2023-02-27 15:55:07

by Christophe Leroy

Subject: [PATCH] powerpc/perf: Properly detect mpc7450 family

Unlike PVR_POWER8, etc ...., PVR_7450 represents a full PVR
value and not a family value.

To avoid confusion, do like E500 family and define the relevant
PVR_VER_xxxx values for the 7450 family:
0x8000 ==> 7450
0x8001 ==> 7455
0x8002 ==> 7447
0x8003 ==> 7447A
0x8004 ==> 7448

And use them to detect 7450 family for perf events.

Reported-by: kernel test robot <[email protected]>
Reported-by: Dan Carpenter <[email protected]>
Link: https://lore.kernel.org/r/[email protected]/
Fixes: ec3eb9d941a9 ("powerpc/perf: Use PVR rather than oprofile field to determine CPU version")
Signed-off-by: Christophe Leroy <[email protected]>
---
arch/powerpc/include/asm/reg.h | 5 +++++
arch/powerpc/perf/mpc7450-pmu.c | 6 +++---
2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 1e8b2e04e626..8fda87af2fa5 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -1310,6 +1310,11 @@
#define PVR_VER_E500MC 0x8023
#define PVR_VER_E5500 0x8024
#define PVR_VER_E6500 0x8040
+#define PVR_VER_7450 0x8000
+#define PVR_VER_7455 0x8001
+#define PVR_VER_7447 0x8002
+#define PVR_VER_7447A 0x8003
+#define PVR_VER_7448 0x8004

/*
* For the 8xx processors, all of them report the same PVR family for
diff --git a/arch/powerpc/perf/mpc7450-pmu.c b/arch/powerpc/perf/mpc7450-pmu.c
index 552d51a925d3..db451b9aac35 100644
--- a/arch/powerpc/perf/mpc7450-pmu.c
+++ b/arch/powerpc/perf/mpc7450-pmu.c
@@ -417,9 +417,9 @@ struct power_pmu mpc7450_pmu = {

static int __init init_mpc7450_pmu(void)
{
- unsigned int pvr = mfspr(SPRN_PVR);
-
- if (PVR_VER(pvr) != PVR_7450)
+ if (!pvr_version_is(PVR_VER_7450) && !pvr_version_is(PVR_VER_7455) &&
+ !pvr_version_is(PVR_VER_7447) && !pvr_version_is(PVR_VER_7447A) &&
+ !pvr_version_is(PVR_VER_7448))
return -ENODEV;

return register_power_pmu(&mpc7450_pmu);
--
2.39.1

2023-04-06 01:11:43

by Michael Ellerman

Subject: Re: [PATCH] powerpc/perf: Properly detect mpc7450 family

On Mon, 27 Feb 2023 16:54:45 +0100, Christophe Leroy wrote:
> Unlike PVR_POWER8, etc ...., PVR_7450 represents a full PVR
> value and not a family value.
>
> To avoid confusion, do like E500 family and define the relevant
> PVR_VER_xxxx values for the 7450 family:
> 0x8000 ==> 7450
> 0x8001 ==> 7455
> 0x8002 ==> 7447
> 0x8003 ==> 7447A
> 0x8004 ==> 7448
>
> [...]

Applied to powerpc/next.

[1/1] powerpc/perf: Properly detect mpc7450 family
https://git.kernel.org/powerpc/c/e7299f961fe5e4496db0bfaa9e819f5e97f3846b

cheers