From: Ard Biesheuvel <ardb@kernel.org>
Date: Sun, 12 Mar 2023 23:00:03 +0100
Subject: [PATCH] efi: earlycon: Reprobe after parsing config tables
References: bsc#1012628
Patch-mainline: 6.2.9
Git-commit: 8b3a149db461d3286d1e211112de3b44ccaeaf71
[ Upstream commit 8b3a149db461d3286d1e211112de3b44ccaeaf71 ]
Commit 732ea9db9d8a ("efi: libstub: Move screen_info handling to common
code") reorganized the earlycon handling so that all architectures pass
the screen_info data via a EFI config table instead of populating struct
screen_info directly, as the latter is only possible when the EFI stub
is baked into the kernel (and not into the decompressor).
However, this means that struct screen_info may not have been populated
yet by the time the earlycon probe takes place, and this results in a
non-functional early console.
So let's probe again right after parsing the config tables and
populating struct screen_info. Note that this means that earlycon output
starts a bit later than before, and so it may fail to capture issues
that occur while doing the early EFI initialization.
Fixes: 732ea9db9d8a ("efi: libstub: Move screen_info handling to common code")
Reported-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/firmware/efi/earlycon.c | 16 +++++++++++++---
drivers/firmware/efi/efi-init.c | 3 +++
include/linux/efi.h | 1 +
3 files changed, 17 insertions(+), 3 deletions(-)
diff --git a/drivers/firmware/efi/earlycon.c b/drivers/firmware/efi/earlycon.c
index 4d6c5327..1bc63286 100644
--- a/drivers/firmware/efi/earlycon.c
+++ b/drivers/firmware/efi/earlycon.c
@@ -204,6 +204,14 @@ efi_earlycon_write(struct console *con, const char *str, unsigned int num)
}
}
+static bool __initdata fb_probed;
+
+void __init efi_earlycon_reprobe(void)
+{
+ if (fb_probed)
+ setup_earlycon("efifb");
+}
+
static int __init efi_earlycon_setup(struct earlycon_device *device,
const char *opt)
{
@@ -211,15 +219,17 @@ static int __init efi_earlycon_setup(struct earlycon_device *device,
u16 xres, yres;
u32 i;
- if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
+ fb_wb = opt && !strcmp(opt, "ram");
+
+ if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI) {
+ fb_probed = true;
return -ENODEV;
+ }
fb_base = screen_info.lfb_base;
if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
fb_base |= (u64)screen_info.ext_lfb_base << 32;
- fb_wb = opt && !strcmp(opt, "ram");
-
si = &screen_info;
xres = si->lfb_width;
yres = si->lfb_height;
diff --git a/drivers/firmware/efi/efi-init.c b/drivers/firmware/efi/efi-init.c
index 16391594..5cb7fb45 100644
--- a/drivers/firmware/efi/efi-init.c
+++ b/drivers/firmware/efi/efi-init.c
@@ -72,6 +72,9 @@ static void __init init_screen_info(void)
if (memblock_is_map_memory(screen_info.lfb_base))
memblock_mark_nomap(screen_info.lfb_base,
screen_info.lfb_size);
+
+ if (IS_ENABLED(CONFIG_EFI_EARLYCON))
+ efi_earlycon_reprobe();
}
}
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 98598bd1..ac22f7ca 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -688,6 +688,7 @@ efi_guid_to_str(efi_guid_t *guid, char *out)
}
extern void efi_init (void);
+extern void efi_earlycon_reprobe(void);
#ifdef CONFIG_EFI
extern void efi_enter_virtual_mode (void); /* switch EFI to virtual mode, if possible */
#else
--
2.35.3