[PATCH v2 0/9] video: screen_info cleanups

[PATCH v2 0/9] video: screen_info cleanups

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

I refreshed the first four patches that I sent before with very minor
updates, and then added some more to further disaggregate the use
of screen_info:

 - I found that powerpc wasn't using vga16fb any more

 - vgacon can be almost entirely separated from the global
   screen_info, except on x86

 - similarly, the EFI framebuffer initialization can be
   kept separate, except on x86.

I did extensive build testing on arm/arm64/x86 and the normal built bot
testing for the other architectures.

Which tree should this get merged through?

Link: https://lore.kernel.org/lkml/20230707095415.1449376-1-arnd@kernel.org/

Arnd Bergmann (9):
  vgacon: rework Kconfig dependencies
  vgacon: rework screen_info #ifdef checks
  dummycon: limit Arm console size hack to footbridge
  vgacon, arch/*: remove unused screen_info definitions
  vgacon: remove screen_info dependency
  vgacon: clean up global screen_info instances
  vga16fb: drop powerpc support
  hyperv: avoid dependency on screen_info
  efi: move screen_info into efi init code

 arch/alpha/kernel/proto.h                     |  2 +
 arch/alpha/kernel/setup.c                     |  8 +--
 arch/alpha/kernel/sys_sio.c                   |  8 ++-
 arch/arm/include/asm/setup.h                  |  5 ++
 arch/arm/kernel/atags_parse.c                 | 20 +++---
 arch/arm/kernel/efi.c                         |  6 --
 arch/arm/kernel/setup.c                       |  7 +-
 arch/arm64/kernel/efi.c                       |  4 --
 arch/arm64/kernel/image-vars.h                |  2 +
 arch/csky/kernel/setup.c                      | 12 ----
 arch/hexagon/kernel/Makefile                  |  2 -
 arch/hexagon/kernel/screen_info.c             |  3 -
 arch/ia64/kernel/setup.c                      | 51 +++++++-------
 arch/loongarch/kernel/efi.c                   |  3 +-
 arch/loongarch/kernel/image-vars.h            |  2 +
 arch/loongarch/kernel/setup.c                 |  3 -
 arch/mips/jazz/setup.c                        |  9 ---
 arch/mips/kernel/setup.c                      | 11 ---
 arch/mips/mti-malta/malta-setup.c             |  4 +-
 arch/mips/sibyte/swarm/setup.c                | 26 ++++---
 arch/mips/sni/setup.c                         | 18 ++---
 arch/nios2/kernel/setup.c                     |  5 --
 arch/powerpc/kernel/setup-common.c            | 16 -----
 arch/riscv/kernel/setup.c                     | 12 ----
 arch/sh/kernel/setup.c                        |  5 --
 arch/sparc/kernel/setup_32.c                  | 13 ----
 arch/sparc/kernel/setup_64.c                  | 13 ----
 arch/x86/kernel/setup.c                       |  2 +-
 arch/xtensa/kernel/setup.c                    | 12 ----
 drivers/firmware/efi/efi-init.c               | 14 +++-
 drivers/firmware/efi/libstub/efi-stub-entry.c |  8 ++-
 drivers/firmware/pcdp.c                       |  1 -
 drivers/gpu/drm/hyperv/hyperv_drm_drv.c       |  7 +-
 drivers/hv/vmbus_drv.c                        |  6 +-
 drivers/video/console/Kconfig                 | 11 +--
 drivers/video/console/dummycon.c              |  2 +-
 drivers/video/console/vgacon.c                | 68 +++++++++++--------
 drivers/video/fbdev/Kconfig                   |  2 +-
 drivers/video/fbdev/hyperv_fb.c               |  8 +--
 drivers/video/fbdev/vga16fb.c                 |  9 +--
 include/linux/console.h                       |  7 ++
 41 files changed, 178 insertions(+), 249 deletions(-)
 delete mode 100644 arch/hexagon/kernel/screen_info.c

-- 
2.39.2

Cc: "David S. Miller" <davem@davemloft.net>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Cain <bcain@quicinc.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Airlie <airlied@gmail.com>
Cc: Deepak Rawat <drawat.floss@gmail.com>
Cc: Dexuan Cui <decui@microsoft.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Guo Ren <guoren@kernel.org>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Javier Martinez Canillas <javierm@redhat.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Khalid Aziz <khalid@gonehiking.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: WANG Xuerui <kernel@xen0n.name>
Cc: Wei Liu <wei.liu@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: x86@kernel.org
Cc: linux-alpha@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-efi@vger.kernel.org
Cc: linux-csky@vger.kernel.org
Cc: linux-hexagon@vger.kernel.org
Cc: linux-ia64@vger.kernel.org
Cc: loongarch@lists.linux.dev
Cc: linux-mips@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-riscv@lists.infradead.org
Cc: linux-sh@vger.kernel.org
Cc: sparclinux@vger.kernel.org
Cc: linux-hyperv@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-fbdev@vger.kernel.org

[PATCH v2 1/9] vgacon: rework Kconfig dependencies

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

The list of dependencies here is phrased as an opt-out, but this is missing
a lot of architectures that don't actually support VGA consoles, and some
of the entries are stale:

 - powerpc used to support VGA consoles in the old arch/ppc codebase, but
   the merged arch/powerpc never did

 - arm lists footbridge, integrator and netwinder, but netwinder is actually
   part of footbridge, and integrator does not appear to have an actual
   VGA hardware, or list it in its ATAG or DT.

 - mips has a few platforms (malta, sibyte, and sni) that initialize
   screen_info, on everything else the console is selected but cannot
   actually work.

 - csky, hexgagon, loongarch, nios2, riscv and xtensa are not listed
   in the opt-out table and declare a screen_info to allow building
   vga_con, but this cannot work because the console is never selected.

Replace this with an opt-in table that lists only the platforms that
remain. This is effectively x86, plus a couple of historic workstation
and server machines that reused parts of the x86 system architecture.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/video/console/Kconfig | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/video/console/Kconfig b/drivers/video/console/Kconfig
index 1b5a319971ed0..6af90db6d2da9 100644
--- a/drivers/video/console/Kconfig
+++ b/drivers/video/console/Kconfig
@@ -7,9 +7,9 @@ menu "Console display driver support"
 
 config VGA_CONSOLE
 	bool "VGA text console" if EXPERT || !X86
-	depends on !4xx && !PPC_8xx && !SPARC && !M68K && !PARISC &&  !SUPERH && \
-		(!ARM || ARCH_FOOTBRIDGE || ARCH_INTEGRATOR || ARCH_NETWINDER) && \
-		!ARM64 && !ARC && !MICROBLAZE && !OPENRISC && !S390 && !UML
+	depends on ALPHA || IA64 || X86 || \
+		(ARM && ARCH_FOOTBRIDGE) || \
+		(MIPS && (MIPS_MALTA || SIBYTE_BCM112X || SIBYTE_SB1250 || SIBYTE_BCM1x80 || SNI_RM))
 	select APERTURE_HELPERS if (DRM || FB || VFIO_PCI_CORE)
 	default y
 	help
-- 
2.39.2

Re: [PATCH v2 1/9] vgacon: rework Kconfig dependencies

[Khalid Aziz]

On 7/19/23 6:39 AM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> The list of dependencies here is phrased as an opt-out, but this is missing
> a lot of architectures that don't actually support VGA consoles, and some
> of the entries are stale:
> 
>   - powerpc used to support VGA consoles in the old arch/ppc codebase, but
>     the merged arch/powerpc never did
> 
>   - arm lists footbridge, integrator and netwinder, but netwinder is actually
>     part of footbridge, and integrator does not appear to have an actual
>     VGA hardware, or list it in its ATAG or DT.
> 
>   - mips has a few platforms (malta, sibyte, and sni) that initialize
>     screen_info, on everything else the console is selected but cannot
>     actually work.
> 
>   - csky, hexgagon, loongarch, nios2, riscv and xtensa are not listed
>     in the opt-out table and declare a screen_info to allow building
>     vga_con, but this cannot work because the console is never selected.
> 
> Replace this with an opt-in table that lists only the platforms that
> remain. This is effectively x86, plus a couple of historic workstation
> and server machines that reused parts of the x86 system architecture.
> 
> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
> Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>


Reviewed-by: Khalid Aziz <khalid@gonehiking.org>


> ---
>   drivers/video/console/Kconfig | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/video/console/Kconfig b/drivers/video/console/Kconfig
> index 1b5a319971ed0..6af90db6d2da9 100644
> --- a/drivers/video/console/Kconfig
> +++ b/drivers/video/console/Kconfig
> @@ -7,9 +7,9 @@ menu "Console display driver support"
>   
>   config VGA_CONSOLE
>   	bool "VGA text console" if EXPERT || !X86
> -	depends on !4xx && !PPC_8xx && !SPARC && !M68K && !PARISC &&  !SUPERH && \
> -		(!ARM || ARCH_FOOTBRIDGE || ARCH_INTEGRATOR || ARCH_NETWINDER) && \
> -		!ARM64 && !ARC && !MICROBLAZE && !OPENRISC && !S390 && !UML
> +	depends on ALPHA || IA64 || X86 || \
> +		(ARM && ARCH_FOOTBRIDGE) || \
> +		(MIPS && (MIPS_MALTA || SIBYTE_BCM112X || SIBYTE_SB1250 || SIBYTE_BCM1x80 || SNI_RM))
>   	select APERTURE_HELPERS if (DRM || FB || VFIO_PCI_CORE)
>   	default y
>   	help

Re: [PATCH v2 1/9] vgacon: rework Kconfig dependencies

[Michael Ellerman]

Arnd Bergmann <arnd@kernel.org> writes:
> From: Arnd Bergmann <arnd@arndb.de>
>
> The list of dependencies here is phrased as an opt-out, but this is missing
> a lot of architectures that don't actually support VGA consoles, and some
> of the entries are stale:
>
>  - powerpc used to support VGA consoles in the old arch/ppc codebase, but
>    the merged arch/powerpc never did

Not disputing this, but how did you come to that conclusion? I grepped
around and couldn't convince myself whether it can work on powerpc or
not. ie. currently it's possible to enable CONFIG_VGA_CONSOLE and
powerpc does have a struct screen_info defined which seems like it would
allow vgacon_startup() to complete.

My only concern is that someone could be using it with Qemu?

cheers

Re: [PATCH v2 1/9] vgacon: rework Kconfig dependencies

[Arnd Bergmann]

On Fri, Jul 21, 2023, at 06:59, Michael Ellerman wrote:
> Arnd Bergmann <arnd@kernel.org> writes:
>> From: Arnd Bergmann <arnd@arndb.de>
>>
>> The list of dependencies here is phrased as an opt-out, but this is missing
>> a lot of architectures that don't actually support VGA consoles, and some
>> of the entries are stale:
>>
>>  - powerpc used to support VGA consoles in the old arch/ppc codebase, but
>>    the merged arch/powerpc never did
>
> Not disputing this, but how did you come to that conclusion? I grepped
> around and couldn't convince myself whether it can work on powerpc or
> not. ie. currently it's possible to enable CONFIG_VGA_CONSOLE and
> powerpc does have a struct screen_info defined which seems like it would
> allow vgacon_startup() to complete.

The VGA console needs both screen_info and vga_con to work. In arch/ppc
we had both, but in arch/powerpc we only retained the screen_info:

$ git grep vga_con v2.6.26 -- arch/ppc arch/ppc64 arch/powerpc
v2.6.26:arch/ppc/platforms/pplus.c:     conswitchp = &vga_con;
v2.6.26:arch/ppc/platforms/prep_setup.c:        conswitchp = &vga_con;

so after arch/ppc was removed, this became impossible to use on both
pplus and prep. These two platforms were also (as far as I can tell)
the only ones to support vga16fb as an alternative to vgacon, but
both platforms were removed later on.

> My only concern is that someone could be using it with Qemu?

I have not yet ruled out anyone using vga16fb on qemu before
commit 0db5b61e0dc07 ("fbdev/vga16fb: Create EGA/VGA devices
in sysfb code"), but I can see that this has been broken for
12 months without anyone complaining about it, since vga16fb
no longer works with the "orig_video_isVGA == 1" setting
in arch/powerpc (the device is not created).

In the qemu sources, I see five powerpc machines that intialize
VGA support: mac_newworld, mac_oldworld, pegasos2, prep, and spapr.
I think we can exclude prep (which was removed from the kernel)
and spapr (64-bit VGA_MAP_MEM() looks broken). I think the
macs always come up in graphical mode and only use
offb/atifb/rivafb/matroxfb but not vga16fb that would require
running the x86 VGA BIOS initialization.

I suppose it's possible to use vga16fb (not vgacon) with
"qemu-system-ppc -M pegasos2 -vga std" if that still boots
at all. Support for pegasos2 hardware appears to have been
removed with commit 04debf21fa174 ("powerpc: Remove core
support for Marvell mv64x60 hostbridges"), but it's possible
that this did not break qemu support if that only uses
devices under arch/powerpc/platforms/chrp/pci.c. I could
not get it to boot, but did not try very hard.

      Arnd

Re: [PATCH v2 1/9] vgacon: rework Kconfig dependencies

[Geert Uytterhoeven]

Hi Arnd,

On Fri, Jul 21, 2023 at 10:29 AM Arnd Bergmann <arnd@arndb.de> wrote:
> On Fri, Jul 21, 2023, at 06:59, Michael Ellerman wrote:
> > Arnd Bergmann <arnd@kernel.org> writes:
> >> From: Arnd Bergmann <arnd@arndb.de>
> >>
> >> The list of dependencies here is phrased as an opt-out, but this is missing
> >> a lot of architectures that don't actually support VGA consoles, and some
> >> of the entries are stale:
> >>
> >>  - powerpc used to support VGA consoles in the old arch/ppc codebase, but
> >>    the merged arch/powerpc never did
> >
> > Not disputing this, but how did you come to that conclusion? I grepped
> > around and couldn't convince myself whether it can work on powerpc or
> > not. ie. currently it's possible to enable CONFIG_VGA_CONSOLE and
> > powerpc does have a struct screen_info defined which seems like it would
> > allow vgacon_startup() to complete.
>
> The VGA console needs both screen_info and vga_con to work. In arch/ppc
> we had both, but in arch/powerpc we only retained the screen_info:
>
> $ git grep vga_con v2.6.26 -- arch/ppc arch/ppc64 arch/powerpc
> v2.6.26:arch/ppc/platforms/pplus.c:     conswitchp = &vga_con;
> v2.6.26:arch/ppc/platforms/prep_setup.c:        conswitchp = &vga_con;
>
> so after arch/ppc was removed, this became impossible to use on both
> pplus and prep. These two platforms were also (as far as I can tell)
> the only ones to support vga16fb as an alternative to vgacon, but
> both platforms were removed later on.

I did use vgacon and vga16fb on CHRP on a second video card
(initialized using Gabriel Paubert's x86 BIOS emulator), but that was
definitely before the advent of arch/powerpc/.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

[PATCH v2 2/9] vgacon: rework screen_info #ifdef checks

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

On non-x86 architectures, the screen_info variable is generally only
used for the VGA console where supported, and in some cases the EFI
framebuffer or vga16fb.

Now that we have a definite list of which architectures actually use it
for what, use consistent #ifdef checks so the global variable is only
defined when it is actually used on those architectures.

Loongarch and riscv have no support for vgacon or vga16fb, but
they support EFI firmware, so only that needs to be checked, and the
initialization can be removed because that is handled by EFI.
IA64 has both vgacon and EFI, though EFI apparently never uses
a framebuffer here.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
v2 changes:
 - split out mips/jazz change
 - improve ia64 #ifdef changes
---
 arch/alpha/kernel/setup.c      |  2 ++
 arch/alpha/kernel/sys_sio.c    |  2 ++
 arch/ia64/kernel/setup.c       |  6 ++++++
 arch/loongarch/kernel/setup.c  |  2 ++
 arch/mips/kernel/setup.c       |  2 +-
 arch/mips/sibyte/swarm/setup.c |  2 +-
 arch/mips/sni/setup.c          |  2 +-
 arch/riscv/kernel/setup.c      | 11 ++---------
 8 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/arch/alpha/kernel/setup.c b/arch/alpha/kernel/setup.c
index b650ff1cb022e..b4d2297765c02 100644
--- a/arch/alpha/kernel/setup.c
+++ b/arch/alpha/kernel/setup.c
@@ -131,6 +131,7 @@ static void determine_cpu_caches (unsigned int);
 
 static char __initdata command_line[COMMAND_LINE_SIZE];
 
+#ifdef CONFIG_VGA_CONSOLE
 /*
  * The format of "screen_info" is strange, and due to early
  * i386-setup code. This is just enough to make the console
@@ -147,6 +148,7 @@ struct screen_info screen_info = {
 };
 
 EXPORT_SYMBOL(screen_info);
+#endif
 
 /*
  * The direct map I/O window, if any.  This should be the same
diff --git a/arch/alpha/kernel/sys_sio.c b/arch/alpha/kernel/sys_sio.c
index 7c420d8dac53d..7de8a5d2d2066 100644
--- a/arch/alpha/kernel/sys_sio.c
+++ b/arch/alpha/kernel/sys_sio.c
@@ -57,11 +57,13 @@ sio_init_irq(void)
 static inline void __init
 alphabook1_init_arch(void)
 {
+#ifdef CONFIG_VGA_CONSOLE
 	/* The AlphaBook1 has LCD video fixed at 800x600,
 	   37 rows and 100 cols. */
 	screen_info.orig_y = 37;
 	screen_info.orig_video_cols = 100;
 	screen_info.orig_video_lines = 37;
+#endif
 
 	lca_init_arch();
 }
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index 5a55ac82c13a4..d2c66efdde560 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -86,9 +86,13 @@ EXPORT_SYMBOL(local_per_cpu_offset);
 #endif
 unsigned long ia64_cycles_per_usec;
 struct ia64_boot_param *ia64_boot_param;
+#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_EFI)
 struct screen_info screen_info;
+#endif
+#ifdef CONFIG_VGA_CONSOLE
 unsigned long vga_console_iobase;
 unsigned long vga_console_membase;
+#endif
 
 static struct resource data_resource = {
 	.name	= "Kernel data",
@@ -497,6 +501,7 @@ early_console_setup (char *cmdline)
 static void __init
 screen_info_setup(void)
 {
+#ifdef CONFIG_VGA_CONSOLE
 	unsigned int orig_x, orig_y, num_cols, num_rows, font_height;
 
 	memset(&screen_info, 0, sizeof(screen_info));
@@ -525,6 +530,7 @@ screen_info_setup(void)
 	screen_info.orig_video_mode = 3;	/* XXX fake */
 	screen_info.orig_video_isVGA = 1;	/* XXX fake */
 	screen_info.orig_video_ega_bx = 3;	/* XXX fake */
+#endif
 }
 
 static inline void
diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c
index 95e6b579dfdd1..77e7a3722caa6 100644
--- a/arch/loongarch/kernel/setup.c
+++ b/arch/loongarch/kernel/setup.c
@@ -57,7 +57,9 @@
 #define SMBIOS_CORE_PACKAGE_OFFSET	0x23
 #define LOONGSON_EFI_ENABLE		(1 << 3)
 
