kernel/linux.git/include/linux/hwspinlock.h, branch v6.19.11

hwspinlock: Remove unused hwspin_lock_get_id()

2025-03-21T22:12:04+00:00

hwspin_lock_get_id() has been unused since the original 2011 commit bd9a4c7df256 ("drivers: hwspinlock: add framework") Remove it and the corresponding docs. Note that the of_hwspin_lock_get_id() version is still in use, so leave that alone. Signed-off-by: Dr. David Alan Gilbert Reviewed-by: Baolin Wang Link: https://lore.kernel.org/r/20241215022023.181435-1-linux@treblig.org Signed-off-by: Bjorn Andersson

hwspinlock: Remove unused (devm_)hwspin_lock_request()

2025-03-21T22:12:04+00:00

devm_hwspin_lock_request() was added by 2018's commit 4f1acd758b08 ("hwspinlock: Add devm_xxx() APIs to request/free hwlock") however, it's never been used, everyone uses the devm_hwspin_lock_request_specific() call instead. Remove it. Similarly, the none-devm variant isn't used. Remove it, and the referring documentation. Signed-off-by: Dr. David Alan Gilbert Reviewed-by: Baolin Wang Link: https://lore.kernel.org/r/20241027205445.239108-1-linux@treblig.org Signed-off-by: Bjorn Andersson

hwspinlock: Introduce hwspin_lock_bust()

2024-05-29T19:52:26+00:00

When a remoteproc crashes or goes down unexpectedly this can result in a state where locks held by the remoteproc will remain locked possibly resulting in deadlock. This new API hwspin_lock_bust() allows hwspinlock implementers to define a bust operation for freeing previously acquired hwspinlocks after verifying ownership of the acquired lock. Signed-off-by: Richard Maina Reviewed-by: Bjorn Andersson Signed-off-by: Chris Lew Link: https://lore.kernel.org/r/20240529-hwspinlock-bust-v3-1-c8b924ffa5a2@quicinc.com Signed-off-by: Bjorn Andersson

hwspinlock: add the 'in_atomic' API

2019-06-30T04:08:14+00:00

Add the 'in_atomic' mode which can be called from an atomic context. This mode relies on the existing 'raw' mode (no lock, no preemption/irq disabling) with the difference that the timeout is not based on jiffies (jiffies won't increase when irq are disabled) but handled with busy-waiting udelay() calls. Signed-off-by: Fabien Dessenne Signed-off-by: Bjorn Andersson

hwspinlock: Remove redundant config

2018-06-26T20:46:28+00:00

The hardware core can not be built as a module, so remove the redundant CONFIG_HWSPINLOCK_MODULE config. Signed-off-by: Baolin Wang Signed-off-by: Bjorn Andersson

hwspinlock: Add devm_xxx() APIs to register/unregister one hwlock controller

2018-06-26T20:46:23+00:00

This patch introduces devm_hwspin_lock_register() and devm_hwspin_lock_unregister() interfaces to help to register or unregister one hardware spinlock controller, that will help to simplify the cleanup code for hwspinlock drivers. Signed-off-by: Baolin Wang Signed-off-by: Bjorn Andersson

hwspinlock: Add devm_xxx() APIs to request/free hwlock

2018-06-26T20:27:58+00:00

This patch introduces some devm_xxx() APIs to help to request or free the hwlocks, which will help to simplify the cleanup code for drivers requesting one hwlock, ensuring that the hwlock is automatically freed whenever the device is unbound. Signed-off-by: Baolin Wang Signed-off-by: Bjorn Andersson

hwspinlock: Add one new API to support getting a specific hwlock by the name

2018-06-26T20:27:22+00:00

The hardware spinlock binding already supplied the 'hwlock-names' property to match and get a specific hwlock, but did not supply one API for users to get a specific hwlock by the hwlock name. So this patch introduces one API to support this requirement. Signed-off-by: Baolin Wang Signed-off-by: Bjorn Andersson

hwspinlock/core: Switch to SPDX license identifier

2018-05-24T19:04:32+00:00

Use the appropriate SPDX license identifier in the Hwspinlock core driver source files and drop the previous boilerplate license text. Signed-off-by: Suman Anna Signed-off-by: Bjorn Andersson

hwspinlock: Introduce one new mode for hwspinlock

2018-04-17T21:49:21+00:00

In some scenarios, user need do some time-consuming or sleepable operations under the hardware spinlock protection for synchronization between the multiple subsystems. For example, there is one PMIC efuse on Spreadtrum platform, which need to be accessed under one hardware lock. But during the hardware lock protection, the efuse operation is time-consuming to almost 5 ms, so we can not disable the interrupts or preemption so long in this case. Thus we can introduce one new mode to indicate that we just acquire the hardware lock and do not disable interrupts or preemption, meanwhile we should force user to protect the hardware lock with mutex or spinlock to avoid dead-lock. Signed-off-by: Baolin Wang Signed-off-by: Bjorn Andersson