Ryo Takakura f15c21a3de RISC-V: Enable IPI CPU Backtrace ... Add arch_trigger_cpumask_backtrace() which is a generic infrastructure for sampling other CPUs' backtrace using IPI. The feature is used when lockups are detected or in case of oops/panic if parameters are set accordingly. Below is the case of oops with the oops_all_cpu_backtrace enabled. $ sysctl kernel.oops_all_cpu_backtrace=1 triggering oops shows: [ 212.214237] NMI backtrace for cpu 1 [ 212.214390] CPU: 1 PID: 610 Comm: in:imklog Tainted: G OE 6.10.0-rc6 #1 [ 212.214570] Hardware name: riscv-virtio,qemu (DT) [ 212.214690] epc : fallback_scalar_usercopy+0x8/0xdc [ 212.214809] ra : _copy_to_user+0x20/0x40 [ 212.214913] epc : ffffffff80c3a930 ra : ffffffff8059ba7e sp : ff20000000eabb50 [ 212.215061] gp : ffffffff82066f90 tp : ff6000008e958000 t0 : 3463303866660000 [ 212.215210] t1 : 000000000000005b t2 : 3463303866666666 s0 : ff20000000eabb60 [ 212.215358] s1 : 0000000000000386 a0 : 00007ff6e81df926 a1 : ff600000824df800 [ 212.215505] a2 : 000000000000003f a3 : 7fffffffffffffc0 a4 : 0000000000000000 [ 212.215651] a5 : 000000000000003f a6 : 0000000000000000 a7 : 0000000000000000 [ 212.215857] s2 : ff600000824df800 s3 : ffffffff82066cc0 s4 : 0000000000001c1a [ 212.216074] s5 : ffffffff8206a5a8 s6 : 00007ff6e81df926 s7 : ffffffff8206a5a0 [ 212.216278] s8 : ff600000824df800 s9 : ffffffff81e25de0 s10: 000000000000003f [ 212.216471] s11: ffffffff8206a59d t3 : ff600000824df812 t4 : ff600000824df812 [ 212.216651] t5 : ff600000824df818 t6 : 0000000000040000 [ 212.216796] status: 0000000000040120 badaddr: 0000000000000000 cause: 8000000000000001 [ 212.217035] [<ffffffff80c3a930>] fallback_scalar_usercopy+0x8/0xdc [ 212.217207] [<ffffffff80095f56>] syslog_print+0x1f4/0x2b2 [ 212.217362] [<ffffffff80096e5c>] do_syslog.part.0+0x94/0x2d8 [ 212.217502] [<ffffffff800979e8>] do_syslog+0x66/0x88 [ 212.217636] [<ffffffff803a5dda>] kmsg_read+0x44/0x5c [ 212.217764] [<ffffffff80392dbe>] proc_reg_read+0x7a/0xa8 [ 212.217952] [<ffffffff802ff726>] vfs_read+0xb0/0x24e [ 212.218090] [<ffffffff803001ba>] ksys_read+0x64/0xe4 [ 212.218264] [<ffffffff8030025a>] __riscv_sys_read+0x20/0x2c [ 212.218453] [<ffffffff80c4af9a>] do_trap_ecall_u+0x60/0x1d4 [ 212.218664] [<ffffffff80c56998>] ret_from_exception+0x0/0x64 Signed-off-by: Ryo Takakura <takakura@valinux.co.jp> Link: https://lore.kernel.org/r/20240718093659.158912-1-takakura@valinux.co.jp Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>		2024-08-07 07:11:59 -07:00
..
