From: Weilong Chen chenweilong@huawei.com

ascend inclusion category: feature bugzilla: 46922 CVE: NA

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Taishan's L1/L2 cache is inclusive, and the data is consistent. Any change of L1 does not require DC operation to brush CL in L1 to L2. It's safe that don't clean data cache by address to point of unification.

Without IDC featrue, kernel needs to flush icache as well as dcache, causes performance degradation.

The flaw refers to V110/V200 variant 1.

Reviewed-by: Kefeng Wang wangkefeng.wang@huawei.com Reviewed-by: Ding Tianhong dingtianhong@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com Signed-off-by: Weilong Chen chenweilong@huawei.com Reviewed-by: Kefeng Wang wangkefeng.wang@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- Documentation/arm64/silicon-errata.txt | 1 + arch/arm64/Kconfig | 9 ++++++++ arch/arm64/include/asm/cpucaps.h | 3 ++- arch/arm64/include/asm/cputype.h | 2 ++ arch/arm64/kernel/cpu_errata.c | 32 ++++++++++++++++++++++++++ 5 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/Documentation/arm64/silicon-errata.txt b/Documentation/arm64/silicon-errata.txt index eeb3fc9d777b8..553e6aff38625 100644 --- a/Documentation/arm64/silicon-errata.txt +++ b/Documentation/arm64/silicon-errata.txt @@ -75,6 +75,7 @@ stable kernels. | Hisilicon | Hip0{5,6,7} | #161010101 | HISILICON_ERRATUM_161010101 | | Hisilicon | Hip0{6,7} | #161010701 | N/A | | Hisilicon | Hip07 | #161600802 | HISILICON_ERRATUM_161600802 | +| Hisilicon | TSV{110,200} | #1980005 | HISILICON_ERRATUM_1980005 | | | | | | | Qualcomm Tech. | Kryo/Falkor v1 | E1003 | QCOM_FALKOR_ERRATUM_1003 | | Qualcomm Tech. | Falkor v1 | E1009 | QCOM_FALKOR_ERRATUM_1009 | diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 9dfbd052bffc8..542c461e3d6bf 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -619,6 +619,15 @@ config HISILICON_ERRATUM_161600802

If unsure, say Y.

+config HISILICON_ERRATUM_1980005 + bool "Hisilicon erratum IDC support" + default n + help + The HiSilicon TSV100/200 SoC support idc but report wrong value to + kernel. + + If unsure, say N. + config QCOM_FALKOR_ERRATUM_E1041 bool "Falkor E1041: Speculative instruction fetches might cause errant memory access" default y diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h index a9090f204a085..d6c863d2cf984 100644 --- a/arch/arm64/include/asm/cpucaps.h +++ b/arch/arm64/include/asm/cpucaps.h @@ -56,7 +56,8 @@ #define ARM64_WORKAROUND_1463225 35 #define ARM64_HAS_CRC32 36 #define ARM64_SSBS 37 +#define ARM64_WORKAROUND_HISILICON_1980005 38

-#define ARM64_NCAPS 38 +#define ARM64_NCAPS 39

#endif /* __ASM_CPUCAPS_H */ diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h index 71e77e3900107..23298b0aedaf7 100644 --- a/arch/arm64/include/asm/cputype.h +++ b/arch/arm64/include/asm/cputype.h @@ -155,6 +155,8 @@ struct midr_range { .rv_max = MIDR_CPU_VAR_REV(v_max, r_max), \ }

+#define MIDR_REV_RANGE(m, v, r_min, r_max) MIDR_RANGE(m, v, r_min, v, r_max) +#define MIDR_REV(m, v, r) MIDR_RANGE(m, v, r, v, r) #define MIDR_ALL_VERSIONS(m) MIDR_RANGE(m, 0, 0, 0xf, 0xf)

static inline bool midr_is_cpu_model_range(u32 midr, u32 model, u32 rv_min, diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index 3c556ff2f33e1..8dbe94b4ec81e 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -71,6 +71,29 @@ is_kryo_midr(const struct arm64_cpu_capabilities *entry, int scope) return model == entry->midr_range.model; }

+#ifdef CONFIG_HISILICON_ERRATUM_1980005 +static bool +hisilicon_1980005_match(const struct arm64_cpu_capabilities *entry, + int scope) +{ + static const struct midr_range idc_support_list[] = { + MIDR_ALL_VERSIONS(MIDR_HISI_TSV110), + MIDR_REV(MIDR_HISI_TSV200, 1, 0), + { /* sentinel */ } + }; + + return is_midr_in_range_list(read_cpuid_id(), idc_support_list); +} + +static void +hisilicon_1980005_enable(const struct arm64_cpu_capabilities *__unused) +{ + cpus_set_cap(ARM64_HAS_CACHE_IDC); + arm64_ftr_reg_ctrel0.sys_val |= BIT(CTR_IDC_SHIFT); + sysreg_clear_set(sctlr_el1, SCTLR_EL1_UCT, 0); +} +#endif + static bool has_mismatched_cache_type(const struct arm64_cpu_capabilities *entry, int scope) @@ -848,6 +871,15 @@ const struct arm64_cpu_capabilities arm64_errata[] = { .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, .cpu_enable = cpu_enable_trap_ctr_access, }, +#ifdef CONFIG_HISILICON_ERRATUM_1980005 + { + .desc = "Taishan IDC coherence workaround", + .capability = ARM64_WORKAROUND_HISILICON_1980005, + .matches = hisilicon_1980005_match, + .type = ARM64_CPUCAP_SYSTEM_FEATURE, + .cpu_enable = hisilicon_1980005_enable, + }, +#endif #ifdef CONFIG_QCOM_FALKOR_ERRATUM_1003 { .desc = "Qualcomm Technologies Falkor erratum 1003",