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| author | Hari Bathini <hbathini@linux.vnet.ibm.com> | 2017-06-01 22:51:26 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-06-28 13:08:09 +1000 |
| commit | eae0dfcc44320c79a05637534d59af4643b2ee7b (patch) | |
| tree | 0ba49c4ad13332234ad09dd34f339ac6ed839351 /arch/powerpc | |
| parent | a77af552ccc9d4d54459a39f9e5f7ad307aeb4f9 (diff) | |
| download | linux-eae0dfcc44320c79a05637534d59af4643b2ee7b.tar.bz2 | |
powerpc/fadump: avoid holes in boot memory area when fadump is registered
To register fadump, boot memory area - the size of low memory chunk that
is required for a kernel to boot successfully when booted with restricted
memory, is assumed to have no holes. But this memory area is currently
not protected from hot-remove operations. So, fadump could fail to
re-register after a memory hot-remove operation, if memory is removed
from boot memory area. To avoid this, ensure that memory from boot
memory area is not hot-removed when fadump is registered.
Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Reviewed-by: Mahesh J Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/include/asm/fadump.h | 1 | ||||
| -rw-r--r-- | arch/powerpc/kernel/fadump.c | 12 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/hotplug-memory.c | 7 |
3 files changed, 20 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/fadump.h b/arch/powerpc/include/asm/fadump.h index a3de219073af..ce88bbe1d809 100644 --- a/arch/powerpc/include/asm/fadump.h +++ b/arch/powerpc/include/asm/fadump.h @@ -203,6 +203,7 @@ struct fad_crash_memory_ranges { unsigned long long size; }; +extern int is_fadump_boot_memory_area(u64 addr, ulong size); extern int early_init_dt_scan_fw_dump(unsigned long node, const char *uname, int depth, void *data); extern int fadump_reserve_mem(void); diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c index 08e00448a355..750bff3b4af3 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -113,6 +113,18 @@ int __init early_init_dt_scan_fw_dump(unsigned long node, return 1; } +/* + * If fadump is registered, check if the memory provided + * falls within boot memory area. + */ +int is_fadump_boot_memory_area(u64 addr, ulong size) +{ + if (!fw_dump.dump_registered) + return 0; + + return (addr + size) > RMA_START && addr <= fw_dump.boot_memory_size; +} + int is_fadump_active(void) { return fw_dump.dump_active; diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c index e104c71ea44a..a186b8e8019a 100644 --- a/arch/powerpc/platforms/pseries/hotplug-memory.c +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c @@ -22,6 +22,7 @@ #include <asm/machdep.h> #include <asm/prom.h> #include <asm/sparsemem.h> +#include <asm/fadump.h> #include "pseries.h" static bool rtas_hp_event; @@ -406,6 +407,12 @@ static bool lmb_is_removable(struct of_drconf_cell *lmb) scns_per_block = block_sz / MIN_MEMORY_BLOCK_SIZE; phys_addr = lmb->base_addr; +#ifdef CONFIG_FA_DUMP + /* Don't hot-remove memory that falls in fadump boot memory area */ + if (is_fadump_boot_memory_area(phys_addr, block_sz)) + return false; +#endif + for (i = 0; i < scns_per_block; i++) { pfn = PFN_DOWN(phys_addr); if (!pfn_present(pfn)) |