cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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doorbell.h (2894B)

      1/*
      2 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
      3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
      4 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
      5 *
      6 * This software is available to you under a choice of one of two
      7 * licenses.  You may choose to be licensed under the terms of the GNU
      8 * General Public License (GPL) Version 2, available from the file
      9 * COPYING in the main directory of this source tree, or the
     10 * OpenIB.org BSD license below:
     11 *
     12 *     Redistribution and use in source and binary forms, with or
     13 *     without modification, are permitted provided that the following
     14 *     conditions are met:
     15 *
     16 *      - Redistributions of source code must retain the above
     17 *        copyright notice, this list of conditions and the following
     18 *        disclaimer.
     19 *
     20 *      - Redistributions in binary form must reproduce the above
     21 *        copyright notice, this list of conditions and the following
     22 *        disclaimer in the documentation and/or other materials
     23 *        provided with the distribution.
     24 *
     25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
     29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
     30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     32 * SOFTWARE.
     33 */
     34
     35#ifndef MLX4_DOORBELL_H
     36#define MLX4_DOORBELL_H
     37
     38#include <linux/types.h>
     39#include <linux/io.h>
     40
     41#define MLX4_SEND_DOORBELL    0x14
     42#define MLX4_CQ_DOORBELL      0x20
     43
     44#if BITS_PER_LONG == 64
     45/*
     46 * Assume that we can just write a 64-bit doorbell atomically.  s390
     47 * actually doesn't have writeq() but S/390 systems don't even have
     48 * PCI so we won't worry about it.
     49 */
     50
     51#define MLX4_DECLARE_DOORBELL_LOCK(name)
     52#define MLX4_INIT_DOORBELL_LOCK(ptr)    do { } while (0)
     53#define MLX4_GET_DOORBELL_LOCK(ptr)      (NULL)
     54
     55static inline void mlx4_write64(__be32 val[2], void __iomem *dest,
     56				spinlock_t *doorbell_lock)
     57{
     58	__raw_writeq(*(u64 *) val, dest);
     59}
     60
     61#else
     62
     63/*
     64 * Just fall back to a spinlock to protect the doorbell if
     65 * BITS_PER_LONG is 32 -- there's no portable way to do atomic 64-bit
     66 * MMIO writes.
     67 */
     68
     69#define MLX4_DECLARE_DOORBELL_LOCK(name) spinlock_t name;
     70#define MLX4_INIT_DOORBELL_LOCK(ptr)     spin_lock_init(ptr)
     71#define MLX4_GET_DOORBELL_LOCK(ptr)      (ptr)
     72
     73static inline void mlx4_write64(__be32 val[2], void __iomem *dest,
     74				spinlock_t *doorbell_lock)
     75{
     76	unsigned long flags;
     77
     78	spin_lock_irqsave(doorbell_lock, flags);
     79	__raw_writel((__force u32) val[0], dest);
     80	__raw_writel((__force u32) val[1], dest + 4);
     81	spin_unlock_irqrestore(doorbell_lock, flags);
     82}
     83
     84#endif
     85
     86#endif /* MLX4_DOORBELL_H */