From: catalin.marinas@arm•com (Catalin Marinas)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v5 1/3] ARM: Introduce atomic MMIO modify
Date: Mon, 13 Jan 2014 13:58:58 +0000 [thread overview]
Message-ID: <20140113135858.GE11805@arm.com> (raw)
In-Reply-To: <20140112145206.GD6099@localhost>
On Sun, Jan 12, 2014 at 02:52:07PM +0000, Ezequiel Garcia wrote:
> On Thu, Jan 02, 2014 at 11:58:35AM -0300, Ezequiel Garcia wrote:
> > On Thu, Jan 02, 2014 at 09:47:24AM -0500, Jason Cooper wrote:
> > > On Thu, Jan 02, 2014 at 11:30:57AM +0000, Russell King - ARM Linux wrote:
> > > > On Tue, Dec 10, 2013 at 11:41:35AM -0300, Ezequiel Garcia wrote:
> > > > > Some SoC have MMIO regions that are shared across orthogonal
> > > > > subsystems. This commit implements a possible solution for the
> > > > > thread-safe access of such regions through a spinlock-protected API.
> > > > >
> > > > > Concurrent access is protected with a single spinlock for the
> > > > > entire MMIO address space. While this protects shared-registers,
> > > > > it also serializes access to unrelated/unshared registers.
> > > > >
> > > > > We add relaxed and non-relaxed variants, by using writel_relaxed and writel,
> > > > > respectively. The rationale for this is that some users may not require
> > > > > register write completion but only thread-safe access to a register.
> > > > >
> > > > > Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons•com>
> > > >
> > > > Okay, so this patch has been submitted to the patch system, but it
> > > > contains no other tags other than Ezequiel's sign-off. Clearly
> > > > other people *have* reviewed it.
> > > >
> > > > Can we please have some acks etc for it please?
> > >
> > > Acked-by: Jason Cooper <jason@lakedaemon•net>
>
> Catalin, Will: Can you ack as well, so Russell can take this?
Acked-by: Catalin Marinas <catalin.marinas@arm•com>
(with the condition that Will promises to sort out the generic relaxed
IO accessors and move this to generic code ;))
next prev parent reply other threads:[~2014-01-13 13:58 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-10 14:41 [PATCH v5 0/3] Introduce atomic MMIO register modify Ezequiel Garcia
2013-12-10 14:41 ` [PATCH v5 1/3] ARM: Introduce atomic MMIO modify Ezequiel Garcia
2013-12-10 16:49 ` Mark Brown
2013-12-10 17:00 ` Russell King - ARM Linux
2013-12-10 17:09 ` Mark Brown
2013-12-11 20:49 ` Ezequiel Garcia
2013-12-12 13:58 ` Will Deacon
2013-12-12 14:02 ` Jason Cooper
2013-12-12 14:07 ` Will Deacon
2013-12-12 14:36 ` Jason Cooper
2013-12-12 15:05 ` Ezequiel Garcia
2014-01-02 11:30 ` Russell King - ARM Linux
2014-01-02 14:47 ` Jason Cooper
2014-01-02 14:58 ` Ezequiel Garcia
2014-01-12 14:52 ` Ezequiel Garcia
2014-01-13 13:58 ` Catalin Marinas [this message]
2014-01-13 14:02 ` Russell King - ARM Linux
2014-01-13 15:28 ` Will Deacon
2014-01-15 17:15 ` Jason Cooper
2013-12-10 14:41 ` [PATCH v5 2/3] clocksource: orion: Use atomic access for shared registers Ezequiel Garcia
2013-12-12 13:53 ` Jason Cooper
2013-12-10 14:41 ` [PATCH v5 3/3] watchdog: " Ezequiel Garcia
2013-12-12 13:53 ` Jason Cooper
2013-12-12 13:52 ` [PATCH v5 0/3] Introduce atomic MMIO register modify Jason Cooper
2013-12-12 15:07 ` Ezequiel Garcia
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