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Date: Wed, 23 Sep 2020 21:11:01 +0800
From: Jiaxun Yang <jiaxun.yang@...goat.com>
To: Peng Fan <fanpeng@...ngson.cn>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...hat.com>,
Namhyung Kim <namhyung@...nel.org>,
Dengcheng Zhu <dzhu@...ecomp.com>,
Paul Burton <paulburton@...nel.org>,
Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
Ian Rogers <irogers@...gle.com>, linux-kernel@...r.kernel.org,
linux-mips@...r.kernel.org
Subject: Re: [PATCH] perf annotate mips: Add perf arch instructions annotate
handlers
在 2020/9/23 18:56, Peng Fan 写道:
> From: Dengcheng Zhu <dzhu@...ecomp.com>
>
> Support the MIPS architecture using the ins_ops association
> method. With this patch, perf-annotate can work well on MIPS.
>
> Testing it with a perf.data file collected on a mips machine:
> $./perf annotate -i perf.data
>
> : Disassembly of section .text:
> :
> : 00000000000be6a0 <get_next_seq>:
> : get_next_seq():
> 0.00 : be6a0: lw v0,0(a0)
> 0.00 : be6a4: daddiu sp,sp,-128
> 0.00 : be6a8: ld a7,72(a0)
> 0.00 : be6ac: gssq s5,s4,80(sp)
> 0.00 : be6b0: gssq s1,s0,48(sp)
> 0.00 : be6b4: gssq s8,gp,112(sp)
> 0.00 : be6b8: gssq s7,s6,96(sp)
> 0.00 : be6bc: gssq s3,s2,64(sp)
> 0.00 : be6c0: sd a3,0(sp)
> 0.00 : be6c4: move s0,a0
> 0.00 : be6c8: sd v0,32(sp)
> 0.00 : be6cc: sd a5,8(sp)
> 0.00 : be6d0: sd zero,8(a0)
> 0.00 : be6d4: sd a6,16(sp)
> 0.00 : be6d8: ld s2,48(a0)
> 8.53 : be6dc: ld s1,40(a0)
> 9.42 : be6e0: ld v1,32(a0)
> 0.00 : be6e4: nop
> 0.00 : be6e8: ld s4,24(a0)
> 0.00 : be6ec: ld s5,16(a0)
> 0.00 : be6f0: sd a7,40(sp)
> 10.11 : be6f4: ld s6,64(a0)
> ...
>
> The original patch link is:
> https://lore.kernel.org/patchwork/patch/1180480/
>
> Signed-off-by: Dengcheng Zhu <dzhu@...ecomp.com>
> Signed-off-by: Peng Fan <fanpeng@...ngson.cn>
> ---
>
> Add "bgtzl", "bltzl", "bgezl", "blezl", "beql"
> and "bnel", remove "bgtzal", "blezal", "beqzal",
> "bnezal" and "jialc". Because these five can not
> be found in the instruction manual.
Hi Peng Fan,
These instructions do exist in MIPS Release 6.
Please see MD00086-2B-MIPS32BIS-AFP-6.06[1].
Also I'd sugguest you to note your changes in commit
message instead of comments, Like:
```
Signed-off-by: Dengcheng Zhu <dzhu@...ecomp.com>
Signed-off-by: Peng Fan <fanpeng@...ngson.cn>
[fanpeng@...ngson.cn: Add missing "bgtzl", "bltzl",
"bgezl", "blezl", "beql" and "bnel" for pre-R6 processors]
```
Thanks.
[1]:
https://s3-eu-west-1.amazonaws.com/downloads-mips/documents/MD00086-2B-MIPS32BIS-AFP-6.06.pdf
- Jiaxun
>
> tools/perf/arch/mips/Build | 2 +-
> tools/perf/arch/mips/annotate/instructions.c | 41 ++++++++++++++++++++++++++++
> tools/perf/util/annotate.c | 8 ++++++
> 3 files changed, 50 insertions(+), 1 deletion(-)
> create mode 100644 tools/perf/arch/mips/annotate/instructions.c
>
> diff --git a/tools/perf/arch/mips/Build b/tools/perf/arch/mips/Build
> index 1bb8bf6..e4e5f33 100644
> --- a/tools/perf/arch/mips/Build
> +++ b/tools/perf/arch/mips/Build
> @@ -1 +1 @@
> -# empty
> +perf-y += util/
> diff --git a/tools/perf/arch/mips/annotate/instructions.c b/tools/perf/arch/mips/annotate/instructions.c
> new file mode 100644
> index 0000000..8fae8a1
> --- /dev/null
> +++ b/tools/perf/arch/mips/annotate/instructions.c
> @@ -0,0 +1,41 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +static
> +struct ins_ops *mips__associate_ins_ops(struct arch *arch, const char *name)
> +{
> + struct ins_ops *ops = NULL;
> +
> + if (!strncmp(name, "bal", 3) ||
> + !strncmp(name, "bgezal", 6) ||
> + !strncmp(name, "bltzal", 6) ||
> + !strncmp(name, "bgtzl", 5) ||
> + !strncmp(name, "bltzl", 5) ||
> + !strncmp(name, "bgezl", 5) ||
> + !strncmp(name, "blezl", 5) ||
> + !strncmp(name, "beql", 4) ||
> + !strncmp(name, "bnel", 4) ||
> + !strncmp(name, "jal", 3))
> + ops = &call_ops;
> + else if (!strncmp(name, "jr", 2))
> + ops = &ret_ops;
> + else if (name[0] == 'j' || name[0] == 'b')
> + ops = &jump_ops;
> + else
> + return NULL;
> +
> + arch__associate_ins_ops(arch, name, ops);
> +
> + return ops;
> +}
> +
> +static
> +int mips__annotate_init(struct arch *arch, char *cpuid __maybe_unused)
> +{
> + if (!arch->initialized) {
> + arch->associate_instruction_ops = mips__associate_ins_ops;
> + arch->initialized = true;
> + arch->objdump.comment_char = '#';
> + }
> +
> + return 0;
> +}
> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
> index 0a1fcf7..80a4a3d 100644
> --- a/tools/perf/util/annotate.c
> +++ b/tools/perf/util/annotate.c
> @@ -152,6 +152,7 @@ static int arch__associate_ins_ops(struct arch* arch, const char *name, struct i
> #include "arch/arm/annotate/instructions.c"
> #include "arch/arm64/annotate/instructions.c"
> #include "arch/csky/annotate/instructions.c"
> +#include "arch/mips/annotate/instructions.c"
> #include "arch/x86/annotate/instructions.c"
> #include "arch/powerpc/annotate/instructions.c"
> #include "arch/s390/annotate/instructions.c"
> @@ -175,6 +176,13 @@ static struct arch architectures[] = {
> .init = csky__annotate_init,
> },
> {
> + .name = "mips",
> + .init = mips__annotate_init,
> + .objdump = {
> + .comment_char = '#',
> + },
> + },
> + {
> .name = "x86",
> .init = x86__annotate_init,
> .instructions = x86__instructions,
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