linux-kernel - Re: [PATCH RFC v2 0/2] hwspinlock: Introduce raw capability for hwspinlock

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Date:	Fri, 26 Jun 2015 21:05:14 -0600
From:	Lina Iyer <lina.iyer@...aro.org>
To:	ohad@...ery.com
Cc:	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC v2 0/2] hwspinlock: Introduce raw capability for
 hwspinlock_device

Hi Ohad,

Any comments?

Thanks,
Lina

On Tue, Jun 09 2015 at 10:23 -0600, Lina Iyer wrote:
>This patch follows the discussion based on the first RFC series posted on the
>mailing list [1]. The discussion resulted in a couple of directives for
>hwspinlocks that do not want the framework imposing a s/w spinlock around the
>hwspinlock.
>
>i. The default should only be a s/w spinlock around the hwspinlock to ensure
>correctness of locking.
>
>ii. Existing users may not use raw capability, unless the platform registers
>support for it.
>
>iii. Platform driver for hwspinlock should dictate which locks can be operated
>in raw mode.
>
>iv. Platform driver and the hw holds the responsibility to ensure the
>correctness of acquiring the hwspinlock.
>
>This patchset implements these directives.
>
>Changes since RFC v1:
>- Introduce 'raw' capability for hwspinlocks.
>- Platform code now has to explicitly specify the raw capability of a lock.
>- Check to ensure that only those locks explicitly marked as raw capable can be
>  locked/unlocked through the _raw api
>- QCOM patch for making lock #7 raw capable added.
>- Add documentation
>
>Thanks,
>Lina
>
>[1]. https://patches.linaro.org/47895/
>
>Lina Iyer (2):
>  hwspinlock: Introduce raw capability for hwspinlocks
>  hwspinlock: qcom: Lock #7 is special lock, uses dynamic proc_id
>
> Documentation/hwspinlock.txt             | 16 +++++++
> drivers/hwspinlock/hwspinlock_core.c     | 75 +++++++++++++++++++-------------
> drivers/hwspinlock/hwspinlock_internal.h |  6 +++
> drivers/hwspinlock/qcom_hwspinlock.c     | 22 +++++++---
> include/linux/hwspinlock.h               | 41 +++++++++++++++++
> 5 files changed, 125 insertions(+), 35 deletions(-)
>
>-- 
>2.1.4
>
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