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[PW_SID:1149425] [v2] riscv: Add native this_cpu_cmpxchg() support #2510

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[PW_SID:1149425] [v2] riscv: Add native this_cpu_cmpxchg() support #2510

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2 changes: 1 addition & 1 deletion Documentation/features/locking/cmpxchg-local/arch-support.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,7 @@
| openrisc: | TODO |
| parisc: | TODO |
| powerpc: | TODO |
| riscv: | TODO |
| riscv: | ok |
| s390: | ok |
| sh: | TODO |
| sparc: | TODO |
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1 change: 1 addition & 0 deletions arch/riscv/Kconfig
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Expand Up @@ -155,6 +155,7 @@ config RISCV
select HAVE_ARCH_VMAP_STACK if MMU && 64BIT
select HAVE_ASM_MODVERSIONS
select HAVE_BUILDTIME_MCOUNT_SORT
select HAVE_CMPXCHG_LOCAL
select HAVE_CONTEXT_TRACKING_USER
select HAVE_DEBUG_KMEMLEAK
select HAVE_DMA_CONTIGUOUS if MMU
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49 changes: 49 additions & 0 deletions arch/riscv/include/asm/percpu.h
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Original file line number Diff line number Diff line change
@@ -0,0 +1,49 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _ASM_RISCV_PERCPU_H
#define _ASM_RISCV_PERCPU_H

#include <linux/preempt.h>

#include <asm/cmpxchg.h>

#define _protect_cmpxchg_local(pcp, o, n) \
({ \
typeof(pcp) *__ptr; \
typeof(pcp) __pcpu_old = (o); \
typeof(pcp) __pcpu_new = (n); \
typeof(*raw_cpu_ptr(&(pcp))) __ret; \
preempt_disable_notrace(); \
__ptr = raw_cpu_ptr(&(pcp)); \
__ret = cmpxchg_local(__ptr, __pcpu_old, __pcpu_new); \
preempt_enable_notrace(); \
__ret; \
})

#define this_cpu_cmpxchg_4(pcp, o, n) _protect_cmpxchg_local(pcp, o, n)

#ifdef CONFIG_64BIT
#define this_cpu_cmpxchg_8(pcp, o, n) _protect_cmpxchg_local(pcp, o, n)
#define this_cpu_cmpxchg64(pcp, o, n) this_cpu_cmpxchg_8(pcp, o, n)

#if defined(CONFIG_RISCV_ISA_ZACAS) && defined(CONFIG_TOOLCHAIN_HAS_ZACAS)
#define _protect_cmpxchg128_local(pcp, o, n) \
({ \
typeof(pcp) *__ptr; \
typeof(pcp) __pcpu_old = (o); \
typeof(pcp) __pcpu_new = (n); \
typeof(pcp) __ret; \
preempt_disable_notrace(); \
__ptr = raw_cpu_ptr(&(pcp)); \
__ret = cmpxchg128_local(__ptr, __pcpu_old, __pcpu_new); \
preempt_enable_notrace(); \
__ret; \
})

#define this_cpu_cmpxchg128(pcp, o, n) \
_protect_cmpxchg128_local(pcp, o, n)
#endif
#endif

#include <asm-generic/percpu.h>

#endif /* _ASM_RISCV_PERCPU_H */
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