+#ifdef CONFIG_EFI
 struct screen_info screen_info __section(".data");
+#endif
 
 unsigned long fw_arg0, fw_arg1, fw_arg2;
 DEFINE_PER_CPU(unsigned long, kernelsp);
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index cb871eb784a7c..1aba7dc95132c 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -54,7 +54,7 @@ struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
 
 EXPORT_SYMBOL(cpu_data);
 
-#ifdef CONFIG_VT
+#ifdef CONFIG_VGA_CONSOLE
 struct screen_info screen_info;
 #endif
 
diff --git a/arch/mips/sibyte/swarm/setup.c b/arch/mips/sibyte/swarm/setup.c
index 76683993cdd3a..37df504d3ecbb 100644
--- a/arch/mips/sibyte/swarm/setup.c
+++ b/arch/mips/sibyte/swarm/setup.c
@@ -129,7 +129,7 @@ void __init plat_mem_setup(void)
 	if (m41t81_probe())
 		swarm_rtc_type = RTC_M41T81;
 
-#ifdef CONFIG_VT
+#ifdef CONFIG_VGA_CONSOLE
 	screen_info = (struct screen_info) {
 		.orig_video_page	= 52,
 		.orig_video_mode	= 3,
diff --git a/arch/mips/sni/setup.c b/arch/mips/sni/setup.c
index efad85c8c823b..9984cf91be7d0 100644
--- a/arch/mips/sni/setup.c
+++ b/arch/mips/sni/setup.c
@@ -38,7 +38,7 @@ extern void sni_machine_power_off(void);
 
 static void __init sni_display_setup(void)
 {
-#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE) && defined(CONFIG_FW_ARC)
+#if defined(CONFIG_VGA_CONSOLE) && defined(CONFIG_FW_ARC)
 	struct screen_info *si = &screen_info;
 	DISPLAY_STATUS *di;
 
diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index 971fe776e2f8b..a3dbe13f45fb3 100644
--- a/arch/riscv/kernel/setup.c
+++ b/arch/riscv/kernel/setup.c
@@ -39,15 +39,8 @@
 
 #include "head.h"
 
-#if defined(CONFIG_DUMMY_CONSOLE) || defined(CONFIG_EFI)
-struct screen_info screen_info __section(".data") = {
-	.orig_video_lines	= 30,
-	.orig_video_cols	= 80,
-	.orig_video_mode	= 0,
-	.orig_video_ega_bx	= 0,
-	.orig_video_isVGA	= 1,
-	.orig_video_points	= 8
-};
+#if defined(CONFIG_EFI)
+struct screen_info screen_info __section(".data");
 #endif
 
 /*
-- 
2.39.2

Re: [PATCH v2 2/9] vgacon: rework screen_info #ifdef checks

[Khalid Aziz]

On 7/19/23 6:39 AM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> On non-x86 architectures, the screen_info variable is generally only
> used for the VGA console where supported, and in some cases the EFI
> framebuffer or vga16fb.
> 
> Now that we have a definite list of which architectures actually use it
> for what, use consistent #ifdef checks so the global variable is only
> defined when it is actually used on those architectures.
> 
> Loongarch and riscv have no support for vgacon or vga16fb, but
> they support EFI firmware, so only that needs to be checked, and the
> initialization can be removed because that is handled by EFI.
> IA64 has both vgacon and EFI, though EFI apparently never uses
> a framebuffer here.
> 
> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
> Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>


Reviewed-by: Khalid Aziz <khalid@gonehiking.org>

> ---
> v2 changes:
>   - split out mips/jazz change
>   - improve ia64 #ifdef changes
> ---
>   arch/alpha/kernel/setup.c      |  2 ++
>   arch/alpha/kernel/sys_sio.c    |  2 ++
>   arch/ia64/kernel/setup.c       |  6 ++++++
>   arch/loongarch/kernel/setup.c  |  2 ++
>   arch/mips/kernel/setup.c       |  2 +-
>   arch/mips/sibyte/swarm/setup.c |  2 +-
>   arch/mips/sni/setup.c          |  2 +-
>   arch/riscv/kernel/setup.c      | 11 ++---------
>   8 files changed, 17 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/alpha/kernel/setup.c b/arch/alpha/kernel/setup.c
> index b650ff1cb022e..b4d2297765c02 100644
> --- a/arch/alpha/kernel/setup.c
> +++ b/arch/alpha/kernel/setup.c
> @@ -131,6 +131,7 @@ static void determine_cpu_caches (unsigned int);
>   
>   static char __initdata command_line[COMMAND_LINE_SIZE];
>   
> +#ifdef CONFIG_VGA_CONSOLE
>   /*
>    * The format of "screen_info" is strange, and due to early
>    * i386-setup code. This is just enough to make the console
> @@ -147,6 +148,7 @@ struct screen_info screen_info = {
>   };
>   
>   EXPORT_SYMBOL(screen_info);
> +#endif
>   
>   /*
>    * The direct map I/O window, if any.  This should be the same
> diff --git a/arch/alpha/kernel/sys_sio.c b/arch/alpha/kernel/sys_sio.c
> index 7c420d8dac53d..7de8a5d2d2066 100644
> --- a/arch/alpha/kernel/sys_sio.c
> +++ b/arch/alpha/kernel/sys_sio.c
> @@ -57,11 +57,13 @@ sio_init_irq(void)
>   static inline void __init
>   alphabook1_init_arch(void)
>   {
> +#ifdef CONFIG_VGA_CONSOLE
>   	/* The AlphaBook1 has LCD video fixed at 800x600,
>   	   37 rows and 100 cols. */
>   	screen_info.orig_y = 37;
>   	screen_info.orig_video_cols = 100;
>   	screen_info.orig_video_lines = 37;
> +#endif
>   
>   	lca_init_arch();
>   }
> diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
> index 5a55ac82c13a4..d2c66efdde560 100644
> --- a/arch/ia64/kernel/setup.c
> +++ b/arch/ia64/kernel/setup.c
> @@ -86,9 +86,13 @@ EXPORT_SYMBOL(local_per_cpu_offset);
>   #endif
>   unsigned long ia64_cycles_per_usec;
>   struct ia64_boot_param *ia64_boot_param;
> +#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_EFI)
>   struct screen_info screen_info;
> +#endif
> +#ifdef CONFIG_VGA_CONSOLE
>   unsigned long vga_console_iobase;
>   unsigned long vga_console_membase;
> +#endif
>   
>   static struct resource data_resource = {
>   	.name	= "Kernel data",
> @@ -497,6 +501,7 @@ early_console_setup (char *cmdline)
>   static void __init
>   screen_info_setup(void)
>   {
> +#ifdef CONFIG_VGA_CONSOLE
>   	unsigned int orig_x, orig_y, num_cols, num_rows, font_height;
>   
>   	memset(&screen_info, 0, sizeof(screen_info));
> @@ -525,6 +530,7 @@ screen_info_setup(void)
>   	screen_info.orig_video_mode = 3;	/* XXX fake */
>   	screen_info.orig_video_isVGA = 1;	/* XXX fake */
>   	screen_info.orig_video_ega_bx = 3;	/* XXX fake */
> +#endif
>   }
>   
>   static inline void
> diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c
> index 95e6b579dfdd1..77e7a3722caa6 100644
> --- a/arch/loongarch/kernel/setup.c
> +++ b/arch/loongarch/kernel/setup.c
> @@ -57,7 +57,9 @@
>   #define SMBIOS_CORE_PACKAGE_OFFSET	0x23
>   #define LOONGSON_EFI_ENABLE		(1 << 3)
>   
> +#ifdef CONFIG_EFI
>   struct screen_info screen_info __section(".data");
> +#endif
>   
>   unsigned long fw_arg0, fw_arg1, fw_arg2;
>   DEFINE_PER_CPU(unsigned long, kernelsp);
> diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
> index cb871eb784a7c..1aba7dc95132c 100644
> --- a/arch/mips/kernel/setup.c
> +++ b/arch/mips/kernel/setup.c
> @@ -54,7 +54,7 @@ struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
>   
>   EXPORT_SYMBOL(cpu_data);
>   
> -#ifdef CONFIG_VT
> +#ifdef CONFIG_VGA_CONSOLE
>   struct screen_info screen_info;
>   #endif
>   
> diff --git a/arch/mips/sibyte/swarm/setup.c b/arch/mips/sibyte/swarm/setup.c
> index 76683993cdd3a..37df504d3ecbb 100644
> --- a/arch/mips/sibyte/swarm/setup.c
> +++ b/arch/mips/sibyte/swarm/setup.c
> @@ -129,7 +129,7 @@ void __init plat_mem_setup(void)
>   	if (m41t81_probe())
>   		swarm_rtc_type = RTC_M41T81;
>   
> -#ifdef CONFIG_VT
> +#ifdef CONFIG_VGA_CONSOLE
>   	screen_info = (struct screen_info) {
>   		.orig_video_page	= 52,
>   		.orig_video_mode	= 3,
> diff --git a/arch/mips/sni/setup.c b/arch/mips/sni/setup.c
> index efad85c8c823b..9984cf91be7d0 100644
> --- a/arch/mips/sni/setup.c
> +++ b/arch/mips/sni/setup.c
> @@ -38,7 +38,7 @@ extern void sni_machine_power_off(void);
>   
>   static void __init sni_display_setup(void)
>   {
> -#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE) && defined(CONFIG_FW_ARC)
> +#if defined(CONFIG_VGA_CONSOLE) && defined(CONFIG_FW_ARC)
>   	struct screen_info *si = &screen_info;
>   	DISPLAY_STATUS *di;
>   
> diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> index 971fe776e2f8b..a3dbe13f45fb3 100644
> --- a/arch/riscv/kernel/setup.c
> +++ b/arch/riscv/kernel/setup.c
> @@ -39,15 +39,8 @@
>   
>   #include "head.h"
>   
> -#if defined(CONFIG_DUMMY_CONSOLE) || defined(CONFIG_EFI)
> -struct screen_info screen_info __section(".data") = {
> -	.orig_video_lines	= 30,
> -	.orig_video_cols	= 80,
> -	.orig_video_mode	= 0,
> -	.orig_video_ega_bx	= 0,
> -	.orig_video_isVGA	= 1,
> -	.orig_video_points	= 8
> -};
> +#if defined(CONFIG_EFI)
> +struct screen_info screen_info __section(".data");
>   #endif
>   
>   /*

[PATCH v2 3/9] dummycon: limit Arm console size hack to footbridge

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

The dummycon default console size used to be determined by architecture,
but now this is a Kconfig setting on everything except ARM. Tracing this
back in the historic git trees, this was used to match the size of VGA
console or VGA framebuffer on early machines, but nowadays that code is
no longer used, except probably on the old footbridge/netwinder since
that is the only one that supports vgacon.

On machines with a framebuffer, booting with DT so far results in always
using the hardcoded 80x30 size in dummycon, while on ATAGS the setting
can come from a bootloader specific override. Both seem to be worse
choices than the Kconfig setting, since the actual text size for fbcon
also depends on the selected font.

Make this work the same way as everywhere else and use the normal
Kconfig setting, except for the footbridge with vgacon, which keeps
using the traditional code. If vgacon is disabled, footbridge can
also ignore the setting. This means the screen_info only has to be
provided when either vgacon or EFI are enabled now.

To limit the amount of surprises on Arm, change the Kconfig default
to the previously used 80x30 setting instead of the usual 80x25.

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/arm/kernel/atags_parse.c    | 2 +-
 arch/arm/kernel/setup.c          | 3 +--
 drivers/video/console/Kconfig    | 5 +++--
 drivers/video/console/dummycon.c | 2 +-
 4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/arm/kernel/atags_parse.c b/arch/arm/kernel/atags_parse.c
index 33f6eb5213a5a..4c815da3b77b0 100644
--- a/arch/arm/kernel/atags_parse.c
+++ b/arch/arm/kernel/atags_parse.c
@@ -69,7 +69,7 @@ static int __init parse_tag_mem32(const struct tag *tag)
 
 __tagtable(ATAG_MEM, parse_tag_mem32);
 
-#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
+#if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_VGA_CONSOLE)
 static int __init parse_tag_videotext(const struct tag *tag)
 {
 	screen_info.orig_x            = tag->u.videotext.x;
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index c66b560562b30..40326a35a179b 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -928,8 +928,7 @@ static void __init request_standard_resources(const struct machine_desc *mdesc)
 		request_resource(&ioport_resource, &lp2);
 }
 
-#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE) || \
-    defined(CONFIG_EFI)
+#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_EFI)
 struct screen_info screen_info = {
  .orig_video_lines	= 30,
  .orig_video_cols	= 80,
diff --git a/drivers/video/console/Kconfig b/drivers/video/console/Kconfig
index 6af90db6d2da9..b575cf54174af 100644
--- a/drivers/video/console/Kconfig
+++ b/drivers/video/console/Kconfig
@@ -52,7 +52,7 @@ config DUMMY_CONSOLE
 
 config DUMMY_CONSOLE_COLUMNS
 	int "Initial number of console screen columns"
-	depends on DUMMY_CONSOLE && !ARM
+	depends on DUMMY_CONSOLE && !ARCH_FOOTBRIDGE
 	default 160 if PARISC
 	default 80
 	help
@@ -62,8 +62,9 @@ config DUMMY_CONSOLE_COLUMNS
 
 config DUMMY_CONSOLE_ROWS
 	int "Initial number of console screen rows"
-	depends on DUMMY_CONSOLE && !ARM
+	depends on DUMMY_CONSOLE && !ARCH_FOOTBRIDGE
 	default 64 if PARISC
+	default 30 if ARM
 	default 25
 	help
 	  On PA-RISC, the default value is 64, which should fit a 1280x1024
diff --git a/drivers/video/console/dummycon.c b/drivers/video/console/dummycon.c
index f1711b2f9ff05..70549fecee12c 100644
--- a/drivers/video/console/dummycon.c
+++ b/drivers/video/console/dummycon.c
@@ -18,7 +18,7 @@
  *  Dummy console driver
  */
 
-#if defined(__arm__)
+#if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_VGA_CONSOLE)
 #define DUMMY_COLUMNS	screen_info.orig_video_cols
 #define DUMMY_ROWS	screen_info.orig_video_lines
 #else
-- 
2.39.2

[PATCH v2 4/9] vgacon, arch/*: remove unused screen_info definitions

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

A number of architectures either kept the screen_info definition for
historical purposes as it used to be required by the generic VT code, or
they copied it from another architecture in order to build the VGA console
driver in an allmodconfig build. The mips definition is used by some
platforms, but the initialization on jazz is not needed.

