1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
/*
* CXL Flash Device Driver
*
* Written by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
* Uma Krishnan <ukrishn@linux.vnet.ibm.com>, IBM Corporation
*
* Copyright (C) 2018 IBM Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <misc/ocxl.h>
#include "backend.h"
#include "ocxl_hw.h"
/**
* ocxlflash_destroy_afu() - destroy the AFU structure
* @afu_cookie: AFU to be freed.
*/
static void ocxlflash_destroy_afu(void *afu_cookie)
{
struct ocxl_hw_afu *afu = afu_cookie;
if (!afu)
return;
kfree(afu);
}
/**
* ocxlflash_config_fn() - configure the host function
* @pdev: PCI device associated with the host.
* @afu: AFU associated with the host.
*
* Return: 0 on success, -errno on failure
*/
static int ocxlflash_config_fn(struct pci_dev *pdev, struct ocxl_hw_afu *afu)
{
struct ocxl_fn_config *fcfg = &afu->fcfg;
struct device *dev = &pdev->dev;
int rc = 0;
/* Read DVSEC config of the function */
rc = ocxl_config_read_function(pdev, fcfg);
if (unlikely(rc)) {
dev_err(dev, "%s: ocxl_config_read_function failed rc=%d\n",
__func__, rc);
goto out;
}
/* Check if function has AFUs defined, only 1 per function supported */
if (fcfg->max_afu_index >= 0) {
afu->is_present = true;
if (fcfg->max_afu_index != 0)
dev_warn(dev, "%s: Unexpected AFU index value %d\n",
__func__, fcfg->max_afu_index);
}
out:
return rc;
}
/**
* ocxlflash_create_afu() - create the AFU for OCXL
* @pdev: PCI device associated with the host.
*
* Return: AFU on success, NULL on failure
*/
static void *ocxlflash_create_afu(struct pci_dev *pdev)
{
struct device *dev = &pdev->dev;
struct ocxl_hw_afu *afu;
int rc;
afu = kzalloc(sizeof(*afu), GFP_KERNEL);
if (unlikely(!afu)) {
dev_err(dev, "%s: HW AFU allocation failed\n", __func__);
goto out;
}
afu->pdev = pdev;
afu->dev = dev;
rc = ocxlflash_config_fn(pdev, afu);
if (unlikely(rc)) {
dev_err(dev, "%s: Function configuration failed rc=%d\n",
__func__, rc);
goto err1;
}
out:
return afu;
err1:
kfree(afu);
afu = NULL;
goto out;
}
/* Backend ops to ocxlflash services */
const struct cxlflash_backend_ops cxlflash_ocxl_ops = {
.module = THIS_MODULE,
.create_afu = ocxlflash_create_afu,
.destroy_afu = ocxlflash_destroy_afu,
};
|
