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
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
// SPDX-License-Identifier: GPL-2.0+
// Copyright 2017 IBM Corp.
#include <linux/sysfs.h>
#include "ocxl_internal.h"
static inline struct ocxl_afu *to_afu(struct device *device)
{
struct ocxl_file_info *info = container_of(device, struct ocxl_file_info, dev);
return info->afu;
}
static ssize_t global_mmio_size_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct ocxl_afu *afu = to_afu(device);
return scnprintf(buf, PAGE_SIZE, "%d\n",
afu->config.global_mmio_size);
}
static ssize_t pp_mmio_size_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct ocxl_afu *afu = to_afu(device);
return scnprintf(buf, PAGE_SIZE, "%d\n",
afu->config.pp_mmio_stride);
}
static ssize_t afu_version_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct ocxl_afu *afu = to_afu(device);
return scnprintf(buf, PAGE_SIZE, "%hhu:%hhu\n",
afu->config.version_major,
afu->config.version_minor);
}
static ssize_t contexts_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct ocxl_afu *afu = to_afu(device);
return scnprintf(buf, PAGE_SIZE, "%d/%d\n",
afu->pasid_count, afu->pasid_max);
}
static struct device_attribute afu_attrs[] = {
__ATTR_RO(global_mmio_size),
__ATTR_RO(pp_mmio_size),
__ATTR_RO(afu_version),
__ATTR_RO(contexts),
};
static ssize_t global_mmio_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf,
loff_t off, size_t count)
{
struct ocxl_afu *afu = to_afu(kobj_to_dev(kobj));
if (count == 0 || off < 0 ||
off >= afu->config.global_mmio_size)
return 0;
memcpy_fromio(buf, afu->global_mmio_ptr + off, count);
return count;
}
static vm_fault_t global_mmio_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
struct ocxl_afu *afu = vma->vm_private_data;
unsigned long offset;
if (vmf->pgoff >= (afu->config.global_mmio_size >> PAGE_SHIFT))
return VM_FAULT_SIGBUS;
offset = vmf->pgoff;
offset += (afu->global_mmio_start >> PAGE_SHIFT);
return vmf_insert_pfn(vma, vmf->address, offset);
}
static const struct vm_operations_struct global_mmio_vmops = {
.fault = global_mmio_fault,
};
static int global_mmio_mmap(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr,
struct vm_area_struct *vma)
{
struct ocxl_afu *afu = to_afu(kobj_to_dev(kobj));
if ((vma_pages(vma) + vma->vm_pgoff) >
(afu->config.global_mmio_size >> PAGE_SHIFT))
return -EINVAL;
vma->vm_flags |= VM_IO | VM_PFNMAP;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
vma->vm_ops = &global_mmio_vmops;
vma->vm_private_data = afu;
return 0;
}
int ocxl_sysfs_register_afu(struct ocxl_file_info *info)
{
int i, rc;
for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) {
rc = device_create_file(&info->dev, &afu_attrs[i]);
if (rc)
goto err;
}
sysfs_attr_init(&info->attr_global_mmio.attr);
info->attr_global_mmio.attr.name = "global_mmio_area";
info->attr_global_mmio.attr.mode = 0600;
info->attr_global_mmio.size = info->afu->config.global_mmio_size;
info->attr_global_mmio.read = global_mmio_read;
info->attr_global_mmio.mmap = global_mmio_mmap;
rc = device_create_bin_file(&info->dev, &info->attr_global_mmio);
if (rc) {
dev_err(&info->dev, "Unable to create global mmio attr for afu: %d\n", rc);
goto err;
}
return 0;
err:
for (i--; i >= 0; i--)
device_remove_file(&info->dev, &afu_attrs[i]);
return rc;
}
void ocxl_sysfs_unregister_afu(struct ocxl_file_info *info)
{
int i;
/*
* device_remove_bin_file is safe to call if the file is not added as
* the files are removed by name, and early exit if not found
*/
for (i = 0; i < ARRAY_SIZE(afu_attrs); i++)
device_remove_file(&info->dev, &afu_attrs[i]);
device_remove_bin_file(&info->dev, &info->attr_global_mmio);
}
|
