There are two methods to specify the location of the elf core header:
using the "elfcorehdr=" kernel parameter, as handled by generic code in
kernel/crash_dump.c, or using the "linux,elfcorehdr" property under the
"/chosen" node in the Device Tree, as handled by architecture-specific
code in arch/arm64/mm/init.c.

Extend support for "linux,elfcorehdr" to all platforms supporting DT by
adding platform-agnostic handling for parsing this property to the FDT
core code.  This can co-exist safely with the architecture-specific
handling, until the latter has been removed.

This requires moving the call to of_scan_flat_dt() up, as the code
scanning the "/chosen" node now needs to be aware of the values of
"#address-cells" and "#size-cells".

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 Documentation/devicetree/bindings/chosen.txt |  6 ++--
 drivers/of/fdt.c                             | 37 ++++++++++++++++++--
 2 files changed, 37 insertions(+), 6 deletions(-)

diff --git a/Documentation/devicetree/bindings/chosen.txt b/Documentation/devicetree/bindings/chosen.txt
index 45e79172a646c537..5b0b94eb2d04e79d 100644
--- a/Documentation/devicetree/bindings/chosen.txt
+++ b/Documentation/devicetree/bindings/chosen.txt

@@ -106,9 +106,9 @@ respectively, of the root node.
 linux,elfcorehdr
 ----------------

-This property (currently used only on arm64) holds the memory range,
-the address and the size, of the elf core header which mainly describes
-the panicked kernel's memory layout as PT_LOAD segments of elf format.
+This property holds the memory range, the address and the size, of the elf
+core header which mainly describes the panicked kernel's memory layout as
+PT_LOAD segments of elf format.
 e.g.

 / {

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index a03d43f95495d8e1..f13db831c8028cce 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c

@@ -8,6 +8,7 @@

 #define pr_fmt(fmt)    "OF: fdt: " fmt

+#include <linux/crash_dump.h>
 #include <linux/crc32.h>
 #include <linux/kernel.h>
 #include <linux/initrd.h>

@@ -909,6 +910,35 @@ static inline void early_init_dt_check_for_initrd(unsigned long node)
 }
 #endif /* CONFIG_BLK_DEV_INITRD */

+#ifdef CONFIG_CRASH_DUMP
+/**
+ * early_init_dt_check_for_elfcorehdr - Decode elfcorehdr location from flat
+ * tree
+ * @node: reference to node containing elfcorehdr location ('chosen')
+ */
+static void __init early_init_dt_check_for_elfcorehdr(unsigned long node)
+{
+       const __be32 *prop;
+       int len;
+
+       pr_debug("Looking for elfcorehdr property... ");
+
+       prop = of_get_flat_dt_prop(node, "linux,elfcorehdr", &len);
+       if (!prop || (len < (dt_root_addr_cells + dt_root_size_cells)))
+               return;
+
+       elfcorehdr_addr = dt_mem_next_cell(dt_root_addr_cells, &prop);
+       elfcorehdr_size = dt_mem_next_cell(dt_root_size_cells, &prop);

+
+       pr_debug("elfcorehdr_start=0x%llx elfcorehdr_size=0x%llx\n",
+                elfcorehdr_addr, elfcorehdr_size);
+}
+#else
+static inline void early_init_dt_check_for_elfcorehdr(unsigned long node)
+{
+}
+#endif
+
 #ifdef CONFIG_SERIAL_EARLYCON

 int __init early_init_dt_scan_chosen_stdout(void)

@@ -1057,6 +1087,7 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
                return 0;

        early_init_dt_check_for_initrd(node);
+       early_init_dt_check_for_elfcorehdr(node);

        /* Retrieve command line */
        p = of_get_flat_dt_prop(node, "bootargs", &l);

@@ -1201,14 +1232,14 @@ void __init early_init_dt_scan_nodes(void)
 {
        int rc = 0;

+       /* Initialize {size,address}-cells info */
+       of_scan_flat_dt(early_init_dt_scan_root, NULL);
+
        /* Retrieve various information from the /chosen node */
        rc = of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
        if (!rc)
                pr_warn("No chosen node found, continuing without\n");

-       /* Initialize {size,address}-cells info */
-       of_scan_flat_dt(early_init_dt_scan_root, NULL);
-
        /* Setup memory, calling early_init_dt_add_memory_arch */
        of_scan_flat_dt(early_init_dt_scan_memory, NULL);
 }
--

2.25.1