drivers/firmware/efi/libstub/efi-stub-entry.c | 29 +++++++++++++++++++ drivers/firmware/efi/libstub/efi-stub.c | 27 ----------------- 2 files changed, 29 insertions(+), 27 deletions(-)
Commit 42c8ea3dca094ab8 ("efi: libstub: Factor out EFI stub entrypoint
into separate file") moves setup_graphics() into efi_stub_common() which
is after handle_kernel_image(). This causes efifb no longer work because
handle_kernel_image() may move the core kernel to its preferred address,
which means the screen_info filled by the efistub will not be the same
as the one accessed by the core kernel. So let us call setup_graphics()
before handle_kernel_image() which restores the old behavior.
The side effect is zboot will not call setup_graphics(), but I think
zboot doesn't need it either.
Fixes: 42c8ea3dca094ab8 ("efi: libstub: Factor out EFI stub entrypoint into separate file")
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
V2: Use static declaration for setup_graphics() to avoid build warnings.
drivers/firmware/efi/libstub/efi-stub-entry.c | 29 +++++++++++++++++++
drivers/firmware/efi/libstub/efi-stub.c | 27 -----------------
2 files changed, 29 insertions(+), 27 deletions(-)
diff --git a/drivers/firmware/efi/libstub/efi-stub-entry.c b/drivers/firmware/efi/libstub/efi-stub-entry.c
index 5245c4f031c0..f971fd25a4eb 100644
--- a/drivers/firmware/efi/libstub/efi-stub-entry.c
+++ b/drivers/firmware/efi/libstub/efi-stub-entry.c
@@ -5,6 +5,30 @@
#include "efistub.h"
+static struct screen_info *setup_graphics(void)
+{
+ unsigned long size;
+ efi_status_t status;
+ efi_guid_t gop_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
+ void **gop_handle = NULL;
+ struct screen_info *si = NULL;
+
+ size = 0;
+ status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
+ &gop_proto, NULL, &size, gop_handle);
+ if (status == EFI_BUFFER_TOO_SMALL) {
+ si = alloc_screen_info();
+ if (!si)
+ return NULL;
+ status = efi_setup_gop(si, &gop_proto, size);
+ if (status != EFI_SUCCESS) {
+ free_screen_info(si);
+ return NULL;
+ }
+ }
+ return si;
+}
+
/*
* EFI entry point for the generic EFI stub used by ARM, arm64, RISC-V and
* LoongArch. This is the entrypoint that is described in the PE/COFF header
@@ -22,6 +46,7 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID;
unsigned long reserve_addr = 0;
unsigned long reserve_size = 0;
+ struct screen_info *si;
WRITE_ONCE(efi_system_table, systab);
@@ -47,6 +72,8 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
efi_info("Booting Linux Kernel...\n");
+ si = setup_graphics();
+
status = handle_kernel_image(&image_addr, &image_size,
&reserve_addr,
&reserve_size,
@@ -58,6 +85,8 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
status = efi_stub_common(handle, image, image_addr, cmdline_ptr);
+ free_screen_info(si);
+
efi_free(image_size, image_addr);
efi_free(reserve_size, reserve_addr);
diff --git a/drivers/firmware/efi/libstub/efi-stub.c b/drivers/firmware/efi/libstub/efi-stub.c
index 2955c1ac6a36..bc67af721412 100644
--- a/drivers/firmware/efi/libstub/efi-stub.c
+++ b/drivers/firmware/efi/libstub/efi-stub.c
@@ -56,30 +56,6 @@ void __weak free_screen_info(struct screen_info *si)
{
}
-static struct screen_info *setup_graphics(void)
-{
- efi_guid_t gop_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
- efi_status_t status;
- unsigned long size;
- void **gop_handle = NULL;
