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