From: Anshuman Khandual <anshuman.khandual@arm.com>
To: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, will@kernel.org,
catalin.marinas@arm.com, Mark Brown <broonie@kernel.org>,
James Clark <james.clark@arm.com>, Rob Herring <robh@kernel.org>,
Marc Zyngier <maz@kernel.org>,
Suzuki Poulose <suzuki.poulose@arm.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
linux-perf-users@vger.kernel.org
Subject: Re: [PATCH V11 02/10] arm64/perf: Add BRBE registers and fields
Date: Tue, 6 Jun 2023 09:57:08 +0530 [thread overview]
Message-ID: <d591f803-ab00-4d5a-f091-1f63e902eb9b@arm.com> (raw)
In-Reply-To: <ZH2U79ZP7HXNJctA@FVFF77S0Q05N>
On 6/5/23 13:25, Mark Rutland wrote:
> Hi ANshuman,
Hello Mark,
>
> This looks good to me, with some minor nits on enum value naming and field
> formatting.
Okay
>
> On Wed, May 31, 2023 at 09:34:20AM +0530, Anshuman Khandual wrote:
>> This adds BRBE related register definitions and various other related field
>> macros there in. These will be used subsequently in a BRBE driver which is
>> being added later on.
>>
>> Cc: Catalin Marinas <catalin.marinas@arm.com>
>> Cc: Will Deacon <will@kernel.org>
>> Cc: Marc Zyngier <maz@kernel.org>
>> Cc: Mark Rutland <mark.rutland@arm.com>
>> Cc: linux-arm-kernel@lists.infradead.org
>> Cc: linux-kernel@vger.kernel.org
>> Tested-by: James Clark <james.clark@arm.com>
>> Reviewed-by: Mark Brown <broonie@kernel.org>
>> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
>> ---
>> arch/arm64/include/asm/sysreg.h | 103 +++++++++++++++++++++
>> arch/arm64/tools/sysreg | 159 ++++++++++++++++++++++++++++++++
>> 2 files changed, 262 insertions(+)
>>
>> diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
>> index e72d9aaab6b1..12419c55d3b7 100644
>> --- a/arch/arm64/include/asm/sysreg.h
>> +++ b/arch/arm64/include/asm/sysreg.h
>> @@ -165,6 +165,109 @@
>> #define SYS_DBGDTRTX_EL0 sys_reg(2, 3, 0, 5, 0)
>> #define SYS_DBGVCR32_EL2 sys_reg(2, 4, 0, 7, 0)
>>
>> +#define __SYS_BRBINFO(n) sys_reg(2, 1, 8, ((n) & 0xf), ((((n) & 0x10)) >> 2 + 0))
>> +#define __SYS_BRBSRC(n) sys_reg(2, 1, 8, ((n) & 0xf), ((((n) & 0x10)) >> 2 + 1))
>> +#define __SYS_BRBTGT(n) sys_reg(2, 1, 8, ((n) & 0xf), ((((n) & 0x10)) >> 2 + 2))
>
> These look correct to me per ARM DDI 0487J.a
>
>> diff --git a/arch/arm64/tools/sysreg b/arch/arm64/tools/sysreg
>> index c9a0d1fa3209..44745f42262f 100644
>> --- a/arch/arm64/tools/sysreg
>> +++ b/arch/arm64/tools/sysreg
>> @@ -947,6 +947,165 @@ UnsignedEnum 3:0 BT
>> EndEnum
>> EndSysreg
>>
>> +
>> +SysregFields BRBINFx_EL1
>> +Res0 63:47
>> +Field 46 CCU
>> +Field 45:32 CC
>> +Res0 31:18
>> +Field 17 LASTFAILED
>> +Field 16 T
>> +Res0 15:14
>> +Enum 13:8 TYPE
>> + 0b000000 UNCOND_DIR
>> + 0b000001 INDIR
>> + 0b000010 DIR_LINK
>> + 0b000011 INDIR_LINK
>
> For clarity, I'd prefer that we use "DIRECT" and "INDIRECT" in full for each of
> these, i.e.
>
> 0b000000 UNCOND_DIRECT
> 0b000001 INDIRECT
> 0b000010 DIRECT_LINK
> 0b000011 INDIRECT_LINK
Okay, will change these as required.
