diff options
| -rw-r--r-- | arch/riscv/include/asm/atomic.h | 375 | ||||
| -rw-r--r-- | arch/riscv/include/asm/barrier.h | 68 | ||||
| -rw-r--r-- | arch/riscv/include/asm/bitops.h | 218 | ||||
| -rw-r--r-- | arch/riscv/include/asm/cacheflush.h | 39 | ||||
| -rw-r--r-- | arch/riscv/include/asm/cmpxchg.h | 134 | ||||
| -rw-r--r-- | arch/riscv/include/asm/io.h | 303 | ||||
| -rw-r--r-- | arch/riscv/include/asm/spinlock.h | 165 | ||||
| -rw-r--r-- | arch/riscv/include/asm/spinlock_types.h | 33 | ||||
| -rw-r--r-- | arch/riscv/include/asm/tlb.h | 24 | ||||
| -rw-r--r-- | arch/riscv/include/asm/tlbflush.h | 64 |
10 files changed, 1423 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/atomic.h b/arch/riscv/include/asm/atomic.h new file mode 100644 index 000000000000..e2e37c57cbeb --- /dev/null +++ b/arch/riscv/include/asm/atomic.h @@ -0,0 +1,375 @@ +/* + * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. + * Copyright (C) 2012 Regents of the University of California + * Copyright (C) 2017 SiFive + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ + +#ifndef _ASM_RISCV_ATOMIC_H +#define _ASM_RISCV_ATOMIC_H + +#ifdef CONFIG_GENERIC_ATOMIC64 +# include <asm-generic/atomic64.h> +#else +# if (__riscv_xlen < 64) +# error "64-bit atomics require XLEN to be at least 64" +# endif +#endif + +#include <asm/cmpxchg.h> +#include <asm/barrier.h> + +#define ATOMIC_INIT(i) { (i) } +static __always_inline int atomic_read(const atomic_t *v) +{ + return READ_ONCE(v->counter); +} +static __always_inline void atomic_set(atomic_t *v, int i) +{ + WRITE_ONCE(v->counter, i); +} + +#ifndef CONFIG_GENERIC_ATOMIC64 +#define ATOMIC64_INIT(i) { (i) } +static __always_inline long atomic64_read(const atomic64_t *v) +{ + return READ_ONCE(v->counter); +} +static __always_inline void atomic64_set(atomic64_t *v, long i) +{ + WRITE_ONCE(v->counter, i); +} +#endif + +/* + * First, the atomic ops that have no ordering constraints and therefor don't + * have the AQ or RL bits set. These don't return anything, so there's only + * one version to worry about. + */ +#define ATOMIC_OP(op, asm_op, c_op, I, asm_type, c_type, prefix) \ +static __always_inline void atomic##prefix##_##op(c_type i, atomic##prefix##_t *v) \ +{ \ + __asm__ __volatile__ ( \ + "amo" #asm_op "." #asm_type " zero, %1, %0" \ + : "+A" (v->counter) \ + : "r" (I) \ + : "memory"); \ +} + +#ifdef CONFIG_GENERIC_ATOMIC64 +#define ATOMIC_OPS(op, asm_op, c_op, I) \ + ATOMIC_OP (op, asm_op, c_op, I, w, int, ) +#else +#define ATOMIC_OPS(op, asm_op, c_op, I) \ + ATOMIC_OP (op, asm_op, c_op, I, w, int, ) \ + ATOMIC_OP (op, asm_op, c_op, I, d, long, 64) +#endif + +ATOMIC_OPS(add, add, +, i) +ATOMIC_OPS(sub, add, +, -i) +ATOMIC_OPS(and, and, &, i) +ATOMIC_OPS( or, or, |, i) +ATOMIC_OPS(xor, xor, ^, i) + +#undef ATOMIC_OP +#undef ATOMIC_OPS + +/* + * Atomic ops that have ordered, relaxed, acquire, and relese variants. + * There's two flavors of these: the arithmatic ops have both fetch and return + * versions, while the logical ops only have fetch versions. + */ +#define ATOMIC_FETCH_OP(op, asm_op, c_op, I, asm_or, c_or, asm_type, c_type, prefix) \ +static __always_inline c_type atomic##prefix##_fetch_##op##c_or(c_type i, atomic##prefix##_t *v) \ +{ \ + register c_type ret; \ + __asm__ __volatile__ ( \ + "amo" #asm_op "." #asm_type #asm_or " %1, %2, %0" \ + : "+A" (v->counter), "=r" (ret) \ + : "r" (I) \ + : "memory"); \ + return ret; \ +} + +#define ATOMIC_OP_RETURN(op, asm_op, c_op, I, asm_or, c_or, asm_type, c_type, prefix) \ +static __always_inline c_type atomic##prefix##_##op##_return##c_or(c_type i, atomic##prefix##_t *v) \ +{ \ + return atomic##prefix##_fetch_##op##c_or(i, v) c_op I; \ +} + +#ifdef CONFIG_GENERIC_ATOMIC64 +#define ATOMIC_OPS(op, asm_op, c_op, I, asm_or, c_or) \ + ATOMIC_FETCH_OP (op, asm_op, c_op, I, asm_or, c_or, w, int, ) \ + ATOMIC_OP_RETURN(op, asm_op, c_op, I, asm_or, c_or, w, int, ) +#else +#define ATOMIC_OPS(op, asm_op, c_op, I, asm_or, c_or) \ + ATOMIC_FETCH_OP (op, asm_op, c_op, I, asm_or, c_or, w, int, ) \ + ATOMIC_OP_RETURN(op, asm_op, c_op, I, asm_or, c_or, w, int, ) \ + ATOMIC_FETCH_OP (op, asm_op, c_op, I, asm_or, c_or, d, long, 64) \ + ATOMIC_OP_RETURN(op, asm_op, c_op, I, asm_or, c_or, d, long, 64) +#endif + +ATOMIC_OPS(add, add, +, i, , _relaxed) +ATOMIC_OPS(add, add, +, i, .aq , _acquire) +ATOMIC_OPS(add, add, +, i, .rl , _release) +ATOMIC_OPS(add, add, +, i, .aqrl, ) + +ATOMIC_OPS(sub, add, +, -i, , _relaxed) +ATOMIC_OPS(sub, add, +, -i, .aq , _acquire) +ATOMIC_OPS(sub, add, +, -i, .rl , _release) +ATOMIC_OPS(sub, add, +, -i, .aqrl, ) + +#undef ATOMIC_OPS + +#ifdef CONFIG_GENERIC_ATOMIC64 +#define ATOMIC_OPS(op, asm_op, c_op, I, asm_or, c_or) \ + ATOMIC_FETCH_OP(op, asm_op, c_op, I, asm_or, c_or, w, int, ) +#else +#define ATOMIC_OPS(op, asm_op, c_op, I, asm_or, c_or) \ + ATOMIC_FETCH_OP(op, asm_op, c_op, I, asm_or, c_or, w, int, ) \ + ATOMIC_FETCH_OP(op, asm_op, c_op, I, asm_or, c_or, d, long, 64) +#endif + +ATOMIC_OPS(and, and, &, i, , _relaxed) +ATOMIC_OPS(and, and, &, i, .aq , _acquire) +ATOMIC_OPS(and, and, &, i, .rl , _release) +ATOMIC_OPS(and, and, &, i, .aqrl, ) + +ATOMIC_OPS( or, or, |, i, , _relaxed) +ATOMIC_OPS( or, or, |, i, .aq , _acquire) +ATOMIC_OPS( or, or, |, i, .rl , _release) +ATOMIC_OPS( or, or, |, i, .aqrl, ) + +ATOMIC_OPS(xor, xor, ^, i, , _relaxed) +ATOMIC_OPS(xor, xor, ^, i, .aq , _acquire) +ATOMIC_OPS(xor, xor, ^, i, .rl , _release) +ATOMIC_OPS(xor, xor, ^, i, .aqrl, ) + +#undef ATOMIC_OPS + +#undef ATOMIC_FETCH_OP +#undef ATOMIC_OP_RETURN + +/* + * The extra atomic operations that are constructed from one of the core + * AMO-based operations above (aside from sub, which is easier to fit above). + * These are required to perform a barrier, but they're OK this way because + * atomic_*_return is also required to perform a barrier. + */ +#define ATOMIC_OP(op, func_op, comp_op, I, c_type, prefix) \ +static __always_inline bool atomic##prefix##_##op(c_type i, atomic##prefix##_t *v) \ +{ \ + return atomic##prefix##_##func_op##_return(i, v) comp_op I; \ +} + +#ifdef CONFIG_GENERIC_ATOMIC64 +#define ATOMIC_OPS(op, func_op, comp_op, I) \ + ATOMIC_OP (op, func_op, comp_op, I, int, ) +#else +#define ATOMIC_OPS(op, func_op, comp_op, I) \ + ATOMIC_OP (op, func_op, comp_op, I, int, ) \ + ATOMIC_OP (op, func_op, comp_op, I, long, 64) +#endif + +ATOMIC_OPS(add_and_test, add, ==, 0) +ATOMIC_OPS(sub_and_test, sub, ==, 0) +ATOMIC_OPS(add_negative, add, <, 0) + +#undef ATOMIC_OP +#undef ATOMIC_OPS + +#define ATOMIC_OP(op, func_op, c_op, I, c_type, prefix) \ +static __always_inline void atomic##prefix##_##op(atomic##prefix##_t *v) \ +{ \ + atomic##prefix##_##func_op(I, v); \ +} + +#define ATOMIC_FETCH_OP(op, func_op, c_op, I, c_type, prefix) \ +static __always_inline c_type atomic##prefix##_fetch_##op(atomic##prefix##_t *v) \ +{ \ + return atomic##prefix##_fetch_##func_op(I, v); \ +} + +#define ATOMIC_OP_RETURN(op, asm_op, c_op, I, c_type, prefix) \ +static __always_inline c_type atomic##prefix##_##op##_return(atomic##prefix##_t *v) \ +{ \ + return atomic##prefix##_fetch_##op(v) c_op I; \ +} + +#ifdef CONFIG_GENERIC_ATOMIC64 +#define ATOMIC_OPS(op, asm_op, c_op, I) \ + ATOMIC_OP (op, asm_op, c_op, I, int, ) \ + ATOMIC_FETCH_OP (op, asm_op, c_op, I, int, ) \ + ATOMIC_OP_RETURN(op, asm_op, c_op, I, int, ) +#else +#define ATOMIC_OPS(op, asm_op, c_op, I) \ + ATOMIC_OP (op, asm_op, c_op, I, int, ) \ + ATOMIC_FETCH_OP (op, asm_op, c_op, I, int, ) \ + ATOMIC_OP_RETURN(op, asm_op, c_op, I, int, ) \ + ATOMIC_OP (op, asm_op, c_op, I, long, 64) \ + ATOMIC_FETCH_OP (op, asm_op, c_op, I, long, 64) \ + ATOMIC_OP_RETURN(op, asm_op, c_op, I, long, 64) +#endif + +ATOMIC_OPS(inc, add, +, 1) +ATOMIC_OPS(dec, add, +, -1) + +#undef ATOMIC_OPS +#undef ATOMIC_OP +#undef ATOMIC_FETCH_OP +#undef ATOMIC_OP_RETURN + +#define ATOMIC_OP(op, func_op, comp_op, I, prefix) \ +static __always_inline bool atomic##prefix##_##op(atomic##prefix##_t *v) \ +{ \ + return atomic##prefix##_##func_op##_return(v) comp_op I; \ +} + +ATOMIC_OP(inc_and_test, inc, ==, 0, ) +ATOMIC_OP(dec_and_test, dec, ==, 0, ) +#ifndef CONFIG_GENERIC_ATOMIC64 +ATOMIC_OP(inc_and_test, inc, ==, 0, 64) +ATOMIC_OP(dec_and_test, dec, ==, 0, 64) +#endif + +#undef ATOMIC_OP + +/* This is required to provide a barrier on success. */ +static __always_inline int __atomic_add_unless(atomic_t *v, int a, int u) +{ + int prev, rc; + + __asm__ __volatile__ ( + "0:\n\t" + "lr.w.aqrl %[p], %[c]\n\t" + "beq %[p], %[u], 1f\n\t" + "add %[rc], %[p], %[a]\n\t" + "sc.w.aqrl %[rc], %[rc], %[c]\n\t" + "bnez %[rc], 0b\n\t" + "1:" + : [p]"=&r" (prev), [rc]"=&r" (rc), [c]"+A" (v->counter) + : [a]"r" (a), [u]"r" (u) + : "memory"); + return prev; +} + +#ifndef CONFIG_GENERIC_ATOMIC64 +static __always_inline long __atomic64_add_unless(atomic64_t *v, long a, long u) +{ + long prev, rc; + + __asm__ __volatile__ ( + "0:\n\t" + "lr.d.aqrl %[p], %[c]\n\t" + "beq %[p], %[u], 1f\n\t" + "add %[rc], %[p], %[a]\n\t" + "sc.d.aqrl %[rc], %[rc], %[c]\n\t" + "bnez %[rc], 0b\n\t" + "1:" + : [p]"=&r" (prev), [rc]"=&r" (rc), [c]"+A" (v->counter) + : [a]"r" (a), [u]"r" (u) + : "memory"); + return prev; +} + +static __always_inline int atomic64_add_unless(atomic64_t *v, long a, long u) +{ + return __atomic64_add_unless(v, a, u) != u; +} +#endif + +/* + * The extra atomic operations that are constructed from one of the core + * LR/SC-based operations above. + */ +static __always_inline int atomic_inc_not_zero(atomic_t *v) +{ + return __atomic_add_unless(v, 1, 0); +} + +#ifndef CONFIG_GENERIC_ATOMIC64 +static __always_inline long atomic64_inc_not_zero(atomic64_t *v) +{ + return atomic64_add_unless(v, 1, 0); +} +#endif + +/* + * atomic_{cmp,}xchg is required to have exactly the same ordering semantics as + * {cmp,}xchg and the operations that return, so they need a barrier. We just + * use the other implementations directly. + */ +#define ATOMIC_OP(c_t, prefix, c_or, size, asm_or) \ +static __always_inline c_t atomic##prefix##_cmpxchg##c_or(atomic##prefix##_t *v, c_t o, c_t n) \ +{ \ + return __cmpxchg(&(v->counter), o, n, size, asm_or, asm_or); \ +} \ +static __always_inline c_t atomic##prefix##_xchg##c_or(atomic##prefix##_t *v, c_t n) \ +{ \ + return __xchg(n, &(v->counter), size, asm_or); \ +} + +#ifdef CONFIG_GENERIC_ATOMIC64 +#define ATOMIC_OPS(c_or, asm_or) \ + ATOMIC_OP( int, , c_or, 4, asm_or) +#else +#define ATOMIC_OPS(c_or, asm_or) \ + ATOMIC_OP( int, , c_or, 4, asm_or) \ + ATOMIC_OP(long, 64, c_or, 8, asm_or) +#endif + +ATOMIC_OPS( , .aqrl) +ATOMIC_OPS(_acquire, .aq) +ATOMIC_OPS(_release, .rl) +ATOMIC_OPS(_relaxed, ) + +#undef ATOMIC_OPS +#undef ATOMIC_OP + +static __always_inline int atomic_sub_if_positive(atomic_t *v, int offset) +{ + int prev, rc; + + __asm__ __volatile__ ( + "0:\n\t" + "lr.w.aqrl %[p], %[c]\n\t" + "sub %[rc], %[p], %[o]\n\t" + "bltz %[rc], 1f\n\t" + "sc.w.aqrl %[rc], %[rc], %[c]\n\t" + "bnez %[rc], 0b\n\t" + "1:" + : [p]"=&r" (prev), [rc]"=&r" (rc), [c]"+A" (v->counter) + : [o]"r" (offset) + : "memory"); + return prev - offset; +} + +#define atomic_dec_if_positive(v) atomic_sub_if_positive(v, 1) + +#ifndef CONFIG_GENERIC_ATOMIC64 +static __always_inline long atomic64_sub_if_positive(atomic64_t *v, int offset) +{ + long prev, rc; + + __asm__ __volatile__ ( + "0:\n\t" + "lr.d.aqrl %[p], %[c]\n\t" + "sub %[rc], %[p], %[o]\n\t" + "bltz %[rc], 1f\n\t" + "sc.d.aqrl %[rc], %[rc], %[c]\n\t" + "bnez %[rc], 0b\n\t" + "1:" + : [p]"=&r" (prev), [rc]"=&r" (rc), [c]"+A" (v->counter) + : [o]"r" (offset) + : "memory"); + return prev - offset; +} + +#define atomic64_dec_if_positive(v) atomic64_sub_if_positive(v, 1) +#endif + +#endif /* _ASM_RISCV_ATOMIC_H */ diff --git a/arch/riscv/include/asm/barrier.h b/arch/riscv/include/asm/barrier.h new file mode 100644 index 000000000000..183534b7c39b --- /dev/null +++ b/arch/riscv/include/asm/barrier.h @@ -0,0 +1,68 @@ +/* + * Based on arch/arm/include/asm/barrier.h + * + * Copyright (C) 2012 ARM Ltd. + * Copyright (C) 2013 Regents of the University of California + * Copyright (C) 2017 SiFive + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef _ASM_RISCV_BARRIER_H +#define _ASM_RISCV_BARRIER_H + +#ifndef __ASSEMBLY__ + +#define nop() __asm__ __volatile__ ("nop") + +#define RISCV_FENCE(p, s) \ + __asm__ __volatile__ ("fence " #p "," #s : : : "memory") + +/* These barriers need to enforce ordering on both devices or memory. */ +#define mb() RISCV_FENCE(iorw,iorw) +#define rmb() RISCV_FENCE(ir,ir) +#define wmb() RISCV_FENCE(ow,ow) + +/* These barriers do not need to enforce ordering on devices, just memory. */ +#define smp_mb() RISCV_FENCE(rw,rw) +#define smp_rmb() RISCV_FENCE(r,r) +#define smp_wmb() RISCV_FENCE(w,w) + +/* + * These fences exist to enforce ordering around the relaxed AMOs. The + * documentation defines that + * " + * atomic_fetch_add(); + * is equivalent to: + * smp_mb__before_atomic(); + * atomic_fetch_add_relaxed(); + * smp_mb__after_atomic(); + * " + * So we emit full fences on both sides. + */ +#define __smb_mb__before_atomic() smp_mb() +#define __smb_mb__after_atomic() smp_mb() + +/* + * These barriers prevent accesses performed outside a spinlock from being moved + * inside a spinlock. Since RISC-V sets the aq/rl bits on our spinlock only + * enforce release consistency, we need full fences here. + */ +#define smb_mb__before_spinlock() smp_mb() +#define smb_mb__after_spinlock() smp_mb() + +#include <asm-generic/barrier.h> + +#endif /* __ASSEMBLY__ */ + +#endif /* _ASM_RISCV_BARRIER_H */ diff --git a/arch/riscv/include/asm/bitops.h b/arch/riscv/include/asm/bitops.h new file mode 100644 index 000000000000..7c281ef1d583 --- /dev/null +++ b/arch/riscv/include/asm/bitops.h @@ -0,0 +1,218 @@ +/* + * Copyright (C) 2012 Regents of the University of California + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef _ASM_RISCV_BITOPS_H +#define _ASM_RISCV_BITOPS_H + +#ifndef _LINUX_BITOPS_H +#error "Only <linux/bitops.h> can be included directly" +#endif /* _LINUX_BITOPS_H */ + +#include <linux/compiler.h> +#include <linux/irqflags.h> +#include <asm/barrier.h> +#include <asm/bitsperlong.h> + +#ifndef smp_mb__before_clear_bit +#define smp_mb__before_clear_bit() smp_mb() +#define smp_mb__after_clear_bit() smp_mb() +#endif /* smp_mb__before_clear_bit */ + +#include <asm-generic/bitops/__ffs.h> +#include <asm-generic/bitops/ffz.h> +#include <asm-generic/bitops/fls.h> +#include <asm-generic/bitops/__fls.h> +#include <asm-generic/bitops/fls64.h> +#include <asm-generic/bitops/find.h> +#include <asm-generic/bitops/sched.h> +#include <asm-generic/bitops/ffs.h> + +#include <asm-generic/bitops/hweight.h> + +#if (BITS_PER_LONG == 64) +#define __AMO(op) "amo" #op ".d" +#elif (BITS_PER_LONG == 32) +#define __AMO(op) "amo" #op ".w" +#else +#error "Unexpected BITS_PER_LONG" +#endif + +#define __test_and_op_bit_ord(op, mod, nr, addr, ord) \ +({ \ + unsigned long __res, __mask; \ + __mask = BIT_MASK(nr); \ + __asm__ __volatile__ ( \ + __AMO(op) #ord " %0, %2, %1" \ + : "=r" (__res), "+A" (addr[BIT_WORD(nr)]) \ + : "r" (mod(__mask)) \ + : "memory"); \ + ((__res & __mask) != 0); \ +}) + +#define __op_bit_ord(op, mod, nr, addr, ord) \ + __asm__ __volatile__ ( \ + __AMO(op) #ord " zero, %1, %0" \ + : "+A" (addr[BIT_WORD(nr)]) \ + : "r" (mod(BIT_MASK(nr))) \ + : "memory"); + +#define __test_and_op_bit(op, mod, nr, addr) \ + __test_and_op_bit_ord(op, mod, nr, addr, ) +#define __op_bit(op, mod, nr, addr) \ + __op_bit_ord(op, mod, nr, addr, ) + +/* Bitmask modifiers */ +#define __NOP(x) (x) +#define __NOT(x) (~(x)) + +/** + * test_and_set_bit - Set a bit and return its old value + * @nr: Bit to set + * @addr: Address to count from + * + * This operation may be reordered on other architectures than x86. + */ +static inline