1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Qualcomm Technologies HIDMA Management SYS interface |
4 | * |
5 | * Copyright (c) 2015, The Linux Foundation. All rights reserved. |
6 | */ |
7 | |
8 | #include <linux/sysfs.h> |
9 | #include <linux/platform_device.h> |
10 | |
11 | #include "hidma_mgmt.h" |
12 | |
13 | struct hidma_chan_attr { |
14 | struct hidma_mgmt_dev *mdev; |
15 | int index; |
16 | struct kobj_attribute attr; |
17 | }; |
18 | |
19 | struct hidma_mgmt_fileinfo { |
20 | char *name; |
21 | int mode; |
22 | int (*get)(struct hidma_mgmt_dev *mdev); |
23 | int (*set)(struct hidma_mgmt_dev *mdev, u64 val); |
24 | }; |
25 | |
26 | #define IMPLEMENT_GETSET(name) \ |
27 | static int get_##name(struct hidma_mgmt_dev *mdev) \ |
28 | { \ |
29 | return mdev->name; \ |
30 | } \ |
31 | static int set_##name(struct hidma_mgmt_dev *mdev, u64 val) \ |
32 | { \ |
33 | u64 tmp; \ |
34 | int rc; \ |
35 | \ |
36 | tmp = mdev->name; \ |
37 | mdev->name = val; \ |
38 | rc = hidma_mgmt_setup(mdev); \ |
39 | if (rc) \ |
40 | mdev->name = tmp; \ |
41 | return rc; \ |
42 | } |
43 | |
44 | #define DECLARE_ATTRIBUTE(name, mode) \ |
45 | {#name, mode, get_##name, set_##name} |
46 | |
47 | IMPLEMENT_GETSET(hw_version_major) |
48 | IMPLEMENT_GETSET(hw_version_minor) |
49 | IMPLEMENT_GETSET(max_wr_xactions) |
50 | IMPLEMENT_GETSET(max_rd_xactions) |
51 | IMPLEMENT_GETSET(max_write_request) |
52 | IMPLEMENT_GETSET(max_read_request) |
53 | IMPLEMENT_GETSET(dma_channels) |
54 | IMPLEMENT_GETSET(chreset_timeout_cycles) |
55 | |
56 | static int set_priority(struct hidma_mgmt_dev *mdev, unsigned int i, u64 val) |
57 | { |
58 | u64 tmp; |
59 | int rc; |
60 | |
61 | if (i >= mdev->dma_channels) |
62 | return -EINVAL; |
63 | |
64 | tmp = mdev->priority[i]; |
65 | mdev->priority[i] = val; |
66 | rc = hidma_mgmt_setup(mgmtdev: mdev); |
67 | if (rc) |
68 | mdev->priority[i] = tmp; |
69 | return rc; |
70 | } |
71 | |
72 | static int set_weight(struct hidma_mgmt_dev *mdev, unsigned int i, u64 val) |
73 | { |
74 | u64 tmp; |
75 | int rc; |
76 | |
77 | if (i >= mdev->dma_channels) |
78 | return -EINVAL; |
79 | |
80 | tmp = mdev->weight[i]; |
81 | mdev->weight[i] = val; |
82 | rc = hidma_mgmt_setup(mgmtdev: mdev); |
83 | if (rc) |
84 | mdev->weight[i] = tmp; |
85 | return rc; |
86 | } |
87 | |
88 | static struct hidma_mgmt_fileinfo hidma_mgmt_files[] = { |
89 | DECLARE_ATTRIBUTE(hw_version_major, S_IRUGO), |
90 | DECLARE_ATTRIBUTE(hw_version_minor, S_IRUGO), |
91 | DECLARE_ATTRIBUTE(dma_channels, S_IRUGO), |
92 | DECLARE_ATTRIBUTE(chreset_timeout_cycles, S_IRUGO), |
93 | DECLARE_ATTRIBUTE(max_wr_xactions, S_IRUGO), |
94 | DECLARE_ATTRIBUTE(max_rd_xactions, S_IRUGO), |
95 | DECLARE_ATTRIBUTE(max_write_request, S_IRUGO), |
96 | DECLARE_ATTRIBUTE(max_read_request, S_IRUGO), |
97 | }; |
98 | |
99 | static ssize_t show_values(struct device *dev, struct device_attribute *attr, |
100 | char *buf) |
101 | { |
