On Tue, Oct 19, 2010 at 04:31:30PM -0700, Daniel Walker wrote:
On Mon, 2010-10-18 at 09:44 +0200, Ohad Ben-Cohen wrote:
OMAP4 introduces a Spinlock hardware module, which provides hardware
assistance for synchronization and mutual exclusion between heterogeneous
processors and those not
[resubmitting due to l-o being dropped from this discussion fork.
Thanks Russell for catching this]
On Wed, Oct 20, 2010 at 1:31 AM, Daniel Walker dwal...@codeaurora.org wrote:
On Mon, 2010-10-18 at 09:44 +0200, Ohad Ben-Cohen wrote:
OMAP4 introduces a Spinlock hardware module, which provides
On Wed, 2010-10-20 at 10:53 +0100, Russell King - ARM Linux wrote:
To: Ohad Ben-Cohen o...@wizery.com
Cc: Hari Kanigeri h-kanige...@ti.com, Benoit Cousson b-cous...@ti.com,
Tony Lindgren t...@atomide.com, Greg KH g...@kroah.com,
linux-ker...@vger.kernel.org,
Grant
Indeed. Where is that MSM code ?
We don't have an equivalent feature on MSM, nor any plans for one. Daniel was
thinking of an internal test feature that had been deprecated a while ago.
- Bryan
--
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center,
OMAP4 introduces a Spinlock hardware module, which provides hardware
assistance for synchronization and mutual exclusion between heterogeneous
processors and those not operating under a single, shared operating system
(e.g. OMAP4 has dual Cortex-A9, dual Cortex-M3 and a C64x+ DSP).
The intention
On Mon, 2010-10-18 at 09:44 +0200, Ohad Ben-Cohen wrote:
OMAP4 introduces a Spinlock hardware module, which provides hardware
assistance for synchronization and mutual exclusion between heterogeneous
processors and those not operating under a single, shared operating system
(e.g. OMAP4 has
On Mon, Oct 18, 2010 at 02:46:55PM +0200, Peter Zijlstra wrote:
On Mon, 2010-10-18 at 09:44 +0200, Ohad Ben-Cohen wrote:
OMAP4 introduces a Spinlock hardware module, which provides hardware
assistance for synchronization and mutual exclusion between heterogeneous
processors and those not
On Mon, 2010-10-18 at 14:35 +0100, Russell King - ARM Linux wrote:
On Mon, Oct 18, 2010 at 02:46:55PM +0200, Peter Zijlstra wrote:
On Mon, 2010-10-18 at 09:44 +0200, Ohad Ben-Cohen wrote:
OMAP4 introduces a Spinlock hardware module, which provides hardware
assistance for synchronization
On Mon, Oct 18, 2010 at 3:43 PM, Peter Zijlstra pet...@infradead.org wrote:
Right, so the problem is that there simply is no way to do atomic memory
access from these auxiliary processing units wrt the main CPU?
Yes. There are a few relevant system-wide limitations, one of them is
that simply
On Mon, 2010-10-18 at 16:28 +0200, Ohad Ben-Cohen wrote:
On Mon, Oct 18, 2010 at 3:43 PM, Peter Zijlstra pet...@infradead.org wrote:
Right, so the problem is that there simply is no way to do atomic memory
access from these auxiliary processing units wrt the main CPU?
Yes. There are a few
Peter Zijlstra pet...@infradead.org wrote:
On Mon, 2010-10-18 at 14:35 +0100, Russell King - ARM Linux wrote:
In any case, Linux's spinlock API (or more accurately, the ARM exclusive
access instructions) relies upon hardware coherency support (a piece of
hardware called an exclusive monitor)
On Mon, 2010-10-18 at 16:27 +0100, Catalin Marinas wrote:
Peter Zijlstra pet...@infradead.org wrote:
On Mon, 2010-10-18 at 14:35 +0100, Russell King - ARM Linux wrote:
In any case, Linux's spinlock API (or more accurately, the ARM exclusive
access instructions) relies upon hardware
On Mon, Oct 18, 2010 at 5:32 PM, Peter Zijlstra pet...@infradead.org wrote:
Sure, but you can 'easily' extend your coherency protocols with support
In our case, there are no coherency protocols supported between the
A9, M3 and the DSP.
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On Mon, 2010-10-18 at 17:35 +0200, Ohad Ben-Cohen wrote:
On Mon, Oct 18, 2010 at 5:32 PM, Peter Zijlstra pet...@infradead.org wrote:
Sure, but you can 'easily' extend your coherency protocols with support
In our case, there are no coherency protocols supported between the
A9, M3 and the
Peter Zijlstra pet...@infradead.org wrote:
On Mon, 2010-10-18 at 16:27 +0100, Catalin Marinas wrote:
Peter Zijlstra pet...@infradead.org wrote:
On Mon, 2010-10-18 at 14:35 +0100, Russell King - ARM Linux wrote:
In any case, Linux's spinlock API (or more accurately, the ARM exclusive
access
On Mon, 2010-10-18 at 16:51 +0100, Catalin Marinas wrote:
Peter Zijlstra pet...@infradead.org wrote:
On Mon, 2010-10-18 at 16:27 +0100, Catalin Marinas wrote:
Peter Zijlstra pet...@infradead.org wrote:
On Mon, 2010-10-18 at 14:35 +0100, Russell King - ARM Linux wrote:
In any case,
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