[V3 0/4] powerpc/perf: Add instruction and data address registers to extended regs

7 messages, 3 authors, 2021-10-17 · open the first message on its own page

[V3 0/4] powerpc/perf: Add instruction and data address registers to extended regs

From: Athira Rajeev <hidden>
Date: 2021-10-07 06:56:06

Patch set adds PMU registers namely Sampled Instruction Address Register
(SIAR) and Sampled Data Address Register (SDAR) as part of extended regs
in PowerPC. These registers provides the instruction/data address and
adding these to extended regs helps in debug purposes.

Patch 1/4 and 2/4 refactors the existing macro definition of
PERF_REG_PMU_MASK_300 and PERF_REG_PMU_MASK_31 to make it more
readable.
Patch 3/4 adds SIAR and SDAR as part of the extended regs mask.
Patch 4/4 includes perf tools side changes to add the SPRs to
sample_reg_mask to use with -I? option.

Changelog:
Change from v2 -> v3:
Addressed review comments from Michael Ellerman
- Fixed the macro definition to use "unsigned long long"
  which otherwise will cause build error with perf on
  32-bit.
- Added Reviewed-by from Daniel Axtens for patch3.

Change from v1 -> v2:
Addressed review comments from Michael Ellerman
- Refactored the perf reg extended mask value macros for
  PERF_REG_PMU_MASK_300 and PERF_REG_PMU_MASK_31 to
  make it more readable. Also moved PERF_REG_EXTENDED_MAX
  along with enum definition similar to PERF_REG_POWERPC_MAX.

Athira Rajeev (4):
  powerpc/perf: Refactor the code definition of perf reg extended mask
  tools/perf: Refactor the code definition of perf reg extended mask in
    tools side header file
  powerpc/perf: Expose instruction and data address registers as part of
    extended regs
  tools/perf: Add perf tools support to expose instruction and data
    address registers as part of extended regs

 arch/powerpc/include/uapi/asm/perf_regs.h     | 28 ++++++++++++-------
 arch/powerpc/perf/perf_regs.c                 |  4 +++
 .../arch/powerpc/include/uapi/asm/perf_regs.h | 28 ++++++++++++-------
 tools/perf/arch/powerpc/include/perf_regs.h   |  2 ++
 tools/perf/arch/powerpc/util/perf_regs.c      |  2 ++
 5 files changed, 44 insertions(+), 20 deletions(-)

-- 
2.30.1 (Apple Git-130)

[V3 1/4] powerpc/perf: Refactor the code definition of perf reg extended mask

From: Athira Rajeev <hidden>
Date: 2021-10-07 06:56:48

PERF_REG_PMU_MASK_300 and PERF_REG_PMU_MASK_31 defines the mask
value for extended registers. Current definition of these mask values
uses hex constant and does not use registers by name, making it less
readable. Patch refactor the macro values by or'ing together the actual
register value constants. Also include PERF_REG_EXTENDED_MAX as
part of enum definition.

Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Athira Rajeev <redacted>
---
 arch/powerpc/include/uapi/asm/perf_regs.h | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/include/uapi/asm/perf_regs.h b/arch/powerpc/include/uapi/asm/perf_regs.h
index 578b3ee86105..085094553f3b 100644
--- a/arch/powerpc/include/uapi/asm/perf_regs.h
+++ b/arch/powerpc/include/uapi/asm/perf_regs.h

@@ -61,27 +61,32 @@ enum perf_event_powerpc_regs {
 	PERF_REG_POWERPC_PMC4,
 	PERF_REG_POWERPC_PMC5,
 	PERF_REG_POWERPC_PMC6,
-	/* Max regs without the extended regs */
+	/* Max mask value for interrupt regs w/o extended regs */
 	PERF_REG_POWERPC_MAX = PERF_REG_POWERPC_MMCRA + 1,
+	/* Max mask value for interrupt regs including extended regs */
+	PERF_REG_EXTENDED_MAX = PERF_REG_POWERPC_PMC6 + 1,
 };
 
