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/*
*
* (C) COPYRIGHT 2011-2016 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms
* of such GNU licence.
*
* A copy of the licence is included with the program, and can also be obtained
* from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef _KBASE_CONTEXT_H_
#define _KBASE_CONTEXT_H_
#include <linux/atomic.h>
int kbase_context_set_create_flags(struct kbase_context *kctx, u32 flags);
/**
* kbase_ctx_flag - Check if @flag is set on @kctx
* @kctx: Pointer to kbase context to check
* @flag: Flag to check
*
* Return: true if @flag is set on @kctx, false if not.
*/
static inline bool kbase_ctx_flag(struct kbase_context *kctx,
enum kbase_context_flags flag)
{
return atomic_read(&kctx->flags) & flag;
}
/**
* kbase_ctx_flag_clear - Clear @flag on @kctx
* @kctx: Pointer to kbase context
* @flag: Flag to clear
*
* Clear the @flag on @kctx. This is done atomically, so other flags being
* cleared or set at the same time will be safe.
*
* Some flags have locking requirements, check the documentation for the
* respective flags.
*/
static inline void kbase_ctx_flag_clear(struct kbase_context *kctx,
enum kbase_context_flags flag)
{
#if KERNEL_VERSION(4, 3, 0) > LINUX_VERSION_CODE
/*
* Earlier kernel versions doesn't have atomic_andnot() or
* atomic_and(). atomic_clear_mask() was only available on some
* architectures and removed on arm in v3.13 on arm and arm64.
*
* Use a compare-exchange loop to clear the flag on pre 4.3 kernels,
* when atomic_andnot() becomes available.
*/
int old, new;
do {
old = atomic_read(&kctx->flags);
new = old & ~flag;
} while (atomic_cmpxchg(&kctx->flags, old, new) != old);
#else
atomic_andnot(flag, &kctx->flags);
#endif
}
/**
* kbase_ctx_flag_set - Set @flag on @kctx
* @kctx: Pointer to kbase context
* @flag: Flag to clear
*
* Set the @flag on @kctx. This is done atomically, so other flags being
* cleared or set at the same time will be safe.
*
* Some flags have locking requirements, check the documentation for the
* respective flags.
*/
static inline void kbase_ctx_flag_set(struct kbase_context *kctx,
enum kbase_context_flags flag)
{
atomic_or(flag, &kctx->flags);
}
#endif /* _KBASE_CONTEXT_H_ */
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