[PATCH] riscv: Add machine name to kernel boot log and stack dump output

[Kefeng Wang]

Hi Palmer,  kindly ping..

On 2020/11/25 19:44, Kefeng Wang wrote:
> Add the machine name to kernel boot-up log, and install
> the machine name to stack dump for DT boot mode.
>
> Signed-off-by: Kefeng Wang <wangkefeng.wang at huawei.com>
> ---
>
> Here is the message after patched,
>
> root@(none):~# dmesg |grep "Machine model"
> [    0.000000] Machine model: riscv-virtio,qemu
>
> root@(none):~# echo c > /proc/sysrq-trigger
> [ 1519.475346] sysrq: Trigger a crash
> [ 1519.476004] Kernel panic - not syncing: sysrq triggered crash
> [ 1519.476480] CPU: 0 PID: 64 Comm: sh Not tainted 5.10.0-rc5 #246
> [ 1519.476877] Hardware name: riscv-virtio,qemu (DT)
> [ 1519.477169] Call Trace:
> ...
>
>   arch/riscv/kernel/setup.c | 9 ++++++++-
>   1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> index c424cc6dd833..901ac0c680dd 100644
> --- a/arch/riscv/kernel/setup.c
> +++ b/arch/riscv/kernel/setup.c
> @@ -54,8 +54,15 @@ static DEFINE_PER_CPU(struct cpu, cpu_devices);
>   static void __init parse_dtb(void)
>   {
>   	/* Early scan of device tree from init memory */
> -	if (early_init_dt_scan(dtb_early_va))
> +	if (early_init_dt_scan(dtb_early_va)) {
> +		const char *name = of_flat_dt_get_machine_name();
> +
> +		if (name) {
> +			pr_info("Machine model: %s\n", name);
> +			dump_stack_set_arch_desc("%s (DT)", name);
> +		}
>   		return;
> +	}
>   
>   	pr_err("No DTB passed to the kernel\n");
>   #ifdef CONFIG_CMDLINE_FORCE