- struct screen_info *si = NULL;
-
- size = 0;
- status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
- &gop_proto, NULL, &size, gop_handle);
- if (status == EFI_BUFFER_TOO_SMALL) {
- si = alloc_screen_info();
- if (!si)
- return NULL;
- status = efi_setup_gop(si, &gop_proto, size);
- if (status != EFI_SUCCESS) {
- free_screen_info(si);
- return NULL;
- }
- }
- return si;
-}
-
static void install_memreserve_table(void)
{
struct linux_efi_memreserve *rsv;
@@ -163,14 +139,12 @@ efi_status_t efi_stub_common(efi_handle_t handle,
unsigned long image_addr,
char *cmdline_ptr)
{
- struct screen_info *si;
efi_status_t status;
status = check_platform_features();
if (status != EFI_SUCCESS)
return status;
- si = setup_graphics();
efi_retrieve_tpm2_eventlog();
@@ -190,7 +164,6 @@ efi_status_t efi_stub_common(efi_handle_t handle,
status = efi_boot_kernel(handle, image, image_addr, cmdline_ptr);
- free_screen_info(si);
return status;
}
--
2.39.1On Fri, 10 Mar 2023 at 03:18, Huacai Chen <chenhuacai@loongson.cn> wrote:
>
> Commit 42c8ea3dca094ab8 ("efi: libstub: Factor out EFI stub entrypoint
> into separate file") moves setup_graphics() into efi_stub_common() which
> is after handle_kernel_image(). This causes efifb no longer work because
> handle_kernel_image() may move the core kernel to its preferred address,
> which means the screen_info filled by the efistub will not be the same
> as the one accessed by the core kernel. So let us call setup_graphics()
> before handle_kernel_image() which restores the old behavior.
>
> The side effect is zboot will not call setup_graphics(), but I think
> zboot doesn't need it either.
>
> Fixes: 42c8ea3dca094ab8 ("efi: libstub: Factor out EFI stub entrypoint into separate file")
> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Please drop this patch from the loonarch tree - it is causing a
conflict in linux-next.
> ---
> V2: Use static declaration for setup_graphics() to avoid build warnings.
>
> drivers/firmware/efi/libstub/efi-stub-entry.c | 29 +++++++++++++++++++
> drivers/firmware/efi/libstub/efi-stub.c | 27 -----------------
> 2 files changed, 29 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/firmware/efi/libstub/efi-stub-entry.c b/drivers/firmware/efi/libstub/efi-stub-entry.c
> index 5245c4f031c0..f971fd25a4eb 100644
> --- a/drivers/firmware/efi/libstub/efi-stub-entry.c
> +++ b/drivers/firmware/efi/libstub/efi-stub-entry.c
> @@ -5,6 +5,30 @@
>
> #include "efistub.h"
>
> +static struct screen_info *setup_graphics(void)
> +{
> + unsigned long size;
> + efi_status_t status;
> + efi_guid_t gop_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
> + void **gop_handle = NULL;
> + struct screen_info *si = NULL;
> +
> + size = 0;
> + status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
> + &gop_proto, NULL, &size, gop_handle);
> + if (status == EFI_BUFFER_TOO_SMALL) {
> + si = alloc_screen_info();
> + if (!si)
> + return NULL;
> + status = efi_setup_gop(si, &gop_proto, size);
> + if (status != EFI_SUCCESS) {
> + free_screen_info(si);
> + return NULL;
> + }
> + }
> + return si;
> +}
> +
> /*
> * EFI entry point for the generic EFI stub used by ARM, arm64, RISC-V and
> * LoongArch. This is the entrypoint that is described in the PE/COFF header
> @@ -22,6 +46,7 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
> efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID;
