This is a note to let you know that I've just added the patch titled
RISC-V: Fix counter restart during overflow for RV32
to the 5.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
risc-v-fix-counter-restart-during-overflow-for-rv32.patch
and it can be found in the queue-5.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From acc1b919f47926b089be21b8aaa29ec91fef0aa2 Mon Sep 17 00:00:00 2001
From: Atish Patra <atishp@xxxxxxxxxxxx>
Date: Mon, 11 Jul 2022 10:46:28 -0700
Subject: RISC-V: Fix counter restart during overflow for RV32
From: Atish Patra <atishp@xxxxxxxxxxxx>
commit acc1b919f47926b089be21b8aaa29ec91fef0aa2 upstream.
Pass the upper half of the initial value of the counter correctly
for RV32.
Fixes: 4905ec2fb7e6 ("RISC-V: Add sscofpmf extension support")
Signed-off-by: Atish Patra <atishp@xxxxxxxxxxxx>
Reviewed-by: Guo Ren <guoren@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20220711174632.4186047-2-atishp@xxxxxxxxxxxx
Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/perf/riscv_pmu_sbi.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/perf/riscv_pmu_sbi.c
+++ b/drivers/perf/riscv_pmu_sbi.c
@@ -525,8 +525,13 @@ static inline void pmu_sbi_start_overflo
hwc = &event->hw;
max_period = riscv_pmu_ctr_get_width_mask(event);
init_val = local64_read(&hwc->prev_count) & max_period;
+#if defined(CONFIG_32BIT)
+ sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, idx, 1,
+ flag, init_val, init_val >> 32, 0);
+#else
sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, idx, 1,
flag, init_val, 0, 0);
+#endif
}
ctr_ovf_mask = ctr_ovf_mask >> 1;
idx++;
Patches currently in stable-queue which might be from atishp@xxxxxxxxxxxx are
queue-5.19/risc-v-kexec-fixup-use-of-smp_processor_id-in-preemptible-context.patch
queue-5.19/risc-v-fix-sbi-pmu-calls-for-rv32.patch
queue-5.19/risc-v-fix-counter-restart-during-overflow-for-rv32.patch
queue-5.19/risc-v-update-user-page-mapping-only-once-during-start.patch
