| Message ID | 20230719123944.3438363-10-arnd@kernel.org |
|---|---|
| State | New |
| Headers | show |
| Series | video: screen_info cleanups | expand |
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 >
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>
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; } /*