[PATCH v3] perf: RISCV: Fix panic on pmu overflow handler
Alexandre Ghiti
alex at ghiti.fr
Wed Feb 28 01:10:29 PST 2024
Hi Fei,
On 28/02/2024 09:27, Fei Wu wrote:
> (1 << idx) of int is not desired when setting bits in unsigned long
> overflowed_ctrs, use BIT() instead. This panic happens when running
> 'perf record -e branches' on sophgo sg2042.
>
> [ 273.311852] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000098
> [ 273.320851] Oops [#1]
> [ 273.323179] Modules linked in:
> [ 273.326303] CPU: 0 PID: 1475 Comm: perf Not tainted 6.6.0-rc3+ #9
> [ 273.332521] Hardware name: Sophgo Mango (DT)
> [ 273.336878] epc : riscv_pmu_ctr_get_width_mask+0x8/0x62
> [ 273.342291] ra : pmu_sbi_ovf_handler+0x2e0/0x34e
> [ 273.347091] epc : ffffffff80aecd98 ra : ffffffff80aee056 sp : fffffff6e36928b0
> [ 273.354454] gp : ffffffff821f82d0 tp : ffffffd90c353200 t0 : 0000002ade4f9978
> [ 273.361815] t1 : 0000000000504d55 t2 : ffffffff8016cd8c s0 : fffffff6e3692a70
> [ 273.369180] s1 : 0000000000000020 a0 : 0000000000000000 a1 : 00001a8e81800000
> [ 273.376540] a2 : 0000003c00070198 a3 : 0000003c00db75a4 a4 : 0000000000000015
> [ 273.383901] a5 : ffffffd7ff8804b0 a6 : 0000000000000015 a7 : 000000000000002a
> [ 273.391327] s2 : 000000000000ffff s3 : 0000000000000000 s4 : ffffffd7ff8803b0
> [ 273.398773] s5 : 0000000000504d55 s6 : ffffffd905069800 s7 : ffffffff821fe210
> [ 273.406139] s8 : 000000007fffffff s9 : ffffffd7ff8803b0 s10: ffffffd903f29098
> [ 273.413660] s11: 0000000080000000 t3 : 0000000000000003 t4 : ffffffff8017a0ca
> [ 273.421022] t5 : ffffffff8023cfc2 t6 : ffffffd9040780e8
> [ 273.426437] status: 0000000200000100 badaddr: 0000000000000098 cause: 000000000000000d
> [ 273.434512] [<ffffffff80aecd98>] riscv_pmu_ctr_get_width_mask+0x8/0x62
> [ 273.441169] [<ffffffff80076bd8>] handle_percpu_devid_irq+0x98/0x1ee
> [ 273.447562] [<ffffffff80071158>] generic_handle_domain_irq+0x28/0x36
> [ 273.454151] [<ffffffff8047a99a>] riscv_intc_irq+0x36/0x4e
> [ 273.459659] [<ffffffff80c944de>] handle_riscv_irq+0x4a/0x74
> [ 273.465442] [<ffffffff80c94c48>] do_irq+0x62/0x92
> [ 273.470360] Code: 0420 60a2 6402 5529 0141 8082 0013 0000 0013 0000 (6d5c) b783
> [ 273.477921] ---[ end trace 0000000000000000 ]---
> [ 273.482630] Kernel panic - not syncing: Fatal exception in interrupt
>
> Reviewed-by: Atish Patra <atishp at rivosinc.com>
> Signed-off-by: Fei Wu <fei2.wu at intel.com>
> ---
> drivers/perf/riscv_pmu_sbi.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c
> index 16acd4dcdb96..452aab49db1e 100644
> --- a/drivers/perf/riscv_pmu_sbi.c
> +++ b/drivers/perf/riscv_pmu_sbi.c
> @@ -512,7 +512,7 @@ static void pmu_sbi_set_scounteren(void *arg)
>
> if (event->hw.idx != -1)
> csr_write(CSR_SCOUNTEREN,
> - csr_read(CSR_SCOUNTEREN) | (1 << pmu_sbi_csr_index(event)));
> + csr_read(CSR_SCOUNTEREN) | BIT(pmu_sbi_csr_index(event)));
> }
>
> static void pmu_sbi_reset_scounteren(void *arg)
> @@ -521,7 +521,7 @@ static void pmu_sbi_reset_scounteren(void *arg)
>
> if (event->hw.idx != -1)
> csr_write(CSR_SCOUNTEREN,
> - csr_read(CSR_SCOUNTEREN) & ~(1 << pmu_sbi_csr_index(event)));
> + csr_read(CSR_SCOUNTEREN) & ~BIT(pmu_sbi_csr_index(event)));
> }
>
> static void pmu_sbi_ctr_start(struct perf_event *event, u64 ival)
> @@ -731,14 +731,14 @@ static irqreturn_t pmu_sbi_ovf_handler(int irq, void *dev)
> /* compute hardware counter index */
> hidx = info->csr - CSR_CYCLE;
> /* check if the corresponding bit is set in sscountovf */
> - if (!(overflow & (1 << hidx)))
> + if (!(overflow & BIT(hidx)))
> continue;
>
> /*
> * Keep a track of overflowed counters so that they can be started
> * with updated initial value.
> */
> - overflowed_ctrs |= 1 << lidx;
> + overflowed_ctrs |= BIT(lidx);
> hw_evt = &event->hw;
> riscv_pmu_event_update(event);
> perf_sample_data_init(&data, 0, hw_evt->last_period);
You can add:
Reviewed-by: Alexandre Ghiti <alexghiti at rivosinc.com>
Thanks,
Alex
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