Now that vgacon no longer builds on these architectures, remove the
stale definitions and initializations.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Dinh Nguyen <dinguyen@kernel.org>
Acked-by: Max Filippov <jcmvbkbc@gmail.com>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Acked-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/csky/kernel/setup.c          | 12 ------------
 arch/hexagon/kernel/Makefile      |  2 --
 arch/hexagon/kernel/screen_info.c |  3 ---
 arch/mips/jazz/setup.c            |  9 ---------
 arch/nios2/kernel/setup.c         |  5 -----
 arch/sh/kernel/setup.c            |  5 -----
 arch/sparc/kernel/setup_32.c      | 13 -------------
 arch/sparc/kernel/setup_64.c      | 13 -------------
 arch/xtensa/kernel/setup.c        | 12 ------------
 9 files changed, 74 deletions(-)
 delete mode 100644 arch/hexagon/kernel/screen_info.c

diff --git a/arch/csky/kernel/setup.c b/arch/csky/kernel/setup.c
index 106fbf0b6f3b4..51012e90780d6 100644
--- a/arch/csky/kernel/setup.c
+++ b/arch/csky/kernel/setup.c
@@ -8,22 +8,10 @@
 #include <linux/of_fdt.h>
 #include <linux/start_kernel.h>
 #include <linux/dma-map-ops.h>
-#include <linux/screen_info.h>
 #include <asm/sections.h>
 #include <asm/mmu_context.h>
 #include <asm/pgalloc.h>
 
-#ifdef CONFIG_DUMMY_CONSOLE
-struct screen_info screen_info = {
-	.orig_video_lines	= 30,
-	.orig_video_cols	= 80,
-	.orig_video_mode	= 0,
-	.orig_video_ega_bx	= 0,
-	.orig_video_isVGA	= 1,
-	.orig_video_points	= 8
-};
-#endif
-
 static void __init csky_memblock_init(void)
 {
 	unsigned long lowmem_size = PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET);
diff --git a/arch/hexagon/kernel/Makefile b/arch/hexagon/kernel/Makefile
index e73cb321630ec..3fdf937eb572e 100644
--- a/arch/hexagon/kernel/Makefile
+++ b/arch/hexagon/kernel/Makefile
@@ -17,5 +17,3 @@ obj-y += vm_vectors.o
 obj-$(CONFIG_HAS_DMA) += dma.o
 
 obj-$(CONFIG_STACKTRACE) += stacktrace.o
-
-obj-$(CONFIG_VGA_CONSOLE) += screen_info.o
diff --git a/arch/hexagon/kernel/screen_info.c b/arch/hexagon/kernel/screen_info.c
deleted file mode 100644
index 1e1ceb18bafe7..0000000000000
--- a/arch/hexagon/kernel/screen_info.c
+++ /dev/null
@@ -1,3 +0,0 @@
-#include <linux/screen_info.h>
-
-struct screen_info screen_info;
diff --git a/arch/mips/jazz/setup.c b/arch/mips/jazz/setup.c
index ee044261eb223..23059ead773fc 100644
--- a/arch/mips/jazz/setup.c
+++ b/arch/mips/jazz/setup.c
@@ -13,7 +13,6 @@
 #include <linux/init.h>
 #include <linux/ioport.h>
 #include <linux/console.h>
-#include <linux/screen_info.h>
 #include <linux/platform_device.h>
 #include <linux/serial_8250.h>
 #include <linux/dma-mapping.h>
@@ -76,14 +75,6 @@ void __init plat_mem_setup(void)
 
 	_machine_restart = jazz_machine_restart;
 
-#ifdef CONFIG_VT
-	screen_info = (struct screen_info) {
-		.orig_video_cols	= 160,
-		.orig_video_lines	= 64,
-		.orig_video_points	= 16,
-	};
-#endif
-
 	add_preferred_console("ttyS", 0, "9600");
 }
 
diff --git a/arch/nios2/kernel/setup.c b/arch/nios2/kernel/setup.c
index 8582ed9658447..da122a5fa43b2 100644
--- a/arch/nios2/kernel/setup.c
+++ b/arch/nios2/kernel/setup.c
@@ -19,7 +19,6 @@
 #include <linux/memblock.h>
 #include <linux/initrd.h>
 #include <linux/of_fdt.h>
-#include <linux/screen_info.h>
 
 #include <asm/mmu_context.h>
 #include <asm/sections.h>
@@ -36,10 +35,6 @@ static struct pt_regs fake_regs = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 					0, 0, 0, 0, 0, 0,
 					0};
 
-#ifdef CONFIG_VT
-struct screen_info screen_info;
-#endif
-
 /* Copy a short hook instruction sequence to the exception address */
 static inline void copy_exception_handler(unsigned int addr)
 {
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index b3da2757faaf3..3d80515298d26 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -7,7 +7,6 @@
  *  Copyright (C) 1999  Niibe Yutaka
  *  Copyright (C) 2002 - 2010 Paul Mundt
  */
-#include <linux/screen_info.h>
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/initrd.h>
@@ -69,10 +68,6 @@ EXPORT_SYMBOL(cpu_data);
 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
 EXPORT_SYMBOL(sh_mv);
 
-#ifdef CONFIG_VT
-struct screen_info screen_info;
-#endif
-
 extern int root_mountflags;
 
 #define RAMDISK_IMAGE_START_MASK	0x07FF
diff --git a/arch/sparc/kernel/setup_32.c b/arch/sparc/kernel/setup_32.c
index 34ef7febf0d56..e3b72a7b46d37 100644
--- a/arch/sparc/kernel/setup_32.c
+++ b/arch/sparc/kernel/setup_32.c
@@ -17,7 +17,6 @@
 #include <linux/initrd.h>
 #include <asm/smp.h>
 #include <linux/user.h>
-#include <linux/screen_info.h>
 #include <linux/delay.h>
 #include <linux/fs.h>
 #include <linux/seq_file.h>
@@ -51,18 +50,6 @@
 
 #include "kernel.h"
 
-struct screen_info screen_info = {
-	0, 0,			/* orig-x, orig-y */
-	0,			/* unused */
-	0,			/* orig-video-page */
-	0,			/* orig-video-mode */
-	128,			/* orig-video-cols */
-	0,0,0,			/* ega_ax, ega_bx, ega_cx */
-	54,			/* orig-video-lines */
-	0,                      /* orig-video-isVGA */
-	16                      /* orig-video-points */
-};
-
 /* Typing sync at the prom prompt calls the function pointed to by
  * romvec->pv_synchook which I set to the following function.
  * This should sync all filesystems and return, for now it just
diff --git a/arch/sparc/kernel/setup_64.c b/arch/sparc/kernel/setup_64.c
index 6546ca9d4d3f1..6a4797dec34b4 100644
--- a/arch/sparc/kernel/setup_64.c
+++ b/arch/sparc/kernel/setup_64.c
@@ -15,7 +15,6 @@
 #include <linux/ptrace.h>
 #include <asm/smp.h>
 #include <linux/user.h>
-#include <linux/screen_info.h>
 #include <linux/delay.h>
 #include <linux/fs.h>
 #include <linux/seq_file.h>
@@ -68,18 +67,6 @@
 DEFINE_SPINLOCK(ns87303_lock);
 EXPORT_SYMBOL(ns87303_lock);
 
-struct screen_info screen_info = {
-	0, 0,			/* orig-x, orig-y */
-	0,			/* unused */
-	0,			/* orig-video-page */
-	0,			/* orig-video-mode */
-	128,			/* orig-video-cols */
-	0, 0, 0,		/* unused, ega_bx, unused */
-	54,			/* orig-video-lines */
-	0,                      /* orig-video-isVGA */
-	16                      /* orig-video-points */
-};
-
 static void
 prom_console_write(struct console *con, const char *s, unsigned int n)
 {
diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
index aba3ff4e60d85..3f22d0537818d 100644
--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -19,7 +19,6 @@
 #include <linux/init.h>
 #include <linux/mm.h>
 #include <linux/proc_fs.h>
-#include <linux/screen_info.h>
 #include <linux/kernel.h>
 #include <linux/percpu.h>
 #include <linux/reboot.h>
@@ -49,17 +48,6 @@
 #include <asm/timex.h>
 #include <asm/traps.h>
 
-#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
-struct screen_info screen_info = {
-	.orig_x = 0,
-	.orig_y = 24,
-	.orig_video_cols = 80,
-	.orig_video_lines = 24,
-	.orig_video_isVGA = 1,
-	.orig_video_points = 16,
-};
-#endif
-
 #ifdef CONFIG_BLK_DEV_INITRD
 extern unsigned long initrd_start;
 extern unsigned long initrd_end;
-- 
2.39.2

Re: [PATCH v2 4/9] vgacon, arch/*: remove unused screen_info definitions

[Philippe Mathieu-Daudé]

On 19/7/23 14:39, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> A number of architectures either kept the screen_info definition for
> historical purposes as it used to be required by the generic VT code, or
> they copied it from another architecture in order to build the VGA console
> driver in an allmodconfig build. The mips definition is used by some
> platforms, but the initialization on jazz is not needed.
> 
> Now that vgacon no longer builds on these architectures, remove the
> stale definitions and initializations.
> 
> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
> Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
> Acked-by: Dinh Nguyen <dinguyen@kernel.org>
> Acked-by: Max Filippov <jcmvbkbc@gmail.com>
> Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
> Acked-by: Guo Ren <guoren@kernel.org>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>   arch/csky/kernel/setup.c          | 12 ------------
>   arch/hexagon/kernel/Makefile      |  2 --
>   arch/hexagon/kernel/screen_info.c |  3 ---
>   arch/mips/jazz/setup.c            |  9 ---------
>   arch/nios2/kernel/setup.c         |  5 -----
>   arch/sh/kernel/setup.c            |  5 -----
>   arch/sparc/kernel/setup_32.c      | 13 -------------
>   arch/sparc/kernel/setup_64.c      | 13 -------------
>   arch/xtensa/kernel/setup.c        | 12 ------------
>   9 files changed, 74 deletions(-)
>   delete mode 100644 arch/hexagon/kernel/screen_info.c

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>

[PATCH v2 5/9] vgacon: remove screen_info dependency

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

The vga console driver is fairly self-contained, and only used by
architectures that explicitly initialize the screen_info settings.

Chance every instance that picks the vga console by setting conswitchp
to call a function instead, and pass a reference to the screen_info
there.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/alpha/kernel/setup.c      |  2 +-
 arch/arm/kernel/setup.c        |  2 +-
 arch/ia64/kernel/setup.c       |  2 +-
 arch/mips/kernel/setup.c       |  2 +-
 arch/x86/kernel/setup.c        |  2 +-
 drivers/firmware/pcdp.c        |  2 +-
 drivers/video/console/vgacon.c | 68 ++++++++++++++++++++--------------
 include/linux/console.h        |  7 ++++
 8 files changed, 53 insertions(+), 34 deletions(-)

diff --git a/arch/alpha/kernel/setup.c b/arch/alpha/kernel/setup.c
index b4d2297765c02..d73b685fe9852 100644
--- a/arch/alpha/kernel/setup.c
+++ b/arch/alpha/kernel/setup.c
@@ -655,7 +655,7 @@ setup_arch(char **cmdline_p)
 
 #ifdef CONFIG_VT
 #if defined(CONFIG_VGA_CONSOLE)
-	conswitchp = &vga_con;
+	vgacon_register_screen(&screen_info);
 #endif
 #endif
 
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 40326a35a179b..5d8a7fb3eba45 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -1192,7 +1192,7 @@ void __init setup_arch(char **cmdline_p)
 
 #ifdef CONFIG_VT
 #if defined(CONFIG_VGA_CONSOLE)
-	conswitchp = &vga_con;
+	vgacon_register_screen(&screen_info);
 #endif
 #endif
 
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index d2c66efdde560..2c9283fcd3759 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -619,7 +619,7 @@ setup_arch (char **cmdline_p)
 		 * memory so we can avoid this problem.
 		 */
 		if (efi_mem_type(0xA0000) != EFI_CONVENTIONAL_MEMORY)
-			conswitchp = &vga_con;
+			vgacon_register_screen(&screen_info);
 # endif
 	}
 #endif
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 1aba7dc95132c..6c3fae62a9f6b 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -794,7 +794,7 @@ void __init setup_arch(char **cmdline_p)
 
 #if defined(CONFIG_VT)
 #if defined(CONFIG_VGA_CONSOLE)
-	conswitchp = &vga_con;
+	vgacon_register_screen(&screen_info);
 #endif
 #endif
 
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index fd975a4a52006..b1ea77d504615 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1293,7 +1293,7 @@ void __init setup_arch(char **cmdline_p)
 #ifdef CONFIG_VT
 #if defined(CONFIG_VGA_CONSOLE)
 	if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
-		conswitchp = &vga_con;
+		vgacon_register_screen(&screen_info);
 #endif
 #endif
 	x86_init.oem.banner();
diff --git a/drivers/firmware/pcdp.c b/drivers/firmware/pcdp.c
index 715a45442d1cf..667a595373b2d 100644
--- a/drivers/firmware/pcdp.c
+++ b/drivers/firmware/pcdp.c
@@ -72,7 +72,7 @@ setup_vga_console(struct pcdp_device *dev)
 		return -ENODEV;
 	}
 
-	conswitchp = &vga_con;
+	vgacon_register_screen(&screen_info);
 	printk(KERN_INFO "PCDP: VGA console\n");
 	return 0;
 #else
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
index e25ba523892e5..3d7fedf27ffc1 100644
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -97,6 +97,8 @@ static int 		vga_video_font_height;
 static int 		vga_scan_lines		__read_mostly;
 static unsigned int 	vga_rolled_over; /* last vc_origin offset before wrap */
 
+static struct screen_info *vga_si;
+
 static bool vga_hardscroll_enabled;
 static bool vga_hardscroll_user_enable = true;
 
@@ -161,8 +163,9 @@ static const char *vgacon_startup(void)
 	u16 saved1, saved2;
 	volatile u16 *p;
 
-	if (screen_info.orig_video_isVGA == VIDEO_TYPE_VLFB ||
-	    screen_info.orig_video_isVGA == VIDEO_TYPE_EFI) {
+	if (!vga_si ||
+	    vga_si->orig_video_isVGA == VIDEO_TYPE_VLFB ||
+	    vga_si->orig_video_isVGA == VIDEO_TYPE_EFI) {
 	      no_vga:
 #ifdef CONFIG_DUMMY_CONSOLE
 		conswitchp = &dummy_con;
@@ -172,29 +175,29 @@ static const char *vgacon_startup(void)
 #endif
 	}
 
-	/* boot_params.screen_info reasonably initialized? */
-	if ((screen_info.orig_video_lines == 0) ||
-	    (screen_info.orig_video_cols  == 0))
+	/* vga_si reasonably initialized? */
+	if ((vga_si->orig_video_lines == 0) ||
+	    (vga_si->orig_video_cols  == 0))
 		goto no_vga;
 
 	/* VGA16 modes are not handled by VGACON */
-	if ((screen_info.orig_video_mode == 0x0D) ||	/* 320x200/4 */
-	    (screen_info.orig_video_mode == 0x0E) ||	/* 640x200/4 */
-	    (screen_info.orig_video_mode == 0x10) ||	/* 640x350/4 */
-	    (screen_info.orig_video_mode == 0x12) ||	/* 640x480/4 */
-	    (screen_info.orig_video_mode == 0x6A))	/* 800x600/4 (VESA) */
+	if ((vga_si->orig_video_mode == 0x0D) ||	/* 320x200/4 */
+	    (vga_si->orig_video_mode == 0x0E) ||	/* 640x200/4 */
+	    (vga_si->orig_video_mode == 0x10) ||	/* 640x350/4 */
+	    (vga_si->orig_video_mode == 0x12) ||	/* 640x480/4 */
+	    (vga_si->orig_video_mode == 0x6A))	/* 800x600/4 (VESA) */
 		goto no_vga;
 
-	vga_video_num_lines = screen_info.orig_video_lines;
-	vga_video_num_columns = screen_info.orig_video_cols;
+	vga_video_num_lines = vga_si->orig_video_lines;
+	vga_video_num_columns = vga_si->orig_video_cols;
 	vgastate.vgabase = NULL;
 
-	if (screen_info.orig_video_mode == 7) {
+	if (vga_si->orig_video_mode == 7) {
 		/* Monochrome display */
 		vga_vram_base = 0xb0000;
 		vga_video_port_reg = VGA_CRT_IM;
 		vga_video_port_val = VGA_CRT_DM;
-		if ((screen_info.orig_video_ega_bx & 0xff) != 0x10) {
+		if ((vga_si->orig_video_ega_bx & 0xff) != 0x10) {
 			static struct resource ega_console_resource =
 			    { .name	= "ega",
 			      .flags	= IORESOURCE_IO,
@@ -231,12 +234,12 @@ static const char *vgacon_startup(void)
 		vga_vram_base = 0xb8000;
 		vga_video_port_reg = VGA_CRT_IC;
 		vga_video_port_val = VGA_CRT_DC;
-		if ((screen_info.orig_video_ega_bx & 0xff) != 0x10) {
+		if ((vga_si->orig_video_ega_bx & 0xff) != 0x10) {
 			int i;
 
 			vga_vram_size = 0x8000;
 
-			if (!screen_info.orig_video_isVGA) {
+			if (!vga_si->orig_video_isVGA) {
 				static struct resource ega_console_resource =
 				    { .name	= "ega",
 				      .flags	= IORESOURCE_IO,
@@ -327,14 +330,14 @@ static const char *vgacon_startup(void)
 	    || vga_video_type == VIDEO_TYPE_VGAC
 	    || vga_video_type == VIDEO_TYPE_EGAM) {
 		vga_hardscroll_enabled = vga_hardscroll_user_enable;
-		vga_default_font_height = screen_info.orig_video_points;
-		vga_video_font_height = screen_info.orig_video_points;
+		vga_default_font_height = vga_si->orig_video_points;
+		vga_video_font_height = vga_si->orig_video_points;
 		/* This may be suboptimal but is a safe bet - go with it */
 		vga_scan_lines =
 		    vga_video_font_height * vga_video_num_lines;
 	}
 
-	vgacon_xres = screen_info.orig_video_cols * VGA_FONTWIDTH;
+	vgacon_xres = vga_si->orig_video_cols * VGA_FONTWIDTH;
 	vgacon_yres = vga_scan_lines;
 
 	return display_desc;
@@ -379,7 +382,7 @@ static void vgacon_init(struct vc_data *c, int init)
 	/* Only set the default if the user didn't deliberately override it */
 	if (global_cursor_default == -1)
 		global_cursor_default =
-			!(screen_info.flags & VIDEO_FLAGS_NOCURSOR);
+			!(vga_si->flags & VIDEO_FLAGS_NOCURSOR);
 }
 
 static void vgacon_deinit(struct vc_data *c)
@@ -607,7 +610,7 @@ static int vgacon_switch(struct vc_data *c)
 {
 	int x = c->vc_cols * VGA_FONTWIDTH;
 	int y = c->vc_rows * c->vc_cell_height;
-	int rows = screen_info.orig_video_lines * vga_default_font_height/
+	int rows = vga_si->orig_video_lines * vga_default_font_height/
 		c->vc_cell_height;
 	/*
 	 * We need to save screen size here as it's the only way
@@ -627,7 +630,7 @@ static int vgacon_switch(struct vc_data *c)
 
 		if ((vgacon_xres != x || vgacon_yres != y) &&
 		    (!(vga_video_num_columns % 2) &&
-		     vga_video_num_columns <= screen_info.orig_video_cols &&
+		     vga_video_num_columns <= vga_si->orig_video_cols &&
 		     vga_video_num_lines <= rows))
 			vgacon_doresize(c, c->vc_cols, c->vc_rows);
 	}
@@ -1074,13 +1077,13 @@ static int vgacon_resize(struct vc_data *c, unsigned int width,
 		 * Ho ho!  Someone (svgatextmode, eh?) may have reprogrammed
 		 * the video mode!  Set the new defaults then and go away.
 		 */
-		screen_info.orig_video_cols = width;
-		screen_info.orig_video_lines = height;
+		vga_si->orig_video_cols = width;
+		vga_si->orig_video_lines = height;
 		vga_default_font_height = c->vc_cell_height;
 		return 0;
 	}
-	if (width % 2 || width > screen_info.orig_video_cols ||
-	    height > (screen_info.orig_video_lines * vga_default_font_height)/
+	if (width % 2 || width > vga_si->orig_video_cols ||
+	    height > (vga_si->orig_video_lines * vga_default_font_height)/
 	    c->vc_cell_height)
 		return -EINVAL;
 
