1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2// Copyright (c) 2018 Mellanox Technologies
3
4#include <linux/hyperv.h>
5#include "mlx5_core.h"
6#include "lib/hv.h"
7
8static int mlx5_hv_config_common(struct mlx5_core_dev *dev, void *buf, int len,
9				 int offset, bool read)
10{
11	int rc = -EOPNOTSUPP;
12	int bytes_returned;
13	int block_id;
14
15	if (offset % HV_CONFIG_BLOCK_SIZE_MAX || len != HV_CONFIG_BLOCK_SIZE_MAX)
16		return -EINVAL;
17
18	block_id = offset / HV_CONFIG_BLOCK_SIZE_MAX;
19
20	rc = read ?
21	     hyperv_read_cfg_blk(dev->pdev, buf,
22				 HV_CONFIG_BLOCK_SIZE_MAX, block_id,
23				 &bytes_returned) :
24	     hyperv_write_cfg_blk(dev->pdev, buf,
25				  HV_CONFIG_BLOCK_SIZE_MAX, block_id);
26
27	/* Make sure len bytes were read successfully  */
28	if (read && !rc && len != bytes_returned)
29		rc = -EIO;
30
31	if (rc) {
32		mlx5_core_err(dev, "Failed to %s hv config, err = %d, len = %d, offset = %d\n",
33			      read ? "read" : "write", rc, len,
34			      offset);
35		return rc;
36	}
37
38	return 0;
39}
40
41int mlx5_hv_read_config(struct mlx5_core_dev *dev, void *buf, int len,
42			int offset)
43{
44	return mlx5_hv_config_common(dev, buf, len, offset, true);
45}
46
47int mlx5_hv_write_config(struct mlx5_core_dev *dev, void *buf, int len,
48			 int offset)
49{
50	return mlx5_hv_config_common(dev, buf, len, offset, false);
51}
52
53int mlx5_hv_register_invalidate(struct mlx5_core_dev *dev, void *context,
54				void (*block_invalidate)(void *context,
55							 u64 block_mask))
56{
57	return hyperv_reg_block_invalidate(dev->pdev, context,
58					   block_invalidate);
59}
60
61void mlx5_hv_unregister_invalidate(struct mlx5_core_dev *dev)
62{
63	hyperv_reg_block_invalidate(dev->pdev, NULL, NULL);
64}
65