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