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powerpc/fadump: make use of memblock's bottom up allocation mode 

Earlier, memblock_find_in_range() was not used to find the memory to
be reserved for FADump as bottom up allocation mode was not supported.
But since commit 79442ed189 ("mm/memblock.c: introduce bottom-up
allocation mode") bottom up allocation mode is supported for memblock.
So, use it to find the memory to be reserved for FADump.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/156821364211.5656.14336025460336135194.stgit@hbathini.in.ibm.com
This commit is contained in:
Hari Bathini 2019-09-11 20:24:28 +05:30 committed by Michael Ellerman
parent fbcafdaea2
commit 579ca1a276
1 changed files with 12 additions and 14 deletions
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26
arch/powerpc/kernel/fadump.c
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@ -342,7 +342,8 @@ static void __init fadump_reserve_crash_area(unsigned long base,
int __init fadump_reserve_mem(void)
{
u64 base, size, mem_boundary;
bool is_memblock_bottom_up = memblock_bottom_up();
u64 base, size, mem_boundary, align = PAGE_SIZE;
int ret = 1;
if (!fw_dump.fadump_enabled)
@ -362,10 +363,11 @@ int __init fadump_reserve_mem(void)
fw_dump.boot_memory_size =
PAGE_ALIGN(fadump_calculate_reserve_size());
#ifdef CONFIG_CMA
if (!fw_dump.nocma)
if (!fw_dump.nocma) {
align = FADUMP_CMA_ALIGNMENT;
fw_dump.boot_memory_size =
ALIGN(fw_dump.boot_memory_size,
FADUMP_CMA_ALIGNMENT);
ALIGN(fw_dump.boot_memory_size, align);
}
#endif
}
@ -419,19 +421,15 @@ int __init fadump_reserve_mem(void)
} else {
/*
* Reserve memory at an offset closer to bottom of the RAM to
* minimize the impact of memory hot-remove operation. We can't
* use memblock_find_in_range() here since it doesn't allocate
* from bottom to top.
* minimize the impact of memory hot-remove operation.
*/
while (base <= (mem_boundary - size)) {
if (memblock_is_region_memory(base, size) &&
!memblock_is_region_reserved(base, size))
break;
memblock_set_bottom_up(true);
base = memblock_find_in_range(base, mem_boundary, size, align);
base += size;
}
/* Restore the previous allocation mode */
memblock_set_bottom_up(is_memblock_bottom_up);
if (base > (mem_boundary - size)) {
if (!base) {
pr_err("Failed to find memory chunk for reservation!\n");
goto error_out;
}