linux-kernel - Re: [PATCH v3 1/6] efi: Make efi_find

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Date:   Fri, 10 Jun 2022 17:22:28 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Wupeng Ma <mawupeng1@...wei.com>, <corbet@....net>,
        <will@...nel.org>, <ardb@...nel.org>, <catalin.marinas@....com>
CC:     <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
        <dave.hansen@...ux.intel.com>, <x86@...nel.org>, <hpa@...or.com>,
        <dvhart@...radead.org>, <andy@...radead.org>, <rppt@...nel.org>,
        <akpm@...ux-foundation.org>, <paul.walmsley@...ive.com>,
        <palmer@...belt.com>, <aou@...s.berkeley.edu>,
        <paulmck@...nel.org>, <keescook@...omium.org>,
        <songmuchun@...edance.com>, <rdunlap@...radead.org>,
        <damien.lemoal@...nsource.wdc.com>, <swboyd@...omium.org>,
        <wei.liu@...nel.org>, <robin.murphy@....com>, <david@...hat.com>,
        <anshuman.khandual@....com>, <thunder.leizhen@...wei.com>,
        <gpiccoli@...lia.com>, <chenhuacai@...nel.org>,
        <geert@...ux-m68k.org>, <chenzhou10@...wei.com>,
        <vijayb@...ux.microsoft.com>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-efi@...r.kernel.org>, <platform-driver-x86@...r.kernel.org>,
        <linux-mm@...ck.org>, <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH v3 1/6] efi: Make efi_find_mirror() public


On 2022/6/7 17:38, Wupeng Ma wrote:
> From: Ma Wupeng <mawupeng1@...wei.com>
>
> Commit b05b9f5f9dcf ("x86, mirror: x86 enabling - find mirrored memory
> ranges") introduce the efi_find_mirror function on x86. In order to reuse
> the API we make it public in preparation for arm64 to support mirrord
> memory.
Reviewed-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> Signed-off-by: Ma Wupeng <mawupeng1@...wei.com>
> ---
>   arch/x86/include/asm/efi.h  |  4 ----
>   arch/x86/platform/efi/efi.c | 23 -----------------------
>   drivers/firmware/efi/efi.c  | 23 +++++++++++++++++++++++
>   include/linux/efi.h         |  3 +++
>   4 files changed, 26 insertions(+), 27 deletions(-)
>
> diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
> index 71943dce691e..eb90206eae80 100644
> --- a/arch/x86/include/asm/efi.h
> +++ b/arch/x86/include/asm/efi.h
> @@ -383,7 +383,6 @@ static inline bool efi_is_64bit(void)
>   extern bool efi_reboot_required(void);
>   extern bool efi_is_table_address(unsigned long phys_addr);
>   
> -extern void efi_find_mirror(void);
>   extern void efi_reserve_boot_services(void);
>   #else
>   static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
> @@ -395,9 +394,6 @@ static inline  bool efi_is_table_address(unsigned long phys_addr)
>   {
>   	return false;
>   }
> -static inline void efi_find_mirror(void)
> -{
> -}
>   static inline void efi_reserve_boot_services(void)
>   {
>   }
> diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
> index 1591d67e0bcd..6e598bd78eef 100644
> --- a/arch/x86/platform/efi/efi.c
> +++ b/arch/x86/platform/efi/efi.c
> @@ -108,29 +108,6 @@ static int __init setup_add_efi_memmap(char *arg)
>   }
>   early_param("add_efi_memmap", setup_add_efi_memmap);
>   
> -void __init efi_find_mirror(void)
> -{
> -	efi_memory_desc_t *md;
> -	u64 mirror_size = 0, total_size = 0;
> -
> -	if (!efi_enabled(EFI_MEMMAP))
> -		return;
> -
> -	for_each_efi_memory_desc(md) {
> -		unsigned long long start = md->phys_addr;
> -		unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
> -
> -		total_size += size;
> -		if (md->attribute & EFI_MEMORY_MORE_RELIABLE) {
> -			memblock_mark_mirror(start, size);
> -			mirror_size += size;
> -		}
> -	}
> -	if (mirror_size)
> -		pr_info("Memory: %lldM/%lldM mirrored memory\n",
> -			mirror_size>>20, total_size>>20);
> -}
> -
>   /*
>    * Tell the kernel about the EFI memory map.  This might include
>    * more than the max 128 entries that can fit in the passed in e820
> diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
> index 860534bcfdac..79c232e07de7 100644
> --- a/drivers/firmware/efi/efi.c
> +++ b/drivers/firmware/efi/efi.c
> @@ -446,6 +446,29 @@ static int __init efisubsys_init(void)
>   
>   subsys_initcall(efisubsys_init);
>   
> +void __init efi_find_mirror(void)
> +{
> +	efi_memory_desc_t *md;
> +	u64 mirror_size = 0, total_size = 0;
> +
> +	if (!efi_enabled(EFI_MEMMAP))
> +		return;
> +
> +	for_each_efi_memory_desc(md) {
> +		unsigned long long start = md->phys_addr;
> +		unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
> +
> +		total_size += size;
> +		if (md->attribute & EFI_MEMORY_MORE_RELIABLE) {
> +			memblock_mark_mirror(start, size);
> +			mirror_size += size;
> +		}
> +	}
> +	if (mirror_size)
> +		pr_info("Memory: %lldM/%lldM mirrored memory\n",
> +			mirror_size>>20, total_size>>20);
> +}
> +
>   /*
>    * Find the efi memory descriptor for a given physical address.  Given a
>    * physical address, determine if it exists within an EFI Memory Map entry,
> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index 7d9b0bb47eb3..53f64c14a525 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -872,6 +872,7 @@ static inline bool efi_rt_services_supported(unsigned int mask)
>   {
>   	return (efi.runtime_supported_mask & mask) == mask;
>   }
> +extern void efi_find_mirror(void);
>   #else
>   static inline bool efi_enabled(int feature)
>   {
> @@ -889,6 +890,8 @@ static inline bool efi_rt_services_supported(unsigned int mask)
>   {
>   	return false;
>   }
> +
> +static inline void efi_find_mirror(void) {}
>   #endif
>   
>   extern int efi_status_to_err(efi_status_t status);