@@ -1110,8 +1113,8 @@ static void vgacon_save_screen(struct vc_data *c)
 		 * console initialization routines.
 		 */
 		vga_bootup_console = 1;
-		c->state.x = screen_info.orig_x;
-		c->state.y = screen_info.orig_y;
+		c->state.x = vga_si->orig_x;
+		c->state.y = vga_si->orig_y;
 	}
 
 	/* We can't copy in more than the size of the video buffer,
@@ -1204,4 +1207,13 @@ const struct consw vga_con = {
 };
 EXPORT_SYMBOL(vga_con);
 
+void vgacon_register_screen(struct screen_info *si)
+{
+	if (!si || vga_si)
+		return;
+
+	conswitchp = &vga_con;
+	vga_si = si;
+}
+
 MODULE_LICENSE("GPL");
diff --git a/include/linux/console.h b/include/linux/console.h
index d3195664baa5a..5f900210e689e 100644
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -101,6 +101,13 @@ extern const struct consw dummy_con;	/* dummy console buffer */
 extern const struct consw vga_con;	/* VGA text console */
 extern const struct consw newport_con;	/* SGI Newport console  */
 
+struct screen_info;
+#ifdef CONFIG_VGA_CONSOLE
+void vgacon_register_screen(struct screen_info *si);
+#else
+static inline void vgacon_register_screen(struct screen_info *si) { }
+#endif
+
 int con_is_bound(const struct consw *csw);
 int do_unregister_con_driver(const struct consw *csw);
 int do_take_over_console(const struct consw *sw, int first, int last, int deflt);
-- 
2.39.2

Re: [PATCH v2 5/9] vgacon: remove screen_info dependency

[Javier Martinez Canillas]

Arnd Bergmann <arnd@kernel.org> writes:

> From: Arnd Bergmann <arnd@arndb.de>
>
> The vga console driver is fairly self-contained, and only used by
> architectures that explicitly initialize the screen_info settings.
>
> Chance every instance that picks the vga console by setting conswitchp
> to call a function instead, and pass a reference to the screen_info
> there.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat

Re: [PATCH v2 5/9] vgacon: remove screen_info dependency

[Philippe Mathieu-Daudé]

Hi Arnd,

On 19/7/23 14:39, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> The vga console driver is fairly self-contained, and only used by
> architectures that explicitly initialize the screen_info settings.
> 
> Chance every instance that picks the vga console by setting conswitchp
> to call a function instead, and pass a reference to the screen_info
> there.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>   arch/alpha/kernel/setup.c      |  2 +-
>   arch/arm/kernel/setup.c        |  2 +-
>   arch/ia64/kernel/setup.c       |  2 +-
>   arch/mips/kernel/setup.c       |  2 +-
>   arch/x86/kernel/setup.c        |  2 +-
>   drivers/firmware/pcdp.c        |  2 +-
>   drivers/video/console/vgacon.c | 68 ++++++++++++++++++++--------------
>   include/linux/console.h        |  7 ++++
>   8 files changed, 53 insertions(+), 34 deletions(-)


> @@ -1074,13 +1077,13 @@ static int vgacon_resize(struct vc_data *c, unsigned int width,
>   		 * Ho ho!  Someone (svgatextmode, eh?) may have reprogrammed
>   		 * the video mode!  Set the new defaults then and go away.
>   		 */
> -		screen_info.orig_video_cols = width;
> -		screen_info.orig_video_lines = height;
> +		vga_si->orig_video_cols = width;
> +		vga_si->orig_video_lines = height;
>   		vga_default_font_height = c->vc_cell_height;
>   		return 0;
>   	}
> -	if (width % 2 || width > screen_info.orig_video_cols ||
> -	    height > (screen_info.orig_video_lines * vga_default_font_height)/
> +	if (width % 2 || width > vga_si->orig_video_cols ||
> +	    height > (vga_si->orig_video_lines * vga_default_font_height)/
>   	    c->vc_cell_height)
>   		return -EINVAL;
>   
> @@ -1110,8 +1113,8 @@ static void vgacon_save_screen(struct vc_data *c)
>   		 * console initialization routines.
>   		 */
>   		vga_bootup_console = 1;
> -		c->state.x = screen_info.orig_x;
> -		c->state.y = screen_info.orig_y;
> +		c->state.x = vga_si->orig_x;
> +		c->state.y = vga_si->orig_y;

Not really my area, so bare with me if this is obviously not
possible :) If using DUMMY_CONSOLE, can we trigger a save_screen
/ resize? If so, we'd reach here with vga_si=NULL.

>   	}
>   
>   	/* We can't copy in more than the size of the video buffer,
> @@ -1204,4 +1207,13 @@ const struct consw vga_con = {
>   };
>   EXPORT_SYMBOL(vga_con);
>   
> +void vgacon_register_screen(struct screen_info *si)
> +{
> +	if (!si || vga_si)
> +		return;
> +
> +	conswitchp = &vga_con;
> +	vga_si = si;
> +}

Re: [PATCH v2 5/9] vgacon: remove screen_info dependency

[Arnd Bergmann]

On Wed, Jul 19, 2023, at 15:49, Philippe Mathieu-Daudé wrote:
> On 19/7/23 14:39, Arnd Bergmann wrote:

>> @@ -1074,13 +1077,13 @@ static int vgacon_resize(struct vc_data *c, unsigned int width,
>>   		 * Ho ho!  Someone (svgatextmode, eh?) may have reprogrammed
>>   		 * the video mode!  Set the new defaults then and go away.
>>   		 */
>> -		screen_info.orig_video_cols = width;
>> -		screen_info.orig_video_lines = height;
>> +		vga_si->orig_video_cols = width;
>> +		vga_si->orig_video_lines = height;
>>   		vga_default_font_height = c->vc_cell_height;
>>   		return 0;
>>   	}
>> -	if (width % 2 || width > screen_info.orig_video_cols ||
>> -	    height > (screen_info.orig_video_lines * vga_default_font_height)/
>> +	if (width % 2 || width > vga_si->orig_video_cols ||
>> +	    height > (vga_si->orig_video_lines * vga_default_font_height)/
>>   	    c->vc_cell_height)
>>   		return -EINVAL;
>>   
>> @@ -1110,8 +1113,8 @@ static void vgacon_save_screen(struct vc_data *c)
>>   		 * console initialization routines.
>>   		 */
>>   		vga_bootup_console = 1;
>> -		c->state.x = screen_info.orig_x;
>> -		c->state.y = screen_info.orig_y;
>> +		c->state.x = vga_si->orig_x;
>> +		c->state.y = vga_si->orig_y;
>
> Not really my area, so bare with me if this is obviously not
> possible :) If using DUMMY_CONSOLE, can we trigger a save_screen
> / resize? If so, we'd reach here with vga_si=NULL.
>

I think it cannot happen because the only way that anything calls
into vgacon.c is through the "conswitchp = &vga_con;" that now happens
at the same time as the "vga_si = &screen_info;". It's definitely
possible that I'm missing something as well here.

     Arnd

Re: [PATCH v2 5/9] vgacon: remove screen_info dependency

[Khalid Aziz]

On 7/19/23 6:39 AM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> The vga console driver is fairly self-contained, and only used by
> architectures that explicitly initialize the screen_info settings.
> 
> Chance every instance that picks the vga console by setting conswitchp
> to call a function instead, and pass a reference to the screen_info
> there.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

PCDP and ia64 changes look good to me.

Acked-by: Khalid Azzi <khalid@gonehiking.org>

> ---
>   arch/alpha/kernel/setup.c      |  2 +-
>   arch/arm/kernel/setup.c        |  2 +-
>   arch/ia64/kernel/setup.c       |  2 +-
>   arch/mips/kernel/setup.c       |  2 +-
>   arch/x86/kernel/setup.c        |  2 +-
>   drivers/firmware/pcdp.c        |  2 +-
>   drivers/video/console/vgacon.c | 68 ++++++++++++++++++++--------------
>   include/linux/console.h        |  7 ++++
>   8 files changed, 53 insertions(+), 34 deletions(-)
> 
> diff --git a/arch/alpha/kernel/setup.c b/arch/alpha/kernel/setup.c
> index b4d2297765c02..d73b685fe9852 100644
> --- a/arch/alpha/kernel/setup.c
> +++ b/arch/alpha/kernel/setup.c
> @@ -655,7 +655,7 @@ setup_arch(char **cmdline_p)
>   
>   #ifdef CONFIG_VT
>   #if defined(CONFIG_VGA_CONSOLE)
> -	conswitchp = &vga_con;
> +	vgacon_register_screen(&screen_info);
>   #endif
>   #endif
>   
> diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
> index 40326a35a179b..5d8a7fb3eba45 100644
> --- a/arch/arm/kernel/setup.c
> +++ b/arch/arm/kernel/setup.c
> @@ -1192,7 +1192,7 @@ void __init setup_arch(char **cmdline_p)
>   
>   #ifdef CONFIG_VT
>   #if defined(CONFIG_VGA_CONSOLE)
> -	conswitchp = &vga_con;
> +	vgacon_register_screen(&screen_info);
>   #endif
>   #endif
>   
> diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
> index d2c66efdde560..2c9283fcd3759 100644
> --- a/arch/ia64/kernel/setup.c
> +++ b/arch/ia64/kernel/setup.c
> @@ -619,7 +619,7 @@ setup_arch (char **cmdline_p)
>   		 * memory so we can avoid this problem.
>   		 */
>   		if (efi_mem_type(0xA0000) != EFI_CONVENTIONAL_MEMORY)
> -			conswitchp = &vga_con;
> +			vgacon_register_screen(&screen_info);
>   # endif
>   	}
>   #endif
> diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
> index 1aba7dc95132c..6c3fae62a9f6b 100644
> --- a/arch/mips/kernel/setup.c
> +++ b/arch/mips/kernel/setup.c
> @@ -794,7 +794,7 @@ void __init setup_arch(char **cmdline_p)
>   
>   #if defined(CONFIG_VT)
>   #if defined(CONFIG_VGA_CONSOLE)
> -	conswitchp = &vga_con;
> +	vgacon_register_screen(&screen_info);
>   #endif
>   #endif
>   
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index fd975a4a52006..b1ea77d504615 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -1293,7 +1293,7 @@ void __init setup_arch(char **cmdline_p)
>   #ifdef CONFIG_VT
>   #if defined(CONFIG_VGA_CONSOLE)
>   	if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
> -		conswitchp = &vga_con;
> +		vgacon_register_screen(&screen_info);
>   #endif
>   #endif
>   	x86_init.oem.banner();
> diff --git a/drivers/firmware/pcdp.c b/drivers/firmware/pcdp.c
> index 715a45442d1cf..667a595373b2d 100644
> --- a/drivers/firmware/pcdp.c
> +++ b/drivers/firmware/pcdp.c
> @@ -72,7 +72,7 @@ setup_vga_console(struct pcdp_device *dev)
>   		return -ENODEV;
>   	}
>   
> -	conswitchp = &vga_con;
> +	vgacon_register_screen(&screen_info);
>   	printk(KERN_INFO "PCDP: VGA console\n");
>   	return 0;
>   #else
> diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
> index e25ba523892e5..3d7fedf27ffc1 100644
> --- a/drivers/video/console/vgacon.c
> +++ b/drivers/video/console/vgacon.c
> @@ -97,6 +97,8 @@ static int 		vga_video_font_height;
>   static int 		vga_scan_lines		__read_mostly;
>   static unsigned int 	vga_rolled_over; /* last vc_origin offset before wrap */
>   
> +static struct screen_info *vga_si;
> +
>   static bool vga_hardscroll_enabled;
>   static bool vga_hardscroll_user_enable = true;
>   
> @@ -161,8 +163,9 @@ static const char *vgacon_startup(void)
>   	u16 saved1, saved2;
>   	volatile u16 *p;
>   
> -	if (screen_info.orig_video_isVGA == VIDEO_TYPE_VLFB ||
> -	    screen_info.orig_video_isVGA == VIDEO_TYPE_EFI) {
> +	if (!vga_si ||
> +	    vga_si->orig_video_isVGA == VIDEO_TYPE_VLFB ||
> +	    vga_si->orig_video_isVGA == VIDEO_TYPE_EFI) {
>   	      no_vga:
>   #ifdef CONFIG_DUMMY_CONSOLE
>   		conswitchp = &dummy_con;
> @@ -172,29 +175,29 @@ static const char *vgacon_startup(void)
>   #endif
>   	}
>   
> -	/* boot_params.screen_info reasonably initialized? */
> -	if ((screen_info.orig_video_lines == 0) ||
> -	    (screen_info.orig_video_cols  == 0))
> +	/* vga_si reasonably initialized? */
> +	if ((vga_si->orig_video_lines == 0) ||
> +	    (vga_si->orig_video_cols  == 0))
>   		goto no_vga;
>   
>   	/* VGA16 modes are not handled by VGACON */
> -	if ((screen_info.orig_video_mode == 0x0D) ||	/* 320x200/4 */
> -	    (screen_info.orig_video_mode == 0x0E) ||	/* 640x200/4 */
> -	    (screen_info.orig_video_mode == 0x10) ||	/* 640x350/4 */
> -	    (screen_info.orig_video_mode == 0x12) ||	/* 640x480/4 */
> -	    (screen_info.orig_video_mode == 0x6A))	/* 800x600/4 (VESA) */
> +	if ((vga_si->orig_video_mode == 0x0D) ||	/* 320x200/4 */
> +	    (vga_si->orig_video_mode == 0x0E) ||	/* 640x200/4 */
> +	    (vga_si->orig_video_mode == 0x10) ||	/* 640x350/4 */
> +	    (vga_si->orig_video_mode == 0x12) ||	/* 640x480/4 */
> +	    (vga_si->orig_video_mode == 0x6A))	/* 800x600/4 (VESA) */
>   		goto no_vga;
>   
> -	vga_video_num_lines = screen_info.orig_video_lines;
> -	vga_video_num_columns = screen_info.orig_video_cols;
> +	vga_video_num_lines = vga_si->orig_video_lines;
> +	vga_video_num_columns = vga_si->orig_video_cols;
>   	vgastate.vgabase = NULL;
>   
> -	if (screen_info.orig_video_mode == 7) {
> +	if (vga_si->orig_video_mode == 7) {
>   		/* Monochrome display */
>   		vga_vram_base = 0xb0000;
>   		vga_video_port_reg = VGA_CRT_IM;
>   		vga_video_port_val = VGA_CRT_DM;
> -		if ((screen_info.orig_video_ega_bx & 0xff) != 0x10) {
> +		if ((vga_si->orig_video_ega_bx & 0xff) != 0x10) {
>   			static struct resource ega_console_resource =
>   			    { .name	= "ega",
>   			      .flags	= IORESOURCE_IO,
> @@ -231,12 +234,12 @@ static const char *vgacon_startup(void)
>   		vga_vram_base = 0xb8000;
>   		vga_video_port_reg = VGA_CRT_IC;
>   		vga_video_port_val = VGA_CRT_DC;
> -		if ((screen_info.orig_video_ega_bx & 0xff) != 0x10) {
> +		if ((vga_si->orig_video_ega_bx & 0xff) != 0x10) {
>   			int i;
>   
>   			vga_vram_size = 0x8000;
>   
> -			if (!screen_info.orig_video_isVGA) {
> +			if (!vga_si->orig_video_isVGA) {
>   				static struct resource ega_console_resource =
>   				    { .name	= "ega",
>   				      .flags	= IORESOURCE_IO,
> @@ -327,14 +330,14 @@ static const char *vgacon_startup(void)
>   	    || vga_video_type == VIDEO_TYPE_VGAC
>   	    || vga_video_type == VIDEO_TYPE_EGAM) {
>   		vga_hardscroll_enabled = vga_hardscroll_user_enable;
> -		vga_default_font_height = screen_info.orig_video_points;
> -		vga_video_font_height = screen_info.orig_video_points;
> +		vga_default_font_height = vga_si->orig_video_points;
> +		vga_video_font_height = vga_si->orig_video_points;
>   		/* This may be suboptimal but is a safe bet - go with it */
>   		vga_scan_lines =
>   		    vga_video_font_height * vga_video_num_lines;
>   	}
>   
> -	vgacon_xres = screen_info.orig_video_cols * VGA_FONTWIDTH;
> +	vgacon_xres = vga_si->orig_video_cols * VGA_FONTWIDTH;
>   	vgacon_yres = vga_scan_lines;
>   
>   	return display_desc;
> @@ -379,7 +382,7 @@ static void vgacon_init(struct vc_data *c, int init)
>   	/* Only set the default if the user didn't deliberately override it */
>   	if (global_cursor_default == -1)
>   		global_cursor_default =
> -			!(screen_info.flags & VIDEO_FLAGS_NOCURSOR);
> +			!(vga_si->flags & VIDEO_FLAGS_NOCURSOR);
>   }
>   
>   static void vgacon_deinit(struct vc_data *c)
> @@ -607,7 +610,7 @@ static int vgacon_switch(struct vc_data *c)
>   {
>   	int x = c->vc_cols * VGA_FONTWIDTH;
>   	int y = c->vc_rows * c->vc_cell_height;
> -	int rows = screen_info.orig_video_lines * vga_default_font_height/
> +	int rows = vga_si->orig_video_lines * vga_default_font_height/
>   		c->vc_cell_height;
>   	/*
>   	 * We need to save screen size here as it's the only way
> @@ -627,7 +630,7 @@ static int vgacon_switch(struct vc_data *c)
>   
>   		if ((vgacon_xres != x || vgacon_yres != y) &&
>   		    (!(vga_video_num_columns % 2) &&
> -		     vga_video_num_columns <= screen_info.orig_video_cols &&
> +		     vga_video_num_columns <= vga_si->orig_video_cols &&
>   		     vga_video_num_lines <= rows))
>   			vgacon_doresize(c, c->vc_cols, c->vc_rows);
>   	}
> @@ -1074,13 +1077,13 @@ static int vgacon_resize(struct vc_data *c, unsigned int width,
>   		 * Ho ho!  Someone (svgatextmode, eh?) may have reprogrammed
>   		 * the video mode!  Set the new defaults then and go away.
>   		 */
> -		screen_info.orig_video_cols = width;
> -		screen_info.orig_video_lines = height;
> +		vga_si->orig_video_cols = width;
> +		vga_si->orig_video_lines = height;
>   		vga_default_font_height = c->vc_cell_height;
>   		return 0;
>   	}
> -	if (width % 2 || width > screen_info.orig_video_cols ||
> -	    height > (screen_info.orig_video_lines * vga_default_font_height)/
> +	if (width % 2 || width > vga_si->orig_video_cols ||
> +	    height > (vga_si->orig_video_lines * vga_default_font_height)/
>   	    c->vc_cell_height)
>   		return -EINVAL;
>   
> @@ -1110,8 +1113,8 @@ static void vgacon_save_screen(struct vc_data *c)
>   		 * console initialization routines.
>   		 */
>   		vga_bootup_console = 1;
> -		c->state.x = screen_info.orig_x;
> -		c->state.y = screen_info.orig_y;
> +		c->state.x = vga_si->orig_x;
> +		c->state.y = vga_si->orig_y;
>   	}
>   
>   	/* We can't copy in more than the size of the video buffer,
> @@ -1204,4 +1207,13 @@ const struct consw vga_con = {
>   };
>   EXPORT_SYMBOL(vga_con);
>   
> +void vgacon_register_screen(struct screen_info *si)
> +{
> +	if (!si || vga_si)
> +		return;
> +
> +	conswitchp = &vga_con;
> +	vga_si = si;
> +}
> +
>   MODULE_LICENSE("GPL");
> diff --git a/include/linux/console.h b/include/linux/console.h
> index d3195664baa5a..5f900210e689e 100644
> --- a/include/linux/console.h
> +++ b/include/linux/console.h
> @@ -101,6 +101,13 @@ extern const struct consw dummy_con;	/* dummy console buffer */
>   extern const struct consw vga_con;	/* VGA text console */
>   extern const struct consw newport_con;	/* SGI Newport console  */
>   
> +struct screen_info;
> +#ifdef CONFIG_VGA_CONSOLE
> +void vgacon_register_screen(struct screen_info *si);
> +#else
> +static inline void vgacon_register_screen(struct screen_info *si) { }
> +#endif
> +
>   int con_is_bound(const struct consw *csw);
>   int do_unregister_con_driver(const struct consw *csw);
>   int do_take_over_console(const struct consw *sw, int first, int last, int deflt);