 #define PERF_REG_PMU_MASK	((1ULL << PERF_REG_POWERPC_MAX) - 1)
 
-/* Exclude MMCR3, SIER2, SIER3 for CPU_FTR_ARCH_300 */
-#define	PERF_EXCLUDE_REG_EXT_300	(7ULL << PERF_REG_POWERPC_MMCR3)
-
 /*
  * PERF_REG_EXTENDED_MASK value for CPU_FTR_ARCH_300
  * includes 9 SPRS from MMCR0 to PMC6 excluding the
- * unsupported SPRS in PERF_EXCLUDE_REG_EXT_300.
+ * unsupported SPRS MMCR3, SIER2 and SIER3.
  */
-#define PERF_REG_PMU_MASK_300   ((0xfffULL << PERF_REG_POWERPC_MMCR0) - PERF_EXCLUDE_REG_EXT_300)
+#define PERF_REG_PMU_MASK_300	\
+	((1ULL << PERF_REG_POWERPC_MMCR0) | (1ULL << PERF_REG_POWERPC_MMCR1) | \
+	(1ULL << PERF_REG_POWERPC_MMCR2) | (1ULL << PERF_REG_POWERPC_PMC1) | \
+	(1ULL << PERF_REG_POWERPC_PMC2) | (1ULL << PERF_REG_POWERPC_PMC3) | \
+	(1ULL << PERF_REG_POWERPC_PMC4) | (1ULL << PERF_REG_POWERPC_PMC5) | \
+	(1ULL << PERF_REG_POWERPC_PMC6))
 
 /*
  * PERF_REG_EXTENDED_MASK value for CPU_FTR_ARCH_31
  * includes 12 SPRs from MMCR0 to PMC6.
  */
-#define PERF_REG_PMU_MASK_31   (0xfffULL << PERF_REG_POWERPC_MMCR0)
+#define PERF_REG_PMU_MASK_31	\
+	(PERF_REG_PMU_MASK_300 | (1ULL << PERF_REG_POWERPC_MMCR3) | \
+	(1ULL << PERF_REG_POWERPC_SIER2) | (1ULL << PERF_REG_POWERPC_SIER3))
 
-#define PERF_REG_EXTENDED_MAX  (PERF_REG_POWERPC_PMC6 + 1)
 #endif /* _UAPI_ASM_POWERPC_PERF_REGS_H */

-- 
2.30.1 (Apple Git-130)

[V3 2/4] tools/perf: Refactor the code definition of perf reg extended mask in tools side header file

From: Athira Rajeev <hidden>
Date: 2021-10-07 06:57:29

PERF_REG_PMU_MASK_300 and PERF_REG_PMU_MASK_31 defines the mask
value for extended registers. Current definition of these mask values
uses hex constant and does not use registers by name, making it less
readable. Patch refactor the macro values in perf tools side header file
by or'ing together the actual register value constants.

Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Athira Rajeev <redacted>
---
 .../arch/powerpc/include/uapi/asm/perf_regs.h | 21 ++++++++++++-------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/tools/arch/powerpc/include/uapi/asm/perf_regs.h b/tools/arch/powerpc/include/uapi/asm/perf_regs.h
index 578b3ee86105..085094553f3b 100644
--- a/tools/arch/powerpc/include/uapi/asm/perf_regs.h
+++ b/tools/arch/powerpc/include/uapi/asm/perf_regs.h

@@ -61,27 +61,32 @@ enum perf_event_powerpc_regs {
 	PERF_REG_POWERPC_PMC4,
 	PERF_REG_POWERPC_PMC5,
 	PERF_REG_POWERPC_PMC6,
-	/* Max regs without the extended regs */
+	/* Max mask value for interrupt regs w/o extended regs */
 	PERF_REG_POWERPC_MAX = PERF_REG_POWERPC_MMCRA + 1,
+	/* Max mask value for interrupt regs including extended regs */
+	PERF_REG_EXTENDED_MAX = PERF_REG_POWERPC_PMC6 + 1,
 };
 
