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lmb: prohibit allocations above ram_top even from same bank

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There are platforms which set the value of ram_top based on certain
restrictions that the platform might have in accessing memory above
ram_top, even when the memory region is in the same DRAM bank. So,
even though the LMB allocator works as expected, when trying to
allocate memory above ram_top, prohibit this by marking all memory
above ram_top as reserved, even if the said memory region is from the
same bank.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Tested-by: Andreas Schwab <schwab@suse.de>
This commit is contained in:
Sughosh Ganu 2024-12-02 12:36:24 +05:30 • committed by Tom Rini
parent ef9574da96
commit 1a48b0be93
1 changed files with 6 additions and 0 deletions
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6
lib/lmb.c
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@ -606,6 +606,7 @@ static __maybe_unused void lmb_reserve_common_spl(void)
void lmb_add_memory(void)
{
int i;
phys_addr_t bank_end;
phys_size_t size;
u64 ram_top = gd->ram_top;
struct bd_info *bd = gd->bd;
@ -619,6 +620,8 @@ void lmb_add_memory(void)
for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
size = bd->bi_dram[i].size;
bank_end = bd->bi_dram[i].start + size;
if (size) {
lmb_add(bd->bi_dram[i].start, size);
@ -630,6 +633,9 @@ void lmb_add_memory(void)
if (bd->bi_dram[i].start >= ram_top)
lmb_reserve_flags(bd->bi_dram[i].start, size,
LMB_NOOVERWRITE);
else if (bank_end > ram_top)
lmb_reserve_flags(ram_top, bank_end - ram_top,
LMB_NOOVERWRITE);
}
}
}