On 03/07/2022 14:09, Yixun Lan wrote:
> Enable this option to fix a bcc error in RISC-V platform
>
> And, the error shows as follows:
>
> ~ # runqlen
> WARNING: This target JIT is not designed for the host you are running. \
> If bad things happen, please choose a different -march switch.
> bpf: Failed to load program: Invalid argument
> 0: R1=ctx(off=0,imm=0) R10=fp0
> 0: (85) call bpf_get_current_task#35 ; R0_w=scalar()
> 1: (b7) r6 = 0 ; R6_w=0
> 2: (7b) *(u64 *)(r10 -8) = r6 ; R6_w=P0 R10=fp0 fp-8_w=00000000
> 3: (07) r0 += 312 ; R0_w=scalar()
> 4: (bf) r1 = r10 ; R1_w=fp0 R10=fp0
> 5: (07) r1 += -8 ; R1_w=fp-8
> 6: (b7) r2 = 8 ; R2_w=8
> 7: (bf) r3 = r0 ; R0_w=scalar(id=1) R3_w=scalar(id=1)
> 8: (85) call bpf_probe_read#4
> unknown func bpf_probe_read#4
> processed 9 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0
>
> Traceback (most recent call last):
> File "/usr/lib/python-exec/python3.9/runqlen", line 187, in <module>
> b.attach_perf_event(ev_type=PerfType.SOFTWARE,
> File "/usr/lib/python3.9/site-packages/bcc/__init__.py", line 1228, in attach_perf_event
> fn = self.load_func(fn_name, BPF.PERF_EVENT)
> File "/usr/lib/python3.9/site-packages/bcc/__init__.py", line 522, in load_func
> raise Exception("Failed to load BPF program %s: %s" %
> Exception: Failed to load BPF program b'do_perf_event': Invalid argument
>
> Signed-off-by: Yixun Lan <[email protected]>
Do you know what commit this fixes?
Thanks,
Conor.
> ---
> arch/riscv/Kconfig | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 32ffef9f6e5b4..da0016f1be6ce 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -25,6 +25,7 @@ config RISCV
> select ARCH_HAS_GIGANTIC_PAGE
> select ARCH_HAS_KCOV
> select ARCH_HAS_MMIOWB
> + select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
> select ARCH_HAS_PTE_SPECIAL
> select ARCH_HAS_SET_DIRECT_MAP if MMU
> select ARCH_HAS_SET_MEMORY if MMU
Hi Conor Dooley:
On 14:12 Sun 03 Jul , Conor Dooley wrote:
> On 03/07/2022 14:09, Yixun Lan wrote:
> > Enable this option to fix a bcc error in RISC-V platform
> >
> > And, the error shows as follows:
> >
> > ~ # runqlen
> > WARNING: This target JIT is not designed for the host you are running. \
> > If bad things happen, please choose a different -march switch.
> > bpf: Failed to load program: Invalid argument
> > 0: R1=ctx(off=0,imm=0) R10=fp0
> > 0: (85) call bpf_get_current_task#35 ; R0_w=scalar()
> > 1: (b7) r6 = 0 ; R6_w=0
> > 2: (7b) *(u64 *)(r10 -8) = r6 ; R6_w=P0 R10=fp0 fp-8_w=00000000
> > 3: (07) r0 += 312 ; R0_w=scalar()
> > 4: (bf) r1 = r10 ; R1_w=fp0 R10=fp0
> > 5: (07) r1 += -8 ; R1_w=fp-8
> > 6: (b7) r2 = 8 ; R2_w=8
> > 7: (bf) r3 = r0 ; R0_w=scalar(id=1) R3_w=scalar(id=1)
> > 8: (85) call bpf_probe_read#4
> > unknown func bpf_probe_read#4
> > processed 9 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0
> >
> > Traceback (most recent call last):
> > File "/usr/lib/python-exec/python3.9/runqlen", line 187, in <module>
> > b.attach_perf_event(ev_type=PerfType.SOFTWARE,
> > File "/usr/lib/python3.9/site-packages/bcc/__init__.py", line 1228, in attach_perf_event
> > fn = self.load_func(fn_name, BPF.PERF_EVENT)
> > File "/usr/lib/python3.9/site-packages/bcc/__init__.py", line 522, in load_func
> > raise Exception("Failed to load BPF program %s: %s" %
> > Exception: Failed to load BPF program b'do_perf_event': Invalid argument
> >
> > Signed-off-by: Yixun Lan <[email protected]>
>
> Do you know what commit this fixes?
> Thanks,
> Conor.
>
I think this is effectively broken for RISC-V 64 at the commit:
0ebeea8ca8a4: bpf: Restrict bpf_probe_read{, str}() only to archs where they work
However, the bcc tools haven't got BPF support for RISC-V at that time,
so no one noticed it
I can add a Fixes tag if you think it's a proper way
> > ---
> > arch/riscv/Kconfig | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> > index 32ffef9f6e5b4..da0016f1be6ce 100644
> > --- a/arch/riscv/Kconfig
> > +++ b/arch/riscv/Kconfig
> > @@ -25,6 +25,7 @@ config RISCV
> > select ARCH_HAS_GIGANTIC_PAGE
> > select ARCH_HAS_KCOV
> > select ARCH_HAS_MMIOWB
> > + select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
> > select ARCH_HAS_PTE_SPECIAL
> > select ARCH_HAS_SET_DIRECT_MAP if MMU
> > select ARCH_HAS_SET_MEMORY if MMU
--
Yixun Lan (dlan)
Gentoo Linux Developer
GPG Key ID AABEFD55