| /* |
| * |
| * (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_ */ |
