1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | // Copyright 2017 IBM Corp. |
3 | #include <linux/sysfs.h> |
4 | #include "ocxl_internal.h" |
5 | |
6 | static inline struct ocxl_afu *to_afu(struct device *device) |
7 | { |
8 | struct ocxl_file_info *info = container_of(device, struct ocxl_file_info, dev); |
9 | |
10 | return info->afu; |
11 | } |
12 | |
13 | static ssize_t global_mmio_size_show(struct device *device, |
14 | struct device_attribute *attr, |
15 | char *buf) |
16 | { |
17 | struct ocxl_afu *afu = to_afu(device); |
18 | |
19 | return scnprintf(buf, PAGE_SIZE, fmt: "%d\n" , |
20 | afu->config.global_mmio_size); |
21 | } |
22 | |
23 | static ssize_t pp_mmio_size_show(struct device *device, |
24 | struct device_attribute *attr, |
25 | char *buf) |
26 | { |
27 | struct ocxl_afu *afu = to_afu(device); |
28 | |
29 | return scnprintf(buf, PAGE_SIZE, fmt: "%d\n" , |
30 | afu->config.pp_mmio_stride); |
31 | } |
32 | |
33 | static ssize_t afu_version_show(struct device *device, |
34 | struct device_attribute *attr, |
35 | char *buf) |
36 | { |
37 | struct ocxl_afu *afu = to_afu(device); |
38 | |
39 | return scnprintf(buf, PAGE_SIZE, fmt: "%hhu:%hhu\n" , |
40 | afu->config.version_major, |
41 | afu->config.version_minor); |
42 | } |
43 | |
44 | static ssize_t contexts_show(struct device *device, |
45 | struct device_attribute *attr, |
46 | char *buf) |
47 | { |
48 | struct ocxl_afu *afu = to_afu(device); |
49 | |
50 | return scnprintf(buf, PAGE_SIZE, fmt: "%d/%d\n" , |
51 | afu->pasid_count, afu->pasid_max); |
52 | } |
53 | |
54 | static ssize_t reload_on_reset_show(struct device *device, |
55 | struct device_attribute *attr, |
56 | char *buf) |
57 | { |
58 | struct ocxl_afu *afu = to_afu(device); |
59 | struct ocxl_fn *fn = afu->fn; |
60 | struct pci_dev *pci_dev = to_pci_dev(fn->dev.parent); |
61 | int val; |
62 | |
63 | if (ocxl_config_get_reset_reload(dev: pci_dev, val: &val)) |
64 | return scnprintf(buf, PAGE_SIZE, fmt: "unavailable\n" ); |
65 | |
66 | return scnprintf(buf, PAGE_SIZE, fmt: "%d\n" , val); |
67 | } |
68 | |
69 | static ssize_t reload_on_reset_store(struct device *device, |
70 | struct device_attribute *attr, |
71 | const char *buf, size_t count) |
72 | { |
73 | struct ocxl_afu *afu = to_afu(device); |
74 | struct ocxl_fn *fn = afu->fn; |
75 | struct pci_dev *pci_dev = to_pci_dev(fn->dev.parent); |
76 | int rc, val; |
77 | |
78 | rc = kstrtoint(s: buf, base: 0, res: &val); |
79 | if (rc || (val != 0 && val != 1)) |
80 | return -EINVAL; |
81 | |
82 | if (ocxl_config_set_reset_reload(dev: pci_dev, val)) |
83 | return -ENODEV; |
84 | |
85 | return count; |
86 | } |
87 | |
88 | static struct device_attribute afu_attrs[] = { |
89 | __ATTR_RO(global_mmio_size), |
90 | __ATTR_RO(pp_mmio_size), |
91 | __ATTR_RO(afu_version), |
92 | __ATTR_RO(contexts), |
93 | __ATTR_RW(reload_on_reset), |
94 | }; |
95 | |
96 | static ssize_t global_mmio_read(struct file *filp, struct kobject *kobj, |
97 | struct bin_attribute *bin_attr, char *buf, |
98 | loff_t off, size_t count) |
