linux-kernel - [PATCH v3 4/7] powerpc: Add device-tree model to dump stack arch description

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Date:   Thu,  7 Feb 2019 23:46:32 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     linuxppc-dev@...abs.org
Cc:     akpm@...ux-foundation.org, tj@...nel.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        dyoung@...hat.com, sergey.senozhatsky@...il.com, pmladek@...e.com
Subject: [PATCH v3 4/7] powerpc: Add device-tree model to dump stack arch description

As soon as we know the model of the machine we're on, add it to the
dump stack arch description, which is printed in case of an oops.

eg: Hardware name: model:'IBM,8247-22L'

Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
---
 arch/powerpc/kernel/prom.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 38a90097469a..70af26a1eedd 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -34,6 +34,7 @@
 #include <linux/of_fdt.h>
 #include <linux/libfdt.h>
 #include <linux/cpu.h>
+#include <linux/printk.h>
 
 #include <asm/prom.h>
 #include <asm/rtas.h>
@@ -687,6 +688,23 @@ static void __init tm_init(void)
 static void tm_init(void) { }
 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
 
+static int __init
+early_init_dt_scan_model(unsigned long node, const char *uname,
+			 int depth, void *data)
+{
+	const char *prop;
+
+	if (depth != 0)
+		return 0;
+
+	prop = of_get_flat_dt_prop(node, "model", NULL);
+	if (prop)
+		dump_stack_add_arch_desc("model:'%s'", prop);
+
+	/* break now */
+	return 1;
+}
+
 void __init early_init_devtree(void *params)
 {
 	phys_addr_t limit;
@@ -697,6 +715,8 @@ void __init early_init_devtree(void *params)
 	if (!early_init_dt_verify(params))
 		panic("BUG: Failed verifying flat device tree, bad version?");
 
+	of_scan_flat_dt(early_init_dt_scan_model, NULL);
+
 #ifdef CONFIG_PPC_RTAS
 	/* Some machines might need RTAS info for debugging, grab it now. */
 	of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
-- 
2.20.1