int test_and_set_bit(int nr, volatile unsigned long *addr) +{ + return __test_and_op_bit(or, __NOP, nr, addr); +} + +/** + * test_and_clear_bit - Clear a bit and return its old value + * @nr: Bit to clear + * @addr: Address to count from + * + * This operation can be reordered on other architectures other than x86. + */ +static inline int test_and_clear_bit(int nr, volatile unsigned long *addr) +{ + return __test_and_op_bit(and, __NOT, nr, addr); +} + +/** + * test_and_change_bit - Change a bit and return its old value + * @nr: Bit to change + * @addr: Address to count from + * + * This operation is atomic and cannot be reordered. + * It also implies a memory barrier. + */ +static inline int test_and_change_bit(int nr, volatile unsigned long *addr) +{ + return __test_and_op_bit(xor, __NOP, nr, addr); +} + +/** + * set_bit - Atomically set a bit in memory + * @nr: the bit to set + * @addr: the address to start counting from + * + * Note: there are no guarantees that this function will not be reordered + * on non x86 architectures, so if you are writing portable code, + * make sure not to rely on its reordering guarantees. + * + * Note that @nr may be almost arbitrarily large; this function is not + * restricted to acting on a single-word quantity. + */ +static inline void set_bit(int nr, volatile unsigned long *addr) +{ + __op_bit(or, __NOP, nr, addr); +} + +/** + * clear_bit - Clears a bit in memory + * @nr: Bit to clear + * @addr: Address to start counting from + * + * Note: there are no guarantees that this function will not be reordered + * on non x86 architectures, so if you are writing portable code, + * make sure not to rely on its reordering guarantees. + */ +static inline void clear_bit(int nr, volatile unsigned long *addr) +{ + __op_bit(and, __NOT, nr, addr); +} + +/** + * change_bit - Toggle a bit in memory + * @nr: Bit to change + * @addr: Address to start counting from + * + * change_bit() may be reordered on other architectures than x86. + * Note that @nr may be almost arbitrarily large; this function is not + * restricted to acting on a single-word quantity. + */ +static inline void change_bit(int nr, volatile unsigned long *addr) +{ + __op_bit(xor, __NOP, nr, addr); +} + +/** + * test_and_set_bit_lock - Set a bit and return its old value, for lock + * @nr: Bit to set + * @addr: Address to count from + * + * This operation is atomic and provides acquire barrier semantics. + * It can be used to implement bit locks. + */ +static inline int test_and_set_bit_lock( + unsigned long nr, volatile unsigned long *addr) +{ + return __test_and_op_bit_ord(or, __NOP, nr, addr, .aq); +} + +/** + * clear_bit_unlock - Clear a bit in memory, for unlock + * @nr: the bit to set + * @addr: the address to start counting from + * + * This operation is atomic and provides release barrier semantics. + */ +static inline void clear_bit_unlock( + unsigned long nr, volatile unsigned long *addr) +{ + __op_bit_ord(and, __NOT, nr, addr, .rl); +} + +/** + * __clear_bit_unlock - Clear a bit in memory, for unlock + * @nr: the bit to set + * @addr: the address to start counting from + * + * This operation is like clear_bit_unlock, however it is not atomic. + * It does provide release barrier semantics so it can be used to unlock + * a bit lock, however it would only be used if no other CPU can modify + * any bits in the memory until the lock is released (a good example is + * if the bit lock itself protects access to the other bits in the word). + * + * On RISC-V systems there seems to be no benefit to taking advantage of the + * non-atomic property here: it's a lot more instructions and we still have to + * provide release semantics anyway. + */ +static inline void __clear_bit_unlock( + unsigned long nr, volatile unsigned long *addr) +{ + clear_bit_unlock(nr, addr); +} + +#undef __test_and_op_bit +#undef __op_bit +#undef __NOP +#undef __NOT +#undef __AMO + +#include <asm-generic/bitops/non-atomic.h> +#include <asm-generic/bitops/le.h> +#include <asm-generic/bitops/ext2-atomic.h> + +#endif /* _ASM_RISCV_BITOPS_H */ diff --git a/arch/riscv/include/asm/cacheflush.h b/arch/riscv/include/asm/cacheflush.h new file mode 100644 index 000000000000..0595585013b0 --- /dev/null +++ b/arch/riscv/include/asm/cacheflush.h @@ -0,0 +1,39 @@ +/* + * Copyright (C) 2015 Regents of the University of California + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef _ASM_RISCV_CACHEFLUSH_H +#define _ASM_RISCV_CACHEFLUSH_H + +#include <asm-generic/cacheflush.h> + +#undef flush_icache_range +#undef flush_icache_user_range + +static inline void local_flush_icache_all(void) +{ + asm volatile ("fence.i" ::: "memory"); +} + +#ifndef CONFIG_SMP + +#define flush_icache_range(start, end) local_flush_icache_all() +#define flush_icache_user_range(vma, pg, addr, len) local_flush_icache_all() + +#else /* CONFIG_SMP */ + +#define flush_icache_range(start, end) sbi_remote_fence_i(0) +#define flush_icache_user_range(vma, pg, addr, len) sbi_remote_fence_i(0) + +#endif /* CONFIG_SMP */ + +#endif /* _ASM_RISCV_CACHEFLUSH_H */ diff --git a/arch/riscv/include/asm/cmpxchg.h b/arch/riscv/include/asm/cmpxchg.h new file mode 100644 index 000000000000..db249dbc7b97 --- /dev/null +++ b/arch/riscv/include/asm/cmpxchg.h @@ -0,0 +1,134 @@ +/* + * Copyright (C) 2014 Regents of the University of California + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef _ASM_RISCV_CMPXCHG_H +#define _ASM_RISCV_CMPXCHG_H + +#include <linux/bug.h> + +#include <asm/barrier.h> + +#define __xchg(new, ptr, size, asm_or) \ +({ \ + __typeof__(ptr) __ptr = (ptr); \ + __typeof__(new) __new = (new); \ + __typeof__(*(ptr)) __ret; \ + switch (size) { \ + case 4: \ + __asm__ __volatile__ ( \ + "amoswap.w" #asm_or " %0, %2, %1" \ + : "=r" (__ret), "+A" (*__ptr) \ + : "r" (__new) \ + : "memory"); \ + break; \ + case 8: \ + __asm__ __volatile__ ( \ + "amoswap.d" #asm_or " %0, %2, %1" \ + : "=r" (__ret), "+A" (*__ptr) \ + : "r" (__new) \ + : "memory"); \ + break; \ + default: \ + BUILD_BUG(); \ + } \ + __ret; \ +}) + +#define xchg(ptr, x) (__xchg((x), (ptr), sizeof(*(ptr)), .aqrl)) + +#define xchg32(ptr, x) \ +({ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 4); \ + xchg((ptr), (x)); \ +}) + +#define xchg64(ptr, x) \ +({ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ + xchg((ptr), (x)); \ +}) + +/* + * Atomic compare and exchange. Compare OLD with MEM, if identical, + * store NEW in MEM. Return the initial value in MEM. Success is + * indicated by comparing RETURN with OLD. + */ +#define __cmpxchg(ptr, old, new, size, lrb, scb) \ +({ \ + __typeof__(ptr) __ptr = (ptr); \ + __typeof__(*(ptr)) __old = (old); \ + __typeof__(*(ptr)) __new = (new); \ + __typeof__(*(ptr)) __ret; \ + register unsigned int __rc; \ + switch (size) { \ + case 4: \ + __asm__ __volatile__ ( \ + "0:" \ + "lr.w" #scb " %0, %2\n" \ + "bne %0, %z3, 1f\n" \ + "sc.w" #lrb " %1, %z4, %2\n" \ + "bnez %1, 0b\n" \ + "1:" \ + : "=&r" (__ret), "=&r" (__rc), "+A" (*__ptr) \ + : "rJ" (__old), "rJ" (__new) \ + : "memory"); \ + break; \ + case 8: \ + __asm__ __volatile__ ( \ + "0:" \ + "lr.d" #scb " %0, %2\n" \ + "bne %0, %z3, 1f\n" \ + "sc.d" #lrb " %1, %z4, %2\n" \ + "bnez %1, 0b\n" \ + "1:" \ + : "=&r" (__ret), "=&r" (__rc), "+A" (*__ptr) \ + : "rJ" (__old), "rJ" (__new) \ + : "memory"); \ + break; \ + default: \ + BUILD_BUG(); \ + } \ + __ret; \ +}) + +#define cmpxchg(ptr, o, n) \ + (__cmpxchg((ptr), (o), (n), sizeof(*(ptr)), .aqrl, .aqrl)) + +#define cmpxchg_local(ptr, o, n) \ + (__cmpxchg((ptr), (o), (n), sizeof(*(ptr)), , )) + +#define cmpxchg32(ptr, o, n) \ +({ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 4); \ + cmpxchg((ptr), (o), (n)); \ +}) + +#define cmpxchg32_local(ptr, o, n) \ +({ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 4); \ + cmpxchg_local((ptr), (o), (n)); \ +}) + +#define cmpxchg64(ptr, o, n) \ +({ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ + cmpxchg((ptr), (o), (n)); \ +}) + +#define cmpxchg64_local(ptr, o, n) \ +({ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ + cmpxchg_local((ptr), (o), (n)); \ +}) + +#endif /* _ASM_RISCV_CMPXCHG_H */ diff --git a/arch/riscv/include/asm/io.h b/arch/riscv/include/asm/io.h new file mode 100644 index 000000000000..c1f32cfcc79b --- /dev/null +++ b/arch/riscv/include/asm/io.h @@ -0,0 +1,303 @@ +/* + * {read,write}{b,w,l,q} based on arch/arm64/include/asm/io.h + * which was based on arch/arm/include/io.h + * + * Copyright (C) 1996-2000 Russell King + * Copyright (C) 2012 ARM Ltd. + * Copyright (C) 2014 Regents of the University of California + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef _ASM_RISCV_IO_H +#define _ASM_RISCV_IO_H + +#ifdef CONFIG_MMU + +extern void __iomem *ioremap(phys_addr_t offset, unsigned long size); + +/* + * The RISC-V ISA doesn't yet specify how to query or modify PMAs, so we can't + * change the properties of memory regions. This should be fixed by the + * upcoming platform spec. + */ +#define ioremap_nocache(addr, size) ioremap((addr), (size)) +#define ioremap_wc(addr, size) ioremap((addr), (size)) +#define ioremap_wt(addr, size) ioremap((addr), (size)) + +extern void iounmap(void __iomem *addr); + +#endif /* CONFIG_MMU */ + +/* Generic IO read/write. These perform native-endian accesses. */ +#define __raw_writeb __raw_writeb +static inline void __raw_writeb(u8 val, volatile void __iomem *addr) +{ + asm volatile("sb %0, 0(%1)" : : "r" (val), "r" (addr)); +} + +#define __raw_writew __raw_writew +static inline void __raw_writew(u16 val, volatile void __iomem *addr) +{ + asm volatile("sh %0, 0(%1)" : : "r" (val), "r" (addr)); +} + +#define __raw_writel __raw_writel +static inline void __raw_writel(u32 val, volatile void __iomem *addr) +{ + asm volatile("sw %0, 0(%1)" : : "r" (val), "r" (addr)); +} + +#ifdef CONFIG_64BIT +#define __raw_writeq __raw_writeq +static inline void __raw_writeq(u64 val, volatile void __iomem *addr) +{ + asm volatile("sd %0, 0(%1)" : : "r" (val), "r" (addr)); +} +#endif + +#define __raw_readb __raw_readb +static inline u8 __raw_readb(const volatile void __iomem *addr) +{ + u8 val; + + asm volatile("lb %0, 0(%1)" : "=r" (val) : "r" (addr)); + return val; +} + +#define __raw_readw __raw_readw +static inline u16 __raw_readw(const volatile void __iomem *addr) +{ + u16 val; + + asm volatile("lh %0, 0(%1)" : "=r" (val) : "r" (addr)); + return val; +} + +#define __raw_readl __raw_readl +static inline u32 __raw_readl(const volatile void __iomem *addr) +{ + u32 val; + + asm