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arm64: Honor limits set by boot parameter

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Consider the memory limit enforced by boot parameter and
restrict adding beyond this boundary during a memory hotplug.

Change-Id: Ibd13e47ee13004381a1ddff649150fae13429c87
Signed-off-by: Vijayanand Jitta <vjitta@codeaurora.org>
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
This commit is contained in:
Vijayanand Jitta 2019-10-16 13:02:18 +05:30 • committed by Isaac J. Manjarres
commit cdab8bbfe2
1 changed files with 16 additions and 3 deletions
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19
arch/arm64/mm/init.c
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@ -274,7 +274,16 @@ static void __init update_memory_limit(void)
phys_addr_t min_ddr_sz = 0, offline_sz = 0;
int t_len = (2 * dt_root_size_cells) * sizeof(__be32);
ram_sz = memblock_phys_mem_size();
if (memory_limit == PHYS_ADDR_MAX)
ram_sz = memblock_phys_mem_size();
else if (IS_ALIGNED(memory_limit, MIN_MEMORY_BLOCK_SIZE))
ram_sz = memory_limit;
else {
WARN(1, "mem-offline is not supported for DDR size %lld\n",
memory_limit);
return;
}
node = of_get_flat_dt_subnode_by_name(dt_root, "mem-offline");
if (node == -FDT_ERR_NOTFOUND) {
pr_err("mem-offine node not found in FDT\n");
@ -434,12 +443,16 @@ void __init arm64_memblock_init(void)
memblock_remove(0, memstart_addr);
}
update_memory_limit();
/*
* Save bootloader imposed memory limit before we overwirte
* memblock.
*/
bootloader_memory_limit = memblock_end_of_DRAM();
if (memory_limit == PHYS_ADDR_MAX)
bootloader_memory_limit = memblock_end_of_DRAM();
else
bootloader_memory_limit = memblock_max_addr(memory_limit);
update_memory_limit();
/*
* Apply the memory limit if it was set. Since the kernel may be loaded