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