99 | { |
100 | struct ocxl_afu *afu = to_afu(kobj_to_dev(kobj)); |
101 | |
102 | if (count == 0 || off < 0 || |
103 | off >= afu->config.global_mmio_size) |
104 | return 0; |
105 | memcpy_fromio(buf, afu->global_mmio_ptr + off, count); |
106 | return count; |
107 | } |
108 | |
109 | static vm_fault_t global_mmio_fault(struct vm_fault *vmf) |
110 | { |
111 | struct vm_area_struct *vma = vmf->vma; |
112 | struct ocxl_afu *afu = vma->vm_private_data; |
113 | unsigned long offset; |
114 | |
115 | if (vmf->pgoff >= (afu->config.global_mmio_size >> PAGE_SHIFT)) |
116 | return VM_FAULT_SIGBUS; |
117 | |
118 | offset = vmf->pgoff; |
119 | offset += (afu->global_mmio_start >> PAGE_SHIFT); |
120 | return vmf_insert_pfn(vma, addr: vmf->address, pfn: offset); |
121 | } |
122 | |
123 | static const struct vm_operations_struct global_mmio_vmops = { |
124 | .fault = global_mmio_fault, |
125 | }; |
126 | |
127 | static int global_mmio_mmap(struct file *filp, struct kobject *kobj, |
128 | struct bin_attribute *bin_attr, |
129 | struct vm_area_struct *vma) |
130 | { |
131 | struct ocxl_afu *afu = to_afu(kobj_to_dev(kobj)); |
132 | |
133 | if ((vma_pages(vma) + vma->vm_pgoff) > |
134 | (afu->config.global_mmio_size >> PAGE_SHIFT)) |
135 | return -EINVAL; |
136 | |
137 | vm_flags_set(vma, VM_IO | VM_PFNMAP); |
138 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
139 | vma->vm_ops = &global_mmio_vmops; |
140 | vma->vm_private_data = afu; |
141 | return 0; |
142 | } |
143 | |
144 | int ocxl_sysfs_register_afu(struct ocxl_file_info *info) |
145 | { |
146 | int i, rc; |
147 | |
148 | for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) { |
149 | rc = device_create_file(device: &info->dev, entry: &afu_attrs[i]); |
150 | if (rc) |
151 | goto err; |
152 | } |
153 | |
154 | sysfs_attr_init(&info->attr_global_mmio.attr); |
155 | info->attr_global_mmio.attr.name = "global_mmio_area" ; |
156 | info->attr_global_mmio.attr.mode = 0600; |
157 | info->attr_global_mmio.size = info->afu->config.global_mmio_size; |
158 | info->attr_global_mmio.read = global_mmio_read; |
159 | info->attr_global_mmio.mmap = global_mmio_mmap; |
160 | rc = device_create_bin_file(dev: &info->dev, attr: &info->attr_global_mmio); |
161 | if (rc) { |
162 | dev_err(&info->dev, "Unable to create global mmio attr for afu: %d\n" , rc); |
163 | goto err; |
164 | } |
165 | |
166 | return 0; |
167 | |
168 | err: |
169 | for (i--; i >= 0; i--) |
170 | device_remove_file(dev: &info->dev, attr: &afu_attrs[i]); |
171 | |
172 | return rc; |
173 | } |
174 | |
175 | void ocxl_sysfs_unregister_afu(struct ocxl_file_info *info) |
176 | { |
177 | int i; |
178 | |
179 | /* |
180 | * device_remove_bin_file is safe to call if the file is not added as |
181 | * the files are removed by name, and early exit if not found |
182 | */ |
183 | for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) |
184 | device_remove_file(dev: &info->dev, attr: &afu_attrs[i]); |
185 | device_remove_bin_file(dev: &info->dev, attr: &info->attr_global_mmio); |
186 | } |
187 | |