 #define PERF_REG_PMU_MASK	((1ULL << PERF_REG_POWERPC_MAX) - 1)
 
-/* Exclude MMCR3, SIER2, SIER3 for CPU_FTR_ARCH_300 */
-#define	PERF_EXCLUDE_REG_EXT_300	(7ULL << PERF_REG_POWERPC_MMCR3)
-
 /*
  * PERF_REG_EXTENDED_MASK value for CPU_FTR_ARCH_300
  * includes 9 SPRS from MMCR0 to PMC6 excluding the
- * unsupported SPRS in PERF_EXCLUDE_REG_EXT_300.
+ * unsupported SPRS MMCR3, SIER2 and SIER3.
  */
-#define PERF_REG_PMU_MASK_300   ((0xfffULL << PERF_REG_POWERPC_MMCR0) - PERF_EXCLUDE_REG_EXT_300)
+#define PERF_REG_PMU_MASK_300	\
+	((1ULL << PERF_REG_POWERPC_MMCR0) | (1ULL << PERF_REG_POWERPC_MMCR1) | \
+	(1ULL << PERF_REG_POWERPC_MMCR2) | (1ULL << PERF_REG_POWERPC_PMC1) | \
+	(1ULL << PERF_REG_POWERPC_PMC2) | (1ULL << PERF_REG_POWERPC_PMC3) | \
+	(1ULL << PERF_REG_POWERPC_PMC4) | (1ULL << PERF_REG_POWERPC_PMC5) | \
+	(1ULL << PERF_REG_POWERPC_PMC6))
 
 /*
  * PERF_REG_EXTENDED_MASK value for CPU_FTR_ARCH_31
  * includes 12 SPRs from MMCR0 to PMC6.
  */
-#define PERF_REG_PMU_MASK_31   (0xfffULL << PERF_REG_POWERPC_MMCR0)
+#define PERF_REG_PMU_MASK_31	\
+	(PERF_REG_PMU_MASK_300 | (1ULL << PERF_REG_POWERPC_MMCR3) | \
+	(1ULL << PERF_REG_POWERPC_SIER2) | (1ULL << PERF_REG_POWERPC_SIER3))
 
-#define PERF_REG_EXTENDED_MAX  (PERF_REG_POWERPC_PMC6 + 1)
 #endif /* _UAPI_ASM_POWERPC_PERF_REGS_H */

-- 
2.30.1 (Apple Git-130)

[V3 3/4] powerpc/perf: Expose instruction and data address registers as part of extended regs

From: Athira Rajeev <hidden>
Date: 2021-10-07 06:58:10

Patch adds support to include Sampled Instruction Address Register
(SIAR) and Sampled Data Address Register (SDAR) SPRs as part of extended
registers. Update the definition of PERF_REG_PMU_MASK_300/31 and
PERF_REG_EXTENDED_MAX to include these SPR's.

Signed-off-by: Athira Rajeev <redacted>
Reviewed-by: Daniel Axtens <redacted>
---
 arch/powerpc/include/uapi/asm/perf_regs.h | 11 +++++++----
 arch/powerpc/perf/perf_regs.c             |  4 ++++
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/include/uapi/asm/perf_regs.h b/arch/powerpc/include/uapi/asm/perf_regs.h
index 085094553f3b..749a2e3af89e 100644
--- a/arch/powerpc/include/uapi/asm/perf_regs.h
+++ b/arch/powerpc/include/uapi/asm/perf_regs.h

@@ -61,17 +61,19 @@ enum perf_event_powerpc_regs {
 	PERF_REG_POWERPC_PMC4,
 	PERF_REG_POWERPC_PMC5,
 	PERF_REG_POWERPC_PMC6,
+	PERF_REG_POWERPC_SDAR,
+	PERF_REG_POWERPC_SIAR,
 	/* Max mask value for interrupt regs w/o extended regs */
 	PERF_REG_POWERPC_MAX = PERF_REG_POWERPC_MMCRA + 1,
 	/* Max mask value for interrupt regs including extended regs */
-	PERF_REG_EXTENDED_MAX = PERF_REG_POWERPC_PMC6 + 1,
+	PERF_REG_EXTENDED_MAX = PERF_REG_POWERPC_SIAR + 1,
 };
 
