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| author | Vincent Chen <vincent.chen@sifive.com> | 2021-03-22 22:26:06 +0800 |
|---|---|---|
| committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2021-04-26 08:24:58 -0700 |
| commit | bff3ff525460b492dca1d1665e821d2b5816ebdb (patch) | |
| tree | 2539544e7184b7974f96c38fced50a3516f92aa5 /arch/riscv/errata | |
| parent | 800149a77c2cb8746a94457939b1ba1e37d2c14e (diff) | |
| download | linux-stable-bff3ff525460b492dca1d1665e821d2b5816ebdb.tar.gz linux-stable-bff3ff525460b492dca1d1665e821d2b5816ebdb.tar.bz2 linux-stable-bff3ff525460b492dca1d1665e821d2b5816ebdb.zip | |
riscv: sifive: Apply errata "cip-1200" patch
For certain SiFive CPUs, "sfence.vma addr" cannot exactly flush addr
from TLB in the particular cases. The details could be found here:
https://sifive.cdn.prismic.io/sifive/167a1a56-03f4-4615-a79e-b2a86153148f_FU740_errata_20210205.pdf
In order to ensure the functionality, this patch uses the Alternative
scheme to replace all "sfence.vma addr" with "sfence.vma" at runtime.
Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch/riscv/errata')
| -rw-r--r-- | arch/riscv/errata/sifive/errata.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/riscv/errata/sifive/errata.c b/arch/riscv/errata/sifive/errata.c index e27391823f0f..f5e5ae70e829 100644 --- a/arch/riscv/errata/sifive/errata.c +++ b/arch/riscv/errata/sifive/errata.c @@ -29,11 +29,29 @@ static bool errata_cip_453_check_func(unsigned long arch_id, unsigned long impi return true; } +static bool errata_cip_1200_check_func(unsigned long arch_id, unsigned long impid) +{ + /* + * Affected cores: + * Architecture ID: 0x8000000000000007 or 0x1 + * Implement ID: mimpid[23:0] <= 0x200630 and mimpid != 0x01200626 + */ + if (arch_id != 0x8000000000000007 && arch_id != 0x1) + return false; + if ((impid & 0xffffff) > 0x200630 || impid == 0x1200626) + return false; + return true; +} + static struct errata_info_t errata_list[ERRATA_SIFIVE_NUMBER] = { { .name = "cip-453", .check_func = errata_cip_453_check_func }, + { + .name = "cip-1200", + .check_func = errata_cip_1200_check_func + }, }; static u32 __init sifive_errata_probe(unsigned long archid, unsigned long impid) |