From: Chen Zhou <chenzhou10@xxxxxxxxxx>
Introduce macro CRASH_ALIGN for alignment, macro CRASH_ADDR_LOW_MAX
for upper bound of low crash memory, macro CRASH_ADDR_HIGH_MAX for
upper bound of high crash memory, use macros instead.
Besides, keep consistent with x86, use CRASH_ALIGN as the lower bound
of crash kernel reservation.
Signed-off-by: Chen Zhou <chenzhou10@xxxxxxxxxx>
Tested-by: John Donnelly <John.p.donnelly@xxxxxxxxxx>
---
arch/arm64/include/asm/kexec.h | 6 ++++++
arch/arm64/mm/init.c | 4 ++--
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/include/asm/kexec.h b/arch/arm64/include/asm/kexec.h
index 00dbcc71aeb2918..b51ceb143cbbdb0 100644
--- a/arch/arm64/include/asm/kexec.h
+++ b/arch/arm64/include/asm/kexec.h
@@ -25,6 +25,12 @@
#define KEXEC_ARCH KEXEC_ARCH_AARCH64
+/* 2M alignment for crash kernel regions */
+#define CRASH_ALIGN SZ_2M
+
+#define CRASH_ADDR_LOW_MAX arm64_dma_phys_limit
+#define CRASH_ADDR_HIGH_MAX MEMBLOCK_ALLOC_ACCESSIBLE
+
#ifndef __ASSEMBLY__
/**
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 37a81754d9b61f7..2c94ae13b160834 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -75,7 +75,7 @@ phys_addr_t arm64_dma_phys_limit __ro_after_init;
static void __init reserve_crashkernel(void)
{
unsigned long long crash_base, crash_size;
- unsigned long long crash_max = arm64_dma_phys_limit;
+ unsigned long long crash_max = CRASH_ADDR_LOW_MAX;
int ret;
ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
@@ -91,7 +91,7 @@ static void __init reserve_crashkernel(void)
crash_max = crash_base + crash_size;
/* Current arm64 boot protocol requires 2MB alignment */
- crash_base = memblock_phys_alloc_range(crash_size, SZ_2M,
+ crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
crash_base, crash_max);
if (!crash_base) {
pr_warn("cannot allocate crashkernel (size:0x%llx)\n",
--
2.25.1
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