 #define PERF_REG_PMU_MASK	((1ULL << PERF_REG_POWERPC_MAX) - 1)
 
 /*
  * PERF_REG_EXTENDED_MASK value for CPU_FTR_ARCH_300
- * includes 9 SPRS from MMCR0 to PMC6 excluding the
+ * includes 11 SPRS from MMCR0 to SIAR excluding the
  * unsupported SPRS MMCR3, SIER2 and SIER3.
  */
 #define PERF_REG_PMU_MASK_300	\

@@ -79,11 +81,12 @@ enum perf_event_powerpc_regs {
 	(1ULL << PERF_REG_POWERPC_MMCR2) | (1ULL << PERF_REG_POWERPC_PMC1) | \
 	(1ULL << PERF_REG_POWERPC_PMC2) | (1ULL << PERF_REG_POWERPC_PMC3) | \
 	(1ULL << PERF_REG_POWERPC_PMC4) | (1ULL << PERF_REG_POWERPC_PMC5) | \
-	(1ULL << PERF_REG_POWERPC_PMC6))
+	(1ULL << PERF_REG_POWERPC_PMC6) | (1ULL << PERF_REG_POWERPC_SDAR) | \
+	(1ULL << PERF_REG_POWERPC_SIAR))
 
 /*
  * PERF_REG_EXTENDED_MASK value for CPU_FTR_ARCH_31
- * includes 12 SPRs from MMCR0 to PMC6.
+ * includes 14 SPRs from MMCR0 to SIAR.
  */
 #define PERF_REG_PMU_MASK_31	\
 	(PERF_REG_PMU_MASK_300 | (1ULL << PERF_REG_POWERPC_MMCR3) | \

diff --git a/arch/powerpc/perf/perf_regs.c b/arch/powerpc/perf/perf_regs.c
index b931eed482c9..51d31b65e423 100644
--- a/arch/powerpc/perf/perf_regs.c
+++ b/arch/powerpc/perf/perf_regs.c

@@ -90,7 +90,11 @@ static u64 get_ext_regs_value(int idx)
 		return mfspr(SPRN_SIER2);
 	case PERF_REG_POWERPC_SIER3:
 		return mfspr(SPRN_SIER3);
+	case PERF_REG_POWERPC_SDAR:
+		return mfspr(SPRN_SDAR);
 #endif
+	case PERF_REG_POWERPC_SIAR:
+		return mfspr(SPRN_SIAR);
 	default: return 0;
 	}
 }

-- 
2.30.1 (Apple Git-130)

[V3 4/4] tools/perf: Add perf tools support to expose instruction and data address registers as part of extended regs

From: Athira Rajeev <hidden>
Date: 2021-10-07 06:58:59

Patch enables presenting of Sampled Instruction Address Register (SIAR)
and Sampled Data Address Register (SDAR) SPRs as part of extended regsiters
for perf tool. Add these SPR's to sample_reg_mask in the tool side (to use
with -I? option).

Signed-off-by: Athira Rajeev <redacted>
---
 tools/arch/powerpc/include/uapi/asm/perf_regs.h | 11 +++++++----
 tools/perf/arch/powerpc/include/perf_regs.h     |  2 ++
 tools/perf/arch/powerpc/util/perf_regs.c        |  2 ++
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/tools/arch/powerpc/include/uapi/asm/perf_regs.h b/tools/arch/powerpc/include/uapi/asm/perf_regs.h
index 085094553f3b..749a2e3af89e 100644
--- a/tools/arch/powerpc/include/uapi/asm/perf_regs.h
+++ b/tools/arch/powerpc/include/uapi/asm/perf_regs.h