102 | struct hidma_mgmt_dev *mdev = dev_get_drvdata(dev); |
103 | unsigned int i; |
104 | |
105 | buf[0] = 0; |
106 | |
107 | for (i = 0; i < ARRAY_SIZE(hidma_mgmt_files); i++) { |
108 | if (strcmp(attr->attr.name, hidma_mgmt_files[i].name) == 0) { |
109 | sprintf(buf, fmt: "%d\n" , hidma_mgmt_files[i].get(mdev)); |
110 | break; |
111 | } |
112 | } |
113 | return strlen(buf); |
114 | } |
115 | |
116 | static ssize_t set_values(struct device *dev, struct device_attribute *attr, |
117 | const char *buf, size_t count) |
118 | { |
119 | struct hidma_mgmt_dev *mdev = dev_get_drvdata(dev); |
120 | unsigned long tmp; |
121 | unsigned int i; |
122 | int rc; |
123 | |
124 | rc = kstrtoul(s: buf, base: 0, res: &tmp); |
125 | if (rc) |
126 | return rc; |
127 | |
128 | for (i = 0; i < ARRAY_SIZE(hidma_mgmt_files); i++) { |
129 | if (strcmp(attr->attr.name, hidma_mgmt_files[i].name) == 0) { |
130 | rc = hidma_mgmt_files[i].set(mdev, tmp); |
131 | if (rc) |
132 | return rc; |
133 | |
134 | break; |
135 | } |
136 | } |
137 | return count; |
138 | } |
139 | |
140 | static ssize_t show_values_channel(struct kobject *kobj, |
141 | struct kobj_attribute *attr, char *buf) |
142 | { |
143 | struct hidma_chan_attr *chattr; |
144 | struct hidma_mgmt_dev *mdev; |
145 | |
146 | buf[0] = 0; |
147 | chattr = container_of(attr, struct hidma_chan_attr, attr); |
148 | mdev = chattr->mdev; |
149 | if (strcmp(attr->attr.name, "priority" ) == 0) |
150 | sprintf(buf, fmt: "%d\n" , mdev->priority[chattr->index]); |
151 | else if (strcmp(attr->attr.name, "weight" ) == 0) |
152 | sprintf(buf, fmt: "%d\n" , mdev->weight[chattr->index]); |
153 | |
154 | return strlen(buf); |
155 | } |
156 | |
157 | static ssize_t set_values_channel(struct kobject *kobj, |
158 | struct kobj_attribute *attr, const char *buf, |
159 | size_t count) |
160 | { |
161 | struct hidma_chan_attr *chattr; |
162 | struct hidma_mgmt_dev *mdev; |
163 | unsigned long tmp; |
164 | int rc; |
165 | |
166 | chattr = container_of(attr, struct hidma_chan_attr, attr); |
167 | mdev = chattr->mdev; |
168 | |
169 | rc = kstrtoul(s: buf, base: 0, res: &tmp); |
170 | if (rc) |
171 | return rc; |
172 | |
173 | if (strcmp(attr->attr.name, "priority" ) == 0) { |
174 | rc = set_priority(mdev, i: chattr->index, val: tmp); |
175 | if (rc) |
176 | return rc; |
177 | } else if (strcmp(attr->attr.name, "weight" ) == 0) { |
178 | rc = set_weight(mdev, i: chattr->index, val: tmp); |
179 | if (rc) |
180 | return rc; |
181 | } |
182 | return count; |
183 | } |
184 | |
185 | static int create_sysfs_entry(struct hidma_mgmt_dev *dev, char *name, int mode) |
186 | { |
187 | struct device_attribute *attrs; |
188 | char *name_copy; |
189 | |
190 | attrs = devm_kmalloc(dev: &dev->pdev->dev, |
191 | size: sizeof(struct device_attribute), GFP_KERNEL); |
192 | if (!attrs) |
193 | return -ENOMEM; |
194 | |
195 | name_copy = devm_kstrdup(dev: &dev->pdev->dev, s: name, GFP_KERNEL); |
196 | if (!name_copy) |