volatile("lw %0, 0(%1)" : "=r" (val) : "r" (addr)); + return val; +} + +#ifdef CONFIG_64BIT +#define __raw_readq __raw_readq +static inline u64 __raw_readq(const volatile void __iomem *addr) +{ + u64 val; + + asm volatile("ld %0, 0(%1)" : "=r" (val) : "r" (addr)); + return val; +} +#endif + +/* + * FIXME: I'm flip-flopping on whether or not we should keep this or enforce + * the ordering with I/O on spinlocks like PowerPC does. The worry is that + * drivers won't get this correct, but I also don't want to introduce a fence + * into the lock code that otherwise only uses AMOs (and is essentially defined + * by the ISA to be correct). For now I'm leaving this here: "o,w" is + * sufficient to ensure that all writes to the device have completed before the + * write to the spinlock is allowed to commit. I surmised this from reading + * "ACQUIRES VS I/O ACCESSES" in memory-barriers.txt. + */ +#define mmiowb() __asm__ __volatile__ ("fence o,w" : : : "memory"); + +/* + * Unordered I/O memory access primitives. These are even more relaxed than + * the relaxed versions, as they don't even order accesses between successive + * operations to the I/O regions. + */ +#define readb_cpu(c) ({ u8 __r = __raw_readb(c); __r; }) +#define readw_cpu(c) ({ u16 __r = le16_to_cpu((__force __le16)__raw_readw(c)); __r; }) +#define readl_cpu(c) ({ u32 __r = le32_to_cpu((__force __le32)__raw_readl(c)); __r; }) + +#define writeb_cpu(v,c) ((void)__raw_writeb((v),(c))) +#define writew_cpu(v,c) ((void)__raw_writew((__force u16)cpu_to_le16(v),(c))) +#define writel_cpu(v,c) ((void)__raw_writel((__force u32)cpu_to_le32(v),(c))) + +#ifdef CONFIG_64BIT +#define readq_cpu(c) ({ u64 __r = le64_to_cpu((__force __le64)__raw_readq(c)); __r; }) +#define writeq_cpu(v,c) ((void)__raw_writeq((__force u64)cpu_to_le64(v),(c))) +#endif + +/* + * Relaxed I/O memory access primitives. These follow the Device memory + * ordering rules but do not guarantee any ordering relative to Normal memory + * accesses. These are defined to order the indicated access (either a read or + * write) with all other I/O memory accesses. Since the platform specification + * defines that all I/O regions are strongly ordered on channel 2, no explicit + * fences are required to enforce this ordering. + */ +/* FIXME: These are now the same as asm-generic */ +#define __io_rbr() do {} while (0) +#define __io_rar() do {} while (0) +#define __io_rbw() do {} while (0) +#define __io_raw() do {} while (0) + +#define readb_relaxed(c) ({ u8 __v; __io_rbr(); __v = readb_cpu(c); __io_rar(); __v; }) +#define readw_relaxed(c) ({ u16 __v; __io_rbr(); __v = readw_cpu(c); __io_rar(); __v; }) +#define readl_relaxed(c) ({ u32 __v; __io_rbr(); __v = readl_cpu(c); __io_rar(); __v; }) + +#define writeb_relaxed(v,c) ({ __io_rbw(); writeb_cpu((v),(c)); __io_raw(); }) +#define writew_relaxed(v,c) ({ __io_rbw(); writew_cpu((v),(c)); __io_raw(); }) +#define writel_relaxed(v,c) ({ __io_rbw(); writel_cpu((v),(c)); __io_raw(); }) + +#ifdef CONFIG_64BIT +#define readq_relaxed(c) ({ u64 __v; __io_rbr(); __v = readq_cpu(c); __io_rar(); __v; }) +#define writeq_relaxed(v,c) ({ __io_rbw(); writeq_cpu((v),(c)); __io_raw(); }) +#endif + +/* + * I/O memory access primitives. Reads are ordered relative to any + * following Normal memory access. Writes are ordered relative to any prior + * Normal memory access. The memory barriers here are necessary as RISC-V + * doesn't define any ordering between the memory space and the I/O space. + */ +#define __io_br() do {} while (0) +#define __io_ar() __asm__ __volatile__ ("fence i,r" : : : "memory"); +#define __io_bw() __asm__ __volatile__ ("fence w,o" : : : "memory"); +#define __io_aw() do {} while (0) + +#define readb(c) ({ u8 __v; __io_br(); __v = readb_cpu(c); __io_ar(); __v; }) +#define readw(c) ({ u16 __v; __io_br(); __v = readw_cpu(c); __io_ar(); __v; }) +#define readl(c) ({ u32 __v; __io_br(); __v = readl_cpu(c); __io_ar(); __v; }) + +#define writeb(v,c) ({ __io_bw(); writeb_cpu((v),(c)); __io_aw(); }) +#define writew(v,c) ({ __io_bw(); writew_cpu((v),(c)); __io_aw(); }) +#define writel(v,c) ({ __io_bw(); writel_cpu((v),(c)); __io_aw(); }) + +#ifdef CONFIG_64BIT +#define readq(c) ({ u64 __v; __io_br(); __v = readq_cpu(c); __io_ar(); __v; }) +#define writeq(v,c) ({ __io_bw(); writeq_cpu((v),(c)); __io_aw(); }) +#endif + +/* + * Emulation routines for the port-mapped IO space used by some PCI drivers. + * These are defined as being "fully synchronous", but also "not guaranteed to + * be fully ordered with respect to other memory and I/O operations". We're + * going to be on the safe side here and just make them: + * - Fully ordered WRT each other, by bracketing them with two fences. The + * outer set contains both I/O so inX is ordered with outX, while the inner just + * needs the type of the access (I for inX and O for outX). + * - Ordered in the same manner as readX/writeX WRT memory by subsuming their + * fences. + * - Ordered WRT timer reads, so udelay and friends don't get elided by the + * implementation. + * Note that there is no way to actually enforce that outX is a non-posted + * operation on RISC-V, but hopefully the timer ordering constraint is + * sufficient to ensure this works sanely on controllers