[PATCH v2 6/9] vgacon: clean up global screen_info instances

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

To prepare for completely separating the VGA console screen_info from
the one used in EFI/sysfb, rename the vgacon instances and make them
local as much as possible.

ia64 and arm both have confurations with vgacon and efi, but the contents
never overlaps because ia64 has no EFI framebuffer, and arm only has
vga console on legacy platforms without EFI. Renaming these is required
before the EFI screen_info can be moved into drivers/firmware.

The ia64 vga console is actually registered in two places from
setup_arch(), but one of them is wrong, so drop the one in pcdp.c and
the fix the one in setup.c to use the correct conditional.

x86 has to keep them together, as the boot protocol is used to switch
between VGA text console and framebuffer through the screen_info data.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/alpha/kernel/proto.h         |  2 ++
 arch/alpha/kernel/setup.c         |  6 ++--
 arch/alpha/kernel/sys_sio.c       |  6 ++--
 arch/arm/include/asm/setup.h      |  5 ++++
 arch/arm/kernel/atags_parse.c     | 18 ++++++------
 arch/arm/kernel/efi.c             |  6 ----
 arch/arm/kernel/setup.c           | 10 +++++--
 arch/ia64/kernel/setup.c          | 49 +++++++++++++++----------------
 arch/mips/kernel/setup.c          | 11 -------
 arch/mips/mti-malta/malta-setup.c |  4 ++-
 arch/mips/sibyte/swarm/setup.c    | 24 ++++++++-------
 arch/mips/sni/setup.c             | 16 +++++-----
 drivers/firmware/pcdp.c           |  1 -
 13 files changed, 78 insertions(+), 80 deletions(-)

diff --git a/arch/alpha/kernel/proto.h b/arch/alpha/kernel/proto.h
index 5816a31c1b386..2c89c1c557129 100644
--- a/arch/alpha/kernel/proto.h
+++ b/arch/alpha/kernel/proto.h
@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 #include <linux/interrupt.h>
+#include <linux/screen_info.h>
 #include <linux/io.h>
 
 /* Prototypes of functions used across modules here in this directory.  */
@@ -113,6 +114,7 @@ extern int boot_cpuid;
 #ifdef CONFIG_VERBOSE_MCHECK
 extern unsigned long alpha_verbose_mcheck;
 #endif
+extern struct screen_info vgacon_screen_info;
 
 /* srmcons.c */
 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_SRM)
diff --git a/arch/alpha/kernel/setup.c b/arch/alpha/kernel/setup.c
index d73b685fe9852..7b35af2ed2787 100644
--- a/arch/alpha/kernel/setup.c
+++ b/arch/alpha/kernel/setup.c
@@ -138,7 +138,7 @@ static char __initdata command_line[COMMAND_LINE_SIZE];
  * code think we're on a VGA color display.
  */
 
-struct screen_info screen_info = {
+struct screen_info vgacon_screen_info = {
 	.orig_x = 0,
 	.orig_y = 25,
 	.orig_video_cols = 80,
@@ -146,8 +146,6 @@ struct screen_info screen_info = {
 	.orig_video_isVGA = 1,
 	.orig_video_points = 16
 };
-
-EXPORT_SYMBOL(screen_info);
 #endif
 
 /*
@@ -655,7 +653,7 @@ setup_arch(char **cmdline_p)
 
 #ifdef CONFIG_VT
 #if defined(CONFIG_VGA_CONSOLE)
-	vgacon_register_screen(&screen_info);
+	vgacon_register_screen(&vgacon_screen_info);
 #endif
 #endif
 
diff --git a/arch/alpha/kernel/sys_sio.c b/arch/alpha/kernel/sys_sio.c
index 7de8a5d2d2066..086488ed83a7f 100644
--- a/arch/alpha/kernel/sys_sio.c
+++ b/arch/alpha/kernel/sys_sio.c
@@ -60,9 +60,9 @@ alphabook1_init_arch(void)
 #ifdef CONFIG_VGA_CONSOLE
 	/* The AlphaBook1 has LCD video fixed at 800x600,
 	   37 rows and 100 cols. */
-	screen_info.orig_y = 37;
-	screen_info.orig_video_cols = 100;
-	screen_info.orig_video_lines = 37;
+	vgacon_screen_info.orig_y = 37;
+	vgacon_screen_info.orig_video_cols = 100;
+	vgacon_screen_info.orig_video_lines = 37;
 #endif
 
 	lca_init_arch();
diff --git a/arch/arm/include/asm/setup.h b/arch/arm/include/asm/setup.h
index 546af8b1e3f65..cc106f946c691 100644
--- a/arch/arm/include/asm/setup.h
+++ b/arch/arm/include/asm/setup.h
@@ -11,6 +11,7 @@
 #ifndef __ASMARM_SETUP_H
 #define __ASMARM_SETUP_H
 
+#include <linux/screen_info.h>
 #include <uapi/asm/setup.h>
 
 
@@ -35,4 +36,8 @@ void early_mm_init(const struct machine_desc *);
 void adjust_lowmem_bounds(void);
 void setup_dma_zone(const struct machine_desc *desc);
 
+#ifdef CONFIG_VGA_CONSOLE
+extern struct screen_info vgacon_screen_info;
+#endif
+
 #endif
diff --git a/arch/arm/kernel/atags_parse.c b/arch/arm/kernel/atags_parse.c
index 4c815da3b77b0..4ec591bde3dfa 100644
--- a/arch/arm/kernel/atags_parse.c
+++ b/arch/arm/kernel/atags_parse.c
@@ -72,15 +72,15 @@ __tagtable(ATAG_MEM, parse_tag_mem32);
 #if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_VGA_CONSOLE)
 static int __init parse_tag_videotext(const struct tag *tag)
 {
-	screen_info.orig_x            = tag->u.videotext.x;
-	screen_info.orig_y            = tag->u.videotext.y;
-	screen_info.orig_video_page   = tag->u.videotext.video_page;
-	screen_info.orig_video_mode   = tag->u.videotext.video_mode;
-	screen_info.orig_video_cols   = tag->u.videotext.video_cols;
-	screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
-	screen_info.orig_video_lines  = tag->u.videotext.video_lines;
-	screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
-	screen_info.orig_video_points = tag->u.videotext.video_points;
+	vgacon_screen_info.orig_x            = tag->u.videotext.x;
+	vgacon_screen_info.orig_y            = tag->u.videotext.y;
+	vgacon_screen_info.orig_video_page   = tag->u.videotext.video_page;
+	vgacon_screen_info.orig_video_mode   = tag->u.videotext.video_mode;
+	vgacon_screen_info.orig_video_cols   = tag->u.videotext.video_cols;
+	vgacon_screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
+	vgacon_screen_info.orig_video_lines  = tag->u.videotext.video_lines;
+	vgacon_screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
+	vgacon_screen_info.orig_video_points = tag->u.videotext.video_points;
 	return 0;
 }
 
diff --git a/arch/arm/kernel/efi.c b/arch/arm/kernel/efi.c
index e94655ef16bb3..6f9ec7d28a710 100644
--- a/arch/arm/kernel/efi.c
+++ b/arch/arm/kernel/efi.c
@@ -123,12 +123,6 @@ void __init arm_efi_init(void)
 {
 	efi_init();
 
-	if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI) {
-		/* dummycon on ARM needs non-zero values for columns/lines */
-		screen_info.orig_video_cols = 80;
-		screen_info.orig_video_lines = 25;
-	}
-
 	/* ARM does not permit early mappings to persist across paging_init() */
 	efi_memmap_unmap();
 
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 5d8a7fb3eba45..86c2751f56dcf 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -928,8 +928,8 @@ static void __init request_standard_resources(const struct machine_desc *mdesc)
 		request_resource(&ioport_resource, &lp2);
 }
 
-#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_EFI)
-struct screen_info screen_info = {
+#if defined(CONFIG_VGA_CONSOLE)
+static struct screen_info vgacon_screen_info = {
  .orig_video_lines	= 30,
  .orig_video_cols	= 80,
  .orig_video_mode	= 0,
@@ -939,6 +939,10 @@ struct screen_info screen_info = {
 };
 #endif
 
+#if defined(CONFIG_EFI)
+struct screen_info screen_info;
+#endif
+
 static int __init customize_machine(void)
 {
 	/*
@@ -1192,7 +1196,7 @@ void __init setup_arch(char **cmdline_p)
 
 #ifdef CONFIG_VT
 #if defined(CONFIG_VGA_CONSOLE)
-	vgacon_register_screen(&screen_info);
+	vgacon_register_screen(&vgacon_screen_info);
 #endif
 #endif
 
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index 2c9283fcd3759..82feae1323f40 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -86,7 +86,8 @@ EXPORT_SYMBOL(local_per_cpu_offset);
 #endif
 unsigned long ia64_cycles_per_usec;
 struct ia64_boot_param *ia64_boot_param;
-#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_EFI)
+#if defined(CONFIG_EFI)
+/* No longer used on ia64, but needed for linking */
 struct screen_info screen_info;
 #endif
 #ifdef CONFIG_VGA_CONSOLE
@@ -503,8 +504,9 @@ screen_info_setup(void)
 {
 #ifdef CONFIG_VGA_CONSOLE
 	unsigned int orig_x, orig_y, num_cols, num_rows, font_height;
+	static struct screen_info si;
 
-	memset(&screen_info, 0, sizeof(screen_info));
+	memset(&si, 0, sizeof(si));
 
 	if (!ia64_boot_param->console_info.num_rows ||
 	    !ia64_boot_param->console_info.num_cols) {
@@ -522,14 +524,26 @@ screen_info_setup(void)
 		font_height = 400 / num_rows;
 	}
 
-	screen_info.orig_x = orig_x;
-	screen_info.orig_y = orig_y;
-	screen_info.orig_video_cols  = num_cols;
-	screen_info.orig_video_lines = num_rows;
-	screen_info.orig_video_points = font_height;
-	screen_info.orig_video_mode = 3;	/* XXX fake */
-	screen_info.orig_video_isVGA = 1;	/* XXX fake */
-	screen_info.orig_video_ega_bx = 3;	/* XXX fake */
+	si.orig_x = orig_x;
+	si.orig_y = orig_y;
+	si.orig_video_cols  = num_cols;
+	si.orig_video_lines = num_rows;
+	si.orig_video_points = font_height;
+	si.orig_video_mode = 3;	/* XXX fake */
+	si.orig_video_isVGA = 1;	/* XXX fake */
+	si.orig_video_ega_bx = 3;	/* XXX fake */
+
+	if (!conswitchp) {
+		/*
+		 * Non-legacy systems may route legacy VGA MMIO range to system
+		 * memory.  vga_con probes the MMIO hole, so memory looks like
+		 * a VGA device to it.  The EFI memory map can tell us if it's
+		 * memory so we can avoid this problem.
+		 */
+		if (efi_mem_type(vga_console_membase + 0xA0000) !=
+		    EFI_CONVENTIONAL_MEMORY) {
+			vgacon_register_screen(&si);
+	}
 #endif
 }
 
@@ -609,21 +623,6 @@ setup_arch (char **cmdline_p)
 	cpu_init();	/* initialize the bootstrap CPU */
 	mmu_context_init();	/* initialize context_id bitmap */
 
-#ifdef CONFIG_VT
-	if (!conswitchp) {
-# if defined(CONFIG_VGA_CONSOLE)
-		/*
-		 * Non-legacy systems may route legacy VGA MMIO range to system
-		 * memory.  vga_con probes the MMIO hole, so memory looks like
-		 * a VGA device to it.  The EFI memory map can tell us if it's
-		 * memory so we can avoid this problem.
-		 */
-		if (efi_mem_type(0xA0000) != EFI_CONVENTIONAL_MEMORY)
-			vgacon_register_screen(&screen_info);
-# endif
-	}
-#endif
-
 	/* enable IA-64 Machine Check Abort Handling unless disabled */
 	if (!nomca)
 		ia64_mca_init();
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 6c3fae62a9f6b..cae181bbfee10 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -15,7 +15,6 @@
 #include <linux/delay.h>
 #include <linux/ioport.h>
 #include <linux/export.h>
-#include <linux/screen_info.h>
 #include <linux/memblock.h>
 #include <linux/initrd.h>
 #include <linux/root_dev.h>
@@ -54,10 +53,6 @@ struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
 
 EXPORT_SYMBOL(cpu_data);
 
-#ifdef CONFIG_VGA_CONSOLE
-struct screen_info screen_info;
-#endif
-
 /*
  * Setup information
  *
@@ -792,12 +787,6 @@ void __init setup_arch(char **cmdline_p)
 	if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64))
 		check_bugs64_early();
 
-#if defined(CONFIG_VT)
-#if defined(CONFIG_VGA_CONSOLE)
-	vgacon_register_screen(&screen_info);
-#endif
-#endif
-
 	arch_mem_init(cmdline_p);
 	dmi_setup();
 
diff --git a/arch/mips/mti-malta/malta-setup.c b/arch/mips/mti-malta/malta-setup.c
index 21cb3ac1237b7..3a2836e9d8566 100644
--- a/arch/mips/mti-malta/malta-setup.c
+++ b/arch/mips/mti-malta/malta-setup.c
@@ -161,7 +161,7 @@ static void __init pci_clock_check(void)
 #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
 static void __init screen_info_setup(void)
 {
-	screen_info = (struct screen_info) {
+	static struct screen_info si = {
 		.orig_x = 0,
 		.orig_y = 25,
 		.ext_mem_k = 0,
@@ -175,6 +175,8 @@ static void __init screen_info_setup(void)
 		.orig_video_isVGA = VIDEO_TYPE_VGAC,
 		.orig_video_points = 16
 	};
+
+	vgacon_register_screen(&si);
 }
 #endif
 
diff --git a/arch/mips/sibyte/swarm/setup.c b/arch/mips/sibyte/swarm/setup.c
index 37df504d3ecbb..74e7c242b6902 100644
--- a/arch/mips/sibyte/swarm/setup.c
+++ b/arch/mips/sibyte/swarm/setup.c
@@ -112,6 +112,19 @@ int update_persistent_clock64(struct timespec64 now)
 	}
 }
 
+#ifdef CONFIG_VGA_CONSOLE
+static struct screen_info vgacon_screen_info = {
+	.orig_video_page	= 52,
+	.orig_video_mode	= 3,
+	.orig_video_cols	= 80,
+	.flags			= 12,
+	.orig_video_ega_bx	= 3,
+	.orig_video_lines	= 25,
+	.orig_video_isVGA	= 0x22,
+	.orig_video_points	= 16,
+};
+#endif
+
 void __init plat_mem_setup(void)
 {
 #ifdef CONFIG_SIBYTE_BCM1x80
@@ -130,16 +143,7 @@ void __init plat_mem_setup(void)
 		swarm_rtc_type = RTC_M41T81;
 
 #ifdef CONFIG_VGA_CONSOLE
-	screen_info = (struct screen_info) {
-		.orig_video_page	= 52,
-		.orig_video_mode	= 3,
-		.orig_video_cols	= 80,
-		.flags			= 12,
-		.orig_video_ega_bx	= 3,
-		.orig_video_lines	= 25,
-		.orig_video_isVGA	= 0x22,
-		.orig_video_points	= 16,
-       };
+	vgacon_register_screen(&vgacon_screen_info);
        /* XXXKW for CFE, get lines/cols from environment */
 #endif
 }
diff --git a/arch/mips/sni/setup.c b/arch/mips/sni/setup.c
index 9984cf91be7d0..42fdb939c88d8 100644
--- a/arch/mips/sni/setup.c
+++ b/arch/mips/sni/setup.c
@@ -39,18 +39,20 @@ extern void sni_machine_power_off(void);
 static void __init sni_display_setup(void)
 {
 #if defined(CONFIG_VGA_CONSOLE) && defined(CONFIG_FW_ARC)
-	struct screen_info *si = &screen_info;
+	static struct screen_info si;
 	DISPLAY_STATUS *di;
 
 	di = ArcGetDisplayStatus(1);
 
 	if (di) {
-		si->orig_x		= di->CursorXPosition;
-		si->orig_y		= di->CursorYPosition;
-		si->orig_video_cols	= di->CursorMaxXPosition;
-		si->orig_video_lines	= di->CursorMaxYPosition;
-		si->orig_video_isVGA	= VIDEO_TYPE_VGAC;
-		si->orig_video_points	= 16;
+		si.orig_x		= di->CursorXPosition;
+		si.orig_y		= di->CursorYPosition;
+		si.orig_video_cols	= di->CursorMaxXPosition;
+		si.orig_video_lines	= di->CursorMaxYPosition;
+		si.orig_video_isVGA	= VIDEO_TYPE_VGAC;
+		si.orig_video_points	= 16;
+
+		vgacon_register_screen(&si);
 	}
 #endif
 }
diff --git a/drivers/firmware/pcdp.c b/drivers/firmware/pcdp.c
index 667a595373b2d..876b3e9b37e25 100644
--- a/drivers/firmware/pcdp.c
+++ b/drivers/firmware/pcdp.c
@@ -72,7 +72,6 @@ setup_vga_console(struct pcdp_device *dev)
 		return -ENODEV;
 	}
 
-	vgacon_register_screen(&screen_info);
 	printk(KERN_INFO "PCDP: VGA console\n");
 	return 0;
 #else
-- 
2.39.2

Re: [PATCH v2 6/9] vgacon: clean up global screen_info instances

[Javier Martinez Canillas]

Arnd Bergmann <arnd@kernel.org> writes:

> From: Arnd Bergmann <arnd@arndb.de>
>
> To prepare for completely separating the VGA console screen_info from
> the one used in EFI/sysfb, rename the vgacon instances and make them
> local as much as possible.
>
> ia64 and arm both have confurations with vgacon and efi, but the contents

is this a typo for configurations ?

