From b8466fe82b79215b9ae28623a87c9a937ebd4f80 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Tue, 17 Oct 2023 11:39:46 +0200 Subject: [PATCH] efi: move screen_info into efi init code 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 commucate 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. Reviewed-by: Ard Biesheuvel Reviewed-by: Javier Martinez Canillas Acked-by: Helge Deller Signed-off-by: Arnd Bergmann Link: https://lore.kernel.org/r/20231017093947.3627976-1-arnd@kernel.org Signed-off-by: Greg Kroah-Hartman --- arch/arm64/kernel/efi.c | 4 ---- arch/arm64/kernel/image-vars.h | 2 ++ arch/loongarch/kernel/efi.c | 8 +++++++- 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 +++++++- 9 files changed, 33 insertions(+), 17 deletions(-) diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c index 2b478ca356b00..52089f111c8db 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/loongarch/kernel/efi.c b/arch/loongarch/kernel/efi.c index 9fc10cea21e10..acb5d3385675c 100644 --- a/arch/loongarch/kernel/efi.c +++ b/arch/loongarch/kernel/efi.c @@ -68,6 +68,11 @@ void __init efi_runtime_init(void) unsigned long __initdata screen_info_table = EFI_INVALID_TABLE_ADDR; +#if 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; @@ -115,7 +120,8 @@ 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 4ae0ad43c354e..2bf1f6977d525 100644 --- a/arch/loongarch/kernel/setup.c +++ b/arch/loongarch/kernel/setup.c @@ -16,7 +16,6 @@ #include #include #include -#include #include #include #include @@ -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 ea1a10355ce90..3df30dd1c458b 100644 --- a/arch/riscv/kernel/image-vars.h +++ b/arch/riscv/kernel/image-vars.h @@ -28,7 +28,9 @@ __efistub__start_kernel = _start_kernel; __efistub__end = _end; __efistub__edata = _edata; __efistub___init_text_end = __init_text_end; +#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 0c466a50f1744..0624f44d43eca 100644 --- a/arch/riscv/kernel/setup.c +++ b/arch/riscv/kernel/setup.c @@ -15,7 +15,6 @@ #include #include #include -#include #include #include #include @@ -40,10 +39,6 @@ #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; } /* -- 2.30.2