This is a note to let you know that I've just added the patch titled
MIPS: Loongson64: Reserve vgabios memory on boot
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mips-loongson64-reserve-vgabios-memory-on-boot.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8f7aa77a463f47c9e00592d02747a9fcf2271543 Mon Sep 17 00:00:00 2001
From: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
Date: Tue, 7 Nov 2023 11:15:18 +0000
Subject: MIPS: Loongson64: Reserve vgabios memory on boot
From: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
commit 8f7aa77a463f47c9e00592d02747a9fcf2271543 upstream.
vgabios is passed from firmware to kernel on Loongson64 systems.
Sane firmware will keep this pointer in reserved memory space
passed from the firmware but insane firmware keeps it in low
memory before kernel entry that is not reserved.
Previously kernel won't try to allocate memory from low memory
before kernel entry on boot, but after converting to memblock
it will do that.
Fix by resversing those memory on early boot.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: a94e4f24ec83 ("MIPS: init: Drop boot_mem_map")
Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
Signed-off-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/loongson64/init.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/arch/mips/loongson64/init.c
+++ b/arch/mips/loongson64/init.c
@@ -86,6 +86,11 @@ void __init szmem(unsigned int node)
break;
}
}
+
+ /* Reserve vgabios if it comes from firmware */
+ if (loongson_sysconf.vgabios_addr)
+ memblock_reserve(virt_to_phys((void *)loongson_sysconf.vgabios_addr),
+ SZ_256K);
}
#ifndef CONFIG_NUMA
Patches currently in stable-queue which might be from jiaxun.yang@xxxxxxxxxxx are
queue-5.15/mips-loongson64-enable-dma-noncoherent-support.patch
queue-5.15/mips-loongson64-reserve-vgabios-memory-on-boot.patch
