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| author | Samuel Holland <samuel.holland@sifive.com> | 2024-03-27 07:49:49 +0300 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2024-04-29 20:49:31 +0300 |
| commit | d6dcdabafcd7c612b164079d00da6d9775863a0b (patch) | |
| tree | 891257d2841136d48575cc49123a13f10974beb3 /arch/riscv/mm | |
| parent | 20e03d702e00a3e0269a1d6f9549c2e370492054 (diff) | |
| download | linux-d6dcdabafcd7c612b164079d00da6d9775863a0b.tar.xz | |
riscv: Avoid TLB flush loops when affected by SiFive CIP-1200
Implementations affected by SiFive errata CIP-1200 have a bug which
forces the kernel to always use the global variant of the sfence.vma
instruction. When affected by this errata, do not attempt to flush a
range of addresses; each iteration of the loop would actually flush the
whole TLB instead. Instead, minimize the overall number of sfence.vma
instructions.
Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Yunhui Cui <cuiyunhui@bytedance.com>
Link: https://lore.kernel.org/r/20240327045035.368512-9-samuel.holland@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/mm')
| -rw-r--r-- | arch/riscv/mm/tlbflush.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c index ad7bdcfcc219..18af7b5053af 100644 --- a/arch/riscv/mm/tlbflush.c +++ b/arch/riscv/mm/tlbflush.c @@ -11,7 +11,7 @@ * Flush entire TLB if number of entries to be flushed is greater * than the threshold below. */ -static unsigned long tlb_flush_all_threshold __read_mostly = 64; +unsigned long tlb_flush_all_threshold __read_mostly = 64; static void local_flush_tlb_range_threshold_asid(unsigned long start, unsigned long size, |