> never overlaps because ia64 has no EFI framebuffer, and arm only has
> vga console on legacy platforms without EFI. Renaming these is required
> before the EFI screen_info can be moved into drivers/firmware.
>
> The ia64 vga console is actually registered in two places from
> setup_arch(), but one of them is wrong, so drop the one in pcdp.c and
> the fix the one in setup.c to use the correct conditional.
>

s/the fix the/fix the

> x86 has to keep them together, as the boot protocol is used to switch
> between VGA text console and framebuffer through the screen_info data.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---

Patch looks good to me, but I'm not that familiar with some of the arches
to give a proper reviewed-by.

Acked-by: Javier Martinez Canillas <javierm@redhat.com>

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat

Re: [PATCH v2 6/9] vgacon: clean up global screen_info instances

[Khalid Aziz]

On 7/19/23 6:39 AM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> To prepare for completely separating the VGA console screen_info from
> the one used in EFI/sysfb, rename the vgacon instances and make them
> local as much as possible.
> 
> ia64 and arm both have confurations with vgacon and efi, but the contents
> never overlaps because ia64 has no EFI framebuffer, and arm only has
> vga console on legacy platforms without EFI. Renaming these is required
> before the EFI screen_info can be moved into drivers/firmware.
> 
> The ia64 vga console is actually registered in two places from
> setup_arch(), but one of them is wrong, so drop the one in pcdp.c and
> the fix the one in setup.c to use the correct conditional.
> 
> x86 has to keep them together, as the boot protocol is used to switch
> between VGA text console and framebuffer through the screen_info data.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>


PCDP and ia64 changes are reasonable.

Acked-by: Khalid Aziz <khalid@gonehiking.org>

> ---
>   arch/alpha/kernel/proto.h         |  2 ++
>   arch/alpha/kernel/setup.c         |  6 ++--
>   arch/alpha/kernel/sys_sio.c       |  6 ++--
>   arch/arm/include/asm/setup.h      |  5 ++++
>   arch/arm/kernel/atags_parse.c     | 18 ++++++------
>   arch/arm/kernel/efi.c             |  6 ----
>   arch/arm/kernel/setup.c           | 10 +++++--
>   arch/ia64/kernel/setup.c          | 49 +++++++++++++++----------------
>   arch/mips/kernel/setup.c          | 11 -------
>   arch/mips/mti-malta/malta-setup.c |  4 ++-
>   arch/mips/sibyte/swarm/setup.c    | 24 ++++++++-------
>   arch/mips/sni/setup.c             | 16 +++++-----
>   drivers/firmware/pcdp.c           |  1 -
>   13 files changed, 78 insertions(+), 80 deletions(-)
> 
> diff --git a/arch/alpha/kernel/proto.h b/arch/alpha/kernel/proto.h
> index 5816a31c1b386..2c89c1c557129 100644
> --- a/arch/alpha/kernel/proto.h
> +++ b/arch/alpha/kernel/proto.h
> @@ -1,5 +1,6 @@
>   /* SPDX-License-Identifier: GPL-2.0 */
>   #include <linux/interrupt.h>
> +#include <linux/screen_info.h>
>   #include <linux/io.h>
>   
>   /* Prototypes of functions used across modules here in this directory.  */
> @@ -113,6 +114,7 @@ extern int boot_cpuid;
>   #ifdef CONFIG_VERBOSE_MCHECK
>   extern unsigned long alpha_verbose_mcheck;
>   #endif
> +extern struct screen_info vgacon_screen_info;
>   
>   /* srmcons.c */
>   #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_SRM)
> diff --git a/arch/alpha/kernel/setup.c b/arch/alpha/kernel/setup.c
> index d73b685fe9852..7b35af2ed2787 100644
> --- a/arch/alpha/kernel/setup.c
> +++ b/arch/alpha/kernel/setup.c
> @@ -138,7 +138,7 @@ static char __initdata command_line[COMMAND_LINE_SIZE];
>    * code think we're on a VGA color display.
>    */
>   
> -struct screen_info screen_info = {
> +struct screen_info vgacon_screen_info = {
>   	.orig_x = 0,
>   	.orig_y = 25,
>   	.orig_video_cols = 80,
> @@ -146,8 +146,6 @@ struct screen_info screen_info = {
>   	.orig_video_isVGA = 1,
>   	.orig_video_points = 16
>   };
> -
> -EXPORT_SYMBOL(screen_info);
>   #endif
>   
>   /*
> @@ -655,7 +653,7 @@ setup_arch(char **cmdline_p)
>   
>   #ifdef CONFIG_VT
>   #if defined(CONFIG_VGA_CONSOLE)
> -	vgacon_register_screen(&screen_info);
> +	vgacon_register_screen(&vgacon_screen_info);
>   #endif
>   #endif
>   
> diff --git a/arch/alpha/kernel/sys_sio.c b/arch/alpha/kernel/sys_sio.c
> index 7de8a5d2d2066..086488ed83a7f 100644
> --- a/arch/alpha/kernel/sys_sio.c
> +++ b/arch/alpha/kernel/sys_sio.c
> @@ -60,9 +60,9 @@ alphabook1_init_arch(void)
>   #ifdef CONFIG_VGA_CONSOLE
>   	/* The AlphaBook1 has LCD video fixed at 800x600,
>   	   37 rows and 100 cols. */
> -	screen_info.orig_y = 37;
> -	screen_info.orig_video_cols = 100;
> -	screen_info.orig_video_lines = 37;
> +	vgacon_screen_info.orig_y = 37;
> +	vgacon_screen_info.orig_video_cols = 100;
> +	vgacon_screen_info.orig_video_lines = 37;
>   #endif
>   
>   	lca_init_arch();
> diff --git a/arch/arm/include/asm/setup.h b/arch/arm/include/asm/setup.h
> index 546af8b1e3f65..cc106f946c691 100644
> --- a/arch/arm/include/asm/setup.h
> +++ b/arch/arm/include/asm/setup.h
> @@ -11,6 +11,7 @@
>   #ifndef __ASMARM_SETUP_H
>   #define __ASMARM_SETUP_H
>   
> +#include <linux/screen_info.h>
>   #include <uapi/asm/setup.h>
>   
>   
> @@ -35,4 +36,8 @@ void early_mm_init(const struct machine_desc *);
>   void adjust_lowmem_bounds(void);
>   void setup_dma_zone(const struct machine_desc *desc);
>   
> +#ifdef CONFIG_VGA_CONSOLE
> +extern struct screen_info vgacon_screen_info;
> +#endif
> +
>   #endif
> diff --git a/arch/arm/kernel/atags_parse.c b/arch/arm/kernel/atags_parse.c
> index 4c815da3b77b0..4ec591bde3dfa 100644
> --- a/arch/arm/kernel/atags_parse.c
> +++ b/arch/arm/kernel/atags_parse.c
> @@ -72,15 +72,15 @@ __tagtable(ATAG_MEM, parse_tag_mem32);
>   #if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_VGA_CONSOLE)
>   static int __init parse_tag_videotext(const struct tag *tag)
>   {
> -	screen_info.orig_x            = tag->u.videotext.x;
> -	screen_info.orig_y            = tag->u.videotext.y;
> -	screen_info.orig_video_page   = tag->u.videotext.video_page;
> -	screen_info.orig_video_mode   = tag->u.videotext.video_mode;
> -	screen_info.orig_video_cols   = tag->u.videotext.video_cols;
> -	screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
> -	screen_info.orig_video_lines  = tag->u.videotext.video_lines;
> -	screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
> -	screen_info.orig_video_points = tag->u.videotext.video_points;
> +	vgacon_screen_info.orig_x            = tag->u.videotext.x;
> +	vgacon_screen_info.orig_y            = tag->u.videotext.y;
> +	vgacon_screen_info.orig_video_page   = tag->u.videotext.video_page;
> +	vgacon_screen_info.orig_video_mode   = tag->u.videotext.video_mode;
> +	vgacon_screen_info.orig_video_cols   = tag->u.videotext.video_cols;
> +	vgacon_screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
> +	vgacon_screen_info.orig_video_lines  = tag->u.videotext.video_lines;
> +	vgacon_screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
> +	vgacon_screen_info.orig_video_points = tag->u.videotext.video_points;
>   	return 0;
>   }
>   
> diff --git a/arch/arm/kernel/efi.c b/arch/arm/kernel/efi.c
> index e94655ef16bb3..6f9ec7d28a710 100644
> --- a/arch/arm/kernel/efi.c
> +++ b/arch/arm/kernel/efi.c
> @@ -123,12 +123,6 @@ void __init arm_efi_init(void)
>   {
>   	efi_init();
>   
> -	if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI) {
> -		/* dummycon on ARM needs non-zero values for columns/lines */
> -		screen_info.orig_video_cols = 80;
> -		screen_info.orig_video_lines = 25;
> -	}
> -
>   	/* ARM does not permit early mappings to persist across paging_init() */
>   	efi_memmap_unmap();
>   
> diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
> index 5d8a7fb3eba45..86c2751f56dcf 100644
> --- a/arch/arm/kernel/setup.c
> +++ b/arch/arm/kernel/setup.c
> @@ -928,8 +928,8 @@ static void __init request_standard_resources(const struct machine_desc *mdesc)
>   		request_resource(&ioport_resource, &lp2);
>   }
>   
> -#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_EFI)
> -struct screen_info screen_info = {
> +#if defined(CONFIG_VGA_CONSOLE)
> +static struct screen_info vgacon_screen_info = {
>    .orig_video_lines	= 30,
>    .orig_video_cols	= 80,
>    .orig_video_mode	= 0,
> @@ -939,6 +939,10 @@ struct screen_info screen_info = {
>   };
>   #endif
>   
> +#if defined(CONFIG_EFI)
> +struct screen_info screen_info;
> +#endif
> +
>   static int __init customize_machine(void)
>   {
>   	/*
> @@ -1192,7 +1196,7 @@ void __init setup_arch(char **cmdline_p)
>   
>   #ifdef CONFIG_VT
>   #if defined(CONFIG_VGA_CONSOLE)
> -	vgacon_register_screen(&screen_info);
> +	vgacon_register_screen(&vgacon_screen_info);
>   #endif
>   #endif
>   
> diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
> index 2c9283fcd3759..82feae1323f40 100644
> --- a/arch/ia64/kernel/setup.c
> +++ b/arch/ia64/kernel/setup.c
> @@ -86,7 +86,8 @@ EXPORT_SYMBOL(local_per_cpu_offset);
>   #endif
>   unsigned long ia64_cycles_per_usec;
>   struct ia64_boot_param *ia64_boot_param;
> -#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_EFI)
> +#if defined(CONFIG_EFI)
> +/* No longer used on ia64, but needed for linking */
>   struct screen_info screen_info;
>   #endif
>   #ifdef CONFIG_VGA_CONSOLE
> @@ -503,8 +504,9 @@ screen_info_setup(void)
>   {
>   #ifdef CONFIG_VGA_CONSOLE
>   	unsigned int orig_x, orig_y, num_cols, num_rows, font_height;
> +	static struct screen_info si;
>   
> -	memset(&screen_info, 0, sizeof(screen_info));
> +	memset(&si, 0, sizeof(si));
>   
>   	if (!ia64_boot_param->console_info.num_rows ||
>   	    !ia64_boot_param->console_info.num_cols) {
> @@ -522,14 +524,26 @@ screen_info_setup(void)
>   		font_height = 400 / num_rows;
>   	}
>   
> -	screen_info.orig_x = orig_x;
> -	screen_info.orig_y = orig_y;
> -	screen_info.orig_video_cols  = num_cols;
> -	screen_info.orig_video_lines = num_rows;
> -	screen_info.orig_video_points = font_height;
> -	screen_info.orig_video_mode = 3;	/* XXX fake */
> -	screen_info.orig_video_isVGA = 1;	/* XXX fake */
> -	screen_info.orig_video_ega_bx = 3;	/* XXX fake */
> +	si.orig_x = orig_x;
> +	si.orig_y = orig_y;
> +	si.orig_video_cols  = num_cols;
> +	si.orig_video_lines = num_rows;
> +	si.orig_video_points = font_height;
> +	si.orig_video_mode = 3;	/* XXX fake */
> +	si.orig_video_isVGA = 1;	/* XXX fake */
> +	si.orig_video_ega_bx = 3;	/* XXX fake */
> +
> +	if (!conswitchp) {
> +		/*
> +		 * Non-legacy systems may route legacy VGA MMIO range to system
> +		 * memory.  vga_con probes the MMIO hole, so memory looks like
> +		 * a VGA device to it.  The EFI memory map can tell us if it's
> +		 * memory so we can avoid this problem.
> +		 */
> +		if (efi_mem_type(vga_console_membase + 0xA0000) !=
> +		    EFI_CONVENTIONAL_MEMORY) {
> +			vgacon_register_screen(&si);
> +	}
>   #endif
>   }
>   
> @@ -609,21 +623,6 @@ setup_arch (char **cmdline_p)
>   	cpu_init();	/* initialize the bootstrap CPU */
>   	mmu_context_init();	/* initialize context_id bitmap */
>   
> -#ifdef CONFIG_VT
> -	if (!conswitchp) {
> -# if defined(CONFIG_VGA_CONSOLE)
> -		/*
> -		 * Non-legacy systems may route legacy VGA MMIO range to system
> -		 * memory.  vga_con probes the MMIO hole, so memory looks like
> -		 * a VGA device to it.  The EFI memory map can tell us if it's
> -		 * memory so we can avoid this problem.
> -		 */
> -		if (efi_mem_type(0xA0000) != EFI_CONVENTIONAL_MEMORY)
> -			vgacon_register_screen(&screen_info);
> -# endif
> -	}
> -#endif
> -
>   	/* enable IA-64 Machine Check Abort Handling unless disabled */
>   	if (!nomca)
>   		ia64_mca_init();
> diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
> index 6c3fae62a9f6b..cae181bbfee10 100644
> --- a/arch/mips/kernel/setup.c
> +++ b/arch/mips/kernel/setup.c
> @@ -15,7 +15,6 @@
>   #include <linux/delay.h>
>   #include <linux/ioport.h>
>   #include <linux/export.h>
> -#include <linux/screen_info.h>
>   #include <linux/memblock.h>
>   #include <linux/initrd.h>
>   #include <linux/root_dev.h>
> @@ -54,10 +53,6 @@ struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
>   
>   EXPORT_SYMBOL(cpu_data);
>   
> -#ifdef CONFIG_VGA_CONSOLE
> -struct screen_info screen_info;
> -#endif
> -
>   /*
>    * Setup information
>    *
> @@ -792,12 +787,6 @@ void __init setup_arch(char **cmdline_p)
>   	if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64))
>   		check_bugs64_early();
>   
> -#if defined(CONFIG_VT)
> -#if defined(CONFIG_VGA_CONSOLE)
> -	vgacon_register_screen(&screen_info);
> -#endif
> -#endif
> -
>   	arch_mem_init(cmdline_p);
>   	dmi_setup();
>   
> diff --git a/arch/mips/mti-malta/malta-setup.c b/arch/mips/mti-malta/malta-setup.c
> index 21cb3ac1237b7..3a2836e9d8566 100644
> --- a/arch/mips/mti-malta/malta-setup.c
> +++ b/arch/mips/mti-malta/malta-setup.c
> @@ -161,7 +161,7 @@ static void __init pci_clock_check(void)
>   #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
>   static void __init screen_info_setup(void)
>   {
> -	screen_info = (struct screen_info) {
> +	static struct screen_info si = {
>   		.orig_x = 0,
>   		.orig_y = 25,
>   		.ext_mem_k = 0,
> @@ -175,6 +175,8 @@ static void __init screen_info_setup(void)
>   		.orig_video_isVGA = VIDEO_TYPE_VGAC,
>   		.orig_video_points = 16
>   	};
> +
> +	vgacon_register_screen(&si);
>   }
>   #endif
>   
> diff --git a/arch/mips/sibyte/swarm/setup.c b/arch/mips/sibyte/swarm/setup.c
> index 37df504d3ecbb..74e7c242b6902 100644
> --- a/arch/mips/sibyte/swarm/setup.c
> +++ b/arch/mips/sibyte/swarm/setup.c
> @@ -112,6 +112,19 @@ int update_persistent_clock64(struct timespec64 now)
>   	}
>   }
>   
> +#ifdef CONFIG_VGA_CONSOLE
> +static struct screen_info vgacon_screen_info = {
> +	.orig_video_page	= 52,
> +	.orig_video_mode	= 3,
> +	.orig_video_cols	= 80,
> +	.flags			= 12,
> +	.orig_video_ega_bx	= 3,
> +	.orig_video_lines	= 25,
> +	.orig_video_isVGA	= 0x22,
> +	.orig_video_points	= 16,
> +};
> +#endif
> +
>   void __init plat_mem_setup(void)
>   {
>   #ifdef CONFIG_SIBYTE_BCM1x80
> @@ -130,16 +143,7 @@ void __init plat_mem_setup(void)
>   		swarm_rtc_type = RTC_M41T81;
>   
>   #ifdef CONFIG_VGA_CONSOLE
> -	screen_info = (struct screen_info) {
> -		.orig_video_page	= 52,
> -		.orig_video_mode	= 3,
> -		.orig_video_cols	= 80,
> -		.flags			= 12,
> -		.orig_video_ega_bx	= 3,
> -		.orig_video_lines	= 25,
> -		.orig_video_isVGA	= 0x22,
> -		.orig_video_points	= 16,
> -       };
> +	vgacon_register_screen(&vgacon_screen_info);
>          /* XXXKW for CFE, get lines/cols from environment */
>   #endif
>   }
> diff --git a/arch/mips/sni/setup.c b/arch/mips/sni/setup.c
> index 9984cf91be7d0..42fdb939c88d8 100644
> --- a/arch/mips/sni/setup.c
> +++ b/arch/mips/sni/setup.c
> @@ -39,18 +39,20 @@ extern void sni_machine_power_off(void);
>   static void __init sni_display_setup(void)
>   {
>   #if defined(CONFIG_VGA_CONSOLE) && defined(CONFIG_FW_ARC)
> -	struct screen_info *si = &screen_info;
> +	static struct screen_info si;
>   	DISPLAY_STATUS *di;
>   
>   	di = ArcGetDisplayStatus(1);
>   
>   	if (di) {
> -		si->orig_x		= di->CursorXPosition;
> -		si->orig_y		= di->CursorYPosition;
> -		si->orig_video_cols	= di->CursorMaxXPosition;
> -		si->orig_video_lines	= di->CursorMaxYPosition;
> -		si->orig_video_isVGA	= VIDEO_TYPE_VGAC;
> -		si->orig_video_points	= 16;
> +		si.orig_x		= di->CursorXPosition;
> +		si.orig_y		= di->CursorYPosition;
> +		si.orig_video_cols	= di->CursorMaxXPosition;
> +		si.orig_video_lines	= di->CursorMaxYPosition;
> +		si.orig_video_isVGA	= VIDEO_TYPE_VGAC;
> +		si.orig_video_points	= 16;
> +
> +		vgacon_register_screen(&si);
>   	}
>   #endif
>   }
> diff --git a/drivers/firmware/pcdp.c b/drivers/firmware/pcdp.c
> index 667a595373b2d..876b3e9b37e25 100644
> --- a/drivers/firmware/pcdp.c
> +++ b/drivers/firmware/pcdp.c
> @@ -72,7 +72,6 @@ setup_vga_console(struct pcdp_device *dev)
>   		return -ENODEV;
>   	}
>   
> -	vgacon_register_screen(&screen_info);
>   	printk(KERN_INFO "PCDP: VGA console\n");
>   	return 0;
>   #else

