LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Mike Rapoport <rppt@linux.ibm.com>
To: Florian Fainelli <f.fainelli@gmail.com>
Cc: linux-kernel@vger.kernel.org,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Rob Herring <robh+dt@kernel.org>,
	Frank Rowand <frowand.list@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Marc Zyngier <marc.zyngier@arm.com>,
	Russell King <rmk+kernel@armlinux.org.uk>,
	Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Andrey Konovalov <andreyknvl@google.com>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Laura Abbott <labbott@redhat.com>, Stefan Agner <stefan@agner.ch>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Greg Hackmann <ghackmann@android.com>,
	Kristina Martsenko <kristina.martsenko@arm.com>,
	CHANDAN VN <chandan.vn@samsung.com>,
	"moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)" 
	<linux-arm-kernel@lists.infradead.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE" 
	<devicetree@vger.kernel.org>,
	linux@armlinux.org.uk, green.hu@gmail.com, deanbo422@gmail.com,
	gxt@pku.edu.cn, ard.biesheuvel@linaro.org,
	linux-snps-arc@lists.infradead.org, vgupta@synopsys.com
Subject: Re: [PATCH v2 4/6] arm64: Utilize phys_initrd_start/phys_initrd_size
Date: Wed, 31 Oct 2018 09:03:50 +0200	[thread overview]
Message-ID: <20181031070350.GA12503@rapoport-lnx> (raw)
In-Reply-To: <20181030230721.28429-5-f.fainelli@gmail.com>

On Tue, Oct 30, 2018 at 04:07:19PM -0700, Florian Fainelli wrote:
> ARM64 is the only architecture that re-defines
> __early_init_dt_declare_initrd() in order for that function to populate
> initrd_start/initrd_end with physical addresses instead of virtual
> addresses. Instead of having an override we can leverage
> drivers/of/fdt.c populating phys_initrd_start/phys_initrd_size to
> populate those variables for us.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
> ---
>  arch/arm64/mm/init.c | 21 +++++++++------------
>  1 file changed, 9 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index 3cf87341859f..e95cee656a55 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -72,8 +72,8 @@ static int __init early_initrd(char *p)
>  	if (*endp == ',') {
>  		size = memparse(endp + 1, NULL);
>  
> -		initrd_start = start;
> -		initrd_end = start + size;
> +		phys_initrd_start = start;
> +		phys_initrd_size = size;
>  	}
>  	return 0;
>  }
> @@ -408,14 +408,14 @@ void __init arm64_memblock_init(void)
>  		memblock_add(__pa_symbol(_text), (u64)(_end - _text));
>  	}
>  
> -	if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && initrd_start) {
> +	if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && phys_initrd_size) {
>  		/*
>  		 * Add back the memory we just removed if it results in the
>  		 * initrd to become inaccessible via the linear mapping.
>  		 * Otherwise, this is a no-op
>  		 */
> -		u64 base = initrd_start & PAGE_MASK;
> -		u64 size = PAGE_ALIGN(initrd_end) - base;
> +		u64 base = phys_initrd_start & PAGE_MASK;
> +		u64 size = PAGE_ALIGN(phys_initrd_size);
>  
>  		/*
>  		 * We can only add back the initrd memory if we don't end up
> @@ -460,13 +460,10 @@ void __init arm64_memblock_init(void)
>  	 */
>  	memblock_reserve(__pa_symbol(_text), _end - _text);
>  #ifdef CONFIG_BLK_DEV_INITRD
> -	if (initrd_start) {

There may be no initrd at all, so the condition here would rather become

	if (phys_initrd_start)

> -		memblock_reserve(initrd_start, initrd_end - initrd_start);
> -
> -		/* the generic initrd code expects virtual addresses */
> -		initrd_start = __phys_to_virt(initrd_start);
> -		initrd_end = __phys_to_virt(initrd_end);
> -	}
> +	/* the generic initrd code expects virtual addresses */
> +	initrd_start = __phys_to_virt(phys_initrd_start);
> +	initrd_end = initrd_start + phys_initrd_size;
> +	initrd_below_start_ok = 0;
>  #endif

I also wonder what is the reason to keep memstart_addr randomization and
initrd setup interleaved?

What we have now is roughly:

1) set memstart_addr
2) enforce memory_limit
3) reserve initrd
4) randomize memstart_addr
5) reserve text + data
6) reserve initrd again and set virtual addresses of initrd_{start,end}

Maybe it's possible to merge (3) into (6) ?

>  	early_init_fdt_scan_reserved_mem();
> -- 
> 2.17.1
> 

-- 
Sincerely yours,
Mike.


  reply	other threads:[~2018-10-31  7:04 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-30 23:07 [PATCH v2 0/6] arm64: Get rid of __early_init_dt_declare_initrd() Florian Fainelli
2018-10-30 23:07 ` [PATCH v2 1/6] nds32: Remove phys_initrd_start and phys_initrd_size Florian Fainelli
2018-10-30 23:07 ` [PATCH v2 2/6] arch: Make phys_initrd_start and phys_initrd_size global variables Florian Fainelli
2018-10-30 23:07 ` [PATCH v2 3/6] of/fdt: Populate phys_initrd_start/phys_initrd_size from FDT Florian Fainelli
2018-10-30 23:07 ` [PATCH v2 4/6] arm64: Utilize phys_initrd_start/phys_initrd_size Florian Fainelli
2018-10-31  7:03   ` Mike Rapoport [this message]
2018-10-31 17:33     ` Florian Fainelli
2018-10-30 23:07 ` [PATCH v2 5/6] of/fdt: Remove custom __early_init_dt_declare_initrd() implementation Florian Fainelli
2018-10-31 12:29   ` Rob Herring
2018-10-30 23:07 ` [PATCH v2 6/6] arch: Move initrd= parsing into do_mounts_initrd.c Florian Fainelli

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20181031070350.GA12503@rapoport-lnx \
    --to=rppt@linux.ibm.com \
    --cc=akpm@linux-foundation.org \
    --cc=andreyknvl@google.com \
    --cc=ard.biesheuvel@linaro.org \
    --cc=aryabinin@virtuozzo.com \
    --cc=catalin.marinas@arm.com \
    --cc=chandan.vn@samsung.com \
    --cc=deanbo422@gmail.com \
    --cc=devicetree@vger.kernel.org \
    --cc=f.fainelli@gmail.com \
    --cc=frowand.list@gmail.com \
    --cc=ghackmann@android.com \
    --cc=green.hu@gmail.com \
    --cc=gxt@pku.edu.cn \
    --cc=hannes@cmpxchg.org \
    --cc=kristina.martsenko@arm.com \
    --cc=labbott@redhat.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-snps-arc@lists.infradead.org \
    --cc=linux@armlinux.org.uk \
    --cc=marc.zyngier@arm.com \
    --cc=rmk+kernel@armlinux.org.uk \
    --cc=robh+dt@kernel.org \
    --cc=robin.murphy@arm.com \
    --cc=stefan@agner.ch \
    --cc=vgupta@synopsys.com \
    --cc=will.deacon@arm.com \
    --cc=yamada.masahiro@socionext.com \
    --subject='Re: [PATCH v2 4/6] arm64: Utilize phys_initrd_start/phys_initrd_size' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).