/* * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * - Redistributions of source code must retain the above * copyright notice, this list of conditions and the following * disclaimer. * * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #ifndef MLX5_DOORBELL_H #define MLX5_DOORBELL_H #define MLX5_BF_OFFSET 0x800 #define MLX5_CQ_DOORBELL 0x20 /* Assume that we can just write a 64-bit doorbell atomically. s390 * actually doesn't have writeq() but S/390 systems don't even have * PCI so we won't worry about it. * * Note that the write is not atomic on 32-bit systems! In contrast to 64-bit * ones, it requires proper locking. mlx5_write64 doesn't do any locking, so use * it at your own discretion, protected by some kind of lock on 32 bits. * * TODO: use write{q,l}_relaxed() */ static inline void mlx5_write64(__be32 val[2], void __iomem *dest) { #if BITS_PER_LONG == 64 __raw_writeq(*(u64 *)val, dest); #else __raw_writel((__force u32) val[0], dest); __raw_writel((__force u32) val[1], dest + 4); #endif } #endif /* MLX5_DOORBELL_H */