[PATCH v2 7/9] vga16fb: drop powerpc support

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

I noticed that commit 0db5b61e0dc07 ("fbdev/vga16fb: Create
EGA/VGA devices in sysfb code") broke vga16fb on non-x86 platforms,
because the sysfb code never creates a vga-framebuffer device when
screen_info.orig_video_isVGA is set to '1' instead of VIDEO_TYPE_VGAC.

However, it turns out that the only architecture that has allowed
building vga16fb in the past 20 years is powerpc, and this only worked
on two 32-bit platforms and never on 64-bit powerpc. The last machine
that actually used this was removed in linux-3.10, so this is all dead
code and can be removed.

The big-endian support in vga16fb.c could also be removed, but I'd just
leave this in place.

Fixes: 933ee7119fb14 ("powerpc: remove PReP platform")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/powerpc/kernel/setup-common.c | 16 ----------------
 drivers/video/fbdev/Kconfig        |  2 +-
 drivers/video/fbdev/vga16fb.c      |  9 +--------
 3 files changed, 2 insertions(+), 25 deletions(-)

diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index d2a446216444f..81a6313927228 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -22,7 +22,6 @@
 #include <linux/seq_file.h>
 #include <linux/ioport.h>
 #include <linux/console.h>
-#include <linux/screen_info.h>
 #include <linux/root_dev.h>
 #include <linux/cpu.h>
 #include <linux/unistd.h>
@@ -98,21 +97,6 @@ int boot_cpu_hwid = -1;
 int dcache_bsize;
 int icache_bsize;
 
-/*
- * This still seems to be needed... -- paulus
- */ 
-struct screen_info screen_info = {
-	.orig_x = 0,
-	.orig_y = 25,
-	.orig_video_cols = 80,
-	.orig_video_lines = 25,
-	.orig_video_isVGA = 1,
-	.orig_video_points = 16
-};
-#if defined(CONFIG_FB_VGA16_MODULE)
-EXPORT_SYMBOL(screen_info);
-#endif
-
 /* Variables required to store legacy IO irq routing */
 int of_i8042_kbd_irq;
 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
index 9169ee532baf7..ebc3cdfdfca07 100644
--- a/drivers/video/fbdev/Kconfig
+++ b/drivers/video/fbdev/Kconfig
@@ -368,7 +368,7 @@ config FB_IMSTT
 
 config FB_VGA16
 	tristate "VGA 16-color graphics support"
-	depends on FB && (X86 || PPC)
+	depends on FB && X86
 	select APERTURE_HELPERS
 	select FB_CFB_FILLRECT
 	select FB_CFB_COPYAREA
diff --git a/drivers/video/fbdev/vga16fb.c b/drivers/video/fbdev/vga16fb.c
index 34d00347ad58a..8e28f9dd19044 100644
--- a/drivers/video/fbdev/vga16fb.c
+++ b/drivers/video/fbdev/vga16fb.c
@@ -185,8 +185,6 @@ static inline void setindex(int index)
 /* Check if the video mode is supported by the driver */
 static inline int check_mode_supported(const struct screen_info *si)
 {
-	/* non-x86 architectures treat orig_video_isVGA as a boolean flag */
-#if defined(CONFIG_X86)
 	/* only EGA and VGA in 16 color graphic mode are supported */
 	if (si->orig_video_isVGA != VIDEO_TYPE_EGAC &&
 	    si->orig_video_isVGA != VIDEO_TYPE_VGAC)
@@ -197,7 +195,7 @@ static inline int check_mode_supported(const struct screen_info *si)
 	    si->orig_video_mode != 0x10 &&	/* 640x350/4 (EGA) */
 	    si->orig_video_mode != 0x12)	/* 640x480/4 (VGA) */
 		return -ENODEV;
-#endif
+
 	return 0;
 }
 
@@ -1338,12 +1336,7 @@ static int vga16fb_probe(struct platform_device *dev)
 	printk(KERN_INFO "vga16fb: mapped to 0x%p\n", info->screen_base);
 	par = info->par;
 
-#if defined(CONFIG_X86)
 	par->isVGA = si->orig_video_isVGA == VIDEO_TYPE_VGAC;
-#else
-	/* non-x86 architectures treat orig_video_isVGA as a boolean flag */
-	par->isVGA = si->orig_video_isVGA;
-#endif
 	par->palette_blanked = 0;
 	par->vesa_blanked = 0;
 
-- 
2.39.2

Re: [PATCH v2 7/9] vga16fb: drop powerpc support

[Javier Martinez Canillas]

Arnd Bergmann <arnd@kernel.org> writes:

> From: Arnd Bergmann <arnd@arndb.de>
>
> I noticed that commit 0db5b61e0dc07 ("fbdev/vga16fb: Create
> EGA/VGA devices in sysfb code") broke vga16fb on non-x86 platforms,
> because the sysfb code never creates a vga-framebuffer device when
> screen_info.orig_video_isVGA is set to '1' instead of VIDEO_TYPE_VGAC.
>
> However, it turns out that the only architecture that has allowed
> building vga16fb in the past 20 years is powerpc, and this only worked
> on two 32-bit platforms and never on 64-bit powerpc. The last machine
> that actually used this was removed in linux-3.10, so this is all dead
> code and can be removed.
>
> The big-endian support in vga16fb.c could also be removed, but I'd just
> leave this in place.
>
> Fixes: 933ee7119fb14 ("powerpc: remove PReP platform")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat

[PATCH v2 8/9] hyperv: avoid dependency on screen_info

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

The two hyperv framebuffer drivers (hyperv_fb or hyperv_drm_drv) access the
global screen_info in order to take over from the sysfb framebuffer, which
in turn could be handled by simplefb, simpledrm or efifb. Similarly, the
vmbus_drv code marks the original EFI framebuffer as reserved, but this
is not required if there is no sysfb.

As a preparation for making screen_info itself more local to the sysfb
helper code, add a compile-time conditional in all three files that relate
to hyperv fb and just skip this code if there is no sysfb that needs to
be unregistered.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/gpu/drm/hyperv/hyperv_drm_drv.c | 7 ++++---
 drivers/hv/vmbus_drv.c                  | 6 ++++--
 drivers/video/fbdev/hyperv_fb.c         | 8 ++++----
 3 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/hyperv/hyperv_drm_drv.c b/drivers/gpu/drm/hyperv/hyperv_drm_drv.c
index 8026118c6e033..9a44a00effc24 100644
--- a/drivers/gpu/drm/hyperv/hyperv_drm_drv.c
+++ b/drivers/gpu/drm/hyperv/hyperv_drm_drv.c
@@ -73,9 +73,10 @@ static int hyperv_setup_vram(struct hyperv_drm_device *hv,
 	struct drm_device *dev = &hv->dev;
 	int ret;
 
-	drm_aperture_remove_conflicting_framebuffers(screen_info.lfb_base,
-						     screen_info.lfb_size,
-						     &hyperv_driver);
+	if (IS_ENABLED(CONFIG_SYSFB))
+		drm_aperture_remove_conflicting_framebuffers(screen_info.lfb_base,
+							     screen_info.lfb_size,
+							     &hyperv_driver);
 
 	hv->fb_size = (unsigned long)hv->mmio_megabytes * 1024 * 1024;
 
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 67f95a29aeca5..5bc059e8a9f5f 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -2100,8 +2100,10 @@ static void __maybe_unused vmbus_reserve_fb(void)
 
 	if (efi_enabled(EFI_BOOT)) {
 		/* Gen2 VM: get FB base from EFI framebuffer */
-		start = screen_info.lfb_base;
-		size = max_t(__u32, screen_info.lfb_size, 0x800000);
+		if (IS_ENABLED(CONFIG_SYSFB)) {
+			start = screen_info.lfb_base;
+			size = max_t(__u32, screen_info.lfb_size, 0x800000);
+		}
 	} else {
 		/* Gen1 VM: get FB base from PCI */
 		pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,
diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c
index b331452aab4fb..7e0d1c4235549 100644
--- a/drivers/video/fbdev/hyperv_fb.c
+++ b/drivers/video/fbdev/hyperv_fb.c
@@ -1030,7 +1030,7 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
 			goto getmem_done;
 		}
 		pr_info("Unable to allocate enough contiguous physical memory on Gen 1 VM. Using MMIO instead.\n");
-	} else {
+	} else if (IS_ENABLED(CONFIG_SYSFB)) {
 		base = screen_info.lfb_base;
 		size = screen_info.lfb_size;
 	}
@@ -1076,13 +1076,13 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
 getmem_done:
 	aperture_remove_conflicting_devices(base, size, KBUILD_MODNAME);
 
-	if (gen2vm) {
+	if (!gen2vm) {
+		pci_dev_put(pdev);
+	} else if (IS_ENABLED(CONFIG_SYSFB)) {
 		/* framebuffer is reallocated, clear screen_info to avoid misuse from kexec */
 		screen_info.lfb_size = 0;
 		screen_info.lfb_base = 0;
 		screen_info.orig_video_isVGA = 0;
-	} else {
-		pci_dev_put(pdev);
 	}
 
 	return 0;
-- 
2.39.2

Re: [PATCH v2 8/9] hyperv: avoid dependency on screen_info

[Javier Martinez Canillas]

Arnd Bergmann <arnd@kernel.org> writes:

> From: Arnd Bergmann <arnd@arndb.de>
>
> The two hyperv framebuffer drivers (hyperv_fb or hyperv_drm_drv) access the
> global screen_info in order to take over from the sysfb framebuffer, which
> in turn could be handled by simplefb, simpledrm or efifb. Similarly, the
> vmbus_drv code marks the original EFI framebuffer as reserved, but this
> is not required if there is no sysfb.
>
> As a preparation for making screen_info itself more local to the sysfb
> helper code, add a compile-time conditional in all three files that relate
> to hyperv fb and just skip this code if there is no sysfb that needs to
> be unregistered.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat

[PATCH v2 9/9] efi: move screen_info into efi init code

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

After the vga console no longer relies on global screen_info, there are
only two remaining use cases:

 - on the x86 architecture, it is used for multiple boot methods
   (bzImage, EFI, Xen, kexec) to commicate the initial VGA or framebuffer
   settings to a number of device drivers.

 - on other architectures, it is only used as part of the EFI stub,
   and only for the three sysfb framebuffers (simpledrm, simplefb, efifb).

Remove the duplicate data structure definitions by moving it into the
efi-init.c file that sets it up initially for the EFI case, leaving x86
as an exception that retains its own definition for non-EFI boots.

The added #ifdefs here are optional, I added them to further limit the
reach of screen_info to configurations that have at least one of the
users enabled.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/arm/kernel/setup.c                       |  4 ----
 arch/arm64/kernel/efi.c                       |  4 ----
 arch/arm64/kernel/image-vars.h                |  2 ++
 arch/ia64/kernel/setup.c                      |  4 ----
 arch/loongarch/kernel/efi.c                   |  3 ++-
 arch/loongarch/kernel/image-vars.h            |  2 ++
 arch/loongarch/kernel/setup.c                 |  5 -----
 arch/riscv/kernel/image-vars.h                |  2 ++
 arch/riscv/kernel/setup.c                     |  5 -----
 drivers/firmware/efi/efi-init.c               | 14 +++++++++++++-
 drivers/firmware/efi/libstub/efi-stub-entry.c |  8 +++++++-
 11 files changed, 28 insertions(+), 25 deletions(-)

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 86c2751f56dcf..135b7eff03f72 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -939,10 +939,6 @@ static struct screen_info vgacon_screen_info = {
 };
 #endif
 
-#if defined(CONFIG_EFI)
-struct screen_info screen_info;
-#endif
-
 static int __init customize_machine(void)
 {
 	/*
diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
index 3afbe503b066f..ff2d5169d7f1f 100644
--- a/arch/arm64/kernel/efi.c
+++ b/arch/arm64/kernel/efi.c
@@ -71,10 +71,6 @@ static __init pteval_t create_mapping_protection(efi_memory_desc_t *md)
 	return pgprot_val(PAGE_KERNEL_EXEC);
 }
 
-/* we will fill this structure from the stub, so don't put it in .bss */
-struct screen_info screen_info __section(".data");
-EXPORT_SYMBOL(screen_info);
-
 int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
 {
 	pteval_t prot_val = create_mapping_protection(md);
diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
index 35f3c79595137..5e4dc72ab1bda 100644
--- a/arch/arm64/kernel/image-vars.h
+++ b/arch/arm64/kernel/image-vars.h
@@ -27,7 +27,9 @@ PROVIDE(__efistub__text			= _text);
 PROVIDE(__efistub__end			= _end);
 PROVIDE(__efistub___inittext_end       	= __inittext_end);
 PROVIDE(__efistub__edata		= _edata);
+#if defined(CONFIG_EFI_EARLYCON) || defined(CONFIG_SYSFB)
 PROVIDE(__efistub_screen_info		= screen_info);
+#endif
 PROVIDE(__efistub__ctype		= _ctype);
 
 PROVIDE(__pi___memcpy			= __pi_memcpy);
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index 82feae1323f40..e91a91b5e9142 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -86,10 +86,6 @@ EXPORT_SYMBOL(local_per_cpu_offset);
 #endif
 unsigned long ia64_cycles_per_usec;
 struct ia64_boot_param *ia64_boot_param;
-#if defined(CONFIG_EFI)
-/* No longer used on ia64, but needed for linking */
-struct screen_info screen_info;
-#endif
 #ifdef CONFIG_VGA_CONSOLE
 unsigned long vga_console_iobase;
 unsigned long vga_console_membase;
diff --git a/arch/loongarch/kernel/efi.c b/arch/loongarch/kernel/efi.c
index 9fc10cea21e10..df7db34024e61 100644
--- a/arch/loongarch/kernel/efi.c
+++ b/arch/loongarch/kernel/efi.c
@@ -115,7 +115,8 @@ void __init efi_init(void)
 
 	set_bit(EFI_CONFIG_TABLES, &efi.flags);
 