compat_vdso	Makefile: remove redundant tool coverage variables	2024-05-14 23:35:48 +09:00
pi	RISC-V: Use Zkr to seed KASLR base address	2024-08-05 12:06:41 -07:00
probes	trace: riscv: Remove deprecated kprobe on ftrace support	2024-07-24 06:14:05 -07:00
tests	treewide: replace or remove redundant def_bool in Kconfig files	2024-02-20 20:47:45 +09:00
vdso	Makefile: remove redundant tool coverage variables	2024-05-14 23:35:48 +09:00
vendor_extensions	riscv: Extend cpufeature.c to detect vendor extensions	2024-07-22 15:36:54 -07:00
.gitignore	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
acpi_numa.c	ACPI: RISCV: Add NUMA support based on SRAT and SLIT	2024-07-22 07:13:06 -07:00
acpi.c	Merge patch "Enable SPCR table for console output on RISC-V"	2024-07-26 05:50:48 -07:00
alternative.c	riscv: errata: Rename defines for Andes	2024-03-12 07:13:12 -07:00
asm-offsets.c	ftrace: riscv: move from REGS to ARGS	2024-05-22 16:12:48 -07:00
cacheinfo.c	riscv: cacheinfo: initialize cacheinfo's level and type from ACPI PPTT	2024-07-24 07:39:36 -07:00
cfi.c	bpf, riscv64/cfi: Support kCFI + BPF on riscv64	2024-03-06 15:18:16 -08:00
compat_signal.c	riscv: compat: signal: Add rt_frame implementation	2022-05-17 16:37:21 -07:00
compat_syscall_table.c	riscv: convert to generic syscall table	2024-07-10 14:23:38 +02:00
copy-unaligned.h	RISC-V: Probe for unaligned access speed	2023-09-01 09:06:25 -07:00
copy-unaligned.S	riscv: Use SYM_*() assembly macros instead of deprecated ones	2023-11-06 09:42:47 -08:00
cpu_ops_sbi.c	riscv: prevent pt_regs corruption for secondary idle threads	2024-05-30 09:42:51 -07:00
cpu_ops_spinwait.c	riscv: prevent pt_regs corruption for secondary idle threads	2024-05-30 09:42:51 -07:00
cpu_ops.c	riscv: Use the same CPU operations for all CPUs	2024-01-04 15:03:07 -08:00
cpu-hotplug.c	riscv: Use the same CPU operations for all CPUs	2024-01-04 15:03:07 -08:00
cpu.c	riscv: Add vendor extensions to /proc/cpuinfo	2024-07-22 15:36:55 -07:00
cpufeature.c	riscv: Extend cpufeature.c to detect vendor extensions	2024-07-22 15:36:54 -07:00
crash_dump.c	vmcore: convert copy_oldmem_page() to take an iov_iter	2022-04-29 14:37:59 -07:00
crash_save_regs.S	RISC-V: Fixup get incorrect user mode PC for kernel mode regs	2022-08-11 08:54:40 -07:00
efi-header.S	riscv: Prepare EFI header for relocatable kernels	2023-04-19 07:46:28 -07:00
efi.c	riscv: Use accessors to page table entries instead of direct dereference	2023-12-20 10:48:15 -08:00
elf_kexec.c	fix missing vmalloc.h includes	2024-04-25 20:55:49 -07:00
entry.S	riscv: enable HAVE_ARCH_STACKLEAK	2024-07-26 05:50:47 -07:00
fpu.S	riscv: typo in comment for get_f64_reg	2024-05-22 16:12:53 -07:00
ftrace.c	riscv: patch: Flush the icache right after patching to avoid illegal insns	2024-06-26 07:37:27 -07:00
head.h	riscv: entry: Convert to generic entry	2023-03-23 08:47:00 -07:00
head.S	riscv: set trap vector earlier	2024-07-12 08:55:31 -07:00
hibernate-asm.S	riscv: Use SYM_*() assembly macros instead of deprecated ones	2023-11-06 09:42:47 -08:00
hibernate.c	riscv: hibernate: remove WARN_ON in save_processor_state	2023-06-23 10:06:22 -07:00
image-vars.h	efi: move screen_info into efi init code	2023-10-17 16:33:39 +02:00
irq.c	Merge patch "drivers: perf: Do not broadcast to other cpus when starting a counter"	2023-11-09 06:44:13 -08:00
jump_label.c	riscv: jump_label: Batch icache maintenance	2024-06-26 07:36:27 -07:00
kernel_mode_fpu.c	riscv: add support for kernel-mode FPU	2024-05-19 14:36:19 -07:00
kernel_mode_vector.c	riscv: vector: allow kernel-mode Vector with preemption	2024-01-16 07:14:02 -08:00
kexec_relocate.S	riscv: kexec: Cleanup riscv_kexec_relocate	2023-09-20 02:53:29 -07:00
