To aid in debugging kexec problems or when adding new functionality to
kexec add a new routine kexec_image_info() and several inline pr_debug
statements.
Signed-off-by: Geoff Levand <geoff at infradead.org>
---
arch/arm64/kernel/machine_kexec.c | 48 +++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/arch/arm64/kernel/machine_kexec.c b/arch/arm64/kernel/machine_kexec.c
index a6dcb9c..7372e58 100644
--- a/arch/arm64/kernel/machine_kexec.c
+++ b/arch/arm64/kernel/machine_kexec.c
@@ -11,6 +11,7 @@
#include <linux/kexec.h>
#include <linux/smp.h>
+#include <linux/uaccess.h>
#include <asm/cacheflush.h>
#include <asm/cpu_ops.h>
@@ -24,6 +25,32 @@ extern const unsigned long arm64_relocate_new_kernel_size;
static unsigned long kimage_start;
+/**
+ * kexec_image_info - For debugging output.
+ */
+#define kexec_image_info(_i) _kexec_image_info(__func__, __LINE__, _i)
+static void _kexec_image_info(const char *func, int line,
+ const struct kimage *kimage)
+{
+ unsigned long i;
+
+ pr_debug("%s:%d:\n", func, line);
+ pr_debug(" kexec kimage info:\n");
+ pr_debug(" type: %d\n", kimage->type);
+ pr_debug(" start: %lx\n", kimage->start);
+ pr_debug(" head: %lx\n", kimage->head);
+ pr_debug(" nr_segments: %lu\n", kimage->nr_segments);
+
+ for (i = 0; i < kimage->nr_segments; i++) {
+ pr_debug(" segment[%lu]: %016lx - %016lx, 0x%lx bytes, %lu pages\n",
+ i,
+ kimage->segment[i].mem,
+ kimage->segment[i].mem + kimage->segment[i].memsz,
+ kimage->segment[i].memsz,
+ kimage->segment[i].memsz / PAGE_SIZE);
+ }
+}
+
void machine_kexec_cleanup(struct kimage *kimage)
{
/* Empty routine needed to avoid build errors. */
@@ -40,6 +67,8 @@ int machine_kexec_prepare(struct kimage *kimage)
{
kimage_start = kimage->start;
+ kexec_image_info(kimage);
+
if (kimage->type != KEXEC_TYPE_CRASH) {
if (cpus_are_stuck_in_kernel()) {
pr_err("Can't kexec: failed CPUs are stuck in the kernel.\n");
@@ -137,6 +166,25 @@ void machine_kexec(struct kimage *kimage)
reboot_code_buffer_phys = page_to_phys(kimage->control_code_page);
reboot_code_buffer = phys_to_virt(reboot_code_buffer_phys);
+ kexec_image_info(kimage);
+
+ pr_debug("%s:%d: control_code_page: %p\n", __func__, __LINE__,
+ kimage->control_code_page);
+ pr_debug("%s:%d: reboot_code_buffer_phys: %pa\n", __func__, __LINE__,
+ &reboot_code_buffer_phys);
+ pr_debug("%s:%d: reboot_code_buffer: %p\n", __func__, __LINE__,
+ reboot_code_buffer);
+ pr_debug("%s:%d: relocate_new_kernel: %p\n", __func__, __LINE__,
+ arm64_relocate_new_kernel);
+ pr_debug("%s:%d: relocate_new_kernel_size: 0x%lx(%lu) bytes\n",
+ __func__, __LINE__, arm64_relocate_new_kernel_size,
+ arm64_relocate_new_kernel_size);
+
+ pr_debug("%s:%d: kimage_head: %lx\n", __func__, __LINE__,
+ kimage->head);
+ pr_debug("%s:%d: kimage_start: %lx\n", __func__, __LINE__,
+ kimage_start);
+
/*
* Copy arm64_relocate_new_kernel to the reboot_code_buffer for use
* after the kernel is shut down.
--
2.5.0
