From 1a48b0be93d48f9ec5498297ec775fb572d3d150 Mon Sep 17 00:00:00 2001 From: Sughosh Ganu Date: Mon, 2 Dec 2024 12:36:24 +0530 Subject: [PATCH] lmb: prohibit allocations above ram_top even from same bank 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 Tested-by: Andreas Schwab --- lib/lmb.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/lib/lmb.c b/lib/lmb.c index 3a765c11be..b03237bc06 100644 --- a/lib/lmb.c +++ b/lib/lmb.c @@ -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); } } } -- 2.39.5