> unsigned long reserve_addr = 0;
> unsigned long reserve_size = 0;
> + struct screen_info *si;
>
> WRITE_ONCE(efi_system_table, systab);
>
> @@ -47,6 +72,8 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
>
> efi_info("Booting Linux Kernel...\n");
>
> + si = setup_graphics();
> +
> status = handle_kernel_image(&image_addr, &image_size,
> &reserve_addr,
> &reserve_size,
> @@ -58,6 +85,8 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
>
> status = efi_stub_common(handle, image, image_addr, cmdline_ptr);
>
> + free_screen_info(si);
> +
> efi_free(image_size, image_addr);
> efi_free(reserve_size, reserve_addr);
>
> diff --git a/drivers/firmware/efi/libstub/efi-stub.c b/drivers/firmware/efi/libstub/efi-stub.c
> index 2955c1ac6a36..bc67af721412 100644
> --- a/drivers/firmware/efi/libstub/efi-stub.c
> +++ b/drivers/firmware/efi/libstub/efi-stub.c
> @@ -56,30 +56,6 @@ void __weak free_screen_info(struct screen_info *si)
> {
> }
>
> -static struct screen_info *setup_graphics(void)
> -{
> - efi_guid_t gop_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
> - efi_status_t status;
> - unsigned long size;
> - void **gop_handle = NULL;
> - struct screen_info *si = NULL;
> -
> - size = 0;
> - status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
> - &gop_proto, NULL, &size, gop_handle);
> - if (status == EFI_BUFFER_TOO_SMALL) {
> - si = alloc_screen_info();
> - if (!si)
> - return NULL;
> - status = efi_setup_gop(si, &gop_proto, size);
> - if (status != EFI_SUCCESS) {
> - free_screen_info(si);
> - return NULL;
> - }
> - }
> - return si;
> -}
> -
> static void install_memreserve_table(void)
> {
> struct linux_efi_memreserve *rsv;
> @@ -163,14 +139,12 @@ efi_status_t efi_stub_common(efi_handle_t handle,
> unsigned long image_addr,
> char *cmdline_ptr)
> {
> - struct screen_info *si;
> efi_status_t status;
>
> status = check_platform_features();
> if (status != EFI_SUCCESS)
> return status;
>
> - si = setup_graphics();
>
> efi_retrieve_tpm2_eventlog();
>
> @@ -190,7 +164,6 @@ efi_status_t efi_stub_common(efi_handle_t handle,
>
> status = efi_boot_kernel(handle, image, image_addr, cmdline_ptr);
>
> - free_screen_info(si);
> return status;
> }
>
> --
> 2.39.1
>
On Wed, Mar 15, 2023 at 6:31 AM Ard Biesheuvel <ardb@kernel.org> wrote:
>
> On Fri, 10 Mar 2023 at 03:18, Huacai Chen <chenhuacai@loongson.cn> wrote:
> >
> > Commit 42c8ea3dca094ab8 ("efi: libstub: Factor out EFI stub entrypoint
> > into separate file") moves setup_graphics() into efi_stub_common() which
> > is after handle_kernel_image(). This causes efifb no longer work because
> > handle_kernel_image() may move the core kernel to its preferred address,
> > which means the screen_info filled by the efistub will not be the same
> > as the one accessed by the core kernel. So let us call setup_graphics()
> > before handle_kernel_image() which restores the old behavior.
> >
> > The side effect is zboot will not call setup_graphics(), but I think
> > zboot doesn't need it either.
> >
> > Fixes: 42c8ea3dca094ab8 ("efi: libstub: Factor out EFI stub entrypoint into separate file")
> > Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
>
> Please drop this patch from the loonarch tree - it is causing a
> conflict in linux-next.
OK, will do.
Huacai
>
>
> > ---
> > V2: Use static declaration for setup_graphics() to avoid build warnings.
