/*
* reserve_crashkernel() - reserves memory for crash kernel
*
* This function reserves memory area given in "crashkernel=" kernel command
* line parameter. The memory reserved is used by dump capture kernel when
* primary kernel is crashing.
*/
static void __init reserve_crashkernel(void)
{
unsigned long long crash_base, crash_size;
int ret;
ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
&crash_size, &crash_base);
/* no crashkernel= or invalid value specified */
if (ret || !crash_size)
return;
crash_size = PAGE_ALIGN(crash_size);
if (crash_base == 0) {
/* Current arm64 boot protocol requires 2MB alignment */
crash_base = memblock_find_in_range(0, ARCH_LOW_ADDRESS_LIMIT,
crash_size, SZ_2M);
if (crash_base == 0) {
pr_warn("cannot allocate crashkernel (size:0x%llx)\n",
crash_size);
return;
}
} else {
/* User specifies base address explicitly. */
if (!memblock_is_region_memory(crash_base, crash_size)) {
pr_warn("cannot reserve crashkernel: region is not memory\n");
return;
}
if (memblock_is_region_reserved(crash_base, crash_size)) {
pr_warn("cannot reserve crashkernel: region overlaps reserved memory\n");
return;
}
if (!IS_ALIGNED(crash_base, SZ_2M)) {
pr_warn("cannot reserve crashkernel: base address is not 2MB aligned\n");
return;
}
}
memblock_reserve(crash_base, crash_size);
pr_info("crashkernel reserved: 0x%016llx - 0x%016llx (%lld MB)\n",
crash_base, crash_base + crash_size, crash_size >> 20);
crashk_res.start = crash_base;
crashk_res.end = crash_base + crash_size - 1;
}
/*
* Reserve memory for kdump kernel to be loaded with kexec
*/
static void __init reserve_crashkernel(void)
{
#ifdef CONFIG_CRASH_DUMP
unsigned long long crash_base, crash_size;
char *msg;
int rc;
rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
&crash_base);
if (rc || crash_size == 0)
return;
crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
if (register_memory_notifier(&kdump_mem_nb))
return;
if (!crash_base)
crash_base = find_crash_base(crash_size, &msg);
if (!crash_base) {
pr_info("crashkernel reservation failed: %s\n", msg);
unregister_memory_notifier(&kdump_mem_nb);
return;
}
if (verify_crash_base(crash_base, crash_size, &msg)) {
pr_info("crashkernel reservation failed: %s\n", msg);
unregister_memory_notifier(&kdump_mem_nb);
return;
}
if (!OLDMEM_BASE && MACHINE_IS_VM)
diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
crashk_res.start = crash_base;
crashk_res.end = crash_base + crash_size - 1;
insert_resource(&iomem_resource, &crashk_res);
reserve_kdump_bootmem(crash_base, crash_size, CHUNK_CRASHK);
pr_info("Reserving %lluMB of memory at %lluMB "
"for crashkernel (System RAM: %luMB)\n",
crash_size >> 20, crash_base >> 20, memory_end >> 20);
#endif
}
/*
* reserve_crashkernel() - reserves memory for crash kernel
*
* This function reserves memory area given in "crashkernel=" kernel command
* line parameter. The memory reserved is used by a dump capture kernel when
* primary kernel is crashing.
*/
static void __init reserve_crashkernel(phys_addr_t limit)
{
unsigned long long crash_size = 0, crash_base = 0;
int ret;
ret = parse_crashkernel(boot_command_line, limit,
&crash_size, &crash_base);
if (ret)
return;
if (crash_base == 0) {
crash_base = memblock_alloc(crash_size, 1 << 20);
if (crash_base == 0) {
pr_warn("crashkernel allocation failed (size:%llx)\n",
crash_size);
return;
}
} else {
/* User specifies base address explicitly. Sanity check */
if (!memblock_is_region_memory(crash_base, crash_size) ||
memblock_is_region_reserved(crash_base, crash_size)) {
pr_warn("crashkernel= has wrong address or size\n");
return;
}
if (memblock_reserve(crash_base, crash_size)) {
pr_warn("crashkernel reservation failed - out of memory\n");
return;
}
}
pr_info("Reserving %lldMB of memory at %lldMB for crashkernel\n",
crash_size >> 20, crash_base >> 20);
crashk_res.start = crash_base;
crashk_res.end = crash_base + crash_size - 1;
}