[PATCH 0/8] Support RISCV64 arch and common commands

[Guo Ren]

Great Job. After two years, we finally have crash ready to use.

Tested-by: Guo Ren <guoren at kernel.org>

On Sun, Jul 17, 2022 at 12:29 PM Xianting Tian
<xianting.tian at linux.alibaba.com> wrote:
>
> This series of patches make crash tool support RISCV64 arch and the common
> commands(*, bt, p, rd, mod, log, set, struct, task, dis and so on).
>
> To make the crash tool work normally for RISCV64 arch, we need a Linux kernel
> patch(under reviewing), which exports the kernel virtual memory layout, va_bits,
> phys_ram_base to vmcoreinfo, it can simplify the development of crash tool.
>
> THis Linux kernel patch:
> https://patchwork.kernel.org/project/linux-riscv/patch/20220714113300.367854-2-xianting.tian@linux.alibaba.com/
>
> This series of patches are tested on QEMU RISCV64 env and SoC platform of
> T-head Xuantie 910 CPU.
>
> ====================================
>   Some test examples list as below
> ====================================
> ... ...
>       KERNEL: vmlinux
>     DUMPFILE: vmcore
>         CPUS: 1
>         DATE: Fri Jul 15 10:24:25 CST 2022
>       UPTIME: 00:00:33
> LOAD AVERAGE: 0.05, 0.01, 0.00
>        TASKS: 41
>     NODENAME: buildroot
>      RELEASE: 5.18.9
>      VERSION: #30 SMP Fri Jul 15 09:47:03 CST 2022
>      MACHINE: riscv64  (unknown Mhz)
>       MEMORY: 1 GB
>        PANIC: "Kernel panic - not syncing: sysrq triggered crash"
>          PID: 113
>      COMMAND: "sh"
>         TASK: ff60000002269600  [THREAD_INFO: ff60000002269600]
>          CPU: 0
>        STATE: TASK_RUNNING (PANIC)
>
> carsh>
>
> crash> p mem_map
> mem_map = $1 = (struct page *) 0xff6000003effbf00
>
> crash> p /x *(struct page *) 0xff6000003effbf00
> $5 = {
>   flags = 0x1000,
>   {
>     {
>       {
>         lru = {
>           next = 0xff6000003effbf08,
>           prev = 0xff6000003effbf08
>         },
>         {
>           __filler = 0xff6000003effbf08,
>           mlock_count = 0x3effbf08
>         }
>       },
>       mapping = 0x0,
>       index = 0x0,
>       private = 0x0
>     },
>   ... ...
>
> crash> mod
>      MODULE       NAME             BASE         SIZE  OBJECT FILE
> ffffffff0113e740  nvme_core  ffffffff01133000  98304  (not loaded)  [CONFIG_KALLSYMS]
> ffffffff011542c0  nvme       ffffffff0114c000  61440  (not loaded)  [CONFIG_KALLSYMS]
>
> crash> rd ffffffff0113e740 8
> ffffffff0113e740:  0000000000000000 ffffffff810874f8   .........t......
> ffffffff0113e750:  ffffffff011542c8 726f635f656d766e   .B......nvme_cor
> ffffffff0113e760:  0000000000000065 0000000000000000   e...............
> ffffffff0113e770:  0000000000000000 0000000000000000   ................
>
> crash> vtop ffffffff0113e740
> VIRTUAL           PHYSICAL
> ffffffff0113e740  8254d740
>
>    PGD: ffffffff810e9ff8 => 2ffff001
>   P4D: 0000000000000000 => 000000002fffec01
>   PUD: 00005605c2957470 => 0000000020949801
>   PMD: 00007fff7f1750c0 => 0000000020947401
>    PTE: 0 => 209534e7
>  PAGE: 000000008254d000
>
>   PTE     PHYSICAL  FLAGS
> 209534e7  8254d000  (PRESENT|READ|WRITE|GLOBAL|ACCESSED|DIRTY)
>
>       PAGE       PHYSICAL      MAPPING       INDEX CNT FLAGS
> ff6000003f0777d8 8254d000                0        0  1 0
>
> crash> bt
> PID: 113      TASK: ff6000000226c200  CPU: 0    COMMAND: "sh"
>  #0 [ff20000010333b90] riscv_crash_save_regs at ffffffff800078f8
>  #1 [ff20000010333cf0] panic at ffffffff806578c6
>  #2 [ff20000010333d50] sysrq_reset_seq_param_set at ffffffff8038c03c
>  #3 [ff20000010333da0] __handle_sysrq at ffffffff8038c604
>  #4 [ff20000010333e00] write_sysrq_trigger at ffffffff8038cae4
>  #5 [ff20000010333e20] proc_reg_write at ffffffff801b7ee8
>  #6 [ff20000010333e40] vfs_write at ffffffff80152bb2
>  #7 [ff20000010333e80] ksys_write at ffffffff80152eda
>  #8 [ff20000010333ed0] sys_write at ffffffff80152f52
>
> Xianting Tian (8):
>   Add RISCV64 framework code support
>   RISCV64: Make crash tool enter command line and support some commands
>   RISCV64: Add 'dis' command support
>   RISCV64: Add 'irq' command support
>   RISCV64: Add 'bt' command support
>   RISCV64: Add 'help -r' command support
>   RISCV64: Add 'mach' command support
>   RISCV64: Add the implementation of symbol verify
>
>  Makefile            |    7 +-
>  README              |    2 +-
>  configure.c         |   39 +-
>  defs.h              |  248 +++++++-
>  diskdump.c          |   21 +-
>  help.c              |    2 +-
>  lkcd_vmdump_v2_v3.h |    2 +-
>  netdump.c           |   22 +-
>  ramdump.c           |    2 +
>  riscv64.c           | 1414 +++++++++++++++++++++++++++++++++++++++++++
>  symbols.c           |   10 +
>  11 files changed, 1759 insertions(+), 10 deletions(-)
>  create mode 100644 riscv64.c
>
> --
> 2.17.1
>


-- 
Best Regards
 Guo Ren