that support I/O + * writes. + */ +#define __io_pbr() __asm__ __volatile__ ("fence io,i" : : : "memory"); +#define __io_par() __asm__ __volatile__ ("fence i,ior" : : : "memory"); +#define __io_pbw() __asm__ __volatile__ ("fence iow,o" : : : "memory"); +#define __io_paw() __asm__ __volatile__ ("fence o,io" : : : "memory"); + +#define inb(c) ({ u8 __v; __io_pbr(); __v = readb_cpu((void*)(PCI_IOBASE + (c))); __io_par(); __v; }) +#define inw(c) ({ u16 __v; __io_pbr(); __v = readw_cpu((void*)(PCI_IOBASE + (c))); __io_par(); __v; }) +#define inl(c) ({ u32 __v; __io_pbr(); __v = readl_cpu((void*)(PCI_IOBASE + (c))); __io_par(); __v; }) + +#define outb(v,c) ({ __io_pbw(); writeb_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); }) +#define outw(v,c) ({ __io_pbw(); writew_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); }) +#define outl(v,c) ({ __io_pbw(); writel_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); }) + +#ifdef CONFIG_64BIT +#define inq(c) ({ u64 __v; __io_pbr(); __v = readq_cpu((void*)(c)); __io_par(); __v; }) +#define outq(v,c) ({ __io_pbw(); writeq_cpu((v),(void*)(c)); __io_paw(); }) +#endif + +/* + * Accesses from a single hart to a single I/O address must be ordered. This + * allows us to use the raw read macros, but we still need to fence before and + * after the block to ensure ordering WRT other macros. These are defined to + * perform host-endian accesses so we use __raw instead of __cpu. + */ +#define __io_reads_ins(port, ctype, len, bfence, afence) \ + static inline void __ ## port ## len(const volatile void __iomem *addr, \ + void *buffer, \ + unsigned int count) \ + { \ + bfence; \ + if (count) { \ + ctype *buf = buffer; \ + \ + do { \ + ctype x = __raw_read ## len(addr); \ + *buf++ = x; \ + } while (--count); \ + } \ + afence; \ + } + +#define __io_writes_outs(port, ctype, len, bfence, afence) \ + static inline void __ ## port ## len(volatile void __iomem *addr, \ + const void *buffer, \ + unsigned int count) \ + { \ + bfence; \ + if (count) { \ + const ctype *buf = buffer; \ + \ + do { \ + __raw_writeq(*buf++, addr); \ + } while (--count); \ + } \ + afence; \ + } + +__io_reads_ins(reads, u8, b, __io_br(), __io_ar()) +__io_reads_ins(reads, u16, w, __io_br(), __io_ar()) +__io_reads_ins(reads, u32, l, __io_br(), __io_ar()) +#define readsb(addr, buffer, count) __readsb(addr, buffer, count) +#define readsw(addr, buffer, count) __readsw(addr, buffer, count) +#define readsl(addr, buffer, count) __readsl(addr, buffer, count) + +__io_reads_ins(ins, u8, b, __io_pbr(), __io_par()) +__io_reads_ins(ins, u16, w, __io_pbr(), __io_par()) +__io_reads_ins(ins, u32, l, __io_pbr(), __io_par()) +#define insb(addr, buffer, count) __insb((void __iomem *)addr, buffer, count) +#define insw(addr, buffer, count) __insw((void __iomem *)addr, buffer, count) +#define insl(addr, buffer, count) __insl((void __iomem *)addr, buffer, count) + +__io_writes_outs(writes, u8, b, __io_bw(), __io_aw()) +__io_writes_outs(writes, u16, w, __io_bw(), __io_aw()) +__io_writes_outs(writes, u32, l, __io_bw(), __io_aw()) +#define writesb(addr, buffer, count) __writesb(addr, buffer, count) +#define writesw(addr, buffer, count) __writesw(addr, buffer, count) +#define writesl(addr, buffer, count) __writesl(addr, buffer, count) + +__io_writes_outs(outs, u8, b, __io_pbw(), __io_paw()) +__io_writes_outs(outs, u16, w, __io_pbw(), __io_paw()) +__io_writes_outs(outs, u32, l, __io_pbw(), __io_paw()) +#define outsb(addr, buffer, count) __outsb((void __iomem *)addr, buffer, count) +#define outsw(addr, buffer, count) __outsw((void __iomem *)addr, buffer, count) +#define outsl(addr, buffer, count) __outsl((void __iomem *)addr, buffer, count) + +#ifdef CONFIG_64BIT +__io_reads_ins(reads, u64, q, __io_br(), __io_ar()) +#define readsq(addr, buffer, count) __readsq(addr, buffer, count) + +__io_reads_ins(ins, u64, q, __io_pbr(), __io_par()) +#define insq(addr, buffer, count) __insq((void __iomem *)addr, buffer, count) + +__io_writes_outs(writes, u64, q, __io_bw(), __io_aw()) +#define writesq(addr, buffer, count) __writesq(addr, buffer, count) + +__io_writes_outs(outs, u64, q, __io_pbr(), __io_paw()) +#define outsq(addr, buffer, count) __outsq((void __iomem *)addr, buffer, count) +#endif + +#include <asm-generic/io.h> + +#endif /* _ASM_RISCV_IO_H */ diff --git a/arch/riscv/include/asm/spinlock.h b/arch/riscv/include/asm/spinlock.h new file mode 100644 index 000000000000..b3b394ffaf7e --- /dev/null +++ b/arch/riscv/include/asm/spinlock.h @@ -0,0 +1,165 @@ +/* + * Copyright (C) 2015 Regents of the University of California + * Copyright (C) 2017 SiFive + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef _ASM_RISCV_SPINLOCK_H +#define _ASM_RISCV_SPINLOCK_H + +#include <linux/kernel.h> +#include <asm/current.h> + +/* + * Simple spin lock operations. These provide no fairness guarantees. + */ + +/* FIXME: Replace this with a ticket lock, like MIPS. */ + +#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock) +#define arch_spin_is_locked(x) ((x)->lock != 0) + +static inline void arch_spin_unlock(arch_spinlock_t *lock) +{ + __asm__ __volatile__ ( + "amoswap.w.rl x0, x0, %0" + : "=A" (lock->lock) + :: "memory"); +} + +static inline int arch_spin_trylock(arch_spinlock_t *lock) +{ + int tmp = 1, busy; + + __asm__ __volatile__ ( + "amoswap.w.aq %0, %2, %1" + : "=r" (busy), "+A" (lock->lock) + : "r" (tmp) + : "memory"); + + return !busy; +} + +static inline void arch_spin_lock(arch_spinlock_t *lock) +{ + while (1) { + if (arch_spin_is_locked(lock)) + continue; + + if (arch_spin_trylock(lock)) + break; + } +} + +static inline void arch_spin_unlock_wait(arch_spinlock_t *lock) +{ + smp_rmb(); + do { + cpu_relax(); + } while (arch_spin_is_locked(lock)); + smp_acquire__after_ctrl_dep(); +} + +/***********************************************************/ + +static inline int arch_read_can_lock(arch_rwlock_t *lock) +{ + return lock->lock >= 0; +} + +static inline int arch_write_can_lock(arch_rwlock_t *lock) +{ + return lock->lock == 0; +} + +static inline void arch_read_lock(arch_rwlock_t *lock) +{ + int tmp; + + __asm__ __volatile__( + "1: lr.w %1, %0\n" + " bltz %1, 1b\n" + " addi %1, %1, 1\n" + " sc.w.aq %1, %1, %0\n" + " bnez %1, 1b\n" + : "+A" (lock->lock), "=&r" (tmp) + :: "memory"); +} + +static inline void arch_write_lock(arch_rwlock_t *lock) +{ + int tmp; + + __asm__ __volatile__( + "1: lr.w %1, %0\n" + " bnez %1, 1b\n" + " li %1, -1\n" + " sc.w.aq %1, %1, %0\n" + " bnez %1, 1b\n" + : "+A" (lock->lock), "=&r" (tmp) + :: "memory"); +} + +static inline int arch_read_trylock(arch_rwlock_t *lock) +{ + int busy; + + __asm__ __volatile__( + "1: lr.w %1, %0\n" + " bltz %1, 1f\n" + " addi %1, %1, 1\n" + " sc.w.aq %1, %1, %0\n" + " bnez %1, 1b\n" + "1:\n" + : "+A" (lock->lock), "=&r" (busy) + :: "memory"); + + return !busy; +} + +static inline int arch_write_trylock(arch_rwlock_t *lock) +{ + int busy; + + __asm__ __volatile__( + "1: lr.w %1, %0\n" + " bnez %1, 1f\n" + " li %1, -1\n" + " sc.w.aq %1, %1, %0\n" + " bnez %1, 1b\n" + "1:\n" + : "+A" (lock->lock), "=&r" (busy) + :: "memory"); + + return !busy; +} + +static inline void arch_read_unlock(arch_rwlock_t *lock) +{ + __asm__ __volatile__( + "amoadd.w.rl x0, %1, %0" + : "+A" (lock->lock) + : "r" (-1) + : "memory"); +} + +static inline void arch_write_unlock(arch_rwlock_t *lock) +{ + __asm__ __volatile__ ( + "amoswap.w.rl x0, x0, %0" + : "=A" (lock->lock) + :: "memory"); +} + +#define arch_read_lock_flags(lock, flags) arch_read_lock(lock) +#define arch_write_lock_flags(lock, flags) arch_write_lock(lock) + +#endif /* _ASM_RISCV_SPINLOCK_H */ diff --git a/arch/riscv/include/asm/spinlock_types.h b/arch/riscv/include/asm/spinlock_types.h new file mode 100644 index 000000000000..83ac4ac9e2ac --- /dev/null +++ b/arch/riscv/include/asm/spinlock_types.h @@ -0,0 +1,33 @@ +/* + * Copyright (C) 2015 Regents of the University of California + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef _ASM_RISCV_SPINLOCK_TYPES_H +#define _ASM_RISCV_SPINLOCK_TYPES_H + +#ifndef __LINUX_SPINLOCK_TYPES_H +# error "please don't include this file directly" +#endif + +typedef struct { + volatile unsigned int lock; +} arch_spinlock_t; + +#define __ARCH_SPIN_LOCK_UNLOCKED { 0 } + +typedef struct { + volatile unsigned int lock; +} arch_rwlock_t; + +#define __ARCH_RW_LOCK_UNLOCKED { 0 } + +#endif diff --git a/arch/riscv/include/asm/tlb.h b/arch/riscv/include/asm/tlb.h new file mode 100644 index 000000000000..c229509288ea --- /dev/null +++ b/arch/riscv/include/asm/tlb.h @@ -0,0 +1,24 @@ +/* + * Copyright (C) 2012 Regents of the University of California + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef _ASM_RISCV_TLB_H +#define _ASM_RISCV_TLB_H + +#include <asm-generic/tlb.h> + +static inline void tlb_flush(struct mmu_gather *tlb) +{ + flush_tlb_mm(tlb->mm); +} + +#endif /* _ASM_RISCV_TLB_H */ diff --git a/arch/riscv/include/asm/tlbflush.h b/arch/riscv/include/asm/tlbflush.h new file mode 100644 index 000000000000..5ee4ae370b5e --- /dev/null +++ b/arch/riscv/include/asm/tlbflush.h @@ -0,0 +1,64 @@ +/* + * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com> + * Copyright (C) 2012 Regents of the University of California + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef _ASM_RISCV_TLBFLUSH_H +#define _ASM_RISCV_TLBFLUSH_H + +#ifdef CONFIG_MMU + +/* Flush entire local TLB */ +static inline void local_flush_tlb_all(void) +{ + __asm__ __volatile__ ("sfence.vma" : : : "memory"); +} + +/* Flush one page from local TLB */ +static inline void local_flush_tlb_page(unsigned long addr) +{ + __asm__ __volatile__ ("sfence.vma %0" : : "r" (addr) : "memory"); +} + +#ifndef CONFIG_SMP + +#define flush_tlb_all() local_flush_tlb_all() +#define flush_tlb_page(vma, addr) local_flush_tlb_page(addr) +#define flush_tlb_range(vma, start, end) local_flush_tlb_all() + +#else /* CONFIG_SMP */ + +#include <asm/sbi.h> + +#define flush_tlb_all() sbi_remote_sfence_vma(0, 0, -1) +#define flush_tlb_page(vma, addr) flush_tlb_range(vma, addr, 0) +#define flush_tlb_range(vma, start, end) \ + sbi_remote_sfence_vma(0, start, (end) - (start)) + +#endif /* CONFIG_SMP */ + +/* Flush the TLB entries of the specified mm context */ +static inline void flush_tlb_mm(struct mm_struct *mm) +{ + flush_tlb_all(); +} + +/* Flush a range of kernel pages */ +static inline void flush_tlb_kernel_range(unsigned long start, + unsigned long end) +{ + flush_tlb_all(); +} + +#endif /* CONFIG_MMU */ + +#endif /* _ASM_RISCV_TLBFLUSH_H */ |