linux-kernel - Re: [RFC PATCH v3 1/2] arm64: tlb: Detect the ARMv8.4 TLBI RANGE feature

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Date:   Mon, 18 May 2020 09:52:12 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Zhenyu Ye <yezhenyu2@...wei.com>,
        Mark Rutland <mark.rutland@....com>
Cc:     will@...nel.org, catalin.marinas@....com, suzuki.poulose@....com,
        maz@...nel.org, steven.price@....com, guohanjun@...wei.com,
        olof@...om.net, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org, xiexiangyou@...wei.com,
        zhangshaokun@...ilicon.com, linux-mm@...ck.org, arm@...nel.org,
        prime.zeng@...ilicon.com, kuhn.chenqun@...wei.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH v3 1/2] arm64: tlb: Detect the ARMv8.4 TLBI RANGE
 feature



On 05/11/2020 05:55 PM, Zhenyu Ye wrote:
> On 2020/5/5 18:14, Mark Rutland wrote:
>> On Tue, Apr 14, 2020 at 07:28:34PM +0800, Zhenyu Ye wrote:
>>> ARMv8.4-TLBI provides TLBI invalidation instruction that apply to a
>>> range of input addresses. This patch detect this feature.
>>>
>>> Signed-off-by: Zhenyu Ye <yezhenyu2@...wei.com>
>>> ---
>>>  arch/arm64/include/asm/cpucaps.h |  3 ++-
>>>  arch/arm64/include/asm/sysreg.h  |  4 ++++
>>>  arch/arm64/kernel/cpufeature.c   | 11 +++++++++++
>>>  3 files changed, 17 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h
>>> index 8eb5a088ae65..950095a72617 100644
>>> --- a/arch/arm64/include/asm/cpucaps.h
>>> +++ b/arch/arm64/include/asm/cpucaps.h
>>> @@ -61,7 +61,8 @@
>>>  #define ARM64_HAS_AMU_EXTN			51
>>>  #define ARM64_HAS_ADDRESS_AUTH			52
>>>  #define ARM64_HAS_GENERIC_AUTH			53
>>> +#define ARM64_HAS_TLBI_RANGE			54
>>>  
>>> -#define ARM64_NCAPS				54
>>> +#define ARM64_NCAPS				55
>>>  
>>>  #endif /* __ASM_CPUCAPS_H */
>>> diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
>>> index ebc622432831..ac1b98650234 100644
>>> --- a/arch/arm64/include/asm/sysreg.h
>>> +++ b/arch/arm64/include/asm/sysreg.h
>>> @@ -592,6 +592,7 @@
>>>  
>>>  /* id_aa64isar0 */
>>>  #define ID_AA64ISAR0_RNDR_SHIFT		60
>>> +#define ID_AA64ISAR0_TLBI_RANGE_SHIFT	56
>>>  #define ID_AA64ISAR0_TS_SHIFT		52
>>>  #define ID_AA64ISAR0_FHM_SHIFT		48
>>>  #define ID_AA64ISAR0_DP_SHIFT		44
>>> @@ -605,6 +606,9 @@
>>>  #define ID_AA64ISAR0_SHA1_SHIFT		8
>>>  #define ID_AA64ISAR0_AES_SHIFT		4
>>>  
>>> +#define ID_AA64ISAR0_TLBI_RANGE_NI	0x0
>>> +#define ID_AA64ISAR0_TLBI_RANGE		0x2
>>> +
>>>  /* id_aa64isar1 */
>>>  #define ID_AA64ISAR1_I8MM_SHIFT		52
>>>  #define ID_AA64ISAR1_DGH_SHIFT		48
>>> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
>>> index 9fac745aa7bb..31bcfd0722b5 100644
>>> --- a/arch/arm64/kernel/cpufeature.c
>>> +++ b/arch/arm64/kernel/cpufeature.c
>>> @@ -124,6 +124,7 @@ static bool __system_matches_cap(unsigned int n);
>>>   */
>>>  static const struct arm64_ftr_bits ftr_id_aa64isar0[] = {
>>>  	ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_RNDR_SHIFT, 4, 0),
>>> +	ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_TLBI_RANGE_SHIFT, 4, 0),

Hello Zhenyu,

This is already being added through another patch [1] in a series [2] which primarily
has cpufeature changes. I will soon update the series making this feature FTR_HIDDEN.

[1] https://patchwork.kernel.org/patch/11523881/
[2] https://patchwork.kernel.org/project/linux-arm-kernel/list/?series=281211

I am planning to respin the series (V4) based on arm64 tree (for-next/cpufeature). So
could you please rebase this patch (probably dropping cpufeature related changes) on
upcoming V4, so that all the changes will be based on arm64 tree (for-next/cpufeature).

- Anshuman