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

[Kefeng Wang]

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
-- 
2.26.2