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cmd.h	9.86 MB	View DL Edit
cq.h	4.85 MB	View DL Edit
device.h	41.82 MB	View DL Edit
doorbell.h	2.83 MB	View DL Edit
driver.h	2.96 MB	View DL Edit
qp.h	12.13 MB	View DL Edit
srq.h	1.59 MB	View DL Edit

Edit file: /usr/src/kernels/5.14.0-427.31.1.el9_4.x86_64/include/linux/mlx4/doorbell.h

/*
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 * Copyright (c) 2005 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 MLX4_DOORBELL_H
#define MLX4_DOORBELL_H

#include <linux/types.h>
#include <linux/io.h>

#define MLX4_SEND_DOORBELL    0x14
#define MLX4_CQ_DOORBELL      0x20

#if BITS_PER_LONG == 64
/*
 * 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.
 */

#define MLX4_DECLARE_DOORBELL_LOCK(name)
#define MLX4_INIT_DOORBELL_LOCK(ptr)    do { } while (0)
#define MLX4_GET_DOORBELL_LOCK(ptr)      (NULL)

static inline void mlx4_write64(__be32 val[2], void __iomem *dest,
				spinlock_t *doorbell_lock)
{
	__raw_writeq(*(u64 *) val, dest);
}

#else

/*
 * Just fall back to a spinlock to protect the doorbell if
 * BITS_PER_LONG is 32 -- there's no portable way to do atomic 64-bit
 * MMIO writes.
 */

#define MLX4_DECLARE_DOORBELL_LOCK(name) spinlock_t name;
#define MLX4_INIT_DOORBELL_LOCK(ptr)     spin_lock_init(ptr)
#define MLX4_GET_DOORBELL_LOCK(ptr)      (ptr)

static inline void mlx4_write64(__be32 val[2], void __iomem *dest,
				spinlock_t *doorbell_lock)
{
	unsigned long flags;

spin_lock_irqsave(doorbell_lock, flags);
	__raw_writel((__force u32) val[0], dest);
	__raw_writel((__force u32) val[1], dest + 4);
	spin_unlock_irqrestore(doorbell_lock, flags);
}

#endif

#endif /* MLX4_DOORBELL_H */

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