>
>> + 0b000101 RET_SUB
>> + 0b000111 RET_EXCPT
>
> Similarly, I'm not keen on the suffixes here.
>
> I think these would be clearer as "RET" and "ERET", as those are short and
> unambiguous, and I think the alternative of spelling out "RET_SUBROUTINE" and
> "RET_EXCEPTION" is overly verbose.
Sure, will change as RET and ERET.
>
>> + 0b001000 COND_DIR
>
> As with above, I'd prefer "COND_DIRECT" here.
Okay, will change this as required.
>
>> + 0b100001 DEBUG_HALT
>> + 0b100010 CALL
>> + 0b100011 TRAP
>> + 0b100100 SERROR
>> + 0b100110 INST_DEBUG
>
> We generally use 'insn' rather than 'inst', so I'd prefer s/INST/INSN/ here.
>
>> + 0b100111 DATA_DEBUG
>> + 0b101010 ALGN_FAULT
>
> s/ALGN/ALIGN/
>
>> + 0b101011 INST_FAULT
>
> As above, I'd prefer "INSN_FAULT" here, though I'm confused that the
> architecture doesn't use "abort" naming for this.
Sure, will change as required but please note that INST/ALGN suffixes
have also been used to define the generic ABI. Although it should not
be a problem as such.
include/uapi/linux/perf_event.h
enum {
PERF_BR_NEW_FAULT_ALGN = 0, /* Alignment fault */
PERF_BR_NEW_FAULT_DATA = 1, /* Data fault */
PERF_BR_NEW_FAULT_INST = 2, /* Inst fault */
PERF_BR_NEW_ARCH_1 = 3, /* Architecture specific */
PERF_BR_NEW_ARCH_2 = 4, /* Architecture specific */
PERF_BR_NEW_ARCH_3 = 5, /* Architecture specific */
PERF_BR_NEW_ARCH_4 = 6, /* Architecture specific */
PERF_BR_NEW_ARCH_5 = 7, /* Architecture specific */
PERF_BR_NEW_MAX,
};
>
>> + 0b101100 DATA_FAULT
>> + 0b101110 IRQ
>> + 0b101111 FIQ
>> + 0b111001 DEBUG_EXIT
>> +EndEnum
>
> [...]
>
> +Sysreg BRBCR_EL1 2 1 9 0 0
>> +Res0 63:24
>> +Field 23 EXCEPTION
>> +Field 22 ERTN
>> +Res0 21:9
>> +Field 8 FZP
>> +Res0 7
>> +Enum 6:5 TS
>> + 0b01 VIRTUAL
>> + 0b10 GST_PHYSICAL
>
> s/GST/GUEST/
Okay
>
>> + 0b11 PHYSICAL
>> +EndEnum
>> +Field 4 MPRED
>> +Field 3 CC
>> +Res0 2
>> +Field 1 E1BRE
>> +Field 0 E0BRE
>> +EndSysreg
>
> [...]
>
>> +Sysreg BRBINFINJ_EL1 2 1 9 1 0
>> +Res0 63:47
>> +Field 46 CCU
>> +Field 45:32 CC
>> +Res0 31:18
>> +Field 17 LASTFAILED
>> +Field 16 T
>> +Res0 15:14
>> +Enum 13:8 TYPE
>> + 0b000000 UNCOND_DIR
>> + 0b000001 INDIR
>> + 0b000010 DIR_LINK
>> + 0b000011 INDIR_LINK
>> + 0b000100 RET_SUB
>> + 0b000100 RET_SUB
>> + 0b000111 RET_EXCPT
>> + 0b001000 COND_DIR
>> + 0b100001 DEBUG_HALT
>> + 0b100010 CALL
>> + 0b100011 TRAP
>> + 0b100100 SERROR
>> + 0b100110 INST_DEBUG
>> + 0b100111 DATA_DEBUG
>> + 0b101010 ALGN_FAULT
>> + 0b101011 INST_FAULT
>> + 0b101100 DATA_FAULT
>> + 0b101110 IRQ
>> + 0b101111 FIQ
>> + 0b111001 DEBUG_EXIT
>> +EndEnum
>
> Same comments as for BRBINFx_EL1.TYPE
Done.