> >
> > drivers/firmware/efi/libstub/efi-stub-entry.c | 29 +++++++++++++++++++
> > drivers/firmware/efi/libstub/efi-stub.c | 27 -----------------
> > 2 files changed, 29 insertions(+), 27 deletions(-)
> >
> > diff --git a/drivers/firmware/efi/libstub/efi-stub-entry.c b/drivers/firmware/efi/libstub/efi-stub-entry.c
> > index 5245c4f031c0..f971fd25a4eb 100644
> > --- a/drivers/firmware/efi/libstub/efi-stub-entry.c
> > +++ b/drivers/firmware/efi/libstub/efi-stub-entry.c
> > @@ -5,6 +5,30 @@
> >
> > #include "efistub.h"
> >
> > +static struct screen_info *setup_graphics(void)
> > +{
> > + unsigned long size;
> > + efi_status_t status;
> > + efi_guid_t gop_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
> > + void **gop_handle = NULL;
> > + struct screen_info *si = NULL;
> > +
> > + size = 0;
> > + status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
> > + &gop_proto, NULL, &size, gop_handle);
> > + if (status == EFI_BUFFER_TOO_SMALL) {
> > + si = alloc_screen_info();
> > + if (!si)
> > + return NULL;
> > + status = efi_setup_gop(si, &gop_proto, size);
> > + if (status != EFI_SUCCESS) {
> > + free_screen_info(si);
> > + return NULL;
> > + }
> > + }
> > + return si;
> > +}
> > +
> > /*
> > * EFI entry point for the generic EFI stub used by ARM, arm64, RISC-V and
> > * LoongArch. This is the entrypoint that is described in the PE/COFF header
> > @@ -22,6 +46,7 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
> > efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID;
> > unsigned long reserve_addr = 0;
> > unsigned long reserve_size = 0;
> > + struct screen_info *si;
> >
> > WRITE_ONCE(efi_system_table, systab);
> >
> > @@ -47,6 +72,8 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
> >
> > efi_info("Booting Linux Kernel...\n");
> >
> > + si = setup_graphics();
> > +
> > status = handle_kernel_image(&image_addr, &image_size,
> > &reserve_addr,
> > &reserve_size,
> > @@ -58,6 +85,8 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
> >
> > status = efi_stub_common(handle, image, image_addr, cmdline_ptr);
> >
> > + free_screen_info(si);
> > +
> > efi_free(image_size, image_addr);
> > efi_free(reserve_size, reserve_addr);
> >
> > diff --git a/drivers/firmware/efi/libstub/efi-stub.c b/drivers/firmware/efi/libstub/efi-stub.c
> > index 2955c1ac6a36..bc67af721412 100644
> > --- a/drivers/firmware/efi/libstub/efi-stub.c
> > +++ b/drivers/firmware/efi/libstub/efi-stub.c
> > @@ -56,30 +56,6 @@ void __weak free_screen_info(struct screen_info *si)
> > {
> > }
> >
> > -static struct screen_info *setup_graphics(void)
> > -{
> > - efi_guid_t gop_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
> > - efi_status_t status;
> > - unsigned long size;
> > - void **gop_handle = NULL;
> > - struct screen_info *si = NULL;
> > -
> > - size = 0;
> > - status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
> > - &gop_proto, NULL, &size, gop_handle);
> > - if (status == EFI_BUFFER_TOO_SMALL) {
> > - si = alloc_screen_info();
> > - if (!si)
> > - return NULL;
> > - status = efi_setup_gop(si, &gop_proto, size);
> > - if (status != EFI_SUCCESS) {
> > - free_screen_info(si);
> > - return NULL;
> > - }
> > - }
> > - return si;
> > -}
> > -
> > static void install_memreserve_table(void)
> > {
> > struct linux_efi_memreserve *rsv;
> > @@ -163,14 +139,12 @@ efi_status_t efi_stub_common(efi_handle_t handle,
> > unsigned long image_addr,
> > char *cmdline_ptr)
> > {
> > - struct screen_info *si;
> > efi_status_t status;
> >
> > status = check_platform_features();
> > if (status != EFI_SUCCESS)
> > return status;
> >
> > - si = setup_graphics();
> >
> > efi_retrieve_tpm2_eventlog();
> >
> > @@ -190,7 +164,6 @@ efi_status_t efi_stub_common(efi_handle_t handle,
> >
> > status = efi_boot_kernel(handle, image, image_addr, cmdline_ptr);
> >
> > - free_screen_info(si);
> > return status;
> > }
> >
> > --
> > 2.39.1
> >
© 2016 - 2025 Red Hat, Inc.