Commit be5470e0 authored by Pingfan Liu's avatar Pingfan Liu Committed by Michael Ellerman

powerpc/crashkernel: Take "mem=" option into account

'mem=" option is an easy way to put high pressure on memory during
some test. Hence after applying the memory limit, instead of total
mem, the actual usable memory should be considered when reserving mem
for crashkernel. Otherwise the boot up may experience OOM issue.

E.g. it would reserve 4G prior to the change and 512M afterward, if
passing
crashkernel="2G-4G:384M,4G-16G:512M,16G-64G:1G,64G-128G:2G,128G-:4G",
and mem=5G on a 256G machine.

This issue is powerpc specific because it puts higher priority on
fadump and kdump reservation than on "mem=". Referring the following
code:
    if (fadump_reserve_mem() == 0)
            reserve_crashkernel();
    ...
    /* Ensure that total memory size is page-aligned. */
    limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE);
    memblock_enforce_memory_limit(limit);

While on other arches, the effect of "mem=" takes a higher priority
and pass through memblock_phys_mem_size() before calling
reserve_crashkernel().
Signed-off-by: default avatarPingfan Liu <kernelfans@gmail.com>
Reviewed-by: default avatarHari Bathini <hbathini@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1585749644-4148-1-git-send-email-kernelfans@gmail.com
parent ef3534a9
...@@ -115,11 +115,12 @@ void machine_kexec(struct kimage *image) ...@@ -115,11 +115,12 @@ void machine_kexec(struct kimage *image)
void __init reserve_crashkernel(void) void __init reserve_crashkernel(void)
{ {
unsigned long long crash_size, crash_base; unsigned long long crash_size, crash_base, total_mem_sz;
int ret; int ret;
total_mem_sz = memory_limit ? memory_limit : memblock_phys_mem_size();
/* use common parsing */ /* use common parsing */
ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), ret = parse_crashkernel(boot_command_line, total_mem_sz,
&crash_size, &crash_base); &crash_size, &crash_base);
if (ret == 0 && crash_size > 0) { if (ret == 0 && crash_size > 0) {
crashk_res.start = crash_base; crashk_res.start = crash_base;
...@@ -178,6 +179,7 @@ void __init reserve_crashkernel(void) ...@@ -178,6 +179,7 @@ void __init reserve_crashkernel(void)
/* Crash kernel trumps memory limit */ /* Crash kernel trumps memory limit */
if (memory_limit && memory_limit <= crashk_res.end) { if (memory_limit && memory_limit <= crashk_res.end) {
memory_limit = crashk_res.end + 1; memory_limit = crashk_res.end + 1;
total_mem_sz = memory_limit;
printk("Adjusted memory limit for crashkernel, now 0x%llx\n", printk("Adjusted memory limit for crashkernel, now 0x%llx\n",
memory_limit); memory_limit);
} }
...@@ -186,7 +188,7 @@ void __init reserve_crashkernel(void) ...@@ -186,7 +188,7 @@ void __init reserve_crashkernel(void)
"for crashkernel (System RAM: %ldMB)\n", "for crashkernel (System RAM: %ldMB)\n",
(unsigned long)(crash_size >> 20), (unsigned long)(crash_size >> 20),
(unsigned long)(crashk_res.start >> 20), (unsigned long)(crashk_res.start >> 20),
(unsigned long)(memblock_phys_mem_size() >> 20)); (unsigned long)(total_mem_sz >> 20));
if (!memblock_is_region_memory(crashk_res.start, crash_size) || if (!memblock_is_region_memory(crashk_res.start, crash_size) ||
memblock_reserve(crashk_res.start, crash_size)) { memblock_reserve(crashk_res.start, crash_size)) {
......
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