diff options
| author | Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> | 2018-08-20 13:47:32 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-12-21 11:32:49 +1100 |
| commit | 0db6896ff6332ba694f1e61b93ae3b2640317633 (patch) | |
| tree | 90958ad084f82e8e72757071fd6387ab22fdd471 /arch/powerpc/kernel/fadump.c | |
| parent | f86593be1e7f5405b980bb4b11640250ac81d7cb (diff) | |
| download | linux-0db6896ff6332ba694f1e61b93ae3b2640317633.tar.bz2 | |
powerpc/fadump: Do not allow hot-remove memory from fadump reserved area.
For fadump to work successfully there should not be any holes in reserved
memory ranges where kernel has asked firmware to move the content of old
kernel memory in event of crash. Now that fadump uses CMA for reserved
area, this memory area is now not protected from hot-remove operations
unless it is cma allocated. Hence, fadump service can fail to re-register
after the hot-remove operation, if hot-removed memory belongs to fadump
reserved region. To avoid this make sure that memory from fadump reserved
area is not hot-removable if fadump is registered.
However, if user still wants to remove that memory, he can do so by
manually stopping fadump service before hot-remove operation.
Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/fadump.c')
| -rw-r--r-- | arch/powerpc/kernel/fadump.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c index b7f83d6eb697..45a8d0be1c96 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -183,13 +183,19 @@ int __init early_init_dt_scan_fw_dump(unsigned long node, /* * If fadump is registered, check if the memory provided - * falls within boot memory area. + * falls within boot memory area and reserved memory area. */ -int is_fadump_boot_memory_area(u64 addr, ulong size) +int is_fadump_memory_area(u64 addr, ulong size) { + u64 d_start = fw_dump.reserve_dump_area_start; + u64 d_end = d_start + fw_dump.reserve_dump_area_size; + if (!fw_dump.dump_registered) return 0; + if (((addr + size) > d_start) && (addr <= d_end)) + return 1; + return (addr + size) > RMA_START && addr <= fw_dump.boot_memory_size; } |