From: catalin.marinas@arm.com (Catalin Marinas)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 0/7] of: setup dma parameters using dma-ranges and dma-coherent
Date: Tue, 22 Apr 2014 17:01:03 +0100 [thread overview]
Message-ID: <20140422160103.GG10224@arm.com> (raw)
In-Reply-To: <CAL_JsqJktpEBE1rAXDKX8uNSrWzgP1Scucvzrtw0auQSC=SO_g@mail.gmail.com>
On Tue, Apr 22, 2014 at 04:30:36PM +0100, Rob Herring wrote:
> On Tue, Apr 22, 2014 at 10:25 AM, Catalin Marinas
> <catalin.marinas@arm.com> wrote:
> > On Tue, Apr 22, 2014 at 04:02:19PM +0100, Arnd Bergmann wrote:
> >> On Saturday 19 April 2014, Thomas Petazzoni wrote:
>
> [...]
>
> >> I would hope we can find a way to avoid the platform notifiers for
> >> mvebu as well and come up with a generic way to express this
> >> 'semi-coherent' mode. I believe x-gene has a similar issue, and
> >> I wouldn't be surprised if there are others like this.
> >
> > The solution is for the snooping unit to detect the DSB instruction
> > (which is propagated outside the CPU) and wait for the completion of the
> > coherency work (but we need more information from the hardware guys).
>
> If the solution was fixing broken h/w, we'd all be retired (or h/w
> designers). :)
At least they could admit it's a hardware bug and hopefully won't do the
same mistake in the future (wishful thinking ;)).
--
Catalin
WARNING: multiple messages have this Message-ID (diff)
From: Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>
To: Rob Herring <robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: "Arnd Bergmann" <arnd-r2nGTMty4D4@public.gmane.org>,
"Thomas Petazzoni"
<thomas.petazzoni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
"Santosh Shilimkar"
<santosh.shilimkar-l0cyMroinI0@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"Grygorii Strashko"
<grygorii.strashko-l0cyMroinI0@public.gmane.org>,
"Russell King" <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>,
"Greg Kroah-Hartman"
<gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>,
"Linus Walleij"
<linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
"grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org"
<grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
"Rob Herring" <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
"Olof Johansson" <olof-nZhT3qVonbNeoWH0uzbU5w@public.gmane.org>,
"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
"Gregory Clément"
<gregory.clement-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
"Ezequiel Garcia"
<ezequiel.garcia-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
"Lior Amsalem" <alior-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>,
"Tawfik Bayouk" <tawfik-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>
Subject: Re: [PATCH v2 0/7] of: setup dma parameters using dma-ranges and dma-coherent
Date: Tue, 22 Apr 2014 17:01:03 +0100 [thread overview]
Message-ID: <20140422160103.GG10224@arm.com> (raw)
In-Reply-To: <CAL_JsqJktpEBE1rAXDKX8uNSrWzgP1Scucvzrtw0auQSC=SO_g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On Tue, Apr 22, 2014 at 04:30:36PM +0100, Rob Herring wrote:
> On Tue, Apr 22, 2014 at 10:25 AM, Catalin Marinas
> <catalin.marinas-5wv7dgnIgG8@public.gmane.org> wrote:
> > On Tue, Apr 22, 2014 at 04:02:19PM +0100, Arnd Bergmann wrote:
> >> On Saturday 19 April 2014, Thomas Petazzoni wrote:
>
> [...]
>
> >> I would hope we can find a way to avoid the platform notifiers for
> >> mvebu as well and come up with a generic way to express this
> >> 'semi-coherent' mode. I believe x-gene has a similar issue, and
> >> I wouldn't be surprised if there are others like this.
> >
> > The solution is for the snooping unit to detect the DSB instruction
> > (which is propagated outside the CPU) and wait for the completion of the
> > coherency work (but we need more information from the hardware guys).
>
> If the solution was fixing broken h/w, we'd all be retired (or h/w
> designers). :)
At least they could admit it's a hardware bug and hopefully won't do the
same mistake in the future (wishful thinking ;)).
