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

Michael Ellerman
2019-02-07T12:46:32Z

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@ellerman.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