@@ -61,17 +61,19 @@ enum perf_event_powerpc_regs {
 	PERF_REG_POWERPC_PMC4,
 	PERF_REG_POWERPC_PMC5,
 	PERF_REG_POWERPC_PMC6,
+	PERF_REG_POWERPC_SDAR,
+	PERF_REG_POWERPC_SIAR,
 	/* Max mask value for interrupt regs w/o extended regs */
 	PERF_REG_POWERPC_MAX = PERF_REG_POWERPC_MMCRA + 1,
 	/* Max mask value for interrupt regs including extended regs */
-	PERF_REG_EXTENDED_MAX = PERF_REG_POWERPC_PMC6 + 1,
+	PERF_REG_EXTENDED_MAX = PERF_REG_POWERPC_SIAR + 1,
 };
 
 #define PERF_REG_PMU_MASK	((1ULL << PERF_REG_POWERPC_MAX) - 1)
 
 /*
  * PERF_REG_EXTENDED_MASK value for CPU_FTR_ARCH_300
- * includes 9 SPRS from MMCR0 to PMC6 excluding the
+ * includes 11 SPRS from MMCR0 to SIAR excluding the
  * unsupported SPRS MMCR3, SIER2 and SIER3.
  */
 #define PERF_REG_PMU_MASK_300	\

@@ -79,11 +81,12 @@ enum perf_event_powerpc_regs {
 	(1ULL << PERF_REG_POWERPC_MMCR2) | (1ULL << PERF_REG_POWERPC_PMC1) | \
 	(1ULL << PERF_REG_POWERPC_PMC2) | (1ULL << PERF_REG_POWERPC_PMC3) | \
 	(1ULL << PERF_REG_POWERPC_PMC4) | (1ULL << PERF_REG_POWERPC_PMC5) | \
-	(1ULL << PERF_REG_POWERPC_PMC6))
+	(1ULL << PERF_REG_POWERPC_PMC6) | (1ULL << PERF_REG_POWERPC_SDAR) | \
+	(1ULL << PERF_REG_POWERPC_SIAR))
 
 /*
  * PERF_REG_EXTENDED_MASK value for CPU_FTR_ARCH_31
- * includes 12 SPRs from MMCR0 to PMC6.
+ * includes 14 SPRs from MMCR0 to SIAR.
  */
 #define PERF_REG_PMU_MASK_31	\
 	(PERF_REG_PMU_MASK_300 | (1ULL << PERF_REG_POWERPC_MMCR3) | \

diff --git a/tools/perf/arch/powerpc/include/perf_regs.h b/tools/perf/arch/powerpc/include/perf_regs.h
index 04e5dc07e93f..93339d17acc4 100644
--- a/tools/perf/arch/powerpc/include/perf_regs.h
+++ b/tools/perf/arch/powerpc/include/perf_regs.h

@@ -77,6 +77,8 @@ static const char *reg_names[] = {
 	[PERF_REG_POWERPC_PMC4] = "pmc4",
 	[PERF_REG_POWERPC_PMC5] = "pmc5",
 	[PERF_REG_POWERPC_PMC6] = "pmc6",
+	[PERF_REG_POWERPC_SDAR] = "sdar",
+	[PERF_REG_POWERPC_SIAR] = "siar",
 };
 
 static inline const char *__perf_reg_name(int id)

diff --git a/tools/perf/arch/powerpc/util/perf_regs.c b/tools/perf/arch/powerpc/util/perf_regs.c
index 8116a253f91f..8d07a78e742a 100644
--- a/tools/perf/arch/powerpc/util/perf_regs.c
+++ b/tools/perf/arch/powerpc/util/perf_regs.c

@@ -74,6 +74,8 @@ const struct sample_reg sample_reg_masks[] = {
 	SMPL_REG(pmc4, PERF_REG_POWERPC_PMC4),
 	SMPL_REG(pmc5, PERF_REG_POWERPC_PMC5),
 	SMPL_REG(pmc6, PERF_REG_POWERPC_PMC6),
+	SMPL_REG(sdar, PERF_REG_POWERPC_SDAR),
+	SMPL_REG(siar, PERF_REG_POWERPC_SIAR),
 	SMPL_REG_END
 };