kgdb.c	RISC-V: rename parse_asm.h to insn.h	2022-12-29 06:59:47 -08:00
machine_kexec_file.c	RISC-V: Add kexec_file support	2022-05-19 12:14:18 -07:00
machine_kexec.c	riscv: kexec: Avoid deadlock in kexec crash path	2024-07-03 13:11:30 -07:00
Makefile	Merge patch series "riscv: Separate vendor extensions from standard extensions"	2024-07-22 15:37:01 -07:00
Makefile.syscalls	riscv: convert to generic syscall table	2024-07-10 14:23:38 +02:00
mcount-dyn.S	ftrace: riscv: move from REGS to ARGS	2024-05-22 16:12:48 -07:00
mcount.S	riscv: remove MCOUNT_NAME workaround	2024-02-22 15:38:54 -08:00
module-sections.c	riscv: add missing header file includes	2019-10-28 00:46:01 -07:00
module.c	arch: make execmem setup available regardless of CONFIG_MODULES	2024-05-14 00:31:44 -07:00
paravirt.c	RISC-V: KVM: Rename the SBI_STA_SHMEM_DISABLE to a generic name	2024-04-22 11:13:52 +05:30
patch.c	RISC-V Patches for the 6.11 Merge Window, Part 1	2024-07-20 09:11:27 -07:00
perf_callchain.c	riscv: Fix fill_callchain return value	2022-03-30 23:01:42 -07:00
perf_regs.c	perf/arch: Remove perf_sample_data::regs_user_copy	2020-11-09 18:12:34 +01:00
process.c	riscv: process: Fix kernel gp leakage	2024-04-04 12:35:05 -07:00
ptrace.c	Merge patch series "riscv: Introduce compat-mode helpers & improve arch_get_mmap_end()"	2024-03-20 08:56:05 -07:00
reset.c	riscv: Use do_kernel_power_off()	2022-05-19 19:30:30 +02:00
return_address.c	riscv: add CALLER_ADDRx support	2024-02-22 12:17:47 -08:00
riscv_ksyms.c	RISC-V: add infrastructure to allow different str* implementations	2023-01-31 11:43:23 -08:00
sbi-ipi.c	riscv: Use IPIs for remote cache/TLB flushes by default	2024-04-29 10:49:26 -07:00
sbi.c	riscv: Improve sbi_ecall() code generation by reordering arguments	2024-07-10 13:30:56 -07:00
setup.c	ACPI: RISCV: Add NUMA support based on SRAT and SLIT	2024-07-22 07:13:06 -07:00
signal.c	riscv: signal: Remove unlikely() from WARN_ON() condition	2024-07-26 05:50:46 -07:00
smp.c	RISC-V: Enable IPI CPU Backtrace	2024-08-07 07:11:59 -07:00
smpboot.c	Merge patch series "Add ACPI NUMA support for RISC-V"	2024-07-22 10:31:51 -07:00
soc.c	riscv: Fix builtin DTB handling	2021-01-07 19:00:50 -08:00
stacktrace.c	riscv: Improve exception and system call latency	2024-07-26 05:50:45 -07:00
suspend_entry.S	riscv: Use SYM_*() assembly macros instead of deprecated ones	2023-11-06 09:42:47 -08:00
suspend.c	riscv: Do not save the scratch CSR during suspend	2024-04-28 14:50:36 -07:00
sys_hwprobe.c	RISC-V: Provide the frequency of time CSR via hwprobe	2024-07-26 05:50:51 -07:00
sys_riscv.c	syscalls: mmap(): use unsigned offset type consistently	2024-06-25 15:57:38 +02:00
syscall_table.c	riscv: convert to generic syscall table	2024-07-10 14:23:38 +02:00
time.c	RISC-V: paravirt: Add skeleton for pv-time support	2023-12-30 11:25:03 +05:30
traps_misaligned.c	riscv: misaligned: remove CONFIG_RISCV_M_MODE specific code	2024-04-28 14:50:37 -07:00
traps.c	riscv: use KERN_INFO in do_trap	2024-04-04 12:12:14 -07:00
unaligned_access_speed.c	riscv: Use kcalloc() instead of kzalloc()	2024-03-20 08:56:07 -07:00
vdso.c	riscv: vdso: Use generic union vdso_data_store	2024-02-20 20:56:00 +01:00
vector.c	riscv: vector: adjust minimum Vector requirement to ZVE32X	2024-05-30 14:33:10 -07:00
vendor_extensions.c	riscv: Extend cpufeature.c to detect vendor extensions	2024-07-22 15:36:54 -07:00
vmcore_info.c	crash: split vmcoreinfo exporting code out from crash_core.c	2024-02-23 17:48:22 -08:00
vmlinux-xip.lds.S	riscv: Check if the code to patch lies in the exit section	2024-01-09 10:58:59 -08:00
vmlinux.lds.S	riscv: Check if the code to patch lies in the exit section	2024-01-09 10:58:59 -08:00