--
Catalin
--
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WARNING: multiple messages have this Message-ID (diff)
From: Catalin Marinas <catalin.marinas@arm.com>
To: Rob Herring <robherring2@gmail.com>
Cc: "Arnd Bergmann" <arnd@arndb.de>,
"Thomas Petazzoni" <thomas.petazzoni@free-electrons.com>,
"Santosh Shilimkar" <santosh.shilimkar@ti.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"Grygorii Strashko" <grygorii.strashko@ti.com>,
"Russell King" <linux@arm.linux.org.uk>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Linus Walleij" <linus.walleij@linaro.org>,
"grant.likely@linaro.org" <grant.likely@linaro.org>,
"Rob Herring" <robh+dt@kernel.org>,
"Olof Johansson" <olof@lixom.net>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"Gregory Clément" <gregory.clement@free-electrons.com>,
"Ezequiel Garcia" <ezequiel.garcia@free-electrons.com>,
"Lior Amsalem" <alior@marvell.com>,
"Tawfik Bayouk" <tawfik@marvell.com>
Subject: Re: [PATCH v2 0/7] of: setup dma parameters using dma-ranges and dma-coherent
Date: Tue, 22 Apr 2014 17:01:03 +0100 [thread overview]
Message-ID: <20140422160103.GG10224@arm.com> (raw)
In-Reply-To: <CAL_JsqJktpEBE1rAXDKX8uNSrWzgP1Scucvzrtw0auQSC=SO_g@mail.gmail.com>
On Tue, Apr 22, 2014 at 04:30:36PM +0100, Rob Herring wrote:
> On Tue, Apr 22, 2014 at 10:25 AM, Catalin Marinas
> <catalin.marinas@arm.com> wrote:
> > On Tue, Apr 22, 2014 at 04:02:19PM +0100, Arnd Bergmann wrote:
> >> On Saturday 19 April 2014, Thomas Petazzoni wrote:
>
> [...]
>
> >> I would hope we can find a way to avoid the platform notifiers for
> >> mvebu as well and come up with a generic way to express this
> >> 'semi-coherent' mode. I believe x-gene has a similar issue, and
> >> I wouldn't be surprised if there are others like this.
> >
> > The solution is for the snooping unit to detect the DSB instruction
> > (which is propagated outside the CPU) and wait for the completion of the
> > coherency work (but we need more information from the hardware guys).
>
> If the solution was fixing broken h/w, we'd all be retired (or h/w
> designers). :)
At least they could admit it's a hardware bug and hopefully won't do the
same mistake in the future (wishful thinking ;)).
--
Catalin
next prev parent reply other threads:[~2014-04-22 16:01 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-19 14:32 [PATCH v2 0/7] of: setup dma parameters using dma-ranges and dma-coherent Santosh Shilimkar
2014-04-19 14:32 ` Santosh Shilimkar
2014-04-19 14:32 ` Santosh Shilimkar
2014-04-19 14:32 ` [PATCH v2 1/7] device: introduce per device dma_pfn_offset Santosh Shilimkar
2014-04-19 14:32 ` Santosh Shilimkar
2014-04-19 14:32 ` Santosh Shilimkar
2014-04-19 14:32 ` [PATCH v2 2/7] of: introduce of_dma_get_range() helper Santosh Shilimkar
2014-04-19 14:32 ` Santosh Shilimkar
2014-04-19 14:32 ` Santosh Shilimkar
2014-04-21 15:29 ` Rob Herring
2014-04-21 15:29 ` Rob Herring
2014-04-21 15:29 ` Rob Herring
2014-04-22 14:56 ` Grygorii Strashko
2014-04-22 14:56 ` Grygorii Strashko
2014-04-22 14:56 ` Grygorii Strashko
2014-04-22 4:09 ` Joel Fernandes
2014-04-22 4:09 ` Joel Fernandes
2014-04-22 4:09 ` Joel Fernandes
