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hwspinlock updates for v4.18

Browse source 
In addition to migrating the files to use SPDX license headers this
 introduces the ability for clients to operate a hwlock without the
 framework taking any additional locks.
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Merge tag 'hwlock-v4.18' of git://github.com/andersson/remoteproc

Pull hwspinlock updates from Bjorn Andersson:
 "In addition to migrating the files to use SPDX license headers this
  introduces the ability for clients to operate a hwlock without the
  framework taking any additional locks"

* tag 'hwlock-v4.18' of git://github.com/andersson/remoteproc:
  hwspinlock/u8500: Switch to SPDX license identifier
  hwspinlock: sprd: Switch to SPDX license identifier
  hwspinlock/sirf: Switch to SPDX license identifier
  hwspinlock: qcom: Switch to SPDX license identifier
  hwspinlock/omap: Switch to SPDX license identifier
  hwspinlock/core: Switch to SPDX license identifier
  hwspinlock: Introduce one new mode for hwspinlock
  hwspinlock: Convert to use 'switch' statement
This commit is contained in:
Linus Torvalds 2018-06-11 12:09:19 -07:00
commit 6f75edeadd
9 changed files with 118 additions and 81 deletions
Download patch file Download diff file Expand all files Collapse all files

68
include/linux/hwspinlock.h
View file

@ -1,18 +1,10 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Hardware spinlock public header
*
* Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
*
* Contact: Ohad Ben-Cohen <ohad@wizery.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __LINUX_HWSPINLOCK_H
@ -24,6 +16,7 @@
/* hwspinlock mode argument */
#define HWLOCK_IRQSTATE 0x01 /* Disable interrupts, save state */
#define HWLOCK_IRQ 0x02 /* Disable interrupts, don't save state */
#define HWLOCK_RAW 0x03
struct device;
struct device_node;
@ -175,6 +168,25 @@ static inline int hwspin_trylock_irq(struct hwspinlock *hwlock)
return __hwspin_trylock(hwlock, HWLOCK_IRQ, NULL);
}
/**
* hwspin_trylock_raw() - attempt to lock a specific hwspinlock
* @hwlock: an hwspinlock which we want to trylock
*
* This function attempts to lock an hwspinlock, and will immediately fail
* if the hwspinlock is already taken.
*
* Caution: User must protect the routine of getting hardware lock with mutex
* or spinlock to avoid dead-lock, that will let user can do some time-consuming
* or sleepable operations under the hardware lock.
*
* Returns 0 if we successfully locked the hwspinlock, -EBUSY if
* the hwspinlock was already taken, and -EINVAL if @hwlock is invalid.
*/
static inline int hwspin_trylock_raw(struct hwspinlock *hwlock)
{
return __hwspin_trylock(hwlock, HWLOCK_RAW, NULL);
}
/**
* hwspin_trylock() - attempt to lock a specific hwspinlock
* @hwlock: an hwspinlock which we want to trylock
@ -242,6 +254,29 @@ int hwspin_lock_timeout_irq(struct hwspinlock *hwlock, unsigned int to)
return __hwspin_lock_timeout(hwlock, to, HWLOCK_IRQ, NULL);
}
/**
* hwspin_lock_timeout_raw() - lock an hwspinlock with timeout limit
* @hwlock: the hwspinlock to be locked
* @to: timeout value in msecs
*
* This function locks the underlying @hwlock. If the @hwlock
* is already taken, the function will busy loop waiting for it to
* be released, but give up when @timeout msecs have elapsed.
*
* Caution: User must protect the routine of getting hardware lock with mutex
* or spinlock to avoid dead-lock, that will let user can do some time-consuming
* or sleepable operations under the hardware lock.
*
* Returns 0 when the @hwlock was successfully taken, and an appropriate
* error code otherwise (most notably an -ETIMEDOUT if the @hwlock is still
* busy after @timeout msecs). The function will never sleep.
*/
static inline
int hwspin_lock_timeout_raw(struct hwspinlock *hwlock, unsigned int to)
{
return __hwspin_lock_timeout(hwlock, to, HWLOCK_RAW, NULL);
}
/**
* hwspin_lock_timeout() - lock an hwspinlock with timeout limit
* @hwlock: the hwspinlock to be locked
@ -301,6 +336,21 @@ static inline void hwspin_unlock_irq(struct hwspinlock *hwlock)
__hwspin_unlock(hwlock, HWLOCK_IRQ, NULL);
}
/**
* hwspin_unlock_raw() - unlock hwspinlock
* @hwlock: a previously-acquired hwspinlock which we want to unlock
*
* This function will unlock a specific hwspinlock.
*
* @hwlock must be already locked (e.g. by hwspin_trylock()) before calling
* this function: it is a bug to call unlock on a @hwlock that is already
* unlocked.
*/
static inline void hwspin_unlock_raw(struct hwspinlock *hwlock)
{
__hwspin_unlock(hwlock, HWLOCK_RAW, NULL);
}
/**
* hwspin_unlock() - unlock hwspinlock
* @hwlock: a previously-acquired hwspinlock which we want to unlock