197 | return -ENOMEM; |
198 | |
199 | attrs->attr.name = name_copy; |
200 | attrs->attr.mode = mode; |
201 | attrs->show = show_values; |
202 | attrs->store = set_values; |
203 | sysfs_attr_init(&attrs->attr); |
204 | |
205 | return device_create_file(device: &dev->pdev->dev, entry: attrs); |
206 | } |
207 | |
208 | static int create_sysfs_entry_channel(struct hidma_mgmt_dev *mdev, char *name, |
209 | int mode, int index, |
210 | struct kobject *parent) |
211 | { |
212 | struct hidma_chan_attr *chattr; |
213 | char *name_copy; |
214 | |
215 | chattr = devm_kmalloc(dev: &mdev->pdev->dev, size: sizeof(*chattr), GFP_KERNEL); |
216 | if (!chattr) |
217 | return -ENOMEM; |
218 | |
219 | name_copy = devm_kstrdup(dev: &mdev->pdev->dev, s: name, GFP_KERNEL); |
220 | if (!name_copy) |
221 | return -ENOMEM; |
222 | |
223 | chattr->mdev = mdev; |
224 | chattr->index = index; |
225 | chattr->attr.attr.name = name_copy; |
226 | chattr->attr.attr.mode = mode; |
227 | chattr->attr.show = show_values_channel; |
228 | chattr->attr.store = set_values_channel; |
229 | sysfs_attr_init(&chattr->attr.attr); |
230 | |
231 | return sysfs_create_file(kobj: parent, attr: &chattr->attr.attr); |
232 | } |
233 | |
234 | int hidma_mgmt_init_sys(struct hidma_mgmt_dev *mdev) |
235 | { |
236 | unsigned int i; |
237 | int rc; |
238 | int required; |
239 | struct kobject *chanops; |
240 | |
241 | required = sizeof(*mdev->chroots) * mdev->dma_channels; |
242 | mdev->chroots = devm_kmalloc(dev: &mdev->pdev->dev, size: required, GFP_KERNEL); |
243 | if (!mdev->chroots) |
244 | return -ENOMEM; |
245 | |
246 | chanops = kobject_create_and_add(name: "chanops" , parent: &mdev->pdev->dev.kobj); |
247 | if (!chanops) |
248 | return -ENOMEM; |
249 | |
250 | /* create each channel directory here */ |
251 | for (i = 0; i < mdev->dma_channels; i++) { |
252 | char name[20]; |
253 | |
254 | snprintf(buf: name, size: sizeof(name), fmt: "chan%d" , i); |
255 | mdev->chroots[i] = kobject_create_and_add(name, parent: chanops); |
256 | if (!mdev->chroots[i]) |
257 | return -ENOMEM; |
258 | } |
259 | |
260 | /* populate common parameters */ |
261 | for (i = 0; i < ARRAY_SIZE(hidma_mgmt_files); i++) { |
262 | rc = create_sysfs_entry(dev: mdev, name: hidma_mgmt_files[i].name, |
263 | mode: hidma_mgmt_files[i].mode); |
264 | if (rc) |
265 | return rc; |
266 | } |
267 | |
268 | /* populate parameters that are per channel */ |
269 | for (i = 0; i < mdev->dma_channels; i++) { |
270 | rc = create_sysfs_entry_channel(mdev, name: "priority" , |
271 | mode: (S_IRUGO | S_IWUGO), index: i, |
272 | parent: mdev->chroots[i]); |
273 | if (rc) |
274 | return rc; |
275 | |
276 | rc = create_sysfs_entry_channel(mdev, name: "weight" , |
277 | mode: (S_IRUGO | S_IWUGO), index: i, |
278 | parent: mdev->chroots[i]); |
279 | if (rc) |
280 | return rc; |
281 | } |
282 | |
283 | return 0; |
284 | } |
285 | EXPORT_SYMBOL_GPL(hidma_mgmt_init_sys); |
286 | |