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authorLinus Torvalds <torvalds@linux-foundation.org>2018-06-11 22:09:19 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-06-11 22:09:19 +0300
commit6f75edeadd0dd3d58017bc3bcdc2b80879a7cfd3 (patch)
treee75729deec3343feec7a19820fba633df4aea9b0 /drivers/hwspinlock
parentd2b2250c3e565038a746b5db1de2af20a6468f02 (diff)
parente759176c7f6b6d84a31276e11d687f232f6e4ecf (diff)
downloadlinux-6f75edeadd0dd3d58017bc3bcdc2b80879a7cfd3.tar.xz
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
Diffstat (limited to 'drivers/hwspinlock')
-rw-r--r--drivers/hwspinlock/Kconfig1
-rw-r--r--drivers/hwspinlock/hwspinlock_core.c77
-rw-r--r--drivers/hwspinlock/hwspinlock_internal.h10
-rw-r--r--drivers/hwspinlock/omap_hwspinlock.c10
-rw-r--r--drivers/hwspinlock/qcom_hwspinlock.c10
-rw-r--r--drivers/hwspinlock/sirf_hwspinlock.c3
-rw-r--r--drivers/hwspinlock/sprd_hwspinlock.c10
-rw-r--r--drivers/hwspinlock/u8500_hsem.c10
8 files changed, 59 insertions, 72 deletions
diff --git a/drivers/hwspinlock/Kconfig b/drivers/hwspinlock/Kconfig
index f0f467983960..e895d29500ee 100644
--- a/drivers/hwspinlock/Kconfig
+++ b/drivers/hwspinlock/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
#
# Generic HWSPINLOCK framework
#
diff --git a/drivers/hwspinlock/hwspinlock_core.c b/drivers/hwspinlock/hwspinlock_core.c
index 4074441444fe..d16e6a3d38e8 100644
--- a/drivers/hwspinlock/hwspinlock_core.c
+++ b/drivers/hwspinlock/hwspinlock_core.c
@@ -1,18 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* Hardware spinlock framework
*
* 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.
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
@@ -71,10 +63,16 @@ static DEFINE_MUTEX(hwspinlock_tree_lock);
* This function attempts to lock an hwspinlock, and will immediately
* fail if the hwspinlock is already taken.
*
- * Upon a successful return from this function, preemption (and possibly
- * interrupts) is disabled, so the caller must not sleep, and is advised to
- * release the hwspinlock as soon as possible. This is required in order to
- * minimize remote cores polling on the hardware interconnect.
+ * Caution: If the mode is HWLOCK_RAW, that means user must protect the routine
+ * of getting hardware lock with mutex or spinlock. Since in some scenarios,
+ * user need some time-consuming or sleepable operations under the hardware
+ * lock, they need one sleepable lock (like mutex) to protect the operations.
+ *
+ * If the mode is not HWLOCK_RAW, upon a successful return from this function,
+ * preemption (and possibly interrupts) is disabled, so the caller must not
+ * sleep, and is advised to release the hwspinlock as soon as possible. This is
+ * required in order to minimize remote cores polling on the hardware
+ * interconnect.
*
* The user decides whether local interrupts are disabled or not, and if yes,
* whether he wants their previous state to be saved. It is up to the user
@@ -106,12 +104,20 @@ int __hwspin_trylock(struct hwspinlock *hwlock, int mode, unsigned long *flags)
* problems with hwspinlock usage (e.g. scheduler checks like
* 'scheduling while atomic' etc.)
*/
- if (mode == HWLOCK_IRQSTATE)
+ switch (mode) {
+ case HWLOCK_IRQSTATE:
ret = spin_trylock_irqsave(&hwlock->lock, *flags);
- else if (mode == HWLOCK_IRQ)
+ break;
+ case HWLOCK_IRQ:
ret = spin_trylock_irq(&hwlock->lock);
- else
+ break;
+ case HWLOCK_RAW:
+ ret = 1;
+ break;
+ default:
ret = spin_trylock(&hwlock->lock);
+ break;
+ }
/* is lock already taken by another context on the local cpu ? */
if (!ret)
@@ -122,12 +128,20 @@ int __hwspin_trylock(struct hwspinlock *hwlock, int mode, unsigned long *flags)
/* if hwlock is already taken, undo spin_trylock_* and exit */
if (!ret) {
- if (mode == HWLOCK_IRQSTATE)
+ switch (mode) {
+ case HWLOCK_IRQSTATE:
spin_unlock_irqrestore(&hwlock->lock, *flags);
- else if (mode == HWLOCK_IRQ)
+ break;
+ case HWLOCK_IRQ:
spin_unlock_irq(&hwlock->lock);
- else
+ break;
+ case HWLOCK_RAW:
+ /* Nothing to do */
+ break;
+ default:
spin_unlock(&hwlock->lock);
+ break;
+ }
return -EBUSY;
}
@@ -160,9 +174,14 @@ EXPORT_SYMBOL_GPL(__hwspin_trylock);
* is already taken, the function will busy loop waiting for it to
* be released, but give up after @timeout msecs have elapsed.