-	init_screen_info();
+	if (IS_ENABLED(CONFIG_EFI_EARLYCON) || IS_ENABLED(CONFIG_SYSFB))
+		init_screen_info();
 
 	if (boot_memmap == EFI_INVALID_TABLE_ADDR)
 		return;
diff --git a/arch/loongarch/kernel/image-vars.h b/arch/loongarch/kernel/image-vars.h
index e561989d02de9..5087416b9678d 100644
--- a/arch/loongarch/kernel/image-vars.h
+++ b/arch/loongarch/kernel/image-vars.h
@@ -12,7 +12,9 @@ __efistub_kernel_entry		= kernel_entry;
 __efistub_kernel_asize		= kernel_asize;
 __efistub_kernel_fsize		= kernel_fsize;
 __efistub_kernel_offset		= kernel_offset;
+#if defined(CONFIG_EFI_EARLYCON) || defined(CONFIG_SYSFB)
 __efistub_screen_info		= screen_info;
+#endif
 
 #endif
 
diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c
index 77e7a3722caa6..4570c3149b849 100644
--- a/arch/loongarch/kernel/setup.c
+++ b/arch/loongarch/kernel/setup.c
@@ -16,7 +16,6 @@
 #include <linux/dmi.h>
 #include <linux/efi.h>
 #include <linux/export.h>
-#include <linux/screen_info.h>
 #include <linux/memblock.h>
 #include <linux/initrd.h>
 #include <linux/ioport.h>
@@ -57,10 +56,6 @@
 #define SMBIOS_CORE_PACKAGE_OFFSET	0x23
 #define LOONGSON_EFI_ENABLE		(1 << 3)
 
-#ifdef CONFIG_EFI
-struct screen_info screen_info __section(".data");
-#endif
-
 unsigned long fw_arg0, fw_arg1, fw_arg2;
 DEFINE_PER_CPU(unsigned long, kernelsp);
 struct cpuinfo_loongarch cpu_data[NR_CPUS] __read_mostly;
diff --git a/arch/riscv/kernel/image-vars.h b/arch/riscv/kernel/image-vars.h
index 15616155008cc..89d92f9644d5e 100644
--- a/arch/riscv/kernel/image-vars.h
+++ b/arch/riscv/kernel/image-vars.h
@@ -27,7 +27,9 @@ __efistub__start		= _start;
 __efistub__start_kernel		= _start_kernel;
 __efistub__end			= _end;
 __efistub__edata		= _edata;
+#if defined(CONFIG_EFI_EARLYCON) || defined(CONFIG_SYSFB)
 __efistub_screen_info		= screen_info;
+#endif
 
 #endif
 
diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index a3dbe13f45fb3..aea585dc8e8f3 100644
--- a/arch/riscv/kernel/setup.c
+++ b/arch/riscv/kernel/setup.c
@@ -15,7 +15,6 @@
 #include <linux/memblock.h>
 #include <linux/sched.h>
 #include <linux/console.h>
-#include <linux/screen_info.h>
 #include <linux/of_fdt.h>
 #include <linux/sched/task.h>
 #include <linux/smp.h>
@@ -39,10 +38,6 @@
 
 #include "head.h"
 
-#if defined(CONFIG_EFI)
-struct screen_info screen_info __section(".data");
-#endif
-
 /*
  * The lucky hart to first increment this variable will boot the other cores.
  * This is used before the kernel initializes the BSS so it can't be in the
diff --git a/drivers/firmware/efi/efi-init.c b/drivers/firmware/efi/efi-init.c
index ef0820f1a9246..d4987d0130801 100644
--- a/drivers/firmware/efi/efi-init.c
+++ b/drivers/firmware/efi/efi-init.c
@@ -55,6 +55,15 @@ static phys_addr_t __init efi_to_phys(unsigned long addr)
 
 extern __weak const efi_config_table_type_t efi_arch_tables[];
 
+/*
+ * x86 defines its own screen_info and uses it even without EFI,
+ * everything else can get it from here.
+ */
+#if !defined(CONFIG_X86) && (defined(CONFIG_SYSFB) || defined(CONFIG_EFI_EARLYCON))
+struct screen_info screen_info __section(".data");
+EXPORT_SYMBOL_GPL(screen_info);
+#endif
+
 static void __init init_screen_info(void)
 {
 	struct screen_info *si;
@@ -240,5 +249,8 @@ void __init efi_init(void)
 	memblock_reserve(data.phys_map & PAGE_MASK,
 			 PAGE_ALIGN(data.size + (data.phys_map & ~PAGE_MASK)));
 
-	init_screen_info();
+	if (IS_ENABLED(CONFIG_X86) ||
+	    IS_ENABLED(CONFIG_SYSFB) ||
+	    IS_ENABLED(CONFIG_EFI_EARLYCON))
+		init_screen_info();
 }
diff --git a/drivers/firmware/efi/libstub/efi-stub-entry.c b/drivers/firmware/efi/libstub/efi-stub-entry.c
index 2f1902e5d4075..a6c0498351905 100644
--- a/drivers/firmware/efi/libstub/efi-stub-entry.c
+++ b/drivers/firmware/efi/libstub/efi-stub-entry.c
@@ -13,7 +13,13 @@ struct screen_info *alloc_screen_info(void)
 {
 	if (IS_ENABLED(CONFIG_ARM))
 		return __alloc_screen_info();
-	return (void *)&screen_info + screen_info_offset;
+
+	if (IS_ENABLED(CONFIG_X86) ||
+	    IS_ENABLED(CONFIG_EFI_EARLYCON) ||
+	    IS_ENABLED(CONFIG_SYSFB))
+		return (void *)&screen_info + screen_info_offset;
+
+	return NULL;
 }
 
 /*
-- 
2.39.2

Re: [PATCH v2 9/9] efi: move screen_info into efi init code

[Ard Biesheuvel]

On Wed, 19 Jul 2023 at 14:41, Arnd Bergmann <arnd@kernel.org> wrote:
>
> From: Arnd Bergmann <arnd@arndb.de>
>
> After the vga console no longer relies on global screen_info, there are
> only two remaining use cases:
>
>  - on the x86 architecture, it is used for multiple boot methods
>    (bzImage, EFI, Xen, kexec) to commicate the initial VGA or framebuffer
>    settings to a number of device drivers.
>
>  - on other architectures, it is only used as part of the EFI stub,
>    and only for the three sysfb framebuffers (simpledrm, simplefb, efifb).
>
> Remove the duplicate data structure definitions by moving it into the
> efi-init.c file that sets it up initially for the EFI case, leaving x86
> as an exception that retains its own definition for non-EFI boots.
>
> The added #ifdefs here are optional, I added them to further limit the
> reach of screen_info to configurations that have at least one of the
> users enabled.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>

> ---
>  arch/arm/kernel/setup.c                       |  4 ----
>  arch/arm64/kernel/efi.c                       |  4 ----
>  arch/arm64/kernel/image-vars.h                |  2 ++
>  arch/ia64/kernel/setup.c                      |  4 ----
>  arch/loongarch/kernel/efi.c                   |  3 ++-
>  arch/loongarch/kernel/image-vars.h            |  2 ++
>  arch/loongarch/kernel/setup.c                 |  5 -----
>  arch/riscv/kernel/image-vars.h                |  2 ++
>  arch/riscv/kernel/setup.c                     |  5 -----
>  drivers/firmware/efi/efi-init.c               | 14 +++++++++++++-
>  drivers/firmware/efi/libstub/efi-stub-entry.c |  8 +++++++-
>  11 files changed, 28 insertions(+), 25 deletions(-)
>
> diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
> index 86c2751f56dcf..135b7eff03f72 100644
> --- a/arch/arm/kernel/setup.c
> +++ b/arch/arm/kernel/setup.c
> @@ -939,10 +939,6 @@ static struct screen_info vgacon_screen_info = {
>  };
>  #endif
>
> -#if defined(CONFIG_EFI)
> -struct screen_info screen_info;
> -#endif
> -
>  static int __init customize_machine(void)
>  {
>         /*
> diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
> index 3afbe503b066f..ff2d5169d7f1f 100644
> --- a/arch/arm64/kernel/efi.c
> +++ b/arch/arm64/kernel/efi.c
> @@ -71,10 +71,6 @@ static __init pteval_t create_mapping_protection(efi_memory_desc_t *md)
>         return pgprot_val(PAGE_KERNEL_EXEC);
>  }
>
> -/* we will fill this structure from the stub, so don't put it in .bss */
> -struct screen_info screen_info __section(".data");
> -EXPORT_SYMBOL(screen_info);
> -
>  int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
>  {
>         pteval_t prot_val = create_mapping_protection(md);
> diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
> index 35f3c79595137..5e4dc72ab1bda 100644
> --- a/arch/arm64/kernel/image-vars.h
> +++ b/arch/arm64/kernel/image-vars.h
> @@ -27,7 +27,9 @@ PROVIDE(__efistub__text                       = _text);
>  PROVIDE(__efistub__end                 = _end);
>  PROVIDE(__efistub___inittext_end               = __inittext_end);
>  PROVIDE(__efistub__edata               = _edata);
> +#if defined(CONFIG_EFI_EARLYCON) || defined(CONFIG_SYSFB)
>  PROVIDE(__efistub_screen_info          = screen_info);
> +#endif
>  PROVIDE(__efistub__ctype               = _ctype);
>
>  PROVIDE(__pi___memcpy                  = __pi_memcpy);
> diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
> index 82feae1323f40..e91a91b5e9142 100644
> --- a/arch/ia64/kernel/setup.c
> +++ b/arch/ia64/kernel/setup.c
> @@ -86,10 +86,6 @@ EXPORT_SYMBOL(local_per_cpu_offset);
>  #endif
>  unsigned long ia64_cycles_per_usec;
>  struct ia64_boot_param *ia64_boot_param;
> -#if defined(CONFIG_EFI)
> -/* No longer used on ia64, but needed for linking */
> -struct screen_info screen_info;
> -#endif
>  #ifdef CONFIG_VGA_CONSOLE
>  unsigned long vga_console_iobase;
>  unsigned long vga_console_membase;
> diff --git a/arch/loongarch/kernel/efi.c b/arch/loongarch/kernel/efi.c
> index 9fc10cea21e10..df7db34024e61 100644
> --- a/arch/loongarch/kernel/efi.c
> +++ b/arch/loongarch/kernel/efi.c
> @@ -115,7 +115,8 @@ void __init efi_init(void)
>
>         set_bit(EFI_CONFIG_TABLES, &efi.flags);
>
> -       init_screen_info();
> +       if (IS_ENABLED(CONFIG_EFI_EARLYCON) || IS_ENABLED(CONFIG_SYSFB))
> +               init_screen_info();
>
>         if (boot_memmap == EFI_INVALID_TABLE_ADDR)
>                 return;
> diff --git a/arch/loongarch/kernel/image-vars.h b/arch/loongarch/kernel/image-vars.h
> index e561989d02de9..5087416b9678d 100644
> --- a/arch/loongarch/kernel/image-vars.h
> +++ b/arch/loongarch/kernel/image-vars.h
> @@ -12,7 +12,9 @@ __efistub_kernel_entry                = kernel_entry;
>  __efistub_kernel_asize         = kernel_asize;
>  __efistub_kernel_fsize         = kernel_fsize;
>  __efistub_kernel_offset                = kernel_offset;
> +#if defined(CONFIG_EFI_EARLYCON) || defined(CONFIG_SYSFB)
>  __efistub_screen_info          = screen_info;
> +#endif
>
>  #endif
>
> diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c
> index 77e7a3722caa6..4570c3149b849 100644
> --- a/arch/loongarch/kernel/setup.c
> +++ b/arch/loongarch/kernel/setup.c
> @@ -16,7 +16,6 @@
>  #include <linux/dmi.h>
>  #include <linux/efi.h>
>  #include <linux/export.h>
> -#include <linux/screen_info.h>
>  #include <linux/memblock.h>
>  #include <linux/initrd.h>
>  #include <linux/ioport.h>
> @@ -57,10 +56,6 @@
>  #define SMBIOS_CORE_PACKAGE_OFFSET     0x23
>  #define LOONGSON_EFI_ENABLE            (1 << 3)
>
> -#ifdef CONFIG_EFI
> -struct screen_info screen_info __section(".data");
> -#endif
> -
>  unsigned long fw_arg0, fw_arg1, fw_arg2;
>  DEFINE_PER_CPU(unsigned long, kernelsp);
>  struct cpuinfo_loongarch cpu_data[NR_CPUS] __read_mostly;
> diff --git a/arch/riscv/kernel/image-vars.h b/arch/riscv/kernel/image-vars.h
> index 15616155008cc..89d92f9644d5e 100644
> --- a/arch/riscv/kernel/image-vars.h
> +++ b/arch/riscv/kernel/image-vars.h
> @@ -27,7 +27,9 @@ __efistub__start              = _start;
>  __efistub__start_kernel                = _start_kernel;
>  __efistub__end                 = _end;
>  __efistub__edata               = _edata;
> +#if defined(CONFIG_EFI_EARLYCON) || defined(CONFIG_SYSFB)
>  __efistub_screen_info          = screen_info;
> +#endif
>
>  #endif
>
> diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> index a3dbe13f45fb3..aea585dc8e8f3 100644
> --- a/arch/riscv/kernel/setup.c
> +++ b/arch/riscv/kernel/setup.c
> @@ -15,7 +15,6 @@
>  #include <linux/memblock.h>
>  #include <linux/sched.h>
>  #include <linux/console.h>
> -#include <linux/screen_info.h>
>  #include <linux/of_fdt.h>
>  #include <linux/sched/task.h>
>  #include <linux/smp.h>
> @@ -39,10 +38,6 @@
>
>  #include "head.h"
>
> -#if defined(CONFIG_EFI)
> -struct screen_info screen_info __section(".data");
> -#endif
> -
>  /*
>   * The lucky hart to first increment this variable will boot the other cores.
>   * This is used before the kernel initializes the BSS so it can't be in the
> diff --git a/drivers/firmware/efi/efi-init.c b/drivers/firmware/efi/efi-init.c
> index ef0820f1a9246..d4987d0130801 100644
> --- a/drivers/firmware/efi/efi-init.c
> +++ b/drivers/firmware/efi/efi-init.c
> @@ -55,6 +55,15 @@ static phys_addr_t __init efi_to_phys(unsigned long addr)
>
>  extern __weak const efi_config_table_type_t efi_arch_tables[];
>
> +/*
> + * x86 defines its own screen_info and uses it even without EFI,
> + * everything else can get it from here.
> + */
> +#if !defined(CONFIG_X86) && (defined(CONFIG_SYSFB) || defined(CONFIG_EFI_EARLYCON))
> +struct screen_info screen_info __section(".data");
> +EXPORT_SYMBOL_GPL(screen_info);
> +#endif
> +
>  static void __init init_screen_info(void)
>  {
>         struct screen_info *si;
> @@ -240,5 +249,8 @@ void __init efi_init(void)
>         memblock_reserve(data.phys_map & PAGE_MASK,
>                          PAGE_ALIGN(data.size + (data.phys_map & ~PAGE_MASK)));
>
> -       init_screen_info();
> +       if (IS_ENABLED(CONFIG_X86) ||
> +           IS_ENABLED(CONFIG_SYSFB) ||
> +           IS_ENABLED(CONFIG_EFI_EARLYCON))
> +               init_screen_info();
>  }
> diff --git a/drivers/firmware/efi/libstub/efi-stub-entry.c b/drivers/firmware/efi/libstub/efi-stub-entry.c
> index 2f1902e5d4075..a6c0498351905 100644
> --- a/drivers/firmware/efi/libstub/efi-stub-entry.c
> +++ b/drivers/firmware/efi/libstub/efi-stub-entry.c
> @@ -13,7 +13,13 @@ struct screen_info *alloc_screen_info(void)
>  {
>         if (IS_ENABLED(CONFIG_ARM))
>                 return __alloc_screen_info();
> -       return (void *)&screen_info + screen_info_offset;
> +
> +       if (IS_ENABLED(CONFIG_X86) ||
> +           IS_ENABLED(CONFIG_EFI_EARLYCON) ||
> +           IS_ENABLED(CONFIG_SYSFB))
> +               return (void *)&screen_info + screen_info_offset;
> +
> +       return NULL;
>  }
>
>  /*
> --
> 2.39.2
>

Re: [PATCH v2 9/9] efi: move screen_info into efi init code

[Javier Martinez Canillas]

Arnd Bergmann <arnd@kernel.org> writes:

> From: Arnd Bergmann <arnd@arndb.de>
>
> After the vga console no longer relies on global screen_info, there are
> only two remaining use cases:
>
>  - on the x86 architecture, it is used for multiple boot methods
>    (bzImage, EFI, Xen, kexec) to commicate the initial VGA or framebuffer

communicate

>    settings to a number of device drivers.
>
>  - on other architectures, it is only used as part of the EFI stub,
>    and only for the three sysfb framebuffers (simpledrm, simplefb, efifb).
>
> Remove the duplicate data structure definitions by moving it into the
> efi-init.c file that sets it up initially for the EFI case, leaving x86
> as an exception that retains its own definition for non-EFI boots.
>
> The added #ifdefs here are optional, I added them to further limit the
> reach of screen_info to configurations that have at least one of the
> users enabled.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat

Re: [PATCH v2 0/9] video: screen_info cleanups

[Helge Deller]

On 7/19/23 14:39, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> I refreshed the first four patches that I sent before with very minor
> updates, and then added some more to further disaggregate the use
> of screen_info:
>
>   - I found that powerpc wasn't using vga16fb any more
>
>   - vgacon can be almost entirely separated from the global
>     screen_info, except on x86
>
>   - similarly, the EFI framebuffer initialization can be
>     kept separate, except on x86.

Nice cleanup, Arnd!

You may add a
Acked-by: Helge Deller <deller@gmx.de>
to the series.


> I did extensive build testing on arm/arm64/x86 and the normal built bot
> testing for the other architectures.

> Which tree should this get merged through?

I suggest drm-misc or fbdev. Either is fine for me.

Since it applies cleanly onto git head, I can put it a few days into
the fbdev git tree to see if some builds break. Just let me know.

Helge