2014-04-19 14:32 ` [PATCH v2 3/7] of: introduce of_dma_is_coherent() helper Santosh Shilimkar
2014-04-19 14:32 ` Santosh Shilimkar
2014-04-19 14:32 ` Santosh Shilimkar
2014-04-19 14:32 ` [PATCH v2 4/7] of: configure the platform device dma parameters Santosh Shilimkar
2014-04-19 14:32 ` Santosh Shilimkar
2014-04-19 14:32 ` Santosh Shilimkar
2014-04-21 14:58 ` Rob Herring
2014-04-21 14:58 ` Rob Herring
2014-04-21 14:58 ` Rob Herring
2014-04-22 15:09 ` Grygorii Strashko
2014-04-22 15:09 ` Grygorii Strashko
2014-04-22 15:09 ` Grygorii Strashko
2014-04-22 14:44 ` Rob Herring
2014-04-22 14:44 ` Rob Herring
2014-04-22 14:44 ` Rob Herring
2014-04-22 15:44 ` Grygorii Strashko
2014-04-22 15:44 ` Grygorii Strashko
2014-04-19 14:32 ` [PATCH v2 5/7] ARM: dma: Use dma_pfn_offset for dma address translation Santosh Shilimkar
2014-04-19 14:32 ` Santosh Shilimkar
2014-04-19 14:32 ` Santosh Shilimkar
2014-04-19 19:43 ` Russell King - ARM Linux
2014-04-19 19:43 ` Russell King - ARM Linux
2014-04-19 19:43 ` Russell King - ARM Linux
2014-04-21 13:38 ` Santosh Shilimkar
2014-04-21 13:38 ` Santosh Shilimkar
2014-04-21 13:38 ` Santosh Shilimkar
2014-04-19 14:32 ` [PATCH v2 6/7] ARM: dma: implement set_arch_dma_coherent_ops() Santosh Shilimkar
2014-04-19 14:32 ` Santosh Shilimkar
2014-04-19 14:32 ` Santosh Shilimkar
2014-04-19 14:32 ` [PATCH v2 7/7] ARM: mm: use phys_addr_t in __dma_page_[cpu_to_dev/dev_to_cpu] Santosh Shilimkar
2014-04-19 14:32 ` Santosh Shilimkar
2014-04-19 14:32 ` Santosh Shilimkar
2014-04-21 13:39 ` Santosh Shilimkar
2014-04-21 13:39 ` Santosh Shilimkar
2014-04-21 13:39 ` Santosh Shilimkar
2014-04-19 16:25 ` [PATCH v2 0/7] of: setup dma parameters using dma-ranges and dma-coherent Thomas Petazzoni
2014-04-19 16:25 ` Thomas Petazzoni
2014-04-19 16:25 ` Thomas Petazzoni
2014-04-21 13:35 ` Santosh Shilimkar
2014-04-21 13:35 ` Santosh Shilimkar
2014-04-21 13:35 ` Santosh Shilimkar
2014-04-21 18:19 ` Thomas Petazzoni
2014-04-21 18:19 ` Thomas Petazzoni
2014-04-21 19:17 ` Santosh Shilimkar
2014-04-21 19:17 ` Santosh Shilimkar
2014-04-21 19:17 ` Santosh Shilimkar
2014-04-22 14:54 ` Catalin Marinas
2014-04-22 14:54 ` Catalin Marinas
2014-04-22 15:02 ` Arnd Bergmann
2014-04-22 15:02 ` Arnd Bergmann
2014-04-22 15:02 ` Arnd Bergmann
2014-04-22 15:15 ` Santosh Shilimkar
2014-04-22 15:15 ` Santosh Shilimkar
2014-04-22 15:15 ` Santosh Shilimkar
2014-04-22 15:25 ` Catalin Marinas
2014-04-22 15:25 ` Catalin Marinas
2014-04-22 15:25 ` Catalin Marinas
2014-04-22 15:30 ` Rob Herring
2014-04-22 15:30 ` Rob Herring
2014-04-22 15:30 ` Rob Herring
2014-04-22 16:01 ` Catalin Marinas [this message]
2014-04-22 16:01 ` Catalin Marinas
2014-04-22 16:01 ` Catalin Marinas
2014-04-21 14:37 ` Rob Herring
2014-04-21 14:37 ` Rob Herring
2014-04-21 14:37 ` Rob Herring
2014-04-21 15:13 ` Santosh Shilimkar
2014-04-21 15:13 ` Santosh Shilimkar
2014-04-21 15:35 ` Rob Herring
2014-04-21 15:35 ` Rob Herring
2014-04-21 15:35 ` Rob Herring
2014-04-21 15:36 ` Santosh Shilimkar
2014-04-21 15:36 ` Santosh Shilimkar
2014-04-21 15:36 ` Santosh Shilimkar
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