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riscv: Only send remote fences when some other CPU is online
If no other CPU is online, a local cache or TLB flush is sufficient. These checks can be constant-folded when SMP is disabled. Signed-off-by: Samuel Holland <samuel.holland@sifive.com> Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Link: https://lore.kernel.org/r/20240327045035.368512-6-samuel.holland@sifive.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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@ -21,7 +21,9 @@ void flush_icache_all(void)
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{
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local_flush_icache_all();
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if (riscv_use_sbi_for_rfence())
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if (num_online_cpus() < 2)
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return;
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else if (riscv_use_sbi_for_rfence())
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sbi_remote_fence_i(NULL);
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else
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on_each_cpu(ipi_remote_fence_i, NULL, 1);
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@ -79,7 +79,9 @@ static void __ipi_flush_tlb_all(void *info)
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void flush_tlb_all(void)
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{
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if (riscv_use_sbi_for_rfence())
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if (num_online_cpus() < 2)
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local_flush_tlb_all();
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else if (riscv_use_sbi_for_rfence())
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sbi_remote_sfence_vma_asid(NULL, 0, FLUSH_TLB_MAX_SIZE, FLUSH_TLB_NO_ASID);
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else
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on_each_cpu(__ipi_flush_tlb_all, NULL, 1);
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