*
- * Upon a successful return from this function, preemption is disabled
- * (and possibly local interrupts, too), so the caller must not sleep,
- * and is advised to release the hwspinlock as soon as possible.
+ * Caution: If the mode is HWLOCK_RAW, that means user must protect the routine
+ * of getting hardware lock with mutex or spinlock. Since in some scenarios,
+ * user need some time-consuming or sleepable operations under the hardware
+ * lock, they need one sleepable lock (like mutex) to protect the operations.
+ *
+ * If the mode is not HWLOCK_RAW, upon a successful return from this function,
+ * preemption is disabled (and possibly local interrupts, too), so the caller
+ * must not sleep, and is advised to release the hwspinlock as soon as possible.
* This is required in order to minimize remote cores polling on the
* hardware interconnect.
*
@@ -249,12 +268,20 @@ void __hwspin_unlock(struct hwspinlock *hwlock, int mode, unsigned long *flags)
hwlock->bank->ops->unlock(hwlock);
/* Undo the spin_trylock{_irq, _irqsave} called while locking */
- if (mode == HWLOCK_IRQSTATE)
+ switch (mode) {
+ case HWLOCK_IRQSTATE:
spin_unlock_irqrestore(&hwlock->lock, *flags);
- else if (mode == HWLOCK_IRQ)
+ break;
+ case HWLOCK_IRQ:
spin_unlock_irq(&hwlock->lock);
- else
+ break;
+ case HWLOCK_RAW:
+ /* Nothing to do */
+ break;
+ default:
spin_unlock(&hwlock->lock);
+ break;
+ }
}
EXPORT_SYMBOL_GPL(__hwspin_unlock);
diff --git a/drivers/hwspinlock/hwspinlock_internal.h b/drivers/hwspinlock/hwspinlock_internal.h
index d26f78b8f214..9eb6bd020dc7 100644
--- a/drivers/hwspinlock/hwspinlock_internal.h
+++ b/drivers/hwspinlock/hwspinlock_internal.h
@@ -1,18 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
/*
* Hardware spinlocks internal 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 __HWSPINLOCK_HWSPINLOCK_H
diff --git a/drivers/hwspinlock/omap_hwspinlock.c b/drivers/hwspinlock/omap_hwspinlock.c
index d897e5251c36..625844e0abef 100644
--- a/drivers/hwspinlock/omap_hwspinlock.c
+++ b/drivers/hwspinlock/omap_hwspinlock.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* OMAP hardware spinlock driver
*
@@ -6,15 +7,6 @@
* Contact: Simon Que <sque@ti.com>
* Hari Kanigeri <h-kanigeri2@ti.com>
* 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.
*/
#include <linux/kernel.h>
diff --git a/drivers/hwspinlock/qcom_hwspinlock.c b/drivers/hwspinlock/qcom_hwspinlock.c
index fa6880b8060a..6da7447d277d 100644
--- a/drivers/hwspinlock/qcom_hwspinlock.c
+++ b/drivers/hwspinlock/qcom_hwspinlock.c
@@ -1,15 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2013, The Linux Foundation. All rights reserved.
* Copyright (c) 2015, Sony Mobile Communications AB
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * 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.
*/
#include <linux/hwspinlock.h>
diff --git a/drivers/hwspinlock/sirf_hwspinlock.c b/drivers/hwspinlock/sirf_hwspinlock.c
index cb38e487c6c4..1f625cd68c50 100644
--- a/drivers/hwspinlock/sirf_hwspinlock.c
+++ b/drivers/hwspinlock/sirf_hwspinlock.c
@@ -1,9 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* SIRF hardware spinlock driver
*
* Copyright (c) 2015 Cambridge Silicon Radio Limited, a CSR plc group company.
- *
- * Licensed under GPLv2.
*/
#include <linux/kernel.h>
diff --git a/drivers/hwspinlock/sprd_hwspinlock.c b/drivers/hwspinlock/sprd_hwspinlock.c
index 638e64ac18f5..dc42bf51f3e6 100644
--- a/drivers/hwspinlock/sprd_hwspinlock.c
+++ b/drivers/hwspinlock/sprd_hwspinlock.c
@@ -1,15 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* Spreadtrum hardware spinlock driver
* Copyright (C) 2017 Spreadtrum - http://www.spreadtrum.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.
*/
#include <linux/bitops.h>
diff --git a/drivers/hwspinlock/u8500_hsem.c b/drivers/hwspinlock/u8500_hsem.c
index 0128d8fb905e..572ca79d77e8 100644
--- a/drivers/hwspinlock/u8500_hsem.c
+++ b/drivers/hwspinlock/u8500_hsem.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* u8500 HWSEM driver
*
@@ -10,15 +11,6 @@
* Simon Que <sque@ti.com>
* Hari Kanigeri <h-kanigeri2@ti.com>
* 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.
*/
#include <linux/module.h>