>
>> +Enum 7:0 NUMREC
>> + 0b1000 8
>> + 0b10000 16
>> + 0b100000 32
>> + 0b1000000 64
>
> Could we please pad these to the same width, i.e. have
>
> 0b0001000 8
> 0b0010000 16
> 0b0100000 32
> 0b1000000 64
>
> That way it's much easier to see how these compare to one another, and it
> matches the usual style.
Sure, will add the padding.
>
> Otherwise, I see the ARM ARM lists these in hex, and using that would also be
> fine, e.g.
>
> 0x08 8
> 0x10 16
> 0x20 32
> 0x40 64
>
>> +EndEnum
>> +EndSysreg
>
> Thanks,
> Mark.
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next prev parent reply other threads:[~2023-06-06 4:27 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-31 4:04 [PATCH V11 00/10] arm64/perf: Enable branch stack sampling Anshuman Khandual
2023-05-31 4:04 ` [PATCH V11 01/10] drivers: perf: arm_pmu: Add new sched_task() callback Anshuman Khandual
2023-06-05 7:26 ` Mark Rutland
2023-05-31 4:04 ` [PATCH V11 02/10] arm64/perf: Add BRBE registers and fields Anshuman Khandual
2023-06-05 7:55 ` Mark Rutland
2023-06-06 4:27 ` Anshuman Khandual [this message]
2023-06-13 16:27 ` Mark Rutland
2023-06-14 2:59 ` Anshuman Khandual
2023-05-31 4:04 ` [PATCH V11 03/10] arm64/perf: Add branch stack support in struct arm_pmu Anshuman Khandual
2023-06-05 7:58 ` Mark Rutland
2023-06-06 4:47 ` Anshuman Khandual
2023-05-31 4:04 ` [PATCH V11 04/10] arm64/perf: Add branch stack support in struct pmu_hw_events Anshuman Khandual
2023-06-05 8:00 ` Mark Rutland
2023-05-31 4:04 ` [PATCH V11 05/10] arm64/perf: Add branch stack support in ARMV8 PMU Anshuman Khandual
2023-06-02 2:33 ` Namhyung Kim
2023-06-05 2:43 ` Anshuman Khandual
2023-06-05 12:05 ` Mark Rutland
2023-06-06 10:34 ` Anshuman Khandual
2023-06-06 10:41 ` Mark Rutland
2023-06-08 10:13 ` Suzuki K Poulose
2023-06-09 4:00 ` Anshuman Khandual
2023-06-09 9:54 ` Suzuki K Poulose
2023-06-09 7:14 ` Anshuman Khandual
2023-05-31 4:04 ` [PATCH V11 06/10] arm64/perf: Enable branch stack events via FEAT_BRBE Anshuman Khandual
2023-06-02 1:45 ` Namhyung Kim
2023-06-05 3:00 ` Anshuman Khandual
2023-06-05 13:43 ` Mark Rutland
2023-06-09 4:30 ` Anshuman Khandual
2023-06-09 12:37 ` Mark Rutland
2023-06-09 4:47 ` Anshuman Khandual
2023-06-09 12:42 ` Mark Rutland
2023-06-09 5:22 ` Anshuman Khandual
2023-06-09 12:47 ` Mark Rutland
2023-06-09 13:15 ` Mark Rutland
2023-06-09 13:34 ` James Clark
2023-05-31 4:04 ` [PATCH V11 07/10] arm64/perf: Add PERF_ATTACH_TASK_DATA to events with has_branch_stack() Anshuman Khandual
2023-05-31 4:04 ` [PATCH V11 08/10] arm64/perf: Add struct brbe_regset helper functions Anshuman Khandual
2023-06-02 2:40 ` Namhyung Kim
2023-06-05 3:14 ` Anshuman Khandual
2023-06-05 23:49 ` Namhyung Kim
2023-06-13 17:17 ` Mark Rutland
2023-06-14 5:14 ` Anshuman Khandual
2023-06-14 10:59 ` Mark Rutland
2023-05-31 4:04 ` [PATCH V11 09/10] arm64/perf: Implement branch records save on task sched out Anshuman Khandual
2023-05-31 4:04 ` [PATCH V11 10/10] arm64/perf: Implement branch records save on PMU IRQ Anshuman Khandual
2023-06-09 11:13 ` [PATCH V11 00/10] arm64/perf: Enable branch stack sampling Anshuman Khandual
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