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1802d0be | 1 | // SPDX-License-Identifier: GPL-2.0-only |
2aefbef0 MR |
2 | /* |
3 | * Remote Processor Framework | |
2aefbef0 MR |
4 | */ |
5 | ||
6 | #include <linux/remoteproc.h> | |
bf89a7c0 | 7 | #include <linux/slab.h> |
2aefbef0 MR |
8 | |
9 | #include "remoteproc_internal.h" | |
10 | ||
11 | #define to_rproc(d) container_of(d, struct rproc, dev) | |
12 | ||
13 | /* Expose the loaded / running firmware name via sysfs */ | |
14 | static ssize_t firmware_show(struct device *dev, struct device_attribute *attr, | |
15 | char *buf) | |
16 | { | |
17 | struct rproc *rproc = to_rproc(dev); | |
18 | ||
19 | return sprintf(buf, "%s\n", rproc->firmware); | |
20 | } | |
21 | ||
22 | /* Change firmware name via sysfs */ | |
23 | static ssize_t firmware_store(struct device *dev, | |
24 | struct device_attribute *attr, | |
25 | const char *buf, size_t count) | |
26 | { | |
27 | struct rproc *rproc = to_rproc(dev); | |
28 | char *p; | |
29 | int err, len = count; | |
30 | ||
31 | err = mutex_lock_interruptible(&rproc->lock); | |
32 | if (err) { | |
33 | dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, err); | |
34 | return -EINVAL; | |
35 | } | |
36 | ||
37 | if (rproc->state != RPROC_OFFLINE) { | |
38 | dev_err(dev, "can't change firmware while running\n"); | |
39 | err = -EBUSY; | |
40 | goto out; | |
41 | } | |
42 | ||
43 | len = strcspn(buf, "\n"); | |
faeadbb6 SA |
44 | if (!len) { |
45 | dev_err(dev, "can't provide a NULL firmware\n"); | |
46 | err = -EINVAL; | |
47 | goto out; | |
48 | } | |
2aefbef0 MR |
49 | |
50 | p = kstrndup(buf, len, GFP_KERNEL); | |
51 | if (!p) { | |
52 | err = -ENOMEM; | |
53 | goto out; | |
54 | } | |
55 | ||
56 | kfree(rproc->firmware); | |
57 | rproc->firmware = p; | |
58 | out: | |
59 | mutex_unlock(&rproc->lock); | |
60 | ||
61 | return err ? err : count; | |
62 | } | |
63 | static DEVICE_ATTR_RW(firmware); | |
64 | ||
65 | /* | |
66 | * A state-to-string lookup table, for exposing a human readable state | |
67 | * via sysfs. Always keep in sync with enum rproc_state | |
68 | */ | |
69 | static const char * const rproc_state_string[] = { | |
70 | [RPROC_OFFLINE] = "offline", | |
71 | [RPROC_SUSPENDED] = "suspended", | |
72 | [RPROC_RUNNING] = "running", | |
73 | [RPROC_CRASHED] = "crashed", | |
608d7921 | 74 | [RPROC_DELETED] = "deleted", |
2aefbef0 MR |
75 | [RPROC_LAST] = "invalid", |
76 | }; | |
77 | ||
78 | /* Expose the state of the remote processor via sysfs */ | |
79 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, | |
80 | char *buf) | |
81 | { | |
82 | struct rproc *rproc = to_rproc(dev); | |
83 | unsigned int state; | |
84 | ||
85 | state = rproc->state > RPROC_LAST ? RPROC_LAST : rproc->state; | |
86 | return sprintf(buf, "%s\n", rproc_state_string[state]); | |
87 | } | |
88 | ||
89 | /* Change remote processor state via sysfs */ | |
90 | static ssize_t state_store(struct device *dev, | |
91 | struct device_attribute *attr, | |
92 | const char *buf, size_t count) | |
93 | { | |
94 | struct rproc *rproc = to_rproc(dev); | |
95 | int ret = 0; | |
96 | ||
97 | if (sysfs_streq(buf, "start")) { | |
98 | if (rproc->state == RPROC_RUNNING) | |
99 | return -EBUSY; | |
100 | ||
101 | ret = rproc_boot(rproc); | |
102 | if (ret) | |
103 | dev_err(&rproc->dev, "Boot failed: %d\n", ret); | |
104 | } else if (sysfs_streq(buf, "stop")) { | |
105 | if (rproc->state != RPROC_RUNNING) | |
106 | return -EINVAL; | |
107 | ||
108 | rproc_shutdown(rproc); | |
109 | } else { | |
110 | dev_err(&rproc->dev, "Unrecognised option: %s\n", buf); | |
111 | ret = -EINVAL; | |
112 | } | |
113 | return ret ? ret : count; | |
114 | } | |
115 | static DEVICE_ATTR_RW(state); | |
116 | ||
6ed756aa SA |
117 | /* Expose the name of the remote processor via sysfs */ |
118 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, | |
119 | char *buf) | |
120 | { | |
121 | struct rproc *rproc = to_rproc(dev); | |
122 | ||
123 | return sprintf(buf, "%s\n", rproc->name); | |
124 | } | |
125 | static DEVICE_ATTR_RO(name); | |
126 | ||
2aefbef0 MR |
127 | static struct attribute *rproc_attrs[] = { |
128 | &dev_attr_firmware.attr, | |
129 | &dev_attr_state.attr, | |
6ed756aa | 130 | &dev_attr_name.attr, |
2aefbef0 MR |
131 | NULL |
132 | }; | |
133 | ||
134 | static const struct attribute_group rproc_devgroup = { | |
135 | .attrs = rproc_attrs | |
136 | }; | |
137 | ||
138 | static const struct attribute_group *rproc_devgroups[] = { | |
139 | &rproc_devgroup, | |
140 | NULL | |
141 | }; | |
142 | ||
143 | struct class rproc_class = { | |
144 | .name = "remoteproc", | |
145 | .dev_groups = rproc_devgroups, | |
146 | }; | |
147 | ||
148 | int __init rproc_init_sysfs(void) | |
149 | { | |
150 | /* create remoteproc device class for sysfs */ | |
151 | int err = class_register(&rproc_class); | |
152 | ||
153 | if (err) | |
154 | pr_err("remoteproc: unable to register class\n"); | |
155 | return err; | |
156 | } | |
157 | ||
158 | void __exit rproc_exit_sysfs(void) | |
159 | { | |
160 | class_unregister(&rproc_class); | |
161 | } |