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locking: Introduce prepare_sync_core_cmd()
Introduce an architecture function that architectures can use to set up ("prepare") SYNC_CORE commands. The function will be used by RISC-V to update its "deferred icache- flush" data structures (icache_stale_mask). Architectures defining prepare_sync_core_cmd() static inline need to select ARCH_HAS_PREPARE_SYNC_CORE_CMD. Suggested-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Andrea Parri <parri.andrea@gmail.com> Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Link: https://lore.kernel.org/r/20240131144936.29190-4-parri.andrea@gmail.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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@ -17,5 +17,19 @@ static inline void sync_core_before_usermode(void)
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}
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#endif
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#endif /* _LINUX_SYNC_CORE_H */
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#ifdef CONFIG_ARCH_HAS_PREPARE_SYNC_CORE_CMD
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#include <asm/sync_core.h>
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#else
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/*
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* This is a dummy prepare_sync_core_cmd() implementation that can be used on
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* all architectures which provide unconditional core serializing instructions
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* in switch_mm().
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* If your architecture doesn't provide such core serializing instructions in
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* switch_mm(), you may need to write your own functions.
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*/
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static inline void prepare_sync_core_cmd(struct mm_struct *mm)
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{
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}
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#endif
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#endif /* _LINUX_SYNC_CORE_H */
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@ -1970,6 +1970,9 @@ source "kernel/Kconfig.locks"
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config ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
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bool
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config ARCH_HAS_PREPARE_SYNC_CORE_CMD
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bool
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config ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
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bool
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@ -320,6 +320,7 @@ static int membarrier_private_expedited(int flags, int cpu_id)
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MEMBARRIER_STATE_PRIVATE_EXPEDITED_SYNC_CORE_READY))
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return -EPERM;
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ipi_func = ipi_sync_core;
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prepare_sync_core_cmd(mm);
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} else if (flags == MEMBARRIER_FLAG_RSEQ) {
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if (!IS_ENABLED(CONFIG_RSEQ))
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return -EINVAL;
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