case 8: > > > > + return __cmpxchg_asm("ll.d", "sc.d", (volatile u64 *)ptr, > > > > + (u64)old, new); > > > > + > > > > + default: > > > > + BUILD_BUG(); > > > > + } > > > > + > > > > + return 0; > > > > +} > > > > + > > > > +#define arch_cmpxchg_local(ptr, old, new) \ > > > > + ((__typeof__(*(ptr))) \ > > > > + __cmpxchg((ptr), \ > > > > + (unsigned long)(__typeof__(*(ptr)))(old), \ > > > > + (unsigned long)(__typeof__(*(ptr)))(new), \ > > > > + sizeof(*(ptr)))) > > > > + > > > > +#define arch_cmpxchg(ptr, old, new) \ > > > Ditto, it's a relaxed implementation, right? > > > > +({ \ > > > > + __typeof__(*(ptr)) __res; \ > > > > + \ > > > > + __res = arch_cmpxchg_local((ptr), (old), (new)); \ > > > > + \ > > > > + __res; \ > > > > +}) > > > > + > > > > +#ifdef CONFIG_64BIT > > > > +#define arch_cmpxchg64_local(ptr, o, n) \ > > > > + ({ \ > > > > + BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ > > > > + arch_cmpxchg_local((ptr), (o), (n)); \ > > > > + }) > > > > + > > > > +#define arch_cmpxchg64(ptr, o, n) \ > > > > + ({ \ > > > > + BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ > > > > + arch_cmpxchg((ptr), (o), (n)); \ > > > > + }) > > > > +#else > > > > +#include > > > > +#define arch_cmpxchg64_local(ptr, o, n) __generic_cmpxchg64_local((ptr), (o), (n)) > > > > +#define arch_cmpxchg64(ptr, o, n) arch_cmpxchg64_local((ptr), (o), (n)) > > > > +#endif > > > > + > > > > +#endif /* __ASM_CMPXCHG_H */ > > > > diff --git a/arch/loongarch/include/asm/local.h b/arch/loongarch/include/asm/local.h > > > > new file mode 100644 > > > > index 000000000000..2052a2267337 > > > > --- /dev/null > > > > +++ b/arch/loongarch/include/asm/local.h > > > > @@ -0,0 +1,138 @@ > > > > +/* SPDX-License-Identifier: GPL-2.0 */ > > > > +/* > > > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > > > + */ > > > > +#ifndef _ARCH_LOONGARCH_LOCAL_H > > > > +#define _ARCH_LOONGARCH_LOCAL_H > > > > + > > > > +#include > > > > +#include > > > > +#include > > > > +#include > > > > +#include > > > > + > > > > +typedef struct { > > > > + atomic_long_t a; > > > > +} local_t; > > > > + > > > > +#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) } > > > > + > > > > +#define local_read(l) atomic_long_read(&(l)->a) > > > > +#define local_set(l, i) atomic_long_set(&(l)->a, (i)) > > > > + > > > > +#define local_add(i, l) atomic_long_add((i), (&(l)->a)) > > > > +#define local_sub(i, l) atomic_long_sub((i), (&(l)->a)) > > > > +#define local_inc(l) atomic_long_inc(&(l)->a) > > > > +#define local_dec(l) atomic_long_dec(&(l)->a) > > > > + > > > > +/* > > > > + * Same as above, but return the result value > > > > + */ > > > > +static inline long local_add_return(long i, local_t *l) > > > > +{ > > > > + unsigned long result; > > > > + > > > > + __asm__ __volatile__( > > > > + " " __AMADD " %1, %2, %0 \n" > > > > + : "+ZB" (l->a.counter), "=&r" (result) > > > > + : "r" (i) > > > > + : "memory"); > > > > + result = result + i; > > > > + > > > > + return result; > > > > +} > > > > + > > > > +static inline long local_sub_return(long i, local_t *l) > > > > +{ > > > > + unsigned long result; > > > > + > > > > + __asm__ __volatile__( > > > > + " " __AMADD "%1, %2, %0 \n" > > > > + : "+ZB" (l->a.counter), "=&r" (result) > > > > + : "r" (-i) > > > > + : "memory"); > > > > + > > > > + result = result - i; > > > > + > > > > + return result; > > > > +} > > > > + > > > > +#define local_cmpxchg(l, o, n) \ > > > > + ((long)cmpxchg_local(&((l)->a.counter), (o), (n))) > > > > +#define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n))) > > > > + > > > > +/** > > > > + * local_add_unless - add unless the number is a given value > > > > + * @l: pointer of type local_t > > > > + * @a: the amount to add to l... > > > > + * @u: ...unless l is equal to u. > > > > + * > > > > + * Atomically adds @a to @l, so long as it was not @u. > > > > + * Returns non-zero if @l was not @u, and zero otherwise. > > > > + */ > > > > +#define local_add_unless(l, a, u) \ > > > > +({ \ > > > > + long c, old; \ > > > > + c = local_read(l); \ > > > > + while (c != (u) && (old = local_cmpxchg((l), c, c + (a))) != c) \ > > > > + c = old; \ > > > > + c != (u); \ > > > > +}) > > > > +#define local_inc_not_zero(l) local_add_unless((l), 1, 0) > > > > + > > > > +#define local_dec_return(l) local_sub_return(1, (l)) > > > > +#define local_inc_return(l) local_add_return(1, (l)) > > > > + > > > > +/* > > > > + * local_sub_and_test - subtract value from variable and test result > > > > + * @i: integer value to subtract > > > > + * @l: pointer of type local_t > > > > + * > > > > + * Atomically subtracts @i from @l and returns > > > > + * true if the result is zero, or false for all > > > > + * other cases. > > > > + */ > > > > +#define local_sub_and_test(i, l) (local_sub_return((i), (l)) == 0) > > > > + > > > > +/* > > > > + * local_inc_and_test - increment and test > > > > + * @l: pointer of type local_t > > > > + * > > > > + * Atomically increments @l by 1 > > > > + * and returns true if the result is zero, or false for all > > > > + * other cases. > > > > + */ > > > > +#define local_inc_and_test(l) (local_inc_return(l) == 0) > > > > + > > > > +/* > > > > + * local_dec_and_test - decrement by 1 and test > > > > + * @l: pointer of type local_t > > > > + * > > > > + * Atomically decrements @l by 1 and > > > > + * returns true if the result is 0, or false for all other > > > > + * cases. > > > > + */ > > > > +#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0) > > > > + > > > > +/* > > > > + * local_add_negative - add and test if negative > > > > + * @l: pointer of type local_t > > > > + * @i: integer value to add > > > > + * > > > > + * Atomically adds @i to @l and returns true > > > > + * if the result is negative, or false when > > > > + * result is greater than or equal to zero. > > > > + */ > > > > +#define local_add_negative(i, l) (local_add_return(i, (l)) < 0) > > > > + > > > > +/* Use these for per-cpu local_t variables: on some archs they are > > > > + * much more efficient than these naive implementations. Note they take > > > > + * a variable, not an address. > > > > + */ > > > > + > > > > +#define __local_inc(l) ((l)->a.counter++) > > > > +#define __local_dec(l) ((l)->a.counter++) > > > > +#define __local_add(i, l) ((l)->a.counter += (i)) > > > > +#define __local_sub(i, l) ((l)->a.counter -= (i)) > > > > + > > > > +#endif /* _ARCH_LOONGARCH_LOCAL_H */ > > > > diff --git a/arch/loongarch/include/asm/percpu.h b/arch/loongarch/include/asm/percpu.h > > > > new file mode 100644 > > > > index 000000000000..7d5b22ebd834 > > > > --- /dev/null > > > > +++ b/arch/loongarch/include/asm/percpu.h > > > > @@ -0,0 +1,20 @@ > > > > +/* SPDX-License-Identifier: GPL-2.0 */ > > > > +/* > > > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > > > + */ > > > > +#ifndef __ASM_PERCPU_H > > > > +#define __ASM_PERCPU_H > > > > + > > > > +/* Use r21 for fast access */ > > > > +register unsigned long __my_cpu_offset __asm__("$r21"); > > > > + > > > > +static inline void set_my_cpu_offset(unsigned long off) > > > > +{ > > > > + __my_cpu_offset = off; > > > > + csr_writeq(off, PERCPU_BASE_KS); > > > > +} > > > > +#define __my_cpu_offset __my_cpu_offset > > > > + > > > > +#include > > > > + > > > > +#endif /* __ASM_PERCPU_H */ > > > > -- > > > > 2.27.0 > > > > > > > > > > > > > -- > > > Best Regards > > > Guo Ren > > > > > > ML: https://lore.kernel.org/linux-csky/ > > > > -- > Best Regards > Guo Ren > > ML: https://lore.kernel.org/linux-csky/