1
2
3#include <linux/sysfs.h>
4#include "ocxl_internal.h"
5
6static ssize_t global_mmio_size_show(struct device *device,
7 struct device_attribute *attr,
8 char *buf)
9{
10 struct ocxl_afu *afu = to_ocxl_afu(device);
11
12 return scnprintf(buf, PAGE_SIZE, "%d\n",
13 afu->config.global_mmio_size);
14}
15
16static ssize_t pp_mmio_size_show(struct device *device,
17 struct device_attribute *attr,
18 char *buf)
19{
20 struct ocxl_afu *afu = to_ocxl_afu(device);
21
22 return scnprintf(buf, PAGE_SIZE, "%d\n",
23 afu->config.pp_mmio_stride);
24}
25
26static ssize_t afu_version_show(struct device *device,
27 struct device_attribute *attr,
28 char *buf)
29{
30 struct ocxl_afu *afu = to_ocxl_afu(device);
31
32 return scnprintf(buf, PAGE_SIZE, "%hhu:%hhu\n",
33 afu->config.version_major,
34 afu->config.version_minor);
35}
36
37static ssize_t contexts_show(struct device *device,
38 struct device_attribute *attr,
39 char *buf)
40{
41 struct ocxl_afu *afu = to_ocxl_afu(device);
42
43 return scnprintf(buf, PAGE_SIZE, "%d/%d\n",
44 afu->pasid_count, afu->pasid_max);
45}
46
47static struct device_attribute afu_attrs[] = {
48 __ATTR_RO(global_mmio_size),
49 __ATTR_RO(pp_mmio_size),
50 __ATTR_RO(afu_version),
51 __ATTR_RO(contexts),
52};
53
54static ssize_t global_mmio_read(struct file *filp, struct kobject *kobj,
55 struct bin_attribute *bin_attr, char *buf,
56 loff_t off, size_t count)
57{
58 struct ocxl_afu *afu = to_ocxl_afu(kobj_to_dev(kobj));
59
60 if (count == 0 || off < 0 ||
61 off >= afu->config.global_mmio_size)
62 return 0;
63 memcpy_fromio(buf, afu->global_mmio_ptr + off, count);
64 return count;
65}
66
67static int global_mmio_fault(struct vm_fault *vmf)
68{
69 struct vm_area_struct *vma = vmf->vma;
70 struct ocxl_afu *afu = vma->vm_private_data;
71 unsigned long offset;
72
73 if (vmf->pgoff >= (afu->config.global_mmio_size >> PAGE_SHIFT))
74 return VM_FAULT_SIGBUS;
75
76 offset = vmf->pgoff;
77 offset += (afu->global_mmio_start >> PAGE_SHIFT);
78 vm_insert_pfn(vma, vmf->address, offset);
79 return VM_FAULT_NOPAGE;
80}
81
82static const struct vm_operations_struct global_mmio_vmops = {
83 .fault = global_mmio_fault,
84};
85
86static int global_mmio_mmap(struct file *filp, struct kobject *kobj,
87 struct bin_attribute *bin_attr,
88 struct vm_area_struct *vma)
89{
90 struct ocxl_afu *afu = to_ocxl_afu(kobj_to_dev(kobj));
91
92 if ((vma_pages(vma) + vma->vm_pgoff) >
93 (afu->config.global_mmio_size >> PAGE_SHIFT))
94 return -EINVAL;
95
96 vma->vm_flags |= VM_IO | VM_PFNMAP;
97 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
98 vma->vm_ops = &global_mmio_vmops;
99 vma->vm_private_data = afu;
100 return 0;
101}
102
103int ocxl_sysfs_add_afu(struct ocxl_afu *afu)
104{
105 int i, rc;
106
107 for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) {
108 rc = device_create_file(&afu->dev, &afu_attrs[i]);
109 if (rc)
110 goto err;
111 }
112
113 sysfs_attr_init(&afu->attr_global_mmio.attr);
114 afu->attr_global_mmio.attr.name = "global_mmio_area";
115 afu->attr_global_mmio.attr.mode = 0600;
116 afu->attr_global_mmio.size = afu->config.global_mmio_size;
117 afu->attr_global_mmio.read = global_mmio_read;
118 afu->attr_global_mmio.mmap = global_mmio_mmap;
119 rc = device_create_bin_file(&afu->dev, &afu->attr_global_mmio);
120 if (rc) {
121 dev_err(&afu->dev,
122 "Unable to create global mmio attr for afu: %d\n",
123 rc);
124 goto err;
125 }
126
127 return 0;
128
129err:
130 for (i--; i >= 0; i--)
131 device_remove_file(&afu->dev, &afu_attrs[i]);
132 return rc;
133}
134
135void ocxl_sysfs_remove_afu(struct ocxl_afu *afu)
136{
137 int i;
138
139 for (i = 0; i < ARRAY_SIZE(afu_attrs); i++)
140 device_remove_file(&afu->dev, &afu_attrs[i]);
141 device_remove_bin_file(&afu->dev, &afu->attr_global_mmio);
142}
143