-- 
2.30.1 (Apple Git-130)

Re: [V3 0/4] powerpc/perf: Add instruction and data address registers to extended regs

From: kajoljain <hidden>
Date: 2021-10-11 13:10:28


On 10/7/21 12:25 PM, Athira Rajeev wrote:

Patch set adds PMU registers namely Sampled Instruction Address Register
(SIAR) and Sampled Data Address Register (SDAR) as part of extended regs
in PowerPC. These registers provides the instruction/data address and
adding these to extended regs helps in debug purposes.

Patch 1/4 and 2/4 refactors the existing macro definition of
PERF_REG_PMU_MASK_300 and PERF_REG_PMU_MASK_31 to make it more
readable.
Patch 3/4 adds SIAR and SDAR as part of the extended regs mask.
Patch 4/4 includes perf tools side changes to add the SPRs to
sample_reg_mask to use with -I? option.

Changelog:
Change from v2 -> v3:
Addressed review comments from Michael Ellerman
- Fixed the macro definition to use "unsigned long long"
  which otherwise will cause build error with perf on
  32-bit.
- Added Reviewed-by from Daniel Axtens for patch3.

Change from v1 -> v2:
Addressed review comments from Michael Ellerman
- Refactored the perf reg extended mask value macros for
  PERF_REG_PMU_MASK_300 and PERF_REG_PMU_MASK_31 to
  make it more readable. Also moved PERF_REG_EXTENDED_MAX
  along with enum definition similar to PERF_REG_POWERPC_MAX.

Athira Rajeev (4):
  powerpc/perf: Refactor the code definition of perf reg extended mask
  tools/perf: Refactor the code definition of perf reg extended mask in
    tools side header file
  powerpc/perf: Expose instruction and data address registers as part of
    extended regs
  tools/perf: Add perf tools support to expose instruction and data
    address registers as part of extended regs

Patch-set looks good to me.

Reviewed-by: Kajol Jain<redacted>

Thanks,
Kajol Jain

 arch/powerpc/include/uapi/asm/perf_regs.h     | 28 ++++++++++++-------
 arch/powerpc/perf/perf_regs.c                 |  4 +++
 .../arch/powerpc/include/uapi/asm/perf_regs.h | 28 ++++++++++++-------
 tools/perf/arch/powerpc/include/perf_regs.h   |  2 ++
 tools/perf/arch/powerpc/util/perf_regs.c      |  2 ++
 5 files changed, 44 insertions(+), 20 deletions(-)

Re: [V3 0/4] powerpc/perf: Add instruction and data address registers to extended regs

From: Michael Ellerman <hidden>
Date: 2021-10-17 12:33:17

On Thu, 7 Oct 2021 12:25:01 +0530, Athira Rajeev wrote:

Patch set adds PMU registers namely Sampled Instruction Address Register
(SIAR) and Sampled Data Address Register (SDAR) as part of extended regs
in PowerPC. These registers provides the instruction/data address and
adding these to extended regs helps in debug purposes.

Patch 1/4 and 2/4 refactors the existing macro definition of
PERF_REG_PMU_MASK_300 and PERF_REG_PMU_MASK_31 to make it more
readable.
Patch 3/4 adds SIAR and SDAR as part of the extended regs mask.
Patch 4/4 includes perf tools side changes to add the SPRs to
sample_reg_mask to use with -I? option.

[...]

Patches 1 and 3 applied to powerpc/next.

[1/4] powerpc/perf: Refactor the code definition of perf reg extended mask
      https://git.kernel.org/powerpc/c/02b182e67482d9167a13a0ff19b55037b70b21ad
[3/4] powerpc/perf: Expose instruction and data address registers as part of extended regs
      https://git.kernel.org/powerpc/c/29908bbf7b8960d261dfdd428bbaa656275e80f3

cheers

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