From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC][PATCH 2/2] ARM: ioremap: Add IO mapping space reused support.
Date: Mon, 12 May 2014 09:51:41 +0200 [thread overview]
Message-ID: <5146762.jba3IJe7xt@wuerfel> (raw)
In-Reply-To: <1399861195-21087-3-git-send-email-superlibj8301@gmail.com>
On Monday 12 May 2014 10:19:55 Richard Lee wrote:
> For the IO mapping, for the same physical address space maybe
> mapped more than one time, for example, in some SoCs:
> 0x20000000 ~ 0x20001000: are global control IO physical map,
> and this range space will be used by many drivers.
> And then if each driver will do the same ioremap operation, we
> will waste to much malloc virtual spaces.
>
> This patch add IO mapping space reused support.
>
> Signed-off-by: Richard Lee <superlibj@gmail.com>
What happens if the first driver then unmaps the area?
Arnd
WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de>
To: linux-arm-kernel@lists.infradead.org
Cc: Richard Lee <superlibj8301@gmail.com>,
linux@arm.linux.org.uk, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, Richard Lee <superlibj@gmail.com>
Subject: Re: [RFC][PATCH 2/2] ARM: ioremap: Add IO mapping space reused support.
Date: Mon, 12 May 2014 09:51:41 +0200 [thread overview]
Message-ID: <5146762.jba3IJe7xt@wuerfel> (raw)
In-Reply-To: <1399861195-21087-3-git-send-email-superlibj8301@gmail.com>
On Monday 12 May 2014 10:19:55 Richard Lee wrote:
> For the IO mapping, for the same physical address space maybe
> mapped more than one time, for example, in some SoCs:
> 0x20000000 ~ 0x20001000: are global control IO physical map,
> and this range space will be used by many drivers.
> And then if each driver will do the same ioremap operation, we
> will waste to much malloc virtual spaces.
>
> This patch add IO mapping space reused support.
>
> Signed-off-by: Richard Lee <superlibj@gmail.com>
What happens if the first driver then unmaps the area?
Arnd
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WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de>
To: linux-arm-kernel@lists.infradead.org
Cc: Richard Lee <superlibj8301@gmail.com>,
linux@arm.linux.org.uk, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, Richard Lee <superlibj@gmail.com>
Subject: Re: [RFC][PATCH 2/2] ARM: ioremap: Add IO mapping space reused support.
Date: Mon, 12 May 2014 09:51:41 +0200 [thread overview]
Message-ID: <5146762.jba3IJe7xt@wuerfel> (raw)
In-Reply-To: <1399861195-21087-3-git-send-email-superlibj8301@gmail.com>
On Monday 12 May 2014 10:19:55 Richard Lee wrote:
> For the IO mapping, for the same physical address space maybe
> mapped more than one time, for example, in some SoCs:
> 0x20000000 ~ 0x20001000: are global control IO physical map,
> and this range space will be used by many drivers.
> And then if each driver will do the same ioremap operation, we
> will waste to much malloc virtual spaces.
>
> This patch add IO mapping space reused support.
>
> Signed-off-by: Richard Lee <superlibj@gmail.com>
What happens if the first driver then unmaps the area?
Arnd
next prev parent reply other threads:[~2014-05-12 7:51 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-12 2:19 [RFC][PATCH 0/2] Add IO mapping space reused support Richard Lee
2014-05-12 2:19 ` Richard Lee
2014-05-12 2:19 ` Richard Lee
2014-05-12 2:19 ` [RFC][PATCH 1/2] mm/vmalloc: Add IO mapping space reused interface Richard Lee
2014-05-12 2:19 ` Richard Lee
2014-05-12 2:19 ` Richard Lee
2014-05-13 3:13 ` Rob Herring
2014-05-13 3:13 ` Rob Herring
2014-05-13 3:13 ` Rob Herring
2014-05-13 6:21 ` Richard Lee
2014-05-13 6:21 ` Richard Lee
2014-05-13 6:21 ` Richard Lee
2014-05-12 2:19 ` [RFC][PATCH 2/2] ARM: ioremap: Add IO mapping space reused support Richard Lee
2014-05-12 2:19 ` Richard Lee
2014-05-12 2:19 ` Richard Lee
2014-05-12 7:51 ` Arnd Bergmann [this message]
2014-05-12 7:51 ` Arnd Bergmann
2014-05-12 7:51 ` Arnd Bergmann
2014-05-13 1:45 ` Richard Lee
2014-05-13 1:45 ` Richard Lee
2014-05-13 1:45 ` Richard Lee
2014-05-13 8:43 ` Arnd Bergmann
2014-05-13 8:43 ` Arnd Bergmann
2014-05-13 8:43 ` Arnd Bergmann
2014-05-14 2:13 ` Richard Lee
2014-05-14 2:13 ` Richard Lee
2014-05-14 2:13 ` Richard Lee
2014-05-15 10:17 ` Catalin Marinas
2014-05-15 10:17 ` Catalin Marinas
2014-05-15 10:17 ` Catalin Marinas
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