[v3,3/4] arm: Add kexec_image_info

Commit Message

Lukasz Stelmach Sept. 30, 2020, 6:34 p.m. UTC

Add kexec_image_info to print detailed information about a kexec image.

Signed-off-by: Łukasz Stelmach <[e-mail]>
---
 arch/arm/kernel/machine_kexec.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

Patch

diff --git a/arch/arm/kernel/machine_kexec.c b/arch/arm/kernel/machine_kexec.c
index 5d84ad333f05..a0c229eec0b2 100644
--- a/arch/arm/kernel/machine_kexec.c
+++ b/arch/arm/kernel/machine_kexec.c
@@ -29,6 +29,32 @@  extern unsigned long kexec_boot_atags;
 
 static atomic_t waiting_for_crash_ipi;
 
+/**
+ * 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]: %08lx - %08lx, 0x%x 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);
+	}
+}
+
 /*
  * Provide a dummy crash_notes definition while crash dump arrives to arm.
  * This prevents breakage of crash_notes attribute in kernel/ksysfs.c.
@@ -40,6 +66,8 @@  int machine_kexec_prepare(struct kimage *image)
 	__be32 header;
 	int i, err;
 
+	kexec_image_info(image);
+
 	image->arch.kernel_r2 = image->start - KEXEC_ARM_ZIMAGE_OFFSET
 				     + KEXEC_ARM_ATAGS_OFFSET;