From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: "Linux Samsung SOC" <linux-samsung-soc@vger.kernel.org>,
"Nicolas Pitre" <nico@fluxnic.net>,
"Linus Walleij" <linus.walleij@linaro.org>,
"Krzysztof Kozlowski" <krzk@kernel.org>,
"Rob Herring" <robh+dt@kernel.org>,
"Cédric Le Goater" <clg@kaod.org>,
"Florian Fainelli" <f.fainelli@gmail.com>,
"Joel Stanley" <joel@jms.id.au>,
"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
"Marek Szyprowski" <m.szyprowski@samsung.com>
Subject: Re: [PATCH v2 2/2] ARM: move device tree mapping out of linear region
Date: Wed, 28 Oct 2020 13:09:39 +0000 [thread overview]
Message-ID: <20201028130939.GM1551@shell.armlinux.org.uk> (raw)
In-Reply-To: <CAMj1kXFWAr+-fnThgtY_jTg1_=kmhHRS5+X6jXAG9K7GegCchg@mail.gmail.com>
On Wed, Oct 28, 2020 at 02:04:41PM +0100, Ard Biesheuvel wrote:
> On Wed, 28 Oct 2020 at 14:01, Russell King - ARM Linux admin
> <linux@armlinux.org.uk> wrote:
> >
> > On Wed, Oct 28, 2020 at 01:52:48PM +0100, Ard Biesheuvel wrote:
> > > Does this help?
> > >
> > > diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
> > > index bb79e52aeb90..4f355bda872a 100644
> > > --- a/arch/arm/include/asm/memory.h
> > > +++ b/arch/arm/include/asm/memory.h
> > > @@ -68,8 +68,8 @@
> > > #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
> > >
> > > #define FDT_FIXED_BASE UL(0xff800000)
> > > -#define FDT_FIXED_SIZE (2 * PMD_SIZE)
> > > -#define FDT_VIRT_ADDR(physaddr) ((void *)(FDT_FIXED_BASE |
> > > (physaddr) % PMD_SIZE))
> > > +#define FDT_FIXED_SIZE (2 * SECTION_SIZE)
> > > +#define FDT_VIRT_ADDR(physaddr) ((void *)(FDT_FIXED_BASE |
> > > (physaddr) % SECTION_SIZE))
> >
> > Is this correct? If the FDT fixed size is 2x, why does FDT_VIRT_ADDR()
> > only work for half of it?
> >
>
> Perhaps the naming is confusing. This is only used to obtain the start
> of the virtually mapped DT, which amounts to the virtual address of
> the section plus the physical address modulo the section size.
>
> I will rename physaddr to physbase when I respin this as a patch.
> Shall I rename FDT_VIRT_ADDR to FDT_VIRT_BASE as well?
Yes please, I think that makes it clearer what is going on here.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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next prev parent reply other threads:[~2020-10-28 13:11 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-07 8:39 [PATCH v2 0/2] ARM: move FDT mapping out of linear region Ard Biesheuvel
2020-10-07 8:39 ` [PATCH v2 1/2] ARM: centralize phys-to-virt conversion of DT/ATAGS address Ard Biesheuvel
2020-10-07 15:28 ` Nicolas Pitre
2020-10-07 8:39 ` [PATCH v2 2/2] ARM: move device tree mapping out of linear region Ard Biesheuvel
2020-10-07 15:28 ` Nicolas Pitre
2020-10-07 15:32 ` Ard Biesheuvel
2020-10-07 16:38 ` Nicolas Pitre
2020-10-07 16:40 ` Nicolas Pitre
2020-10-07 21:32 ` Russell King - ARM Linux admin
2020-10-07 22:05 ` Nicolas Pitre
[not found] ` <CGME20201028091912eucas1p13fb9cd947faa6bfd79199ea79648b6af@eucas1p1.samsung.com>
2020-10-28 9:19 ` Marek Szyprowski
2020-10-28 9:22 ` Ard Biesheuvel
2020-10-28 9:24 ` Ard Biesheuvel
2020-10-28 9:43 ` Marek Szyprowski
2020-10-28 12:05 ` Joel Stanley
2020-10-28 12:52 ` Ard Biesheuvel
2020-10-28 12:59 ` Joel Stanley
2020-10-28 13:00 ` Ard Biesheuvel
2020-10-28 13:06 ` Joel Stanley
2020-10-28 13:00 ` Russell King - ARM Linux admin
2020-10-28 13:04 ` Ard Biesheuvel
2020-10-28 13:09 ` Russell King - ARM Linux admin [this message]
2020-10-28 13:16 ` Marek Szyprowski
2020-10-11 16:39 ` [PATCH v2 0/2] ARM: move FDT " Ard Biesheuvel
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