[PATCH 6/6] powerpc/pseries: Add firmware details to dump stack arch description

[Michael Ellerman]

Add firmware version details to the dump stack arch description, which
is printed in case of an oops.

Currently /hypervisor only exists on KVM, so if we don't find that
look for something that suggests we're on phyp and if so that's
probably a good guess. The actual content of the ibm,fw-net-version
seems to be a full path so is too long to add to the description.

eg: Hardware name: ... of:'IBM,FW860.42 (SV860_138)' hv:phyp

Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
---
 arch/powerpc/platforms/pseries/setup.c | 36 ++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 5e44c65a032c..f0ce8256ebb8 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -41,6 +41,7 @@
 #include <linux/of_pci.h>
 #include <linux/memblock.h>
 #include <linux/swiotlb.h>
+#include <linux/seq_buf.h>
 
 #include <asm/mmu.h>
 #include <asm/processor.h>
@@ -1011,6 +1012,39 @@ static void __init pSeries_cmo_feature_init(void)
 	pr_debug(" <- fw_cmo_feature_init()\n");
 }
 
+static void __init pseries_add_dump_stack_arch_desc(void)
+{
+	struct device_node *dn;
+	const char *prop;
+
+	dn = of_find_node_by_path("/openprom");
+	if (dn) {
+		prop = of_get_property(dn, "model", NULL);
+		if (prop)
+			seq_buf_printf(&ppc_hw_desc, "of:'%s' ", prop);
+
+		of_node_put(dn);
+	}
+
+	dn = of_find_node_by_path("/hypervisor");
+	if (dn) {
+		prop = of_get_property(dn, "compatible", NULL);
+		if (prop)
+			seq_buf_printf(&ppc_hw_desc, "hv:%s ", prop);
+
+		of_node_put(dn);
+	} else {
+		dn = of_find_node_by_path("/");
+		if (dn) {
+			prop = of_get_property(dn, "ibm,fw-net-version", NULL);
+			if (prop)
+				seq_buf_printf(&ppc_hw_desc, "hv:phyp ");
+
+			of_node_put(dn);
+		}
+	}
+}
+
 /*
  * Early initialization.  Relocation is on but do not reference unbolted pages
  */
@@ -1018,6 +1052,8 @@ static void __init pseries_init(void)
 {
 	pr_debug(" -> pseries_init()\n");
 
+	pseries_add_dump_stack_arch_desc();
+
 #ifdef CONFIG_HVC_CONSOLE
 	if (firmware_has_feature(FW_FEATURE_LPAR))
 		hvc_vio_init_early();
-- 
2.37.3